Heat exchanger and power converter thereof

Abstract

The utility model discloses a heat exchanger and a power converter thereof, the heat exchanger is provided with at least one first channel and at least one second channel, and the first channel and the second channel are stacked; the first channel is provided with a first air inlet and a first air outlet, and the first air inlet and the first air outlet are suitable for being communicated with a closed cavity of the power converter so that the first channel can be communicated with the closed cavity. The second channel is provided with a second air inlet and a second air outlet so that the second channel can communicate with the outside. Furthermore, heat exchange is realized through the high-temperature gas in the first channel and the low-temperature gas in the second channel, so that the temperature in the closed cavity of the power converter can be quickly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange, and in particular to a heat exchanger and a power converter thereof. Background Art

[0002] The protection level of the closed cavity of the power converter has reached IP66. The main heat-generating devices inside the closed cavity are power devices and magnetic devices. In the actual operation of the power converter, the increase in temperature inside the closed cavity will cause the devices to work in the first environment for a long time, which will have a great impact on the service life of the devices. Therefore, it is particularly important to control the temperature inside the cavity.

[0003] In the related art, a turbulent fan is usually arranged inside the closed cavity of the power converter to make the air in the closed cavity flow, which is conducive to making the temperature inside the closed cavity more uniform, thereby reducing the temperature around the power device and the magnetic device, and naturally dissipating the heat to the external environment through the closed cavity shell. Furthermore, a heat-conducting device, such as a heat dissipation fin, is arranged outside the shell to accelerate the natural heat dissipation speed of the shell.

[0004] However, as the power of the power converter increases, the heat generated per unit volume also increases. It is becoming increasingly difficult to effectively reduce the temperature in the closed cavity by providing a turbulent fan inside the closed cavity and a heat-conducting device outside the shell. Summary of the invention

[0005] An object of the present invention is to provide a heat exchanger that is useful for quickly reducing the temperature in a closed cavity of a power converter.

[0006] Another object of the present invention is to provide a power converter having the above-mentioned heat exchanger.

[0007] In order to achieve at least one of the above purposes, the technical solution adopted by the present invention is: a heat exchanger, the heat exchanger having at least one first channel and at least one second channel, the first channel and the second channel are stacked; the first channel has a first air inlet and a first air outlet, the first air inlet and the first air outlet are suitable for being respectively connected to the closed cavity of the power converter, so that the first channel and the closed cavity are connected; the second channel has a second air inlet and a second air outlet, so that the second channel is connected to the outside.

[0008] As a preference, a plurality of the first channels and a plurality of the second channels extend along a first direction, and the first channels and the second channels are alternately stacked along a third direction; the first air inlet and the first air outlet of each of the first channels are located on a side of the heat exchanger along the second direction, and the first air inlet and the first air outlet are spaced apart along the first direction, so that the first air inlet and the first air outlet are respectively connected to the closed cavity of the power converter; the second air inlet of each of the second channels is located at one end of the heat exchanger along the first direction, and the second air outlet of each of the second channels is located at the other end of the heat exchanger along the first direction, so that the second channel is connected to the outside.

[0009] As a preference, the first air outlet and the second air inlet are arranged adjacent to each other, and the first air inlet and the second air outlet are arranged adjacent to each other, so that the airflow in the first channel and the airflow in the second channel flow in opposite directions in the first direction.

[0010] As a preference, the heat exchanger includes a main body and two mounting parts, the main body having two end faces arranged opposite to each other along a first direction, and a mounting surface along a second direction; the first channel and the second channel are alternately stacked on the main body along a third direction; the first air inlet and the first air outlet are arranged on the mounting surface at intervals along the first direction; the second air inlet is located on one of the end faces, and the second air outlet is located on the other end face; the mounting part is located on the mounting surface, for connecting to a power converter, wherein one of the mounting parts is suitable for making each of the first air inlets sealed and connected to a closed cavity, and the other of the mounting parts is suitable for making each of the first air outlets sealed and connected to a closed cavity.

[0011] Preferably, the main body includes two end plates and a plurality of first main body members arranged between the two end plates, the first main body members are arranged at intervals along a third direction, one of the first channel and the second channel is arranged on the first main body member, and the other is arranged between two adjacent first main body members, so that the first channel and the second channel are alternately arranged along the third direction.

