EGR cooling device

Abstract

The utility model discloses an EGR (Exhaust Gas Recirculation) cooling device, which comprises an outer shell, an inner shell and an inner shell, the inner shell is fixedly arranged in the hollow inner cavity in an immersed mode, an air chamber is formed between the inner shell and the outer shell, and a labyrinth air channel used for waste gas circulation is formed in the air chamber; a liquid inlet and a liquid outlet which are used for communicating the hollow inner cavity with the outside are formed in the outer shell, and an air inlet and an air outlet which are used for communicating the air chamber with the outside are further formed in the outer shell; the EGR cooling device has good cooling performance, meanwhile, the size of the device can be reduced, and the compactness of the whole structure is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engine component design, and particularly relates to an EGR cooling device. Background Technique

[0002] EGR, i.e., the exhaust gas recirculation system, is a process in which a part of the exhaust gas emitted by the engine is taken out from the exhaust pipe, cooled by an EGR cooler, and then returned to the intake system of the engine, and enters the combustion chamber together with the air-fuel mixture for reuse to reduce air pollution. In the prior art, an EGR cooler generally consists of a housing and a heat dissipation pipe assembly arranged inside the housing. The heat dissipation pipe assembly and the housing form a water chamber, and the cooling of the gas in the air pipe is completed by the coolant in the water chamber. Since the exhaust gas temperature of the engine is high, the existing EGR cooler usually needs to be provided with longer or more heat dissipation pipes to ensure the cooling effect of the cooler, which makes the overall volume of the cooler relatively large and is not conducive to the compact design of the engine.

[0003] Therefore, it is necessary to develop and design a new EGR cooling device, expecting to reduce the device volume while ensuring the cooling performance and improving the compactness of the overall structure. Content of the Utility Model

[0004] In view of this, the purpose of the utility model is to provide an EGR cooling device, which has good cooling performance, and at the same time can help reduce the device volume and improve the compactness of the overall structure.

[0005] To achieve the above purpose, the utility model provides the following technical solution: an EGR cooling device, comprising: an outer housing having a closed hollow inner cavity for storing coolant; an inner housing fixedly arranged in the hollow inner cavity in an immersed manner, and an air chamber is formed between the inner housing and the outer housing, and a labyrinth air passage for the exhaust gas to flow through is arranged in the air chamber; a liquid inlet and a liquid outlet for communicating the hollow inner cavity with the outside are arranged on the outer housing, and an air inlet and an air outlet for communicating the air chamber with the outside are also arranged on the outer housing.

[0006] Further, the outer housing comprises a cylindrical housing with openings at both ends and end caps I and II respectively and sealingly connected to both ends of the cylindrical housing, and the end caps I, II and the cylindrical housing form the hollow inner cavity.

[0007] Further, the inner housing is a barrel-shaped housing with an opening at one end, and the opening end of the inner housing is closed by the end cap II to form the air chamber.

[0008] Further, a convex column abutting against the second end cover is integrally formed at the center of the bottom of the inner shell. A partition plate for partitioning the air chamber is provided between the outer peripheral surface of the convex column and the inner wall surface of the inner shell. A plurality of flow baffle plates I are arranged on the outer peripheral surface of the convex column along its circumferential direction. A plurality of flow baffle plates II which are alternately arranged in a staggered manner with the flow baffle plates I in sequence are provided on the inner wall surface of the inner shell. The convex column, the partition plate, the flow baffle plates I and the flow baffle plates II constitute the labyrinth air passage.

[0009] Further, both the air inlet and the air outlet are located on the second end cover, and the air inlet and the air outlet are respectively arranged on both sides in the thickness direction of the partition plate.

[0010] Further, the first end cover, the second end cover and the cylindrical shell are respectively detachably connected by fasteners. A first sealing gasket is provided between the first end cover and the cylindrical shell. A second sealing gasket is provided between the second end cover and the cylindrical shell. A third sealing gasket is provided between the second end cover and the inner shell. A sunk platform is provided at the open end of the inner shell. A convex platform matching the sunk platform is provided on the second end cover. A fourth sealing gasket is provided between the convex platform and the sunk platform.

[0011] Further, the liquid inlet is located on the first end cover, and the liquid outlet is located on the second end cover.

[0012] Further, a plurality of connecting blocks are evenly arranged on the outer peripheral surface of the inner shell along its circumferential direction, and the connecting blocks are integrally connected with the cylindrical shell.

[0013] Further, the inner shell, the cylindrical shell and the connecting blocks are integrally cast aluminum parts.

