Heat shield, engine and transportation tool
By designing a heat shield including branch pipe heat insulation cover, inner heat insulation plate and cylinder head heat insulation plate, the problems of poor sealing and leakage of insulation materials in the existing exhaust pipe heat insulation technology are solved, and efficient and safe heat insulation effect is achieved.
Patent Information
- Application Number
- CN202311608860.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-28
- Publication Date
- 2025-05-30
AI Technical Summary
The existing exhaust pipe insulation technology has problems such as poor sealing, leakage of insulation materials, unsafe to the environment and operators, as well as weak rigidity of the insulation cover, high vibration noise, and poor thermal insulation effect.
A heat insulation cover is designed, including a branch pipe heat insulation cover, an inner heat insulation plate and a cylinder head heat insulation plate, forming a sealed insulation unit that covers the circumferential space of the exhaust pipe, ensuring thermal insulation effect, and is convenient for disassembly through a modular design.
Complete sealing and heat insulation of the exhaust pipe is achieved, reducing heat transfer, improving heat insulation effect, enhancing the rigidity and durability of the heat shield, and reducing environmental pollution and the health risks of operators.
Smart Images
Figure CN120061967A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of engines, and more particularly to a heat shield, an engine, and a means of transportation. Background Art
[0002] The exhaust pipe is a passage for discharging the exhaust gas after the combustion of the engine, and the temperature of the exhaust gas is as high as about 700 °C. Due to the heat transfer of the high-temperature exhaust gas, the temperature of the exhaust pipe wall is relatively high, causing a large amount of heat transfer to the components around the engine exhaust pipe, affecting the reliability of the components. At the same time, there is also a certain potential safety hazard to the safety of the engine operator. Therefore, it is necessary to insulate the exhaust pipe, and the temperature after insulation is controlled below 200 °C.
[0003] Currently, the heat insulation of the exhaust pipe usually adopts the method of a soft-pack heat insulation sleeve. The soft-pack heat insulation sleeve is usually made of inorganic fiber material and is wrapped around the outer wall of the exhaust pipe to achieve the heat insulation effect. However, this kind of soft-pack heat insulation sleeve has high requirements for wrapping and installation, and it is easy to have the situation of incomplete wrapping, thus affecting the heat insulation effect. At the same time, the heat insulation material of the soft-pack heat insulation sleeve will leak out, and the dust is extremely easy to fly and pollute the environment, and it is easy to stimulate the skin of the operator to cause discomfort. Inhaled into the human body and deposited in the lungs can cause lung cancer. In addition, the soft-pack heat insulation sleeve is not wear-resistant and not fold-resistant, has poor waterproof performance, and allows fewer repeated disassembly times, and needs to be replaced frequently.
[0004] In addition, some engines adopt the method of arranging a single-layer heat shield shell outside the soft-pack heat insulation sleeve. However, this method still has the above problems. At the same time, the single-layer heat shield shell has the disadvantages of weak rigidity and large vibration noise; the heat shield is not closed, there are gaps between the cylinder heads, and it is easy to exceed the standard during temperature monitoring; there is no separate heat insulation measure on the inner side, and the exhaust pipe heats the air cooler, affecting the efficiency of the air cooler.
[0005] Therefore, there is a need for a heat shield, an engine, and a means of transportation to at least partially solve the above problems. Summary of the Invention
[0006] A series of simplified concepts are introduced in the content part of the present application, which will be further detailed in the specific implementation part. The content part of the present application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.
[0007] To at least partially solve the above problems, a first aspect of the present application provides a heat shield for completely sealing and insulating the exhaust pipe of an engine, including a heat insulation unit, the heat insulation unit is sealed along the circumferential direction of the heat shield, and the heat insulation unit includes:
[0008] A branch pipe heat shield extending along the circumferential direction;
[0009] An inner heat shield, which is connected to the branch pipe heat shield;
[0010] A cylinder head heat shield, which is arranged at the bottom of the heat shield and connected to the branch pipe heat shield and the inner heat shield, and the cylinder head heat shield is used to seal the gap between adjacent cylinder heads of the engine.