[0012] Preferably, the end plate has a plurality of spaced-apart closing strips, and ventilation holes are formed between two adjacent closing strips. The closing strips are suitable for sealing both ends of the first channel along the first direction, and the ventilation holes enable both ends of the second channel along the first direction to be connected with the outside to form the second air inlet and the second air outlet.

[0013] Preferably, the main body further includes a plurality of second main body members, which extend along the first direction and are arranged between two adjacent first main body members to connect the two adjacent first main body members.

[0014] As a preference, the first main body, the second main body and the mounting portion are integrally formed.

[0015] Preferably, the heat exchanger further includes a closed chamber fan and a heat dissipation chamber fan, the closed chamber fan is arranged at the first air inlet and / or the first air outlet, so that the airflow in the first channel flows from the first air inlet to the first air outlet; the heat dissipation chamber fan is arranged at the second air inlet and / or the second air outlet, so that the airflow in the second channel flows from the second air inlet to the second air outlet.

[0016] In order to achieve at least one of the above purposes, the technical solution adopted by the present invention is: a power converter, comprising: a converter body, the converter body having a closed cavity; at least one heat exchanger as described above, the first air inlet and the first air outlet of the heat exchanger being connected to the closed cavity.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The first channel of the heat exchanger is connected to the closed cavity of the power converter, and the second channel is connected to the outside, and the first channel and the second channel are stacked, so that the high-temperature gas in the first channel and the low-temperature gas in the second channel can achieve heat exchange, which is beneficial to quickly reduce the temperature in the closed cavity of the power converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of a heat exchanger according to some embodiments of the present application;

[0020] Figure 2 is an exploded view of a heat exchanger according to some embodiments of the present application;

[0021] Figure 3 is a schematic structural diagram of a mounting portion of a heat exchanger according to some embodiments of the present application;

[0022] Figure 4 is a schematic structural diagram of a mounting portion of a heat exchanger according to other embodiments of the present application;

[0023] Figure 5 is a structural schematic diagram of a first main body of a heat exchanger according to some embodiments of the present application;

[0024] Figure 6 is a partial exploded view of a heat exchanger according to some other embodiments of the present application;

[0025] Figure 7 is a partial exploded view of a heat exchanger according to some other embodiments of the present application;

[0026] Figure 8 is a schematic structural diagram of an end plate of a heat exchanger according to some embodiments of the present application;

[0027] Fig. 9 is a schematic structural diagram of a heat exchanger according to other embodiments of the present application;

[0028] Fig.10 is an exploded view of a heat exchanger according to some other embodiments of the present application;

[0029] Fig.11 It is a schematic diagram of the structure of a power converter according to the present application.

[0030] In the figure: 1. heat exchanger; 10. main body; 11. first channel; 111. first air inlet; 112. first air outlet; 12. second channel; 121. second air inlet; 122. second air outlet; 13. first main body; 14. second main body; 15. end plate; 151. closing strip; 1511. positioning structure; 152. ventilation hole; 16. bottom plate; 17. top plate; 20. mounting part; 21. connecting hole; 22. connecting cavity; 23. mounting hole; 24. sealing groove; 25. sealing member; 31. closed cavity fan; 32. heat dissipation cavity fan; 40. heat exchange core; 2. power converter; 50. converter body; 60. closed cavity. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0032] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0033] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0034] A heat exchanger 1, such as Figure 1 and Figure 2 As shown, the heat exchanger 1 has at least one first channel 11 and at least one second channel 12, and the first channel 11 and the second channel 12 are stacked; the first channel 11 has a first air inlet 111 and a first air outlet 112, and the first air inlet 111 and the first air outlet 112 are suitable for being connected to the closed cavity 60 of the power converter 2 respectively, so that the first channel 11 and the closed cavity 60 are connected; the second channel 12 has a second air inlet 121 and a second air outlet 122, so that the second channel 12 is connected to the outside.

