An EGR cooler

Abstract

An EGR cooler, including a shell, an air inlet flange, an air outlet flange and a cooling pipe assembly, the air inlet flange is provided with an air inlet end cover, the air inlet end cover is provided with a second containing cavity, the air outlet flange is provided with an air outlet end cover, the air outlet end cover is provided with a third containing cavity, the shell is provided with a first containing cavity, the cooling pipe assembly is arranged in the first containing cavity, the cooling pipe assembly includes a plurality of connected cooling pipes, the cooling pipe is provided with a fourth containing cavity, the fourth containing cavity is communicated with the second containing cavity and the third containing cavity respectively, the outer wall of the shell is provided with a liquid inlet pipe and a liquid outlet pipe, the EGR cooler provided by the utility model solves the welding position of the high-temperature exhaust gas direct blowing cooling pipe and the main plate in the prior art, because the thickness of the main plate and the thickness of the cooling pipe are inconsistent, the expansion degree of the two after heat deformation is different, the welding position of the cooling pipe and the main plate exists the risk of heat deformation and even fracture, which greatly influences the service life of the EGR cooler.

Description

Technical Field

[0001] This utility model relates to the field of automotive engine technology, and in particular to an EGR cooler. Background Technology

[0002] With the development of automotive technology, automobiles have become widespread, and more and more people are enjoying the convenience they bring. At the same time, energy shortages and environmental pollution have become problems that cannot be ignored. Energy conservation and emission reduction have become the theme of green and sustainable development worldwide. In order to achieve energy conservation and emission reduction, both domestic and foreign countries are constantly raising the emission standards of traditional fuel vehicles, while actively guiding and developing energy-saving new energy vehicles. EGR technology, as one of the key technologies for energy conservation, emission reduction and combustion optimization in automobile engines, is mainly used to reduce nitrogen oxide emissions from internal combustion engines and improve thermal efficiency. It is receiving increasing attention. The EGR system mainly consists of an electronically controlled EGR valve, an EGR bypass valve, an EGR bypass valve vacuum switch and an EGR cooler.

[0003] In existing EGR coolers, the cooling pipe assembly typically consists of multiple cooling pipes. The two ends of the cooling pipe assembly are usually welded to two main boards, which are then welded to the housing. When high-temperature exhaust gas enters the cooling pipes from the inlet, the high-temperature exhaust gas blows directly onto the welded joint between the cooling pipes and the main boards. Because the thickness of the main boards and the cooling pipes are not the same, the degree of thermal deformation and expansion between the two will be different. This will lead to the risk of thermal deformation or even breakage at the welded joint between the cooling pipes and the main boards, which greatly affects the service life of the EGR cooler. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an EGR cooler, which aims to solve the technical problem that in the existing technology, high-temperature exhaust gas blows directly to the welding joint between the cooling pipe and the motherboard. Because the thickness of the motherboard and the thickness of the cooling pipe are not the same, the degree of thermal deformation and expansion between the two will be different, which will lead to the risk of thermal deformation or even breakage at the welding joint between the cooling pipe and the motherboard, which greatly affects the service life of the EGR cooler.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] An EGR cooler includes a housing, an inlet flange, an outlet flange, and a cooling pipe assembly. The inlet flange includes an inlet end cap with a second receiving cavity penetrating through it. The outlet flange includes an outlet end cap with a third receiving cavity penetrating through it. The housing has a first receiving cavity communicating with the second and third receiving cavities. The inlet and outlet end caps are snapped into opposite ends of the first receiving cavity. The cooling pipe assembly is disposed within the first receiving cavity, with opposite ends snapped into the second and third receiving cavities, respectively. The cooling pipe assembly includes a plurality of interconnected cooling pipes. A fourth receiving cavity penetrating each cooling pipe is provided, communicating with both the second and third receiving cavities. An inlet pipe and an outlet pipe are provided on the outer wall of the housing. The first receiving cavity communicates with both the inlet and outlet pipes. The inlet pipe is used to input coolant, and the outlet pipe is used to discharge coolant.

