Heat exchanger and its manufacturing method, electric control box and air conditioning system

Abstract

A heat exchanger and its manufacturing method, an electric control box and an air conditioning system, the heat exchanger (6) includes at least two plates (631, 632) and a connecting piece (64), the at least two plates (631, 632) are stacked on top of each other, a plurality of microchannels (610, 611) are respectively installed on the at least two plates (631, 632), the connecting piece (64) is sandwiched between the adjacent plates (631, 632), solder is installed on both sides of the connecting piece (64), and the connecting piece (64) is welded and fixed to the plates (631, 632) installed on both sides of the connecting piece (64) by the solder. The welding process of the heat exchanger is simple, the welding reliability is high, and the processing cost can be reduced.

Description

[Technical field]

[0001] This application claims priority from a Chinese patent application entitled "Heat Exchanger and Manufacturing Method Thereof, Electrical Control Box and Air Conditioning System" filed on February 8, 2021 and having application number 202110183051.2, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of air conditioning technology, in particular to a heat exchanger and its manufacturing method, an electric control box and an air conditioning system. [Background technology]

[0003] Heat exchangers are widely used in air conditioning systems and other fields. For example, in air conditioning systems, heat exchangers are usually used as economizers to increase the degree of subcooling at the condenser outlet and improve the cooling or heating capacity of a unit mass of refrigerant. Conventional heat exchangers include plate heat exchangers. Plate heat exchangers are a type of heat exchanger made by pressing thin metal plates into heat exchange plates with a certain corrugated shape, then stacking them and fixing them with clamp plates or bolts. Passages are formed between the heat exchange plates, and the refrigerant flows through the passages and heat exchange is carried out through the heat exchange plates, but the heat exchanger needs to have multiple layers of heat exchange plates stacked, which makes the heat exchanger large in volume. Summary of the Invention [Problem to be solved by the invention]

[0004] The present application provides a heat exchanger and its manufacturing method, an electrical control box and an air conditioning system, which solves the technical problem of the large volume of the traditional plate heat exchanger, and reduces the difficulty and cost of processing the heat exchanger. [Means for solving the problem]

[0005] A first aspect of the present application provides a heat exchanger, comprising at least two plates and a connecting piece, the at least two plates being stacked and arranged, a plurality of microchannels being arranged in each of the at least two plates, the connecting piece being arranged sandwiched between adjacent plates, solder being arranged on both sides of the connecting piece, and the connecting piece being welded and fixed to the plates arranged on both sides of the connecting piece by the solder.

[0006] Here, the connection pieces between adjacent plates are a single-layer structure, or the connection pieces between adjacent plates are at least two-layered, and the at least two-layered connection pieces are further fixed by welding with solder.

[0007] Here, the melting point of the connection piece is higher than the melting point of the solder.

[0008] Here, the connecting piece is a metal foil.

[0009] Here, the thickness of the connection piece is 0.9 mm to 1.2 mm.

[0010] Here, the area of ​​the solder applied to the connection piece that covers the adjacent plates on both sides is 80% or more of the overlapping area of ​​the adjacent plates on both sides.

[0011] Here, the at least two plates include a first plate and a second plate, the first plate having a plurality of first microchannels for a first refrigerant stream to flow therethrough, and the second plate having a plurality of first microchannels for a second refrigerant stream to flow therethrough, and the second refrigerant stream absorbs heat from the first refrigerant stream to subcool the first refrigerant stream, or the first refrigerant stream absorbs heat from the second refrigerant stream to subcool the second refrigerant stream.

[0012] Here, the heat exchanger further includes a collecting pipe, the wall of the collecting pipe is provided with at least two insertion holes, the plate body corresponds to the insertion holes and is welded and fixed to the collecting pipe, and the interval between adjacent insertion holes is 2 mm or more.

[0013] A second aspect of the present application provides a method for manufacturing a heat exchanger, the method for manufacturing a heat exchanger includes the steps of: providing at least two plates; providing a connection piece and installing solder on both sides of the connection piece; stacking and installing the at least two plates and sandwiching the connection piece between adjacent plates; heating the at least two plates and the connection piece to solder the connection piece and the two plates and the connection piece. The plate is welded and fixed. Steps, including.

[0014] A third aspect of the present application provides an electric control box, the electric control box including a box body and a heat exchanger according to any of the above embodiments, the heat exchanger being connected to the electric control box, and the heat exchanger being used to dissipate heat of the electric control box.

[0015] A fourth aspect of the present application provides an air conditioning system, comprising: a compressor, an outdoor heat exchanger, an indoor heat exchanger and a heat exchanger of any of the above embodiments, wherein the compressor provides a circulating refrigerant flow between the outdoor heat exchanger and the indoor heat exchanger through a connecting pipe, and the heat exchanger is disposed between the outdoor heat exchanger and the indoor heat exchanger and communicates with the connecting pipe. Effect of the Invention

[0016] The beneficial effects of the present application are as follows: Different from the state of the art, the present application can effectively reduce the volume of the heat exchanger by stacking and installing at least two plates having microchannels. In addition, the connection piece is sandwiched between the two plates, and the connection piece and the plates are welded and fixed by soldering installed on both sides of the connection piece, so the welding process is simple, the welding reliability is high, and the processing cost can be reduced.

[0017] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. [Brief description of the drawings]

[0018] The drawings herein are incorporated in and constitute a part of the specification, and are used to illustrate the embodiments of the present application and, together with the specification, to explain the technical solutions of the present application. [Figure 1] FIG. 1 is a schematic block diagram of an embodiment of an air conditioning system of the present application. [Diagram 2] FIG. 2 is a schematic block diagram of another embodiment of an air conditioning system of the present application. [Diagram 3] FIG. 2 is a schematic block diagram of another embodiment of an air conditioning system of the present application. [Figure 4] FIG. 2 is a schematic block diagram of another embodiment of an air conditioning system of the present application. [Diagram 5] FIG. 2 is a schematic structural diagram of an embodiment of the heat exchange body of the heat exchanger of the present application; [Figure 6] FIG. 2 is a schematic structural diagram of another embodiment of the heat exchange body of the heat exchanger of the present application; [Figure 7] FIG. 2 is a schematic structural diagram of another embodiment of the heat exchange body of the heat exchanger of the present application; [Figure 8] FIG. 2 is a schematic structural diagram of an embodiment of a heat exchange body and a collecting pipe assembly of the heat exchanger of the present application; [Figure 9] FIG. 2 is a schematic structural diagram of another embodiment of a heat exchange body and a collecting pipe assembly of the heat exchanger of the present application. [Figure 10] FIG. 2 is a schematic structural diagram of another embodiment of a heat exchange body and a collecting pipe assembly of the heat exchanger of the present application. [Figure 11] FIG. 2 is a schematic structural diagram of another embodiment of a heat exchange body and a collecting pipe assembly of the heat exchanger of the present application. [Figure 12] FIG. 2 is a schematic structural diagram of another embodiment of the heat exchange body of the heat exchanger of the present application; [Figure 13] FIG. 2 is a schematic structural diagram of another embodiment of a heat exchange body and a collecting pipe assembly of the heat exchanger of the present application. [Figure 14] FIG. 2 is a schematic structural diagram of another embodiment of a heat exchange body and a collecting pipe assembly of the heat exchanger of the present application. [Figure 15]FIG. 2 is a schematic structural diagram of another embodiment of the heat exchange body of the heat exchanger of the present application; [Figure 16] 16 is a schematic diagram of the three-dimensional structure of the installation plane of the first tubular body of FIG. 15. FIG. [Figure 17] FIG. 2 is a schematic structural diagram of another embodiment of the heat exchange body of the heat exchanger of the present application; [Figure 18] FIG. 2 is a schematic structural diagram of another embodiment of a heat exchange body and a collecting pipe assembly of the heat exchanger of the present application. [Figure 19] FIG. 2 is a schematic structural diagram of another embodiment of the heat exchange body of the heat exchanger of the present application; [Figure 20] 20 is a schematic flow chart of one embodiment of a method for manufacturing the heat exchanger of FIG. 19. [Figure 21] FIG. 2 is a schematic structural diagram of another embodiment of a heat exchange body and a collecting pipe assembly of the heat exchanger of the present application. [Figure 22] FIG. 22 is a schematic structural diagram of an embodiment of the collecting pipe of FIG. 21. [Figure 23] FIG. 2 is a schematic structural diagram of another embodiment of a heat exchanger of the present application; [Figure 24] 24 is an enlarged schematic cross-sectional view of circle B in FIG. 23. [Diagram 25] FIG. 24 is a schematic structural diagram of an embodiment of the heat dissipation fin of FIG. 23. [Figure 26] 24 is a schematic structural diagram of another embodiment of the heat dissipation fin of FIG. 23. FIG. [Figure 27] FIG. 2 is a three-dimensional structural schematic diagram of an embodiment of an electric control box of the present application after hiding some components. [Figure 28] 28 is a schematic diagram of a three-dimensional structure of one embodiment of the heat dissipation fin of FIG. 27. [Figure 29] 28 is a schematic diagram of the three-dimensional structure of another embodiment of the heat dissipation fin of FIG. 27. FIG. [Diagram 30] 1 is a schematic diagram of a three-dimensional structure of a heat dissipation fixed plate and a heat sink according to an embodiment of the present application; [Diagram 31] 31 is a schematic plan view of one embodiment of the heat sink fixed plate of FIG. 30. FIG. [Diagram 32] FIG. 13 is a schematic cross-sectional structural diagram of another embodiment of a heat sink and an electric control box of the present application. [Diagram 33] FIG. 13 is a schematic cross-sectional structural diagram of another embodiment of a heat sink and an electric control box of the present application. [Diagram 34] FIG. 13 is a schematic plan view showing the combination between a heat sink and an electrical control box in another embodiment of the present application. [Diagram 35] FIG. 13 is a schematic cross-sectional structural diagram of another embodiment of the cooperation between the heat sink and the electric control box of the present application. [Diagram 36] FIG. 36 is a schematic structural diagram of an embodiment of the flow guide plate of FIG. 35. [Figure 37] 36 is a schematic structural diagram of another embodiment of the flow guide plate of FIG. 35. FIG. [Figure 38] 36 is a schematic structural diagram of another embodiment of the flow guide plate of FIG. 35. FIG. [Figure 39] FIG. 13 is a schematic plan view showing the cooperation between a heat sink and an electric control box in another embodiment of the present application. [Diagram 40] FIG. 40 is a cross-sectional schematic diagram illustrating the cooperation of the heat sink and the electrical control box of FIG. 39; [Diagram 41] FIG. 13 is a cross-sectional schematic diagram showing the cooperation between a heat sink and an electric control box in another embodiment of the present application. [Diagram 42] FIG. 13 is a schematic diagram of the three-dimensional structure of an electric control box according to another embodiment of the present application after some components are hidden. [Diagram 43] FIG. 13 is a schematic diagram of the three-dimensional structure of an electric control box according to another embodiment of the present application after some components are hidden. [Diagram 44] FIG. 13 is a schematic plan view of an electric control box according to another embodiment of the present application after hiding some components. [Diagram 45] FIG. 45 is a schematic cross-sectional view of the electric control box of FIG. 44. [Figure 46] FIG. 2 is a schematic configuration diagram of another embodiment of an air conditioning system of the present application. [Figure 47] FIG. 47 is a schematic diagram showing the internal structure of the air conditioning system of FIG. 46 after the box body has been removed. [Figure 48] FIG. 47 is a schematic structural diagram of one embodiment of the drain sleeve of FIG. 46. [Figure 49]FIG. 47 is a schematic structural diagram of another embodiment of the drain sleeve of FIG. 46. [Figure 50] FIG. 47 is a schematic cross-sectional view of the air conditioning system of FIG. 46 taken along the line A-A. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, the technical solutions of the embodiments of the present application will be described clearly and completely with reference to the drawings of the embodiments of the present application. It is understood that the described embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments of the present application, all other embodiments that a person skilled in the art can obtain without inventive work are all within the scope of protection of the present application.

[0020] Reference to an "embodiment" in this specification means that a particular feature, structure, or characteristic described in connection with that embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in this specification does not necessarily refer to the same embodiment, nor is it an independent embodiment or an alternative embodiment that is mutually exclusive with other embodiments. A person skilled in the art can explicitly or implicitly understand that the embodiments described in this specification can be combined with other embodiments.

[0021] As shown in Fig. 1, Fig. 1 is a schematic block diagram of an air conditioning system in an embodiment of the present application. As shown in Fig. 1, the air conditioning system 1 mainly includes a compressor 2, a four-way valve 3, an outdoor heat exchanger 4, an indoor heat exchanger 5, a heat exchanger 6, an expansion valve 12 and an expansion valve 13. The expansion valve 13 and the heat exchanger 6 are installed between the outdoor heat exchanger 4 and the indoor heat exchanger 5, and the compressor 2 provides a circulating refrigerant flow between the outdoor heat exchanger 4 and the indoor heat exchanger 5 through the four-way valve 3.

[0022] The heat exchanger 6 includes a first heat exchange channel 610 and a second heat exchange channel 611. A first end of the first heat exchange channel 610 is connected to the outdoor heat exchanger 4 via an expansion valve 13, and a second end of the first heat exchange channel 610 is connected to the indoor heat exchanger 5. A first end of the second heat exchange channel 611 is connected to the second end of the first heat exchange channel 610 via an expansion valve 12, and a second end of the second heat exchange channel 611 is connected to the intake port 22 of the compressor 2.

[0023] When the air conditioning system 1 is in cooling mode, the refrigerant flow path is as follows:

[0024] Exhaust port 21 of compressor 2 - connection port 31 of four-way valve 3 - connection port 32 of four-way valve 3 - outdoor heat exchanger 4 - heat exchanger 6 - indoor heat exchanger 5 - connection port 33 of four-way valve 3 - connection port 34 of four-way valve 3 - intake port 22 of compressor 2.

[0025] The flow path (main channel) of the refrigerant flow in the first heat exchange channel 610 is: a first end of the first heat exchange channel 610-a second end of the first heat exchange channel 610-the indoor heat exchanger 5. The flow path (auxiliary channel) of the refrigerant flow in the second heat exchange passage 611 is: a second end of the first heat exchange channel 610-the expansion valve 12-a first end of the second heat exchange channel 611-a second end of the second heat exchange channel 611-the intake port 22 of the compressor 2.

[0026] For example, the working principle of the air conditioning system at this time is as follows: the outdoor heat exchanger 4, as a condenser, outputs a medium-pressure and medium-temperature refrigerant flow (the temperature may be 40°, liquid phase refrigerant flow) through the expansion valve 13, the refrigerant flow in the first heat exchange channel 610 is a medium-pressure and medium-temperature refrigerant flow, the expansion valve 12 converts the medium-pressure and medium-temperature refrigerant flow into a low-pressure and low-temperature refrigerant flow (the temperature may be 10°, gas-liquid two-phase refrigerant flow), and the refrigerant flow in the second heat exchange channel 611 is a low-pressure and low-temperature refrigerant flow. The low-pressure and low-temperature refrigerant flow in the second heat exchange channel 611 absorbs heat from the medium-pressure and medium-temperature refrigerant flow in the first heat exchange channel 610, and further realizes the vaporization of the refrigerant flow in the second heat exchange channel 611, so that the refrigerant flow in the first heat exchange channel 610 is further subcooled. The vaporized refrigerant flow in the second heat exchange channel 611 increases the enthalpy of the compressor 2 by injecting air, and improves the cooling capacity of the air conditioning system 1.

[0027] Here, the expansion valve 12 serves as a throttle member of the second heat exchange channel 611 to adjust the flow rate of the refrigerant flow in the second heat exchange channel 611. The refrigerant flow in the first heat exchange channel 610 and the refrigerant flow in the second heat exchange channel 611 exchange heat with each other, thereby realizing the subcooling of the refrigerant flow in the first heat exchange channel 610. Therefore, the heat exchanger 6 serves as an economizer of the air conditioning system 1 to improve the degree of subcooling and further improve the heat exchange efficiency of the air conditioning system 1.

[0028] Furthermore, as will be understood by those skilled in the art, in heating mode, the port 31 of the four-way valve 3 is connected to the port 33, and the port 32 of the four-way valve 3 is connected to the port 34. The refrigerant flow output by the compressor 2 through the exhaust port 21 flows from the indoor heat exchanger 5 to the outdoor heat exchanger 4, and the indoor heat exchanger 5 serves as a condenser. At this time, the refrigerant flow output by the indoor heat exchanger 5 is divided into two paths, one path flows into the first heat exchange channel 610 (main channel), and the other path flows into the second heat exchange channel 611 (auxiliary channel) through the expansion valve 12. The refrigerant flow in the second heat exchange channel 611 can also realize the subcooling of the refrigerant flow in the first heat exchange channel 610, thereby improving the heating capacity of the air conditioner.