[0035] It can be understood that the first channel 11 of the heat exchanger 1 is connected to the closed cavity 60 of the power converter 2 through the first air inlet 111 and the first air outlet 112, so that the high-temperature gas in the closed cavity 60 can flow in the first channel 11, and the second channel 12 is connected to the outside through the second air inlet 121 and the second air outlet 122, so that the low-temperature gas in the outside can flow in the second channel 12. Furthermore, the first channel 11 and the second channel 12 are stacked, so that the high-temperature gas in the first channel 11 and the low-temperature gas in the second channel 12 can achieve heat exchange, which is beneficial to quickly reduce the temperature of the high-temperature gas, and thus quickly reduce the temperature in the closed cavity 60 of the power converter 2.

[0036] In some embodiments, Figure 1 and Figure 2 As shown, a plurality of first channels 11 and a plurality of second channels 12 extend along a first direction, and the first channels 11 and the second channels 12 are alternately stacked along a third direction. It can be understood that the alternate stacking of a plurality of first channels 11 and a plurality of second channels 12 is conducive to increasing the heat exchange area, thereby improving the heat exchange efficiency between the high-temperature gas in the first channels 11 and the low-temperature gas in the second channels 12, and is conducive to quickly reducing the temperature in the closed cavity 60 of the power converter 2.

[0037] Furthermore, the first air inlet 111 and the first air outlet 112 of each first channel 11 are located on a side surface of the heat exchanger 1 along the second direction (eg Figure 1 and Figure 2The heat exchanger 1 is installed on the outside of the power converter 2. Compared with arranging the first air inlet 111 and the first air outlet 112 on different sides, in this embodiment, arranging the first air inlet 111 and the first air outlet 112 on the same side of the heat exchanger 1 is conducive to simplifying the structure of the heat exchanger 1, and by arranging the side of the heat exchanger 1 provided with the first air inlet 111 and the first air outlet 112 opposite to the power converter 2, it is easy to install.

[0038] Furthermore, the second air inlet 121 of each second channel 12 is located at one end of the heat exchanger 1 along the first direction, and the second air outlet 122 of each second channel 12 is located at the other end of the heat exchanger 1 along the first direction, so that the second channel 12 is connected to the outside. In other words, the low-temperature gas in the second channel 12 can flow along the first direction, and the high-temperature gas in the first channel 11 is suitable for entering and exiting the first channel 11 along the second direction, and flowing in the first channel 11 along the first direction.

[0039] It is understandable that if Figure 1 As shown, the first air inlet 111 and the first air outlet 112 are arranged on one side of the heat exchanger 1 along the second direction, and the second air inlet 121 and the second air outlet 122 are arranged at both ends of the heat exchanger 1 along the first direction. When the heat exchanger 1 is installed outside the power converter 2, the power converter 2 is located on one side of the heat exchanger 1 along the second direction, so as to avoid the power converter 2 blocking the second air inlet 121 and the second air outlet 122, which is conducive to reducing the influence of the heat exchanger 1 on the circulation of low-temperature gas. In addition, the first channel 11 and the second channel 12 both extend along the first direction, that is, both extend along the long side direction of the heat exchanger 1, which is conducive to extending the travel of the high-temperature gas in the first channel 11, and extending the travel of the low-temperature gas in the second channel 12, thereby facilitating sufficient heat exchange between the high-temperature gas and the low-temperature gas.

[0040] In some embodiments, Figure 1 As shown, the first air outlet 112 and the second air inlet 121 are arranged adjacent to each other, and the first air inlet 111 and the second air outlet 122 are arranged adjacent to each other, so that the airflow in the first channel 11 and the airflow in the second channel 12 flow in opposite directions in the first direction. In other words, the first air outlet 112 is arranged at one end close to the second air inlet 121, and the first air inlet 111 is arranged at one end close to the second air outlet 122, so that the high-temperature gas and the low-temperature gas flow in the first direction in reverse, which is conducive to increasing the average temperature difference between the high-temperature gas and the low-temperature gas, further improving the efficiency of heat exchange, and is conducive to quickly reducing the temperature in the closed cavity 60 of the power converter 2.

