Microchannel heat exchanger and method of making same

Abstract

The present application relates to heat exchange technology field, provide a kind of microchannel heat exchanger and its processing method.The microchannel heat exchanger includes distributor and heat exchange pipe, and the combination structure of distributor is formed by distributor portion and flow distribution plate portion;Distributor portion is provided with open surface and fluid passage, and the multiple flow distribution small holes that open surface is provided with and communicated with fluid passage, flow distribution plate portion has brazing surface with solder layer, and brazing surface is provided with several concave flow distribution cavities, and heat exchange pipe is inserted in the heat exchange pipe insertion hole of flow distribution cavity bottom and is communicated with flow distribution cavity;Open surface and brazing surface are bonded and brazed, and flow distribution cavity is communicated with fluid passage by flow distribution small hole.The microchannel heat exchanger provided by the present application can improve heat exchange efficiency, and can also improve pressure capacity, reduce working substance filling amount and save material.The processing method provided by the present application uses stamping stretching, electric spark opening and one-time brazing forming process, and is suitable for mass production of the aforementioned microchannel heat exchanger.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange, in particular to a micro-channel heat exchanger and a processing method thereof. BACKGROUND

[0002] During the operation of the micro-channel heat exchanger, circulating working medium needs to be distributed from the inner cavity of the distributor to the plurality of flat tubes connected thereto for heat exchange. With the gradual popularization of the micro-channel heat exchanger mainly processed by aluminum, the existing scheme still has the following technical difficulties: on the one hand, the existing distributor structure generally punches a hole on the wall surface of the tube body with a circular or "D" shape in cross section, and the end of the heat exchange flat tube is inserted into the hole for brazing. On the other hand, the existing distributor structure cannot ensure that the circulating working medium is evenly distributed to all heat exchange flat tubes during the distribution process, especially in the evaporation heat exchange process of gas-liquid phase change medium, which is prone to cause uneven heat exchange in each region of the heat exchanger. SUMMARY

[0003] The present application provides a micro-channel heat exchanger to solve the problem of uneven heat exchange of the prior art micro-channel heat exchanger, which leads to low heat exchange efficiency, large volume, low pressure bearing, large filling amount and high processing difficulty.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] A micro-channel heat exchanger, comprising a distributor and a heat exchange tube, the distributor is a combined structure composed of a distributor tube part and a flow distribution plate part, the distributor tube part is provided with an opening surface and a fluid passage, the opening surface is provided with a plurality of flow distribution small holes communicating with the fluid passage, the flow distribution plate part has a brazing surface with a solder layer, the brazing surface is provided with a plurality of concave flow distribution cavities, the bottom of each flow distribution cavity is provided with a heat exchange tube insertion hole, the heat exchange tube is inserted into the heat exchange tube insertion hole to communicate with the flow distribution cavity, the opening surface is attached to the brazing surface and brazed, and the flow distribution cavity communicates with the fluid passage through the plurality of flow distribution small holes.

[0006] Further, the brazing surface is further provided with a plurality of baffle grooves, the baffle grooves communicate two adjacent flow distribution cavities; two or more adjacent heat exchange tubes are connected in series through the flow distribution cavities and the baffle grooves to form a multi-flow heat exchange structure.

[0007] Further, the flow passage diameter of a group of heat exchange tubes constituting the multi-flow heat exchange structure increases in turn along the medium flow direction.

[0008] Further, the distributor tube part further comprises a first distributor interface and a second distributor interface, the fluid passage is a porous tube structure and at least comprises a first porous tube and a second porous tube, wherein the end of the first porous tube forms the first distributor interface, and the end of the second porous tube forms the second distributor interface.

[0009] Further, fins are brazed on the heat exchange surface of the heat exchange tube, the heat exchange tube comprises a first heat exchange tube and a second heat exchange tube, the first heat exchange tube, the fins and the second heat exchange tube are arranged alternately and fixed by brazing, and the first heat exchange tube and the second heat exchange tube are adapted to exchange heat through the fins; the first heat exchange tube flows through the flow uniformizing cavity and the flow uniformizing small hole and communicates with the first hole tube, and the second heat exchange tube flows through the flow uniformizing cavity and the flow uniformizing small hole and communicates with the second hole tube, so as to form a three-medium heat exchanger structure.

[0010] Preferably, the distribution pipe part has two positioning side plates located on both sides of the opening surface, and the flow uniformizing plate part is clamped between the two positioning side plates.

