CN111927609A

CN111927609A - Heat shield

Info

Publication number: CN111927609A
Application number: CN202010920706.5A
Authority: CN
Inventors: 黎光福; 牛胜福; 李国富; 陈领平; 石中光; 戴西槐; 张伟; 刘立朝; 张孙华; 王震
Original assignee: Shanghai Yuancheng Automobile Technology Co Ltd
Current assignee: Shanghai Yuancheng Automobile Technology Co Ltd
Priority date: 2020-09-04
Filing date: 2020-09-04
Publication date: 2020-11-13

Abstract

The invention discloses a heat shield, and belongs to the technical field of engines. The heat shield comprises a heat shield body and a nozzle, wherein the heat shield body is sleeved outside a heat source part, an area between the heat shield body and the heat source part is an air area, one end of the air area is an air inlet, and the other end of the air area is an air outlet; the nozzle is fixed on the heat shield body and used for guiding outside air into the air zone, the nozzle comprises an air inlet end and an air outlet end, the air outlet end is communicated with the air zone, the air outlet end faces the air outlet, the nozzle is of a necking structure, and the diameter of the air outlet end is smaller than that of the air inlet end. The heat shield can passively insulate heat, so that the heat generated by the heat source part is reduced to be transferred outwards; and active directional heat dissipation can be realized, so that the hot dipping working condition is avoided, and the heat dissipation requirement of the heat source part is met.

Description

Heat shield

Technical Field

The invention relates to the technical field of engines, in particular to a heat shield.

Background

With the development of automobile technology, the arrangement of the engine room of the vehicle is more and more compact, and particularly, a hybrid vehicle is provided with a transmission engine, a motor and an electronic water pump, so that a large number of low-temperature-resistant parts such as rubber pipes, wire harnesses and plastic parts are used. The temperature of parts of an engine exhaust system can reach 900 ℃ or above, which greatly threatens the safety of peripheral parts, so that heat insulation treatment is required to be carried out on heat source parts such as engine exhaust and the like.

The attached heat exchanger that separates of automobile engine exhaust system mainly contains at present: exhaust manifold heat shields, supercharger heat shields, and catalyst heat shields. The heat insulation principle of the existing heat shield is passive heat insulation, generally, the heat shield is of a thin steel plate sandwich heat insulation cotton structure, a reflecting layer is electroplated on the surface of an inner side steel plate, heat source parts are prevented from radiating and radiating outwards, and meanwhile, the heat source parts are reduced from conducting and radiating outwards by improving the performance of sandwich heat insulation cotton. However, the existing heat shield neglects the heat dissipation requirement of the heat source part, heat accumulation of the heat source part is easily caused, the temperature of the heat source part is greatly increased, and finally the heat shield cannot effectively insulate heat, so that the heat shield heat insulation effect is poor or even fails. In addition, existing heat shields may not provide protection from heat hazards under certain extreme conditions, such as hot dip conditions. The hot dipping working condition is a relatively extreme severe working condition, particularly when an automobile stops immediately when an engine is hot, air circulation between the heat shield and the heat source part is insufficient, heat in the engine room is accumulated, the temperature of parts around the heat source part rises rapidly, and finally the parts are damaged.

Therefore, there is a need for a heat shield combining active directional heat dissipation and passive heat insulation to solve the above technical problems in the prior art.

Disclosure of Invention

The invention aims to provide a heat shield which can reduce the outward transfer of heat generated by a heat source part through passive heat insulation; and active directional heat dissipation can be realized, so that the hot dipping working condition is avoided, and the heat dissipation requirement of the heat source part is met.

In order to achieve the purpose, the invention adopts the following technical scheme:

a heat shield, comprising:

the heat shield comprises a heat shield body, wherein the heat shield body is sleeved outside a heat source part, an area between the heat shield body and the heat source part is an air area, one end of the air area is an air inlet, and the other end of the air area is an air outlet;

the nozzle is fixed on the heat shield body and used for guiding outside air into the air zone, the nozzle comprises an air inlet end and an air outlet end, the air outlet end is communicated with the air zone, the air outlet end faces the air outlet, the nozzle is of a necking structure, and the diameter of the air outlet end is smaller than that of the air inlet end.

