A manifold structure and micro-channel heat exchanger

Abstract

The application discloses a manifold liquid distribution structure and a micro-channel heat exchanger, and the manifold liquid distribution structure comprises an inlet pipe, a liquid distribution manifold, a manifold and a flat pipe; the liquid distribution manifold comprises an inner core, a top end cover, a bottom end cover, an outer pipe and a partition plate; the outer pipe is provided with a plurality of partition plate grooves and outlet holes on a side wall, the inner core is coaxially arranged in the inner portion of the outer pipe, the partition plate divides the space between the outer pipe and the inner core into a plurality of independent chambers, each chamber corresponds to an outer pipe outlet hole, and the top end cover and the bottom end cover are used for sealing the upper and lower ends of the outer pipe respectively; the inlet pipe is communicated with the bottom of the inlet hole through a penetrating hole, the manifold comprises a flat pipe groove, one end of the flat pipe groove is communicated with the outer pipe outlet hole through an entering hole, and one end of the flat pipe is inserted into the flat pipe groove. The manifold liquid distribution structure and the micro-channel heat exchanger provided by the application adopt the manifold to form a liquid distribution flow path, and utilize flow path arrangement to keep the local resistance of the distribution points consistent, so that good liquid distribution uniformity is realized.

Description

TECHNICAL FIELD

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

[0002] The micro-channel heat exchanger is a high-efficiency and compact heat exchanger, which mainly consists of flat tubes with multiple micro-channels and manifolds for distribution and convergence. At the inlet of the evaporator, the refrigerant is usually in a gas-liquid two-phase state. When the liquid distribution of the micro-channel heat exchanger is uneven, the branch with less liquid distribution will appear dry and overheating, and the branch with more liquid distribution will appear liquid at the outlet, thus it is difficult to exert the heat exchange capacity. In order to improve the performance of the micro-channel heat exchanger, it is essential to set a reasonable liquid distribution, and the design of the liquid distribution structure often needs to consider the complexity, process difficulty, production cost and other aspects.

[0003] The existing liquid distribution structure of the micro-channel heat exchanger has the following shortcomings:

[0004] 1. The traditional external distributor is maturely applied in copper tube heat exchangers, but the number of flat tubes of the micro-channel heat exchanger is large, and the structure is complex and the cost is high after using the external distributor, which is not conducive to the compression space and the formation of integrated liquid distribution structure.

[0005] 2. Setting the liquid distribution structure on the manifold of the micro-channel heat exchanger can realize integrated distribution, but the limited space and complex process become the main limitation of practical application. SUMMARY

[0006] Therefore, the present application provides a manifold liquid distribution structure and a micro-channel heat exchanger, which uses a manifold to form a liquid distribution flow path, and uses flow path arrangement to keep the local resistance of the distribution point consistent, thereby realizing better liquid distribution uniformity.

[0007] In order to solve the above problems, the embodiments of the present application provide a manifold liquid distribution structure and a micro-channel heat exchanger, which are characterized in that:

[0008] The manifold liquid distribution structure comprises an inlet pipe, a liquid distribution manifold, a manifold and a flat tube.

[0009] The liquid distribution manifold comprises an inner core, a top end cover, a bottom end cover, an outer pipe and a partition plate.

[0010] The outer pipe comprises a tubular structure, a plurality of partition plate grooves and outlet holes are formed in the side wall of the tubular structure, the inner core is coaxially arranged in the inner part of the outer pipe, the partition plate is inserted into the partition plate groove to separate the space between the outer pipe and the inner core into a plurality of independent chambers, each chamber corresponds to an outer pipe outlet hole, and the top end cover and the bottom end cover are respectively used to seal the upper and lower ends of the outer pipe.

[0011] The inner core includes a cylindrical structure, with an inlet hole and n levels of channels axially upwards. The holes of each level of channels are symmetrical about the axis of the inner core.

[0012] The upper end of the first-level channel is connected to the inlet hole through a diversion channel on the lower surface of the top end cap. Even-numbered channels are connected to the previous channel through a diversion channel on the upper surface of the bottom end cap. Odd-numbered channels after the first level are connected to the previous channel through a diversion channel on the lower surface of the top end cap. Each through hole of the nth-level channel is connected to the outside of the inner core through a radial hole, and each radial hole corresponds to an independent chamber.

[0013] The channels on both the top and bottom end caps are symmetrical about their central axis.

