Double-seal socket-and-spigot compression fitting and assembly method

Abstract

The present invention discloses a double-sealed socket-and-spigot compression fitting and an assembly method, wherein the double-sealed socket-and-spigot compression fitting comprises a pipe and a socket-and-spigot compression weld joint, wherein the pipe is inserted from the open end to the welding end, and the portion located in the socket-and-spigot compression weld joint after insertion is an insertion portion, wherein the outer wall of the insertion portion is sleeved with a circle of sealing tape, wherein one end of the sealing tape is flush with the open end, and the other end is close to the welding end and an anaerobic adhesive layer is filled in the gap between the sealing tape and the welding end, and an annular groove is provided on the outer pipe body corresponding to the sealing tape; the pipe fitting and the socket-and-spigot compression weld joint are tightly connected by ring pressing with a hydraulic tool, and the two ring pressing locations of the ring pressing are respectively located at the sealing tape location and the anaerobic adhesive layer location. The present invention improves the structure and assembly method of the socket-and-spigot compression fitting, which can effectively reduce the amount of glue injection and prevent the occurrence of glue overflow, while greatly saving the installation cost, and can also increase the sealing performance, and can ensure the quality of pipeline engineering installation under extreme conditions such as high and low temperature areas and high pressure environments.

Description

Technical Field

[0001] The invention relates to a pipe fitting and an assembly method, in particular to a double-sealed socket-and-spigot compression pipe fitting and an assembly method. Background Art

[0002] The socket-and-spigot compression-connection pipe fittings realize the connection function, turning function, branching function, conversion function, etc. This is a new type of double-layer socket-and-spigot pipe fittings, which are mainly used in pipeline projects in high-temperature and high-pressure areas. In the prior art, the installation method is: apply a layer of anaerobic sealant, commonly known as "liquid raw tape", on the inner and outer walls of the stainless steel pipe end, insert it into the double-layer socket-and-spigot of the pipe fitting, use a special compression tool to press the pipe and the pipe fitting together, and make the sealant filled between the pipe and the pipe fitting solidify and seal in anoxic state.

[0003] The disadvantages of this technology are:

[0004] (1) A large amount of anaerobic adhesive is used during the installation process, causing adhesive overflow during installation.

[0005] (2) After the glue overflows, the glue inside the pressed tube is not saturated, which easily produces voids and pores, forming leaks.

[0006] (3) At the same time, anaerobic adhesive has a certain degree of brittleness after drying. When mechanically clamping stainless steel pipe fittings, there will be a certain rebound, which cannot achieve a complete seal. It is insufficient to withstand high and low temperature environments and high pressure. Summary of the invention

[0007] The purpose of the present invention is to provide a double-seal socket-type compression fitting and assembly method that can solve the above-mentioned problems, solve the problem of insufficient pressure-bearing capacity in high temperature and high pressure areas, eliminate the glue overflow phenomenon during pipeline installation, and enhance the sealing of pipeline connections.

[0008] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a double-sealed socket-and-spigot compression fitting, comprising a pipe made of stainless steel material and a socket-and-spigot compression weld joint, the socket-and-spigot compression weld joint comprising an inner pipe body and an outer pipe body, the two are arranged in parallel, one end is welded as a welding end, and the other end is for the pipe to be inserted as an open end, the pipe is inserted from the open end to the welding end, and the part located in the socket-and-spigot compression weld joint after insertion is the insertion part, the outer wall of the insertion part is sleeved with a circle of sealing tape, one end of the sealing tape is flush with the open end, and the other end is close to the welding end and the gap between the welding end and the sealing tape is filled with an anaerobic adhesive layer, and the outer pipe body is provided with an annular groove for the sealing tape to be embedded at the corresponding sealing tape;

[0009] The pipe fitting and the socket-and-spigot compression welded joint are tightly connected by ring pressing with a hydraulic tool, and two ring pressing locations are respectively located at the sealing tape and the anaerobic adhesive layer.

