Micro-channel heat exchanger and assembling method thereof

Abstract

The invention provides a micro-channel heat exchanger and an assembling method thereof, the micro-channel heat exchanger comprises a first collecting pipe and a second collecting pipe which are oppositely arranged, the inner side of the first collecting pipe and the inner side of the second collecting pipe are each provided with a plurality of comb teeth, and the comb teeth are arranged at intervals. An inclined face is arranged on one side of each comb tooth, and a flat pipe is placed on the inclined face of each comb tooth. The two ends of each flat pipe penetrate through the corresponding inclined faces respectively and are inserted into the first collecting pipe or the second collecting pipe. And a plurality of flat tubes are placed on the inclined surfaces of the comb teeth at one time by utilizing the positioning effect of the comb teeth on the flat tubes. And then the multiple flat pipes are pulled, so that the multiple flat pipes are changed from horizontal arrangement to vertical arrangement. And the comb teeth are pushed to move until the distance between every two adjacent flat pipes is shortened to the distance required by assembly of the flat pipes, and then the two ends of the flat pipes are inserted into the first collecting pipe and the second collecting pipe correspondingly. The efficiency of assembling the micro-channel heat exchanger is improved, and the consistency of a plurality of micro-channel heat exchangers is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of microchannel technology, and in particular to a microchannel heat exchanger and an assembly method thereof. Background Art

[0002] The microchannel is composed of a collecting tube, flat tubes, fins and other parts. During the production process, the flat tubes need to be placed one by one, and arranged in order with a fixed gap between every two, and then the collecting tubes at both ends are installed. Before installing the collecting tube, the positioning strips and positioning rods are pre-inserted to ensure that each flat tube is inserted into the corresponding notch of the collecting tube. Finally, the two collecting tubes are evenly squeezed by external force to ensure the insertion depth of the flat tubes, and evenly resist the flat tubes inserted in the collecting tube, that is, to ensure that the depth of each flat tube inserted into the collecting tube is consistent.

[0003] The entire operation process is cumbersome, difficult, and has low production efficiency. It requires 12 people to operate it. In addition, there are many defective products in the production process, and product consistency and quality are difficult to control.

[0004] Therefore, there is a need for a microchannel heat exchanger that can realize the integrated assembly of flat tubes and fins and an assembly method thereof. Summary of the invention

[0005] In order to overcome the problems existing in the related art, one of the objectives of the present invention is to provide a microchannel heat exchanger which can realize the integrated assembly of flat tubes and fins.

[0006] A microchannel heat exchanger comprises a first header and a second header which are arranged opposite to each other, wherein a plurality of comb teeth are arranged on the inner side of the first header and the second header, and the plurality of comb teeth are arranged at intervals; an inclined surface is arranged on one side of the comb teeth, and a flat tube is placed on the inclined surface of each comb tooth; two ends of the flat tube respectively pass through the corresponding inclined surfaces and are inserted into the first header or the second header.

[0007] In a preferred technical solution of the present invention, a first mounting groove is provided on a side of the first collecting pipe close to the second collecting pipe, and the first end of the flat tube is inserted into the first mounting groove; a second mounting groove is provided on a side of the second collecting pipe close to the first collecting pipe, and the second end of the flat tube is inserted into the second mounting groove.

[0008] In a preferred technical solution of the present invention, fins are installed between adjacent flat tubes.

[0009] In a preferred technical solution of the present invention, both ends of the first collecting pipe are connected with first end covers, the first end covers are used to seal the first collecting pipe, and both ends of the second collecting pipe are connected with second end covers, the second end covers are used to seal the second collecting pipe.

[0010] In a preferred technical solution of the present invention, the microchannel heat exchanger further includes a spacer, which is vertically inserted into the first header and the second header, and the spacer is used to guide the refrigerant to flow into the flat tube.

[0011] In a preferred technical solution of the present invention, N flat tubes are connected between the first current collecting pipe and the second current collecting pipe, and the N flat tubes are parallel to each other; the first ends of the N flat tubes are connected to the first current collecting pipe, and the second ends of the N flat tubes are connected to the second current collecting pipe.

[0012] In a preferred technical solution of the present invention, the microchannel heat exchanger further includes a bending structure, and the bending structure is connected to or integrally formed with the outermost flat tube.

[0013] In a preferred technical solution of the present invention, a branch pipe inlet and a branch pipe outlet are provided on a side of the first header away from the second header, and the refrigerant flows in from the branch pipe inlet and flows out from the branch pipe outlet.

[0014] In a preferred technical solution of the present invention, the comb teeth include a slider and a supporting portion, the supporting portion is plugged into the slider, and the inclined surface is provided at one end of the supporting portion away from the slider.

