A sleeve multi-channel liquid separation structure and microchannel heat exchanger

Abstract

The present invention belongs to the field of refrigeration technology and equipment, and relates to a sleeve multi-channel liquid separation structure, comprising an inlet pipe, an outer sleeve, a middle sleeve, an inner sleeve, a header and a flat tube; a plurality of diversion units are provided in the outer sleeve, each diversion unit comprises a middle sleeve and an inner sleeve, the middle sleeve is coaxially nested in the outer sleeve, the inner sleeve is coaxially nested in the middle sleeve, and the outer sleeve is provided with an inlet hole and an outlet hole; the inlet hole is connected to the inlet pipe, and each diversion unit corresponds to an inlet hole; a groove is provided on the middle sleeve, the hollow groove cooperates with the inner wall of the outer sleeve and the outer wall of the inner sleeve to form a diversion groove, the inlet hole is connected to the inlet of the diversion groove, and the groove port of the diversion groove is connected to the outlet hole; the header is provided with an entry hole and a flat tube groove. The sleeve multi-channel liquid separation structure provided by the present invention has a liquid separation flow path arranged so that the local resistance of each liquid separation port remains consistent, thereby achieving better liquid separation uniformity.

Description

Technical Field

[0001] The present invention belongs to the field of refrigeration technology and equipment, and in particular relates to a sleeve multi-channel liquid distribution 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 flow diversion and convergence. At the evaporator inlet, the refrigerant is typically in a two-phase state, gas-liquid. If 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, compromising the MCH's heat transfer capacity.

[0003] The existing liquid separation structure of microchannel heat exchangers generally has the following disadvantages:

[0004] 1. Traditional external distributors are well-established in copper tube heat exchangers. However, microchannel heat exchangers have a large number of flat tubes, making the use of external distributors complex and costly. This also hinders space compression and the formation of an integrated liquid distribution 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. Summary of the Invention

[0006] The present invention proposes a sleeve multi-path liquid separation structure and a microchannel heat exchanger, which mainly adopts sleeves to be nested to form liquid separation flow paths, and utilizes the arrangement of the flow paths to keep the local resistance of each liquid separation port consistent, thereby achieving better liquid separation uniformity.

[0007] The technical solution of the present invention to solve the above problems is:

[0008] In the first aspect, the present invention proposes a cannula multi-channel liquid distribution structure, which is special in that:

[0009] Including inlet pipe, outer casing, middle casing, inner casing, header and flat pipe;

[0010] There are several diversion units in the outer casing, each of which includes a middle casing and an inner casing. The middle casing is coaxially nested in the outer casing, and the inner casing is coaxially nested in the middle casing.

[0011] The outer casing is provided with a plurality of inlet holes and outlet holes; the inlet holes are connected to the inlet pipe, and each diversion unit corresponds to an inlet hole; the middle casing is provided with a hollow groove, which cooperates with the inner wall of the outer casing and the outer wall of the inner casing to form a diversion groove, the inlet holes are connected to the inlet of the diversion groove, and the groove port of the diversion groove is connected to the outlet hole;

[0012] The collecting pipe is provided with an inlet hole and a flat tube groove. The flat tube groove is connected with the outlet hole through the inlet hole. One end of the flat tube is inserted into the flat tube groove. The flat tube has a plurality of micro channels inside.

[0013] Furthermore, the tube wall of the above-mentioned middle sleeve is provided with an inlet, a plurality of hollow first grooves and a second groove. The hollow first groove cooperates with the inner wall of the outer sleeve and the outer wall of the inner sleeve to form a liquid separation flow path. One end of each first groove is connected to the inlet, and the other end of the first groove is connected to the center of the second groove through a connecting channel. The end of the second groove is a groove port.

[0014] Furthermore, the connecting channel is vertically connected to the center of the second groove.

[0015] In some embodiments of the present invention, the number of the first grooves is two, and the two first grooves are symmetrical about the center of the inlet.

[0016] In some embodiments of the present invention, the number of the first grooves is three, and the angles between the three first grooves at the inlet are 120°.

[0017] In some embodiments of the present invention, the number of the first channels is four, and the angles between the four first channels at the inlet are 90°.

