Flat plate liquid distribution structure and micro-channel heat exchanger

Abstract

This invention discloses a flat plate liquid distribution structure and a microchannel heat exchanger. The flat plate liquid distribution structure includes an inlet pipe, a manifold, a flat tube, and at least two flat plates. The at least two flat plates are stacked sequentially to form a multi-layer flat plate structure. Channels are provided on the mating surface of at least one flat plate, and these channels are closed to form several flow distribution units. Each flow distribution unit includes one or two inlet holes and two... n A flow path is formed by a channel from the inlet hole to the outlet hole, with all flow paths having equal lengths. The inlet pipe is connected to the inlet hole. The manifold includes a body structure with a flat tube groove. One end of the flat tube groove is connected to the outlet hole of the distribution unit through an inlet hole. The other end of the flat tube is inserted into the flat tube groove. This invention provides a flat plate liquid distribution structure and a microchannel heat exchanger, which uses stacked flat plates to form a liquid distribution flow path. The arrangement of the flow path ensures that the local resistance and friction resistance remain consistent, thereby achieving better liquid distribution uniformity.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of refrigeration technology, and relates to a flat plate 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 comprises a flat tube with multiple micro-channels and a header 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, so it is difficult to exert the heat exchange capacity of the micro-channel heat exchanger. In order to improve the performance of the micro-channel heat exchanger, it is necessary 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 micro-channel heat exchanger liquid distribution structure has the following disadvantages:

[0004] 1. The traditional external distributor is mature in application 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 the external distributor is used, which is not conducive to the compression space and the formation of an integrated liquid distribution structure.

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

[0006] Therefore, the present application provides a flat plate liquid distribution structure and a micro-channel heat exchanger, which mainly uses flat plates to form a liquid distribution flow path, and uses the arrangement of the flow path to keep the local resistance and the resistance along the path consistent, so as to realize good liquid distribution uniformity.

[0007] In order to solve the above problems, the embodiment of the present application provides a flat plate liquid distribution structure, which is characterized in that:

[0008] The flat plate liquid distribution structure comprises an inlet pipe, a header, a flat tube and at least two flat plates,

[0009] The at least two flat plates are sequentially laminated to form a multi-layer flat plate structure, and a groove is arranged on the bonding surface of at least one flat plate, and the groove is closed to form a plurality of distribution units; each distribution unit comprises one to two inlet holes and two n outlet holes, the groove from the inlet hole to the outlet hole forms a flow path, and the lengths of all flow paths are equal,

[0010] The inlet pipe is communicated with the inlet hole, the header comprises a body structure, and the body structure is provided with a flat tube groove; one end of the flat tube groove is communicated with the outlet hole of the distribution unit through an entering hole; one end of the flat tube is inserted into the flat tube groove, and the flat tube has a plurality of micro-channels inside.

[0011] In some embodiments, the number of the flat plates is two; the channels of the flow splitting unit are located on the bonding surface of one of the flat plates, or the channels of the flow splitting unit are located on the bonding surfaces of the two flat plates respectively, and the channels on the two surfaces are symmetrically arranged.

[0012] In some embodiments, each flow splitting unit comprises an inlet hole, the inlet hole is communicated with a first two-way port through a first channel, two outlets of the first two-way port are connected with a second channel respectively, the end of the second channel is communicated with a second two-way port, two outlets of the second two-way port are connected with a third channel respectively, and the end of the third channel is an outlet hole.

[0013] In one flow splitting unit, the first channel and the second channel are perpendicular to each other at the position of the first two-way port to ensure that the local resistance of the two-way port is the same; the second channel and the third channel are perpendicular to each other at the position of the second two-way port to ensure that the local resistance of the two-way port is the same. 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 third channel.

[0014] In some embodiments, each flow splitting unit comprises an inlet hole, the inlet hole is communicated with a first two-way port through a first channel, two outlets of the first two-way port are connected with a second channel respectively, the end of the second channel is communicated with a second two-way port, two outlets of the second two-way port are connected with a third channel respectively, the end of the third channel is communicated with a third two-way port, two outlets of the third two-way port are connected with a fourth channel respectively, and the end of the fourth channel is an outlet hole.

