Liquid separation structure and microchannel heat exchanger

Abstract

The present invention belongs to the field of refrigeration technology and equipment, and specifically relates to a diversion structure and a microchannel heat exchanger. The diversion structure includes an outer circular tube, and a plurality of diversion units are provided in the outer circular tube. Each diversion unit includes a middle sleeve and an inner circular tube. The outer circular tube, the middle sleeve and the inner circular tube are coaxially nested. An inlet hole and an outlet hole are provided on the side wall of the outer circular tube; the inlet hole is connected to the inlet tube, and a hollow groove is provided on the middle sleeve. The hollow groove cooperates with the inner wall of the outer circular tube and the outer wall of the inner circular tube to form a diversion groove. The outlet hole of the outer circular tube is connected to the manifold through a connecting clamp. The inside of the manifold is divided into several independent chambers by a partition, and one or more flat tubes are inserted in each chamber. The present invention uses hollow sleeves for nesting to form a liquid separation flow path, and utilizes a two-part structure and the arrangement of the flow path to make the local resistance effect, along-the-path resistance effect, and gravity effect of each branch the same, thereby achieving better liquid separation uniformity.

Description

Technical Field

[0001] The present invention belongs to the field of refrigeration technology and equipment, and particularly relates to a liquid separation structure and a microchannel heat exchanger. Background Art

[0002] A microchannel heat exchanger (MCHE) is a highly efficient and compact heat exchanger primarily composed of flat tubes with multiple microchannels and headers for diverting and converging flows. At the evaporator inlet, the refrigerant is typically in a two-phase gas-liquid state. When the MCH's liquid separation is uneven, branches with less liquid separation will experience dry evaporation and overheating, while branches with more liquid separation will experience liquid carryover at the outlet, hindering the MCH's heat transfer capacity. To improve the performance of MCHs, proper liquid separation is essential. The design of the liquid separation structure must consider multiple factors, including complexity, process difficulty, and production cost.

[0003] There are many improvements on the liquid separation structure of microchannel heat exchangers. Different structures have different characteristics and advantages and disadvantages. There are generally the following disadvantages:

[0004] 1. Traditional external distributors are mature in copper tube heat exchangers, but microchannel heat exchangers have a large number of flat tubes. The use of external distributors makes the structure complex and the cost high, which is not conducive to compressing space and forming an integrated liquid separation structure.

[0005] 2. Setting up a liquid separation structure inside the manifold of the microchannel heat exchanger facilitates integrated flow diversion, but the internal space of the manifold is small, and the complex liquid separation structure is difficult to apply due to process and cost issues.

[0006] 3. For the liquid separation structure in the manifold, the liquid separation uniformity of each branch is mainly affected by the local resistance, the resistance along the way, and the gravity. Theoretically, when the three effects of each branch are equal, completely uniform liquid separation can be achieved, but it is difficult to control the three effects to be exactly the same in the existing structure. Summary of the Invention

[0007] The present invention proposes a liquid separation structure and a microchannel heat exchanger, which mainly adopt hollow sleeves for nesting to form a liquid separation flow path. The two-branch structure and the arrangement of the flow path are utilized to make the local resistance effect, along-the-path resistance effect, and gravity effect of each branch the same, thereby achieving better liquid separation uniformity.

[0008] The technical solution of the present invention to solve the above problems is: a liquid separation structure, which is special in that:

[0009] Including inlet pipe, outer round pipe, connecting clamp block and header;

[0010] There are several diversion units in the outer circular tube. Each diversion unit includes a middle casing and an inner circular tube. The middle casing is coaxially nested in the outer circular tube, and the inner circular tube is nested in the middle casing.

[0011] An inlet hole and an outlet hole are provided on the side wall of the outer circular tube, and the inlet hole and the outlet hole are separated by 180 degrees in the circumferential direction of the outer circular tube; the inlet hole is connected to the inlet pipe, and each diversion unit corresponds to an inlet hole; a hollow groove is provided on the middle casing, and the hollow groove cooperates with the inner wall of the outer circular tube and the outer wall of the inner circular tube to form a diversion groove, the inlet hole is connected to the inlet of the diversion groove, and the outlet of the diversion groove is connected to the outlet hole;

[0012] The outlet holes of the outer circular tubes are connected to the header through a connecting clamp. Partitions are provided at intervals inside the header to divide the header into several independent chambers. Each chamber corresponds to a connecting clamp, and one or more flat tubes are inserted into each chamber.

