Diesel engine exhaust system heat shield
By designing a split diesel engine exhaust system heat insulation cover, wrapping the front and rear parts of the exhaust manifold, supercharger and oxidation catalyst, forming a cavity and reflecting heat, the problem of poor insulation effect of the existing heat insulation cover is solved, and more efficient thermal isolation and convenient assembly process is achieved.
Patent Information
- Application Number
- CN202421538565.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-07-01
AI Technical Summary
The thermal insulation effect of the existing diesel engine exhaust system heat shield is poor, resulting in a large amount of heat radiation into the engine compartment, affecting the safety of use, and the assembly space is small, resulting in difficulty in assembly.
A split diesel engine exhaust system heat shield is designed, including a first heat shield and a second heat shield. By wrapping the front and rear portions of the exhaust manifold, the supercharger and the oxidation catalyst, a cavity is formed to improve the insulation effect, and to reflect the heat of the exhaust system through the inner surface to enhance the insulation performance.
It significantly improves the thermal insulation effect of the diesel engine exhaust system heat shield, reduces heat radiation into the engine compartment, enhances the reliability and assembly convenience of parts, and avoids supercharger overheating.
Smart Images
Figure CN222558616U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of diesel engine systems, in particular to a heat insulation cover for a diesel engine exhaust system. Background Art
[0002] At present, as the power of diesel engines continues to increase, the exhaust temperature is also getting higher and higher, and the heat is continuously dissipated outward through the exhaust manifold and supercharger. In addition, as the emission standards become increasingly stringent, the distance between the post-processing arrangement and the supercharger is getting closer and closer. When the exhaust gas is oxidized, the post-processing will generate a lot of heat, which will be radiated outward through the post-processing surface. In general, a heat shield is set outside the exhaust system to prevent the high temperature from spreading to the engine compartment, which can reduce the heat radiation to other engine parts and ensure the normal operation of the engine.
[0003] The existing heat insulation cover has a small coverage area for the exhaust system, and the heat insulation cover fits the outer surface of its coverage area, resulting in poor heat insulation effect. A large amount of heat is radiated into the engine compartment through the exhaust system, which will cause damage to other parts, such as failure of sealing rubber parts and oil leakage, which not only affects the use but also poses a safety risk. In addition, since the exhaust system integrates more parts, the space for arranging the heat insulation cover is small, and the existing heat insulation cover ignores the avoidance of the assembly space of surrounding parts, which makes assembly difficult. Utility Model Content
[0004] The technical problem to be solved by the utility model is to improve the heat insulation effect of the heat insulation cover of the exhaust system of a diesel engine.
[0005] The utility model solves the above technical problems through the following technical means: a heat shield for a diesel engine exhaust system, comprising a first heat shield and a second heat shield, the diesel engine exhaust system comprising an exhaust manifold, a supercharger and an oxidation catalyst, the first heat shield is used to wrap the front of the exhaust manifold and can form a cavity between the outer surface of the wrapping range, the second heat shield is used to wrap the rear of the exhaust manifold, the supercharger and the oxidation catalyst and can form a cavity between the outer surface of the wrapping range. The first heat shield and the second heat shield wrap the outside of the exhaust manifold, the supercharger and the oxidation catalyst in the engine exhaust system, increasing the wrapping range; the first heat shield and the second heat shield reflect the heat radiation of the exhaust system through the inner surface to play a heat insulation role, and the cavity can greatly improve the heat insulation effect; by designing the heat shield as a split structure of the first heat shield and the second heat shield, stress concentration is reduced, reliability is increased, and assembly is convenient.
[0006] Preferably, the first heat shield is a metal plate cover body adapted to the shape of the front of the exhaust manifold, and the first heat shield can wrap the front end, the front upper side, the front lower side and the side opposite to the branch pipe of the exhaust manifold, and the first heat shield is provided with a first mounting hole, a second mounting hole and a third mounting hole corresponding to the front upper side, the front lower side and the side opposite to the branch pipe of the exhaust manifold, respectively, and the first heat shield is fixedly connected to the front of the exhaust manifold by fasteners passing through the first mounting hole, the second mounting hole and the third mounting hole.
[0007] Preferably, the second heat shield is a metal plate cover body adapted to the combined shape of the rear of the exhaust manifold, the supercharger and the oxidation catalyst, and the second heat shield can wrap the rear end and the upper side of the rear of the exhaust manifold, and can also wrap the upper side of the supercharger and the oxidation catalyst; the second heat shield is provided with a fourth mounting hole and a fifth mounting hole at positions corresponding to the rear end and the upper side of the rear of the exhaust manifold, respectively, and the second heat shield is fixedly connected to the rear of the exhaust manifold by fasteners passing through the fourth mounting hole and the fifth mounting hole.
[0008] Preferably, a sixth mounting hole is provided on the second heat insulation cover at a position corresponding to the supercharger, and the second heat insulation cover is fixedly connected to the supercharger via a fastener passing through the sixth mounting hole.
[0009] Preferably, a seventh mounting hole close to the branch line and an eighth mounting hole away from the branch line are provided at a position corresponding to the oxidation catalyst on the second heat shield, and the second heat shield is fixedly connected to the oxidation catalyst by fasteners passing through the seventh mounting hole and the eighth mounting hole.
[0010] Preferably, a sunken platform is provided around the seventh mounting hole, and a convex platform is provided around the eighth mounting hole, thereby increasing the strength of the second heat insulation cover.
[0011] Preferably, the second heat shield is provided with parallel reinforcing ribs extending in the front-to-rear direction from the rear end to the position corresponding to the upper side of the oxidation catalyst, and the second heat shield is provided with conformal reinforcing ribs from the top to the position corresponding to the upper side of the rear part of the exhaust manifold, thereby increasing the strength of the second heat shield.
[0012] Preferably, a heat dissipation hole is provided on the heat shield at a position corresponding to the upper side of the connection portion between the supercharger and the oxidation catalyst, which can effectively prevent the supercharger from overheating and reduce the heat exposure of the gasket.
[0013] Preferably, a first avoidance opening is provided on the heat shield at a position corresponding to the rear end of the exhaust manifold, and a second avoidance opening is provided on the heat shield at a position corresponding to the pressure difference sensor, so as to avoid the installation positions of surrounding components and facilitate assembly.
[0014] Preferably, the bending parts of the first heat shield and the second heat shield are both rounded. The rounded corner design reduces stress concentration points, thereby reducing cracking of the heat shield of the diesel engine exhaust system caused by vibration during engine operation.
[0015] The advantages of the utility model are:
[0016] 1. The first heat shield and the second heat shield are wrapped around the outside of the exhaust manifold, the supercharger and the oxidation catalyst in the exhaust system of the engine, thereby increasing the wrapping range; the first heat shield and the second heat shield reflect the heat radiation of the exhaust system through the inner surfaces thereof to achieve heat insulation, and the cavity can greatly improve the heat insulation effect; by designing the heat shield as a split structure of the first heat shield and the second heat shield, stress concentration is reduced, reliability is increased, and assembly is facilitated.
[0017] 2. The heat dissipation holes can effectively prevent the supercharger from overheating and reduce the heat of the gasket.
[0018] 3. The heat shield has good strength, rigidity and assemblability, simple structure and easy production. It effectively blocks heat transfer while ensuring sufficient assembly space for components, and has good noise, vibration and acoustic roughness performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a structural schematic diagram of the diesel engine exhaust system heat shield in the assembled state according to an embodiment of the utility model.
[0020] Figure 2 The figure is a schematic diagram of the exploded structure of the heat shield of the diesel engine exhaust system according to the embodiment of the utility model.
[0021] Figure 3 This is a schematic diagram of the first angle structure of the first heat insulation cover in an embodiment of the utility model.
[0022] Figure 4 This is a schematic diagram of the second angle structure of the first heat shield in an embodiment of the utility model.
[0023] Figure 5 This is a schematic diagram of the first angle structure of the second heat shield in an embodiment of the utility model.