[0007] Furthermore, the air inlet flange also includes an air inlet end plate, the side of the air inlet end cover facing away from the cooling pipe is connected to the air inlet end plate, the air inlet end plate is provided with an air inlet through hole through the air inlet end plate, and the air inlet through hole communicates with the second receiving cavity.

[0008] Furthermore, the vent flange also includes a vent end plate, the side of the vent end cover facing away from the cooling pipe is connected to the vent end plate, the vent end plate is provided with a vent through hole that penetrates the vent end plate, and the vent through hole communicates with the third receiving cavity.

[0009] Furthermore, sealing gaskets are provided on the inner walls of both the air inlet and the air outlet.

[0010] Furthermore, the cooling pipe includes a pipe body, one end of which is snapped into the second receiving cavity, and the other end of which is snapped into the third receiving cavity. A plurality of fins are provided on the inner sidewall of the pipe body, and the fins are distributed in a wavy pattern on the inner sidewall of the pipe body.

[0011] Furthermore, the cooling pipe also includes two baffles, with the two baffles respectively connected to opposite ends of one side wall of the pipe body.

[0012] Furthermore, the cooling pipe also includes a top plate, and the side of the pipe body facing the top of the housing is connected to the top plate.

[0013] Furthermore, two ventilation slots are provided on both sides of the pipe body, penetrating the pipe body. The two ventilation slots are located at opposite ends of the pipe body, and a baffle ventilation slot is provided on the baffle plate.

[0014] Furthermore, both the air inlet end plate and the air outlet end plate are provided with mounting through holes.

[0015] Compared with existing technologies, the advantages of this utility model are as follows: Unlike traditional cooling pipe assemblies, which are typically welded to the main board and then separated by welding the main board to the housing and the inlet and outlet flanges, this utility model connects multiple cooling pipes directly into a single assembly. The assembly is then welded to the inner walls of the inlet and outlet flanges via inlet and outlet end caps, respectively, achieving seamless connection from the inlet to the outlet. This replaces the intermediate role of the two main boards, altering the welding area and effectively increasing the welding surface area. It prevents high-temperature exhaust gases from directly blowing onto the weld between the cooling pipes and the main board. Furthermore, the difference in thickness between the main board and the cooling pipes leads to different degrees of thermal deformation and expansion, posing a risk of thermal deformation or even breakage at the weld. This significantly increases the service life of the EGR cooler. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a schematic diagram of the structure of the EGR cooler according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the cooling pipe structure in the EGR cooler of this utility model embodiment;

[0019] Figure 3 for Figure 2 Enlarged view of point a in the middle;

[0020] Figure 4 This is a schematic diagram of the cross-sectional connection structure of the shell, inlet end cover and cooler assembly in the EGR cooler of this utility model embodiment.

[0021] Explanation of key component symbols:

[0022] 1. Shell; 10. First receiving cavity; 11. Liquid inlet pipe; 12. Liquid outlet pipe; 2. Air inlet flange; 20. Air inlet end cap; 21. Second receiving cavity; 22. Air inlet end plate; 23. Air inlet through hole; 3. Air outlet flange; 30. Air outlet end cap; 31. Third receiving cavity; 32. Air outlet end plate; 33. Air outlet through hole; 4. Cooling pipe assembly; 40. Cooling pipe; 41. Fin; 42. Fourth receiving cavity; 43. Pipe body; 44. Top plate; 45. Baffle; 46. Baffle vent groove; 47. Pipe body vent groove; 5. Sealing gasket; 6. Mounting through hole.

