Cooler, exhaust gas recirculation system and engine

Abstract

This invention provides a cooler, an exhaust gas recirculation system, and an engine. The cooler includes: a primary cooling device comprising an intake chamber, multiple first cooling pipes, a first outer casing, and an exhaust chamber. The multiple first cooling pipes are all disposed within the first outer casing and are used for heat exchange with a first cooling medium flowing into the first outer casing. The inlets of the multiple first cooling pipes are connected to the intake chamber, and the outlets of the multiple first cooling pipes are all connected to the exhaust chamber. All first cooling pipes are corrugated pipes. A secondary cooling device includes a second outer casing and second cooling pipes disposed within the second outer casing. The second outer casing is fixedly connected to the exhaust chamber. The second cooling pipes are used for heat exchange with a second cooling medium flowing into the second outer casing, and the inlets of the second cooling pipes are connected to the outlets of the exhaust chamber. This invention solves the problem of low reliability in existing coolers.

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 plate-fin cooling tubes, which subject the intake main plate, cooling tubes, and the fins inside the cooling tubes to very high thermal stress. This often results in malfunctions such as cracking and water leakage at the connection between the EGR cooler intake main plate and the cooling tubes, and cracking and detachment of the air-side fins inside the cooling tubes, leading to 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 primary cooling device including an inlet chamber, a plurality of first cooling pipes, a first outer shell, and an outlet chamber, wherein the plurality of first cooling pipes are all disposed within the first outer shell and are all used for heat exchange with a first cooling medium introduced into the first outer shell, the inlets of the plurality of first cooling pipes are all connected to the inlet chamber, the outlets of the plurality of first cooling pipes are all connected to the outlet chamber, and the plurality of first cooling pipes are all corrugated pipes; a secondary cooling device including a second outer shell and second cooling pipes disposed within the second outer shell, the second outer shell being fixedly connected to the outlet chamber; the second cooling pipes are used for heat exchange with a second cooling medium introduced into the second outer shell, and the inlets of the second cooling pipes are connected to the outlets of the outlet chamber.

[0007] Furthermore, the primary cooling device also includes a first intake main board and a first exhaust main board, both of which are connected to the first housing and together form a first heat exchange chamber; a plurality of first cooling pipes are spaced apart in the first heat exchange chamber, one end of each first cooling pipe is connected to the first intake main board, and the other end of each first cooling pipe is connected to the first exhaust main board.

[0008] Furthermore, the primary cooling device also includes: a first inlet section, connected to the first outer shell and communicating with the first heat exchange chamber, so that the first cooling medium enters the first heat exchange chamber from the first inlet section; and a first outlet section, connected to the first outer shell and communicating with the first heat exchange chamber, so that the first cooling medium that has completed heat exchange in the first heat exchange chamber flows out from the first outlet section.

[0009] Furthermore, the second cooling pipe is a plate-fin type cooling pipe, with fins installed inside the pipe; or, the second cooling pipe is a pitted pipe.

[0010] Furthermore, the secondary cooling device includes multiple second cooling pipes, a second air inlet main board, and a second air outlet main board. Both the second air inlet main board and the second air outlet main board are connected to the second outer shell and together with the second outer shell, they form a second heat exchange chamber. Multiple second cooling pipes are spaced apart in the second heat exchange chamber. One end of each second cooling pipe is connected to the second air inlet main board, and the other end of each second cooling pipe is connected to the second air outlet main board.

[0011] Furthermore, the secondary cooling device also includes a second inlet and a second outlet. The second inlet is connected to the second outer shell and communicates with the second heat exchange chamber, so that the second cooling medium enters the second heat exchange chamber from the second inlet. The second outlet is connected to the second outer shell and communicates with the second heat exchange chamber, so that the second cooling medium that has completed heat exchange in the second heat exchange chamber flows out from the second inlet. And / or, the secondary cooling device also includes an inner air outlet chamber, an outer air outlet chamber, a first sealing ring, and a second sealing ring. One end of the inner air outlet chamber is inserted into the second outer shell and communicates with the outlets of the plurality of second cooling pipes. The other end of the inner air outlet chamber is inserted into the outer air outlet chamber and communicates with the outer air outlet chamber. The second sealing ring is disposed between the inner air outlet chamber and the outer air outlet chamber. The outer air outlet chamber is connected to the second outer shell, and the first sealing ring is disposed between the outer air outlet chamber and the second outer shell.