[0010] Preferably, the sealing tape is made of fluororubber, silicone rubber or nitrile rubber, with a thickness of 0.6mm-3.5mm and a width of 20-80mm. The standard of the anaerobic adhesive is HG / T3737.

[0011] An assembly method for a double-seal socket-and-spigot compression fitting comprises the following steps:

[0012] (1) Select the pipe, cut it according to the set length, and grind the cut edge of the pipe on a grinding tool to remove the burrs and rough edges around it;

[0013] (2) Selecting an inner tube body and an outer tube body that match the pipe material, processing an annular groove for inserting the sealing tape on the inner wall of the outer tube body near the open end, and then welding the inner tube body and the outer tube body to form a socket-and-spigot pressure-fit welded joint that matches the pipe material;

[0014] (3) Determine the position of the insertion part according to the length of the pipe inserted into the socket-and-spigot press-fit welding joint, apply sealing tape to the corresponding annular groove of the insertion part, and apply anaerobic adhesive to the remaining positions;

[0015] (4) inserting the pipe treated in step (3) into the socket-and-spigot pressure-fit welding joint of step (2) and inserting it to the welding end so that the sealing tape is located in the annular groove and the anaerobic adhesive is located between the sealing tape and the welding end;

[0016] (5) Use a ring pressing tool to press the pipe and the socket-fitted joint. First, perform a ring pressing at the sealing tape and then perform a ring pressing at the anaerobic adhesive.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] 1. The present invention improves the structure of the socket-and-spigot compression fitting, arranges a sealing tape on the fitting, and arranges an annular groove for embedding the sealing tape at the inner wall of the outer tube body of the socket-and-spigot compression welding joint corresponding to the sealing tape, so that when the fitting is inserted into the socket-and-spigot compression welding joint, the anaerobic adhesive can be sealed between the sealing tape and the welding end; thus, while ensuring the sealing effect, the amount of glue poured during the previous clamping is reduced to prevent glue overflow.

[0019] 2. The processing technology has been improved. After inserting the pipe fitting, the sealing tape is first pressed in a ring to form a closed space between the sealing tape and the welding end. Since the anaerobic adhesive is not pressed in a ring, there will be no adhesive overflow, and the sealing tape can effectively compensate for the rebound of the stainless steel pipe fitting after deformation; then the anaerobic adhesive in the closed space is pressed in a ring to fill the gap of the welding end with the anaerobic adhesive, so that the closed space is filled with anaerobic adhesive as much as possible, without pores, and with high adhesion.

[0020] 3. The present invention adopts the combination of sealing tape, anaerobic adhesive layer and specific processing sequence, forms a closed space through the sealing tape and the first ring pressing, and then fills the sealed space with sealant through the second ring pressing of the anaerobic adhesive, and the sealant does not overflow. This effectively reduces the amount of glue filling and prevents the occurrence of glue overflow, greatly saves installation costs, and can also increase the sealing performance, which can ensure the quality of pipeline engineering installation under extreme conditions such as high and low temperature areas and high pressure environments.

[0021] 4. The sealing tape used in the present invention is a widened special sealing tape, and the material is fluororubber, silicone rubber, and nitrile rubber that are resistant to high and low temperatures and have a long service life, and the service life can reach more than 50 years. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a cross-sectional view of the structure of the present invention;

[0023] Figure 2 for Figure 1 A cross-sectional view of a socket press-fit weld joint in FIG.

[0024] Figure 3 for Figure 1 Schematic diagram of the structure of the medium pipe;

[0025] Figure 4 It is a schematic diagram of the structure of the present invention after ring pressing.

