Double-ferrule type pipe joint

Abstract

A double-ferrule type pipe joint comprises a joint, a pipe connected with the joint in a fitted manner, a nut for compactly connecting the joint with the pipe, a front ferrule and a rear ferrule, a wide mouth end of the nut being connected with the joint, and a narrow mouth end of the nut being adaptive to the diameter of the pipe. The double-ferrule type pipe joint is characterized in that: both of the front ferrule and the rear ferrule are metal parts; an external ring surface of a hollow annular convex stage of the front ferrule compactly fits with a joint chute, a front end cutting edge of an internal ring surface of the hollow annular convex stage penetrates into the pipe body, and an external ring step surface and an external ring horizontal surface of the front ferrule seal the gap between a front edge of the joint chute and a nut platform; a rear end chamfer surface of the rear ferrule compactly fits with a nut chute arranged at the narrow mouth side of the nut, a front end lug ring of the rear ferrule extends into a front ferrule platform and a front ferrule chute sequentially, and a front end cutting edge of the lug ring penetrates into the pipe body under the pressure of the front ferrule chute. The double-ferrule type pipe joint in the invention has the advantages of reliable sealing, good anti-shedding performance, good anti-vibration performance, convenient installation, high-temperature resistance ability, high-pressure resistance ability, wide application range and the like.

Description

Technical field: [0001] The invention relates to an industrial ferrule type pipe joint, in particular to a double ferrule type pipe joint. Background technique: [0002] Ferrule pipe joints are specifically divided into single ferrule pipe joints and double ferrule pipe joints. Due to many defects, single ferrule pipe joints have been gradually replaced by double ferrule pipe joints. At present, there are two common double ferrule pipe joints, one is Parker's EO-2 pipe joint (such as figure 1 shown), and the other is a Swagelok dual ferrule mechanical grip fitting (such as figure 2 shown). [0003] The structural characteristics of the EO-2 pipe joint are: the rubber sealing ring 2 vulcanized on the metal positioning ring 1 is located between the inner cone of the joint body 3 and the outer wall of the pipe 4, blocking the only leakage channel of the joint body, and the ferrule 5. The front end enters into the chute of the sealing ring 2 to closely fit with the chute, an...

AI Technical Summary

Problems solved by technology

The pipe joint structure has excellent gas sealing and tube grip performance, but it cannot withstand high pressure, otherwise the deformed part of the tube will return in reverse and cause the rear ferrule to loosen, so it is not suitable for high pressure The connection and use of test instrument pipe joints in the working environment

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