[0029] 2 and 3, in other embodiments, the first end of the second heat exchange channel 611 may not be connected to the second end of the first heat exchange channel 610, but may be directly connected to the first end of the expansion valve 13 or the second end of the expansion valve 13. In this way, the refrigerant flow in the second heat exchange channel 611 can sub-cool the refrigerant flow in the first heat exchange channel 610, thereby improving the cooling or heating capacity of the air system 1.

[0030] As shown in Figure 4, Figure 4 is a schematic block diagram of an air conditioning system in another embodiment of the present application. The difference between the air conditioning system 1 shown in Figure 4 and the air conditioning system 1 shown in Figure 1 is that a gas-liquid separator 8 is added.

[0031] Similar to the embodiment shown in FIG. 1, the heat exchanger 6 includes a first heat exchange channel 610 and a second heat exchange channel 611, with a first refrigerant stream flowing through the first heat exchange channel 610 and a second refrigerant stream flowing through the second heat exchange channel 611. The second refrigerant stream absorbs heat from the first refrigerant stream as it flows along the second heat exchange channel 611, thereby subcooling the first refrigerant stream. In another embodiment, the first refrigerant stream absorbs heat from the second refrigerant stream as it flows along the first heat exchange channel 610, thereby subcooling the second refrigerant. This allows the heat exchanger 6 to function as an economizer for the air conditioning system 1, improving the degree of subcooling and further improving the heat exchange efficiency of the air conditioning system 1.

[0032] In this embodiment, the inlet of the compressor 2 includes an enthalpy-increasing inlet 221 and a return air inlet 222. Furthermore, the second refrigerant stream flowing through the second heat exchange channel 611 is further supplied to the enthalpy-increasing inlet 221 of the compressor 2 or the inlet 81 of the gas-liquid separator 8, where the outlet 82 of the gas-liquid separator 8 is further connected to the return air inlet 222 of the compressor 2, and is used to supply the low-pressure gas refrigerant stream to the compressor 2.

[0033] In addition, the air conditioning system 1 further includes a four-way valve 3, an expansion valve 12, and an expansion valve 13. The expansion valve 13 and the heat exchanger 6 are installed between the outdoor heat exchanger 4 and the indoor heat exchanger 5. The compressor 2 provides a circulating refrigerant flow between the outdoor heat exchanger 4 and the indoor heat exchanger 5 via the four-way valve 3.

[0034] The four-way valve 3 includes a connection port 31, a connection port 32, a connection port 33, and a connection port 34. The connection port 32 of the four-way valve 3 is connected to the outdoor heat exchanger 4. The connection port 34 of the four-way valve 3 is connected to the gas-liquid separator 8. The connection port 31 of the four-way valve 3 is connected to the compressor 2, specifically, to the exhaust port 21 of the compressor 2. The connection port 33 of the four-way valve 3 is connected to the indoor heat exchanger 5.

[0035] In the above embodiment, the four-way valve in the air conditioning system 1 3 The function of the four-way valve is to change the flow direction of the refrigerant in the system pipeline, thereby realizing the mutual conversion between cooling and heating, so that the air conditioning system 1 can be switched between the cooling mode and the heating mode. When the air conditioning system 1 has both the cooling function and the heating function, 3 The flow direction of the coolant flow can be adjusted using

[0036] In another embodiment, the air conditioning system 1 is a four-way valve 3 It can be understood that the air conditioning system 1 does not need to use a four-way valve. 3 , the compressor 2 can be directly connected to the outdoor heat exchanger 4 through a connecting pipe. Specifically, the compressor 2 provides a circulating refrigerant flow between the outdoor heat exchanger 4 and the indoor heat exchanger 5 through a connecting pipe, and the heat exchanger 6 is installed between the outdoor heat exchanger 4 and the indoor heat exchanger 5 and communicates with the connecting pipe. For example, when the air conditioning system 1 has only a cooling capacity or only a heating capacity, the air conditioning system 1 can be provided with the above-mentioned four-way valve. 3In this way, the configuration of the air conditioning system 1 can be simplified, and the production cost of the air conditioning system 1 can be reduced. Also, when the heat exchanger 6 is not used as an economizer, the heat exchanger 6 can be connected to a connecting pipe at another position.

[0037] A first end of the first heat exchange channel 610 is connected to the outdoor heat exchanger 4 via the expansion valve 13, and a second end of the first heat exchange channel 610 is connected to the indoor heat exchanger 5. A first end of the second heat exchange channel 611 is connected to the second end of the first heat exchange channel 610 via the expansion valve 12, and a second end of the second heat exchange channel 611 is connected to the enthalpy-increasing intake 221 of the compressor 2 or the inlet 81 of the gas-liquid separator 8.

[0038] When the second end of the second heat exchange channel 611 is connected to the enthalpy-increasing inlet 221 of the compressor 2, a medium-pressure gaseous refrigerant can be provided to the jet enthalpy-increasing inlet 221 of the compressor 2, thereby improving the cooling capacity and / or heating capacity of the air conditioning system 1. Here, the principle and function of the jet enthalpy-increasing are within the understanding of those skilled in the art, and will not be described here. When the second end of the second heat exchange channel 611 is connected to the inlet 81 of the gas-liquid separator 8, the evaporation temperature of the refrigerant flow is lower than that at the medium pressure position, and the temperature difference is larger, thereby further improving the heat exchange efficiency of the air conditioning system 1.

[0039] The air conditioning system 1 also includes a switching assembly that is used to selectively connect a second end of the second heat exchange channel 611 to the enthalpy-increasing inlet 221 of the compressor 2 and the inlet 81 of the gas-liquid separator 8. That is, the switching assembly can be used to selectively supply the second refrigerant stream flowing through the second heat exchange channel 611 to the enthalpy-increasing inlet 221 of the compressor 2 and the inlet 81 of the gas-liquid separator 8.

[0040] In one embodiment, the switching assembly may include a solenoid valve 15. The solenoid valve 15 is connected between the enthalpy increase inlet 221 of the compressor 2 and the second end of the second heat exchange channel 611, and when the compressor 2 requires a jet enthalpy increase, the solenoid valve 15 is opened to provide an intermediate pressure gaseous refrigerant flow to the jet enthalpy increase of the compressor 2.

[0041] The switching assembly may further include a solenoid valve 14. The solenoid valve 14 is connected between the second end of the second heat exchange channel 611 and the inlet 81 of the gas-liquid separator 8, and the solenoid valve 14 is used to activate when the compressor 2 does not require or is not suitable for jet enthalpy increase, thereby directing the second refrigerant stream output from the second end of the second heat exchange channel 611 to the gas-liquid separator 8.

[0042] Here, the solenoid valve 15 and the solenoid valve 14 are respectively the second heat exchange channels 611 The expansion valve 12 functions as a throttle member for the second heat exchange channel 611 to adjust the flow rate of the second refrigerant flow in the second heat exchange channel 611.

[0043] The cooling principle and the heating principle of the air conditioning system 1 shown in FIG. 4 are basically the same as those of the air conditioning system 1 shown in FIG. 1, so a description thereof will be omitted here.

[0044] As shown in Fig. 4, the air conditioning system 1 further includes an electric control box 7. The heat exchanger 6 is connected to the electric control box 7, and is installed to dissipate heat from the electronic components in the electric control box 7, for details, please refer to the following description. That is, the heat exchanger 6 serves as an economizer of the air conditioning system 1 to improve the subcooling degree, and also serves as a radiator to dissipate heat to the electric control box 7, specifically to dissipate heat from the electronic components in the electric control box 7.

[0045] Based on the overall structure of the air conditioning system 1 described above, the present application further performs the following optimizations:

[0046] 1. Microchannel heat exchanger

[0047] As shown in Figures 5, 6 and 7, the heat exchanger 6 includes a heat exchange body 61. The heat exchange body 61 is provided with a plurality of micro-channels 612. The plurality of micro-channels 612 include a first micro-channel and a second micro-channel, and in the air conditioning system shown in Figures 1 to 4, the first micro-channel is the first heat exchange channel 610 of the heat exchanger 6, and the second micro-channel is the second heat exchange channel 611 of the heat exchanger 6. Thus, the first micro-channel 610 and the first heat exchange channel 610 use the same reference symbol, and the second micro-channel 611 and the second heat exchange channel 611 use the same reference symbol. The heat exchange body 61 may include a single or multiple plate bodies 613.

[0048] The cross-sectional shape of each microchannel 612 perpendicular to its extending direction may be rectangular. The length of each side of each microchannel 612 is 0.5 mm to 3 mm. The thickness between each microchannel 612 and the surface of the plate body 613 and between the microchannels 612 is 0.2 mm to 0.5 mm, so that the microchannels 612 meet the requirements of pressure resistance and heat transfer performance. In other embodiments, the cross-sectional shape of the microchannels 612 may be other shapes, such as a circle, a triangle, a trapezoid, an ellipse, or an irregular shape.

[0049] The multiple microchannels 612 may be arranged as single-layer microchannels or multi-layer microchannels. When the flow velocity of the refrigerant flow is low and the flow state of the refrigerant flow is laminar, the larger the cross-sectional area of ​​the multiple microchannels 612 is, the shorter the length of the multiple microchannels 612 is, so that the flow resistance loss of the refrigerant flow can be reduced.

[0050] The plurality of microchannels 612 of the plate body 613 may include first microchannels 610 and second microchannels 611 arranged alternately, and the extending direction D1 of the first microchannels 610 is parallel to the extending direction D2 of the second microchannels 611. Specifically, as shown in FIG. 5, in the plurality of microchannels 612, a first preset number of microchannels are divided into the first microchannels 610, and in the plurality of microchannels 612, a second preset number of microchannels are divided into the second microchannels 611. The plurality of first microchannel sets 610 and the plurality of second microchannels 611 are arranged alternately in order, that is, the second microchannel 611 is provided between two sets of the first microchannels 610, and the first microchannel 610 is provided between two sets of the second microchannels 611. This realizes that at least two sets of first microchannels 610 and second microchannels 611 are spaced apart from each other, forming a heat exchanger 6 in which the first microchannels 610 and the second microchannels 611 are alternately arranged. The first and second preset numbers may or may not be the same.

[0051] Furthermore, in the use scenes of FIG. 1 to FIG. 4, the first microchannel 610 and the second microchannel 611 may be independent of each other and may be supplied with different refrigerant flows, so that one of the refrigerant flows can supercool the other refrigerant flow. In another embodiment, the first microchannel 610 and the second microchannel 611 may be connected to each other and function as one microchannel for flowing the same refrigerant flow. Furthermore, when the first microchannel 610 and / or the second microchannel 611 are arranged in two or more layers, the two or multiple layers of the first microchannel 610 and / or the second microchannel 611 may be connected to each other by a collector pipe in the opposite direction, or the two or multiple layers of the first microchannel 610 and / or the second microchannel 611 may be formed by bending the plate body 613 by 180 degrees.

[0052] Optionally, in one embodiment, as shown in FIG. 5, the heat exchange body 61 can include at least one set of first microchannels 610 and at least one set of second microchannels 611. The at least one set of first microchannels 610 and the at least one set of second microchannels 611 are spaced apart from each other along the width direction of the plate body 613. The width direction is perpendicular to the extension direction of the plate body 613.

[0053] 6, the at least one set of first microchannels 610 and the at least one set of second microchannels 611 may also be spaced apart from each other along the thickness direction of the plate 613. The thickness direction of the plate 613 is perpendicular to the extension direction of the plate 613.

[0054] 7, the first micro-channel 610 and the second micro-channel 611 are independent of each other and are installed on different plates 613, so that the extending direction D1 of the first micro-channel 610 and the extending direction D2 of the second micro-channel 611 are arranged perpendicular to each other. This allows the first collecting pipe and the second collecting pipe described below to be installed on different sides of the heat exchanger 6, respectively, thereby facilitating the arrangement of the collecting pipe of the heat exchanger 6. In this embodiment, different refrigerant streams flow through the first micro-channel 610 and the second micro-channel 611, and one of the refrigerant streams can be used to subcool the other refrigerant stream.

[0055] Furthermore, the plate body 613 may be a flat tube, so that the heat dissipation components or electronic components can be installed on the plate body 613. In other embodiments, the plate body 613 may also be a carrier of other cross-sectional shapes, such as a cylinder, a rectangular parallelepiped, a cube, etc. In other embodiments, as described below, the heat exchange body 61 may also include at least two plate bodies 613 arranged stacked on top of each other or two tube bodies nested on each other.

[0056] For example, in the cooling mode of the air conditioning system shown in Figures 1 to 4, a first refrigerant stream (i.e., a medium-pressure and medium-temperature refrigerant stream) flows through the first microchannel 610, and a second refrigerant stream (i.e., a low-pressure and low-temperature refrigerant stream) flows through the second microchannel 611, and the first refrigerant stream may be a liquid-phase refrigerant stream or the second refrigerant stream may be a gas-liquid two-phase refrigerant stream. The second refrigerant stream absorbs heat from the first refrigerant stream in the first microchannel 610 during the process of flowing along the second microchannel 611, and is further vaporized to further subcool the first refrigerant stream.

[0057] It should be noted that the heat exchanger 6 based on the microchannel structure described above and below is not limited to the application scenes shown in Figures 1 to 4, and therefore the terms "first" and "second" in the first microchannel 610 and the second microchannel 611 and the first refrigerant stream and the second refrigerant stream are only used to distinguish different microchannels and refrigerant streams, and should not be limited to the specific application of the microchannel 612 and the refrigerant stream. For example, in other embodiments or operation modes, the first refrigerant stream flowing through the first microchannel 610 absorbs heat from the second refrigerant stream in the second microchannel 611, and the states of the first refrigerant stream and the second refrigerant stream are not limited to the liquid phase or gas-liquid two-phase defined above.

[0058] As shown in Figures 1 to 4, the flow direction A1 of the first refrigerant flow and the flow direction A2 of the second refrigerant flow are opposite to each other. In this way, a large temperature difference between the temperatures of the first refrigerant flow and the second refrigerant flow can always exist within the heat exchange area, thereby improving the heat exchange efficiency of the first refrigerant flow and the second refrigerant flow.

[0059] Alternatively, the flow direction A1 of the first refrigerant flow may be the same as the flow direction A2 of the second refrigerant flow, or may be perpendicular to each other. When the flow directions of the refrigerant flows are the same, the temperature of the heat exchanger 6 closer to the inlet is lower, which can further improve the heat exchange effect of the region, for example, the region is connected to an electrically controlled region with high heat generation to improve the heat dissipation effect. When the flow directions of the refrigerant flows are perpendicular to each other, the first and second collecting pipes are respectively installed on different sides of the heat exchanger 6, which can facilitate the arrangement of the refrigerant collecting pipes of the heat exchangers.

[0060] 1.1 Collector Assembly

[0061] 8, the heat exchanger 6 further includes a collecting pipe assembly 62. The extension direction of the collecting pipe assembly 62 is perpendicular to the extension direction of the heat exchange body 61. For example, when the heat exchange body 61 is installed along a horizontal plane, the collecting pipe assembly 62 is vertically installed along the direction of gravity; thus, when the collecting pipe assembly 62 is connected to a compressor installed below the heat exchanger 6, the piping arrangement of the collecting pipe assembly 62 can be facilitated.

[0062] When the heat exchange body 61 is installed vertically along the gravity direction, the collecting pipe assembly 62 is installed along a horizontal plane, thus improving the uniformity of the refrigerant distribution in the collecting pipe assembly 62, so that the distribution of the refrigerant in the heat exchange body 61 is uniform.

[0063] 8, the collecting pipe assembly 62 includes a first collecting pipe 621 and a second collecting pipe 622. A first collecting passage is provided in the first collecting pipe 621, and a second collecting passage is provided in the second collecting pipe 622. Here, the cross-sectional shape of the heat exchanger 6 in the flow direction of the refrigerant flow (first refrigerant flow or second refrigerant flow) in the heat exchange body 61 is I-shaped. In other embodiments, the cross-sectional shape of the heat exchanger 6 in the flow direction of the refrigerant flow in the heat exchange body 61 may be L-shaped, U-shaped, G-shaped, circular, etc.

[0064] The first collecting passage is connected to the first microchannel 610, thereby supplying a first refrigerant flow to the first microchannel 610 via the first collecting passage and / or collecting the first refrigerant flow flowing through the first microchannel 610.

