Micro-channel heat exchanger and air conditioner

Abstract

The utility model provides a microchannel heat exchanger and air conditioner, microchannel heat exchanger includes: first header pipe, first shunt pipe, first flat pipe, second shunt pipe and second header pipe, the first flat pipe is communicated between first shunt pipe and second shunt pipe, a plurality of second shunt pipe is communicated with second header pipe, and the second shunt pipe is communicated with the second header pipe. The first collecting pipe, the first shunting pipe, the first flat pipe, the second shunting pipe and the second collecting pipe are communicated in sequence; the first flow dividing pipes and the second flow dividing pipes are alternately arranged in the length direction of the first flow collecting pipes or the length direction of the second flow collecting pipes, the first flow dividing pipes are inserted between the two adjacent second flow dividing pipes, and the second flow dividing pipes are inserted between the two adjacent first flow dividing pipes. According to the micro-channel heat exchanger, the size of the flow dividing pipe in the length direction can be effectively reduced, the two flow dividing pipes are matched more compactly, the overall size is smaller, and the refrigerant filling amount of the micro-channel heat exchanger can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to a microchannel heat exchanger and an air conditioner. Background Art

[0002] Air conditioning provides a strong guarantee for a comfortable living environment, and its heat exchangers mainly include finned tube heat exchangers and microchannel heat exchangers. Compared with finned tube heat exchangers, microchannel heat exchangers can effectively reduce the amount of refrigerant injection and improve economic efficiency, and are widely concerned by enterprises and researched and developed. In the microchannel heat exchanger of patent CN115127367A, two rows of distribution pipes are connected to the flat tubes through the first connecting pipe, but the second distribution pipes in the two rows are arranged in a relative manner, which will cause the length of the distribution pipe to be longer, increase the overall refrigerant flow rate that needs to flow into the microchannel heat exchanger, and increase the amount of refrigerant injection; even the flat tubes are directly inserted into the collecting tube. Due to the flat shape of the flat tubes, the inner diameter of the collecting tube needs to be set larger, which also leads to an increase in the amount of refrigerant injection in the microchannel heat exchanger.

[0003] In addition, the existing microchannel heat exchanger has many branches, and the distributor pipe and microchannel flat tubes have resistance. When the heat exchanger is used as an evaporator, the distributor pipe has the problem of uneven flow distribution when distributing the microchannel flat tubes, which directly affects the heat exchange efficiency of the heat exchanger, resulting in increased power consumption, reduced economy and comfort. It is necessary to evenly distribute the refrigerant to each flat tube at the inlet.

[0004] Since the microchannel heat exchanger in the prior art has technical problems such as a large amount of refrigerant filling, the utility model studies and designs a microchannel heat exchanger and an air conditioner. Utility Model Content

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the microchannel heat exchanger in the prior art that the refrigerant filling amount is large, thereby providing a microchannel heat exchanger and an air conditioner.

[0006] In order to solve the above problems, the utility model provides a microchannel heat exchanger, which includes:

[0007] a first header, a first shunt tube, a first flat tube, a second shunt tube and a second header, wherein there are a plurality of first shunt tubes and a plurality of first flat tubes, the first shunt tubes are connected to the first flat tubes in a one-to-one correspondence, the plurality of first shunt tubes are arranged in sequence at intervals, and the plurality of first shunt tubes are all connected to the first header;

[0008] There are a plurality of second shunt tubes, and the second shunt tubes are also connected to the first flat tubes one by one. The first flat tubes are connected between the first shunt tube and the second shunt tube. The plurality of second shunt tubes are arranged in sequence and spaced apart, and the plurality of second shunt tubes are all connected to the second header, so that the first header, the first shunt tube, the first flat tube, the second shunt tube and the second header are connected in sequence.

[0009] Along the length direction of the first header or the length direction of the second header, the first shunt tubes and the second shunt tubes are alternately arranged, and the first shunt tube is inserted between two adjacent second shunt tubes, and the second shunt tube is inserted between two adjacent first shunt tubes.

[0010] In some embodiments,

[0011] It also includes an inlet pipe, one end of which is connected to the first header so that fluid can be introduced into the first header;

[0012] One end of the first shunt pipe is inserted into the first header and communicated with the first header;

[0013] One end of the second shunt pipe is inserted into the second header and communicated with the second header.

[0014] In some embodiments,

[0015] The partial pipe section of the first shunt pipe inserted into the first header is welded and connected to the first header, and the partial pipe section of the second shunt pipe inserted into the second header is welded and connected to the second header.

[0016] In some embodiments,

[0017] The first collecting tube and the second collecting tube are arranged opposite to each other in the horizontal direction, one end of the first shunt tube is inserted into the first collecting tube, the other end is blocked and opposite to the second collecting tube, and the other end of the first shunt tube is connected to or spaced apart from the second collecting tube; one end of the second shunt tube is inserted into the second collecting tube, the other end is blocked and opposite to the first collecting tube, and the other end of the second shunt tube is connected to or spaced apart from the first collecting tube; the first shunt tube and the second shunt tube are opposite to each other in the vertical direction.

