WO2015027783A1

WO2015027783A1 - Micro-channel heat exchanger and method for manufacturing same

Info

Publication number: WO2015027783A1
Application number: PCT/CN2014/083129
Authority: WO
Inventors: 崔凯
Original assignee: 杭州三花研究院有限公司
Priority date: 2013-08-30
Filing date: 2014-07-28
Publication date: 2015-03-05
Also published as: DE112014003913T5

Abstract

A micro-channel heat exchanger (100) and a method for manufacturing same. The heat exchanger (100) comprises a first header pipe (1) provided with a partition component (16) comprising a main partition (162) and an assistant partition (163). The main partition (162) divides the pipe body of the header pipe (1) into a first chamber (111) and a second chamber (112). The assistant partition (163) divides the second chamber (112) into at least two flow chambers (112a) which are relatively independent and extend longitudinally. The first chamber (111) communicates with at least one flow chamber (112a) by arranging a split hole (161) in the main partition (162). The heat exchanger can make the distribution of the refrigerant in the header pipe (1) more uniform and improve the heat exchange efficiency.

Description

Microchannel heat exchanger and manufacturing method thereof The present application claims to be Chinese patent filed on August 30, 2013, the application number is 201310391034.3, and the invention name is "microchannel heat exchanger and microchannel heat exchanger manufacturing method" The application, and the priority of the Chinese Patent Application No. 201310389323.1, entitled "Microchannel Heat Exchanger", filed on August 30, 2013, the entire contents of which is incorporated herein by reference. Technical field

The present invention relates to a heat exchange device, and more particularly to a microchannel heat exchanger, and to a method of manufacturing a microchannel heat exchanger. Background technique

The microchannel heat exchanger comprises a header at both ends, a flat tube connecting the headers, and fins disposed between the adjacent flat tubes, the flat tubes being provided with microchannels through which the refrigerant passes. The working principle is: the refrigerant enters the corresponding collecting pipe through the inlet end of the collecting pipe, and then enters into the flat pipe through the collecting pipe, and exchanges heat with the external medium in the process of flowing in the flat pipe, thereby realizing Cooling or heating. Ideally, the refrigerant should be evenly distributed into the microchannels of each flat tube to ensure optimum heat transfer efficiency of the heat exchanger. The inventor believes that the collector of the heat exchanger is generally elongated, and the refrigerant is affected by the resistance in the header, so that the flow rate of the refrigerant at the inlet end and the distal end of the header is relatively large, the refrigerant Uneven flow in the header will increase the uneven distribution of the refrigerant in the flat tube, which in turn affects the heat transfer efficiency of the microchannel heat exchanger. Summary of the invention

The invention provides a microchannel heat exchanger, which has a single structure, and the refrigerant can be more evenly distributed in the longitudinal direction of the collecting pipe, so that the refrigerant distribution in the flat pipe is more uniform to improve the heat exchange efficiency. The present invention uses the following technical solution: a microchannel heat exchanger comprising a first header, a second header, a flat tube connecting the first header and the second header, and a fin between adjacent flat tubes; the first header includes a header tube body, a flow hole for allowing refrigerant to enter and exit the first header tube, and the header tube body is provided with a plurality of a flat tube hole, the first header is provided with a partition member extending longitudinally along the tube body, the partition member includes a main partition and a sub-separator, and the main partition will collect the current The tube body is divided into a first cavity and a second cavity, and the main partition is provided with at least one component flow hole; the first cavity is disposed near a side of the flat tube, and the flat tube is An end of one end projects into the first cavity; the secondary partition divides the second cavity into at least two relatively independent flow chambers extending longitudinally along the header body, The first cavity communicates with the at least one of the flow passages through the flow dividing holes provided on the main partition. The invention also discloses a method for manufacturing a microchannel heat exchanger, the microchannel heat exchanger comprising a first header and a second header, connecting the first header and the second set a flat tube of the flow tube, and a fin between the adjacent flat tubes; the first header tube includes a header tube body, a flow hole for the refrigerant to enter and exit the header tube body, the first a partition member extending longitudinally of the manifold body, the partition member including a main partition and a sub-separator, wherein the main partition is provided with a diversion hole; the collector tube body In combination, the header body includes a first tube body and a second tube body, the first tube body is provided with a flat tube hole, and the first tube body and the second tube body pass through the crucible The phase separation member is fixedly disposed with the second tube body and forms at least two flow passages; the processing of the microchannel heat exchanger comprises the following steps:

51, parts processing: processing various parts of the microchannel heat exchanger, and then assembling to form a heat exchanger assembly;

52, the heat exchanger assembly is integrally welded by welding in a furnace, the heat exchanger assembly includes at least a first pipe body, a partition member, a second pipe body, a flat pipe, a fin, and a second header; The SI step includes the following sub-steps:

511, the first pipe body forming: the blanking of the sheet material is completed at the same time to form a flat tube hole; or the first tube body is formed at the same time to complete the punching to form a flat tube hole; or the profile processing is performed, and the length is processed and processed according to the length The two ends and the flat tube hole form a flat tube hole or the material is cut at the same time;

512, the second pipe body forming: the material is cut and processed; or the profile is processed, and the two ends are formed according to the length and processed;

513, processing of partition parts: 釆 processing of profiles, including cutting and processing the two ends according to the length and processing the split holes; or completing the split hole processing while cutting;