[0015] In one flow splitting unit, the first channel and the second channel are perpendicular to each other at the position of the first two-way port, the second channel and the third channel are perpendicular to each other at the position of the second two-way port, and the third channel and the fourth channel are perpendicular to each other at the position of the third two-way port. The flow cross-sectional area of the first channel is greater than or equal to the flow cross-sectional area of the second channel, the flow cross-sectional area of the second channel is greater than or equal to the flow cross-sectional area of the third channel, and the flow cross-sectional area of the third channel is greater than or equal to the flow cross-sectional area of the fourth channel.

[0016] In some embodiments, the number of the flat plates is three, and the flat plates are sequentially arranged in the order of a first flat plate, a second flat plate, and a third flat plate; each flow splitting unit comprises two inlet holes located on the two bonding surfaces respectively,

[0017] The channels of the flow splitting unit are located on the bonding surfaces of the first flat plate and the third flat plate, or the channels of the flow splitting unit are located on the two side surfaces of the second flat plate.

[0018] In some embodiments, in one flow splitting unit:

[0019] The inlet hole on the first plate is communicated with the first two-way hole through the first channel, the two outlets of the first two-way hole are connected with a second channel respectively, the end of the second channel is communicated with the second two-way hole, the two outlets of the second two-way hole are connected with a third channel respectively, and the end of the third channel is the outlet hole; the channels of the first plate are rotated by 180° around the horizontal symmetry axis to obtain the third plate;

[0020] The inlet pipe is communicated with the inlet holes of the first plate and the third plate, and the two inlet holes divide the fluid entering from the inlet pipe into two parts;

[0021] In the first plate, the first channel and the second channel are perpendicular to each other at the position of the first two-way hole, the second channel and the third channel are perpendicular to each other at the position of the second two-way hole, 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 third channel.

[0022] In some embodiments, in one flow splitting unit:

[0023] The channels on the two sides of the second plate are centrally symmetric about the horizontal symmetry axis;

[0024] The inlet hole on one side of the second plate is communicated with the first two-way hole through the first channel, the two outlets of the first two-way hole are connected with a second channel respectively, the end of the second channel is communicated with the second two-way hole, the two outlets of the second two-way hole are connected with a third channel respectively, and the end of the third channel is the outlet hole;

[0025] The first channel and the second channel are perpendicular to each other at the position of the first two-way hole, and the second channel and the third channel are perpendicular to each other at the position of the second two-way hole;

[0026] 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 third channel.

[0027] In some embodiments, the number of plates is three, and the plates are sequentially the first plate, the second plate and the third plate in the stacking order, each flow splitting unit includes an inlet hole,

[0028] Part of the channel of the flow splitting unit is located on the bonding surface of the first plate, and the other part is located on the bonding surface of the second plate close to the third plate.

[0029] In some embodiments, in one flow splitting unit:

[0030] The inlet hole on the first plate is communicated with the first two-way hole through the first channel, the two outlets of the first two-way hole are connected with a second channel respectively, the first channel and the second channel are perpendicular to each other at the position of the first two-way hole, and the end of the second channel is the channel port.

[0031] The second plate has two through holes, one end of which is connected to the end port of the second channel.

[0032] The second plate is provided with four third channels. Every two third channels are connected to the other end of a through hole. The end of the third channel is connected to the second two-way opening. The two outlets of the second two-way opening are respectively connected to a fourth channel. The end of the fourth channel is an outlet hole.

[0033] At the through-hole position, the second channel and the third channel are perpendicular to each other; at the second bifurcation position, the third channel and the fourth channel are perpendicular to each other.

[0034] The cross-sectional area of ​​the first channel is greater than or equal to that of the second channel, and the cross-sectional area of ​​the third channel is greater than or equal to that of the fourth channel.

[0035] On the other hand, embodiments of the present invention also provide a microchannel heat exchanger, which is characterized in that:

[0036] It includes any of the above-mentioned flat-plate liquid separation structures.

[0037] Compared with the prior art, the flat plate liquid separation structure and microchannel heat exchanger of the present invention have at least the following beneficial effects:

[0038] 1. The arrangement of the liquid distribution flow path ensures that the local resistance and friction resistance are consistent, thereby achieving better liquid distribution uniformity;

[0039] 2. Grooves are cut into the flat plates, and flow paths are constructed through the stacking of the flat plates, which facilitates processing and assembly.