[0018] In some embodiments,

[0019] The first collecting tube and the second collecting tube are staggered in the horizontal direction, and the first shunt tube and the second shunt tube are also staggered in the horizontal direction, so that the first shunt tube and the second shunt tube are not opposite to each other in the vertical direction, one end of the first shunt tube is inserted into the first collecting tube, and the other end is blocked and staggered with the second collecting tube; one end of the second shunt tube is inserted into the second collecting tube, and the other end is blocked and staggered with the first collecting tube.

[0020] In some embodiments,

[0021] The first flat tube is a U-shaped structure, and the U-shaped structure includes two parallel straight sections and a bent section, the bent section is connected between the two straight sections, one end of one straight section is connected to the first shunt pipe, and one end of the other straight section is connected to the second shunt pipe.

[0022] The first flat tubes are also provided with fins, and the fins are also connected between two adjacent first flat tubes.

[0023] In some embodiments,

[0024] It also includes a third shunt pipe, a second flat pipe, a fourth shunt pipe and a third header, wherein the second header is divided into a first pipe section and a second pipe section along its length direction, and the first pipe section is connected to a plurality of the second shunt pipes;

[0025] There are a plurality of third flow dividers, there are a plurality of second flat tubes, the third flow dividers are connected to the second flat tubes in a one-to-one correspondence, the plurality of third flow dividers are arranged in sequence at intervals, and the plurality of third flow dividers are all connected to the second tube section of the second header;

[0026] There are multiple fourth shunt tubes, and the fourth shunt tubes are also connected with the second flat tubes one by one. The second flat tubes are connected between the third shunt tube and the fourth shunt tube. The multiple fourth shunt tubes are arranged in sequence at intervals, and the multiple fourth shunt tubes are all connected with the third collecting tube, so that the second tube section of the second collecting tube, the third shunt tube, the second flat tube, the fourth shunt tube and the third collecting tube are connected in sequence.

[0027] In some embodiments,

[0028] Along the length direction of the second manifold or the length direction of the third manifold, the third shunt tube and the fourth shunt tube are alternately arranged, and the third shunt tube is inserted between two adjacent fourth shunt tubes, and the fourth shunt tube is inserted between two adjacent third shunt tubes.

[0029] In some embodiments,

[0030] It also includes an outlet pipe, one end of which is connected to the third manifold so as to be able to guide the fluid in the third manifold out;

[0031] One end of the third shunt pipe is inserted into the second pipe section of the second header and communicated with the second header;

[0032] One end of the fourth diverter pipe is inserted into the third header and communicated with the third header.

[0033] In some embodiments,

[0034] The partial pipe section of the third shunt pipe inserted into the second header is welded and connected to the second header, and the partial pipe section of the fourth shunt pipe inserted into the third header is welded and connected to the third header.

[0035] In some embodiments,

[0036] A spacer is also provided in the second manifold. The spacer is an annular structure. The outer periphery of the spacer is connected to the second manifold. The inner periphery of the spacer is a hollow structure and can form an injection hole.

[0037] The utility model also provides an air conditioner, which comprises the aforementioned microchannel heat exchanger.

[0038] The microchannel heat exchanger and air conditioner provided by the utility model have the following beneficial effects:

[0039] 1. The utility model arranges the two ends of the first flat tube to be connected respectively by the first shunt tube plus the first header and the second shunt tube plus the second header. Compared with the existing solution of directly inserting the flat tube into the header, since the width of the flat tube is very wide, the diameter of the header needs to be set larger to meet the insertion of the end of the flat tube into the header. The utility model inserts one end of the flat tube into the shunt tube first, and then connects multiple shunt tubes with the header, which can effectively reduce the diameter of the header, so that it does not need to be designed with a larger diameter to meet the width of the flat tube. Large, thereby being able to effectively reduce the diameter of the collecting pipe, thereby being able to effectively reduce the refrigerant perfusion amount of the microchannel heat exchanger; and the utility model further arranges the first and second shunt pipes alternately along the length direction of the collecting pipe, so that the first shunt pipe is inserted between the two second shunt pipes, and the second shunt pipe is inserted between the two first shunt pipes. Compared with the shunt pipes arranged side by side in the prior art, the size of the shunt pipe in the length direction can be further effectively reduced, so that the two parts of the shunt pipe are more compactly matched and the overall volume is smaller, which can further reduce the refrigerant perfusion amount of the microchannel heat exchanger.

[0040] 2. The utility model further arranges the shunt pipe to be inserted into the collecting pipe. Compared with the prior art method of inserting the collecting pipe into the shunt pipe, the prior art still has some sections of the shunt pipe exposed on the outside. The above-mentioned structure of the utility model effectively overcomes this problem. There is no exposed section of the shunt pipe, so that the length of the shunt pipe can be further reduced, and the refrigerant injection amount can be further reduced; the utility model further arranges the shunt pipe to be inserted into the collecting pipe at one end for welding connection, and the other end is not welded (preferably blocked), and only one end is welded, thereby effectively reducing the welding position and improving the processing efficiency; the utility model also arranges a spacer of an annular structure inside the second collecting pipe, and the inner periphery of the spacer is a hollow structure to form a spray hole, so that the refrigerant can pass through the collecting pipe through the spray hole and further enter the shunt pipe with a reduced inner diameter, and then flow through the liquid separation holes on the wall of the shunt pipe into each microchannel flat tube to complete uniform diversion, thereby improving the uniformity of the refrigerant in each microchannel flat tube and improving the heat exchange performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is the overall structural diagram of the microchannel heat exchanger of the utility model;

[0042] Figure 2 It is a three-dimensional structural diagram of the first header + the first branch pipe + the third header + the fourth branch pipe in the microchannel heat exchanger of the utility model;

[0043] Figure 3 It is a three-dimensional structural diagram of the second header + the second shunt pipe + the third shunt pipe in the microchannel heat exchanger of the utility model;

[0044] Figure 4 It is a three-dimensional structural diagram of the second header in the microchannel heat exchanger of the utility model;

[0045] Figure 5 It is a three-dimensional structural diagram of the first header in the microchannel heat exchanger of the utility model;

[0046] Figure 6 It is a three-dimensional structural diagram of the third header in the microchannel heat exchanger of the utility model;

[0047] Figure 7 It is a three-dimensional structural diagram of the first shunt pipe (or the second shunt pipe, or the third shunt pipe or the fourth shunt pipe) in the microchannel heat exchanger of the utility model;

[0048] Figure 8 It is a three-dimensional structural diagram of a large end cover matched with a header in a microchannel heat exchanger of the utility model;

[0049] Fig. 9It is a three-dimensional structural diagram of a small end cover matched with a flow divider pipe in a microchannel heat exchanger of the utility model;

[0050] Fig.10 It is a three-dimensional structural diagram of a spacer matched with a header in a microchannel heat exchanger of the utility model;

[0051] Fig.11 It is a system structure diagram of the air in the microchannel heat exchanger of the utility model.

[0052] The reference numerals are:

[0053] 1. The first collecting pipe; 2. The first shunt pipe; 3. The first flat tube; 4. The second shunt pipe; 5. The second collecting pipe; 6. The inlet pipe; 7. The third shunt pipe; 8. The second flat tube; 9. The fourth shunt pipe; 10. The third collecting pipe; 11. The outlet pipe; 12. The spacer; 13. The fin; 14. The elbow; 15. The microchannel flat tube connecting hole; 16. The spacer connecting hole; 17. The shunt pipe connecting hole; 18. The inlet pipe connecting hole; 19. The outlet pipe connecting hole; 20. The large end cover; 21. The small end cover; 22. The compressor; 23. The four-way reversing valve; 24. The outdoor heat exchanger; 25. The throttling device; 26. The indoor heat exchanger. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0055] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0056] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0057] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0058] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0059] 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. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0060] like Figure 1-11 As shown, the utility model provides a microchannel heat exchanger, which includes:

[0061] A first header 1, a first shunt tube 2, a first flat tube 3, a second shunt tube 4 and a second header 5, wherein there are a plurality of first shunt tubes 2 and a plurality of first flat tubes 3, the first shunt tubes 2 are connected to the first flat tubes 3 in a one-to-one correspondence, the plurality of first shunt tubes 2 are arranged in sequence at intervals, and the plurality of first shunt tubes 2 are all connected to the first header 1;

[0062] There are multiple second manifolds 4, and the second manifolds 4 are also connected to the first flat tubes 3 one by one. The first flat tubes 3 are connected between the first manifold 2 and the second manifold 4. The multiple second manifolds 4 are arranged in sequence and spaced apart, and the multiple second manifolds 4 are all connected to the second manifold 5, so that the first manifold 1, the first manifold 2, the first flat tubes 3, the second manifold 4 and the second manifold 5 are connected in sequence, so that the fluid can flow through the first manifold 1, the first manifold 2, the first flat tubes 3, the second manifold 4 and the second manifold 5 in sequence;

[0063] Along the length direction of the first collecting tube 1 or the length direction of the second collecting tube 5, the first shunt tubes 2 and the second shunt tubes 4 are alternately arranged, and the first shunt tube 2 is inserted between two adjacent second shunt tubes 4, and the second shunt tube 4 is inserted between two adjacent first shunt tubes 2.