[0014] The inlet pipe is connected to the bottom of the inlet hole through a through hole. The manifold includes a body structure with a flat tube groove on it. One end of the flat tube groove is connected to the outlet hole of the outer pipe through an inlet hole. One end of the flat tube is inserted into the flat tube groove, and the flat tube has several microchannels inside.

[0015] In some embodiments, the manifold has an arc surface on the side where the inlet hole is located, allowing it to be directly fitted with the outer pipe.

[0016] In some embodiments, the inlet hole penetrates the main body structure of the manifold, the flat tube groove is connected to the inlet hole, one end of the inlet hole is connected to the outlet hole of the outer tube, and the other end of the inlet hole is blocked by a side plate.

[0017] In some embodiments, the inner core is provided with secondary channels. The first-level channels include four channels, and the second-level channels include eight channels. The eight radial channels are located on the side of the inner core and are distributed in a spiral upward pattern. The axial spacing between adjacent radial channels is the same.

[0018] The flow cross-sectional area of ​​the inlet orifice is greater than or equal to that of the first-stage channel, and the flow cross-sectional area of ​​the first-stage channel is greater than or equal to that of the second-stage channel.

[0019] The top end cap's diversion channel includes a channel inlet, which is connected to four channel outlets respectively. The channel inlet is connected to the inlet hole of the inner core, and each channel outlet is connected to the top of one of the first-stage channels.

[0020] The bottom end cap's distribution channels include four primary channel inlets and eight primary channel outlets. Each primary channel inlet corresponds to two primary channel outlets. Each primary channel inlet is connected to the bottom of one channel of the first-level channel, and each primary channel outlet is connected to the bottom of one channel of the second-level channel of the inner core.

[0021] In some embodiments, the inner core is provided with secondary channels. The first-level channel includes two channels, and the second-level channel includes eight channels. The eight radial holes are located on the side of the inner core and are distributed in a spiral upward pattern. The axial spacing between adjacent radial holes is the same.

[0022] The flow cross-sectional area of ​​the inlet orifice is greater than or equal to that of the first-stage channel, and the flow cross-sectional area of ​​the first-stage channel is greater than or equal to that of the second-stage channel.

[0023] The top end cap's diversion channel includes a channel inlet, which is connected to two channel outlets respectively. The channel inlet is connected to the inlet hole of the inner core, and each channel outlet is connected to the top of one of the first-stage channels respectively.

[0024] The bottom end cap's distribution channels include two primary channel inlets and eight primary channel outlets. Each primary channel inlet corresponds to four primary channel outlets. Each primary channel inlet is connected to the bottom of one channel of the first-level channel, and each primary channel outlet is connected to the bottom of one channel of the second-level channel of the inner core.

[0025] In some embodiments, the inner core is provided with three levels of channels. The first level of channels includes two channels, the second level of channels includes four channels, and the third level of channels includes eight channels. The eight radial holes are located on the side of the inner core and are distributed in a spiral upward pattern. The axial spacing between adjacent radial holes is the same.

[0026] The flow cross-sectional area of ​​the inlet orifice is greater than or equal to that of the first-level channel, the flow cross-sectional area of ​​the first-level channel is greater than or equal to that of the second-level channel, and the flow cross-sectional area of ​​the second-level channel is greater than or equal to that of the third-level channel.

[0027] The top end cap's diversion channel includes one channel inlet and four secondary channel inlets. The inlet hole of the inner core is connected to two channel outlets through the channel inlets, and each channel outlet is connected to the top of one of the first-stage channels. Each secondary channel inlet is connected to two secondary channel outlets.

[0028] The bottom end cap's distribution channels include two primary channel inlets and four primary channel outlets. Each primary channel inlet corresponds to two primary channel outlets. Each primary channel inlet is connected to the bottom of one channel in the first-level channel, and each primary channel outlet is connected to the bottom of one channel in the second-level channel of the inner core.

[0029] Each of the second-level channels is connected to an inlet of a secondary channel, and each outlet of a secondary channel is connected to the top of a third-level channel.

[0030] In some embodiments, the inner core is provided with secondary channels. The first-level channel includes two channels, and the second-level channel includes four channels. The four radial holes are located on the side of the inner core and are distributed in a spiral upward pattern. The spacing between adjacent radial holes in the vertical direction is the same.