[0040] 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

[0041] 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.

[0042] Figure 1 This invention provides an 8-channel flat plate liquid dispensing structure;

[0043] Figure 2 This invention provides a flat plate liquid separator with four liquid dispensing channels;

[0044] Figure 3 This invention provides another 8-channel liquid dispensing flat plate dispensing structure;

[0045] Figure 4 This invention provides another 8-channel liquid dispensing flat plate dispensing structure.

[0046] The attached figures are labeled as follows:

[0047] 1. Inlet pipe, 2. Manifold, 3. Flat pipe, 4. First plate, 5. Second plate, 6. Third plate, 7. Inlet hole, 8. Outlet hole, 201. Inlet hole, 202. Flat pipe groove, 203. Side plate, 501. Through hole, 402. First channel, 403. First two-way opening, 404. Second channel, 405. Second two-way opening, 406. Third channel, 407. Third two-way opening, 408. Fourth channel. Detailed Implementation

[0048] 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.

[0049] 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.

[0050] This invention proposes a flat plate liquid distribution structure, comprising an inlet pipe 1, a manifold 2, a flat pipe 3, and at least two flat plates. The flat plates are stacked sequentially to form a multi-layer flat plate structure. A channel is provided on the mating surface of at least one flat plate, and the plates are sealed together by welding. This channel sealing forms several distribution units; each distribution unit includes one or two inlet holes 7 and 2. n There are (n is a positive integer) outlet holes 8, and the channel from the inlet hole 7 to the outlet hole 8 forms a flow path. All flow paths have the same length.

[0051] The inlet pipe 1 is connected to the inlet hole 7. The manifold 2 includes a body structure with a flat tube groove 202. One end of the flat tube groove 202 is connected to the outlet hole 8 of the diversion unit through the inlet hole 201. One end of the flat tube 3 is inserted into the flat tube groove 202, and the flat tube 3 has several microchannels inside.

[0052] This invention utilizes a flat liquid separation structure to evenly divide the fluid entering from inlet pipe 1 into 2 n The fluid is then evenly distributed into manifold 2 to achieve better uniformity of liquid distribution.

[0053] This invention employs a stacked plate structure to form a liquid distribution flow path. The arrangement of the flow path ensures that local resistance and friction resistance remain consistent, thereby achieving better liquid distribution uniformity. The plate-structured liquid distribution system can evenly divide the flow rate into 2... n (2, 4, 8, 16, 32...) paths. The following details the plate liquid separation structure based on the number of plates and the channel paths set on their mating surfaces.

[0054] As a preferred option, see Figure 1 The main body structure of the manifold 2 is a plate, the inlet hole 201 penetrates from the side, the side plate 203 is used to block the other side of the inlet hole 201, and the flat tube groove 202 is connected to the inlet hole 201.

[0055] Example 1

[0056] See Figure 1 A flat plate liquid distribution structure for achieving 8-way liquid distribution includes an inlet pipe 1, a manifold 2, a flat pipe 3, and three flat plates.

[0057] The number of plates is three, which are stacked in the following order: first plate 4, second plate 5, and third plate 6. Each diversion unit includes two inlet holes 7, which are located on two mating surfaces respectively. The channel of the diversion unit is located on the mating surface of the first plate 4 and the third plate 6. Each diversion unit includes two inlet holes 7 and eight outlet holes 8. The channel from the inlet hole 7 to the outlet hole 8 forms a flow path, and all flow paths are of equal length.

[0058] The inlet pipe 1 is connected to the inlet hole 7. The manifold 2 includes a body structure with a flat tube groove 202. One end of the flat tube groove 202 is connected to the outlet hole 8 of the diversion unit through the inlet hole 201. One end of the flat tube 3 is inserted into the flat tube groove 202, and the flat tube 3 has several microchannels inside.

