Pressure balancing type expansion joint based on end face sliding seal compensation technology

Abstract

The invention relates to a pressure balancing type expansion joint based on an end face sliding seal compensation technology. The expansion joint comprises an inlet end pipe, a working corrugated pipeI, a balancing corrugated pipe, a working corrugated pipe II and an outlet end pipe which are sequentially connected and multiple groups of pull rod structures. Each pull rod structure is composed ofan end plate I fixedly arranged on the inlet end pipe in a sleeving manner, an intermediate pipe assembly I, an intermediate pipe assembly II, an end plate II fixedly arranged on the outlet end pipein a sleeving manner and a pull rod, wherein each intermediate pipe assembly I and the corresponding intermediate pipe assembly II are arranged on both sides of the balancing corrugated pipe. An end face sliding seal compensation structure is arranged on the portion, between the end plates II and the working corrugated pipe II, of the outlet end pipe. The end face sliding seal compensation structure is composed of an end flange A, an end flange B, a sliding gasket, a flange sealing piece, flange bolts and flange nuts, wherein the outlet end pipe A is fixedly sleeved with the end flange A, andthe outlet end pipe B is fixedly sleeved with the end flange B. By the adoption of the technology, the transverse displacement compensation capacity of the pressure balancing type expansion joint is improved, meanwhile the stress of the end flanges for the end face sliding seal is lowered, the thickness reduction design of the flanges is realized, and the cost of the flanges is lowered.

Description

technical field [0001] The invention belongs to the technical field of sealing, in particular to a pressure-balanced expansion joint based on end-face sliding sealing compensation technology. Background technique [0002] my country's expansion joint standard GB / T12777 general technical conditions for metal bellows expansion joints defines straight pipe pressure balanced expansion joints as: two working bellows located at both ends and a balanced bellows located in the middle, tie rods and end plates, etc. Composed of structural parts, it is mainly used for expansion joints that absorb axial displacement and can balance the pressure thrust of bellows. In order to increase the lateral displacement compensation capability of the straight pipe pressure balance type expansion joint, CN201520791414.0 straight pipe pressure balance type compensator is designed as a compound bellows for one of the working bellows, and the compound bellows can increase the lateral displacement by con...

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Problems solved by technology

The straight pipe pressure balanced expansion joint is a constrained expansion joint. When the sealing method of a sliding seal type expansion joint is directly applied to the straight pipe pressure balanced expansion joint, the connection between the end flange and the sliding flange at this time belongs to In a typical flange connection structure, since the constrained expansion joint is installed on a pipeline without a fixed support, when the direction of the pipeline changes, the axial thrust caused by the pressure acting on the elbow needs to be borne by the flange bolts, and the bolts also It is necessary to provide the sealing pretightening force of the O-ring. The force of the end flange of this structure is harsh, and the flange needs to be thicker to meet the sliding and sealing requirements. Therefore, this sliding sealing structure is applied to the straight pipe pressure balance type There are uneconomical disadvantages when the expansion joint is installed

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