Water cooling structure and welding gun

Abstract

The utility model discloses a water cooling structure and a welding gun in the field of cooling, and the cooling structure comprises a water cooling sleeve which is sleeved on the periphery of a cooled structure; the water cooling jacket comprises an inner layer, a water cooling layer and an outer layer from inside to outside; a plurality of first water inlet channels which are connected end to end but not communicated are formed in the water cooling layer along the periphery of the inner layer; the water cooling layer is further provided with a plurality of first water return channels and a plurality of second water channels along the periphery of the first water inlet channel. The first water return channel is used for collecting return water after inlet water is conveyed to the other end of the water-cooled jacket along the first water inlet channel; and the second water channel is used for conveying cooling water of other cooled structures. The utility model solves the problems that a plurality of independent water-cooling structures are complicated to operate, the cost is increased and the resources are wasted.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling, in particular to a water cooling structure and a welding torch. Background Art

[0002] The water-cooled welding torch transports a coolant (usually water or a special coolant) to the heat-generating parts inside the welding torch, such as the gun neck or the conductive part, through a water circulation system, absorbs and takes away the heat generated during the welding process, thereby achieving an efficient heat dissipation effect. This cooling method is more effective than air cooling because the heat conduction efficiency of water is much higher than that of air. The water-cooled structure of the welding torch has multiple functions such as efficient heat dissipation, improved welding quality, extended equipment life, improved work efficiency, energy conservation and environmental protection during the welding process. Therefore, in occasions where high current welding or long-time operation is required, the water-cooled welding torch becomes an indispensable important device.

[0003] The biggest feature of the existing dual-power double-wire welding torch different from the traditional welding torch is that two independent welding power sources cooperate to control two welding wires in the same welding torch for cooperative welding to improve efficiency. Among them, the water cooling is that the two gun barrels are independently connected to the water circuit for cooling, and at the same time, the nozzle needs to be cooled by a separate water circuit. These three water cooling circuits require three sets of independent water cooling structures and water tanks for water supply circulation, which will bring disadvantages such as complex operation, increased cost, waste of resources, reduced reliability and large floor area. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model: Multiple independent water cooling structures lead to complex operation, increased cost and waste of resources.

[0005] To solve the above technical problem, the utility model provides a water cooling structure, including a water cooling sleeve sleeved on the outer periphery of the structure to be cooled; the water cooling sleeve includes an inner layer, a water cooling layer and an outer layer from the inside to the outside, and a plurality of first water inlet channels that are connected end to end but not communicated are arranged along the outer periphery of the inner layer in the water cooling layer; a plurality of first water return channels and a plurality of second channels are further arranged along the outer periphery of the first water inlet channels in the water cooling layer; the first water return channels are used to collect the return water after the inlet water is transported to the other end of the water cooling sleeve along the first water inlet channels; the second channels are used to transport the cooling water of other structures to be cooled.

[0006] For the foregoing water cooling structure, the first water inlet channels are respectively bent and communicated with both ends of the water cooling sleeve; the first water return channels are straight-through channels.

[0007] For the foregoing water cooling structure, the bent connection of the first water inlet channels includes spiral winding and connection with both ends of the water cooling sleeve.

[0008] For the foregoing water-cooling structure, when there are multiple first water inlet channels, the first water inlet channels have the same shape and size and are evenly arranged on the outer periphery of the inner layer; the first water return channel and the second channel are strip-shaped structures, and the first water return channel and the second channel are adapted to the spatial structure between the outer periphery of the first water inlet channel and the outer layer.

[0009] For the foregoing water-cooling structure, the water-cooling jacket is manufactured by 3D printing.

[0010] For the foregoing water-cooling structure, it further includes a water distribution block, and the water distribution block includes a total water inlet and a total water return; the water distribution block is respectively connected to a plurality of water-cooling jackets through pipelines; the water distribution block is used to distribute the inlet water of the total water inlet to each water-cooling jacket through pipelines, and collect the return water of each water-cooling jacket through pipelines to the total water return for discharge.

