JP2013249894A5 - - Google Patents

Description

The invention according to claim 5 is an expansion / contraction flexible joint in which the tubular member is formed of a tubular ring body, and the ring body is mounted on a stepped surface formed on the inner peripheral side of the joint body.

According to the invention which concerns on Claim 5 , it can provide as an expansion joint by forming a cylindrical member with a ring body, and can ensure expansion and contraction, and can expand and contract piping caused by high water pressure fluctuation or external force. Absorb to prevent damage to the piping system. With respect to water pressure and external force exceeding a predetermined value, the pipe and instrument can be prevented from being further extended and excessively extended, and the pipe can be maintained in a stable state when a predetermined load is applied.

Claims (5)

  In an expansion / contraction flexible joint that seals a joint pipe provided with a flange at the distal end on the insertion side of the joint body and holds it in a stretchable and watertight manner, a separate or integral annular spacer is provided at the base of the flange of the joint pipe, A cylindrical member attached to the joint pipe is disposed on the inner periphery of the joint body on the opening side, and a circumferential clearance smaller than the outer diameter of the annular spacer is formed on the inner peripheral side of the cylindrical member. The expansion / contraction flexible joint is characterized in that, when a force exceeding a predetermined value is applied in the axial direction, the annular spacer is press-fitted into the back side position of the circumferential gap.   2. A circumferential step slightly larger than the outer diameter of the annular spacer is provided at a back side position of a circumferential gap provided in the cylindrical member, and the annular spacer is brought into contact with the circumferential step at a normal time. The expansion-contraction flexible joint described in 1.   The expansion and contraction according to claim 2, wherein a rounded portion or a tapered surface is formed at a corner of the annular spacer on the circumferential step side, and a rounded portion or a tapered surface is formed on the contact side of the annular step of the circumferential spacer. Flexible joint.   The outer periphery of the cylindrical member is formed into a ball shape, and an O-ring is mounted between the outer periphery of the ball-shaped portion and the inner periphery of the joint body on the opening side, and the inner periphery of the cylindrical member and the joint pipe The expansion-contraction flexible joint of any one of Claims 1 thru | or 3 which mounted | wore with the outer periphery of this. The expansion / contraction flexible joint according to claim 1 , wherein the tubular member is formed of a tubular ring body, and the ring body is attached to a stepped surface formed on an inner peripheral side of the joint body .