GB1570445A – Heat shield
– Google Patents
GB1570445A – Heat shield
– Google Patents
Heat shield
Download PDF
Info
Publication number
GB1570445A
GB1570445A
GB4606177A
GB4606177A
GB1570445A
GB 1570445 A
GB1570445 A
GB 1570445A
GB 4606177 A
GB4606177 A
GB 4606177A
GB 4606177 A
GB4606177 A
GB 4606177A
GB 1570445 A
GB1570445 A
GB 1570445A
Authority
GB
United Kingdom
Prior art keywords
air
walls
apertures
source
wall
Prior art date
1976-12-13
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
GB4606177A
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.)
Luchaire SA
Original Assignee
Luchaire SA
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.)
1976-12-13
Filing date
1977-11-04
Publication date
1980-07-02
1977-11-04
Application filed by Luchaire SA
filed
Critical
Luchaire SA
1980-07-02
Publication of GB1570445A
publication
Critical
patent/GB1570445A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 – F01N5/00, F01N9/00, F01N11/00
F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 – F01N5/00, F01N9/00, F01N11/00 having thermal insulation
F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 – F01N5/00, F01N9/00, F01N11/00
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
F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
F16L59/00—Thermal insulation in general
F16L59/06—Arrangements using an air layer or vacuum
F16L59/07—Arrangements using an air layer or vacuum the air layer being enclosed by one or more layers of insulation
Description
(54) HEAT SHIELD
(71) We, LUCHAIRE S.A., a French
Body Corporate, of 180 Boulevard Haussmann, 75008 Paris, France, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method which it is to be performed, to be particularly described in and by the following statement:- In many branches of industry, for example with regard to land, sea or air vehicles, in factories, in buildings, it is often necessary to protect an object from the effects of a source of heat which has to be situated close to said object. This is the problem which arises, for example, in protecting an apparatus, a body member, a piece of furniture, high pressure pipes, etc., from the heat emitted by exhaust pipes, steam pipes or fireplaces.
The essential object of the present invention is to create a device which enables this problem to be solved.
According to the invention there is provided a device for the protection of an object from the effects of a source of heat comprising a screen disposed between said object and said source and pierced with apertures permitting the circulation of air, characterised in that said screen is formed by at least two parallel walls spaced apart from one another, the apertures being distributed between the said walls in such a manner as to allow air to penetrate between them and to escape to the outside, the two walls each having at least one rising portion in which the apertures are offset in height from one wall to the other in such a manner as to encourage a rising air circulation.
As a result of this arrangement there is established between the source and the screen, inside this, and between the screen and the object to be protected, a complex circulation of air which is intensified in some circumstances by a relative movement in relation to the air, for example when applied to vehicles or in the case of a forced circulation of air.
The following description, with reference to the accompanying drawings, given by way of non-limitmg example, will explain how the invention can be carried out, the particulars which appear both from the drawings and from the text naturally forming part of said invention.
Figure 1 is a view in elevation of a device according to the invention, enabling the body of a vehicle to be protected from the heat emitted by a transverse exhaust silencer.
Figure 2 is a section on II-II of Figure 1.
Figure 3 is a detail section on III-III of
Figure 2.
Figure 4 is a plan view of a modification in which the silencer is longitudinal.
Figure 5 is a section through V-V of Figure 4.
In the example of embodiment of the invention illustrated in Figures 1 to 3, it is a question of protecting a wall 2 of the body of a vehicle from the effects of an exhaust silencer 1 of a motor vehicle or any other equivalent source of heat, for example an antipollution reactor. The silencer 1 if fixed, by means of fastenings 3, to the chassis 4 transversely to the direction of travel and the wall 2 is situated a few centimetres behind the silencer, substantially vertically.
The temperature of the silencer may reach values of the order of 580″C and the temperature of the wall must remain below 80″C even if the vehicle is stopped.
According to the invention, a protective device 5, which is fixed to the chassis of the vehicle by means of screws 6 and fastenings 7, is interposed between the source of heat consisting of the silencer and the wall to be protected.
The device 5 forms, in front of the wall 2, a screen which is wider and longer than the silencer which it masks completely, as Fig ure 1 shows. In elevation, it has substantially the shape of an isosceles trapezium, the large base of which is situated at the bottom and the angles of which are rounded.
