A pipe assembly

Abstract

The utility model discloses a kind of pipeline assemblies, for installation in engine body, pipeline assembly includes first cooling pipe, first support and metal layer, first cooling pipe is communicated with the inside of engine body, and it is connected with the outside wall of engine body by first support, wherein, the section of first cooling pipe is rectangle, the height of section is h1, width is h2, and h1 The utility model provides pipeline assembly, by making the section of cooling pipe rectangle, and the height size of section is less than the width size of section, to meet the flow demand of cooling pipe while, compress the space occupied in height direction by cooling pipe.In addition, by making cooling pipe and support metal material again, and the outside wall of at least part of cooling pipe is covered metal layer, and cooling pipe is connected with the outside wall of engine body by metal layer and support, to meet the arrangement demand of cooling pipe in existing height space, reduce the leakage risk of cooling pipe.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to a pipeline assembly. Background Technology

[0002] The engine cooling system, as one of the five major systems of an engine, is crucial in engine design. Specifically, the engine cooling system requires numerous pipes to transport coolant, and currently, most of these pipes are made of shaped steel tubing, rubber hoses, cast aluminum tubing, or plastic tubing. Since the coolant delivery pipes are typically located on the exhaust side, their materials must meet certain temperature resistance requirements.

[0003] As engines are continuously updated, the design of the various pipes connecting to them becomes increasingly complex, and there is a risk of leakage during assembly. Considering the limited height space at the bottom of the cockpit, it is becoming increasingly difficult to meet the layout requirements of the new cooling pipes without modifying other parts.

[0004] Therefore, how to meet the layout requirements of cooling pipes within the existing height space, and reduce the risk of pipe leakage, has become a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] This invention provides a piping assembly that is installed on the outside of the engine body to meet the requirements for the arrangement of cooling pipes within the existing height space, and to reduce the risk of pipe leakage.

[0006] This utility model provides a pipeline assembly installed on the outside of an engine body. The pipeline assembly includes a first cooling pipe, a first bracket, and a metal layer. The first cooling pipe communicates with the interior of the engine body and is connected to the outer wall of the engine body through the first bracket. The first cooling pipe has a rectangular cross-section with a height of h1 and a width of h2, where h1 < h2. Along the circumference of the first cooling pipe, the metal layer covers at least a portion of the first cooling pipe, and the first bracket is connected to the metal layer. The first cooling pipe and the first bracket are made of metal.

[0007] The piping assembly provided by this invention effectively compresses the space occupied by the cooling pipe in the vertical direction while meeting the flow requirements of the cooling pipe by making its cross-section rectangular, with the height dimension of the cross-section smaller than its width dimension. Furthermore, by making the cooling pipe and the first bracket metal, and at least a portion of the outer wall of the cooling pipe covered with a metal layer, and connecting the cooling pipe to the outer wall of the engine body through the metal layer and the bracket, the temperature resistance requirements of the cooling pipe and its related components, the layout requirements of the cooling piping, and the risk of cooling pipe leakage are met within the existing height space.

[0008] In one possible implementation of this utility model, the first cooling pipe includes a first bent pipe and a second bent pipe that are connected to each other, and the first bent pipe is in communication with the interior of the engine body; the piping assembly also includes a second cooling pipe and a second bracket, the second cooling pipe includes a third bent pipe and a fourth bent pipe that are connected to each other, and the third bent pipe is in communication with the interior of the engine body; along the width direction of the cross section, the first bent pipe is closer to the engine body than the fourth bent pipe; along the height direction of the cross section, the second bent pipe and the third bent pipe are arranged in sequence; the third bent pipe is connected to the outer wall of the engine body through the second bracket.

[0009] In one possible implementation of this utility model, the cross-section of the second cooling pipe is rectangular, the height of the cross-section of the second cooling pipe is h3, the width is h4, and h3 < h4; the height direction of the cross-section of the second cooling pipe is the same as the height direction of the cross-section of the first cooling pipe.

[0010] In one possible implementation of this utility model, the pipeline assembly further includes a first clamp, through which the first bend and the fourth bend pass, and the portions of the adjacent sidewalls of the first bend and the fourth bend surrounded by the first clamp abut against each other; the first clamp is used to clamp the first bend and the fourth bend.

