Internal pressure self-sealing swivel joint

Abstract

An internal pressure self-sealing swivel joint comprises an inner pipe (1), an outer pipe (2) and a preposed sealing element (3), and is characterized in that: the inner pipe (1) comprises a straight pipe section (101) and a step section (102), two ends of the step section (102) are respectively provided with a big end face (103) and a small end face (104) which are perpendicular to an axial lead,and the outer surface of the step section (102) is provided with a conical surface section (105); the outer pipe (2) consists of an outer straight pipe section (201), a taper pipe section (202) and an end cover section (203), the taper pipe section (202) is positioned between the outer straight pipe section (201) and the end cover section (203) and is matched with the conical surface section (105) on the step section (102) of the inner pipe (1), and the end cover section (203) is sleeved on the straight pipe section (101) of the inner pipe (1); and the preposed sealing element (3) is sleevedon the straight pipe section (101) of the inner pipe (1) and positioned between the big end face (103) and the inner bottom surface of the end cover section (203). The internal pressure self-sealing swivel joint has the advantages of simple structure, convenient manufacture and low cost.

Description

Internal pressure self-sealing rotary pipe joint technical field The invention relates to a pipe joint, especially a rotary pipe joint used in pipelines, which can realize self-sealing under the action of high pressure in the pipeline itself and at the same time enable the inner and outer pipes to rotate relative to each other to realize automatic compensation of the length of the pipeline. , specifically an internal pressure self-sealing rotary pipe joint. Background technique At present, the traditional sleeve type, bellows type and steel ball type pipeline compensation devices have been gradually replaced by rotary compensators due to their complex structure, high cost, inconvenient installation and small compensation amount, and are currently being used in large quantities. The compensator has the advantages of simple structure, convenient manufacture and large amount of compensation. See Chinese patents ZL982270615 and ZL022587098 for details. However, in actual use...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to solve the existing rotary compensator complex structure, the existence of toroidal friction when rotating, and the problems of high manufacturing cost, and to design a structure that is simple, easy to manufacture and install, has no toroidal friction, and has a small number of parts The internal pressure self-sealing rotary pipe joint can be used to replace the existing rotary compensator to realize the automatic compensation of the length of the pipeline

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