Cooler, exhaust gas recirculation system and engine

Abstract

The utility model provides a kind of cooler, waste gas recirculation system and engine, cooler includes cooler main body, cooler further includes precooling structure, precooling structure is connected with cooler main body;Precooling structure includes precooling cooling pipe, heat dissipation piece and precooling shell, precooling shell is set in precooling cooling pipe outside and form first cooling cavity for accommodating first cooling medium between two, to make first cooling medium and the heat exchange of gas into precooling cooling pipe inside;Precooling cooling pipe is communicated with cooler main body, to make the gas after heat exchange of precooling structure into cooler main body and carry out heat exchange;Heat dissipation piece is arranged in precooling cooling pipe and is connected with the inner wall of precooling cooling pipe.The cooler of the utility model solves the problem of low reliability of cooler in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and more specifically, to a cooler, an exhaust gas recirculation system, and an engine. Background Technology

[0002] EGR (Exhaust Gas Recirculation) refers to a method where a portion of the exhaust gas is drawn from the exhaust pipe and then flows back into the engine cylinders through the intake manifold. Because the exhaust gas contains a large amount of inert gases, it dilutes the fresh air-fuel mixture, slowing down the combustion speed. Simultaneously, the exhaust gas recirculation increases the heat capacity of the working fluid during combustion, i.e., increases its specific heat. Both of these factors lower the maximum combustion temperature and effectively suppress NO₂. X The generation of nitrogen oxides in exhaust gas is reduced, as is the tendency for detonation.

[0003] Currently, EGR coolers are used to cool EGR gas. EGR coolers use cooling pipes to reduce the temperature of EGR gas. The cooling pipes are metal pipes used for heat exchange between EGR exhaust gas and coolant.

[0004] However, EGR coolers, especially those used in natural gas engines, have very high EGR intake air temperatures and require high heat exchange performance. They typically use cooling pipes with high heat transfer coefficients. The main board and cooling pipes are subjected to very high thermal stress, which often leads to cracks and leaks at the connection between the EGR cooler intake main board and the cooling pipes, resulting in low cooler reliability. Utility Model Content

[0005] The main objective of this invention is to provide a cooler, an exhaust gas recirculation system, and an engine to solve the problem of low reliability of coolers in the prior art.

[0006] To achieve the above objectives, according to a first aspect of the present invention, a cooler is provided, comprising a cooler body and a precooling structure connected to the cooler body. The precooling structure includes a precooling cooling pipe, a heat dissipation component, and a precooling shell. The precooling shell is sleeved outside the precooling cooling pipe, and a first cooling cavity is formed between the two to accommodate a first cooling medium, so that the first cooling medium exchanges heat with the gas introduced into the precooling cooling pipe. The precooling cooling pipe is connected to the cooler body, so that the gas after heat exchange by the precooling structure enters the cooler body for heat exchange. The heat dissipation component is disposed inside the precooling cooling pipe and connected to the inner wall of the precooling cooling pipe.

[0007] Furthermore, the heat dissipation component includes multiple heat dissipation parts and connecting parts. The multiple heat dissipation parts are connected to the inner wall of the pre-cooling pipe through the connecting parts and are arranged sequentially along the circumference of the pre-cooling pipe. Each heat dissipation part extends from the pipe wall of the pre-cooling pipe to the axis.

[0008] Furthermore, each heat dissipation section includes a first heat dissipation fin, a second heat dissipation fin, and a third heat dissipation fin, all of which are U-shaped structures. The first and second heat dissipation fins are spaced apart along the circumference of the pre-cooling pipe to form two opposite sidewalls of the U-shaped structure. The two ends of the third heat dissipation fin are respectively connected to the first and second heat dissipation fins to form the bottom of the U-shaped structure. The connecting section includes multiple fourth heat dissipation fins, each of which is attached to the inner wall of the pre-cooling pipe. The first and second heat dissipation fins at the opening ends of two adjacent heat dissipation sections are connected through the fourth heat dissipation fins.

[0009] Furthermore, the heat sink has a ring structure, a first flow channel, the outer edge of the heat sink is in contact with the inner wall of the pre-cooling pipe, and multiple second flow channels are formed between the heat sink and the pre-cooling pipe, the multiple second flow channels are arranged around the first flow channel; and / or, the heat sink extends along the axial direction of the pre-cooling pipe and extends from one end of the pre-cooling pipe to the other end.

