A pipe welding protection device
By designing an adaptive sealing expansion plugging assembly and an inert gas filling assembly, the problems of poor plugging effect and operational hazards in inert gas protection in pipelines have been solved, realizing efficient utilization and safe operation of inert gas.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- THE 13TH CONSTR CO LTD OF CHINA NAT CHEM ENG
- Filing Date
- 2025-07-08
- Publication Date
- 2026-07-10
AI Technical Summary
Existing inert gas protection methods for pipelines suffer from poor sealing effects, serious gas leakage, and high operational risks, especially in small-diameter pipelines where operation is difficult.
A pipeline welding protection device was designed, which adopts an expansion sealing component and an inert gas filling component. It utilizes an air bladder, an air inlet, an inner strip, and a contraction spring to form an adaptive seal. Combined with the cooperation of a telescopic rod and a spring, it achieves a tight fit to the inner wall of the pipeline, and the diffuser achieves uniform diffusion of inert gas.
It effectively prevents inert gas leakage, reduces costs, improves operational safety and convenience, is suitable for pipelines of various diameters, and avoids the risks associated with personnel entering the pipeline.
Smart Images
Figure CN224475805U_ABST
Abstract
Description
Technical Field
[0001] The embodiments disclosed herein relate to the technical field of pipeline welding protection, and more specifically, to a pipeline welding protection device. Background Technology
[0002] In the field of pipeline welding, gas shielded welding is a commonly used process. During welding, workers operate outside the pipeline. Not only must the outside of the pipeline be protected with inert gas, but inert gas (such as argon) must also be introduced into the pipeline to protect the weld joint from oxidation, thereby ensuring the welding quality.
[0003] In existing technologies, there are two commonly used methods for inert gas protection in pipelines. The first method involves sealing the inside of the pipeline on both sides of the weld joint with cardboard or other sealing materials, and then filling it with inert gas. The disadvantages of this method are poor sealing effectiveness, easy leakage of inert gas, compromised safety, and high gas consumption, increasing costs. The second method requires workers to directly enter the pipeline and install U-shaped shields near the weld joint. This method has a high risk factor. If workers are not properly protected when installing and removing the sealing materials, the inert gas can cause injury, leading to asphyxiation. Furthermore, the presence of hazardous chemicals in the pipeline also poses a significant risk to operations. This method also presents considerable operational difficulties when used in small-diameter pipelines where personnel cannot access them.
[0004] Therefore, improvements have been made to address the aforementioned issues. Utility Model Content
[0005] To overcome the above-mentioned defects, the embodiments of this disclosure provide a pipeline welding protection device, which solves the technical problem that the pipes on both sides of the weld are sealed with sealing materials such as cardboard and then filled with inert gas. The disadvantage of this method is that the sealing effect is poor and the inert gas is prone to leakage.
[0006] According to one aspect, at least one embodiment of this disclosure provides a pipe welding protection device, comprising:
[0007] A main tube and a pair of housings, the housings being fixed to both ends of the main tube surface;
[0008] An expansion plugging assembly is disposed on the main pipe and the outer casing;
[0009] A fixing plate and an inert gas filling assembly, wherein the fixing plate is fixed to the outside of the main pipe and the inert gas filling assembly is disposed on the fixing plate;
[0010] The expansion sealing assembly includes an air inlet, which is located at one end of the main pipe. Airbags are connected to the outside of the outer shell. Several air inlets are opened on both sides of the outer shell. Inner strips are provided on both sides of the inner shell. Several tension springs are connected between the inner strips.
[0011] As a further technical solution, the main tube is provided with a pair of connecting plates, the surface of the connecting plates is provided with a number of notches, the surface of the airbag is provided with a number of fitting frames, the fitting frames and the notches are rotatably connected by a telescopic rod through a pin, and a spring is fitted on the telescopic rod.
[0012] As a further technical solution, the inert gas filling assembly includes an inlet pipe, which is connected to the fixed plate and the connecting plate. A second gas nozzle is provided at one end of the inlet pipe, and a diffuser is provided at the other end of the inlet pipe. Several dispersion holes are opened around the surface of the diffuser.
[0013] As a further technical solution, a pair of hanging rings are provided on the surface of the fixing plate, and the hanging rings are located on both sides of the main pipe.
[0014] As a further technical solution, the telescopic rod has a certain tilt angle when the airbag is in the extended state.
[0015] As a further technical solution, the airbag has an overall circular tire-like structure.
[0016] As a further technical solution, the inner strip is in the form of a ring and is attached to the inner surface of the airbag. Both the inner strip and the attachment frame are made of rubber.
[0017] As a further technical solution, both ends of the access pipe are bent upwards at 90°.
