Micro-channel heat exchanger and control method thereof

Abstract

The application discloses a kind of micro-channel heat exchanger and its control method, including shell, flow guide plate one, flow guide plate two and microchannel flat tube, the both ends of the shell are provided with end cap, each microchannel flat tube is installed in shell and the two ends of microchannel flat tube respectively from two end caps stretch out;Flow guide plate one, flow guide plate two are respectively stacked and fixedly connected to the outside of two end caps, flow guide plate one includes the flow guide part one and flow guide part two distributed along the width direction of microchannel flat tube, flow guide part one and flow guide part two are respectively provided with flow guide groove one and flow guide groove two towards the side of shell, flow guide plate two includes the flow guide part three and flow guide part four distributed along the width direction of microchannel flat tube, flow guide part three and flow guide part four are respectively provided with flow guide groove three and flow guide groove four towards the side of shell.The application proposes microchannel heat exchanger, can satisfy the heat exchange requirement of new energy automobile.

Description

Technical Field

[0001] This invention relates to heat exchangers, and more specifically, to a microchannel heat exchanger, and also to a control method for a microchannel heat exchanger. Background Technology

[0002] In the thermal management system of new energy vehicles, the refrigeration system is needed to cool down the various modules of the vehicle. The core component is to achieve heat exchange between the refrigerant and the cooling water through the evaporator: the refrigerant undergoes a phase change and absorbs heat in the evaporator, thereby taking away the heat from the cooling water and completing the cooling of the cooling water.

[0003] Considering the impact of size and lightweight design, vehicle-mounted heat exchange equipment has high requirements for heat exchange uniformity and efficiency. Traditional plate heat exchangers have poor refrigerant distribution uniformity, resulting in insufficient refrigerant heat exchange, which affects the heat exchange effect and the overall heat exchange efficiency of the heat exchanger.

[0004] Therefore, a new heat exchanger technology solution is needed to meet the requirements of heat exchangers for new energy vehicles. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a microchannel heat exchanger and its control method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a microchannel heat exchanger, comprising a shell, a first guide plate, a second guide plate, and microchannel flat tubes, wherein end caps are provided at both ends of the shell, and each microchannel flat tube is installed inside the shell with its two ends extending from the two end caps respectively; the first guide plate and the second guide plate are stacked and fixedly connected to the outside of the two end caps respectively;

[0007] The flow guide plate includes a flow guide section 1 and a flow guide section 2 distributed along the width direction of the microchannel flat tube. The flow guide section 1 and the flow guide section 2 are respectively provided with a flow guide groove 1 and a flow guide groove 2 on the side facing the shell.

[0008] The second guide plate includes a guide section three and a guide section four distributed along the width direction of the microchannel flat tube. The guide section three and the guide section four are respectively provided with a guide groove three and a guide groove four on the side facing the shell.

[0009] The microchannel flat tube has several microchannels, each microchannel being opened along the length direction of the microchannel flat tube and arranged parallel to each other along the width direction of the microchannel flat tube;

[0010] Each microchannel is divided into several parts. The two ends of the first part of the microchannel are connected to the first guide channel and the fourth guide channel, respectively. The two ends of the second part of the microchannel are connected to the second guide channel and the third guide channel, respectively. The two ends of the third part of the microchannel are connected to the second guide channel and the fourth guide channel, respectively.

[0011] The present invention is further configured such that, in the same microchannel flat tube, the number of microchannels in the first part, the second part, and the third part increases sequentially.

[0012] The present invention is further configured such that a plurality of microchannel flat tubes are provided, and each microchannel flat tube is stacked and arranged at intervals along the thickness direction.

[0013] The present invention is further configured such that the shell is provided with two heat exchange interfaces, which are located on both sides of the microchannel flat tube in the width direction and at both ends in the length direction.

