JPS61228190A - Pipe joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a pipe joint for connecting pipes that are displaced relative to each other.

[Technical background of the invention and its problems]

In recent years, with the increase in the scale of various plants, the length of fluid distribution piping has become longer, and some of these piping are installed between different buildings.

For example, in a nuclear power plant, as shown in FIG. 6(a), a reactor building a1, a turpin building 2, etc. are constructed independently and close to each other with foundation slabs 1a and 2a, respectively. As shown in FIG. 7(a), many pipes 3.4 are provided across these independently arranged buildings 1.2. One piping 3 is connected to each foundation slab 1a.

Piping support 7.8 provided on installation floor 5, 6 of 2a
Supported by The other pipe 4 is likewise supported by a pipe support 11.12 provided on the installation floor 9.10.

When a nuclear power plant encounters a large-scale earthquake, the reactor building 1 and turpin building 2 behave independently of each other, as shown in Figure 6 (b) and (C), and the horizontal
Relative motion also occurs in the vertical direction y. At this time, the piping 3.4 installed between each building 1 and 2 is shown in Figure 7 (b
) As shown in (c), there is a relative displacement in the horizontal direction X and the vertical direction y. Therefore, when these relative displacements x and y are large, piping design has become extremely difficult.

Therefore, in order to solve the difficulty in piping design due to relative displacement during an earthquake, it has been proposed to connect piping using expandable pipe joints.

Slip expansion joints and bellows-type expansion joints are commonly used as such pipe joints.

However, the sliding expansion pipe joint allows expansion and contraction only in the axial direction and cannot be used for angular displacement or displacement in a direction perpendicular to the axis, so there is a risk of damage during a major earthquake. On the other hand, bellows-type expansion joints allow angular displacement, axial displacement, and displacement perpendicular to the axis, but when containing high-pressure fluid, the axial It is difficult to absorb displacements perpendicular to , and only small angular and axial displacements can be absorbed.

[Purpose of the invention]

The present invention has been made in consideration of these points,
It is an object of the present invention to provide a pipe joint that can connect opposing pipes while allowing large relative displacement, allows high-pressure fluid to flow, and improves the seismic resistance of the pipes.

(Summary of the Invention) The pipe joint of the present invention interconnects opposing tubular couplings by a bellows, and includes a plurality of reinforcing rings on the outer periphery of the bellows to reinforce the bellows and limit the contracted length of the bellows to a certain range. The present invention is characterized in that the coupling is formed by being connected in a flexible manner by a universal joint that is movable in the axial direction within a certain range.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5.

1 and 2 show the structure of an embodiment of the present invention.

The pipe joint 13 of this embodiment has a pipe 14 and a pipe 15 facing each other.
It is formed to connect with. This pipe fitting 13 has a tubular coupling 16 and a coupling 17 at both ends, and these couplings 16 and 17 are connected to a bellows 1.
They are interconnected by 8. In practice, each coupling 16° 17 has an adjusting 7 flange 19 at its opposite end.
20, and both ends of the bellows 18 are fixed to these adjustment flanges 19 and 20. The inner diameter of the trough of the bellows 18 is approximately equal to the inner diameter of the pipe 14.15, so as not to disturb the fluid flow. Further, a plurality of reinforcing rings 21, 21, . As shown in FIG. 1, each reinforcing ring 21 is formed in a size that provides a gap between them when the bellows 18 is at its normal length, and when the bellows 18 is contracted, the adjustment flanges 19 and 20 are formed. The bellows 18 is held in close contact with each other to prevent excessive contraction of the bellows 18. Also, each coupling 16, 17 has a pipe 14 at its outer end.
．． A flange 22,23 is provided which is connected to 15. And those 7 flanges 22 and 23 are the universal joint 2
connected by 4. This universal joint 24 is formed as follows. That is, two arms 25° 26 extending from the flange 22 to the outer part of the reinforcing ring 21 are provided diametrically opposite each other, and two arms 27° 28 are similarly provided from the flange 23 (the arms 28 are shown in the figure). (not shown). Each arm 25, 26.27.2
8 are provided with a phase difference of 90 degrees. A ring 29 is inscribed inside each arm 25, 26, 27, 28, and this ring 29 and each arm 25
26, 27, and 28 are rotatably connected by four pins 30 arranged on mutually orthogonal axes.

