JPH0627914Y2 - Telescopic tube joint - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a telescopic tube joint which is connected to an intermediate portion of the tube system and absorbs expansion and contraction of the tube system due to temperature changes and the like.

[Conventional technology]

Conventionally, there are several types of balanced expansion joints that have been devised and publicly known. For example, there is Japanese Utility Model Publication 47-26010.

[Problems to be solved by the invention]

In Japanese Utility Model Publication No. 47260, the concentric double bellows tanks are provided in parallel on one side of the main bellows, and the short pipes connected to the main bellows are connected to the room through respective through holes. Yes, when the main bellows shrinks, the whole liquid of the main bellows flows in the double bellows tank near the main bellows,
Next, into the double bellows tank on the farthest side, the volume reduced by the flow rate flowing through the through hole flows into the double bellows tank on the near side, resulting in the volume change due to the contraction of the main bellows at the same time. I can't absorb it. That is, the complete equilibrium action was difficult.

[Means for Solving the Problem] In view of such circumstances, the present invention solves this problem and provides a telescopic tube joint that performs a complete equilibrium action, that is, a short tube is provided at both ends of the main bellows. Two double tube bellows tanks having different diameters are concentrically arranged on the outside of the two short tubes, and the cross-sectional area of the inner chamber of each double bellows tank is perpendicular to the axis. Make the main bellows 1/2 cross-sectional area,
Moreover, one end of each double bellows tank is fixed to a fixed flange at the end of the opposing short pipe, and the other end is fixed to a movable flange fitted in the short pipe, and each movable flange is supported by a fixed rod or a supporting cylinder. It is fixed and held, and the inner chambers of the left and right double bellows tanks are connected by short pipes and conduits, and the volume changes due to expansion and contraction of the main bellows are absorbed in each double bellows tank at the same time. It has a structure to perform.

[Action]

The expansion joint of the present invention is used by being installed between piping systems. When the pipe joint expands and contracts due to temperature change, for example, when the pipe joint expands, the expansion of the short pipes 2 and 3 pushes the main bellows 1 from the left and right. When contracted, at the same time, the movable flanges 10 and 11 of the double bellows tanks A and B, which are connected via the support rods 13 or the support cylinders 12 fixed to the outer circumferences of the fixed flanges 4 and 5 of the short pipes 2 and 3, are mainly It is extended by the contracted distance of bellows 1. The cross-sectional area of each double bellows tank A, B in the direction perpendicular to the axis is designed to be half that of the main bellows 1. Also, since the through holes 14 and 15 communicating with the double bellows tanks A and B are directly connected to the short pipes 2 and 3 connected to the main bellows 1, the contracted volume of the main bellows 1 is 2 double tubes at the same time. Bellows tank A,
The force absorbed in B and completely balanced and applied to the anchor is only the force required to expand and contract the main bellows 1, and there is no happiness to give any damage to the piping system.

〔Example〕

Next, an embodiment of the expansion joint according to the present invention will be described with reference to the drawings.

Reference numeral 1 is a main bellows, and short pipes 2 and 3 are welded and connected to both ends.

On the outer circumference of each of the short tubes 2 and 3 with the main bellows 1 interposed therebetween,
The flanges 4 and 5 are fixed, and the fixing flanges 4 and 5 are fixed.
5, one end of a double bellows tank A, B composed of a set of two bellows tubes 6, 7 and 8, 9 having different diameters along the outer sides of the short tubes 2, 3 is concentrically opposed to each other. The double bellows tanks A and B are fixed to the movable flanges 10 and 11 fitted to the outside of the short pipes 2 and 3, respectively. In this case, the positions of the movable flanges 10 and 11 are set so that the cross sections of the inner chambers a and b of the double bellows tanks A and B are straight and perpendicular to the main bellows 1. One of the movable flanges 10 and 11 is fixedly supported by the other end of a supporting cylinder 12 having one end attached to a fixed flange 5 on the short pipe 3 side, and the other movable flange 11 is fixed on the short pipe 2 side. A projecting piece 4a provided on the flange 4 and projecting from an axially elongated hole 12a provided on the outer periphery of the support cylinder 12.
The other end side of the support rod 13 fixed to is fixedly supported.

The inner chambers a and b of the double bellows tanks A and B are communicated with the short pipes 2 and 3 close to the main bellows 1 side by conduits 14 and 15, respectively.

〔effect〕

The present invention connects short pipes to both ends with the main bellows interposed, and concentrically halves the cross-sectional area of the main bellows on the outside of each short pipe.
Complete equilibrium action is achieved by arranging double-bellows tanks each having a cross-sectional area, and by communicating the inside of each double-bellows tank with a through hole to simultaneously absorb the volume change due to expansion and contraction of the main bellows in the double-bellows tanks. Can be

[Brief description of drawings]

The drawing is a side view of a semi-vertical longitudinal section showing an embodiment of an expansion joint according to the present invention. 1 ... main bellows, 2,3 ... short pipe, 4,5 ... fixing flange, 6,7,8,9. Bellows tube 10, 11, ...
... Movable flange, 12 ... Support cylinder, 12a ... Oblong hole,
13 ... Support rods, A, B ... Double bellows tanks, a, b ...
... room

Claims (1)

[Scope of utility model registration request] 1. A short bell tube is connected with a main bellows in between, and a pair of double bellows tanks having different diameters are concentrically provided outside the short tubes at both ends with the main bellows in between. The cross-sectional area perpendicular to the axis of the inner chamber of each double bellows tank is
The cross section of the main bellows should be 1/2, and one end of each double bellows tank is fixed to the fixed flange at the end of the opposing short pipe, and the other end is fixed to the movable flange fitted to the short pipe.
Each movable flange is fixed and held to a fixed flange by a supporting rod or a supporting cylinder, and the inner chambers of the left and right double bellows tanks are connected by a short pipe and a conduit.