[0011] According to the present application, the heat shield can cover the circumferential space of the exhaust pipe, so that there are heat shields between the exhaust pipe and the air cooler, between adjacent cylinder heads, and between the exhaust pipe and the cylinder head cover, without hot spot leakage and with good heat insulation effect; the heat insulation unit is rigid and modular, facilitating disassembly.
[0012] Preferably, the heat shield includes at least two heat insulation units, and the at least two heat insulation units are arranged along the axial direction of the heat shield.
[0013] Preferably, the heat shield further includes a first end heat shield, which is arranged at the first end of the heat shield and extends along the radial direction of the heat shield, and the first end heat shield is used to seal the end of the exhaust pipe near the free end of the engine.
[0014] Preferably, the heat shield further includes a second end heat shield, which is arranged at the second end of the heat shield and extends and seals along the circumferential direction, and the second end heat shield is used to cooperate with the supercharger heat shield of the engine.
[0015] Preferably, the circumferential dimension of the second end heat shield is larger than the circumferential dimension of the heat insulation unit.
[0016] Preferably, the heat shield further includes a first bracket, which is connected to the second end heat shield.
[0017] Preferably, the heat shield further includes an intermediate heat shield, which is arranged between adjacent heat insulation units, and the intermediate heat shield is respectively connected to adjacent branch pipe heat shields.
[0018] Preferably, the two sides of the intermediate heat shield are respectively spaced apart from the intermediate heat shield body along the axial direction of the heat shield, and form a notch with an opening facing the inside of the heat shield, and the two sides of the branch pipe heat shield along the axial direction have grooves with openings facing the outside of the heat shield, and at least part of the sides of the intermediate heat shield are located in the grooves.
[0019] Preferably, the inner heat shield is provided with a second bracket, and the second bracket is used to connect to the air cooler of the engine.
[0020] Preferably, the inner heat insulation plate is provided with a third bracket for connecting to the intake box of the engine.
[0021] Preferably, the branch pipe heat insulation cover includes an avoidance heat insulation plate having a recess facing the inside of the heat insulation cover, and the avoidance heat insulation plate is used to separate the exhaust pipe and the cylinder head cover of the engine.
[0022] Preferably, the heat insulation plate of the heat insulation cover includes a first layer, a second layer and a heat insulation layer. The first layer is connected to the second layer to form a cavity, and the heat insulation layer is arranged in the cavity.
[0023] A second aspect of the present application provides an engine, which includes the heat insulation cover according to any one of the above technical solutions.
[0024] According to the present application, with the heat insulation cover of the above first aspect, it thus has technical effects similar to those of the heat insulation cover of the above first aspect.
[0025] A third aspect of the present application provides a transportation vehicle, which includes the engine according to the above technical solution.
[0026] According to the present application, with the engine of the above second aspect, it thus has technical effects similar to those of the engine of the above second aspect. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The following drawings of the present application are hereby taken as a part of the present application for understanding the present application. The embodiments and descriptions thereof shown in the drawings are used to explain the principles of the present application.
[0028] In the drawings:
[0029] Figure 1 is a three-dimensional schematic diagram of the heat insulation cover according to the preferred embodiment of the present application;
[0030] Figure 2 is Figure 1 the cross-sectional schematic diagram of the heat insulation cover in
[0031] Figure 3 is an engine partial three-dimensional schematic diagram including the heat insulation cover shown in Figure 1 ;
[0032] Figure 4 is Figure 1 the three-dimensional schematic diagram of the avoidance heat insulation plate of the heat insulation cover in
[0033] Figure 5 is Figure 4 the cross-sectional schematic diagram of the avoidance heat insulation plate in
[0034] Figure 6For Figure 1 Partial sectional view schematic diagram of the heat shield in
[0035] Explanation of reference numerals:
[0036] 10: Engine
[0037] 11: Exhaust pipe
[0038] 12: Air cooler
[0039] 13: Cylinder head
[0040] 14: Intake box
[0041] 15: Cylinder head cover
[0042] 100: Heat shield
[0043] 110: Heat insulation unit
[0044] 111: Branch pipe heat shield
[0045] 112: Avoidance heat insulation plate
[0046] 113: Inner heat insulation plate
[0047] 114: Cylinder head heat insulation plate
[0048] 115: Branch pipe heat shield main body
[0049] 116: Mounting plate
[0050] 117: Outer plate
[0051] 118: Inner plate
[0052] 119: Avoidance heat insulation layer
[0053] 120: First end heat insulation plate
[0054] 130: Second end heat shield
[0055] 140: First bracket
[0056] 150: Intermediate heat shield
[0057] 151: Intermediate heat shield main body
[0058] 160: Second bracket
[0059] 170: Third bracket
[0060] 181: Boss
[0061] 182: Groove Detailed implementation mode
[0062] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application may be practiced without one or more of these specific details. In other instances, well-known features of the art are not described in order to avoid obscuring the present application.