[0010] Furthermore, the cooler also includes an air inlet chamber, one end of which is connected to the precooling structure and communicates with the precooling cooling pipe, and the other end of which is connected to the cooler body, so that the gas in the precooling cooling pipe enters the cooler body through the air inlet chamber; the air inlet chamber is a bent pipe structure, so that the precooling structure and the cooler body are inclined to each other, and the precooling cooling pipe is inclined to the main cooling pipe of the cooler body.

[0011] Furthermore, the precooling structure and the main body of the cooler are arranged perpendicularly, and the precooling cooling pipe is arranged perpendicularly to the main cooling pipe.

[0012] Furthermore, the precooling structure includes an inlet flange for connection to external components, the inlet flange being disposed at the inlet end of the precooling cooling pipe, and the precooling shell being connected to the inlet flange; and / or, the precooling structure further includes: a first inflow portion, connected to the precooling shell and communicating with the first cooling chamber, so that the first cooling medium enters the first cooling chamber from the first inflow portion; a first outflow portion, connected to the precooling shell and communicating with the first cooling chamber, so that the first cooling medium that has completed heat exchange in the first cooling chamber flows out from the first outflow portion; and / or, the cooler is used to communicate with one flow channel, the precooling structure including one precooling cooling pipe, the precooling cooling pipe communicating with the flow channel; or, the cooler is used to communicate with two flow channels, the precooling structure including two precooling cooling pipes, the two precooling cooling pipes being arranged one-to-one with the two flow channels, and each precooling cooling pipe communicating with the corresponding flow channel.

[0013] Furthermore, the cooler body includes multiple main cooling pipes, an inlet main plate, an outlet main plate, and a main cooling shell. The inlet main plate and the outlet main plate are both connected to the main cooling shell and together they form a second cooling chamber. Multiple main cooling pipes are spaced apart within the second cooling chamber. One end of each main cooling pipe is connected to the inlet main plate, and the other end of each main cooling pipe is connected to the outlet main plate. Each main cooling pipe is a plate-fin type cooling pipe with fins inside; alternatively, the main cooling pipes are dotted pipes. The cooler body also includes a second inflow section and a second outflow section. The second inflow section is connected to the main cooling shell and communicates with the second cooling chamber, allowing the second cooling medium to enter the second cooling chamber from the second inflow section. The second outflow section is connected to the main cooling shell and communicates with the second cooling chamber, allowing the second cooling medium, which has completed heat exchange within the second cooling chamber, to flow out from the second inflow section. The cooler also includes an outlet chamber, which is connected to the main cooling shell and communicates with all multiple main cooling pipes.

[0014] According to a second aspect of the present invention, an exhaust gas recirculation system is provided, including the cooler described above.

[0015] According to a third aspect of the present invention, an engine is provided, including the exhaust gas recirculation system described above.

[0016] The present invention provides a cooler comprising a main body and a pre-cooling structure. EGR exhaust gas flows through the pre-cooling cooling pipe, which contacts a first cooling medium, transferring heat from the exhaust gas to the first cooling medium and reducing the EGR exhaust gas temperature. The pre-cooling cooling pipe contains heat dissipation components, increasing the heat exchange area with the exhaust gas and improving heat exchange performance to minimize the exhaust gas temperature. However, its heat exchange performance is still relatively poor compared to plate-fin cooling pipes and pitted pipes, absorbing relatively less heat from the gas side. Therefore, the temperature and thermal stress are lower, significantly improving thermal fatigue reliability at this location. When the EGR exhaust gas reaches the main body of the cooler, its temperature has already been reduced by the pre-cooling cooling pipe, significantly lowering the main body temperature and thermal stress, and significantly improving thermal fatigue reliability. Therefore, this cooler solves the problem of low cooler reliability and also ensures the heat exchange efficiency of the cooler. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of an embodiment of the cooler according to the present invention is shown;

[0019] Figure 2 It shows Figure 3 A sectional view of the cooler at section AA in the middle;

[0020] Figure 3 It shows Figure 2 A sectional view of the cooler at section BB in the middle;

[0021] Figure 4 It shows Figure 3 A cross-sectional view of the cooler at section C of the cooling unit;

[0022] Figure 5 It shows Figure 3 A cross-sectional view of the cooler at section DD;