[0012] Furthermore, the exhaust chamber includes a first connecting portion, and the second housing includes a second connecting portion; the cooler also includes a fastener, and the first connecting portion and the second connecting portion are fixedly connected by the fastener.

[0013] Furthermore, both the first connecting part and the second connecting part are annular structures, and there are multiple fasteners, which are spaced apart circumferentially along the first connecting part and the second connecting part; and / or, the first connecting part is provided with a first fastening hole, the second connecting part is provided with a second fastening hole, the fastener is a bolt, and the bolt is fastened in the first fastening hole and the second fastening hole.

[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 cooler, employing the technical solution of this invention, includes a primary cooling device and a secondary cooling device. EGR exhaust gas enters through the inlet of the primary cooling device's inlet chamber, first flowing through the chamber and multiple first cooling pipes, where it is cooled by approximately 100-200°C. After passing through the outlet chamber, it enters the secondary cooling device, flowing through the second cooling pipes for further cooling before exiting the cooler. The primary cooling device uses corrugated pipes. Because corrugated pipes are expandable and deformable when heated, they do not generate thermal stress due to thermal expansion, significantly improving thermal fatigue reliability. Furthermore, the lower-temperature EGR exhaust gas entering the secondary cooling device avoids malfunctions such as cracking and leakage at the connection points of the second cooling pipes, or cracking of the second cooling pipes themselves. Moreover, the two-stage cooling system ensures the cooler's heat exchange efficiency. Therefore, this cooler exhibits high heat exchange efficiency and also solves the problem of low cooler reliability. 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 partial cross-sectional view of an embodiment of the cooler according to the present invention is shown;

[0019] Figure 2 It shows Figure 1 A schematic diagram of another perspective of an embodiment of the cooler;

[0020] Figure 3 It shows Figure 1 A front view of an embodiment of the cooler in the diagram;

[0021] Figure 4 It shows Figure 1 A top view of an embodiment of the cooler in the diagram;

[0022] Figure 5A first cross-sectional view of an embodiment of the cooler according to the present invention is shown;

[0023] Figure 6 A second cross-sectional view of an embodiment of the cooler according to the present invention is shown;

[0024] Figure 7 A schematic diagram of an embodiment of the cooler according to the present invention is shown;

[0025] Figure 8 It shows Figure 7 A schematic diagram of another perspective of an embodiment of the cooler;

[0026] Figure 9 It shows Figure 7 A front view of an embodiment of the cooler in the diagram;

[0027] Figure 10 It shows Figure 7 A top view of an embodiment of the cooler in the diagram;

[0028] Figure 11 A schematic diagram of the first cooling pipe of the cooler according to the present invention is shown;

[0029] Figure 12 A schematic diagram of the second cooling pipe of the cooler according to the present invention is shown.

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

[0031] 100. Primary cooling unit; 200. Secondary cooling unit;

[0032] 1. Intake chamber; 2. First intake main board; 3. First cooling pipe; 4. First exhaust main board; 5. First outer casing; 6. First inlet section; 7. First outlet section; 8. Exit chamber;

[0033] 9. Second intake main board; 10. Second cooling pipe; 11. Second exhaust main board; 12. Inner exhaust chamber; 13. First sealing ring; 14. Second outer shell; 15. Second inlet section; 16. Second outlet section; 17. Second sealing ring; 18. Outer exhaust chamber; 19. Fastener; 20. Gasket; 21. Fin. 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 primary cooling device 100, comprising an air inlet chamber 1, a plurality of first cooling pipes 3, a first outer shell 5, and an air outlet chamber 8. The plurality of first cooling pipes 3 are all inserted inside the first outer shell 5 and are all used to exchange heat with a first cooling medium introduced into the first outer shell 5. The inlets of the plurality of first cooling pipes 3 are all connected to the air inlet chamber 1, and the outlets of the plurality of first cooling pipes 3 are all connected to the air outlet chamber 8. The plurality of first cooling pipes 3 are all corrugated pipes. A secondary cooling device 200 includes a second outer shell 14 and a second cooling pipe 10 inserted inside the second outer shell 14. The second outer shell 14 is fixedly connected to the air outlet chamber 8. The second cooling pipe 10 is used to exchange heat with a second cooling medium introduced into the second outer shell 14, and the inlet of the second cooling pipe 10 is connected to the outlet of the air outlet chamber 8.

[0038] The cooler of this invention includes a primary cooling device 100 and a secondary cooling device 200. EGR exhaust gas enters through the inlet of the inlet chamber 1 of the primary cooling device 100, first flowing through the chamber of the inlet chamber 1 and multiple first cooling pipes 3, where it is cooled by approximately 100-200°C. It then passes through the outlet chamber 8 and enters the secondary cooling device 200, flowing through the second cooling pipe 10 for further cooling before exiting the cooler. The primary cooling device 100 uses a corrugated pipe. Because the corrugated pipe is expandable and deformable when heated, it does not generate thermal stress due to thermal expansion, significantly improving thermal fatigue reliability. Furthermore, the lower-temperature EGR exhaust gas entering the secondary cooling device 200 avoids malfunctions such as cracking and leakage at the connection points of the second cooling pipe 10, or cracking of the second cooling pipe 10 itself. Moreover, the two-stage cooling system ensures the heat exchange efficiency of the cooler. Therefore, this cooler has high heat exchange efficiency and also solves the problem of low cooler reliability.

[0039] Specifically, both the first and second cooling media are coolant.

[0040] In practice, both the air inlet chamber 1 and the air outlet chamber 8 can be welded to the first outer shell 5, or they can be assembled together with bolts or the like.

[0041] In this embodiment, the primary cooling device 100 further includes a first air inlet main board 2 and a first air outlet main board 4. The first air inlet main board 2 and the first air outlet main board 4 are both connected to the first outer shell 5 and form a first heat exchange chamber with the first outer shell 5. A plurality of first cooling pipes 3 are spaced apart in the first heat exchange chamber. One end of each first cooling pipe 3 is connected to the first air inlet main board 2, and the other end of each first cooling pipe 3 is connected to the first air outlet main board 4.

[0042] In specific implementation, the first air intake main plate 2 and the first air outlet main plate 4 are metal plates located at the air inlet and outlet ends of the first-stage cooling device 100, respectively, used to connect and fix each first cooling pipe 3 together.

[0043] Specifically, the first intake main board 2 and the first exhaust main board 4 are both welded to the first outer casing 5, or they can be assembled together with bolts or the like.

[0044] In this embodiment, the primary cooling device 100 further includes: a first inflow section 6, which is connected to the first outer shell 5 and communicates with the first heat exchange chamber, so that the first cooling medium enters the first heat exchange chamber from the first inflow section 6; and a first outflow section 7, which is connected to the first outer shell 5 and communicates with the first heat exchange chamber, so that the first cooling medium that has completed heat exchange in the first heat exchange chamber flows out from the first outflow section 7.

[0045] In practice, the first inflow section 6 and the first outflow section 7 can be separate parts or integrated with the first outer shell 5.

[0046] Optionally, the second cooling pipe 10 is a plate-fin type cooling pipe, and fins 21 are provided inside the second cooling pipe 10; or, the second cooling pipe 10 is a pitted pipe.

[0047] In practice, the plate-fin cooling tube is a flat tube with air-side fins inside, which increases the contact area between the metal and the EGR exhaust gas, resulting in high heat exchange efficiency and rapid reduction of the EGR exhaust gas temperature.

[0048] In practice, the pitted tube, also called the uneven tube, has small pits (pockmarks) or small bumps evenly distributed on its surface. It has a high heat exchange efficiency and can quickly reduce the temperature of EGR exhaust gas.

[0049] In this embodiment, the secondary cooling device 200 includes a plurality of second cooling pipes 10, a second air inlet main board 9, and a second air outlet main board 11. The second air inlet main board 9 and the second air outlet main board 11 are both connected to the second outer shell 14 and form a second heat exchange chamber with the second outer shell 14. The plurality of second cooling pipes 10 are spaced apart in the second heat exchange chamber. One end of each second cooling pipe 10 is connected to the second air inlet main board 9, and the other end of each second cooling pipe 10 is connected to the second air outlet main board 11.

[0050] In specific implementation, the second air intake main board 9 and the second air outlet main board 11 are metal plates located at the air inlet and outlet ends of the secondary cooling device 200, respectively, used to connect and fix each of the second cooling pipes 10 together.

[0051] Specifically, the second intake main board 9 and the second exhaust main board 11 are both welded to the second outer casing 14, or they can be assembled together with bolts or the like.

[0052] In practice, all of the secondary cooling pipes 10 are plate-fin cooling pipes with high heat exchange efficiency. Although they cannot release thermal stress at high temperatures and have poor reliability, after heat exchange by the primary cooling device 100, the EGR exhaust gas temperature has been cooled and reduced by the primary cooling device 100. The temperature and thermal stress at the position of the secondary intake main board 9 are significantly reduced, and the thermal fatigue reliability is significantly improved. The temperature and thermal stress of the air-side fins at the intake end of the plate-fin cooling pipe are significantly reduced, which can prevent cracking and falling off.

[0053] In practice, all of the secondary cooling pipes 10 are pitted pipes with high heat exchange performance. Although they cannot deform or absorb heat deformation, resulting in high thermal stress and poor reliability, after heat exchange by the primary cooling device 100, the EGR exhaust gas temperature is cooled and reduced by the primary cooling device 100. The temperature and thermal stress at the position of the secondary intake main board 9 are significantly reduced, and the thermal fatigue reliability is significantly improved. Furthermore, the temperature and thermal stress of the pitted pipes are significantly reduced, preventing cracking and failure.

[0054] In this embodiment, the secondary cooling device 200 further includes a second inflow section 15 and a second outflow section 16. The second inflow section 15 is connected to the second outer shell 14 and communicates with the second heat exchange chamber, so that the second cooling medium enters the second heat exchange chamber from the second inflow section 15; the second outflow section 16 is connected to the second outer shell 14 and communicates with the second heat exchange chamber, so that the second cooling medium that has completed heat exchange in the second heat exchange chamber flows out from the second inflow section 15.

[0055] In practice, the second inflow section 15 and the second outflow section 16 can be separate parts or integrated with the second housing 14.

[0056] In this embodiment, the secondary cooling device 200 further includes an inner air outlet chamber 12, an outer air outlet chamber 18, a first sealing ring 13, and a second sealing ring 17. One end of the inner air outlet chamber 12 is inserted into the second outer casing 14 and is connected to the outlets of the plurality of second cooling pipes 10. The other end of the inner air outlet chamber 12 is inserted into the outer air outlet chamber 18 and is connected to the outer air outlet chamber 18. The second sealing ring 17 is disposed between the inner air outlet chamber 12 and the outer air outlet chamber 18 to seal the gap between the inner air outlet chamber 12 and the outer air outlet chamber 18. The outer air outlet chamber 18 is connected to the second outer casing 14, and the first sealing ring 13 is disposed between the outer air outlet chamber 18 and the second outer casing 14 to seal the gap between the outer air outlet chamber 18 and the second outer casing 14.

[0057] Optionally, both the first sealing ring 13 and the second sealing ring 17 are made of rubber.

[0058] In practice, the inner air outlet chamber 12 and the outer air outlet chamber 18 can be welded to the second outer shell 14, or they can be assembled together with bolts or the like.

[0059] In this embodiment, the exhaust chamber 8 includes a first connecting portion, and the second outer casing 14 includes a second connecting portion; the cooler further includes a fastener 19, and the first connecting portion and the second connecting portion are fixedly connected by the fastener 19. This arrangement ensures a reliable connection between the primary cooling device 100 and the secondary cooling device 200.

[0060] In this embodiment, both the first connecting portion and the second connecting portion are annular structures, and there are multiple fasteners 19, which are spaced apart circumferentially along the first connecting portion and the second connecting portion. This arrangement further ensures the reliability of the connection.

[0061] In this embodiment, a first fastening hole is provided on the first connecting part, a second fastening hole is provided on the second connecting part, and the fastener 19 is a bolt, which is fastened in the first fastening hole and the second fastening hole.

[0062] In this embodiment, the cooler further includes a gasket 20, which is disposed between the first connecting portion and the second connecting portion. This arrangement ensures a reliable connection between the first connecting portion and the second connecting portion and avoids wear between the first connecting portion and the second connecting portion.