[0018] The beneficial effects of the embodiments disclosed herein are as follows:
[0019] In this disclosure, the expansion sealing assembly, through the design of an airbag, air inlet, inner strip, and contraction spring, solves the problems of poor sealing effect of cardboard and easy leakage of inert gas in existing technologies. After inflation, the airbag expands and fits against the inner wall of the pipe. The cooperation between the telescopic rod and the spring allows the sealing frame to adapt to different pipe diameters, forming a tight seal, preventing gas leakage, reducing inert gas consumption, and lowering costs. Simultaneously, it eliminates the risk of personnel suffocation or exposure to hazardous chemicals by eliminating the need for personnel to enter the pipe to install the sealing component. It is suitable for pipes of various diameters, improving operational safety and convenience. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.
[0021] Figure 1 This is a schematic diagram of a structure in one embodiment of the present disclosure;
[0022] Figure 2 This is an isometric drawing of the present disclosure;
[0023] Figure 3 This is an isometric sectional view of the present disclosure;
[0024] Figure 4 Appendix to this disclosure Figure 3 Enlarged view of part A in the middle;
[0025] In the diagram: 1. Main pipe; 2. Outer shell; 3. Fixing plate; 4. Expansion sealing assembly; 4-1. Air inlet; 4-2. Airbag; 4-3. Air inlet hole; 4-4. Inner strip; 4-5. Tension spring; 4-6. Connecting plate; 4-7. Notch; 4-8. Adhesion frame; 4-9. Telescopic rod; 4-10. Spring; 5. Inert gas filling assembly; 5-1. Inlet pipe; 5-2. Second air inlet; 5-3. Diffuser; 5-4. Dispersion hole; 6. Hanging ring. Detailed Implementation
[0026] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.
[0027] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."
[0028] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.
[0029] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0030] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.
[0031] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0032] like Figures 1-4 As shown, a pipe welding protection device according to an embodiment of the present disclosure is illustrated, comprising:
[0033] A main tube 1 and a pair of outer casings 2, wherein the outer casings 2 are fixed to both ends of the surface of the main tube 1;
[0034] An expansion sealing assembly 4 is disposed on the main pipe 1 and the outer casing 2;
[0035] The fixing plate 3 and the inert gas filling assembly 5 are fixed to the outside of the main pipe 1, and the inert gas filling assembly 5 is disposed on the fixing plate 3.
[0036] The expansion sealing assembly 4 includes an air inlet 4-1, which is located at one end of the main pipe 1. Airbags 4-2 are connected to the outside of the outer shell 2. Several air inlets 4-3 are opened on both sides of the outer shell 2. Inner strips 4-4 are provided on both sides of the inner shell 4-2. Several tension springs 4-5 are connected between the inner strips 4-4. A pair of connecting plates 4-6 are provided on the main pipe 1. Several notches 4-7 are opened on the surface of the connecting plates 4-6. Several fitting frames 4-8 are provided on the surface of the airbags 4-2. A telescopic rod 4-9 is rotatably connected between the fitting frame 4-8 and the notches 4-7 through a pin. A spring 4-10 is fitted on the telescopic rod 4-9.
[0037] In some examples, an expansion sealing assembly 4 is designed to achieve efficient sealing inside the pipe. This assembly includes an air inlet 4-1 as an air source interface, which, when connected to an external air pump, can inflate the airbag 4-2. The air inlets 4-3 on both sides of the outer shell 2 are evenly distributed to ensure rapid and uniform gas entry into the airbag 4-2. The inner strip 4-4 inside the airbag 4-2 and the tension spring 4-5 form a pre-tightening structure. In the uninflated state, the tension spring keeps the airbag 4-2 in a contracted shape for easy installation; when gas is injected into the airbag 4-2, the internal air pressure overcomes the tension of the spring, causing the airbag 4-2 to expand and open.
[0038] The notch 4-7 on the connecting plate 4-6 is connected to the contact frame 4-8 on the surface of the airbag 4-2 via a telescopic rod 4-9 and a spring 4-10, forming an adaptive adjustment mechanism. When the airbag 4-2 inflates, the telescopic rod 4-9 extends outward under the cushioning of the spring 4-10, causing the contact frame 4-8 to fit against the inner wall of the pipe, ensuring tight contact between the airbag 4-2 and the inner wall of the pipe and preventing leakage. This design can adapt to pipes of different diameters, automatically adjusting the contact force through the elastic deformation of the spring 4-10. For example, during pipe welding, the inflated airbag 4-2, with the cooperation of the telescopic rod 4-9 and the spring 4-10, tightly fits and seals the pipe port, effectively preventing external air from entering and providing a sealed space for welding.
