Manufacturing method of heat exchanger, heat exchanger and heating and ventilation equipment

Abstract

The invention provides a manufacturing method of a heat exchanger, the heat exchanger and heating and ventilation equipment, and the manufacturing method comprises the steps that at least one fin and at least one heat exchange pipe are provided, welding holes are formed in the fins, and flow guide teeth are arranged on the inner wall of the heat exchange pipe; the heat exchange tubes are arranged in the welding holes in a penetrating mode; and the fins and the heat exchange tubes are welded at the positions of the welding holes. According to the manufacturing method of the heat exchanger, the welding holes are formed in the fins of the heat exchanger, the heat exchange tubes penetrate through the welding holes and are welded to the fins together, the heat exchange tubes and the fins are connected in a welding mode, the heat exchange tubes and the fins are connected through the welding materials, the heat transfer efficiency is higher, and the heat exchange efficiency is improved. Therefore, the problem of low efficiency of the heat exchanger caused by thermal contact resistance between the heat exchange tube and the fins can be relieved.

Description

[0001] Priority information

[0002] This application claims priority to and the benefit of the following patent applications, the entire contents of which are incorporated herein by reference:

[0003] A Chinese patent application submitted to the State Intellectual Property Office of China on November 21, 2023, with application number 202311563605.7 and invention name "Manufacturing method of heat exchanger, heat exchanger and HVAC equipment". Technical Field

[0004] The present application relates to the technical field of heat exchange equipment, and in particular, to a method for manufacturing a heat exchanger, a heat exchanger and HVAC equipment. Background Art

[0005] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0006] In a fin-type heat exchanger, the heat exchange tube is usually fixedly connected to the fin by an interference fit, and a mechanical expansion method is used. There is a contact thermal resistance at the connection position between the heat exchange tube and the fin, which affects the heat exchange between the heat exchange tube and the fin. On the other hand, the heat exchange tube and the fin are connected by mechanical expansion, which will also wear the internal teeth set on the heat exchange tube, thereby affecting the heat exchange efficiency of the heat exchanger. Summary of the invention

[0007] The purpose of this application is to at least alleviate the technical problem of low heat exchange efficiency of the heat exchanger. This purpose is achieved through the following technical solutions:

[0008] A first aspect of the present application provides a method for manufacturing a heat exchanger, the method comprising:

[0009] Providing at least one fin and at least one heat exchange tube, wherein the fin is provided with a welding hole, and the inner wall of the heat exchange tube is provided with a guide tooth;

[0010] Passing the heat exchange tube through the welding hole;

[0011] The fin and the heat exchange tube are welded at the welding hole position.

[0012] The manufacturing method of the heat exchanger of the present application is to set welding holes on the fins of the heat exchanger, and the heat exchange tubes are passed through the welding holes and welded to the fins. The heat exchange tubes and the fins are connected by welding, so that the heat exchange tubes and the fins are connected by welding materials, and the heat transfer efficiency is higher, thereby alleviating the problem of low heat exchanger efficiency caused by contact thermal resistance between the heat exchange tubes and the fins.

[0013] In the manufacturing method of the heat exchanger of the present application, when the guide teeth in the heat exchange tube are located at the welding hole position of the fin, the heat exchange tube is connected to the fin by welding, which can also avoid different degrees of wear of the guide teeth in the heat exchange tube due to mechanical expansion. The heat exchange tube with worn guide teeth will also affect the heat exchange of the heat exchange tube. Therefore, in the manufacturing method of the heat exchanger of the present application, the guide teeth on the inner wall of the heat exchange tube can maintain integrity during the manufacturing process to increase the heat exchange area of ​​the heat exchange tube and the heat exchange efficiency of the entire heat exchanger.

[0014] In addition, the manufacturing method of the heat exchanger according to the present application may also have the following additional technical features:

[0015] In some embodiments of the present application, before welding the fin and the heat exchange tube at the welding hole position, the method further includes:

[0016] The outer surface of the heat exchange tube is coated with a solder layer.

[0017] In some embodiments of the present application, before welding the fin and the heat exchange tube at the welding hole position, the method further includes:

[0018] The outer surface of the fin is coated with a solder layer, or the area to be welded at the welding hole is coated with a solder layer.