[0015] In a preferred technical solution of the present invention, the height difference of the inclined surface is equal to the thickness of the flat tube.

[0016] A second object of the present invention is to provide a method for assembling a microchannel heat exchanger. Based on any of the microchannel heat exchangers described above, the method comprises:

[0017] Placing N of the flat tubes on the inclined surface of the comb teeth so that the N flat tubes are evenly arranged on the assembly station in the horizontal direction;

[0018] Pulling the N flat tubes to convert the N flat tubes from a horizontal arrangement to a vertical arrangement;

[0019] The first collecting pipe and the second collecting pipe are installed, and the first ends of the N flat tubes are inserted into the first installation grooves, and the second ends of the N flat tubes are inserted into the second installation grooves.

[0020] In a preferred technical solution of the present invention, after pulling the N flat tubes to convert the N flat tubes from a horizontal arrangement to a vertical arrangement, the method further includes:

[0021] Inserting the fins one by one between two adjacent flat tubes;

[0022] The plurality of fins are flattened so that the height difference between the plurality of fins is smaller than a height difference threshold.

[0023] In a preferred technical solution of the present invention, after flattening the plurality of fins so that the height difference between the plurality of fins is less than the height difference threshold, the method further comprises:

[0024] An air cylinder is used to push the plurality of comb teeth to move until the interval between adjacent comb teeth is reduced to a target interval.

[0025] The beneficial effects of the present invention are:

[0026] The present invention provides a microchannel heat exchanger, comprising a first header and a second header arranged oppositely, wherein the inner sides of the first header and the second header are both provided with a plurality of comb teeth, and the plurality of comb teeth are arranged at intervals; a slope is provided on one side of the comb teeth, and a flat tube is placed on the slope of each comb tooth; and the two ends of the flat tube respectively pass through the corresponding slopes and are inserted into the first header or the second header. A plurality of comb teeth are provided, and the plurality of flat tubes are placed on the slopes of the plurality of comb teeth at one time by using the positioning effect of the comb teeth on the flat tubes. Then the plurality of flat tubes are pulled so that the plurality of flat tubes are converted from horizontal arrangement to vertical arrangement. The plurality of comb teeth are pushed to move, and the plurality of flat tubes are driven to move in a direction of approaching each other by pushing the plurality of comb teeth to move, so as to shorten the distance between the two adjacent flat tubes. Until the distance between the two adjacent flat tubes is shortened to the distance required for the assembly of the flat tubes. Then the first ends of the plurality of flat tubes are inserted into the first header, and the second ends of the plurality of flat tubes are inserted into the second header. In the above process, multiple comb teeth are used to place and arrange multiple flat tubes at one time, thereby realizing the integrated assembly of the flat tubes. There is no need to place the flat tubes one by one, which optimizes the operation process. This not only improves the efficiency of assembling microchannel heat exchangers, but also ensures the consistency of multiple microchannel heat exchangers and improves the quality of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a top view of the microchannel heat exchanger of the present invention;

[0028] Figure 2 is a front view of the microchannel heat exchanger of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the comb teeth of the present invention;

[0030] Figure 4 It is a front view of the comb teeth of the present invention;

[0031] Figure 5 is a side view of the comb teeth of the present invention;

[0032] Figure 6 is a top view of the comb teeth of the present invention;

[0033] Figure 7 It is a flow chart of the assembly method of the microchannel heat exchanger of the present invention.

[0034] Figure numerals: 1. first collecting pipe; 2. second collecting pipe; 3. comb teeth; 4. inclined plane; 5. flat tube; 6. first mounting groove; 7. second mounting groove; 8. fin; 9. first end cover; 10. second end cover; 11. spacer; 12. bending structure; 13. branch pipe inlet; 14. branch pipe outlet; 15. supporting part; 16. slider. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0036] Example 1

[0037] like Figure 1-Figure 6 As shown, this embodiment provides a microchannel heat exchanger, including a first header 1 and a second header 2 arranged opposite to each other, wherein a plurality of comb teeth 3 are arranged on the inner sides of the first header 1 and the second header 2, and the plurality of comb teeth 3 are arranged at intervals; a slope 4 is arranged on one side of the comb teeth 3, and a flat tube 5 is placed on the slope 4 of each of the comb teeth 3; both ends of the flat tube 5 respectively pass through the corresponding slope 4 and are inserted into the first header 1 or the second header 2.

[0038] The comb teeth 3 include a first row of comb teeth 3 and a second row of comb teeth 3 that are arranged opposite to each other. The first row of comb teeth 3 and the second row of comb teeth 3 are aligned one by one. The spacing between every two comb teeth 3 is equal. The first row of comb teeth 3 is arranged on the inner side of the first header 1, and the second row of comb teeth 3 is arranged on the inner side of the second header 2. Preferably, the two rows of comb teeth 3 can also be arranged on the bundling table, with the first row of comb teeth 3 being arranged close to the first header 1, and the second row of comb teeth 3 being arranged close to the second header 2.