S14, assembling the fixed first pipe body, the second pipe body, and the partition member. In the microchannel heat exchanger of the present invention, by providing a partition member in the first header, refrigerant entering from the flow hole into the header body is distributed to a plurality of relatively independent flow chambers, each The refrigerant in the circulation chamber is relatively independently circulated, and the refrigerant is supplied in sections along the length of the header, which can reduce the influence of the internal resistance of the first header on the flow of the refrigerant in the first header, so that the refrigeration The agent is more evenly distributed in the longitudinal direction of the first collecting pipe, which can improve the efficiency of the microchannel heat exchanger; at the same time, the shunt tube is omitted, and the shunt is directly realized through the partition plate, thereby avoiding the complicated processing technology of the shunt tube, and the structure is relatively The order can reduce the manufacturing cost. DRAWINGS

1 is a schematic structural view of a microchannel heat exchanger of the present invention;

2 is a schematic structural view of a first header of the present invention;

3 is a schematic exploded view showing the structure of the first header in the first embodiment of the present invention;

Figure 4 is a transverse cross-sectional view of the first header in the first embodiment of the present invention;

Figure 5 is a schematic exploded view showing the structure of the first header in the second embodiment of the present invention; Figure 6 is a transverse cross-sectional view of the first header in the second embodiment of the present invention;

Figure 7 is a schematic exploded view of the first header in the third embodiment of the present invention; Figure 8 is a transverse cross-sectional view of the first header in the third embodiment of the present invention;

9 is a schematic exploded view of the first header in the fourth embodiment of the present invention; FIG. 10 is a transverse cross-sectional view of the first header in the fourth embodiment of the present invention;

Figure 11 is a schematic view showing the structure of the flow guiding member 10 shown in Figures 9 and 10;

Figure 12 is a transverse cross-sectional view of the first header in the fifth embodiment of the present invention;

Figure 13 is a cross-sectional view showing the first header A-A of Figure 2 in the first to fifth embodiments of the present invention;

Figure 14 is a schematic exploded perspective view of a first header according to a sixth embodiment of the present invention; and Figure 15 is a cross-sectional view along line A-A of the first header shown in Figure 2 in the sixth embodiment of the present invention. detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

As shown in FIG. 1 , the present invention discloses a channel heat exchanger 100 including a first header 1 , a second header 2 disposed parallel to the first header 1 and spaced apart by a predetermined distance, and disposed at the first A manifold 1 and a second header 2 are connected between the plurality of flat tubes 3 of the first header 2 and the second header 2, and are disposed between the adjacent flat tubes 3 to be exchanged. Thermally efficient fins 4.

The two ends of the flat tube 3 are respectively inserted into the first header tube 1 and the second header tube 2, and the flat tube tube 3 is provided with a plurality of microchannels (not shown) through which the microchannels of the flat tube 3 are connected. A header 1 and a second header 2; the header 3 and the first header 1 and the second header 2 are fixed and sealed by welding.

As shown in FIG. 2 to FIG. 14, the first header 1 includes a header tube body 11 and a first end cap 12 and a second end cap 13 at both ends of the manifold tube body 11, and the first end The cover 12, the second end cover 13 or the flow tube body 11 fixedly connected to the flow tube 15, the header body 11 and the The one end cover 12 and the second end cover 13 are sealingly disposed.

A plurality of flat tube holes 14 are formed in the tube wall of the collecting tube body 11, and the flat tube holes 14 are arranged corresponding to the flat tubes 3 in the longitudinal direction of the collecting tube body 11 (left-right direction as shown in FIG. 2). The tube hole 14 has a size and shape to cooperate with the flat tube 3 to facilitate insertion and fixing of the flat tube 3 and welding sealing; the collecting tube body 11 is internally provided with a partition member 16 extending longitudinally along the header tube body 11, and the partition member 16 The first main partition 162 and the first sub-separator 163 extending longitudinally along the header body 11 are included. The first main partition plate 162 is provided with a plurality of flow dividing holes 161 therethrough, and the flow dividing holes 161 may be divided into a plurality of groups. In the solution of the present invention, each of the flow holes 161 is arranged in an array at equal intervals along the longitudinal direction of the header pipe body 11, and the arrangement direction of the component flow holes 161 is parallel to each other. For example, in the embodiment shown in Figs. 3, 5, 7, and 9, the flow dividing holes 161 are all divided into three groups, and each of the flow holes 161 are arranged at equal intervals along the longitudinal direction of the header pipe body 11. One column, and the arrangement direction of the three-component orifices 161 are respectively on three parallel lines of equal spacing. In the embodiment shown in Fig. 14, the flow dividing holes 161 are divided into two groups, and each of the flow holes 161 is arranged in an array at equal intervals in the longitudinal direction of the header pipe body 11. The arrangement direction of the two component orifices 161 is parallel. The first main partition 162 divides the header body into a first cavity 111 that communicates with the flat pipe in a direction close to the flat pipe, and a split hole that is not directly connected to the flat pipe but passes through the first main partition 162. 161 or a second cavity 112 partially communicating with the first cavity through the distribution chamber, the second cavity 112 is separated by the first sub-spacer 163 into at least two flow chambers 112a that are relatively independent, and each flow chamber 112a is A group of flow holes 161 are in communication and communicate with the first cavity 111 through a flow dividing hole 161 communicating therewith. Here, the number of the first sub-separators 163, the number of the flow-through chambers 112a, and the number of groupings of the diverting holes 161 can be adjusted as needed. If the length of the headers is relatively long, the number of the first sub-separators 163 can be increased. Thus, the number of the flow-through chambers 112a and the number of groupings of the split-holes 161 can be correspondingly increased; so that a part of the first main partitions corresponding to each of the flow-through chambers 112a are respectively provided with a set for communicating with the first chamber. The split hole 161. In addition, the first header 1 may further include a second partition 17 along which the partition mounting hole 171 for providing the second partition is further disposed. The partition mounting hole 171 is for mounting the second partition plate 17 and limiting the second partition plate 17, and the second partition plate 17 is inserted into the mounting position through the partition mounting hole 171 and fixed to the partition member 16, thereby A cavity is divided into a plurality of relatively independent distribution chambers 111a. Each of the distribution chambers 111a corresponds to a component flow hole 161 and a flow passage 112a, respectively, and communicates with the corresponding flow passage 112a through the corresponding split flow hole 161.

Thus, the refrigerant entering the header pipe body 11 from the flow pipe 15 is appropriately distributed before reaching the second cavity by the partition member 16 provided in the first header 1, and the corresponding refrigeration is distributed. The agent is given to a plurality of relatively independent flow chambers; or at least a portion of the refrigerant is first distributed to the plurality of relatively independent flow chambers, and then the refrigerant of each of the flow chambers is led to the passage through the split holes provided in the first main partition The first cavity 111 corresponding to the portion is then distributed to the flat tube 3 that cooperates with the portion of the first cavity 111, so that the refrigerant flows independently in each of the circulation chambers, so that the first header 1 can be along The refrigerant is supplied in sections in the longitudinal direction, and the influence of the resistance of the collector on the flow of the refrigerant in the first header 1 can be reduced, and even the other end farthest from the inlet of the flow tube 15 can be circulated. The cavity is distributed to the corresponding required refrigerant, so that the refrigerant is more evenly distributed in the longitudinal direction of the first header 1, and the efficiency of the microchannel heat exchanger is improved; at the same time, the present invention eliminates the distribution pipe and directly passes Partition member 16 to achieve diversion and distribution, simple structure, the manufacturing cost can be reduced.

In addition, in order to make the distribution of the refrigerant more uniform, a second partition 17 may be disposed in the first cavity 111, and the second partition 17 partitions the first cavity 111 into at least two relatively independent ones in the longitudinal direction. The distribution chamber 111a is thus divided into at least two groups by the arrangement of the second partition plate 17, each of the distribution chambers 111a corresponding to a plurality of flat tubes, and the second partition plate 17 is in contact with the partition member 16 to seal or pass The second partition plate 17 further refines the first cavity 111 of the header pipe body 11 and is further disposed as a plurality of refrigerant circulation distribution regions, thereby further increasing the length of the refrigerant along the length of the collector pipe body. Uniformity increases the heat transfer efficiency of the microchannel heat exchanger.

Corresponding to the second partition plate 17, corresponding partition mounting holes are provided on the header body 11 171, the partition mounting hole 171 is an elongated hole penetrating through the side of the collector tube body 11. The size of the hole is matched with the second partition plate 17, and the length thereof may be slightly larger than the length of the second partition plate 17, ensuring the first The second partition plate 17 can be inserted into the header pipe body 11 from the outside of the header pipe body 11 through the partition plate mounting hole 171.

The first end cover 12 or the second end cover 13 is provided with a flow hole (not shown) through which the refrigerant enters and exits; the first header 1 may be provided with a flow tube 15 corresponding to the flow hole, and the flow tube 15 is The longitudinal extension direction of the one end cover 12 or the second end cover 13 is opposite to the longitudinal extension direction of the header tube body 11 from the first end cover 12 or the second end cover 13; the refrigerant flows into and out of the first current collecting pipe 15 Tube 1. In the present invention, the first header 1 is an inflow header, the flow hole is an inflow hole, and the flow tube 15 is an inflow tube; of course, the flow hole may also be disposed on the manifold tube 11, such that the flow tube 15 is also disposed on the header body 11, so that the position of the flow hole can be selected according to the matching structure.

In the first embodiment of the present invention, as shown in FIG. 3 and FIG. 4, the microchannel heat exchanger 100 includes a first header 1, and the first header includes a header body 11 and a first end cap. 12. The second end cap 13 and the flow tube 15.

As shown in FIG. 13, the header pipe body 11 is of a combined type, including a first pipe body 191 and a second pipe body 192, and the first pipe body 191 and the second pipe body 192 are laterally oriented (front and rear direction as shown in FIG. 2). The cross section has a substantially arc shape, and the first tube body 191 and the second tube body 192 are combined by splicing to form the header tube body 11; when the splicing combination, the first tube body 191 wraps the second tube body 192 or The second pipe body 192 wraps the first pipe body 191, and the wrap structure can increase the sealing property and the compressive strength of the header pipe. In order to limit the assembly position of the first tube body 191 and the second tube body 192, it is necessary to cover the outer surface of the wrapped tube body such as the second tube body 192 or the inner surface of the wrapped tube body such as the first tube body 191. The step is set, the structure is relatively simple, easy to process, and at the same time, it can play a good limit function, and the first header has high pressure resistance. Of course, the transverse shape of the first tube body 191 and the second tube body 192 may be other shapes, such as a rectangular shape, as long as the circulation and sealing of the refrigerant can be completed after the splicing. Combined manifold The body can separately assemble the collector tube body to improve the assembly efficiency; of course, the collector tube body 11 can also be a unitary type, and the cross-sectional shape thereof can be circular, rectangular or elliptical.

