GB1568949A – Servo pilot valve
– Google Patents
GB1568949A – Servo pilot valve
– Google Patents
Servo pilot valve
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Info
Publication number
GB1568949A
GB1568949A
GB17346/78A
GB1734678A
GB1568949A
GB 1568949 A
GB1568949 A
GB 1568949A
GB 17346/78 A
GB17346/78 A
GB 17346/78A
GB 1734678 A
GB1734678 A
GB 1734678A
GB 1568949 A
GB1568949 A
GB 1568949A
Authority
GB
United Kingdom
Prior art keywords
jet pipe
armature
pilot valve
plate
receiver
Prior art date
1977-05-13
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.)
Expired
Application number
GB17346/78A
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.)
Honeywell Inc
Original Assignee
Honeywell Inc
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.)
1977-05-13
Filing date
1978-05-03
Publication date
1980-06-11
1977-05-13
Priority claimed from US05/796,650
external-priority
patent/US4291716A/en
1978-05-03
Application filed by Honeywell Inc
filed
Critical
Honeywell Inc
1980-06-11
Publication of GB1568949A
publication
Critical
patent/GB1568949A/en
Status
Expired
legal-status
Critical
Current
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Classifications
F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
F15C3/00—Circuit elements having moving parts
F15C3/10—Circuit elements having moving parts using nozzles or jet pipes
F15C3/12—Circuit elements having moving parts using nozzles or jet pipes the nozzle or jet pipe being movable
Description
(54) SERVO PILOT VALVE
(71) We, HONEYWELL INC., a Corporation organised and existing under the laws of the State of Delaware, United
States of America, Honeywell Plaza,
Minneapolis, Minnesota 55408, United
States of America, do hereby declare the invention for which we pray that a patent may be granted to us and the method by which it is to be performed to be particularly described in and by the following statement: – This invention relates to pilot valves suitable for controlling servo valves.
According to the invention, there is provided a pilot valve comprising a jet pipe for directing a jet of fluid toward a receiver means; said receiver means including three superimposed plates, a first plate having a first opening communicating with a first outlet port of the valve, a second plate having a second opening communicating with a second outlet port of the valve, and a third, splitter, plate intermediate said first and second plates; and control means for moving the jet pipe relative to the openings in response to a control signal whereby said openings receive a differential amount of fluid dependent upon the position of the jet pipe relative to the receiver means.
Embodiments of the invention will now be described by way of example only with reference to the accompanying drawings, in which: – Figure 1 is a cross-sectional view of the pilot valve according to the presentation invention;
Figure 2 is a partial cross-sectional front view of the valve shown in Figure 1 but without the cover;
Figure 3 shows the surface topography of the surface of the receiver plates which face the splitter plate of the receiver shown in Figure 1;
Figure 4 is a front view of the splitter plate;
Figure 5 is a cross-sectional view of
Figure 1 taken along line A-A; Figure 6 is a fragmentary view of the jet pipe, splitter plate, and actuating arm assembly of the valve shown in Figure 1;
Figure 7 shows the jet pipe used in the pilot stage valves;
Figure 8 is an end view of the jet pipe; and,
Figure 10 shows an alternative construction for the pilot valve according to the invention.
The pilot valve 10 shown in Figure 1 has cover portion 11 secured by appropriate screws (not shown) to base section 12 and has sealing gasket 13 therebetween. Inlet port 14 communicates with chamber 15 through channel or aperture 16. Chamber 15 also communicates with threaded aperture 17 which has sealing plug 18 therein.
Extending through base 12 and suitably secured thereto, as by an adhesive, is hollow jet pipe 19 which communicates with the chamber 15. The other end of the jet pipe 19 is moved vertically within recess 20 of base 12 by actuating arm or push rod 21. As best shown in Figure 6, jet pipe 19, during assembly, is pushed through aperture 23 in flattened section 22 of push rod 21 until groove 24 (Figure 7) in jet pipe 19 snaps into aperture 23. Flattened section 22 and aperture 23 acts as a clip to secure jet pipe 19 to actuating arm 21.