[0031] The flow cross-sectional area of ​​the inlet orifice is greater than or equal to that of the first-stage channel, and the flow cross-sectional area of ​​the first-stage channel is greater than or equal to that of the second-stage channel.

[0032] The top end cap's diversion channel includes a channel inlet, which is connected to two channel outlets respectively. The channel inlet is connected to the inlet hole of the inner core, and each channel outlet is connected to the top of one of the first-stage channels respectively.

[0033] The bottom end cap's distribution channels include two primary channel inlets and four primary channel outlets. Each primary channel inlet corresponds to two primary channel outlets. Each primary channel inlet is connected to the bottom of one channel of the first-level channel, and each primary channel outlet is connected to the bottom of one channel of the second-level channel of the inner core.

[0034] In some embodiments, the inner core is provided with a primary channel, which includes four channels. The four radial holes are located on the side of the inner core and are distributed in a spiral upward pattern. The spacing between adjacent radial holes in the vertical direction is the same.

[0035] The flow cross-sectional area of ​​the inlet orifice is greater than or equal to that of the first-stage channel;

[0036] The top end cap's distribution channel includes a channel inlet, which is connected to four channel outlets. The channel inlet is connected to the inlet hole of the inner core, and each channel outlet is connected to the top of a channel of the primary hole.

[0037] In addition, this invention also proposes a microchannel heat exchanger, which is special in that:

[0038] This includes the aforementioned manifold liquid distribution structure.

[0039] Compared with the prior art, the manifold liquid distribution structure and microchannel heat exchanger of the present invention have at least the following beneficial effects:

[0040] 1. The liquid distribution flow path arrangement of the present invention ensures that the local resistance at the distribution point remains consistent, thereby achieving better liquid distribution uniformity.

[0041] 2. The porous inner core and the channels on the end cap work together to form a liquid distribution path. Different flow paths can be formed by changing the arrangement of the holes and the shape of the channels, making the design scheme flexible.

[0042] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This invention provides a manifold liquid distribution structure that enables 8-channel liquid distribution;

[0045] Figure 2 for Figure 1 Structural diagram of the central manifold;

[0046] Figure 3 for Figure 1 Structural diagram of the inner and outer tubes;

[0047] Figure 4 for Figure 1 Structural diagram of the inner core;

[0048] Figure 5 for Figure 1 Structural diagram of the inner core, partition, top end cap, and bottom end cap;

[0049] Figure 6 This invention provides a second liquid distribution manifold structure for achieving 8-channel liquid distribution;

[0050] Figure 7 The present invention provides a third liquid distribution manifold structure for realizing 8-way liquid distribution;

[0051] Figure 8 A diagram of a liquid distribution manifold structure for realizing four-way liquid distribution is provided by the present invention;

[0052] Figure 9 This invention provides a second liquid distribution manifold structure for achieving four-way liquid distribution;

[0053] Figure 10 The diagram shows a third type of liquid distribution manifold structure for achieving four-way liquid distribution, as provided by the present invention.

[0054] The attached figures are labeled as follows:

[0055] 1. Inlet pipe, 2. Inner core, 3. Top end cap, 4. Bottom end cap, 5. Outer pipe, 6. Partition, 7. Manifold, 8. Flat pipe, 201. Inlet hole, 202. First-stage channel, 203. Second-stage channel, 204. Radial hole, 209. Channel inlet, 301. Channel outlet, 302. Second-stage channel inlet, 303. Second-stage channel outlet, 304. Through hole, 401. First-stage channel inlet, 402. First-stage channel outlet, 403. Partition groove, 501. Outlet hole, 502. Inlet hole, 701. Flat pipe groove, 702. Detailed Implementation

[0056] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the specific embodiments, structures, features, and effects according to the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0057] In the description of this invention, it should be clearly stated that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; the terms "vertical," "lateral," "longitudinal," "front," "rear," "left," "right," "up," "down," "horizontal," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are merely for the convenience of describing this invention, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this invention.

[0058] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0059] Example 1

[0060] This embodiment provides a manifold liquid distribution structure, see [link]. Figures 1-4 It includes an inlet pipe 1, a liquid distribution manifold, a manifold 7, and a flat pipe 8. The liquid distribution manifold includes an inner core 2, a top end cap 3, a bottom end cap 4, an outer pipe 5, and a partition 6.