The first pipe body 191 is provided with a flat pipe hole 14, and the flat pipe hole 14 is arranged longitudinally along the first pipe body 191. The second pipe body 192 is provided with a partition member 16 extending longitudinally along the second pipe body 192. A space between the first main partition 162 of the partition member 16 and the first tubular body 191 forms a first cavity 111, and a space between the second tubular body 192 and the first main partition 162 of the partition member 16 forms a second space. The cavity 112, the second cavity 112 is further divided by the sub-separator 163 of the partition member 16 into at least two flow passages 112a that are relatively independent.

The second pipe body 192 and the partition member 16 may be integrally extruded or stretch-formed, and the partition member 16 includes two portions disposed substantially vertically: a main partition plate and a sub-separator, and the main partition plate is provided with a split hole, and the sub-separator The plate partitions and seals the second cavity 112 to form three independent flow chambers 112a, wherein the main partition is disposed substantially in a horizontal direction, and the sub-separators are disposed substantially vertically, wherein the horizontal direction is substantially the same as the flat tube hole arrangement direction. In the parallel direction, the vertical direction refers to a direction perpendicular to the horizontal direction; generally, the connection portions of the microchannel heat exchanger components are all completed by welding, but the welding is prone to flaws, and the sealing property is poor, resulting in low product qualification rate; Therefore, in the embodiment, the second pipe body 192 and the partition member 16 are integrally extruded or stretched, so that the process is simple, the sealing property is ensured, and the product qualification rate can be improved.

The branching holes 161 in the partitioning member 16 are divided into a plurality of groups corresponding to the flow-through chamber 112a in the longitudinal direction of the header pipe body 11, and a component flow hole 161 is provided in the main partition plate 162 of the partition member 16 which is away from the one end of the flow-through hole. .

The first end cover 12 and the second end cover 13 are disposed at two ends of the collecting tube body 11. The first end cover 12 is provided with a circulation hole, and the circulation hole is for the refrigerant to enter and exit the collecting tube body 11, the first end cover 12 and the shape of the second end cover 13 is matched or partially matched with the shape of the inner surface of the header body 11, and is sealed by welding after assembly, and the partition member 16 is close to the side of the flow hole with respect to the manifold body. 11 is retracted by a certain distance, so that after the first end cover 12 is assembled, the inner surface of the first end cover is spaced from the partition member to form a distribution chamber 113, so that the collector tube is entered. The refrigerant of the tubular body enters the distribution chamber 113 and then enters the flow chamber 112a of the first chamber 111 and the second chamber 112.

In the second embodiment of the present invention, as shown in FIGS. 5 and 6, the main difference from the first embodiment is that the partition member completely separates the first cavity from the second cavity, specifically, The first cavity is separated from the second cavity by the main partition such that the flow hole communicates with the first cavity 111 through the second cavity 112 and the split hole 161 on the main partition 162 of the partition member 16.

The two ends of the main partition of the partitioning member 16 abut against the first end cover, the second end cover or substantially abut against the first end cover and the second end cover, and the abutting means contacting and forming a sealing portion, basically The abutment is contact but not completely sealed; the length of the sub-separator 163 is smaller than the length of the main partition 162; the space between the partition member 16, the header body 11 and the first end cover 12 forms a distribution chamber 113; After entering the header tube 11 through the flow tube 15, first entering the distribution chamber 113, the refrigerant in the distribution chamber 113 enters the relatively independent flow chamber 112a, and enters through the one-component flow hole 161 corresponding to each flow chamber 112a. a cavity 111, the distribution hole 161 is arranged longitudinally along the collector tube body, and then distributed from the first cavity to the corresponding flat tube 3; using such a structure that the refrigerant first passes through the second cavity The distribution is relatively evenly distributed to each of the circulations 112a, and then the corresponding distribution holes are arranged in sections corresponding to the length direction of the header body, and even the end farthest from the flow holes can be distributed to the corresponding refrigerant, so that the refrigeration In the agent A longitudinal direction of the dispensing chamber more uniform, thereby enabling more uniform refrigerant distribution in the longitudinal direction of the flow of the first header.

In a third embodiment of the present invention, as shown in FIGS. 7 and 8, compared with the first embodiment: two second partitions 17 are provided in the first cavity 111, and the second partition 17 will The first cavity 111 is divided into three relatively independent distribution chambers 111a; the second partition 17 divides the flat tubes communicating with the first chamber into three groups, and each of the distribution chambers 111a corresponds to a set of flat tubes; The partition plate 17 is a combination of a circular arc and a linear line, the linear portion of which cooperates with the partition member 16, and the arc portion thereof cooperates with the outer surface of the header tube to seal the adjacent distribution chamber 111a to form at least The two refrigerant passages; that is, the refrigerant flowing from the flow pipe 15 first reaches the distribution chamber 113, and then partially distributed to the distribution chamber 111a communicating with the distribution chamber 113, and the remaining portion passes through the partition member 16 and the second tube body 192. The plurality of flow passages 112a formed are circulated, and flow to the distribution chamber 111a through the branch holes 161 provided in the main partition 162 of the partition member 16, and then distributed to the corresponding flat tubes through the distribution chamber 111a; The distribution of the agent is pre-distributed near the inlet, and the refrigerant entering the circulation chamber 112a flows through the distribution hole 161 to the corresponding distribution chamber 111a, so that even a portion of the flat tube farthest from the inlet of the flow tube 15 can Assign to the required refrigerant. By adopting such a structure, the first cavity 111 inside the header pipe body 11 is further divided by the second partition plate 17, which contributes to more uniform distribution of the gas-liquid two-phase refrigerant in the header pipe body 11, thereby ensuring The uniformity of the gas-liquid two-phase refrigerant when reaching the flat tube hole 14 improves the heat exchange efficiency of the microchannel heat exchanger; the structure can especially make the gas-liquid two-phase refrigerant in the vertically disposed first header 1 more uniform The distribution ensures that the refrigerant entering the flat tube hole 14 is more evenly distributed, and the heat exchange efficiency of the microchannel heat exchanger is improved.

