A solid sleeve 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 solid sleeve liquid separation structure and a microchannel heat exchanger. A solid sleeve liquid separation structure includes an inlet pipe, an outer hollow tube, a connecting clamp, and a manifold; a plurality of diversion units are provided in the outer hollow tube, each diversion unit includes an inner solid tube, and the inner solid tube is coaxially nested in the outer hollow tube; the outlet hole of the outer hollow tube is connected to the manifold through the connecting clamp, and a plurality of partitions are provided inside the manifold, which divide the interior of the manifold into a plurality of independent chambers, each chamber corresponding to a connecting clamp, and one or more flat tubes are inserted in each chamber. The present invention mainly uses solid 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 as similar as possible, 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 solid sleeve 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 solid sleeve liquid separation structure and a microchannel heat exchanger, which mainly adopts solid sleeves to be nested 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 as similar as possible, thereby achieving better liquid separation uniformity.

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

[0009] It includes inlet pipe, outer hollow pipe, connecting clamp block and header;

[0010] A plurality of diversion units are arranged in the outer hollow tube, each of which comprises an inner solid tube, which is coaxially nested in the outer hollow tube;

[0011] An inlet hole and an outlet hole are provided on the side wall of the outer hollow tube, and the inlet hole and the outlet hole are 180° apart in the circumferential direction of the outer hollow tube; the inlet hole is connected to the inlet tube, and a groove is provided on the side of the inner solid tube, and the groove cooperates with the inner wall of the outer hollow tube to form a diversion groove; the inlet hole is vertically connected to the inlet of the diversion groove, and the outlet of the diversion groove is connected to the outlet hole.

[0012] The outlet hole of the outer hollow tube is connected to the header through a connecting clamp. Multiple partitions are provided 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 in each chamber.

[0013] In one embodiment, the outer surface of the inner solid tube is provided with a first channel, two connecting channels, two second channels, and four channel ports;

[0014] The first channel includes a horizontal channel, the middle part of the horizontal 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 horizontal channel, and the outlet of the connecting channel is connected to the center position of the horizontal channel in the second channel. The second channel is symmetrical about the center position, and 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, one of which is directly connected to the outlet hole, and the other channel port is connected to the outlet hole through the through hole on the inner solid tube; the two connecting channels and the two second channels are symmetrical about the center of the inlet of the first channel.

[0015] The first channel is symmetrical about the center of the inlet, while the two connecting channels 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. The first channel is arranged horizontally at the connection with the inlet hole, and the second channel is arranged horizontally at the connection with the connecting channel, ensuring that the effects of gravity during flow diversion are uniform. The two-path arrangement of the inner solid tube ensures that the resistance along the path, local resistance, and gravity effects are as similar as possible for each flow path, thereby achieving excellent liquid separation uniformity.

[0016] 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.

[0017] In one embodiment, the outer surface of the inner solid tube is provided with a first channel, six connecting channels, two second channels, four third channels, and eight channel ports;

[0018] The first channel includes a horizontal channel, the middle part of the horizontal 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 horizontal channel, the outlet of the connecting channel is connected to the center position of the horizontal channel of the second channel, 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 ends of the second channel are respectively connected to the inlet of a connecting channel, the third channel also includes a horizontal channel, the outlet of the connecting channel is connected to the center position of the horizontal channel of the third channel, 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; each third channel corresponds to two channel ports, one of which is directly connected to the outlet hole, and the other channel port is connected to the outlet hole through a through hole on the inner solid tube.

[0019] The inlet hole is perpendicular to the horizontal section where it connects to the first channel, and each connecting channel flows vertically into the second and third channels, respectively, ensuring uniform local resistance during flow diversion. The first channel is arranged horizontally at its connection to the inlet hole, the second channel is arranged horizontally at its connection to the bifurcated outlet, and the third channel is arranged horizontally at its connection to the bifurcated outlet, ensuring uniform gravity during flow diversion.

[0020] 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, 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, thereby ensuring that the flow rate after diversion matches the flow area.