[0039] The plurality of comb teeth 3 are movable, and can simultaneously push the plurality of comb teeth 3 to move. When the plurality of comb teeth 3 move, they can move closer to or farther from each other, so that the distance between two comb teeth 3 increases or decreases. When the comb teeth 3 move, the flat tubes 5 are driven to move, so that the distance between the flat tubes 5 increases or decreases as the comb teeth 3 move.

[0040] The initial spacing of the comb teeth 3 is larger than the target spacing, and the flat tubes 5 are placed horizontally on the inclined surfaces 4 of the comb teeth 3, and the inclined surfaces 4 of the comb teeth 3 correspond to the flat tubes 5 one by one. Since the spacing between the comb teeth 3 is equal, multiple flat tubes 5 can be evenly arranged on the bundling table. Pulling multiple flat tubes 5 at one time can convert the multiple flat tubes 5 from horizontal arrangement to vertical arrangement, and realize one-click installation and placement of the flat tubes 5. At this time, by pushing the multiple comb teeth 3 to move, the spacing between two adjacent comb teeth 3 is gradually reduced to the target spacing. The comb teeth 3 drive the flat tubes 5 to approach each other, so that the spacing between adjacent flat tubes 5 is shortened to the size required for assembly, thereby realizing the automatic placement of multiple flat tubes 5.

[0041] A microchannel heat exchanger of this embodiment comprises a first header 1 and a second header 2 arranged oppositely, wherein a plurality of comb teeth 3 are arranged on the inner side of each of the first header 1 and the second header 2, and the plurality of comb teeth 3 are arranged at intervals; a slope 4 is arranged on one side of the comb teeth 3, and a flat tube 5 is placed on the slope 4 of each of the comb teeth 3; both ends of the flat tube 5 pass through the corresponding slope 4, and are inserted into the first header 1 or the second header 2. A plurality of comb teeth 3 are arranged, and the plurality of flat tubes 5 are placed on the slope 4 of the plurality of comb teeth 3 at one time by using the positioning effect of the comb teeth 3 on the flat tube 5. Then the plurality of flat tubes 5 are pulled so that the plurality of flat tubes 5 are converted from horizontal arrangement to vertical arrangement. The plurality of comb teeth 3 are pushed to move, and the plurality of flat tubes 5 are driven to move in a direction close to each other by pushing the plurality of comb teeth 3 to move, so as to shorten the distance between two adjacent flat tubes 5. Until the distance between two adjacent flat tubes 5 is shortened to the distance required for the assembly of the flat tubes 5. Then, the first ends of the plurality of flat tubes 5 are inserted into the first header 1, and the second ends of the plurality of flat tubes 5 are inserted into the second header 2. In the above process, the plurality of flat tubes 5 are placed and arranged at one time using the plurality of comb teeth 3, thereby realizing the integrated assembly of the flat tubes 5, eliminating the need to place the flat tubes 5 one by one, optimizing the operation process, and not only improving the efficiency of assembling the microchannel heat exchanger, but also ensuring the consistency of the plurality of microchannel heat exchangers, thereby improving the quality of the product.

[0042] Example 2

[0043] like Figure 1-Figure 6 As shown, this embodiment provides a microchannel heat exchanger, including a first header 1 and a second header 2 arranged opposite to each other, wherein a plurality of comb teeth 3 are arranged on the inner sides of the first header 1 and the second header 2, and the plurality of comb teeth 3 are arranged at intervals; a slope 4 is arranged on one side of the comb teeth 3, and a flat tube 5 is placed on the slope 4 of each of the comb teeth 3; both ends of the flat tube 5 respectively pass through the corresponding slope 4 and are inserted into the first header 1 or the second header 2.

[0044] A first mounting groove 6 is provided on a side of the first collecting pipe 1 close to the second collecting pipe 2, and the first end of the flat tube 5 is inserted into the first mounting groove 6; a second mounting groove 7 is provided on a side of the second collecting pipe 2 close to the first collecting pipe 1, and the second end of the flat tube 5 is inserted into the second mounting groove 7.

[0045] Both ends of the first header 1 are connected with first end covers 9 for sealing the first header 1 , and both ends of the second header 2 are connected with second end covers 10 for sealing the second header 2 .