[0018] Furthermore, the inner diameter of the outer casing is equal to or slightly larger than the outer diameter of the middle casing, and the inner diameter of the middle casing is equal to or slightly larger than the outer diameter of the inner casing.

[0019] Furthermore, the above-mentioned collection pipe also includes a side plate. One side of the collection pipe is an arc surface, which cooperates with the outer surface of the outer sleeve, and the other side is a plane. The entry hole of the collection pipe passes through the collection pipe from the side, and the side plate is used to block the other side of the entry hole.

[0020] Furthermore, the cross-sectional area of ​​the above-mentioned inlet 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.

[0021] In a second aspect, the present invention further proposes a microchannel heat exchanger, which is special in that it includes the above-mentioned sleeve multi-channel liquid distribution structure.

[0022] Advantages of the present invention:

[0023] 1. The multi-channel liquid separation structure of the cannula provided by the present invention has a liquid separation flow path arrangement that maintains consistent local resistance at each liquid separation port, thereby achieving good liquid separation uniformity;

[0024] 2. The cannula multi-channel liquid separation structure adopts the form of a cannula, and the liquid separation flow path is arranged on the circumference of the cannula, which effectively expands the layout space of the flow path.

[0025] 3. The sleeve multi-channel liquid distribution structure has grooves on the sleeve, and the flow path is constructed by nesting the tubes, which is convenient for processing and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of a 4-way liquid dispensing cannula;

[0027] Figure 2 This is a structural diagram of a 6-way liquid dispensing cannula;

[0028] Figure 3 It is a structural diagram of an 8-way liquid distribution single sleeve.

[0029] As shown in the figure: inlet pipe 1, outer casing 2, middle casing 3, inner casing 4, collecting pipe 5, flat tube 6, inlet hole 201, outlet hole 202, inlet 301, first groove 302, connecting channel 303, second groove 304, groove port 305, entry hole 501, flat tube groove 502, and side plate 503. DETAILED DESCRIPTION

[0030] 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.

[0031] See also Figure 1 A casing multi-channel liquid distribution structure includes an inlet pipe 1, an outer casing 2, a middle casing 3, an inner casing 4, a collecting pipe 5 and a flat tube 6.

[0032] Several flow diversion units are located within the outer casing 2. Each diversion unit comprises a middle casing 3 and an inner casing 4. The middle casing 3 coaxially nests within the outer casing 2, while the inner casing 4 coaxially nests within the middle casing 3. The inner diameter of the outer casing 2 is equal to or slightly larger than the outer diameter of the middle casing 3, while the inner diameter of the middle casing 3 is equal to or slightly larger than the outer diameter of the inner casing 4, facilitating nested assembly. The middle casing 3 is grooved and coaxially nests with the outer casing 2 and inner casing 4 to form a flow path.

[0033] The outer sleeve 2 is provided with a plurality of inlet holes 201 and outlet holes 202 . The inlet holes 201 and the outlet holes 202 are spaced 180 degrees apart in the circumferential direction. The diameter of the inlet holes 201 is greater than or equal to the diameter of the outlet holes 202 .

[0034] Inlet hole 201 connects to inlet pipe 1, with one inlet hole 201 corresponding to each diversion unit. A hollowed-out channel is provided on the middle casing 3, which cooperates with the inner wall of the outer casing 2 and the outer wall of the inner casing 4 to form a diversion channel. Inlet hole 201 communicates with the inlet 301 of the diversion channel, and the channel port 305 of the diversion channel connects to the outlet hole 202. The manifold 5 is provided with an inlet hole 501 and a flat tube groove 502, which communicates with the outlet hole 202 via the inlet hole 501. One end of the flat tube 6 is inserted into the flat tube groove 502, and the flat tube 6 has a plurality of microchannels inside.

[0035] In some embodiments provided by the present invention, the manifold 5 also includes a side plate 503. One side surface of the manifold 5 is an arc surface that completely matches the outer surface of the outer sleeve 2, and the other side surface is a plane. The inlet hole 501 of the manifold 5 passes through the manifold from the side, and the side plate 503 is used to block the other side of the inlet hole 501.