[0014] Further, a plurality of heat dissipation strips are respectively provided on the outer surfaces of the first end cover and the second end cover.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] The EGR cooling device provided by the present utility model has good cooling performance, and at the same time can help reduce the volume of the device and improve the compactness of the overall structure. Specifically, by immersing the inner shell in the hollow inner cavity, the exhaust gas in the air chamber can fully exchange heat with the coolant. At the same time, since a labyrinth air passage is provided in the air chamber, the gas flow path is long in a limited space, which is beneficial to ensuring that the overall device has good cooling performance. The device can have good cooling performance on the premise of a small volume. In this device, there is no need to arrange a heat dissipation pipe assembly structure, which is beneficial to reducing the volume of the device and improving the compactness of the overall structure. In addition, the inner shell and the outer shell of the EGR cooling device provided by the present application have simple structures and are convenient to install, which is beneficial to reducing costs.

[0017] Other advantages, objects and features of the present utility model will be described to some extent in the subsequent description, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present utility model. The objects and other advantages of the present utility model can be realized and obtained through the following description. Brief Description of the Drawings

[0018] Figure 1 It is an exploded view of the overall structure of the present utility model

[0019] Figure 2 It is a schematic structural view of the cylindrical housing and the inner housing part

[0020] Reference numerals: 1 - outer housing; 1a - hollow inner cavity; 1b - liquid inlet; 1c - liquid outlet; 1d - air inlet; 1e - air outlet; 101 - cylindrical housing; 102 - end cap I; 102a - heat dissipation strips; 103 - end cap II; 103a - raised platform; 104 - gasket I; 105 - gasket II; 106 - gasket III; 107 - gasket IV; 2 - inner housing; 2a - air chamber; 2a1 - labyrinth air passage; 201 - raised column; 202 - partition plate; 203 - baffle I; 204 - baffle II; 205 - sunk platform; 206 - connecting block; 3 - fastener. Detailed Description of the Preferred Embodiments

[0021] The following specific examples illustrate the embodiments of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that the drawings provided in the following embodiments are only used to illustrate the basic concept of the present utility model. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0022] Please refer to Figure 1-2, in this embodiment, an EGR cooling device is disclosed, which includes: an outer housing 1 having a closed hollow inner cavity 1a for storing coolant; an inner housing 2, the inner housing 2 is fixedly arranged in the hollow inner cavity 1a in a submerged manner, and an air chamber 2a is formed between the inner housing 2 and the outer housing 1, and a labyrinth air passage 2a1 for the exhaust gas to flow through is arranged in the air chamber 2a; an inlet 1b and an outlet 1c for communicating the hollow inner cavity 1a with the outside are arranged on the outer housing 1, and an inlet 1d and an outlet 1e for communicating the air chamber 2a with the outside are also arranged on the outer housing 1; it can be understood that the coolant in the hollow inner cavity 1a is generally water, and the outer housing 1 is also the water jacket. During use, the coolant can be connected to the engine cooling system through the inlet 1b and the outlet 1c for circulating cooling, and the exhaust gas can be connected to the exhaust gas recirculation system through the inlet 1d and the outlet 1e to complete the recycling of the exhaust gas; here, preferably, the inner housing 2 and the outer housing 1 are of an integral structure, and the submerged manner means that the periphery of the inner housing 2 is surrounded by the coolant;

[0023] The EGR cooling device in the above structural design has good cooling performance, and at the same time can help reduce the volume of the device and improve the compactness of the overall structure; specifically, by arranging the inner housing 2 in the hollow inner cavity 1a in a submerged manner, the exhaust gas in the air chamber 2a can fully exchange heat with the coolant. At the same time, since the labyrinth air passage 2a1 is arranged in the air chamber 2a, the gas flow path is long in the limited space, which is beneficial to ensuring that the overall device has good cooling performance; in this device, there is no need to arrange a heat dissipation pipe assembly structure, which is beneficial to reducing the volume of the device and improving the compactness of the overall structure; in addition, the inner housing 2 and the outer housing 1 in this structure are simple in structure and convenient to install, which is beneficial to reducing costs.

[0024] In this embodiment, the outer housing 1 includes a cylindrical housing 101 with openings at both ends and end caps Ⅰ 102 and end caps Ⅱ 103 respectively and sealingly connected to both ends of the cylindrical housing 101. The end caps Ⅰ 102, end caps Ⅱ 103 and the cylindrical housing 101 form the hollow inner cavity 1a; here, the sealing connection method is not limited, and preferably, the method of setting an end face sealing ring is adopted to ensure the sealing performance of the connection part; here, the cylindrical housing 101 preferably adopts a circular or approximately circular cylinder; the outer housing 1 in this structural design is simple and reliable in structure. When processing and manufacturing, the end caps Ⅰ 102, end caps Ⅱ 103 and the cylindrical housing 101 can be made separately, which is beneficial to reducing the manufacturing cost.

