Welding device

Abstract

The utility model provides a kind of welding device, including mounting seat, and welding cavity is equipped in mounting seat;Mounting seat is equipped with first installation port and second installation port;Multiple first clamps are detachably embedded in first installation port, the shape of the first clamping hole of each first clamp is different, and first shape pipe can be inserted into welding cavity through first clamping hole;Multiple second clamps are detachably embedded in second installation port, the shape of the second clamping hole of each second clamp is different, and second shape pipe can be inserted into welding cavity through second clamping hole;Heating assembly;When a first clamp is embedded in first installation port and a second clamp is embedded in second installation port, first clamp, second clamp and mounting seat form welding cavity;Part of heat generated by heating assembly is transmitted to welding cavity through mounting seat, and part of heat is transmitted to first clamp and second clamp to heat first shape pipe and second shape pipe.The present welding device is suitable for brazing of pipe fittings with different shapes and sizes.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger manufacturing technology, and mainly to a welding device. Background Technology

[0002] In refrigeration systems, common heat exchangers include evaporators and condensers. The evaporator is the heat-absorbing component in the refrigeration cycle. The refrigerant evaporates in the evaporator, absorbing heat from inside the refrigerator, thereby lowering the internal temperature of the refrigeration system. The condenser is the heat-releasing component in the refrigeration cycle. The refrigerant condenses into a liquid in the condenser, releasing the heat absorbed from inside the refrigerator into the external environment.

[0003] In an increasing number of microchannel flat tube heat exchangers, flat tubes are welded to round tubes to form joint tubes. Typically, the flat tubes and round tubes are made of dissimilar metals, and brazing can be used during welding to improve the weld strength.

[0004] However, current welding fixtures are mainly designed for welding pipes of the same shape and size. It is difficult to use the same welding equipment to braze pipes of different shapes or sizes. Utility Model Content

[0005] The purpose of this invention is to provide a welding device that can be used for brazing pipes of different shapes and sizes.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] One aspect of this application provides a welding apparatus, including a mounting base with a welding cavity therein; the mounting base has a first sidewall and a second sidewall, the first sidewall having a first mounting opening and the second sidewall having a second mounting opening, the first mounting opening and the second mounting opening respectively communicating with the welding cavity; a plurality of first clamps detachably fitted into the first mounting opening, each first clamp having a first clamping hole of different shapes, the first clamping hole being used to place a first shaped tube, the first shaped tube being able to extend into the welding cavity through the first clamping hole; a plurality of second clamps detachably fitted into the second mounting opening, each second clamp... Each component is provided with a second clamping hole, each with a different shape. The second clamping hole is used to place a second shaped tube, which can extend into the welding cavity through the second clamping hole. A heating assembly is disposed on the mounting base. When a first clamp is fitted into the first mounting opening and a second clamp is fitted into the second mounting opening, the first clamp, the second clamp, and the mounting base form the welding cavity. When the heating assembly heats, part of the heat generated by the heating assembly is transferred to the welding cavity through the mounting base, and part of the heat is transferred to the first clamp and the second clamp to heat the first shaped tube and the second shaped tube.

[0008] The above technical solution has the following advantages or beneficial effects: By setting multiple first clamps with first clamping holes of different shapes and multiple second clamps with second clamping holes of different shapes, and each first clamp and second clamp being detachably mounted on its corresponding mounting port, welding of pipe fittings of different shapes and sizes can be achieved. Thus, the welding device of this application can achieve compatible welding of pipes of different shapes and sizes. Compared with the prior art, the welding device of this application has higher versatility and flexibility, and can adapt to various complex welding needs. At the same time, it is simple to operate; only by replacing different first and second clamps and starting the heating assembly can the brazing process be achieved.

[0009] This application discloses a welding apparatus, wherein a first clamping hole is flat and is used to clamp a first-shaped tube in the shape of a flat tube; and a second clamping hole is round and is used to clamp a second-shaped tube in the shape of a round tube.

[0010] Another technical solution in the above-mentioned technical solution has the following advantages or beneficial effects: by using a first clamping hole in the shape of a flat hole to clamp the flat tube, and a second clamping hole in the shape of a round hole to clamp the round tube, and by using a first clamp with a first clamping hole in the shape of a flat hole and a second clamp with a second clamping hole in the shape of a round hole, the flat tube and the round tube can be welded together, which meets the requirements for evaporator manufacturing in refrigeration equipment.

[0011] This application discloses a welding apparatus. The mounting base has a third sidewall, one side of which is connected to a first sidewall, and the other side of which is connected to a second sidewall. The third sidewall has a third mounting opening. The welding apparatus further includes a third clamp, which is detachably fitted into the third mounting opening. The third clamp has a third clamping hole for placing a third-shaped tube, which can extend into the welding cavity through the third clamping hole. Multiple third clamps are provided, and the shape of the third clamping hole of each third clamp is different.

[0012] Another technical solution described above has the following advantages or beneficial effects: Since the first and second sidewalls are arranged opposite each other, and the third sidewall is located on the same side of both and connects them, different clamps can be arranged within the three-dimensional space of the mounting base. Furthermore, by utilizing the spatial arrangement structure of the third clamp with the first and second clamps, multi-pipe intersection structures can be welded, enabling the welding device to weld more irregularly shaped pipes, thus making it suitable for welding more complex pipes and improving the versatility of the welding device.

[0013] This application discloses a welding device, wherein a first sidewall and a second sidewall are disposed on opposite sides of the mounting base, a first clamp and a second clamp are disposed opposite to each other, and a third sidewall is located on the same side of the first sidewall and the second sidewall and is connected to the first sidewall and the second sidewall respectively.

[0014] Another technical solution described above has the following advantages or beneficial effects: The first and second clamps, arranged opposite to each other, can correspondingly clamp a first-shaped tube and a second-shaped tube in the form of a straight tube. The straight tube can be welded using the first and second clamps. A bent tube can be formed by welding using a third clamp located on one side of the first clamp and on one side of the second clamp, or by using the third clamp and the first clamp, or by using the third clamp and the second clamp. Thus, using the same welding device, brazing between straight tubes, brazing between bent tubes, or brazing between straight and bent tubes can be achieved.

[0015] This application discloses a welding apparatus, wherein the mounting base is provided with an exhaust hole, the exhaust hole being in communication with the welding cavity; any one of the first clamping hole, the second clamping hole, and the third clamping hole can be used to introduce inert gas into the welding cavity.

[0016] Another technical solution in the above-mentioned technical solution has the following advantages or beneficial effects: two of the first clamping hole, the second clamping hole and the third clamping hole are used to clamp the pipe to be welded, and the remaining of the first clamping hole, the second clamping hole and the third clamping hole are used as channels for the introduction of inert gas (such as argon, nitrogen, etc.). This not only makes the welding cavity a closed space, but the introduction of inert gas can effectively isolate oxygen, prevent metal oxidation during welding, reduce oxide inclusions in the weld, and thus effectively improve the mechanical properties of the weld.

