A microchannel heat exchanger and heat pump system

Abstract

The present invention discloses a microchannel heat exchanger and a heat pump system, which relates to the technical field of heat pump systems, and solves the technical problem of uneven distribution of refrigerant entering the flat tube when the microchannel heat exchanger is used as an evaporator in the prior art. The microchannel heat exchanger of the present invention comprises a double header and an open-hole inner tube, wherein the open-hole inner tube passes through the double header and contacts the inner wall surface of the double header, and the open-hole inner tube is at least provided with an inner tube upper hole, an inner tube lower hole and an inner tube injection hole, and the refrigerant in the open-hole inner tube enters the double header through the inner tube upper hole and the inner tube injection hole and then mixes with the refrigerant entering the double header through the inner tube lower hole. In the microchannel heat exchanger and the heat pump system of the present invention, the refrigerant is evenly distributed in the cavity of the double header, so that the refrigerant can be evenly distributed in the flat tube, thereby improving the heat exchange performance of the microchannel heat exchanger.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump systems, and in particular to a microchannel heat exchanger and a heat pump system comprising the microchannel heat exchanger. Background Art

[0002] When the microchannel heat exchanger is used as an evaporator, the imported refrigerant is generally in a gas-liquid two-phase state. However, the manifold of the traditional microchannel heat exchanger has no diversion measures. After entering the manifold, the gas-liquid two-phase refrigerant is obviously stratified, resulting in uneven distribution of the refrigerant entering the flat tube, causing poor heat exchange performance of the heat exchanger.

[0003] Patent JPA2019074287 provides a double header for a microchannel heat exchanger, in which the inner tube and the outer tube are on the same axis, and the gas-liquid two-phase refrigerant enters the header from the bottom of the inner tube, and enters the inner cavity of the outer tube through the inner tube opening or gap of the double header to improve the uniformity of the refrigerant distribution. However, in the solution provided by the patent, there is still a situation where there is less refrigerant in the upper flat tube and more refrigerant in the lower flat tube, which is not conducive to improving the problem of uneven refrigerant distribution inside the cavity. The specific reasons are as follows: the gas-liquid two-phase refrigerant entering the cavity, the liquid phase refrigerant in which will drop under the action of gravity, resulting in less refrigerant in the upper space inside the cavity and more refrigerant in the lower space; correspondingly, less refrigerant enters the upper flat tube, and more refrigerant enters the lower flat tube.

[0004] Therefore, providing a heat exchanger that can evenly distribute the refrigerant in the flat tubes to improve the heat exchange performance of the heat exchanger has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] One of the purposes of the present invention is to provide a microchannel heat exchanger and a heat pump system, which solves the technical problem of uneven distribution of refrigerant entering the flat tube when the microchannel heat exchanger is used as an evaporator in the prior art. The many technical effects that can be produced by the preferred technical solution of the present invention are described in detail below.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The microchannel heat exchanger of the present invention comprises a double header and an open-hole inner tube, wherein the open-hole inner tube passes through the double header and contacts the inner wall surface of the double header, and the open-hole inner tube is at least provided with an inner tube upper hole, an inner tube lower hole and an inner tube injection hole, and the refrigerant in the open-hole inner tube enters the double header through the inner tube upper hole and the inner tube injection hole and then mixes with the refrigerant entering the double header through the inner tube lower hole.

[0008] According to a preferred embodiment, N spacer grooves are provided on the double collecting pipe, and the double collecting pipe is divided into N+1 chambers by spacers located on the spacer grooves, and N+1 open hole inner tubes respectively pass through the double collecting pipes of the N+1 chambers and contact with the inner wall surface of the double collecting pipe; wherein N is an integer greater than or equal to 1.

[0009] According to a preferred embodiment, the double collector includes a double collector outer tube and a double collector inner tube, the outer diameter of the double collector inner tube is smaller than the inner diameter of the double collector outer tube, and the double collector inner tube is located inside the double collector outer tube.