[0014] The present invention is further configured such that, along the thickness direction of the microchannel flat tube, both the first and second guide grooves are provided with a plurality of them, the same first guide groove connects the microchannels of the first part of the plurality of microchannel flat tubes, and the second guide groove corresponds one-to-one with each microchannel flat tube;

[0015] The flow guide plate is integrally connected to a partition section on the side facing the shell. The partition section separates the flow guide channel 1 and the flow guide channel 2 on both sides. The partition section 1 has several clearance notches. The ends of each microchannel flat tube are respectively embedded in the clearance notches and welded to seal.

[0016] The present invention is further configured such that, along the thickness direction of the microchannel flat tube, both the third and fourth guide grooves are provided with a plurality of them, and the same guide groove four connects the microchannels of the third part of a plurality of microchannel flat tubes, and the guide groove three corresponds one-to-one with each microchannel flat tube;

[0017] The guide plate 2 is integrally connected to the side of the shell facing the housing with the partition part 2, which separates the guide channel 3 and the guide channel 4 on both sides; the partition part 2 has a number of clearance notches 2, and the ends of each microchannel flat tube are respectively embedded in the clearance notches 2 and welded and sealed.

[0018] The adjacent guide channels four are separated by a partition three, and the partition three has a guide notch that connects the adjacent guide channels four.

[0019] The present invention is further configured such that a flow channel is provided on the side of the flow guide plate facing away from the shell, and a through hole is provided on the flow guide plate to connect the flow guide groove and the flow channel;

[0020] It also includes a cover plate, which is stacked and fixed on the side of the guide plate facing away from the housing, and can seal and cover the guide channel. The cover plate has a refrigerant interface that connects to the guide channel.

[0021] The present invention is further configured such that the four guide grooves extend to the side of the two guide plates facing away from the housing;

[0022] It also includes a second cover plate, which is stacked and fixed on the side of the guide plate two facing away from the shell, and can seal and cover the guide groove four. The second cover plate has a refrigerant interface two that communicates with the guide groove four.

[0023] The present invention is further configured such that the second guide channel extends to the side of the first guide plate facing away from the housing, and the first cover plate seals and covers the second guide channel; the third guide channel extends to the side of the second guide plate facing away from the housing, and the second cover plate seals and covers the third guide channel.

[0024] The present invention also provides a control method for a microchannel heat exchanger, which employs the microchannel heat exchanger as described above; refrigerant is circulated into the microchannel flat tube, and coolant is introduced between the inner cavity of the shell and the microchannel flat tube. Through heat exchange between the refrigerant and the coolant, the refrigerant can remove the heat from the coolant and cool it down.

[0025] In summary, the present invention has the following beneficial effects:

[0026] By arranging microchannel flat tubes in the heat exchanger, and having multiple microchannels inside the microchannel flat tubes, the heat exchange area can be increased, thereby improving the heat exchange efficiency.

[0027] The flow path of the microchannels can be blocked and diverted by multiple microchannels within the microchannel flat tube and the flow-diverting and blocking effect of the two end guide plates. A notch is made in the separation section of the two guide plates, allowing the microchannel flat tube to be embedded. The connection is fixed by welding, ensuring a tight seal at the joint. The separation section also creates a separation along the width of the microchannel flat tube.

[0028] During the refrigerant flow process, it bends and flows along the first, second and third parts of the microchannel flat tube respectively, forming an S-shaped serpentine flow channel. This forms a reciprocating heat exchange channel composed of a single microchannel flat tube, which can extend the heat exchange path and improve the heat exchange efficiency of the entire heat exchanger. Attached Figure Description

[0029] Figure 1 This is a perspective view of a microchannel heat exchanger according to this embodiment;

[0030] Figure 2 This is a first-view perspective exploded view of a microchannel heat exchanger according to this embodiment;

[0031] Figure 3 This is a second-view perspective exploded view of a microchannel heat exchanger according to this embodiment;

[0032] Figure 4 This is an exploded perspective view of the casing of this embodiment;