[0024] Figure 6 This is a schematic diagram of the second angle structure of the second heat insulation cover in an embodiment of the utility model. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described in combination with the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.
[0026] like Figure 1 , Figure 2 As shown, an embodiment of the utility model discloses a heat shield for a diesel engine exhaust system, comprising a first heat shield 1 and a second heat shield 2 .
[0027] The diesel engine exhaust system includes an exhaust manifold 3, a supercharger 4 and an oxidation catalyst 5. The first heat shield 1 is used to wrap the front part of the exhaust manifold 3 and can form a cavity between the outer surfaces of the wrapping range. The second heat shield 2 is used to wrap the rear part of the exhaust manifold 3, the supercharger 4 and the oxidation catalyst 5 and can form a cavity between the outer surfaces of the wrapping range.
[0028] like Figure 3 , Figure 4 As shown, the first heat shield 1 is a metal plate cover body adapted to the shape of the front part of the exhaust manifold 3, and the first heat shield 1 can wrap the front end, the front upper side, the front lower side and the side opposite to the branch pipe of the exhaust manifold 3; the first heat shield 1 is provided with a first mounting hole 11, a second mounting hole 12 and a third mounting hole 13 corresponding to the front upper side, the front lower side and the side opposite to the branch pipe of the exhaust manifold 3, respectively, and the first heat shield 1 is fixedly connected to the front part of the exhaust manifold 3 by fasteners passing through the first mounting hole 11, the second mounting hole 12 and the third mounting hole 13.
[0029] like Figure 5 , Figure 6As shown, the second heat shield 2 is a metal plate cover body adapted to the combined shape of the rear part of the exhaust manifold 3, the supercharger 4 and the oxidation catalyst 5. The second heat shield 2 can wrap the rear end and the upper side of the rear part of the exhaust manifold 3, and can also wrap the upper side of the supercharger 4 and the oxidation catalyst 5; the second heat shield 2 is provided with a fourth mounting hole 201 and a fifth mounting hole 202 at positions corresponding to the rear end and the upper side of the rear part of the exhaust manifold 3, respectively, and the second heat shield 2 is fixedly connected to the rear part of the exhaust manifold 3 by fasteners passing through the fourth mounting hole 201 and the fifth mounting hole 202; the second heat shield 2 is provided with a sixth mounting hole 203 at a position corresponding to the supercharger 4, and the second heat shield 2 is fixedly connected to the supercharger 4 by fasteners passing through the sixth mounting hole 203; the second heat shield 2 is provided with a seventh mounting hole 204 close to the branch line side and an eighth mounting hole 205 away from the branch line side at a position corresponding to the oxidation catalyst 5, and the second heat shield 2 is fixedly connected to the supercharger 4 by fasteners passing through the seventh mounting hole 203. 04 and the fasteners of the eighth mounting hole 205 are fixedly connected with the oxidation catalyst 5; a sink 206 is provided around the seventh mounting hole 204, and a boss 207 is provided around the eighth mounting hole 205, which increases the strength of the second heat shield 2; two parallel reinforcing ribs 208 extending in the front-to-back direction are provided on the second heat shield 2 from the rear end to the position corresponding to the upper side of the oxidation catalyst 5, and four conformal reinforcing ribs 209 are provided on the second heat shield 2 from the top to the position corresponding to the upper side of the rear part of the exhaust manifold 3 according to the shape change, which increases the strength of the second heat shield 2; six heat dissipation holes 210 are provided on the heat shield 2 at the position corresponding to the upper side of the connection between the supercharger 4 and the oxidation catalyst 5, which can effectively avoid overheating of the supercharger 4 and reduce the heating of the gasket; a first avoidance port 211 is provided on the heat shield 2 at the position corresponding to the rear end of the exhaust manifold 3, and a second avoidance port 212 is provided on the heat shield 2 at the position corresponding to the pressure difference sensor, which can avoid the installation position of surrounding components and facilitate assembly.