[0010] According to a preferred embodiment, the upper hole of the inner tube and the lower hole of the inner tube are respectively arranged on the upper and lower surfaces of the open-hole inner tube located in the inner tube cavity of the double-collecting pipe, and the inner tube injection hole is arranged on the upper surface of the open-hole inner tube located in the outer tube cavity of the double-collecting pipe, and the refrigerant in the open-hole inner tube enters the inner tube of the double-collecting pipe through the upper hole of the inner tube and the lower hole of the inner tube, and then enters the cavity of the outer tube of the double-collecting pipe through the inner tube of the double-collecting pipe.

[0011] According to a preferred embodiment, a first inner tube refrigerant port and a second inner tube refrigerant port are respectively provided on the wall surfaces at both ends of the inner tube of the double collecting tube in the N+1 chambers, so that the refrigerant can flow out of or enter the cavity of the inner tube of the double collecting tube through the first inner tube refrigerant port and the second inner tube refrigerant port.

[0012] According to a preferred embodiment, the outer diameter of the inner tube of the double header is greater than the outer diameter of the open hole inner insert tube.

[0013] According to a preferred embodiment, the diameter of the upper hole of the inner tube is larger than the diameter of the lower hole of the inner tube, and the diameter of the injection hole of the inner tube is 0.1-5 mm.

[0014] According to a preferred embodiment, the microchannel heat exchanger also includes flat tubes and an air tube header, and the double header and the air tube header are respectively provided with a first flat tube groove and a second flat tube groove, and the two ends of the flat tube are respectively inserted into the first flat tube groove and the second flat tube groove and are connected with the double header and the air tube header.

[0015] According to a preferred embodiment, the flat tube is inserted into the double current collecting tube to a depth not less than half of the inner diameter of the double current collecting tube cavity.

[0016] The heat pump system of the present invention comprises the microchannel heat exchanger described in any technical solution of the present invention.

[0017] The microchannel heat exchanger and heat pump system provided by the present invention have at least the following beneficial technical effects:

[0018] The microchannel heat exchanger of the present invention comprises a double header and an open-hole inner tube, wherein the open-hole inner tube is provided with at least an inner tube upper hole, an inner tube lower hole and an inner tube injection hole, so that the refrigerant entering the open-hole inner tube can be divided into three paths to enter the cavity of the double header, wherein two paths of refrigerant enter the cavity of the double header from upper and lower directions respectively through the inner tube upper hole and the inner tube lower hole, and the third path of refrigerant enters the cavity of the double header in a spraying manner through the inner tube injection hole. The three paths of refrigerant converge in the cavity of the double header, so that the refrigerant is evenly distributed in the cavity of the double header, so that the refrigerant can be evenly distributed in the flat tubes, thereby improving the heat exchange performance of the microchannel heat exchanger.

[0019] That is, in the microchannel heat exchanger of the present invention, the refrigerant enters the cavity of the double header through multiple paths and converges in the cavity of the double header, which can improve the problem of uneven refrigerant distribution in the cavity of the header in the prior art, and solves the technical problem of uneven distribution of refrigerant entering the flat tube when the microchannel heat exchanger in the prior art is used as an evaporator.

[0020] In addition, the preferred technical solution of the present invention also has the following beneficial technical effects:

[0021] The double manifold of the preferred technical solution of the present invention is provided with N spacer grooves, and the double manifold is divided into N+1 chambers by the spacers located on the spacer grooves, and N+1 open-hole inner tubes respectively pass through the double manifolds of the N+1 chambers and contact the inner wall surface of the double manifold, that is, the double manifold is divided into N+1 sections, and the refrigerant entering each chamber of the double manifold through the open-hole inner tube flows in each chamber, thereby shortening the descending distance of the liquid-phase refrigerant, reducing the influence of gravity on the liquid-phase refrigerant, avoiding the liquid-phase refrigerant from descending under the action of gravity and concentrating at the lower part of the double manifold, further improving the uniformity of the distribution of the refrigerant in the cavity of the double manifold, and further improving the heat exchange performance of the microchannel heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 is a schematic diagram of a preferred embodiment of the microchannel heat exchanger of the present invention;