[0023] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0024] To make the objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," "upper," "lower," and similar expressions used herein are for illustrative purposes only and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0026] In this utility model, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0027] Please see Figures 1 to 3An embodiment of this utility model provides an EGR cooler, comprising a housing 1, an inlet flange 2, an outlet flange 3, and a cooling pipe assembly 4. The inlet flange 2 includes an inlet end cap 20, which has a second receiving cavity 21 extending through it. The outlet flange 3 includes an outlet end cap 30, which has a third receiving cavity 31 extending through it. The housing 1 has a first receiving cavity 10 communicating with the second receiving cavity 21 and the third receiving cavity 31. The inlet end cap 20 and the outlet end cap 30 are snapped onto opposite ends of the first receiving cavity 10. The cooling pipe assembly 4 is disposed in the first receiving cavity. Within the first receiving cavity 10, the cooling pipe assembly 4 is disposed within the first receiving cavity 10. The two opposite ends of the cooling pipe assembly 4 are respectively snapped into the second receiving cavity 21 and the third receiving cavity 31. The cooling pipe assembly 4 includes a plurality of interconnected cooling pipes 40. A fourth receiving cavity 42 is disposed within each cooling pipe 40, and the fourth receiving cavity 42 is respectively connected to the second receiving cavity 21 and the third receiving cavity 31. An inlet pipe 11 and an outlet pipe 12 are disposed on the outer wall of the housing 1. The first receiving cavity 10 is respectively connected to the inlet pipe 11 and the outlet pipe 12. The inlet pipe 11 is used to input coolant, and the outlet pipe 12 is used to discharge coolant.

[0028] The air inlet flange 2 also includes an air inlet end plate 22. The side of the air inlet end cover 20 facing away from the cooling pipe 40 is connected to the air inlet end plate 22. An air inlet through hole 23 is provided on the air inlet end plate 22, and the air inlet through hole 23 communicates with the second accommodating cavity 21.

[0029] The vent flange 3 also includes a vent end plate 32. The side of the vent end cover 30 facing away from the cooling pipe 40 is connected to the vent end plate 32. The vent end plate 32 is provided with a vent through hole 33 that penetrates the vent end plate 32. The vent through hole 33 is connected to the third receiving cavity 31.

[0030] Both the air inlet 23 and the air outlet 33 are provided with sealing gaskets 5 on their inner sidewalls. The sealing gaskets 5 can prevent gas from escaping and affecting the performance of the EGR cooler during air intake. Preferably, they are made of materials that are resistant to high temperature, high pressure and corrosion.

[0031] The cooling pipe 40 includes a pipe body 43, one end of which is snapped into the second receiving cavity 21, and the other end of which is snapped into the third receiving cavity 31. A plurality of fins 41 are provided on the inner sidewall of the pipe body 43. The fins 41 are distributed in a wavy pattern on the inner sidewall of the pipe body 43. Preferably, the fins 41 can be made of stainless steel substrate material such as 304L or 316L.

[0032] The cooling pipe 40 also includes two baffles 45, and the two baffles 45 are respectively connected to opposite ends of one side wall of the pipe body 43.

[0033] The cooling pipe 40 also includes a top plate 44. The side of the pipe body 43 facing the top of the housing 1 is connected to the top plate 44. The top plate is located in the first receiving cavity 10, which is filled with coolant. The function of the top plate 44 is to expand the area of ​​the cooling pipe 40, better perform the heat dissipation function, and enable heat transfer to play a better role in the coolant.

[0034] Two ventilation slots 47 are provided on both sides of the pipe body 43, penetrating the pipe body 43. The two ventilation slots 47 are located at opposite ends of the pipe body 43. A baffle ventilation slot 46 is provided on the baffle 45, penetrating the baffle 45. When hot exhaust gas enters the cooling pipe 40, there will be uneven distribution. The pipe ventilation slots 47 and the baffle ventilation slots 46 can divert the gas, making the exhaust gas pass through more evenly and avoiding the situation of concentrated impact on a certain welding area.

[0035] Both the air inlet end plate 22 and the air outlet end plate 32 are provided with mounting through holes 6.