It consists of two walls 8 and 9 of sheet metal. each comprising: a central portion of substantially plane shape, but slightly curved in plan. as can be seen in Figure 2; an upper flange 10 or 11 bent at right angles and a lower edge 12 or 13 slightly raised in the direction of travel of the vehicle. The front edge 12 stops at a slightly higher level than that of the rear edge 13.
The walls 8 and 9 are held substant:ally parallel, on the one hand by welding the flanges 10 and 11 to an upper cross member 14 which carries the fixing screws 6 and, on the other hand. by welding to the fastenings 7. as well as by means of slits 15 formed from laminatioils with parallel edges cut horizontally out of the front wall 8 and pressed into the shape of a trapezium to come into contact with the rear wall 9 to which they are spot welded, as Figure 3 shows.
Three series of slits 15 are distributed in staggered arrangement over the central portion of the walls 8 and 9 (Figure 1).
In addition, the wall 8 comprises, substantially at two thirds of its height, a horizontal series of equidistant elongated apertures 16, separated by a distance a little shorter than their length, the wall 9 being pierced by apertures 17 situated at a slightly higher level than that of the apertures 16.
The apertures 17 have the same length as the apertures 16 and are arranged like these but they have a greater height, for example double that of the apertures 16.
The protection device which has just been described works as follows.
Under the effect of the heat emitted by the silencer 1, a complex rising flow of air develops, even when the vehicle is at a standstill, between the silencer 1 and the front wall 8, between the two walls 8 and 9 and between the rear wall 9 and the wall 2 to be protected.
The air which rises between the silencer and the wall 8 essentially leaves in front of the cross member 14 but some of this air passes between the two walls through the bottom slits 15 and through the apertures 16 to mix with the current of air which rises between the walls 8 and 9 then to leave through the apertures 17 and the upper slits 15 and to mix either with the front current which passes in front of the cross member 14 or with the rear current which passes between the wall 9 and the wall 2 to escape upwards.
When the vehicle is travelling, a dynamic suction and siphon effect is added to this and accelerates the circulation of the air, the presence and the arrangement of the slits 15 and of the apertures intensifying the mixing of the three currents of air which penetrate from below into the assembly formed by the silencer, the protection device and the wall 2.
Tests carried out on the bench. with an ambient temperature of 20 C, the vehicle being stationary and the outside temperature of the silencer being 575″C, enabled the temperature of the wall 2 to be stabilized at less than 80″C. even at the end of half an hour of operation.
The modification of Figures 4 and 5 is similar, in its broad outline, to the form of embodiment which has just been described.
Again it relates to a motor vehicle but this time the silencer or other source of heat 1 is disposed longitudinally below the floor 2 of the body which has to be kept at a temperature below 60-80″C. The vehicle is displaced in the direction of the arrowfin Figure 4.
The gases reach the silencer through a pipe 20 and leave it through a pipe 21.
This time. the protection device against the heat comprises, below the wall 2, a casing 22 having a section in the form of an inverted trough and with a double wall, which covers the silencer and the pipes 20 and 21 at a distance, approximately following their apparent contour as Figure 4 shows.
The two walls 23 and 24 of the casing are held with the required spacing by distance pieces 15. The edge 25 of the lower wall is situated lower than the edge 26 of the upper wall in such a manner as to encourage the entrance of air under the effect of the speed of the vehicle.
Apart from the distance-pieces 15, louvre slits are formed in the two walls forming air inlets.
The slits 27 and 28 of the lower wall are situated respectively behind the slits 29 and 30 of the upper wall, the slits 27 and 29 being made transversely to the direction of travel in the upper portion of the casing, while the slits 28 and 30 are orientated longitudinally and formed in the sides of the casing at different heights, the slits 28 being situated higher than the slits 30. Furthermore, the slits 27 and 29 open from the bottom upwards, towards the front, as can be seen in Figure 5, the slits 28 and 30 opening at the bottom of the outside towards the silencer or the pipe.
The protection device works in a similar manner to that which was described with reference to Figures 1 to 3, that is to say with the creation of a triple current of air between the hot source 1, 20, 21 and the wall 23, between the walls 23 and 24 and between the wall 24 and the object 2 to be protected, the presence of the slits forming distance-pieces and air inlets ensuring a mixing of the currents and their acceleration by dynamic suction and siphon effect when the air is in movement in relation to the device, in this case when the vehicle is displaced.
