AU593463B2 - Creation of Inventions and Patents with Artificial Intelligence

AU593463B2 – Steam-trap operation monitor
– Google Patents

AU593463B2 – Steam-trap operation monitor
– Google Patents
Steam-trap operation monitor

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Publication number
AU593463B2

AU593463B2
AU12441/88A
AU1244188A
AU593463B2
AU 593463 B2
AU593463 B2
AU 593463B2
AU 12441/88 A
AU12441/88 A
AU 12441/88A
AU 1244188 A
AU1244188 A
AU 1244188A
AU 593463 B2
AU593463 B2
AU 593463B2
Authority
AU
Australia
Prior art keywords
steam
detected
vibration
probe
detection
Prior art date
1987-02-09
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Ceased

Application number
AU12441/88A
Other versions

AU1244188A
(en

Inventor
Yoshiyasu Fujiwara
Yasutoshi Hosokawa
Mamoru Nagase
Masakatsu Okamoto
Yoshito Yamada
Masao Yonemura
Hideaki Yumoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

TLV Co Ltd

Original Assignee
TLV Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1987-02-09
Filing date
1988-02-08
Publication date
1990-02-08
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First worldwide family litigation filed
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https://patents.darts-ip.com/?family=27571473&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=AU593463(B2)
“Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.

1987-02-09
Priority claimed from JP62029164A
external-priority
patent/JPS63195498A/en

1987-09-14
Priority claimed from JP62230821A
external-priority
patent/JPS6474397A/en

1988-01-12
Priority claimed from JP275888U
external-priority
patent/JPH056501Y2/ja

1988-01-13
Priority claimed from JP1988003334U
external-priority
patent/JPH01107934U/ja

1988-01-13
Priority claimed from JP1988003333U
external-priority
patent/JPH0524192Y2/ja

1988-01-13
Priority claimed from JP1988003335U
external-priority
patent/JPH01107936U/ja

1988-01-14
Priority claimed from JP63006648A
external-priority
patent/JPH01182724A/en

1988-01-14
Priority claimed from JP63006649A
external-priority
patent/JPH06100319B2/en

1988-02-08
Application filed by TLV Co Ltd
filed
Critical
TLV Co Ltd

1988-08-24
Publication of AU1244188A
publication
Critical
patent/AU1244188A/en

1990-02-08
Publication of AU593463B2
publication
Critical
patent/AU593463B2/en

1990-02-08
Application granted
granted
Critical

2008-02-08
Anticipated expiration
legal-status
Critical

Status
Ceased
legal-status
Critical
Current

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Classifications

F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL

F16T—STEAM TRAPS OR LIKE APPARATUS FOR DRAINING-OFF LIQUIDS FROM ENCLOSURES PREDOMINANTLY CONTAINING GASES OR VAPOURS

F16T1/00—Steam traps or like apparatus for draining-off liquids from enclosures predominantly containing gases or vapours, e.g. gas lines, steam lines, containers

F16T1/38—Component parts; Accessories

F16T1/48—Monitoring arrangements for inspecting, e.g. flow of steam and steam condensate

Abstract

The operation sensor of a steam trap is used for judging the operating condition of a steam trap used in various installations using a steam and consists of an oscillation detection portion (1) and an operation processing portion (50) for operation processing the signals detected by the oscillation detection portion and outputting the results. The detection portion (1) includes a detection needle (2) brought into contact with an object of detection at a predetermined pressure urged by a flexible member and detecting mechanical oscillation of the detection object resulting from the steam flow and condensation flow in the object, an oscillation plate (21) for generating ultrasonic oscillation by the mechanical oscillation detected by the detection needle (2), an oscillation sensor (16) disposed so as to oppose the oscillation plate (21) and converting the ultrasonic oscillation to an electrical signal and a circuit substrate (20) including an amplification circuit for suitably amplifying the output from the oscillation sensor (16) and transmitting it to the outside. The operation processing portion (50) includes memory (M) for storing data corresponding to steam traps of various types inclusive of the detection object, a central processing unit (CPU) for performing operation by comparing the output of the detection portion transmitted from the detection portion (1) with predetermined data obtained selectively from the stored data of memory (M) and output portions (D; S) for displaying the result of operation by the central processing unit (CPU) and/or generating an audible output with an audio frequency. The operation sensor includes a temperature sensor (10) added to the tip of the detection needle (2) of the detection portion and can detect the temperature and/or steam pressure of the detection object. Accordingly, the operating condition of the steam trap can be judged more accurately.