[0011] Further, the flow uniformizing plate part has two brazing flanges located on both sides of the brazing surface, and the brazing flanges are covered by the positioning side plates.

[0012] Further, the positioning side plates are further provided with grooves, and the edge portions on both sides of the flow uniformizing plate part are adapted to be inserted into the grooves to realize positioning and fixing of the flow uniformizing plate part.

[0013] Preferably, the flow uniformizing plate part further has two brazing flanges located on both sides of the brazing surface, and the distribution pipe part is clamped between the two brazing flanges.

[0014] The application further discloses a processing method for industrial production of the micro-channel heat exchanger.

[0015] The processing method of the application comprises the following steps:

[0016] Step 1: a flow uniformizing small hole is punched on the opening surface of the distribution pipe part produced by an extrusion profile process by using an electric spark discharge punching process or a mechanical drilling process; a concave flow uniformizing cavity and a heat exchange tube insertion hole are formed on a plate material with a solder layer by using a drawing stamping process;

[0017] Step 2: each heat exchange tube is respectively inserted into a heat exchange tube insertion hole;

[0018] Step 3: the opening surface of the distribution pipe part is attached to the brazing surface of the flow uniformizing plate part to complete assembly of the heat exchanger;

[0019] Step 4: the assembled heat exchanger is placed into a brazing furnace to complete brazing sealing.

[0020] Based on the above technical solution, the application has the following advantages:

[0021] The micro-channel heat exchanger of the present application adopts the orifice plate flow-distributing structure to precisely distribute the flow of heat exchange medium in each heat exchange tube, and can realize uniform and efficient heat exchange; the small-diameter fluid channel structure can reduce the volume of the heat exchanger, improve the pressure-bearing capacity, reduce the working medium filling amount, and save processing materials.

[0022] The processing method of the present application adopts stamping stretching, electric spark hole opening, assembling and one-time furnace brazing to complete the processing of the micro-channel heat exchanger, and is mature, simple and convenient, and has high production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0024] Figure 1 It is a main body structure sectional view of a micro-channel heat exchanger according to embodiment 1 of the present application;

[0025] Figure 2 It is a main body structure side view of a micro-channel heat exchanger according to embodiment 1 of the present application;

[0026] Figure 3 It is a flow distributor sectional view of a micro-channel heat exchanger according to embodiment 1 of the present application;

[0027] Figure 4 It is a flow distributor sectional view of a micro-channel heat exchanger according to embodiment 1 of the present application;

[0028] Figure 5 It is a flow distributor sectional view of a micro-channel heat exchanger according to embodiment 1 of the present application;

[0029] Figure 6 It is a flow distributor sectional view of a micro-channel heat exchanger according to embodiment 1 of the present application;

[0030] Figure 7 It is a flow distributor sectional view of a micro-channel heat exchanger according to embodiment 2 of the present application;

[0031] Figure 8 It is a flow distributor sectional view of a micro-channel heat exchanger according to embodiment 2 of the present application;

[0032] Figure 9 It is a main body structure side view of a micro-channel heat exchanger according to embodiment 3 of the present application;

[0033] Figure 10A micro-channel heat exchanger according to the embodiment 3 of the present application is shown in the sectional view of the header section;

[0034] Figure 11 A micro-channel heat exchanger according to the embodiment 3 of the present application is shown in the sectional view of the flow distribution plate section;

[0035] Figure 12 A micro-channel heat exchanger according to the embodiment 3 of the present application is shown in the sectional view of the flow distribution plate section;

[0036] Figure 13 A micro-channel heat exchanger according to the embodiment 4 of the present application is shown in the sectional view of the main body structure;

[0037] Figure 14 A micro-channel heat exchanger according to the embodiment 5 of the present application is shown in the sectional view of the main body structure;

[0038] Reference signs:

[0039] 1: header section; 10: open surface; 100: flow distribution small hole;

[0040] 11: fluid passage; 111: first hole pipe; 112: second hole pipe;

[0041] 12: positioning side plate; 120: groove; 2: flow distribution plate section;

[0042] 20: brazing surface; 21: flow distribution cavity; 210: heat exchange pipe insertion hole;

[0043] 23: baffle groove; 31: first header interface; 32: second header interface;

[0044] 41: first heat exchange pipe; 42: second heat exchange pipe; 5: fin. DETAILED DESCRIPTION