[0065] For example, in the air conditioning system shown in Figures 1-4, a first end of the first micro-channel 610 is connected to the outdoor heat exchanger 4 via one of the two first collecting pipes 621 and the expansion valve 13, so as to supply a first refrigerant flow to the first micro-channel 610 in the cooling mode. A second end of the first micro-channel 610 is connected to the indoor heat exchanger 5 via the other of the two first collecting pipes 621 to collect the first refrigerant flow flowing through the first micro-channel 610. In the heating mode, the flow direction of the first refrigerant flow in the first micro-channel 610 is reversed, so that the functions of the two first collecting pipes 621 are exchanged compared with the functions of the two first collecting pipes 621 in the cooling mode.

[0066] The second collecting passage is connected to the second microchannel 611, thereby supplying the second refrigerant stream to the second microchannel 611 through the second collecting passage and / or collecting the second refrigerant stream that has flowed through the second microchannel 611. For example, in the air conditioning system shown in FIGS. 1-4, a first end of the second microchannel 611 is connected to one of the two second collecting pipes 622 and the second expansion valve 12, thereby supplying the second refrigerant stream to the second microchannel 611. A second end of the second microchannel 611 is connected to the enthalpy increasing intake 221 of the compressor 2 or the inlet 81 of the gas-liquid separator 8 through the other of the two second collecting pipes 622 to collect the second refrigerant stream that has flowed through the second microchannel 611.

[0067] When the first microchannel 610 and / or the second microchannel 611 are connected through a 180° bend or a reverse collecting pipe to form a two-layer first microchannel 610 or second microchannel 611, the inlet and outlet of the first microchannel 610 and / or the second microchannel 611 may be arranged on the same side of the heat exchange body 61. In this case, the first collecting passage and the second collecting passage may be divided into a refrigerant supply region and a refrigerant collecting region, and the inlet and outlet of the first microchannel and / or the second microchannel are respectively connected to the refrigerant supply region and the collecting refrigerant region supplied from the collecting pipe assembly 62.

[0068] In one embodiment, the heat exchange body 61 includes at least two sets of first micro-channels 610 and at least two sets of second micro-channels 611, where the same ends of the at least two sets of first micro-channels 610 are connected to the same first collecting pipe 621, and the same ends of the at least two sets of second micro-channels 611 are connected to the same second collecting pipe 622. That is, one collecting pipe can correspond to multiple sets of micro-channels, which avoids installing collecting pipes corresponding to each micro-channel, and reduces costs.

[0069] 8, the extension direction D1 of the first micro-channel 610 and the extension direction D2 of the second micro-channel 611 are parallel, and therefore the extension directions of the first collecting pipe 621 and the second collecting pipe 622 are parallel to each other. However, in other embodiments, the extension directions of the first collecting pipe 621 and the second collecting pipe 622 can be adjusted according to the extension directions of the first micro-channel 610 and the second micro-channel 611, and can be arranged, for example, perpendicular to each other.

[0070] 1.2 The first and second collecting pipes are installed with a gap between them.

[0071] As shown in FIG. 8 , the first collecting pipe 621 and the second collecting pipe 622 are installed at a distance from each other, and the second collecting pipe 622 is installed farther from the heat exchange body 61 than the first collecting pipe 621, and the first collecting pipe 621 is installed between the second collecting pipe 622 and the heat exchange body 61.

[0072] In one embodiment, as shown in Fig. 9, the second micro-channel 611 is inserted into the second collecting pipe 622 through the first collecting pipe 621 and fixed by welding. The first micro-channel 610 is inserted into the first collecting pipe 621 and fixed by welding. In another embodiment, as shown in Fig. 10, the first collecting pipe 621 is disposed farther from the heat exchange body 61 than the second collecting pipe 622, and the second collecting pipe 622 is disposed between the first collecting pipe 621 and the heat exchange body 61. The first micro-channel 610 is inserted into the first collecting pipe 621 through the second collecting pipe 622 and fixed by welding.

[0073] As described herein and in the present specification, a microchannel passing through a collecting pipe means that the microchannel passes through the collecting pipe and is not in communication with the collecting pipe, and a microchannel inserted into a collecting pipe means that the microchannel is in communication with the collecting pipe. For example, a second microchannel 611 passing through a first collecting pipe 621 means that the second microchannel 611 passes through the first collecting pipe 621 and is not in communication with a second collecting pipe 622. A second microchannel 611 inserted into a second collecting pipe 622 means that the second microchannel 611 is in communication with the second collecting pipe 622.

[0074] Each of the first microchannels 610 and the second microchannels 611 may be provided in one or more sets. For example, as shown in Fig. 9, the first microchannels 610 may be provided in two sets, and the second microchannels 611 may be provided in one set, with the second microchannels 611 being located between the two sets of the first microchannels 610. In other embodiments, both the first microchannels 610 and the second microchannels 611 may be arranged in two or more sets, and the first microchannels 610 and the second microchannels 611 may be arranged in two or more sets. 611 are arranged in an alternating stack to form an arrangement such as the first microchannel 610-the second microchannel 611-the first microchannel 610-the second microchannel 611 or the first microchannel 610-the second microchannel 611-the second microchannel 611-the first microchannel 610, etc.

[0075] In another embodiment, as shown in Fig. 9, one of the first micro-channel 610 and the second micro-channel 611 can be the main channel, and the other of the first micro-channel 610 and the second micro-channel 611 can function as the auxiliary channel, and the refrigerant flow in the auxiliary channel can be used to subcool the refrigerant flow in the main channel. At this time, the flow rate of the refrigerant flow in the main channel is large, so that the flow rate of the refrigerant flow in the auxiliary channel is small, and the main channel can be installed outside the heat exchange body 61, which is connected to the electric control box. 7 Easy to connect to the electrical control box 7 In addition, in this embodiment, the method of passing the main channel with a large refrigerant flow rate through the collecting pipe corresponding to the auxiliary channel and inserting it into the collecting pipe corresponding to the main channel does not occupy space in the collecting pipe corresponding to the main channel, compared with the case where the auxiliary channel passes through the collecting pipe corresponding to the main channel, and can reduce the flow path pressure loss of the collecting pipe corresponding to the main channel and make the flow division more uniform.

[0076] 10 , when the first micro-channel 610 is a main channel with a large refrigerant flow rate and the second micro-channel 611 is an auxiliary channel with a small refrigerant flow rate, the first micro-channel 610 penetrates the second collecting pipe 622 and is inserted into the first collecting pipe 621. In this manner, the second micro-channel 611 does not occupy the space of the first collecting pipe 621, and compared with the manner in which the second micro-channel 611 penetrates the first collecting pipe 621, the flow path pressure loss of the first collecting pipe 621 can be reduced and the flow division can be made more uniform.

[0077] In another embodiment, the first collecting pipe 621 and the second collecting pipe 622 may be welded, which can reduce the distance between the first collecting pipe 621 and the second collecting pipe 622. In other embodiments, the first collecting pipe 621 and the second collecting pipe 622 may be glued or snapped together.

[0078] Also, the first micro-channel 610 can be connected to the first collecting pipe 621 after bypassing the second collecting pipe 622. For example, the first micro-channel 610 is disposed outside the second collecting pipe 622, thereby bypassing the second collecting pipe 622 before being connected to the first collecting pipe 621. Alternatively, the second micro-channel 611 may be connected to the second collecting pipe 622 after bypassing the first collecting pipe 621.

[0079] In other embodiments, the microchannels in the heat exchange body 61 may be arranged in other ways. At least some of the microchannels in the microchannels penetrate one of at least two collecting pipes and are inserted into the other collecting pipe. This can reduce the volume of the heat exchanger 6. When specifically set, the microchannels with a large refrigerant flow rate can penetrate one of at least two collecting pipes and be inserted into the other collecting pipe, so that the pressure loss of the collecting pipe can be reduced and the microchannels can be divided more uniformly.

[0080] As can be understood, the heat exchange body 61 may be one plate body 613 or may be composed of multiple plates 613. Accordingly, the first micro-channel 610 and the second micro-channel 611 may be disposed on the same plate body 613 or on different plates 613. For example, when the first micro-channel 610 and the second micro-channel 611 are disposed on the same plate body 613, one end of some micro-channels penetrates one of the at least two collecting pipes and is inserted into another collecting pipe. The other end of at least some micro-channels is inserted into the collecting pipe through which it penetrates, and arranged in this manner, the integration degree of the heat exchange body 61 can be improved, processes such as welding can be omitted, and the heat exchange effect can be improved.

[0081] The at least two collecting pipes are not limited to the above-mentioned configuration in which they are spaced apart from each other, but may be at least two collecting pipes consisting of a general common collecting pipe and a baffle plate as described below.

[0082] 1.3 The common collecting duct is divided into two collecting ducts

[0083] 11, the collecting pipe assembly 62 includes a common collecting pipe 623 and a baffle plate 624. The baffle plate 624 is disposed in the common collecting pipe 623, and the common collecting pipe 623 is separated by the baffle plate 624 to form a first collecting pipe 621 and a second collecting pipe 622. In other embodiments, the number of the baffle plate 624 and the formed collecting pipes can be set as required.

[0084] 11 , the first micro-channel 610 penetrates the pipe wall of the common collector pipe 623 and is inserted into the first collector pipe 621, and the second micro-channel 611 penetrates the pipe wall of the common collector pipe 623 and the baffle plate 624 (i.e., penetrates the first collector pipe 621) and is inserted into the second collector pipe 622. In another embodiment, the second micro-channel 611 penetrates the pipe wall of the common collector pipe 623 and is inserted into the second collector pipe 622, and the first micro-channel 610 penetrates the pipe wall of the common collector pipe 623 and the baffle plate 624 and is inserted into the first collector pipe 621.

[0085] 9 or 10, the following is noted. In this embodiment, a single common collecting pipe 623 simultaneously realizes the functions of the first collecting pipe 621 and the second collecting pipe 622, thereby reducing the cost and volume of the collecting pipe assembly 62.

[0086] In another embodiment, the common collecting pipe 623 can be divided into two first collecting pipes 621 or two second collecting pipes 622 using the baffle plate 624. For example, when the first micro-channel 610 or the second micro-channel 611 is bent 180° or has a collecting pipe in the opposite direction to form a two-layered first micro-channel 610 or a two-layered second micro-channel 611, one end of the first micro-channel 610 penetrates the wall of the common collecting pipe 623 and is inserted into one of the first collecting pipes 621 therein, and the other end of the first micro-channel 610 penetrates the wall of the common collecting pipe 623 and the baffle plate 624 to be inserted into the other of the first collecting pipes 621 therein. Alternatively, one end of the second microchannel 611 penetrates the wall of the common collector duct 623 and is inserted into one side of the second collector duct 622 therein, and the other end of the second microchannel 611 penetrates the wall of the common collector duct 623 and the baffle plate 624 and is inserted into the other side of the second collector duct 622 therein.

[0087] In another embodiment, as shown in Figures 12 and 13, a slot 601 is provided on the end surface of the heat exchange body 61. The slot 601 is located between the first micro-channel 610 and the second micro-channel 611, and the baffle plate 624 is fitted into the slot 601, so that the first micro-channel 610 penetrates the wall of the common collector pipe 623 and is inserted into the first collector pipe 621, and the second micro-channel 611 penetrates the wall of the common collector pipe 623 and is inserted into the second collector pipe 622. The manner of providing the slot 601 can shorten the overall length of the heat exchanger 6, reduce the material cost of the heat exchanger 6, and simplify the welding process between the collector pipe assembly 62 and the heat exchange body 61.

[0088] In one embodiment, when the first micro-channel 610 or the second micro-channel 611 forms two layers of the first micro-channel 610 or the second micro-channel 611 after bending 180° or reversing the collecting pipe, the inlet end and the outlet end of the heat exchange body 61 are located on the same side. At this time, one end of the first micro-channel 610 penetrates the pipe wall of the common collecting pipe 623 and is inserted into one side of the first collecting pipe 621 therein, and the other end of the first micro-channel 610 penetrates the pipe wall of the common collecting pipe 623 and is inserted into the other side of the first collecting pipe 621 therein.

[0089] Alternatively, one end of the second microchannel 611 penetrates the wall of the common collector 623 and is inserted into one side of the second collector 622 therein, and the other end of the second microchannel 611 penetrates the wall of the common collector 623 and is inserted into the other side of the second collector 622 therein.

[0090] Furthermore, the heat exchange body 61 may be a single plate 613 or a plurality of plates 613. In the embodiment shown in FIG. 12, the heat exchange body 61 may be a single plate 613, and the first microchannel 610 and the second microchannel 611 may be disposed in the single plate 613. Furthermore, an interval region is provided between the first microchannel 610 and the second microchannel 611 on the end surface of the single plate 613, and a slot 601 is provided in the interval region. In this way, the heat exchange body 61 is integrally disposed, the structure is simple, the reliability is high, and the heat transfer efficiency of the heat exchange body 61 can be improved. In another embodiment, the heat exchange body 61 may include at least two plates 613, as described below. At least two plates 613 are arranged in a stacked manner. A slot 601 is provided on the end surface of the at least two plates 613, and the slot 601 is disposed between the adjacent plates 613, and the baffle plate 624 is fitted into the slot 601.

[0091] It should be noted that the above-mentioned baffle plate 624 and slot 601 can also be adapted to other microchannel grouping methods, as long as at least two sets of microchannels can be installed in the heat exchange body 61. The at least two sets of microchannels can be connected to each other and used for the flow of the same refrigerant flow, or the at least two sets of microchannels can be independent from each other and used for the flow of different refrigerant flows.

[0092] 1.4 The first and second collecting pipes are installed in a nested configuration.

[0093] 14, the diameter of the second collecting pipe 622 is smaller than the diameter of the first collecting pipe 621. The first collecting pipe 621 is fitted on the outside of the second collecting pipe 622, and the first micro-channel 610 penetrates the pipe wall of the first collecting pipe 621 and is inserted into the first collecting pipe 621. The second micro-channel 611 penetrates the pipe walls of the first collecting pipe 621 and the second collecting pipe 622 and is inserted into the second collecting pipe 622. In another embodiment, the second collecting pipe 622 may be fitted on the outside of the first collecting pipe 621. In this case, the second micro-channel 611 penetrates the pipe wall of the second collecting pipe 622 and is inserted into the second collecting pipe 622. The first micro-channel 610 penetrates the pipe walls of the second collecting pipe 622 and the first collecting pipe 621 and is inserted into the first collecting pipe 621.

[0094] Compared to the collecting pipe assembly 62 shown in FIG. 9 or FIG. 10, the volume of the collecting pipe assembly 62 can be reduced by being arranged in a nested manner.

[0095] In other embodiments, two first collecting pipes 621 may be nested within each other, or two second collecting pipes 622 may be nested within each other. In this case, one end of the first micro-channel 610 penetrates the wall of the outer first collecting pipe 621 and is inserted into the outer first collecting pipe 621. The other end of the first micro-channel 610 penetrates the walls of the two first collecting pipes 621 and is inserted into the inner first collecting pipe 621.

[0096] Alternatively, one end of the second micro-channel 611 penetrates the wall of the outer second collecting pipe 622 and is inserted into the two outer collecting pipes 622. The other end of the second micro-channel 611 penetrates the walls of the two second collecting pipes 622 and is inserted into the inner second collecting pipe 622.

[0097] 2. Sleeve type heat exchanger

[0098] 15, the heat exchanger 6 includes a heat exchange body 61. The heat exchange body 61 includes a first tube 614 and a second tube 615 nested together, that is, the heat exchanger 6 is a sleeve-type heat exchanger. A plurality of first micro-channels 610 are provided in the first tube 614, and a plurality of second micro-channels 611 are provided in the second tube 615, both of which are the same as the micro-channels 612 shown in FIG. 5, thereby shortening the length of the heat exchange body 61 and further reducing the volume of the heat exchanger 6.

[0099] Here, the extension direction of the first micro-channel 610 and the extension direction of the second micro-channel 611 are parallel to each other, for example, the extension direction of the first micro-channel 610 is the same as the extension direction of the second micro-channel 611 .

[0100] 16, in this embodiment, the first tube 614 is fitted to the outside of the second tube 615, and at least one flat surface 616 is provided on the outer surface of the first tube 614, thereby forming a heat exchange contact surface of the first tube 614. Heat dissipation components or electronic components can be disposed on the flat surface 616 for easy mounting. In other embodiments, the second tube 615 may be fitted to the outside of the first tube 614, and a similar flat surface may be formed.