[0063] In practice, the EGR exhaust gas enters from the inlet of the intake chamber 1, flows through the first intake main board 2 and the first cooling pipe 3, and is cooled by the first cooling pipe to a temperature reduction of about 100-200°C. Then it passes through the first exhaust main board 4 and the exhaust chamber 8 and reaches the second intake main board 9. After passing through the second cooling pipe 10, it passes through the second exhaust main board 11 and the inner exhaust chamber 12 and flows out from the outer exhaust chamber 18.

[0064] It should be noted that the first cooling pipe 3 carries EGR exhaust gas, and its exterior contacts the first cooling medium. This transfers heat from the EGR exhaust gas to the first cooling medium, reducing the EGR exhaust gas temperature. The corrugated surface of the first cooling pipe 3 is expandable and deformable upon thermal expansion, preventing thermal stress and significantly improving thermal fatigue reliability. While the heat exchange efficiency of the corrugated cooling pipe is lower than that of the plate-fin cooling pipe, absorbing relatively less heat from the gas side, less heat is transferred to the first intake main plate 2. This significantly reduces the temperature and thermal stress of the first intake main plate 2, thus noticeably improving thermal fatigue reliability at this location.

[0065] Furthermore, when the EGR exhaust gas temperature reaches the second intake main board 9, the temperature has been reduced by about 100-200°C by the first cooling pipe 3, reaching around 600°C or lower. The temperature and thermal stress at the second intake main board 9 are significantly reduced, and the thermal fatigue reliability is significantly improved. The temperature and thermal stress at the intake end of the first cooling pipe 3 are also significantly reduced, which can prevent cracking.

[0066] This invention employs a staged cooling structure. The first stage uses a shorter corrugated cooling pipe, which has slightly lower heat exchange performance, but it can absorb thermal deformation through the corrugated pipe, resulting in low thermal stress and high reliability. It also reduces the EGR exhaust gas temperature by 100-200℃. The second stage uses plate-fin cooling pipes or other types of cooling pipes, which have high heat exchange performance. Since the first stage has already reduced the EGR exhaust gas temperature, the temperature and thermal stress at the main board position and the front end of the cooling pipe in the second stage are greatly reduced, significantly improving reliability.

[0067] This invention employs a staged cooling system. The first stage uses corrugated cooling pipes with high reliability but poor heat exchange performance to improve reliability. The second stage uses plate-fin cooling pipes or pitted pipes with high heat exchange performance to ensure high heat exchange performance. Since the first stage has already significantly reduced the exhaust gas temperature, reliability is not an issue. The combination of the two stages improves reliability while maintaining high heat exchange performance.

[0068] This invention also provides an exhaust gas recirculation system, including the cooler described in the above embodiments.

[0069] This invention also provides an engine, including the exhaust gas recirculation system described in the above embodiments.

[0070] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0071] The cooler of this invention includes a primary cooling device 100 and a secondary cooling device 200. EGR exhaust gas enters through the inlet of the inlet chamber 1 of the primary cooling device 100, first flowing through the chamber of the inlet chamber 1 and multiple first cooling pipes 3, where it is cooled by approximately 100-200°C. It then passes through the outlet chamber 8 and enters the secondary cooling device 200, flowing through the second cooling pipe 10 for further cooling before exiting the cooler. The primary cooling device 100 uses a corrugated pipe. Because the corrugated pipe is expandable and deformable when heated, it does not generate thermal stress due to thermal expansion, significantly improving thermal fatigue reliability. Furthermore, the lower-temperature EGR exhaust gas entering the secondary cooling device 200 avoids malfunctions such as cracking and leakage at the connection points of the second cooling pipe 10, or cracking of the second cooling pipe 10 itself. Moreover, the two-stage cooling system ensures the heat exchange efficiency of the cooler. Therefore, this cooler has high heat exchange efficiency and also solves the problem of low cooler reliability.