[0045] In order to more clearly illustrate the technical solutions of the present application, further description is made in combination with specific embodiments as follows:

[0046] The present application provides a micro-channel heat exchanger embodiment 1, as shown in Figure 1 、 2 and 3, Figure 1 is a vertical flat tube structure heat exchanger, Figure 2 is a horizontal flat tube structure heat exchanger, Figure 3 is a sectional view of the header of the heat exchanger; it should be noted that the left, right, up, down and other directions in the following description of the embodiment 1 are all with respect to Figure 1The embodiment 1 is described as follows: it comprises an upper and a lower set of flow distributors and a plurality of heat exchange tubes 41, the flow distributor is a combined structure composed of a flow distributor part 1 and a flow equalizing plate part 2, the flow distributor part 1 is provided with an open surface 10 and a fluid passage 11, the open surface 10 is provided with a plurality of flow equalizing small holes 100 communicating with the fluid passage 11, the flow distributor part 1 is provided with two positioning side plates 12 respectively located at two sides of the open surface 10, and the flow equalizing plate part 2 is clamped between the two positioning side plates 12. The flow equalizing plate part 2 is provided with a brazing surface 20 with a solder layer, the brazing surface 20 is provided with a plurality of concave flow equalizing cavities 21, each flow equalizing cavity 21 is provided with a heat exchange tube insertion hole 210, the heat exchange tube is inserted and brazed in the heat exchange tube insertion hole 210, the heat exchange tube is in communication with the flow equalizing cavity 21, the open surface 10 is brazed with the brazing surface 20, and the flow equalizing cavity 21 is in communication with the fluid passage 11 through one or a group of flow equalizing small holes 100.

[0047] During the heat exchange operation of the heat exchanger with the structure of the embodiment 1, the heat exchange medium enters the fluid passage 11 of the flow distributor part of the lower flow distributor, is distributed into the flow equalizing cavities 21 through different flow equalizing small holes 100, then flows into the flow equalizing cavities 21 of the flow distributor part 1 of the upper flow distributor after heat exchange with the medium outside the heat exchange tube 41, and finally enters the fluid passage 11 of the upper flow distributor through the flow equalizing small holes 100, thereby realizing the single-pass heat exchange process.

[0048] In the structure of the embodiment 1, the heat exchange tube 41 only needs to be inserted into the heat exchange tube insertion hole 210 and brazed and sealed, the heat exchange tube 41 can realize the communication with the fluid passage 11 of the upper and lower flow distributors through the flow equalizing cavity 21 and the flow equalizing small hole 100, and the heat exchange tube 41 does not need to be directly inserted into the fluid passage 11, so that the fluid passage 11 can only meet the total flow and flow resistance requirements of the heat exchange medium to be designed into a small-sized flow channel, and the small-sized fluid passage 11 also has the advantages of high pressure bearing, small filling amount and cost saving.

[0049] In the structure of the embodiment 1, according to the heat exchange parameters of the heat exchange tube 41, the number or size of the flow equalizing small hole 100 communicating with each flow equalizing cavity 21 can be controlled to meet the requirements of the flow uniformity of the plurality of heat exchange tubes 41, thereby improving the heat exchange efficiency of the heat exchanger.

[0050] The embodiment 2 of the micro-channel heat exchanger is provided, as shown in Figure 7 and 8 The main structure of the micro-channel heat exchanger is basically the same as that of the embodiment 1, and the same parts are not described here again, and the difference lies in that the fluid passage 11 in the embodiment 2 is a porous tube structure.

[0051] In the structure of the embodiment 2, the fluid passage 11 adopts the porous tube structure, on the one hand, the pressure-bearing strength of the fluid passage 11 is further increased, the thickness of the tube wall is effectively reduced, and the material cost is saved; on the other hand, the flow-equalizing small holes 100 can be arranged on different holes, the flow-equalizing cavities 21 are communicated with the plurality of holes through the corresponding flow-equalizing small holes 100, and the opening shape, size and number of the flow-equalizing small holes 100 corresponding to each flow-equalizing cavity 21 can be designed and adjusted, so that the flow distribution is more accurate.