[0033] Figure 5for Figure 2 Enlarged view of point A in the middle;

[0034] Figure 6 This is a schematic diagram of the structure of the first surface of the guide plate in this embodiment;

[0035] Figure 7 This is a schematic diagram of the second side of the guide plate in this embodiment;

[0036] Figure 8 This is a schematic diagram of the structure of the first surface of the guide plate 2 in this embodiment;

[0037] Figure 9 This is a schematic diagram of the second surface of the guide plate 2 in this embodiment;

[0038] Figure 10 This is a cross-sectional view of a microchannel heat exchanger according to this embodiment, used to show the flow direction of the refrigerant;

[0039] Figure 11 This is an exploded view of the cross-sectional state of a microchannel heat exchanger according to this embodiment.

[0040] Reference numerals: Shell 1; End cap 11; Through groove 111; Heat exchange interface 12; Interface groove 121; Raised cover plate 122; Microchannel flat tube 2; End 21; Microchannel 22; Flow guide plate 1 3; Flow guide section 1 31; Through hole 311; Flow guide channel 312; Starting end 3121; Flow guide groove 1 313; Flow guide section 2 32; Flow guide groove 2 321; Separator section 1 33; Relief notch 1 331; Cover plate 1 4; Refrigerant interface 1 41; Flow guide plate 2 5; Flow guide section 3 51; Flow guide groove 3 511; Flow guide section 4 52; Flow guide groove 4 521; Separator section 3 522; Flow guide notch 523; Separator section 2 53; Relief notch 2 531; Cover plate 2 6; Refrigerant interface 2 61. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] This embodiment discloses a microchannel heat exchanger, referring to... Figures 1-11 As shown, the components of the microchannel heat exchanger are made of aluminum metal and are welded together to form an integrated structure after production.

[0043] Reference Figures 2-5As shown, the microchannel heat exchanger in this embodiment includes a shell 1, a first guide plate 3, a second guide plate 5, and a microchannel flat tube 2. The shell 1 is a roughly rectangular cavity structure, which is assembled from several aluminum plates. End caps 11 are provided at both ends of the shell 1.

[0044] The microchannel flat tube 2 is a flat aluminum profile tube fitting, and a number of microchannels 22 are formed in the microchannel flat tube 2. The microchannel flat tube 2 has a length direction, a width direction and a thickness direction. The microchannels 22 are formed along the length direction of the microchannel flat tube 2, and the microchannels 22 are arranged in parallel along the width direction of the microchannel flat tube 2; the microchannel flat tubes 2 are stacked and spaced apart along the thickness direction of the microchannel flat tube 2.

[0045] Each microchannel flat tube 2 is installed inside the housing 1 and the two ends 21 of the microchannel flat tube 2 extend from the two end caps 11 respectively; holes adapted to the shape of the microchannel flat tube 2 are opened at the end caps 11, the microchannel flat tube 2 passes through the holes of the end caps 11 and is welded and sealed to keep the inside of the housing 1 in a closed state.

[0046] Several microchannel flat tubes 2 are installed inside the shell 1. During the heat exchange process, refrigerant is circulated into the microchannel flat tubes 2, and coolant is introduced between the inner cavity of the shell 1 and the microchannel flat tubes 2. Through heat exchange between the refrigerant and the coolant, the refrigerant can remove the heat from the coolant and cool it down.

[0047] The housing 1 is provided with two heat exchange ports 12, through which coolant flows within the housing 1. The two heat exchange ports 12 are located on both sides of the microchannel flat tube 2 in the width direction and at both ends in the length direction. Furthermore, to maintain uniform coolant flow, an interface groove 121 is formed in the housing 1, extending along the thickness direction of the microchannel flat tube 2 and reaching the outside of the housing 1. A raised cover plate 122 is installed at the interface groove 121 on the outside of the housing 1. The raised cover plate 122 is partially raised, allowing coolant to flow out between adjacent microchannel flat tubes 2, thus ensuring uniform flow between the microchannel flat tubes 2. The heat exchange ports 12 formed at the raised cover plate 122 allow for smooth coolant flow.

