Welding torch

Abstract

The present application relates to a kind of welding torch, including welding torch main body and gun nozzle assembly.Welding torch main body includes first inner tube, second inner tube, inner tube joint and multiple supports, first inner tube is inserted in second inner tube, support is clamped between first inner tube and second inner tube, and cooling channel is formed between adjacent two supports.One end of inner tube joint is connected with second inner tube, and one end of first inner tube is inserted into inner tube joint, and extension channel is formed between first inner tube and inner tube joint.Gun nozzle assembly includes conducting nozzle, and one end of conducting nozzle is in abutment with inner tube joint and is communicated with first inner tube.Cooling liquid in cooling channel can be more close to conducting nozzle by extension channel, to utilize cooling liquid to conducting nozzle is cooled down and is handled.The structure is more conducive to the heat conduction of conducting nozzle to cooling liquid, to improve the heat dissipation efficiency of conducting nozzle, prolong the service life of conducting nozzle, prolong the maintenance cycle of welding torch.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, and more particularly to a welding torch. Background Technology

[0002] A welding torch is a device used in welding operations. The high current and voltage of the welding machine generate heat, which is concentrated at the torch's contact tip, melting the welding wire. The molten wire penetrates the area to be welded, and after cooling, the welded objects are firmly joined together. In related technologies, a welding torch mainly consists of a torch body and a nozzle assembly, which are detachably installed together. The torch body includes an inner tube assembly for feeding the welding wire, with cooling channels for coolant flow. The nozzle assembly includes a contact tip for feeding the welding wire, which also conducts current to the wire. Due to the current and high temperature it withstands, the contact tip is a consumable part of the welding torch and needs periodic replacement. Because the contact tip is installed relatively far from the cooling channels and close to the welding position, its heat dissipation is poor, resulting in a short lifespan and a short maintenance cycle for the welding torch. Summary of the Invention

[0003] The purpose of this invention is to provide a welding torch that can use coolant to dissipate heat from the contact tip, thereby extending the service life of the contact tip and the maintenance cycle of the welding torch.

[0004] To achieve this objective, the present invention adopts the following technical solution: A welding torch is provided, comprising a welding torch body and a nozzle assembly disposed at one end of the welding torch body. The welding torch body includes a first inner tube, a second inner tube, an inner tube connector, and a plurality of support members. The first inner tube passes through the second inner tube, and the support members are sandwiched between the first inner tube and the second inner tube. The plurality of support members are spaced apart along the circumferential direction of the first inner tube, and a cooling channel for coolant flow is formed between two adjacent support members. One end of the inner tube connector is connected to the second inner tube, and one end of the first inner tube is inserted into the inner tube connector. An extension channel communicating with the cooling channel is formed between the first inner tube and the inner tube connector. The nozzle assembly includes a conductive tip for threading welding wire, and one end of the conductive tip abuts against the inner tube connector and communicates with the first inner tube.

[0005] As a preferred embodiment of the welding torch, the first inner tube and the support member are integrally formed.

[0006] As a preferred embodiment of the welding torch, the outer wall of the inner tube connector is provided with an external thread for threaded connection with the nozzle assembly. The inner tube connector is provided with a gas guide hole for the flow of protective gas. The gas guide hole is located on the side of the external thread near the conductive nozzle. The nozzle assembly includes a gas channel for the flow of protective gas. The inner tube connector is connected to the gas channel through the gas guide hole.

[0007] As a preferred embodiment of the welding torch, a plurality of air guide holes are provided at intervals on the inner tube joint along the circumferential direction of the inner tube joint.

[0008] As a preferred embodiment of the welding torch, the nozzle assembly further includes a nozzle, a flow divider, and a conductive nozzle seat. The nozzle has a gas chamber. The flow divider is disposed inside the nozzle and has a first flow dividing hole. The conductive nozzle seat is disposed inside the flow divider. One end of the conductive nozzle seat is connected to the inner tube connector, and the other end is connected to the conductive nozzle. The conductive nozzle seat has a second flow dividing hole. A first buffer chamber is formed between the flow divider and the conductive nozzle seat. A second buffer chamber is formed between the conductive nozzle seat and the inner tube connector. The gas chamber, the first flow dividing hole, the first buffer chamber, the second flow dividing hole, and the second buffer chamber are sequentially connected to form the gas channel.

[0009] As a preferred embodiment of the welding torch, the first inner tube extends to the outside of the second inner tube at one end toward the inner tube connector, the support extends to the outside of the second inner tube at one end toward the inner tube connector, and the extension length of the first inner tube is greater than the extension length of the support.