Then, connect each of these pins 30 to each arm 25.26.2.
Each arm 25.
26, 27, 28, that is, each coupling 16, 17 is formed to be able to move freely in the axial direction within a certain range relative to each other.

Next, the operation of this embodiment will be explained using FIG. 1, FIG. 3, and FIG. 4.

Piping 14 connected by pipe joint 13 of this embodiment
．． When an external axial force is applied between 15 and 15, the bellows 18
Since the universal joint 24 is formed to be expandable and contractible in the axial direction, the pipe joint 13 also expands and contracts to absorb external force. Excessive contraction of the bellows 18 is prevented by the reinforcing rings 21 being sandwiched within the seven adjustment langes 19, 20 and brought into close contact with each other.

In addition, over-extension of the bellows 18, as shown in FIG.
Each arm 25.26, 27.28 and ring 29 long hole 3
This is prevented by blocking the relative movement of 1 and 32 with the pin 30.

In addition, when an external force is applied that changes the connection angle of the pipes 14 and 15, the bellows 18 is bendable and the universal joint 24 is rotatable around each pin 30, so that the pipe joint The connection angle of the couplings 16 and 17 of 13, ie, the pipes 14 and 15, changes to absorb external force.

As shown in FIG. 3, for example, the coupling 16
and 17 rotate in the direction of the arrow in the figure about an axis perpendicular to the plane of the paper, each reinforcing ring 21 is attached to the adjusting 7 langes 19 and 20.
Since the bellows 18 is held in close contact with the bellows 18, any further increase in angle is prevented, and excessive bending of the bellows 18 is prevented.

Further, when an external force in the axial direction and an external force that changes the connection angle act in a complex manner at the same time, the above-mentioned expansion/contraction and angle change occur simultaneously in the pipe joint 13 portion to absorb the external force.

If the external force acting on the connection is greater than the force that can be absorbed by one pipe joint 13, multiple pipe joints are connected between the pipe supports 33 and 34, as shown in FIG. 5(a). 13 in series and connect the pipes 14 and 15 to disperse and absorb external force. For example, if a large earthquake causes large relative displacement in the horizontal or vertical direction,
As shown in FIG. 3B, each pipe joint 13 causes axial displacement and angular displacement within a permissible range, thereby making it possible to absorb a large external force. As a result, the pipe 14
．． 15 and piping supports 33 and 34, and safety is maintained.

〔Effect of the invention〕

In this way, the pipe joint of the present invention prevents the bellows from expanding or contracting excessively.
Since it is possible to cause a large relative displacement of opposing piping without bending, etc., and also to allow high-pressure fluid to flow, the piping can be designed with excellent earthquake resistance.

[Brief explanation of drawings]

1 to 5 show an embodiment of the pipe joint of the present invention,
Figure 1 is a cross-sectional view of the pipe joint, Figure 2 is an enlarged view of section A in Figure 1, Figure 3 is a cross-sectional view of the pipe joint at angular displacement, and Figure 4 is Figure 1 A at axial displacement. Enlarged sectional view of the section, Fig. 5(a)(b)
is a schematic diagram when piping is connected using many pipe fittings,
Figure 6(a) is a configuration diagram showing the adjacency of the reactor building and turpin building in a nuclear power generation nuclear coupler plant, and Figure 6(b)
)(C) is a configuration diagram showing the changing state of the reactor building and turpin building during a major earthquake, and Figure 7(a) is a schematic cross section showing the supporting state of the piping installed between the reactor building and turpin building. Figures 1 and 2 (b) and (c) are schematic cross-sectional views showing the state of deformation of the piping due to the occurrence of the same major earthquake. 13... Pipe joint, 16.17... Coupling, 1
8... Bellows, 21... Reinforcement ring, 24 River universal joint, 30... Pin, 31... Long hole. Applicant's Representative Kiyoshi Inomata Figure 2 Figure 3 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. Opposing tubular couplings are interconnected by a bellows, and a plurality of reinforcing rings are provided around the outer periphery of the bellows to reinforce the bellows and limit the contracted length of the bellows to a certain range, and further A pipe joint formed by connecting the above-mentioned couplings in a flexible manner by a universal joint that is axially movable within a certain range. 2. The plurality of reinforcing rings are in close contact with each other to limit the contracted length of the bellows, and the universal joint is formed to be movable in the axial direction by passing pins arranged on orthogonal lines through long holes in the axial direction. The pipe joint according to claim 1, characterized in that: