Extendable and Contractible Flexible Joint

摘要

An extendable and contractible flexible joint having a pair of flexible joint portions, which are bendable and fitted and connected to a connection sleeve, in a direction of a pipe axial line. An extending motion limiting portion includes a fluid chamber into which a portion of a pressure fluid in a flow path diverges and flows, and is configured to apply a fluid pressure applied to pressure receiving surfaces of the fluid chamber. An inner joint body of each of both the flexible joint portions is configured to be attachable and detachable to and from the connection sleeve, and an outer joint body and the inner joint body of each of both the flexible joint portions are configured to be attachable and detachable to and from each other.

主权项

1. An extendable and contractible flexible joint comprising:
a pair of flexible joint portions that are bendable and have a connection portion for a fluid transport pipe; a connection sleeve that is fitted and connected across both the flexible joint portions; and an extension and contraction allowance portion that is provided in a fitted connection portion between each of both the flexible joint portions and the connection sleeve, or the connection sleeve such that relative movement between both the flexible joint portions in a direction of a pipe axial line is allowed in a set movement range, wherein each of both the flexible joint portions is made up of an outer fitting body with the connection portion, and an inner joint body with a spherical outer circumferential surface slidably fitted to a spherical inner circumferential surface of the outer joint body, and wherein the extendable and contractible flexible joint further comprises: an extending motion limiting portion that includes a fluid chamber into which a portion of a pressure fluid in a flow path, formed by both the flexible joint portions and the connection sleeve, diverges and flows, and that is configured to apply a fluid pressure applied to pressure receiving surfaces of the fluid chamber in such a manner that the pressure fluid flowing through the flow path is prevented from causing an extending motion of the extension and contraction allowance portion, and wherein the inner joint body of each of both the flexible joint portions is configured in such a manner as to be attachable and detachable to and from the connection sleeve in the direction of the pipe axial line, and the outer joint body and the inner joint body of each of both the flexible joint portions are configured in such a manner as to be attachable and detachable to and from each other in the direction of the pipe axial line.