Description

PCT *MCT W44,” AU-Al-12441/88 Z f D Pr,41W F I6T 1/48, GO1 fIf 1/08, 11/06 Al m 1 )8/58 Al 4) S~~ (21) ff[fifi4J (22) RIMW El (31 fft*# Po’r/Jr?88/oo 118 19884F-2)18E) (08. 02. 88) ‘~UIW0 6 2- 2 916 4 ‘t.Uflfli63- 6648 “..W663- 6649 -fifl 6 3 2758 U A011663 -3333 U VTP~ii 6 3- 3334 U ;ftil 6 3- 3335 U 19 8 7/p-2l9 E (09. 02. 87) 19 8 71’P9A14 E (14. 09. 87) 19 881IA14EA 14. 01. 88) 19 88,,0FA14 0 14. 01. 88) 1988*IAEJ12F1 (12. 01. 88) 19 8 8I-JI k- E 13. 01. 88) 19 8 8,Fl 1 3 E (13. 01. 88) 19 8 84F-1.i13 FI(13. 01. 88.) (72) 309 iJ 04511J I (YUMOTO, Ilid eaki )(CJP/JP) (YONEMURA. Masa o CJP/J P (NAGASE, Mama rit)(P/JP) (YAMADA, Yoshi to)CJP/JP) (FUZ1WARA, Yo s IlIy as it) JP/JP I (OKAMOTO, Mas .1ka t si) (Jl/J?) (H-OSOKAWA, Yas ut o sh I) CJ P/JP) (32) ff!%E f675 ifI )liJiiiJliaq 88 14 J-lJl± EilYPT-, AI(ESAKI, Mi tsuyoslii et al.) 71 05 iifiii /U]2 TO 8 *4’~1fl- C1″11. A Tokyo, (JP) (81 Ibtg A T AflilYRT, A U, B31E RilY-Pr1~ B R, OH1- NJ&HI’r-) 1) B (iRJMY1′, DK, F 1, F It( 09’JfflVr 0113 (V~WqVr), IT (iR i1*r), KR, LU (8i0’1*i’r, N LCR(iii*)W), NO.
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AT.O.J. 2 29 SEP 1988 R1ki A-576- (TLV LTD. )CJP/JP) 767 5 I’14)Fi1UTff’ y ago, (JP) (54) Title: OPERATION SENSOR OF STEAM TRAP (57) Abstract The operation sensor of a steam trap is used for judging the operating condition of a steam trap used in various installations using a steam and consists of an oscillation detection portion and an operation processing portion (50) for operation processing the signals detected by the oscillation detection portion and outputing the results. The detection portion includes a detection needle brought into contact with an object of detection at a predetermined pressure urged by a flexible member and detecting mechanical oscillation of the detection object resulting from the steam flow and condensation flow in the object, an oscillation plate (21) for generating ultrasonic oscillation by the mechanical oscillation detected by the detection needle an oscillation sensor (16) disposed so as to oppose the oscillation plate (21) and converting the ultrasonic oscillation to an electrical signal and a circuit substrate (20) including an amplification circuit for suitably amplifying ‘he output from the oscillation sensor (16) and transmitting it to the outside. Thle operation processing portion (50) includes memory for storing data corresponding to steam traps of various types inclusive of the detection object, a central processing unit (CPU) for performing operation by comparing the output of the detection portion transmitted from the detection portion with predetermnied data obtained selectively from the stored data of memory and output portions S) for displaying the result of operation by thle central processing unit (CPU) and/or generating an audible output wi th an audio frequency. The operaivon sensor includes a temperature sensor (10) added to the tip of the detection needle of (fhe detection portion and can detect the temperature and/or steam pressure of the detection object. Accordingly, the operating condition of the steam trap can be judged more accurately.
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DESCRIPTION
STEAM TRAP OPERATION DE’rECTOR FIELD OF THE INVENTION The present invention relates to operation detectors for judging whether the operating condition of steam traps used in steam systems at steam appliances, such as a steam-motive electric power plant, a chemical plant, a manufacturing equipment, and the like, is good or not.
BACKGROUND TECHNIQUES Generally, steam traps are provided at suitable places of steam lines or steam appliances for the purpose of automatically exhausting condensed water without passing steam. In the case where such steam traps do not operate normally, there will occur a serious trouble in the activities of steam appliances by failure of steam transportation or by occurrence of steam loss. More particularly, in the case where the exhaust capacity of steam traps attached to steam appliances is less than the quantity of condensed water, or in the case where the condensed-water exhausting function of steam traps deteriorates or is lost so entirely that the valve opening function thereof can not operate, the condensed water will remain in the entrance piping of the steam traps, so that a phenomenon of water hammer will often appear or the efficiency of the steam appliances will be often lowered to cause breakage in extreme case.
On the contrary, in the case where the valve closing function of the steam traps is unsatisfactory, it will be apparent that steam leakage increases to thereby cause inconvenience of lowering of efficiency with the shortage in pressure and quantity of the steam and to thereby cause waste of expensive energy undesirably.
i: 2– As an example of apparatus for detecting steam leakage at a steam valve such as a steam trap or the like, a steam leakage detector has been disclosed in Japanese Utility Model Unexamined Publication No. 58-187739. The steam leakage detector detects vibration in a valve body of a steam valve from the outside of the steam valve to thereby judge presence of steam leakage.
The principle of detection in the steam leakage detector is in that a probe provided at the top end of the detector is brought into contact with the steam valve or the like to be detected so that vibration generated in the probe is converted into an electric signal by an ultrasonic microphone using a piezoelectric element, and then the electric signal is amplified and led to a display unit or a speaker to drive the display unit or the speaker.
According to this prior art apparatus, deflection of an indication pointer actuated by the vibration detected by the probe is read or sound from the speaker is listen to recognize the level of vibration, and hence the presence and degree of steam leakage. However, the apparatus has a disadvantage in that steam leakage can not be grasped quantitatively. This is because vibration generated in a valve, such as a steam trap or the like, varies widely with various factors, such as for example the structure and size of the valve, t;he ratio of steam to condensed water, and the like, though the deflection of the indication pointer or the output of the speaker is proportional to the vibration detected by the probe.
DISCLOSURE OF THE INVENTION (Technical Problems that the Invention is to solve) rAn object of the present invention is to provide a steam -Iz.
3 rr 3 trap operation detector in which vibration generated in a steam valve, such as a steam trap or the like, can be grasped exactly ii and quantitatively by reference to preliminarily stored data as aI to kinds, sizes, and the like.
IAnother object of the invention is to provide a steam trap i operation detector in which vibration owing to a flow of steam can be detected iith distinction from vibration owing to a flow of condensed water by the detection on consideration of steam temperature within the steam trap.
A further object of the invention is to provide a steam trap operation detector in which the presence of steam leakage can be exactly grasped with eliminating an influence based on variations in steam pressure within the steam trap. The steam pressure may be manually established by the user or may be automatically computed from the measured temperature.
A still another object of the invention is to provide a steam trap operation detector in which wide-range vibration generated in a steam trap can be detected efficiently.
A still further object of the invention is to provide a steam trap operation detector in which influence of externally transmitted vibratory noise is eliminated so that vibration Sgenerated in a steam trap can be detected with no error.
(Technical Means for Solving the Problems) The steam trap operation detector according to the present invention comprises a vibration detecting section and an arithmetic section. The vibration detecting section includes a probe having one end which is shaped so as to be able to contact with an object to be detected with a predetermined pressure nd the other end on which a vibration sensor for converting mechanical vibration into an electric signal is provided, and the arithmetic section is arranged to compare the signal transmitted from the vibration detecting section with -torage data selected from necessary data stored in a memory so as to compute a steam leakage quantity of the object to be detected to thereby generate an output for the purpose of judging whether the operating condition of the object to be detected is good or not on the basis of the result of computation.
The steam trap operation detector according to the invention can store data of the relation between the steam leakage quantity and the vibration level as storage data corresponding to the variations in construction, nominal size, etc. of the object to be detected, The steam trap operation detector according to the invention can store data as to the relation between the steam leakage quantity and the vibration level.as storage data corresponding to the variations in steam pressure of the object to be detected.
In the steam trap operation detector according to the invention, a temperature sensor may be additionally provided at the top end of the probe in order to discriminate the fluid material within the object to be detected on the basis of the temperature range thereof.
In the steam trap operation detector according to the invention, the temperature sensor may be attached at the top end of the probe through a heat insulator in order to eliminate the influence of heat radiation.
In the steam trap operation detector according to the invention, the probe may be formed so as to have a pointed top XTv -a L- 6. 1 end for the purpose of eliminating an error in detection due to the variations in heat conduction.
The steam trap operation detector according to the invention may include diaphragm means having a plurality of resonant points for the purpose of detecting the vibration of a variety of objects to be detected which are different in construction, size, etc. from each other.
The steam trap operation detector according to the invention has a structure for reducing the transmission of vibration from the body of the detector or the outside thereof in order to detect the vibration of the object to be detected exactly.
(Effects of the Invention) According to the present invention, an arithmetic section is operated while a probe is brought into contact with an object to be detected with predetermined pressure, so that it is possible to detect presence and degree of steam leakage exactly with good reproducibility and it is possible to eliminate any error owing to the user in judgment as to whether the operating condition of the object to be detected is good or not.
Further, the judgment can be made more exactly by preliminarily selecting stored data in accordance with the distinction in i construction, nominal size, steam pressure, etc. of the object to be detected.
Further, according to the invention, whether the fluidity is of only condensed water or of a mixture of steam and condensed water can be judged more exactly by additionally detecting the temperature of the object to be detected. Further, any error in detection due to the use condition or individual diff- R erence of the user can be eliminated by improving the attaching 01 6 structure of tha temperature detecting sensor and the structure of the probe.
Furthermore, according to the invention, the detector can cope, as it is, with variations in vibration depending on variations in kind and use condition of the object to be detected, by provision of a diaphragm resonant with a plurality of vibrations for transmitting vibration to a vibration sensor.