[0011] For the foregoing water-cooling structure, the total water inlet is divided into a first water inlet branch pipe and a second water inlet branch pipe through the pipeline of the water distribution block; the total water return is divided into a first water return branch pipe and a second water return branch pipe through the pipeline of the water distribution block; the water distribution block controls the water flow rate of the pipeline through the change of the pipeline diameter, wherein the pipeline cross-sectional dimension of the first water inlet branch pipe is twice that of the second water inlet branch pipe; the pipeline cross-sectional dimension of the first water return branch pipe is twice that of the second water return branch pipe.

[0012] In a second aspect, the present utility model provides a welding torch, which includes a gun barrel and a gunstock, and further includes the water-cooling jacket and the water distribution block described in the first aspect. The water-cooling jackets form the gun barrel. The water-cooling jackets are tube-shaped structures adapted to the structure of the welding torch, and the water distribution block is fixedly connected to the gunstock by screws.

[0013] For the foregoing welding torch, the gun barrel is a double-barrel gun barrel, and two water-cooling jackets form the gun barrel. The water-cooling jackets are respectively connected to the water distribution block through pipelines.

[0014] For the foregoing welding torch, it further includes a nozzle. The second channels of the two water-cooling jackets are respectively used to convey the inlet water and the return water for cooling the nozzle.

[0015] The beneficial effects achieved by the present utility model:

[0016] In the present utility model, the first water inlet channels of the water-cooling jacket are annularly arranged on the outer periphery of the structure to be cooled. The first water return channel and the second channel are annularly arranged on the outer periphery of the first water inlet channel. The first water inlet channel and the first water return channel are used to complete the cooling of the current structure to be cooled, and the second channel is used for the cooling of other structures to be cooled. By means of the layered annular arrangement, a plurality of water-cooling components of a plurality of water-cooling structures are integrated into one water-cooling jacket, so that the water-cooling jacket can cool the structure or substance wrapped by the inner layer and the water-cooling jacket itself, and can provide cooling water for other structures to be cooled. The structure is compact and the cost is saved. It solves the problems of complex operation, increased cost and waste of resources caused by multiple independent water-cooling structures.

[0017] The utility model adopts a bent first water inlet channel that covers the water cooling jacket, increasing the water inlet cooling area and prolonging the water inlet cooling time, so that the structure to be cooled can be fully and evenly cooled. At the same time, the heat is quickly removed through the design of the straight first water return channel.

[0018] When the utility model adopts a plurality of first water inlet channels with the same shape and size, the water inlet water pressure can be balanced, which helps to evenly cool and prolong the service life of the water cooling jacket.

[0019] Under the condition of meeting their respective usage functions, the first water inlet channel, the first water return channel and the second channel of the water cooling jacket of the utility model have rich design styles and combination forms. The use of 3D printing technology can make the shape, position, size and combination form of these channels unrestricted.

[0020] The addition of the water distribution block in the utility model enables the intake and return of water for several water cooling jackets to be completed with one-way water inlet and one-way water return. That is, connecting a water tank responsible for water inlet can complete the water inlet of the existing welding torch. At the same time, the water distribution block controls the water flow in the pipeline through the change of the pipeline diameter. The change of the pipeline diameter determines the cross-sectional size of the pipeline. When the water pump of the cooling water circulation system conveys cooling water, the water flow in the large pipeline is large, and the water flow in the small pipeline is small, which simplifies the overall structure and control process of the cooling water circulation system.

[0021] When the water cooling structure of the utility model is applied to the cooling of a welding torch, the water cooling jacket can be adaptively designed into a pipe-shaped structure that fits the welding torch. The water cooling jacket serves as the barrel of the gun, and the barrel body and the water cooling jacket are combined into one. The water cooling jacket directly cools itself and also takes into account the original conveying function of the barrel, improving the utilization rate of the structure and materials and reducing the overall volume of the welding torch.

[0022] The structure of the utility model is compact. The water cooling jacket integrates the water cooling structure, and the water distribution block only needs single-way water inlet. The combined design of the water cooling jacket and the water distribution block ensures the cooling effect while reducing the assembly time and difficulty of the welding torch. Description of the Drawings

[0023] Figure 1 It is a schematic radial cross-sectional view of a water cooling jacket of the utility model;

[0024] Figure 2 It is a schematic diagram of a curve connection mode of a first water inlet channel of the utility model;

[0025] Figure 3 It is a schematic diagram of the connection between a water distribution block and a water cooling jacket of the utility model;

[0026] Figure 4 It is a schematic diagram of a water distribution block structure of the utility model;

[0027] Figure 5It is a schematic structural diagram of a welding torch of the present utility model;

[0028] Figure 6 It is a schematic diagram of the cooling inlet / return water connection of a nozzle of a welding torch of the present utility model.