[0026] In the figure: 1. pipe; 2. outer pipe body; 3. inner pipe body; 4. sealing tape; 5. annular groove; 6. socket-and-spigot press-weld joint; 7. anaerobic adhesive layer; 8. first annular pressing point; 9. second annular pressing point. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Example 1: See Figure 1-Figure 4 A double-sealed socket-and-spigot compression fitting comprises a pipe 1 made of stainless steel material and a socket-and-spigot compression weld joint 6, wherein the socket-and-spigot compression weld joint 6 comprises an inner pipe body 3 and an outer pipe body 2, which are arranged in parallel, one end of which is welded as a welding end, and the other end is an open end for the pipe 1 to be inserted, wherein the pipe 1 is inserted from the open end to the welding end, and the portion located in the socket-and-spigot compression weld joint 6 after insertion is an insertion portion, wherein a circle of sealing tape 4 is sleeved on the outer wall of the insertion portion, wherein one end of the sealing tape 4 is flush with the open end, and the other end is close to the welding end and an anaerobic adhesive layer 7 is filled between the sealing tape 4 and the welding end, and an annular groove 5 for the sealing tape 4 to be embedded is provided on the outer pipe body 2 at a position corresponding to the sealing tape 4;

[0029] The pipe fitting and the socket-and-spigot press-welded joint 6 are tightly connected by ring pressing with a hydraulic tool, and two ring pressing locations are located at the sealing tape 4 and the anaerobic adhesive layer 7 respectively.

[0030] An assembly method for a double-seal socket-and-spigot compression fitting comprises the following steps:

[0031] (1) Select the pipe 1, cut it according to the set length, and grind the cut of the pipe 1 on a grinding tool to remove the burrs and rough edges around it;

[0032] (2) Selecting an inner tube body 3 and an outer tube body 2 that match the tube 1, processing an annular groove 5 for inserting the sealing tape 4 on the inner wall of the outer tube body 2 near the open end, and then welding the inner tube body 3 and the outer tube body 2 to form a socket-and-spigot press-fit welded joint 6 that matches the tube 1;

[0033] (3) Determine the position of the insertion portion according to the length of the pipe 1 inserted into the socket-and-spigot press-fit welding joint 6, sleeve the sealing tape 4 on the position of the insertion portion corresponding to the annular groove 5, and apply anaerobic adhesive on the remaining positions;

[0034] (4) inserting the pipe 1 processed in step (3) into the socket-and-spigot pressure-fit welding joint 6 in step (2) and inserting it to the welding end, so that the sealing tape 4 is located in the annular groove 5, and the anaerobic adhesive is located between the sealing tape 4 and the welding end;

[0035] (5) Use a ring pressing tool to press the pipe 1 and the socket-and-spigot press-weld joint 6 together. First, perform a ring pressing at the sealing tape 4. For details, see Figure 4 The first ring press is at 8, and then the ring press is performed again at the anaerobic adhesive. For details, see Figure 4 The second ring pressure is at 9.

[0036] The present invention divides the insertion part of the pipe into two parts, the sealing tape 4 located on the outside and the anaerobic adhesive located on the inside. When the anaerobic adhesive dries, an anaerobic adhesive layer 7 is formed. Therefore, during assembly, the length of the insertion part, the width of the sealing tape 4, and the setting position must be known in advance before the operation. When the pipe is inserted into the socket-and-spigot press-fit welding head 6 and inserted to the bottom, the sealing tape 4 is just located in the annular groove 5, and the anaerobic adhesive is just located between the sealing tape 4 and the welding end. At this time, press the sealing tape 4 first, and then press the anaerobic adhesive.

[0037] The sealing tape 4 can enhance the sealing performance of the pipeline project. A layer of anaerobic adhesive is then applied to the inner and outer parts of the sealing tape to the end of the pipe 1 to reduce the amount of glue injected during the previous compression and prevent glue overflow. In this way, the sealing tape seal is added to the original anaerobic adhesive and compression seal, the sealing performance is enhanced, and the use of anaerobic adhesive is reduced, which greatly saves the installation cost.