[0052] The application further provides an embodiment 3 of the micro-channel heat exchanger, as shown in Figure 9 、 10 , 11 and 12, the main structure of the micro-channel heat exchanger is substantially the same as that of the embodiment 2, and the difference lies in that the heat exchanger of the embodiment 3 comprises a left manifold, a first group of heat exchange tubes 41, a second group of heat exchange tubes 42 and a right manifold, the fluid passage 11 of the left manifold is a double-hole tube structure, the left manifold further has a first manifold interface 31 and a second manifold interface 32, and the left manifold further has two rows of flow-equalizing small holes 100, one row of flow-equalizing small holes 100 is communicated with the first manifold interface 31 through the first hole tube 111 of the fluid passage 11, and the other row of flow-equalizing small holes 100 is communicated with the second manifold interface 32 through the second hole tube 112 of the fluid passage 11; the embodiment 3 further comprises a baffle groove 23 between two adjacent flow-equalizing cavities 21 of the right manifold, the first group of heat exchange tubes 41 is connected with the second group of heat exchange tubes 42 through the baffle groove 23, and a double-flow heat exchange structure is formed.

[0053] During the heat exchange operation of the heat exchanger of the embodiment 3, the heat exchange medium enters the first hole tube 111 of the fluid passage 11 of the left manifold from the first manifold interface 31 of the left manifold, the flow-equalizing small holes 100 communicated with the first hole tube 111, the flow-equalizing cavities 21 and the first heat exchange tube 41, and after completing the first heat exchange process with the medium outside the tube in the first heat exchange tube 41, the heat exchange medium flows into the flow-equalizing cavity 21 of the right manifold, then flows into the other flow-equalizing cavity 21 adjacent to the flow-equalizing cavity 21 through the baffle groove 23, and then reversely flows into the second heat exchange tube 42, and after completing the second heat exchange process with the medium outside the tube in the second heat exchange tube 42, the heat exchange medium enters the second hole tube 112 of the fluid passage 11 of the left manifold through the other row of flow-equalizing small holes 100 of the left manifold, and finally flows out from the second manifold interface 32, so that the double-flow heat exchange process is realized.

[0054] In the embodiment 3, the passage structures of the first heat exchange tube 41 and the second heat exchange tube 42 are different, one kind is that the thickness of the first heat exchange tube 41 is less than the thickness of the second heat exchange tube 42, so that the flow resistance of the second heat exchange tube 42 is less than the flow resistance of the first heat exchange tube 41; the other kind of passage structure is as shown in Figure 12As shown, the thickness of the first heat exchange tube 41 is the same as that of the second heat exchange tube 42, but the pass is different; the third channel structure is as follows: the first heat exchange tube 41 and the second group of heat exchange tubes 42 are heat exchange tubes of the same size structure, but the number of the first heat exchange tubes 41 of the first heat exchange process is less than that of the second heat exchange tubes 42 of the second heat exchange process.

[0055] Briefly, those skilled in the art can construct more process heat exchanger structures according to the structural principle of the present embodiment 3.

[0056] In the structure of the present embodiment 3, two or more adjacent heat exchange tubes are connected in series through the baffle groove 23, so that the circulating working medium can be folded in the corresponding multi-process heat exchange structure, thereby accurately controlling the flow of the circulating working medium in the heat exchange tubes of different processes of the heat exchanger, reducing the flow resistance of the process, and improving the heat exchange efficiency.

[0057] The present application also provides an embodiment 4 of a micro-channel heat exchanger, as shown in Figure 13 The main structure of the micro-channel heat exchanger is basically the same as that of the embodiment 3, and the difference is that the left and right manifold of the present embodiment 4 are both double-hole tube structures, and both have a first manifold interface 31 and a second manifold interface 32; the left and right manifolds both have two rows of flow-equalizing small holes 100, one row of which communicates with the first manifold interface 31 through the first hole tube 111 of the fluid channel 11, and the other row of which communicates with the second manifold interface 32 through the second hole tube 112 of the fluid channel 11.

[0058] In the present embodiment 4, the first group of heat exchange tubes 41, the fins 5 and the second group of heat exchange tubes 42 are arranged alternately in the up-down direction and fixed by brazing, the first group of heat exchange tubes 41 respectively pass through the flow-equalizing cavity 21, the flow-equalizing small hole 100 and the first hole tube 111 of the fluid channel 11, and communicate with the first manifold interface 31 of the left and right manifolds, and the second group of heat exchange tubes 42 respectively pass through the flow-equalizing cavity 21, the flow-equalizing small hole 100, the second hole tube 112 of the fluid channel 11, and communicate with the second manifold interface 32 of the left and right manifolds, thereby forming a three-medium heat exchanger structure with double channels in the tube.