[0017] This application discloses a welding device, wherein the mounting base includes a base, the top surface of the base is recessed downwards, and the peripheral sidewall of the base is recessed with a first mounting port and a second mounting port; a top cover is detachably mounted on the top surface of the base; and the welding cavity is formed between the bottom surface of the top cover and the top surface of the base.

[0018] Another technical solution described above has the following advantages or beneficial effects: the top surface of the base is recessed downwards to form a space for welding. When the top cover is placed on the top surface of the base, a welding cavity can be formed, and the bottom surface of the top cover and the top surface of the base are connected. Furthermore, a closed welding cavity can be formed by the installation and cooperation of the first clamp, the second clamp, and the third clamp. By detachably connecting the base and the top cover, the user can remove the top cover to clean the debris in the welding cavity. At the same time, before brazing the first shaped tube, the second shaped tube, or the third shaped tube, the part of the tube to be welded can be pre-positioned by opening the top cover. For example, the connecting ends of the first shaped tube and the second shaped tube to be brazed can be pre-inserted together. On the other hand, the base and the top cover can be processed separately, reducing manufacturing complexity and improving production efficiency.

[0019] This application discloses a welding device, wherein a first stop rib is formed between the bottom surface of the welding cavity and the bottom surface of the first mounting port; a first step groove is provided on the top side of the first clamp away from the welding cavity; a first stop portion is provided on the bottom surface of the top cover facing downward, and the first stop portion and the first step groove are arranged vertically opposite each other; when the first clamp is fitted into the first mounting port and the top cover is placed on the top surface of the base, the side wall of the first clamp near the welding cavity abuts against the first stop rib, and the first stop portion can be engaged with the first step groove.

[0020] Another technical solution described above has the following advantages or beneficial effects: By setting a first stop rib to limit the depth of the first clamp embedded in the fixed seat, the first clamp can be prevented from extending excessively into the fixed seat, thus leaving space for welding. Furthermore, the user can confirm whether the first clamp is installed correctly by engaging the first stop part into the first stepped groove, improving the reliability of the welding device. Further, by arranging the first stepped groove on the top of the first clamp and the first stop part on the bottom surface of the top cover vertically opposite each other, when the top cover is closed, the first stop part engages in the first stepped groove, thereby limiting the installation port side of the first clamp and preventing it from moving up and down due to vibration or external force. On the other hand, after the top cover is closed, the first stop part engaging in the first stepped groove further enhances the sealing of the top of the welding cavity, preventing external air from entering or internal gas from escaping through the first installation port, thereby improving the reliability of the brazing environment.

[0021] This application discloses a welding device, wherein a second stop rib is formed between the bottom surface of the welding cavity and the bottom surface of the second mounting port; a second step groove is provided on the top side of the second clamp away from the welding cavity; a second stop portion is provided on the bottom surface of the top cover facing downward, and the second stop portion and the second step groove are arranged vertically opposite each other; when the second clamp is fitted into the second mounting port and the top cover is placed on the top surface of the base, the side wall of the second clamp near the welding cavity abuts against the second stop rib, and the second stop portion can be engaged with the second step groove.

[0022] Another technical solution described above has the following advantages or beneficial effects: By setting a second stop rib to limit the depth of the second clamp embedded in the fixed seat, the second clamp can be prevented from extending excessively into the fixed seat, thus leaving space for welding. Furthermore, the user can confirm whether the second clamp is installed correctly by engaging the second stop part into the second step groove, improving the reliability of the welding device. Further, by arranging the second step groove on the top of the second clamp and the second stop part on the bottom surface of the top cover vertically opposite each other, when the top cover is closed, the second stop part engages in the first step groove, thereby limiting the mounting port side of the second clamp and preventing it from moving up and down due to vibration or external force. On the other hand, after the top cover is closed, the second stop part engaging in the second step groove further enhances the sealing of the top of the welding cavity, preventing external air from entering or internal gas from escaping through the second mounting port, thereby improving the reliability of the brazing environment.

[0023] This application discloses a welding apparatus in which a third stop rib is formed between the bottom surface of the welding cavity and the bottom surface of the third mounting port; a third step groove is provided on the top side of the third clamp away from the welding cavity; a third stop portion is provided on the bottom surface of the top cover facing downward, and the third stop portion and the third step groove are arranged vertically opposite each other; when the third clamp is fitted into the third mounting port and the top cover is placed on the top surface of the base, the side wall of the third clamp near the welding cavity abuts against the third stop rib, and the third stop portion can be engaged with the third step groove.

[0024] Another technical solution described above has the following advantages or beneficial effects: By setting a third stop rib to limit the depth of the third clamp embedded in the fixed seat, the third clamp can be prevented from extending excessively into the fixed seat, thus leaving space for welding. Furthermore, the user can confirm whether the third clamp is installed correctly by engaging the third stop part into the third step groove, improving the reliability of the welding device. Further, by arranging the third step groove on the top of the third clamp and the third stop part on the bottom surface of the top cover vertically opposite each other, when the top cover is closed, the third stop part engages in the first step groove, thereby limiting the installation port side of the third clamp and preventing it from moving up and down due to vibration or external force. On the other hand, after the top cover is closed, the third stop part engaging in the third step groove further enhances the sealing of the top of the welding cavity, preventing external air from entering or internal gas from escaping through the second installation port, thereby improving the reliability of the brazing environment.

[0025] This application discloses a welding apparatus, wherein the sidewall of the first clamp facing the welding cavity is a first end face, and the sidewall of the first clamp away from the welding cavity is a second end face; the two ends of the first clamping hole respectively penetrate the first end face and the second end face; the end of the first clamping hole near the first end face is a first end, and the port of the first end forms a welding groove, the two ends of the welding groove are respectively spaced apart from the two ends of the first clamping hole along the width direction; the welding groove extends toward the hole walls on opposite sides of the first clamping hole so that a second shaped tube can extend into the first clamping hole through the welding groove.

[0026] Another technical solution in the above-mentioned technical solution has the following advantages or beneficial effects: by setting a welding groove at one end of the first clamping hole near the welding cavity, the welding position of the first shaped tube and the second shaped tube is in the first fixture. Since the shape of the first clamping hole has a spatial restriction effect on the tube to be welded, the size change of the gap can be effectively reduced during the brazing process, thereby effectively improving the problem of leakage at the weld. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the specification, serve to explain the principles of this application.

[0028] Figure 1 This is a schematic diagram of a welding apparatus according to an embodiment of this application;

[0029] Figure 2 for Figure 1 A schematic diagram from another perspective;

[0030] Figure 3 for Figure 2 An exploded view;

[0031] Figure 4 for Figure 1 A cross-sectional view;

[0032] Figure 5 for Figure 2 A partial exploded view;

[0033] Figure 6 for Figure 3 A schematic diagram of the central base;

[0034] Figure 7 for Figure 3 Schematic diagram of the top cover;

[0035] Figure 8 for Figure 3 A schematic diagram of the first fixture in the middle;

[0036] Figure 9 for Figure 3 A schematic diagram of the second clamp;

[0037] Figure 10 for Figure 3 A schematic diagram of the third clamp in the middle;

[0038] Figure 11 for Figure 1 A schematic diagram of the first clamp in another embodiment;

[0039] Figure 12 for Figure 11 An exploded image.

[0040] A schematic diagram of a welding apparatus according to an embodiment of this application;

[0041] The correspondence between the reference numerals and the component names is as follows:

[0042] 1. Mounting base; 101. Welding cavity; 102. First mounting port; 103. Second mounting port; 104. Third mounting port; 104. Vent hole; 105. First side wall; 106. Second side wall; 107. Third side wall; 1081. First stepped groove; 1082. Second stepped groove; 1083. Third stepped groove; 1091. First recess; 1092. Second recess; 1093. Third recess; 11. Base; 12. Top cover; 131. First stop rib; 132. Second stop rib; 133. Third stop rib; 141. First stop part; 142. Second stop part; 143. Third stop part;

[0043] 2. First clamp; 201. First clamping hole; 2011. First end; 2012. Welding groove; 202. First end face; 203. Second end face; 21. First end face;

[0044] 3. Second clamp; 301. Second clamping hole;

[0045] 4. Heating assembly; 41. First heating element; 42. Second heating element;

[0046] 5. Third clamp; 501. Third clamping hole;

[0047] 6. Temperature sensor;

[0048] 100. First-shaped tube; 200. Second-shaped tube; 300. Third-shaped tube; Detailed Implementation

[0049] This utility model provides a welding device. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit the scope of protection of this utility model.

[0050] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0051] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0052] In refrigeration systems, common heat exchangers include evaporators and condensers. The evaporator is the heat-absorbing component in the refrigeration cycle. The refrigerant evaporates in the evaporator, absorbing heat from inside the refrigerator, thereby lowering the internal temperature of the refrigeration system. The condenser is the heat-releasing component in the refrigeration cycle. The refrigerant condenses into a liquid in the condenser, releasing the heat absorbed from inside the refrigerator to the external environment.

[0053] It should be noted that the refrigeration device can be a freezer, refrigerator, or other refrigeration cabinet.

[0054] In an increasing number of microchannel flat tube heat exchangers, flat tubes are welded to round tubes to form joint tubes. Typically, the flat tubes and round tubes are made of dissimilar metals, and brazing can be used during welding to improve the weld strength.

[0055] However, current welding fixtures are mainly designed for welding pipes of the same shape and size. It is difficult to use the same welding equipment to braze pipes of different shapes or sizes.

[0056] Figure 1 This is a schematic diagram of a welding apparatus according to an embodiment of this application; Figure 2 for Figure 1 A schematic diagram from another perspective.

[0057] Please see Figure 1 and Figure 2 As shown, this utility model provides a welding device that can be used for brazing pipes of different shapes or sizes.

[0058] Figure 3 for Figure 2 An exploded image.

[0059] like Figure 3 As shown, in some embodiments, the welding apparatus includes a mounting base 1. The mounting base 1 may have a welding cavity 101. The mounting base 1 can be used to mount the pipe fitting to be welded and to allow the pipe fitting to be brazed in the welding cavity 101.

[0060] like Figure 1 and Figure 3 As shown, in some embodiments, the mounting base 1 may have a first sidewall 105. The first sidewall 105 is provided with a first mounting opening 102. The first mounting opening 102 communicates with the welding cavity 101. The welding apparatus includes a first clamp 2. The first clamp 2 is provided with a first clamping hole 201 for placing a first shaped tube 100, which can extend into the welding cavity 101 through the first clamping hole 201.

[0061] The mounting base 1 has a first mounting opening 102 on its first side wall 105. The first mounting opening 102 is used to mount the first clamp 2. The first clamp 2 has a first clamping hole 201 whose shape can be adapted to the shape and size of the pipe to be welded. Correspondingly, the first clamping hole 201 clamps the first shaped tube 100. In this way, by passing the first shaped tube 100 through the first clamping hole 201 and embedding the first clamp 2 in the first mounting opening 102, the first clamp 2 can extend into the welding cavity 101 through the first clamping hole 201 and be brazed in the welding cavity 101.

[0062] In some embodiments, there may be multiple first clamps 2. Multiple first clamps 2 are detachably fitted into the first mounting opening 102. Each first clamping hole 201 has a different shape.

[0063] In this way, by replacing different first clamps 2, different sizes or shapes of first shaped tubes 100 can be adapted. When welding first shaped tubes 100 of different shapes or sizes, the appropriate first clamp 2 can be selected for installation as needed to meet the welding requirements of different pipes. Moreover, the replacement and adjustment of the first clamp 2 is simple and quick.

[0064] like Figure 2 and Figure 3 As shown, in some embodiments, the mounting base 1 may have a second sidewall 106. The second sidewall 106 is provided with a second mounting opening 103. The second mounting opening 103 communicates with the welding cavity 101. The welding apparatus includes a second clamp. The second clamp 3 is provided with a second clamping hole 301 for placing a second shaped tube 200, which can extend into the welding cavity 101 through the second clamping hole 301.

[0065] The mounting base 1 has a second mounting opening 103 on its second side wall 106. The second mounting opening 103 is used to mount the second clamp 3. The shape of the second clamping hole 301 within the second clamp 3 is adapted to the shape and size of the pipe to be welded. Correspondingly, the second clamping hole 301 clamps the second-shaped tube 200. Thus, by passing the second-shaped tube 200 through the second clamping hole 301 and embedding the second clamp 3 in the second mounting opening 103, the second clamp 3 can extend into the welding cavity 101 through the second clamping hole 301 and be brazed within the welding cavity 101.

[0066] like Figure 3 As shown, in some embodiments, the shapes of the first clamping hole 201 and the second clamping hole 301 can be different. This allows for the brazing of pipes of different shapes.

[0067] In some embodiments, multiple second clamps 3 may be provided. Multiple second clamps 3 are detachably fitted into the second mounting opening 103. Each second clamping hole 301 has a different shape.

[0068] In this way, by replacing different second clamps 3, it is possible to adapt to second shape tubes 200 of different sizes or shapes. When welding second shape tubes 200 of different shapes or sizes, the appropriate second clamp 3 can be selected for installation as needed to meet the welding requirements of different pipes. Moreover, the replacement and adjustment of the second clamp 3 is simple and quick.

[0069] like Figure 1 As shown, in some embodiments, the welding apparatus may include a heating component 4. The heating component 4 is disposed on the mounting base 1. The heating component 4 has a heating state, and by activating the heating state of the heating component 4, a suitable temperature can be provided for the brazing of the first shaped tube 100 and the second shaped tube 200. The welding joint of the first shaped tube 100 and the second shaped tube 200 is coated with a brazing filler metal below the melting point of the first shaped tube 100 and the second shaped tube 200. When the heating component 4 heats the filler metal to its melting temperature, the liquid filler metal fills the gap between the first shaped tube 100 and the second shaped tube 200, thereby joining them together.