[0036] In some embodiments provided by the present invention, the cross-sectional area of ​​the inlet 301 is greater than or equal to the flow cross-sectional area of ​​the first channel 302, the flow cross-sectional area of ​​the first channel 302 is greater than or equal to the flow cross-sectional area of ​​the second channel 304, and the flow cross-sectional area of ​​the second channel 304 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.

[0037] In some embodiments provided by the present invention, an inlet 301, several hollow first grooves 302 and second grooves 304 are provided on the tube wall of the middle sleeve 3. The hollow first grooves 302 cooperate with the inner wall of the outer sleeve 2 and the outer wall of the inner sleeve 4 to form a liquid separation flow path. One end of each first groove 302 is connected to the inlet 301, and the other end of the first groove 302 is connected to the center of the second groove 304 through the connecting channel 303. The end of the second groove 304 is a groove port 305.

[0038] As a preferred embodiment of the present invention, see Figure 1 In a diversion unit, the outer casing 2 includes an inlet hole 201 and four outlet holes 202; the middle casing 3 includes an inlet 301, two first grooves 302, two connecting channels 303, two second grooves 304, and four groove ports 305. The angle between the two first grooves 302 at the connection point is 180°, thereby ensuring that the local resistance during diversion is the same.

[0039] The fluid enters the inlet hole 201 from the inlet pipe 1, then enters the inlet 301 and is divided into two paths to enter the two first grooves 302 respectively. After passing through the connecting channel 303, it vertically enters the center of the second groove 304, and then enters the inlet hole 501 from the groove port 305 and the outlet hole 202 respectively, and finally enters the flat tube 6 in the flat tube groove 502, realizing four-way liquid separation.

[0040] The connecting channel 303 vertically enters the center of the second channel 304 to ensure that the local resistance during diversion is the same.

[0041] As a preferred embodiment of the present invention, see Figure 2 In a flow-dividing unit, the outer sleeve 2 includes one inlet hole 201 and six outlet holes 202. The inlet hole 201 is axially located at the center of the two outlet holes 202. The inlet hole 201 and the outlet holes 202 are circumferentially spaced 180° apart. The diameter of the inlet hole 201 is greater than or equal to the diameter of the outlet holes 202.

[0042] In a diversion unit, the middle casing 3 includes an inlet 301, three first channels 302, three connecting channels 303, three second channels 304, and six channel ports 305. The inlet hole 201 of the outer casing 2 is connected to the inlet 301 of the middle casing 3, and the inlet 301 is connected to the three first channels 302. The angles between the three first channels 302 at the connection point are 120 degrees, thereby ensuring that the local resistance during diversion is the same. The fluid enters the inlet hole 201 from the inlet pipe 1, and then enters the inlet 301 and is divided into three paths to enter the three first channels 302 respectively. The other end of the first channel 302 is connected to the inlet of the connecting channel 303, and the outlet of the connecting channel 303 is connected to the center of the second channel 304. The connecting channel 303 enters the center of the second channel 304 vertically, thereby ensuring that the local resistance during diversion is the same. Each second channel 304 is connected to two channel ports 305. The channel port 305 is in communication with the outlet hole 202. Each flow-dividing unit eventually flows out from six channel ports 305, thus achieving six-way liquid separation.

[0043] As a preferred embodiment of the present invention, see Figure 3In a diversion unit, the outer casing 2 includes an inlet hole 201 and eight outlet holes 202; the middle casing 3 includes an inlet 301, four first grooves 302, four connecting channels 303, four second grooves 304, and eight groove ports 305. The four first grooves 302 are at an angle of 90 degrees to each other at the inlet 301, thereby ensuring that the local resistance during diversion is the same. The fluid enters the inlet hole 201 from the inlet pipe 1, and then enters the inlet 301 and is divided into four paths to enter the four first grooves 302 respectively. The other end of the first groove 302 is connected to the inlet of the connecting channel 303, and the outlet of the connecting channel 303 is connected to the center of the second groove 304, and the connecting channel 303 enters the center of the second groove 304 vertically, thereby ensuring that the local resistance during diversion is the same. Each second groove 304 is connected to two groove ports 305, and the groove ports 305 are connected to the outlet hole 202. Each diversion unit eventually flows out from eight channel ports 305 , achieving eight-way liquid separation.

