A sleeve liquid distribution structure and a micro-channel heat exchanger

Abstract

The present application belongs to the field of refrigeration technology and equipment, and particularly relates to a sleeve pipe liquid distribution structure and a micro-channel heat exchanger. The sleeve pipe liquid distribution structure comprises an outer sleeve pipe, a middle sleeve pipe and an inner sleeve pipe, which are coaxially nested from outside to inside, and are respectively provided with an inlet hole. The hollow inner cavity of the inner sleeve pipe constitutes a rectifying section, and a third inlet hole is in communication with the rectifying section. A distribution cavity is formed between the top of the inner sleeve pipe and the upper end cover. The middle sleeve pipe is provided with a liquid distribution flow path, and the two ends of each liquid distribution flow path are respectively an inlet and an outlet. The outlet hole of the outer sleeve pipe is in communication with a header through a connecting clamp block. The header is internally provided with a partition plate at every interval, so as to divide the header into a plurality of independent chambers. Each chamber corresponds to a connecting clamp block, and a flat tube is inserted into each chamber. The sleeve pipe liquid distribution structure and the micro-channel heat exchanger can uniformly distribute gas-liquid two-phase fluid, and are not limited by the number of heat exchange branches.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of refrigeration technology and equipment, and particularly relates to a sleeve pipe liquid distribution structure and a micro-channel heat exchanger. BACKGROUND

[0002] At the inlet of the evaporator, the refrigerant is in a two-phase state, and the flow pattern is complex, so it is difficult to achieve average distribution of the flow and to exert the maximum heat transfer potential of the evaporator. In the traditional copper tube heat exchanger, a plug-in type, a conical type, a reflection type distributor, etc. are generally used. The principle is that the inlet pipe enters a mixing chamber with a larger volume, becomes a uniform mist flow, and is then distributed to each heat exchange branch by a capillary tube. In addition, a straight pipe section is usually arranged in front of the inlet pipe to eliminate the momentum of the previous pipe and to play a rectifying role. However, in the micro-channel heat exchanger, the number of micro-channel heat exchange branches is large, and the number of capillary tubes is also increased accordingly. The manufacturing process of the distributor is complex, the cost is greatly increased, and there is also a risk of pipe rupture.

[0003] Therefore, the existing gas-liquid two-phase flow distribution technology, especially the technology suitable for micro-channel heat exchangers, needs to be further researched and improved. SUMMARY

[0004] The present application provides a sleeve pipe liquid distribution structure and a micro-channel heat exchanger, which can uniformly distribute gas-liquid two-phase flow and are not limited by the number of heat exchange branches.

[0005] The technical scheme for solving the above problems of the present application is as follows:

[0006] In a first aspect, the present application provides a sleeve pipe liquid distribution structure, which is characterized in that:

[0007] The sleeve pipe liquid distribution structure comprises an inlet pipe, an outer sleeve pipe, a middle sleeve pipe, an inner sleeve pipe, an end cover, a connecting clamp block and a header.

[0008] The outer sleeve pipe, the middle sleeve pipe and the inner sleeve pipe are coaxially nested from outside to inside.

[0009] The outer sleeve pipe is provided with a first inlet hole and a plurality of outlet holes on the pipe wall, and the first inlet hole is located at the lower part of the outer sleeve pipe; the first inlet hole is connected to the inlet pipe; the middle sleeve pipe is provided with a second inlet hole on the pipe wall, and the inner sleeve pipe is provided with a third inlet hole on the pipe wall, and the first inlet hole, the second inlet hole and the third inlet hole are sequentially communicated.

[0010] The upper and lower ends of the outer sleeve pipe are respectively sealed by the end cover, the hollow inner cavity of the inner sleeve pipe constitutes a rectifying section, and the third inlet hole is communicated with the rectifying section; the top of the inner sleeve pipe is lower than the top of the outer sleeve pipe, so that a distribution chamber is formed between the top of the inner sleeve pipe and the end cover of the upper end,

[0011] The middle layer sleeve is provided with a plurality of hollow grooves, and the hollow grooves are matched with the inner wall of the outer layer sleeve and the outer wall of the inner layer sleeve to form a liquid distribution flow path. The two ends of each liquid distribution flow path are an inlet and an outlet respectively. The inlet of the groove is located at the top of the middle layer sleeve and is communicated with the distribution cavity. The outlet of the groove is communicated with the outlet hole of the outer layer sleeve.