[0036] Specifically, the cooling pipe assembly 4 includes several cooling pipes 40. Taking four cooling pipes 40 as an example, the cooling pipes 40 are first welded together sequentially to form a complete cooling pipe assembly 4. Next, the inner walls of the inlet end cap 20 and the outlet end cap 30 are welded to the opposite ends of the cooling pipe assembly 4, completing an airflow path from the inlet end cap 20 to the cooling pipes 40 to the outlet end cap 30. Finally, the opposite ends of the housing 1 are welded to the outer walls of the inlet end cap 20 and the outlet end cap 30, respectively. Compared with the structure of the traditional EGR cooler, firstly, it eliminates the connection between the two main boards and the cooling pipe assembly 4, saving costs; secondly, in the traditional structure, the welding area between the main board and the cooling pipes 40 has uneven thickness, which can easily cause deformation or even breakage when hot exhaust gas impacts the welding area over time. By using the method of sequentially connecting and welding the cooling pipes 40, and then welding the cooling pipe assembly 4 to the inlet end cap 20 and the outlet end cap 30, the area of ​​the welding zone is expanded, and the stability of the welding zone is increased.

[0037] Then, through the pipe body ventilation groove 47 and the baffle ventilation groove 46 set on the cooling pipe 40, when the high-temperature exhaust gas enters through the inlet flange 2, due to the uneven air distribution, one cooling pipe 40 in the cooling pipe assembly 4 may have more air entering. Through the pipe body ventilation groove 47 on the pipe body 43 and the baffle ventilation groove 46 on the baffle 45, the high-temperature exhaust gas can be transferred to other cooling pipes 40, which can effectively divert the high-temperature exhaust gas and avoid the high-temperature exhaust gas from blowing directly on the weld joint of two cooling pipes 40, which may cause the weld joint to deform or even break due to heat, thus greatly increasing the service life of the EGR cooler.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An EGR cooler, characterized in that... The device includes a housing, an inlet flange, an outlet flange, and a cooling pipe assembly. The inlet flange includes an inlet end cap with a second receiving cavity penetrating through it. The outlet flange includes an outlet end cap with a third receiving cavity penetrating through it. The housing has a first receiving cavity communicating with the second and third receiving cavities. The inlet and outlet end caps are snapped into opposite ends of the first receiving cavity. The cooling pipe assembly is disposed within the first receiving cavity, with opposite ends snapped into the second and third receiving cavities, respectively. The cooling pipe assembly includes several interconnected cooling pipes. A fourth receiving cavity penetrating each cooling pipe is provided, communicating with both the second and third receiving cavities. The outer wall of the housing has an inlet pipe and an outlet pipe, communicating with both the inlet and outlet pipes in the first receiving cavity. The inlet pipe is used to input coolant, and the outlet pipe is used to discharge coolant.

2. The EGR cooler according to claim 1, characterized in that, The air inlet flange also includes an air inlet end plate. The side of the air inlet end cover facing away from the cooling pipe is connected to the air inlet end plate. An air inlet through hole is provided on the air inlet end plate, and the air inlet through hole communicates with the second receiving cavity.

3. The EGR cooler according to claim 2, characterized in that, The vent flange also includes a vent end plate. The side of the vent end cover facing away from the cooling pipe is connected to the vent end plate. A vent through hole is provided on the vent end plate, and the vent through hole communicates with the third receiving cavity.

4. The EGR cooler according to claim 3, characterized in that, Sealing gaskets are provided on the inner walls of both the air inlet and the air outlet.

5. The EGR cooler according to claim 1, characterized in that, The cooling pipe includes a pipe body, one end of which is snapped into the second receiving cavity, and the other end of which is snapped into the third receiving cavity. The inner sidewall of the pipe body is provided with a plurality of fins, which are distributed in a wavy pattern on the inner sidewall of the pipe body.

6. The EGR cooler according to claim 5, characterized in that, The cooling pipe also includes two baffles, with the two baffles respectively connected to opposite ends of one side wall of the pipe.

7. The EGR cooler according to claim 5, characterized in that, The cooling pipe also includes a top plate, and the side of the pipe facing the top of the housing is connected to the top plate.

8. The EGR cooler according to claim 6, characterized in that, Two ventilation slots are provided on both sides of the pipe body, and the two ventilation slots are located at opposite ends of the pipe body. A baffle ventilation slot is provided on the baffle plate.

9. The EGR cooler according to claim 3, characterized in that, Both the air inlet end plate and the air outlet end plate are provided with mounting through holes.

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