[0019] In some embodiments of the present application, before welding the fin and the heat exchange tube at the welding hole position and after the step of inserting the heat exchange tube into the welding hole, the step further includes:

[0020] Flux is sprayed respectively on the welding hole positions of the fins and the areas to be welded of the heat exchange tubes.

[0021] In some embodiments of the present application, the method for manufacturing the heat exchanger further includes the step of processing the heat exchange tube:

[0022] Provide heat exchange tube body,

[0023] The heat exchange tube body is bent into a U-shaped heat exchange tube.

[0024] In some embodiments of the present application, the solder layer coated on the outer surface of the heat exchange tube includes:

[0025] The outer surface of the heat exchange tube is immersed in a solder solution to form a solder layer on the outer surface of the heat exchange tube.

[0026] In some embodiments of the present application, the step of welding the fin and the heat exchange tube at the welding hole position includes:

[0027] Fixing the heat exchange tubes and fins passing through the welding holes to keep them in the welded position;

[0028] Place the heat exchange tubes and fins in a welding posture in a heating furnace;

[0029] The heat exchange tube and the fin are welded at the welding hole position in an automatic welding manner.

[0030] In some embodiments of the present application,

[0031] The heat exchange tube is made of aluminum-based material and / or copper-based material.

[0032] In some embodiments of the present application, the step of providing at least one heat exchange tube further includes:

[0033] The heat exchange tube and the guide teeth on the inner wall thereof are integrally formed, and the guide teeth are used for heat exchange with the medium in the heat exchange tube.

[0034] A second aspect of the present application provides a heat exchanger, comprising:

[0035] at least one fin, wherein the fin is provided with a welding hole,

[0036] At least one heat exchange tube, wherein the inner wall of the heat exchange tube is provided with flow guide teeth;

[0037] The heat exchange tube is passed through the welding hole and fixedly connected by welding.

[0038] A third aspect of the present application provides a HVAC device, which includes the heat exchanger as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0040] Figure 1 A schematic diagram of a method for manufacturing a heat exchanger according to a first embodiment of the present application;

[0041] Figure 2 A schematic diagram of a method for manufacturing a heat exchanger according to a second embodiment of the present application;

[0042] Figure 3 A schematic diagram of a method for manufacturing a heat exchanger according to a third embodiment of the present application;

[0043] Figure 4A schematic diagram of a method for manufacturing a heat exchanger according to a fourth embodiment of the present application;

[0044] Figure 5 A schematic diagram of a method for manufacturing a heat exchanger according to a fifth embodiment of the present application;

[0045] Figure 6 A schematic diagram of a method for manufacturing a heat exchanger according to a sixth embodiment of the present application;

[0046] Figure 7 A schematic diagram of a method for manufacturing a heat exchanger according to a seventh embodiment of the present application;

[0047] Figure 8 A schematic diagram of the structure of the fins of the heat exchanger of the present application is shown;

[0048] Fig. 9 A schematic diagram showing the structure of the heat exchange tube of the heat exchanger of the present application is shown;

[0049] Fig.10 The schematic diagram of the structure of the heat exchange tube and fin combination of the heat exchanger of the present application is shown.

[0050] Reference numerals

[0051] 100, fin; 110, welding hole;

[0052] 200, heat exchange tube; 210, guide tooth; 220, U-shaped heat exchange tube;

[0053] 300. Heat exchanger. DETAILED DESCRIPTION

[0054] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0055] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0056] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0057] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0058] The present application provides a method for manufacturing a heat exchanger, which can reduce the contact thermal resistance between the heat exchange tubes and the fins in the heat exchanger. Compared with the existing connection method between the heat exchange tubes and the fins using mechanical expansion tubes, the heat exchange tubes and the fins are connected by welding materials, and the welding materials are evenly arranged at the connection position between the heat exchange tubes and the fins, so that the heat exchange efficiency between the heat exchange tubes and the fins is higher, thereby improving the heat exchange efficiency of the entire heat exchanger. At the same time, the heat exchange tubes and the fins are connected by welding materials, which has a larger connection area and is more secure. Specifically, combined with Figure 1 The manufacturing method of the heat exchanger of the embodiment of the present application comprises the following steps:

[0059] Providing at least one fin and at least one heat exchange tube with flow guide teeth on the inner wall;

[0060] A welding hole is provided on the fin, and the diameter of the welding hole is adapted to the outer diameter of the heat exchange tube;

[0061] Pass the heat exchange tube through the welding hole;

[0062] The fins are welded to the heat exchange tubes at the welding hole positions.