[0063] For a thorough understanding of the present application, a detailed description will be presented in the following. Obviously, the implementation of the embodiments of the present application is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present application are described in detail below. However, in addition to these detailed descriptions, the present application may also have other embodiments.
[0064] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or combinations thereof.
[0065] The ordinal numbers such as "first" and "second" cited in the present application are merely identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component".
[0066] It should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer" and similar expressions used herein are only for illustrative purposes and are not restrictive.
[0067] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited only to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present application is thorough and complete, and the concept of these exemplary embodiments is fully conveyed to those of ordinary skill in the art.
[0068] As Figure 1-3 shown, a first aspect of the present application discloses a heat shield 100 for heat insulation of an exhaust pipe 11 of an engine 10. The heat shield 100 is made of a rigid material. The heat shield 100 includes a heat insulation unit 110, as Figure 2As shown, the heat insulation unit 110 is sealed along the circumferential direction of the heat insulation cover 100. The heat insulation unit 110 can determine its outer dimensions according to the outer dimensions of the exhaust pipe 11 for sealing the exhaust pipe 11 along the circumferential direction. In this embodiment, the heat insulation unit 110 is configured to be generally cylindrical. The heat insulation unit 110 includes a branch pipe heat insulation cover 111, an inner heat insulation plate 113, and a cylinder head heat insulation plate 114. The branch pipe heat insulation cover 111 extends along the circumferential direction. The inner heat insulation plate 113 is connected to the branch pipe heat insulation cover 111. When the heat insulation cover 100 is installed on the engine, the inner heat insulation plate 113 is closer to the air cooler 12 of the engine 10 than the branch pipe heat insulation cover 111 for separating the exhaust pipe 11 and the air cooler 12, preventing the exhaust pipe 11 from heating the air cooler 12 and thus affecting the efficiency of the air cooler 12. The cylinder head heat insulation plate 114 is disposed at the bottom of the heat insulation cover 100 and is connected to the branch pipe heat insulation cover 111 and the inner heat insulation plate 113. The cylinder head heat insulation plate 114 is used to seal the gap between adjacent cylinder heads 13 of the engine 10, that is, the cylinder head heat insulation plate 114 is used to be disposed between adjacent cylinder heads 13 to prevent hot spot leakage caused by the gap between adjacent cylinder heads 13.
[0069] According to the present application, the heat insulation cover 100 can cover the circumferential space of the exhaust pipe 11, so that there are heat insulation plates between the exhaust pipe 11 and the air cooler 12, between adjacent cylinder heads 13, and between the exhaust pipe 11 and the cylinder head cover 15, without hot spot leakage and with good heat insulation effect; the heat insulation unit 110 has strong rigidity and is modular, facilitating disassembly.