[0011] In one possible implementation of this utility model, a first protrusion is provided on the side wall of the first bent tube facing the fourth bent tube; a second protrusion is provided on the side wall of the fourth bent tube facing the first bent tube, and the first protrusion and the second protrusion abut against each other.

[0012] In one possible implementation of this utility model, the engine further includes an exhaust pipe, and along the height direction of the cross section, the second bend pipe is closer to the exhaust pipe than the third bend pipe.

[0013] In one possible implementation of this utility model, the pipeline assembly further includes a second clamp for clamping the third bent pipe; the second bracket includes a first bent portion and a second bent portion connected together, the first bent portion being connected to the outer wall of the engine body, and at least a portion of the second bent portion being disposed between the second bent pipe and the third bent pipe and connected to the second clamp.

[0014] In one possible implementation of this invention, the piping assembly further includes a flexible pad, at least a portion of which is located between the second clamp and the third bend.

[0015] In one possible implementation of this utility model, the sidewall of the second cooling pipe further includes at least two limiting protrusions. Along the extension direction of the second cooling pipe, there is a gap between two adjacent limiting protrusions. The second clamp is located in the gap and abuts against the two adjacent limiting protrusions.

[0016] In one possible implementation of this utility model, the pipeline assembly further includes a degassing pipe, which is disposed on the side wall of the first cooling pipe and communicates with the first cooling pipe. Attached Figure Description

[0017] Figure 1 A schematic diagram of the engine body and piping assembly provided by this utility model; Figure 2 for Figure 1 Cross-sectional view of the provided piping assembly; Figure 3 for Figure 1 Top view of the provided piping assembly; Figure 4 for Figure 3 Sectional view along AA; Figure 5 This is a schematic diagram of one possible structure of the second support; Figure 6 for Figure 3 A schematic diagram of a structure along the Y-axis; Figure 7 for Figure 3 A magnified view of a section at point B.

[0018] Reference numerals: 1-First cooling pipe; 11-First bent pipe; 111-First protrusion; 12-Second bent pipe; 2-First bracket; 3-Metal layer; 4-Engine body; 5-Second cooling pipe; 51-Third bent pipe; 52-Fourth bent pipe; 521-Second protrusion; 53-Limiting protrusion; 6-Second bracket; 61-First bent portion; 62-Second bent portion; 63-Hollowed portion; 7-First clamp; 8-Second clamp; 9-Flexible pad; 010-Degassing pipe. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted. The terms expressing position and direction described in the embodiments of this utility model are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the protection scope of this utility model. The accompanying drawings of the embodiments of this utility model are only for illustrating relative positional relationships and do not represent actual proportions.

[0020] It should be noted that specific details are set forth in the following description to facilitate understanding of this utility model. However, this utility model can be implemented in many ways other than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0021] The engine cooling system, as one of the five major systems of an engine, is crucial in engine design. Specifically, the engine cooling system requires numerous pipes to transport coolant, and currently, most of these pipes are made of shaped steel tubing, rubber hoses, cast aluminum tubing, or plastic tubing. Since the coolant delivery pipes are typically located on the exhaust side, their materials must meet certain temperature resistance requirements.

[0022] As engines are continuously updated, the design of the various pipes connecting them internally becomes increasingly complex. Considering the limited height space at the bottom of the cockpit, it is becoming increasingly difficult to meet the new cooling pipe layout requirements without modifying other parts.

[0023] In view of this, the piping assembly provided by this utility model, by making the cross-section of the cooling pipe rectangular, and the height dimension of the cross-section smaller than the width dimension, can effectively reduce the space occupied by the cooling pipe in the vertical direction while meeting the flow requirements of the cooling pipe. Furthermore, by connecting the cooling pipe to the engine body through a bracket and a metal layer, the need for a stable connection between the engine body and the cooling pipe is met, while also fulfilling the arrangement requirements of the cooling pipe and its connecting parts, and reducing the risk of pipe leakage. To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] It should be noted that the engine is usually installed under the cab near the front of the vehicle. Depending on the overall design requirements of the vehicle, there are specific requirements for the height (from the chassis of the vehicle to the cab) of the space used to install the engine.