[0059] In the heat exchange operation of the heat exchanger of this embodiment 4, on the one hand, the first heat exchange medium enters the first hole tube 111 of the fluid passage 11, the flow equalizing small hole 100 in communication with the first hole tube 111, the flow equalizing cavity 21 and the first heat exchange tube 41 from the first distribution interface 31 of the left distribution manifold, and after the heat exchange medium exchanges heat with the medium outside the first heat exchange tube 41, it flows through the flow equalizing cavity 21 of the right distribution manifold, the flow equalizing small hole 100 in communication with the first hole tube 111 and the first hole tube 111 of the fluid passage 11 in turn, and finally flows out from the first distribution interface 31 of the right distribution manifold; on the other hand, the second heat exchange medium enters the second hole tube 112 of the fluid passage 11, the flow equalizing small hole 100 in communication with the second hole tube 112, the flow equalizing cavity 21 and the second heat exchange tube 42 from the second distribution interface 32 of the right distribution manifold, and after the heat exchange medium exchanges heat with the medium outside the second heat exchange tube 42, it flows through the flow equalizing cavity 21 of the left distribution manifold, the flow equalizing small hole 100 in communication with the second hole tube 112 and the second hole tube 112 of the fluid passage 11 in turn, and finally flows out from the second distribution interface 32 of the left distribution manifold. It can be understood that the heat exchanger described in this embodiment 4 can realize the heat exchange process between two kinds of media in the tube and one kind of medium outside the tube.

[0060] The present application also provides an embodiment 5 of a micro-channel heat exchanger, as shown in the figure, the main structure of the micro-channel heat exchanger is basically the same as that of embodiment 4, and the difference lies in that one heat exchange surface in the middle of each first heat exchange tube 41 is in close contact with the heat exchange surface of an adjacent second heat exchange tube 42, and the two end portions of each first heat exchange tube 41 are bent and then inserted into the heat exchange tube insertion hole, thereby forming a three-medium heat exchanger structure that can realize direct heat exchange between two kinds of media. Figure 14

[0061] In the heat exchange operation of the heat exchanger of this embodiment 5 structure, the media in the flow channels of the first heat exchange tube 41 and the second heat exchange tube 42 can not only realize direct heat exchange through the flow channel walls, but also can respectively exchange heat with the third medium outside the tube through the heat exchange surfaces, thereby realizing direct heat exchange between any two kinds of media among the three kinds of media.

[0062] The present application also provides an embodiment 6 of a micro-channel heat exchanger, and the main structure of the micro-channel heat exchanger is basically the same as that of embodiment 1, and the difference lies in that the flow equalizing plate part 2 has two brazing folded edges, and the two brazing folded edges are respectively located on both sides of the brazing surface 20, and the brazing folded edges are covered by the positioning side plate 12.

[0063] The present application also provides an embodiment 7 of a micro-channel heat exchanger, and the main structure of the micro-channel heat exchanger is basically the same as that of embodiment 1, and the difference lies in that the flow equalizing plate part 2 also has two brazing folded edges, and the brazing folded edges are located on both sides of the brazing surface 20, and the distribution manifold part 1 is clamped between the two brazing folded edges.

[0064] ​According to any one of the above embodiments 1 to 7 of the present application, the micro-channel heat exchanger has the following advantages: on the one hand, the volume of the fluid passage 11 can be reduced and the pressure-bearing capacity thereof can be increased, and the filling amount of the circulating working medium can be reduced, thereby reducing the risk of environmental pollution; on the other hand, the flow of the heat exchange medium into the flow equalizing cavity 21 can be accurately adjusted, so that the flow of the heat exchange medium in different heat exchange tubes remains consistent, thereby facilitating efficient heat exchange between the various heat exchange media inside and outside the tubes.

[0065] For the convenience of understanding, the differences between the micro-channel heat exchanger of the present application and the existing heat exchanger structure will be described in detail below.

