Micro-channel heat exchanger and air conditioning system

Abstract

This application relates to the field of heat exchanger technology and discloses a microchannel heat exchanger, comprising: a first manifold, a second manifold, multiple flat tubes, a guide cavity, a baffle assembly, and a linkage assembly; the baffle assembly includes a first baffle and a second baffle, the second baffle dividing the first manifold into a first compartment and a second compartment, and the first and second baffles are linked together by the linkage assembly; when the refrigerant flow rate increases, the first baffle is pressurized and moves towards the second compartment, and drives the second baffle towards the first compartment through the linkage assembly; thereby increasing the flow area and reducing the flow velocity of the gaseous refrigerant, thus reducing the pressure loss generated in the latter half of the refrigerant flow path, thereby improving the performance of the microchannel heat exchanger. This application also discloses an air conditioning system.

Description

Technical Field

[0001] This application relates to the field of heat exchanger technology, such as a microchannel heat exchanger and an air conditioning system. Background Technology

[0002] Against the backdrop of energy consumption and air pollution, high-efficiency heat pump systems have received increasing attention. As a key component of heat pump systems, heat exchangers play a crucial role in improving system energy efficiency. Microchannel heat exchangers, due to their compact structure, high heat exchange efficiency, and low refrigerant charge requirements, have been widely used in the air conditioning field, and replacing conventional finned tube heat exchangers with microchannel heat exchangers has become a common trend.

[0003] The related technology discloses a microchannel heat exchanger, which consists of two liquid collecting tubes and multiple flat tubes connected together. During the flow of the refrigerant, the number of flat tubes corresponding to each process is fixed.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] When the refrigerant flow rate is increased to improve heat exchange capacity, a pressure drop will occur in the gaseous refrigerant region in the latter half of the refrigerant flow path due to the small size of the flat tube channel. Excessive pressure drop will raise the surface temperature of the heat exchanger, thereby reducing the latent heat of the heat exchanger. Thus, even if the refrigerant flow rate is increased, the heat exchange capacity will not be improved.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a microchannel heat exchanger and an air conditioning system, which solves the problem that the heat exchange capacity cannot be improved due to pressure drop when the refrigerant flow rate increases.

[0009] In some embodiments, the microchannel heat exchanger includes:

[0010] It is connected to the first manifold and the second manifold, and the plurality of flat pipes are arranged along the axial direction of the first manifold;

[0011] A guide cavity is disposed inside the first manifold, the extension direction of the cavity is parallel to the axial direction, and one end of the cavity is provided with an opening;

[0012] The partition assembly includes a first partition and a second partition; the first partition is built into the guide cavity and is movable along the extension direction; the second partition is sleeved on the outer wall of the guide cavity and is movable along the extension direction; and the second partition divides the first manifold into a first compartment and a second compartment, the first compartment having a refrigerant inlet, the second compartment having a refrigerant outlet, and the opening communicating with the first compartment;

[0013] The linkage component includes a linkage part, wherein the first partition is connected to the second partition through the linkage part; and when the refrigerant flow increases, the first partition is pressurized and moves toward the second compartment, and the linkage part drives the second partition to move toward the first compartment, and the moving distance of the second partition corresponds to at least one of the flat tubes, thereby reducing the pressure drop.

[0014] Optionally, the linkage is located in the second room, and the linkage includes:

[0015] The connecting rod has a lever fulcrum on its body;

[0016] The first connecting rod has its first end extending into the guide cavity and connected to the first partition plate, and its second end hinged to the first end of the connecting rod.

[0017] The second link has its first end connected to the second partition plate and its second end hinged to the second end of the connecting rod;

[0018] The pressure acting on the first partition is transmitted sequentially through the first connecting rod, the connecting rod, and the second connecting rod before acting on the second partition; when the refrigerant flow rate increases, the direction of the resultant force acting on the second partition is towards the first compartment.

[0019] Optionally, both the first connecting rod and the second connecting rod are parallel to the axial direction of the first manifold.

[0020] Optionally, the lever fulcrum is located near the second end of the connecting rod to increase the force transmitted through the first connecting rod to the second connecting rod.