[0059] Specifically, in a split-flow unit:

[0060] The inlet hole 7 on the first plate 4 is connected to the first bifurcation port 403 via the first channel 402. The two outlets of the first bifurcation port 403 are each connected to a second channel 404. The end of the second channel 404 is connected to a second bifurcation port 405. The two outlets of the second bifurcation port 405 are each connected to a third channel 406. The end of the third channel 406 is the outlet hole 8. The inlet pipe 1 is connected to the inlet holes 7 of the first plate 4 and the third plate 6. The two inlet holes 7 split the fluid entering from the inlet pipe 1 into two parts, and the local resistance at the inlet is the same. In the first plate 4, the first channel 402 and the second channel 404 at the first bifurcation port 403 are perpendicular to each other to ensure that the local resistance of the bifurcation port is the same; the second channel 404 and the third channel 406 at the second bifurcation port 405 are perpendicular to each other to ensure that the local resistance of the bifurcation port is the same; the flow cross-sectional area of ​​the first channel 402 is greater than or equal to the flow cross-sectional area of ​​the second channel 404, and the flow cross-sectional area of ​​the second channel 404 is greater than or equal to the flow cross-sectional area of ​​the third channel 406, thereby ensuring that the flow rate after the diversion matches the flow area.

[0061] The third plate 6 can be obtained by rotating the channel of the first plate 4 by 180° around the horizontal axis of symmetry. The outlet holes 8 on the first plate 4 and the third plate 6 are evenly distributed alternately in the vertical direction.

[0062] In a flow splitting unit, when the refrigerant enters the multi-layer plate through the inlet pipe 1, it is divided into two fluid streams at the inlet holes 7 of the two plates. One stream flows through the channel of the first plate 4 to an outlet hole 8, and the other stream flows through the channel of the third plate 6 to an outlet hole 8. Each fluid stream passes through two bi-splitting ports in the channel before reaching the outlet hole. It then enters the manifold 2 and flows into the microchannels in the flat tube, thus completing the refrigerant splitting. In this embodiment, the refrigerant passes through three bi-splitting ports in a flow splitting unit before reaching the outlet hole, ultimately achieving eight-way flow splitting.

[0063] Since the frictional resistance and local resistance of each flow path remain the same during the flow process, good liquid separation uniformity can be achieved.

[0064] Example 2

[0065] This embodiment provides a flat plate liquid distribution structure that realizes 8-channel liquid distribution. It is similar to the structure of Embodiment 1, except that the contact surface of the first plate 4 and the third plate 6 is a plane, and the channels of its diversion unit are arranged on the two sides of the second plate 5. The channels on the two sides of the second plate 5 are symmetrical about its horizontal axis of symmetry.

[0066] Specifically, in a split-flow unit:

[0067] The inlet hole 7 on one side of the second plate 5 is connected to the first bifurcation port 403 via the first channel 402. The two outlets of the first bifurcation port 403 are respectively connected to a second channel 404. The end of the second channel 404 is connected to a second bifurcation port 405. The two outlets of the second bifurcation port 405 are respectively connected to a third channel 406. The end of the third channel 406 is the outlet hole 8. The first channel 402 and the second channel 404 at the position of the first bifurcation port 403 are perpendicular to each other to ensure that the local resistance of the bifurcation port is the same. The second channel 404 and the third channel 406 at the position of the second bifurcation port 405 are perpendicular to each other to ensure that the local resistance of the bifurcation port is the same. The flow cross-sectional area of ​​the first channel 402 is greater than or equal to the flow cross-sectional area of ​​the second channel 404, and the flow cross-sectional area of ​​the second channel 404 is greater than or equal to the flow cross-sectional area of ​​the third channel 406, thereby ensuring that the flow rate after diversion matches the flow area.

[0068] In this embodiment, the refrigerant flows through three bi-splitter ports in a flow splitting unit before reaching the outlet port, ultimately achieving eight-way flow splitting.

[0069] Example 3

[0070] This embodiment provides a flat plate liquid distribution structure for achieving four-way liquid distribution. It shares the same structure as the inlet pipe 1, manifold 2, and flat pipe 3 in Embodiment 1, but differs in that the multi-layer flat plate structure is different. The multi-layer flat plate structure includes two flat plates: a first flat plate 4 and a third flat plate 6. The channels of the distribution unit are located on the sides where the two flat plates meet, and the channels on the two surfaces are symmetrically arranged.

[0071] Specifically, see Figure 2 Each diversion unit includes an inlet hole 7, which is connected to a first bi-port 403 via a first channel 402. The two outlets of the first bi-port 403 are respectively connected to a second channel 404. The end of the second channel 404 is connected to a second bi-port 405. The two outlets of the second bi-port 405 are respectively connected to a third channel 406. The end of the third channel 406 is an outlet hole 8.