[0029] Explanation of the reference numerals in the drawings:

[0030] 1 - water-cooling jacket; 11 - inner layer; 10 - water-cooling layer; 12 - outer layer; 101 - first water inlet channel; 102 - first water return channel; 103 - second channel; 2 - water distribution block; 201 - total water inlet; 2011 - first water inlet branch pipe; 2012 - second water inlet branch pipe; 20111 - first water inlet sub-branch pipe; 20112 - second water inlet sub-branch pipe; 202 - total water return; 2021 - first water return branch pipe; 2022 - second water return branch pipe; 203 - outer shell; 2031 - second mounting hole; 204 - gunstock mounting groove; 2041 - first mounting hole; 3 - barrel; 301 - barrel outer shell; 302 - partition; 4 - gunstock; 5 - nozzle; 6 - welding torch. Specific embodiments

[0031] Next, the technical solutions in the present utility model will be clearly and completely described in conjunction with the drawings of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present utility model and its application or use.

[0032] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only used to explain the relative positional relationship and movement conditions between the components in a certain specific posture. If this specific posture changes, the directional indication will also change accordingly. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0033] In addition, in the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] Embodiment 1

[0035] This embodiment introduces a water-cooling structure, including a water-cooling jacket 1 sleeved on the outer periphery of the structure to be cooled; as Figure 1 shown in the schematic radial cross-sectional view of the water-cooling jacket, the water-cooling jacket 1 includes an inner layer 11, a water-cooling layer 10, and an outer layer 12 from the inside to the outside. The water-cooling layer 10 is provided with a plurality of first water inlet channels 101 that are connected end to end but not communicated along the outer periphery of the inner layer 11; the water-cooling layer 10 is further provided with a plurality of first water return channels 102 and a plurality of second channels 103 along the outer periphery of the first water inlet channels 101; the first water return channels 102 are used to collect the return water after the inlet water is transported to the other end of the water-cooling jacket along the first water inlet channels 101; the second channels 103 are used to transport the cooling water of other structures to be cooled. The cooling water includes inlet water and return water.

[0036] In addition to transporting the cooling water of the structure to be cooled in the inner layer 11 of the water-cooling jacket 1 of the present utility model, it also serves the function of transporting the cooling water for other cooling structures.

[0037] Figure 1 The schematic radial cross-sectional view of the water-cooling jacket shown gives a combined integration method of the first water inlet channels 101, the first water return channels 102, and the second channels 103: five first water inlet channels 101, one water return channel 102, and one second channel 103 are arranged in layers in a ring shape.

[0038] In order to ensure stable inlet water pressure and uniform cooling effect, when there are multiple first water inlet channels 101, the first water inlet channels 101 have the same shape and size and are evenly arranged on the outer periphery of the inner layer 11, as Figure 1 shown. The positions of the 5 first water inlet channels 101 are different, but their shapes and sizes are the same, and they are evenly arranged on the outer periphery of the inner layer 11 of the water-cooling jacket.

[0039] Figure 1 It should not be regarded as a limitation to the application scenarios of the present utility model. The first water inlet channels 101 of the present utility model are arranged in a ring on the outer periphery of the inner layer 11, and the first water return channels 102 and the second channels 103 are arranged in a ring on the outer periphery of the first water inlet channels. As for the quantity, shape, position, size, and combination of each channel, there are a variety of implementation methods.

[0040] To better integrate the various water-cooling components of the water-cooling jacket 1 and save the overall structural space, the first return water channel 102 and the second water channel 103 can be strip-shaped structures, and the first return water channel 102 and the second water channel 103 are adapted to the space structure between the first water inlet channel 101 and the outer layer 12. As Figure 1 shown, one side of the radial section of the strip-shaped structure of the first return water channel 102 is an arc-shaped structure adapted to the outer periphery of the first water inlet channel 101, and the other side is a straight-line structure adapted to the shape of the outer layer 12 of the water-cooling jacket; the radial section of the strip-shaped structure of the second water channel 103 Figure 1 layer is an arc-shaped structure adapted to the outer periphery of the first water inlet channel 101, and the other side is also an arc-shaped structure adapted to the outer layer 12 of the water-cooling jacket.