[0044] As can be seen from the above, the idea provided by the present invention can be used to design a liquid-dividing sleeve structure that can evenly divide the flow into other numbers of branches.

[0045] The present invention further provides a microchannel heat exchanger comprising any of the above-mentioned sleeve multi-way liquid distribution structures. Thus, the microchannel heat exchanger also has all the functions and effects of the above-mentioned sleeve multi-way liquid distribution structures, which will not be described in detail here.

[0046] 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 cannula multi-channel liquid separation structure, characterized in that: It comprises an inlet pipe (1), an outer casing (2), a middle casing (3), an inner casing (4), a header (5) and a flat tube (6); A plurality of flow diversion units are provided in the outer casing (2), each flow diversion unit comprising a middle casing (3) and an inner casing (4), the middle casing (3) being coaxially nested in the outer casing (2), and the inner casing (4) being coaxially nested in the middle casing (3). The outer sleeve (2) is provided with a plurality of inlet holes (201) and outlet holes (202); the inlet hole (201) is connected to the inlet pipe (1), and each diversion unit corresponds to an inlet hole (201); the middle sleeve (3) is provided with a hollow channel, and the hollow channel cooperates with the inner wall of the outer sleeve (2) and the outer wall of the inner sleeve (4) to form a diversion channel, the inlet hole (201) is communicated with the inlet (301) of the diversion channel, and the channel port (305) of the diversion channel is connected to the outlet hole (202); The manifold (5) is provided with an inlet hole (501) and a flat tube groove (502). The flat tube groove (502) is connected to the outlet hole (202) through the inlet hole (501). One end of the flat tube (6) is inserted into the flat tube groove (502). The flat tube (6) has a plurality of microchannels inside.

2. The cannula multi-channel liquid separation structure according to claim 1, characterized in that: An inlet (301), a plurality of hollow first grooves (302) and a second groove (304) are provided on the wall of the middle sleeve (3). The hollow first grooves (302) cooperate with the inner wall of the outer sleeve (2) and the outer wall of the inner sleeve (4) to form a liquid separation flow path. One end of each first groove (302) is connected to the inlet (301), and the other end of the first groove (302) is connected to the center of the second groove (304) through a connecting channel (303). The end of the second groove (304) is a groove port (305).

3. The cannula multi-channel liquid separation structure according to claim 2, characterized in that: The connecting channel (303) is vertically connected to the center of the second channel (304).

4. The cannula multi-channel liquid separation structure according to claim 3, characterized in that: The number of the first grooves (302) is two, and the angles between the two first grooves (302) and the inlet (301) are 180°.

5. The cannula multi-channel liquid separation structure according to claim 3, characterized in that: The number of the first grooves (302) is three, and the angles between the three first grooves (302) at the inlet (301) are 120°.

6. The cannula multi-channel liquid separation structure according to claim 3, characterized in that: The number of the first grooves (302) is four, and the angles between the four first grooves (302) at the inlet (301) are 90°.

7. A cannula multi-channel liquid separation structure according to any one of claims 1 to 6, characterized in that: The inner diameter of the outer casing (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 casing (4).

8. A cannula multi-channel liquid separation structure according to any one of claims 1 to 6, characterized in that: The manifold (5) further includes a side plate (503). One side surface of the manifold (5) is an arc surface, which cooperates with the outer surface of the outer sleeve (2), and the other side surface is a plane. The inlet hole (501) of the manifold (5) passes through the manifold from the side, and the side plate (503) is used to block the other side of the inlet hole (501).

9. A cannula multi-channel liquid separation structure according to any one of claims 1 to 6, characterized in that: The cross-sectional area of ​​the inlet (301) is greater than or equal to the flow cross-sectional area of ​​the first channel (302), the flow cross-sectional area of ​​the first channel (302) is greater than or equal to the flow cross-sectional area of ​​the second channel (304), and the flow cross-sectional area of ​​the second channel (304) is greater than or equal to the flow cross-sectional area of ​​the outlet hole (202).

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

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