[0063] In the manufacturing method of the heat exchanger of the embodiment of the present application, the heat exchange tube and the fin are welded at the welding hole position to fix the connection, and the technical effect that can be achieved is that the guide teeth on the inner wall of the heat exchange tube can avoid different degrees of wear caused by the mechanical expansion connection between the heat exchange tube and the fin. Therefore, during the manufacturing process of the heat exchanger, it can be ensured that the guide teeth in the heat exchange tube are in good condition, so as to increase the heat exchange area of ​​the heat exchange tube, thereby improving the heat exchange efficiency of the entire heat exchanger.

[0064] In the step of "inserting the heat exchange tube into the welding hole", the partial tube section with the guide teeth on the inner wall of the heat exchange tube can also be inserted into the welding hole position of the fin. This is because the welding process between the heat exchange tube and the fin can reduce and avoid damage to the guide teeth on the inner wall of the heat exchange tube, so that the heat exchange tube has a larger heat exchange area.

[0065] After the step of "inserting the heat exchange tube into the welding hole", the fins and the heat exchange tube should also be fixed so that the fins and the heat exchange tube maintain the posture required by the welding process. The specific fixing method can be tooling or special equipment for fixing the heat exchange tube and fins.

[0066] The heat exchanger manufactured according to the manufacturing method of the present application may be provided with a plurality of heat exchange tubes and a plurality of fins. The plurality of heat exchange tubes are respectively connected to the plurality of fins to improve the heat exchange efficiency of the heat exchanger.

[0067] In the manufacturing method of the heat exchanger of the embodiment of the present application, a welding hole is provided on the fin, and in the step where the aperture of the welding hole is adapted to the outer diameter of the heat exchange tube, the function of the welding hole is to connect the heat exchange tube to the fin and fix it by welding, wherein the aperture of the welding hole should be adapted to the outer diameter of the heat exchange tube, that is, the aperture of the welding hole satisfies the welding process between the fin and the heat exchange tube, and the aperture of the welding hole can be slightly larger than the outer diameter of the heat exchange tube, so that the welding hole of the fin and the heat exchange tube are matched with a gap, and the gap should be suitable for filling with welding material after welding between the fin and the heat exchange tube. Among them, the welding hole should be a through hole for the heat exchange tube to pass through the through hole.

[0068] When a plurality of fins are arranged in the manufacturing method of the heat exchanger of the embodiment of the present application, each fin should be provided with a welding hole, and the heat exchange tube is connected to the plurality of fins arranged at intervals through the welding hole. When a plurality of heat exchange tubes are arranged, each heat exchange tube is connected to the fin, and a plurality of welding holes can be provided on each fin for connecting the plurality of heat exchange tubes to improve the heat exchange capacity of the heat exchanger and increase the heat exchange amount.

[0069] In the manufacturing method of the heat exchanger of the embodiment of the present application, in the step of inserting the heat exchange tube into the welding hole and fixing the relative positional relationship between the fin and the heat exchange tube, the heat exchange tube is inserted into the welding hole so that the heat exchange tube and the fin can be welded. When the heat exchanger has multiple fins, welding holes are respectively provided on the multiple fins, the multiple fins are arranged in sequence at intervals, and the heat exchange tube is inserted into the welding holes of the multiple fins;

[0070] When the heat exchanger is arranged with multiple heat exchange tubes, multiple welding holes are arranged on the fins, and each heat exchange tube passes through the welding holes on the fins arranged at intervals in sequence;

[0071] Among them, the relative position relationship between the fins and the heat exchange tubes can be fixed with the assistance of tooling. More specifically, the heat exchange tubes are arranged on the tooling in the vertical direction, the fins are mounted on the heat exchange tubes by welding, and the relative position relationship between the heat exchange tubes and the fins is maintained by the tooling.

[0072] When the heat exchanger is arranged with multiple heat exchange tubes and multiple fins, the multiple fins are sequentially penetrated on the multiple heat exchange tubes through welding holes, and adjacent fins are spaced apart, and the relative position relationship between the multiple fins and the multiple heat exchange tubes is maintained by tooling.

[0073] The manufacturing method of the heat exchanger of the embodiment of the present application includes the step of welding the fins to the heat exchange tubes at the welding hole positions, welding the welding hole areas between the fins and the heat exchange tubes in sequence to fix the relative position relationship between the fins and the heat exchange tubes. When the welding process is completed for all welding hole areas, the relative position relationship between the fins and the heat exchange tubes has been fixed, and the welded fins and heat exchange tubes can be removed from the tooling to continue the processing and manufacturing process of the heat exchanger.

[0074] The manufacturing method of the heat exchanger also includes the steps of installing the support assembly, installing the shell, and installing and fixing the spray assembly.

[0075] In the manufacturing method of the heat exchanger of the embodiment of the present application, the fins and the heat exchange tubes are connected by welding, which is different from the existing mechanical expansion tube connection method, so that the heat exchanger has a higher heat exchange efficiency.

[0076] It should be noted that in the manufacturing method of the heat exchanger of the embodiment of the present application, the heat exchange tube can be manufactured using an aluminum-based material, so that the heat exchange tube has stronger corrosion resistance, because the aluminum-based material has excellent anti-"ant hole corrosion" performance, and also has other advantages such as low cost and recycling. The aluminum-based material includes aluminum alloys, etc. The specific profiles can be aluminum round tubes, aluminum flat tubes, and aluminum bending parts or elbows can also be used in some parts.

[0077] The heat exchange tubes can also be made of copper-based materials, and the excellent thermal conductivity of the copper-based materials can be used to make the heat exchanger have a higher heat exchange efficiency.

[0078] In one embodiment of the manufacturing method of the heat exchanger of the present application, the heat exchange tubes and fins of the heat exchanger are both made of aluminum-based materials. During the welding process, the heat exchange tubes are welded to the welding holes of the fins by controlling the temperature of the welding flame. The temperature fluctuation of the welding flame during the welding process should be small, such as being controlled within the range of 50°C. More specifically, for example, when the welding material melts at 660°C, the temperature of the welding flame should be controlled between 630°C and 680°C. When the welding material melts at 640°C, the temperature of the welding flame should be controlled within the range of 600°C to 650°C. The purpose of this arrangement is to reduce the deformation effect on the heat exchange tubes and fins made of aluminum-based materials during the welding process. At the same time, the heat exchange tubes and fins in this embodiment are made of the same aluminum-based material, which is conducive to controlling the welding flame within a reasonable range.

[0079] The heat exchange tubes and fins of the heat exchanger may also be made of copper-based materials, or other metal materials of the same type.

[0080] The manufacturing method of the heat exchanger of the embodiment of the present application includes the steps of: arranging guide teeth on the inner wall of the heat exchange tube to form a tooth-shaped structure for increasing the heat conduction area, and the tooth-shaped structure is arranged in the heat exchange tube. When the refrigerant medium passes through the heat exchange tube, the refrigerant medium contacts the tooth-shaped structure in the heat exchange tube, which is equivalent to increasing the heat exchange area between the heat exchange tube and the refrigerant medium. Therefore, by arranging the tooth-shaped structure in the heat exchange tube, the heat exchange amount of the heat exchange tube per unit time can be increased, thereby improving the heat exchange efficiency of the heat exchanger.

[0081] In one embodiment of the method for manufacturing a heat exchanger of the present application, Figure 2 After providing at least one heat exchange tube, the manufacturing method further includes: coating the outer surface of the heat exchange tube with a solder layer. In this embodiment, the heat exchange tube with the solder layer is inserted into the welding hole of the fin, and the heat exchange tube and the fin are fixed together by welding in the area near the welding hole. The outer surface of the heat exchange tube is covered with a layer of solder. When the solder is heated and melted, it can be more evenly bonded to the heat exchange tube, thereby making the connection between the fin and the heat exchange tube more firm.

[0082] Especially when the heat exchange tubes of the heat exchanger are made of aluminum-based materials, a solder layer is coated on the outer surface of the heat exchange tubes made of the aluminum-based materials. The molten solder layer fixes the heat exchange tubes and the fins, making the welding of the heat exchange tubes made of the aluminum-based materials more secure. At the same time, the aluminum-based materials have excellent properties of preventing "ant hole corrosion", therefore, the service life of the heat exchange tubes in the heat exchanger can be increased.

