A copper tube aluminum fin heat exchanger and a manufacturing method thereof, and a heat pump air conditioner

Abstract

The application discloses a copper tube aluminum fin heat exchanger, which comprises fins and at least one group of heat exchange pipes, wherein each group of heat exchange pipes comprises a plurality of long U tubes, a gas collecting pipe, a liquid collecting pipe and a capillary tube. The plurality of long U tubes are arranged in parallel and are connected to form a pipeline, and are connected to the fins in the form of expanded tubes. The gas collecting pipe is connected to the first end of the pipeline, and when used as a condenser, the gas collecting pipe inputs gaseous condensing agent into the pipeline, and when used as an evaporator, the gas collecting pipe discharges gaseous condensing agent from the pipeline. The liquid collecting pipe is connected to the second end of the pipeline, and when used as a condenser, the liquid collecting pipe leads out liquid refrigerant in the pipeline. The capillary tube is connected to the second end of the pipeline, and when used as an evaporator, the capillary tube sends liquid refrigerant into the pipeline.

Description

Technical Field

[0001] This invention relates to the field of thermal management technology, and in particular to a copper tube aluminum fin heat exchanger and its manufacturing method, as well as a heat pump air conditioner. Background Technology

[0002] Air conditioning equipment is a device that can remove or introduce heat from a room, and is widely used in homes, offices, shopping malls, and other places. The heat exchanger is one of the core components of air conditioning equipment; its main function is to transfer heat through heat exchange. The copper tube aluminum fin heat exchanger is a common type of heat exchanger, mainly composed of copper tubes and aluminum fins. Refrigerant flows inside the copper tubes, and the aluminum fins achieve heat exchange through contact with the air.

[0003] Existing heat pump air conditioning systems typically use copper tube aluminum fin heat exchangers with a single-entry, single-exit manifold structure. This means the refrigerant enters through the manifold, passes through a set of parallel heat exchange tubes, and exits back into the manifold. While this structure is simple and easy to manufacture and install, it can lead to uneven refrigerant distribution within the heat exchanger under certain conditions, affecting its performance. Specifically, when switching between cooling and heating modes, the refrigerant may not distribute evenly after being split within the heat exchanger, resulting in some heat exchange tubes having too much or too little refrigerant, thus impacting efficiency. Furthermore, because the overall structure uses a single-entry, single-exit manifold, the heat exchanger's performance may be limited after switching between cooling and heating modes, preventing it from fully utilizing its capabilities. Summary of the Invention

[0004] To address some or all of the problems of existing technologies, and in order to achieve uniform liquid distribution and fully utilize the heat exchanger's function, the first aspect of this invention provides a copper tube aluminum fin heat exchanger, comprising: fins and at least one set of heat exchange pipes, wherein each set of heat exchange pipes includes: A plurality of long U-tubes, wherein the plurality of long U-tubes are arranged in parallel and connected to form a pipeline, and the long U-tubes are connected to the fins by means of tube expansion; A gas collecting pipe is connected to the first end of the pipeline. When the copper tube aluminum fin heat exchanger is used as a condenser, the gas collecting pipe is used to input gaseous refrigerant into the pipeline. When the copper tube aluminum fin heat exchanger is used as an evaporator, the gas collecting pipe is used to discharge gaseous refrigerant from the pipeline. A liquid collection pipe is connected to the second end of the pipeline. When the copper tube aluminum fin heat exchanger is used as a condenser, the liquid collection pipe is used to discharge the liquid refrigerant in the pipeline. A capillary tube, connected to the second end of the pipeline, is used to deliver liquid refrigerant into the pipeline when the copper tube aluminum fin heat exchanger is used as an evaporator.

[0005] Furthermore, the several long U-shaped pipes are connected into a single pipeline via U-shaped elbows.

[0006] Furthermore, the U-shaped elbow is connected to the long U-tube by brazing.

[0007] Furthermore, the gas collecting pipe is connected to the first end of the pipeline by brazing.

[0008] Furthermore, the heat exchange pipeline also includes a tee, the first end of which is connected to the second end of the pipeline, the second end of which is connected to the liquid collection pipe, and the third end of which is connected to the capillary tube.

[0009] Furthermore, the tee is connected to the second end of the pipeline, the liquid collection pipe, and the capillary tube by brazing.

[0010] Furthermore, a plastic sealing layer is provided on the outside of the capillary.

[0011] Furthermore, a first check valve is provided on the liquid collection pipe, and the first check valve faces outward.

[0012] Furthermore, the capillary tube is connected to a second one-way valve, which faces inward.

[0013] Furthermore, when there is more than one set of heat exchange pipes, the capillary tubes of each set of heat exchange pipes are connected to the second one-way valve through a liquid separator.

[0014] Furthermore, the copper tube aluminum fin heat exchanger also includes a protective plate that covers the fins and heat exchange pipes, but exposes at least a portion of the fins.

[0015] Furthermore, the fins are made of aluminum, copper, platinum, or their alloys, and a protective layer is provided on the surface of the fins, which is formed by electrophoresis, epoxy resin coating, or nano-coating.

[0016] Furthermore, the fin thickness is 0.112 to 0.15 mm, and the fin spacing is 1.8 to 2.5 mm.

[0017] A second aspect of the present invention provides a method for manufacturing a copper tube aluminum fin heat exchanger as described above, comprising: The arrangement of the long U-tubes and the brazing positions are determined based on the heat exchange requirements. Arrange long U-tubes according to the layout scheme, and connect multiple long U-tubes into a pipeline by U-shaped elbows according to the layout scheme and brazing positions. Connect the first end of each pipe to the gas collection pipe via the first branch pipe, and connect the second end to a tee. The second end of each tee is connected to the liquid collection tube via the second branch pipe, and the third end is connected to the capillary tube one by one. A first check valve is connected to the outlet of the collection tube, and each capillary tube is connected to a second check valve through a distributor.

[0018] Based on the copper tube aluminum fin heat exchanger as described above, a third aspect of the present invention provides a heat pump air conditioner, which includes the copper tube aluminum fin heat exchanger as described above.

[0019] This invention provides a copper tube aluminum fin heat exchanger with a two-inlet, one-outlet structure, which effectively achieves uniform refrigerant distribution within the heat exchanger. Regardless of cooling or heating mode, it ensures uniform refrigerant distribution in each heat exchange tube, avoiding issues of excessive or insufficient refrigerant in some tubes, thereby improving heat exchanger efficiency. Compared to the existing one-inlet, one-outlet structure, it better adapts to switching between cooling and heating modes. In both cooling and heating modes, the heat exchanger functions at its maximum capacity, improving the overall performance of the air conditioning system. Furthermore, the copper tube aluminum fin heat exchanger has a simple overall manufacturing process, enabling simpler and more reliable assembly and maintenance. Simultaneously, because the copper tube aluminum fin heat exchanger can uniformly distribute refrigerant and improve efficiency, it can reduce energy waste and lower operating costs during long-term use. The copper tube aluminum fin heat exchanger is suitable for various types of air conditioning systems, whether commercial or residential, and can maintain stable performance under different operating conditions. Attached Figure Description

[0020] To further illustrate the above and other advantages and features of the various embodiments of the present invention, a more specific description of the various embodiments of the present invention will be presented with reference to the accompanying drawings. It is to be understood that these drawings depict only typical embodiments of the invention and are therefore not intended to limit its scope. In the drawings, identical or corresponding parts will be indicated by identical or similar reference numerals for clarity.

[0021] Figure 1 A schematic diagram of a copper tube aluminum finned heat exchanger according to an embodiment of the present invention is shown. Figure 2 This shows a left-side view of a copper tube aluminum finned heat exchanger according to an embodiment of the present invention; Figure 3 This shows a right-side view of a copper tube aluminum finned heat exchanger according to an embodiment of the present invention; Figure 4 This is a partially enlarged schematic diagram of region A on the left side of a copper tube aluminum finned heat exchanger according to an embodiment of the present invention. Figure 5 This diagram illustrates the structure of a long U-tube according to an embodiment of the present invention. Figure 6This diagram illustrates the structure of a U-shaped elbow according to an embodiment of the present invention. Figure 7 A schematic diagram of the structure of a trouser tee according to an embodiment of the present invention is shown.

[0022] List of reference numerals 101 Fins; 121 Long U-tube, 122 Gas collecting tube, 123 Liquid collecting tube, 124 Capillary tube, 125 U-shaped elbow, 126 T-joint, 127 First check valve, 128 Second check valve, 129 Liquid separator; 1221 Main gas collecting pipe, 1222 Inlet gas collecting pipe, 1223 Branch gas collecting pipe; 1231 Main collecting pipe, 1232 Inlet collecting pipe, 1233 Branch collecting pipe 131 Left guard plate, 132 Right guard plate, 133 Top plate, 134 Bottom plate; 401 First terminal, 402 Second terminal; 501 Bent head, 502 Long straight section; 701 Main port, 702 First tributary port, 703 Second tributary port. Detailed Implementation

[0023] In the following description, the invention is described with reference to various embodiments. However, those skilled in the art will recognize that the embodiments may be practiced without one or more specific details or with other alternatives and / or additional methods, materials, or components. In other instances, well-known structures, materials, or operations are not shown or described in detail so as not to obscure the inventive points of the invention. Similarly, for illustrative purposes, specific quantities, materials, and configurations are set forth to provide a comprehensive understanding of embodiments of the invention. However, the invention is not limited to these specific details. Furthermore, it should be understood that the embodiments shown in the drawings are illustrative representations and are not necessarily drawn to scale.

[0024] In this specification, references to "an embodiment" or "this embodiment" mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in at least one embodiment of the invention. The phrase "in one embodiment" appearing throughout this specification does not necessarily refer to the same embodiment in all instances.

[0025] It should be noted that the embodiments of the present invention describe the process steps in a specific order; however, this is only for illustrating the specific embodiment and not for limiting the order of the steps. On the contrary, in different embodiments of the present invention, the order of the steps can be adjusted according to the process.

[0026] Existing copper tube aluminum finned heat exchangers, when switching between cooling and heating modes, may experience uneven refrigerant distribution after the refrigerant is split within the heat exchanger, resulting in some heat exchange tubes having too much or too little refrigerant, thus affecting the heat exchanger's efficiency. Furthermore, due to the overall structure of the heat exchanger using a single inlet and single outlet manifold, its performance may be limited after switching between cooling and heating modes, preventing it from fully utilizing its capabilities. To address this issue, this invention provides a copper tube aluminum finned heat exchanger with a dual inlet and single outlet structure. It incorporates the unidirectional conduction characteristic of a one-way valve and the system's inherent high-pressure to low-pressure refrigerant flow characteristic, ensuring uniform refrigerant distribution after splitting within the heat exchanger in both cooling and heating modes, thereby improving the heat exchanger's efficiency.

[0027] The technical solution of the present invention will be further described below with reference to the accompanying drawings of the embodiments.

[0028] Figure 1 This diagram illustrates the structure of a copper tube aluminum finned heat exchanger according to an embodiment of the present invention. Figure 1 As shown, a copper tube aluminum fin heat exchanger includes fins 101 and at least one set of heat exchange pipes, wherein the fins 101 are attached to the side of the heat exchange pipes, and each set of heat exchange pipes includes several long U-tubes 121, gas collecting pipes 122, liquid collecting pipes 123, and capillary tubes 124.

[0029] In one embodiment of the present invention, the fin 101 is made of aluminum, copper, platinum, or an alloy thereof. The thickness of the fin 101 is 0.112 to 0.15 mm, and the fin spacing is 1.8 to 2.5 mm. In one embodiment of the present invention, a protective layer is provided on the surface of the fin, the protective layer being formed, for example, by electrophoresis, epoxy resin spraying, or nano-spraying.

[0030] Figure 5 A schematic diagram of the structure of a long U-tube according to an embodiment of the present invention is shown. Figure 5 As shown, the long U-tube includes a bent head 501 and a parallel long straight portion 502. In one embodiment of the present invention, the long U-tubes 121 are arranged in parallel. Preferably, the directions of each long U-tube 121 are consistent, that is, the bent head of each long U-tube 121 is located on the first side of the copper tube aluminum fin heat exchanger, such as... Figure 3 As shown, on the second side of the copper tube aluminum finned heat exchanger opposite to its first side, the ports of each long U-tube 121 are connected by means such as a U-bend 125, so that each long U-tube 121 in each group of heat exchange pipes is connected to form a pipeline, the pipeline including two ports, such as... Figure 4 As shown. In one embodiment of the invention, as Figure 1As shown, the fin 101 is attached to the side of the long U-tube 121, and the long U-tube 121 is connected to the fin 101 by means of an expansion tube.

[0031] Figure 6 A schematic diagram of the structure of a U-shaped elbow according to an embodiment of the present invention is shown, as follows: Figure 6 As shown, the port shape and outer diameter of the U-shaped elbow 125 match those of the long U-tube 121. In one embodiment of the invention, the U-shaped elbow 125 is connected to the port of the long U-tube by brazing. Different arrangements and brazing positions of the U-shaped elbow and the long U-tube can determine different tube passes, flow directions, and tube resistances of the heat exchanger. In one embodiment of the invention, the outer diameter of the long U-tube is determined according to the heat exchange requirements, for example, it can be 4 mm, 5 mm, 7 mm, 9.52 mm, or 12.7 mm.

[0032] like Figure 1 As shown, the gas collecting pipe 122 is connected to the first end 401 of the pipeline formed by the long U-tube, and is used for inputting or discharging gaseous refrigerant. Its specific function is determined according to the operating mode of the copper tube aluminum fin heat exchanger. In one embodiment of the invention, in the cooling or heating mode of the heat pump system, if the copper tube aluminum fin heat exchanger acts as a condenser, then the first end 401 of the pipeline acts as an inlet, and the gas collecting pipe 122 is used to input gaseous refrigerant into the pipeline; if the copper tube aluminum fin heat exchanger acts as an evaporator, then the first end 401 of the pipeline acts as an outlet, and the gas collecting pipe 122 is used to discharge the gaseous refrigerant in the pipeline to external devices or equipment such as a compressor. Figure 1 As shown, the gas collecting pipe 122 includes a main gas collecting pipe 1221, a gas collecting pipe inlet pipe 1222, and a plurality of gas collecting pipe branch pipes 1223. Each gas collecting pipe branch pipe 1223 is connected to a heat exchange pipe in a corresponding manner. Specifically, the first end of each gas collecting pipe branch pipe 1223 is connected to the first end of a heat exchange pipe, and the second end is connected to the main pipe 1221. Finally, it connects to other devices or equipment through the gas collecting pipe inlet pipe 1222. In one embodiment of the present invention, the gas collecting pipe branch pipe 1223 is connected to the first end of the pipe by brazing.

[0033] like Figure 1 As shown, the second end of the pipeline is connected to a tee 126. Figure 7 A schematic diagram of the structure of a trouser tee according to an embodiment of the present invention is shown, as follows: Figure 7 As shown, the tee includes a main port 701, a first branch port 702, and a second branch port 703. (Back) Figure 1The main port of the U-shaped tee is connected to the second end of the pipeline, and its first branch port and second branch port are respectively connected to the liquid collecting pipe 123 and the capillary tube 124. In one embodiment of the present invention, the U-shaped tee is connected to the second end of the pipeline by brazing. In one embodiment of the present invention, the U-shaped tee is made of copper, and its specifications are compatible with the long U-tube 121.

[0034] like Figure 1 As shown, the liquid collecting pipe 123 is connected to the first branch port of the tee 126 for discharging liquid refrigerant. Figure 1 As shown, the liquid collecting pipe 123 includes a main liquid collecting pipe 1231, a liquid collecting pipe inlet pipe 1232, and a plurality of liquid collecting pipe branch pipes 1233. Each liquid collecting pipe branch pipe 1233 is connected to a heat exchange pipe in a corresponding manner. Specifically, the first end of each liquid collecting pipe branch pipe 1233 is connected to the first branch port of a tee connected to a heat exchange pipe, and the second end is connected to the main liquid collecting pipe 1231. Finally, it connects to other devices or equipment through the liquid collecting pipe inlet pipe 1232. A first one-way valve 127 is provided at the end of the liquid collecting pipe inlet pipe 1232, and the first one-way valve faces outwards. In one embodiment of the present invention, the liquid collecting pipe branch pipe 1223 is connected to the tee by brazing. The first one-way valve 127 is connected to the liquid collecting pipe inlet pipe 1232 by brazing. In one embodiment of the present invention, in the cooling or heating mode of the heat pump system, if the copper tube aluminum fin heat exchanger is used as a condenser, the second end of the pipeline is used as a liquid outlet, and the liquid collection pipe 123 is used to discharge the liquid refrigerant in the pipeline to external devices or equipment such as a throttling device. If the copper tube aluminum fin heat exchanger is used as an evaporator, the first end of the pipeline is used as a liquid inlet. At this time, due to the high and low pressure inside the copper tube aluminum fin heat exchanger and the setting of the first one-way valve, the liquid collection pipe 123 is not circulated.

[0035] like Figure 1 As shown, the capillary tube 124 is connected to the second branch port of the tee 126 for introducing liquid refrigerant into the pipeline. Figure 1As shown, the copper tube aluminum fin heat exchanger includes several capillary tubes 124, each connected to a heat exchange pipe in a one-to-one correspondence. Specifically, each capillary tube 124 is connected to the second branch port of a tee fitting on a heat exchange pipe. The second end is concentrated at one point via a distributor head 129, thus connecting to other devices or equipment. A second one-way valve 128 is provided at the inlet of the distributor head 129, with the second one-way valve facing inward. In one embodiment of the invention, the capillary tubes 124 are externally covered with a plastic sealing layer and connected to the tee fitting by brazing. The second one-way valve is connected to the distributor head 129 by brazing. In one embodiment of the present invention, in the cooling or heating mode of the heat pump system, if the copper tube aluminum fin heat exchanger is used as a cooler, the second end of the pipeline is used as a liquid outlet. At this time, due to the high and low pressure inside the copper tube aluminum fin heat exchanger and the setting of the second one-way valve, the capillary tube 124 is not flowing. If the copper tube aluminum fin heat exchanger is used as an evaporator, the first end of the pipeline is used as a liquid inlet, and the capillary tube 123 inputs liquid refrigerant into the pipeline.

[0036] like Figure 1 As shown, the copper tube aluminum finned heat exchanger also includes a protective plate that covers the fins and heat exchange pipes, but exposes at least a portion of the fins. Figure 1 As shown, the protective plate includes a left protective plate 131, a right protective plate 132, a top plate 133, and a bottom plate 134. The left protective plate 131, right protective plate 132, top plate 133, and bottom plate 134 are connected and fixed to each other by fasteners to protect the fins 101 and the heat exchange pipes. In one embodiment of the present invention, the protective plate is made of galvanized steel plate, or galvanized steel plate with spray coating, or stainless steel plate, etc.

[0037] As described above, the copper tube aluminum fin heat exchanger adopts a two-inlet, one-outlet structure, including a gas collecting pipe, a liquid collecting pipe with a first one-way valve, and a distributor (including a distributor head and capillary tube) with a second one-way valve. This effectively achieves uniform refrigerant distribution within the heat exchanger. Regardless of whether it's cooling or heating mode, it ensures uniform refrigerant distribution within each heat exchange tube, avoiding issues of excessive or insufficient refrigerant in some tubes, thereby improving heat exchanger efficiency. Due to its two-inlet, one-outlet structure, compared to the existing one-inlet, one-outlet structure, it better adapts to switching between cooling and heating modes. In both cooling and heating modes, the heat exchanger can perform at its maximum capacity, improving the overall performance of the air conditioning system. Although the structure of the copper tube aluminum fin heat exchanger is more complex than existing technologies, through optimized design and manufacturing processes, simpler and more reliable assembly and maintenance can be achieved. Furthermore, because it can uniformly distribute refrigerant and improve efficiency, it can reduce energy waste and lower operating costs during long-term use. The copper tube aluminum fin heat exchanger enables uniform distribution of refrigerant within each heat exchange tube, improving the heat exchanger's efficiency. It ensures efficient operation in both cooling and heating modes, enhancing the overall performance of the air conditioning system. It is suitable for various types of air conditioning systems, whether commercial or residential, and performs effectively.

[0038] The present invention further provides a method for manufacturing a copper tube aluminum fin heat exchanger as described above, comprising: First, prepare the raw materials, including copper pipes, U-shaped elbows, aluminum fins, manifolds, distributors, tee fittings, check valves, galvanized steel sheets, and fasteners. The distributor is composed of a distributor head and a capillary tube welded together. Simultaneously, determine the arrangement of the long U-shaped pipes and the brazing locations based on the heat exchange requirements. Next, the copper tube is processed into a long U-tube, the size of which is determined according to the heat exchange requirements, for example, its U-shaped part has a diameter of 25 mm, an outer diameter of 10 mm, and an effective length of 1000 mm. Next, the aluminum fins are machined to a specified size using a mold, for example, 800 mm × 100 mm, and then corrugated. Equilateral triangular perforations are then created, with a diameter of 9.52 mm and a spacing of 25 mm × 21.65 mm. The number of aluminum fins is determined based on the heat exchange requirements, for example, 500 fins. Next, the galvanized steel sheet is made into corresponding side plates according to the design requirements, and holes corresponding to the fins are opened on the left and right side plates. Next, the long U-tube is arranged according to the pre-designed layout, passed through the holes in the left and right side plates and aluminum fins, and mechanically expanded to an outer diameter of 10 mm. After the tube is expanded, the end of the long U-tube is flared to a depth of 13 mm. Next, the top and bottom sheet metal panels are secured together with rivets; Next, according to the determined plan, the U-shaped elbow is brazed to the flared end of the long U-tube, with an insertion depth of 7 mm; Next, the tee is brazed to the end of the long U-tube according to the design, with the flared end inserted to a depth of 7 mm. The tee is preferably welded with the outlet vertically overlapping. Next, the gas collection pipe is brazed to the end of the long U-tube according to the design, with the flared end inserted to a depth of 7 mm. The size of the gas collection pipe is determined according to the heat dissipation requirements and must match the long U-tube. For example, its main pipe outer diameter is 22.22 mm, the branch pipe outer diameter is 9.52 mm, and the inlet pipe outer diameter is 19.05 mm. Next, the collecting pipe and the distributor are brazed to the two outlets of the tee, with an insertion depth of 7 mm. The size of the collecting pipe is determined according to the heat dissipation requirements and must match the tee. For example, the outer diameter of the main collecting pipe is 19.05 mm, the outer diameter of the branch pipe is 9.52 mm, and the outer diameter of the inlet pipe is 15.88 mm. Next, the first one-way valve is brazed to the outlet of the liquid collection pipe, with the flow direction facing outwards.

[0039] Finally, the second one-way valve is brazed to the distributor via a connecting pipe, with the flow direction facing inward.

[0040] This allows for the manufacture of a high-efficiency copper-tube, aluminum-fin heat exchanger for heat pump air conditioners. It solves the problem of uneven refrigerant distribution after the refrigerant splits within the heat exchanger, thus improving efficiency. Furthermore, the overall structure of the heat exchanger, with its two-inlet and one-outlet configuration, ensures optimal performance in both cooling and heating modes.