[0072] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0073] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0074] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0075] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0076] 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 chiller characterized by, include: A primary cooling device (100) includes an air inlet chamber (1), a plurality of first cooling pipes (3), a first outer shell (5), and an air outlet chamber (8). The plurality of first cooling pipes (3) are all installed inside the first outer shell (5) and are all used to exchange heat with the first cooling medium introduced into the first outer shell (5). The inlets of the plurality of first cooling pipes (3) are all connected to the air inlet chamber (1), and the outlets of the plurality of first cooling pipes (3) are all connected to the air outlet chamber (8). The plurality of first cooling pipes (3) are all corrugated pipes. The secondary cooling device (200) includes a second housing (14) and a second cooling pipe (10) passing through the second housing (14). The second housing (14) is fixedly connected to the air outlet chamber (8). The second cooling pipe (10) is used to exchange heat with a second cooling medium introduced into the second housing (14). The inlet of the second cooling pipe (10) is connected to the outlet of the air outlet chamber (8).

2. The cooler of claim 1, wherein, The primary cooling device (100) further includes a first air intake main board (2) and a first air outlet main board (4), both of which are connected to the first outer shell (5) and together with the first outer shell (5) form a first heat exchange chamber. Multiple first cooling pipes (3) are spaced apart in the first heat exchange chamber. One end of each first cooling pipe (3) is connected to the first air inlet main board (2), and the other end of each first cooling pipe (3) is connected to the first air outlet main board (4).

3. The cooler of claim 2, wherein, The primary cooling device (100) also includes: The first inflow section (6) is connected to the first outer shell (5) and communicates with the first heat exchange chamber, so that the first cooling medium enters the first heat exchange chamber from the first inflow section (6); The first outlet (7) is connected to the first outer shell (5) and communicates with the first heat exchange chamber, so that the first cooling medium that has completed heat exchange in the first heat exchange chamber flows out from the first outlet (7).

4. The cooler according to claim 1, characterized in that, The second cooling pipe (10) is a plate-fin cooling pipe, and fins (21) are provided inside the second cooling pipe (10); or The second cooling pipe (10) is a pitted pipe.

5. The cooler of claim 1, wherein, The secondary cooling device (200) includes a plurality of second cooling pipes (10), a second air inlet main board (9), and a second air outlet main board (11). The second air inlet main board (9) and the second air outlet main board (11) are both connected to the second outer shell (14) and form a second heat exchange chamber with the second outer shell (14). The plurality of second cooling pipes (10) are spaced apart in the second heat exchange chamber. One end of each second cooling pipe (10) is connected to the second air inlet main board (9), and the other end of each second cooling pipe (10) is connected to the second air outlet main board (11).

6. The cooler according to claim 5, characterized in that, The secondary cooling device (200) further includes a second inlet (15) and a second outlet (16). The second inlet (15) is connected to the second outer shell (14) and communicates with the second heat exchange chamber, so that the second cooling medium enters the second heat exchange chamber from the second inlet (15); the second outlet (16) is connected to the second outer shell (14) and communicates with the second heat exchange chamber, so that the second cooling medium that has completed heat exchange in the second heat exchange chamber flows out from the second inlet (15); and / or The secondary cooling device (200) further includes an inner air outlet chamber (12), an outer air outlet chamber (18), a first sealing ring (13), and a second sealing ring (17). One end of the inner air outlet chamber (12) is inserted into the second outer shell (14) and is connected to the outlets of the plurality of second cooling pipes (10). The other end of the inner air outlet chamber (12) is inserted into the outer air outlet chamber (18) and is connected to the outer air outlet chamber (18). The second sealing ring (17) is disposed between the inner air outlet chamber (12) and the outer air outlet chamber (18). The outer air outlet chamber (18) is connected to the second outer shell (14), and the first sealing ring (13) is disposed between the outer air outlet chamber (18) and the second outer shell (14).

7. The cooler of claim 1, wherein, The air outlet chamber (8) includes a first connecting portion, and the second outer casing (14) includes a second connecting portion; the cooler further includes: Fastener (19) is used to fix the first connecting part and the second connecting part together.

8. The cooler according to claim 7, characterized in that, Both the first connecting portion and the second connecting portion are annular structures, and there are multiple fasteners (19), which are spaced apart circumferentially along the first connecting portion and the second connecting portion; and / or The first connecting part is provided with a first fastening hole, and the second connecting part is provided with a second fastening hole. The fastener (19) is a bolt, and the bolt is fastened in the first fastening hole and the second fastening hole.

9. An exhaust gas recirculation system characterized by, The cooler includes any one of claims 1 to 8.

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

Images