Back argon filling protection device for pipeline welding

Abstract

The utility model discloses a pipeline welding back argon filling protection device, which relates to the technical field of pipeline welding protection, and comprises a gas distribution assembly and an annular cavity channel, the annular cavity channel is a double-layer tubular inner cavity channel, the inner layer of the annular cavity channel is provided with gas distribution holes, and the outer layer of the annular cavity channel is provided with gas distribution holes. One end face of the annular cavity channel is connected with welding glass, and the other end face of the annular cavity channel is a welding end. The air inlet assembly is connected to the annular cavity channel; the handheld assembly comprises a handle, one end of the handle is a threaded connection internal thread head, and a threaded hole matched with the threaded connection internal thread head is formed in the annular cavity channel. The utility model provides a back argon filling protection device for pipeline welding, which accurately realizes welding protection, is convenient for observing the forming condition of the back of a welding part, reduces the use of argon, reduces the cost, has low requirements on the processing precision of parts, is convenient to disassemble and assemble, has a wide application range and can be repeatedly used.

Description

Technical Field

[0001] This utility model relates to the field of pipeline welding protection technology, specifically to an argon backfill protection device for pipeline welding. Background Technology

[0002] In chemical or industrial plants, pipelines serve as a crucial component for transporting various media. In recent years, with increasing industrialization, the scale of industrial or chemical plants has grown significantly, leading to larger pipeline specifications. Some pipelines, such as stainless steel pipes, require internal argon purging during welding to ensure weld quality. While small-diameter pipelines can be directly filled with argon for protection, purging the entire cavity of large-diameter pipelines is prohibitively expensive and cost-inefficient. A more effective approach is to use partial argon purging, achieving the desired protection while reducing costs. Utility Model Content

[0003] Technical problem to be solved by the utility model

[0004] The technical problem to be solved by this utility model is to provide a pipe welding back argon purging protection device, which can accurately achieve welding protection, facilitate observation of the back forming of the welded part, reduce the use of argon gas, reduce costs, has low requirements for the processing precision of parts, is easy to disassemble and assemble, has a wide range of applications, and can be reused.

[0005] Technical solution

[0006] To solve the above problems, the technical solution provided by this utility model is as follows:

[0007] A pipe welding back-side argon purging protection device includes a gas distribution assembly, comprising an annular cavity, the annular cavity being a double-layered tubular internal cavity, the inner layer of the annular cavity having a gas distribution hole, one end face of the annular cavity being connected to a welding glass, and the other end face being a welding end; an air inlet assembly connected to the annular cavity; and a handheld assembly including a handle, one end of which is a threaded internal thread, and the annular cavity having a threaded hole that mates with the threaded internal thread.

[0008] The annular cavity employs a double-layered tubular internal cavity design, which facilitates more efficient distribution of argon gas. The inner layer features multiple evenly distributed gas distribution holes, ensuring uniform release of argon gas into the welding area and guaranteeing effective weld protection. One end face is connected to a welding glass, allowing operators to directly observe the welding process and adjust welding parameters promptly. The other end face is the welding end, the part that directly contacts the pipe to be welded. The gas inlet assembly introduces argon gas from the gas source into the annular cavity, ensuring smooth gas flow and adequate and appropriate protection of the welding area. The handheld assembly facilitates operator handling; the handle features a threaded internal thread for connection to a threaded hole in the annular cavity, facilitating easy assembly and disassembly.

[0009] Optionally, the gas distribution holes are evenly distributed along the circumference of the inner layer of the annular cavity.

[0010] By evenly distributing gas distribution holes on the inner circumference of the annular cavity, argon gas can be uniformly released into the welding area, providing a consistent protective atmosphere for welding and contributing to improved weld quality. The evenly distributed gas distribution holes also more effectively cover the back of the weld, reducing the impact of harmful gases such as oxygen on the welding process, thereby improving weld formation and increasing weld strength and aesthetics.

[0011] Optionally, the gas distribution hole is located near the end face of the welded glass.

[0012] Positioning the gas distribution port close to the welding glass ensures that argon gas first covers the area of ​​the weld that most needs protection—the space near the weld point. This more effectively removes oxygen and other gases that may affect weld quality, venting other gases from the weld end and providing an optimal inert gas protective environment for welding.

[0013] Optionally, the air intake assembly includes an air intake connector, an air intake short pipe, a pressure reducing valve, a short pipe, and an air intake switch valve connected in sequence. The air intake switch valve is connected to the inlet of the annular cavity through the short pipe, and the air intake connector is connected to an argon gas supply device.

[0014] The inlet connector connects directly to the argon gas supply equipment. A short inlet pipe connects the inlet connector and the pressure reducing valve. The main function of this pipe is to smoothly deliver argon gas from the supply equipment to the pressure reducing valve. The pressure reducing valve regulates the argon gas pressure, ensuring it meets the precise pressure requirements for welding, thus helping to maintain stable weld quality. After the pressure reducing valve, another short pipe connects the pressure reducing valve to the inlet switch valve, continuing to guide the argon gas flow along the predetermined path. The inlet switch valve is located at the end of the entire gas path and connects directly to the inlet of the annular cavity via a short pipe. The inlet switch valve allows the operator to control the argon gas inflow as needed, thereby precisely adjusting the gas shielding effect during welding.