[0010] As a preferred embodiment of the welding torch, the inner wall of the inner tube connector is provided with a first mounting step and a second mounting step at intervals, the end of the first inner tube abuts against the first mounting step, the end of the second inner tube abuts against the second mounting step, and the extension channel is located between the first mounting step and the second mounting step.

[0011] As a preferred embodiment of the welding torch, along the axial direction of the inner tube connector, the extended channel includes at least two channel segments, wherein in two adjacent channel segments, the width of the channel segment closer to the conductive nozzle is smaller than the width of the channel segment farther from the conductive nozzle.

[0012] As a preferred embodiment of the welding torch, the outer wall of the inner tube connector is flush with the outer wall of the second inner tube, and the inner tube connector is welded and fixed to the second inner tube.

[0013] As a preferred embodiment of the welding torch, four support members are evenly distributed around the periphery of the first inner tube.

[0014] The advantages of this invention compared to the prior art are: The welding torch of this invention, by incorporating multiple support members between the first and second inner tubes, enhances the structural rigidity of both tubes, allowing the cooling channel to be positioned as close as possible to the inner tube connector. The conductive nozzle abuts against the inner tube connector, facilitating direct heat transfer from the nozzle to the connector. Inserting one end of the first inner tube into the connector, and forming an extended channel between the first and second inner tubes that communicates with the cooling channel, allows the coolant in the cooling channel to approach the conductive nozzle more closely, enabling cooling of the nozzle. This structure further facilitates heat transfer from the conductive nozzle to the coolant, thereby improving the nozzle's heat dissipation efficiency, extending its lifespan, and extending the welding torch's maintenance cycle. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of a welding torch according to an embodiment of the present invention.

[0017] Figure 2 This is a partial schematic diagram of the welding torch according to an embodiment of the present invention.

[0018] Figure 3 This is an exploded view of the inner tube assembly according to an embodiment of the present invention.

[0019] Figure 4 This is a cross-sectional view of the welding torch according to an embodiment of the present invention.

[0020] Figure 5 This is a partial cross-sectional view of the welding torch according to an embodiment of the present invention.

[0021] Figure 6 This is a cross-sectional view of the inner tube assembly according to an embodiment of the present invention.

[0022] Figure 7 This is a cross-sectional view of the inner tube connector according to an embodiment of the present invention.

[0023] Figure 8 This is a schematic diagram of a shunt according to an embodiment of the present invention.

[0024] Figure 9 This is a schematic diagram of the conductive nozzle holder according to an embodiment of the present invention.

[0025] In the picture: 1. Welding torch body; 11. First inner tube; 110. Gas passage; 12. Second inner tube; 121. Main tube section; 122. Insert tube section; 13. Inner tube connector; 131. First mounting step; 132. Second mounting step; 133. Extension channel; 134. External thread; 135. Gas guide hole; 136. First tube section; 137. Second tube section; 138a. Third tube section; 138b. Fourth tube section; 139. Fifth tube section; 14. Support component; 15. Cooling channel; 16. Outer tube assembly; 161. 1. Heat dissipation channel; 162. Fixing base; 17. Quick connector; 2. Nozzle assembly; 21. Nozzle; 210. Gas chamber; 211. Buffer groove; 212. Gas outlet; 22. Diverter; 221. Positioning protrusion ring; 222. First limiting part; 223. Second limiting part; 224. First diverting hole; 23. Conductive nozzle; 231. Guide wire hole; 24. Conductive nozzle seat; 241. Second diverting hole; 242. Limiting step; 243. Clamping surface; 25. First buffer cavity; 26. Second buffer cavity; 3. Welding wire. Detailed Implementation

[0026] The advantages and features of the present invention, as well as methods of implementing them, will become apparent from the following detailed description of the embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms. These embodiments are provided merely to complete the disclosure of the invention and to enable those skilled in the art to fully understand the scope of the invention, which is defined only by the scope of the claims. The same reference numerals denote the same constituent elements throughout the specification.

[0027] The present invention will now be described in detail with reference to the accompanying drawings.