[0013] Furthermore, the upper and lower ends of the above-mentioned collecting pipe are equipped with blocking caps for sealing.

[0014] Furthermore, the outer circular tube, the middle sleeve and the inner circular tube are coaxially nested and then brazed.

[0015] In some embodiments, the middle casing includes a first channel, two connecting channels, two second channels, and four channel ports;

[0016] The first channel comprises a horizontal channel, the middle of which serves as the inlet of the diversion channel. The first channel is symmetrical about the center of the inlet, and its two ends are connected to the inlet of a connecting channel. The second channel also comprises a horizontal channel, and the outlet of the connecting channel is connected to the center of the horizontal channel in the second channel. The second channel is symmetrical about this center. The connecting channel and the second channel are perpendicular to each other at the connection point, thereby ensuring that the local resistance effect during each diversion is the same. The two ends of the second channel are channel ports, which are respectively connected to the outlet holes. The two connecting channels and the two second channels are symmetrical about the center of the first channel inlet.

[0017] The first channel is symmetrical about the inlet center, while the two connecting channels and the two second channels are symmetrical about the inlet hole. This ensures that the four flow paths are of equal length and have the same resistance along the path. The first channel is arranged horizontally at the entrance hole, and the second channel is arranged horizontally at the connecting channels, ensuring that gravity effects are uniform during flow diversion. The two-path arrangement of the middle casing ensures that the resistance along the path, local resistance, and gravity effects are identical for each flow path, thus achieving excellent liquid separation uniformity.

[0018] Furthermore, the cross-sectional area of ​​the inlet hole is greater than or equal to the flow cross-sectional area of ​​the first channel, the flow cross-sectional area of ​​the first channel is greater than or equal to the flow cross-sectional area of ​​the second channel, and the flow cross-sectional area of ​​the second channel is greater than or equal to the flow cross-sectional area of ​​the outlet hole, thereby ensuring that the flow rate after diversion matches the flow area.

[0019] In other embodiments, the middle casing includes a first channel, two connecting channels, two second channels, and four channel ports.

[0020] The first channel includes a vertical channel, the middle part of the vertical channel is the inlet of the diversion channel, the first channel is symmetrical about the center of the inlet, and the two ends of the first channel are respectively connected to the inlet of a connecting channel. The second channel also includes a vertical channel, and the outlet of the connecting channel is connected to the center position of the vertical channel of the second channel. The connecting channel and the second channel are perpendicular to each other at the connection point. The two ends of the second channel are channel ports, and the channel ports are respectively connected to the outlet holes; the two connecting channels and the two second channels are respectively symmetrical about the center of the inlet of the first channel.

[0021] The first channel is symmetrical about the center of the inlet hole, the second channel is symmetrical about the center of the connecting channel, and the two second channels are symmetrical about the center of the inlet hole. This ensures that the four flow paths are of equal length and have the same resistance along the path. Furthermore, the cross-sectional area of ​​the inlet hole is greater than or equal to the flow cross-sectional area of ​​the first channel, the flow cross-sectional area of ​​the first channel is greater than or equal to the flow cross-sectional area of ​​the second channel, and the flow cross-sectional area of ​​the second channel is greater than or equal to the flow cross-sectional area of ​​the outlet hole.

[0022] In other embodiments, the middle casing includes a first channel, two connecting channels, two second channels, and four channel ports; the first channel is a vertical channel, the middle of the vertical channel is the inlet of the diverter channel, the second channel includes a horizontal channel, the two ends of the first channel are respectively connected to the center position of the horizontal channel of the second channel, the second channel is centrally symmetrical about the center position, the two ends of the second channel are channel ports, and the channel ports are respectively connected to the outlet holes; the two connecting channels and the two second channels are respectively centrally symmetrical about the inlet of the first channel. In other embodiments, the middle casing includes a first channel, the first channel includes a horizontal channel, the middle of the horizontal channel is the inlet of the diverter channel, the first channel is centrally symmetrical about its inlet, and the two ends of the first channel are channel ports.

