Liquid separation structure and coiled pipe micro-channel heat exchanger thereof

Abstract

The utility model relates to a liquid separation structure and a coiled pipe micro-channel heat exchanger thereof, the liquid separation structure comprises a liquid separation block, and the liquid separation block is provided with an inlet hole, a deep hole, a first cavity and a second cavity; the inlet hole is concentrically communicated with the deep hole; a through hole is formed in the position, close to the end, of the deep hole, a first connecting hole is formed in one side of the through hole, and the top area of the first connecting hole is connected with the first cavity. A second connecting hole is formed in the other side of the through hole, and the diameter of the second connecting hole is equal to that of the first connecting hole; the bottom area of the second connecting hole is connected with the second cavity; and one side, provided with the first cavity and the second cavity, of the liquid separation block is sealed by a first cover plate. According to the liquid separation structure and the coiled pipe micro-channel heat exchanger thereof, the space occupied by the collecting pipe is saved, so that the effective windward area is increased; the axial directions of the inlet pipe and the outlet pipe are perpendicular to the heat exchanger, space occupied by the inlet pipe and the outlet pipe in the width direction of the heat exchanger is saved, and heat exchange space is utilized to a greater extent.

Description

Technical Field

[0001] This utility model belongs to the field of refrigeration equipment technology, and relates to a liquid separation structure and its serpentine tube microchannel heat exchanger. Background Technology

[0002] Microchannel heat exchangers are high-efficiency, compact heat exchangers, mainly composed of flat tubes with multiple microchannels and manifolds for flow distribution and convergence. At the evaporator inlet, the refrigerant is typically in a gas-liquid two-phase state. When the liquid distribution in the microchannel heat exchanger is uneven, branches with less liquid will experience dry evaporation and superheating, while branches with more liquid will experience liquid carryover at the outlet, thus hindering the heat exchanger's capacity. To improve the performance of microchannel heat exchangers, a reasonable liquid distribution system is essential, and the design of the liquid distribution structure often needs to consider multiple factors such as complexity, manufacturing difficulty, and production cost.

[0003] Commonly used microchannel heat exchangers use flat tubes and manifolds assembled and welded together, with refrigerant distribution completed inside the manifolds. The manifolds occupy some space, reducing the actual usable airflow area; at the same time, a liquid distribution structure needs to be installed inside the manifolds, increasing the complexity of the manufacturing process. Summary of the Invention

[0004] To overcome the problems existing in the prior art, this utility model proposes a liquid-distributing structure and its serpentine tube microchannel heat exchanger, which saves the space occupied by the manifold to increase the effective windward area; the axial direction of the inlet and outlet pipes is perpendicular to the heat exchanger, saving the space occupied by the inlet and outlet pipes in the width direction of the heat exchanger and making greater use of the heat exchange space; the built-in liquid-distributing structure can achieve uniform distribution of refrigerant under different dryness and flow rates, and can be integrally formed by casting. After the heat exchanger is assembled, it can be integrally welded in a brazing furnace, effectively improving production efficiency.

[0005] The technical solution of this utility model to solve the above problems is:

[0006] On the one hand, this utility model proposes a liquid separation structure, the special feature of which is:

[0007] The device includes a liquid separator block, which has an inlet hole, a deep hole, a first cavity, and a second cavity. The first cavity and the second cavity are located on one side of the liquid separator block, arranged vertically and parallel to each other. The inlet hole and the deep hole are concentrically connected. The depth of the deep hole exceeds half the length of the liquid separator block, and the axis of the deep hole is located between the first cavity and the second cavity in the height direction of the liquid separator block. A through hole is provided near the end of the deep hole. The axis of the through hole is horizontal and located at the center of the liquid separator block. One side of the through hole is blocked by a first cover plate, and the other side is blocked by a plug. The diameter of the through hole is smaller than that of the deep hole. The axis of the through hole is perpendicular to the axis of the deep hole.

[0008] A first connecting hole is provided on one side of the through hole. The diameter of the first connecting hole is larger than that of the through hole, but their axes do not coincide. The top area of ​​the first connecting hole is connected to the first cavity. A second connecting hole is provided on the other side of the through hole. The diameter of the second connecting hole is equal to that of the first connecting hole. The axis of the second connecting hole does not coincide with that of the through hole. The bottom area of ​​the second connecting hole is connected to the second cavity. The side of the liquid separator block where the first cavity and the second cavity are located is sealed by a first cover plate. The first cover plate has a flat tube groove for inserting a flat tube at the location corresponding to the first cavity and the second cavity.