[0072] In a flow splitting unit, the first channel 402 and the second channel 404 at the first splitting port 403 are perpendicular to each other to ensure that the local resistance of the splitting ports is the same; the second channel 404 and the third channel 406 at the second splitting port 405 are perpendicular to each other to ensure that the local resistance of the splitting ports is the same; the flow cross-sectional area of ​​the first channel 402 is greater than or equal to the flow cross-sectional area of ​​the second channel 404, and the flow cross-sectional area of ​​the second channel 404 is greater than or equal to the flow cross-sectional area of ​​the third channel 406, thereby ensuring that the flow rate after splitting matches the flow area.

[0073] In this embodiment, the refrigerant flows through two bi-splitter ports in a flow splitting unit before reaching the outlet port, ultimately achieving four-way flow splitting.

[0074] Example 4

[0075] This embodiment provides a flat plate liquid distribution structure that realizes 4-way liquid distribution. It is similar to the structure of embodiment 3, except that the channel of the diversion unit is located on the mating surface of one of the first plate 4 or the third plate 6, and the mating surface of the other plate without the channel is a plane.

[0076] Example 5

[0077] This embodiment provides a flat plate liquid distribution structure that realizes 8-channel liquid distribution. It is similar to the structure of embodiment 3, except that an additional flow distribution structure is added at the end of the third channel 406.

[0078] Specifically, see Figure 3 Each diversion unit includes an inlet hole 7, which is connected to a first bi-port 403 via a first channel 402. The two outlets of the first bi-port 403 are respectively connected to a second channel 404. The end of the second channel 404 is connected to a second bi-port 405. The two outlets of the second bi-port 405 are respectively connected to a third channel 406. The end of the third channel 406 is connected to a third bi-port 407. The two outlets connected to the third bi-port 407 are respectively connected to a fourth channel 408. The end of the fourth channel 408 is an outlet hole 8.

[0079] In a flow splitting unit, the first channel 402 at the first split point 403 is perpendicular to the second channel 404; the second channel 404 at the second split point 405 is perpendicular to the third channel 406; and the third channel 406 at the third split point 407 is perpendicular to the fourth channel 408, to ensure that the local resistance at the split points is the same. The flow cross-sectional area of ​​the first channel 402 is greater than or equal to the flow cross-sectional area of ​​the second channel 404, the flow cross-sectional area of ​​the second channel 404 is greater than or equal to the flow cross-sectional area of ​​the third channel 406, and the flow cross-sectional area of ​​the third channel 406 is greater than or equal to the flow cross-sectional area of ​​the fourth channel 408, thereby ensuring that the flow rate after splitting matches the flow area.

[0080] In this embodiment, the refrigerant flows through three bi-splitter ports in a flow splitting unit before reaching the outlet port, ultimately achieving eight-way flow splitting.

[0081] Of course, in this embodiment, the channel of the diversion unit is located on the mating surface of one of the first plate 4 or the third plate 6, while the mating surface of the other plate without a channel is a plane.

[0082] Example 6

[0083] This embodiment provides a flat plate liquid distribution structure for achieving 8-channel liquid distribution, including an inlet pipe 1, a manifold 2, a flat pipe 3, and three flat plates. The number of flat plates is three, and in the stacking order, they are a first flat plate 4, a second flat plate 5, and a third flat plate 6. Each distribution unit includes an inlet hole 7. Part of the channel of the distribution unit is located on the mating surface of the first flat plate 4, and another part is located on the mating surface of the second flat plate 5 near the third flat plate 6.

[0084] Specifically, see Figure 4 In a split unit:

[0085] The inlet hole 7 on the first plate 4 is connected to the first bifurcation port 403 via the first channel 402. The two outlets of the first bifurcation port 403 are each connected to a second channel 404. The first channel 402 and the second channel 404 at the location of the first bifurcation port 403 are perpendicular to each other to ensure that the local resistance of the bifurcation port is the same. The end of the second channel 404 is the channel port. The total length from the inlet hole 7 to the channel port through any channel is equal to ensure that the friction resistance is the same.