[0041] To ensure the cooling effect, the first water inlet channel 101 of the present utility model is respectively connected to both ends of the water-cooling jacket in a curved manner; the first return water channel is a straight-through water channel. By means of curved water inlet, the flowing area of the cooling water is increased, and the cooling time is prolonged. At the same time, by means of straight-through water return, the heat is quickly drained away, so that the structure to be cooled can be cooled more effectively.

[0042] As Figure 2 shown by a curved connection method of the first water inlet channel, 5 first water inlet channels 101 are spirally wound around and connected to both ends of the water-cooling jacket 1. In addition to Figure 2 the curved connection method shown, the curved connection method of the first water inlet channel can also be selected as other methods such as wavy.

[0043] To make the shape, position, size and combination form of each water channel unrestricted, the present utility model adopts 3D printing technology to realize the production of rich design styles and combination forms of the water-cooling jacket 1.

[0044] Embodiment 2

[0045] Based on the above Embodiment 1, this embodiment introduces a welding torch.

[0046] The water-cooling structure introduced in Embodiment 1 further includes a water distribution block 2. Combining Figure 3 and Figure 4 shown, the water distribution block 2 includes a total water inlet 201 and a total water return 202. The water distribution block 2 is respectively connected to a plurality of the water-cooling jackets 1 through pipelines. The water distribution block 2 is used to distribute the water inlet of the total water inlet 201 to each water-cooling jacket 1 through pipelines, and collect the water return of each water-cooling jacket 1 through pipelines to the total water return 202 for discharge. The water distribution block 2 controls the water flow rate of the pipeline through the change of the pipeline diameter.

[0047] The welding torch introduced in this embodiment, combining Figures 3 to 5As shown, it includes a barrel 3 and a buttstock 4. The welding torch 6 adopts a combined water-cooling structure of a water-cooling jacket 1 and a water distribution block 2. The barrel 3 is composed of the water-cooling jacket 1. The water distribution block 2 is provided with a buttstock installation groove 204, and the buttstock installation groove 204 is a groove adapted to the buttstock 4. Above the buttstock installation groove 204, there are 2 first installation holes 2041, and the first installation holes 2041 are threaded holes penetrating through the water distribution block 2. The upper end face of the buttstock 4 is provided with threaded holes adapted to the first installation holes 2041, and the water distribution block 2 is threadedly connected to the buttstock 4 through screws adapted to the first installation holes 2041.

[0048] Combined Figure 3 and Figure 5 As shown, the welding torch 6 is a double-barrel welding torch. The barrel housing 301 wraps a double-barrel composed of two water-cooling jackets 1 with the partition 302 as the axis of symmetry. In order to save space and better integrate the overall structure of the barrel, the side of the water-cooling jacket 1 close to the partition 302 is a straight structure that fits the partition. The water-cooling jacket 1 is a tubular structure adapted to the welding torch. As Figure 1 shown, the water-cooling jacket 1 arranged on the left side of the partition 302 serves as the left barrel 3, and the right side of the radial cross-sectional view of this water-cooling jacket 1 is a straight structure; correspondingly, the water-cooling jacket 1 arranged on the right side of the partition 302 serves as the right barrel 3, and the radial cross-sectional view of this water-cooling jacket 1 has a structure form that is mirror-symmetrical to the Figure 1 radial cross-sectional view, and the axis of symmetry can be Figure 1 the right straight line.

[0049] The two water-cooling jackets 1 are respectively connected to the water distribution block 2 through pipelines. Combined Figure 3 and Figure 4 shown, the water distribution block 2 is used to connect the two water-cooling jackets 1 to convey cooling water, and shows a connection method between the water distribution block 2 and the water-cooling jacket 1.