Specifically, the first pipe body is provided with a partition mounting hole 171, and the partition mounting hole 171 is located between the adjacent flat pipe holes 14; the partition mounting hole 171 is an elongated hole penetrating the first pipe body 191, and the length thereof Slightly larger than the length of the second partition, it is ensured that the second partition 17 can be inserted into the header tube 11 from the outside of the header body through the partition mounting hole 171.

In addition, in order to further ensure the uniform distribution of the fluid, the cross-sectional area of the flow guiding channel can be matched correspondingly, for example, the flow cross-sectional area of each flow-through chamber becomes longer as the distance through which the refrigerant flows through the flow-through chamber becomes longer. Further, the diversion holes which flow between the circulation chamber and the first chamber are enlarged as the distance through which the refrigerant flows through the circulation chamber becomes longer, which promotes more uniform distribution of the refrigerant. In addition, in the above embodiment, the flow chambers shown in the figures are three, and the actual flow can be increased or decreased as needed, that is, the length of the header can be adjusted.

In the fourth embodiment of the present invention, as shown in FIG. 9 to FIG. 11, the main difference from the third embodiment is that: the first header is further provided with a flow guiding element 10, and the flow guiding element 10 is nested in the set. In the flow tube body 11, the flow guiding element 10 abuts against one end of the partition member 16 close to the flow hole Or close by and seal by welding.

As shown in FIG. 11, the flow guiding element 10 includes a bottom plate 101 and a frame body 102; the outer surface of the frame body 102 abuts against the inner surface of the header pipe body 11, and the bottom plate 101 includes a flow guiding area and a circulation area, and the flow guiding The bottom surface of the area abuts against the end of the partition member 16 close to the flow hole, and prevents the refrigerant from directly entering the first cavity 111 through the flow hole; the flow area is specifically a passage provided on the bottom plate 101 corresponding to the flow chamber 112 in the embodiment. Hole 103.

The flow guiding region is provided with a strip-shaped convex block 104. The convex direction of the strip-shaped convex block 104 is from the bottom plate 101 of the flow guiding element 10 toward the flow hole, and the strip-shaped convex block 104 divides the flow guiding of the bottom plate 101 into The fluid passage corresponding to the number of the flow passages 112 introduces the refrigerant into each of the flow passages 112a; 釆 With this structure, the uniform distribution of the refrigerant can be further ensured, and the distribution uniformity of the refrigerant in the headers can be improved. Improve the heat exchange efficiency of the microchannel heat exchanger. In addition, the flow guiding element may also have a shape corresponding to the cross section of the first cavity, so that after entering the collecting pipe, the refrigerant does not directly enter the first cavity, but first reaches the distribution cavity 113, in the distribution cavity. The pre-distribution is carried out, and then enters the corresponding circulation chamber, and enters the corresponding position of the first cavity through the diversion holes provided in the respective circulation chambers, and then is distributed into the flat tube.

The first end cover 12 is nested in the frame body 101 of the flow guiding element 10, and the outer surface of the first end cover 12 abuts against the inner surface of the frame body 101 of the flow guiding element 10 to prevent refrigerant from flowing from the collecting tube body. Leakage outward; the area enclosed by the first end cap 12 and the flow guiding element 10 is generally trapezoidal such that the shunting zone is closer to the flow aperture.

The convex blocks of the flow guiding area may also have other shapes, such as circular or elliptical protrusions distributed according to a certain regularity.

In the fifth embodiment of the present invention, as shown in FIG. 12, the difference from the third embodiment is that: at both ends of the partition member 16, a second partition plate 17, a second partition plate 17 and a partition member 16 and a set are provided. The flow tube body 11 abuts to prevent the refrigerant from directly entering the first cavity 111 after entering the flow hole, and the refrigerant is distributed to the relatively independent plurality of flow passages 112a, and then respectively passed through the multi-component flow holes distributed in the longitudinal direction. Entering each of the distribution chambers 111a of the first cavity, and then It is distributed to the flat tubes that communicate with the respective distribution chambers 111a. In the present embodiment, the distribution chamber 113 is also constructed using the second separator 17 as a spacer member. Specifically, a second spacer 17 disposed in the second spacer 17 near the end of the flow aperture is used as the spacer member, and the second spacer 17 as the spacer member is adjacent to the adjacent header tube and the partition member. The partition plate is abutted, and the welded seal is assembled, so that the header tube body, the second partition plate 17, and the first end cover enclose the distribution chamber 113.

In the above embodiment, the partition member 16 and the second tube body 192 of the header are integrally formed, and specifically may be a profile formed by stretching or extrusion, and the profile directly includes a circulation chamber and a main partition and a sub-separator, which can reduce Finally, the welding points during welding are assembled, and the processing and assembly are relatively simple. In addition, in the embodiment described above, there is a distribution chamber communication between the circulation chamber and the flow hole. However, the present invention is not limited thereto, and the flow tube may be directly connected to several communication nozzles and directly connected to the circulation. The cavity, such as the outlet of the communication pipe leading to the first header, is divided into three interfaces, and the three interfaces are respectively connected to the three flow chambers, so that the object of the invention can also be achieved, so that the distribution is more uniform, only manufacturing Relatively complicated.