[0061] The outer tube 5 includes a tubular structure with several partition grooves 501 and outlet holes 502 on its side wall. The inner core 2 is coaxially disposed inside the outer tube 5. The partition 6 is inserted into the partition groove 501 to divide the space between the outer tube 5 and the inner core 2 into multiple independent chambers. Each chamber corresponds to an outer tube outlet hole 502. The top end cap 3 and the bottom end cap 4 are used to seal the upper and lower ends of the outer tube 5, respectively.

[0062] The inner core 2 comprises a cylindrical structure, with an inlet hole 201 and n-level channels. The n-level channels include several through holes. Both the inlet hole 201 and the n-level channels are axially arranged through holes, and the holes of each level of channel are symmetrical about the axis of the inner core 2. The upper end of the first-level channel is connected to the inlet hole 201 through a diversion channel on the lower surface of the top end cover 3. Even-numbered channels are connected to the previous level channel through a diversion channel on the upper surface of the bottom end cover 4. Odd-numbered channels after the first level are connected to the previous level channel through a diversion channel on the lower surface of the top end cover 3. Each through hole of the n-level channel is connected to the outside of the inner core 2 through a radial hole 209, and each radial hole 209 corresponds to an independent chamber. The channels on the top end cover 3 and the bottom end cover 4 are symmetrical about their respective axes.

[0063] The inlet pipe 1 is connected to the bottom of the inlet hole 201 through the through hole 401. The manifold 7 includes a body structure with a flat tube groove 702. One end of the flat tube groove 702 is connected to the outer tube outlet hole 502 through the inlet hole 701. One end of the flat tube 8 is inserted into the flat tube groove 702, and the flat tube 8 has several microchannels inside.

[0064] See Figure 2 In a preferred embodiment of the present invention, the manifold 7 has an arc surface on the side where the inlet hole 701 is provided, which can be directly attached to the cylindrical outer wall of the outer pipe 5.

[0065] See Figure 2 In a preferred embodiment of the present invention, the inlet hole 701 penetrates the main body structure of the manifold 7, the flat tube groove 702 is connected to the inlet hole 701, one end of the inlet hole 701 is connected to the outer tube outlet hole 502, and the other end of the inlet hole 701 is blocked by the side plate 703.

[0066] Example 2

[0067] See Figures 1-5 This embodiment provides a manifold structure for achieving 8-channel liquid distribution, including an inlet pipe 1, a distribution manifold, a header 7, and a flat pipe 8. The distribution manifold includes an inner core 2, a top end cap 3, a bottom end cap 4, an outer pipe 5, and a partition 6.

[0068] The outer tube 5 includes a tubular structure with several partition grooves 501 and outlet holes 502 on its side wall. The inner core 2 is coaxially disposed inside the outer tube 5. The partition 6 is inserted into the partition groove 501 to divide the space between the outer tube 5 and the inner core 2 into eight independent chambers. Each chamber corresponds to an outer tube outlet hole 502. The top end cap 3 and the bottom end cap 4 are used to seal the upper and lower ends of the outer tube 5, respectively.

[0069] The inner core 2 comprises a cylindrical structure, and is provided with an inlet hole 201 and secondary channels. The first-level channel 202 comprises four channels, which are symmetrical about the axis of the inner core (2). The second-level channel 203 comprises eight channels, which are symmetrical about the axis of the inner core (2). Eight radial holes 209 are located on the side of the inner core 2 and are spirally distributed upwards, with adjacent radial holes 209 having the same vertical spacing. The inlet hole 201 is located at the center of the inner core 2, and the second-level holes are on the outermost side and evenly distributed circumferentially. The flow cross-sectional area of ​​the inlet hole 201 is greater than or equal to that of the first-level channel 202, and the flow cross-sectional area of ​​the first-level channel 202 is greater than or equal to that of the second-level channel 203.

[0070] The top end cap 3 has a distribution channel including a channel inlet 301, which is connected to four channel outlets 302. The channel inlet 301 is connected to the inlet hole 201 of the inner core 2, and each channel outlet 302 is connected to the top of one of the first-stage channels 202. The distribution channel of the top end cap 3 is symmetrical about the central axis of the top end cap 3.