[0028] like Figure 1 , Figure 3 and Figure 6As shown, the present invention provides a welding torch, including a welding torch body 1 and a nozzle assembly 2. The nozzle assembly 2 is disposed at one end of the welding torch body 1, and is detachably connected to the welding torch body 1 by a threaded connection, so as to facilitate the removal of the nozzle assembly 2 from the welding torch body 1 for maintenance of some components of the nozzle assembly 2. The welding torch body 1 includes a first inner tube 11, a second inner tube 12, an inner tube connector 13, and a plurality of support members 14. The first inner tube 11 and the second inner tube 12 are both circular tubes. The first inner tube 11 passes through the second inner tube 12, and the two are coaxial. The support members 14 are sandwiched between the first inner tube 11 and the second inner tube 12, and the plurality of support members 14 are spaced apart along the circumferential direction of the first inner tube 11. The support members 14 are used to separate the cavity located between the first inner tube 11 and the second inner tube 12. A cooling channel 15 is formed between two adjacent support members 14, and the cooling channel 15 is for the flow of coolant to cool the welding torch body 1. The inner tube connector 13 is used to connect the first inner tube 11 and the second inner tube 12 together, and to install and fix it to the nozzle assembly 2. The inner tube connector 13 has a tubular structure, with one end connected to the second inner tube 12 and one end of the first inner tube 11 inserted into the inner tube connector 13. The first inner tube 11 communicates with the inner tube connector 13. An extension channel 133 is formed between the first inner tube 11 and the inner tube connector 13, with one end of the extension channel 133 communicating with the cooling channel 15 so that the coolant in the cooling channel 15 can flow into the extension channel 133. The nozzle assembly 2 includes a conductive tip 23 for threading the welding wire 3. One end of the conductive tip 23 abuts against the inner tube connector 13, and the conductive tip 23 communicates with the first inner tube 11. The welding wire 3 in the first inner tube 11 can be delivered to the conductive tip 23, and finally the welding wire 3 is led out from the conductive tip 23 to the welding position.

[0029] It is understandable that by providing multiple support members 14 between the first inner tube 11 and the second inner tube 12, the structural rigidity of the first inner tube 11 and the second inner tube 12 is improved, allowing the cooling channel 15 to be as close as possible to the inner tube connector 13. By setting the conductive nozzle 23 to abut against the inner tube connector 13, the heat from the conductive nozzle 23 is directly conducted to the inner tube connector 13. By inserting one end of the first inner tube 11 into the inner tube connector 13 and forming an extended channel 133 communicating with the cooling channel 15 between the first inner tube 11 and the inner tube connector 13, the coolant in the cooling channel 15 can be brought closer to the conductive nozzle 23 through the extended channel 133, thus utilizing the coolant to cool the conductive nozzle 23. This structure further facilitates the transfer of heat from the conductive nozzle 23 to the coolant, thereby improving the heat dissipation efficiency of the conductive nozzle 23, extending its service life, and extending the maintenance cycle of the welding torch.

[0030] Specifically, refer to Figure 4 and Figure 6As shown, the welding torch body 1 includes an inner tube assembly, an outer tube assembly 16, and a quick connector 17. The inner tube assembly consists of a first inner tube 11, a second inner tube 12, an inner tube connector 13, and a support member 14. The inner tube assembly has a cooling channel 15 for coolant flow. The outer tube assembly 16 has a similar structure to the inner tube assembly, also a double-layer tube structure, and has a heat dissipation channel 161 for coolant flow. The outer tube assembly 16 includes a first outer tube, a second outer tube, and a fixing seat 162. The first outer tube passes through the second outer tube, and the fixing seat 162 is located at the end of the first and second outer tubes facing the nozzle assembly 2, for connection and fixation to the nozzle assembly 2. During welding operations, the coolant in the cooling channel 15 and the heat dissipation channel 161 cools the entire welding torch. The quick connector 17 is located at the end of the inner tube assembly and the outer tube assembly 16 away from the nozzle assembly 2. The quick connector 17 is used to connect to the pipeline of the welding machine to achieve a quick connection between the welding torch and the welding machine.

[0031] Specifically, refer to Figure 3 and Figure 4 As shown, the inner tube connector 13 is used for installation and fixation with the nozzle assembly 2. An external thread 134 is provided on the outer wall of the inner tube connector 13, allowing the inner tube connector 13 to be threadedly connected to the nozzle assembly 2 via the external thread 134. A gas guide hole 135 is provided on the inner tube connector 13, with its two ends penetrating the inner and outer walls of the inner tube connector 13 respectively, allowing the shielding gas to flow through. The nozzle assembly 2 includes a gas channel for the shielding gas to flow through, and the inner tube connector 13 communicates with the gas channel through the gas guide hole 135. A gas passage 110 is formed inside the first inner tube 11, used to transport the welding wire 3 and the shielding gas. One end of the first inner tube 11 is inserted into the inner tube connector 13, connecting the gas passage 110 to the inner tube connector 13. The shielding gas can flow from the gas passage 110 into the inner tube connector 13, and then through the gas guide hole 135 into the gas channel of the nozzle assembly 2. The air vent 135 is located on the side of the external thread 134 near the conductive nozzle 23. Since the position of the air vent 135 needs to be spaced apart from the position of the extension channel 133, the position of the air vent 135 should be located as close as possible to the end of the inner tube connector 13, so that the extension channel 133 can be closer to the conductive nozzle 23, thereby improving the heat dissipation efficiency of the conductive nozzle 23.