[0101] In the air conditioning system 1 shown in Figures 1 to 4, the first refrigerant stream flows through the first microchannels 610, and the second refrigerant stream flows through the second microchannels 611, and the first refrigerant stream may be a liquid phase refrigerant stream, and the second refrigerant stream may be a gas-liquid two-phase refrigerant stream. The second refrigerant stream absorbs heat from the first refrigerant stream of the first microchannels 610 in the process of flowing along the second microchannels 611, and is further vaporized, thereby further subcooling the first refrigerant stream. In other embodiments or operation modes, the first refrigerant stream flowing through the first microchannels 610 can absorb heat from the second refrigerant stream of the second microchannels 611, and the states of the first refrigerant stream and the second refrigerant stream are also not limited to the liquid phase or gas-liquid two-phase defined above.

[0102] 5, the cross-sectional area of ​​the heat exchange body 61 is increased, which can reduce the pressure loss of the refrigerant flow. In addition, the first tube 614 and the second tube 615 are installed in a sleeve style, which can increase the heat exchange area between the first micro-channels 610 and the second micro-channels 611, and improve the heat exchange efficiency between the first micro-channels 610 and the second micro-channels 611.

[0103] Similar to FIG. 8, the heat exchanger 6 further includes a collecting pipe assembly 62. The collecting pipe assembly 62 includes a first collecting pipe 621 and a second collecting pipe 622. A first collecting passage is provided in the first collecting pipe 621, and the first collecting passage is used to provide a first refrigerant flow to the first microchannel 610 and / or collect the first refrigerant flow flowing through the first microchannel 610. A second collecting passage is provided in the second collecting pipe 622, and the second collecting passage is used to provide a second refrigerant flow to the second microchannel 611 and / or collect the second refrigerant flow flowing through the microchannel 611. Here, the cross-sectional shape of the heat exchanger 6 in the flow direction of the refrigerant flow in the heat exchange body 61 is I-shaped. In other embodiments, the cross-sectional shape of the heat exchanger 6 in the flow direction of the refrigerant flow in the heat exchange body 61 may be L-shaped, U-shaped, G-shaped, circular, etc.

[0104] The collecting pipe assembly 62 may use various collecting pipe arrangement methods as described above, such as an arrangement in which the first collecting pipe 621 and the second collecting pipe 622 are arranged at a distance from each other, an arrangement in which the general collecting pipe 623 and the baffle plate 624 are arranged, or an arrangement in which the first collecting pipe 621 and the second collecting pipe 622 are nested together. In this case, the first pipe 614 and the first microchannel 610 thereon, and the second pipe 615 and the second microchannel 611 thereon may be combined with the collecting pipe in the above-mentioned manner, and the description thereof will be omitted here.

[0105] 3. The heat exchanger has a plurality of plates arranged in a stack on top of each other.

[0106] 17, the heat exchanger 6 includes a heat exchange body 61. The heat exchange body 61 includes a first plate body 631 and a second plate body 632, and the first plate body 631 and the second plate body 632 are stacked on each other.

[0107] A plurality of first micro-channels 610 are provided in the first plate 631, and a plurality of second micro-channels 611 are provided in the second plate 632. The plurality of first micro-channels 610 and the plurality of second micro-channels 611 are both the same as the micro-channels 612 shown in Figures 5 to 7, and therefore a description thereof will be omitted here. By adopting the multi-layer structure, the length of the heat exchange body 61 is shortened, and the volume of the heat exchanger 6 is further reduced.

[0108] Since the first plate 631 and the second plate 632 are stacked and arranged on top of each other, the contact area between the first plate 631 and the second plate 632 is increased, thereby increasing the heat exchange area between the first microchannel 610 and the second microchannel 611, and improving the heat exchange efficiency.

[0109] In the air conditioning system shown in Figures 1 to 4, a first refrigerant stream flows through a plurality of first micro-channels 610, and a second refrigerant stream flows through a plurality of second micro-channels 611, and in the process of flowing along the plurality of second micro-channels 611, the second refrigerant stream absorbs heat from the first refrigerant stream in the plurality of first micro-channels 610 and is further gasified, further subcooling the first refrigerant stream.

[0110] In other embodiments or modes of operation, the first refrigerant stream flowing through the first microchannel 610 can absorb heat from the second refrigerant stream in the second microchannel 611. The states of the first and second refrigerant streams are also not limited to liquid or two-phase as defined above.

[0111] The first plate 631 and the second plate 632 may each be provided in one or more numbers. For example, the number of the first plate 631 may be two, and the second plate 632 is sandwiched between the two first plates 631, for example, the first plate 631, the second plate 632 and the first plate 631 are stacked in order. By sandwiching the second plate 632 between the two first plates 631, the second refrigerant flow of the second plate 632 simultaneously absorbs heat from the first refrigerant flow of the two first plates 631, thereby realizing that the first refrigerant flow of the two first plates 631 is supercooled. In addition, the heat dissipation component or electronic component may be thermally connected to the first plate 631, for example, installed on the surface of the first plate 631 away from the second plate 632, which can facilitate installation. In another embodiment, the number of the first plate 631 and the number of the second plate 632 may be two or more, and the first plate 631 and the second plate 632 are alternately stacked.

[0112] In one embodiment, the two first plates 631 may be two plates independent of each other. In another embodiment, the two first plates 631 may be connected together in a U-shape or connected by a collecting pipe in the opposite direction, in which case the first microchannels 610 in the two first plates 631 are communicated in a U-shape, so that the inlet and the outlet of the first microchannel 610 are located on the same side of the heat exchange body 61.

[0113] In another embodiment, the number of the second plates 632 may be two, and the first plate 631 is sandwiched between the two second plates 632. In this case, the heat dissipation components or electronic components may be installed to be thermally connected to the second plates 632.

[0114] 18, the heat exchanger 6 further includes a collecting pipe assembly 62. The collecting pipe assembly 62 includes a first collecting pipe 621 and a second collecting pipe 622. The first collecting pipe 621 is provided with a first collecting passage, which is used for supplying a first refrigerant stream to the first microchannel 610 and / or collecting the first refrigerant stream flowing through the first microchannel 610. The second collecting pipe 622 is provided with a second collecting passage, which is used for supplying a second refrigerant stream to the second microchannel 611 and / or collecting the second refrigerant stream flowing through the second microchannel 611.

[0115] The collecting pipe assembly 62 may adopt various collecting pipe arrangement methods as described above, such as an arrangement in which the first collecting pipe 621 and the second collecting pipe 622 are spaced apart from each other, an arrangement in which the general collecting pipe 623 and the baffle plate 624 are arranged, or an arrangement in which the first collecting pipe 621 and the second collecting pipe 622 are nested together. In this case, the first plate 631 and the first microchannel 610 thereon, and the second plate 633 and the second microchannel 611 thereon may be combined with the collecting pipe in the above-mentioned manner.

[0116] 3.1 Welding process between stacked and installed plates

[0117] 19, in this embodiment, the heat exchanger 6 includes a first plate 631, a second plate 632, and a connection piece 64. The first plate 631 and the second plate 632 are stacked on top of each other, and the connection piece 64 is sandwiched between the adjacent first plate 631 and second plate 632. Solder (not shown) is provided on both sides of the connection piece 64, and the solder is used to weld and fix the connection piece 64 to the first plate 631 and the second plate 632 on both sides of the connection piece 64.

[0118] In this embodiment, solder is provided on both sides of the connection piece 64, and the first plate 631 and the second plate 632 are welded via the connection piece 64. In this manner, effective fixation can be obtained between the first plate 631 and the second plate 632. When welding adjacent plates 613, it is necessary to apply solder to the bonding surfaces of the two plates 613. By disposing the soldered connection piece 64 between the two plates 613, production costs can be significantly reduced compared to plates 613 whose surfaces are coated with solder.

[0119] In addition, the melting point of the connection piece 64 is higher than that of the solder. In order to improve the thermal conductivity, the connection piece 64 may be a metal foil. For example, the connection piece 64 may be an aluminum foil or a copper foil, etc. The cost of the metal foil is low, and the process of installing the solder on both sides of the metal foil is also simple, so that the metal foil with solder is easy to obtain and has a low production cost.

[0120] The area of ​​the solder provided on the connection piece 64 covering the first plate 631 and the second plate 632 adjacent thereto on both sides is 80% or more of the overlapping area between the first plate 631 and the second plate 632, thereby improving the reliability of the welding between the first plate 631 and the second plate 632. Alternatively, the area of ​​the solder provided on the connection piece 64 covering the first plate 631 and the second plate 632 adjacent thereto on both sides may be 80% of the overlapping area between the first plate 631 and the second plate 632. Alternatively, the area of ​​the solder provided on the connection piece 64 covering the first plate 631 and the second plate 632 adjacent thereto on both sides may be equal to the overlapping area between the first plate 631 and the second plate 632, thereby further improving the reliability of the heat exchanger 6.

[0121] Alternatively, the connection piece 64 between the first plate 631 and the second plate 632 may be a single-layer structure, i.e., only one layer of the connection piece 64 is installed between the first plate 631 and the second plate 632. In another embodiment, the connection piece 64 between the first plate 631 and the second plate 632 is at least two layers, for example, the connection piece 64 may be a two-layer, three-layer or four-layer structure, etc. In this case, the at least two layers of the connection piece 64 are further fixed by welding with solder. By flexibly selecting the number of layers of the connection piece 64, the distance between the first plate 631 and the second plate 632 can be adjusted, so that the heat exchanger 6 can be adapted to different application scenes. For example, in order to be compatible with the above-mentioned baffle plate, a slot having a width equal to the thickness of at least two stacked connection pieces 64 is formed between the first plate 631 and the second plate 632.

[0122] The thickness of the connection piece 64 is 0.9 mm to 1.2 mm. For example, the thickness of the connection piece 64 may be 0.9 mm, 1 mm, or 1.2 mm.

[0123] It should be noted that the connecting piece 64 can be arranged between at least two other plates with microchannels, for example the two first plates 631 or the two second plates 632 .

[0124] In a specific embodiment, as shown in Fig. 20, the manufacturing method of the heat exchanger 6 includes the following steps: Step S11: provide at least two plates; Step S12: provide a connection piece, and install solder on both sides of the connection piece; Step S13: stack and install the at least two plates, and sandwich and install the connection piece between the adjacent plates; Step S14: heat the at least two plates and the connection piece, and solder the connection piece and the two sides of the connection piece. Plate Weld and secure.

[0125] 3.2 Connection between stacked plates and collecting pipe

[0126] 21 , the heat exchanger 6 includes at least two plate bodies 613 and at least one collecting pipe 620. The plate body 613 includes a main body portion 671 and a connecting portion 672. The main body portions 671 of the at least two plate bodies 613 are stacked on top of each other. One end of the connecting portion 672 is connected to the main body portion 671, and the other end of the connecting portion 672 is connected to the collecting pipe 620.

[0127] 22, at least two insertion holes 602 are provided in the pipe wall of the collecting pipe 620, and the other end of the connection part 672 of the plate body 613 corresponds to the insertion holes 602 and is welded and fixed to the collecting pipe 620. That is, the connection part 672 is located at the end of the plate body 613 and is used to be fixed to the collecting pipe 620. When the at least two plate bodies 613 are welded to the collecting pipe 620, if the gap between the two adjacent plate bodies 613 at the welding point is small, the welding difficulty increases, and the solder flows along the gap between the two adjacent plate bodies 613, causing poor welding between the plate body 613 and the collecting pipe 620, and causing the risk of refrigerant leakage.

[0128] In this embodiment, there is a first distance d1 between two adjacent insertion holes 602 of the collecting pipe 620, and there is a second distance d2 between the main bodies 671 of two adjacent plate bodies 613, where the first distance d1 is greater than the second distance d2. In this way, the distance between the connection parts 672 of the two adjacent plate bodies 613 at the welding point can be increased, reducing the capillary action between the two adjacent plate bodies 613 and improving the reliability of the welding between the plate body 613 and the collecting pipe 620.

[0129] Furthermore, the first distance d1 is 2 mm or more, for example, the first distance d1 may be 2 mm or 3 mm, etc., which reduces the capillary action between the connection parts 672 of the plate bodies 613 and is advantageous for welding between the connection parts 672 of the plate bodies 613 and the collecting pipe 620. Furthermore, the first distance d1 is further 6 mm or less, which allows the heat exchanger 6 to have high structural strength and improves the reliability of the heat exchanger 6.

[0130] Optionally, the connection parts 672 of at least some of the plates 613 are curved, for example, the connection parts 672 of at least some of the plates 613 are arc-shaped. Such a curved arrangement makes it easy to adjust the distance between the connection parts 672 of two adjacent plates 613, which is advantageous for welding and fixing between the plates 613 and the collecting pipe 620, and can reduce the capillary action between the two adjacent plates 613 during welding.

[0131] Optionally, one end of the connecting portion 672 of the plate 613 can be curved and the other end can be straight, which simplifies the manufacturing process.

[0132] Furthermore, there is a third distance d3 between the connecting portions 672 of at least partially adjacent plate bodies 613, and the third distance d3 gradually increases within at least a portion of the range from the main body portion 671 to the collecting pipe 620, gradually increasing the distance between adjacent connecting portions 672 and reducing the capillary action between two adjacent plate bodies 613.

[0133] In the embodiment shown in FIG. 21, the at least two plates 61 may include the first plate 631 and the second plate 632 described above.

[0134] Further, in this embodiment, the number of the first plates 631 is two, the number of the second plates 632 is two, and the first plates 631 and the second plates 632 are sequentially stacked. Among them, one second plate 632 is sandwiched between two first plates 631, and another second plate 632 is stacked on the outside of one of the first plates 631 away from the sandwiched second plates 632. The collecting pipe 620 includes a first collecting pipe 621 and a second collecting pipe 622 spaced apart from each other. A plurality of first microchannels for the first refrigerant flow are provided on the first plate 631, and a plurality of second microchannels for the second refrigerant flow are provided on the second plate 632. The second refrigerant stream absorbs heat from the first refrigerant stream while flowing along the plurality of second micro-channels 611, so that the first refrigerant stream is subcooled, or the first refrigerant stream absorbs heat from the second refrigerant stream while flowing along the plurality of first micro-channels 610, so that the second refrigerant stream is subcooled. The connection portion 672 of the first plate body 631 is welded and fixed to the first collecting pipe 621, and the connection portion 672 of the second plate body 632 is welded and fixed to the second collecting pipe 621. 622 The plate is welded to the plate.

[0135] 21, the connection part 672 of the clamped second plate 632 can penetrate the first collecting pipe 621 and be connected to the second collecting pipe 622, and the connection part 672 of the second plate 632 located on the outside can be welded and fixed, bypassing the first collecting pipe 621 and the second collecting pipe 622, thus reducing the number of insertion holes 602 in the first collecting pipe 621 and increasing the distance between the insertion holes 602, which is advantageous for the assembly of the heat exchanger 6 and improves the reliability of the heat exchanger 6. At the same time, the interference of the refrigerant flow in the first collecting pipe 621 can be reduced.

[0136] In another embodiment, all of the connecting portions 672 of the second plate body 632 pass through the first collecting pipe 621 and are connected to the second collecting pipe 622. In another embodiment, the connecting portions 672 of the first plate body 631 can pass through the second collecting pipe 622 and are connected to the first collecting pipe 621, and detailed description thereof is omitted here.

[0137] Here, the number of the first plates 631 and the second plates 632 can be selectively set according to actual applications, and is not specifically limited here.

[0138] The collecting pipe 620 may use the various collecting pipe arrangement methods described above, and detailed description thereof will be omitted here.

[0139] Furthermore, the main body of the plate 613 671 Since the first plate 631 and the second plate 632 have a linear structure, the main body 671 of the first plate 631 and the main body 671 of the second plate 632 can be directly welded together with solder.

[0140] In another embodiment, the main body 671 of the first plate 631 and the main body 671 of the second plate 632 are connected by the above-mentioned soldered connection piece, and the description thereof will be omitted here.

[0141] 4. Heat dissipation fins

[0142] 23 and 24, the heat exchanger 6 includes a heat exchange body 61 and a heat dissipation fin 65. The heat dissipation fin 65 is installed in the heat exchange body 61 and is thermally conductively connected to the heat exchange body 61, so that the heat dissipation fin 65 increases the contact area between the heat exchange body 61 and the air, promotes heat exchange with the air, improves the heat exchange efficiency of the heat exchanger 6, and improves the heat dissipation effect of the heat exchanger 6.

[0143] Here, the heat dissipating fins 65 may be connected to the surface of the heat exchange body 61 by welding, adhesive or fastening connection.

[0144] 23, the heat exchange body 61 includes at least two plate assemblies 603 arranged in parallel and spaced apart from each other. The heat dissipation fins 65 are installed on the at least two plate assemblies 603.