[0041] In some embodiments, Figure 2 As shown, the heat exchanger 1 includes a main body 10 and two mounting parts 20, the main body 10 has two end faces arranged opposite to each other along a first direction, and a mounting surface along a second direction; the first channel 11 and the second channel 12 are alternately stacked on the main body 10 along a third direction; the first air inlet 111 and the first air outlet 112 are arranged on the mounting surface at intervals along the first direction; the second air inlet 121 is located on one of the end faces, and the second air outlet 122 is located on the other end face; the mounting part 20 is arranged on the mounting surface for connecting with the power converter 2, wherein one mounting part 20 is suitable for making each first air inlet 111 sealed and connected with the closed cavity 60, and the other mounting part 20 is suitable for making each first air outlet 112 sealed and connected with the closed cavity 60.

[0042] That is to say, each second air inlet 121 is spaced along the third direction and located at one end of the main body 10 along the first direction, and each second air outlet 122 is spaced along the third direction and located at the other end of the main body 10 along the first direction, so that each first channel 11 is connected to the outside, thereby allowing low-temperature gas to flow through the first channel 11 from the second air inlet 121 to the second air outlet 122 along the first direction. Further, each first air inlet 111 is spaced along the third direction and located at one end of the mounting surface along the first direction, and each first air outlet 112 is spaced along the third direction and located at the other end of the mounting surface along the first direction, thereby allowing high-temperature gas to flow into and out of the second channel 12 along the second direction. It can be understood that the high-temperature gas flows in the second channel 12 along the first direction.

[0043] Furthermore, through the two mounting parts 20, the main body 10 of the heat exchanger 1 is connected to the power converter 2, and each first air inlet 111 and each first air outlet 112 are sealed and communicated with the closed cavity 60. In other words, the mounting part 20 not only connects the heat exchanger 1 and the power converter 2, but also makes each first air inlet 111 or each first air outlet 112 sealed and communicated with the closed cavity 60, which is conducive to reducing additional connection structures or sealing structures, making the structure of the heat exchanger 1 simpler and more compact.

[0044] In a specific embodiment, Figure 2 and Figure 3 As shown, the mounting portion 20 is provided with a plurality of connecting holes 21 arranged at intervals along the third direction. When the mounting portion 20 and the main body 10 are connected to each other, the connecting holes 21 and the first air inlet 111 or the first air outlet 112 are arranged relative to each other in the second direction, so that the high-temperature gas can enter the first channel 11 from the first air inlet 111 through the connecting holes 21, and the high-temperature gas after cooling can enter the closed cavity 60 from the first air outlet 112 through the connecting holes 21.

[0045] In another specific embodiment, Figure 4 As described above, the mounting portion 20 is annular and has a connecting cavity 22 that penetrates along the second direction. When the mounting portion 20 is sealed to connect the main body 10 and the power converter 2, the mounting portion 20 envelops each first air inlet 111, or envelops each first air outlet 112, and the connecting cavity 22 is able to achieve convergence. In other words, the high-temperature gas in the closed cavity 60 of the power converter 2 first passes through the connecting cavity 22 of one mounting portion 20, and then is divided and flows into each first channel 11 from each first air inlet 111. The high-temperature gas after cooling first passes through the connecting cavity 22 of another mounting portion 20, and then enters the closed cavity 60 after convergence.

[0046] It is understandable that the mounting portion 20 can be connected to the main body 10 in an undetachable manner, such as by welding or bonding, which is conducive to improving the sealing between the mounting portion 20 and the main body 10 to reduce the risk of high-temperature gas leakage. The mounting portion 20 can also be connected to the main body 10 in a detachable manner, and a sealing member 25, such as a sealing ring, is provided between the mounting portion 20 and the main body 10 to reduce the risk of high-temperature gas leakage. Preferably, the mounting portion 20 and the main body 10 are welded.

[0047] Similarly, the mounting portion 20 can be connected to the power converter 2 in an undetachable manner, such as by welding, bonding, etc., which is conducive to improving the sealing between the mounting portion 20 and the power converter 2 to reduce the risk of high-temperature gas leakage. The mounting portion 20 can also be detachably connected to the power converter 2, and a sealing member 25, such as a sealing ring, is provided between the mounting portion 20 and the power converter 2 to reduce the risk of high-temperature gas leakage. Preferably, a mounting hole 23 is provided on the mounting portion 20, so that it can be connected to the power converter 2 through a fastener, and a sealing groove 24 for installing a sealing ring is provided on the edge of the mounting portion 20 facing the power converter 2.