[0032] To ensure the uniformity of the protective gas flow into the nozzle assembly 2, multiple air guide holes 135 are provided, and the multiple air guide holes 135 are evenly distributed along the circumferential direction of the inner tube connector 13.

[0033] The first inner tube 11 passes through the second inner tube 12, with one end of the first inner tube 11 extending towards the inner tube connector 13 to the outside of the second inner tube 12. This structure allows the first inner tube 11 to be inserted into the inner tube connector 13 while the end of the inner tube connector 13 is connected to the second inner tube 12. Four support members 14 are provided, evenly spaced along the circumference of the first inner tube 11. By providing four support members 14, effective support can be formed around the second inner tube 12, thereby ensuring the structural rigidity of the second inner tube 12. Of course, in other embodiments, the support members 14 can also be three, five, or six, etc. It should be noted that the more support members 14 there are, the denser their distribution, and the better the support effect on the first inner tube 11 and the second inner tube 12. The fewer support members 14 there are, the less space is occupied in the gap between the first inner tube 11 and the second inner tube 12, the more coolant can be contained in the inner tube assembly, and the better the cooling effect. The support member 14 and the first inner tube 11 are integrally formed. During processing, cooling channels 15 can be directly machined on the outer wall of the tube material to form the first inner tube 11 and the support member 14. The end of the support member 14 facing the inner tube connector 13 extends to the outside of the second inner tube 12, so that the support member 14 can be inserted into the interior of the inner tube connector 13. The extension length of the first inner tube 11 is greater than the extension length of the support member 14. The extension length of the first inner tube 11 is the distance between the end face of the first inner tube 11 near the inner tube connector 13 and the end face of the second inner tube 12 near the inner tube connector 13. The extension length of the support member 14 is the distance between the end face of the support member 14 near the inner tube connector 13 and the end face of the second inner tube 12 near the inner tube connector 13. The extension length of the first inner tube 11 is greater than the extension length of the support member 14, which can reduce the space occupied by the support member 14 in the inner tube joint 13. This is beneficial to increase the wall thickness of the inner tube joint 13 near the conductive nozzle 23, providing sufficient space for the processing of the external thread 134.

[0034] Specifically, refer to Figure 6 and Figure 7As shown, the inner wall of the inner tube connector 13 is provided with a first mounting step 131 and a second mounting step 132 at intervals. The first mounting step 131 is located on the side of the inner tube connector 13 near the conductive nozzle 23, and the second mounting step 132 is located on the side of the inner tube connector 13 near the second inner tube 12. The end of the first inner tube 11 abuts against the first mounting step 131, and the end of the second inner tube 12 abuts against the second mounting step 132. An extension channel 133 is located between the first mounting step 131 and the second mounting step 132. In order to ensure that the extension channel 133 can be as close as possible to the conductive nozzle 23 while ensuring the structural rigidity of the inner tube connector 13, the extension channel 133 includes at least two channel segments. All channel segments are connected sequentially along the axial direction of the inner tube connector 13. In two adjacent channel segments, the width of the channel segment on the side closer to the conductive nozzle 23 is smaller than the width of the channel segment on the side farther from the conductive nozzle 23. It is understood that the extension channel 133 is the cavity portion located between the inner wall of the inner tube connector 13 and the outer wall of the first inner tube 11, meaning that the cross-section of the extension channel 133 is annular. The width of the channel segment is the corresponding annular width. The larger the width of the channel segment, the smaller the wall thickness of the corresponding area of ​​the inner tube connector 13. Conversely, the smaller the width of the channel segment, the larger the wall thickness of the corresponding area of ​​the inner tube connector 13. Since an extension channel 133 is provided between the first inner tube 11 and the inner tube connector 13, and there is no support member 14 in the extension channel 133, the structural rigidity of the area corresponding to the extension channel 133 on the first inner tube 11 and the inner tube connector 13 needs to be provided by the material itself. Therefore, by setting the wall thickness of the channel segment area on the side closer to the conductive nozzle 23 to be relatively larger, and setting the wall thickness of the channel segment area on the side farther from the conductive nozzle 23 to be relatively smaller, not only can the extension channel 133 be made closer to the conductive nozzle 23 as a whole, but the extension channel 133 can also accommodate more coolant and ensure the structural rigidity of the inner tube connector 13.

