An oxidation-proof sealing device for pipe welding

Abstract

The utility model provides a kind of anti-oxidation sealing device for pipeline welding, to solve the problem of the pipeline welding sealing device of prior art cannot be self-adaptive different pipe diameter, inconvenient to use. Mainly include annular sealing matrix, connecting ring, support, pull rod and sealing torus;The utility model has good dynamic sealing adaptability, by axial pull rod driving center connecting ring axial movement, further drive annular sealing matrix deformation, such as: fold or open, to realize the sealing or unsealing of pipeline inner wall;It also has very high security, argon can be injected into sealing area by the cavity of pull rod to replace oxygen to prevent oxidation during welding.

Description

Technical Field

[0001] This utility model relates to the field of industrial pipeline sealing technology, and in particular to an anti-oxidation sealing device for pipeline welding. Background Technology

[0002] Welding of existing pipelines requires isolating the air at the weld joint surface to prevent air from causing oxidation in the weld due to high temperatures during the welding process. The traditional isolation method is to use argon gas to displace the air at the pipeline weld. Since air flows through both the inside and outside of the pipeline, and welding is required at the opening, argon gas can be introduced as much as possible for displacement, while the inside of the pipeline can be sealed to isolate the air.

[0003] The problem is that traditional sealing devices can only seal the inner wall of a fixed pipe diameter and cannot adapt to different pipe diameters, making them very inconvenient to use. Utility Model Content

[0004] This application addresses the shortcomings of the prior art by providing an anti-oxidation sealing device for pipeline welding. By axially pulling the tie rod, the central connecting ring moves axially, thereby deforming the annular sealing substrate to achieve sealing or release of the pipeline inner wall.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: An anti-oxidation sealing device for pipe welding includes an annular sealing base, an axially movable connecting ring coaxially sleeved in the center of the inner side of the base, multiple sets of support members distributed circumferentially along the connecting ring, and a tie rod coaxially disposed in the center of the connecting ring. The pull rod is connected to the inner wall of the connecting ring so that the connecting ring can be displaced axially when the pull rod moves axially.

[0006] The outer circumference of the connecting ring is provided with multiple hinge rings for connecting the support member, and the inner circumference of the connecting ring is also provided with multiple hinge rings for connecting the tie rod.

[0007] Furthermore, the pull rod is a thin-walled, hollow stainless steel tube, the interior of which is configured to allow the introduction of argon gas.

[0008] Furthermore, the bottom of the annular sealing substrate is an open annular cross-section, and the bottom of the annular sealing substrate is physically supported by a sealing ring.

[0009] Furthermore, the support member is a long stainless steel rod, one end of which is hinged to the bottom ring of the annular sealing base, and the other end is hinged to the outer circumference of the connecting ring.

[0010] Furthermore, the inner wall of the connecting ring is hinged to the pull rod via a short stainless steel rod.

[0011] The advantages of this utility model over the prior art are as follows: Dynamic sealing adaptability: By axially pulling the tie rod, the central connecting ring moves axially, thereby causing the annular sealing base to deform, such as shrinking or opening, to achieve sealing or release of the inner wall of the pipeline.

[0012] 2) High safety: Argon gas can be injected into the sealed area through the cavity of the tie rod to replace oxygen and prevent oxidation during the welding process. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a diagram showing the usage state of this utility model when applied to pipe welding.

[0014] The components include: 1. Annular sealing base; 2. Connecting ring; 3. Support component; 4. Tie rod; 5. Sealing ring. Detailed Implementation

[0015] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0016] This utility model provides a retractable sealing device for pipelines, which aims to solve the problem that existing pipeline welding sealing devices cannot adapt to different pipe diameters and are inconvenient to use.

[0017] like Figure 1 and Figure 2 As shown, it includes an annular sealing base 1, a coaxially sleeved connecting ring 2 that can move axially inside the center of the base, multiple sets of support members 3 distributed circumferentially along the connecting ring 2, and a tie rod 4 coaxially disposed at the center of the connecting ring 2. The pull rod 4 is connected to the inner wall of the connecting ring 2 so that the connecting ring 2 can be displaced axially when the pull rod 4 moves axially.

[0018] The outer circumference of the connecting ring 2 is provided with multiple hinge rings for connecting the support member 3, and the inner circumference of the connecting ring 2 is also provided with multiple hinge rings for connecting the tie rod 4.