[0024] Figure 2 It is a schematic diagram of a preferred embodiment of the double header and the open hole inner insert pipe of the present invention;

[0025] Figure 3 It is a front cross-sectional view of a preferred embodiment of the double header and the open hole inner insert of the present invention;

[0026] Figure 4 yes Figure 3 A partial enlarged view of the

[0027] Figure 5 It is a side cross-sectional view of a preferred embodiment of the double header and the open hole inner insert of the present invention;

[0028] Figure 6 is a cross-sectional view of a preferred embodiment of the perforated internal cannula of the present invention;

[0029] Figure 7 is a schematic diagram of a preferred embodiment of a heat pump system.

[0030] In the figure: 1. microchannel heat exchanger; 10. open-hole inner tube; 101. inner tube upper hole; 102. inner tube lower hole; 103. inner tube injection hole; 11. spacer groove; 12. double header outer tube; 13. double header inner tube; 131. first inner tube refrigerant port; 132. second inner tube refrigerant port; 14. flat tube; 15. air pipe header; 16. first flat tube groove; 17. air pipe inlet and outlet pipe; 2. four-way valve; 3. compressor; 4. heat exchanger; 5. throttling device; 6. diverter. DETAILED DESCRIPTION

[0031] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0032] The following is attached to the instruction manual Figures 1 to 7 And Examples 1 and 2 provide detailed descriptions of the microchannel heat exchanger and heat pump system of the present invention.

[0033] Example 1

[0034] This embodiment is combined with the specification Figures 1 to 6 The microchannel heat exchanger of the present invention is described in detail.

[0035] The microchannel heat exchanger 1 of this embodiment includes a double header and an open hole inner insert tube 10. Figures 1 to 5Preferably, the perforated inner tube 10 passes through the double header and contacts the inner wall surface of the double header, and the perforated inner tube 10 is provided with at least an inner tube upper hole 101, an inner tube lower hole 102 and an inner tube injection hole 103, and the refrigerant in the perforated inner tube 10 enters the double header through the inner tube upper hole 101 and the inner tube injection hole 103 and then mixes with the refrigerant entering the double header through the inner tube lower hole 102, as shown in FIG. Figure 3 Or as shown in 4 or 6.

[0036] In the microchannel heat exchanger 1 of the present embodiment, the perforated inner tube 10 is provided with at least an inner tube upper hole 101, an inner tube lower hole 102 and an inner tube injection hole 103, so that the refrigerant entering the perforated inner tube 10 can be divided into three paths to enter the cavity of the double manifold, wherein two paths of refrigerant enter the cavity of the double manifold from upper and lower directions through the inner tube upper hole 101 and the inner tube lower hole 102 respectively, and the third path of refrigerant enters the cavity of the double manifold in the form of a jet through the inner tube injection hole 103. The three paths of refrigerant converge in the cavity of the double manifold, so that the refrigerant is evenly distributed in the cavity of the double manifold, so that the refrigerant can be evenly distributed in the flat tube 14, thereby improving the heat exchange performance of the microchannel heat exchanger 1.

[0037] That is, in the microchannel heat exchanger 1 of this embodiment, the refrigerant enters the cavity of the double header through multiple paths and converges in the cavity of the double header, which can improve the problem of uneven refrigerant distribution in the cavity of the header in the prior art, and solves the technical problem of uneven distribution of refrigerant entering the flat tube 14 when the microchannel heat exchanger 1 in the prior art is used as an evaporator.

[0038] According to a preferred embodiment, N spacer grooves 11 are provided on the double header, and the double header is divided into N+1 chambers by the spacers located on the spacer grooves 11. N+1 open-hole inner inserts 10 respectively pass through the double headers of the N+1 chambers and contact the inner wall surface of the double header. Figures 1 to 5 As shown. Wherein, N is an integer greater than or equal to 1. Figures 1 to 5 As shown, two spacer grooves 11 are provided on the double header, which can separate the double header into three chambers, and an open hole inner tube 10 is inserted into each chamber. Preferably, the spacer is a structure with an open hole, so that each chamber can be connected. Preferably, the spacer may not be provided with an open hole, so that each chamber is completely isolated.