[0070] The branch pipe heat insulation cover 111 may further include a branch pipe heat insulation cover body 115 and an avoidance heat insulation plate 112. The branch pipe heat insulation cover body 115 has an avoidance opening at a position corresponding to the cylinder head cover 15. The avoidance heat insulation plate 112 is connected to the branch pipe heat insulation cover body 115 (for example, through a fixing member) and seals and covers the avoidance opening of the branch pipe heat insulation cover body 115. The avoidance heat insulation plate 112 may be disposed opposite to the inner heat insulation plate 113. The avoidance heat insulation plate 112 is used to separate the exhaust pipe 11 and the cylinder head cover 15 of the engine 10, preventing the heat of the exhaust pipe 11 from being transferred to the cylinder head cover 15 and thus affecting its reliability. To avoid interference with the cylinder head cover 15, the avoidance heat insulation plate 112 has a depression facing the inside of the heat insulation cover, that is, the depression may face the inner heat insulation plate 113 to avoid the cylinder head cover 15. In this embodiment, each branch pipe heat insulation cover 111 has two avoidance heat insulation plates 112.
[0071] Specifically, the edge of the avoidance heat insulation plate 112 may form a notch with an opening facing the inside of the heat insulation cover 100. Correspondingly, the edge of the avoidance opening of the branch pipe heat insulation cover body 115 is formed with a notch with an opening facing the outside of the heat insulation cover. Thus, the avoidance heat insulation plate 112 and the branch pipe heat insulation cover body 115 are mutually embedded to form a labyrinth channel, reducing heat flow leakage.
[0072] Each heat insulation unit 110 may correspond to a single cylinder or multiple cylinders. In this embodiment, the heat insulation cover 100 includes at least two heat insulation units 110, and the at least two heat insulation units 110 are arranged along the axial direction of the heat insulation cover 100, and each heat insulation unit 110 corresponds to two cylinders. Thus, it is convenient for the serialization of the heat insulation units 110, with good versatility, and can be mass-produced by an assembly line, reducing costs.
[0073] A second bracket 160 is provided on the inner heat insulation plate 113 of the heat insulation unit 110 corresponding to the air cooler 12 among the at least two heat insulation units 110. The second bracket 160 is used to connect to the air cooler 12 to fix the inner heat insulation plate 113 to the engine 10. The second bracket 160 may be configured as a long strip extending along the axial direction. One side of the second bracket 160 is fixedly connected to the inner heat insulation plate 113 through a fixing member (e.g., a bolt), and the opposite side is fixedly connected to the air cooler 12 through a fixing member.
[0074] A third bracket 170 is provided on the inner heat insulation plate 113 of the heat insulation unit 110 that does not correspond to the air cooler 12 among the at least two heat insulation units 110. The third bracket 170 is used to connect to the intake air box 14 of the engine 10 to fix the inner heat insulation plate 113 to the engine 10. The third bracket 170 may be configured as an L shape. One side extending in the vertical direction is fixedly connected to the inner heat insulation plate 113 through a fixing member (e.g., a bolt), and the side extending in the horizontal direction is fixedly connected to the intake air box 14 through a fixing member. Among them, the side of the third bracket 170 extending in the vertical direction may be configured as a rectangle with at least one hollow opening. Thus, it can not only increase the fixing points but also reduce the weight of the third bracket 170.
[0075] In this embodiment, the inner heat insulation plate 113 is configured as a rectangle to facilitate the installation of the brackets.
[0076] Specifically, the installation method of the heat insulation unit 110 is to fix the inner heat insulation plate 113 to the air cooler 12 through the second bracket 160 or to the intake air box 14 through the third bracket 170, fix the cylinder head heat insulation plate 114 to the cylinder head 13 of the engine 10 and connect it to the inner heat insulation plate 113, and finally connect the branch pipe heat insulation cover 111 to the inner heat insulation plate 113 and the cylinder head heat insulation plate 114.
[0077] The heat insulation cover 100 further includes an intermediate heat insulation cover 150. The intermediate heat insulation cover 150 is disposed between adjacent heat insulation units 110. Specifically, the intermediate heat insulation cover 150 is respectively connected to adjacent branch pipe heat insulation covers 111 to cover the connection portion of the adjacent branch pipe heat insulation covers 111, thereby preventing hot spot leakage caused by the gaps between the heat insulation units 110.