[0023] Furthermore, the cross-sectional area of ​​the inlet hole is greater than or equal to the flow cross-sectional area of ​​the first channel, and the flow cross-sectional area of ​​the first channel is greater than or equal to the flow cross-sectional area of ​​the outlet hole.

[0024] In other embodiments, the middle casing includes a first channel, six connecting channels, two second channels, four third channels, and eight channel ports.

[0025] The first channel includes a horizontal channel, the middle part of the horizontal channel is the inlet of the diversion channel, so that the fluid is divided into two opposite directions in the horizontal direction, ensuring that the gravity effect during diversion is the same, the first channel is symmetrical about the center of the inlet, and the two ends of the first channel are respectively connected to the inlet of a connecting channel. The second channel also includes a horizontal channel, and the outlet of the connecting channel is connected to the center position of the horizontal channel of the second channel, so that the fluid is divided into two opposite directions in the horizontal direction, ensuring that the gravity effect during diversion is the same, the second channel is centrally symmetrical about the center position, and the connecting channel and the second channel are perpendicular to each other at the connection; the two ends of the horizontal channel of the second channel are respectively connected to the inlet of a connecting channel, and the third channel also includes a horizontal channel, and the outlet of the connecting channel is connected to the center position of the horizontal channel of a third channel, so that the fluid is divided into two opposite directions in the horizontal direction, ensuring that the gravity effect during diversion is the same, the third channel is centrally symmetrical about the center position, and the connecting channel and the third channel are perpendicular to each other at the connection; the end of the third channel is a channel port, and the channel port is respectively connected to the outlet hole.

[0026] Furthermore, the cross-sectional area of ​​the above-mentioned inlet hole is greater than or equal to the flow cross-sectional area of ​​the first channel, the flow cross-sectional area of ​​the first channel is greater than or equal to the flow cross-sectional area of ​​the second channel, the flow cross-sectional area of ​​the second channel is greater than or equal to the flow cross-sectional area of ​​the third channel, and the flow cross-sectional area of ​​the third channel is greater than or equal to the flow cross-sectional area of ​​the outlet hole.

[0027] In addition, the present invention also provides a microchannel heat exchanger, which includes the above-mentioned liquid separation structure.

[0028] Advantages of the present invention:

[0029] 1. The present invention utilizes a two-branch structure and the arrangement of the liquid separation flow path, so that the local resistance effect, along-the-path resistance effect, and gravity effect of each branch are the same, thereby achieving better liquid separation uniformity.

[0030] 2. The present invention adopts the form of a hollow sleeve and arranges the liquid separation flow path on the circumference of the sleeve, which effectively expands the layout space of the flow path; multiple binary divisions are performed through the tortuous arrangement of the flow path on the circumference to achieve uniform liquid separation.

[0031] 3. The hollow sleeve of the present invention arranges the flow path on the circumference, leaving the space in the center of the sleeve empty, which not only saves material costs but also allows other pipelines of the microchannel heat exchanger to be arranged in the hollow part for coordinated use, thereby facilitating the realization of a compact structure of the heat exchanger.

[0032] 4. The present invention opens grooves on the sleeve and constructs a flow path by nesting the tubes, which is structurally convenient for processing and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1This is the liquid separation structure diagram of the microchannel heat exchanger;

[0034] Figure 2 This is a partial structural diagram of the outer circular tube;

[0035] Figure 3 This is a local structural diagram of the middle casing;

[0036] Figure 4 This is the middle casing two-way flow path diagram;

[0037] Figure 5 This is a partial structural diagram of another 4-way liquid dispensing cannula;

[0038] Figure 6 This is a partial structural diagram of another 4-way liquid dispensing cannula;

[0039] Figure 7 It is a partial structural diagram of a 2-way liquid separation sleeve;

[0040] Figure 8 This is a partial structural diagram of an 8-way liquid distribution sleeve.