[0039] The preferred technical solution of this embodiment divides the double manifold into N+1 chambers through the partitions located on the partition grooves 11, that is, the double manifold is divided into N+1 sections, and the refrigerant entering each chamber of the double manifold through the opening inner tube 10 flows in each chamber, thereby shortening the descending distance of the liquid refrigerant, reducing the influence of gravity on the liquid refrigerant, avoiding the liquid refrigerant from descending under the action of gravity and concentrating in the lower part of the double manifold, further improving the uniformity of the distribution of the refrigerant in the cavity of the double manifold, thereby further improving the heat exchange performance of the microchannel heat exchanger 1.

[0040] According to a preferred embodiment, the double header includes a double header outer tube 12 and a double header inner tube 13, the outer diameter of the double header inner tube 13 is smaller than the inner diameter of the double header outer tube 12, and the double header inner tube 13 is located inside the double header outer tube 12, such as Figures 1 to 5 Preferably, the double header outer tube 12 and the double header inner tube 13 may be coaxial, or inscribed, or the inner surface of the double header outer tube 12 and the outer surface of the double header inner tube 13 may have a certain distance between them.

[0041] The double manifold of the preferred technical solution of this embodiment includes a double manifold outer tube 12 and a double manifold inner tube 13. The double manifold inner tube 13 is located inside the double manifold outer tube 12, so that the refrigerant can pass through the chamber of the double manifold inner tube 13 and then flow into the chamber of the double manifold outer tube 12, which is beneficial to the disturbance of the refrigerant in the double manifold, thereby facilitating the uniformity of the refrigerant diversion.

[0042] According to a preferred embodiment, the inner tube upper hole 101 and the inner tube lower hole 102 are respectively arranged on the upper and lower surfaces of the perforated inner tube 10 located in the cavity of the double header inner tube 13, and the inner tube injection hole 103 is arranged on the upper surface of the perforated inner tube 10 located in the cavity of the double header outer tube 12, and the refrigerant in the perforated inner tube 10 enters the double header inner tube 13 through the inner tube upper hole 101 and the inner tube lower hole 102, and then enters the cavity of the double header outer tube 12 through the double header inner tube 13, as shown in FIG. Figures 2 to 6 shown.

[0043] According to a preferred embodiment, the walls of the two ends of the double header inner tube 13 in the N+1 chambers are respectively provided with a first inner tube refrigerant port 131 and a second inner tube refrigerant port 132, so that the refrigerant flows out of or enters the cavity of the double header inner tube 13 through the first inner tube refrigerant port 131 and the second inner tube refrigerant port 132. Figures 3 to 5 shown.

[0044] See also Figure 4, the flow direction of the refrigerant in the double manifold is as follows: the refrigerant in the open hole inner tube 10 is divided into three paths and enters the cavity of the double manifold outer tube 12. Specifically, the first path of refrigerant enters the cavity of the double manifold inner tube 13 through the upper hole 101 of the inner tube, and flows upward through the first inner tube refrigerant port 131 to enter the cavity of the double manifold outer tube 12; the second path of refrigerant enters the cavity of the double manifold inner tube 13 through the lower hole 102 of the inner tube, and flows downward through the second inner tube refrigerant port 132 to enter the cavity of the double manifold outer tube 12; the third path of refrigerant enters the cavity of the double manifold outer tube 12 in the form of injection through the inner tube injection hole 103. Part of the first refrigerant and the third refrigerant is sucked into the flat tube 14 connected to the cavity of the double manifold outer tube 12, and the other part continues to flow downward under the action of gravity and mixes with the second refrigerant, thereby ensuring the uniformity of refrigerant distribution in the cavity of the double manifold outer tube 12.