[0048] Reference Figure 2 , Figure 3 , Figures 6-9As shown, guide plate 3 and guide plate 5 are stacked and fixedly connected to the outside of the two end caps 11. Guide plate 3 includes guide section 31 and guide section 32 distributed along the width direction of the microchannel flat tube 2. Guide groove 313 and guide groove 322 are respectively provided on the side of guide section 31 and guide section 32 facing the housing 1. Guide groove 313 and guide groove 321 extend with a certain width in the width direction of the microchannel flat tube 2, and the width of guide groove 313 is smaller than the width of guide groove 321.

[0049] The flow guide plate 2 5 includes a flow guide section 3 51 and a flow guide section 4 52 distributed along the width direction of the microchannel flat tube 2. The flow guide section 3 51 and the flow guide section 4 52 are respectively provided with a flow guide groove 3 511 and a flow guide groove 4 521 on the side facing the housing 1. The flow guide groove 3 511 and the flow guide groove 4 521 extend with a certain width in the width direction of the microchannel flat tube 2, and the width of the flow guide groove 3 511 is smaller than the width of the flow guide groove 4 521.

[0050] Along the width direction of the microchannel flat tube 2, it can be divided into three parts. The first part of the microchannel 22 is connected to guide channel one 313 and guide channel four 521 at both ends, respectively. The second part of the microchannel 22 is connected to guide channel two 321 and guide channel three 511 at both ends, respectively. The third part of the microchannel 22 is connected to guide channel two 321 and guide channel four 521 at both ends, respectively. That is, guide channel one 313 and guide channel four 521 are completely misaligned; guide channel two 321 and guide channel three 511 are partially misaligned and partially overlapped, so that the second part of the microchannel 22 is connected to guide channel two 321 and guide channel three 511 at both ends.

[0051] During the refrigerant flow process, it bends and flows along the first, second and third parts of the microchannel flat tube 2 respectively, forming an S-shaped serpentine flow channel, which in turn forms a reciprocating heat exchange channel composed of a single microchannel flat tube 2.

[0052] Furthermore, the microchannel heat exchanger in this embodiment can be used as an evaporator. During the flow of the refrigerant within the microchannel flat tube 2, the refrigerant undergoes a phase change, transforming from a liquid state to a gaseous state, thus changing the volume of the refrigerant. Therefore, in this embodiment, for the same microchannel flat tube 2, the dimensions of the internal microchannels 22 are basically the same, and the number of microchannels 22 in the first part, the second part, and the third part increases sequentially to accommodate the phase change requirements of the refrigerant.

[0053] To improve the uniformity of refrigerant flow, several guide channels 313 and 321 are provided along the thickness direction of the microchannel flat tube 2. The thickness of guide channel 313 is greater than that of guide channel 321, while the width of guide channel 321 is greater than that of guide channel 313. The same guide channel 313 connects to the microchannels 22 of the first part of several microchannel flat tubes 2, typically connecting 2-3 sets of microchannels 22, thus relatively evenly distributing the refrigerant among the three microchannel flat tubes 2. Guide channels 321 correspond one-to-one with each microchannel flat tube 2, guiding the refrigerant along the width direction of the microchannel flat tube 2, allowing it to flow between the microchannels 22 of the second and third parts of the microchannel flat tube 2.

[0054] Along the thickness direction of the microchannel flat tube 2, several guide grooves 3 511 and 4 521 are provided. The width of guide groove 3 511 is greater than that of guide groove 4 521, and the thickness of guide groove 4 521 is greater than that of guide groove 3 511. The same guide groove 4 521 connects to the microchannels 22 of the third part of several microchannel flat tubes 2, typically connecting 2-3 sets of microchannels 22 in the third part, enabling the refrigerant to converge and circulate. Guide groove 3 511 corresponds one-to-one with each microchannel flat tube 2, guiding the refrigerant along the width direction of the microchannel flat tube 2, allowing it to flow between the microchannels 22 of the first and second parts of the microchannel flat tube 2.