Fluid is supplied to chamber 15 under pressure from a source connected to port 14 and travels from chamber 15 through jet pipe 19 and out of jet pipe 19 to receiver section 30. The receiver section comprises first and second receiver plates 31 and 32 with a splitter plate 33 sandwiched therebetween. Receiver plate 31 is shown in more detail in Figures 3 and 4 and comprises a plate having groove 34 cut in the surface of receiver plate 31 facing splitter plate 33. The groove extends from notch 35 at the edge of the receiver plate and extends to aperture 36 through the receiver plate. Receiver plate 32 is identical to receiver plate 31 and the two receiver plates are positioned with respective grooves 34 facing one another separated by splitter plate 33 and with their respective notches 35 directed towards the end of jet pipe 19 for receiving fluid therefrom.The receiver plates have an additional aperture extending therethrough at 37.
As better shown in Figure 5, aperture 36 of receiver plates 32 overlies aperture 37 of receiver plate 31. Alsa, aperture 37 of receiver plate 32 overlies aperture 36 of receiver plate 31. With this construction, groove 34 of receiver plate 31 extends from its notch 35 to its aperture 36 whereas groove 34 of receiver plate 32 extends from its notch 35 to its aperture 36. Aperture 46 of receiver plate 32 communicates with outlet port 40 through aperture 41 in splitter 33, aperture 37 in receiver plate 31 and channel 42 in base 12. Likewise, aperture 36 in receiving plate 31 communicates with corresponding outlet port 43 through channel 44 in base 12.It is to be noted that splitter plate 33 has no corresponding aperture to communicate aperture 37 of receiver plate 32 with aperture 36 of receiver plate 31 since groove 34 of receiver plate 31 communicates with port 43 through aperture 36 of receiver plate 31 and channel 44 without going through the splitter plate. Cover and sealing plate 45 is secured over the sandwiched construction of receiver plates 31 and 32 and splitter plate 33 by suitable screws 46, 47 and 48 which extends through suitable holes in cover plate 45, receiver plate 32, splitter plate 33 and receiver plate 31 and finally into base 12.
Fluid issuing from jet pipe 19 impinges onto notches 35 of receiving plates 31 and 32 and will travel along corresponding grooves 34 and then down respective channels 42 and 44 to respective ports 40 and 43. If the jet tube 19 is midway between notches 35 of receiver plates 31 and 32, an equal amount of fluid will be received at outlet ports 40 and 43. If the jet tube 19 is moved in an upward direction ,outlet port 40 will receive a greater proportion of the fluid and, if jet tube 19 is moved in a downward direction from its mid-position, outlet port 43 will receive a greater proportion of the fluid. Jet pipe 19 is moved vertically with respect to the receiving assembly 30 by the push rod or actuating arm 21. Actuating arm 21 is driven by a control mechanism or magnetic operator 50 shown in Figures 1 and 2.
Assembly 50 comprises generally U
shaped frame 51 of a low hysteresis magnetic flux conducting material. The frame
is shown in more detail in Figure 9 and
has appropriate slots 52 and 53 for re
ceiving screw 54, and slot 55 and a corre
sponding slot below 55 for receiving a
second screw corresponding to screw 54.
-Frame 51 has first arm 56 and second arm
57 connected together at their ends by
cross-piece or bight 58. In the preferred
embodiments, frame 51 is a unitary piece
which is stamped and bent in the generally
U-shaped fashion as shown. Arm 56 has
recess 60 therein and arm 57 has corre
sponding recess 61. Rare earth-cobalt mag
net 62 having a first polarity is set into
recess 60 and will be held thereto by its
magnetic attraction for frame 51. Second
rare earth-cobalt magnet 63 of opposite
polarity is inserted into recess 61 and will
be held thereto by its magnetic attraction
for frame 51. Rare earths such as
samarium, praseodymium and misch-metal
may be alloyed with cobalt to provide the
magnets with different magnetic properties.
Pole pieces 64 and 65 are respectively asso
ciated with and attached to magnets 62
and 63 by suitable means such as an ad
hesive. The magnetic circuit structure is
completed by armature 70 which is suitably
attached to cross-piece 58 of frame 51.
As shown, armature 70 is welded to
bracket 71 which is in turn welded to cross
piece 58 of frame 51.
Bobbin 72 is inserted over armature 70
and has corresponding U-shaped ends 74
and 75 aligned with the corresponding slots
52, 53 and 55 of frame 51 for receiving
corresponding screws 54. Screws 54 thus
secure control mechanism or magnetic
operator 50 to base 12. Finally, winding 76
is wound around 72 and is suitably supplied
with a pair of terminals (not shown) for
receiving the input signal from an external
source. Depending upon the polarity of the
signal applied to winding 76, the armature
will be either driven away from pole piece
64 to pole piece 65 or driven away from
pole piece 65 to pole piece 64.
Armature 70 has a clip 80 as shown for
releasably securing armature 70 to push
rod 21. Push rod 21 is inserted through
slot 81 of clip 80 into the aperture 89 therein. Therafter, screw 83 is inserted be
tween the front portion of clip 80 and
push rod 21 and a nut 84 is secured over
the screw 83 to pinch clip 80 against push
rod 21. Thus, push rod 21 cannot slide
with respect to armature 70 but is instead
driven by armature 70.
The upper end of push rod 21 has bulge
91 for butting against washer 90 which in
turn butts against spring 92. The spring 92 pushes against washer 93 which is. suit ably attached to one end of screw 94.
Screw 94 extends through press nut 95 which is pressed through aperture 96 of frame 51. Screw 94 may be driven by a suitable wrench, such as a hexagonal key wrench, for biasing push rod 21 and armature 70 in a vertical direction.
At the lower end of push rod 21 is bulge 100 which butts against washer 101 which in turn butts against feedback spring 102.
Feedback button 103 may be connected to a suitable feedback mechanism on the servo valve which is being controlled by pilot valve 10 for providing a feedback function. Biasing spring 92 and adjustment s;drew 94 are utilized to center jet tube 49 with respect to splitter plate 33 when no input is supplied to coil 76. Push rod 21 extends through a suitable slot 105 in frame 51.
In operation, with no input signal applied to coil 76, the fluid issuing from jet pipe 19 will be divided by splitter plate 33 to both receiving plates 31 and 32 so that out bt ports 40 and 43 receive equal amounts of fluid. As an input signal is applied to coil 76 of one polarity, armature 70 will be driven up pulling jet pipe 19 up to increase the flaw to outlet port 40 and decrease the flow to outlet port 43. If an opposite polarity signal is supplied to the coil 76, armature 70 is driven downward to correspondingly drive jet pipe 19 down to increase the fluid flow to outlet port 43 and decrease the fluid flow to outlet port 40.
Splitter plate 33 has generally U-shaped retaining arm 110 extending from one side thereof. One leg of U-shaped arm 110 is shorter than its opposite leg and terminates in clip 111. Clip 111 is formed of a Vshaped notch 112 with an aperture 113 at the apex of the V. During assembly clip 111 is bent down until jet pipe 19 snaps into aperture 113. In this manner, jet pipe 19 is retained against lateral motion along the edge of splitter plate 33 facing jet pipe 19 and is allowed only vertical motion across spitter plate 33 and receiver plates 31 and 32.