[0019] In one embodiment of this utility model, the pull rod 4 is a thin-walled hollow stainless steel tube, the interior of which is configured to allow the introduction of argon gas.

[0020] In one embodiment of the present invention, the bottom of the annular sealing base 1 is an open annular cross section, and the bottom of the annular sealing base 1 is physically supported by a sealing ring 5.

[0021] In one embodiment of this utility model, the support member 3 is a stainless steel long rod. One end of the stainless steel long rod is hinged to the bottom ring of the annular sealing base 1, and the other end is hinged to the outer circumference of the connecting ring 2.

[0022] In one embodiment of this utility model, the inner wall of the connecting ring 2 is hinged to the pull rod 4 by a short stainless steel rod.

[0023] The specific structure and working principle of this utility model are as follows: A preferred embodiment is: an annular sealing substrate 1, the bottom of which is an open annular cross section, and the structural rigidity is enhanced by a sealing ring 5; Axially movable connecting ring 2: coaxially sleeved on the inner side of the annular sealing base 1, with an outer hinge ring on its outer ring and an inner hinge ring on its inner ring. Pull rod 4: It passes through the center of the connecting ring 2 along the axis and exits from the top of the cone. Its body is hinged to the inner hinge ring of the connecting ring 2 through a short stainless steel rod, thus establishing a circular motion connection between the two.

[0024] Multiple sets of support components 3: 6-8 units, not limited, are long stainless steel rods, one end of which is hinged to the sealing ring 5 at the bottom of the annular sealing base, and the other end is hinged to the outer hinge ring of the connecting ring 2; (The figure is a simplified schematic diagram, and this hinge method is a conventional and mature technology, so it will not be shown in the figure again) Argon gas passage: Rod 4 is a thin-walled hollow stainless steel tube, and its inner cavity is connected to an external argon gas source.

[0025] It is particularly important to note that the connecting ring 2 does not directly contact the pipe, but rather drives the sealing substrate to deform to achieve a seal.

[0026] Working principle: Step 1: Before welding, open valve 1 and purge with argon gas for 1-2 minutes to replace the air. Continuously purge the weld joint with argon gas to ensure that the weld joint is filled with protective argon gas. Step 2: When the welding machine is welding, first turn on 3 to ensure that the air is cut off on the surface of the weld joint. During the welding process, argon gas is continuously injected into the sealing device in the pipeline to prevent the weld from oxidizing due to high temperature caused by air during the welding process.

[0027] Step 3: When welding to the last part of the pipe, close valve 1 slightly to ensure positive pressure inside and outside the pipe at the welded joint.

[0028] Note: Throughout the welding process, the argon gas pressure should be maintained at a positive pressure both inside and outside the pipe, and this pressure should be within the safe pressure range.

[0029] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. An anti-oxidation sealing device for pipe welding, characterized in that: It includes an annular sealing base (1), a coaxially sleeved connecting ring (2) that can move axially inside the center of the base, multiple sets of support members (3) distributed circumferentially along the connecting ring (2), and a tie rod (4) coaxially set at the center of the connecting ring (2). The pull rod (4) is connected to the inner wall of the connecting ring (2) so as to drive the connecting ring (2) to axial displacement when the pull rod (4) moves axially; The outer circumference of the connecting ring (2) is provided with multiple hinge rings for connecting the support member (3), and the inner circumference of the connecting ring (2) is also provided with multiple hinge rings for connecting the tie rod (4).

2. The apparatus according to claim 1, characterized in that: The pull rod (4) is a thin-walled hollow stainless steel tube, the interior of which is configured to allow the introduction of argon gas.

3. The apparatus according to claim 1, characterized in that: Also includes: The bottom of the annular sealing substrate (1) is an open annular cross section, and the bottom of the annular sealing substrate (1) is physically supported by a sealing ring (5).

4. The apparatus according to claim 1, characterized in that: The support member (3) is a stainless steel long rod. One end of the stainless steel long rod is hinged to the bottom ring of the annular sealing base (1), and the other end is hinged to the outer circumference of the connecting ring (2).

5. The apparatus according to claim 1, characterized in that: The inner wall of the connecting ring (2) is hinged to the pull rod (4) by a stainless steel short rod.

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