[0023] Figure 6 A schematic diagram of the pre-cooling cooling pipe of the cooler according to the present invention is shown;

[0024] Figure 7 A schematic diagram of the heat dissipation component of the cooler according to the present invention is shown;

[0025] Figure 8 A schematic diagram is shown of a main cooling pipe of the cooler according to the present invention, which is a plate-fin type cooling pipe;

[0026] Figure 9 A schematic diagram is shown of a main cooling pipe of the cooler according to the present invention, which is a pitted pipe;

[0027] Figure 10 A top view of an embodiment of the cooler according to the present invention is shown;

[0028] Figure 11 A side view of an embodiment of the cooler according to the present invention is shown;

[0029] Figure 12 A front view of an embodiment of the cooler according to the present invention is shown.

[0030] The above figures include the following reference numerals:

[0031] 100. Cooler body; 200. Pre-cooling structure;

[0032] 1. Inlet flange; 2. Pre-cooling shell; 3. First inlet section; 4. First outlet section; 5. Pre-cooling pipe; 6. Inlet chamber; 7. Inlet main plate; 8. Main cooling pipe; 9. Main cooling shell; 10. Second inlet section; 11. Second outlet section; 12. Outlet main plate; 13. Outlet chamber; 14. Sealing gasket; 15. Fastening bolts;

[0033] 16. Heat sink; 160. Heat dissipation section; 161. First heat sink; 162. Second heat sink; 163. Third heat sink; 164. Fourth heat sink; 165. First flow channel; 166. Second flow channel. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0036] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] This utility model provides a cooler; please refer to [reference needed]. Figures 1 to 12 The system includes a cooler body 100 and a precooling structure 200 connected to the cooler body 100. The precooling structure 200 includes a precooling cooling pipe 5, a heat sink 16, and a precooling shell 2. The precooling shell 2 is sleeved outside the precooling cooling pipe 5, and a first cooling cavity is formed between the two to accommodate a first cooling medium, so that the first cooling medium can exchange heat with the gas introduced into the precooling cooling pipe 5. The precooling cooling pipe 5 is connected to the cooler body 100 so that the gas after heat exchange in the precooling structure 200 can enter the cooler body 100 for heat exchange. The heat sink 16 is disposed inside the precooling cooling pipe 5 and connected to the inner wall of the precooling cooling pipe 5.

[0038] The cooler of this invention includes a cooler body 100 and a pre-cooling structure 200. EGR exhaust gas flows through the pre-cooling cooling pipe 5, which is in contact with a first cooling medium, transferring heat from the exhaust gas to the first cooling medium and reducing the EGR exhaust gas temperature. The pre-cooling cooling pipe 5 contains a heat dissipation component 16, which increases the heat exchange area with the exhaust gas, improving heat exchange performance and minimizing the exhaust gas temperature. However, its heat exchange performance is still relatively poor compared to plate-fin cooling pipes and pitted pipes, absorbing relatively less heat from the gas side. Therefore, the temperature and thermal stress are lower, significantly improving the thermal fatigue reliability at this location. When the EGR exhaust gas reaches the cooler body 100, its temperature has already been reduced by the pre-cooling cooling pipe 5, significantly lowering the temperature and thermal stress of the cooler body 100 and significantly improving thermal fatigue reliability. Therefore, this cooler solves the problem of low cooler reliability and also ensures the heat exchange efficiency of the cooler.

[0039] In this embodiment, the heat sink 16 includes multiple heat dissipation sections 160 and connecting sections. Each heat dissipation section 160 is connected to the inner wall of the pre-cooling pipe 5 via the connecting sections and is arranged sequentially along the circumference of the pre-cooling pipe 5. Each heat dissipation section 160 extends from the pipe wall of the pre-cooling pipe 5 towards its axis. Thus, the arrangement of multiple heat dissipation sections 160 increases the heat exchange area between the heat sink and the exhaust gas, improving heat exchange performance.