[0070] Figure 4 for Figure 1 A cross-sectional view;

[0071] like Figure 4As shown, in some embodiments, when a first clamp 2 is fitted into the first mounting port 102 and a second clamp 3 is fitted into the second mounting port 103, the first clamp 2, the second clamp 3, and the mounting base 1 form a welding cavity 101. Thus, by fitting the first clamp 2 and the second clamp 3 together, the welding cavity 101 can be enclosed by the first clamp 2, the second clamp 3, and the mounting base 1 to form a sealed space. This not only prevents heat loss during welding and improves heat utilization efficiency, but also provides a more stable environment for welding. Within the sealed space, the welding atmosphere can be effectively controlled, avoiding adverse reactions such as oxidation.

[0072] Specifically, when the heating component 4 is heating, part of the heat generated by the heating component 4 is transferred to the welding cavity 101 through the mounting base 1, and part of the heat is transferred to the first clamp 2 and the second clamp 3 to heat the first shaped tube 100 and the second shaped tube 200.

[0073] The heating component 4 is mounted on the mounting base 1, allowing it to directly heat the mounting base 1. The heat is transferred to the welding cavity 101 through the mounting base 1. Furthermore, since the first clamp 2 and the second clamp 3 are respectively embedded in the first mounting port 102 and the second mounting port 103, the heat from the mounting base 1 can also be efficiently transferred to the first shaped tube 100 in the first clamp 2 and the second shaped tube 200 in the second clamp 3, thereby heating the first shaped tube 100, the second shaped tube 200, and the brazing filler metal coated on the surface, thus realizing the brazing process.

[0074] In this technical solution, by setting multiple first clamps 2 with first clamping holes 201 of different shapes and multiple second clamps 3 with second clamping holes 301 of different shapes, each first clamp 2 and second clamp 3 is detachably mounted on its corresponding mounting port, enabling the welding of pipe fittings of different shapes and sizes. Thus, the welding device of this application can achieve compatible welding of pipes of different shapes and sizes. Compared with the prior art, the welding device of this application has higher versatility and flexibility, and can adapt to various complex welding needs. Furthermore, it is simple to operate; only by replacing different first clamps 2 and second clamps 3 and activating the heating assembly 4 can the brazing process be achieved.

[0075] In some embodiments, the inner wall of the welding cavity 101 may be provided with an anti-oxidation layer (not shown in the figure). By providing an anti-oxidation layer on the wall of the welding cavity 101, the anti-oxidation layer can reduce the oxidation of the brazing filler metal and the materials to be brazed—the first shaped tube 100 and the second shaped tube 200—during the welding process, thereby reducing the generation of brazing oxide slag, reducing defects such as slag inclusions and porosity in the weld, and thus improving the density and strength of the weld.

[0076] In some specific embodiments, the antioxidant layer can be made of materials such as silicon carbide, alumina, or silicate glass.

[0077] In some embodiments, the first clamp 2 can be made of porous silicon carbide refractory brick. Porous silicon carbide refractory brick, due to its porous structure, has a low thermal conductivity, which slows down heat transfer to the outside of the device, thereby reducing heat loss within the welding cavity 101. Furthermore, porous silicon carbide refractory brick is a low-cost material, and by fabricating multiple first clamps 2 with different sizes and shapes of clamping holes, it can be adapted to brazing pipes of different shapes and sizes, offering a cost-effective advantage.

[0078] In some embodiments, the second clamp 3 can be made of porous silicon carbide refractory brick. Porous silicon carbide refractory brick, due to its porous structure, has a low thermal conductivity, which slows down heat transfer to the outside of the device, thereby reducing heat loss within the welding cavity 101. Furthermore, porous silicon carbide refractory brick is a low-cost material, and multiple second clamps 3 with different sizes and shapes of clamping holes can be fabricated to accommodate brazing of pipes of different shapes and sizes, offering a cost-effective advantage.

[0079] In some embodiments, the mounting base 4 may be made of a ceramic matrix composite material. The ceramic matrix composite material has high temperature resistance and a low coefficient of thermal expansion, which can reduce deformation of the mounting base 1 caused by thermal stress during the heating and welding process.

[0080] like Figure 1 As shown, in some embodiments, the welding apparatus may include a temperature sensor 6. The temperature sensor 6 may be disposed within the mounting base 1, with one end of the temperature sensor 6 extending into the welding chamber 101. The temperature sensor 6 is used to sense the temperature of the welding chamber 101. In this way, the user can control the welding process of the pipe fitting based on the temperature sensor 6 or the temperature within the welding chamber 101.

[0081] In some embodiments, the welding apparatus may include a temperature controller (not shown). The temperature controller is electrically connected to the heating assembly 4, and is capable of receiving signals from the temperature sensor 6 and controlling the heating state of the heating assembly 4. In this way, the user can obtain the temperature inside the welding chamber 101 in real time according to the temperature sensor 6, and adjust the required operating temperature according to the actual brazing process.

[0082] like Figure 1 and Figure 2As shown, in some embodiments, the heating assembly 4 may include a first heating element 41 and a second heating element 42. The first heating element 41 and the second heating element 42 may be symmetrically arranged on the upper and lower sides of the mounting base 4. The periphery of the mounting base 4 is used to mount the first clamp 2 and the second clamp 3. By symmetrically arranging the first heating element 41 and the second heating element 42 on opposite sides of the mounting base, the welding cavity 101 can be heated more evenly, and heat can be transferred to the first clamp 2 and the second clamp 3 more efficiently, so that the first shaped tube 100 and the second shaped tube 200 can be heated evenly, thereby improving the brazing effect.

[0083] like Figure 1 As shown, in some embodiments, multiple first heating elements 41 may be provided. The multiple first heating elements 41 are arranged at intervals along the top of the mounting base 4. Specifically, the multiple first heating elements 41 may be arranged at equal intervals.

[0084] like Figure 1 As shown, in some embodiments, multiple second heating elements 42 may be provided. The multiple second heating elements 42 are arranged at equal intervals above the mounting base 4. Specifically, the multiple second heating elements 42 may be arranged at equal intervals.

[0085] like Figure 4 As shown, in some embodiments, a first clamping hole 201 may be flat. The flat-shaped first clamping hole 201 is used to clamp a first-shaped tube 100 that is flat and tubular. A second clamping hole 301 may be round, and the round-shaped second clamping hole 301 is used to clamp a second-shaped tube 200 that is round and tubular.

[0086] In this method, flat tubes and round tubes can be brazed by simultaneously using a first clamp 2 with a flat first clamping hole 201 and a second clamp 3 with a round second clamping hole 301.