In addition, according to the invention, accuracy in detection of vibration or in other words accuracy in judgment of the operating condition of the object to be detected can be improved by eliminating unnecessary vibration transmission passage to a vibration sensor to the utmost.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal section and an electrical block diagram showing a construction of the steam trap operation detector according to the present invention; Fig. 2 is a characteristic curve graph showing the relation between the vibration level and the steam leakage quantity on the basis of variations in construction of steam traps; Fig. 3 is a longitudinal section and an electrical block diagram showing another construction of the steam trap operati- Son detector according to the present invention; Fig. 4 is a characteristic curve graph showing the amplitude condition of vibration owing to the flow of steam and condensed water; Fig. 5 is a longitudinal sectional view showing the construction of the top end of the probe in the steam trap operation detector according to the present invention; Figs. 6 and 7 are longitudinal sectional views showing the I’NT 0′ h.LU P ‘1 I ~1 7 construction of the top end of the probe in the steam trap operation detector according to the present invention; Fig. 8 is a longitudinal section and an electrical block diagram showing a further construction of the steam trap operation detector according to the present invention; Figs. 9 and 10 are characteristic curve graphs showing the relation between the ultrasonic frequency and vibration level; and Figs. 11 and 12 are longitudinal sections and electrical block diagrams respectively showing further constructions of the steam trap operation detector according to the present invention.
BEST MODES FOR EXECUTION OF THE INVENTION Referring to Fig. 1, there is shown the whole construction of the steam trap operation detector according to the present invention. The steam trap operation detector is constituted by a detecting section 1, and an arithmetic section 50. The detecting section 1 and the arithmetic section 50 are electrically connected to each other through a cable 51.
The detecting section 1 has a probe 2 arranged to be slidable as shown by the double-headed arrow in Fig. 1, a probe holding member 4 arranged to enclose the probe 2, a bod, 5, a front cover 6 for connecting the holding member 4 to the body and a rear cap provided with a port 25 for leading out a cable 51. A substantially cylindrical inside space is defined by the front cover 6, the body 5 and the rear cap 7, and in the thus defined inside space there are provided vibration detecting elements including a diaphragm holding plate 15 for holding a diaphragm 11, a microphone holder 18 for holding an ultrasonli~~r I.*m I 8ic microphone 16 as a vibration sensor through an O-ring 17, a spring holder 19 for holding a coiled spring 22 for urging the probe 2 forward, and a circuit board 20, including amplifying, for electrically processing the electric signal converted by the ultrasonic microphone 16 to thereby output the processed signal. The probe holding member 4 has an upper conical portion and a lower cylindrical portion. A longitudinal hole 9 i, formed through the upper conical *ortion, and the probe 2 is urged forward by the spring 22 so that the top end of the probe 2 normally projects from the top end of the hole 9. The probe 2 is arranged so as to be slidable backward to a position where the top endthereof is registered with the top end of the holding member 4, when urging force is exerted on the top end of the probe 2. The probe 2 is formed so that the top end thereof can be brought into contact with an object to be detected (not shown), and that the rear end thereof can be pressed into a diaphragm mounting member 11 so as to be integrated therewith.
A diaphragm 21 is fixed to the diaphragm mounting member 11 at the opposite side to the probe by a screw or any other suitable means. The ultrasonic microphone 16, as a vibration i sensor, is provided to face the diaphragm 21. The output terminal of the ultrasonic microphone 16 is connected to the circuit board 20 containing an amplifying circuit and other necessary circuits. The holding plate 15, the spring holder 19 and the microphone holder 18 are connected to each other by a screw 23.
The arithmetic section 50 has an input-output interface I/O, a central processing unit CPU, a memory M, a key-input Al! unit K, a display unit D, and a speaker S. According to the
VT
LF >4 9 purposes of use, a printer unit P for printing the result of computation, and a function for transferring computed data to a host computer or the like may be additionally provided in the section The relation between vibration levels and steam leakage quantities corresponding to variations in construction and size of a variety of steam traps can be stored in the memory M in the arithmetic section 50. Fig. 2 is a characteristic curve graph with the vibration level as the abscissa and the steam leakage quantity as the ordinate, with variations in construction of various steam traps as a parameter. As shown in Fig. 2, the respective steam traps are different in leakage quantity even though they are in one and the same vibration level A.
More specifically, even if all the steam traps are in one and the same vibration level A, the leakage quantity in the steam trap having a free-bucket structure may be B, the leakage quantity in the steam trap having a free-float structure may be C, and the leakage quantity in the steam trap having a thermodynamic structure may be D. Accordingly, the relation between the steam leakage quantity and the vibration level preliminarily measured corresponding to the distinction in construction, Ssize, steam pressure, etc. of the steam traps is stored in the memory M, and then necessary conditions, such as the kind of the steam trap, the construction thereof, the steam pressure used in the steam trap, and the like, are set through the keyinput unit K, so that the central processing unit CPU can perform computation exactly at the time of leakage detection.
The operation of the aforementioned detector is as follows. The top end of the probe 2 of the detecting section 1 is i i_ brought into contact with the object to be detected, so that mechanical vibration existing in the target is transmitted to the diaphragm mounting member 11 to thereby cause the diaphragm 21 vibrate. The vibration of the diaphragm 21 is propagated in the space within the microphone holder 16 so as to be converted into an electric signal by the ultrasonic microphone 16 disposed in opposition to the diaphragm 21. The electric signal is suitably amplified by the circuit board 20 and then transmitted to the arithmetic section 50 through the cable 51. Receiving an input signal proportional to the detected vibration level and transmitted from the detecting section 1 to the arithmetic* section 50 through the cable 51, the central processing unit CPU per-forms computation on the basis of the set conditions so as to actuate the display unit D and/or speaker S on the basis of the result of computation. The result of computation has been obtained through processing by making reference to the predetermined data preliminarily stored in the memory H. Accordingly, because a true vibration level is exactly expressed on consideration of the distinction in construction, size, use condition, etc. of the object to be detected, the result is always suited to the conditions.
Fig. 3 shows another odiment of the structure according to the present invention. In Fig. 3, the same parts as those in Fig. 1 are correspondingly referenced. The different point from Fig. 1 is in that: a temperature sensor 10 is provided at the top end of the probe 1; a hole 12 for insertion of lead wire of the temperature sensor 10 is formed in the top end portion of the probe 1; and a microswitch 31 is disposed in the ‘S A4/ holding member 15. According to the construction of Fig. 3, it is possible to judge whether the leakage in the steam trap is of only condensed water or of a mixture of condensed water and steam. According to the steam trap operation detector of the present invention, the temperature as well as the mechanical vibration of an object to be detected can be detected. Detection of temperature of the steam trap brings the following effect. Generally, steam traps are classified in accordance with the operational principle thereof into of the mechanical type using the specific weight difference between steam and condensed water, of the thermodynamic type using the thermodynamic characteristic difference between steam and condensed water, of the thermostatic type using the temperature difference between steam and condensed water, and of the temperature adjusting type in which condensed water having a temperature lower than a predetermined temperature is exhausted. Of the variety of steam traps, in those of the mechanical type, of thermodynamic type and of the thermostatic type, the temperature is lower than the saturated steam temperature by several degrees (GC) or tens of degrees in the case where condensed water is exhausted normally. Accordingly, in the case where the steam trap Vis short in capacity, in the case where the condensed-water J- exhausting function of the steam trap becomes abnormal or perfectly bxtoken down, or the like, condensed water remains in the upstream of the steam trap. Therefore, in such cases, the temperature of the steam trap becomes lower than that in the case where condensed water is being exhausted normally. In this viewpoint, in the embodiment, the temperature of the steam trap as an object to be detected is detected by the temperature V, sensor provided at the top end of the probe 2 in this embodime- 12nt to make it possible to detect the operating condition including lowering of the condensed-water exhausting function through judgment executed in the arithmetic section 50 on the basis of the detected temperature. On the other hand, the microswitch 31 is used in such a manner that when the top end of the probe 2 is brought into sufficient contact with the object to be detected so that the diaphragm holding member 11 exceeds a predetermined distance, or in other words, when preparation for measurement has been completed, the microswitch 31 is actuated to turn on the electric source for the detecting section and arithmetic section. The lead wire from the contact of the microswitch 31 is connected to the circuit board 20 so that the electric source system not shown can be automatically switched on and off.
According to the construction of Fig. 3, not only the operation of steam traps can be detected in the same manner as described above for the construction of Fig. 1, but the temperature data of steam traps in the operating condition can be obtained by the temperature sensor 10 so that the judgment of the operating condition inclusive of the condensed-water exhausting function can be made more exactly. It will be apparent that the arithmetic section 50 may have a function of comparing “the temperature data obtained by the temperature sensor 10 with a reference value for the purpose of judgment, as well as wellknown attendant functions, such as a displaying function, an alarming function and the like.
Further, “he deterioration of the condensed-water exhausting function can be detected more accurately by inputting the 1- used steam pressure through the key-input unit and establishing -o T 13 the reference temperature on the basis of the saturated steam temperature. Further, in the case where the object to be detected is a steam trap of the temperature adjusting type, the deterioration of the condensed-water exhausting function can be detected exactly by setting the reference temperature to be lower than the preliminarily set temperature of the exhaust condensed water so that condensed water of the range lower than the set temperature can be exhausted.
As described above, if the temperature of an object to be detected is measured by the temperature sensor 10 provided at the top end of the probe 2, the saturated pressure of internal steam can be known. The relation between such pressure and amplitude of vibration is shown in Fig. 4. Accordingly, the presence or magnitude of a steam flow or a condensed-water flow can be known by the vibration corresponding to the value of pressure deduced from the temperature detected by the temperature sensor. Also in this case, storage of necessary data and t computation based on the storage data are automatically executed by the arithmetic section Fig. 5 shows a modification of the present invention, improved in arrangement of the temperature sensor which is disposed at the top end of the probe as shown in Fig. 3. As described above, the addition of the temperature detecting function to the vibration detecting function preferably brings improvement of detecting accuracy and increase of detection items. However, the probe is, *in most cases, formed of a heatconductive material, such as stainless steel or the like.
Accordingly, when the temperature of the temperature sensor Sis raised up by heat conduction from the object to be detected, 14 heat conduction occurs also through the probe, so that the temperature rising in the temperature sensor itself becomes unstable. In this viewpoint, the subject of this embodiment is in that a tube-like heat insulator 43 of a suitably selected material is fitted into a concavity 41 formed in the top end of the probe 4 so that the temperature sensor 10 is disposed at the top of the tube-like heat insulator. The temperature sensor 10 is arranged to project slightly from the top end of the probe 4. Lead wire 10J_ of the temperature sensor 10 is led to the circuit board not shown, through a hole 44 of the heat insulator 43 and the hole 12 of the probe 4. The heat insulator 43 must have the characteristic of transmitting mechanical vibration sufficiently. Preferably, a ceramic tube is used as the heat insulator 43 for the purpose of fulfilling the heatinsulating effect while transmitting vibration in the same manner as a metal material.
Figs. 6 and 7 shows modifications of the present inventk.ion, which are improved in the structure of the top end of the probe. According to the construction of the probe in the aforementioned operation detector, the detected vibration level often changes depending on the contacting condition with the object to be detected. Although the probe is designed to be continuously pressed forward for the purpose of avoiding individual difference due to the users, the same contacting condition can not always be attained because the surface of the object to be detected is, in most cases, curved. Further, the contacting condition often changes by the distinction in the peculiar way of the users. Accordingly, there arises a difference in detection of vibration between the case where the probe is in N -V plane contact with the object to be detected and the case where the probe is in point contact with the object to be detected.
Such a difference in detection of vibration brings about an error in fundamental data to be computed, resulting in undesirable misjudgment. In the modification of Fig. 6, in order to avoid such undesirable misjudgment, a projection 62 is formed at the top end 61 of a probe 60 longitudinally inserted through the hole of the probe holding member 4. Further, a temperature sensor 65 continuously pressed forward by a spring 64 is attached to a concavity 63 formed at the top end of the probe 60. According to this construction, the probe is continuously in point contact with an object 66 to be detected, so that substantially uniform measurement of vibration can be made, irrespective of the external form of the object 66 to be detected and the peculiar way of the user. In this case, contact sufficient to detect the temperature can be made because the temperature sensor 65 is urged against the object 66 to be detected by the spring 62, but vibration is little transmitted because it is absorbed by the spring 62.
Fig. 7 shows a second form in which the top end of the probe is modified. The construction of Fig. 7 is similar to that of Fig. 6, except that a projection 67 is formed by cutting the top end of the construction of Fig. 6 so as to be indclined. The construction of Fig. 7 can be formed easily by working.
Fig. 8 shows a modification of the present invention, which is improved in structure of the diaphragm for converting mechanical vibration detected by the probe into an ultrasonic wave. Each of a series of operating condition detectors descr- 16 ibed above in the foregoing embodiments has a single resonant point because a single diaphragm is used. It is generally known that the sensitivity of the diaphragm is large in the vicinity of its resonant frequency (resonant point) but very small in the other points. In the case where the operating condition of steam traps is detected on the basis of the magnitude of vibration, it is necessary to attach a diaphragm preliminarily suitably selected on the assumption of the frequency of vibration which will be generated or to prepare several kinds of detecting sections corresponding to the variations in vibration frequency, because the vibration generated owing to the steam current or condensed-water current of steam traps can be specified in accordance with the distinction in construction, size, etc. of the steam traps. According to the construction of Fig. 8, a plurality of diaphragms 82 to 84 are fixed to the rear of the probe holding member 11 by a screw 85 along the axis of the probe 2. In Fig. 8, the same parts as those in Figs. 1 and 3 are correspondingly referenced. An elastic member 32 formed of synthetic rubber is interposed between the probe holding member 4 and the front cover 6. An elastic member 33 of the same material is interposed in the hole 9 and between the probe 2 and the probe holding member 4. Similarly, an elastic member 34 surrounds the ultrasonic microphone 16.
-77, Further, elastic members 35 and 36 are provided at two places in the outside of the diaphragm mounting member 11ii. The respe- i ctive elastic members 32 to 36 are used for the purpose of absorbing undesirable vibratory noise which is caused by vibration generated by parts other than the object to be detected 11 and which is given to any one of the vibration detecting membe-
I
I
ili *o, S17 rs, that is, the probe 2, the diaphragm mounting member 11, the diaphragms 81 to 84, and the ultrasonic microphone 16.
In the construction of Fig. 8, the distance between the diaphragm mounting member 11 and the ultrasonic microphone 16 was selected to be 9.19 mm. In this embodiment, four diaphragms each having a thickness of 0.9 mm and an external diameter of 15 mm were used, and attached to the diaphragm mounting member 11 with spacers each having a thickness of 0.4 mm and an external diameter of 4.5 mm and interposed between adjacent diaphragms. In the case where the distance between the diaphragm mounting member 11 and the ultrasonic microphone 16 was selected to be 9.19 mm, and only one diaphragm having a thickness of 0.3 mm and an external diameter of 15 mm was attached to the diaphragm mounting member 11, the resonant frequency was 43.5 kHz as shown in Fig. 9. On the contrary, in the case where the four diaphragms 81 to 84 as described above were used, the resonant frequency could be extended to a range of from 40 kHz to 47 kHz as shown in Fig. 10. Accordingly, the vibration of steam traps within the resonant frequency range can be detected in high sensitivity by one and the same detecting section. It is a matter of course that modifications or changes in the number and size of the diaphragms may be made and that various detecting sections different in resonant frequency range can be formed by such modifications or changes.
Fig. 11 shows a further embodiment of the present invention. In the aforementioned embodiments, the influence of vibration transmitted to the ultrasonic microphone 16 through the body of the detecting section 1 was more or less exerted.
Therefore, elastic members as shown in Fig. 8 were provided at i i
I
4,
“L
L
18 several places. In this embodiment, the ultrasonic microphone 16 and the diaphragm 21 are separated so as to be in opposition Sto each other at a predetermined distance therebetween, and the two members and the distance therebetween are enclosed by an elastic member 34’ and fixed to the lower end of the diaphragm mounting member 11. According to this embodiment, vibration from the body 5 and other parts is not transmitted to the ultrasonic microphone 16 which finally detects vibration and converts the detected vibration into an electric signal. Accordingly, vibration detection having less error can be executed. The output of the ultrasonic microphone 16 is connected to the circuit board 20. According to this embodiment, the vibration detected by the probe 2 can be efficiently transmitted to the diaphragm 21 and converted into an electric signal by the ultrasonic microphone 16, so that exact measurement of vibration or in other words exact judgment of the operating condition of steam traps can be made.
Fig. 12 shows a still another embodiment of the present invention, which is improved in the arrangement of the ultrasonic microphone 16 and the diaphragm 21 and in the connection thereof to the circuit board 20 in the construction of Fig. 11.
In Fig. 12, the distance between the ultrasonic microphone 16 and the circuit board 20 is enlarged more sufficiently, so that the two are flexibly connected through lead wire 92 such as soft electrically-conductive wire. Generally, vibration applied to the body 1 from the outside is transmitted to the circuit board 20 containing an amplifying circuit so that the vibration is transmitted to the ultrasonic microphone 16 through the stiff connection pin of the ultrasonic microphone, whereafter Iw V J ‘4B~ 14lL ~I 19 the vibration is superposed on vibration transmitted via the space from the diaphragm 21 as the original passage so that the thus superposed vibration is converted to an electric signal.
As the result, an error may arise in the output. This embodiment is arranged to avoid such situation. According to this embodiment, the circuit board 20 is attached to the body 5 by a holding member 93 formed of an elastic material, such as synthetic rubber or the like to thereby prevent the propagation of vibration from the outside, and further, the circuit board and the ultrasonic microphone 16 are electrically connected through the soft conductive wire 92 to thereby prevent the transmission of the outside vibration to the ultrasonic microphone 16 securely. Consequently, the output proportional to the true vibration transmitted from the probe 2 is transmitted to the arithmetic section 50 to thereby improve the accuracy in detection.
INDUSTRIAL FIELD OF UTILIZATION The steam trap operation detector according to the present invention relates to an operation detector for detecting the operating condition of steam traps used in a steam system at steam appliances, such as a steam-motive electric power plant, a chemical plant, a manufacturing equjipitit, or the like. The steam trap operating condition detector is used for detection of breakdown places in case of occurrence of abnormality as well as in daily checking and maintenance of steam traps indispensable to the aforementioned plant and equipment. Particularly, the detector according to the present invention is superior in accuracy in detection to the conventional detector.
Accordingly, the functional deterioration of steam traps can be Ii
LII
7 N T r 20 detected in the earlier stage to thereby prevent serious accidents, improve operating efficiency on the whole of such equipment, and prevent the waste of expensive energy.
-IU i liJ.i_..
x

Claims (3)

1. A steam trap operation detector comprising a detecting section and an arithmetic section; said detection section including: a probe arranged to be brought into contact with an object to be detected with a predetermined pressure given by an elastic member for detecting mechanical vibration owing to a steam current and a condensed-water current within said object to be detected; diaphragm means for generating ultrasonic vibration in response to said mechanical vibration detected by said probe a vibration sensor provided in opposition to said diaphragm means for converting said ultrasonic vibration into an electric signal; a circuit board containing an amplifying circuit for amplifying an output signal of said vibration sensor so as to transmit the amplified output to the outside; said arithmetic section including; a memory for storing data corresponding to a variety of steam traps inclusive of said object to be detected; a central processing unit for performing computation while executing comparison between the output signal transmitted from said detecting section and predetermined data selectively obtained from said data stored in said memory; and output units for displaying the result of computation of said central processing unit and/or for generating a sound output of an audible frequency. 891030, !psspe~l3,tlv.res, Li ~A U 22 1 2. A steam trap operation detector according to claim 2 1, in which said memory included in said arithmetic section 3 has data stored therein corresponding to distinction in 4 construction of said variety of steam traps, so that a result corrected in accordance with distinction in kind of 6 said object to be detected is computed out. 7 3. A steam trap operation detector according to Claim 8 1, in which said memory included in said arithmetic section 9 has data stored therein corresponding variations of steam pressure within steam traps, so that a result corrected in 11 accordance with steam pressure used in said object to be e Qo: 12 detected is computed out. too: 0:00 13 4. A steam trap operation detector according to Claim t*: ose 14 i, in which a temperature sensor is disposed at a top end 15 portion of said probe which is to brought into contact with 16 said object to be detected so that a temperature of said 17 object to be detected is detected so as to generate an 18 electric output corresponding to the detected temperature, 19 and in which temperature data are preliminarily stored in said memory in said arithmetic section, whereby whether the 21 operation of said object to be detected is good or not is 22 judged on the basis of comparison between an output of said 23 temperature sensor and predetermined data selectively 24 obtained from said temperature data stored in said memory.

5. A steam trap operation detector according to claim 26 4, in which said temperature sensor is attached in a 27 concavity of said probe through a heat insulator for $rt 28 preventing heat conduction without influence on transmission .29 of vibration through said probe. 891030,!psspe013,tlv.res, 4 2 3 4 6 7 8 9 -23 9*t**9 *0*a S I I

54. tIt C C tSp’,, 6. A steam trap operation deLector according to Claim 4 or 5, in which a poin ted-end projection is formed at t he top end of said probe and a concavity is formed at a position lower than said. pointed-end projection, so that said temperature sensor is kept to be pressed toward said pointed-end projection by an elastic material provided in said concavity. 7. A steam trap operation detec tor according to any one of the preceding claims, in which said. diaphragm means for generating ultrasonic vibration owing to said mechanical vibration transmitted from said probe includes a plurality of diaphragms which are fixed at predetermined intervals in an axial direction of said probe. 8. A steam trap operation detector according to any one of the preceding claims in which said diaphragm and said vibration sensor are enclosed by a hollow elastic member and one end of said hol low elastic member is attached to a diaphragm mounting member, so that said mechanical vibration is transmitted from said probe to said vibration sensor without influence of outside vibratory noise. 9. A steam trap operation detector according to any one of the preceding claims, in which said circuit board is attached to a body through an elastic member and terminals of said vibration sensor are flexibly connected to terminals of said circuit board through soft conductive wire, so that said mechanical vibration is transmitted from said probe to said ultrasonic sensor without influence of outside vibratory noise. A steam trap operation detector substantially as 4 891030, !psspeOl3,tlv.res, r 1 hereint 2 particu 3 4 DATED T 6 SMITH S 7 Fellows 8 Attorne 9 Patent 7 i 24 )efore described with reference to any one of the lar embodiments shown in the accompanying drawings. HIS 30th October, 1989 HELSTON BEADLE Institute of Patent ys of Australia. Attorneys for the Applicant LTD. TLV CO. 11 12 ii t oiirre r rtrr r rrrt rr *ri r Vt, 891030,!psspe013,tlv.res, ABSTRACT The Gteam trap operation detector related to the invention is an operation detector for judging the operating condition of steam traps used in a variety of steam appliances, the operation detector comprising a vibration detecting section (1) and an arithmetic section (50) for processing the signal detected by the vibration detecting section so as to output the result of computation. The detecting section includes a probe arranged to be brought into contact with an object to be detected with a predetermined pressure given by an elastic member for detecting mechanical vibration owing to a steam current and a condensed-water current within the object to be detected, diaphragm means (21) for generating ultrasonic vibration in response to the mechanical vibration detected by the probe a vibration sensor (16) provided in opposition to the diaphragm means (21) for converting the ultrasonic vibration into an electric signal, and a circuit board containing an amplifying circuit for amplifying an output signal of the vibration sensor (16) so as to transmit the amplified output to the outside. The arithmetic section includes a memory for storing data corresponding to a variety of steam traps inclusive of the object to be detected, a central processing unit (CPU) for performing computation while executing comparison between the output signal transmitted from the detecting section and predetermined data selectively obtained from the data stored in the memory and output units S) for displaying the result of computation of the central processing unit (CPU) and/or for generating a sound output of an audible frequency. Further, in i7VT C.5 P4 r at 1 TI.. the operation detector according to the present invention, a temperature sensor (10) may be additionally provided at the top end of the probe of the detecting section so that the operation the respective steam traps can be exactly judged by reference to the temperature and/or steam pressure of the object to be detected. ,1r a’ ,-i I ii r i, 3 -1

AU12441/88A
1987-02-09
1988-02-08
Steam-trap operation monitor

Ceased

AU593463B2
(en)

Applications Claiming Priority (16)

Application Number
Priority Date
Filing Date
Title

JP62029164A

JPS63195498A
(en)

1987-02-09
1987-02-09
Steam leakage-quantity measuring device

JP62-29164

1987-02-09

JP62230821A

JPS6474397A
(en)

1987-09-14
1987-09-14
Operation detector for steam trap

JP62-230821

1987-09-14

JP63-2758

1988-01-12

JP275888U

JPH056501Y2
(en)

1988-01-12
1988-01-12

JP1988003333U

JPH0524192Y2
(en)

1988-01-13
1988-01-13

JP63-3335

1988-01-13

JP1988003335U

JPH01107936U
(en)

1988-01-13
1988-01-13

JP63-3334

1988-01-13

JP63-3333

1988-01-13

JP1988003334U

JPH01107934U
(en)

1988-01-13
1988-01-13

JP63006648A

JPH01182724A
(en)

1988-01-14
1988-01-14
Vibration meter

JP63006649A

JPH06100319B2
(en)

1988-01-14
1988-01-14

Steam trap pass / fail detector

JP63-6649

1988-01-14

JP63-6648

1988-01-14

Publications (2)

Publication Number
Publication Date

AU1244188A

AU1244188A
(en)

1988-08-24

AU593463B2
true

AU593463B2
(en)

1990-02-08

Family
ID=27571473
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

AU12441/88A
Ceased

AU593463B2
(en)

1987-02-09
1988-02-08
Steam-trap operation monitor

Country Status (11)

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Link

US
(1)

US4898022A
(en)

EP
(1)

EP0402463B1
(en)

KR
(1)

KR960007442B1
(en)

AT
(1)

ATE88000T1
(en)

AU
(1)

AU593463B2
(en)

BR
(1)

BR8805263A
(en)

DE
(1)

DE3880152T2
(en)

FI
(1)

FI94080C
(en)

HK
(1)

HK1004626A1
(en)

NO
(1)

NO176493C
(en)

WO
(1)

WO1988005886A1
(en)

Families Citing this family (78)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

DE4303798C2
(en)

1993-02-10
2000-12-14
Gestra Gmbh

Procedure for monitoring steam traps

US5479359A
(en)

1993-03-17
1995-12-26
Metcalf & Eddy, Inc.
Automated data collection system for fugitive emission sources

US5719785A
(en)

1994-05-17
1998-02-17
Standifer; Larry R.
Detection and quantification of fluid leaks

US5535136A
(en)

1994-05-17
1996-07-09
Standifer; Larry R.
Detection and quantification of fluid leaks

US5616829A
(en)

1995-03-09
1997-04-01
Teledyne Industries Inc.
Abnormality detection/suppression system for a valve apparatus

ES2127122B1
(en)

1996-09-02
1999-12-16
Blaquez Navarro Vicente

AUTONOMOUS ELECTRONIC IMPROVED MONITORING SYSTEM FOR PURGERS, VALVES AND INSTALLATIONS IN REAL TIME.

US6571180B1
(en)

1997-04-11
2003-05-27
Keystone International Holding Corp.
Self-contained steam trap monitor

JPH1139030A
(en)

1997-07-15
1999-02-12
Tlv Co Ltd
Equipment management device and computer-readable recording medium recording equipment management program

JPH1137836A
(en)

1997-07-22
1999-02-12
Tlv Co Ltd
Use restricting device for measuring apparatus

GB2355796B
(en)

1998-05-04
2002-10-30
Csi Technology Inc
Ultrasonic monitoring device

GB2337118A
(en)

1998-05-06
1999-11-10
Csi Technology Inc
Interchangeable sensor monitoring device

JP2954183B1
(en)

1998-07-17
1999-09-27
株式会社ミヤワキ

Steam trap inspection method, inspection apparatus and management system

JP3390806B2
(en)

1999-12-28
2003-03-31
株式会社テイエルブイ

Position recognition device, measurement device provided with this position recognition device, and measurement system

WO2005010522A2
(en)

2003-07-18
2005-02-03
Rosemount Inc.
Process diagnostics

US7938783B2
(en)

2003-08-19
2011-05-10
Advanced Monitors Corporation
Medical body core thermometer

JP3790527B2
(en)

2003-10-03
2006-06-28
株式会社テイエルブイ

Operation method of facility diagnosis summary system, and facility diagnosis summary system

US7791290B2
(en)

2005-09-30
2010-09-07
Virgin Islands Microsystems, Inc.
Ultra-small resonating charged particle beam modulator

US7586097B2
(en)

2006-01-05
2009-09-08
Virgin Islands Microsystems, Inc.
Switching micro-resonant structures using at least one director

US7626179B2
(en)

2005-09-30
2009-12-01
Virgin Island Microsystems, Inc.
Electron beam induced resonance

US7246036B2
(en)

2004-12-08
2007-07-17
Armstrong International, Inc.
Remote monitor for steam traps

US7664610B2
(en)

2005-09-28
2010-02-16
Rosemount Inc.
Steam trap monitoring

WO2007064358A2
(en)

2005-09-30
2007-06-07
Virgin Islands Microsystems, Inc.
Structures and methods for coupling energy from an electromagnetic wave

US7579609B2
(en)

2005-12-14
2009-08-25
Virgin Islands Microsystems, Inc.
Coupling light of light emitting resonator to waveguide

US7619373B2
(en)

2006-01-05
2009-11-17
Virgin Islands Microsystems, Inc.
Selectable frequency light emitter

US20070190794A1
(en)

2006-02-10
2007-08-16
Virgin Islands Microsystems, Inc.
Conductive polymers for the electroplating

US20070200063A1
(en)

2006-02-28
2007-08-30
Virgin Islands Microsystems, Inc.
Wafer-level testing of light-emitting resonant structures

US7605835B2
(en)

2006-02-28
2009-10-20
Virgin Islands Microsystems, Inc.
Electro-photographic devices incorporating ultra-small resonant structures

US7443358B2
(en)

2006-02-28
2008-10-28
Virgin Island Microsystems, Inc.
Integrated filter in antenna-based detector

EP2005126B1
(en)

2006-04-03
2017-07-26
vonRoll infratec (investment) ag
Vibration sensor array

US7558490B2
(en)

2006-04-10
2009-07-07
Virgin Islands Microsystems, Inc.
Resonant detector for optical signals

US7876793B2
(en)

2006-04-26
2011-01-25
Virgin Islands Microsystems, Inc.
Micro free electron laser (FEL)

US20070252089A1
(en)

2006-04-26
2007-11-01
Virgin Islands Microsystems, Inc.
Charged particle acceleration apparatus and method

US20070264023A1
(en)

2006-04-26
2007-11-15
Virgin Islands Microsystems, Inc.
Free space interchip communications

US7646991B2
(en)

2006-04-26
2010-01-12
Virgin Island Microsystems, Inc.
Selectable frequency EMR emitter

US7746532B2
(en)

2006-05-05
2010-06-29
Virgin Island Microsystems, Inc.
Electro-optical switching system and method

US7656094B2
(en)

2006-05-05
2010-02-02
Virgin Islands Microsystems, Inc.
Electron accelerator for ultra-small resonant structures

US7569836B2
(en)

2006-05-05
2009-08-04
Virgin Islands Microsystems, Inc.
Transmission of data between microchips using a particle beam

US7741934B2
(en)

2006-05-05
2010-06-22
Virgin Islands Microsystems, Inc.
Coupling a signal through a window

US7557647B2
(en)

2006-05-05
2009-07-07
Virgin Islands Microsystems, Inc.
Heterodyne receiver using resonant structures

US7723698B2
(en)

2006-05-05
2010-05-25
Virgin Islands Microsystems, Inc.
Top metal layer shield for ultra-small resonant structures

US8188431B2
(en)

2006-05-05
2012-05-29
Jonathan Gorrell
Integration of vacuum microelectronic device with integrated circuit

US7718977B2
(en)

2006-05-05
2010-05-18
Virgin Island Microsystems, Inc.
Stray charged particle removal device

US20070257273A1
(en)

2006-05-05
2007-11-08
Virgin Island Microsystems, Inc.
Novel optical cover for optical chip

US7554083B2
(en)

2006-05-05
2009-06-30
Virgin Islands Microsystems, Inc.
Integration of electromagnetic detector on integrated chip

US7732786B2
(en)

2006-05-05
2010-06-08
Virgin Islands Microsystems, Inc.
Coupling energy in a plasmon wave to an electron beam

US7986113B2
(en)

2006-05-05
2011-07-26
Virgin Islands Microsystems, Inc.
Selectable frequency light emitter

US7710040B2
(en)

2006-05-05
2010-05-04
Virgin Islands Microsystems, Inc.
Single layer construction for ultra small devices

US20070272931A1
(en)

2006-05-05
2007-11-29
Virgin Islands Microsystems, Inc.
Methods, devices and systems producing illumination and effects

US7583370B2
(en)

2006-05-05
2009-09-01
Virgin Islands Microsystems, Inc.
Resonant structures and methods for encoding signals into surface plasmons

US7728702B2
(en)