[0086] The second plate 5 has two through holes 501, one end of which is connected to the end port of the second channel 404. The second plate 5 also has four third channels 406, with every two third channels 406 connected to the other end of one through hole 501. The end of each third channel 406 is connected to a second split port 405, and the two outlets of the second split port 405 are each connected to a fourth channel 408, the end of which is an outlet hole 8. The total length from the through hole 501 to the outlet hole 8 through any channel is equal to ensure consistent friction resistance.

[0087] At the position of through hole 501, the second channel 404 and the third channel 406 are perpendicular to each other, and at the position of the second bisection 405, the third channel 406 and the fourth channel 408 are perpendicular to each other; so as to ensure that the local resistance of the bisection is the same.

[0088] The flow cross-sectional area of ​​the first channel 402 is greater than or equal to the flow cross-sectional area of ​​the second channel 404, and the flow cross-sectional area of ​​the third channel 406 is greater than or equal to the flow cross-sectional area of ​​the fourth channel 408, thereby ensuring that the flow rate after diversion matches the flow area.

[0089] In a flow splitting unit, the refrigerant enters the multi-layer flat plate structure through inlet pipe 1, then enters the first flat plate 4 through inlet hole 7. After a first split, it reaches the channel port, and then enters the through hole 501 of the second flat plate 5. It undergoes another split at through hole 501, and then a second split at the second splitting port 405 to reach the outlet hole 8. Subsequently, it enters the manifold 2 and flows into the various microchannels in the flat tube, thus completing the refrigerant splitting. Since the friction resistance and local resistance remain the same during the flow process, good liquid distribution uniformity can be achieved.

[0090] In this embodiment, the refrigerant flows through three bi-splitter ports in a flow splitting unit before reaching the outlet port, ultimately achieving eight-way flow splitting.

[0091] Similarly, the approach provided by this invention can be used to design a system that evenly divides the flow into 2... n The structure includes (2, 4, 8, 16, 32...) lanes. Structures with 16 lanes or more will not be listed here.

[0092] Example 7

[0093] This embodiment proposes a microchannel heat exchanger, including any of the above-described flat plate liquid separation structures. Therefore, this microchannel heat exchanger also possesses all the functions and effects of the aforementioned flat plate liquid separation structures, which will not be elaborated further here.

[0094] 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 flat plate liquid distribution structure, characterized in that: comprising an inlet pipe (1), a header (2), a flat tube (3) and at least two flat plates, the inlet pipe (1) is communicated with an inlet hole (7), the header (2) comprises a body structure, and the body structure is provided with a flat tube groove (202); one end of the flat tube groove (202) is communicated with an outlet hole (8) of a distribution unit through an entering hole (201); one end of the flat tube (3) is inserted into the flat tube groove (202), and the flat tube (3) has a plurality of microchannels inside; the number of the flat plates is two; the groove of the distribution unit is located on the adhering surface of one of the flat plates, or the grooves of the distribution unit are respectively located on the adhering surfaces of the two flat plates, and the grooves on the two surfaces are symmetrically arranged; each distribution unit comprises one inlet hole (7), the inlet hole (7) is communicated with a first two-way hole through a first groove, two outlets of the first two-way hole are respectively connected with a second groove, the end of the second groove is communicated with a second two-way hole, two outlets of the second two-way hole are respectively connected with a third groove, and the end of the third groove is the outlet hole (8); in one distribution unit, the first groove and the second groove are perpendicular to each other at the position of the first two-way hole, and the second groove and the third groove are perpendicular to each other at the position of the second two-way hole; the flow passage cross-sectional area of the first groove is greater than or equal to the flow passage cross-sectional area of the second groove, and the flow passage cross-sectional area of the second groove is greater than or equal to the flow passage cross-sectional area of the third groove.