[0035] The inner wall of the inner tube connector 13 is configured with a multi-segment stepped structure. The inner tube connector 13 includes a first tube segment 136, a second tube segment 137, a third tube segment 138a, a fourth tube segment 138b, and a fifth tube segment 139 connected sequentially along its axial direction. The first tube segment 136 is used to abut against the conductive nozzle 23, and the fifth tube segment 139 is used to connect with the second inner tube 12. From the first tube segment 136 to the fifth tube segment 139, the inner diameter of each tube segment gradually increases. Specifically, the junction of the inner wall of the first tube segment 136 and the inner wall of the second tube segment 137 forms a first mounting step 131, and the junction of the inner wall of the fourth tube segment 138b and the inner wall of the fifth tube segment 139 forms a second mounting step 132. A vent hole 135 is provided on the first tube segment 136. External threads 134 are provided on the outer walls of the second tube segment 137 and the third tube segment 138a. The first inner tube 11 is inserted and fixed to the second tube segment 137, with the end face of the first inner tube 11 abutting against the first mounting step 131. At this time, an extension channel 133 is formed between the inner walls of the third tube segment 138a and the fourth tube segment 138b and the first inner tube 11. A channel segment is formed between the third tube segment 138a and the first inner tube 11, and a channel segment is formed between the fourth tube segment 138b and the first inner tube 11, with the width of the channel segment corresponding to the third tube segment 138a being smaller than the width of the channel segment corresponding to the fourth tube segment 138b. The support member 14 is inserted into the fourth tube segment 138b, and the support member 14 is spaced apart from the third tube segment 138a. This structure allows a portion of the inner cavity of the fourth tube segment 138b to be used as the extension channel 133.

[0036] Specifically, refer to Figure 3 and Figure 7 As shown, to improve the sealing performance of the connection between the inner tube connector 13 and the second inner tube 12, the end of the second inner tube 12 is machined with a stepped structure. This stepped structure is formed by machining the outer diameter of the end of the second inner tube 12. It can be understood that the second inner tube 12 includes a main tube section 121 and a connector section 122, with the connector section 122 located at the end of the main tube section 121 facing the inner tube connector 13. The connector section 122 has the same inner diameter as the main tube section 121, but its outer diameter is smaller than that of the main tube section 121. During connection, the connector section 122 is inserted into the fifth tube section 139, and its end face abuts against the step between the fourth tube section 138b and the fifth tube section 139. The end of the main tube section 121 is connected to the end of the fifth tube section 139, and the two are welded together. To make the outer surface of the entire inner tube assembly smoother, the outer wall of the inner tube connector 13 is flush with the outer wall of the second inner tube 12.

[0037] Specifically, refer to Figure 1 , Figure 4 and Figure 5As shown, the nozzle assembly 2 includes a nozzle 21, a distributor 22, a conductive nozzle 23, and a conductive nozzle seat 24. The nozzle 21 has a gas chamber 210. One end of the nozzle 21 is threadedly connected to the welding torch body 1, and the other end forms a gas outlet 212, which communicates with the gas chamber 210. The distributor 22 is located inside the nozzle 21, and the conductive nozzle seat 24 is located inside the distributor 22. The conductive nozzle seat 24 is used to connect the conductive nozzle 23 and the inner tube assembly. One end of the conductive nozzle seat 24 is threadedly connected to the inner tube connector 13, and the other end is threadedly connected to the conductive nozzle 23. A first buffer chamber 25 is formed between the distributor 22 and the conductive nozzle seat 24, and a second buffer chamber 26 is formed between the conductive nozzle seat 24 and the inner tube connector 13. The distributor 22 has a first diversion hole 224, and both ends of the first diversion hole 224 communicate with the gas chamber 210 and the first buffer chamber 25, respectively. The conductive nozzle seat 24 is provided with a second diversion hole 241, the two ends of which are connected to the first buffer chamber 25 and the second buffer chamber 26, respectively. The gas guide hole 135 on the inner tube connector 13 is connected to the second buffer chamber 26. The gas chamber 210, the first diversion hole 224, the first buffer chamber 25, the second diversion hole 241, and the second buffer chamber 26 are sequentially connected to form a gas channel. During welding, the protective gas in the gas channel 110 enters the gas channel through the gas guide hole 135. The protective gas flows sequentially through the second buffer chamber 26, the second diversion hole 241, the first buffer chamber 25, the first diversion hole 224, and the gas chamber 210 to the gas outlet 212. Finally, the protective gas is sprayed onto the welding area through the gas outlet 212.