[0041] As shown in the figure: inlet pipe 1, outer circular tube 2, middle casing 3, inner circular tube 4, connecting clamp 5, collecting pipe 6, plugging cap 7, partition 8, flat tube 9, inlet hole 201, outlet hole 202, first groove 301, connecting channel 302, second groove 303, groove port 304. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention for which protection is claimed, but merely represents selected embodiments of the present invention.

[0043] See also Figure 1 A liquid separation structure includes an inlet pipe 1, an outer circular tube 2, a middle casing 3, an inner circular tube 4, a connecting clamp 5, a header 6, a plugging cap 7, a partition 8, and a flat tube 9. Several flow separation units are arranged within the outer circular tube 2. Each flow separation unit includes a middle casing 3 and an inner circular tube 4. The middle casing 3 is coaxially nested within the outer circular tube 2, and the inner circular tube 4 is nested within the middle casing 3. The inner diameter of the outer circular tube 2 is equal to or slightly larger than the outer diameter of the middle casing 3, and the inner diameter of the middle casing 3 is equal to or slightly larger than the outer diameter of the inner circular tube 4, facilitating nested assembly.

[0044] See also Figure 2 The sidewall of the outer circular tube 2 is provided with an inlet hole 201 and an outlet hole 202, which are spaced 180° apart circumferentially from each other. The inlet hole 201 is connected to the inlet tube 1, and each diversion unit corresponds to an inlet hole 201. The middle casing 3 is provided with a hollow channel, which cooperates with the inner wall of the outer circular tube 2 and the outer wall of the inner circular tube 4 to form a diversion channel. The inlet hole 201 is connected to the inlet of the diversion channel, and the outlet of the diversion channel is connected to the outlet hole 202. The diameter of the inlet hole 201 is greater than or equal to the diameter of the outlet hole 202.

[0045] See also Figure 1 The outlet opening 202 of the outer circular tube 2 is connected to the manifold 6 via a connecting clamp 5. Inside the manifold 6, partitions 8 are installed at regular intervals. These partitions divide the manifold into several independent chambers, each corresponding to a connecting clamp 5. One or more flat tubes 9 are inserted into each chamber, each of which has microchannels. The upper and lower ends of the manifold 6 are sealed with plugging caps 7.

[0046] In some embodiments, see Figure 1 The outer circular tube 2, the middle sleeve 3 and the inner circular tube 4 are coaxially nested and brazed, and the hollow groove on the middle sleeve 3 cooperates with the inner wall of the outer circular tube 2 and the outer wall of the inner circular tube 4 to form a diversion groove.

[0047] In some embodiments, see Figure 3 and Figure 4 The middle casing 3 includes a first channel 301, two connecting channels 302, two second channels 303, and four channel ports 304. In this embodiment, the flow input from the inlet pipe 1 is evenly divided into four paths.

[0048] The first channel 301 comprises a horizontal channel, the middle of which serves as the inlet of the diversion channel. The first channel 301 is symmetrical about the center of the inlet, and the two ends of the first channel 301 are connected to the inlet of a connecting channel 302. The second channel 303 also comprises a horizontal channel, and the outlet of the connecting channel 302 is connected to the center of the horizontal channel of the second channel 303. The second channel 303 is symmetrical about the center of the horizontal channel. The connecting channel 302 and the second channel 303 are perpendicular to each other at the connection point, thereby ensuring that the local resistance effect during each diversion is the same. The two ends of the second channel 303 are channel ports 304, which are respectively connected to the outlet hole 202; the channel where the connecting channel 302 connects with the first channel 301 and the second channel 303 is a vertical channel, thereby ensuring that the local resistance effect during diversion is the same. The two ends of the second groove 303 are groove ports 304 , which are respectively connected to the outlet holes 202 ; the two connecting channels 302 and the two second grooves 303 are respectively symmetrical about the inlet center of the first groove 301 .

[0049] The first channel 301 is symmetrical about the center of the inlet, while the two connecting channels 302 and the two second channels 303 are symmetrical about the center of the inlet hole 201. This ensures that the four flow paths are of equal length and have the same resistance along the path. The first channel 301 is arranged horizontally at its connection with the inlet hole 201, and the second channel 303 is arranged horizontally at its connection with the connecting channels 302, ensuring that gravity effects are uniform during flow diversion. The two-path arrangement of the middle casing ensures that the resistance along the path, local resistance, and gravity effects of each flow path are identical, thus achieving excellent liquid separation uniformity.