[0009] A further improvement of this utility model is that the liquid separating block is provided with four protrusions, which respectively cooperate with the four through holes on the first cover plate.

[0010] Secondly, this utility model also proposes another liquid separation structure, which is special in that:

[0011] The device includes a liquid separator block, which has an inlet hole, a deep hole, a first cavity, and a second cavity. The first cavity and the second cavity are located on one side of the liquid separator block, arranged vertically and parallel to each other. The inlet hole and the deep hole are concentrically connected. The depth of the deep hole exceeds half the length of the liquid separator block, and the axis of the deep hole is located in the middle of the first cavity and the second cavity in the height direction of the liquid separator block. A through hole is provided near the end of the deep hole, which enters the liquid separator block from the end away from the first cavity and the second cavity. The axis of the through hole is horizontal and located at the center of the liquid separator block. A first connecting hole is opened at the upper part of the through hole. The axis of the first connecting hole is perpendicular to and intersects the axis of the through hole. The first connecting hole passes through the first cavity and connects to the through hole. A second connecting hole is opened at the lower part of the through hole. The second connecting hole passes through the second cavity and connects to the through hole. The side of the liquid separator block with the first cavity and the second cavity is sealed by a first cover plate. The first cover plate has a flat tube groove for inserting a flat tube at the corresponding position of the first cavity and the second cavity.

[0012] A further improvement of this invention is that the connection ends of the first connecting hole, the second connecting hole, and the through hole to the outside of the liquid separator are each provided with a plug for sealing. The first connecting hole requires drilling through the top of the liquid separator when opening, hence the addition of a plug for sealing. The second connecting hole requires drilling through the bottom of the liquid separator when opening, hence the addition of a plug for sealing.

[0013] A further improvement of this utility model is that the liquid separating block is provided with four protrusions, which respectively cooperate with the four through holes on the first cover plate.

[0014] Thirdly, this utility model also proposes another liquid separation structure, characterized in that:

[0015] The device includes a liquid separator block, which has an inlet hole, a deep hole, a first cavity, and a second cavity. The first cavity and the second cavity are located on one side of the liquid separator block, arranged vertically and parallel to each other. The inlet hole and the deep hole are concentrically connected. The depth of the deep hole exceeds half the length of the liquid separator block, and the axis of the deep hole is located in the middle of the first cavity and the second cavity in the height direction of the liquid separator block. The liquid separator block has a first connecting hole and a second connecting hole respectively opened from opposite sides. The axes of the first connecting hole and the second connecting hole are arranged horizontally, and the two axes are parallel but do not coincide. The first connecting hole communicates with the first cavity, and the second connecting hole communicates with the second cavity. The ends of the first connecting hole and the second connecting hole are respectively opened with through holes, and the two through holes communicate with the deep hole respectively. The side of the liquid separator block with the first cavity and the second cavity is sealed by a first cover plate. The first cover plate has a flat tube groove for inserting a flat tube at the corresponding position of the first cavity and the second cavity.

[0016] A further improvement of this utility model is that the liquid separating block is provided with four protrusions, which respectively cooperate with the four through holes on the first cover plate.

[0017] Fourthly, this utility model also proposes a serpentine tube microchannel heat exchanger, characterized in that:

[0018] Includes any of the above-mentioned liquid separation structure, flat tube, first gas collecting block and second gas collecting block. In the liquid separation structure, the inlet hole of the liquid separation block is connected to the liquid inlet pipe. Two flat tube slots are respectively inserted into a serpentine flat tube. The flat tube is provided with a microchannel. The other ends of the two flat tubes are respectively connected to the first gas collecting block and the second gas collecting block.

[0019] A further improvement of this utility model is that a cavity is provided on one side of the first gas collecting block, the cavity is sealed by a cover plate, the cavity is connected to the air outlet, and a flat tube groove is provided on the cover plate; a cavity is provided on one side of the second gas collecting block, the cavity is sealed by a cover plate, the cavity is connected to the air outlet, and two flat tube grooves are provided on the cover plate.

[0020] A further improvement of this invention is that the flat tube is fixed and dissipates heat through fins.