[0021] The present invention also provides another solid casing liquid separation structure, comprising an inlet pipe, an outer hollow pipe, a connecting clamp block, and a header;

[0022] Several diversion units are arranged in the outer hollow tube, each of which includes a middle hollow tube and an inner solid tube. The middle hollow tube is coaxially nested in the outer hollow tube, and the inner solid tube is coaxially nested in the middle hollow tube.

[0023] An inlet hole and an outlet hole are provided on the side wall of the outer hollow tube, and the inlet hole and the outlet hole are 180° apart in the circumferential direction of the outer hollow tube; the inlet hole is connected to the inlet tube, and a hollow groove is provided on the middle hollow tube, and the groove cooperates with the inner wall of the outer hollow tube and the outer wall of the inner solid tube to form a diversion groove; the inlet hole is vertically connected to the inlet of the diversion groove, and the outlet of the diversion groove is connected to the outlet hole.

[0024] The outlet hole of the outer hollow tube is connected to the header through a connecting clamp. Multiple partitions are provided 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 in each chamber.

[0025] Furthermore, the outer surface of the middle hollow tube is provided with a first channel, two connecting channels, two second channels, and four channel ports;

[0026] The first channel includes a horizontal channel, the middle part of the horizontal 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 horizontal channel, and the outlet of the connecting channel is connected to the center position of the horizontal channel in the second channel. The second channel is symmetrical about the center position, and 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, one of which is directly connected to the outlet hole of the outer hollow tube, and the other channel port is connected to the outlet hole through the through hole on the inner solid tube; the two connecting channels and the two second channels are symmetrical about the center of the inlet of the first channel.

[0027] The first channel is symmetrical about the center of the inlet, while the two connecting channels 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. The first channel is arranged horizontally at its connection to the inlet hole, and the second channel is arranged horizontally at its connection to the connecting channel, ensuring that gravity effects are uniform during flow diversion. The two-channel arrangement, consisting of an outer hollow tube, an inner solid tube, and a middle hollow tube, ensures that the resistance along the path, local resistance, and gravity effects are as uniform as possible for each flow path, thereby achieving excellent liquid separation uniformity.

[0028] 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.

[0029] Furthermore, the upper and lower ends of the header are equipped with plugging caps for sealing.

[0030] In addition, the present invention also provides a microchannel heat exchanger, which includes the above-mentioned solid sleeve liquid separation structure.

[0031] Advantages of the present invention:

[0032] 1. The present invention utilizes a two-branch structure and the arrangement of the liquid separation flow path to make the local resistance, along-the-path resistance, and gravity of each branch as similar as possible, thereby achieving better liquid separation uniformity.

[0033] 2. The present invention adopts the form of a 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 uniformity of liquid separation.

[0034] 3. 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

[0035] Figure 1 This is a diagram of the solid casing liquid separation structure;

[0036] Figure 2 This is another diagram of the structure of a 4-way liquid dispensing cannula;

[0037] Figure 3 This is a structural diagram of an 8-way liquid distribution sleeve.

[0038] As shown in the figure: inlet pipe 1, outer hollow tube 2, inner solid tube 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, through hole 305, and third groove 306. DETAILED DESCRIPTION

[0039] 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.

[0040] Example 1

[0041] See also Figure 1 A solid sleeve liquid separation structure includes an inlet pipe 1, an outer hollow pipe 2, an inner solid pipe 3, a connecting clamp 5, a collecting pipe 6, a blocking cap 7, a partition 8, and a flat tube 9.

[0042] The outer hollow tube 2 is provided with a plurality of diversion units, each of which includes an inner solid tube 3 coaxially nested in the outer hollow tube 2. The inner diameter of the outer hollow tube 2 is equal to or slightly larger than the outer diameter of the inner solid tube 3.

[0043] The sidewall of the outer hollow tube 2 is provided with an inlet hole 201 and an outlet hole 202, circumferentially spaced 180° apart. The inlet hole 201 connects to the inlet tube 1, with each diversion unit corresponding to an inlet hole 201. The inner solid tube 3 is provided with a groove of a certain depth, which cooperates with the inner wall of the outer hollow tube 2 to form a diversion groove. The inlet hole 201 communicates with the inlet of the diversion groove, and the outlet of the diversion groove connects 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.