[0012] The outlet hole of the outer layer sleeve is communicated with the header through a connecting clamp block. The header is provided with a partition plate at every interval inside the header. The partition plate divides the header into a plurality of independent cavities. Each cavity corresponds to a connecting clamp block. One or more flat tubes are inserted into each cavity. The flat tube has a plurality of micro-channels inside.

[0013] The two-phase refrigerant enters from the inlet pipe, sequentially passes through the first inlet hole, the second inlet hole and the third inlet hole to enter the rectifying section, flows upward in the rectifying section to reach the distribution cavity, and is evenly distributed into each groove through the distribution cavity. The refrigerant flows along the groove to reach the outlet hole of the outer layer sleeve. The refrigerant enters the independent cavity of the header through the connecting clamp block, and then enters the internal micro-channels of the flat tube inserted in the cavity, thereby completing the uniform distribution of the two-phase refrigerant.

[0014] Further, the inlet of each groove is of the same size and is uniformly distributed in the circumferential direction, thereby ensuring that the refrigerant in the distribution cavity is evenly distributed into each groove.

[0015] Further, the upper and lower ends of the header are sealed by a plug.

[0016] Further, the outer layer sleeve, the middle layer sleeve and the inner layer sleeve are coaxially nested and then brazed.

[0017] Further, the inner diameter of the outer layer sleeve is equal to or slightly larger than the outer diameter of the middle layer sleeve, and the inner diameter of the middle layer sleeve is equal to or slightly larger than the outer diameter of the inner layer sleeve, facilitating nested assembly.

[0018] In a second aspect, the application provides another sleeve liquid distribution structure, which is characterized in that:

[0019] The sleeve liquid distribution structure comprises an inlet pipe, an outer layer sleeve, a middle layer sleeve, an inner layer sleeve, an end cover, a connecting clamp block and a header.

[0020] The outer layer sleeve, the middle layer sleeve and the inner layer sleeve are coaxially nested from outside to inside.

[0021] The outer layer sleeve is provided with a first inlet hole and a plurality of outlet holes on the wall thereof. The first inlet hole is located at the lower part of the outer layer sleeve. The first inlet hole is connected with the inlet pipe. The middle layer sleeve is provided with a second inlet hole on the wall thereof. The inner layer sleeve is provided with a third inlet hole on the wall thereof. The first inlet hole, the second inlet hole and the third inlet hole are sequentially communicated.

[0022] The upper and lower ends of the outer sleeve are respectively sealed by end caps, and the hollow inner cavity of the inner sleeve constitutes a rectifying section, and the third inlet hole is communicated with the rectifying section.

[0023] The middle sleeve is provided with a plurality of hollow grooves, and the hollow grooves cooperate with the inner wall of the outer sleeve and the outer wall of the inner sleeve to form liquid distribution channels, and the inlet and outlet of each liquid distribution channel are respectively located at the two ends of the liquid distribution channel; the side wall of the inner sleeve is provided with a through hole, and the inlet of each liquid distribution channel is communicated with the through hole; the inlet of the groove is located at the upper part of the middle sleeve and is communicated with the rectifying section; the outlet of the groove is communicated with the outlet hole of the outer sleeve.

[0024] The outlet hole of the outer sleeve is communicated with the header through a connecting clamp, and the header is provided with a partition plate at every interval inside the header, the partition plate divides the header into a plurality of independent chambers, each chamber corresponds to a connecting clamp, and one or more flat tubes are inserted into each chamber. The flat tube has a plurality of microchannels inside.

[0025] The two-phase refrigerant enters the rectifying section in sequence from the inlet pipe, the first inlet hole, the second inlet hole, and the third inlet hole, rises, enters the grooves of the middle sleeve through the through holes of the inner sleeve, and then flows out of the outlet hole of the outer sleeve. The refrigerant enters the independent chambers inside the header through the connecting clamp, and then enters the internal microchannels of the flat tubes inserted into the chambers, thereby completing the uniform distribution of the two-phase refrigerant.

[0026] Further, the upper and lower ends of the header are sealed by plugs; and the outer sleeve, the middle sleeve, and the inner sleeve are coaxially nested and then brazed.

[0027] Further, the inner diameter of the outer sleeve is equal to or slightly larger than the outer diameter of the middle sleeve, and the inner diameter of the middle sleeve is equal to or slightly larger than the outer diameter of the inner sleeve, facilitating nested assembly.

[0028] Further, the plurality of through holes formed in the side wall of the inner sleeve are of the same size and are uniformly distributed along the circumference of the inner sleeve, thereby ensuring that the refrigerant in the distribution chamber uniformly enters each groove.