[0039] like Figures 1-4 As shown in the figure, the inert gas filling component 5 proposed in this embodiment includes an inlet pipe 5-1, which is connected to the fixed plate 3 and the connecting plate 4-6. A second gas nozzle 5-2 is provided at one end of the inlet pipe 5-1, and a diffuser 5-3 is provided at the other end of the inlet pipe 5-1. A plurality of dispersion holes 5-4 are opened around the surface of the diffuser 5-3.
[0040] In some examples, to achieve uniform filling of inert gas within a confined space, an inert gas filling component 5 is designed. This component includes a second nozzle 5-2 at one end of an inlet pipe 5-1, which is used to connect to an inert gas source. The gas is delivered to a diffuser 5-3 via the inlet pipe 5-1. The dispersion holes 5-4 on the surface of the diffuser 5-3 are arranged in a ring array, and the hole diameter and angle are specially designed to ensure that the gas diffuses radially and uniformly into the pipe.
[0041] The fixing plate 3 and the connecting plate 4-6 securely install the inlet pipe 5-1 outside the pipeline, ensuring a stable gas delivery path. After the pipeline is sealed by the expansion sealing assembly 4, inert gas enters from the second gas nozzle 5-2 and quickly fills the entire enclosed space through the dispersion holes 5-4 of the diffuser 5-3. The layout and angle of the dispersion holes 5-4 prevent gas accumulation or eddy currents, ensuring a uniform inert gas concentration in all areas of the pipeline. For example, when welding stainless steel pipelines, the inert gas is evenly filled through the diffuser 5-3, forming a protective gas layer in the welding area, isolating oxygen, preventing metal oxidation, improving welding quality, and ensuring a smooth, porosity-free weld surface.
[0042] For example, such as Figure 1 As shown, a pair of hanging rings 6 are provided on the surface of the fixing plate 3, and the hanging rings 6 are located on both sides of the main pipe 1.
[0043] In some examples, a pair of hanging rings 6 on the surface of the fixing plate 3 are symmetrically arranged on both sides of the main pipe 1, providing fulcrums for hoisting or fixing the device. The hanging rings 6 are forged from metal, have a closed-loop structure, and are welded or bolted to the fixing plate 3, capable of supporting the overall weight of the device. For example, at a pipe welding site, operators can suspend the protective device above the pipe using hooks or slings threaded through the hanging rings 6, preventing the device from directly contacting the ground and causing contamination, while also facilitating adjustments to the device's position on the pipe, thus improving installation convenience.
[0044] For example, such as Figure 3 As shown, the telescopic rod 4-9 has a certain tilt angle when the airbag 4-2 is in the open state.
[0045] In some examples, the telescopic rod 4-9 is tilted when the airbag 4-2 is deployed. This design enhances the contact pressure between the airbag 4-2 and the inner wall of the pipe through mechanical decomposition. Under the thrust of the spring 4-10, the tilted telescopic rod 4-9 converts the axial force into a radial component, causing the outer side of the airbag 4-2 to press more tightly against the inner wall of the pipe. For example, when the airbag 4-2 inflates, the tilt angle of the telescopic rod 4-9 allows the contact frame 4-8 to adhere tightly to the pipe wall with a certain pressure. Even if there are slight unevennesses in the inner wall of the pipe, the adaptive adjustment of the tilted structure can ensure that the sealing surface is evenly stressed, preventing local sealing failure caused by vertical support and improving the reliability of the sealing.
[0046] For example, such as Figure 1 As shown, the airbag 4-2 has an overall circular tire-like structure.
[0047] In some examples, the airbag 4-2 adopts a circular, tire-like structure. Its annular design allows for uniform expansion and conformation to the inner wall of the pipe after inflation. The cross-section of the tire-shaped airbag 4-2 is arc-shaped, and the gas pressure is evenly distributed within the internal cavity, avoiding the problem of uneven local expansion that may occur with traditional flat airbags 4-2. For example, when the airbag 4-2 is inflated to its rated pressure, the arc-shaped structure forms an annular sealing band with the inner wall of the pipe, effectively blocking air penetration. This is particularly suitable for circumferential sealing of circular pipes, ensuring the airtightness of the welding protection space.
[0048] For example, such as Figure 3 As shown, the inner strip 4-4 has a circular structure and is attached to the inner surface of the airbag 4-2. Both the inner strip 4-4 and the mounting frame 4-8 are made of rubber.
[0049] In some examples, both the inner strip 4-4 and the mounting frame 4-8 are made of rubber. The annular inner strip 4-4 fits against the inner side of the airbag 4-2, providing elastic support for the airbag 4-2. The rubber inner strip 4-4 and mounting frame 4-8 possess good flexibility and wear resistance, and the annular structure of the inner strip 4-4 guides the uniform expansion of the airbag 4-2. For example, in pipes of different diameters, the deformation capability of the rubber material allows the mounting frame 4-8 to adapt to the curvature of the pipe wall. Even if the pipe has a certain degree of ellipticity, the elastic compression of the rubber can fill the gaps, ensuring a sealing effect while preventing metal parts from scratching the inner wall of the pipe.