[0064] The utility model arranges the two ends of the first flat tube to be connected respectively by the first shunt tube plus the first header and the second shunt tube plus the second header. Compared with the existing solution of directly inserting the flat tube into the header, since the width of the flat tube is very wide, the diameter of the header needs to be set larger to meet the insertion of the end of the flat tube into the header. The utility model inserts one end of the flat tube into the shunt tube first, and then connects the multiple shunt tubes with the header, which can effectively reduce the diameter of the header, so that it does not need to be designed with a larger diameter to meet the width of the flat tube. , thereby effectively reducing the diameter of the collecting pipe, thereby effectively reducing the refrigerant perfusion amount of the microchannel heat exchanger; and the utility model further arranges the first and second shunt pipes alternately along the length direction of the collecting pipe, so that the first shunt pipe is inserted between the two second shunt pipes, and the second shunt pipe is inserted between the two first shunt pipes. Compared with the shunt pipes arranged side by side in the prior art, the size of the shunt pipe in the length direction can be further effectively reduced, so that the two parts of the shunt pipe are more compactly matched and the overall volume is smaller, which can further reduce the refrigerant perfusion amount of the microchannel heat exchanger.

[0065] In some embodiments,

[0066] The first header 1 has an axial direction parallel to that of the second header 5, and further comprises an inlet pipe 6, one end of which is in communication with the first header 1 so as to allow fluid to flow into the first header 1;

[0067] One end of the first shunt pipe 2 is inserted into the first header 1 and communicated with the first header 1;

[0068] One end of the second flow dividing pipe 4 is inserted into the second flow collecting pipe 5 and communicated with the second flow collecting pipe 5 .

[0069] The utility model further arranges the shunt pipe to be inserted into the collecting pipe. Compared with the prior art method of inserting the collecting pipe into the shunt pipe, the prior art still has part of the shunt pipe section exposed to the outside. The above-mentioned structure of the utility model effectively overcomes this problem. There is no exposed shunt pipe section, so that the length of the shunt pipe can be further reduced, thereby further reducing the refrigerant perfusion amount.

[0070] In some embodiments,

[0071] The first shunt pipe 2 is inserted into the first header 1 and partially connected to the first header 1 by welding, and the second shunt pipe 4 is inserted into the second header 5 and partially connected to the second header 5 by welding. The utility model further arranges the shunt pipe so that one end is inserted into the header for welding connection, and the other end is not welded (preferably blocked), and only one end is welded, thereby effectively reducing the welding position and improving the processing efficiency.

[0072] In some embodiments,

[0073] The first collecting tube 1 and the second collecting tube 5 are arranged opposite to each other in the horizontal direction, one end of the first shunt tube 2 is inserted into the first collecting tube 1, and the other end is blocked and opposite to the second collecting tube 5, and the other end of the first shunt tube 2 is connected to the second collecting tube 5 or arranged at intervals; one end of the second shunt tube 4 is inserted into the second collecting tube 5, and the other end is blocked and opposite to the first collecting tube 1, and the other end of the second shunt tube 4 is connected to the first collecting tube 1 or arranged at intervals; the first shunt tube 2 and the second shunt tube 4 are opposite to each other in the vertical direction.

[0074] This is the first preferred structural form of the two collecting pipes and two rows of diverter pipes of the utility model, which can realize the structure of the two rows of diverter pipes forming an interlaced insertion, and the two rows of diverter pipes are relatively arranged in the vertical direction, which can further make use of the space, make the structure more compact, and make the overall volume smaller, further reducing the refrigerant perfusion amount of the microchannel heat exchanger.

[0075] Figure 2 The inlet pipe 6, the outlet pipe 11, the first header 1, the first branch pipe 2, the third header 10, and the microchannel flat tube connection hole 15. The inlet pipe 6 and the first branch pipe 2 are welded to the first header 1 by brazing; Figure 8 The large end caps 20 shown are welded to both ends of the first manifold 1 by brazing, one at each end (to ensure the sealing of both ends). Figure 5 It can be seen from the first manifold 1 that the shunt pipe connection hole 17 and the inlet pipe connection hole 18 are both circular holes, the cross-sectional normals of the two connection holes are parallel, the inner diameter of the circular hole corresponding to the shunt pipe connection hole 17 is greater than or equal to the outer diameter of the first shunt pipe 2, the inner diameter of the circular hole corresponding to the inlet pipe connection hole 18 is greater than or equal to the outer diameter of the inlet pipe 6, the shunt pipe connection holes 17 are evenly distributed on the first manifold 1, and the inlet pipe connection hole 18 is located in the middle and upper part of the first manifold 1. The outlet pipe 11 and the fourth shunt pipe 9 are both welded to the third manifold 10 by brazing; Fig. 9 The small end caps 21 shown are brazed to the two ends of the third header 10, one at each end. Figure 6 It can be seen from the third manifold 10 that the shunt pipe connection hole 17 and the outlet pipe connection hole 19 are both circular holes, the normal lines of the cross sections of the two connection holes are parallel, the inner diameter of the circular hole corresponding to the shunt pipe connection hole 17 is greater than or equal to the outer diameter of the fourth shunt pipe 9, and the inner diameter of the circular hole corresponding to the outlet pipe connection hole 19 is greater than or equal to the outer diameter of the outlet pipe 11. The shunt pipe connection holes 17 on the third manifold 10 are distributed in the lower section of the third manifold 10, and the spacing between two adjacent connection holes is equal, and the outlet pipe connection hole 19 is located on the third manifold 10 near the bottom.