[0145] The heat exchanger 6 further includes a fixing plate 66. The fixing plate 66 covers the at least two plate assemblies 603 and the heat dissipation fins 65 at the same time, and the fixing plate 66 is located on the side of the heat dissipation fins 65 away from the plate assemblies 603, thereby forming a heat dissipation airway. In this way, the sealing of the heat dissipation fins 65 adopts the overall structure of the fixing plate 66, which has fewer parts and can simplify and ensure the production of the heat exchanger 6, and the heat dissipation airway formed at the same time can improve the heat dissipation effect. The airflow direction defined by the heat dissipation airway may be set along the spacing direction of the plate body assemblies, i.e., perpendicular to the extension direction of the plate body assemblies 603, thereby improving the heat dissipation efficiency of the heat exchange fins 65. In other embodiments, the airflow direction defined by the heat dissipation airway may be set along the extension direction of the plate body assemblies 603, or may be set at other angles to the extension direction of the plate body assemblies 603.

[0146] 23, the fixed plate 66 includes a top plate 661. The top plate 661 simultaneously covers the at least two plate assemblies 603 and the heat dissipation fins 65, and facilitates sealing of the heat dissipation fins 65.

[0147] In addition, the fixed plate 66 further includes at least one side plate 662. The side plate 662 is bent and connected to the top plate 661, and extends toward the plate assembly 603, sealing the heat dissipation air passage through the side plate 662, reducing the number of parts of the heat exchanger 6 and improving the sealing of the heat dissipation air passage.

[0148] Specifically, in one embodiment, the fixing plate 66 may include a top plate 661 and one side plate 662. The side plate 662 is bent and connected to one end of the top plate 661, and one end of the heat dissipating fin 65 abuts against the side plate 662, thereby closing the heat dissipating air passage. The other end of the heat dissipating fin 65 may be joined and assembled with other parts, or may abut against the box body of the electric control box described below, so that the heat dissipating fin 65 forms a complete air passage. In this manner, the package of the heat dissipating fin 65 can be simplified and the assembly efficiency can be improved.

[0149] In another embodiment, the number of side plates 662 is two. The two side plates 662 are spaced apart along a direction perpendicular to the spacing direction of the at least two plate assemblies 603, and the top plate 661 is bent and connected to the two side plates 662, respectively, to form an accommodation space, and the heat dissipation fins 65 are positioned in the accommodation space, i.e., between the two side plates 662. In this way, the fixing plate 66 can completely enclose the heat dissipation fins 65 and form an entire heat dissipation air passage, reducing the number of parts, further simplifying the packaging process of the heat dissipation fins 65, making the manufacture of the heat exchanger 6 simple and reliable, and improving the heat exchange capacity at the same time.

[0150] As shown in FIG. 24, the heat dissipation fins 65 are corrugated structures formed by extruding sheet material, and the peaks and valleys of the corrugated structure are brought into contact with the surfaces of the top plate 661 and the plate assembly 603 that face each other.

[0151] Optionally, the number of the heat dissipating fins 65 may be at least 2. As shown in Fig. 25, the number of the heat dissipating fins 65 may be equal to the number of the plate assemblies 603, and each heat dissipating fin 65 is installed on its corresponding plate assembly 603. The width of each heat dissipating fin 65 in the direction perpendicular to the extension direction of the plate assembly 603 may be the same as the width of its corresponding plate assembly 603, thereby improving the heat exchange capacity and saving material costs.

[0152] 25, each heat dissipating fin 65 can be attached to one plate assembly 603, and multiple heat dissipating fins 65 can be arranged at intervals from each other along the spacing direction of the plate assembly 603. In the welding process, the temperature of the gap between the plates 613 is higher than that of the plates 613, and this arrangement can prevent the heat dissipating fins 65 from melting and deforming. By arranging multiple heat dissipating fins 65 at intervals, it is possible to not only ensure the heat exchange efficiency of the heat dissipating fins 65, but also save materials and reduce production costs.

[0153] Alternatively, as shown in Fig. 26, the number of the heat dissipating fins 65 may be one, that is, the heat dissipating fins 65 are integrally installed and simultaneously installed on at least two plate assemblies 603. Here, the width of the heat dissipating fins 65 in the direction perpendicular to the extending direction of the plate assembly 603 may be equal to or greater than the width of the heat exchange body 61. In this way, the number of the integral heat dissipating fins 65 is small and the surface area is large, which on the one hand can facilitate the connection between the heat dissipating fins 65 and the heat exchange body 61, improving the attachment efficiency between the heat dissipating fins 65 and the heat exchange body 61, and on the other hand can increase the contact area between the heat dissipating fins 65 and the air, improving the heat exchange effect.

[0154] Furthermore, the fixing plate 66 is installed open along both ends of the spacing direction of the at least two plate assemblies 603, so that the flow direction of the airflow in the heat dissipation air passage is installed along the spacing direction of the at least two plate assemblies 603. Furthermore, the flow direction of the refrigerant in the plate assembly 603 is perpendicular to the spacing direction of the at least two plate assemblies 603, thereby improving the heat dissipation effect of the heat dissipation air passage and improving the heat exchange efficiency of the entire heat exchanger 6.

[0155] Here, each plate assembly 603 may be provided with a microchannel, for example, by using the various plate and microchannel combination methods mentioned above, which are not described in detail here.

[0156] As will be understood by those skilled in the art, the above-mentioned structure of the heat dissipation fins 65 may be applied to the various forms of the heat exchanger 6 described herein and should not be limited to a specific embodiment.

[0157] 5. The heat exchanger acts as a heat sink

[0158] The present application can also use the above heat exchanger 6 as a radiator (hereinafter described as radiator 6). The radiator 6 includes a heat exchange body 61 and a collecting pipe assembly 62, and the radiator 6 is installed to radiate heat to electronic components in an electric control box 7. As understood by those skilled in the art, it should be noted that the radiator 6 referred to in this specification should include various forms of heat exchangers described above and should not be limited to a specific embodiment.

[0159] In one embodiment, the radiator 6 serves as an economizer for the air conditioning system 1 and also serves as an electrical control box. 7 Instead of the module radiator in the air conditioner 1, it is used to radiate heat from the electrical control box 7, simplifying the number of duct assemblies and modules of the air conditioner system 1 and reducing the cost.

[0160] 27 , the electric control box 7 includes a box body 72 and a heat sink 6. A mounting cavity 721 is provided in the box body 72, the electronic component 71 is installed in the mounting cavity 721, and the heat sink 6 is installed in the mounting cavity 721 and used to dissipate heat of the electronic component 71 in the mounting cavity 721. In another embodiment, the heat sink 6 may also be disposed outside the box body 72 and configured to dissipate heat of the electronic component 71 in the mounting cavity 721.

[0161] 27, the box body 72 includes a top plate (not shown, disposed opposite the bottom plate 723 and covering the opening of the mounting cavity 721), a bottom plate 723, and a circumferential side plate 724. The top plate and the bottom plate 723 are disposed opposite each other with a gap therebetween, and the circumferential side plate 724 is connected to the top plate and the bottom plate 723, and further the mounting cavity 721 is formed.

[0162] Specifically, in FIG. 27, the bottom plate 723 and the top plate are rectangular. The number of circumferential side plates 724 is four. The four circumferential side plates 724 are connected to the sides of the corresponding bottom plate 723 and top plate, and the bottom plate 723 and the top plate are further surrounded to form a rectangular parallelepiped electric control box 7. The size of the long side of the bottom plate 723 is the length of the electric control box 7, and the size of the short side of the bottom plate 723 is the width of the electric control box 7. The height of the circumferential side plates 724 perpendicular to the bottom plate 723 is the height of the electric control box 7. As shown in FIG. 27, the length of the electric control box 7 in the X direction is the length of the electric control box 7, the length of the electric control box 7 in the Y direction is the height of the electric control box 7, and the length of the electric control box 7 in the Z direction is the width of the electric control box 7.

[0163] The following embodiments will describe in detail specific combinations of the heat sink 6 and the electric control box 7.

[0164] 5.1 Shape of heat exchange body

[0165] In one embodiment, the heat exchange body 61 is arranged in a straight strip, and as shown in FIG. 18, the heat exchange body 61 has an overall length, an overall width and an overall height. Here, the overall length is the length of the heat exchange body 61 along its extension direction, i.e., the length of the heat exchange body 61 in the X direction shown in FIG. 18. The overall width is the length of the heat exchange body 61 in a direction perpendicular to the extension direction of the heat exchange body 61 and perpendicular to the plane in which the heat exchange body 61 is located, i.e., the length of the heat exchange body 61 in the Y direction shown in FIG. 18. The overall height is the length of the heat exchange body 61 along the Z direction shown in FIG. 18. Here, the plane in which the heat exchange body 61 is located refers to the plane in which the collecting tube assembly 62 is located, i.e., the XOZ plane shown in FIG. 18.

[0166] In this embodiment, as shown in Fig. 27, the heat exchange body 61 can be installed on the bottom plate 723 of the electric control box 7. Alternatively, the heat exchange body 61 may be disposed on the circumferential side plate 724 of the electric control box 7. In other embodiments, the heat exchange body 61 may be further fixed to other positions of the electric control box 7 based on the installation positions of the electronic components 71, etc., and the embodiments of the present application are not specifically limited.

[0167] When the heat exchange body 61 is in the form of a straight strip as shown in Fig. 18, the heat exchange body 61 may be abutted against the bottom plate 723 or spaced apart from the bottom plate 723. In this way, the longitudinal dimension of the bottom plate 723 can be fully utilized, and the heat exchange body 61 can be installed as long as possible to improve the heat exchange effect. In other embodiments, the heat exchange body 61 may be abutted against the circumferential side plate 724 or spaced apart from the circumferential side plate 724, and the embodiments of the present application are not specifically limited.

[0168] 28, in order to reduce the overall length of the heat exchange body 61, the heat exchange body 61 can be divided into a first extension part 617 and a second extension part 618. The second extension part 618 is connected to an end of the first extension part 617 and bent toward one side of the first extension part 617, so that the heat exchange body 61 presents an L-shape.

[0169] By bending the heat exchanger body 61 to form the first extension portion 617 and the second extension portion 618 which are bent and connected, the overall length of the heat exchanger body 61 can be reduced, provided that the heat exchanger body 61 has a sufficient extension length, and thus the length along the X direction of the electric control box 7 combined with the radiator 6 can be reduced, thereby reducing the volume of the electric control box 7.

[0170] Specifically, the first extension 617 is disposed parallel to the bottom plate 723, so that the longitudinal dimension of the bottom plate 723 can be fully utilized, and the heat exchange body 61 can be disposed as long as possible to improve the heat exchange effect. The second extension 618 can be disposed parallel to the circumferential side plate 724, so that the space occupied by the second extension 618 in the X direction can be reduced.

[0171] Alternatively, the first extension portion 617 may be arranged parallel to one of the circumferential side plates 724, and the second extension portion 618 may be arranged parallel to the circumferential side plate 724 adjacent to that circumferential side plate 724, thereby positioning the heat sink 6 on one side of the mounting cavity 721.

[0172] Alternatively, the first extension portion 617 may be abutted against the bottom plate 723 or may be spaced apart from the bottom plate 723, and the second extension portion 618 may be abutted against the circumferential side plate 724 or may be spaced apart from the circumferential side plate 724, and the embodiments of the present application are not specifically limited.

[0173] 28, the number of the second extension parts 618 may be one. One second extension part 618 is connected to one end of the first extension part 617, so that the heat exchange body 61 has an L-shape.

[0174] 29, the number of second extension parts 618 may be two. The two second extension parts 618 are respectively connected to opposite ends of the first extension part 617, and are respectively bent to the same side of the first extension part 617.

[0175] Specifically, the two second extensions 618 may be installed in parallel at an interval between the opposing ends of the first extension 617, thereby further reducing the overall length of the heat exchange body 61 and reducing the volume of the radiator 6 while ensuring the heat exchange effect of the heat exchange body 61. In addition, the two second extensions 618 are installed by bending them to the same side of the first extension 617, and compared to the case where the two second extensions 618 are respectively located on both opposing sides of the first extension 617, the overall width of the radiator 6 can be made shorter.

[0176] Furthermore, the two second extensions 618 may be installed perpendicular to the first extension 617, thereby forming a U-shaped heat exchanging body 61. In this way, not only can the overall length of the heat exchanging body 61 be reduced, but also the space occupied by the second extensions 618 in the X-direction can be reduced, and interference between the two second extensions 618 and the electronic components 71 installed in the mounting cavity 721 can be avoided.

[0177] Alternatively, the two second extension parts 618 may be installed at an incline relative to the first extension part 617, and the inclination angles of the two second extension parts 618 relative to the first extension part 617 may be the same or different, thereby shortening the overall width of the electric control box 7.

[0178] Furthermore, the extension length of the first extension portion 617 is set to be greater than the extension length of the second extension portion 618, whereby the first extension portion 617 is installed along the longitudinal direction of the electrical control box 7, and the second extension portion 618 is installed along the width direction or height direction of the electrical control box 7.

[0179] 27, the number of heat sinks 6 provided in the mounting cavity 721 may be one. One heat sink 6 may extend along the longitudinal direction of the box body 72 and be installed in the mounting cavity 721. Alternatively, one heat sink 6 may extend along the height direction of the box body 72 and be installed in the mounting cavity 721.

[0180] Alternatively, the number of heat sinks 6 provided in the mounting cavity 721 may be at least two. For example, the number of heat sinks 6 may be two, three, four, five, etc. By installing a large number of heat sinks 6, the heat dissipation effect of the electric control box 7 can be improved.

[0181] 5.2 The radiator is installed in the electrical control box.

[0182] As can be understood by those skilled in the art, the heat sinks 6 of various forms disclosed in the present application can be installed in the mounting cavity 721 of the electrical control box 7 or applied to the heat dissipation of the electrical control box 7, and can be directly or indirectly thermally conductively connected to the electronic components 71.

[0183] 27, the heat sink 6 is installed in the mounting cavity 721 of the electric control box 7. Specifically, the heat sink 6 can be thermally connected to the electronic component 71 installed in the mounting cavity 721, and is used to dissipate heat from the electronic component 71.

[0184] Specifically, the electronic component 71 can be thermally conductively connected to the heat exchange body 61, and the electronic component 71 can be thermally conductively connected to any position of the heat exchange body 61.

[0185] When the heat exchange body 61 in the radiator 6 is in the form of a straight strip (i.e., the radiator 6 is I-shaped), the electronic components 71 can be installed at any position of the heat exchange body 61. This makes it easier to assemble the electronic components 71. For example, the electronic components 71 can be installed at the middle position of the heat exchange body 61, or the electronic components 71 can be installed at the positions of two ends of the heat exchange body 61. Alternatively, the electronic components 71 can be installed on one side of the heat exchange body 61, or the electronic components 71 can be installed on opposite sides of the heat exchange body 61 based on the actual application scenario.

[0186] In the embodiment shown in Figures 28 and 29, when the heat sink 6 is L-shaped or U-shaped, the electronic component 71 can be thermally connected to the first extension portion 617, and the electronic component 71 and the second extension portion 618 can be installed on the same side of the first extension portion 617, thereby shortening the height of the electrical control box 7, i.e., the dimension along the Y direction.

[0187] Alternatively, the electronic components 71 can be thermally connected to the second extension portion 618, specifically, the electronic components 71 can be disposed on the side of the second extension portion 618 facing the first extension portion 617, thereby shortening the length of the electrical control box 7, i.e., the dimension along the X direction.

[0188] Alternatively, some of the electronic components 71 may be disposed on the first extending portion 617 and some of the electronic components 71 may be disposed on the second extending portion 618, so that the electronic components 71 are uniformly distributed.

[0189] 27 and 30, a heat dissipation fixing plate 74 can be further installed on the electric control box 7. The electronic component 71 is installed on the heat dissipation fixing plate 74, and then the heat dissipation fixing plate 74 is connected to the heat exchanger body 61, and the electronic component 71 and the heat exchanger body 61 are thermally connected by the heat dissipation fixing plate 74, thus greatly improving the mounting efficiency of the electronic component 71.

[0190] Here, the heat dissipation fixing plate 74 may be made of a metal plate or an alloy plate having good thermal conductivity. For example, in order to improve the efficiency of thermal conduction, the heat dissipation fixing plate 74 may be made of an aluminum plate, a copper plate, an aluminum alloy plate, or the like.

[0191] 31, a heat pipe 741 can be fitted into the heat dissipation fixing plate 74. The heat pipe 741 is used to rapidly conduct the concentrated high-density heat source and disperse it over the entire surface of the heat dissipation fixing plate 74, thereby making the heat distribution of the heat dissipation fixing plate 74 uniform and improving the heat exchange effect between the heat dissipation fixing plate 74 and the heat exchange body 61.