[0083] Coating the outer surface of the heat exchange tube with a solder layer is also conducive to realizing automatic welding between the heat exchange tube and the fin. When multiple heat exchange tubes are arranged in the heat exchanger, the outer surfaces of the multiple heat exchange tubes are coated with a solder layer, and the multiple heat exchange tubes are respectively inserted into the welding holes of the fins. The heat exchange tubes are heated in a heating furnace to melt the solder near the welding holes of the multiple heat exchange tubes at the same time, and the multiple heat exchange tubes are welded and fixed to the fins at the same time, which can greatly improve the manufacturing efficiency of the heat exchanger.

[0084] It should be noted that there should be a clearance fit between the heat exchange tube with the solder layer and the welding hole of the fin. On the one hand, the welding hole should be suitable for the heat exchange tube with the solder layer to pass freely through it. On the other hand, the welding hole should meet the welding process between the heat exchange tube and the fin. When the welding process is completed, the heat exchange tube should be firmly connected to the fin with solder to minimize the influence of the contact thermal resistance between the heat exchange tube and the fin on the heat exchange.

[0085] When the heat exchange tubes of the heat exchanger are made of aluminum-based material, in the step of providing at least one heat exchange tube, a step of arranging guide teeth in the heat exchange tube can be added. By adding guide teeth in the heat exchange tube made of aluminum-based material, the heat exchange capacity per unit area of ​​the heat exchange tube is increased, thereby improving the heat exchange efficiency of the heat exchanger as a whole.

[0086] In one embodiment of the method for manufacturing a heat exchanger of the present application, Figure 3 In the step of providing at least one fin, the manufacturing method further comprises: coating the outer surface of the fin with a solder layer, and after the heat exchange tube is inserted into the welding hole of the fin by coating the solder layer on the outer surface of the fin, the fin and the heat exchange tube can be more firmly welded and fixed. The fin of the heat exchanger in this embodiment is a composite fin. Before the fin and the heat exchange tube are welded, the solder layer is coated on the outer surface of the fin, which is conducive to increasing the connection strength of the fin after welding.

[0087] A solder layer is evenly arranged on the entire outer surface of the fin, and the fin is processed into a composite fin, which can improve the processing efficiency of the fin. In particular, when a plurality of composite fins need to be manufactured, the solder layers of a plurality of fins can be processed at the same time, thereby improving production efficiency. After the entire composite fin is manufactured, it can be divided into a plurality of independent fins suitable for arrangement in a heat exchanger. A plurality of independent fins can be arranged in the heat exchanger at intervals, thereby improving the heat exchange efficiency of the heat exchanger.

[0088] It is also possible to coat the solder layer in the area near the welding hole of the fin. Coating the solder layer in the local area of ​​the fin can save the use of solder and help save costs. Especially when batch processing and manufacturing fins with solder layers, the solder layer is only arranged in the welding hole area of ​​the fin that needs to be welded, which can not only improve the welding connection strength of the fin, but also save the use of solder.

[0089] In the manufacturing method of the heat exchanger of the present embodiment, a solder layer is arranged on the outer surface of the fin, and the solder layer evenly covers the to-be-welded area of ​​the welding hole of the fin. When the solder layer is heated and melted, it can be evenly and tightly connected to the fin substrate, thereby improving the connection strength between the fin substrate and the solder and between the fin substrate and the heat exchange tube. When the fin and the heat exchange tube have good connection reliability, the heat exchange between the heat exchange tube and the fin is more efficient, thereby reducing the influence of the contact thermal resistance between the fin and the heat exchange tube on the heat exchange.

[0090] Arranging a solder layer on the outer surface of the fin of the heat exchanger is conducive to automatic welding. When the heat exchange tube is inserted into the welding hole of the fin and the relative position of the heat exchange tube and the fin is fixed, the welding hole area of ​​the fin is heated to melt the solder layer in the welding hole area and connect it with the heat exchange tube. The manufacturing method in this embodiment is suitable for the implementation method of arranging multiple fins in the heat exchanger. Each fin is arranged with multiple welding holes. By heating multiple fins at the same time, multiple fins are welded to the heat exchange tube at the welding hole position, which can improve welding efficiency and is more conducive to shortening the processing time of the entire heat exchanger, reserving more time for other processes of the heat exchanger.