WHAT WE CLAIM IS: 1. A device for the protection of an object from the effects of a source of heat comprising a screen disposed between said object and said source and pierced with apertures permitting the circulation of air.
characterised in that said screen is formed by at least two parallel walls spaced apart from one another. the apertures being distributed between the said walls in such a manner as to allow air to penetrate between them and to escape to the outside, the two walls each having at least one rising portion in which the apertures are offset in height from one wall to the other in such a manner as to encourage a rising air circulation.
2. A device as claimed in claim 1, adapted to be combined with a source of heat and an object which can be set in relative motion in relation to the air, characterised in that the space comprised between the walls is open in the direction of arrival of the air.
3. A device as claimed in claim 2, characterised in that the apertures in the walls are offset from one wall to the other, in the direction of circulation of the air.
4. A device as claimed in any one of the clainis 1 to 3, adapted to protect a portion of a vehicle from the heat emitted by a transverse source, characterised in that the two walls are disposed substantially vertically one behind the other on the vehicle, the lower edge of the rear wall being lower than that of the front wall. these edges being raised in the direction of arrival of the air.
5. A device as claimed in any one of the claims 1 to 3, adapted to protect a portion of a vehicle from the heat emitted by a longitudinal source of heat, characterised in that the two walls form a casing which substantially corresponds to the shape of the source.
6. A device as claimed in claim 5, characterised in that the casing has a crosssection in the form of an inverted trough.
7. A device as claimed in claim 6, characterised in that some of the apertures consist of slits in the form of louvres.
8. A device as claimed in any one of the claims 1 to 7. characterised in that some of the apertures consist of slits serving as distance-pieces between the two walls.
9. A heat shield substantially as hereinbefore described with reference to any of the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (9)
**WARNING** start of CLMS field may overlap end of DESC **. air is in movement in relation to the device, in this case when the vehicle is displaced. WHAT WE CLAIM IS:
1. A device for the protection of an object from the effects of a source of heat comprising a screen disposed between said object and said source and pierced with apertures permitting the circulation of air.
characterised in that said screen is formed by at least two parallel walls spaced apart from one another. the apertures being distributed between the said walls in such a manner as to allow air to penetrate between them and to escape to the outside, the two walls each having at least one rising portion in which the apertures are offset in height from one wall to the other in such a manner as to encourage a rising air circulation.
2. A device as claimed in claim 1, adapted to be combined with a source of heat and an object which can be set in relative motion in relation to the air, characterised in that the space comprised between the walls is open in the direction of arrival of the air.
3. A device as claimed in claim 2, characterised in that the apertures in the walls are offset from one wall to the other, in the direction of circulation of the air.
4. A device as claimed in any one of the clainis 1 to 3, adapted to protect a portion of a vehicle from the heat emitted by a transverse source, characterised in that the two walls are disposed substantially vertically one behind the other on the vehicle, the lower edge of the rear wall being lower than that of the front wall. these edges being raised in the direction of arrival of the air.
5. A device as claimed in any one of the claims 1 to 3, adapted to protect a portion of a vehicle from the heat emitted by a longitudinal source of heat, characterised in that the two walls form a casing which substantially corresponds to the shape of the source.
6. A device as claimed in claim 5, characterised in that the casing has a crosssection in the form of an inverted trough.
7. A device as claimed in claim 6, characterised in that some of the apertures consist of slits in the form of louvres.
8. A device as claimed in any one of the claims 1 to 7. characterised in that some of the apertures consist of slits serving as distance-pieces between the two walls.