[0048] In some embodiments, Figure 8 As shown, Figure 6-Figure 7 As shown, the main body 10 includes two end plates 15 and a plurality of first main body members 13 arranged between the two end plates 15, the first main body members 13 are arranged at intervals along the third direction, one of the first channel 11 and the second channel 12 is arranged on the first main body member 13, and the other is arranged between two adjacent first main body members 13, so that the first channel 11 and the second channel 12 are alternately arranged along the third direction.

[0049] Further, such as Figure 8 As shown, the end plate 15 has a plurality of spaced-apart closing strips 151, and ventilation holes 152 are formed between two adjacent closing strips 151. The closing strips 151 are suitable for sealing the two ends of the first channel 11 along the first direction. The ventilation holes 152 enable the two ends of the second channel 12 along the first direction to communicate with the outside to form a second air inlet 121 and a second air outlet 122.

[0050] In a specific embodiment, Figure 7 As shown, the first main body 13 is a tubular profile, and the cross section of the first main body 13 perpendicular to the first direction is rectangular to form a second channel 12 running through the first direction. It can be understood that one end of the first main body 13 has a second air inlet 121, and the other end has a second air outlet 122. Further, a plurality of first main bodies 13 are arranged along the third direction and fixed between two end plates 15, thereby forming a gap space between two adjacent first main bodies 13. Further, by setting a top plate 17 and a bottom plate 16 opposite to each other along the second direction, the gap space can be closed to form the first channel 11. Specifically, the length of the bottom plate 16 along the first direction is consistent with the length of the first main body 13 along the first direction, so as to close one side of the gap space along the second direction, and the length of the top plate 17 along the first direction is less than the length of the first main body 13 along the first direction, so as to close the middle area of ​​the other side of the gap space along the second direction, and form the first air inlet 111 and the first air outlet 112 at both ends of the side. The ventilation holes 152 on the end plate 15 are arranged relative to the first main body 13 along the first direction, so that the second air inlet 121 and the second air outlet 122 are connected to the outside through the ventilation holes 152; the closing strip 151 on the end plate 15 is arranged relative to the gap space along the first direction, so as to close the two ends of the first channel 11 along the first direction.

[0051] In another specific embodiment, Figure 5 and Figure 6 As shown, the first main body 13 extends along the first direction, and in a plane perpendicular to the first direction, the cross section of the middle section of the first main body 13 is rectangular, so as to form the first channel 11; the cross sections of the two ends of the first main body 13 are "U"-shaped, so as to form a first air inlet 111 at one end of the first main body 13 and a first air outlet 112 at the other end. Furthermore, a plurality of first main bodies 13 are arranged along the third direction and fixed between two end plates 15, so as to form a gap space between two adjacent first main bodies 13. Furthermore, by setting a top plate 17 and a bottom plate 16 opposite to each other along the second direction, the opposite sides of the gap space along the second direction can be closed to form a second channel 12 running through the first direction. The closing strip 151 on the end plate 15 is arranged opposite to the first main body 13 along the first direction, so as to close the two ends of the first channel 11 along the first direction; the ventilation hole 152 on the end plate 15 is arranged opposite to the gap space along the first direction, so that the second air inlet 121 and the second air outlet 122 can be connected to the outside through the ventilation hole 152.

[0052] Further, such as Figure 8As shown, a positioning structure 1511 is protruded from one side of the closing strip 151 of the end plate 15 toward the first main body 13 , so that the first main body 13 can be installed on the end plate 15 at intervals.

[0053] Furthermore, the end plate 15 can be non-detachably connected to the first main body 13, such as by welding, bonding, etc., which is beneficial to improving the sealing of the main body 10 to reduce the risk of high-temperature gas leakage. The end plate 15 can also be detachably connected to the first main body 13, and a seal 25, such as a sealing ring, is provided between the end plate 15 and the first main body 13 to reduce the risk of high-temperature gas leakage.

[0054] In some embodiments, Figure 2 As shown, the main body 10 further includes a plurality of second main body members 14 . The second main body members 14 extend along the first direction and are disposed between two adjacent first main body members 13 to connect the two adjacent first main body members 13 .