[0076] In some embodiments,

[0077] The first collecting tube 1 and the second collecting tube 5 are staggered in the horizontal direction, and the first shunt tube 2 and the second shunt tube 4 are also staggered in the horizontal direction, so that the first shunt tube 2 and the second shunt tube 4 are not opposite to each other in the vertical direction, one end of the first shunt tube 2 is inserted into the first collecting tube 1, and the other end is blocked and staggered with the second collecting tube 5; one end of the second shunt tube 4 is inserted into the second collecting tube 5, and the other end is blocked and staggered with the first collecting tube 1.

[0078] This is the second preferred structural form of the two collecting pipes and two rows of diverter pipes of the utility model, which can realize the structure of staggered insertion of the two rows of diverter pipes, and the two rows of diverter pipes are not arranged opposite to each other in the vertical direction, but are staggered in the horizontal direction, so that one row of diverter pipes can be inserted deeper into the other row of diverter pipes, which can further utilize the space, make the structure more compact, and reduce the overall volume, further reducing the refrigerant perfusion amount of the microchannel heat exchanger.

[0079] In some embodiments,

[0080] The first flat tube 3 is a U-shaped structure, which includes two parallel straight sections and a bent section (elbow 14). The bent section is connected between the two straight sections, one end of one straight section is connected to the first shunt pipe 2, and one end of the other straight section is connected to the second shunt pipe 4.

[0081] The first flat tubes 3 are further provided with fins 13 , and the fins 13 are also connected between two adjacent first flat tubes 3 .

[0082] This is the preferred structural form of the first flat tube of the utility model. It can be connected with two rows of diverter pipes respectively through two parallel straight sections, and the elbow realizes the connection and communication between the two straight sections, so that the diverter pipe and the collecting pipe can be arranged on one side of the flat tube, thereby realizing effective use of space, making the structure more compact, further reducing the overall tube length, further reducing the refrigerant injection amount, and enhancing the heat exchange performance between the refrigerant inside the first flat tube and the external air through the fins, thereby increasing the heat exchange amount.

[0083] Figure 7 Schematic diagram of the shunt tube of the utility model (the first, second, third and fourth shunt tubes have the same structure), with a microchannel flat tube connecting hole 15 on the tube wall, the shape and size of the hole are consistent with the outer contour of the microchannel flat tube, and the hole is welded to the microchannel flat tube by brazing. Figure 2 and Figure 3 As shown, one end of the microchannel flat tube connection hole 15 away from the first shunt tube 2 is brazed with the shunt tube connection hole 17, and the other end of the first shunt tube 2 is connected to the shunt tube connection hole 17. Fig. 9 The small end caps 21 are shown being brazed together.

[0084] In some embodiments,

[0085] It also includes a third shunt pipe 7, a second flat pipe 8, a fourth shunt pipe 9 and a third header 10. The second header 5 is divided into a first pipe section and a second pipe section along its length direction. The first pipe section is connected to a plurality of the second shunt pipes 4.

[0086] There are a plurality of third flow dividers 7, and there are a plurality of second flat tubes 8. The third flow dividers 7 are connected to the second flat tubes 8 in a one-to-one correspondence. The plurality of third flow dividers 7 are arranged in sequence at intervals, and the plurality of third flow dividers 7 are all connected to the second tube section of the second header 5.

[0087] There are multiple fourth diverter tubes 9, and the fourth diverter tubes 9 are also connected to the second flat tubes 8 one by one. The second flat tubes 8 are connected between the third diverter tube 7 and the fourth diverter tube 9. The multiple fourth diverter tubes 9 are arranged in sequence at intervals, and the multiple fourth diverter tubes 9 are all connected to the third collecting tube 10, so that the second pipe section of the second collecting tube 5, the third diverter tube 7, the second flat tube 8, the fourth diverter tube 9 and the third collecting tube 10 are connected in sequence.

[0088] This is a further preferred structural form of the utility model, by dividing the second collecting pipe into a first pipe section and a second pipe section along its length direction, the first pipe section is connected with multiple second branch pipes, and the second pipe section is connected with multiple third branch pipes, and through the second flat tube, the fourth branch pipe and the third collecting pipe, the second collecting pipe of the second pipe section can enter the second flat tube through the third branch pipe for heat exchange, and then enter the third collecting pipe through the fourth branch pipe for discharge (if the inlet pipe is the outlet fluid and the outlet pipe is the import fluid at this time, the flow direction is opposite to the flow direction described here), thereby further increasing the flow path and length of the refrigerant fluid, improving the heat exchange performance of the refrigerant, being able to further reduce the refrigerant injection amount, and achieving the required heat exchange performance.

[0089] In some embodiments,

[0090] Along the length direction of the second collecting tube 5 or the length direction of the third collecting tube 10, the third diverter tube 7 and the fourth diverter tube 9 are alternately arranged, and the third diverter tube 7 is inserted between two adjacent fourth diverter tubes 9, and the fourth diverter tube 9 is inserted between two adjacent third diverter tubes 7.