[0078] Further, as Figure 6As shown, the two sides of the intermediate heat shield 150 are spaced apart from the intermediate heat shield main body 151 along the axial direction of the heat shield 100 respectively, and form notches with the openings facing the inside of the heat shield 100. The two sides of the branch pipe heat shield 111 in the axial direction have grooves 182 with the openings facing the outside of the heat shield 100. At least part of the sides of the intermediate heat shield 150 is located in the grooves 182. On both sides of the grooves 182 of the branch pipe heat shield 111, there are formed bosses 181, and at least part of the bosses 181 is located in the notches of the intermediate heat shield 150, and then the intermediate heat shield 150 and the branch pipe heat shield 111 are connected together by fasteners. Thus, the intermediate heat shield 150 and the branch pipe heat shield 111 are mutually embedded to form a labyrinth structure, making the connection between the intermediate heat shield 150 and the branch pipe heat shield 111 tighter and reducing heat flow leakage.
[0079] As Figure 1 and Figure 3 shown, the heat shield 100 further includes a first end heat shield 120 and a second end heat shield 130. The first end heat shield 120 is disposed at the first end of the heat shield 100 and extends in the radial direction of the heat shield 100. The first end heat shield 120 is connected to the heat insulation unit 110 at the free end closest to the engine 10 for sealing the end of the exhaust pipe 11 at the free end close to the engine 10. The first end heat shield 120 and the heat insulation unit 110 form a closed space that completely wraps the end of the exhaust pipe 11 to prevent hot spot leakage.
[0080] The second end heat shield 130 is disposed at the second end of the heat shield 100 and extends and seals in the circumferential direction for circumferentially surrounding and sealing the exhaust pipe 11, where the second end is opposite to the first end. The second end heat shield 130 is connected to the heat insulation unit 110 at the output end closest to the engine 10 for cooperating with the supercharger heat shield (not shown) of the engine 10. Further, the circumferential dimension of the second end heat shield 130 is larger than the circumferential dimension of the heat insulation unit 110 to more reliably cooperate with the supercharger heat shield.
[0081] The heat shield 100 may further include a first bracket 140. The first bracket 140 is connected to the second end heat shield 130 to fix the second end heat shield 130. In this embodiment, the first bracket 140 is connected to the bottom of the second end heat shield 130 and connected to the supercharger bracket (not shown) to connect the second end heat shield 130 to the supercharger bracket.
[0082] In this embodiment, the heat shield of the heat insulation cover 100 is composed of three layers, including a first layer, a second layer, and a heat insulation layer. Among them, the first layer is connected to the second layer to form a cavity, and the heat insulation layer is arranged in the cavity. For example, the first layer and the second layer can be metal sheet metal plates, which are connected by forms such as welding or riveting to form an intermediate cavity, and the heat insulation material is filled into the cavity as the heat insulation layer to form the heat shield.
[0083] As Figure 4 and Figure 5 shown, taking the avoidance heat shield 112 as an example, the avoidance heat shield 112 includes a mounting plate 116, an outer plate 117, an inner plate 118, and an avoidance heat insulation layer 119 between the outer plate 117 and the inner plate 118. The mounting plate 116 and the outer plate 117 are close to the outside of the heat insulation cover 100. The mounting plate 116 is connected to the branch pipe heat shield main body 115 to mount the avoidance heat shield 112 to the branch pipe heat shield main body 115. The outer plate 117 can be configured in a trapezoidal stamping shape to match the cylinder head cover 15, so that there is a gap between the cylinder head cover 15 and the avoidance heat shield 112 to avoid interference. The avoidance heat insulation layer 119 formed of the heat insulation material ensures the heat insulation effect of the heat insulation cover 100 at the cylinder head cover 15.
[0084] As Figure 3 shown, a second aspect of the present application discloses an engine 10. The engine 10 includes the above-mentioned heat insulation cover 100.
[0085] In this embodiment, two heat insulation covers 100 are respectively arranged on both sides of the air cooler 12 to insulate the exhaust pipes 11 on both sides of the air cooler 12.
[0086] According to the present application, having the heat insulation cover 100 of the above first aspect, it thus has technical effects similar to those of the heat insulation cover 100 of the above first aspect.