[0050] The water distribution block 2 is made of non-metallic material, integrating insulation, support and water distribution functions. It is realized through machining and does not require 3D printing production, which reduces costs. Different from the traditional three-way cooling water circuit that requires three sets of independent water-cooling structures and water tanks for water supply circulation, this embodiment only requires a set of cooling water circulation system for water inlet and return. The water distribution block 2 is designed to control the water flow rate in the pipeline through the change of the pipeline diameter. The change of the pipeline diameter determines the cross-sectional size of the pipeline. When the water pump of the cooling water circulation system conveys cooling water, the water flow rate in the large pipeline is large, and the water flow rate in the small pipeline is small.

[0051] As Figure 4As shown, the total inlet water 201 is connected to the first inlet water branch pipe 2011 and the second inlet water branch pipe 2012 through the pipeline of the water distribution block 2. The cross-sectional dimension of the pipeline of the total inlet water 201 is designed to be more than 3 times that of the cross-sectional area of the traditional single inlet water pipeline, so as to ensure that the single-pipe flow rate of the total inlet water is not less than the total water flow rate of the original traditional 3-way inlet water; the cross-sectional dimension of the pipeline of the first inlet water branch pipe 2011 is designed to be twice that of the second inlet water branch pipe 2012. Thus, the total inlet water 201 is divided into 2 paths.

[0052] As Figure 3 shown, the first inlet water branch pipe 2011 is connected to the inlet water of the left water-cooling jacket 1. The connection method is as follows: the first inlet water branch pipe 2011 is evenly divided into two pipelines as the first inlet water branch pipe 20111 and the second inlet water branch pipe 20112. Thus, the total inlet water 201 is evenly divided into three paths. The pipeline of the first inlet water branch pipe 20111 is connected to the first inlet water channel 101 of the left water-cooling jacket 1, and the pipeline of the second inlet water branch pipe 20112 is connected to the second water channel of the left water-cooling jacket 1. The above are two of the three evenly divided inlet water paths. The other inlet water path of the three evenly divided inlet water paths ( Figure 3 not shown) is that the second inlet water branch pipe 2012 is connected to the first inlet water channel 101 of the right water-cooling jacket 1.

[0053] The pipeline water flow rate distribution method of the total return water 202 is the same as that of the total inlet water 201. It is also first divided into two paths, and the cross-sectional dimension of one path is twice that of the other path. Then the path with the larger cross-sectional dimension is evenly divided into two paths, achieving the effect of evenly dividing the three-way water flow rate.

[0054] As Figure 4 shown, the total return water 202 is connected to the first return water branch pipe 2021 and the second return water branch pipe 2022 through the pipeline of the water distribution block 2. The cross-sectional dimension of the pipeline of the total return water 202 is designed to be the same as that of the total inlet water, so as to ensure that the single-pipe flow rate of the total return water is not less than the total water flow rate of the original traditional 3-way return water; the cross-sectional dimension of the pipeline of the first return water branch pipe 2021 is designed to be twice that of the second return water branch pipe 2022. Thus, the total return water 202 is divided into 2 paths.

[0055] As Figure 3 shown, the second return water branch pipe 2022 is connected to the return water of the left water-cooling jacket 1. The connection method is as follows: the pipeline of the second return water branch pipe 2022 is connected to the first return water channel 102 of the left water-cooling jacket 1. The above is one of the three evenly divided return water paths. The other two return water paths of the three evenly divided return water paths ( Figure 3 not shown) are that the first return water branch pipe 2021 is evenly divided into two pipelines as the first return water branch pipe and the second return water branch pipe. Thus, the total return water 202 is evenly divided into three paths. The pipeline of the first return water branch pipe is connected to the first return water channel 102 of the right water-cooling jacket 1, and the pipeline of the second inlet water branch pipe is connected to the second water channel 103 of the right water-cooling jacket 1.

[0056] Combined with Figure 5 and Figure 6As shown, the structure for cooling the welding torch 6 further includes a nozzle 5. Each of the two water-cooling jackets 1 has a second water channel 103, and the second water channels 103 are respectively used for conveying the inlet water and the return water of the nozzle 5. Combining Figure 3 As shown, the second water channel 103 of the left water-cooling jacket 1 is used for conveying the inlet water of the nozzle 5. Correspondingly, the second water channel 103 of the right water-cooling jacket 1 is used for conveying the return water of the nozzle 5.