2006-05-05
2010-06-01
Virgin Islands Microsystems, Inc.
Shielding of integrated circuit package with high-permeability magnetic material

US7728397B2
(en)

2006-05-05
2010-06-01
Virgin Islands Microsystems, Inc.
Coupled nano-resonating energy emitting structures

US7586167B2
(en)

2006-05-05
2009-09-08
Virgin Islands Microsystems, Inc.
Detecting plasmons using a metallurgical junction

US7573045B2
(en)

2006-05-15
2009-08-11
Virgin Islands Microsystems, Inc.
Plasmon wave propagation devices and methods

US7679067B2
(en)

2006-05-26
2010-03-16
Virgin Island Microsystems, Inc.
Receiver array using shared electron beam

US7655934B2
(en)

2006-06-28
2010-02-02
Virgin Island Microsystems, Inc.
Data on light bulb

US7560716B2
(en)

2006-09-22
2009-07-14
Virgin Islands Microsystems, Inc.
Free electron oscillator

US7574918B2
(en)

2006-11-06
2009-08-18
Sun Microsystems, Inc.
Method and apparatus for detecting vibrations from a mechanical component

US7659513B2
(en)

2006-12-20
2010-02-09
Virgin Islands Microsystems, Inc.
Low terahertz source and detector

US8050875B2
(en)

2006-12-26
2011-11-01
Rosemount Inc.
Steam trap monitoring

US7990336B2
(en)

2007-06-19
2011-08-02
Virgin Islands Microsystems, Inc.
Microwave coupled excitation of solid state resonant arrays

US7791053B2
(en)

2007-10-10
2010-09-07
Virgin Islands Microsystems, Inc.
Depressed anode with plasmon-enabled devices such as ultra-small resonant structures

US8651126B2
(en)

2007-11-21
2014-02-18
Teva Pharmaceutical Industries, Ltd.
Controllable and cleanable steam trap apparatus

GB0807000D0
(en)

2008-04-17
2008-05-21
Hydralogical Ip Ltd
Improvements in and relating to steam wastage measurement and management

US20100252514A1
(en)

2009-04-03
2010-10-07
Min-Ju Chung
Foldable baseball equipment rack

ES2554687T3
(en)

2009-05-19
2015-12-22
Teva Pharmaceutical Industries Ltd.

Programmable steam trap

US8800373B2
(en)

2011-02-14
2014-08-12
Rosemount Inc.
Acoustic transducer assembly for a pressure vessel

US9157829B2
(en)

2011-12-30
2015-10-13
Spirax-Sarco Limited
Apparatus and method for monitoring a steam plant

GB2497994B
(en)

2011-12-30
2013-11-20
Spirax Sarco Ltd
A method for monitoring a steam plant

GB2497995B
(en)

2011-12-30
2014-04-30
Spirax Sarco Ltd
An apparatus and method for monitoring a steam plant

US10641412B2
(en)

2012-09-28
2020-05-05
Rosemount Inc.
Steam trap monitor with diagnostics

JP6435123B2
(en)

2014-06-30
2018-12-05
株式会社ミヤワキ

Fluid judgment device and fluid judgment method

JP6433300B2
(en)

2015-01-09
2018-12-05
株式会社テイエルブイ

Sensor device

JP1574753S
(en)

2016-10-11
2017-04-24

EP3574252A4
(en)

2017-01-30
2020-08-26
Latency, LLC
Systems, methods, and media for detecting abnormalities in equipment that emit ultrasonic energy into a solid medium during failure

US11255823B2
(en)

2018-09-24
2022-02-22
Armstrong International, Inc.
Steam/hot water device monitoring

USD884519S1
(en)

2018-09-24
2020-05-19
Armstrong International, Inc.
Handheld tester

US11125386B2
(en)

2019-07-15
2021-09-21
Consolidated Edison Company Of New York, Inc.
Sensor for steam trap and method of operation

CN113339688A
(en)

2021-06-02
2021-09-03
江苏高特阀业有限公司
Drain valve leakage monitoring system and method thereof

Family Cites Families (8)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

JPS56109025U
(en)

1980-01-23
1981-08-24

JPS59222697A
(en)

1983-06-01
1984-12-14
富士電機株式会社
Detector for blockade of steam trap

JPH0331920Y2
(en)

1985-05-15
1991-07-05

US4727550A
(en)

1985-09-19
1988-02-23
Chang David B
Radiation source

JPS62212542A
(en)

1986-03-14
1987-09-18
Tlv Co Ltd
Apparatus for measuring leak quantity of steam

CN1040467C
(en)

1986-04-15
1998-10-28
Tlv有限公司
Steam trap operation judging device

US4821769A
(en)

1986-11-12
1989-04-18
Cd Medical Inc.
Valve monitor and method

JPH109025A
(en)

1996-06-25
1998-01-13
Toyota Motor Corp
Fuel injection quantity control device of diesel engine

1988

1988-02-08
DE
DE88901466T
patent/DE3880152T2/en
not_active
Expired – Lifetime

1988-02-08
AU
AU12441/88A
patent/AU593463B2/en
not_active
Ceased

1988-02-08
AT
AT88901466T
patent/ATE88000T1/en
not_active
IP Right Cessation

1988-02-08
KR
KR1019880701231A
patent/KR960007442B1/en
not_active
IP Right Cessation

1988-02-08
WO
PCT/JP1988/000118
patent/WO1988005886A1/en
active
IP Right Grant

1988-02-08
BR
BR8805263A
patent/BR8805263A/en
not_active
IP Right Cessation

1988-02-08
US
US07/261,830
patent/US4898022A/en
not_active
Expired – Lifetime

1988-02-08
EP
EP88901466A
patent/EP0402463B1/en
not_active
Expired – Lifetime

1988-07-28
NO
NO883352A
patent/NO176493C/en
unknown

1988-08-17
FI
FI883814A
patent/FI94080C/en
active
IP Right Grant

1998

1998-04-07
HK
HK98102912A
patent/HK1004626A1/en
not_active
IP Right Cessation

Also Published As

Publication number
Publication date

EP0402463B1
(en)

1993-04-07

BR8805263A
(en)

1989-08-15

NO883352D0
(en)

1988-07-28

NO883352L
(en)

1988-08-11

FI94080C
(en)

1995-07-10

WO1988005886A1
(en)

1988-08-11

EP0402463A1
(en)

1990-12-19

EP0402463A4
(en)

1991-05-08

KR890700784A
(en)

1989-04-27

DE3880152T2
(en)

1993-11-11

ATE88000T1
(en)

1993-04-15

AU1244188A
(en)

1988-08-24

US4898022A
(en)

1990-02-06

DE3880152D1
(en)

1993-05-13

NO176493C
(en)

1995-04-12

FI883814A
(en)

1988-08-17

FI883814A0
(en)

1988-08-17

NO176493B
(en)

1995-01-02

FI94080B
(en)

1995-03-31

KR960007442B1
(en)

1996-05-31

HK1004626A1
(en)

1998-11-27

Contact information