Inner pressure sealed type screwed joint

Abstract

The invention relates to an internal pressure sealing type screwed nipple which is particularly used for the sealing and the connection with an inlet or an outlet of a container. The invention belongs to the technical field of sealing devices, and is characterized in that the internal pressure sealing type screwed nipple comprises hollow bars, a U-shaped film threading card is arranged on a projected step at the lower end of the hollow bar, a gasket and an elastic sealing washer are positioned between the U-shaped film threading card and the lower surface of the screwed nipple, the external threads at the upper end of the screwed nipple are matched with a screw nut, the internal threads at the upper end of the screwed nipple are matched with the external threads at the lower end of a convolution screwed nipple, ball thrust bearings are arranged in the convolution screwed nipple and between the hollow bars, a fixing disc is fixed with the convolution screwed nipple, through holes are arranged in the screwed nipples, and the hollow bars penetrate through the screwed nipple. The invention has the advantages of simple, compact and reasonable structure, convenient operation, low labor intensity, high operation efficiency, difficult damage of the internal threads of the inlet and the outlet of the container, and reliable sealing effect.

Description

Internal pressure sealed threaded joint technical field The invention relates to an internal pressure-sealed threaded joint, specifically used for sealing connection with the inlet and outlet of a container, and belongs to the technical field of sealing devices. Background technique At present, when carrying out various methods of pressurization tests on pressure vessels, the sealing method between the threaded joints used in the test equipment and the internal threads at the inlet and outlet of the container is usually to wrap a raw material tape or Apply sealant, and then tighten the threaded joint to meet the sealing requirements. After the test is completed, the threaded joint for the test needs to be loosened vigorously. This method has the following four disadvantages: 1. The labor intensity is high; 2. The seal is unreliable; 3. The operation efficiency is low; 4. The inner thread of the container inlet and outlet is easily damaged. Contents of the invention Th...

AI Technical Summary

Problems solved by technology

This method has the following four disadvantages: 1. High labor intensity; 2. Unreliable sealing; 3. Low operating efficiency; 4. The inner thread of the container inlet and outlet is easily damaged

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