As a preferred technical scheme of the heat shield, the nozzle comprises a horizontal straight pipe section and a vertical straight pipe section which are connected with each other, the port of the horizontal straight pipe section is the gas inlet end, the port of the vertical straight pipe section is the gas outlet end, and the horizontal straight pipe section is fixedly connected to the heat shield body.

As a preferred technical solution of the heat shield, the heat shield further includes a fixing assembly for fixing the nozzle to the heat shield body.

As a preferred aspect of the heat shield, the fixing member includes:

the first fixing seat comprises a first through hole, a mounting hole is formed in the heat shield body, the first fixing seat is mounted and welded in the mounting hole, the nozzle can penetrate through the first through hole, a first stopping structure is arranged on the nozzle, and one side of the first stopping structure abuts against the end wall, located outside the heat shield body, of the first fixing seat;

the second fixing seat is sequentially sleeved outside the nozzle and the first fixing seat, a second stopping structure is arranged on the second fixing seat, the second stopping structure is abutted to the other side of the first stopping structure, and the second fixing seat is detachably connected to the first fixing seat.

As a preferred technical scheme who separates the heat exchanger, be provided with the external screw thread on the first fixing base, be provided with the internal thread on the second fixing base, second fixing base threaded connection in on the first fixing base.

As a preferred embodiment of the heat shield, the gas inlet end is connected to a compressed air tank or an air compressor.

As a preferred technical solution of the heat shield, the heat shield further comprises a switch valve, and the switch valve is connected between the gas inlet end and the compressed air bottle; or

The switching valve is connected between the gas inlet end and the air compressor.

As a preferred technical scheme of the heat shield, the switch valve is a normally closed two-way electromagnetic valve.

As a preferred technical scheme of the heat shield, the heat shield body comprises a first steel plate, a ceramic fiber layer and a second steel plate from inside to outside.

As a preferred technical scheme of the heat shield, a plurality of nozzles are uniformly arranged on the heat shield body in the circumferential direction.

The invention provides a heat shield which comprises a heat shield body and a nozzle, wherein the heat shield body is sleeved outside a heat source part, and the heat shield body realizes the passive heat insulation function of the heat shield by preventing the heat source part from transferring heat outwards; the area between the heat shield body and the heat source part is an air area, one end of the air area is an air inlet, the other end of the air area is an air outlet, and in the driving process of a vehicle, the air flow in the vehicle can drive the air in the air area to circulate with the air in the external environment, so that the heat dissipation of the heat source part is realized, but the clearance between the heat shield body and the heat source part in the traditional vehicle is very small, so that the convection intensity of the air in the air area is small in the driving process of the vehicle, and the heat dissipation requirement of the heat source part cannot be met. The convection strength of air in the air zone is further enhanced by means of active directional heat dissipation of forced convection, so that the heat dissipation requirement of the heat source parts is met, the hot dipping working condition can not occur even if the vehicle stops under the condition that the engine is very hot, and the damage of the heat source parts due to over-temperature is avoided.

Drawings

FIG. 1 is a schematic diagram of the structure of a heat shield, heat source components and a compressed air tank according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a heat shield portion according to an embodiment of the present invention.

Reference numerals:

100. a heat source component; 200. an air zone; 300. a compressed air tank;

1. a heat shield body; 2. a nozzle; 21. a gas inlet end; 22. a gas outlet end; 23. a first stop structure; 3. a fixing assembly; 31. a first fixed seat; 32. a second fixed seat; 321. a second stop structure; 4. and (5) opening and closing the valve.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1 and 2, the present embodiment provides a heat shield, which includes a heat shield body 1 and a nozzle 2, wherein the heat shield body 1 is sleeved outside the heat source part 100, an area between the heat shield body 1 and the heat source part 100 is an air region 200, one end of the air region 200 is an air inlet, and the other end is an air outlet; the nozzle 2 is fixed on the heat shield body 1 and used for guiding outside air into the air area 200, the nozzle 2 comprises an air inlet end 21 and an air outlet end 22, the air outlet end 22 is communicated with the air area 200, the air outlet end 22 faces the air outlet, the nozzle 2 is in a necking structure, and the diameter of the air outlet end 22 is smaller than that of the air inlet end 21.