[0046] A plurality of first mounting grooves 6 are provided on one side of the first header 1, and the plurality of first mounting grooves 6 are arranged in a row, and the number of the first mounting grooves 6 is the same as the number of the flat tubes 5, so that the first ends of the plurality of flat tubes 5 can be simultaneously inserted into the plurality of first mounting grooves 6. A plurality of second mounting grooves 7 are provided on one side of the second header 2 close to the first header 1, and the plurality of second mounting grooves 7 are arranged in a row, and the number of the second mounting grooves 7 is the same as the number of the flat tubes 5, so that the second ends of the plurality of flat tubes 5 can be simultaneously inserted into the plurality of second mounting grooves 7.

[0047] After the two ends of the plurality of flat tubes 5 are respectively inserted into the first header 1 and the second header 2, the two ends of the plurality of flat tubes 5 are respectively connected to the first header 1 and the second header 2. Two first end covers 9 are provided, and the two first end covers 9 respectively seal the two ends of the first header 1. Two second end covers 10 are provided, and the two second end covers 10 respectively seal the two ends of the second header 2, so that the interior of the first header 1 and the second header 2 are sealed. The first header 1 and the second header 2 also have the function of changing the flow direction of the refrigerant, so that the refrigerant flows according to the set path. After the refrigerant flows into the first header 1, it flows into the second header 2 through the plurality of flat tubes 5, and then the refrigerant flows back to the first header 1, and then flows into the second header 2 through the plurality of flat tubes 5, and then the refrigerant flows back to the first header 1, and then the above process is repeated, and finally the refrigerant flows out from the first header 1.

[0048] A first positioning platform assembly is provided near the first manifold 1, and the first positioning platform assembly is used to push the first manifold 1 toward the first end of the flat tube 5, so that the first end of the flat tube 5 is inserted into the first mounting groove 6. A second positioning platform assembly is provided near the second manifold 2, and the second positioning platform assembly is used to push the second manifold 2 toward the second end of the flat tube 5, so that the second end of the flat tube 5 is inserted into the second mounting groove 7. The first positioning platform assembly and the second positioning platform assembly work simultaneously, so that the first manifold 1 and the second manifold 2 are simultaneously close to both ends of the flat tube 5, so that both ends of the flat tube 5 are simultaneously inserted into the first manifold 1 and the second manifold 2.

[0049] In this embodiment, the first manifold 1 is provided with a first mounting groove 6 on one side close to the second manifold 2, and the first end of the flat tube 5 is inserted into the first mounting groove 6; the second manifold 2 is provided with a second mounting groove 7 on one side close to the first manifold 1, and the second end of the flat tube 5 is inserted into the second mounting groove 7. The first manifold 1 is connected with a first end cap 9 at both ends, and the first end cap 9 is used to seal the first manifold 1; the second manifold 2 is connected with a second end cap 10 at both ends, and the second end cap 10 is used to seal the second manifold 2. By installing the first sealing cap at both ends of the first manifold 1 and the second sealing cap at both ends of the second manifold 2, the interiors of the first manifold 1 and the second manifold 2 are sealed. Both the first manifold 1 and the second manifold 2 can guide the refrigerant so that the refrigerant flows along a set path. After the refrigerant flows into the first header 1, it flows into the second header 2 through the plurality of flat tubes 5, then flows back to the first header 1, then flows into the second header 2 through the plurality of flat tubes 5, then flows back to the first header 1, repeats the above process, and finally the refrigerant flows out of the first header 1. The first positioning platform assembly is used to push the first header 1, and the second positioning platform assembly is used to push the second header 2, so that the two ends of the flat tube 5 are respectively inserted into the first header 1 and the second header 2, which not only ensures the depth of the two ends of the flat tube 5 inserted into the first header 1 and the second header 2, but also improves the efficiency of assembling the flat tube 5 and reduces the labor intensity of employees.

[0050] Example 3

[0051] like Figure 1-Figure 6 As shown, this embodiment provides a microchannel heat exchanger, including a first header 1 and a second header 2 arranged opposite to each other, wherein a plurality of comb teeth 3 are arranged on the inner sides of the first header 1 and the second header 2, and the plurality of comb teeth 3 are arranged at intervals; a slope 4 is arranged on one side of the comb teeth 3, and a flat tube 5 is placed on the slope 4 of each of the comb teeth 3; both ends of the flat tube 5 respectively pass through the corresponding slope 4 and are inserted into the first header 1 or the second header 2.

[0052] Fins 8 are installed between adjacent flat tubes 5 . The fins 8 are composed of a plurality of sawtooth structures with triangular cross-sections. The plurality of sawtooth structures are closely arranged so that the fins 8 have a larger contact area with the flat tubes 5 on both sides, thereby improving the heat dissipation efficiency of the fins 8 on the flat tubes 5 .

[0053] N flat tubes 5 are connected between the first current collecting pipe 1 and the second current collecting pipe 2 , and the N flat tubes 5 are parallel to each other; the first ends of the N flat tubes 5 are connected to the first current collecting pipe 1 , and the second ends of the N flat tubes 5 are connected to the second current collecting pipe 2 .