[0025] refer to Figure 1 , Figure 1 A structural schematic diagram illustrating an engine and piping assembly. The piping assembly includes a first cooling pipe 1, a first bracket 2, and a metal layer 3. The engine includes an engine body 4, wherein the first cooling pipe 1 communicates internally with the engine body 4 for coolant transfer. The first cooling pipe 1 is connected to the outer wall of the engine body 4 via the first bracket 2. For details, refer to... Figure 2 , Figure 2 For display Figure 1 A cross-sectional view of the provided piping assembly. The first cooling pipe 1 has a rectangular cross-section, and the height of the cross-section (along as shown)... Figure 1 or Figure 2 The Z-axis direction shown is h1, and the width (along the Z-axis direction) is h1. Figure 1 or Figure 2 (As shown in the Y-axis direction) is h2, and h1 < h2. For example, 31mm ≤ h1 ≤ 41mm, 47mm ≤ h2 ≤ 57mm. Understandably, since the coolant flowing through the cooling pipe needs to meet certain flow requirements for heat dissipation, the cross-section of the cooling pipe is set to rectangular, with increased width and reduced height to meet the flow requirements. Furthermore, when the cooling pipe is installed on the outside of the engine body 4, the height of the cooling pipe cross-section can be aligned with the height of the space used for engine installation (along the Y-axis direction). Figure 1 or Figure 2 (The direction shown is consistent with the Z-axis) to reduce the height space occupied by the cooling pipes.

[0026] Since both the cooling pipe and the first bracket 2 are made of metal, when specifically setting the metal layer 3, along the circumference of the first cooling pipe 1, the metal layer 3 can cover at least a portion of the first cooling pipe 1. Specifically, the metal layer 3 can cover only the portion near the bracket, and the thickness of the metal layer 3 can be adjusted according to actual welding requirements. For example, a reliable connection between the metal layer 3 and the first cooling pipe 1 can be achieved through an internal high-pressure process. Furthermore, the first bracket 2 is connected to the metal layer 3, for example, by welding. This connection can ensure a reliable connection between the cooling pipe and the engine body 4 while effectively reducing the risk of cooling pipe leakage caused by direct welding between the bracket and the cooling pipe.

[0027] Understandably, by reducing the height of the cooling pipe's cross-section, on the one hand, it can improve the cooling pipe's adaptability to the installation space of different engines. On the other hand, it also helps to increase the distance between the cooling pipe and the engine's exhaust pipe, in order to further improve the cooling pipe's temperature resistance and extend the engine's service life.

[0028] In addition, since the cooling pipe, the bracket used to connect the cooling pipe to the engine body 4, and the metal layer 3 are all made of metal, they are conducive to meeting the temperature resistance requirements of the cooling pipe and its related components, thereby further extending the service life of the engine.

[0029] It is worth mentioning that the aforementioned metal material can be selected from high-temperature resistant metals, which is beneficial for further reducing the distance between the cooling pipe and the exhaust pipe, thereby reducing the height space occupied by the relevant pipes of the engine.

[0030] By employing the piping assembly provided by this utility model, the cross-section of the cooling pipe is made rectangular, with the height dimension of the cross-section being smaller than the width dimension. This effectively reduces the space occupied by the cooling pipe in the vertical direction while meeting the flow requirements of the cooling pipe. Furthermore, by making the cooling pipe and the first bracket 2 of metal, and at least a portion of the outer wall of the cooling pipe is covered with a metal layer 3, and the cooling pipe is connected to the outer wall of the engine body 4 through the metal layer 3 and the bracket, the temperature resistance requirements of the cooling pipe and its related components, the layout requirements of the cooling piping, and the risk of cooling pipe leakage are met within the existing height space.

[0031] like Figure 1 and Figure 3 As shown, Figure 3 For display Figure 1 A top view of the provided piping assembly. Optionally, when specifically configuring the first cooling pipe 1, the first cooling pipe 1 may include a first bent pipe 11 and a second bent pipe 12 that are connected, and the first bent pipe 11 is connected to the interior of the engine body 4, and the end of the second bent pipe 12 away from the first bent pipe 11 is an open end, which can be used to connect with other pipes.

[0032] It should be noted that the bending angles of the first bent pipe 11 and the second bent pipe 12 can be set according to the actual installation space of the engine, and this utility model does not impose specific limitations. In addition, the end of the first bent pipe 11 away from the second bent pipe 12 can be fixedly connected to the engine body 4 through a flange.