[0091] In the manufacturing method of the heat exchanger of the present embodiment, the step of fixing the relative positions of the heat exchange tubes and the fins also includes fixing the relative positions of the heat exchange tubes and the fins with the assistance of a tool, wherein the tool has a supporting structure for supporting a plurality of heat exchange tubes and a plurality of fins arranged at intervals. With the support of the tool on the heat exchange tubes and the fins, the heat exchange tubes and the fins are welded and fixed at the welding hole positions to connect the heat exchange tubes and the fins as a whole. After completing the welding process, the tool is removed, and then other installation and manufacturing processes of the heat exchanger are arranged.

[0092] In one embodiment of the method for manufacturing a heat exchanger of the present application, Figure 4 After the relative positions of the heat exchange tubes and the fins are fixed, the method further includes the steps of: spraying flux on the welding hole areas of the fins and the areas to be welded of the heat exchange tubes; after the relative positions of the heat exchange tubes and the fins are fixed and before welding the heat exchange tubes and the fins, the flux is evenly arranged on the areas to be welded of the fins and the heat exchange tubes by spraying, so as to ensure the welding quality of the welding areas.

[0093] When the heat exchanger has multiple heat exchange tubes and multiple fins, there are multiple areas to be welded between the heat exchange tubes and the fins, and the multiple areas to be welded are spaced apart from each other. By spraying, the flux can be arranged in each area to be welded, so that each connection position between the heat exchange tube and the fin is firmly welded and fixed, thereby improving the overall connection strength between the heat exchange tube and the fin.

[0094] In one embodiment of the method for manufacturing a heat exchanger of the present application, Figure 5 , further comprising the steps of:

[0095] Providing a heat exchange tube body;

[0096] The heat exchange tube body is bent into a U-shaped heat exchange tube;

[0097] The following steps may also be included:

[0098] The U-shaped heat exchange tube is inserted into the welding hole of the fin, and the relative position relationship between the U-shaped heat exchange tube and the fin is fixed;

[0099] The fins and the U-shaped heat exchange tubes are welded at the welding hole positions.

[0100] The manufacturing method of the heat exchange tube in this embodiment bends the heat exchange tube into a U-shaped heat exchange tube by adding a tube bending process, so as to reduce the welding positions between the heat exchange tubes, thereby reducing the unreliability of the connection positions of the heat exchange tubes.

[0101] The tube bending process can be arranged after the step of coating the outer surface of the heat exchange tube with a solder layer, and the solder layer is arranged on the continuous whole heat exchange tube. In the continuous process, the solder layer on the heat exchange tube is more uniform, and the thickness and uniformity of the solder layer will not be affected by the bending area. The heat exchange tube coated with the solder layer can be welded to the fin at any position on the heat exchange tube at the same time, and each position can ensure that the heat exchange tube and the fin have a high welding connection strength. Therefore, the welding position of the heat exchange tube does not need to be arranged in advance, and can be welded at the welding hole position of the heat exchange tube penetrating any fin according to actual needs, so that the heat exchange tube has higher adaptability to welding processes.

[0102] Among them, the tube bending process can also be set before the step of coating the outer surface of the heat exchange tube with a solder layer, first bending the heat exchange tube, and then arranging the solder layer on the outer surface of the U-shaped heat exchange tube. Compared with the entire heat exchange tube before bending, the U-shaped heat exchange tube has a shorter effective length and occupies less space. Therefore, the U-shaped heat exchange tube is more suitable for immersion in a solder solution, and there is no strict length requirement for the container containing the solder solution.

[0103] In the step of arranging the solder layer on the surface of the heat exchange tube, the outer surface of the heat exchange tube may be immersed in a solder solution, thereby forming the solder layer on the outer surface of the heat exchange tube.

[0104] Similarly, the fins can also be placed in a solder solution to form a solder layer on the outer surface of the fins. The solder layer can be arranged on the outer surface of the heat exchange tube or the outer surface of the fin by immersing the fin in the solder solution. This has the advantage of being simple and easy to operate, so that the solder layer is arranged at various positions on the outer surface of the heat exchange tube or the fin.