[0050] Preferably, the cross-sectional area of ​​the inlet hole 201 in this embodiment is greater than or equal to the flow cross-sectional area of ​​the first groove 301, the flow cross-sectional area of ​​the first groove 301 is greater than or equal to the flow cross-sectional area of ​​the second groove 303, and the flow cross-sectional area of ​​the second groove 303 is greater than or equal to the flow cross-sectional area of ​​the outlet hole 202, thereby ensuring that the flow rate after diversion matches the flow area.

[0051] In other embodiments, see Figure 5 The middle casing 3 includes a first groove 301, two connecting channels 302, two second grooves 303, and four groove ports 304; in this embodiment, the flow input from the inlet pipe 1 is evenly divided into four paths.

[0052] The first channel 301 includes a vertical channel, the middle part of the vertical channel is the inlet of the diversion channel, the first channel 301 is symmetrical about the center of the inlet, the two ends of the first channel 301 are respectively connected to the inlet of a connecting channel 302, the second channel 303 also includes a vertical channel, the outlet of the connecting channel 302 is connected to the center position of the vertical channel of the second channel 303, the connecting channel 302 and the second channel 303 are perpendicular to each other at the connection point, the two ends of the second channel 303 are channel ports 304, and the channel ports 304 are respectively connected to the outlet holes 202; the two connecting channels 302 and the two second channels 303 are respectively symmetrical about the inlet center of the first channel 301.

[0053] The first channel is symmetrical about the center of the inlet hole, the second channel is symmetrical about the center of the connecting channel, and the two second channels 303 are symmetrical about the center of the inlet hole 201. This ensures that the four flow paths are of equal length and have the same resistance along the path. Preferably, the cross-sectional area of ​​the inlet hole 201 in this embodiment is greater than or equal to the flow cross-sectional area of ​​the first channel 301, the flow cross-sectional area of ​​the first channel 301 is greater than or equal to the flow cross-sectional area of ​​the second channel 303, and the flow cross-sectional area of ​​the second channel 303 is greater than or equal to the flow cross-sectional area of ​​the outlet hole 202.

[0054] In other embodiments, see Figure 6 The middle casing 3 includes a first groove 301, two connecting channels 302, two second grooves 303, and four groove ports 304; in this embodiment, the flow input from the inlet pipe 1 is evenly divided into four paths.

[0055] The first channel 301 is a vertical channel, the middle of which serves as the inlet of the diversion channel. The second channel 303 comprises a horizontal channel. The two ends of the first channel 301 connect to the center of the horizontal channel of the second channel 303. The second channel 303 is symmetrical about this center. The two ends of the second channel 303 are channel ports 304, which are respectively connected to the outlet hole 202. The two connecting channels 302 and the two second channels 303 are symmetrical about the inlet of the first channel 301. The first channel 301 is symmetrical about the inlet hole 201, and the two second channels 303 are symmetrical about the inlet hole 201. This ensures that the four flow paths formed are of the same length and have the same resistance along the way. The first channel 301 is a vertical section at the connecting channel, so gravity will affect liquid separation.

[0056] In other embodiments, see Figure 7 The above-mentioned middle casing 3 includes a first groove 301, which includes a horizontal groove. The middle part of the horizontal groove is the inlet of the diversion groove. The first groove 301 is symmetrical about its inlet center, and the two ends of the first groove 301 are groove ports 304.

[0057] In this embodiment, the flow input from the inlet pipe 1 is evenly divided into two paths.

[0058] Preferably, the cross-sectional area of ​​the inlet hole 201 in this embodiment is greater than or equal to the flow cross-sectional area of ​​the first channel 301 , and the flow cross-sectional area of ​​the first channel 301 is greater than or equal to the flow cross-sectional area of ​​the outlet hole 202 .

[0059] In other embodiments, see Figure 8 The middle casing 3 includes a first channel 301, six connecting channels 302, two second channels 303, four third channels 305, and eight channel ports 304. In this embodiment, the flow input from the inlet pipe 1 is evenly divided into 8 paths.