[0044] See also Figure 1 The outlet opening 202 of the outer hollow 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. Each chamber houses one or more flat tubes 9, each containing microchannels. The upper and lower ends of the manifold 6 are sealed with plugging caps 7.

[0045] In some embodiments, the outer hollow tube 2 and the inner solid tube 3 are coaxially nested and then brazed, and the groove on the inner solid tube 3 cooperates with the inner wall of the outer hollow tube 2 to form a diversion groove.

[0046] The diversion unit in the above embodiment 1 can be implemented in the form of the following embodiments.

[0047] Example 2

[0048] See also Figure 1 The inner solid tube 3 in the diversion unit 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.

[0049] 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 channel 303 are channel ports 304. One of the channel ports 304 is directly connected to the outlet hole 202, and the other channel port 304 is connected to the outlet hole 202 of the outer hollow tube 2 via a through hole 305. The two connecting channels 302 and the two second channels 303 are symmetrical about the inlet center of the first channel 301.

[0050] The first channel 301 is symmetrical about the center of the inlet, and the two connecting channels 302 and the two second channels 303 are symmetrical about the center of the inlet hole 201, thereby ensuring 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 the connection with the inlet hole 201, and the second channel 303 is arranged horizontally at the connection with the connecting channel 302, thereby ensuring that the gravity effect during diversion is the same. The two-channel arrangement of this embodiment ensures that the resistance along the path, local resistance, and gravity effect of each flow path are as consistent as possible, thereby achieving good liquid separation uniformity.

[0051] 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.

[0052] Example 3

[0053] See also Figure 2 Compared to Example 2, this embodiment differs in that the flow diversion unit within the outer hollow tube 2 comprises a middle hollow tube 4 and an inner solid tube 3; the first channel 301, two connecting channels 302, two second channels 303, and four channel ports 304 are hollowed out on the middle hollow tube 4. The middle hollow tube 4 is coaxially nested within the outer hollow tube 2, and the inner solid tube 3 is coaxially nested within the middle hollow tube 4.

[0054] Compared with Example 2, this embodiment only changes Figure 1 The inner solid tube is split into Figure 2 The middle hollow tube 4 and the inner solid tube 3, so Figure 2 and Figure 1 The only difference is in processing and assembly, and the liquid separation effect is exactly the same.

[0055] Example 4

[0056] See also Figure 3 The inner solid tube 3 includes a first channel 301, six connecting channels 302, two second channels 303, four third channels 306, and eight channel ports 304. In this embodiment, the flow input from the inlet pipe 1 is evenly divided into 8 paths.

[0057] The first channel 301 includes a horizontal channel, the middle of which is the inlet of the diverter 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 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 ends of the second channel 303 are respectively connected to The entrance of a connecting channel 302, the third channel 306 also comprises a horizontal channel. The outlet of the connecting channel 302 connects to the center of the horizontal channel of the third channel 306. The third channel 306 is centrosymmetrical about this center. The connecting channel 302 and the third channel 306 are perpendicular to each other at the connection point. Each third channel 306 corresponds to two channel ports 304, one of which is directly connected to the outlet hole 202, and the other is connected to the outlet hole 202 via a through hole 305 in the inner solid tube 3. The horizontal section at the connection between the inlet hole 201 and the first channel 301 is perpendicular. Each connecting channel vertically connects to the second channel 303 and the third channel 306, respectively, thereby ensuring the same local resistance during flow diversion. The first channel 301 connected to the inlet hole 201 is arranged horizontally, the second channel 303 connected to the two-way opening 302 is arranged horizontally, and the third channel 306 connected to the two-way opening 302 is arranged horizontally, thereby ensuring the same gravity effect during diversion.

[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 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 306, and the flow cross-sectional area of ​​the third groove 306 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.

[0059] The above embodiment divides the flow rate input from the inlet pipe 1 into four or eight paths. Similarly, the flow rate can be divided into two paths by adopting the design concept provided by the present invention. n (2, 4, 8, 16, 32...) road structure.

[0060] The present invention further provides a microchannel heat exchanger comprising the above-mentioned solid sleeve liquid separation structure. Thus, the microchannel heat exchanger also has all the functions and effects of the above-mentioned solid sleeve liquid separation structure, which will not be described in detail here.