[0021] Optionally, the first partition is perpendicular to the extending direction of the guide cavity.

[0022] Optionally, the surface of the first partition is adapted to the cross-section of the guide cavity so that the side of the first partition abuts against the inner wall of the guide cavity.

[0023] Optionally, the second partition is perpendicular to the extending direction of the guide cavity.

[0024] Optionally, the side of the second partition is attached to the inner wall of the first manifold.

[0025] Optionally, the linkage component further includes:

[0026] The stop is used to prevent the second partition from continuing to move toward the second compartment after it returns to its initial position from the moved position.

[0027] In some embodiments, the air conditioning system includes the microchannel heat exchanger described in any of the above embodiments.

[0028] The air conditioning system provided in this embodiment can achieve the following technical effects:

[0029] The first compartment corresponds to the first section of the flat tube, and the second compartment corresponds to the second section of the flat tube. Initially, when the refrigerant flows at a constant flow rate, the second baffle is in equilibrium and therefore does not move. As the refrigerant flow rate increases, the force on the first baffle increases, causing it to move towards the second compartment along the extension direction of the guide cavity. Simultaneously, the first and second baffles are linked by a linkage mechanism; when the first baffle moves towards the second compartment, it drives the second baffle towards the first compartment. Since the movement distance of the second baffle corresponds to at least one flat tube, the number of second-section flat tubes corresponding to the second compartment increases by at least one. This increases the flow area of ​​the gaseous refrigerant and reduces its velocity, thereby reducing the pressure loss in the latter half of the refrigerant flow path and improving the performance of the microchannel heat exchanger.

[0030] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0031] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0032] Figure 1 This is a schematic diagram of the structure of the microchannel heat exchanger provided in the embodiments of this disclosure;

[0033] Figure 2 This is a schematic diagram of the structure of the linkage component provided in the embodiments of this disclosure;

[0034] Figure 3 This is a schematic diagram of the force analysis of the second partition provided in an embodiment of this disclosure;

[0035] Figure 4 This is a schematic diagram showing the movement direction of the first and second baffles when the refrigerant flow rate increases, according to an embodiment of this disclosure.

[0036] Figure label:

[0037] 100: First manifold; 101: First compartment; 102: Refrigerant inlet; 103: Second compartment; 104: Refrigerant outlet; 110: Second manifold; 120: Flat tube; 130: Fin;

[0038] 200: Guide cavity; 210: First partition plate; 220: Second partition plate; 230: Connecting rod; 231: First connecting rod; 232: Second connecting rod; 233: Lever fulcrum; 240: Stop. Detailed Implementation

[0039] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0040] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0041] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0042] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0043] Unless otherwise stated, the term "multiple" means two or more.

[0044] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0045] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0047] Combination Figure 1-4 As shown, this embodiment of the present disclosure provides a microchannel heat exchanger, including a first manifold 100, a second manifold 110, a plurality of flat tubes 120, a guide cavity 200, a baffle assembly, and a linkage assembly. Each flat tube 120 has its two ends connected to the first manifold 100 and the second manifold 110, respectively, and the plurality of flat tubes 120 are arranged along the axial direction of the first manifold 100; the guide cavity 200 is disposed within the first manifold 100, its extension direction being parallel to the axial direction of the first manifold 100, and one end of its cavity having an opening; the baffle assembly includes a first baffle 210 and a second baffle 220; the first baffle 210 is built into the guide cavity 200 and is movable along the extension direction of the guide cavity 200; the second baffle 220 is sleeved on the outer wall of the guide cavity 200 and is movable along the extension direction of the guide cavity 200; and the second… The partition 220 divides the first manifold 100 into a first compartment 101 and a second compartment 103. The first compartment 101 is provided with a refrigerant inlet 102, and the second compartment 103 is provided with a refrigerant outlet 104, with the opening connected to the first compartment 101. The linkage component includes a linkage part, and the first partition 210 is connected to the second partition 220 through the linkage part. When the refrigerant flow rate increases, the first partition 210 is pressurized and moves toward the second compartment 103. The linkage part drives the second partition 220 to move toward the first compartment 101, and the movement distance of the second partition 220 corresponds to at least one flat pipe 120, thereby reducing the pressure drop.