[0105] The above-mentioned method for arranging the solder layer on the outer surface of the heat exchange tube is particularly suitable for heat exchange tubes made of aluminum-based materials and heat exchange tubes made of copper-based materials, and is also suitable for other heat exchange tubes with multi-layer structures.

[0106] Alternatively, a local area of ​​the heat exchange tube can be immersed in a solder solution, a solder layer can be arranged in a specific area of ​​the heat exchange tube, the heat exchange tube with the solder layer can be inserted into the welding hole of the fin, and the tube section with the solder layer can be welded and fixed to the fin. This arrangement requires setting the welding position on the heat exchange tube in advance, and completing the welding process with the fin according to the preset welding position.

[0107] In one embodiment of the method for manufacturing a heat exchanger of the present application, Figure 6 and Figure 7 In the step of welding the fins and the heat exchange tubes at the welding hole positions, the heat exchange tubes and the fins are welded at the welding hole positions by automatic welding or manual welding. Specifically, the welding method may be brazing or other welding methods according to actual needs. The welding method is not specifically limited in this embodiment.

[0108] It should be noted that the welding process of the heat exchanger includes welding between the heat exchange tubes and fins, as well as welding between the heat exchange tubes. The heat exchange tubes also include collecting tubes, branch tubes, distribution tubes and capillaries, etc. Different heat exchange tubes also require welding processes. Therefore, different welding processes can be set according to actual needs and the specific location of the heat exchanger to ensure that different heat exchange tubes have higher connection strength.

[0109] In the manufacturing method of the heat exchanger in any of the above embodiments given in the present application, heat exchange tubes made of aluminum-based materials and heat exchange tubes made of copper-based materials are preferably used. Aluminum-based materials and copper-based materials have excellent thermal conductivity. Aluminum-based materials also have excellent properties of preventing anthill corrosion, as well as the advantages of low cost and recyclability.

[0110] Since the manufacturing method of the heat exchanger of the present application has little impact on the structure inside the heat exchange tube, a toothed structure can be set inside the heat exchange tube. The function of the toothed structure is to increase the contact area between the heat exchange tube and the refrigerant medium inside it. Compared with the existing mechanical expansion tube structure, the manufacturing methods in different embodiments of the present application can ensure that the toothed structure has good integrity and there is no wear on the toothed structure during the manufacturing process.

[0111] The present application also provides a heat exchanger 300, which is manufactured according to the manufacturing method of the heat exchanger in any of the above embodiments, and may also have the specific structure involved in any of the above embodiments. The heat exchanger 300 of the present application inputs a refrigerant medium into the heat exchange tube 200, and performs heat exchange with the refrigerant medium through the heat exchange tube 200 and the fin 100 connected to the heat exchange tube 200. The heat exchanger of the present application has a high heat exchange efficiency:

[0112] One of the reasons is that the welding method ensures that the heat exchange tubes and fins have a high connection strength and excellent thermal conductivity, so that the refrigerant medium can have good heat exchange with the outside world.

[0113] The second reason is that the use of welding can reduce the wear of the toothed structure in the heat exchange tube during the processing and manufacturing process, so that the heat exchange tube has a larger heat exchange area, and thus the heat exchanger as a whole has a higher heat exchange efficiency.

[0114] like Figure 8 As shown, a plurality of welding holes 110 are provided in the fin 100 of the heat exchanger 300 for passing the heat exchange tube 200 or the U-shaped heat exchange tube 220, and the heat exchange tube 200 or the U-shaped heat exchange tube 220 is welded and fixed in the welding hole 110 of the fin 100 by using any of the manufacturing methods described above.

[0115] like Fig. 9As shown, the inner wall of the heat exchange tube 200 of the heat exchanger 300 is provided with a guide tooth 210, wherein the guide tooth 210 can be integrally formed on the inner wall of the heat exchange tube 200. Fig. 9 A plurality of guide teeth 210 are provided in the heat exchange tube, and the plurality of guide teeth 210 can increase the heat exchange area of ​​the heat exchange medium in the heat exchange tube. The heat exchanger 300 provided in the present application adopts a welding process to fix the heat exchange tube in the welding hole 110 of the fin, and can ensure the integrity of the guide teeth during the manufacturing process of the heat exchanger 300. Compared with mechanical expansion tubes, it has obvious advantages.

