JPH07190264A - Clamp chain piping joint - Google Patents

Abstract

PURPOSE:To improve remote controllability by providing a guide flange which contains a chain-like fastening mechanism which connects a clamp to a clamp plate, and arranging the guide flange movably in an axial direction with respect to one piping. CONSTITUTION:Conical flanges 1a, 2a are respectively formed on ends of pipings 1, 2. A gasket 3 is arranged between the opposed flanges 1a and 2a. Clamp groups 4 are arranged so as to fit to conical portions of the flanges 1a, 2a. A guide flange 5 housing the clamp group 4 is slidably engaged with an outer periphery 1b of the piping 1. A projection 5e is formed on an end of the guide flange 5 so as to be moved by a remote control device, while a projection 1c is formed on the piping 1. The guide flange 5 is moved by attracting the projections. A clamp chain is not necessarily detached in every installation, and can be kept attached. Installation operation is simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp chain type pipe joint, and more particularly to a clamp chain type pipe joint suitable for a device that requires remote operation and in which a pipe group needs to be attached and detached.

[0002]

2. Description of the Related Art A nuclear facility or a future fusion facility is accompanied by neutron generation as it is operated and is in a radiation-resistant atmosphere, so that it is necessary to perform remote operation for the safety of a human body during maintenance and inspection. When the repair occurs, the equipment will be removed, but it will also be necessary to remove the cooling fluid pipe for cooling the equipment. This pipe group is applied to a pipe joint for easy remote attachment and detachment.

In a nuclear fusion device, it is used as a cooling water pipe for a blanket. It can be used for piping of general equipment.

As a means for mechanically fastening pipes, a method is generally used in which a flange or the like is attached to the pipe end, a gasket is interposed between the opposing flanges, and the fluid is sealed by tightening with bolts or the like from the outside of the flange. Is. However, this flange fastening method is a method in which a plurality of bolts, nuts and the like are mounted one by one, and the nut screws are inserted, rotated and tightened, which is not suitable for remote operability.

As another method, there is a bite type joint, but when the pipe has a large diameter, the tightening force becomes excessive, and the indentation due to the bite remains, and there is a difficulty in re-establishment. It is incompatible with the condition for sex.

[0006]

As a means for attaching and detaching a pipe, a welding method is generally known in which the end of the pipe is welded and cut at the time of disassembly.

In a radiation-resistant atmosphere, it is necessary to attach / detach by remote control, and it is important that this operation is simple and the reliability of the seal is maintained.

A clamp chain type pipe joint is effective for this purpose. A flange with a cone-shaped outer periphery is attached to the pipe joint end, the flanges are made to face each other, a gasket is interposed therebetween, a clamp is fitted to the cone-shaped portion, and a plurality of these clamps are connected to form a chain, Attach a tightening bolt between the two clamps,
It is a mechanism that transmits a force between the flanges by tightening and compresses the gasket to seal the fluid.

Conventionally, this clamp chain is manually
It was a method of wrapping around the flange and tightening the tightening bolt manually to seal.

An object of the present invention is to improve remote operability by the clamp chain type pipe joint.

[0011]

In order to improve the remote operability, it is effective to simplify the operation method and reduce the operation procedure.

In the present invention, the mechanical parts other than the gasket are left attached to the pipe end, and the attaching / detaching operations are the mounting of the gasket, the alignment and joining of the opposite pipe ends, the axial movement of the clamp chain mechanism product, This is a simple operation, such as rotation of one tightening bolt makes it possible to fasten the pipe joint by four operations.

A concrete structure is that a guide flange is provided so as to include a clamp chain-like mechanism, and the guide flange is slidable on one end of the pipe.

The open state is maintained by attaching a leaf spring to the clamp, pushing the adjacent clamp to the inner circumference of the guide flange by the force of the leaf spring, rotating the tightening bolt, and further opening the clamp. Made it possible.

[0015]

[Function] The closed state means a sealed state. By tightening the conical flanges facing each other at the pipe end, the clamps that connect the clamps that are divided into multiple parts and the clamp plate that connects the clamps are joined with pins to form a chain shape. To form.