[0041] The present invention also provides a heat pump air conditioner, which includes the copper tube aluminum fin heat exchanger as described above.

[0042] Although various embodiments of the invention have been described above, it should be understood that they are presented by way of example only and not as limitations. It will be apparent to those skilled in the art that various combinations, modifications, and alterations can be made without departing from the spirit and scope of the invention. Therefore, the breadth and scope of the invention disclosed herein should not be limited by the exemplary embodiments disclosed above, but should be defined solely by the appended claims and their equivalents.

Claims

1. A copper tube aluminum fin heat exchanger, characterized in that, include: Fins and at least one set of heat exchange pipes, wherein each set of heat exchange pipes includes: A plurality of long U-tubes, wherein the plurality of long U-tubes are arranged in parallel and connected to form a pipeline, and the long U-tubes are connected to the fins by means of tube expansion; A gas collecting pipe is connected to the first end of the pipeline. When the copper tube aluminum fin heat exchanger is used as a condenser, the gas collecting pipe is configured to input gaseous refrigerant into the pipeline. When the copper tube aluminum fin heat exchanger is used as an evaporator, the gas collecting pipe is configured to discharge gaseous refrigerant from the pipeline. A liquid collection pipe is connected to the second end of the pipeline. When the copper tube aluminum fin heat exchanger is used as a condenser, the liquid collection pipe is configured to discharge the liquid refrigerant in the pipeline. A capillary tube, connected to the second end of the pipeline, is configured to deliver liquid refrigerant into the pipeline when the copper tube aluminum fin heat exchanger is used as an evaporator.

2. The copper tube aluminum fin heat exchanger as described in claim 1, characterized in that, The several long U-shaped pipes are connected into a single pipeline via U-shaped elbows.

3. The copper tube aluminum fin heat exchanger as described in claim 1, characterized in that, The heat exchange pipeline also includes a tee, the first end of which is connected to the second end of the pipeline, the second end of which is connected to the liquid collection pipe, and the third end of which is connected to the capillary tube.

4. The copper tube aluminum fin heat exchanger as described in claim 1, characterized in that, The capillary tube is covered with a plastic sealing layer.

5. The copper tube aluminum fin heat exchanger as described in claim 1, characterized in that, The liquid collection pipe is equipped with a first one-way valve, which faces outwards. The capillary tube is connected to a second one-way valve, which faces inward.

6. The copper tube aluminum fin heat exchanger as described in claim 5, characterized in that, When there are more than one set of heat exchange pipes, the capillary tubes of each set of heat exchange pipes are connected to the second one-way valve through a liquid separator.

7. The copper tube aluminum fin heat exchanger as described in claim 1, characterized in that, It also includes a protective plate that covers the fins and heat exchange pipes, but exposes at least part of the fins.

8. The copper tube aluminum fin heat exchanger as described in claim 1, characterized in that, The fins are made of aluminum, copper, platinum, or their alloys, and a protective layer is provided on the surface of the fins. The protective layer is formed by electrophoresis, epoxy resin coating, or nano-coating.

9. A method for manufacturing a copper tube aluminum finned heat exchanger as described in any one of claims 1 to 8, characterized in that, include: The arrangement of the long U-tubes and the brazing positions are determined based on the heat exchange requirements. Arrange long U-tubes according to the layout scheme, and connect multiple long U-tubes with U-shaped elbows according to the layout scheme and brazing positions to form at least one pipeline. Connect the first end of each pipe to the gas collection pipe via the first branch pipe, and connect the second end to a tee. Connect the second end of each tee to the liquid collection tube via the second branch pipe, and connect the third end to the capillary tube one by one. A first check valve is connected to the outlet of the collection tube, and each capillary tube is connected to a second check valve through a distributor.

10. A heat pump air conditioner, characterized in that, Including the copper tube aluminum fin heat exchanger as described in any one of claims 1 to 8.

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