An alternative pilot valve 200 is shown in Fig. 10 which is basically the same type of construction as that shown in
Figures 1 to 9 but with the jet pipe running through the armature instead of being connected to the armature by pusher 21. Specfically, pilot stage valve 200 has a cover 201 which fits over base section 202 with gasket 203 for sealing. Magnetic arrangement 204 is essentially the same as shown in Figures 1 to 9 but, in Figure 10, is shown in partial cross section. Specifically, magnetic structure 204 comprises a generally U-shaped frame 205 having a bobbin 206 and winding 207 wound therearound. Through a center hole in bobbin 206 is mounted armature 208 attached to frame 205 by bracket 209. Clip 210 is inserted over the end of armature 208 and jet pipe 211 extends through the armature 208 and through base section 202 to chamber 212.Chamber 212 is connected to input port 213 by channel 214. Plug 215 seals chamber 212. The magnetic structure 204 also comprises magnets 216 and 217 with pole pieces 218 and 219. Armature 208 is biased by springs 220 and 221. Spring 220 is adjustable by screw 222 fitted through nut 223. Spring 220 is centered about plate 224 and projection 225. Spring 221 is centered by plate 226 and projection 227. Hydraulic fluid or other fluid is supplied through port 213 to chamber 212 and from there flows through jet pipe 211 and out of jet pipe 211 to receiving section 230.
Receiver section 230 comprises receiver plates 231 and 232 with a splitter plate 233 of the same construction as shown in
Figures 1 to 9. Splitter plate 233 terminates in a clip 234 which secures jet pipe 211 against transverse movement. Receiving section 230 has a cover plate 235 and the entire assembly is fastened to base 202 by screw 236. Channel 237 communicates one of the receiving plates 231 and 232 to an outlet port 238. The other receiving plate is connected in the manner shown in
Figures 1 to 9 to a second output port.
A feedback arrangement may comprise spring 240 hooked over a groove in jet pipe 211, such as groove 24 in jet pipe 19 of
Figure 7, and is attached at its other end to a crank arm 241.
As can be seen, the arrangement shown in Figure 10 has the benefit that the jet pipe is controlled directly by the armature without any intervening mechanical linkage.
Reference is directed to application No.
7233/79 (Serial No. 1568950) which contains claims directed to other features of the above described pilot valve.
WHAT WE CLAIM IS: – 1. A pilot valve comprising a jet pipe for directing a jet of fluid toward a receiver means; said receiver means including three superimposed plates, a first plate having a first opening communicating with a first outlet port of the valve, a second plate having a second opening communicating with a second outlet port of the valve, and a third, splitter, plate intermediate said first and second plates; and control means for moving the jet pipe relative to the openings in response to a control signal whereby said openings receive a differential amount of fluid dependent upon the position of the jet pipe relative to the receiver means.
2. The pilot valve of claim 1, including
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (13)
**WARNING** start of CLMS field may overlap end of DESC **.
ably attached to one end of screw 94.
Screw 94 extends through press nut 95 which is pressed through aperture 96 of frame 51. Screw 94 may be driven by a suitable wrench, such as a hexagonal key wrench, for biasing push rod 21 and armature 70 in a vertical direction.
At the lower end of push rod 21 is bulge 100 which butts against washer 101 which in turn butts against feedback spring 102.
Feedback button 103 may be connected to a suitable feedback mechanism on the servo valve which is being controlled by pilot valve 10 for providing a feedback function. Biasing spring 92 and adjustment s;drew 94 are utilized to center jet tube 49 with respect to splitter plate 33 when no input is supplied to coil 76. Push rod 21 extends through a suitable slot 105 in frame 51.
In operation, with no input signal applied to coil 76, the fluid issuing from jet pipe 19 will be divided by splitter plate 33 to both receiving plates 31 and 32 so that out bt ports 40 and 43 receive equal amounts of fluid. As an input signal is applied to coil 76 of one polarity, armature 70 will be driven up pulling jet pipe 19 up to increase the flaw to outlet port 40 and decrease the flow to outlet port 43. If an opposite polarity signal is supplied to the coil 76, armature 70 is driven downward to correspondingly drive jet pipe 19 down to increase the fluid flow to outlet port 43 and decrease the fluid flow to outlet port 40.
Splitter plate 33 has generally U-shaped retaining arm 110 extending from one side thereof. One leg of U-shaped arm 110 is shorter than its opposite leg and terminates in clip 111. Clip 111 is formed of a Vshaped notch 112 with an aperture 113 at the apex of the V. During assembly clip 111 is bent down until jet pipe 19 snaps into aperture 113. In this manner, jet pipe 19 is retained against lateral motion along the edge of splitter plate 33 facing jet pipe 19 and is allowed only vertical motion across spitter plate 33 and receiver plates 31 and 32.
An alternative pilot valve 200 is shown in Fig. 10 which is basically the same type of construction as that shown in
Figures 1 to 9 but with the jet pipe running through the armature instead of being connected to the armature by pusher 21. Specfically, pilot stage valve 200 has a cover 201 which fits over base section 202 with gasket 203 for sealing. Magnetic arrangement 204 is essentially the same as shown in Figures 1 to 9 but, in Figure 10, is shown in partial cross section. Specifically, magnetic structure 204 comprises a generally U-shaped frame 205 having a bobbin 206 and winding 207 wound therearound. Through a center hole in bobbin 206 is mounted armature 208 attached to frame 205 by bracket 209. Clip 210 is inserted over the end of armature 208 and jet pipe 211 extends through the armature 208 and through base section 202 to chamber 212.Chamber 212 is connected to input port 213 by channel 214. Plug 215 seals chamber 212. The magnetic structure 204 also comprises magnets 216 and 217 with pole pieces 218 and 219. Armature 208 is biased by springs 220 and 221. Spring 220 is adjustable by screw 222 fitted through nut 223. Spring 220 is centered about plate 224 and projection 225. Spring 221 is centered by plate 226 and projection 227. Hydraulic fluid or other fluid is supplied through port 213 to chamber 212 and from there flows through jet pipe 211 and out of jet pipe 211 to receiving section 230.
Receiver section 230 comprises receiver plates 231 and 232 with a splitter plate 233 of the same construction as shown in
Figures 1 to 9. Splitter plate 233 terminates in a clip 234 which secures jet pipe 211 against transverse movement. Receiving section 230 has a cover plate 235 and the entire assembly is fastened to base 202 by screw 236. Channel 237 communicates one of the receiving plates 231 and 232 to an outlet port 238. The other receiving plate is connected in the manner shown in
Figures 1 to 9 to a second output port.
A feedback arrangement may comprise spring 240 hooked over a groove in jet pipe 211, such as groove 24 in jet pipe 19 of
Figure 7, and is attached at its other end to a crank arm 241.
As can be seen, the arrangement shown in Figure 10 has the benefit that the jet pipe is controlled directly by the armature without any intervening mechanical linkage.
Reference is directed to application No.
7233/79 (Serial No. 1568950) which contains claims directed to other features of the above described pilot valve.
WHAT WE CLAIM IS: – 1. A pilot valve comprising a jet pipe for directing a jet of fluid toward a receiver means; said receiver means including three superimposed plates, a first plate having a first opening communicating with a first outlet port of the valve, a second plate having a second opening communicating with a second outlet port of the valve, and a third, splitter, plate intermediate said first and second plates; and control means for moving the jet pipe relative to the openings in response to a control signal whereby said openings receive a differential amount of fluid dependent upon the position of the jet pipe relative to the receiver means.
2. The pilot valve of claim 1, including
means for preventing or restraining the jet pipe from movement in a direction laterally of the controlled movement of the jet pipe.
3. The pilot valve of claim 2 wherein said restraining means is provided by an extension of one of the plates which is secured to the jet pipe.