[0054] The microchannel heat exchanger further includes a bending structure 12 , and the bending structure 12 is connected to or integrally formed with the outermost flat tube 5 .

[0055] The comb teeth 3 include a slider 16 and a supporting portion 15 . The supporting portion 15 is plugged into the slider 16 . The end of the supporting portion 15 away from the slider 16 is provided with the inclined surface 4 . The height difference of the inclined surface 4 is equal to the thickness of the flat tube 5 .

[0056] The shape of the comb tooth 3 is L-shaped, and the comb tooth 3 includes a slider 16 and a supporting portion 15, and the supporting portion 15 is inserted into the slider 16. The end of the supporting portion 15 away from the slider 16 is inclined toward the end close to the slider 16 to form an inclined surface 4. The height difference of the inclined surface 4 is equal to the thickness of the flat tube 5, and each flat tube 5 is placed on the inclined surface 4 of the corresponding comb tooth 3.

[0057] A fin 8 is installed between two adjacent flat tubes 5. The width of the fin 8 is equal to the distance between the two adjacent flat tubes 5. The height difference between the two adjacent fins 8 does not exceed 0.5 mm, where mm refers to millimeters. When the refrigerant flows through the flat tubes 5, since the fins 8 are close to the flat tubes 5, the heat of the refrigerant is transferred to the fins 8 through the flat tubes 5, that is, each fin 8 plays a heat dissipation role for the flat tubes 5 on both sides.

[0058] The first ends of the N flat tubes 5 are inserted into the first mounting grooves 6 of the first header 1, and the second ends are inserted into the second mounting grooves 7 of the second header 2. The refrigerant flows from the first header 1 into the P1 flat tubes 5, and then into the second header 2. After flowing for a distance in the second header 2, the refrigerant flows from the second header 2 into the P2 flat tubes 5, and then flows back to the first header 1. N≥2, P1<N, P1=P2.

[0059] A bending structure 12 is provided on both sides of the N flat tubes 5, that is, a bending structure 12 is provided on one side of the two outermost flat tubes 5 away from the central flat tube 5. The bending structure 12 plays a protective role, which can protect the inner flat tubes 5 and fins 8 from being squeezed by the external structure and prevent the flat tubes 5 and fins 8 from colliding with the external structure.

[0060] In this embodiment, fins 8 are installed between adjacent flat tubes 5, and the microchannel heat exchanger also includes a bending structure 12, which is connected to or integrally formed with the outermost flat tube 5. The bending structure 12 plays a protective role, which can protect the inner flat tube 5 and fin 8 from being squeezed by the external structure, and prevent the flat tube 5 and fin 8 from colliding with the external structure. The comb teeth 3 include a slider 16 and a supporting portion 15, and the supporting portion 15 is inserted into the slider 16. The end of the supporting portion 15 away from the slider 16 is provided with the inclined surface 4, and the height difference of the inclined surface 4 is equal to the thickness of the flat tube 5. The end of the supporting portion 15 away from the slider 16 is inclined toward the end close to the slider 16 to form the inclined surface 4. The height difference of the inclined surface 4 is equal to the thickness of the flat tube 5, and each flat tube 5 is placed on the inclined surface 4 of the corresponding comb teeth 3.

[0061] Example 4

[0062] like Figure 1-Figure 6 As shown, this embodiment provides a microchannel heat exchanger, including a first header 1 and a second header 2 arranged opposite to each other, wherein a plurality of comb teeth 3 are arranged on the inner sides of the first header 1 and the second header 2, and the plurality of comb teeth 3 are arranged at intervals; a slope 4 is arranged on one side of the comb teeth 3, and a flat tube 5 is placed on the slope 4 of each of the comb teeth 3; both ends of the flat tube 5 respectively pass through the corresponding slope 4 and are inserted into the first header 1 or the second header 2.

[0063] The microchannel heat exchanger further includes a spacer 11 , which is vertically inserted into the second header 2 , and is used to guide the refrigerant to flow into the flat tube 5 .

[0064] N flat tubes 5 are connected between the first current collecting pipe 1 and the second current collecting pipe 2 , and the N flat tubes 5 are parallel to each other; the first ends of the N flat tubes 5 are connected to the first current collecting pipe 1 , and the second ends of the N flat tubes 5 are connected to the second current collecting pipe 2 .

[0065] A branch pipe inlet 13 and a branch pipe outlet 14 are formed on a side of the first header 1 away from the second header 2 . The refrigerant flows in from the branch pipe inlet 13 and flows out from the branch pipe outlet 14 .