[0087] In existing technologies, heat exchangers can achieve higher heat exchange efficiency by employing microchannel flat tubes. While the evaporator can utilize microchannel flat tubes, the pipes connecting the compressor and evaporator are round tubes, and these pipes are typically made of different materials. Therefore, brazing is required to connect the irregularly shaped pipes of the evaporator and compressor.

[0088] In this embodiment, by using a first clamping hole 201 in the shape of a flat hole to clamp the flat tube and a second clamping hole 301 in the shape of a round hole to clamp the round tube, the flat tube and the round tube can be welded together to meet the requirements of evaporator manufacturing for use in refrigeration devices.

[0089] like Figure 1 and Figure 2As shown, in some embodiments, the mounting base 1 may have a third sidewall 107. One side of the third sidewall 107 is connected to the first sidewall 105. The other side of the third sidewall 107 is connected to the second sidewall 106. The third sidewall 107 is provided with a third mounting opening 104. The welding apparatus may include a third clamp 5. The third clamp 5 is detachably fitted into the third mounting opening 104, and the third clamp 5 is provided with a third clamping hole 501 for placing a third shaped tube 300, which can extend into the welding cavity 101 through the third clamping hole 501.

[0090] The first sidewall 105, the second sidewall 106 and the third sidewall 107 are respectively provided on different sidewalls of the mounting base 1. A third mounting port 104 is provided on the third sidewall 107 of the mounting base 1. The third mounting port 104 is used to install the third clamp 5. In this way, the three-dimensional space of the mounting base 1 can be fully utilized to set the clamp.

[0091] Specifically, since the first sidewall 105, the second sidewall 106, and the third sidewall 107 are respectively located on different sidewalls of the mounting base 1, and the two sides of the third sidewall 107 are respectively connected to the first sidewall 105 and the second sidewall 106, that is, the third sidewall 107 is set at an angle to the first sidewall 105 and the second sidewall 106, when it is necessary to weld pipes with complex shapes, such as multiple pipes intersecting or irregular structures (such as bent pipe structures), the angled clamps can more flexibly adapt to the direction of the pipes, avoid assembly difficulties caused by the limited position of the clamps, and further improve the versatility and ease of use of the welding device.

[0092] In some embodiments, multiple third clamps 5 are provided, and the shape of the third clamping hole 501 of each third clamp 5 is different. In this way, by replacing different third clamps 5, different sizes or shapes of third-shaped tubes 300 can be adapted. When welding third-shaped tubes 300 of different shapes or sizes, the appropriate third clamp 5 can be selected for installation as needed to meet the welding requirements of different pipes, and the replacement and adjustment of the third clamp 5 is simple and quick.

[0093] In some embodiments, the third clamp 5 can be made of porous silicon carbide refractory brick. Due to its porous structure, the porous silicon carbide refractory brick has a low thermal conductivity, which slows down heat transfer to the outside of the device, thereby reducing heat loss within the welding cavity 101. Furthermore, porous silicon carbide refractory brick is a low-cost material, and multiple third clamps 5 with different sizes and shapes of clamping holes can be fabricated to accommodate brazing of pipes of different shapes and sizes, offering a cost-effective advantage.

[0094] like Figure 1 and Figure 2As shown, in some embodiments, the first sidewall 105 and the second sidewall 106 may be disposed on opposite sides of the mounting base 1. The first clamp 2 and the second clamp 3 are disposed opposite to each other. The third sidewall 107 is located on the same side of the first sidewall 105 and the second sidewall 106, and is connected to the first sidewall 105 and the second sidewall 106 respectively.

[0095] Since the first sidewall 105 and the second sidewall 106 are arranged opposite each other, and the third sidewall 107 is located on the same side of both and connects them, a "U" shape can be formed between the first sidewall 105, the second sidewall 106, and the third sidewall 107. This allows for full utilization of the three-dimensional space of the mounting base 1 to arrange different clamps. Moreover, by utilizing the spatial arrangement structure of the third clamp 5 with the first clamp 2 and the second clamp 3, multi-pipe intersection structures, such as T-shaped pipes and Y-shaped pipes, can be welded, enabling the welding device to weld more irregularly shaped pipe fittings, and thus making it suitable for welding more complex pipe fittings.

[0096] Specifically, the first clamp 2 and the second clamp 3, arranged opposite to each other, can correspondingly clamp the first shaped tube 100 and the second shaped tube 200, which are straight tubes. The straight tubes can be welded using the first clamp 2 and the second clamp 3. Using the third clamp 5 located on one side of the first clamp 2 and on one side of the second clamp 3, a bent tube can be welded by using the third clamp 5 and the first clamp 2, or by using the third clamp 5 and the second clamp 3. The third shaped tube 300 can be bent and has a first extension tube and a second extension tube connected and angled. The first extension tube can be inserted into the third clamping hole 501, and the second extension tube can be arranged laterally in the welding cavity 101. In this way, the other end of the second extension tube can be welded to the first shaped tube 100 or the second shaped tube 200, thereby realizing the brazing of the bent tube.

[0097] It should be noted that the above-mentioned straight pipe refers to a tubular shape that extends along a straight line, such as a straight round pipe, a straight flat pipe, or other straight tubular shapes.

[0098] like Figure 1 and Figure 2 As shown, in some specific embodiments, the mounting base 1 can be a right quadrangular prism, for example, it can be a cuboid, a cube, etc. Thus, the first sidewall 105 and the second sidewall 106 can be arranged parallel to each other on opposite sides of the mounting base 1.

[0099] In some other embodiments, the mounting base 1 can be a columnar body of other polygons. The first sidewall 105, the second sidewall 106 and the third sidewall 107 are respectively provided on different sidewalls, and the third sidewall 107 is set at an angle to the first sidewall 105.

[0100] like Figure 1 and Figure 2 As shown, in some embodiments, the mounting base 1 may be provided with an exhaust port 104. The exhaust port 104 communicates with the welding cavity 101. Any of the first clamping hole 201, the second clamping hole 301, and the third clamping hole 501 can be used to introduce inert gas into the welding cavity 101.

[0101] Among them, one of the first clamping hole 201, the second clamping hole 301 and the third clamping hole 501 can be used as an inert gas. When any of the first clamping hole 201, the second clamping hole 301 and the third clamping hole 501 can be used to introduce inert gas into the welding cavity 101, the air in the welding cavity 101 can be discharged to the outside through the exhaust hole 104.

[0102] Specifically, two of the first clamping hole 201, the second clamping hole 301, and the third clamping hole 501 are used to clamp the pipe to be welded, and the remaining three clamping holes 201, 301, and 501 are used as channels for the introduction of inert gas (such as argon, nitrogen, etc.). This not only allows the welding cavity 101 to form a closed space, but also the introduction of inert gas can effectively isolate oxygen, prevent metal oxidation during welding, reduce oxide inclusions in the weld, and thus effectively improve the mechanical properties of the weld.

[0103] In some other embodiments, any one of the mounting base 1, the first clamp 2, the second clamp 3, and the third clamp 5 may be provided with an air inlet (not shown) communicating with the welding cavity 101. This air inlet can be used to introduce inert gas.

