JPH07310874A - Gasket fixing device in flange and fixing method therein - Google Patents

Abstract

PURPOSE:To enable a gasket to be fixed on a flange contact surface on one side without slipping off even in clamping of flanges provided with no leak groove in clamping of the flanges in connecting of high-pressure pipes having the large aperture, and also to reduce processing costs. CONSTITUTION:A fixing device is composed of knock pins 5 to be screwed to clamping screw holes 2 faced to each other on the center line of a flange 1, and gasket presser members 6 to be attached between the knock pins 5 and the outer peripheral side surface of a metallic gasket 3 to be fixed on the contact surface with the flange 1. When a counterpart side flange is clamped to the flange 1 on one side, the knock pins 5 are screwed into the clamping screw holes 2 faced to each other on the center line of the flange 1, and the gasket presser 6 is attached between the knock pins 5 and the outer peripheral side surface of the metallic gasket 3, and the metallic gasket 3 is pressed and fixed by the gasket presser members 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket fixing device and a fixing method for a flange, and more specifically, when a flange is fastened when connecting a high pressure pipe or the like having a large diameter, a gasket is attached to the flange of one pipe. The present invention relates to a gasket fixing device and a fixing method for a flange that can be fixed so as not to fall off.

[0002]

2. Description of the Related Art Generally, a flange is provided at each connecting end of a pipeline, and when connecting both pipelines via this flange, a packing or gasket is interposed on the joint surface of the flange. The airtightness is maintained by fastening several bolts around the flange.

By the way, since a flange diameter is large and a weight is large when connecting a high-pressure pipe having a large diameter, it is a heavy burden for an operator to fasten the flanges with each other through a gasket.

A metal gasket made of copper or the like is generally used as a gasket to be interposed on the flange mounting surface, and it is slippery on the flange mounting surface.

Therefore, when the high-pressure pipe is piped in the horizontal direction, the mounting surface of the flange becomes vertical and the gasket cannot be fixed on one side of the flange. Therefore, manual work is required until the mating flange is assembled. Therefore, one of the flanges must hold the gasket, but as mentioned above, the flange itself has a considerable weight, and the gasket is slippery on the flange mounting surface, so the workability of pipe connection work is poor and extremely troublesome. It was a lot of work.

Therefore, conventionally, when a high-pressure pipe or the like having a large diameter is piped in a horizontal direction or a downward direction, the metal gasket is fixed to the vertical or downward flange mounting surface as shown in FIG. A commercially available gasket clip 20 as shown was used.

The gasket / clip 20 is made of an elastic material such as a piano wire or a leaf spring, and is formed by an end portion 2 thereof.
1, 22 are formed in a substantially U-shape that can be expanded, and one end 21 is fitted with a leak groove (leak searching groove) 26 formed on a joint surface of a flange 24 at a pipe end. A pressing portion 21 a that presses the surface of the metal gasket 28 is formed.

In the above structure, when the metal gasket 28 is fixed to the joint surface of the flange 24 by the above-mentioned conventional gasket clip 20, one end 21 of the gasket clip 20 is formed on the joint surface of the flange 24. The metal gasket is fitted into the leak groove 26 formed therein, the pressing portion 21a presses the surface of the metal gasket 28, and the other tip 22 is locked to the back surface of the flange 24 holding the metal gasket 28. 28 is fixed to the joint surface of the flange 24. The gasket clip 20 is pulled out before the mating flange 30 is assembled and the fastening bolt 32 is completely tightened.

[0009]

However, the flanges that can be used with the above-mentioned conventional gaskets and clips are limited to those in which two opposing leak grooves are formed on the center line of the flange joint surface. There is a problem that it cannot be used for flanges without grooves.

Further, the gasket clip has a problem that the processing cost becomes high because the pressing portion for pressing the gasket must be processed at the tip portion.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to prevent leakage at the time of fastening a flange when connecting a high-pressure pipe having a large diameter. An object of the present invention is to provide a gasket fixing device and a fixing method for a flange in which the gasket can be fixed to one flange joint surface so as not to fall off even when the flanges without grooves are fastened and the processing cost is low. Is.

[0012]

In order to achieve the above object, the gasket fixing device in the flange of the present invention comprises:
A knock pin that is screwed into a fastening screw hole facing the flange, and a gasket pressing member that is mounted between the knock pin and the outer peripheral side surface of the gasket that is fixed to the joint surface of the flange are provided. A pressing spring formed of an elastic body in an arc shape, and a grip portion connected to an intermediate portion of the pressing spring are provided.

Further, in the method for fixing a gasket on a flange according to the present invention, when the gasket is fastened to the flange, a knock pin is screwed into a fastening screw hole facing the flange so that the knock pin and the outer peripheral side surface of the gasket are provided. A gasket pressing member having an elastic force is attached to the above, and the gasket is pressed and fixed by the elastic force of the gasket pressing member.

[0014]

When the mating flange is fastened to the flange based on such a configuration, a knock pin is screwed into the fastening screw hole facing the center line of the flange, and the knock pin is fitted between the knock pin and the outer peripheral side surface of the gasket. The pressing spring of the gasket pressing member can be mounted and the gasket can be pressed and fixed by this pressing spring.

With the gasket fixed to the joint surface of the flange, the knock pin is inserted into the fastening screw hole of the mating flange for positioning, and the other fastening screw holes except the position of the knock pin are fastened. Not only can the bolts be tightened, but after the knock pins are removed, the fastening bolts can be screwed to the positions of the knock pins, so that all the fastening bolts can be securely tightened.

Further, when removing the knock pin, the gasket pressing member may be pulled out from between the joint surfaces of the flanges by holding the grip portion.

Therefore, according to the present invention, the gasket can be easily fixed to the joint surfaces of all the flanges as well as the one having no leak groove on the joint surface of the flange, and the knock pin is used. Positioning is easy when assembling the side flanges, and heavy piping connection work can be performed easily.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a gasket fixing device and fixing method for a flange according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a front view showing a gasket fixing device and a fixing method for a flange according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a first embodiment of the present invention. 4 (a) and 4 (b) are perspective views of a knock pin according to the present invention.

A plurality of (eight in the embodiment) screw holes 2 for fastening are provided at equal intervals in a flange 1 used for high-pressure vacuum piping or the like, and a metal is attached to a joint surface of the flange 1. The gasket 3 is interposed, and the mating flange 4 is tightened with fastening bolts to connect the pipes.

When the flange 1 has a large diameter and is heavy, the weight of the metal gasket 3 is heavy, and when the joint surface of the flange 1 is vertical, the metal gasket 3 cannot be fixed to the flange joint surface and falls. Will end up. Therefore, in order to fix the metal gasket 3 to the joint surface of the flange 1 until the mating flange 4 is assembled to the joint surface of the flange 1, two fastening screws facing each other on the center line of the flange 1 are used. A knock pin 5 is screwed into the hole 2, and the metal gasket 3 is pressed and fixed in the vertical direction in FIG. 1 through a gasket pressing member 6 mounted between the knock pin 5 and the outer peripheral side surface of the metal gasket 3.

As shown in FIG. 3, the gasket pressing member 6 includes a pressing spring 6a formed in an arc shape by an elastic body such as a piano wire or a leaf spring, and a grip portion fixed to an intermediate portion of the pressing spring 6a. 6b, and the grip portion 6b of the gasket pressing spring 6 is sandwiched by fingers so that it can be attached and detached between the knock pin 5 and the metal gasket 3.

The pressing spring 6a and the grip portion 6b of the gasket pressing member 6 can be integrally formed.

The knock pin 5 is shown in FIGS. 4 (a) and 4 (b).
As shown in FIG. 2, the driver groove 5a has the same diameter as a fastening bolt (not shown) for fastening the flanges 1 and 4 and is screwed into the fastening screw hole 2 of the flange 1 on the head.
Alternatively, a pin hole 5b for inserting the handle is formed.

Therefore, when the knock pin 5 is fixed to the fastening screw hole 2 of the flange 1, the fastening screw hole 2 of the mating flange 4 can be inserted into the knock pin 5 for positioning.

When the mating flange 4 is fastened to the flange 1 in the above construction, first, the knock pins 5 are respectively screwed into the two fastening screw holes 2 facing each other on the center line of the flange 1. The grip portion 6b of the gasket pressing member 6 is sandwiched by fingers, and the pressing spring 6a of the gasket pressing member 6 is interposed between the knock pin 5 and the outer peripheral side surface of the metal gasket 3.
Then, the metal gasket 3 is pressed by the pressing spring 6a from above and below in FIG.

Next, with the metal gasket 3 fixed to the joint surface of the flange 1, the knock pin 5 is inserted into the fastening screw hole 2 of the mating flange 4 and the other fastening screws except the position of the knock pin 5 are inserted. Tighten hole 2 with a fastening bolt. After that, the knock pin 5 is removed, and the knock pin 5
The fastening bolts are also screwed to the position of to securely tighten all the fastening bolts.

The gasket pressing spring 6 has a gripping portion 6 of the gasket pressing member 6 when the knock pin 5 is removed.
It may be pulled out from between the joint surfaces of the flange 1 and the flange 4 by sandwiching b with fingers.

FIG. 5 is a perspective view showing a mounted state of the gasket pressing member according to the second embodiment of the present invention. The gasket pressing member 7 according to the second embodiment is formed in an approximately V shape by an elastic body such as a piano wire or a leaf spring.

Therefore, when the metal gasket 3 is fixed to the joint surface of the flange 1 by the gasket pressing member 7, one knock pin 5 is screwed into the fastening screw hole 2 facing on the center line of the flange 1. A gasket pressing member 7 is provided between the knock pin 5 and the outer peripheral side surface of the metal gasket 3.
By mounting, the metal gasket 3 can be fixed by pressing in the vertical direction in FIG.