[0040] In this embodiment, each heat dissipation section 160 includes a first heat dissipation fin 161, a second heat dissipation fin 162, and a third heat dissipation fin 163, all of which are U-shaped structures. The first heat dissipation fin 161 and the second heat dissipation fin 162 are spaced apart circumferentially along the pre-cooling pipe 5 to form two opposing sidewalls of the U-shaped structure. The two ends of the third heat dissipation fin 163 are respectively connected to the first heat dissipation fin 161 and the second heat dissipation fin 162 to form the bottom of the U-shaped structure. The connecting part includes a plurality of fourth heat dissipation fins 164, each of which is attached to the inner wall of the pre-cooling pipe 5. The first heat dissipation fin 161 and the second heat dissipation fin 162 at the opening ends of two adjacent heat dissipation sections 160 are connected by the fourth heat dissipation fins 164. This arrangement increases the heat exchange area between the heat dissipation section and the exhaust gas, further improving the heat exchange performance.

[0041] In this embodiment, the heat sink 16 has a ring-shaped structure and a first flow channel 165. The outer edge of the heat sink 16 is in contact with the inner wall of the pre-cooling pipe 5, and a plurality of second flow channels 166 are formed between the heat sink 16 and the pre-cooling pipe 5, with the plurality of second flow channels 166 surrounding the first flow channel 165. This arrangement increases the heat exchange area between the heat sink and the exhaust gas, further improving the heat exchange performance.

[0042] In this embodiment, the heat sink 16 extends axially along the precooling pipe 5 and from one end of the precooling pipe 5 to the other. This arrangement further improves the heat exchange performance.

[0043] In this embodiment, the cooler further includes an air inlet chamber 6. One end of the air inlet chamber 6 is connected to the pre-cooling structure 200 and communicates with the pre-cooling pipe 5, and the other end of the air inlet chamber 6 is connected to the cooler body 100, so that the gas in the pre-cooling pipe 5 enters the cooler body 100 through the air inlet chamber 6. This arrangement realizes the connection between the cooler body 100 and the pre-cooling structure 200 and the transmission of gas.

[0044] In this embodiment, the air inlet chamber 6 has a bent pipe structure, so that the precooling structure 200 and the cooler body 100 are inclined to each other, and the precooling cooling pipe 5 is inclined to the main cooling pipe 8 of the cooler body 100. This arrangement can reduce the size of the cooler in the extension direction of the main cooling pipe 8, and on this basis, it can ensure that the size of the precooling cooling pipe 5 is long enough to ensure the heat exchange effect.

[0045] Optionally, the precooling structure 200 and the cooler body 100 are arranged perpendicularly, and the precooling cooling pipe 5 is arranged perpendicularly to the main cooling pipe 8. This arrangement can further reduce the size of the cooler in the extension direction of the main cooling pipe 8, and on this basis, the length of the precooling cooling pipe 5 can be extended further to ensure the heat exchange effect.

[0046] In this embodiment, the precooling structure 200 includes an inlet flange 1 for connection with external components. The inlet flange 1 is disposed at the inlet end of the precooling cooling pipe 5, and the precooling housing 2 is connected to the inlet flange 1. This arrangement facilitates the connection of the inlet flange 1 with external components.

[0047] In this embodiment, the precooling structure 200 further includes: a first inflow section 3, which is connected to the precooling shell 2 and communicates with the first cooling cavity, so that the first cooling medium enters the first cooling cavity from the first inflow section 3; and a first outflow section 4, which is connected to the precooling shell 2 and communicates with the first cooling cavity, so that the first cooling medium that has completed heat exchange in the first cooling cavity flows out from the first outflow section 4.

[0048] In practice, the first inflow section 3 and the first outflow section 4 can be separate parts, or the pre-cooling shell 2 can be integrated into one unit.

[0049] Specifically, the cooler is used to connect to one flow channel, and the precooling structure 200 includes one precooling cooling pipe 5 connected to the flow channel; or, the cooler is used to connect to two flow channels, and the precooling structure 200 includes two precooling cooling pipes 5, which are arranged one-to-one with the two flow channels, and each precooling cooling pipe 5 is connected to its corresponding flow channel. The external component includes one or two flow channels.

[0050] In this embodiment, the cooler body 100 includes a plurality of main cooling pipes 8, an air inlet main plate 7, an air outlet main plate 12, and a main cooling shell 9. The air inlet main plate 7 and the air outlet main plate 12 are both connected to the main cooling shell 9 and together with the main cooling shell 9 form a second cooling chamber. The plurality of main cooling pipes 8 are spaced apart in the second cooling chamber. One end of each main cooling pipe 8 is connected to the air inlet main plate 7, and the other end of each main cooling pipe 8 is connected to the air outlet main plate 12.