[0104] Figure 5 for Figure 2 A partial exploded view;

[0105] like Figure 3 and Figure 5 As shown, in some embodiments, the mounting base 1 may include a base 11 and a top cover 12. The top surface of the base 11 is recessed downwards. The peripheral sidewall of the base 11 is recessed with a first mounting opening 102 and a second mounting opening 103. The top cover 12 is removably mounted on the top surface of the base 11. A welding cavity 101 is formed between the bottom surface of the top cover 12 and the top surface of the base 11.

[0106] The base 11 has a downward-facing recessed top surface to form a welding space. When the top cover 12 is placed on the top surface of the base 11, a welding cavity 101 can be formed, with the bottom surface of the top cover 12 and the top surface of the base 11 aligned. Furthermore, the first clamp 2, the second clamp 3, and the third clamp 5 can be used to form a closed welding cavity 101. By detachably connecting the base 11 and the top cover 12, the user can remove the top cover 12 to clean debris from the welding cavity 101. Simultaneously, before brazing the first shaped tube 100, the second shaped tube 200, or the third shaped tube 300, the top cover 12 can be opened to pre-position the parts of the tubes to be brazed. For example, the connecting ends of the first shaped tube 100 and the second shaped tube 200 can be pre-connected. On the other hand, the base 11 and the top cover 12 can be manufactured separately, reducing manufacturing complexity and improving production efficiency.

[0107] Figure 6 for Figure 3 A schematic diagram of the central base; Figure 7 for Figure 3 Schematic diagram of the top cover; Figure 8 for Figure 3 A schematic diagram of the first fixture.

[0108] like Figure 6 , Figure 7 and Figure 8 As shown, in some embodiments, a first stop rib 131 may be formed between the bottom surface of the welding cavity 101 and the bottom surface of the first mounting port 102. A first stepped groove 1081 may be provided on the side of the top of the first clamp 2 away from the welding cavity 101. A first stop portion 141 may be provided on the bottom surface of the top cover 12 facing downward. The first stop portion 141 and the first stepped groove 1081 are arranged vertically opposite each other.

[0109] When the first clamp 2 is fitted into the first mounting port 102 and the top cover 12 is placed on the top surface of the base 11, the side wall of the first clamp 2 near the welding cavity 101 abuts against the first stop rib 131, and the first stop part 141 can be engaged at the first step groove 1081.

[0110] By setting the first stop rib 131 to limit the depth of the first clamp 2 embedded in the mounting base 4, the first clamp 2 can be prevented from extending excessively into the mounting base 4, thus leaving space for welding. Furthermore, the user can confirm that the first clamp 2 is properly installed by engaging the first stop part 141 into the first stepped groove 1081, improving the reliability of the welding device. Further, by arranging the first stepped groove 1081 on the top of the first clamp 2 and the first stop part 141 on the bottom surface of the top cover 12 vertically opposite each other, when the top cover 12 is closed, the first stop part 141 engages in the first stepped groove 1081, thereby limiting the mounting opening side of the first clamp 2 and preventing it from moving up and down due to vibration or external force. On the other hand, after the top cover 12 is closed, the first stop part 141 engaging in the first stepped groove 1081 further enhances the sealing of the top of the welding cavity 101, preventing external air from entering or internal gas from escaping through the first mounting opening 102, thereby improving the reliability of the brazing environment.

[0111] When the first clamp 2 is properly fitted into the first mounting port 102 and the top cover 12 is placed on the top surface of the base 11, the side wall of the first clamp 2 near the welding cavity 101 abuts against the first stop rib 131, and the first stop part 141 can be engaged at the first stepped groove 1081. This allows the inner and outer sides of the first clamp 2 to be limited, which helps the pipe to maintain a stable clamping state during the welding process and improves the reliability of the brazing process. On the other hand, the installation structure of the first clamp 2 with the top cover 12 and the base 11 allows the user to quickly complete the installation and fixation of the first clamp 2, shortening the clamping time and improving the brazing efficiency.

[0112] like Figure 6 As shown, in some embodiments, the first stop rib 131 can be a stepped structure. The plane containing the bottom surface of the welding cavity 101 is higher than the bottom surface of the first mounting opening 102, and the stepped structure is formed at the connection between the bottom surface of the welding cavity 101 and the bottom surface of the first mounting opening 102. Thus, when the first clamp 2 is inserted into the first mounting opening 102, when the bottom of the first clamp 2 near the side of the welding cavity 101 is stopped by the stepped structure, the stepped structure limits the bottom of the first clamp 2. At this time, the first clamp 2 is properly fitted into the first mounting opening 102.

[0113] Figure 9 for Figure 3 A schematic diagram of the second clamp.

[0114] like Figure 6 , Figure 7 and Figure 9As shown, in some embodiments, a second stop rib 132 may be formed between the bottom surface of the welding cavity 101 and the bottom surface of the second mounting port 103. A second stepped groove 1082 is provided on the top side of the second clamp 3 away from the welding cavity 101. A second stop portion 142 is provided on the bottom surface of the top cover 12 facing downward, and the second stop portion 142 and the second stepped groove 1082 are arranged vertically opposite each other.

[0115] When the second clamp 3 is fitted into the second mounting port 103 and the top cover 12 is placed on the top surface of the base 11, the side wall of the second clamp 3 near the welding cavity 101 abuts against the second stop rib 132, and the second stop part 142 can be engaged at the second step groove 1082.

[0116] By setting the second stop rib 132 to limit the depth of the second clamp 3 embedded in the mounting base 4, the second clamp 3 can be prevented from extending excessively into the mounting base 4, leaving space for welding. Furthermore, the user can confirm that the second clamp 3 is properly installed by engaging the second stop part 142 into the second step groove 1082, improving the reliability of the welding device. Further, by arranging the second step groove 1082 on the top of the second clamp 3 and the second stop part 142 on the bottom surface of the top cover 12 vertically opposite each other, when the top cover 12 is closed, the second stop part 142 engages in the first step groove 1081, thereby limiting the mounting opening side of the second clamp 3 and preventing it from moving up and down due to vibration or external force. On the other hand, after the top cover 12 is closed, the second stop part 142 engaging in the second step groove 1082 further enhances the sealing of the top of the welding cavity 101, preventing external air from entering or internal gas from escaping through the second mounting opening 103, thereby improving the reliability of the brazing environment.

[0117] When the second clamp 3 is properly installed in the second mounting port 103 and the top cover 12 is placed on the top surface of the base 11, the side wall of the second clamp 3 near the welding cavity 101 abuts against the second stop rib 132, and the second stop part 142 can be engaged at the second stepped groove 1082. This allows the inner and outer sides of the second clamp 3 to be limited, which helps the pipe to maintain a stable clamping state during the welding process and improves the reliability of the brazing process. On the other hand, the installation structure of the second clamp 3 with the top cover 12 and the base 11 allows the user to quickly complete the installation and fixation of the second clamp 3, shortening the clamping time and thus improving the brazing efficiency.