[0071] The flow channels of the bottom end cap 4 include four primary channel inlets 402 and eight primary channel outlets 403. Each primary channel inlet 402 corresponds to two primary channel outlets 403. Each primary channel inlet 402 is connected to the bottom of one channel of the first-level channel 202, and each primary channel outlet 403 is connected to the bottom of one channel of the second-level channel 203 of the inner core 2. The flow channels are symmetrical about the central axis of the bottom end cap 4. Each radial hole 209 corresponds to an independent chamber. The flow channels of the bottom end cap 4 are symmetrical about the central axis of the bottom end cap 4.

[0072] The inlet pipe 1 is connected to the bottom of the inlet hole 201 through the through hole 401. The manifold 7 includes a body structure with a flat tube groove 702. One end of the flat tube groove 702 is connected to the outer tube outlet hole 502 through the inlet hole 701. One end of the flat tube 8 is inserted into the flat tube groove 702, and the flat tube 8 has several microchannels inside.

[0073] During operation, the refrigerant enters through the inlet pipe 1, first flowing through the through hole 401 of the bottom end cap 4, then entering the inlet hole 201 of the inner core 2 and flowing upwards. Upon reaching the bottom, it enters the channel inlet 301 of the top end cap 3, and is evenly distributed to the channel outlets 302. From the channel outlet 302, the refrigerant enters the first-stage channel 202 of the inner core 2 and flows downwards. Upon reaching the bottom, it enters the first-stage channel inlet 402 of the bottom end cap 4, and is evenly distributed to the first-stage channel outlets 403. From the first-stage channel outlet 403, the refrigerant enters the second-stage channel 203 of the inner core 2 and flows upwards, exiting through the outlet hole 209 of the inner core 2 during its flow. After exiting, the refrigerant enters the independent chamber formed by the outer pipe 5 and the partition 6, and then flows out from the outlet hole 502 of the outer pipe 5. The outlet hole 502 is connected to the inlet hole 701 of the manifold 7. After entering the manifold 7, the refrigerant flows into the various microchannels of the flat pipe 8, thus completing the refrigerant distribution. Because the local resistance at each split point during the flow process remains the same, good liquid separation uniformity can be achieved.

[0074] Example 3

[0075] See Figure 6 This embodiment provides a liquid distribution structure for an 8-channel liquid distribution manifold. The difference between this embodiment and Embodiment 2 is that:

[0076] The inner core 2 is provided with a secondary channel. The first-level channel 202 includes two channels, and the second-level channel 203 includes eight channels. The eight radial holes 209 are located on the side of the inner core 2 and are distributed in a spiral upward shape. The vertical spacing of adjacent radial holes 209 is the same.

[0077] The top end cap 3 has a channel for diverting water, which includes a channel inlet 301. The channel inlet 301 is connected to two channel outlets 302. The channel inlet 301 is connected to the inlet hole 201 of the inner core 2. Each channel outlet 302 is connected to the top of one of the first-level channels 202. The bottom end cap 4 has a channel for diverting water, which includes two first-level channel inlets 402 and eight first-level channel outlets 403. Each first-level channel inlet 402 corresponds to four first-level channel outlets 403. Each first-level channel inlet 402 is connected to the bottom of one of the first-level channels 202. Each first-level channel outlet 403 is connected to the bottom of one of the second-level channels 203 of the inner core 2.

[0078] The refrigerant is first divided into two equal streams in the channel of the top end cover 3, and then divided into four equal streams in the channel of the bottom end cover 4, ultimately achieving eight streams of liquid distribution.

[0079] Example 3

[0080] See Figure 7This embodiment provides a liquid distribution structure for an 8-channel liquid distribution manifold. The difference between this embodiment and Embodiment 2 is that:

[0081] The inner core 2 is provided with three levels of channels. The first level channel 202 includes two channels, the second level channel 203 includes four channels, and the third level channel 204 includes eight channels. The eight radial holes 209 are located on the side of the inner core 2 and are distributed in a spiral upward shape. The vertical spacing of adjacent radial holes 209 is the same.