[0055] Reference Figure 7 , Figure 8 As shown, a partition 33 is integrally connected to the side of the guide plate 3 facing the housing 1, separating the guide channel 313 and the guide channel 321 on both sides. Furthermore, several clearance notches 331 are provided in the partition 33, and the ends of each microchannel flat tube 2 are respectively embedded in the clearance notches 331. After being embedded in the clearance notches 331, the microchannel flat tube 2 is welded and sealed to the inner wall of the clearance notches 331, which not only provides positioning and support for the microchannel flat tube 2, but also separates the first and second parts of the microchannel flat tube 2 in the width direction.

[0056] A partition 2 53 is integrally connected to the side of the guide plate 2 5 facing the housing 1, separating the guide channel 3 511 and the guide channel 4 521 on both sides. The partition 2 53 has several clearance notches 2 531, and the ends of each microchannel flat tube 2 are respectively embedded in the clearance notches 2 531. After the microchannel flat tube 2 is embedded in the clearance notch 2 531, it is welded and sealed to the inner wall of the clearance notch 2 531, which can both position and support the microchannel flat tube 2, and separate the second and third parts of the microchannel flat tube 2 in the width direction.

[0057] In addition, to ensure smooth flow of refrigerant, a flow channel 312 is provided on the side of the guide plate 3 facing away from the housing 1. The guide plate 3 has a through hole 311 connecting the flow groove 313 and the flow channel 312. The flow channel 312 has a starting end 3121 and flows along the branch channel. It can enter from the starting end 3121, be divided by the flow channel 312, and flow relatively evenly into the through hole 311 and the flow groove 313, and then enter the microchannel 22 of the first part of the microchannel flat tube 2. For example, the flow channel 312 can be divided into two, four, or eight, forming eight flow paths in the main pipe, which can be specifically opened as needed.

[0058] Additionally, refer to Figure 2 , Figure 3 As shown, the microchannel heat exchanger in this embodiment also includes a cover plate 4, which is stacked and fixed on the side of the guide plate 3 facing away from the housing 1, and can seal and cover the guide channel 312. The cover plate 4 has a refrigerant interface 41 that communicates with the guide channel 312. The position of the refrigerant interface 41 is opposite to the starting end 3121 of the guide channel 312, so that refrigerant can be input from there, realizing the input and diversion of refrigerant.

[0059] Reference Figure 8 , Figure 9 As shown, adjacent flow channels 4 521 are separated by a partition 3 522, and the partition 3 522 has a flow guide notch 523 that connects the adjacent flow channels 4 521. The flow guide notch 523 can connect the flow channels 4 521 to each other, and can re-gather the refrigerant after it flows through the microchannel flat tube 2.

[0060] Additionally, refer to Figure 2 , Figure 3 As shown, the microchannel heat exchanger in this embodiment also includes a cover plate 2 6. A guide channel 4 521 extends to the side of the guide plate 2 5 facing away from the housing 1. The cover plate 2 6 is stacked and fixed to the side of the guide plate 2 5 facing away from the housing 1, and can seal the guide channel 4 521. Furthermore, a refrigerant interface 2 61 communicating with the guide channel 4 521 is provided on the cover plate 2 6. The cover plate 2 6 has a recessed guide groove, through which the refrigerant flowing out of the guide channel 4 521 can be returned and output from the refrigerant interface 2 61, forming a refrigerant return output.