[0118] like Figure 6As shown, in some embodiments, the second stop rib 132 can be a stepped structure. The plane containing the bottom surface of the welding cavity 101 is higher than the bottom surface of the second mounting opening 103, and the stepped structure is formed at the connection between the bottom surface of the welding cavity 101 and the bottom surface of the second mounting opening 103. Thus, when the second clamp 3 is inserted into the second mounting opening 103, when the bottom of the second clamp 3 near the side of the welding cavity 101 is stopped by the stepped structure, the stepped structure limits the bottom of the second clamp 3. At this time, the second clamp 3 and the second mounting opening 103 are properly fitted into place.

[0119] Figure 10 for Figure 3 A schematic diagram of the third clamp.

[0120] like Figure 6 , Figure 7 and Figure 10 As shown, in some embodiments, a third stop rib 133 may be formed between the bottom surface of the welding cavity 101 and the bottom surface of the third mounting port 104. A third step groove 1083 may be provided on the top side of the third clamp 5 away from the welding cavity 101. A third stop portion 143 is provided on the bottom surface of the top cover 12 facing downward, and the third stop portion 143 and the third step groove 1083 are arranged vertically opposite each other.

[0121] When the third clamp 5 is installed in the third mounting port 104 and the top cover 12 is placed on the top surface of the base 11, the side wall of the third clamp 5 near the welding cavity 101 abuts against the third stop rib 133, and the third stop part 143 can be engaged at the third step groove 1083.

[0122] By setting a third stop rib 133 to limit the depth of the third clamp 5 embedded in the mounting base 4, the third clamp 5 can be prevented from extending excessively into the mounting base 4, leaving space for welding. Furthermore, the user can confirm that the third clamp 5 is properly installed by engaging the third stop part 143 into the third step groove 1083, improving the reliability of the welding device. Further, by arranging the third step groove 1083 on the top of the third clamp 5 and the third stop part 143 on the bottom surface of the top cover 12 vertically opposite each other, when the top cover 12 is closed, the third stop part 143 engages in the first step groove 1081, thereby limiting the mounting opening side of the third clamp 5 and preventing it from moving up and down due to vibration or external force. On the other hand, after the top cover 12 is closed, the third stop part 143 engaging in the third step groove 1083 further enhances the sealing of the top of the welding cavity 101, preventing external air from entering or internal gas from escaping through the second mounting opening 103, thereby improving the reliability of the brazing environment.

[0123] When the third clamp 5 is properly installed in the third mounting port 104 and the top cover 12 is placed on the top surface of the base 11, the side wall of the third clamp 5 near the welding cavity 101 abuts against the third stop rib 133, and the third stop part 143 can be engaged at the second and third step grooves. This allows the inner and outer sides of the third clamp 5 to be limited, which helps the pipe to maintain a stable clamping state during the welding process and improves the reliability of the brazing process. On the other hand, the installation structure of the third clamp 5 with the top cover 12 and the base 11 allows users to quickly complete the installation and fixation of the third clamp 5, shortening the clamping time and thus improving the efficiency of brazing work.

[0124] like Figure 6 As shown, in some embodiments, the third stop rib 133 can be a stepped structure. The plane containing the bottom surface of the welding cavity 101 is higher than the bottom surface of the third mounting opening 104, and the stepped structure is formed at the connection between the bottom surface of the welding cavity 101 and the bottom surface of the third mounting opening 104. Thus, when the third clamp 5 is inserted into the third mounting opening 104, when the bottom of the third clamp 5 near the side of the welding cavity 101 is stopped by the stepped structure, the stepped structure limits the bottom of the third clamp 5. At this time, the third clamp 5 and the third mounting opening 104 are properly fitted into place.

[0125] like Figure 6 As shown, in some embodiments, the first stop rib 131, the second stop rib 132 and the third stop rib 133 can be arranged sequentially around the bottom surface of the welding cavity 101.

[0126] like Figure 7 As shown, in some embodiments, the first stop 141, the second stop 142 and the third stop 143 may be arranged sequentially around the bottom surface of the top cover 12.

[0127] like Figure 6 As shown, in some embodiments, the top surface of the base 11 is provided with a first groove 1091 near the first step groove 1081 of the first clamp 2. The first groove 1091 can be understood as an extension of the first step groove 1081 on the first side wall 105, thereby adapting to the first stop rib 131 of the top cover 12.

[0128] like Figure 6 As shown, in some embodiments, a second groove 1092 is provided on the top surface of the base 11 near the second step groove 1082 of the second clamp 3. The second groove 1092 can be understood as an extension of the second step groove 1082 on the second side wall 106, thereby adapting to the second stop rib 132 of the top cover 12.

[0129] like Figure 6As shown, in some embodiments, a third groove 1093 is provided on the top surface of the base 11 near the third step groove 1083 of the third clamp 5. The third groove 1093 can be understood as an extension of the third step groove 1083 on the third side wall 107, thereby adapting to the third stop rib 133 of the top cover 12.

[0130] Figure 11 for Figure 1 A schematic diagram of the first clamp in another embodiment; Figure 12 for Figure 11 An exploded image.

[0131] like Figure 11 and Figure 12 As shown, in some embodiments, the sidewall of the first clamp 2 facing the welding cavity 101 can be a first end face 202. The sidewall of the first clamp 2 away from the welding cavity 101 can be a second end face. The two ends of the first clamping hole 201 pass through the first end face 202 and the second end face, respectively. The end of the first clamping hole 201 near the first end face 202 is a first end 2011, and the port of the first end 2011 forms a welding groove 2012. The two ends of the welding groove 2012 are respectively spaced apart from the two ends of the first clamping hole 201 in the width direction. The welding groove 2012 extends toward the hole walls on opposite sides of the first clamping hole 201 so that the second shaped tube 200 can extend into the first clamping hole 201 through the welding groove 2012.

[0132] The welding groove 2012 is formed on the side of the first clamp 2 near the welding cavity 101. By extending the welding groove 2012 toward the hole walls on both sides of the first clamping hole 201 to form a certain guiding structure, the containment structure of the welding groove 2012 is improved, so that the second shaped tube 200 can extend into the first clamping hole 201. In this way, when the first shaped tube 100 is inserted into the first clamping hole 201, under the action of the brazing filler metal, the part of the second shaped tube 200 extending into the first clamping hole 201 can be welded together with the first shaped tube 100.

[0133] It should be noted that a common problem in brazing is that the thermal expansion and contraction of metals causes a difference in expansion during the heating process, which increases the assembly gap. For example, if the initial gap between two tubes to be welded is 0.1 mm, it may expand to about 0.5 mm after heating. This means that the brazing filler metal cannot completely fill the assembly gap, resulting in leakage at the weld.