[0066] In the related art, a heat exchanger disclosed in a Chinese patent application No. CN200910003071.6 has a structure and a processing technology that make the height of the distributor exceed the maximum width of the matched flat tube. However, the above heat exchanger structure has the following disadvantages: the excessive height of the distributor leads to an increase in the volume thereof, and also increases the filling amount of the circulating working medium, thereby increasing the risk of environmental pollution. In order to solve the above technical problem, the micro-channel heat exchanger of the present application divides the overall structure of the distributor into two independent components (i.e., the distributor tube part 1 and the flow equalizing plate part 2), wherein the distributor tube part 1 is specifically used to provide the fluid passage 11 for the flow of the heat exchange medium, and the flow equalizing plate part 2 is used to realize the insertion of the heat exchange tube and the uniform distribution of the heat exchange medium in the plurality of heat exchange tubes.

[0067] It should be noted that the structure of the heat exchanger in the related art has limitations in structure and processing (i.e., only the holes can be punched on the pipe of the distributor to realize the welding of the heat exchange tube), which leads to the fact that the hole diameter of the existing distributor must be designed to be relatively large, otherwise it cannot meet the requirements of punching and welding of the heat exchange tube. The heat exchanger structure of the present application divides the overall structure of the distributor into two independent components, i.e., the distributor tube part 1 and the flow equalizing plate part 2, and realizes the flow guidance of the heat exchange medium through the distributor tube part 1 and the installation of the heat exchange tube through the flow equalizing plate part 2, so that the distributor structure of the present application does not need to punch holes directly on the fluid passage 11, thereby the inner diameter of the fluid passage 11 can be designed to be relatively small, which reduces the volume, increases the pressure-bearing capacity, and reduces the filling amount of the circulating working medium, thereby reducing the risk of environmental pollution.

[0068] In addition, the related art's flow distribution structure also has the following defects: the existing heat exchanger's flow distribution structure cannot ensure that the heat exchange medium is accurately distributed to the connected flat tubes during the circulation medium distribution process, which may cause uneven heat exchange, and the flow distribution structure still needs to be improved. In view of this problem, the improved refrigerant flow distribution structure of the Chinese patent application No. CN201410410165.6 places a column containing a flow distribution cavity in the traditional flow distribution pipe, and controls the flow of the circulation medium into different cavities by adjusting the parameters such as the trajectory curvature, trajectory length, cross-sectional area and shape of the groove-shaped flow channel in the structure, so as to achieve the purpose of uniform heat distribution. However, the above structure still has some difficulties in popularization: (1) the structure is relatively complex in the design of the groove-shaped flow channel and the production of the column, and it is difficult to be integrally processed and formed, and the mass production difficulty is high; (2) the flow distribution cavity increases the stamping difficulty of the heat exchange pipe interface of the flow distribution pipe, and if the flow distribution cavity is installed first and then processed, it is not easy to punch the hole; if the hole is punched first and then processed, the problem of the reduced inner diameter of the flow distributor also increases the installation difficulty of the flow distribution cavity.

[0069] In order to solve the above technical problems, the micro-channel heat exchanger provided by the present application sets a plurality of flow uniformizing small holes 100 on the opening surface 10 of the flow distribution pipe part 1, so that the heat exchange medium in the fluid passage 11 can flow into the heat exchange pipe 4 in turn along the flow uniformizing small holes 100 and the flow uniformizing cavities 21 of the flow uniformizing plate part 2, wherein the shape, number and size of the flow uniformizing small holes 100 corresponding to a single flow uniformizing cavity 21 can be controlled to control the flow size of the heat exchange medium flowing into the heat exchange pipe 4, and the flow of the heat exchange medium into the flow uniformizing cavity 21 can be accurately adjusted, so that the flow of the heat exchange medium in different heat exchangers 4 remains consistent.

[0070] The present application also provides a processing method of a heat exchanger, which is used for batch production of the above heat exchanger, and comprises the following steps: step 1, using electric spark discharge punching or mechanical drilling process to punch flow uniformizing small holes 100 on the opening surface 10 of the flow distribution pipe part 1 produced by extrusion profile process; using stretching stamping process to complete the forming of the concave flow uniformizing cavity 21 and the heat exchange pipe insertion hole 210 on the plate material with a solder layer; step 2, inserting each heat exchange pipe (including the first heat exchange pipe 41 and the second heat exchange pipe 42) into the heat exchange pipe insertion hole 210; step 3, bonding the opening surface 10 of the flow distribution pipe part 1 with the brazing surface 20 of the flow uniformizing plate part 2 to complete the assembly of the heat exchanger; and step 4, placing the assembled heat exchanger into a brazing furnace to complete brazing sealing.