[0061] Additionally, refer to Figure 2 , Figure 3 and Figures 6-9 As shown, in this embodiment, the second guide channel 321 extends to the side of the first guide plate 3 facing away from the housing 1, and the first cover plate 4 can seal and cover the second guide channel 321; the third guide channel 511 extends to the side of the second guide plate 5 facing away from the housing 1, and the second cover plate 6 can seal and cover the third guide channel 511.

[0062] In this embodiment, the various parts of the microchannel heat exchanger are fixed by welding, maintaining a sealed state at the joints. Specifically, a furnace welding process can be used. Before welding, the various parts of the microchannel heat exchanger are assembled and supported using tooling fixtures and kept in a fixed state. Then, they are heated and welded. The flux at the joints will melt, and after cooling, the various parts at the joints can be welded and fixed, maintaining a reliable seal.

[0063] This embodiment also discloses a control method for a microchannel heat exchanger, using the microchannel heat exchanger as described above, and referring to... Figure 10 , Figure 11 Please provide a detailed explanation.

[0064] During the circulation process, the refrigerant is introduced through refrigerant interface 41 and evenly distributed into each guide groove 313 via the guide channel 312 of guide plate 3. The refrigerant in the guide groove 313 then flows through the microchannel 22 of the first part of the microchannel flat tube 2 and into the guide groove 511 of guide plate 5. In the guide groove 511, the refrigerant flows along the width direction of the microchannel flat tube 2, from the microchannel 22 of the first part of the microchannel flat tube 2 to the microchannel 22 of the second part; then from the... The refrigerant flows from the two-part microchannel 22 towards the guide plate 3 and enters the guide groove 321 of the guide plate 3. In the guide groove 321, the refrigerant flows along the width of the microchannel flat tube 2 and flows from the microchannel 22 of the second part of the microchannel flat tube 2 to the microchannel 22 of the third part. It then flows from the microchannel 22 of the third part towards the guide plate 5 and enters the guide groove 521 of the guide plate 5. Finally, it flows out from the refrigerant interface 61 of the cover plate 6, thus realizing the circulation of refrigerant.

[0065] During the heat exchange process, the coolant to be cooled is introduced into the space between the inner wall of the shell 1 and the microchannel flat tube 2 through one of the heat exchange ports 12, and exchanges heat with the refrigerant in the microchannel flat tube 2. The refrigerant can carry away the heat of the coolant and cool it down. Then, the coolant is discharged from the other heat exchange port 12, realizing the circulation and cooling of the coolant.

[0066] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A microchannel heat exchanger, characterized in that, The device includes a housing (1), a first guide plate (3), a second guide plate (5), and a microchannel flat tube (2). Both ends of the housing (1) are provided with end caps (11). Each microchannel flat tube (2) is installed inside the housing (1), and the two ends (21) of the microchannel flat tube (2) extend out from the two end caps (11) respectively. The first guide plate (3) and the second guide plate (5) are stacked and fixedly connected to the outside of the two end caps (11). The first guide plate (3) includes a first guide section (31) and a second guide section (32) distributed along the width direction of the microchannel flat tube (2). The first guide section (31) and the second guide section (32) are respectively provided with a first guide groove (313) and a second guide groove (321) on the side facing the shell (1). The second guide plate (5) includes a third guide section (51) and a fourth guide section (52) distributed along the width direction of the microchannel flat tube (2). The third guide section (51) and the fourth guide section (52) are respectively provided with a third guide groove (511) and a fourth guide groove (521) on the side facing the shell (1). The microchannel flat tube (2) has several microchannels (22), each microchannel (22) is opened along the length direction of the microchannel flat tube (2) and is arranged in parallel along the width direction of the microchannel flat tube (2); Each microchannel (22) is divided into several parts. The two ends of the first part of the microchannel (22) are connected to the first guide channel (313) and the fourth guide channel (521) respectively. The two ends of the second part of the microchannel (22) are connected to the second guide channel (321) and the third guide channel (511) respectively. The two ends of the third part of the microchannel (22) are connected to the second guide channel (321) and the fourth guide channel (521) respectively.