[0048] In this embodiment, as Figure 1As shown, the first manifold 100 and the second manifold 110 are arranged in parallel, and a plurality of flat tubes 120 are evenly arranged along the axial direction of the first manifold 100. The first end of each flat tube 120 is connected to the first manifold 100, and its second end is connected to the second manifold 110. The plurality of flat tubes 120 are parallel to each other, and a plurality of heat exchange fins 130 are provided on the outside of each flat tube 120 to improve the heat exchange effect. When the first manifold 100 and the second manifold 110 are placed vertically, the first chamber 101 is located below the second chamber 103. The first chamber 101 corresponds to the first portion of the flat tubes, and the second chamber 103 corresponds to the second portion of the flat tubes. The refrigerant flow path within the microchannel heat exchanger is as follows: liquid refrigerant enters the first chamber 101 from the refrigerant inlet 102. The refrigerant in the first chamber 101 flows through the first section of flat tubes to the second manifold 110. The refrigerant in the second manifold 110 flows through the second section of flat tubes to the second chamber 103, thus undergoing heat exchange as it flows through the flat tubes 120. Finally, the refrigerant that has undergone heat exchange and vaporized in the second chamber 103 flows out from the refrigerant outlet 104. Here, the first chamber 101 can be considered a liquid collection area, and the second chamber 103 can be considered a gas collection area. A pressure drop occurs during the refrigerant flow within the microchannel heat exchanger, which is mainly related to the refrigerant velocity. Since the velocity of the gaseous refrigerant is greater than that of the liquid refrigerant, the pressure drop is mainly generated in the latter half of the refrigerant flow path, i.e., the pressure drop mainly occurs in the second section of flat tubes and the second chamber 103.

[0049] Using the microchannel heat exchanger provided in this embodiment, the first chamber 101 corresponds to the first portion of the flat tube, and the second chamber 103 corresponds to the second portion of the flat tube. In the initial state, when the refrigerant flows at a constant flow rate, the second partition 220 is in equilibrium and therefore does not move. When the refrigerant flow rate increases, the pressure in both the first chamber 101 and the second chamber 103 increases. However, due to the pressure drop in the second chamber 103 and the second portion of the flat tube, the increase in pressure in the second chamber 103 is less than the increase in pressure in the first chamber 101. At this time, the first partition 210 experiences increased force and moves towards the second chamber 103 along the extension direction of the guide cavity 200. Simultaneously, the first partition 210 and the second partition 220 are linked by a linkage; when the first partition 210 moves towards the second chamber 103, it drives the second partition 220 to move towards the first chamber 101. Since the movement distance of the second partition 220 corresponds to at least one flat tube 120, the number of flat tubes in the second part corresponding to the second chamber 103 increases by at least one, thereby increasing the flow area and reducing the flow velocity of the gaseous refrigerant, which in turn reduces the pressure loss generated in the latter half of the refrigerant flow path, thereby improving the performance of the microchannel heat exchanger.

[0050] Optionally, such as Figure 2As shown, the linkage is located in the second compartment 103, and includes a connecting rod 230, a first connecting rod 231, and a second connecting rod 232. The connecting rod 230 has a lever fulcrum 233. The first end of the first connecting rod 231 extends into the guide cavity 200 and is connected to the first partition 210, while its second end is hinged to the first end of the connecting rod 230. The first end of the second connecting rod 232 is connected to the second partition 220, and its second end is hinged to the second end of the connecting rod 230. The pressure acting on the first partition 210 is transmitted sequentially through the first connecting rod 231, the connecting rod 230, and the second connecting rod 232 before acting on the second partition 220. When the refrigerant flow rate increases, the resultant force acting on the second partition 220 is directed towards the first compartment 101.