[0087] A third aspect of the present application discloses a transportation vehicle. The transportation vehicle includes the above-mentioned engine 10. The transportation vehicle can be a ship or a vehicle.
[0088] According to the present application, having the engine 10 of the above second aspect, it thus has technical effects similar to those of the engine 10 of the above second aspect.
[0089] Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the technical field of the present application. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The features described in one embodiment herein can be applied alone or in combination with other features to another embodiment, unless the feature is not applicable or otherwise stated in that other embodiment.
[0090] The present application has been described through the above embodiments. However, it should be understood that the above embodiments are only for illustrative and explanatory purposes. The present application is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present application, and these variations and modifications all fall within the scope claimed by the present application.
Claims
1. A heat shield for completely sealing and heat insulating the exhaust pipe of an engine, characterized in that, it includes a heat insulation unit, the heat insulation unit is sealed along the circumferential direction of the heat shield, and the heat insulation unit includes: a branch pipe heat shield, the branch pipe heat shield extends along the circumferential direction; an inner heat insulation plate, the inner heat insulation plate is connected to the branch pipe heat shield; a cylinder head heat insulation plate, the cylinder head heat insulation plate is arranged at the bottom of the heat shield and is connected to the branch pipe heat shield and the inner heat insulation plate, and the cylinder head heat insulation plate is used to seal the gap between adjacent cylinder heads of the engine.
2. The heat shield according to claim 1, characterized in that, the heat shield includes at least two of the heat insulation units, and at least two of the heat insulation units are arranged along the axial direction of the heat shield.
3. The heat shield according to claim 2, characterized in that, the heat shield further includes a first end heat insulation plate, the first end heat insulation plate is arranged at the first end of the heat shield and extends along the radial direction of the heat shield, and the first end heat insulation plate is used to seal the end of the exhaust pipe near the free end of the engine.
4. The heat shield according to claim 2, characterized in that, the heat shield further includes a second end heat shield, the second end heat shield is arranged at the second end of the heat shield and extends and seals along the circumferential direction, and the second end heat shield is used to cooperate with the supercharger heat shield of the engine.
5. The heat shield according to claim 4, characterized in that, the circumferential dimension of the second end heat shield is larger than the circumferential dimension of the heat insulation unit.
6. The heat shield according to claim 4, characterized in that, the heat shield further includes a first bracket, and the first bracket is connected to the second end heat shield.
7. The heat shield according to claim 2, characterized in that, the heat shield further includes an intermediate heat shield, the intermediate heat shield is arranged between adjacent heat insulation units, and the intermediate heat shield is respectively connected to adjacent branch pipe heat shields.
8. The heat shield according to claim 7, characterized in that, both sides of the intermediate heat shield are respectively spaced apart from the main body of the intermediate heat shield along the axial direction of the heat shield, and form a notch with an opening facing the inside of the heat shield, and both sides of the branch pipe heat shield along the axial direction have grooves with openings facing the outside of the heat shield, and at least part of the side of the intermediate heat shield is located in the grooves.
9. The heat shield according to claim 2, characterized in that, the inner heat insulation plate is provided with a second bracket, and the second bracket is used to connect to the air cooler of the engine.
10. The heat shield according to claim 2, characterized in that, the inner heat insulation plate is provided with a third bracket, and the third bracket is used to connect to the intake box of the engine.
11. The heat shield according to claim 1, characterized in that, the branch pipe heat shield includes an avoidance heat insulation plate, the avoidance heat insulation plate has a depression facing the inside of the heat shield, and the avoidance heat insulation plate is used to separate the exhaust pipe and the cylinder head cover of the engine.
12. The heat shield according to any one of claims 1-11, characterized in that, the heat insulation board of the heat shield comprises a first layer, a second layer and a heat insulation layer, the first layer is connected to the second layer to form a cavity, and the heat insulation layer is arranged in the cavity.
13. An engine, characterized in that, the engine comprises the heat shield according to any one of claims 1-12.
14. A means of transportation, characterized in that, the means of transportation comprises the engine according to claim 13.