4. The pilot valve of claim 3, wherein the extension is provided by an integral part of the splitter plate.
5. The pilot valve of claim 3 or 4 wherein the extension is-a snap-fit onto the jet pipe.
6. The pilot valve of claim 5, wherein the extension includes a V-shaped notch admitting to an aperture at the apex of the
V for receiving the jet pipe.
7. The pilot valve of any one of the preceding claims, wherein the control means includes a magnetic operator for moving the jet pipe in response to the control signal.
8. The pilot valve of claim 7 including a push rod joining the jet pipe to the magnetic operator, and wherein the push rod has a flattened section and an aperture in the flattened section for receiving the jet pipe, the jet pipe having a circumferential groove in which the flattened section extends.
9. The pilot valve of claim 7 or 8 wherein the magnetic operator includes a generally U-shaped frame; a first rare earthcobalt magnet attached to one arm of the frame; a second rare earth-cobalt magnet attached to the other arm of the frame; an armature attached at one end to the bight of the frame, the other end thereof extending between the magnets; and a coil means wound round the armature.
10. The pilot valve of claim 9, wherein the coil means comprises a bobbin inserted over the armature and a coil wound around the bobbin.
11. The pilot valve of claim 9 or 10 as appendant to claim 8 wherein the armature is a snap fit onto the push rod.
12. The pilot valve of claim 7, wherein the magnetic operator includes a hollow armature through which the jet pipe extends.
13. A pilot valve substantially as herein described with reference to Figures 1 to 9 or Figure 10 of the accompanying drawings.
GB17346/78A
1977-05-13
1978-05-03
Servo pilot valve
Expired
GB1568949A
(en)
Applications Claiming Priority (2)
Application Number
Priority Date
Filing Date
Title
US05/796,650
US4291716A
(en)
1977-05-13
1977-05-13
Pilot stage valve
US79716277A
1977-05-16
1977-05-16
Publications (1)
Publication Number
Publication Date
GB1568949A
true
GB1568949A
(en)
1980-06-11
Family
ID=27121763
Family Applications (2)
Application Number
Title
Priority Date
Filing Date
GB17346/78A
Expired
GB1568949A
(en)
1977-05-13
1978-05-03
Servo pilot valve
GB7322/79A
Expired
GB1568950A
(en)
1977-05-13
1978-05-03
Servo pilot valve
Family Applications After (1)
Application Number
Title
Priority Date
Filing Date
GB7322/79A
Expired
GB1568950A
(en)
1977-05-13
1978-05-03
Servo pilot valve
Country Status (4)
Country
Link
DE
(1)
DE2820333A1
(en)
FR
(1)
FR2390606A1
(en)
GB
(2)
GB1568949A
(en)
SE
(1)
SE7805495L
(en)
Families Citing this family (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2123185B
(en)
*
1982-07-02
1985-07-24
Dowty Hydraulic Units Ltd
Electro-hydraulic servo valves
US5012836A
(en)
*
1990-01-31
1991-05-07
Sarcos Group
Servovalve apparatus for use in fluid systems
US5005600A
(en)
*
1990-01-31
1991-04-09
Sarcos Group
Servovalve apparatus for use in fluid systems
1978
1978-05-03
GB
GB17346/78A
patent/GB1568949A/en
not_active
Expired
1978-05-03
GB
GB7322/79A
patent/GB1568950A/en
not_active
Expired
1978-05-10
DE
DE19782820333
patent/DE2820333A1/en
not_active
Withdrawn
1978-05-12
FR
FR7814223A
patent/FR2390606A1/en
not_active
Withdrawn
1978-05-12
SE
SE7805495A
patent/SE7805495L/en
unknown
Also Published As
Publication number
Publication date
GB1568950A
(en)
1980-06-11
DE2820333A1
(en)
1978-11-23
SE7805495L
(en)
1978-11-14
FR2390606A1
(en)
1978-12-08
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Legal Events
Date
Code
Title
Description
1980-08-28
PS
Patent sealed
1982-12-01
PCNP
Patent ceased through non-payment of renewal fee