[0051] In practice, the intake plate 7 and the exhaust plate 12 are located at the intake and exhaust ends of the cooler body 100, respectively, and are both metal plates used to connect and fix the main cooling pipes 8 together. The intake plate 7 and the exhaust plate 12 are both welded to the main cooling shell 9, or they can be assembled together with bolts or the like.

[0052] Specifically, all main cooling pipes 8 are plate-fin type cooling pipes, with fins installed inside the main cooling pipes 8; or, the main cooling pipes 8 are dotted pipes. In practical implementation, EGR exhaust gas flows through the main cooling pipes 8, and the outside contacts the second cooling medium, transferring the heat of the exhaust gas to the second cooling medium to reduce the temperature of the EGR exhaust gas. Plate-fin type cooling pipe structures or tube bundle structures such as dotted pipes can be used, which have high heat exchange efficiency and can quickly reduce the temperature of the EGR exhaust gas.

[0053] In practice, the plate-fin cooling tubes are flat tubes with internal air-side fins to increase the contact area between the metal and the EGR exhaust gas, resulting in higher heat exchange efficiency. All the main cooling tubes 8 are plate-fin cooling tubes, which have high heat exchange efficiency. Although the temperature is high, they cannot release thermal stress themselves, resulting in poor reliability. However, the temperature of the exhaust gas entering the main body 100 of the cooler has been reduced after pre-cooling.

[0054] In practical implementation, the pitted tube, also called the uneven tube, has small pits (pockmarks) or small protrusions evenly distributed on its surface. It has high heat exchange efficiency and can quickly reduce the temperature of EGR exhaust gas. Although it cannot deform itself, cannot absorb thermal deformation, has high thermal stress, and poor reliability, the temperature of the exhaust gas entering the cooler body 100 has been reduced after pre-cooling.

[0055] In this embodiment, the cooler body 100 further includes a second inflow portion 10 and a second outflow portion 11. The second inflow portion 10 is connected to the main cold shell 9 and communicates with the second cooling chamber so that the second cooling medium enters the second cooling chamber from the second inflow portion 10. The second outflow portion 11 is connected to the main cold shell 9 and communicates with the second cooling chamber so that the second cooling medium that has completed heat exchange in the second cooling chamber flows out from the second inflow portion 10.

[0056] In specific implementation, the flow paths between the first inflow section 3 and the first outflow section 4, and between the second inflow section 10 and the second outflow section 11, can be connected in parallel; the first outflow section 4 and the second inflow section 10 can be directly connected, and the flow paths are connected in series.

[0057] In practice, the second inflow section 10 and the second outflow section 11 can be separate parts or integrated with the main cold housing 9.

[0058] In this embodiment, the cooler also includes an exhaust chamber 13, which is connected to the main cooling housing 9 and is also connected to a plurality of main cooling pipes 8.

[0059] Specifically, both the intake chamber 6 and the exhaust chamber 13 are welded to the main cooling housing 9, or they can be assembled together using fastening bolts 15. Sealing gaskets 14 are provided between the intake chamber 6 and the main cooling housing 9, and between the exhaust chamber 13 and the main cooling housing 9, to achieve sealing between the intake chamber 6 and the main cooling housing 9, and between the exhaust chamber 13 and the main cooling housing 9.

[0060] Specifically, both the first and second cooling media are coolant; optionally, the coolant is water.

[0061] In practice, the EGR exhaust gas enters through the inlet of the inlet flange 1, flows through the pre-cooling pipe 5, is cooled by the pre-cooling pipe 5 (reduced by about 100°C), then passes through the inlet chamber 6 to the inlet main plate 7, then flows through the main cooling pipe 8 and the outlet main plate 12, and finally flows out from the outlet chamber 13.

[0062] Furthermore, the pre-cooling pipe 5 is filled with EGR exhaust gas, and the outside of the pre-cooling pipe 5 is in contact with the first cooling medium, transferring the heat of the exhaust gas to the first cooling medium and reducing the temperature of the EGR exhaust gas. The pre-cooling pipe 5 has heat dissipation components inside, which can increase the heat exchange area between it and the exhaust gas, improve the heat exchange performance, and reduce the exhaust gas temperature as much as possible. However, the heat exchange performance is still worse than that of plate-fin cooling pipes and pitted pipes, and it absorbs relatively less heat from the gas side. Therefore, the temperature and thermal stress are smaller, which can significantly improve the thermal fatigue reliability at this position.