[0021] Advantages of this utility model:

[0022] 1. The serpentine tube microchannel heat exchanger does not require the use of manifolds, saving the space occupied by manifolds and increasing the effective air-facing area, thereby improving the heat exchange capacity;

[0023] 2. The axial direction of the inlet and outlet pipes is perpendicular to the heat exchanger, which saves the space occupied by the inlet and outlet pipes in the width direction of the heat exchanger, thereby making greater use of the heat exchange space;

[0024] 3. The built-in one-to-two liquid distribution structure can evenly distribute the gas-liquid two-phase refrigerant entering from the inlet pipe into the two flat tubes; with the use of external distributors and modular design, it can be expanded in the height direction by series or parallel connection, so as to design microchannel heat exchangers of different sizes.

[0025] 4. The built-in liquid separation structure can be integrally formed by casting, and the heat exchanger can be integrally welded in a brazing furnace after assembly, which effectively improves production efficiency. Attached Figure Description

[0026] Figure 1 This is a structural diagram of a serpentine tube microchannel heat exchanger;

[0027] Figure 2 for Figure 1 Structural diagram of the first embodiment of the liquid separator;

[0028] Figure 3 for Figure 1 Structural diagrams of the first and second gas collecting blocks in the middle section;

[0029] Figure 4 This is a structural diagram of a second embodiment of the liquid separator;

[0030] Figure 5 This is a structural diagram of the third embodiment of the liquid separator.

[0031] The diagram shows: 1. Liquid inlet pipe; 2. Liquid distribution block; 3. Plug cap; 4. First cover plate; 5. Flat tube; 6. Fin; 7. First gas collecting block; 8. Third cover plate; 9. Gas outlet pipe; 10. Second gas collecting block; 11. Second cover plate; 201. Inlet hole; 202. Deep hole; 203. Through hole; 204. First connecting hole; 205. Second connecting hole; 206. First cavity; 207. Second cavity; 208. Protrusion; 401. Flat tube groove; 402. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model.

[0033] Example 1

[0034] See Figure 2A liquid separation structure includes a liquid separation block 2, wherein the liquid separation block 2 is provided with an inlet hole 201, a deep hole 202, a first cavity 206 and a second cavity 207.

[0035] The first cavity 206 and the second cavity 207 are disposed on one side of the liquid distribution block 2, and are arranged vertically and parallel to each other. The inlet hole 201 is concentrically connected to the deep hole 202, the depth of which exceeds half the length of the liquid distribution block 2, and the axis of the deep hole 202 is located between the first cavity 206 and the second cavity 207 in the height direction of the liquid distribution block 2. A through hole 203 is provided near the end of the deep hole 202. The axis of the through hole 203 is horizontal and located at the center of the liquid distribution block 2. One side of the through hole 203 is blocked by the first cover plate 4, and the other side is blocked by the plug cap 3. The diameter of the through hole 203 is smaller than that of the deep hole 202, and the axis of the through hole 203 is perpendicular to the axis of the deep hole 202.

[0036] A first connecting hole 204 is provided on one side of the through hole 203. The diameter of the first connecting hole 204 is larger than that of the through hole 203, but their axes do not coincide. The top area of ​​the first connecting hole 204 is connected to the first cavity 206. A second connecting hole 205 is provided on the other side of the through hole 203. The diameter of the second connecting hole 205 is equal to that of the first connecting hole 204. The axis of the second connecting hole 205 does not coincide with that of the through hole 203. The bottom area of ​​the second connecting hole 205 is connected to the second cavity 207.

[0037] The side of the liquid separator 2 with the first cavity 206 and the second cavity 207 is sealed by the first cover plate 4. The first cover plate 4 is provided with a flat tube groove 401 for inserting a flat tube at the location corresponding to the first cavity 206 and the second cavity 207.

[0038] Specifically, the liquid distribution block 2 is provided with four protrusions 208, which respectively cooperate with the four through holes 402 on the first cover plate 4, so that the first cover plate 4 is fixed on the liquid distribution block 2 and one side of the through hole 203 is blocked.

[0039] Example 2

[0040] See Figure 1 A serpentine tube microchannel heat exchanger includes the aforementioned liquid distribution structure, flat tubes 5, a first gas collecting block 7, and a second gas collecting block 10. In the liquid distribution structure, the inlet hole 201 of the liquid distribution block 2 is connected to the liquid inlet pipe 1. Two flat tube grooves 401 are respectively inserted into a serpentine flat tube 5, and microchannels are provided inside the flat tubes 5. The other ends of the two flat tubes 5 are respectively connected to the first gas collecting block 7 and the second gas collecting block 10. Each layer of flat tubes 5 is fixed and dissipates heat through fins 6.