[0071] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A micro-channel heat exchanger comprising a manifold and heat exchange tubes, characterized by: The diversity flow collector is a combined structure composed of a diversity tube part (1) and a flow uniformization plate part (2), the diversity tube part (1) is provided with an open surface (10) and a fluid passage (11), the open surface (10) is provided with a plurality of flow uniformization small holes (100) communicated with the fluid passage (11), the flow uniformization plate part (2) has a brazing surface (20) provided with a solder layer, the brazing surface (20) is provided with a plurality of concave flow uniformization cavities (21), the bottom of each flow uniformization cavity (21) is provided with a heat exchange tube insertion hole (210), a heat exchange tube is inserted into the heat exchange tube insertion hole (210) to communicate the flow uniformization cavity (21), the open surface (10) is combined and brazed with the brazing surface (20), the flow uniformization cavities (21) are communicated with the fluid passage (11) through the plurality of flow uniformization small holes (100).

2. The micro-channel heat exchanger of claim 1, wherein: The brazing surface (20) is further provided with a plurality of baffle grooves (23) communicated with two adjacent flow uniformization cavities (21); two or more adjacent heat exchange tubes are connected in series through the flow uniformization cavities (21) and the baffle grooves (23) to form a multi-flow heat exchange structure.

3. The micro-channel heat exchanger of claim 2, wherein: The flow channel diameter of a group of heat exchange tubes forming the multi-flow heat exchange structure increases in turn along the medium flow direction.

4. The micro-channel heat exchanger of claim 1, wherein: The diversity tube part (1) further comprises a first diversity interface (31) and a second diversity interface (32), the fluid passage (11) is a porous tube structure and comprises at least two porous tubes, namely a first porous tube (111) and a second porous tube (112), wherein the first porous tube (111) is communicated with the first diversity interface (31), and the second porous tube (112) is communicated with the second diversity interface (32).

5. The micro-channel heat exchanger of claim 4, wherein: Further comprising fins (5) brazed on the heat exchange surfaces of the heat exchange tubes, the heat exchange tubes comprise first heat exchange tubes (41) and second heat exchange tubes (42), the first heat exchange tubes (41), the fins (5) and the second heat exchange tubes (42) are alternately arranged and fixed by brazing, the first heat exchange tubes (41) and the second heat exchange tubes (42) are adapted to exchange heat through the fins (5); the first heat exchange tubes (41) flow through the flow uniformization cavities (21) and the flow uniformization small holes (100) and are communicated with the first porous tube (111), and the second heat exchange tubes (42) flow through the flow uniformization cavities (21) and the flow uniformization small holes (100) and are communicated with the second porous tube (112), to form a three-medium heat exchanger structure.

6. The microchannel heat exchanger according to any of claims 1 to 5, characterized in that: The diversity tube part (1) has two positioning side plates (12), the two positioning side plates (12) are respectively located on the two sides of the open surface (10), and the flow uniformization plate part (2) is clamped between the two positioning side plates (12).

7. The micro-channel heat exchanger of claim 6, wherein: The flow uniformization plate part (2) has two brazing folded edges, the two brazing folded edges are respectively located on the two sides of the brazing surface (20), and the brazing folded edges are covered by the positioning side plates (12).

8. The micro-channel heat exchanger of claim 6, wherein: The positioning side plates (12) are further provided with grooves (120), and the edge portions on the two sides of the flow uniformization plate part (2) are adapted to be inserted into the grooves (120) to realize the positioning and fixing of the flow uniformization plate part (2).

9. The microchannel heat exchanger according to any of claims 1 to 5, characterized in that: The flow-equalizing plate part (2) further has two brazing flanges on both sides of the brazing surface (20), and the header part (1) is clamped between the two brazing flanges.

10. A method for processing a heat exchanger, for mass production of the heat exchanger according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: Step 1, the flow-equalizing small holes (100) are punched on the open surface (10) of the header part (1) produced in an extrusion profile process by using an electric spark discharge punching process or a mechanical drilling process; the concave flow-equalizing cavity (21) and the heat exchange tube insertion hole (210) are formed on a plate with a solder layer by using a drawing stamping process; Step 2, each heat exchange tube is respectively inserted into one heat exchange tube insertion hole (210); Step 3, the open surface (10) of the header part (1) is attached to the brazing surface (20) of the flow-equalizing plate part (2) to complete the assembly of the heat exchanger; and Step 4, the assembled heat exchanger is placed into a brazing furnace to complete the brazing sealing.

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