[0025] In this embodiment, the inner housing 2 is a barrel-shaped housing with an opening at one end, and the opening end of the inner housing 2 is closed by the end cap Ⅱ 103 to form the air chamber 2a; the inner housing 2 in this structural design is simple in structure and beneficial to processing. At the same time, using the end cap Ⅱ 103 to complete the closing of both the inner housing 2 and the cylindrical housing 101 is beneficial to reducing the number of parts, thereby further reducing the occupied space of the overall device and further reducing the manufacturing cost.

[0026] In this embodiment, a convex column 201 that abuts against the end cover II 103 is integrally formed at the center of the bottom of the barrel of the inner housing 2. A partition plate 202 that partitions the air chamber 2a is provided between the outer peripheral surface of the convex column 201 and the inner wall surface of the inner housing 2. A plurality of flow baffle plates I 203 are arranged on the outer peripheral surface of the convex column 201 along its circumferential direction. A plurality of flow baffle plates II 204 that are alternately arranged in a staggered manner with the flow baffle plates I 203 in sequence are provided on the inner wall surface of the inner housing 2. The convex column 201, the partition plate 202, the flow baffle plates I 203, and the flow baffle plates II 204 constitute the labyrinth air passage 2a1. Preferably, the flow baffle plates I 203 are integrally formed with the convex column 201, and the flow baffle plates II 204 are integrally formed with the inner housing 2. The labyrinth air passage 2a1 in this structural design has a simple structure, which is beneficial to the processing and manufacturing of the overall structure. At the same time, the structural arrangement is reasonable, the overall occupied space is small, which is beneficial to further reducing the volume of the overall device. The heat exchange effect between the labyrinth air passage 2a1 and the coolant is good, which is beneficial to the good cooling and pressure reduction of the exhaust gas.

[0027] In this embodiment, both the air inlet 1d and the air outlet 1e are located on the end cover II 103, and the air inlet 1d and the air outlet 1e are respectively arranged on both sides in the thickness direction of the partition plate 202. Arranging both the air inlet 1d and the air outlet 1e on the end cover II 103 has a simple structure, which is beneficial to the installation of the external pipeline. Arranging the air inlet 1d and the air outlet 1e on both sides in the thickness direction of the partition plate 202 respectively is beneficial to ensuring the maximum circulation path of the exhaust gas, which is beneficial to further improving the cooling performance of the overall device.

[0028] In this embodiment, the end cover I 102, the end cover II 103, and the cylindrical housing 101 are respectively detachably connected by fasteners 3. A sealing gasket I 104 is provided between the end cover I 102 and the cylindrical housing 101. A sealing gasket II 105 is provided between the end cover II 103 and the cylindrical housing 101. A sealing gasket III 106 is provided between the end cover II 103 and the inner housing 2. A sunk platform 205 is provided at the open end of the inner housing 2. A convex platform 103a that matches the sunk platform 205 is provided on the end cover II 103. A sealing gasket IV 107 is provided between the convex platform 103a and the sunk platform 205. Specifically, the fastener 3 here is a screw. Sealing gasket installation grooves are respectively provided at both ends of the cylindrical housing 101, and the sealing gasket I 104 and the sealing gasket II 105 are installed in the corresponding sealing gasket installation grooves. A sealing gasket installation groove is also provided at the open end of the inner housing 2, and the sealing gasket III 106 is installed in the sealing gasket installation groove on the inner housing 2. Each sealing gasket is preferably a rubber sealing gasket. In this structural design, the detachable connection method is beneficial to installation and later maintenance, and the setting of each sealing gasket is beneficial to ensuring the sealing reliability of the connection part.

[0029] In this embodiment, the liquid inlet 1b is located on the end cover I 102, and the liquid outlet 1c is located on the end cover II 103. In this structural design, by arranging the liquid inlet 1b and the liquid outlet 1c on the end cover I 102 and the end cover II 103 respectively, it is beneficial to ensure the full-line circulation of the coolant, with good heat exchange effect, which is conducive to further improving the cooling effect. Thus, on the premise of specific cooling performance requirements, the volume of the overall device can be appropriately reduced.

[0030] In this embodiment, a plurality of connecting blocks 206 are evenly arranged on the outer peripheral surface of the inner shell 2 along its circumferential direction, and the connecting blocks 206 are integrally connected with the cylindrical shell 101. Specifically, there are three connecting blocks 206 here. In this structural design, the processing is simple, which is beneficial to ensuring the connection stability between the inner shell 2 and the outer shell.