[0057] As Figure 3 As shown, in order to protect the connecting pipeline between the water distribution block 2 and the water-cooling jacket 1, and to support the installation of the barrel 3 and the supporting components of the barrel 3, a housing 203 is further assembled on the water distribution block 2. The water distribution block 2 and the housing 203 are each provided with 4 upper and lower matching second mounting holes 2031. The second mounting holes 2031 are threaded holes, and the housing 203 can be fixedly connected to the water distribution block 2 by screws matching the second mounting holes 2031.

[0058] The embodiments of the present utility model have been described above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above specific embodiments. The above specific embodiments are merely illustrative rather than restrictive. Under the inspiration of the present utility model, those of ordinary skill in the art can also make many forms without departing from the spirit of the present invention and the scope protected by the claims. All of these are within the protection scope of the present utility model.

Claims

1. A water cooling structure, characterized in that: include: A water cooling jacket (1) is sleeved around the outer periphery of the structure to be cooled; The water cooling jacket (1) comprises, from inside to outside, an inner layer (11), a water cooling layer (10) and an outer layer (12); The water cooling layer (10) is provided with a plurality of first water inlet channels (101) connected end to end but not connected along the outer periphery of the inner layer (11); The water cooling layer (10) is also provided with a plurality of first water return channels (102) and a plurality of second water channels (103) along the outer periphery of the first water inlet channel (101); The first water return channel (102) is used to collect the return water after the inlet water is transported along the first water inlet channel (101) to the other end of the water cooling jacket (1); The second water channel (103) is used to transport cooling water for other cooled structures.

2. The water cooling structure according to claim 1, characterized in that: The first water inlet channel (101) is connected to both ends of the water cooling jacket (1) in a curved manner; The first return water channel (102) is a straight water channel.

3. The water cooling structure according to claim 2, characterized in that: The curvilinear connection method of the first water inlet channel (101) includes spirally surrounding and connecting the two ends of the water cooling jacket (1).

4. The water cooling structure according to claim 1, characterized in that: When there are a plurality of first water inlet channels (101), the first water inlet channels (101) have the same shape and size and are evenly arranged on the periphery of the inner layer (11); The first water return channel (102) and the second water channel (103) are strip-shaped structures, and the first water return channel (102) and the second water channel (103) are adapted to the spatial structure between the first water inlet channel (101) and the outer layer (12).

5. The water cooling structure according to claim 1, characterized in that: The water cooling jacket (1) is manufactured by 3D printing.

6. The water cooling structure according to claim 1, characterized in that: It also includes a water distribution block (2), wherein the water distribution block (2) includes total inlet water (201) and total return water (202); The water distribution block (2) is connected to a plurality of water cooling jackets (1) through pipelines; The water distribution block (2) is used to distribute the inlet water of the total inlet water (201) to each water cooling jacket (1) through a pipeline, and to collect the return water of each water cooling jacket (1) through a pipeline to the total return water (202) for discharge.

7. The water cooling structure according to claim 6, characterized in that: The total inlet water (201) is divided into a first inlet water branch (2011) and a second inlet water branch (2012) through a pipeline of a water dividing block (2); The total return water (202) is divided into a first return water branch (221) and a second return water branch (222) through a pipeline of a water distribution block (2); The water distribution block (2) controls the water flow rate of the pipeline by changing the diameter of the pipeline, wherein the pipeline cross-sectional size of the first water inlet branch (211) is twice that of the second water inlet branch (212); and the pipeline cross-sectional size of the first water return branch (2021) is twice that of the second water return branch (2022).

8. A welding gun, comprising a gun barrel (3) and a gun stock (4), characterized in that: It also includes the water cooling structure according to any one of claims 6 or 7, wherein the water cooling jacket (1) constitutes the gun barrel (3), the water cooling jacket (1) is a tubular structure adapted to the welding gun (6), and the water distribution block (2) is fixedly connected to the gun stock (4) by screw threads.

9. The welding gun according to claim 8, characterized in that The gun barrel (3) is a double-barreled gun barrel, and two water cooling jackets form the gun barrel. The water cooling jackets (1) are connected to the water distribution blocks (2) through pipelines.

10. The welding gun according to claim 9, characterized in that It also includes a nozzle (5), and the second water channels (103) of the two water cooling jackets (1) are respectively used to transport inlet water and return water for cooling the nozzle (5).

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