The invention also discloses a manufacturing method of a microchannel heat exchanger, wherein the microchannel heat exchanger comprises a first collecting pipe, a second collecting pipe, and a flat pipe connecting the first collecting pipe and the second collecting pipe, And a fin between the adjacent flat tubes; the first collecting tube comprises a collecting tube body, a circulation hole for the refrigerant to enter and exit the collecting tube body, and the first collecting tube is provided with a longitudinal direction along the collecting tube body The extending partition member, the collecting tube body is a combined type, the collecting tube body comprises a first tube body and a second tube body, the first tube body is provided with a flat tube hole, the first tube body and the second tube body The welding component is fixed by the welding phase; the partitioning member is fixedly disposed with the second pipe body and forms at least two flow passages; the processing process comprises the following steps: si, component processing: processing various parts of the microchannel heat exchanger, Then assembling to form a heat exchanger assembly, wherein the partition member is processed by a profile; S2, the heat exchanger assembly is integrally welded by welding in a furnace, and the heat exchanger assembly is Less includes the first pipe body, the partition member, the second pipe body, the flat pipe, the fins, and the second header. Among them, S1 parts processing includes the following sub-steps:

511. Forming the first pipe body: the blanking of the plate is completed at the same time, forming a flat pipe hole, and if there is a partition mounting hole, the partition mounting hole is formed at the same time; or the profile is used, the length is cut and the two ends are processed according to the length And flat tube holes, forming flat tube holes or cutting materials while completing flat tube hole processing;

512, the second pipe body molding: sheet or profile cutting and processing;

513. The partitioning parts are cut, the profile processing is specifically performed, the two ends are processed according to the length, and the split holes are processed; or the split hole processing is completed at the same time of cutting;

514. Fix and fix other components such as the formed first pipe body, the second pipe body, and the partition member.

In the above-mentioned S14 sub-step, that is, the first pipe body, the second pipe body, and the partition member assembly program, if the heat exchanger further includes a second partition plate, or at the same time or later, the second partition plate is inserted into the first pipe body. The upper partition mounting hole; if the heat exchanger further includes a flow guiding element, the flow guiding element is assembled with the collecting tube, and the bottom plate of the guiding element is closely attached to the partitioning member; then the first end cover or the first end is installed Two end caps. Thus, by combining the first pipe body and the second pipe body to form the header pipe body, the partitioning member in the manifold pipe body can be assembled relatively simply, and the first header pipe is assembled and the microchannel heat exchanger In-furnace welding together, the final assembly of the heat exchanger can be completed by only one welding, and the process is relatively small.

Further, the second pipe body may be integrally formed with the partition member, that is, the second pipe body and the partition member are integrally formed. S11 parts processing includes the following sub-steps:

S11, the first pipe body forming: the blanking of the sheet material is completed at the same time, forming a flat pipe hole, and if there is a partition mounting hole, the partition mounting hole is formed at the same time; or the profile is used, the length is cut and the two ends are processed according to the length And flat tube 孑L; 512. Processing of the second pipe body and the partition member: the material is cut, the two ends are processed and the split hole is processed; or the split hole is processed at the same time;

513. Fix and fix the processed second pipe body and the partition member assembly with other components such as the first pipe body.

The microchannel heat exchanger formed by the above manufacturing method uses the integrally formed partition member and the second pipe body to reduce the welding point, and the joint member of the partition member and the second pipe body can be effectively insulated, thereby ensuring the refrigerant. The distribution effect is achieved, and after the profile is used, the consistency is also improved, thereby ensuring the yield of the finished product.

Of course, the second header may be the same as or different from the first header.

In the sixth embodiment of the present invention, as shown in FIGS. 14 to 15, the partition member 16 is arranged in a Y shape, that is, the partition member 16 includes two main partitions 164 and a sub-separator 165, and two main partitions 164. The sub-separator 165 has an edge that is common to all three, thereby forming a Y-shaped arrangement. The partitioning member 16 divides the header body 11 into a first cavity 111 and a second cavity 112, wherein each of the two main partitions 164 has an edge abutting against the inner wall of the header body 11, thereby collecting the current The tube body 11 is partitioned into a first cavity 111 and a second cavity 112. The first cavity 111 is in direct communication with the flat tube hole 14. The first cavity 111 and the second cavity 112 are disposed through the partition member 16. The multi-component flow holes 161 are connected, and the sub-separator 165 is disposed in the second cavity 112, and one edge thereof abuts against the inner wall of the second cavity 112, so that the second cavity 112 is further separated by the sub-separator 165 into relatively independent ones. Two flow passages 112a, wherein a group of flow holes 161 corresponding to one of the flow passages 112a are located on the partition member 16 away from one end of the flow hole. In the present embodiment, the first cavity 111 and the second cavity 112 communicate with the flow holes of the first end cap 12. Of course, the circulation chamber is not limited to two, and may be three or more.