[0045] According to a preferred embodiment, the outer diameter of the double header inner tube 13 is larger than the outer diameter of the perforated inner tube 10. The outer diameter of the double header inner tube 13 is larger than the outer diameter of the perforated inner tube 10, which ensures that the perforated inner tube 10 can pass through the double header inner tube 13.

[0046] According to a preferred embodiment, the aperture of the upper hole 101 of the inner tube is larger than the aperture of the lower hole 102 of the inner tube, and the aperture of the injection hole 103 of the inner tube is 0.1-5 mm. The aperture of the upper hole 101 of the inner tube in the preferred technical solution of this embodiment is larger than the aperture of the lower hole 102 of the inner tube, so that the refrigerant flowing upward is more than the refrigerant flowing downward. Even if the refrigerant falls to the lower part of the cavity due to gravity, it will not cause too much refrigerant to gather in the lower part of the cavity. The aperture of the injection hole 103 of the inner tube in the preferred technical solution of this embodiment is 0.1-5 mm. This aperture is relatively small. When the pressure in the tube of the perforated inner tube 10 is large enough, the refrigerant in the perforated inner tube 10 can be injected upward into the cavity of the outer tube 12 of the double manifold, which can further improve the uniformity of the refrigerant mixing in the cavity of the outer tube 12 of the double manifold.

[0047] According to a preferred embodiment, the microchannel heat exchanger 1 further includes a flat tube 14 and a gas pipe header 15. Figure 1 Preferably, the double header and the trachea header 15 are respectively provided with a first flat tube groove 16 and a second flat tube groove, and the two ends of the flat tube 14 are respectively inserted into the first flat tube groove 16 and the second flat tube groove and communicate with the double header and the trachea header 15, as shown in FIG. Figures 1 to 4As shown. Preferably, the depth of the flat tube 14 inserted into the double manifold is not less than half of the inner diameter of the double manifold cavity. More preferably, the depth of the flat tube 14 inserted into the double manifold is half of the outer tube 12 of the double manifold. The flat tube 14 of the preferred technical solution of this embodiment is located in the middle of the cavity of the outer tube 12 of the double manifold, which is beneficial to enhance the disturbance of the refrigerant in the cavity of the outer tube 12 of the double manifold, thereby facilitating the uniformity of the refrigerant diversion.

[0048] According to a preferred embodiment, the microchannel heat exchanger 1 further comprises an air inlet and outlet pipe 17, such as Figure 1 The air pipe inlet and outlet pipe 17 is disposed on the air pipe header 15 and communicated with the air pipe header 15 so that the gas phase refrigerant can flow out of or enter the cavity of the air pipe header 15 through the air pipe inlet and outlet pipe 17 .

[0049] Example 2

[0050] This embodiment is combined with the specification Figure 7 The heat pump system of the present invention will be described in detail.

[0051] The heat pump system of this embodiment includes the microchannel heat exchanger 1 of any technical solution in Example 1. The heat pump system of this embodiment also includes a four-way valve 2, a compressor 3, a heat exchanger 4, a throttling device 5 and a diverter 6. Figure 7 The heat pump system of this embodiment, because it has the microchannel heat exchanger 1 of any technical solution in Embodiment 1, can improve the heat exchange performance of the heat pump system.

[0052] When the microchannel heat exchanger 1 is used as a condenser, the a tube of the four-way valve 2 is connected to the b tube, and the c tube is connected to the d tube. The refrigerant discharged from the compressor 3 passes through the four-way valve 2 and enters the microchannel heat exchanger 1 for condensation and heat release, and then flows out through the double manifold on the right side in N+1 ways. After being merged by the diverter 6, it enters the throttling device 5 for throttling, and then enters the heat exchanger 4 for evaporation and heat absorption, and finally returns to the compressor 3 through the four-way valve 2 to complete the cycle.

