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A self-tightening sealing method for pipe joints

A pipe joint and self-tightening technology, applied in the direction of pipes/pipe joints/fittings, pipe components, mechanical equipment, etc., can solve the problems of complex operation, low reuse rate, poor economy, etc., and achieve simple operation, simple structure, low cost effect

Active Publication Date: 2020-07-03
HARBIN ELECTRIC CORP QINHUANGDAO HEAVY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The conventional sealing technology means is to use welding technology to weld the sealing cover on the pipe nozzle, and then cut and remove the cover after the pressure test is qualified. High; 2. After cutting and removing the cap, it is necessary to perform procedures such as beveling on the nozzle, which is complicated to operate and high in cost; 3. Low reuse rate and poor economy

Method used

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  • A self-tightening sealing method for pipe joints
  • A self-tightening sealing method for pipe joints
  • A self-tightening sealing method for pipe joints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0103] Apply the pipe joint self-tightening sealing method of the present invention to the sealing of heat transfer pipe joints when the heat transfer pipes of nuclear power steam generator equipment are subjected to air pressure tests, and the specifications of the heat transfer pipes The sealing (or airtightness) of the sealing device is tested,

[0104] The method of the present invention is used to detect the tightness of the heat transfer tube of the nuclear power steam generator equipment, and it is found that there is no visible deformation and abnormal sound at the seal, and no air leakage is detected by applying soap liquid on the seal boundary, and the pressure remains unchanged during the pressure test and pressure holding process , good sealing.

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Abstract

The invention discloses a pipe joint self-tightening sealing method. The method includes steps of preparing or installing a pipe joint self-tightening high-pressure sealing device, inserting the sealing device into a pipe joint (6), fastening an outer cover (5) for preliminary sealing of the pipe joint (6), and carrying out self-tightening sealing. The high-pressure sealing device comprises the outer cover (5), a connection member (1) connecting with the outer cover (5), and an elastic member (3) between the outer cover (5) and the connection member (1). According to the method, self-tightening sealing of the pipe joint can be achieved under the pressure in the pipe with no need to apply a large initial pressure; The method has the advantages of simple operation and good sealing performance, and the sealing device adopted by the method has the advantages of simple structure, low cost and reusability, and is applied to the technical field of high-pressure sealing for various container pipe joints.

Description

technical field [0001] The invention relates to a sealing method, in particular to a self-tightening sealing method for pipe joints. Background technique [0002] Industrial containers, especially pressure vessels, often involve the sealing technology of non-flange pipe joints on these pressure vessels. When the heat exchange tube is subjected to a pressure test, the end of the tube needs to be pressure-sealed. [0003] The conventional sealing technology means is to use welding technology to weld the sealing cover on the pipe nozzle, and then cut and remove the cover after the pressure test is qualified. High; 2. After cutting and removing the cap, it is necessary to perform procedures such as beveling on the nozzle, which is complicated to operate and high in cost; 3. The reuse rate is low and the economy is poor. [0004] Therefore, there is an urgent need to develop a self-tightening sealing method for pipe joints with simple processing procedures, convenient operation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L55/11
CPCF16L55/1141
Inventor 张勇白海永张渲楠赵姗姗何春艳张和悦
Owner HARBIN ELECTRIC CORP QINHUANGDAO HEAVY EQUIP
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