[0091] The utility model further arranges the third and fourth diverter tubes alternately along the length direction of the collecting tube, so that the third diverter tube is inserted between the two fourth diverter tubes, and the fourth diverter tube is inserted between the two third diverter tubes. Compared with the diverter tubes arranged side by side in the prior art, the length direction of the diverter tubes can be further effectively reduced, so that the two parts of the diverter tubes are more compactly matched and the overall volume is smaller, which can further reduce the refrigerant perfusion amount of the microchannel heat exchanger.

[0092] In some embodiments,

[0093] The axial direction of the second manifold 5 is parallel to the axial direction of the third manifold 10, and further comprises an outlet pipe 11, one end of which is connected to the third manifold 10 so as to be able to discharge the fluid in the third manifold 10;

[0094] One end of the third shunt pipe 7 is inserted into the second pipe section of the second header 5 and communicated with the second header 5;

[0095] One end of the fourth diverter pipe 9 is inserted into the third header pipe 10 and communicated with the third header pipe 10 .

[0096] The utility model further arranges the shunt pipe to be inserted into the collecting pipe. Compared with the prior art method of inserting the collecting pipe into the shunt pipe, the prior art still has part of the shunt pipe section exposed to the outside. The above-mentioned structure of the utility model effectively overcomes this problem. There is no exposed shunt pipe section, so that the length of the shunt pipe can be further reduced, thereby further reducing the refrigerant perfusion amount.

[0097] In some embodiments,

[0098] The third shunt pipe 7 is inserted into the second header 5 and partially connected to the second header 5 by welding. The fourth shunt pipe 9 is inserted into the third header 10 and partially connected to the third header 10 by welding.

[0099] The utility model further arranges the shunt pipe so that one end is inserted into the collecting pipe for welding connection, and the other end is not welded (preferably sealed), and only one end is welded, thereby effectively reducing the welding position and improving the processing efficiency.

[0100] In some embodiments,

[0101] A spacer 12 is further provided in the second manifold 5. The spacer 12 is an annular structure. The outer periphery of the spacer 12 is connected to the second manifold 5. The inner periphery of the spacer 12 is a hollow structure and can form an injection hole.

[0102] The utility model also arranges a ring-shaped spacer inside the second collecting pipe, and the inner periphery of the spacer is a hollow structure to form a spray hole, so that the refrigerant can pass through the collecting pipe through the spray hole and further enter the diversion pipe with a reduced inner diameter, and then flow through the liquid separation holes on the wall of the diversion pipe to enter each microchannel flat tube to complete uniform diversion, thereby improving the uniformity of the refrigerant in each microchannel flat tube and improving the heat exchange performance.

[0103] Figure 3The second flow divider 4, the second flow collecting tube 5, the microchannel flat tube connection hole 15, and the spacer 12 are all welded to the second flow collecting tube 5 by brazing. Figure 8 The large end caps 20 shown are welded to both ends of the second header 5 by brazing, one at each end. Fig.10 The spacer 12 shown is also welded by brazing. Figure 4 At the position of the spacer connecting hole 16 shown, the spacer 12 is an annular structure, and the inner ring diameter is smaller than the inner diameter of the second manifold 5, which plays the role of injecting refrigerant when the heat exchanger is used as an evaporator. Figure 4 It can be seen from the second collecting pipe 5 that the shunt pipe connecting hole 17 is a circular hole, and the inner diameter of the circular hole corresponding to the shunt pipe connecting hole 17 is greater than or equal to the outer diameter of the second shunt pipe 4. Taking the spacer 12 as the dividing line, the shunt pipe connecting holes 17 on the upper and lower sides of the spacer 12 are evenly distributed on the second collecting pipe 5.

[0104] The utility model designs a microchannel heat exchanger structure with simplified flow path. Compared with the existing microchannel heat exchanger, the inner diameter of each manifold in the utility model is reduced, which will significantly reduce the filling amount of refrigerant and material cost, and improve economic efficiency. The refrigerant enters the manifold with reduced inner diameter through the injection hole, and then flows through the liquid separation hole (microchannel connection hole) on the wall of the diversion tube to enter each diversion tube to complete uniform diversion, thereby improving the uniformity of the refrigerant in each microchannel flat tube.

[0105] The utility model also provides an air conditioner, which comprises the aforementioned microchannel heat exchanger.

[0106] In view of the problem of large refrigerant filling volume in traditional manifolds and uneven refrigerant distribution among microchannel flat tubes during refrigerant diversion in the manifold, the utility model solves the above problems by adopting a new diversion structure that cooperates a small-diameter manifold with a diversion tube structure.

[0107] In the utility model, the refrigerant flow path in the heat exchanger is simplified by connecting the two ends of the flat tube to the collecting pipe through circular diverter pipes, effectively reducing the diameter of the collecting pipe, so that the inner diameter of each tube of the two-way collecting pipe structure is smaller than that of the previous collecting pipe, thereby significantly reducing the refrigerant filling amount and material cost, and improving economy.