[0082] The flow cross-sectional area of ​​the inlet hole 201 is greater than or equal to that of the first-stage channel 202, the flow cross-sectional area of ​​the first-stage channel 202 is greater than or equal to that of the second-stage channel 203, and the flow cross-sectional area of ​​the second-stage channel 203 is greater than or equal to that of the third-stage channel 204. The diversion channel of the top end cover 3 includes one channel inlet 301 and four secondary channel inlets 303. The inlet hole 201 of the inner core 2 is connected to two channel outlets 302 through the channel inlets 301, and each channel outlet 302 is connected to the top of one channel of the first-stage channel 202. Each secondary channel inlet 303 is connected to two secondary channel outlets 204. The first-stage channel outlet 304 is connected; the diversion channel of the bottom end cover 4 includes two first-stage channel inlets 402 and four first-stage channel outlets 403. Each first-stage channel inlet 402 corresponds to two first-stage channel outlets 403. Each first-stage channel inlet 402 is connected to the bottom of one channel of the first-stage channel 202. Each first-stage channel outlet 403 is connected to the bottom of one channel of the second-stage channel 203 of the inner core 2. Each channel of the second-stage channel 203 is connected to a second-stage channel inlet 303. Each second-stage channel outlet 304 is connected to the top of a third-stage channel 204.

[0083] The refrigerant is first divided into two equal streams in the channel of the top end cover 3, then divided into two equal streams in the channel of the bottom end cover 4, and finally returned to the channel of the top end cover 3 to be divided into two equal streams, thus achieving 8-stream liquid distribution.

[0084] Example 4

[0085] See Figure 8 This embodiment provides a liquid distribution structure for a 4-way liquid distribution manifold. The difference between this embodiment and Embodiment 2 is that:

[0086] The inner core 2 is provided with a secondary channel. The first-level channel 202 includes two channels, and the second-level channel 203 includes four channels. The four radial holes 209 are located on the side of the inner core 2 and are spirally distributed upwards. The vertical spacing of adjacent radial holes 209 is the same. The flow cross-sectional area of ​​the inlet hole 201 is greater than or equal to that of the first-level channel 202, and the flow cross-sectional area of ​​the first-level channel 202 is greater than or equal to that of the second-level channel 203. The diversion channel of the top end cover 3 includes a channel inlet 301, which is connected to two channel outlets 302 respectively. The channel inlet 301 is connected to the inlet hole 201 of the inner core 2, and each channel outlet 302 is connected to the top of one channel of the first-level channel 202 respectively.

[0087] The flow channel of the bottom end cover 4 includes two primary channel inlets 402 and four primary channel outlets 403. Each primary channel inlet 402 corresponds to two primary channel outlets 403. Each primary channel inlet 402 is connected to the bottom of one channel of the first-level channel 202, and each primary channel outlet 403 is connected to the bottom of one channel of the second-level channel 203 of the inner core 2.

[0088] The refrigerant is first divided into two equal streams in the channel of the top end cover 3, and then divided into two equal streams in the channel of the bottom end cover 4, thus achieving four-stream liquid distribution.

[0089] Example 5

[0090] See Figure 9 This embodiment provides a liquid distribution structure for a 4-way liquid distribution manifold. The difference between this embodiment and Embodiment 2 is that:

[0091] The inner core 2 is provided with a first-level channel 202, which includes four channels. Four radial holes 209 are located on the side of the inner core 2 and are spirally distributed upwards. The vertical spacing of adjacent radial holes 209 is the same. The flow cross-sectional area of ​​the inlet hole 201 is greater than or equal to that of the first-level channel 202. The diversion channel of the top end cover 3 includes a channel inlet 301, which is connected to the four channel outlets 302 respectively. The channel inlet 301 is connected to the inlet hole 201 of the inner core 2, and each channel outlet 302 is connected to the top of one channel of the first-level channel 202.

[0092] The refrigerant is directly divided into four equal streams in the channel of the top end cover 3, thereby achieving four-stream liquid distribution.

[0093] In this invention, the inlet hole 201 of the inner core 2 and the holes of each level of channels can be circular holes or holes of other shapes, such as... Figure 10The liquid distribution structure shown is similar to that in Example 4. The refrigerant is directly divided into four equal streams in the channel of the top end cap 3, thus achieving liquid distribution in four streams. However, the cross-section of each level of channel is changed to a fan-shaped structure, and the channel of the bottom end cap 4 is set as an annular channel.

[0094] Similarly, the ideas provided by this invention can be used to design a structure that evenly distributes traffic across n paths, which will not be listed here one by one.

[0095] Example 6

[0096] A microchannel heat exchanger includes the aforementioned manifold liquid distribution structure. Thus, the microchannel heat exchanger also contains all the functions and effects of the aforementioned manifold liquid distribution structure, which will not be elaborated here.

[0097] It will be readily understood by those skilled in the art that, without conflict, the aforementioned advantageous technical features can be freely combined and superimposed.

[0098] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A manifold liquid distribution structure, characterized in that: It includes an inlet pipe (1), a liquid distribution manifold, a manifold (7), and a flat pipe (8); The liquid distribution manifold includes an inner core (2), a top end cap (3), a bottom end cap (4), an outer tube (5), and a partition (6); The outer tube (5) includes a tubular structure with several partition grooves (501) and outlet holes (502) on its side wall. The inner core (2) is coaxially arranged inside the outer tube (5). The partition (6) is inserted into the partition groove (501) to divide the space between the outer tube (5) and the inner core (2) into multiple independent chambers. Each chamber corresponds to an outer tube outlet hole (502). The top end cap (3) and the bottom end cap (4) are used to seal the upper and lower ends of the outer tube (5), respectively. The inner core (2) includes a cylindrical structure. The inner core (2) is provided with an inlet hole (201) and n-level channels in the axial direction. The holes of each level of channel are symmetrical about the axis of the inner core (2). The upper end of the first-level channel is connected to the inlet hole (201) through the diversion channel on the lower surface of the top end cap (3). The even-numbered channels are connected to the previous channel through the diversion channel on the upper surface of the bottom end cap (4). The odd-numbered channels after the first level are connected to the previous channel through the diversion channel on the lower surface of the top end cap (3). Each through hole of the nth-level channel is connected to the outside of the inner core (2) through a radial hole (209). Each radial hole (209) corresponds to an independent chamber. The channels on the top end cap (3) and the bottom end cap (4) are symmetrical about their central axis. The inlet pipe (1) is connected to the bottom of the inlet hole (201) through the through hole (401). The manifold (7) includes a body structure, on which a flat tube groove (702) is provided. One end of the flat tube groove (702) is connected to the outlet hole (502) of the outer pipe through the inlet hole (701). One end of the flat tube (8) is inserted into the flat tube groove (702), and the flat tube (8) has several microchannels inside.

2. The manifold liquid distribution structure according to claim 1, characterized in that: The manifold (7) has an arc surface on the side where the inlet hole (701) is located, which can be directly attached to the outer pipe (5).

3. The manifold liquid distribution structure according to claim 2, characterized in that: The inlet hole (701) penetrates the main body structure of the manifold (7), the flat tube groove (702) is connected to the inlet hole (701), one end of the inlet hole (701) is connected to the outlet hole (502) of the outer tube, and the other end of the inlet hole (701) is blocked by the side plate (703).

4. The manifold liquid distribution structure according to any one of claims 1-3, characterized in that: The inner core (2) is provided with a secondary channel. The first-level channel (202) includes four channels, and the second-level channel (203) includes eight channels. The eight radial holes (209) are located on the side of the inner core (2) and are distributed in a spiral upward pattern. The axial spacing of adjacent radial holes (209) is the same. The flow cross-sectional area of ​​the inlet hole (201) is greater than or equal to that of the first-stage channel (202), and the flow cross-sectional area of ​​the first-stage channel (202) is greater than or equal to that of the second-stage channel (203). The top end cap (3) has a channel for diverting water, which includes a channel inlet (301), the channel inlet (301) is connected to four channel outlets (302) respectively, the channel inlet (301) is connected to the inlet hole (201) of the inner core (2), and each channel outlet (302) is connected to the top of one of the channels of the first-level channel (202); The bottom end cap (4) has a diversion channel including four primary channel inlets (402) and eight primary channel outlets (403). Each primary channel inlet (402) corresponds to two primary channel outlets (403). Each primary channel inlet (402) is connected to the bottom of one channel of the first-level channel (202), and each primary channel outlet (403) is connected to the bottom of one channel of the second-level channel (203).

5. The manifold liquid distribution structure according to any one of claims 1-3, characterized in that: The inner core (2) is provided with a secondary channel. The first-level channel (202) includes two channels, and the second-level channel (203) includes eight channels. The eight radial holes (209) are located on the side of the inner core (2) and are distributed in a spiral upward pattern. The axial spacing of adjacent radial holes (209) is the same. The flow cross-sectional area of ​​the inlet hole (201) is greater than or equal to that of the first-stage channel (202), and the flow cross-sectional area of ​​the first-stage channel (202) is greater than or equal to that of the second-stage channel (203). The top end cap (3) has a channel for diverting water, which includes a channel inlet (301), the channel inlet (301) is connected to two channel outlets (302) respectively, the channel inlet (301) is connected to the inlet hole (201) of the inner core (2), and each channel outlet (302) is connected to the top of one of the channels of the first-stage channel (202); The bottom end cap (4) has two primary channel inlets (402) and eight primary channel outlets (403). Each primary channel inlet (402) corresponds to four primary channel outlets (403). Each primary channel inlet (402) is connected to the bottom of one channel of the first-level channel (202), and each primary channel outlet (403) is connected to the bottom of one channel of the second-level channel (203).

6. The manifold liquid distribution structure according to any one of claims 1-3, characterized in that: The inner core (2) is provided with three levels of channels. The first level channel (202) includes two channels, the second level channel (203) includes four channels, and the third level channel (204) includes eight channels. The eight radial holes (209) are located on the side of the inner core (2) and are distributed in a spiral upward shape. The axial spacing of adjacent radial holes (209) is the same. The flow cross-sectional area of ​​the inlet hole (201) is greater than or equal to that of the first-level channel (202), the flow cross-sectional area of ​​the first-level channel (202) is greater than or equal to that of the second-level channel (203), and the flow cross-sectional area of ​​the second-level channel (203) is greater than or equal to that of the third-level channel (204). The top end cap (3) has a diversion channel including a channel inlet (301) and four secondary channel inlets (303). The inlet hole (201) of the inner core (2) is connected to two channel outlets (302) through the channel inlet (301). Each channel outlet (302) is connected to the top of one channel of the first-stage channel (202). Each secondary channel inlet (303) is connected to two secondary channel outlets (304). The flow channel of the bottom end cap (4) includes two primary channel inlets (402) and four primary channel outlets (403). Each primary channel inlet (402) corresponds to two primary channel outlets (403). Each primary channel inlet (402) is connected to the bottom of one channel of the first-level channel (202), and each primary channel outlet (403) is connected to the bottom of one channel of the second-level channel (203). Each channel of the second-level channel (203) is connected to a secondary channel inlet (303), and each secondary channel outlet (304) is connected to the top of a third-level channel (204).

7. The manifold liquid distribution structure according to any one of claims 1-3, characterized in that: The inner core (2) is provided with a secondary channel. The first-level channel (202) includes two channels, and the second-level channel (203) includes four channels. The four radial holes (209) are located on the side of the inner core (2) and are spirally distributed upwards. The axial spacing of adjacent radial holes (209) is the same. The flow cross-sectional area of ​​the inlet hole (201) is greater than or equal to that of the first-stage channel (202), and the flow cross-sectional area of ​​the first-stage channel (202) is greater than or equal to that of the second-stage channel (203). The top end cap (3) has a channel for diverting water, which includes a channel inlet (301), the channel inlet (301) is connected to two channel outlets (302) respectively, the channel inlet (301) is connected to the inlet hole (201) of the inner core (2), and each channel outlet (302) is connected to the top of one of the channels of the first-stage channel (202); The flow channel of the bottom end cap (4) includes two primary channel inlets (402) and four primary channel outlets (403). Each primary channel inlet (402) corresponds to two primary channel outlets (403). Each primary channel inlet (402) is connected to the bottom of one channel of the first-level channel (202), and each primary channel outlet (403) is connected to the bottom of one channel of the second-level channel (203).

8. The manifold liquid distribution structure according to any one of claims 1-3, characterized in that: The inner core (2) is provided with a first-level channel (202), which includes four channels. Four radial holes (209) are located on the side of the inner core (2) and are spirally distributed upwards. The axial spacing of adjacent radial holes (209) is the same. The flow cross-sectional area of ​​the inlet hole (201) is greater than or equal to that of the first-stage channel (202); The top end cap (3) has a channel for diverting water, which includes a channel inlet (301). The channel inlet (301) is connected to four channel outlets (302) respectively. The channel inlet (301) is connected to the inlet hole (201) of the inner core (2). Each channel outlet (302) is connected to the top of one of the channels of the primary channel (202).

9. The manifold liquid distribution structure according to any one of claims 1-3, characterized in that: The cross-section of each channel on the inner core (2) is circular or irregular.

10. A microchannel heat exchanger, characterized in that: Includes the manifold liquid distribution structure as described in any one of claims 1-8.

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