[0063] Furthermore, when the EGR exhaust gas temperature reaches the intake main board 7 position, the temperature has been reduced by the pre-cooling cooling pipe 5 to around 700℃ or lower. The temperature and thermal stress at the intake main board 7 position are significantly reduced, and the thermal fatigue reliability is significantly improved.

[0064] This invention employs a pre-cooling plus main cooling structure. The pre-cooling uses a water jacket and EGR gas pipes. The EGR gas pipes have internal heat sinks to provide initial cooling for the high-temperature gas. The heat sinks increase the heat exchange area between the gas and the EGR exhaust gas, thereby improving heat exchange performance and reducing the EGR exhaust gas temperature by about 100°C. The main cooling uses high-efficiency cooling pipes with high heat exchange performance. Because the pre-cooling has already reduced the EGR exhaust gas temperature, the temperature and thermal stress at the main cooling motherboard and the front end of the cooling pipes are greatly reduced, significantly improving reliability.

[0065] The precooling structure 200 of this utility model is equipped with a corrugated cooling pipe with high reliability and poor heat exchange performance, which focuses on improving reliability. The main body of the cooler 100 uses plate-fin cooling pipes or pitted pipes with high heat exchange performance to ensure high heat exchange performance. Since the precooling part has greatly reduced the temperature of the exhaust gas, there is no problem with reliability. The combination of the two stages improves reliability and maintains high heat exchange performance.

[0066] This invention also provides an exhaust gas recirculation system, including the cooler described in the above embodiment.

[0067] This invention also provides an engine, including the exhaust gas recirculation system described in the above embodiments.

[0068] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0069] The cooler of this invention includes a cooler body 100 and a pre-cooling structure 200. EGR exhaust gas flows through the pre-cooling cooling pipe 5, which is in contact with a first cooling medium, transferring heat from the exhaust gas to the first cooling medium and reducing the EGR exhaust gas temperature. The pre-cooling cooling pipe 5 contains a heat dissipation component 16, which increases the heat exchange area with the exhaust gas, improving heat exchange performance and minimizing the exhaust gas temperature. However, its heat exchange performance is still relatively poor compared to plate-fin cooling pipes and pitted pipes, absorbing relatively less heat from the gas side. Therefore, the temperature and thermal stress are lower, significantly improving the thermal fatigue reliability at this location. When the EGR exhaust gas reaches the cooler body 100, its temperature has already been reduced by the pre-cooling cooling pipe 5, significantly lowering the temperature and thermal stress of the cooler body 100 and significantly improving thermal fatigue reliability. Therefore, this cooler solves the problem of low cooler reliability and also ensures the heat exchange efficiency of the cooler.

[0070] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cooler, comprising a cooler body (100), characterized in that, The cooler also includes a precooling structure (200) connected to the cooler body (100); The precooling structure (200) includes a precooling cooling pipe (5), a heat dissipation component (16), and a precooling shell (2). The precooling shell (2) is sleeved on the precooling cooling pipe (5) and a first cooling cavity is formed between the two to accommodate the first cooling medium, so that the first cooling medium exchanges heat with the gas introduced into the precooling cooling pipe (5). The precooling cooling pipe (5) is connected to the cooler body (100) so that the gas after heat exchange through the precooling structure (200) enters the cooler body (100) for heat exchange. The heat dissipation component (16) is disposed inside the precooling pipe (5) and connected to the inner wall of the precooling pipe (5).

2. The cooler according to claim 1, characterized in that, The heat dissipation component (16) includes multiple heat dissipation parts (160) and connecting parts. The multiple heat dissipation parts (160) are connected to the inner wall of the pre-cooling pipe (5) through the connecting parts and are arranged sequentially along the circumference of the pre-cooling pipe (5). Each heat dissipation part (160) extends from the pipe wall of the pre-cooling pipe (5) to the axis.