[0029] In a third aspect, the application further provides a microchannel heat exchanger, which is characterized in that it comprises the above-mentioned sleeve liquid distribution structure.

[0030] Advantages of the application:

[0031] The gas-liquid distribution device provided by the application has the advantages of simple process, easy manufacturing, and low processing cost; the built-in rectifying section makes the structure compact, and the stability and uniformity of the gas-liquid two-phase fluid distribution are good; the outlet of the distribution device can be communicated with the inlet of a copper tube heat exchanger or a microchannel heat exchanger, and the number of heat exchange branches and the wind field distribution can be adapted to the heat exchange environment through structural algorithms, which has universality. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a structure diagram of the outer sleeve;

[0033] Figure 2 is a combination diagram of the sleeves;

[0034] Figure 3 is a structure diagram of the sleeve;

[0035] Figure 4 is Figure 3 is a structure diagram of the outer sleeve;

[0036] Figure 5 is a structure diagram of the middle sleeve;

[0037] Figure 6 is a structure diagram of another middle sleeve;

[0038] Figure 7 is a combination diagram of another sleeve;

[0039] Figure 8 is Figure 7 is a structure diagram of the middle sleeve in the structure.

[0040] As shown in the figure: inlet pipe 1, outer sleeve 2, middle sleeve 3, inner sleeve 4, end cap 5, connecting clamp block 6, header 7, plug cap 8, partition plate 9, flat pipe 10, first inlet hole 201, outlet hole 202, distribution cavity 203, second inlet hole 301, channel 302, third inlet hole 401, rectifier section 402. DETAILED DESCRIPTION

[0041] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application.

[0042] Example 1

[0043] Referring to Figure 1 , a sleeve liquid distribution structure includes an inlet pipe 1, an outer sleeve 2, a middle sleeve 3, an inner sleeve 4, an end cap 5, a connecting clamp block 6, and a header 7.

[0044] Referring to Figures 1-5The outer layer sleeve 2, the middle layer sleeve 3 and the inner layer sleeve 4 are coaxially nested from outside to inside. The outer layer sleeve 2 is provided with a first inlet hole 201 and a plurality of outlet holes 202 on the wall thereof, and the number of the outlet holes 202 is set according to actual needs. In the embodiment, the number of the outlet holes 202 is eight.

[0045] The first inlet hole 201 is located at the lower part of the outer layer sleeve 2, and the first inlet hole 201 is connected with the inlet pipe 1. The middle layer sleeve 3 is provided with a second inlet hole 301 on the wall thereof, and the inner layer sleeve 4 is provided with a third inlet hole 401 on the wall thereof. The first inlet hole 201, the second inlet hole 301 and the third inlet hole 401 are sequentially communicated.

[0046] The upper and lower ends of the outer layer sleeve 2 are respectively sealed by end caps 5. The hollow inner cavity of the inner layer sleeve 4 constitutes a rectifying section 402, and the third inlet hole 401 is communicated with the rectifying section 402. The top of the inner layer sleeve 4 is lower than the top of the outer layer sleeve 2, so that a distribution cavity 203 is formed between the top of the inner layer sleeve 4 and the end cap 5 at the upper end.

[0047] The middle layer sleeve 3 is provided with a plurality of hollow grooves 302, and the number of the grooves 302 is the same as that of the outlet holes 202 of the outer layer sleeve 2.

[0048] The hollow grooves 302, the inner wall of the outer layer sleeve 2 and the outer wall of the inner layer sleeve 4 cooperatively form distribution flow paths. The two ends of each distribution flow path are respectively an inlet and an outlet, and each distribution flow path is independent of each other. The inlet of the groove 302 is located at the top of the middle layer sleeve 3 and is communicated with the distribution cavity 203. The outlet of the groove 302 corresponds to and is communicated with the outlet hole 202 of the outer layer sleeve 2.

[0049] The outlet hole 202 of the outer layer sleeve 2 is communicated with the manifold 7 through the connecting clamp block 6. A baffle 9 is arranged in the manifold 7 at intervals. The baffle 9 divides the manifold 7 into a plurality of independent chambers. Each chamber corresponds to one connecting clamp block 6, and one or more flat tubes 10 are inserted into each chamber. The flat tube has a plurality of micro-channels inside.