[0192] Here, as shown in the upper drawing of Fig. 31, the heat pipe 741 may be installed in a long strip shape. The number of heat pipes 741 may be multiple. The multiple heat pipes 741 may be arranged in parallel with intervals. Alternatively, as shown in the lower drawing of Fig. 31, the multiple heat pipes 741 may be connected in sequence in a ring shape or frame shape, and the embodiment of the present application is not specifically limited.

[0193] 5.3 The heat sink is installed outside the electrical control box.

[0194] 32, the heat sink 6 is installed outside the electric control box 7. An attachment hole 726 can be opened on the box body 72 of the electric control box 7, and the electronic component 71 is thermally connected to the heat sink 6 through the attachment hole 726.

[0195] Specifically, as shown in FIG. 32, electronic components 71 are placed on the surface of a heat dissipating fixed plate 74 on the side remote from the heat sink 6.

[0196] Alternatively, as shown in Fig. 33, a heat pipe 741 may be provided to thermally connect the electronic component 71 to the heat sink 6. For example, the heat pipe 741 may include a heat absorption end 741a and a heat dissipation end 741b. The heat absorption end 741a of the heat pipe 741 may be inserted into the mounting cavity 721 and thermally connected to the electronic component 71, thereby absorbing the heat of the electronic component 71. The heat dissipation end 741b of the heat pipe 741 is installed outside the electric control box 7 and thermally connected to the heat sink 6, and the heat dissipation end 741b of the heat pipe 741 is used to dissipate heat.

[0197] 5.4 Heat sink fins and electronic component layout

[0198] 23 to 26, the heat sink 6 includes heat dissipation fins 65. When the heat sink 6 having the heat dissipation fins 65 is applied to the electric control box 7, the heat dissipation fins 65 increase the contact area between the heat exchange body 61 and the air in the electric control box 7, making it easier to exchange heat with the air, reducing the temperature in the mounting cavity 721, and protecting the electronic components 71.

[0199] Alternatively, the electronic component 71 and the heat dissipation fin 65 are a heat exchange body. 61The electronic components 71 and the heat dissipation fins 65 can be installed on the same side of the heat exchanger body 61, and the electronic components 71 and the heat dissipation fins 65 can be installed with a staggered arrangement to avoid interference between the electronic components 71 and the heat dissipation fins 65. The distance between the electronic components 71 and the heat dissipation fins 65 can be set large, so that the temperature of the refrigerant that comes into contact with the heat dissipation fins 65 and the electronic components 71 can be lowered, and the heat dissipation effect of the heat exchanger body 61 can be improved.

[0200] In another embodiment, the electronic components 71 are installed on one side of the heat exchange body 61, and the heat dissipation fins 65 are installed on the other side of the heat exchange body 61. Specifically, the heat dissipation fins 65 may be installed at any position on the other side of the heat exchange body 61.

[0201] In one embodiment, the heat dissipation fins 65 can extend to the outside of the electric control box 7. For example, an attachment hole is opened in the box body 72, the heat exchange body 61 is installed in the box body 72 and is thermally connected to the electronic components 71, one side of the heat dissipation fins 65 is thermally connected to the heat exchange body 61 and extends to the outside of the box body 72 through the attachment hole, and the heat dissipation capacity of the heat exchange body 61 can be further improved by the assistance of air cooling.

[0202] 6. Electronic components are installed at a position higher than the temperature of the heat sink.

[0203] 34, the electric control box 7 in this embodiment includes a box body 72, a heat sink 6, and an electronic component 71. A mounting cavity 721 is provided in the box body 72, the heat sink 6 is at least partially installed in the mounting cavity 721, and the electronic component 71 is installed in the mounting cavity 721. Here, the structures of the box body 72 and the heat sink 6 are substantially the same as those in the above embodiment, and the description of the above embodiment is referred to.

[0204] Alternatively, the entire heat exchange body 61 may be installed in the mounting cavity 721 of the electric control box 7. The heat exchange body 61 may also be partially installed in the mounting cavity 721 of the electric control box 7, partially protruding outside the electric control box 7, and used for connecting the collecting pipe assembly 62 with an external pipeline.

[0205] The flow of the refrigerant reduces the temperature of the radiator 6, and the heat generated by the electronic components 71 in the electric control box 7 increases the temperature in the mounting cavity 721 of the electric control box 7. The hot air in the electric control box 7 is likely to condense when it comes into contact with the radiator 6, and condensed water is formed on the surface of the radiator 6. If the generated condensed water flows to the position of the electronic components 71, it is likely to short-circuit or damage the electronic components 71, resulting in a more serious risk of fire.

[0206] Therefore, as shown in FIG. 34, the heat exchange body 61 can be divided into a first end 61a and a second end 61b along the flow direction of the refrigerant flow. When the heat exchange body 61 is operated, the temperature of the heat exchange body 61 gradually decreases in the direction from the first end 61a to the second end 61b, that is, the temperature of the first end 61a is higher than the temperature of the second end 61b. The electronic component 71 is disposed at a position close to the first end 61a, and the electronic component 71 and the heat exchange body 61 are thermally conductively connected. Note that the heat exchange body 61 needs to exchange heat with the internal environment or internal components of the electric control box 7, so the temperature of the heat exchange body 61 described above and below refers to the surface temperature of the heat exchange body 61. Specifically, the surface temperature change of the heat exchange body 61 is determined by the heat exchange channel adjacent to the surface. For example, when the heat exchange channel adjacent to the surface of the heat exchange body 61 is a main channel, the refrigerant flow in the main channel absorbs heat into the refrigerant flow in the auxiliary channel, so that the surface temperature of the heat exchange body 61 gradually decreases along the refrigerant flow direction of the main channel, and at this time, the refrigerant flow at the first end 61a along the main channel flows toward the upstream of the second end 61b. When the heat exchange channel adjacent to the surface of the heat exchange body 61 is an auxiliary channel, the surface temperature of the heat exchange body 61 gradually increases along the refrigerant flow direction of the auxiliary channel, and at this time, the refrigerant flow at the first end 61a along the auxiliary channel flows toward the downstream of the second end 61b.

[0207] Therefore, based on the temperature change of the heat exchange body 61 during operation, the heat exchange body 61 is divided into a first end 61a having a higher temperature and a second end 61b having a lower temperature. Since the temperature difference between the first end 61a having a higher temperature and the hot air is small, no condensed water is generated or the amount of condensed water generated is small. Therefore, by locating the electronic component 71 in a position close to the first end 61a, the probability of contact between the electronic component 71 and the condensed water can be reduced, and the electronic component 71 can be protected.

[0208] In addition, since air conditioners generally have a cooling mode and a heating mode, the flow direction of the refrigerant may be opposite in these two modes. At this time, the temperature of the heat exchange body 61 has an opposite change tendency from the first end 61a to the second end 61b, that is, in one mode, the temperature of the heat exchange body 61 gradually decreases from the first end 61a to the second end 61b, and in the other mode, the temperature of the heat exchange body 61 gradually increases from the first end 61a to the second end 61b. In this embodiment, when the cooling mode is prioritized, the temperature of the heat exchange body 61 gradually decreases from the first end 61a to the second end 61b. The reason is as follows.

[0209] When the environmental temperature is low, for example, when the air conditioner performs heating in winter, the air temperature in the electric control box 7 is low, and at this time, the temperature difference between the air in the electric control box 7 and the radiator 6 is small, and the air is not likely to condense to form condensed water. When the environmental temperature is high, for example, when the air conditioner performs cooling in summer, the air temperature in the electric control box 7 is high, and the temperature difference between the air in the electric control box 7 and the radiator 6 is large, and the air is likely to condense to form condensed water. Thus, in this embodiment, at least in the cooling mode of the air conditioner, the temperature of the heat exchange body 61 is gradually reduced in the direction from the first end 61a to the second end 61b, thereby preventing the radiator 6 from generating condensed water in the cooling mode.

[0210] Furthermore, placing the electronic component 71 in a position close to the first end 61a results in a first distance between the thermal conductive connection position of the electronic component 71 in the heat exchange body 61 and the first end 61a, and a second distance between the thermal conductive connection position of the electronic component 71 in the heat exchange body 61 and the second end 61b, the first distance being smaller than the second distance.

[0211] Specifically, the temperature of the heat exchange body 61 gradually decreases in the direction from the first end 61a to the second end 61b, so that the temperature of the first end 61a is the highest and the temperature of the second end 61b is the lowest. The higher the temperature of the heat exchange body 61, the smaller the temperature difference with the air in the electric control box 7, and the less likely the condensed water will condense. The lower the temperature of the heat exchange body 61, the larger the temperature difference with the hot air, and the more likely the condensed water will condense. That is, in the direction from the first end 61a to the second end 61b of the heat exchange body 61, the more likely the condensed water will be generated. As a result, the electronic component 71 is installed at the end of the heat exchange body 61 where the temperature is high, that is, at a position where the condensed water is less likely to accumulate, thereby reducing the risk of contact between the electronic component 71 and the condensed water and further protecting the electronic component 71.

[0212] 34, the extension direction of the heat exchanger body 61 may be vertical, and the first end 61a may be located above the second end 61b. Thus, when condensed water is generated at a position of the heat exchanger body 61 adjacent to the second end 61b, the condensed water may flow downward along the vertical direction, i.e., the condensed water may flow in a direction away from the electronic components 71, thereby avoiding contact between the electronic components 71 and the condensed water.

[0213] Alternatively, if necessary, the extension direction of the heat exchange body 61 may be installed along the horizontal direction, so that condensed water generated in a position close to the second end 61b can be quickly separated from the heat exchange body 61 by the action of gravity and prevented from contacting the electronic components 71. Alternatively, in other embodiments, the extension direction of the heat exchange body 61 may be installed at an incline with respect to the horizontal direction, and the embodiments of the present application are not specifically limited.

[0214] Of course, the structure of the radiator 6 in this embodiment may be the same as the above embodiment, i.e. adopting a folded heat exchange body 61. Alternatively, the structure of the radiator 6 in this embodiment may adopt a straight strip-shaped heat exchange body 61. Alternatively, in addition to the above-mentioned radiator 6 with microchannels, other types of radiators may be used, and the embodiments of the present application do not limit the specific configuration of the radiator 6. Furthermore, other embodiments of the present application in which the radiator is applied to an electric control box may use various radiators disclosed herein, or other radiators known in the art.

[0215] 7. Condensation protection

[0216] As shown in FIG. 35, the electric control box 7 in this embodiment includes a box body 72, a mounting plate 76, electronic components 71 and a heat sink 6.

[0217] Wherein, a mounting cavity 721 is provided in the box body 72, and the mounting plate 76 is installed in the mounting cavity 721, so that the mounting cavity 721 forms a first cavity 7212 and a second cavity 7214 located on both sides of the mounting plate 76. An electronic component 71 is installed in the second cavity 7214, and at least a portion of the heat exchange body 61 is disposed in the first cavity 7212 and is thermally connected to the electronic component 71. The mounting plate 76 is used to block condensed water of the radiator 6 from flowing into the second cavity 7214.

[0218] By installing a mounting plate 76 that divides the mounting cavity 721 on the electrical control box 7, and by installing the heat exchange body 61 and the electronic component 71 in the first cavity 7212 and the second cavity 7214 that are independent of each other, respectively, the electronic component 71 can be completely isolated from the condensed water, thereby preventing the electronic component 71 from coming into contact with the condensed water and being short-circuited or damaged.

[0219] Furthermore, the heat dissipation fixing plate 74 can be used to indirectly connect the electronic component 71 and the heat exchange body 61 .

[0220] Specifically, the mounting plate 76 has an escape hole 762 formed at a position corresponding to the heat dissipation fixing plate 74, the heat dissipation fixing plate 74 is connected to the heat exchanger body 61 and closes the escape hole 762, and the electronic component 71 is provided on the side of the heat dissipation fixing plate 74 away from the heat exchanger body 61. In this way, the heat dissipation fixing plate 74 can thermally connect the electronic component 71 and the heat exchanger body 61, and the heat dissipation fixing plate 74 can separate the first cavity 7212 and the second cavity 7214, thereby preventing the condensed water from passing through the escape hole 762 and flowing into the second cavity 7214 in which the electronic component 71 is provided, and further preventing the condensed water from contacting the electronic component 71.

[0221] Furthermore, when a large amount of condensed water is generated in the heat exchange body 61, the condensed water accumulates and then falls due to gravity, and the dripping condensed water is prone to scattering, which poses a danger to the circuit in the electrical control box 7 and is also disadvantageous in discharging the dispersed condensed water from the electrical control box 7.

[0222] 35, a baffle plate 77 can be installed on the electric control box 7, and the baffle plate 77 is installed under the radiator 6 and used to collect the condensed water dripping from the radiator 6. The arrangement of the baffle plate 77 not only reduces the height of the dripped condensed water, but also prevents the condensed water from scattering, and the baffle plate 77 also has a certain accumulation effect on the condensed water, which helps the condensed water to be discharged together from the electric control box 7 after being merged.

[0223] As shown in Figure 35, the flow guide plate 77 is fixed to the bottom plate 723 of the electric control box 7, one end of the flow guide plate 77 is connected to the bottom plate 723, the other end of the flow guide plate 77 extends into the first cavity 7212, and the projection of the radiator 6 along the vertical direction is located inside the flow guide plate 77. In this way, it can be ensured that all the condensed water dripping from the radiator 6 is located on the flow guide plate 77, and the condensed water is prevented from dripping to other positions on the electric control box 7.

[0224] Of course, the heat sink 6 may further be installed on the mounting plate 76. In this case, one end of the flow guide plate 77 is connected to the mounting plate 76, the other end of the flow guide plate 77 extends into the first cavity 7212, and the projection of the heat sink 6 along the vertical direction is located inside the flow guide plate 77.

[0225] Furthermore, as shown in FIG. 36 , in order to facilitate the condensed water on the flow guide plate 77 to be immediately discharged from the electric control box 7, a drainage hole 725 may be further provided on the bottom wall of the box body 72, and the flow guide plate 77 may be installed at an incline relative to the bottom wall of the box body 72, so that the condensed water can be guided by the flow guide plate 77 and then discharged from the box body 72 through the drainage hole 725.

[0226] Specifically, a drain outlet 725 is opened in the circumferential side plate 724 of the electrical control box 7, and a flow guide plate 77 is connected to the mounting plate 76 or the bottom plate 723 of the box body 72 and is installed at an incline toward the drain outlet 725. After the condensed water drips onto the flow guide plate 77, it is collected at the position of the drain outlet 725 along the inclined flow guide plate 77 and then discharged from the electrical control box 7 through the drain outlet 725.

[0227] Here, the number and size of the drain holes 725 can be flexibly set according to the amount of condensed water, and the embodiment of the present application is not specifically limited thereto.

[0228] In this embodiment, the flow direction of the refrigerant in the heat exchange body 61 can be set along the horizontal direction, that is, the extension direction of the heat exchange body 61 can be set along the horizontal direction, while the flow path of the condensed water in the heat exchange body 61 can be shortened, so that the condensed water can be quickly dripped onto the flow guide plate 77 by gravity, and the condensed water can be easily discharged from the electric control box 7 in a timely manner and prevented from contacting the electronic components 71 installed in the mounting cavity 721. Meanwhile, the interference between the flow guide plate 77 and the heat exchange body 61 can be avoided, so that a relatively long heat exchange body 61 can be set, and the heat exchange efficiency of the radiator 6 can be improved.

[0229] 37, the height of the baffle plate 77 along the vertical direction is gradually reduced from the central region to both ends of the baffle plate 77, so that the condensed water dropped on the baffle plate 77 flows to both ends of the baffle plate 77. That is, the baffle plate 77 is installed in an inverted V-shape, in which case the overall height of the baffle plate 77 along the vertical direction can be reduced, the interference between the baffle plate 77 and other components in the electric control box 7 can be avoided, and the radiator 6 can quickly discharge the condensed water dropped on the baffle plate 77.

[0230] 37, a first drain outlet 771 and a second drain outlet 772 are provided in the box body 72, which correspond to both ends of the flow guide plate 77, so that the condensed water that has flowed to both ends of the flow guide plate 77 can be drained. The condensed water that has dripped onto the flow guide plate 77 flows toward both ends of the flow guide plate 77 and is drained from the box body 72 through the first drain outlet 771 and the second drain outlet 772.