The heat shield body 1 is sleeved outside the heat source part 100, and the heat shield body 1 prevents the heat source part 100 from transferring heat outwards, so that the passive heat insulation function of the heat shield is realized. The area between the heat shield body 1 and the heat source part 100 is an air area 200, one end of the air area 200 is an air inlet, and the other end of the air area 200 is an air outlet, in the driving process of the vehicle, the air in the air area 200 and the air in the external environment can be driven to circulate by the flowing of the air flow in the vehicle, so that the heat dissipation of the heat source part 100 is realized, but the clearance between the heat shield body 1 and the heat source part 100 in the traditional vehicle is very small, generally 5 mm-8 mm, so that the convection strength of the air in the air area 200 in the driving process of the vehicle is small, and the heat dissipation requirement of the heat source part 100 cannot be met. In the embodiment, the nozzle 2 is arranged on the heat shield body 1, compressed air enters the air area 200 through the nozzle 2, the gas outlet end 22 of the nozzle 2 is arranged towards the air outlet of the air area 200, the nozzle 2 is of a necking structure with the diameter of the gas outlet end 22 smaller than that of the gas inlet end 21, the flow speed of the air is rapidly increased when the air flows in the flow channel, namely, the conversion of pressure energy to kinetic energy is completed in the nozzle 2, the air which is ejected at high speed is called injection fluid, the air flow beam of the air is rapidly and transversely turbulent and diffused at the instant of ejection, and carries out momentum exchange with the air around the air area 200 and carries away the air, so that vacuum is formed around and behind the nozzle 2, the rapid supplement of the air behind and around is attracted, finally, the air in the air area 200 is completely mixed with the injection air to realize kinetic energy conversion, the air flows towards the appointed direction, and the active, the convection strength of the air in the air zone 200 is further enhanced, so that the heat dissipation requirement of the heat source part 100 is met, a hot dipping working condition can not occur even if the vehicle stops under the condition that the engine is very hot, and the heat source part 100 is prevented from being damaged due to over-temperature.

It should be noted that, the heat shield in this embodiment can form a larger amount of heat dissipation airflow than the amount of air formed by natural convection and a larger amount of heat to be taken away by reasonably designing the installation position and direction of the nozzle 2, thereby ensuring the heat dissipation requirement of the heat source part 100 itself, avoiding the temperature rise of the heat source part 100 due to heat accumulation, and also avoiding the damage of the heat source part 100 itself due to over-temperature.

Alternatively, in other embodiments, the number, the installation position, and the installation angle of the nozzles 2 may be flexibly designed according to the actual heat dissipation requirement, so as to improve the convection heat dissipation capacity of the heat source part 100 itself. Preferably, in the present embodiment, the heat shield body 1 is uniformly provided with a plurality of nozzles 2 in the circumferential direction. The heat shield provided by the embodiment reduces the temperature of the heat source part 100, and simultaneously reduces the difficulty of heat damage protection and the cost of heat insulation of the heat shield body 1 by adopting expensive materials; when the conventional heat shield does not meet the expected heat shield requirement, the structure of the heat shield in the embodiment or the structure of the nozzle 2 in the embodiment can be adopted, and the structure of the nozzle 2 in the embodiment is suitable for being additionally arranged on various heat shields so as to realize the function of active directional heat dissipation of the heat shield.