[0050] The two-phase refrigerant enters from the inlet pipe, sequentially passes through the first inlet hole, the second inlet hole and the third inlet hole, and enters the rectifying section. In the rectifying section, the two-phase refrigerant flows upward to the distribution cavity. The distribution cavity is communicated with the groove inlets of the middle layer sleeve, and the refrigerant is uniformly distributed into each groove. The refrigerant flows along the grooves to the outlet holes of the outer layer sleeve. The refrigerant enters the independent chambers in the manifold from the outlet holes through the connecting clamp blocks, and then enters the micro-channels in the flat tubes inserted into the chambers, thereby completing the uniform distribution of the two-phase refrigerant.

[0051] In some embodiments provided in the present aspect, the inlet of each channel 302 is of the same size and uniformly distributed along the circumference, thereby ensuring that the refrigerant in the distribution cavity 203 uniformly enters each channel 302.

[0052] In some embodiments provided in the present aspect, the outer sleeve 2, the middle sleeve 3 and the inner sleeve 4 are coaxially nested and then brazed, thereby ensuring the sealing of the liquid distribution flow path formed after the coaxial nesting.

[0053] In some embodiments provided in the present aspect, the inner diameter of the outer sleeve 2 is equal to or slightly larger than the outer diameter of the middle sleeve 3, and the inner diameter of the middle sleeve 3 is equal to or slightly larger than the outer diameter of the inner sleeve 4, thereby facilitating the nested assembly.

[0054] In some embodiments provided in the present aspect, Figure 6 Another structural diagram of the middle sleeve 3 is provided, which is different from the middle sleeve 3 in Figure 5 only in that the path of the channel flow path of the middle sleeve 3 is different.

[0055] Embodiment 2

[0056] Referring to Figure 7 and Figure 8 , a sleeve liquid distribution structure, which is different from Embodiment 1 in that the distribution cavity is integrated into the top of the rectifying section.

[0057] Specifically, the inlet of the channel 302 on the middle sleeve 3 is located at the upper part of the middle sleeve 3, the side wall of the inner sleeve 4 is provided with a through hole, and the inlet of each liquid distribution flow path is communicated with the rectifying section 402 through a through hole; the outlet of the channel 302 is communicated with the outlet hole 202 of the outer sleeve 2. Two-phase refrigerant enters the rectifying section in sequence from the inlet pipe, the first inlet hole, the second inlet hole and the third inlet hole, rises, enters the channel of the middle sleeve through the through hole of the inner sleeve, and then flows out of the outlet hole of the outer sleeve. The refrigerant enters the independent chamber in the header through the connecting clamp block, and then enters the internal microchannel of the inserted flat tube in the chamber, thereby completing the uniform distribution of the two-phase refrigerant.

[0058] In some embodiments provided in the present aspect, the eight through holes provided in the side wall of the inner sleeve 4 are of the same size and uniformly distributed along the circumference of the inner sleeve 4.

[0059] The above-mentioned sleeve liquid distribution structures all take the equal distribution of flow into eight branches as an example, and similarly, structures for equally distributing flow into any number of branches can be designed by using the ideas provided in the present application.

[0060] The present application also provides a microchannel heat exchanger comprising any of the above-mentioned sleeve liquid distribution structures, and thus the microchannel heat exchanger also has all the functions and effects of the above-mentioned sleeve liquid distribution structures, which will not be described here.

[0061] The above merely illustrates the embodiments of the present application, but does not limit the protection scope of the present application, and any equivalent structure or equivalent flow transformation made according to the content of the present application specification and drawings, or direct or indirect application in other related system fields, are also included in the protection scope of the present application.

Claims

1. A sleeve-type liquid separation structure, characterized in that: It includes an inlet pipe (1), an outer sleeve (2), a middle sleeve (3), an inner sleeve (4), an end cap (5), a connecting clamp (6), and a manifold (7); The outer sleeve (2), the middle sleeve (3), and the inner sleeve (4) are coaxially nested from the outside to the inside; The outer sleeve (2) has a first inlet hole (201) and several outlet holes (202) on its wall. The first inlet hole (201) is located at the lower part of the outer sleeve (2). The first inlet hole (201) is connected to the inlet pipe (1). The middle sleeve (3) has a second inlet hole (301) on its wall, and the inner sleeve (4) has a third inlet hole (401) on its wall. The first inlet hole (201), the second inlet hole (301), and the third inlet hole (401) are connected in sequence. The upper and lower ends of the outer sleeve (2) are sealed by end caps (5), and the hollow inner cavity of the inner sleeve (4) forms a rectifier section (402). The third inlet hole (401) is connected to the rectifier section (402). The top of the inner sleeve (4) is lower than the top of the outer sleeve (2), so that a distribution cavity (203) is formed between the top of the inner sleeve (4) and the upper end cap (5). The middle sleeve (3) is provided with several hollow channels (302). The hollow channels (302) cooperate with the inner wall of the outer sleeve (2) and the outer wall of the inner sleeve (4) to form a liquid distribution path. The two ends of each liquid distribution path are the inlet and the outlet, respectively. The inlet of the channel (302) is located at the top of the middle sleeve (3) and is connected to the distribution cavity (203). The outlet of the channel (302) is connected to the outlet hole (202) of the outer sleeve (2). The outlet hole (202) of the outer sleeve (2) is connected to the manifold (7) through the connecting clamp (6). The manifold (7) is provided with partitions (9) at intervals. The partitions (9) divide the manifold (7) into several independent chambers. Each chamber corresponds to a connecting clamp (6). One or more flat tubes (10) are inserted in each chamber.