[0038] Specifically, refer to Figure 4 As shown, the nozzle 21 has an overall cylindrical structure. One end of the nozzle 21 has an internal thread, through which it is threaded to the mounting base 162. The end of the nozzle 21 facing away from the mounting base 162 forms a gas outlet 212. The inner cavity of the nozzle 21 forms a gas chamber 210. A buffer groove 211 is recessed on the side wall of the gas chamber 210. The buffer groove 211 buffers the protective gas, and allows spatter generated during welding to deposit within it, reducing the risk of the gas passage being blocked by spatter.

[0039] Specifically, refer to Figure 4 , Figure 5 and Figure 8As shown, the diverter 22 has an overall cylindrical structure. It is installed inside the nozzle 21 and is coaxial with it. The diverter 22 includes a cylindrical body, a positioning protrusion 221, a first limiting part 222, and a second limiting part 223. The cylindrical body, positioning protrusion 221, first limiting part 222, and second limiting part 223 are integrally formed. A first diverting hole 224 is provided on the cylindrical body to allow communication between the inside and outside of the cylindrical body. The positioning protrusion 221 is located on the outer wall of the cylindrical body and serves to position the diverter 22 during installation. When installing the diverter 22, the positioning protrusion 221 abuts against the inner wall of the nozzle 21 and against the fixing seat 162 to achieve installation positioning. Along the axial direction of the distributor 22, a first limiting part 222 and a second limiting part 223 are spaced apart on the inner wall of the cylinder, and the free ends of both the first limiting part 222 and the second limiting part 223 extend toward the centerline of the cylinder. The first limiting part 222 and the second limiting part 223 both serve a positioning function during installation. The first limiting part 222 is used to abut against the conductive nozzle seat 24, and the second limiting part 223 is used to abut against the welding torch body 1.

[0040] The distributor 22 is provided with a plurality of first diversion holes 224, which are spaced apart along the circumference of the distributor 22. The distribution of the first diversion holes 224 should be uniform so that the protective gas discharged from the distributor 22 can enter the gas chamber 210 evenly. To facilitate the arrangement of a larger number of first diversion holes 224, all the first diversion holes 224 are arranged in two groups, each group including a plurality of first diversion holes 224. The two groups of first diversion holes 224 are arranged sequentially along the axial direction of the distributor 22, and the two groups of first diversion holes 224 are staggered. This structure is beneficial for increasing the number of first diversion holes 224 and for making the first diversion holes 224 evenly distributed around the periphery of the distributor 22.

[0041] The inner wall of the diverter 22 and / or the outer wall of the conductive nozzle seat 24 are provided with grooves, and the space corresponding to the grooves forms the first buffer cavity 25. In practical applications, the grooves can be provided on the inner wall of the diverter 22, that is, the grooves and the outer wall of the conductive nozzle seat 24 form the first buffer cavity 25. Alternatively, the grooves can be provided on the outer wall of the conductive nozzle seat 24, that is, the grooves and the inner wall of the diverter 22 form the first buffer cavity 25. Alternatively, grooves can be provided on both the inside of the diverter 22 and the outer wall of the conductive nozzle seat 24, and the two grooves form the first buffer cavity 25.

[0042] Specifically, refer to Figure 4 , Figure 5 and Figure 9As shown, the conductive nozzle seat 24 has an overall cylindrical structure. It is installed inside the distributor 22 and is coaxial with it. Along the axial direction of the conductive nozzle seat 24, one end is threaded to the inner tube connector 13. Correspondingly, the inner wall of the conductive nozzle seat 24 has an internal thread that mates with the external thread 134 of the inner tube connector 13. The other end of the conductive nozzle seat 24 is threaded to the conductive nozzle 23. Correspondingly, the inner wall of the conductive nozzle seat 24 has an internal thread for connecting to the conductive nozzle 23. A limiting step 242 is provided on the outer surface of the conductive nozzle seat 24, abutting against the first limiting part 222. The first limiting part 222 and the limiting step 242 limit the installation position between the distributor 22 and the conductive nozzle seat 24. The interior and exterior of the conductive nozzle seat 24 are connected through a second diversion hole 241. Multiple second diversion holes 241 are provided, spaced apart along the circumference of the conductive nozzle seat 24, and their distribution must be uniform. By providing multiple second diversion holes 241, protective gas can enter the first buffer chamber 25 through these holes, thereby making the gas flow rate within the first buffer chamber 25 more uniform.

