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Connection method for thin-wall stainless steel pipes, its special tubular joint and its production method

A technology of stainless steel pipes and connection methods, which is applied in the direction of pipes/pipe joints/fittings, threaded connections, passing components, etc., which can solve the problems of poorly adjusted connection installation, weak connection, and easy influence on water quality, etc., to achieve It is not easy to loosen or leak, save materials, and have the effect of flexible assembly and disassembly

Inactive Publication Date: 2002-04-10
梁世良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It certainly has the progressive significance of its description, but there are also some fly in the ointment places, such as the use of plastic parts or stainless steel pipe fittings and thin-walled stainless steel pipes for chemical bonding connection, bonding between different materials is a relatively difficult problem, time-consuming It is easy to separate after a long time or by external force, which will affect the use; the connection between the pipe joints is a plug-in connection, the connection is not very firm, and it is easy to loosen or leak after a long time; when the connection is installed on site, when the length is slightly inconsistent , cannot adjust the connection installation well; the service life is relatively short, the adhesive is a kind of chemical agent, with certain toxicity, and it is easy to affect the water quality and other defects, which need further improvement

Method used

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  • Connection method for thin-wall stainless steel pipes, its special tubular joint and its production method
  • Connection method for thin-wall stainless steel pipes, its special tubular joint and its production method
  • Connection method for thin-wall stainless steel pipes, its special tubular joint and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1, such as Figure 1-3 As shown, the pipe joint is a straight-through structure, with a screw sleeve 2 with an external thread, and a tapered thread 21 is manufactured from the end of the screw sleeve to the middle surface, generally with a specification of 55°, at a position 6-12 mm away from the outer mouth. A position structure 22 for wrench engagement is made on the top, which can be a spline structure or a polygonal structure, such as hexagonal, octagonal, etc. The inner diameter of the screw sleeve matches the thin-walled stainless steel pipe 3, and the front end and / or tail end are also welded. Then insert the thin-walled stainless steel pipe into the screw sleeve, and connect them with argon arc welding at the front and / or rear ends, and another pipe joint 1, made of seamless steel pipe, with a position for the wrench to bite in the middle Structures, such as splines or polygons, are made with internal threads inside the mouth, which are also 55°, and th...

Embodiment 2

[0022] Example 2, such as Figure 4-5 As shown, the pipe joint is a straight-through structure, with a screw sleeve 2 with an external thread, and a tapered thread 21 is manufactured from the end of the screw sleeve to the middle surface, generally with a specification of 55°, at a position 6-12 mm away from the outer mouth. A position structure 22 for wrench engagement is made on the top, which can be a spline structure or a polygonal structure, such as hexagonal, octagonal, etc. The inner diameter of the screw sleeve matches the thin-walled stainless steel pipe 3, and then the thin-walled stainless steel pipe is inserted into the screw. In the sleeve, there is a welding cavity 23 between their contact surfaces, and they are connected by brazing, and a pipe joint 1 is made of seamless steel pipe, and there is a position structure for a wrench to engage in the middle, such as a spline or Polygonal, with internal threads inside the mouth, also 55°, and then connected by threads...

Embodiment 3

[0023] Example 3, such as Figure 6-7 As shown, the pipe joint is a three-way structure. The screw sleeve of the external thread is processed by No. 304 or No. 316 seamless steel pipe. The inner surface of the end to the middle of the screw sleeve is made with a tapered thread, generally 55°. A position structure for wrench engagement is made at the tail position, which can be a spline structure or a polygonal structure, such as hexagonal, octagonal, etc. The inner diameter of the threaded sleeve matches the thin-walled stainless steel pipe, and there is also a front end and / or tail end. Then insert the thin-walled stainless steel pipe into the screw sleeve, and connect them with argon arc welding at their front and / or rear ends. The pipe joint 1 is divided into welded connection with the pipe joint body 11 and the screw sleeve 12, and the inside of the screw sleeve Internal threads 13 are formed on the surface, which can be processed by No. 304 or No. 316 seamless steel pipes...

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Abstract

A connection method for thin-wall stainless steel pipes features that a connecting fitting with metallic screw sleeve is welded to the said pipes and then a pipe joint is used to connect them. An associated pipe joint is also disclosed. Its advantages include flexible connection and disconnection, convenient installation, high reliability and no leakage.

Description

technical field [0001] The invention relates to the technical field of a connection method for thin-walled stainless steel pipes, the technical field of related pipe joints, and the technical field of production methods thereof. Background technique [0002] Traditional metal pipes such as galvanized steel pipes, thick-walled copper pipes, thick-walled stainless steel pipes, etc., are basically connected by threaded connections, because this connection method is safe and reliable, flexible in disassembly and assembly, and easy to adjust and install on the pipeline. characteristics, so metal pipes have been in use since the advent. But now galvanized steel pipes have entered the phase-out stage, and thick-walled stainless steel pipes and copper pipes are difficult to form a market scale due to the large number of consumables and high cost of use. Therefore, metal thin-walled pipes, metal and plastic composite or pure plastic pipes have been developed one after another. Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L15/00
Inventor 梁世良
Owner 梁世良
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