[0051] In this embodiment, the connecting rod 230, a first connecting rod 231, and a second connecting rod 232 form a hinged linkage mechanism, and the connecting rod 230 acts as a lever. Figure 3 To facilitate understanding of the forces acting on the second partition 220, the force exerted by the refrigerant in the first compartment 101 on the first partition 210 is denoted as F1, the force exerted by the refrigerant in the first compartment 101 on the second partition 220 is denoted as F2, and the force exerted by the refrigerant in the second compartment 103 on the second partition 220 is denoted as F3. The force exerted by F1 on the second partition 220 after being transmitted sequentially through the first connecting rod 231, the connecting rod 230, and the second connecting rod 232 is denoted as F4. Initially, the refrigerant enters at a constant speed from the refrigerant inlet 102 and flows out from the refrigerant outlet 104. At this time, the second partition 220 reaches a state of force equilibrium in a very short time, i.e., F3 + F4 = F2. When the refrigerant flow rate increases, F1 increases. F1, through the connecting rod 230, increases F4, and under the action of the lever, F4 increases to the point that F3 + F4 > F2. Thus, the resultant force acting on the second partition 220 is directed towards the first compartment 101, causing the second partition 220 to move towards the first compartment 101. Figure 4 The moving directions of the first partition 210 and the second partition 220 are shown. Since the moving distance of the second partition 220 corresponds to at least one flat tube 120, the number of the second part of the flat tubes corresponding to the second chamber 103 increases by at least one. The flow area of ​​the second part of the flat tubes increases, thereby reducing the flow velocity of the gaseous refrigerant and thus reducing the pressure loss generated in the latter half of the refrigerant flow path, thereby improving the performance of the microchannel heat exchanger. While the pressure loss of the second chamber 103 decreases, under the action of the pressure difference between the two chambers, the second partition 220 reaches a new equilibrium at its moved position corresponding to the increased flow rate.

[0052] For example, the first manifold 100 and the second manifold 110 are arranged parallel and vertically, and eight flat tubes 120 are evenly distributed along the axial direction of the first manifold 100. In the initial state, when the second partition 220 is in its initial position, the first part of the flat tubes corresponding to the first compartment 101 has four tubes, and the second part of the flat tubes corresponding to the second compartment 103 has four tubes. The second part of the flat tubes can be regarded as the gaseous refrigerant flow area. When the refrigerant flow rate increases from the initial flow rate to the first flow rate, the first partition 210 is pressurized and moves towards the second compartment 103, and drives the second partition 220 to move towards the first compartment 101 through the linkage. The moving distance of the second partition 220 corresponds to one flat tube 120, that is, the number of second part flat tubes becomes five and the number of first part flat tubes becomes three, thus increasing the flow area of ​​the second part of the flat tubes by 25%. When the refrigerant flow rate increases from the first flow rate to the second flow rate, the first partition 210 moves towards the second compartment 103 again, and the linkage drives the second partition 220 to move towards the first compartment 101 again. The movement distance of the second partition 220 corresponds to two flat tubes 120 relative to its initial position; that is, the number of flat tubes in the second part becomes six, and the number of flat tubes in the first part becomes two, increasing the flow area of ​​the second part of the flat tubes by 50%.

[0053] Optionally, both the first link 231 and the second link 232 are parallel to the axial direction of the first manifold 100.

[0054] In this embodiment, both the first manifold 100 and the second manifold 110 are straight pipes, arranged parallel to each other and vertically. Both the first connecting rod 231 and the second connecting rod 232 are straight rods, with the first connecting rod 231 moving vertically and the second connecting rod 232 moving vertically.

[0055] Optionally, the lever fulcrum 233 is located near the second end of the connecting rod 230 to increase the force transmitted through the first connecting rod 231 to the second connecting rod 232.

[0056] In this embodiment, as Figure 3 As shown, the lever arm corresponding to F1 is denoted as L1, and the lever arm corresponding to F4 is denoted as L2. According to the torque formula, F1*L1=F4*L2. The lever fulcrum 233 is placed close to the second end of the connecting rod 230, i.e., L2<L1. When the cold flow rate increases, F1 increases, and through the lever action of the connecting rod 230, F4 increases. Using the above lever arm setting allows for a larger F4 given a fixed length of the connecting rod 230, making it easier to push the second partition 220 towards the first compartment 101.