3. The cooler according to claim 2, characterized in that, Each of the heat dissipation parts (160) includes a first heat dissipation fin (161), a second heat dissipation fin (162), and a third heat dissipation fin (163), all of which are U-shaped structures. The first heat dissipation fin (161) and the second heat dissipation fin (162) are arranged at intervals along the circumference of the pre-cooling pipe (5) to form two opposite sidewalls of the U-shaped structure. The two ends of the third heat dissipation fin (163) are respectively connected to the first heat dissipation fin (161) and the second heat dissipation fin (162) to form the bottom of the U-shaped structure. The connecting part includes a plurality of fourth heat sinks (164), each of the fourth heat sinks (164) is attached to the inner wall of the pre-cooling pipe (5), and the first heat sink (161) and the second heat sink (162) at the opening ends of two adjacent heat sinks (160) are connected by the fourth heat sinks (164).

4. The cooler according to claim 1, characterized in that, The heat sink (16) has an annular structure and a first flow channel (165). The outer edge of the heat sink (16) is in contact with the inner wall of the pre-cooling pipe (5), and a plurality of second flow channels (166) are formed between the heat sink (16) and the pre-cooling pipe (5). The plurality of second flow channels (166) are arranged around the first flow channel (165); and / or The heat sink (16) extends axially along the precooling pipe (5) and from one end of the precooling pipe (5) to the other end.

5. The cooler according to claim 1, characterized in that, The cooler also includes: An air intake chamber (6) is provided, one end of which is connected to the precooling structure (200) and communicates with the precooling cooling pipe (5), and the other end of which is connected to the cooler body (100) so that the gas in the precooling cooling pipe (5) enters the cooler body (100) through the air intake chamber (6). The air intake chamber (6) has a bent pipe structure so that the precooling structure (200) and the cooler body (100) are inclined to each other, and the precooling cooling pipe (5) is inclined to the main cooling pipe (8) of the cooler body (100).

6. The cooler according to claim 5, characterized in that, The precooling structure (200) and the cooler body (100) are arranged perpendicularly to each other, and the precooling cooling pipe (5) is arranged perpendicularly to the main cooling pipe (8).

7. The cooler according to claim 1, characterized in that, The precooling structure (200) includes an inlet flange (1) for connection to external components, the inlet flange (1) being disposed at the inlet end of the precooling cooling pipe (5), and the precooling housing (2) being connected to the inlet flange (1); and / or The precooling structure (200) also includes: The first inflow section (3) is connected to the precooling shell (2) and communicates with the first cooling chamber, so that the first cooling medium enters the first cooling chamber from the first inflow section (3); The first outlet (4) is connected to the precooling shell (2) and communicates with the first cooling chamber, so that the first cooling medium that has completed heat exchange in the first cooling chamber flows out from the first outlet (4); and / or The cooler is used to connect to one flow channel, and the precooling structure (200) includes one precooling cooling pipe (5) connected to the flow channel; or, the cooler is used to connect to two flow channels, and the precooling structure (200) includes two precooling cooling pipes (5), which are arranged one-to-one with the two flow channels, and each precooling cooling pipe (5) is connected to the corresponding flow channel.

8. The cooler according to claim 1, characterized in that, The main body (100) of the cooler includes multiple main cooling pipes (8), an air inlet main plate (7), an air outlet main plate (12), and a main cooling shell (9). The air inlet main plate (7) and the air outlet main plate (12) are both connected to the main cooling shell (9) and together with the main cooling shell (9) form a second cooling chamber. The multiple main cooling pipes (8) are spaced apart in the second cooling chamber. One end of each main cooling pipe (8) is connected to the air inlet main plate (7), and the other end of each main cooling pipe (8) is connected to the air outlet main plate (12). Among them, multiple main cooling pipes (8) are plate-fin type cooling pipes, and fins are provided inside the main cooling pipes (8); or, the main cooling pipes (8) are pitted pipes; The cooler body (100) further includes a second inlet (10) and a second outlet (11). The second inlet (10) is connected to the main cold shell (9) and communicates with the second cooling chamber, so that the second cooling medium enters the second cooling chamber from the second inlet (10). The second outlet (11) is connected to the main cold shell (9) and communicates with the second cooling chamber, so that the second cooling medium that has completed heat exchange in the second cooling chamber flows out from the second inlet (10). The cooler also includes an air outlet chamber (13), which is connected to the main cooling housing (9) and is connected to a plurality of the main cooling pipes (8).

9. A waste gas recirculation system, characterized in that, The cooler includes any one of claims 1 to 8.

10. An engine, characterized in that, Includes the exhaust gas recirculation system as described in claim 9.

Images