[0033] The piping assembly may further include a second cooling pipe 5 and a second bracket 6. Optionally, the second cooling pipe 5 may include a connected third bend pipe 51 and a fourth bend pipe 52. The third bend pipe 51 communicates with the interior of the engine body 4, and the end of the fourth bend pipe 52 furthest from the third bend pipe 51 is an open end, which can be used to communicate with other pipes. Furthermore, the connection method between the third bend pipe 51 and the engine body 4 can be referenced to the first bend pipe 11, and will not be elaborated further here.

[0034] Meanwhile, along the width direction of the cross-section, the first bend 11 is closer to the engine body 4 than the fourth bend 52. Understandably, this allows for the simultaneous delivery of coolant by multiple cooling pipes while reducing the height space occupied by the cooling pipes.

[0035] And along the height direction of the cross section, also refer to Figure 1 and Figure 4 , Figure 4 For display Figure 3A cross-sectional view along AA shows the second bent pipe 12 and the third bent pipe 51 arranged sequentially. Since the cross-section of the second bent pipe 12 is rectangular and its height dimension is smaller than the diameter of a conventional circular pipe, the height space occupied by the two bent pipes arranged along the height direction can still be effectively reduced. Furthermore, the third bent pipe 51 is connected to the outer wall of the engine body 4 via the second bracket 6. This ensures a stable connection between the second cooling pipe 5 and the engine body 4 while maintaining a small height space occupied by the cooling pipe.

[0036] It is worth mentioning that the cross-section of the second cooling pipe 5 can also be rectangular, with a height of h3 and a width of h4, where h3 < h4. For example, 31mm ≤ h3 ≤ 41mm, 47mm ≤ h4 ≤ 57mm. Meanwhile, when both cooling pipes are arranged simultaneously on the outside of the engine body 4, the height direction of the cross-section of the second cooling pipe 5 can be the same as that of the first cooling pipe 1. That is, along the height direction of the cross-section, the height space occupied by the third bent pipe 51 and the second bent pipe 12, arranged sequentially, can be further compressed, while still meeting the temperature resistance requirements of the cooling pipes, thereby further improving the arrangement requirements of the cooling pipes within a limited space.

[0037] In one alternative implementation, such as Figure 2 and Figure 3 As shown, the piping assembly may further include a first clamp 7, which can be understood as an open annular structure or two interlocking arc-shaped structures. The first bent pipe 11 and the fourth bent pipe 52 are axially inserted into the annulus surrounded by the clamp, and the adjacent sidewalls of the first bent pipe 11 and the fourth bent pipe 52 abut against each other. At the same time, the first clamp 7 is used to clamp the first bent pipe 11 and the fourth bent pipe 52 to further improve the connection stability of the cooling pipe.

[0038] It is worth mentioning that a first protrusion 111 is provided on the side wall of the first bent pipe 11 facing the fourth bent pipe 52, while a second protrusion 521 is provided on the side wall of the fourth bent pipe 52 facing the first bent pipe 11, and the first protrusion 111 and the second protrusion 521 abut against each other. Understandably, the first protrusion 111 and the second protrusion 521 are located within the annulus formed by the first clamp 7, which helps to further improve the connection stability of the first cooling pipe 1 and the second cooling pipe 5.

[0039] In addition, since cooling pipes are generally supplied as a whole by pipe manufacturers, fixing the first cooling pipe 1 and the second cooling pipe 5 with the first clamp 7 not only facilitates the transportation of cooling pipes, but also reduces the assembly cycle of the engine and improves assembly efficiency.

[0040] Continue to refer to Figure 1In one optional implementation, since the engine has an exhaust pipe that generates heat, all engine components must meet certain temperature resistance requirements. Therefore, when specifically arranging the first cooling pipe 1 and the second cooling pipe 5, because the first cooling pipe 1 is made of metal, and the connector used to connect the first cooling pipe 1 to the engine body 4 is also made of metal, both the first cooling pipe 1 and the connector have relatively high temperature resistance. Therefore, along the height direction of the cross-section, the second bend 12 of the first cooling pipe 1 can be positioned closer to the exhaust pipe than the third bend 51 of the second cooling pipe 5. Understandably, at this point, the second cooling pipe 5 is farther from the exhaust pipe than the first cooling pipe 1, thus the second cooling pipe 5 is less affected by the heat generated by the exhaust pipe. Therefore, the material of the second cooling pipe 5 can be selected as metal or plastic according to actual needs to meet the temperature resistance and arrangement requirements of the first cooling pipe 1 and the second cooling pipe 5 within the existing space.