[0066] The spacer 11 is vertically inserted into the first header 1 and the second header 2. The spacer 11 blocks the refrigerant and changes the flow direction of the refrigerant at the same time. That is, when the refrigerant in the first header 1 encounters the spacer 11 during the flow, it stops flowing along the first header 1 and flows into the flat tube 5 instead, and then flows into the second header 2 from the flat tube 5. The inside of the flat tube 5 is hollow, allowing the refrigerant to flow through. When the refrigerant in the second header 2 encounters the spacer 11 during the flow, it stops flowing along the second header 2 and flows into the flat tube 5 instead, and then flows into the first header 1 from the flat tube 5.

[0067] Fins 8 are provided between adjacent flat tubes 5, and the fins 8 have a heat dissipation effect on the refrigerant in the flat tubes 5. The spacers 11 are used to change the flow direction of the refrigerant so that the refrigerant flows from the first header 1 or the second header 2 into the flat tubes 5, so that the fins 8 take away part of the heat of the refrigerant in the flat tubes 5.

[0068] The shape of the spacer 11 can be an L-shaped flow-guiding structure, or can be other shapes, which are not limited here.

[0069] N flat tubes 5 are arranged between the first header 1 and the second header 2 at intervals, and the N flat tubes 5 are parallel to each other. The first header 1 and the second header 2 extend in a first direction, and the flat tubes 5 extend in a second direction. There is a certain angle between the first direction and the second direction. In this embodiment, the first direction is perpendicular to the second direction as an example.

[0070] The end surface of the flat tube 5 is provided with a plurality of small holes, and the cross-sectional shape of the small holes is circular or rectangular, which is not limited here. The plurality of small holes correspond to the plurality of flow channels, and the refrigerant flows into the plurality of flow channels from the plurality of small holes on the end surface of the flat tube 5, thereby increasing the contact area between the refrigerant and the inner wall of the flat tube 5, and better dissipating the heat of the refrigerant. In addition, splitting a wider flow channel into a plurality of flow channels can prevent energy loss caused by turbulence caused by the refrigerant flowing in a wider flow channel.

[0071] The number N of the flat tubes 5 is set according to the length of the first header 1 and the second header 2 and the heat dissipation requirement, where N≥2.

[0072] The branch pipe inlet 13 and the branch pipe outlet 14 are parallel to each other. The branch pipe outlet 14 is connected to some of the flat tubes 5. The branch pipe inlet 13 is used for the refrigerant to flow into the first header 1, and the branch pipe outlet 14 is used for the refrigerant to flow out of the first header 1. The refrigerant flows into the first header 1 from the branch pipe inlet 13, and then flows into the second header 2 through the plurality of flat tubes 5. The refrigerant flows for a distance in the second header 2, and then flows into the first header 1 through the plurality of flat tubes 5. The refrigerant flows for a distance in the first header 1 toward the branch pipe outlet 14, and then flows into the second header 2 through the plurality of flat tubes 5. The above process is repeated until the refrigerant flows into the branch pipe outlet 14 from the plurality of flat tubes 5.

[0073] The microchannel heat exchanger of this embodiment further includes a diaphragm 11, which is vertically inserted into the first header 1 and the second header 2, and is used to guide the refrigerant to flow into the flat tube 5. The first header 1 is provided with a branch pipe inlet 13 and a branch pipe outlet 14 on the side away from the second header 2, and the refrigerant flows in from the branch pipe inlet 13 and flows out from the branch pipe outlet 14. The diaphragm 11 is vertically inserted into the first header 1 and the second header 2, and the diaphragm 11 plays the role of blocking the refrigerant and changing the flow direction of the refrigerant at the same time, that is, when the refrigerant in the first header 1 encounters the diaphragm 11 during the flow, it stops flowing along the first header 1, and flows into the flat tube 5 instead, and then flows into the second header 2 from the flat tube 5. The interior of the flat tube 5 is hollow, and the refrigerant can flow through. When the refrigerant in the second header 2 encounters the diaphragm 11 during the flow, it stops flowing along the second header 2, and flows into the flat tube 5 instead, and then flows into the first header 1 from the flat tube 5.

[0074] Example 5

[0075] like Figure 7 As shown, this embodiment provides an assembly method of a microchannel heat exchanger, based on the microchannel heat exchanger described in any one of Embodiments 1 to 4, the method comprises:

[0076] S1: placing N of the flat tubes on the inclined surface of the comb teeth, so that the N of the flat tubes are evenly arranged on the assembly station in the horizontal direction.

[0077] S2: Pull the N flat tubes to convert the N flat tubes from a horizontal arrangement to a vertical arrangement.

[0078] S3: Install the first header and the second header, insert the first ends of the N flat tubes into the first installation grooves, and insert the second ends of the N flat tubes into the second installation grooves.