[0015] Optionally, the connection between the air intake connector, air intake short pipe, pressure reducing valve, short pipe and air intake switch valve can be made by thread or compression fitting.

[0016] Threaded or ferrule connections facilitate disassembly and assembly.

[0017] Optionally, the axis of the threaded connection's internal thread is perpendicular to the axis of the air intake assembly.

[0018] When the operator holds the handle horizontally, the air intake assembly can hang straight down, making it less prone to bending during operation and reducing the chance of damage and gaps in the interface.

[0019] Optionally, the handle may have a textured surface.

[0020] The textured surface significantly increases friction between the hand and the handle, ensuring a secure grip and reducing slippage even when wearing gloves or with sweaty hands.

[0021] Optionally, the connection between the handle and the annular cavity is symmetrically arranged on both sides of the gas distribution assembly.

[0022] The symmetrical design helps maintain good balance throughout the use of the device. When the operator holds the equipment for welding, it will not tilt to one side due to uneven weight distribution, thus providing a more stable operating experience. The symmetrical handle connection on both sides increases the overall structural stability of the device. Especially when precise control of the welding position is required, improved stability is crucial for ensuring welding quality.

[0023] Beneficial effects

[0024] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0025] The technical solution provided by this utility model not only solves the problem of excessively high argon purging costs during traditional large-diameter pipe welding, but also improves welding quality and efficiency through precise gas distribution, convenient observation windows, and easy assembly and disassembly. Furthermore, it does not require high precision in component machining and can be reused, further reducing operating costs. Attached Figure Description

[0026] Figure 1 A schematic diagram of the structure of an argon-filled back-side protection device for pipe welding, as proposed in an embodiment of this utility model. Figure 1 ;

[0027] Figure 2 A schematic diagram of the structure of an argon-filled back-side protection device for pipe welding, as proposed in an embodiment of this utility model. Figure 2 ;

[0028] Figure 3 A side view of a pipe welding back-side argon purging protection device proposed as an embodiment of this utility model;

[0029] 1. Intake assembly; 101. Intake connector; 102. Intake short pipe; 103. Pressure reducing valve; 104. First short pipe; 105. Intake switch valve; 106. Second short pipe; 2. Handheld assembly; 201. Handle; 202 / 203. Threaded internal thread; 3. Gas distribution assembly; 301. Annular cavity; 302. Gas distribution hole; 4. Welded glass. Detailed Implementation

[0030] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0031] Example 1

[0032] Combined with appendix Figure 1 An argon-filled back-side protection device for pipe welding includes a gas distribution component 3, an air inlet component 1, and a handheld component 2.

[0033] Combined with appendix Figure 2 The air intake assembly 1 is connected to the annular cavity 301. It includes an air intake connector 101, a pressure reducing valve 103, an air intake switch valve 105, an air intake short pipe 102, a first short pipe 104, and a second short pipe 106. After the argon gas source is connected to the air intake connector 101, the pressure and flow rate of the protective argon gas are adjusted by the pressure reducing valve 103. The pressure-adjusted protective argon gas enters the annular cavity 301 of the gas distribution assembly after passing through the air intake switch valve 105, flows out through the evenly arranged gas distribution holes 302, and flows towards the back of the welding position to provide argon gas protection for the back of the welding position.

[0034] The air intake assembly 1 includes an air intake connector 101, an air intake short pipe 102, a pressure reducing valve 103, a short pipe, and an air intake switch valve 105 connected in sequence. The short pipe includes a first short pipe 104 and a second short pipe 106. The air intake switch valve 105 is connected to the inlet of the annular cavity 301 through the second short pipe 106, and the air intake connector 101 is connected to an argon gas supply device.

[0035] The intake short pipe 102, the first short pipe 104, and the second short pipe 106 are all steel pipes of the same diameter and are connected to the pressure reducing valve 103 and the intake switch valve 105 by compression fittings. The intake short pipes 102 and 106 are connected to the intake connector 101 and the annular cavity 301 by welding. At the connection between the intake assembly short pipe 106 and the annular cavity 301, the outer wall of the annular cavity 301 is provided with a through hole, the diameter of which is the same as the outer diameter of the short pipe 106.

[0036] The connection between the air intake connector 101, the air intake short pipe 102, the pressure reducing valve 103, the short pipe and the air intake switch valve 105 is made by thread or compression fitting, which is convenient for disassembly and assembly.

[0037] The handheld component 2 includes a handle 201, one end of which is a threaded internal thread 202 / 203. The annular cavity 301 is provided with a threaded hole that mates with the threaded internal thread 202 / 203. The threaded internal threads 202 and 203 are symmetrically arranged on both sides of the annular cavity 301, and the axes of the threaded internal threads 202 and 203 are arranged perpendicular to the axis of the air intake component 1.