[0057] Optionally, the first end of the first connecting rod 231 extends into the guide cavity 200 and is connected to the first partition plate 210, and its second end is hinged to the first ends of the two connecting rods 230, with the two connecting rods 230 located on opposite sides of the first connecting rod 231. A second connecting rod 232 is respectively provided on opposite sides of the second partition plate 220. The first end of each second connecting rod 232 is connected to the surface of the second partition plate 220, and its second end is hinged to the second end of the corresponding connecting rod 230. Furthermore, the lever fulcrum 233 of the two connecting rods 230 are positioned correspondingly, meaning the lever arms L1 and L2 of the two second connecting rods 232 are equal.

[0058] In this embodiment, two connecting rods 230, one first connecting rod 231, and two second connecting rods 232 form a symmetrical hinged linkage mechanism, with each connecting rod 230 acting as a lever. When the refrigerant flow rate increases, F1 increases, and the first partition 210 is pressed and moves towards the second compartment 103. The first partition 210 drives the first connecting rod 231 to move upward, and the first connecting rod 231, through the two connecting rods 230, drives the corresponding second connecting rod 232 to move downward. The two second connecting rods 232 act on both sides of the second partition 220 respectively, pushing the second partition 220 towards the first compartment 101. Thus, the symmetrical hinged linkage mechanism makes the force on the second partition 220 more uniform, thereby making the movement of the second partition 220 more stable.

[0059] Optionally, the first partition 210 is perpendicular to the extending direction of the guide cavity 200. Since the first partition 210 is built into the guide cavity 200, it is advantageous for the first partition 210 to move along the extending direction of the guide cavity 200 when the first partition 210 is perpendicular to the extending direction of the guide cavity 200.

[0060] Optionally, the surface of the first partition 210 is adapted to the cross-section of the guide cavity 200 so that the side of the first partition 210 abuts against the inner wall of the guide cavity 200. In this way, the inner wall of the guide cavity 200 provides a guiding effect to the first partition 210, causing the first partition 210 to move along the extension direction of the guide cavity 200.

[0061] For example, the cross-section of the guide cavity 200 is constructed to be circular, and the second partition 220 is constructed as a corresponding circular plate. The area ratio of the first partition 210 and the second partition 220 is selected according to the inner diameter of the first manifold 100. The pressure of the first chamber 101 is denoted as P1, the area of ​​the first partition 210 is denoted as S1, and the area of ​​the second partition 220 is denoted as S2. Thus, the force on the first partition 210 is F1 = P1 * S1, the force on the second partition 220 is F2 = P1 * S2, and F4 = (P1 * S1 * L1) / L2. Since the condition for the second partition 220 to move toward the first chamber 101 is F3 + F4 > F2, that is,

[0062] (P1*S1*L1) / L2+F3>P1*S2

[0063] It can be seen that choosing a suitable area ratio between the first partition 210 and the second partition 220 is beneficial for the first partition 210 to push the second partition 220 towards the first compartment 101 more easily through the linkage.

[0064] Optionally, the second partition 220 is perpendicular to the extending direction of the guide cavity 200. Since the second partition 220 is sleeved on the outer wall of the guide cavity 200, it is advantageous for the second partition 220 to move along the extending direction of the guide cavity 200 when the second partition 220 is perpendicular to the extending direction of the guide cavity 200. Figures 1 to 4 The figure shown represents a portion of the length of the guide cavity 200.

[0065] Optionally, the side of the second partition 220 is attached to the inner wall of the first manifold 100. This is beneficial to the sealing of the first compartment 101 and the second compartment 103.

[0066] Optionally, the linkage assembly also includes a stop 240 to prevent the second partition 220 from continuing to move toward the second compartment 103 after returning to its initial position from its moved position.

[0067] In this embodiment, the linkage includes one or more stop plates, which are disposed on the outer side wall of the guide cavity 200 or the inner side wall of the first manifold 100. When there are multiple stop plates, their positions correspond to each other. The stop portion 240 can prevent excessive movement of the moved second partition 220 when it returns to its initial position, thereby reducing the number of second-part flat tubes corresponding to the second compartment 103.