Preferably, the nozzle 2 comprises a horizontal straight pipe section and a vertical straight pipe section which are connected with each other, the port of the horizontal straight pipe section is a gas inlet end 21, the port of the vertical straight pipe section is a gas outlet end 22, the horizontal straight pipe section is fixedly connected to the heat shield body 1, and the vertical straight pipe section where the gas outlet end 22 is located can be adjusted in angle, so that the air spraying angle is adjusted, high-temperature air in the air area 200 avoids fragile parts as much as possible in the flowing process, and the parts are prevented from being damaged. Alternatively, in other embodiments, the nozzle 2 may be designed according to the flow field requirement of the actual air zone 200, and may have other shapes and installation angles, so as to meet the heat dissipation requirement of the heat source component 100 itself by taking away the heat in the air zone 200 with the maximum efficiency. Preferably, in the present embodiment, the nozzle 2 adopts a pier structure, and the housing at the reducing start position is designed to be in an outward bulging pier structure.

Alternatively, the nozzle 2 may be welded directly to the heat shield body 1, or the heat shield may further include a fastening assembly 3, the fastening assembly 3 being used to fasten the nozzle 2 to the heat shield body 1.

As shown in fig. 2, the fixing assembly 3 includes a first fixing seat 31 and a second fixing seat 32, wherein the first fixing seat 31 includes a first through hole, a mounting hole is formed in the heat shield body 1, the first fixing seat 31 is mounted and fixed in the mounting hole, the nozzle 2 can pass through the first through hole, the circumferential outer surface of the horizontal straight pipe section abuts against the first fixing seat 31, the vertical straight pipe section extends into the air zone 200, the gas outlet end 22 of the vertical straight pipe section faces the air outlet direction of the air zone 200, a worker can mark the nozzle 2 to adjust the gas outlet end 22 of the nozzle 2 to face the air outlet direction of the air zone 200, a first stopping structure 23 is arranged on the nozzle 2, and one side of the first stopping structure 23 abuts against the end wall of the first fixing seat 31 located outside the heat shield body 1; outside nozzle 2 and first fixing base 31 were located to the cover in proper order of second fixing base 32, be provided with the second through-hole on the second fixing base 32, thereby the horizontal straight tube section can stretch out outside the second through-hole and realize the gaseous entrance point 21 on the horizontal straight tube section and outside compressed air intercommunication, be provided with second backstop structure 321 on the second fixing base 32, second backstop structure 321 butt in the opposite side of first backstop structure 23, second fixing base 32 can be dismantled and connect on first fixing base 31. Preferably, the first fixing seat 31 is fixed in the mounting hole by spot welding. It should be noted that the connection between the first fixing seat 31 and the edge of the mounting hole does not need to be completely sealed, which reduces the complexity of welding. Preferably, second fixing base 32 is gland nut, and gland nut can purchase standard union nut, reduces the degree of difficulty of production and processing. It should be noted that, the department of connecting horizontal straight tube section and first fixing base 31 can be polished with the coarse sand paper in order to increase the frictional force of nozzle 2 and first fixing base 31 butt, improves the steadiness of connecting.

Preferably, an external thread is disposed on the first fixing seat 31, an internal thread is disposed on the second fixing seat 32, and the second fixing seat 32 is screwed on the first fixing seat 31. Alternatively, in other embodiments, threaded holes may be formed in the first fixing seat 31 and the second fixing seat 32, and fixing members, such as screws, may be inserted through the threaded holes in the first fixing seat 31 and the second fixing seat 32 to detachably connect the first fixing seat 31 and the second fixing seat 32. Preferably, in the present embodiment, the external thread on the first fixing seat 31 and the internal thread on the second fixing seat 32 are both fine threads.

Alternatively, the gas inlet port 21 is connected to a compressed air tank 300 or an air compressor. The compressed air tank 300 can be an original compressed air tank of the vehicle, and the cost of the whole vehicle is reduced. Since the compressed air can be output from the compressed air tank 300, when the vehicle is rapidly parked in a hot state, the convective heat dissipation can be continuously operated for a period of time after parking, and thus the hot dipping problem can be effectively solved. Alternatively, the circumferential outer surface of the gas outlet port 22 is processed to be smooth for direct connection with a rubber tube, or the circumferential outer surface of the gas outlet port 22 is processed to be fine-toothed external threads for connection with a metal adapter tube.