Next, the mating flange 4 can be assembled with the metal gasket 3 fixed to the joint surface of the flange 1 as in the case of the first embodiment described above. When removing the knock pin 5, hold both ends of the gasket pressing member 7 with your fingers,
It may be pulled out from between the joint surfaces of the flange 1 and the flange 4.

In the second embodiment, since the number of knock pins can be reduced, the cost can be further reduced.

FIG. 6 is a perspective view showing a mounted state of the gasket pressing member according to the third embodiment of the present invention. The gasket pressing member 8 according to the third embodiment is formed of an elastic body such as a piano wire or a leaf spring into a torsion coil spring shape having a ring portion 8a and a leg portion 8b.

Therefore, when the metal gasket 3 is fixed to the joint surface of the flange 1 by the gasket pressing member 8, one knock pin 5 is screwed into the fastening screw hole 2 facing the center line of the flange 1. The ring portion 8a of the gasket pressing member 8 is inserted into the knock pin 5, and the leg portion 8b of the gasket pressing member 8 is pressed against the outer peripheral side surface of the metal gasket 3 to mount the metal gasket 3 in the vertical direction in FIG. It can be pressed and fixed more.

Then, after the mating flange 4 is assembled with the metal gasket 3 fixed to the joint surface of the flange 1, the knock pin 5 is removed before the tightening of the fastening bolt is completed, and the gasket pressing member 8 is attached. The fastening bolts are pulled out and the fastening bolts are screwed to the positions of the knock pins 5, so that all the fastening bolts are securely tightened.

Also in the third embodiment, since the number of knock pins can be reduced, the cost can be further reduced.

The gasket pressing member according to the present invention is not limited to the above-mentioned respective embodiments, and various hairpin shapes including W-shaped and corrugated can be used as long as they are compatible with the gist of the present invention. A molded product can also be applied.

[0038]

Since the present invention is constructed as described above, it has the following effects.

The knock pin is fixed by using a plurality of fastening screw holes formed in the flange at equal intervals, and a gasket pressing member is interposed between the knock pin and the outer peripheral side surface of the gasket to form the flange. Since the gasket is fixed to the joint surface of the other side, even when fixing a gasket such as metal to a large-diameter flange that is heavy, secure the one joint surface of the flange until the mating of the mating flange is completed. Since the gasket can be fixed to the pipe, the workability of the pipe connecting work can be significantly improved.

That is, according to the present invention, even if there is no leak groove on the flange joint surface, the gasket can be securely and easily fixed to the joint surfaces of all the flanges.

Further, since the gasket pressing member can be formed by simply bending an elastic body such as a piano wire or a leaf spring, it can be manufactured at low cost without complicated machining parts.

Furthermore, since the knock pin is used,
Positioning is easy when assembling the mating flange, and heavy piping connection work can be performed easily.

[Brief description of drawings]

FIG. 1 is a front view showing a gasket fixing device and a fixing method for a flange according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a perspective view of a gasket pressing member according to the first embodiment of the present invention.

4A and 4B are perspective views of a knock pin according to the present invention.

FIG. 5 is a perspective view showing a mounted state of a gasket pressing member according to a second embodiment of the present invention.

FIG. 6 is a perspective view showing a mounted state of a gasket pressing member according to a third embodiment of the present invention.

FIG. 7 is a perspective view illustrating a method of fixing a metal gasket to a flange mounting surface using a conventional gasket clip.

[Explanation of symbols]

 1, 4 Flange 2 Fastening screw hole 3 Metal gasket 5 Knock pin 6, 7, 8 Gasket retainer

Claims (5)

[Claims] 1. A knock pin that is screwed into a fastening screw hole that is opposed to a flange, and a gasket pressing member that is mounted between the knock pin and an outer peripheral side surface of a gasket that is fixed to a joint surface of the flange. The gasket fixing device for a flange, wherein the gasket pressing member has a pressing spring made of an elastic body and a gripping portion continuously provided at an intermediate portion of the pressing spring. 2. The gasket fixing device for a flange according to claim 1, wherein the pressing spring is formed in an arc shape. 3. The gasket fixing device for a flange according to claim 1, wherein the gasket pressing member is formed of an elastic body into a substantially V shape. 4. The gasket fixing device for a flange according to claim 1, wherein the gasket pressing member is formed of an elastic body into a torsion coil spring shape having a ring portion and a leg portion. 5. When fastening the gasket to the flange,
A knock pin is screwed into the fastening screw holes facing each other on the flange, a gasket pressing member having an elastic force is attached between the knock pin and the outer peripheral side surface of the gasket, and the gasket is pressed by the elastic force of the gasket pressing member. A method for fixing a gasket on a flange, characterized in that the gasket is fixed by pressing.