[0043] The inner surface of the conductive nozzle seat 24 is provided with a groove, the depth of which extends radially along the conductive nozzle seat 24, and the groove opening faces the inner tube connector 13. The groove and the inner tube connector 13 form a second buffer cavity 26. The vent hole 135 on the inner tube connector 13 is directly connected to the second buffer cavity 26. During welding, the shielding gas in the gas passage 110 flows into the gas chamber 210 of the nozzle 21 through the vent hole 135, the second buffer cavity 26, the second diversion hole 241, the first buffer cavity 25, and the first diversion hole 224 in sequence, and finally the shielding gas is ejected from the gas outlet 212. It can be understood that during the welding operation, the shielding gas can undergo a first buffering treatment in the second buffer cavity 26, a second buffering treatment in the first buffer cavity 25, and a third buffering treatment in the gas chamber 210 of the nozzle 21, thereby enabling the shielding gas to receive sufficient buffering and deceleration, allowing the shielding gas to be ejected more evenly from the gas outlet 212. Due to the presence of the first buffer chamber 25 and the second buffer chamber 26, even if there is some overlap between the gas guide hole 135 and the second diversion hole 241 when installing the welding torch, the degree of gas flow rate unevenness can be reduced, thus promoting the uniformity of the protective gas ejection as a whole.

[0044] To facilitate the installation of the conductive nozzle holder 24, at least two clamping surfaces 243 are provided at the end of the conductive nozzle holder 24 near the gas outlet 212, so that the conductive nozzle holder 24 can be rotated by clamping the clamping surfaces 243 with a wrench. The clamping surfaces 243 can be two, four, or six.

[0045] Specifically, refer to Figure 2 and Figure 4As shown, the conductive nozzle 23 is used to guide the welding wire 3 and conduct current to the welding wire 3. The conductive nozzle 23 is threadedly connected to the conductive nozzle seat 24, with one end of the conductive nozzle 23 inserted into the conductive nozzle seat 24 and threadedly connected to it. The outer wall of the conductive nozzle 23 and the inner wall of the conductive nozzle seat 24 are provided with mutually mating stepped structures to limit the installation position between the conductive nozzle 23 and the conductive nozzle seat 24. The end face of the conductive nozzle 23 directly abuts against the inner tube connector 13, so that the heat generated by the conductive nozzle 23 can be directly conducted to the inner tube assembly, facilitating heat dissipation of the conductive nozzle 23. The conductive nozzle 23 is made of copper or a copper alloy. The conductive nozzle 23, the conductive nozzle seat 24, and the inner tube assembly are electrically connected. A guide wire hole 231 for threading the welding wire 3 is formed inside the conductive nozzle 23, and the guide wire hole 231 communicates with the air passage 110 in the first inner tube 11 through the inner tube connector 13. The welding wire 3 is fed toward the outside of the welding gun through the gas channel 110 and the wire guide hole 231 in sequence.

[0046] In this embodiment, the welding torch operates as follows: the welding wire 3 passes sequentially through the gas channel 110 and the wire guide hole 231, and is led out from the gas outlet 212 of the nozzle 21. The shielding gas flows sequentially through the gas channel 110, the gas guide hole 135, the second buffer chamber 26, the second diversion hole 241, the first buffer chamber 25, the first diversion hole 224, and the gas chamber 210, and is finally ejected through the gas outlet 212. The shielding gas undergoes a first buffering after entering the second buffer chamber 26, a second buffering after entering the first buffer chamber 25, and a third buffering after entering the gas chamber 210. Finally, the shielding gas is evenly ejected from the gas outlet 212 and used to cover the weld pool. The spatter generated during welding enters the gas chamber 210 and can be deposited in the buffer tank 211, which temporarily collects the spatter deposits. During welding, the heat generated by the conductive nozzle 23 is directly conducted to the inner tube joint 13. The coolant in the cooling channel 15 and the extension channel 133 absorbs the heat energy to achieve the cooling treatment of the conductive nozzle 23.