[0053] When the microchannel heat exchanger 1 is used as an evaporator, the a tube and c tube of the four-way valve 2 are connected, and the b tube and d tube are connected. The refrigerant discharged from the compressor 3 passes through the four-way valve 2 and enters the heat exchanger 4 for condensation and heat release, and then enters the throttling device 5 for throttling, and then is split into N+1 paths through the splitter 6 to enter the microchannel heat exchanger 1 for evaporation and heat absorption, and then flows out from the outlet of the left gas pipe collecting pipe 15, and finally returns to the compressor 3 through the four-way valve 2 to complete the cycle.

[0054] In the description of the present invention, it should be noted that, unless otherwise specified, "multiple" means two or more than two; the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0055] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0056] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A microchannel heat exchanger, characterized in that: The invention comprises a double header and an open-hole inner tube (10), wherein the open-hole inner tube (10) passes through the double header and contacts the inner wall surface of the double header, and the open-hole inner tube (10) is provided with at least an inner tube upper hole (101), an inner tube lower hole (102) and an inner tube injection hole (103), and the refrigerant in the open-hole inner tube (10) enters the double header through the inner tube upper hole (101) and the inner tube injection hole (103) and then mixes with the refrigerant entering the double header through the inner tube lower hole (102); The double current collecting pipe comprises a double current collecting pipe outer pipe (12) and a double current collecting pipe inner pipe (13), the outer diameter of the double current collecting pipe inner pipe (13) is smaller than the inner diameter of the double current collecting pipe outer pipe (12), and the double current collecting pipe inner pipe (13) is located inside the double current collecting pipe outer pipe (12); The inner tube upper hole (101) and the inner tube lower hole (102) are respectively arranged on the upper and lower surfaces of the open-hole inner tube (10) located in the cavity of the double-collecting tube inner tube (13); the inner tube injection hole (103) is arranged on the upper surface of the open-hole inner tube (10) located in the cavity of the double-collecting tube outer tube (12), so that the refrigerant in the open-hole inner tube (10) enters the double-collecting tube inner tube (13) through the inner tube upper hole (101) and the inner tube lower hole (102), and then enters the cavity of the double-collecting tube outer tube (12) through the double-collecting tube inner tube (13).

2. The microchannel heat exchanger according to claim 1, characterized in that: The double current collecting pipe is provided with N spacer grooves (11), and the double current collecting pipe is divided into N+1 chambers by the spacers located on the spacer grooves (11), and N+1 open hole inner insert tubes (10) respectively pass through the double current collecting pipes of the N+1 chambers and contact the inner wall surface of the double current collecting pipe; Wherein, N is an integer greater than or equal to 1.

3. The microchannel heat exchanger according to claim 1, characterized in that: A first inner tube refrigerant port (131) and a second inner tube refrigerant port (132) are respectively provided on the wall surfaces at both ends of the double collecting tube inner tube (13) in the N+1 chambers, so that the refrigerant can flow out of or enter the cavity of the double collecting tube inner tube (13) through the first inner tube refrigerant port (131) and the second inner tube refrigerant port (132).

4. The microchannel heat exchanger according to claim 1, characterized in that: The outer diameter of the double header inner tube (13) is greater than the outer diameter of the open hole inner insert tube (10).

5. The microchannel heat exchanger according to claim 1, characterized in that: The diameter of the upper hole (101) of the inner tube is larger than the diameter of the lower hole (102) of the inner tube, and the diameter of the injection hole (103) of the inner tube is 0.1-5 mm.

6. The microchannel heat exchanger according to claim 1, characterized in that: It also includes a flat tube (14) and an air pipe header (15), wherein the double header and the air pipe header (15) are respectively provided with a first flat tube groove (16) and a second flat tube groove, and the two ends of the flat tube (14) are respectively inserted into the first flat tube groove (16) and the second flat tube groove and are in communication with the double header and the air pipe header (15).

7. The microchannel heat exchanger according to claim 6, characterized in that: The flat tube (14) is inserted into the double current collecting tube to a depth not less than half the inner diameter of the double current collecting tube cavity.

8. A heat pump system, characterized in that: A microchannel heat exchanger comprising any one of claims 1 to 7.

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