[0134] like Figure 11 and Figure 12As shown, in this embodiment, by providing a welding groove 2012 at one end of the first clamping hole 201 near the welding cavity 101, the welding position of the first shaped tube 100 and the second shaped tube 200 is within the first clamp 2. Since the shape of the first clamping hole 201 has a spatial restriction effect on the tube to be welded, the size change of the gap can be effectively reduced during the brazing process, thereby effectively improving the problem of leakage at the weld.

[0135] like Figure 12 As shown, in some embodiments, the guide structure can be "U-shaped", "C-shaped" or "V-shaped", etc. When the first shaped tube 100 is configured as a flat tube and the second shaped tube 200 is configured as a round tube, the welding groove 2012 can extend toward the hole walls on both sides of the first clamping hole 201 to form a C-shaped guide structure, thereby allowing the round tube to be inserted into the first shaped tube 100 and located in the first clamping hole 201.

[0136] In some embodiments, the first clamp 2 may be made of shape memory alloy. Before welding, the welding cavity 101 is at a low temperature, and the first clamp 2 is in a martensitic state. The martensitic state refers to the high plasticity and low stiffness of the shape memory alloy, which can clamp the portions of the first shaped tube 100 and the second shaped tube 200 that extend into the first clamping hole 201. As the brazing process heats to a high temperature, the shape memory alloy undergoes a phase transformation, changing from martensitic to austenitic. At this point, the high temperature induces austenitic phase transformation expansion in the baffle, preventing the first shaped tube 100 and the second shaped tube 200 from expanding into free space. This reduces the increase in assembly gap caused by the different expansion coefficients between different metal materials, lowers the porosity after solder solidification, and improves welding quality. Furthermore, the first clamp returns to its martensitic state, facilitating the removal of the brazed fittings from the first clamp 2.

[0137] In some specific embodiments, the shape memory alloy can be, for example, a Ni-Ti alloy or a copper-based alloy.

[0138] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of this application is limited only by the appended claims.

Claims

1. A welding apparatus, characterized in that, include: Mounting base, wherein the mounting base is provided with a welding cavity; The mounting base has a first sidewall and a second sidewall. The first sidewall is provided with a first mounting opening, and the second sidewall is provided with a second mounting opening. The first mounting opening and the second mounting opening are respectively connected to the welding cavity. Multiple first clamps are detachably fitted into the first mounting port. Each first clamp is provided with a first clamping hole. The shape of each first clamping hole is different. The first clamping hole is used to place a first shaped tube. The first shaped tube can extend into the welding cavity through the first clamping hole. Multiple second clamps are detachably fitted into the second mounting port. Each second clamp is provided with a second clamping hole. The shape of each second clamping hole is different. The second clamping hole is used to place a second shaped tube. The second shaped tube can extend into the welding cavity through the second clamping hole. A heating assembly is mounted on the mounting base; Wherein, when a first clamp is fitted into the first mounting port and a second clamp is fitted into the second mounting port, the first clamp, the second clamp, and the mounting base form the welding cavity; When the heating component heats, part of the heat generated by the heating component is transferred to the welding cavity through the mounting base, and part of the heat is transferred to the first clamp and the second clamp to heat the first shaped tube and the second shaped tube.

2. The welding apparatus according to claim 1, characterized in that, The first clamping hole is flat and is used to clamp a first-shaped tube that is flat and tubular. The second clamping hole is round and is used to clamp the second-shaped tube, which is in the shape of a round tube.

3. The welding apparatus according to claim 1, characterized in that, The mounting base has a third sidewall, one side of which is connected to the first sidewall, and the other side of which is connected to the second sidewall; the third sidewall is provided with a third mounting opening; The welding device further includes a third clamp, which is detachably fitted into the third mounting port. The third clamp is provided with a third clamping hole for placing a third shaped tube, which can extend into the welding cavity through the third clamping hole. The third clamp is provided in multiple ways, and the shape of the third clamping hole of each third clamp is different.

4. The welding apparatus according to claim 3, characterized in that, The first sidewall and the second sidewall are located on opposite sides of the mounting base. The first clamp and the second clamp are arranged opposite to each other. The third sidewall is located on the same side of the first sidewall and the second sidewall and is connected to the first sidewall and the second sidewall respectively.

5. The welding apparatus according to claim 3, characterized in that, The mounting base is provided with an exhaust hole, which communicates with the welding cavity; Any one of the first clamping hole, the second clamping hole, and the third clamping hole can be used to introduce inert gas into the welding cavity.

6. The welding apparatus according to claim 3, characterized in that, The mounting base includes: The base has a downward-facing recessed top surface and a first mounting opening and a second mounting opening recessed on its peripheral sidewall. A top cover, which is removable, is attached to the top surface of the base; The welding cavity is formed between the bottom surface of the top cover and the top surface of the base.

7. The welding apparatus according to claim 6, characterized in that, A first stop rib is formed between the bottom surface of the welding cavity and the bottom surface of the first mounting port; The top of the first fixture has a first stepped groove on the side away from the welding cavity; The bottom surface of the top cover is provided with a first stop portion protruding downwards, and the first stop portion is arranged vertically opposite to the first step groove. When the first clamp is fitted into the first mounting port and the top cover is placed on the top surface of the base, the side wall of the first clamp near the welding cavity abuts against the first stop rib, and the first stop part can be engaged with the first step groove.

8. The welding apparatus according to claim 6, characterized in that, A second stop rib is formed between the bottom surface of the welding cavity and the bottom surface of the second mounting port; The top of the second fixture has a second stepped groove on the side away from the welding cavity; The bottom surface of the top cover is provided with a second stop portion protruding downwards, and the second stop portion is arranged vertically opposite to the second step groove; When the second clamp is fitted into the second mounting port and the top cover is placed on the top surface of the base, the side wall of the second clamp near the welding cavity abuts against the second stop rib, and the second stop part can be engaged with the second step groove.

9. The welding apparatus according to claim 6, characterized in that, A third stop rib is formed between the bottom surface of the welding cavity and the bottom surface of the third mounting port; The top of the third clamp is provided with a third stepped groove on the side away from the welding cavity; The bottom surface of the top cover is provided with a third stop portion protruding downwards, and the third stop portion is arranged vertically opposite to the third step groove; When the third clamp is fitted into the third mounting port and the top cover is placed on the top surface of the base, the side wall of the third clamp near the welding cavity abuts against the third stop rib, and the third stop part can be engaged with the third step groove.

10. The welding apparatus according to claim 1, characterized in that, The sidewall of the first clamp facing the welding cavity is the first end face, and the sidewall of the first clamp away from the welding cavity is the second end face; The two ends of the first clamping hole pass through the first end face and the second end face, respectively; The end of the first clamping hole near the first end face is the first end, and the port of the first end forms a welding groove. The two ends of the welding groove are respectively spaced apart from the two ends of the first clamping hole along the width direction. The welding groove extends toward the hole walls on opposite sides of the first clamping hole so that the second shaped tube can extend into the first clamping hole through the welding groove.

Images