[0231] 38, the height of the baffle plate 77 in the vertical direction gradually increases from the central region of the baffle plate 77 to both ends, so that the condensed water that falls on the baffle plate 77 flows into the central region of the baffle plate 77. That is, the baffle plate 77 can be installed in a V-shape. In this manner, the condensed water can be concentrated in the central region of the baffle plate through the baffle plate 77 and discharged from the central region.

[0232] 38, a drain hole 725 is provided in the box body 72 at a position corresponding to the central area of ​​the flow guide plate 77, so that the condensed water that has flowed into the central area of ​​the flow guide plate 77 can be discharged. This makes it easy to collect and discharge the condensed water.

[0233] The number and size of the drain port 725, the first drain port 771 and the second drain port 772 can be flexibly set according to the amount of condensed water, and the embodiment of the present application is not specifically limited.

[0234] In addition, the above-mentioned flow guide plate 77 may be attached to the electric control box 7 by other mounting methods and installed below the heat sink 6 for dissipating heat from the electronic components 71 in the electric control box 7, and is not limited to the above-mentioned embodiment.

[0235] 8. Electronic components are installed upstream of the heat sink, and heat dissipation fins are installed downstream.

[0236] As shown in Fig. 39, a mounting cavity 721 is provided in a box body 72, and at least a part of a heat exchange body 61 is provided in the mounting cavity 721. An electronic component 71 is thermally conductively connected to the heat exchange body 61 at a first position, and a heat dissipation fin 65 is thermally conductively connected to the heat exchange body 61 at a second position. Here, the first position and the second position are installed at an interval from each other along the flow direction of the refrigerant flow in the heat exchange body 61. As described above, the refrigerant flow referred to here may be the refrigerant flow of the main channel in the air conditioning system shown in Figs. 1 to 4, or may be the refrigerant flow of the auxiliary channel.

[0237] In this embodiment, the electronic component 71 and the heat dissipation fins 65 are installed at intervals along the flow direction of the refrigerant flow in the heat exchange body 61, thereby making full use of the space in the heat exchange body 61. Not only can the heat exchange body 61 dissipate heat from the electronic component 71, but the heat dissipation fins 65 can also reduce the temperature in the mounting cavity 721 of the electrical control box 7, and further protect the electronic component 71 installed in the mounting cavity 721.

[0238] Furthermore, the heat exchange body 61 includes a first end 61a and a second end 61b spaced apart from each other along the flow direction of the refrigerant flow. Here, the temperature of the heat exchange body 61 gradually decreases in the direction from the first end 61a to the second end 61b, i.e., the temperature of the first end 61a is higher than the temperature of the second end 61b. The first position is located closer to the first end 61a than the second position.

[0239] Specifically, during the operation of the heat exchange body 61, the temperature of the surface of the heat exchange body 61 changes according to the flow direction of the refrigerant flow, and a first end 61a with a high temperature and a second end 61b with a low temperature are formed. Since the temperature difference between the first end 61a with a high temperature and the hot air in the mounting cavity 721 is small, condensation water is unlikely to occur, so that the electronic component 71 can be installed close to the first end 61a, that is, the first position is installed at a position close to the first end 61a. Since the temperature difference between the second end 61b with a low temperature and the hot air in the mounting cavity 721 is large, condensation water is likely to occur, so that the heat dissipation fins 65 can be installed close to the second end 61b. On the other hand, if the temperature of the heat dissipation fins 65 is low, the temperature difference between the heat dissipation fins 65 and the hot air is sufficiently large, which is favorable for the heat dissipation of the electric control box 7. On the other hand, the condensed water formed by condensation on the heat dissipation fins 65 is also evaporated by the action of the hot air, and as the condensed water evaporates and absorbs heat, the temperature of the refrigerant flow is further reduced, thereby improving the heat exchange effect of the radiator 6.

[0240] 8.1 Accelerating the flow rate of heat dissipation air

[0241] 40, a heat dissipation fan 78 can be further installed in the electric control box 7. The heat dissipation fan 78 is used to form a heat dissipation airflow acting on the heat dissipation fins 65 in the electric control box 7. This can accelerate the flow rate of the heat dissipation airflow and further improve the heat exchange effect.

[0242] In addition, the heat dissipation fan 78 can be installed in the vicinity of the heat dissipation fins 65 and can directly act on the heat dissipation fins 65 .

[0243] 40, a mounting plate 76 may be further installed on the electric control box 7, and the mounting plate 76 is installed in the mounting cavity 721, so that the mounting cavity 721 has a first cavity 7212 and a second cavity 7214 located on both sides of the mounting plate 76. The mounting plate 76 has a first vent 764 and a second vent 766 spaced apart from each other, so that the gas in the first cavity 7212 flows into the second cavity 7214 through the first vent 764, and the gas in the second cavity 7214 flows into the first cavity 7212 through the second vent 766. At least a portion of the heat exchange body 61 is disposed in the first cavity 7212, and the electronic component 71 and the heat dissipation fan 78 are disposed in the second cavity 7214.

[0244] By using the mounting plate 76 to separate the mounting cavity 721 to form two mutually independent first and second cavities 7212 and 7214, a circulating airflow can be formed in the first and second cavities 7212 and 7214, thereby increasing the amount of air coming into contact with the heat dissipation fins 65 provided in the first cavity 7212, and the airflow after being cooled can facilitate heat dissipation of the electronic components 71 installed in the second cavity 7214, thereby preventing mixed gas flows and improving the heat dissipation efficiency of the heat dissipation fins 65.

[0245] Here, the heat dissipation fan 78 installed in the second cavity 7214 is used to accelerate the air flow speed in the second cavity 7214, and further accelerate the air circulation speed between the first cavity 7212 and the second cavity 7214, thereby improving the heat dissipation efficiency of the electrical control box 7.

[0246] Furthermore, the heat dissipating fins 65 can be arranged so that the flow direction of the heat dissipating airflow passing through them is perpendicular to the flow direction of the refrigerant.

[0247] As shown in Figures 39 and 40, when the refrigerant flow in the heat exchange body 61 flows along the horizontal direction, the heat dissipation air flow can be installed to flow along the vertical direction, thereby preventing the heat dissipation air flow from flowing to the position of the electronic component 71.

[0248] Specifically, the first ventilation holes 764 and the second ventilation holes 766 may be installed at intervals on opposite sides of the heat dissipation fin 65 along the vertical direction. Here, the number and arrangement density of the first ventilation holes 764 and the second ventilation holes 766 may be set as necessary.

[0249] Alternatively, when the refrigerant flow in the heat exchange body 61 is along the vertical direction, the heat dissipation airflow can be set to flow along the horizontal direction, thereby preventing the heat dissipation airflow from flowing to the position of the electronic components 71. Alternatively, the flow direction of the heat dissipation airflow and the flow direction of the refrigerant flow can be set along other two directions perpendicular to each other, and the embodiment of the present application is not specifically limited.

[0250] Furthermore, when using the first vent 764 and the second vent 766 installed vertically, the first vent 764 can be installed above the second vent 766, so that the hot air entering the first cavity 7212 through the second vent 766 automatically rises to the position of the heat exchange body 61 and exchanges heat with the heat exchange body 61.

[0251] In addition, the heat dissipation fan 78 can be installed close to the first ventilation hole 764, so that the cold air located at the top of the first cavity 7212 can immediately enter the second cavity 7214, and the heat dissipation fan 78 can accelerate the cold air to improve the heat dissipation efficiency of the electronic component 71.

[0252] 9. Internal circulation

[0253] Generally, in order to cool the electric control box 7, a heat dissipation hole communicating with the mounting cavity 721 is generally provided in the box body 72 of the electric control box 7, so that heat exchange occurs through natural convection with the outside air through the heat dissipation hole, and the temperature of the electric control box 7 is further reduced. However, when the heat dissipation hole is provided in the box body 72, the sealing performance of the electric control box 7 is reduced, and impurities such as moisture and dust from the outside enter the mounting cavity 721 through the heat dissipation hole, which further damages the electronic components installed in the mounting cavity 721.

[0254] In order to solve the above problem, the present embodiment can install the box body 72 of the electric control box 7 in a sealed structure. Specifically, as shown in FIG 41, the electric control box 7 includes a box body 72, a mounting plate 76, a heat sink 6, electronic components 71 and a heat dissipation fan 78.

[0255] The box body 72 is provided with a mounting cavity 721, and the mounting plate 76 is installed in the mounting cavity 721, so that the mounting cavity 721 forms a first cavity 7212 and a second cavity 7214 located on both sides of the mounting plate 76. The mounting plate 76 is provided with a first ventilation hole 764 and a second ventilation hole 766 spaced apart from each other, and the first ventilation hole 764 and the second ventilation hole 766 communicate with the first cavity 7212 and the second cavity 7214. At least a part of the heat sink 6 is disposed in the first cavity 7212, and the electronic component 71 is disposed in the second cavity 7214 and is thermally conductively connected with the heat sink 6. The heat sink fan 78 is used for blowing air, and the gas in the first cavity 7212 flows into the second cavity 7214 through the first ventilation hole 764.

[0256] In this embodiment, at least a part of the heat sink 6 is disposed in the first cavity 7212, the electronic component 71 and the heat sink fan 78 are disposed in the second cavity 7214, and the first vent 764 and the second vent 766 are provided on the mounting plate 76 at an interval to communicate the first cavity 7212 and the second cavity 7214. As a result, the electronic component 71 generates heat, the temperature of the air in the second cavity 7214 increases, and the heat sink fan 78 sends the hot air to the second vent 766. Since the density of the hot air is small, the hot air naturally rises and comes into contact with the heat sink 6 disposed in the first cavity 7212, and the heat sink 6 is used to reduce the temperature of the hot air and form cool air. The cool air flows into the second cavity 7214 from the first vent 764. The heat dissipation fan 78 is used to accelerate the cool air, which is used to cool the electronic components 71 installed in the second cavity 7214, and the temperature of the air after heat exchange with the electronic components 71 is increased, and the cooled air with increased temperature is sent to the second ventilation port 766 by the action of the heat dissipation fan 78, and circulates in this manner to cool the electronic components 71 installed in the electric control box 7 by an internal circulation manner. Compared with cooling the electric control box 7 by opening a heat dissipation hole, the electric control box 7 of the present application is a completely sealed electric control box 7, which can effectively solve the problems of waterproofing, insect proofing, dust proofing and moisture proofing, and improve the reliability of the electric control of the electric control box 7.

[0257] 42, the plane on which the heat dissipation fan 78 is located is perpendicular to the plane on which the mounting plate 76 is located. The downwind side of the heat dissipation fan 78 is installed toward the first vent 764.

[0258] Specifically, the heat dissipation fan 78 may be installed on one side of the mounting plate 76 facing the second cavity 7214. The rotation axis direction of the heat dissipation fan 78 is parallel to the plane on which the mounting plate 76 is located. The downwind side of the heat dissipation fan 78 refers to the intake side of the heat dissipation fan 78. In this embodiment, the heat dissipation fan 78 can be installed between the first ventilation hole 764 and the electronic component 71, and the cool air that enters the second cavity 7214 through the first ventilation hole 764 is accelerated by the heat dissipation fan 78 and then flows out, improving the flow rate of the cool air and improving the heat dissipation efficiency of the electric control box 7.

[0259] In another embodiment, as shown in FIG. 43, the heat dissipation fan 78 may be configured as a centrifugal fan.

[0260] Here, the centrifugal fan is a machine that relies on input mechanical energy to increase gas pressure and exhaust the gas. The operating principle of the centrifugal fan is to accelerate the gas by using a high-speed rotating impeller. As a result, in this embodiment, by using a centrifugal fan as the heat dissipation fan 78, on the one hand, high-speed cool air can be obtained and the heat dissipation efficiency of the electronic components 71 can be improved, and on the other hand, the centrifugal fan can also simplify the structure of the heat dissipation fan 78 and improve the installation efficiency.

[0261] In addition, air guide plates (not shown) can be installed at intervals on the mounting plate 76, and an air guide passage is formed between the air guide plates to guide the air blown out from the heat dissipation fan 78.

[0262] For example, two parallel air guide plates spaced apart from each other may be installed between the dispersedly arranged electronic components 71. The extension direction of the air guide plates is arranged along the spacing direction of the electronic components 71, and an air guide channel along the spacing direction of the electronic components 71 is defined between the two air guide plates. The cool air blown out by the heat dissipation fan 78 first flows to the positions of some of the electronic components 71, causing the electronic components 71 to dissipate heat, and the air that has passed through the some of the electronic components 71 further flows to the positions of other electronic components 71 through the air guide channel, and is used to dissipate heat from the other electronic components 71. This makes it possible to more evenly distribute the heat loss of the electronic components 71, and to prevent the temperature of a local electronic component 71 from becoming too high and causing damage.

[0263] Here, a radiator 6 can be installed in the electric control box 7 , that is, a heat exchange body 61 can be installed in the first cavity 7212 , and used to reduce the temperature of the air in the first cavity 7212 .

[0264] Alternatively, the heat sink 6 may be installed outside the electric control box 7, and at least a part of the heat sink 6 may be extended into the first cavity 7212. For example, the heat sink 6 may be installed in the heat exchange body 61 and Collector Pipe Assembly In the case where the heat exchanger body 61 includes the heat exchanger body 61 and the heat dissipation fins 65, the box body 72 may have an attachment port (not shown) communicating with the first cavity 7212. In this case, the heat exchanger body 61 is connected to the outer wall of the box body 72, and the heat dissipation fins 65 are connected to the heat exchanger body 61 and inserted into the first cavity 7212 through the attachment port.

[0265] Here, the combination manner of the radiator 6 and the electric control box 7 in this embodiment is the same as that in the above embodiment, so please refer to the description of the above embodiment and the description will be omitted here.

[0266] As shown in FIG. 43, an electronic component 71 can be placed within the blowing range of a heat dissipation fan 78, so that the heat dissipation fan 78 can directly act on the electronic component 71 to lower the temperature of the electronic component 71.

[0267] Here, the electronic component 71 may include main heat generating components with large heat generation, such as a common mode inductor 711, a reactance 712, and a capacitor 713, and sub-heat generating components with small heat generation, such as a blower module 714. In order to improve the heat dissipation efficiency of the main heat generating components, the distance between the main heat generating components and the first ventilation port 764 may be set to be smaller than the distance between the sub-heat generating components and the first ventilation port 764, i.e., the main heat generating components with large heat generation are installed in a position close to the first ventilation port 764, and the sub-heat generating components with small heat generation are installed in a position away from the first ventilation port 764. As a result, the low-temperature air flowing in from the first ventilation port 764 first acts on the main heat generating components with large heat generation, improving the heat dissipation efficiency of the main heat generating components with large heat generation.

[0268] Alternatively, the second ventilation hole 766 may be provided at the end where the heat dissipation fan 78 blows air, and opened at a position close to the electronic components 71 that generate a large amount of heat, so that on the one hand, the radiation range of the heat dissipation fan 78 can be expanded and the efficiency of air circulation in the second cavity 7214 can be improved, and on the other hand, the hot air after heat exchange with the electronic components 71 that generate a large amount of heat can be discharged from the second cavity 7214, thereby avoiding an increase in the temperature of the entire second cavity 7214.

[0269] Furthermore, the second ventilation opening 766 can be installed in a position adjacent to the first ventilation opening 764, shortening the air circulation path in the second cavity 7214, reducing the air flow resistance, improving the air circulation efficiency, and further improving the heat dissipation efficiency of the electrical control box 7.

[0270] Furthermore, the sizes of the first ventilation opening 764 and the second ventilation opening 766 may be set according to the arrangement of the electronic components 71.

[0271] Specifically, the number of the second ventilation openings 766 may be more than one. The multiple second ventilation openings 766 are disposed at different positions on the mounting plate 76. The size of the second ventilation openings 766 provided at the position of the electronic component 71 that generates a large amount of heat may be set to be relatively large, the number of the second ventilation openings 766 may be set to be relatively large, and the distribution density of the multiple second ventilation openings 766 may be set to be relatively large. The size of the second ventilation openings 766 provided at the position of the electronic component 71 that generates a small amount of heat may be set to be relatively small, the number of the second ventilation openings 766 may be set to be relatively small, and the distribution density of the multiple second ventilation openings 766 may be set to be relatively small.

[0272] Furthermore, by setting the dimensions of the first ventilation opening 764 to be larger than the dimensions of the second ventilation opening 766, the return air volume can be increased, and the efficiency of the heat dissipation fan 78 can be improved.

[0273] 10. Natural Convection

[0274] As shown in FIGS. 44 and 45 , in this embodiment, the electric control box 7 includes a box body 72 , a mounting plate 76 , a radiator 6 and a main heat generating component 715 .