[0055] In a specific embodiment, Figure 2 and Figure 5 As shown, a plurality of first main body members 13 form a plurality of first channels 11, and a gap space is formed between two adjacent first main body members 13. Furthermore, the cross section of the second main body member 14 perpendicular to the first direction is in a square wave shape, and the square wave bends and extends along the second direction. One side of the second main body member 14 perpendicular to the third direction is connected to a first main body member 13, and the other side of the second main body member 14 perpendicular to the third direction is connected to another main body member. The length of the second main body member 14 along the first direction is consistent with the length of the first main body member 13 along the first direction, so as to close both sides of the gap space along the second direction, thereby forming a second channel 12. It is worth mentioning that the second channel 12 includes a plurality of second sub-channels arranged along the second direction.

[0056] In another specific embodiment, a plurality of first main members 13 form a plurality of second channels 12, and a gap space is formed between two adjacent first main members 13. Furthermore, the cross section of the second main member 14 perpendicular to the first direction is in a square wave shape, and the square wave bends and extends along the second direction. One side of the second main member 14 perpendicular to the third direction is connected to a first main member 13, and the other side of the second main member 14 perpendicular to the third direction is connected to another main member, and the side of the second main member 14 perpendicular to the second direction is able to close both sides of the gap space along the second direction, thereby forming a first channel 11. It is worth mentioning that the first channel 11 includes a plurality of first sub-channels arranged along the second direction. It can be understood that the length of the second main member 14 along the first direction is less than the length of the first main member 13 along the first direction, and the second main member 14 is fixed to the middle area of ​​the first main member 13, thereby forming a first air inlet 111 and a first air outlet 112 at both ends along the first direction.

[0057] It is worth mentioning that the cross section of the second main body 14 perpendicular to the first direction can be square wave, sawtooth, or wavy, so as to enhance the structural strength of the main body 10 on the basis of forming the first channel 11 or the second channel 12. The second main body 14 can also be in other shapes, which is not specifically limited in this application.

[0058] In some embodiments, Fig. 9 and Fig.10 As shown, the first main body 13, the second main body 14 and the mounting portion 20 are integrally formed to form a heat exchange core 40, so as to improve the sealing performance of the first channel 11, which is beneficial to reduce the risk of high-temperature gas exposure and reduce the welding process between the first main body 13, the second main body 14 and the mounting portion 20, which is beneficial to improve production efficiency.

[0059] In some embodiments, the heat exchanger 1 further includes a closed chamber fan 31 and a heat dissipation chamber fan 32. The closed chamber fan 31 is arranged at the first air inlet 111 and / or the first air outlet 112 to make the air flow in the first channel 11 flow from the first air inlet 111 to the first air outlet 112; the heat dissipation chamber fan 32 is arranged at the second air inlet 121 and / or the second air outlet 122 to make the air flow in the second channel 12 flow from the second air inlet 121 to the second air outlet 122.

[0060] It can be understood that by setting up the closed chamber fan 31 and the heat dissipation chamber fan 32, it is helpful to adjust the flow direction and flow rate of the high-temperature gas in the first channel 11 and the low-temperature gas in the second channel 12, so that the high-temperature gas and the low-temperature gas can better exchange heat, which is beneficial to improving the efficiency of heat exchange.

[0061] In a specific embodiment, the closed chamber fan 31 is disposed in the communicating chamber 22 of the mounting portion 20 .

[0062] In a specific embodiment, the heat dissipation chamber fan 32 is disposed on an end surface of the main body 10 along the first direction.

[0063] A power converter 2, such as Fig.11 As shown, it includes: a converter body 50 and at least one of the above-mentioned heat exchangers 1 , the converter body 50 has a closed cavity 60 ; the first air inlet 111 and the first air outlet 112 of the heat exchanger 1 are connected to the closed cavity 60 .

[0064] It can be understood that the closed cavity 60 of the converter body 50 is connected to the first channel 11 of the heat exchanger 1 through the first air inlet 111 and the first air outlet 112, so that the high-temperature gas in the closed cavity 60 enters the first channel 11, and then exchanges heat with the low-temperature gas in the second channel 12, so as to reduce the temperature of the high-temperature gas, and thus quickly reduce the temperature inside the closed cavity 60 of the power converter 2.