The upper part of the clamp is further divided into two parts, and tightening bolts are mounted between them to form one ring, which is collectively referred to as a clamp chain.

The trapezoidal portion of this clamp and the cone-shaped flange fit together, and the tightening bolt is rotated,
A force can be transmitted between the cone-shaped flanges to tighten the gasket and seal.

The open state means that the seal is opened and the space between the pipes is removed, and the clamp chain mechanism starts to open by rotating the tightening bolt of the clamp chain.

Next, when the tightening bolt is further rotated to further widen the space between the upper clamps, the clamps other than the leaf springs are extended to the inner circumference of the guide flange, but the clamps having the leaf springs are cone-shaped. Stays in contact with the flange.

When the space between the upper clamps is further widened by the tightening bolts, the circumferential length between the chain-shaped pins increases, and the clamps to which the leaf springs are attached start to open.

When the tightening bolt is fully opened, the clamp chain comes into contact along the inner circumference of the guide flange, and the opened state can be maintained.

Without this leaf spring, the upper clamp to which the tightening bolt is attached opens, but assuming that the other clamps do not move in contact with each other, the pin position angle between the clamp plate and the clamp becomes small, and The force of the attached bolt is required strongly, and if the pin position angle is reversed, the other clamps will not open.

The action of this leaf spring is that in the tightening process, the clamp to which the leaf spring is attached first moves in the closing direction and comes into contact with the cone-shaped flange (first three-point contact in the figure), and further tightening causes the other clamps to close. Move in the direction and tighten. This allows the cone-shaped flange to be tightened on average even with a chain-shaped clamping mechanism.

As for the movement in the axial direction, the guide flange is fitted to the tube on one side, and the projections are pulled toward each other, whereby the movement in the axial direction becomes possible.

Guide pins are provided for circumferential positioning in the form of a clamp chain.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments of the drawings.

The reference numerals of the parts are the same in the respective drawings, and the reference numerals for explaining the operation are according to the respective drawings.

FIG. 1 shows a cross section of a clamp chain type pipe joint in the pipe axis direction, and a cone-shaped flange 1 is provided at the end of the pipe 1.
a is provided, and the opposing pipe 2 is also provided with a cone-shaped flange 2a. A gasket 3 is interposed between the flanges 1a and 2a facing each other, and a clamp group 4 that fits into the cone-shaped portions of the flanges 1a and 2a is provided. The clamp group 4 is housed in a guide flange 5. The guide flange 5 is slidably fitted on the outer periphery 1b of the pipe 1. In order that the guide flange 5 can be moved by a remote control device, a protrusion 5a is provided on the end of the guide flange 5, and a protrusion 1c is also provided on the pipe 1, and the guide flange 5 is moved by pulling between the protrusions.

A guide pin 6 is provided to prevent rotation of the clamp chain. FIG. 2 is a radial cross-sectional view taken along the line AA of FIG. The clamp group 4 is divided into a plurality of
There are a clamp 8 having a tightening bolt 7 and a clamp 9, and a clamp 10 having a leaf spring 12 and a leaf spring 12
There is a clamp 11 without. There are a clamp plate 13 for connecting the clamp group 4 and a connecting pin 14, and the plate spring 12
The support pin 15 is fixed by a holding plate 16.

FIG. 3 shows an opened state with respect to FIG.

Reference numerals and component configurations are the same as in FIG.

The clamp group 4 is in an open state, the projections 5a and 1c are pulled together, and the guide flange 5 slides on the sliding portion 1b of the pipe to move. The pipe 2 and the gasket 3 are separated.

FIG. 4 is a radial cross-sectional view taken along the arrow BB in FIG.

The reference numerals and parts construction are the same as in FIG.

The clamp group 4 is opened by rotating the tightening bolt 7 and expanding the clamps 8 and 9.

FIG. 5 is a diagram showing a process of opening and closing a chain-like structure in which the clamp group 4 is connected.

Reference numerals and component configurations are the same as those in FIG.

Since the processes in the opening direction and the closing direction are the same, the opening direction will be described. When the tightening bolt 7 is rotated and the space between the clamps 8 and 9 is widened, the clamps 8, 9, 11
Is in contact with the inner circumference of the guide flange 5, and the clamp 10 is kept in contact with the cone-shaped flanges 1a and 2a by the leaf spring 12. When the tightening bolt 7 is further rotated, the clamp chain (clamp group 4 and clamp plate 13, connecting pin 4, leaf spring 12, support pin 15, leaf spring retainer plate 1
6 is a general name) and the connecting perimeter becomes large, and the clamp 10 also begins to spread.

[0039]

According to the above-described clamp chain type pipe joint of the present invention, it is not necessary to remove the clamp chain for each attachment / detachment, and the clamp chain can be left attached to the pipe, so that the attachment / detachment operation is simplified.

Further, it is generally not easy to hold the chain-like connected parts along the inner circumference, and the effect of the leaf spring enables the holding along the inner circumference to open and close the clamp chain. Made easy.

Since the guide flange and the leaf spring are additionally provided, remote operability is simplified and it is possible to contribute to the attaching / detaching operation.

[Brief description of drawings]

FIG. 1 is a sectional view in a pipe axis direction showing a sealed state of a clamp chain type pipe joint.

FIG. 2 is a radial cross-sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view in the pipe axis direction with a clamp chain type pipe joint opened.

FIG. 4 is a radial cross-sectional view taken along the line BB of FIG.

FIG. 5 is a radial cross-sectional view showing the intermediate state of opening and closing of FIGS. 2 and 4.

[Explanation of symbols]

1b ... Pipe sliding surface, 1c ... Piping protrusion, 4 ... Clamp group, 5 ... Guide flange, 5a ... Guide flange protrusion, 7 ... Tightening bolt, 12 ... Leaf spring, 13 ... Clamp plate, 15 ... Support pin , 16 ... Presser plate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasushi Imura 3-2-2, Saiwaicho, Hitachi-shi, Ibaraki Hitachi New Clear Engineering Co., Ltd. (72) Inventor Yoshihiro Ozawa San-cho, Hitachi, Ibaraki 1-1-1, Hitachi Ltd., Hitachi Works (72) Inventor, Kiyoshi Shimonuma Kiyoshi Shibanuma, Naka-cho, Naka-gun, Ibaraki Prefecture, No. 80, Mukaiyama, Japan 1 Atomic Energy Research Institute, Naka Institute (72) Inventor, Satoshi Kakudate, Naka-gun, Ibaraki Prefecture Nakacho-majuku Mukaiyama No. 801 No. 1 at the Japan Atomic Energy Research Institute Naka Research Institute (72) Inventor Kiyoshi Oka No. 1 Nakajima-cho Naka-cho, Ibaraki Prefecture No. 80 Mukaiyama No. 1 Japan Atomic Energy Research Institute Naka Research Institute (72) Inventor Naokane Kanamori Ibaraki No. 80, Mukayama, Naka-cho, Naka-gun, Nagano Prefecture

Claims (2)

[Claims] 1. A pipe joint having a cone-shaped outer periphery, a gasket interposed between opposed flanges, and a chain-shaped tightening mechanism in which a clamp and a clamp plate divided into the outer periphery of the cone-shaped flange are connected to each other, A guide flange including a chain-like tightening mechanism that connects the clamp and the clamp plate is provided, the guide flange is axially movable to one pipe, and two cone-shaped flanges are tightened by a single bolt. Clamp chain type pipe joint with a mechanism that makes it easy to attach and seal fluid. 2. The pipe joint according to claim 1, wherein a leaf spring is additionally provided on a chain-shaped mechanism that connects a plurality of clamps and clamp plates, and the chain-shaped mechanism is contacted along the inner circumference of the guide flange. Clamp chain type pipe joint characterized in that it is possible to hold the linear mechanism in the open state.