[0041] See Figure 3The first gas collecting block 7 has a cavity on one side, which is sealed by a third cover plate 8. The cavity is connected to the air outlet, and the third cover plate 8 has a flat tube groove. The protrusion on the first gas collecting block 7 matches the through hole on the cover plate. The second gas collecting block 10 and the second cover plate 11 have similar structures and are used for the air outlet of a single flat tube. The second gas collecting block 10 has a cavity on one side, which is sealed by a second cover plate 11. The cavity is connected to the air outlet, and the second cover plate 11 has two flat tube grooves.

[0042] The refrigerant flow in the serpentine tube microchannel heat exchanger is as follows: See Figure 1 The gas-liquid two-phase refrigerant is first delivered to the heat exchanger through a main liquid pipe. Since each module corresponds to one inlet pipe 1, an external distributor is needed to distribute the refrigerant from the main liquid pipe to each inlet pipe 1. The main liquid pipe and the external distributor are common components and are not shown in the figure. The refrigerant enters the liquid distribution block 2 through the inlet pipe 1, where it is divided into two streams. Inside the liquid distribution block 2, the refrigerant flows sequentially through the inlet hole 201 and the deep hole 202. At the connection between the deep hole 202 and the through hole 203, it is divided into two fluid streams. One stream flows along the through hole 203, the first connecting hole 204, and the first cavity 206 to the upper half of the region, while the other stream flows along the through hole 203, the second connecting hole 205, and the second cavity 207 to the lower half of the region. The refrigerant then enters the microchannels of the flat tube 5 in the cavity and flows along the direction of the flat tube. When the refrigerant reaches the cavity of the first gas collection block 7 or the second gas collection block 10, it has already turned into a gaseous state and eventually leaves the heat exchanger through the outlet pipe 9.

[0043] The specific structure of the liquid separator 2 is that the refrigerant undergoes three 90° turns during flow: the first turn is from the deep hole 202 into the through hole 203; the second turn is through the first connecting hole 204 and the second connecting hole 205; and the third turn is through the first cavity 206 and the second cavity 207 into the flat tube. This design ensures that the axial direction of the liquid inlet pipe and the gas outlet pipe is perpendicular to the plane of the heat exchanger, thereby reducing the space occupied by the piping components in the width direction of the heat exchanger.

[0044] The key structural points that ensure the refrigerant is evenly distributed in the liquid distribution block are: the axis of the deep hole 202 is horizontal and perpendicular to the axis of the through hole 203; the axis of the through hole 203 is horizontal; and the flow channel structure that the refrigerant experiences when flowing from the inlet hole 201 into the first cavity 206 and into the second cavity 207 is completely symmetrical.

[0045] Expandability: When a large height dimension of the heat exchanger is required, it can be... Figure 1 The modules shown can be connected in series or in parallel along the height direction; when a larger width of the heat exchanger is required, a longer flat tube can be used.

[0046] Versatility: When it is necessary to change the width or thickness of the flat tube, only the size of the flat tube groove on the cover plate needs to be modified accordingly. The liquid separator and gas collector can be used as universal parts.

[0047] Example 3

[0048] This invention also proposes another liquid separation structure, see [link to related document]. Figure 4 The system includes a liquid distribution block 2, which has an inlet hole 201, a deep hole 202, a first cavity 206, and a second cavity 207. The first cavity 206 and the second cavity 207 are located on one side of the liquid distribution block 2, arranged vertically and parallel to each other. The inlet hole 201 and the deep hole 202 are concentrically connected. The depth of the deep hole 202 exceeds half the length of the liquid distribution block 2, and the axis of the deep hole 202 is located between the first cavity 206 and the second cavity 207 in the height direction of the liquid distribution block 2. A through hole 203 is provided near the end of the deep hole 202. The through hole 203 enters the liquid distribution block 2 from the end away from the first cavity 206 and the second cavity 207. The axis of the through hole 203 is horizontal and located at the center of the liquid distribution block 2. A first connecting hole 204 is provided at the upper part of the hole 203. The axis of the first connecting hole 204 is perpendicular to and intersects the axis of the through hole 203. The first connecting hole 204 passes through the first cavity 206 and connects to the through hole 203. A second connecting hole 205 is provided at the lower part of the through hole 203. The second connecting hole 205 passes through the second cavity 207 and connects to the through hole 203. The side of the liquid separator 2 where the first cavity 206 and the second cavity 207 are located is sealed by the first cover plate 4. The first cover plate 4 is provided with a flat tube groove 401 for inserting a flat tube at the corresponding positions of the first cavity 206 and the second cavity 207.