[0041] Continue to refer to Figure 1 and Figure 3 Optionally, the piping assembly may also include a second clamp 8, which is used to clamp the third bend 51 of the second cooling pipe 5. It should be noted that the structure of the second clamp 8 can be referred to the first clamp 7 described above, and will not be repeated here.

[0042] At the same time, refer to Figure 1 and Figure 5 , Figure 5 A structural schematic diagram illustrating the second bracket 6. The second bracket 6 includes a first bent portion 61 and a second bent portion 62 connected together. Exemplarily, the first bent portion 61 and the second bent portion 62 can be plate structures, and the included angle between them is 90°. The first bent portion 61 is exemplaryly connected to the outer wall of the engine body 4 via fasteners, while at least a portion of the second bent portion 62 is disposed between the second bent tube 12 and the third bent tube 51. Specifically, the portion of the second bent portion 62 facing away from the first bent portion 61 can be inserted into the gap between the second bent tube 12 and the third bent tube 51, and the second clamp 8 is exemplaryly connected to the second bent portion 62 via fasteners to further improve the connection stability between the cooling pipe and the engine body 4.

[0043] Optional, such as Figure 4 As shown, the second support 6 also includes a hollowed-out portion 63, that is, while the support meets the strength requirements, through holes can be provided on the surface of the plate structure to reduce the weight of the support.

[0044] It is worth mentioning that during engine operation, the engine will vibrate, which may cause the clamps to move relative to the cooling pipes. Based on this, if... Figure 2 and Figure 4As shown, a flexible pad 9 can be placed between the clamp and the bent pipe to reduce the risk of wear on the cooling pipe caused by the clamp. Specifically, the flexible pad 9 can be directly wrapped onto the surface of the clamp using an adhesive coating process. This effectively reduces relative movement between the flexible pad 9 and the clamp, further reducing the risk of wear on the bent pipe caused by the clamp.

[0045] Furthermore, since the fourth bend 52 of the second cooling pipe 5 is positioned away from the exhaust pipe relative to the second bend 12 of the first cooling pipe 1, the heat generated by the exhaust pipe has a relatively small impact on the flexible pad 9 between the fourth bend 52 and the clamp, meaning the flexible pad 9 can meet the temperature resistance requirements. It should be noted that, as... Figure 6 As shown, Figure 6 For display Figure 3 A schematic diagram of the structure along the Y-axis. Within the existing height space, the installation height of the first bend 11 of the first cooling pipe 1 and the fourth bend 52 of the second cooling pipe 5 can be no lower than the installation height of the second bend 12 of the first cooling pipe 1, so that the flexible pad 9 between the first clamp 7 and the cooling pipe also meets the temperature resistance requirements.

[0046] In one alternative implementation, such as Figure 7 As shown, Figure 7 For display Figure 3 A partial enlarged view at point B. The sidewall of the second cooling pipe 5 also includes at least two limiting protrusions 53. Along the extension direction of the second cooling pipe 5, there is a gap between two adjacent limiting protrusions 53. The second clamp 8 is located in the gap and abuts against the two adjacent limiting protrusions 53 to further reduce the risk of the clamp moving relative to the cooling pipe and improve the connection stability between the clamp and the cooling pipe.

[0047] It should be noted that multiple limiting protrusions 53 can also be provided on the side wall of the first cooling pipe 1. For example, at the location of the first clamp 7, the first cooling pipe 1 can be provided with two limiting protrusions 53, and the corresponding location of the second cooling pipe 5 is also provided with limiting protrusions 53, so as to further improve the connection stability between the first cooling pipe 1 and the second cooling pipe 5. In addition, multiple second clamps 8 can be provided to further improve the installation reliability of the cooling pipes.