As shown in fig. 1, the heat shield further comprises a switch valve 4, and the switch valve 4 is connected between the gas inlet end 21 and the compressed air bottle 300; or on-off valve 4 is connected between the gas inlet port 21 and the air compressor. Preferably, in the present embodiment, the switching valve 4 is a normally closed two-way solenoid valve. The switch valve 4 is opened only under some extreme working conditions, so that the consumption of compressed air can be reduced; or the switch valve 4 is normally opened, and the selection is carried out according to the heat dissipation requirement of the actual heat source part 100.

Alternatively, the heat shield body 1 may be an exhaust manifold heat shield, a catalyst heat shield, a turbocharger heat shield, or the like. Preferably, in the present embodiment, the heat shield body 1 includes a first steel plate, a ceramic fiber layer, and a second steel plate from the inside to the outside, and the first steel plate and the second steel plate are aluminum-plated thin steel plates. Alternatively, in other embodiments, other materials may be used for the heat shield body 1.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims

1. A heat shield, comprising:

the heat shield comprises a heat shield body (1), wherein the heat shield body (1) is sleeved outside a heat source part (100), an area between the heat shield body (1) and the heat source part (100) is an air area (200), one end of the air area (200) is an air inlet, and the other end of the air area is an air outlet;

the nozzle (2) is fixed on the heat shield body (1) and used for introducing outside air into the air area (200), the nozzle (2) comprises an air inlet end (21) and an air outlet end (22), the air outlet end (22) is communicated with the air area (200), the air outlet end (22) faces the air outlet, the nozzle (2) is of a necking structure, and the diameter of the air outlet end (22) is smaller than that of the air inlet end (21).

2. A heat shield according to claim 1, wherein the nozzle (2) comprises a horizontal straight tube section and a vertical straight tube section connected to each other, the horizontal straight tube section being ported to the gas inlet end (21) and the vertical straight tube section being ported to the gas outlet end (22), the horizontal straight tube section being fixedly connected to the heat shield body (1).

3. The heat shield according to claim 1, characterized in that it further comprises a fixing assembly (3) for fixing the nozzle (2) to the heat shield body (1).

4. The heat shield according to claim 3, characterized in that said fixing assembly (3) comprises:

the first fixing seat (31) comprises a first through hole, a mounting hole is formed in the heat shield body (1), the first fixing seat (31) is installed and welded in the mounting hole, the nozzle (2) can penetrate through the first through hole, a first stopping structure (23) is arranged on the nozzle (2), and one side of the first stopping structure (23) abuts against the end wall, located outside the heat shield body (1), of the first fixing seat (31);

second fixing base (32), second fixing base (32) overlap in proper order and locate nozzle (2) with outside first fixing base (31), be provided with second backstop structure (321) on second fixing base (32), second backstop structure (321) butt in the opposite side of first backstop structure (23), second fixing base (32) can dismantle connect in on first fixing base (31).

5. The heat shield according to claim 4, characterized in that the first fastening seat (31) is provided with an external thread and the second fastening seat (32) is provided with an internal thread, the second fastening seat (32) being screwed onto the first fastening seat (31).

6. The heat shield according to claim 1, wherein the gas inlet port (21) is connected to a compressed air bottle (300) or an air compressor.

7. The heat shield according to claim 6, further comprising a switch valve (4), said switch valve (4) being connected between said gas inlet end (21) and said compressed air tank (300); or

The switching valve (4) is connected between the gas inlet end (21) and the air compressor.

8. Heat shield according to claim 7, characterized in that the switching valve (4) is a normally closed two-way solenoid valve.

9. The heat shield according to any of claims 1 to 8, characterized in that the heat shield body (1) comprises a first steel sheet, a ceramic fiber layer and a second steel sheet from the inside to the outside.

10. The heat shield according to any of claims 1 to 8, characterized in that a plurality of nozzles (2) are arranged uniformly in the circumferential direction of the heat shield body (1).