[0049] Specifically, the first connecting hole 204 requires drilling through the top of the liquid separator 2 when it is opened, so a plug cap 3 is added to seal it. The second connecting hole 205 requires drilling through the bottom of the liquid separator 2 when it is opened, so a plug cap 3 is added to seal it.

[0050] Specifically, the liquid distribution block 2 is provided with four protrusions 208, which respectively cooperate with the four through holes 402 on the first cover plate 4, so that the first cover plate 4 is fixed on the liquid distribution block 2, and one side of the first cavity 206 and the second cavity 207 is sealed.

[0051] Example 4

[0052] This invention also proposes another liquid separation structure, see [link to related document]. Figure 5The system includes a liquid distribution block 2, which has an inlet hole 201, a deep hole 202, a first cavity 206, and a second cavity 207. The first cavity 206 and the second cavity 207 are located on one side of the liquid distribution block 2, arranged vertically and parallel to each other. The inlet hole 201 and the deep hole 202 are concentrically connected. The depth of the deep hole 202 exceeds half the length of the liquid distribution block 2, and the axis of the deep hole 202 is located between the first cavity 206 and the second cavity 207 in the height direction of the liquid distribution block 2. The liquid distribution block 2 has a first connecting hole 204 and a second connecting hole 205 on opposite sides. The axes of the first connecting hole 204 and the second connecting hole 205 are horizontally arranged. The axes are parallel but not coincident; the first connecting hole 204 communicates with the first cavity 206, and the second connecting hole 205 communicates with the second cavity 207. The ends of the first connecting hole 204 and the second connecting hole 205 are respectively provided with through holes 203 concentrically, and the two through holes 203 are respectively communicated with the deep hole 202; the side of the liquid distribution block 2 where the first cavity 206 and the second cavity 207 are located is sealed by the first cover plate 4, and the first cover plate 4 is provided with a flat tube groove 401 for inserting a flat tube at the corresponding positions of the first cavity 206 and the second cavity 207.

[0053] Specifically, the liquid distribution block 2 is provided with four protrusions 208, which respectively cooperate with the four through holes 402 on the first cover plate 4, so that the first cover plate 4 is fixed on the liquid distribution block 2, and one side of the first cavity 206 and the second cavity 207 is sealed.

[0054] The above description is merely an embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related system fields, are similarly included within the scope of protection of this utility model.

Claims

1. A liquid separation structure, characterized in that: It includes a liquid distribution block (2), which is provided with an inlet hole (201), a deep hole (202), a first cavity (206) and a second cavity (207); The first cavity (206) and the second cavity (207) are located on one side of the liquid distribution block (2), arranged vertically and parallel to each other. The inlet hole (201) and the deep hole (202) are concentrically connected. The depth of the deep hole (202) exceeds half the length of the liquid distribution block (2). The axis of the deep hole (202) is located in the middle of the first cavity (206) and the second cavity (207) in the height direction of the liquid distribution block (2). A through hole (203) is provided near the end of the deep hole (202). The axis of the through hole (203) is horizontal and located at the center of the liquid distribution block (2). One side of the through hole (203) is blocked by the first cover plate (4), and the other side is blocked by the plug cap (3). The diameter of the through hole (203) is smaller than that of the deep hole (202). The axis of the through hole (203) is perpendicular to the axis of the deep hole (202). A first connecting hole (204) is provided on one side of the through hole (203). The diameter of the first connecting hole (204) is larger than that of the through hole (203), but their axes do not coincide. The top area of ​​the first connecting hole (204) is connected to the first cavity (206). A second connecting hole (205) is provided on the other side of the through hole (203). The diameter of the second connecting hole (205) is equal to that of the first connecting hole (204). The axis of the second connecting hole (205) does not coincide with that of the through hole (203). The bottom area of ​​the second connecting hole (205) is connected to the second cavity (207). The liquid separator (2) has a first cavity (206) and a second cavity (207) on one side sealed by a first cover plate (4). The first cover plate (4) has a flat tube groove (401) for inserting a flat tube at the location corresponding to the first cavity (206) and the second cavity (207).

2. The liquid separation structure according to claim 1, characterized in that: The liquid distribution block (2) has four protrusions (208) that respectively cooperate with the four through holes (402) on the first cover plate (4).