[0048] In one alternative implementation, such as Figure 3 As shown, the piping assembly also includes a degassing pipe 010, which is disposed on the side wall of the first cooling pipe 1 and communicates with the first cooling pipe 1 to reduce the internal air pressure of the engine. It is worth mentioning that by integrating the degassing pipe 010 into the cooling pipe, the engine assembly cycle time can be effectively reduced, improving assembly efficiency.

[0049] In summary, the piping assembly provided by this utility model effectively compresses the space occupied by the cooling pipe in the vertical direction while meeting the flow requirements of the cooling pipe by making the cross-section of the cooling pipe rectangular, with the height dimension of the cross-section being smaller than the width dimension of the cross-section. Furthermore, by making the cooling pipe and the first bracket 2 of metal, and at least a portion of the outer wall of the cooling pipe covered with a metal layer 3, and connecting the cooling pipe to the outer wall of the engine body 4 through the metal layer 3 and the bracket, the temperature resistance requirements of the cooling pipe and its related components, the layout requirements of the cooling piping, and the risk of cooling pipe leakage are met within the existing height space.

[0050] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A piping assembly for mounting on the outside of an engine body, characterized in that, The piping assembly includes a first cooling pipe, a first bracket, and a metal layer. The first cooling pipe communicates with the interior of the engine body and is connected to the outer wall of the engine body via the first bracket, wherein: The first cooling pipe has a rectangular cross-section, with a height of h1 and a width of h2, where h1 < h2. Along the circumference of the first cooling pipe, the metal layer covers at least a portion of the first cooling pipe, and the first bracket is connected to the metal layer; the first cooling pipe and the first bracket are made of metal.

2. The piping assembly according to claim 1, characterized in that, The first cooling pipe includes a first bent pipe and a second bent pipe that are connected to each other, and the first bent pipe is used to communicate with the interior of the engine body; The piping assembly also includes a second cooling pipe and a second bracket. The second cooling pipe includes a third bend pipe and a fourth bend pipe that are connected to each other. The third bend pipe is used to communicate with the interior of the engine body. Along the width direction of the cross section, the first bent tube is positioned relative to the fourth bent tube to be close to the engine body; Along the height direction of the cross section, the second bent tube and the third bent tube are arranged in sequence; the third bent tube is connected to the outer wall of the engine body through the second bracket.

3. The piping assembly according to claim 2, characterized in that, The cross-section of the second cooling pipe is rectangular, with a height of h3 and a width of h4, where h3 < h4. The height direction of the cross-section of the second cooling pipe is the same as that of the cross-section of the first cooling pipe.

4. The piping assembly according to claim 3, characterized in that, The piping assembly further includes a first clamp, through which the first bend and the fourth bend pass, and the adjacent sidewalls of the first bend and the fourth bend surrounded by the first clamp abut against each other; the first clamp is used to clamp the first bend and the fourth bend.

5. The piping assembly according to claim 4, characterized in that, The first bent tube has a first protrusion on its side wall facing the fourth bent tube; the fourth bent tube has a second protrusion on its side wall facing the first bent tube, and the first protrusion and the second protrusion abut against each other.

6. The piping assembly according to claim 2, wherein the engine includes an exhaust pipe, characterized in that, Along the height direction of the cross section, the second bend is positioned relative to the third bend to be close to the exhaust pipe.

7. The piping assembly according to claim 6, characterized in that, The pipeline assembly also includes a second clamp, which is used to clamp the third bent pipe; The second bracket includes a first bend and a second bend connected to each other. The first bend is used to connect to the outer wall of the engine body. At least a portion of the second bend is disposed between the second bend tube and the third bend tube and is connected to the second clamp.

8. The piping assembly according to claim 7, characterized in that, The piping assembly also includes a flexible pad, at least a portion of which is located between the second clamp and the third bend.

9. The piping assembly according to claim 7, characterized in that, The sidewall of the second cooling pipe also includes at least two limiting protrusions. Along the extension direction of the second cooling pipe, there is a gap between two adjacent limiting protrusions. The second clamp is located in the gap and abuts against the two adjacent limiting protrusions.

10. The piping assembly according to claim 1, characterized in that, The piping assembly also includes a degassing pipe, which is disposed on the side wall of the first cooling pipe and communicates with the first cooling pipe.

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