[0038] The handle 201 has textured surfaces. The connection between the handle 201 and the annular cavity 301 is symmetrically arranged on both sides of the gas distribution assembly 3.

[0039] The observation component 4 is a circular welded glass piece, the diameter of which is the same as the outer wall diameter of the annular cavity 301. The observation component 4 and the annular cavity 301 are bonded together, and the connection is well sealed. (See attached...) Figure 3 The gas distribution assembly 3 includes an annular cavity 301, which is a double-layered tubular internal cavity. The inner layer of the annular cavity 301 is provided with a gas distribution hole 302. One end face of the annular cavity 301 is connected to a welded glass 4, and the other end face is a welded end. Two threaded internal threads 202 and 203 are connected to the handle 201 by threads. The two threaded internal threads 202 and 203 are welded to the annular cavity 301. The air inlet connector 101 is welded to the short pipe 102. The short pipe 102 is ferrule-fitted to the pressure reducing valve 103. The pressure reducing valve 103 is ferrule-fitted to the short pipe 104. The short pipe 104 is ferrule-fitted to the air inlet switch valve 105. The air inlet switch valve 105 is ferrule-fitted to the short pipe 106. The short pipe 106 is welded to the annular cavity 301. The welded glass 4 is bonded to the annular cavity 301.

[0040] By uniformly arranging multiple gas distribution holes 302 on the inner side of the annular cavity 301, the protective argon gas flows out from the gas distribution holes 302 into the interior of the gas distribution assembly 3 and towards the back of the welding position, thus ensuring a stable flow rate of the protective argon gas. The gas distribution holes 302 are uniformly distributed along the circumference of the inner layer of the annular cavity 301. The gas distribution holes 302 are close to the end face of the welding glass 4. Multiple gas distribution holes 302 are uniformly arranged on the inner side of the annular cavity 301, and the distribution holes 302 are of the same size and arranged on the same cross section of the annular cavity 301.

[0041] The usage method is as follows:

[0042] First, connect the external argon gas supply pipe to the inlet connector 101 and set the pressure reducing valve 103. The operator holds the handle 201 and covers the back of the welding position with the argon filling device. Open the external argon gas supply valve, and the argon gas passes through the pressure reducing valve 103 to the inlet switch valve 105. Opening the inlet switch valve 105 sends the argon gas into the annular cavity 301. The argon gas flows through the gas distribution hole 302 to the back of the welding position, achieving the effect of argon filling protection for the back of the welding area. At the same time, the formation of the weld seam on the back of the welding area can be observed in real time through the observation component 4. If there are any problems, the welder should be notified in time for adjustment or handling. After welding is completed, first close the inlet switch valve 105, then close the external argon gas supply valve, disconnect the connection between the inlet connector 101 and the external argon gas supply pipe, and disconnect the argon filling protection device. Disconnect the threaded or clamping connections of the handle 201, inlet switch valve 105, pressure reducing valve 103, etc., and the argon filling protection device can be removed and recovered.

[0043] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An argon-filled back-side protection device for pipe welding, characterized in that, include A gas distribution assembly includes an annular cavity, which is a double-layered tubular internal cavity. The inner layer of the annular cavity is provided with gas distribution holes. One end face of the annular cavity is connected to a welded glass, and the other end face is a welded end. The air intake assembly is connected to the annular cavity; A handheld assembly includes a handle, one end of which is a threaded internal thread, and the annular cavity is provided with a threaded hole that mates with the threaded internal thread.

2. The argon-filled back-side protection device for pipe welding according to claim 1, characterized in that, The gas distribution holes are evenly distributed along the circumference of the inner layer of the annular cavity.

3. The argon-filled back-side protection device for pipe welding according to claim 2, characterized in that, The gas distribution hole is located near the end face of the welded glass.

4. The argon purging protection device for the back side of pipe welding according to claim 1, characterized in that, The air intake assembly includes an air intake connector, an air intake short pipe, a pressure reducing valve, a short pipe, and an air intake switch valve connected in sequence. The air intake switch valve is connected to the inlet of the annular cavity through the short pipe, and the air intake connector is connected to an argon gas supply device.

5. The argon-filled back-side protection device for pipe welding according to claim 4, characterized in that, The connection between the air inlet connector, air inlet short pipe, pressure reducing valve, short pipe and air inlet switch valve is by thread or compression fitting.

6. The argon-filled back-side protection device for pipe welding according to claim 1, characterized in that, The axis of the threaded connection's internal thread is perpendicular to the axis of the air intake assembly.

7. The argon-filled back-side protection device for pipe welding according to claim 1, characterized in that, The handle has a textured surface.

8. The argon-filled back-side protection device for pipe welding according to claim 1, characterized in that, The connection between the handle and the annular cavity is symmetrically arranged on both sides of the gas distribution assembly.

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