[0079] After pulling the N flat tubes so that the N flat tubes are converted from a horizontal arrangement to a vertical arrangement, the method further includes:

[0080] S21': inserting the fins one by one between two adjacent flat tubes.

[0081] S22': flattening the plurality of fins so that the height difference between the plurality of fins is less than a height difference threshold.

[0082] Two comb teeth 3 plates are placed, and the two comb teeth 3 plates are arranged facing each other. Each comb teeth 3 plate is provided with a plurality of comb teeth 3, and the comb teeth 3 are L-shaped structures. The comb teeth 3 include a slider and a supporting part, and the supporting part is plugged into the slider. The slider can slide along the extension direction of the comb teeth 3 plate, thereby changing the position of the comb teeth 3. The supporting part is in the shape of a rectangular parallelepiped, and an inclined surface 4 is provided at the end of the supporting part away from the slider, that is, the top of the comb teeth 3, and the height of the inclined surface 4 is equal to the thickness of the flat tube 5. In the initial state, the supporting part is arranged along the height direction, and the angle between the supporting part and the slider is 90 degrees.

[0083] The width of the slider is equal to the gap between two adjacent flat tubes 5. After placing two comb teeth 3 plates, each flat tube 5 is placed horizontally on the corresponding comb teeth 3. Pull once to evenly arrange multiple flat tubes 5. Pull again to flip the flat tube 5 from a horizontal state to a vertical state, so that the flat tube 5 is located in the gap between two adjacent comb teeth 3, thereby achieving one-click installation and placement of the flat tube 5. At this time, the gap between two adjacent comb teeth 3 is larger than the gap between two adjacent flat tubes 5, and there is a larger gap between two adjacent flat tubes 5. The operator puts the fin 8 into the gap between two adjacent flat tubes 5, achieving one-click installation and placement of the fin 8.

[0084] After flattening the plurality of fins so that the height difference between the plurality of fins is less than the height difference threshold, the method further includes:

[0085] An air cylinder is used to push the plurality of comb teeth to move until the interval between adjacent comb teeth is reduced to a target interval.

[0086] The fin 8 is installed between two adjacent flat tubes 5 so that the flat tubes 5 and the fin 8 are arranged at intervals, and then the cylinder is started to drive the slider of the comb teeth 3 to move. When the slider moves into place, it cannot move further, that is, the comb teeth 3 are limited after moving into place to prevent the fin 8 from being pinched and flattened. At this time, the spacing between adjacent comb teeth 3 is reduced to the target spacing.

[0087] There are multiple types of comb teeth 3. According to the sizes of the first header 1, the second header 2 and the flat tube 5, the appropriate comb teeth 3 are selected. After the flat tube 5 and the fin 8 are assembled together, the first header 1 and the second header 2 are placed, and the flat tube 5 is located between the first header 1 and the second header 2. The first header 1 is provided with a first mounting groove 6, and the second header 2 is provided with a second mounting groove 7. The two ends of the flat tube 5 are squeezed hard so that the first end of the flat tube 5 is inserted into the first mounting groove 6, and the second end of the flat tube 5 is inserted into the second mounting groove 7.

[0088] Preferably, positioning strips and positioning rods are used to position the process of inserting the flat tube 5 into the first installation groove 6 and the second installation groove 7, and the positioning strips and positioning rods are inserted into the first header 1 and the second header 2. The positioning rod abuts against the positioning strip to limit the positioning strip. The two ends of the flat tube 5 are squeezed hard so that the first end of the flat tube 5 abuts against the positioning strip in the first installation groove 6, and the second end of the flat tube 5 abuts against the positioning strip in the second installation groove 7, thereby ensuring that the depth of each flat tube 5 inserted into the first installation groove 6 and the second installation groove 7 is consistent. After fixing all the flat tubes 5, the positioning strips and positioning rods in the first header 1 and the second header 2 are pulled out.

[0089] Preferably, the flat tubes 5 and the fins 8 are assembled together, and the spacing between adjacent comb teeth 3 is reduced to the target spacing to obtain a microchannel heat exchanger. The microchannel heat exchanger is fixed with iron wire to prevent the fins 8 from falling off when the microchannel heat exchanger is moved, causing the microchannel heat exchanger structure to fall apart.