2. The sleeve-type liquid distribution structure according to claim 1, characterized in that: The inlet dimensions of each channel (302) are the same and are evenly distributed circumferentially.

3. The sleeve-type liquid distribution structure according to claim 2, characterized in that: The upper and lower ends of the manifold (7) are fitted with caps (8) for sealing.

4. The sleeve-type liquid distribution structure according to claim 3, characterized in that: The outer sleeve (2), middle sleeve (3), and inner sleeve (4) are coaxially nested and then brazed.

5. The sleeve-type liquid distribution structure according to claim 4, characterized in that: The inner diameter of the outer sleeve (2) is equal to or slightly larger than the outer diameter of the middle sleeve (3), and the inner diameter of the middle sleeve (3) is equal to or slightly larger than the outer diameter of the inner sleeve (4).

6. A sleeve-type liquid separation structure, characterized in that: It includes an inlet pipe (1), an outer sleeve (2), a middle sleeve (3), an inner sleeve (4), an end cap (5), a connecting clamp (6), and a manifold (7); The outer sleeve (2), the middle sleeve (3), and the inner sleeve (4) are coaxially nested from the outside to the inside; The outer sleeve (2) has a first inlet hole (201) and several outlet holes (202) on its wall. The first inlet hole (201) is located at the lower part of the outer sleeve (2). The first inlet hole (201) is connected to the inlet pipe (1). The middle sleeve (3) has a second inlet hole (301) on its wall, and the inner sleeve (4) has a third inlet hole (401) on its wall. The first inlet hole (201), the second inlet hole (301), and the third inlet hole (401) are connected in sequence. The upper and lower ends of the outer sleeve (2) are sealed by end caps (5), and the hollow inner cavity of the inner sleeve (4) forms a rectifier section (402). The third inlet hole (401) is connected to the rectifier section (402). The middle sleeve (3) is provided with several hollow channels (302). The hollow channels (302) cooperate with the inner wall of the outer sleeve (2) and the outer wall of the inner sleeve (4) to form a liquid distribution path. The two ends of each liquid distribution path are the inlet and the outlet, respectively. The side wall of the inner sleeve (4) has through holes. The inlet of each liquid distribution path is connected to a through hole. The inlet of the channel (302) is located at the upper part of the middle sleeve (3) and is connected to the rectifier section (402). The outlet of the channel (302) is connected to the outlet hole (202) of the outer sleeve (2). The outlet hole (202) of the outer sleeve (2) is connected to the manifold (7) through the connecting clamp (6). The manifold (7) is provided with partitions (9) at intervals. The partitions (9) divide the manifold (7) into several independent chambers. Each chamber corresponds to a connecting clamp (6). One or more flat tubes (10) are inserted in each chamber.

7. The sleeve-type liquid distribution structure according to claim 6, characterized in that: The upper and lower ends of the manifold (7) are sealed with plugs (8); the outer sleeve (2), the middle sleeve (3), and the inner sleeve (4) are coaxially nested and then brazed.

8. The sleeve-type liquid distribution structure according to claim 7, characterized in that: The inner diameter of the outer sleeve (2) is equal to or slightly larger than the outer diameter of the middle sleeve (3), and the inner diameter of the middle sleeve (3) is equal to or slightly larger than the outer diameter of the inner sleeve (4).

9. A sleeve-type liquid distribution structure according to claim 8, characterized in that: The inner sleeve (4) has several through holes of the same size on its sidewall, which are evenly distributed along the circumference of the inner sleeve (4).

10. A microchannel heat exchanger, characterized in that: Includes the sleeve-type liquid distribution structure as described in any one of claims 1-9.

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