[0275] Here, a mounting cavity 721 is provided in the box body 72, and a mounting plate 76 is installed in the mounting cavity 721, so that the mounting cavity 721 forms a first cavity 7212 and a second cavity 7214 located on both sides of the mounting plate 76. A first vent 764 and a second vent 766 are provided in the mounting plate 76, spaced apart along the vertical direction. At least a portion of the heat sink 6 is provided in the first cavity 7212. A main heat generating component 715 is provided in the second cavity 7214. The first vent 764 and the second vent 766 communicate the first cavity 7212 and the second cavity 7214, and generate a heat dissipation airflow circulating between the first cavity 7212 and the second cavity 7214 by utilizing the temperature difference between the main heat generating component 715 and the heat sink 6.

[0276] Specifically, the main heat generating component 715 is disposed in the second cavity 7214. The heat generated by the operation of the main heat generating component 715 increases the temperature in the second cavity 7214. Since the density of the hot air is low, the hot air naturally rises and enters the first cavity 7212 through the first ventilation hole 764 at the top of the second cavity 7214. After the hot air comes into contact with the heat sink 6, it exchanges heat with the heat sink 6, lowering the temperature of the hot air and increasing its density. The hot air is then naturally sinks to the bottom of the first cavity 7212 due to the action of gravity, enters the second cavity 7214 through the second air vent 766, and is used to cool the main heat-generating component 715 provided in the second cavity 7214.After exchanging heat with the main heat-generating component 715, the hot air further rises to the position of the first air vent 764, thereby forming an internal circulating airflow between the first cavity 72142 and the second cavity 7214.

[0277] In this embodiment, the mounting plate 76 is provided with a first ventilation hole 764 and a second ventilation hole 766, which communicate the first cavity 7212 and the second cavity 7214, and are arranged vertically. This allows air to circulate between the first cavity 7212 and the second cavity 7214 by using the weight of air, thereby lowering the temperature of the electronic components 71 installed in the second cavity 7214, and lowering the temperature of the electric control box 7. Compared with the solution of using the heat dissipation fan 78 to blow air, the structure of the electric control box 7 in this embodiment is simple, which can improve the assembly efficiency of the electric control box 7 and reduce the manufacturing cost of the electric control box 7.

[0278] Also, the heat sink 6 may be installed above the main heat generating component 715 along the direction of gravity, i.e., the heat sink 6 is installed near the top of the first cavity 7212, and the main heat generating component 715 is installed near the bottom of the second cavity 7214. This arrangement can reduce the distance between the heat sink 6 and the first vent 764, so that the hot air entering the first cavity 7212 through the first vent 764 quickly comes into contact with the heat sink 6, cools down, and naturally sinks due to gravity. By reducing the distance between the main heat generating component 715 and the second vent 766, the hot air entering the second cavity 7214 through the second vent 766 quickly comes into contact with the main heat generating component 715, heats up, and naturally rises due to buoyancy, so that the circulation speed of the airflow in the electric control box 7 can be improved, and the heat dissipation efficiency can be improved.

[0279] 45 , a sub-heating component 716 can be further installed in the electric control box 7. The sub-heating component 716 is installed in the second cavity 7214 and is thermally conductively connected to the heat exchange body 61. Here, the heat generation amount of the sub-heating component 716 is smaller than that of the main heat generation component 715.

[0280] Specifically, in this embodiment, the main heat generating component 715 with a large heat generation amount can be installed at a position close to the second ventilation port 766. On the one hand, the cold air entering through the first cavity 7212 is first brought into contact with the electronic component 71 with a large heat generation amount, thereby improving the heat dissipation efficiency of the electronic component 71. On the other hand, a large temperature difference is created between the cold air and the electronic component 71 with a large heat generation amount, so that the cold air can be quickly heated and then quickly raised by the effect of buoyancy. The auxiliary heat generating component 716 with a small heat generation amount is installed in the heat exchange body 61 and brought into contact with the heat exchange body 61, so that the electronic component 71 with a small heat generation amount can be directly cooled by using the heat exchange body 61. In this way, the main heat generating component 715 with a large heat generation amount and the auxiliary heat generating component 716 with a small heat generation amount are arranged in different regions, so that the distribution of the electronic components 71 can be rationalized and the internal space of the electric control box 7 can be fully utilized.

[0281] Optionally, the sub-heat-generating component 716 is connected to the heat exchange body 61 via a heat dissipating fixing plate 74, thereby improving the assembly efficiency of the sub-heat-generating component 716.

[0282] Here, the connection method between the sub-heat generating component 716 and the heat exchange body 61 may be the same as that in the above embodiment, and for specific details, refer to the description of the above embodiment, and detailed description will be omitted here.

[0283] Alternatively, the heat sink 6 may be installed outside the electric control box 7 , and at least a portion of the heat sink 6 may be extended and installed in the first cavity 7212 .

[0284] Here, the combination manner of the radiator 6 and the electric control box 7 is the same as that of the above embodiment, so please refer to the description of the above embodiment.

[0285] 11. A drain sleeve is installed in the pipe.

[0286] As shown in FIGS. 46 and 47, the air conditioning system 1 of this embodiment includes a radiator 6, a pipe 710 and a drain sleeve 79.

[0287] The conduit 710 is connected to the radiator 6 and is used to provide a refrigerant flow to the radiator 6 or to collect the refrigerant flow exiting the radiator 6. Specifically, the conduit 710 is connected to a collecting pipe assembly of the radiator 6.

[0288] Wherein, the pipe 710 can include an input pipe and an output pipe, the input pipe is used for supplying the refrigerant flow to the radiator 6, and the output pipe is used for collecting the refrigerant flow in the radiator 6.

[0289] The drain sleeve 79 is fitted into the pipe 710 and is used to drain the condensed water formed in the pipe 710 or flowing through the pipe. The drain sleeve 79 can guide the condensed water in the pipe 710 and protect the pipe 710, thereby improving the reliability of the air conditioning system 1.

[0290] Specifically, as shown in FIG. 48, the drain sleeve 79 includes a sleeve body 791 and a flange 792 .

[0291] The sleeve body 791 is provided with an insertion hole 793 and a drain groove 708. The insertion hole 793 is used to accommodate the pipeline 710. The number and size of the insertion holes 793 can be set according to the distribution and size of the pipeline 710. For example, in the embodiment shown in FIG. 46, the number of the insertion holes 793 may be two. In other embodiments, the number of the insertion holes 793 may be one, three, etc.

[0292] The sleeve body 791 may be made of a flexible material, such as thermoplastic polyurethane elastomer rubber, to protect the conduit 710 and prevent it from coming into contact with and wearing away from the electrical control box sheet metal when the conduit 710 vibrates.

[0293] The flange 792 is installed on the end surface of the sleeve body 791 and is located on the outer periphery of the insertion hole 793, and is combined with the sleeve body 791 to form a water collection groove 794. The water collection groove 794 is used to collect condensed water in the pipe 710. The drain groove 708 is connected to the water collection groove 794 and is used to drain the condensed water in the water collection groove 794. When the air conditioning system is running, the condensed water flows along the pipe 710 into the water collection groove 794 of the drain sleeve 79, and is then drained through the drain groove 708 in the sleeve body 791.

[0294] As shown in Figure 48, the flange 792 The outer wall of the sleeve 792 is flush with the outer wall of the sleeve body 791, thereby increasing the volume of the water collection groove 794, thereby making it easier to collect condensed water.

[0295] The pipe 710 may be arranged along the direction of gravity. The sleeve body 791 includes opposing upper and lower end surfaces. The flange 792 and the water collecting groove 794 are arranged on the upper end surface of the sleeve body 791, and the drain groove 708 communicates with the upper and lower end surfaces of the sleeve body 791. The condensed water in the pipe 710 can flow into the water collecting groove 794 under the action of gravity, and then the condensed water can be discharged by the drain groove 708 communicated with the water collecting groove 794. In this way, automatic drainage can be realized for the condensed water in the pipe 710. In other embodiments, the pipe 710 may be arranged with an inclination to fit different application scenarios.

[0296] 48, the drain groove 708 is opened in the side wall of the sleeve body 791 and further communicates with the insertion hole 793 and the outer surface of the sleeve body 7911, so that the pipe 710 is fitted into the insertion hole 793 through the drain groove 708. With such a design, on the one hand, the drain sleeve 79 can be fitted into the pipe 710 through the drain groove 708, which facilitates the assembly of the drain sleeve 79 and the pipe 710, and on the other hand, the condensed water in the water collecting groove 794 can be discharged through the drain groove 708, which simplifies the structure of the drain sleeve 79. Here, the size of the drain groove 708 can be selectively set according to the number of condensed water, and is not specifically limited here.

[0297] Optionally, the flange 792 has an opening on one side where the drain groove 708 is located, so that the conduit 710 can enter the collection groove 794 through the opening. This allows for easy assembly of the drain sleeve 79.

[0298] As shown in Figures 46 and 50, the air conditioning system 1 further includes an electric control box 7. The electric control box 7 includes a box body 72. The radiator 6 is installed in the box body 72. Optionally, a drain hole 725 is installed in the box body 72, and a drain sleeve 79 is fitted in the drain hole 725. Condensed water in the electric control box 7 can be collected in the water collecting groove 794 of the drain sleeve 79, and discharged through the drain groove 708. In this way, it is not only convenient for the discharge of condensed water, but also the electric control box 7 can be sealed through the drain sleeve 79, thereby improving the reliability of the electric control box 7.

[0299] The sleeve body 791 and the flange 792 abut against the box body 72. The drain groove 708 and the opening of the flange 792 are located on the side where the sleeve body 791 and the flange 792 abut against the box body 72. As a result, the box body 72 blocks the drain groove 708 and the opening from the side of the drain sleeve 79. In this way, the sealing performance of the electric control box 7 can be improved, and the area of ​​the electric control box 7 communicating with the outside can be reduced.

[0300] In another embodiment, as shown in FIG. 49, this embodiment is different from the embodiment shown in FIG. 48 in that a plurality of ribs 796 may be installed inside the insertion hole 793. The plurality of ribs 796 are installed at intervals around the pipe 710 and abut against the pipe 710, so that a drain groove 709 is further formed between the ribs 796. The water collecting groove 794 is connected to the drain groove 709, and the condensed water collected in the water collecting groove 794 can be discharged through the drain groove 709. In the embodiment shown in FIG. 49, the drain groove 708 and the drain groove 709 are simultaneously installed in the drain sleeve 79, which is advantageous for discharging the condensed water in the water collecting groove 794 and prevents the condensed water in the water collecting groove 794 from overflowing. Here, the ribs 796 may be connected to the upper end surface and the lower end surface of the sleeve body 791. The number of the ribs 796 may be two, three, four, five, etc. The ribs 796 extend in the same direction as the conduits 710, facilitating the drainage of condensed water.

[0301] The ribs 796 may be integrally formed with the sleeve body 791. This facilitates processing and makes the structure of the drain sleeve 79 more reliable. In another embodiment, the ribs 796 may be bonded to the inner surface of the insertion hole 793. The number of ribs 796 may be selected and set according to the amount of condensed water to be actually discharged, and is not particularly limited in the present application.

[0302] In another embodiment, the drain sleeve 79 may only be provided with the drain groove 709, and may not be provided with the drain groove 708. In this way, the discharge of condensed water in the collecting groove 794 may be realized, and the structure of the drain sleeve 79 may be made simpler.

[0303] As shown in FIG. 49 , a fixing groove 797 may be further provided on the sleeve body 791. The fixing groove 797 is used to engage with the box body 72, thereby fixing the drain sleeve 79. Optionally, the fixing groove 797 may be provided on the side of the sleeve body 791 where the drain groove 708 is provided, thereby facilitating the installation of the drain sleeve 79. The fixing groove 797 can realize the fixing of the drain sleeve 79 and prevent the drain sleeve 79 from sliding in the pipe 710, and at the same time, the drain sleeve 79 can fix the pipe 710 and prevent the pipe 710 from tilting under the action of external force, thereby improving the reliability of the air conditioning system 1.

[0304] In the above embodiment, a drain sleeve 79 is fitted into the pipe 710 of the air conditioning system 1, which can drain the condensed water in the pipe 710, protect the pipe 710, and seal the electrical control box 7, thereby improving the reliability of the air conditioning system 1.

[0305] The structures in the above embodiments can be used in combination with each other, and as can be understood, the solutions in the above embodiments may use other types of heat sinks 6 in addition to the above heat sink 6, and the embodiments of the present application are not specifically limited.

[0306] The above is merely an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by utilizing the contents of the specification and drawings of the present application, or directly or indirectly applicable to other related technical fields, is similarly included in the scope of the claims of the present application.

Claims

1. A heat exchanger including at least four plates, a connecting piece, a first collecting pipe, and a second collecting pipe, The at least four plates are stacked and arranged, and a plurality of microchannels are arranged in each of the at least four plates; each of the plates includes a main body portion and a connecting portion, one end of the connecting portion is connected to the main body portion; at least two insertion holes are provided in the pipe walls of the first collecting pipe and the second collecting pipe, respectively; the other ends of the connecting portions of two of the at least four plate bodies are welded and fixed to the first collecting pipe through the insertion hole of the first collecting pipe, and the other ends of the connecting portions of two other plate bodies of the at least four plate bodies are welded and fixed to the second collecting pipe through the insertion hole of the second collecting pipe; the connecting portion of one of the other two plate bodies penetrates the first collecting pipe, and the connecting portion of the other of the other two plate bodies bypasses the first collecting pipe; A heat exchanger characterized in that the connection piece is sandwiched and installed between the main body portions of two adjacent plate bodies, solder is installed on both sides of the connection piece, and the connection piece is welded and fixed to the main body portions of the two plate bodies installed on both sides of the connection piece by the solder.

2. The heat exchanger according to claim 1, characterized in that the connection piece between two adjacent plates is a single-layer structure, or the connection piece between two adjacent plates is at least two layers, and the connection pieces of at least two layers are further fixed by welding with the solder.

3. 2. The heat exchanger according to claim 1, wherein the connecting piece has a melting point higher than a melting point of solder.

4. 4. The heat exchanger according to claim 3, wherein the connecting piece is a metal foil.

5. 5. The heat exchanger according to claim 4, wherein the connecting piece is made of aluminum foil or copper foil.

6. 2. The heat exchanger according to claim 1, wherein the thickness of the connecting piece is 0.9 mm to 1.2 mm.

7. A heat exchanger as described in claim 1, characterized in that the area covered by the solder applied to the connection piece of the plate bodies adjacent to both sides of the connection piece is 80% or more of the overlapping area of ​​the adjacent plate bodies.

8. 2. The heat exchanger of claim 1, wherein the at least four plates include a first plate and a second plate, the first plate defining a plurality of first microchannels for a first refrigerant stream flowing therethrough, and the second plate defining a plurality of first microchannels for a second refrigerant stream flowing therethrough, the second refrigerant stream absorbing heat from the first refrigerant stream to subcool the first refrigerant stream or the first refrigerant stream absorbing heat from the second refrigerant stream to subcool the second refrigerant stream.

9. A heat exchanger as described in claim 1, characterized in that the distance between two adjacent insertion holes is 2 mm or more.

10. providing at least four plates, each of the plates including a body portion and a connecting portion, one end of the connecting portion being connected to the body portion; providing a first collecting pipe and a second collecting pipe, the first collecting pipe and the second collecting pipe each having at least two insertion holes in their pipe walls; providing a connection piece and placing solder on both sides of the connection piece; The at least four plates are stacked and installed, and the connection piece is sandwiched between two adjacent plates; heating the at least four plates and the connection piece to weld and fix the connection piece and the two plates respectively installed on both sides of the connection piece by the solder; a step of welding and fixing the other ends of the connection portions of two of the at least four plate bodies to the first collecting pipe through the insertion holes of the first collecting pipe, and welding and fixing the other ends of the connection portions of two other plate bodies to the second collecting pipe through the insertion holes of the second collecting pipe, wherein the connection portion of one of the other two plate bodies passes through the first collecting pipe, and the connection portion of the other of the other two plate bodies bypasses the first collecting pipe; A method for manufacturing a heat exchanger, comprising:

11. An electric control box comprising a box body and a heat exchanger according to any one of claims 1 to 9, wherein the heat exchanger is connected to the electric control box and is used to dissipate heat from the electric control box.

12. An air conditioning system including a compressor, an outdoor heat exchanger, an indoor heat exchanger, and the heat exchanger according to any one of claims 1 to 9, wherein the compressor provides a circulating refrigerant flow between the outdoor heat exchanger and the indoor heat exchanger via a connecting pipe, and the heat exchanger is installed between the outdoor heat exchanger and the indoor heat exchanger and communicates with the connecting pipe.

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