2. A flat plate liquid distribution structure, characterized in that: comprising an inlet pipe (1), a header (2), a flat tube (3) and at least two flat plates, the inlet pipe (1) is communicated with an inlet hole (7), the header (2) comprises a body structure, and the body structure is provided with a flat tube groove (202); one end of the flat tube groove (202) is communicated with an outlet hole (8) of a distribution unit through an entering hole (201); one end of the flat tube (3) is inserted into the flat tube groove (202), and the flat tube (3) has a plurality of microchannels inside; the number of the flat plates is two; the groove of the distribution unit is located on the adhering surface of one of the flat plates, or the grooves of the distribution unit are respectively located on the adhering surfaces of the two flat plates, and the grooves on the two surfaces are symmetrically arranged; each distribution unit comprises one inlet hole (7), the inlet hole (7) is communicated with a first two-way hole through a first groove, two outlets of the first two-way hole are respectively connected with a second groove, the end of the second groove is communicated with a second two-way hole, two outlets of the second two-way hole are respectively connected with a third groove, the end of the third groove is communicated with a third two-way hole, two outlets of the third two-way hole are respectively connected with a fourth groove, and the end of the fourth groove is the outlet hole (8); in one distribution unit, the first groove and the second groove are perpendicular to each other at the position of the first two-way hole, the second groove and the third groove are perpendicular to each other at the position of the second two-way hole, and the third groove and the fourth groove are perpendicular to each other at the position of the third two-way hole; the flow passage cross-sectional area of the first groove is greater than or equal to the flow passage cross-sectional area of the second groove, the flow passage cross-sectional area of the second groove is greater than or equal to the flow passage cross-sectional area of the third groove, and the flow passage cross-sectional area of the third groove is greater than or equal to the flow passage cross-sectional area of the fourth groove. The flat plates are stacked in sequence to form a multi-layer flat plate structure, and a channel is arranged on the bonding surface of at least one flat plate, the channel is closed to form a plurality of shunt units; each shunt unit includes one to two inlet holes (7) and two outlet holes (8), the channel from the inlet hole (7) to the outlet hole (8) forms a flow path, and the lengths of all flow paths are equal, n ​ ​ ​ ​ ​ ​ ​ ​ ​ The flat plates are stacked in sequence to form a multi-layer flat plate structure, and a channel is arranged on the bonding surface of at least one flat plate, the channel is closed to form a plurality of shunt units; each shunt unit includes one to two inlet holes (7) and two outlet holes (8), the channel from the inlet hole (7) to the outlet hole (8) forms a flow path, and the lengths of all flow paths are equal, n ​ ​ ​ ​ ​ ​ ​ 3. A flat plate liquid distribution structure, characterized in that: comprising an inlet pipe (1), a header (2), a flat tube (3) and at least two flat plates, the inlet pipe (1) is communicated with an inlet hole (7), the header (2) comprises a body structure, and the body structure is provided with a flat tube groove (202); one end of the flat tube groove (202) is communicated with an outlet hole (8) of a distribution unit through an entering hole (201); one end of the flat tube (3) is inserted into the flat tube groove (202), and the flat tube (3) has a plurality of microchannels inside; The flat plates are stacked in sequence to form a multi-layer flat plate structure, and a channel is arranged on the bonding surface of at least one flat plate, the channel is closed to form a plurality of shunt units; each shunt unit includes one to two inlet holes (7) and two outlet holes (8), the channel from the inlet hole (7) to the outlet hole (8) forms a flow path, and the lengths of all flow paths are equal, n ​ the number of the flat plates is three, and the flat plates are sequentially a first flat plate (4), a second flat plate (5) and a third flat plate (6) in a stacking order, each distribution unit comprises two inlet holes (7) located on two adhering surfaces respectively, the groove of the distribution unit is located on the adhering surface of the first flat plate (4) and the third flat plate (6), or the groove of the distribution unit is located on two side surfaces of the second flat plate (5); in one distribution unit: the inlet hole (7) on the first flat plate (4) is communicated with a first two-way hole through a first groove, two outlets of the first two-way hole are connected with a second groove respectively, the end of the second groove is communicated with a second two-way hole, two outlets of the second two-way hole are connected with a third groove respectively, and the end of the third groove is the outlet hole (8); the groove of the first flat plate (4) is rotated by 180° around a horizontal symmetry axis to obtain the third flat plate (6); the inlet pipe (1) is communicated with the inlet hole (7) of the first flat plate (4) and the third flat plate (6), and the two inlet holes (7) divide the fluid entering from the inlet pipe (1) into two parts; in the first flat plate (4), the first groove and the second groove are perpendicular to each other at the position of the first two-way hole, and the second groove and the third groove are perpendicular to each other at the position of the second two-way hole, the flow cross-sectional area of the first groove is greater than or equal to the flow cross-sectional area of the second groove, and the flow cross-sectional area of the second groove is greater than or equal to the flow cross-sectional area of the third groove.