2. A microchannel heat exchanger according to claim 1, characterized in that, In the same microchannel flat tube (2), the number of microchannels (22) in the first part, the second part, and the third part increases sequentially.

3. A microchannel heat exchanger according to claim 1, characterized in that, The microchannel flat tubes (2) are provided in several layers, and each microchannel flat tube (2) is stacked and spaced apart along the thickness direction.

4. A microchannel heat exchanger according to claim 3, characterized in that, The housing (1) is provided with two heat exchange ports (12), which are located on both sides of the width direction of the microchannel flat tube (2) and at both ends of the length direction.

5. A microchannel heat exchanger according to claim 3, characterized in that, Along the thickness direction of the microchannel flat tube (2), there are several flow guide grooves one (313) and two flow guide grooves two (321). The same flow guide groove one (313) connects the microchannels (22) of the first part of several microchannel flat tubes (2). The flow guide groove two (321) corresponds one-to-one with each microchannel flat tube (2). The flow guide plate (3) is integrally connected to the side of the housing (1) with a partition (33), which separates the flow guide groove (313) and the flow guide groove (321) on both sides; the partition (33) has a plurality of clearance notches (331), and the ends of each microchannel flat tube (2) are respectively embedded in the clearance notches (331) and welded and sealed.

6. A microchannel heat exchanger according to claim 5, characterized in that, Along the thickness direction of the microchannel flat tube (2), there are several flow guide grooves three (511) and four (521). The same flow guide groove four (521) connects to the microchannels (22) of the third part of several microchannel flat tubes (2). The flow guide groove three (511) corresponds one-to-one with each microchannel flat tube (2). The flow guide plate 2 (5) is integrally connected to the partition part 2 (53) on the side facing the shell (1). The partition part 2 (53) separates the flow guide groove 3 (511) and the flow guide groove 4 (521) on both sides. The partition part 2 (53) has a plurality of clearance notches 2 (531). The ends of each microchannel flat tube (2) are respectively embedded in the clearance notches 2 (531) and welded and sealed. The adjacent flow channels four (521) are separated by a partition three (522), and the partition three (522) has a flow channel notch (523) that connects the adjacent flow channels four (521).

7. A microchannel heat exchanger according to claim 1, characterized in that, The flow guide plate (3) has a flow guide channel (312) on the side facing away from the shell (1), and the flow guide plate (3) has a through hole (311) connecting the flow guide groove (313) and the flow guide channel (312); It also includes a cover plate (4), which is stacked and fixed on the side of the guide plate (3) facing away from the housing (1) and can seal the guide channel (312). The cover plate (4) has a refrigerant interface (41) that connects to the guide channel (312).

8. A microchannel heat exchanger according to claim 6, characterized in that, The fourth guide groove (521) extends to the side of the second guide plate (5) facing away from the shell (1); It also includes a cover plate two (6), which is stacked and fixed on the side of the guide plate two (5) facing away from the shell (1) and can seal and cover the guide groove four (521). The cover plate two (6) has a refrigerant interface two (61) that communicates with the guide groove four (521).

9. A microchannel heat exchanger according to claim 8, characterized in that, The second guide channel (321) extends to the side of the first guide plate (3) facing away from the housing (1), and the first cover plate (4) seals and covers the second guide channel (321); the third guide channel (511) extends to the side of the second guide plate (5) facing away from the housing (1), and the second cover plate (6) seals and covers the third guide channel (511).

10. A control method for a microchannel heat exchanger, characterized in that, The microchannel heat exchanger as described in any one of claims 1-9 is used; refrigerant is circulated into the microchannel flat tube (2), and coolant is introduced between the inner cavity of the shell (1) and the microchannel flat tube (2). Through heat exchange between the refrigerant and the coolant, the refrigerant can remove the heat of the coolant and cool it down.

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