[0030] The first heat shield 1 and the second heat shield 2 are both thin-plate stamping parts, which are completed through processes such as blanking, stamping, flanging, and punching; the first heat shield 1 and the second heat shield 2 are both made of 1.5mm to 2.5mm thick hot-dip aluminum steel plate, which is a composite material, and the manufacturing process is to adhere a layer of aluminum material to the surface of the steel plate through hot rolling; the bending parts of the first heat shield 1 and the second heat shield 2 are both rounded, and the rounded corner design reduces stress concentration points, so as to reduce the cracking phenomenon of the diesel engine exhaust system heat shield caused by vibration during engine operation.
[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A heat shield for a diesel engine exhaust system, characterized in that: The invention comprises a first heat shield and a second heat shield. The diesel engine exhaust system comprises an exhaust manifold, a supercharger and an oxidation catalyst. The first heat shield is used to wrap the front part of the exhaust manifold and can form a cavity between the outer surface of the wrapping range thereof. The second heat shield is used to wrap the rear part of the exhaust manifold, the supercharger and the oxidation catalyst and can form a cavity between the outer surface of the wrapping range thereof.
2. The diesel engine exhaust system heat shield according to claim 1, characterized in that: The first heat shield is a metal plate cover adapted to the shape of the front of the exhaust manifold. The first heat shield can wrap the front end, the front upper side, the front lower side and the side opposite to the branch pipe of the exhaust manifold. The first heat shield is provided with a first mounting hole, a second mounting hole and a third mounting hole corresponding to the front upper side, the front lower side and the side opposite to the branch pipe of the exhaust manifold, respectively. The first heat shield is fixedly connected to the front of the exhaust manifold by fasteners passing through the first mounting hole, the second mounting hole and the third mounting hole.
3. The diesel engine exhaust system heat shield according to claim 1, characterized in that: The second heat shield is a metal plate cover adapted to the combined shape of the rear of the exhaust manifold, the supercharger and the oxidation catalyst. The second heat shield can wrap the rear end and the upper side of the rear of the exhaust manifold, and can also wrap the upper side of the supercharger and the oxidation catalyst. The second heat shield is provided with a fourth mounting hole and a fifth mounting hole at positions corresponding to the rear end and the upper side of the rear of the exhaust manifold, respectively. The second heat shield is fixedly connected to the rear of the exhaust manifold by fasteners passing through the fourth mounting hole and the fifth mounting hole.
4. The diesel engine exhaust system heat shield as claimed in claim 3, characterized in that: A sixth mounting hole is provided on the second heat insulation cover at a position corresponding to the supercharger, and the second heat insulation cover is fixedly connected to the supercharger via a fastener passing through the sixth mounting hole.
5. The diesel engine exhaust system heat shield as claimed in claim 3, characterized in that: A seventh mounting hole close to the branch line and an eighth mounting hole away from the branch line are provided on the second heat shield at a position corresponding to the oxidation catalyst, and the second heat shield is fixedly connected to the oxidation catalyst via fasteners passing through the seventh mounting hole and the eighth mounting hole.
6. The diesel engine exhaust system heat shield as claimed in claim 5, characterized in that: A sunken platform is provided around the seventh mounting hole, and a convex platform is provided around the eighth mounting hole.
7. The diesel engine exhaust system heat shield as claimed in claim 3, characterized in that: The second heat shield is provided with parallel reinforcing ribs extending in the front-to-rear direction from the rear end to the upper side of the corresponding oxidation catalyst, and the second heat shield is provided with conformal reinforcing ribs from the top to the upper side of the rear portion of the corresponding exhaust manifold.
8. The diesel engine exhaust system heat shield as claimed in claim 3, characterized in that: The heat shield is provided with heat dissipation holes at positions corresponding to the upper side of the connection portion between the supercharger and the oxidation catalyst.
9. The diesel engine exhaust system heat shield as claimed in claim 3, characterized in that: A first avoidance opening is provided on the heat shield at a position corresponding to the rear end of the exhaust manifold, and a second avoidance opening is provided on the heat shield at a position corresponding to the pressure difference sensor.
10. The diesel engine exhaust system heat shield as claimed in claim 1, characterized in that: The bending parts of the first heat insulation cover and the second heat insulation cover are both rounded.