[0068] For example, when the second partition 220 is in its initial position, the first compartment 101 corresponds to 4 first-part flat tubes, and the second compartment 103 corresponds to 4 second-part flat tubes, with the stop portion 240 corresponding to this initial position. If the position of the second partition 220 after movement corresponds to 6 second-part flat tubes, when the second partition 220 moves from the moved position back to the initial position, it interferes with the stop portion 240, preventing the second partition 220 from continuing to move into the second compartment 103. This ensures that the second compartment 103 corresponds to at least 4 flat tubes 120, satisfying the flow requirements of the gaseous refrigerant.

[0069] This disclosure also provides an air conditioning system including the microchannel heat exchanger described in any of the above embodiments.

[0070] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A microchannel heat exchanger, characterized in that, include: A first manifold (100), a second manifold (110), and a plurality of flat tubes (120); wherein, both ends of each of the flat tubes (120) are connected to the first manifold (100) and the second manifold (110), and the plurality of flat tubes (120) are arranged along the axial direction of the first manifold (100); A guide cavity (200) is disposed in the first manifold (100), the extension direction of the cavity is parallel to the axial direction, and one end of the cavity is provided with an opening; The partition assembly includes a first partition (210) and a second partition (220); the first partition (210) is built into the guide cavity (200) and is movable along the extension direction; the second partition (220) is sleeved on the outer wall of the guide cavity (200) and is movable along the extension direction; and the second partition (220) divides the first manifold (100) into a first compartment (101) and a second compartment (103), the first compartment (101) is provided with a refrigerant inlet (102), the second compartment (103) is provided with a refrigerant outlet (104), and the opening communicates with the first compartment (101); The linkage component includes a linkage part, wherein the first partition (210) is connected to the second partition (220) through the linkage part; and when the refrigerant flow increases, the first partition (210) is pressurized and moves toward the second compartment (103), and the second partition (220) is moved toward the first compartment (101) through the linkage part, and the moving distance of the second partition (220) corresponds to at least one of the flat tubes (120), thereby reducing the pressure drop.

2. The microchannel heat exchanger according to claim 1, characterized in that, The linkage unit is located in the second compartment (103), and the linkage unit includes: The connecting rod (230) has a lever fulcrum (233) on its body; The first connecting rod (231) has its first end extending into the guide cavity (200) and connected to the first partition plate (210), and its second end hinged to the first end of the connecting rod (230); The second link (232) has its first end connected to the second partition (220) and its second end hinged to the second end of the connecting rod (230); The pressure acting on the first partition (210) is transmitted sequentially through the first connecting rod (231), the connecting rod (230), and the second connecting rod (232) and then acts on the second partition (220); when the refrigerant flow rate increases, the direction of the resultant force acting on the second partition (220) is toward the first compartment (101).

3. The microchannel heat exchanger according to claim 2, characterized in that, Both the first connecting rod (231) and the second connecting rod (232) are parallel to the axial direction of the first manifold (100).

4. The microchannel heat exchanger according to claim 2 or 3, characterized in that, The lever fulcrum (233) is located near the second end of the connecting rod (230) to increase the force transmitted through the first connecting rod (231) to the second connecting rod (232).

5. The microchannel heat exchanger according to any one of claims 1 to 3, characterized in that, The first partition (210) is perpendicular to the extension direction of the guide cavity (200).

6. The microchannel heat exchanger according to claim 5, characterized in that, The surface of the first partition (210) is adapted to the cross-section of the guide cavity (200) so that the side of the first partition (210) abuts against the inner wall of the guide cavity (200).

7. The microchannel heat exchanger according to any one of claims 1 to 3, characterized in that, The second partition (220) is perpendicular to the extending direction of the guide cavity (200).

8. The microchannel heat exchanger according to claim 7, characterized in that, The side of the second partition (220) is attached to the inner wall of the first manifold (100).

9. The microchannel heat exchanger according to any one of claims 1 to 3, characterized in that, The linkage component also includes: The stop (240) is used to prevent the second partition (220) from continuing to move toward the second compartment (103) after it returns to its initial position from the moved position.

10. An air conditioning system, characterized in that, Includes the microchannel heat exchanger as described in any one of claims 1 to 9.

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