[0060] The first channel 301 includes a horizontal channel, the middle of which is the inlet of the diversion channel. The first channel 301 is symmetrical about the center of the inlet. The two ends of the first channel 301 are respectively connected to the inlet of a connecting channel 302. The second channel 303 also includes a horizontal channel. The outlet of the connecting channel 302 is connected to the center position of the horizontal channel of a second channel 303. The second channel 303 is symmetrical about the center position. The connecting channel 302 and the second channel 303 are perpendicular to each other at the connection; the ends of the second channel 303 are respectively connected to the inlet of a connecting channel 302. The third channel 305 also includes a horizontal channel. The outlet of the connecting channel 302 is connected to the center position of the horizontal channel of a third channel 305. The third channel 305 is symmetrical about the center position. The connecting channel 302 and the third channel 305 are perpendicular to each other at the connection; the end of the third channel 305 is a channel port 304, which is respectively connected to the outlet hole 202.

[0061] Preferably, the cross-sectional area of ​​the inlet hole 201 in this embodiment is greater than or equal to the flow cross-sectional area of ​​the first groove 301, the flow cross-sectional area of ​​the first groove 301 is greater than or equal to the flow cross-sectional area of ​​the second groove 303, the flow cross-sectional area of ​​the second groove 303 is greater than or equal to the flow cross-sectional area of ​​the third groove 305, and the flow cross-sectional area of ​​the third groove 305 is greater than or equal to the flow cross-sectional area of ​​the outlet hole 202.

[0062] The above embodiment divides the flow rate input from the inlet pipe 1 into two, four or eight paths. Similarly, the flow rate can be divided into two, four or eight paths by adopting the design concept provided by the present invention. n (2, 4, 8, 16, 32...) road structure.

[0063] The present invention further provides a microchannel heat exchanger comprising the above-mentioned liquid separation structure. Thus, the microchannel heat exchanger also has all the functions and effects of the above-mentioned liquid separation structure, which will not be described in detail here.

[0064] The above descriptions are merely embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied to other related system fields, are also included in the scope of protection of the present invention.

Claims

1. A liquid separation structure, characterized in that: It comprises an inlet pipe (1), an outer circular pipe (2), a connecting clamp (5), and a header (6); A plurality of flow diversion units are arranged in the outer circular tube (2), each flow diversion unit comprising a middle casing (3) and an inner circular tube (4), wherein the middle casing (3) is coaxially nested in the outer circular tube (2), and the inner circular tube (4) is coaxially nested in the middle casing (3). An inlet hole (201) and an outlet hole (202) are provided on the side wall of the outer circular tube (2), and the inlet hole (201) and the outlet hole (202) are spaced 180 degrees apart in the circumferential direction of the outer circular tube (2); the inlet hole (201) is connected to the inlet tube (1), and each diversion unit corresponds to an inlet hole (201); a hollow groove is provided on the middle sleeve (3), and the hollow groove cooperates with the inner wall of the outer circular tube (2) and the outer wall of the inner circular tube (4) to form a diversion groove, the inlet hole (201) is communicated with the inlet of the diversion groove, and the outlet of the diversion groove is connected to the outlet hole (202). The outlet hole (202) of the outer circular tube (2) is connected to the header (6) through a connecting clamp (5). Partitions (8) are provided at intervals inside the header (6). The partitions (8) divide the header (6) into a plurality of independent chambers. Each chamber corresponds to a connecting clamp (5). One or more flat tubes (9) are inserted into each chamber.

2. A liquid separation structure according to claim 1, characterized in that: The upper and lower ends of the header (6) are equipped with plugging caps (7) for sealing.

3. A liquid separation structure according to claim 2, characterized in that: The outer circular tube (2), the middle sleeve (3), and the inner circular tube (4) are coaxially nested and then brazed.