In the present embodiment, the partition member 16 and the header pipe body 11 are combined, and the partition member 16 is an integrally formed piece processed from a profile, and the split hole is processed after the blanking, and then the partition member is assembled to the header pipe body. In the 11th, the collecting pipe, the flat pipe, the fin, and the like are assembled and fixed into a heat exchanger, and then formed by welding in the furnace. In the present embodiment, the partition member 16 and the second partition The plate 17 may be a flat plate combination or a corrugated plate, and may be selected as needed. The principle of refrigerant distribution in the sixth embodiment of the present invention is: the refrigerant enters the header pipe body 11 through the flow hole of the first end cover 12, and the refrigerant is divided into three parts by the partition member 16, and one portion enters the first chamber. The body 111 enters the two flow chambers 112a, and the refrigerant entering the flow chamber 112a enters the first chamber 111 through the corresponding one-component orifice 161, and then flows out through the flat tube 3 communicating with the first chamber 111. First header 1.

Of course, in the present embodiment, a second separator may be provided, and the refrigerant in the header can be further uniformly distributed to uniformly distribute the refrigerant in the flat tube. Alternatively, a second partition or flow guiding member may be provided at the end of the flow hole to make the distribution of the refrigerant more uniform. In addition, the first end cap and the flow tube of the above various embodiments may also be an integrally formed stamping member, which can reduce the solder joint.

The microchannel heat exchanger 100 disclosed by the present invention comprises a first header 1, a second header 2, a flat tube 3 and a fin 4, and the first header 1 is an inflow header, wherein the first The structure of the header 1 can be referred to as described above. With the first header of the present invention, the refrigerant entering the header body is segmented in the longitudinal direction of the header, so that the refrigerant enters the flat tube. The distribution is more uniform, so that the heat exchange efficiency of the microchannel heat exchanger 100 can be improved.

One end of the flat tube 3 is inserted into the first header 1 through a flat tube hole 14 disposed in the first header 1. The end of one end of the flat tube 3 is located in the first chamber of the first header 1 and The partition member 16 retains a certain gap; ensures that the refrigerant can smoothly flow into the flat tube 3, further ensures the uniformity of the refrigerant in the flat tube 3, and improves the heat exchange efficiency of the channel heat exchanger. The present invention has been described in detail with reference to the embodiments described above, but those skilled in the art will understand that the invention can be modified or substituted. All the technical solutions and improvements thereof without departing from the spirit and scope of the invention are intended to be included within the scope of the appended claims.

Claims

Rights request

1. A microchannel heat exchanger, including a first header, a second header, a flat tube connecting the first header and the second header, and between adjacent flat tubes fins; the first header includes a header tube body and a circulation hole for refrigerant to enter and exit the first header tube; the header tube body is provided with a number of flat tube holes, and its characteristics are: The method consists in that: the first header is provided with a partition component extending longitudinally along the header tube body, the partition component includes a main partition and a secondary partition, and the main partition separates the header tube. The body is divided into a first cavity and a second cavity, and at least one set of shunt holes is provided on the main partition; the first cavity is provided close to one side of the flat tube, and one end of the flat tube The end extends into the first cavity; the auxiliary partition divides the second cavity into at least two relatively independent flow chambers extending longitudinally along the header body, and the first The cavity is connected to at least one of the flow chambers through the diverting holes provided on the main partition.

2. The microchannel heat exchanger according to claim 1, characterized in that: the first header is further provided with a second partition, and in the longitudinal direction of the header body, the second The partition divides the first cavity into at least two relatively independent distribution chambers, each of the distribution chambers is connected to a group of the flat tubes; and at least one of the distribution chambers is not directly connected to all the distribution chambers. The flow hole is connected to the flow chamber through the branch hole provided on the main partition, thereby indirectly connecting to the flow hole.

3. The microchannel heat exchanger according to claim 2, characterized in that: the flow hole is provided at one end of the first header, and the branching hole corresponding to one of the flow chambers is provided at the The relatively far end of the main partition away from the end where the circulation hole is located, the distribution chamber connected to the circulation chamber is not directly connected to the circulation hole, but is connected to the distribution chamber provided on the main partition through the The branching hole communicates with the flow chamber and thereby indirectly communicates with the flow hole.

4. The microchannel heat exchanger according to claim 1, characterized in that: the header tube body is a combined type, the header tube body includes a first tube body and a second tube body, The first tube body is provided with a flat tube hole connected to the flat tube, and the first tube body and the flat tube are fixed by welding; the first tube body and the second tube body are fixed by welding; the The second pipe body and the partition part are formed as an integral profile and have a flow cavity.

5. The microchannel heat exchanger according to claim 1, characterized in that: the first header further includes a distribution chamber, and the distribution chamber is provided in the first header where the flow hole is provided. On one side, the distribution chamber communicates with the flow hole and the flow chamber.

6. The microchannel heat exchanger according to claim 5, characterized in that: the first header is provided with a first end cover at one end close to the flow hole, and the end of one end of the main partition is The main partition is in contact with the inner surface of the first end cover, the main partition separates the first cavity and the second cavity, and the inner surface of the first end cover is at a distance from the auxiliary partition. There is a certain distance between the plates to form the distribution cavity. The flow hole is directly connected to the distribution cavity. The distribution cavity is connected to the flow cavity. The first cavity and the distribution cavity are not directly connected but pass through. The flow chamber is connected.

7. The microchannel heat exchanger according to claim 5, characterized in that: the first header is provided with a first end cap at one end where the flow hole is provided, and the inner surface of the first end cap There is a certain distance from the separation component to form the distribution cavity, and an isolation element is also provided in the first header, and the isolation element is in contact with one end of the main partition of the separation component close to the flow hole, The isolation element isolates the distribution chamber and the first chamber, the distribution chamber is connected to the flow chamber, and the first cavity and the distribution chamber are not directly connected but are connected through the flow chamber.