[0065] In some embodiments, Fig.11 As shown, a closed chamber fan 31 is disposed in the closed chamber 60 , so that the gas in the closed chamber 60 enters the first channel 11 from the first air inlet 111 and flows from the first air inlet 111 to the first air outlet 112 .

[0066] The above describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention to be protected. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A heat exchanger, characterized in that: The heat exchanger has at least one first channel and at least one second channel, and the first channel and the second channel are stacked; the first channel has a first air inlet and a first air outlet, and the first air inlet and the first air outlet are suitable for being respectively connected to the closed cavity of the power converter so that the first channel is connected to the closed cavity; the second channel has a second air inlet and a second air outlet so that the second channel is connected to the outside.

2. A heat exchanger according to claim 1, characterized in that: A plurality of the first channels and a plurality of the second channels extend along a first direction, and the first channels and the second channels are alternately stacked along a third direction; the first air inlet and the first air outlet of each of the first channels are located on a side of the heat exchanger along the second direction, and the first air inlet and the first air outlet are spaced apart along the first direction, so that the first air inlet and the first air outlet are respectively connected to the closed cavity of the power converter; the second air inlet of each of the second channels is located at one end of the heat exchanger along the first direction, and the second air outlet of each of the second channels is located at the other end of the heat exchanger along the first direction, so that the second channel is connected to the outside.

3. A heat exchanger according to claim 2, characterized in that: The first air outlet and the second air inlet are arranged adjacent to each other, and the first air inlet and the second air outlet are arranged adjacent to each other, so that the airflow in the first channel and the airflow in the second channel flow in opposite directions in the first direction.

4. A heat exchanger according to claim 2, characterized in that: It comprises a main body and two mounting parts, the main body having two end faces arranged opposite to each other along a first direction, and a mounting surface along a second direction; the first channel and the second channel are alternately stacked on the main body along a third direction; the first air inlet and the first air outlet are arranged on the mounting surface at intervals along the first direction; the second air inlet is located on one of the end faces, and the second air outlet is located on the other end face; the mounting part is located on the mounting surface, and is used to connect with a power converter, wherein one of the mounting parts is suitable for making each of the first air inlets connected to a closed cavity in a sealed manner, and the other of the mounting parts is suitable for making each of the first air outlets connected to a closed cavity in a sealed manner.

5. A heat exchanger according to claim 4, characterized in that: The main body portion includes two end plates and a plurality of first main body members arranged between the two end plates, the first main body members are arranged at intervals along a third direction, one of the first channel and the second channel is arranged on the first main body member, and the other is arranged between two adjacent first main body members, so that the first channel and the second channel are alternately arranged along the third direction.

6. A heat exchanger according to claim 5, characterized in that: The end plate has a plurality of spaced-apart closing strips, with ventilation holes formed between two adjacent closing strips. The closing strips are suitable for sealing the two ends of the first channel along the first direction, and the ventilation holes enable the two ends of the second channel along the first direction to communicate with the outside world to form the second air inlet and the second air outlet.

7. A heat exchanger according to claim 5, characterized in that: The main body further includes a plurality of second main body members, which extend along the first direction and are arranged between two adjacent first main body members to connect the two adjacent first main body members.

8. A heat exchanger according to claim 7, characterized in that: The first main body, the second main body and the mounting portion are integrally formed.

9. A heat exchanger according to any one of claims 1 to 8, characterized in that: It further includes a closed chamber fan and a heat dissipation chamber fan, wherein the closed chamber fan is arranged at the first air inlet and / or the first air outlet to make the airflow in the first channel flow from the first air inlet to the first air outlet; the heat dissipation chamber fan is arranged at the second air inlet and / or the second air outlet to make the airflow in the second channel flow from the second air inlet to the second air outlet.

10. A power converter, characterized in that: include: a transformer body having a closed cavity; At least one heat exchanger as described in any one of claims 1 to 9, wherein the first air inlet and the first air outlet of the heat exchanger are connected to the closed cavity.

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