[0090] The present embodiment provides an assembly method for a microchannel heat exchanger, comprising placing N of the flat tubes 5 on the inclined surface 4 of the comb teeth 3, so that the N flat tubes 5 are evenly arranged on the assembly station in the horizontal direction. Pull the N flat tubes 5 to convert the N flat tubes 5 from a horizontal arrangement to a vertical arrangement. Install the first header 1 and the second header 2, insert the first ends of the N flat tubes 5 into the first installation groove 6, and insert the second ends of the N flat tubes 5 into the second installation groove 7. The width of the slider is equal to the gap between two adjacent flat tubes 5. After placing two comb teeth 3 plates, each flat tube 5 is placed horizontally on the corresponding comb teeth 3. Pull once to arrange multiple flat tubes 5 evenly, and then pull twice to flip the flat tubes 5 from a horizontal state to a vertical state, so that the flat tubes 5 are located in the gap between two adjacent comb teeth 3, thereby realizing one-button installation and placement of the flat tubes 5. At this time, the gap between two adjacent comb teeth 3 is larger than the gap between two adjacent flat tubes 5 , and there is a larger gap between the two adjacent flat tubes 5 . The operator puts the fin 8 into the gap between the two adjacent flat tubes 5 , realizing one-click installation and placement of the fin 8 .

[0091] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a restriction. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in the subsequent accompanying drawings.

[0092] It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would then be positioned "below" or "below" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0093] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A microchannel heat exchanger, characterized in that: It comprises a first collecting tube and a second collecting tube which are arranged opposite to each other, wherein a plurality of comb teeth are arranged on the inner side of the first collecting tube and the second collecting tube, and the plurality of comb teeth are arranged at intervals; an inclined surface is arranged on one side of the comb teeth, and a flat tube is placed on the inclined surface of each comb tooth; two ends of the flat tube respectively pass through the corresponding inclined surfaces and are inserted into the first collecting tube or the second collecting tube.

2. The microchannel heat exchanger according to claim 1, characterized in that: A first mounting groove is provided on a side of the first collecting pipe close to the second collecting pipe, and the first end of the flat tube is inserted into the first mounting groove; a second mounting groove is provided on a side of the second collecting pipe close to the first collecting pipe, and the second end of the flat tube is inserted into the second mounting groove.

3. The microchannel heat exchanger according to claim 1, characterized in that: Fins are installed between adjacent flat tubes.

4. The microchannel heat exchanger according to claim 1, characterized in that: Both ends of the first current collecting pipe are connected with first end covers, and the first end covers are used to seal the first current collecting pipe. Both ends of the second current collecting pipe are connected with second end covers, and the second end covers are used to seal the second current collecting pipe.

5. The microchannel heat exchanger according to claim 1, characterized in that: It also includes a spacer, which is vertically inserted into the first header and the second header, and is used to guide the refrigerant to flow into the flat tube.

6. The microchannel heat exchanger according to claim 1, characterized in that: N flat tubes are connected between the first current collecting pipe and the second current collecting pipe, and the N flat tubes are parallel to each other; the first ends of the N flat tubes are connected to the first current collecting pipe, and the second ends of the N flat tubes are connected to the second current collecting pipe.

7. The microchannel heat exchanger according to claim 3, characterized in that: It also includes a bending structure, which is connected to or integrally formed with the outermost flat tube.

8. The microchannel heat exchanger according to claim 1, characterized in that: A branch pipe inlet and a branch pipe outlet are provided on a side of the first header away from the second header, and the refrigerant flows in from the branch pipe inlet and flows out from the branch pipe outlet.

9. The microchannel heat exchanger according to claim 1, characterized in that: The comb teeth include a slider and a supporting portion. The supporting portion is plugged into the slider, and the inclined surface is arranged at one end of the supporting portion away from the slider.

10. The microchannel heat exchanger according to claim 9, characterized in that: The height difference of the inclined surface is equal to the thickness of the flat tube.

11. A method for assembling a microchannel heat exchanger, based on the microchannel heat exchanger according to any one of claims 1 to 10, the method comprising: Placing N of the flat tubes on the inclined surface of the comb teeth so that the N flat tubes are evenly arranged on the assembly station in the horizontal direction; Pulling the N flat tubes to convert the N flat tubes from a horizontal arrangement to a vertical arrangement; The first collecting pipe and the second collecting pipe are installed, and the first ends of the N flat tubes are inserted into the first installation grooves, and the second ends of the N flat tubes are inserted into the second installation grooves.

12. The method for assembling a microchannel heat exchanger according to claim 11, characterized in that: After pulling the N flat tubes so that the N flat tubes are converted from a horizontal arrangement to a vertical arrangement, the method further includes: Inserting the fins one by one between two adjacent flat tubes; The plurality of fins are flattened so that the height difference between the plurality of fins is smaller than a height difference threshold.

13. The method for assembling a microchannel heat exchanger according to claim 12, characterized in that: After flattening the plurality of fins so that the height difference between the plurality of fins is less than the height difference threshold, the method further includes: An air cylinder is used to push the plurality of comb teeth to move until the interval between adjacent comb teeth is reduced to a target interval.

Images