8. The microchannel heat exchanger according to claim 7, characterized in that: the isolation element is one of the second partition plates provided at one end of the main partition plate close to the flow hole, A second partition is in contact with the header tube body and the main partition plate of the partition component, and is connected directly after assembly, so that the header tube body, the second partition and the A first end cap forms the distribution chamber.

9. The microchannel heat exchanger according to claim 1, characterized in that: the main partition and the auxiliary partition are plate-like structures extending longitudinally along the first header, and each flow chamber It is connected to the first cavity through multiple sets of splitting holes, and each group of splitting holes is arranged along the longitudinal direction of the main partition; the number of groups of splitting holes is consistent with the number of the flow chamber. The quantity is the same.

10. The microchannel heat exchanger according to claim 9, characterized in that: the number of the main partition is one, and the edge of the main partition is in contact with and fixed to the inner wall of the header body, Thus, the main partition divides the header body into the first cavity and the second cavity; the auxiliary partition is disposed in the second cavity, and the auxiliary partition One edge of the plate is in contact with and fixed on the lower surface of the main partition, and the other edge of the auxiliary partition is in contact with and fixed on the inner wall of the header body; the auxiliary partition and the main partition And at least two flow chambers are formed between the inner walls of the header tube body.

11. The microchannel heat exchanger according to claim 9, characterized in that: the number of the main partitions is two, and the two main partitions are in contact with the auxiliary partitions and form a Y-shaped arrangement, wherein Each of the two main partitions has an edge that contacts the inner wall of the header body and forms a contact surface, thereby dividing the header body into the first cavity and the second cavity. body, the auxiliary partition is provided in the second cavity, and one edge thereof is in contact with the inner wall of the second cavity, so that the second cavity is divided into two by the auxiliary partition. flow chamber.

12. The microchannel heat exchanger according to claim 1, characterized in that: the first header further includes a flow guide element for introducing refrigerant into each of the flow chambers; The flow element includes a base plate and a frame. The outer surface of the frame is in contact with and fixed to the inner surface of the header body. The base plate includes a flow guide area and a flow area. The bottom surface of the flow guide area is in contact with the inner surface of the header body. The partition member contacts at one end close to the circulation hole to prevent refrigerant from passing through the circulation hole. Directly enter the first cavity; the flow area is a through hole provided on the bottom plate corresponding to the flow cavity.

13. The microchannel heat exchanger according to claim 12, characterized in that: the flow guide area is provided with a convex block, and the convex block protrudes from the bottom plate of the flow guide element toward the direction of the flow hole. The protruding block divides the flow guide area of the bottom plate into fluid channels corresponding to the number of the flow chambers, and introduces refrigerant into each of the flow chambers.

14. A method of manufacturing a microchannel heat exchanger. The microchannel heat exchanger includes a first header and a second header. The first header and the second header are connected to each other. flat tubes, and fins between adjacent flat tubes; the first header includes a header tube body, a flow hole for refrigerant to enter and exit the header tube body, and inside the first header tube A separation component is provided that extends longitudinally along the header body. The separation component includes a main partition and an auxiliary partition. The main partition is provided with a shunt hole; the header body is a combined type. , the collector tube body includes a first tube body and a second tube body, the first tube body is provided with a flat tube hole, the first tube body and the second tube body pass through; t dry connection Phase fixed; The partition component and the second tube body are fixedly arranged and form at least two flow chambers; The processing of the microchannel heat exchanger includes the following steps:

51. Parts processing: Process and shape various parts of the microchannel heat exchanger, and then assemble them to form a heat exchanger assembly;

52. The heat exchanger assembly is integrally welded and formed by furnace welding. The heat exchanger assembly at least includes a first tube body, a partition, a second tube body, a flat tube, a fin, and a second header; Among them, step S1 includes the following sub-steps:

S11, the first tube body forming: the plate is cut and punched at the same time to form a flat tube hole; or the first tube body is formed and punched at the same time to form a flat tube hole; or profile processing is used, and the material is cut and processed according to the length. Both ends and the flat tube hole are formed into a flat tube hole or the flat tube hole is completed at the same time by blanking processing;

512, Second pipe body forming: cut the plate and process it into shape; or use profile processing, cut the material according to the length and process the two ends to form;

513, Processing of separate parts: Using profile processing, including cutting materials according to length and processing both ends and processing shunt holes; or completing the processing of shunt holes while cutting materials;

514. Assemble and fix the formed first pipe body, second pipe body and dividing parts.

15. The manufacturing method of a microchannel heat exchanger according to claim 14, characterized in that: in the sub-step of S1, S13 also includes the forming of a second partition, and S11 includes processing the partition on the first tube body. The step S14 includes inserting the second partition plate into the partition plate installation hole provided on the first pipe body.

16. The manufacturing method of a microchannel heat exchanger according to claim 14, characterized in that: the second tube body and the partition member are integrally formed profiles and have a flow cavity; wherein step S1 includes the following sub-steps: Steps:

511, the first tube body forming: blanking the plate and completing the punching and forming to form a flat tube hole; or the first tube body is formed and punching is completed at the same time to form a flat tube hole; or profile processing is used, and the material is cut and processed according to the length Both ends and flat tube holes;

512, Processing of the second pipe body and dividing parts: Cut out the profile material, process both ends and complete the processing of the diverter hole; or complete the processing of the diverter hole while blanking;

513. Assemble and fix the formed assembly of the second pipe body and the partition part and the first pipe body.