[0050] For example, such as Figure 3 As shown, both ends of the access pipe 5-1 are bent upwards at 90°.
[0051] In some examples, the 90° bends at both ends of the inlet pipe 5-1 optimize the inert gas delivery path and adaptability to the installation space. The bend design makes the inlet and outlet ends of the inlet pipe 5-1 perpendicularly distributed, avoiding interference from the main pipe 1 or other components. For example, in narrow pipe welding scenarios, the bend in the inlet pipe 5-1 can guide the second nozzle 5-2 to a position that is easy to connect to the gas source. At the same time, the diffuser 5-3 is perpendicular to the inside of the pipe, ensuring that the gas is directly injected into the enclosed space, reducing corner resistance in the delivery path, allowing the inert gas to fill quickly and evenly, and improving protection efficiency.
[0052] In practical use: Place the main pipe 1 at the pipe to be welded, and fix the device using the hanging ring 6 on the surface of the fixing plate 3, aligning the outer shell 2 with both ends of the pipe. Connect the air inlet 4-1 to an external air pump to inflate the air bladder 4-2. The gas enters the air bladder 4-2 through the air inlet 4-3 of the outer shell 2, overcoming the tension of the contraction spring 4-5 and causing the air bladder 4-2 to expand. At the same time, the telescopic rod 4-9 tilts and opens under the action of the spring 4-10, causing the bonding frame 4-8 to tightly adhere to the inner wall of the pipe, completing the sealing of both ends of the pipe. Subsequently, connect the inert gas source through the second air inlet 5-2. The inert gas enters the diffuser 5-3 through the inlet pipe 5-1 and diffuses evenly into the inside of the pipe through the dispersion hole 5-4, forming a protective gas layer. During welding, the expansion sealing component 4 maintains the sealed environment inside the pipe, and the inert gas filling component 5 continuously replenishes the gas to prevent oxidation of the weld joint. After welding is completed, release the gas from the air bladder 4-2 and disassemble the device.
[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.
Claims
1. A pipe welding protection device, characterized in that, include: A main tube (1) and a pair of outer shells (2), the outer shells (2) being fixed to both ends of the surface of the main tube (1); An expansion sealing assembly (4) is disposed on the main pipe (1) and the outer casing (2); The fixing plate (3) and the inert gas filling assembly (5) are fixed to the outside of the main pipe (1) and the inert gas filling assembly (5) is disposed on the fixing plate (3); The expansion sealing assembly (4) includes an air inlet (4-1) which is located at one end of the main pipe (1). Airbags (4-2) are connected to the outside of the outer shell (2). Several air inlets (4-3) are opened on both sides of the outer shell (2). Inner strips (4-4) are provided on both sides of the inner shell (4-2). Several tension springs (4-5) are connected between the inner strips (4-4).
2. The pipe welding protection device according to claim 1, characterized in that, The main tube (1) is provided with a pair of connecting plates (4-6), the surface of the connecting plates (4-6) is provided with several notches (4-7), the surface of the airbag (4-2) is provided with several fitting frames (4-8), the fitting frames (4-8) and the notches (4-7) are rotatably connected by a telescopic rod (4-9) through a pin, and a spring (4-10) is fitted on the telescopic rod (4-9).
3. A pipe welding protection device according to claim 2, characterized in that, The inert gas filling assembly (5) includes an inlet pipe (5-1), which is connected to the fixed plate (3) and the connecting plate (4-6). A second gas nozzle (5-2) is provided at one end of the inlet pipe (5-1), and a diffuser (5-3) is provided at the other end of the inlet pipe (5-1). A plurality of dispersion holes (5-4) are opened around the surface of the diffuser (5-3).
4. The pipe welding protection device according to claim 1, characterized in that, The surface of the fixing plate (3) is provided with a pair of hanging rings (6), which are located on both sides of the main tube (1).
5. A pipe welding protection device according to claim 2, characterized in that, The telescopic rod (4-9) has a certain tilt angle when the airbag (4-2) is in the open state.
6. A pipe welding protection device according to claim 1, characterized in that, The airbag (4-2) has an overall circular, tire-like structure.
7. A pipe welding protection device according to claim 2, characterized in that, The inner strip (4-4) is in a circular structure and is attached to the inner surface of the airbag (4-2). Both the inner strip (4-4) and the mounting frame (4-8) are made of rubber.
8. A pipe welding protection device according to claim 3, characterized in that, Both ends of the access pipe (5-1) are bent upwards at 90°.