[0061] 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 solid sleeve liquid separation structure, characterized by: It comprises an inlet pipe (1), an outer hollow pipe (2), a connecting clamp (5), and a header (6); A plurality of flow diversion units are provided in the outer hollow tube (2), each flow diversion unit comprising an inner solid tube (3), and the inner solid tube (3) is coaxially nested in the outer hollow tube (2); An inlet hole (201) and an outlet hole (202) are provided on the side wall of the outer hollow tube (2), and the inlet hole (201) and the outlet hole (202) are spaced 180 degrees apart in the circumferential direction of the outer hollow tube (2); the inlet hole (201) is connected to the inlet tube (1), and a groove is provided on the side surface of the inner solid tube (3), and the groove cooperates with the inner wall of the outer hollow tube (2) to form a diversion groove; the inlet hole (201) is vertically connected to 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 hollow tube (2) is connected to the header (6) through a connecting clamp (5). A plurality of partitions (8) are provided inside the header (6). The partitions (8) divide the interior of the header (6) into a plurality of independent chambers. Each chamber corresponds to a connecting clamp (5), and one or more flat tubes (9) are inserted into each chamber.

2. The solid sleeve liquid separation structure according to claim 1, characterized in that: The outer surface of the inner solid tube (3) is provided with 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), 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 in the second channel (303), and the second channel (303) is symmetrical about the center position. (302) and the second groove (303) are perpendicular to each other at the connection point, and the two ends of the second groove (303) are groove ports (304), one of which is directly connected to the outlet hole (202), and the other groove port (304) is connected to the outlet hole (202) through a through hole (305) on the inner solid tube (3); the two connecting channels (302) and the two second grooves (303) are symmetrical about the inlet center of the first groove (301).

3. The solid sleeve liquid separation structure according to claim 2, 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).

4. The solid sleeve liquid separation structure according to claim 1, characterized in that: A first groove (301), six connecting channels (302), two second grooves (303), four third grooves (306), and eight groove ports (304) are provided on the outer surface of the inner solid tube (3); 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, the outlet of the connecting channel (302) is connected to the center position of the horizontal channel of the second channel (303), the second channel (303) is symmetrical about the center position, and 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 a connecting channel (302). The entrance of the channel (302), the third channel (306) also includes a horizontal channel, the outlet of the connecting channel (302) is connected to the center position of the horizontal channel of the third channel (306), the third channel (306) is centrally symmetrical about the center position, and the connecting channel (302) and the third channel (306) are perpendicular to each other at the connection point; each third channel (306) corresponds to two channel ports (304), one of which is directly connected to the outlet hole (202), and the other is connected to the outlet hole (202) through a through hole (305) on the inner solid tube (3).

5. The solid sleeve 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), the flow cross-sectional area of ​​the second channel (303) is greater than or equal to the flow cross-sectional area of ​​the third channel (306), and the flow cross-sectional area of ​​the third channel (306) is greater than or equal to the flow cross-sectional area of ​​the outlet hole (202).

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

7. The solid sleeve liquid separation structure according to claim 6, characterized in that: The outer surface of the middle hollow tube (4) is provided with 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), 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 in the second channel (303), and the second channel (303) is symmetrical about the center position. The connecting channel (302) is connected to the center position of the horizontal channel in the second channel (303). ) and the second groove (303) are perpendicular to each other at the connection point, and the two ends of the second groove (303) are groove ports (304), one of the groove ports (304) is directly connected to the outlet hole (202) of the outer hollow tube (2), and the other groove port (304) is connected to the outlet hole (202) through a through hole (305) on the inner solid tube (3); the two connecting channels (302) and the two second grooves (303) are symmetrical about the inlet center of the first groove (301).

8. The solid sleeve liquid separation structure according to claim 7, 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).

9. A solid sleeve liquid separation structure according to any one of claims 6 to 8, characterized in that: The upper and lower ends of the header (6) are provided with plugging caps (7) for sealing.

10. A microchannel heat exchanger, characterized in that: It comprises the solid sleeve liquid separation structure as described in any one of claims 1-9.

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