[0031] In this embodiment, the inner shell 2, the cylindrical shell 101 and the connecting blocks 206 are integrally cast aluminum parts. The structure is simple and reliable, with a small probability of failure and low maintenance cost, which is beneficial to lightweight design.

[0032] In this embodiment, a plurality of heat dissipation strips 102a are respectively arranged on the outer surfaces of the end cover I 102 and the end cover II 103. By arranging the heat dissipation strips 102a, the heat dissipation area can be increased, thereby further improving the cooling performance of the overall device. Thus, on the premise of specific cooling performance requirements, the volume of the overall device can be further appropriately reduced, and the compactness of the overall device can be improved.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An EGR cooling device, characterized in that, Comprising: An outer housing (1) having a closed hollow inner cavity (1a) for storing coolant; An inner housing (2) fixedly arranged in the hollow inner cavity (1a) in a submerged manner, and an air chamber (2a) is formed between the inner housing (2) and the outer housing (1), and a labyrinth air passage (2a1) for the flow of exhaust gas is provided in the air chamber (2a); The outer housing (1) is provided with a liquid inlet (1b) and a liquid outlet (1c) for communicating the hollow inner cavity (1a) with the outside, and the outer housing (1) is further provided with an air inlet (1d) and an air outlet (1e) for communicating the air chamber (2a) with the outside; The outer housing (1) includes a cylindrical housing (101) with openings at both ends and end caps Ⅰ (102) and end caps Ⅱ (103) respectively and sealingly connected to both ends of the cylindrical housing (101), and the end caps Ⅰ (102), end caps Ⅱ (103) and the cylindrical housing (101) form the hollow inner cavity (1a); The inner housing (2) is a barrel-shaped housing with an opening at one end, and the opening end of the inner housing (2) is closed by the end cap Ⅱ (103) to form the air chamber (2a).

2. The EGR cooling device according to claim 1, wherein: A convex column (201) abutting against the end cap Ⅱ (103) is integrally formed at the center of the bottom of the barrel of the inner housing (2). A partition plate (202) for partitioning the air chamber (2a) is provided between the outer peripheral surface of the convex column (201) and the inner wall surface of the inner housing (2). A plurality of baffle plates Ⅰ (203) are arranged along the circumferential direction of the outer peripheral surface of the convex column (201), and a plurality of baffle plates Ⅱ (204) are arranged on the inner wall surface of the inner housing (2) in an alternating and staggered manner with the baffle plates Ⅰ (203) in sequence. The convex column (201), the partition plate (202), the baffle plates Ⅰ (203) and the baffle plates Ⅱ (204) constitute the labyrinth air passage (2a1).

3. The EGR cooling device according to claim 2, characterized in that: Both the air inlet (1d) and the air outlet (1e) are located on the end cap Ⅱ (103), and the air inlet (1d) and the air outlet (1e) are respectively arranged on both sides in the thickness direction of the partition plate (202).

4. The EGR cooling device according to claim 2, wherein: The end cap Ⅰ (102), the end cap Ⅱ (103) and the cylindrical housing (101) are respectively detachably connected by fasteners (3). A sealing gasket Ⅰ (104) is provided between the end cap Ⅰ (102) and the cylindrical housing (101), a sealing gasket Ⅱ (105) is provided between the end cap Ⅱ (103) and the cylindrical housing (101), and a sealing gasket Ⅲ (106) is provided between the end cap Ⅱ (103) and the inner housing (2); A sunk platform (205) is provided at the opening end of the inner housing (2), a convex platform (103a) matching the sunk platform (205) is provided on the end cap Ⅱ (103), and a sealing gasket Ⅳ (107) is provided between the convex platform (103a) and the sunk platform (205).

5. The EGR cooling device according to claim 1, wherein: The liquid inlet (1b) is located on the end cap Ⅰ (102), and the liquid outlet (1c) is located on the end cap Ⅱ (103).

6. The EGR cooling device according to claim 1, characterized in that: A plurality of connecting blocks (206) are evenly arranged along the circumferential direction on the outer peripheral surface of the inner housing (2), and the connecting blocks (206) are integrally connected with the cylindrical housing (101).

7. The EGR cooling device according to claim 6, characterized in that: The inner housing (2), the cylindrical housing (101) and the connecting block (206) are integrally cast aluminum parts.

8. The EGR cooling device according to claim 1, characterized in that: A plurality of heat dissipation strips (102a) are respectively arranged on the outer surfaces of the end cover I (102) and the end cover II (103).

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