9. A heat shield substantially as hereinbefore described with reference to any of the accompanying drawings.
GB4606177A
1976-12-13
1977-11-04
Heat shield
Expired
GB1570445A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
FR7637452A
FR2373747A1
(en)
1976-12-13
1976-12-13
HEAT PROTECTION DEVICE
Publications (1)
Publication Number
Publication Date
GB1570445A
true
GB1570445A
(en)
1980-07-02
Family
ID=9180973
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB4606177A
Expired
GB1570445A
(en)
1976-12-13
1977-11-04
Heat shield
Country Status (5)
Country
Link
DE
(1)
DE2749193A1
(en)
ES
(1)
ES465314A1
(en)
FR
(1)
FR2373747A1
(en)
GB
(1)
GB1570445A
(en)
IT
(1)
IT1091483B
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2276543A
(en)
*
1993-03-31
1994-10-05
Mech Tool Engineering Ltd
Radiant heat shield
Families Citing this family (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE19635870C2
(en)
*
1996-09-04
2002-05-16
Daimler Chrysler Ag
exhaust manifold
Family Cites Families (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
IT956949B
(en)
*
1971-07-28
1973-10-10
Boysen Friedrich Kg
TUBULAR DUCT FOR HOT VEHICLES EQUIPPED WITH A THERMALLY INSULATING CASE IN PARTICULAR THERMAL REACTOR INSERTED IN THE EXHAUST GAS DUCTS OF INTERNAL COMBUSTION OR SIMILAR ENGINES
US3948295A
(en)
*
1972-07-17
1976-04-06
Summa Corporation
Insulation system
1976
1976-12-13
FR
FR7637452A
patent/FR2373747A1/en
active
Granted
1977
1977-11-03
DE
DE19772749193
patent/DE2749193A1/en
not_active
Ceased
1977-11-04
GB
GB4606177A
patent/GB1570445A/en
not_active
Expired
1977-11-17
IT
IT6960977A
patent/IT1091483B/en
active
1977-12-09
ES
ES465314A
patent/ES465314A1/en
not_active
Expired
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2276543A
(en)
*
1993-03-31
1994-10-05
Mech Tool Engineering Ltd
Radiant heat shield
GB2276543B
(en)
*
1993-03-31
1996-11-27
Mech Tool Engineering Ltd
Radiant heat shield
Also Published As
Publication number
Publication date
FR2373747A1
(en)
1978-07-07
ES465314A1
(en)
1978-09-16
DE2749193A1
(en)
1978-06-15
FR2373747B1
(en)
1981-07-24
IT1091483B
(en)
1985-07-06
Similar Documents
Publication
Publication Date
Title
US4164989A
(en)
1979-08-21
Muffler, especially for portable internal combustion engine
CA1071537A
(en)
1980-02-12
Muffler for portable power chain-saws and the like
US2741972A
(en)
1956-04-17
Roof jack for ventilating duct
DE3264089D1
(en)
1985-07-11
Radial ventilator with backwards-curved profiled blades
ATE47626T1
(en)
1989-11-15
AIR OUTLET DEVICE FOR AIR CONDITIONING SYSTEMS.
US4428447A
(en)
1984-01-31
Vehicle front end structure
US3049069A
(en)
1962-08-14
Fume hood
KR970006118A
(en)
1997-02-19
Method and apparatus for reducing gas air noise
IT1042131B
(en)
1980-01-30
DEFLECTOR FOR THE REDUCTION OF THE NOISE PROPAGATION IN THE CONDUCT OF INLETING A GAS TURBINE ENGINE
GB1570445A
(en)
1980-07-02
Heat shield
US3385198A
(en)
1968-05-28
Air flow directing and protective grill
US3941039A
(en)
1976-03-02
Cooking fume removal
RU2449150C1
(en)
2012-04-27
Bypass gas turbine engine with low noise level for aircraft
US3940097A
(en)
1976-02-24
Exhaust flow deflector
US4153036A
(en)
1979-05-08
Fireplace construction
US2790377A
(en)
1957-04-30
Wall cap for ventilating duct
US6560936B2
(en)
2003-05-13
Aircraft engine run-up hangar
US2930650A
(en)
1960-03-29
Glare shield for motor vehicles
US3785405A
(en)
1974-01-15
Aerodynamic nozzles in rectangular duct
ES292293A1
(en)
1964-02-16
Corrugated translucent sheets and means securing the same
CN108136974B
(en)
2021-06-22
Assembly for a motor vehicle chassis
US3379575A
(en)
1968-04-23
Battery having a cover member for a plurality of vented battery caps
GB1601953A
(en)
1981-11-04
Burner bar for the combustion of a mixture of air and a gas
ES356309A1
(en)
1970-01-16
Improvements in the construction of chapa fans. (Machine-translation by Google Translate, not legally binding)
US2727782A
(en)
1955-12-20
Insect deflector for automobiles
Legal Events
Date
Code
Title
Description
1980-09-17
PS
Patent sealed
1991-07-03
PCNP
Patent ceased through non-payment of renewal fee