3. A liquid separation structure, characterized in that: It includes a liquid distribution block (2), which is provided with an inlet hole (201), a deep hole (202), a first cavity (206) and a second cavity (207); The first cavity (206) and the second cavity (207) are disposed on one side of the liquid distribution block (2), arranged vertically and parallel to each other. The inlet hole (201) and the deep hole (202) are concentrically connected. The depth of the deep hole (202) exceeds half the length of the liquid distribution block (2). The axis of the deep hole (202) is located in the middle of the first cavity (206) and the second cavity (207) in the height direction of the liquid distribution block (2). A through hole (203) is provided near the end of the deep hole (202). The through hole (203) enters the liquid distribution block (2) from the end away from the first cavity (206) and the second cavity (207). The axis of the through hole (203) is horizontal and located at the center of the liquid distribution block (2). A first connecting hole (204) is formed at the upper part of the through hole (203). The axis of the first connecting hole (204) is perpendicular to and intersects the axis of the through hole (203). The first connecting hole (204) passes through the first cavity (206) and connects to the through hole (203). A second connecting hole (205) is opened at the lower part of the through hole (203). The second connecting hole (205) passes through the second cavity (207) and connects to the through hole (203). The side of the liquid separator (2) with the first cavity (206) and the second cavity (207) is sealed by the first cover plate (4). The first cover plate (4) is provided with a flat tube groove (401) for inserting a flat tube at the location corresponding to the first cavity (206) and the second cavity (207).

4. The liquid separation structure according to claim 3, characterized in that: The first connecting hole (204), the second connecting hole (205) and the through hole (203) are respectively provided with plugs (3) to seal the connection ends with the outside of the liquid separator (2).

5. A liquid separation structure according to claim 4, characterized in that: The liquid distribution block (2) has four protrusions (208) that respectively cooperate with the four through holes (402) on the first cover plate (4).

6. A liquid separation structure, characterized in that: It includes a liquid distribution block (2), which is provided with an inlet hole (201), a deep hole (202), a first cavity (206) and a second cavity (207); The first cavity (206) and the second cavity (207) are disposed on one side of the liquid distribution block (2), and are arranged vertically and parallel to each other. The inlet hole (201) and the deep hole (202) are concentrically connected. The depth of the deep hole (202) exceeds half the length of the liquid distribution block (2), and the axis of the deep hole (202) is located in the middle of the first cavity (206) and the second cavity (207) in the height direction of the liquid distribution block (2). The liquid separator (2) has a first connecting hole (204) and a second connecting hole (205) respectively on opposite sides. The axes of the first connecting hole (204) and the second connecting hole (205) are set horizontally, and the two axes are parallel but do not coincide. The first connecting hole (204) is connected to the first cavity (206), and the second connecting hole (205) is connected to the second cavity (207). The ends of the first connecting hole (204) and the second connecting hole (205) are respectively provided with through holes (203), and the two through holes (203) are respectively connected to the deep hole (202). The liquid separator (2) has a first cavity (206) and a second cavity (207) on one side sealed by a first cover plate (4). The first cover plate (4) has a flat tube groove (401) for inserting a flat tube at the location corresponding to the first cavity (206) and the second cavity (207).

7. A liquid separation structure according to claim 6, characterized in that: The liquid distribution block (2) has four protrusions (208) that respectively cooperate with the four through holes (402) on the first cover plate (4).

8. A serpentine tube microchannel heat exchanger, characterized in that: Includes a liquid separation structure as described in any one of claims 1-7, a flat tube (5), a first gas collecting block (7), and a second gas collecting block (10). In the liquid separation structure, the inlet hole (201) of the liquid separation block (2) is connected to the liquid inlet pipe (1), and two flat tube grooves (401) are respectively inserted into a serpentine flat tube (5). The flat tube (5) is provided with a microchannel, and the other ends of the two flat tubes (5) are respectively connected to the first gas collecting block (7) and the second gas collecting block (10).

9. A serpentine tube microchannel heat exchanger according to claim 8, characterized in that: The first gas collecting block (7) has a cavity on one side, which is sealed by a cover plate. The cavity is connected to the air outlet, and a flat tube groove is provided on the cover plate. The second gas collecting block (10) has a cavity on one side, which is sealed by a cover plate. The cavity is connected to the air outlet, and two flat tube grooves are provided on the cover plate.

10. A serpentine tube microchannel heat exchanger according to claim 8, characterized in that: The flat tube (5) is fixed and dissipates heat through fins (6).

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