[0116] like Fig.10 As shown, in one embodiment of the heat exchanger 300 provided in the present application, a plurality of U-shaped heat exchange tubes 220 are inserted into the welding holes 110 of the fins 100, and the combined U-shaped heat exchange tubes and fins can be placed in a heating furnace. The manufacturing method in any of the above embodiments can be adopted to control the temperature in the heating furnace and weld them as a whole, which is beneficial to improving the manufacturing efficiency of the heat exchanger.

[0117] In summary, the heat exchanger 300 provided in the present application uses a welding process to fix the welding holes of the heat exchange tubes and the fins, thereby ensuring the integrity of the guide teeth in the heat exchange tubes, so that the heat exchanger 300 has a higher heat exchange area and heat exchange efficiency. By controlling the flame temperature within a reasonable range, the heat exchange tubes and fins are set to the same type of metal material, such as aluminum-based material or copper-based material, to reduce the deformation of the heat exchange tubes and fins.

[0118] The present application also provides a HVAC device, which includes the heat exchanger as described above.

[0119] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for manufacturing a heat exchanger, It is characterized in that The manufacturing method of the heat exchanger comprises: Providing at least one fin and at least one heat exchange tube, wherein the fin is provided with a welding hole, and the inner wall of the heat exchange tube is provided with a guide tooth; Passing the heat exchange tube through the welding hole; The fin and the heat exchange tube are welded at the welding hole position.

2. The method for manufacturing a heat exchanger according to claim 1, It is characterized in that Before the step of welding the fin and the heat exchange tube at the welding hole position, the step further includes: The outer surface of the heat exchange tube is coated with a solder layer.

3. The method for manufacturing a heat exchanger according to claim 1, It is characterized in that Before the step of welding the fin and the heat exchange tube at the welding hole position, the step further includes: The outer surface of the fin is coated with a solder layer, or the area to be welded at the welding hole is coated with a solder layer.

4. The method for manufacturing a heat exchanger according to claim 1, It is characterized in that Before the step of welding the fin and the heat exchange tube at the welding hole position, and after the step of inserting the heat exchange tube into the welding hole, the method further includes: Flux is sprayed respectively on the welding hole positions of the fins and the areas to be welded of the heat exchange tubes.

5. The method for manufacturing a heat exchanger according to claim 2, It is characterized in that The manufacturing method of the heat exchanger further comprises the steps of processing the heat exchange tube: Provide heat exchange tube body, The heat exchange tube body is bent into a U-shaped heat exchange tube.

6. The method for manufacturing a heat exchanger according to claim 2, It is characterized in that The solder layer coated on the outer surface of the heat exchange tube comprises: The outer surface of the heat exchange tube is immersed in a solder solution to form a solder layer on the outer surface of the heat exchange tube.

7. The method for manufacturing a heat exchanger according to any one of claims 1 to 5, It is characterized in that The step of welding the fin and the heat exchange tube at the welding hole position comprises: Fixing the heat exchange tubes and fins passing through the welding holes to keep them in the welded position; Place the heat exchange tubes and fins in a welding posture in a heating furnace; The heat exchange tube and the fin are welded at the welding hole position in an automatic welding manner.

8. The method for manufacturing a heat exchanger according to claim 7, It is characterized in that The heat exchange tube is made of aluminum-based material and / or copper-based material.

9. The method for manufacturing a heat exchanger according to claim 7, It is characterized in that The step of providing at least one heat exchange tube further includes: The heat exchange tube and the guide teeth on the inner wall thereof are integrally formed, and the guide teeth are used for heat exchange with the medium in the heat exchange tube.

10. A heat exchanger, It is characterized in that The heat exchanger comprises: at least one fin, wherein the fin is provided with a welding hole, At least one heat exchange tube, wherein the inner wall of the heat exchange tube is provided with flow guide teeth; The heat exchange tube is passed through the welding hole and fixedly connected by welding.

11. A heating and ventilation equipment, It is characterized in that The HVAC equipment comprises the heat exchanger of claim 10.

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