4. A liquid separation structure according to any one of claims 1 to 3, characterized in that: The middle casing (3) comprises a first groove (301), two connecting channels (302), two second grooves (303), and four groove ports (304); The first channel (301) includes a horizontal channel, the middle of the horizontal channel is the inlet of the diversion channel, the first channel (301) is symmetrical about the center of the inlet, and the two ends of the first channel (301) are respectively connected to the inlet of a connecting channel (302), the second channel (303) also includes a horizontal channel, the outlet of the connecting channel (302) is connected to the center position of the horizontal channel in the second channel (303), the second channel (303) is symmetrical about the center position, the connecting channel (302) and the second channel (303) are perpendicular to each other at the connection point, the two ends of the second channel (303) are channel ports (304), and the channel ports (304) are respectively connected to the outlet hole (202); the two connecting channels (302) and the two second channels (303) are respectively symmetrical about the center of the inlet of the first channel (301).

5. A liquid separation structure according to claim 4, characterized in that: The cross-sectional area of ​​the inlet hole (201) is greater than or equal to the flow cross-sectional area of ​​the first channel (301), the flow cross-sectional area of ​​the first channel (301) is greater than or equal to the flow cross-sectional area of ​​the second channel (303), and the flow cross-sectional area of ​​the second channel (303) is greater than or equal to the flow cross-sectional area of ​​the outlet hole (202).

6. A liquid separation structure according to any one of claims 1 to 3, characterized in that: The middle casing (3) comprises a first groove (301), two connecting channels (302), two second grooves (303), and four groove ports (304); The first channel (301) includes a vertical channel, the middle of the vertical channel is the inlet of the diversion channel, the first channel (301) is symmetrical about the center of the inlet, the two ends of the first channel (301) are respectively connected to the inlet of a connecting channel (302), the second channel (303) also includes a vertical channel, the outlet of the connecting channel (302) is connected to the center position of the vertical channel of the second channel (303), the connecting channel (302) and the second channel (303) are perpendicular to each other at the connection point, the two ends of the second channel (303) are channel ports (304), and the channel ports (304) are respectively connected to the outlet holes (202); the two connecting channels (302) and the two second channels (303) are respectively symmetrical about the center of the inlet of the first channel (301).

7. A liquid separation structure according to any one of claims 1 to 3, characterized in that: The middle casing (3) comprises a first groove (301), two connecting channels (302), two second grooves (303), and four groove ports (304); The first channel (301) is a vertical channel, the middle of the vertical channel is the inlet of the diversion channel, the second channel (303) includes a horizontal channel, the two ends of the first channel (301) are respectively connected to the center position of the horizontal channel of the second channel (303), the second channel (303) is centrally symmetrical about the center position, the two ends of the second channel (303) are channel ports (304), and the channel ports (304) are respectively connected to the outlet hole (202); the two connecting channels (302) and the two second channels (303) are respectively centrally symmetrical about the inlet of the first channel (301).

8. A liquid separation structure according to any one of claims 1 to 3, characterized in that: The middle casing (3) comprises a first channel (301), the first channel (301) comprises a horizontal channel, the middle portion of the horizontal channel is the inlet of the diversion channel, the first channel (301) is symmetrical about the center of its inlet, and the two ends of the first channel (301) are channel ports (304).

9. A liquid separation structure according to any one of claims 1 to 3, characterized in that: The middle casing (3) comprises a first groove (301), six connecting channels (302), two second grooves (303), four third grooves (305), and eight groove ports (304); The first channel (301) includes a horizontal channel, the middle of the horizontal channel is the inlet of the diversion channel, the first channel (301) is symmetrical about the center of the inlet, and the two ends of the first channel (301) are respectively connected to the inlet of a connecting channel (302), and the second channel (303) also includes a horizontal channel, and the outlet of the connecting channel (302) is connected to the center position of the horizontal channel of the second channel (303), and the second channel (303) is symmetrical about the center position. The connecting channel (302) and the second channel (303) are connected at the connection. The ends of the second grooves (303) are respectively connected to the entrances of the connecting channels (302), the third grooves (305) also include a horizontal groove, the outlet of the connecting channel (302) is connected to the center position of the horizontal groove of the third groove (305), the third grooves (305) are centrally symmetrical about the center position, and the connecting channel (302) and the third grooves (305) are perpendicular to each other at the connection point; the ends of the third grooves (305) are groove ports (304), and the groove ports (304) are respectively connected to the outlet holes (202).

10. A microchannel heat exchanger, characterized in that: The invention comprises a liquid separation structure as described in any one of claims 1 to 9.

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