[0108] The utility model arranges an annular partition inside the collecting pipe so that the refrigerant enters the collecting pipe with a reduced inner diameter through the injection hole on the partition, and then flows through the flat tube connecting holes on the branch pipe wall to enter each flat tube to complete uniform branching, thereby improving the uniformity of the refrigerant in each microchannel flat tube and improving the heat exchange performance.

[0109] The utility model provides a refrigerant flow splitting structure with reduced filling volume and uniform flow splitting and a corresponding heat exchanger structure. Figure 1This is a schematic diagram of the structure, which mainly includes a refrigerant vapor inlet pipe (inlet pipe 6), a refrigerant liquid outlet pipe (outlet pipe 11); a first collecting pipe 1; a first branch pipe 2 and a second branch pipe 4; a second collecting pipe 5; a third collecting pipe 10; an elbow 14 (bending section) of a microchannel flat tube; a microchannel flat tube (including a first flat tube 3 and a second flat tube 8); and a fin 13.

[0110] When the heat exchanger of the utility model is used as a condenser, the high-temperature and high-pressure refrigerant vapor coming out of the compressor exhaust port flows into the first header 1 from the inlet pipe 6, and is divided through the first branch pipe 2 of the first header 1 under the action of pressure. The refrigerant vapor enters multiple first flat tubes 3. At this time, the refrigerant vapor in the first flat tubes 3 has begun to exchange heat with the outside and condense, and then flows through the elbow 14 of the microchannel flat tube to enter the first flat tube 3 of the next path. The single-path microchannel flow path of the entire heat exchanger is in a "U" shape. The refrigerant that has completed condensation in each flow path passes through the end of the first flat tube 3 and enters the third branch pipe 7 of the second header 5, and then enters the third header 10 to complete convergence. The refrigerant liquid in the upper section of the second collecting pipe 5 enters the lower section of the second collecting pipe 5 through the spacer 12, and further enters the supercooling section of the heat exchanger through the third branch pipe 7 for heat exchange and supercooling. The microchannel flow path of the supercooling section is also a single "U"-shaped flow path. After the refrigerant is supercooled in the second flat tube 8, it flows into the third collecting pipe 10 through the fourth branch pipe 9, and finally enters the next process through the outlet pipe 11 below the third collecting pipe 10.

[0111] When the heat exchanger of the utility model is used as an evaporator, the flow direction of the entire refrigerant is opposite to that when the heat exchanger is used as a condenser. The gas-liquid two-phase flow of the refrigerant enters the third header 10 from the outlet pipe 11, enters the second flat tube 8 through the fourth diverter pipe 9 to complete partial evaporation, and then enters the lower section of the second header 5 through the third diverter pipe 7. The refrigerant is then sprayed into the upper section of the second header 5 through the partition 12 and diverted through the second diverter pipe 4. The refrigerant is diverted to each first flat tube 3 to exchange heat with the outside to complete evaporation. The gaseous refrigerant is then gathered to the first header 1 through the first diverter pipe 2, and finally flows out of the microchannel heat exchanger through the inlet pipe 6 to enter the next process.

[0112] The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the utility model should be included in the protection scope of the utility model. The above is only a preferred implementation of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the utility model, and these improvements and variations should also be regarded as the protection scope of the utility model.

Claims

1. A microchannel heat exchanger, characterized in that: include: A first collecting pipe (1), a first shunt pipe (2), a first flat tube (3), a second shunt pipe (4) and a second collecting pipe (5), wherein there are a plurality of first shunt pipes (2), there are a plurality of first flat tubes (3), the first shunt pipes (2) are connected to the first flat tubes (3) in a one-to-one correspondence, the plurality of first shunt pipes (2) are arranged in sequence at intervals, and the plurality of first shunt pipes (2) are all connected to the first collecting pipe (1); There are a plurality of second flow dividers (4), and the second flow dividers (4) are also connected to the first flat tubes (3) in a one-to-one correspondence. The first flat tubes (3) are connected between the first flow dividers (2) and the second flow dividers (4). The plurality of second flow dividers (4) are arranged in sequence and spaced apart, and the plurality of second flow dividers (4) are all connected to the second header (5), so that the first header (1), the first flow dividers (2), the first flat tubes (3), the second flow dividers (4) and the second header (5) are connected in sequence. Along the length direction of the first collecting tube (1) or the length direction of the second collecting tube (5), the first shunt tube (2) and the second shunt tube (4) are alternately arranged, and the first shunt tube (2) is inserted between two adjacent second shunt tubes (4), and the second shunt tube (4) is inserted between two adjacent first shunt tubes (2).

2. The microchannel heat exchanger according to claim 1, characterized in that: It also comprises an inlet pipe (6), one end of which is in communication with the first header (1) so as to allow fluid to flow into the first header (1); One end of the first flow dividing pipe (2) is inserted into the first flow collecting pipe (1) and communicated with the first flow collecting pipe (1); One end of the second flow dividing pipe (4) is inserted into the second flow collecting pipe (5) and communicated with the second flow collecting pipe (5).