[0038] Example 2: See Figure 1-Figure 4The sealing tape 4 is made of fluororubber, silicone rubber or nitrile rubber, with a thickness of 0.6 mm to 3.5 mm and a width of 20 mm to 80 mm. The standard of the anaerobic adhesive is HG / T3737. The rest is the same as in Example 1.

[0039] In this embodiment, a widened special sealing tape 4, such as about 70 mm, is added to the existing compressed pipe, and the material is fluorosilicone rubber that is resistant to high and low temperatures and has a long service life. Its service life can reach more than 20 years, and the quality of pipeline project installation can be ensured under extreme conditions such as high and low temperature areas and high pressure environments.

[0040] Example 3: See Figure 1-Figure 4 In this embodiment, the thickness of the sealing tape 4 is related to the diameter of the pipe 1. For example, a pipe 1 with a diameter of 15 mm may use a sealing tape 4 with a thickness of 0.6 mm, and a pipe 1 with a diameter of 400 mm may use a sealing tape 4 with a thickness of 3.5 mm. The rest is the same as in the first embodiment.

[0041] The present invention enhances the sealing effect of the connection of the pipeline project, fills the existence of some small gaps caused by the rebound when the stainless steel is clamped, and can adapt to pipeline projects in various regional environments. Through experimental verification, this solution can effectively reduce the overflow of anaerobic adhesive and reduce the amount of anaerobic adhesive used in the original technology, so that the sealing performance of the pipeline project is stronger in high and low temperature climate and high pressure environment.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An assembly method for a double-sealed socket-and-spigot compression fitting, the double-sealed socket-and-spigot compression fitting comprising a pipe made of stainless steel and a socket-and-spigot compression weld joint, the socket-and-spigot compression weld joint comprising an inner pipe body and an outer pipe body, the two are arranged in parallel, one end is welded as a welding end, and the other end is an open end for inserting the pipe, characterized in that: The pipe is inserted from the open end to the welding end, and the part located in the socket-and-spigot pressure-fit welding joint after insertion is the insertion part. The outer wall of the insertion part is sleeved with a circle of sealing tape. One end of the sealing tape is flush with the open end, and the other end is close to the welding end and the gap between the sealing tape and the welding end is filled with an anaerobic adhesive layer. The outer pipe body is provided with an annular groove for embedding the sealing tape at the corresponding sealing tape position. The pipe fitting and the socket-and-spigot pressure-fit welding joint are tightly connected by ring pressing with a hydraulic tool, and the two ring pressing positions are respectively located at the sealing tape position and the anaerobic adhesive layer position; The assembly method comprises the following steps: (1) Select the pipe, cut it according to the set length, and grind the cut edge of the pipe on a grinding tool to remove the burrs and rough edges around it; (2) Selecting an inner tube body and an outer tube body that match the pipe material, processing an annular groove for inserting the sealing tape on the inner wall of the outer tube body near the open end, and then welding the inner tube body and the outer tube body to form a socket-and-spigot pressure-fit welded joint that matches the pipe material; (3) Determine the position of the insertion part according to the length of the pipe inserted into the socket-and-spigot press-fit welding joint, apply sealing tape to the corresponding annular groove of the insertion part, and apply anaerobic adhesive to the remaining positions; (4) inserting the pipe treated in step (3) into the socket-and-spigot pressure-fit welding joint of step (2) and inserting it to the welding end so that the sealing tape is located in the annular groove and the anaerobic adhesive is located between the sealing tape and the welding end; (5) Use a ring pressing tool to press the pipe and the socket-fitted joint. First, perform a ring pressing at the sealing tape and then perform a ring pressing at the anaerobic adhesive.

2. The assembly method of the double-sealed socket-and-spigot compression fitting according to claim 1, characterized in that: The sealing tape is made of fluororubber, silicone rubber or nitrile rubber, with a thickness of 0.6mm-3.5mm and a width of 20-80mm. The standard of the anaerobic adhesive is HG / T3737.

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