[0047] The beneficial effects of this embodiment are as follows: By providing multiple support members 14 between the first inner tube 11 and the second inner tube 12, the structural rigidity of the first inner tube 11 and the second inner tube 12 is improved, allowing the cooling channel 15 to be as close as possible to the inner tube joint 13. By setting the conductive nozzle 23 to abut against the inner tube joint 13, the heat of the conductive nozzle 23 can be directly conducted to the inner tube joint 13. By inserting one end of the first inner tube 11 into the inner tube joint 13 and forming an extended channel 133 communicating with the cooling channel 15 between the first inner tube 11 and the inner tube joint 13, the coolant in the cooling channel 15 can be brought closer to the conductive nozzle 23 through the extended channel 133, thereby utilizing the coolant to cool the conductive nozzle 23. This structure is more conducive to the heat transfer of the conductive nozzle 23 to the coolant, thereby improving the heat dissipation efficiency of the conductive nozzle 23, extending the service life of the conductive nozzle 23, and extending the maintenance cycle of the welding torch.

[0048] Although embodiments of the invention have been described above with reference to the accompanying drawings, the invention is not limited to the above embodiments, but can be made in various forms, and those skilled in the art will understand that the invention can be implemented in other specific forms without changing the technical spirit or essential characteristics of the invention. Therefore, it should be understood that the above embodiments are exemplary in all respects and not restrictive.

Claims

1. A welding torch, characterized in that, The welding torch includes a welding torch body and a nozzle assembly disposed at one end of the welding torch body. The welding torch body includes a first inner tube, a second inner tube, an inner tube connector, and multiple support members. The first inner tube passes through the second inner tube, and the support members are sandwiched between the first inner tube and the second inner tube. The multiple support members are distributed at intervals along the circumference of the first inner tube, and a cooling channel for coolant flow is formed between two adjacent support members. One end of the inner tube connector is connected to the second inner tube, and one end of the first inner tube is inserted into the inner tube connector. An extension channel communicating with the cooling channel is formed between the first inner tube and the inner tube connector. The nozzle assembly includes a conductive tip for threading welding wire. One end of the conductive tip abuts against the inner tube connector and communicates with the first inner tube.

2. The welding torch according to claim 1, characterized in that, The first inner tube and the support member are integrally formed.

3. The welding torch according to claim 1, characterized in that, The outer wall of the inner tube connector is provided with an external thread for threaded connection with the nozzle assembly. The inner tube connector is provided with a gas guide hole for the flow of protective gas. The gas guide hole is located on the side of the external thread close to the conductive nozzle. The nozzle assembly includes a gas channel for the flow of protective gas. The inner tube connector is connected to the gas channel through the gas guide hole.

4. The welding torch according to claim 3, characterized in that, Along the circumferential direction of the inner tube joint, a plurality of air guide holes are provided at intervals on the inner tube joint.

5. The welding torch according to claim 3, characterized in that, The nozzle assembly further includes a nozzle, a flow divider, and a conductive nozzle seat. The nozzle has a gas chamber. The flow divider is disposed inside the nozzle and has a first flow divider hole. The conductive nozzle seat is disposed inside the flow divider. One end of the conductive nozzle seat is connected to the inner tube connector, and the other end is connected to the conductive nozzle. The conductive nozzle seat has a second flow divider hole. A first buffer chamber is formed between the flow divider and the conductive nozzle seat. A second buffer chamber is formed between the conductive nozzle seat and the inner tube connector. The gas chamber, the first flow divider hole, the first buffer chamber, the second flow divider hole, and the second buffer chamber are sequentially connected to form the gas channel.

6. The welding torch according to claim 1, characterized in that, The first inner tube extends from one end toward the inner tube connector to the outside of the second inner tube, and the support extends from one end toward the inner tube connector to the outside of the second inner tube, with the extension length of the first inner tube being greater than the extension length of the support.

7. The welding torch according to claim 6, characterized in that, The inner wall of the inner tube joint is provided with a first mounting step and a second mounting step at intervals. The end of the first inner tube abuts against the first mounting step, and the end of the second inner tube abuts against the second mounting step. The extension channel is located between the first mounting step and the second mounting step.

8. The welding torch according to claim 7, characterized in that, Along the axial direction of the inner tube connector, the extended channel includes at least two channel segments, wherein the width of the channel segment closer to the conductive nozzle is smaller than the width of the channel segment farther from the conductive nozzle in two adjacent channel segments.

9. The welding torch according to claim 7, characterized in that, The outer wall of the inner tube joint is flush with the outer wall of the second inner tube, and the inner tube joint is welded and fixed to the second inner tube.

10. The welding torch according to any one of claims 1 to 9, characterized in that, The first inner tube has four support members evenly distributed around its periphery.

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