4. A flat plate liquid distribution structure, characterized in that: comprising an inlet pipe (1), a header (2), a flat tube (3) and at least two flat plates, the inlet pipe (1) is communicated with an inlet hole (7), the header (2) comprises a body structure, and the body structure is provided with a flat tube groove (202); one end of the flat tube groove (202) is communicated with an outlet hole (8) of a distribution unit through an entering hole (201); one end of the flat tube (3) is inserted into the flat tube groove (202), and the flat tube (3) has a plurality of microchannels inside; the number of the flat plates is three, and the flat plates are sequentially a first flat plate (4), a second flat plate (5) and a third flat plate (6) in a stacking order, each distribution unit comprises two inlet holes (7) located on two adhering surfaces respectively, The flat plates are stacked in sequence to form a multi-layer flat plate structure, and a channel is arranged on the bonding surface of at least one flat plate, the channel is closed to form a plurality of shunt units; each shunt unit includes one to two inlet holes (7) and two outlet holes (8), the channel from the inlet hole (7) to the outlet hole (8) forms a flow path, and the lengths of all flow paths are equal, n ​ the groove of the distribution unit is located on the adhering surface of the first flat plate (4) and the third flat plate (6), or the groove of the distribution unit is located on two side surfaces of the second flat plate (5); in one distribution unit: the grooves on the two side surfaces of the second flat plate (5) are centrally symmetrical about a horizontal symmetry axis. ​ ​ The inlet hole (7) on one side of the second flat plate (5) is communicated with the first two-way hole through the first channel, the two outlets of the first two-way hole are connected with one second channel respectively, the end of the second channel is communicated with the second two-way hole, the two outlets of the second two-way hole are connected with one third channel respectively, and the end of the third channel is the outlet hole (8); The first channel and the second channel are perpendicular to each other at the position of the first two-way hole; and the second channel and the third channel are perpendicular to each other at the position of the second two-way hole. 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 third channel.

5. A flat plate liquid distribution structure, characterized in that: it comprises an inlet pipe (1), a header (2), a flat pipe (3) and at least two flat plates, The flat plates are stacked in sequence to form a multi-layer flat plate structure, and a channel is arranged on the bonding surface of at least one flat plate, the channel is closed to form a plurality of shunt units; each shunt unit includes one to two inlet holes (7) and two outlet holes (8), the channel from the inlet hole (7) to the outlet hole (8) forms a flow path, and the lengths of all flow paths are equal, n ​ the inlet pipe (1) is communicated with the inlet hole (7), the header (2) comprises a body structure, the body structure is provided with a flat pipe groove (202), one end of the flat pipe groove (202) is communicated with the outlet hole (8) of the flow distribution unit through an entering hole (201), one end of the flat pipe (3) is inserted into the flat pipe groove (202), and the flat pipe (3) has a plurality of microchannels inside; the number of the flat plates is three, and the flat plates are sequentially a first flat plate (4), a second flat plate (5) and a third flat plate (6) in a stacking order, and each flow distribution unit comprises an inlet hole (7); a part of the channel of the flow distribution unit is located on the abutting surface of the first flat plate (4), and another part is located on the abutting surface of the second flat plate (5) close to the third flat plate (6); in one flow distribution unit: the inlet hole (7) on the first flat plate (4) is communicated with the first two-way hole through the first channel, the two outlets of the first two-way hole are connected with one second channel respectively, the first channel and the second channel are perpendicular to each other at the position of the first two-way hole, and the end of the second channel is a channel port; two through holes (501) are arranged on the second flat plate (5), one end of each through hole (501) is communicated with the channel port at the end of the second channel respectively, four third channels are arranged on the second flat plate (5), every two third channels are communicated with the other end of one through hole (501), the end of the third channel is connected with the second two-way hole, the two outlets of the second two-way hole are connected with one fourth channel respectively, and the end of the fourth channel is the outlet hole (8); the second channel and the third channel are perpendicular to each other at the position of the through hole (501); and the third channel and the fourth channel are perpendicular to each other at the position of the second two-way hole; 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 third channel is greater than or equal to the flow cross-sectional area of the fourth channel.

6. A microchannel heat exchanger, characterized in that: it comprises the flat plate liquid distribution structure according to any one of claims 1-5.

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