3. The microchannel heat exchanger according to claim 2, characterized in that: The partial pipe section of the first shunt pipe (2) inserted into the first collecting pipe (1) is welded to the first collecting pipe (1), and the partial pipe section of the second shunt pipe (4) inserted into the second collecting pipe (5) is welded to the second collecting pipe (5).

4. The microchannel heat exchanger according to claim 1, characterized in that: The first collecting pipe (1) and the second collecting pipe (5) are arranged opposite to each other in the horizontal direction; one end of the first shunt pipe (2) is inserted into the first collecting pipe (1), and the other end is blocked and opposite to the second collecting pipe (5); the other end of the first shunt pipe (2) is connected to or spaced from the second collecting pipe (5); one end of the second shunt pipe (4) is inserted into the second collecting pipe (5), and the other end is blocked and opposite to the first collecting pipe (1); the other end of the second shunt pipe (4) is connected to or spaced from the first collecting pipe (1); the first shunt pipe (2) and the second shunt pipe (4) are opposite to each other in the vertical direction.

5. The microchannel heat exchanger according to claim 1, characterized in that: The first collecting tube (1) and the second collecting tube (5) are staggered in the horizontal direction, and the first shunt tube (2) and the second shunt tube (4) are also staggered in the horizontal direction, so that the first shunt tube (2) and the second shunt tube (4) are not opposite to each other in the vertical direction, one end of the first shunt tube (2) is inserted into the first collecting tube (1), the other end is blocked and staggered with the second collecting tube (5); one end of the second shunt tube (4) is inserted into the second collecting tube (5), the other end is blocked and staggered with the first collecting tube (1).

6. The microchannel heat exchanger according to claim 1, characterized in that: The first flat tube (3) is a U-shaped structure, comprising two parallel straight sections and a bent section, wherein the bent section is connected between the two straight sections, one end of one of the straight sections is connected to the first flow dividing tube (2), and one end of the other straight section is connected to the second flow dividing tube (4). The first flat tubes (3) are also provided with fins (13), and the fins (13) are also connected between two adjacent first flat tubes (3).

7. The microchannel heat exchanger according to claim 1, characterized in that: It also comprises a third flow dividing pipe (7), a second flat pipe (8), a fourth flow dividing pipe (9) and a third flow collecting pipe (10), wherein the second flow collecting pipe (5) is divided into a first pipe section and a second pipe section along its length direction, and the first pipe section is connected to a plurality of the second flow dividing pipes (4); There are a plurality of the third flow diverter tubes (7), and there are also a plurality of the second flat tubes (8). The third flow diverter tubes (7) are connected to the second flat tubes (8) in a one-to-one correspondence. The plurality of third flow diverter tubes (7) are arranged in sequence at intervals, and the plurality of third flow diverter tubes (7) are all connected to the second tube section of the second collecting tube (5); There are a plurality of fourth shunt tubes (9), and the fourth shunt tubes (9) are also connected to the second flat tubes (8) in a one-to-one correspondence. The second flat tubes (8) are connected between the third shunt tube (7) and the fourth shunt tube (9). The plurality of fourth shunt tubes (9) are arranged in sequence at intervals, and the plurality of fourth shunt tubes (9) are all connected to the third header (10), so that the second tube section of the second header (5), the third shunt tube (7), the second flat tube (8), the fourth shunt tube (9) and the third header (10) are connected in sequence.

8. The microchannel heat exchanger according to claim 7, characterized in that: Along the length direction of the second manifold (5) or the length direction of the third manifold (10), the third shunt tube (7) and the fourth shunt tube (9) are alternately arranged, and the third shunt tube (7) is inserted between two adjacent fourth shunt tubes (9), and the fourth shunt tube (9) is inserted between two adjacent third shunt tubes (7).

9. The microchannel heat exchanger according to claim 7, characterized in that: It also includes an outlet pipe (11), one end of which is in communication with the third manifold (10) so as to be able to discharge the fluid in the third manifold (10); One end of the third flow dividing pipe (7) is inserted into the second pipe section of the second flow collecting pipe (5) and communicates with the second flow collecting pipe (5); One end of the fourth flow dividing pipe (9) is inserted into the third flow collecting pipe (10) and communicated with the third flow collecting pipe (10).

10. The microchannel heat exchanger according to claim 9, characterized in that: The partial pipe section of the third shunt pipe (7) inserted into the second header (5) is welded to the second header (5), and the partial pipe section of the fourth shunt pipe (9) inserted into the third header (10) is welded to the third header (10).

11. The microchannel heat exchanger according to claim 7, characterized in that: A spacer (12) is also provided in the second collecting pipe (5). The spacer (12) is an annular structure. The outer periphery of the spacer (12) is connected to the second collecting pipe (5). The inner periphery of the spacer (12) is a hollow structure capable of forming an injection hole.

12. An air conditioner, characterized in that: A microchannel heat exchanger comprising any one of claims 1-11.

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