JP2012036950A - Flange bolt part sealing implement and sealing method of flange coupling part using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flange bolt part sealing implement which has a simple constitution and prevents the leakage of fluid from a bolt hole of a flange coupling part of a fluid pipe.SOLUTION: The flange bolt part sealing implement J can be attached to the flange coupling part A in which a pair of flanges 50f and 50f provided at ends of a pair of fluid pipes 50 and 50 are nipped between and fixed by flange bolts 40 and nuts 41 engaged with the flange bolts 40 so as to be threaded, and the flange bolt part sealing implement J includes: a pair of sealing means S and S which are constituted of cylindrical recessed bodies 21 and 22 having bottoms and assembled so as to cover a head 40f side and a nut 41 side of the flange bolt 40 engaged with the nut to be threaded so as to nip the pair of flanges 50f and 50f; and pressing means P pressing the pair of sealing means S and S in a direction in which the pair of flanges 50f and 50f are nipped.

Description

  The present invention relates to a flange bolt portion that can be attached to a flange joint portion in which a pair of flanges provided at respective end portions of a pair of fluid pipes are sandwiched and fixed by a flange bolt and a nut screwed to the flange bolt. The present invention relates to a sealing jig and a flange joint portion sealing method using the flange bolt part sealing jig.

  As a method of connecting a plurality of fluid pipes to each other, there is known a joint method in which a pair of flanges provided at respective ends of a pair of fluid pipes are sandwiched and fixed by a flange bolt and a nut screwed to the flange bolt. It has been. In such a flange coupling method, in order to prevent fluid leakage from between the pair of flanges, it is common to insert a packing or a seal member between the pair of flanges.

  The packing and the seal member as described above are pressed by sandwiching a pair of flanges by a flange bolt and a nut screwed to the flange bolt, and are brought into close contact with the pair of flanges. As a result, the generation of a gap between the pair of flanges is suppressed, and the fluid is prevented from leaking from between the pair of flanges. However, if the packing or the seal member is deteriorated or damaged, the fluid flowing through the fluid pipe may leak to the outside.

  Patent Document 1 describes a device for preventing leakage of fluid from the outer peripheral surface of a flange joint portion. FIG. 3 is a view showing a method of sealing a flange joint part described in Patent Document 1. As shown in FIG. As shown in FIG. 3, in the method described in Patent Document 1, a rubber belt 30 is wound around the outer peripheral surface of the flange joint A in order to prevent leakage of fluid from the flange joint A of the fluid pipe 50. . Further, a metal band 31 is wound around a position corresponding to the outer peripheral side of each of the pair of flanges 50 f on the outer periphery of the wound rubber belt 30, and the band 31 is tightened by the tightening portion 32.

Even if the leakage of fluid from between the pair of flanges 50f through the outer peripheral surface of the flange joint portion A can be prevented as described in Patent Document 1, the fluid from which leakage from the pair of flanges is prevented is prevented. There is a possibility of leakage from the head side or the nut side of the flange bolt through the bolt hole into which the flange bolt is inserted.
Therefore, as described above, a belt formed of an elastic body such as rubber is wound around the outer peripheral surfaces of the pair of flanges, and after tightening the outer periphery with a metal band, a sealing agent is further interposed between the pair of flanges. A method for preventing leakage of fluid from the bolt hole of the flange joint portion by injecting and solidifying the sealant by leaking from the bolt hole into which the flange bolt for inserting and fastening the pair of flanges is inserted is proposed. (For example, see Patent Document 2)

JP-A-7-243666 JP-A-5-44885

  When fluid leaks from between the flanges, the fluid pipe itself is often replaced. Therefore, when it repairs with a sealing agent as described in the said patent document 2, when replacing | exchanging a fluid pipe | tube after that, there exists a problem that it takes time to peel off the sealing agent inject | poured for repair. Therefore, for example, there has been a demand for a sealing jig that can easily prevent fluid leakage from the bolt hole of the flange joint portion even temporarily, and a sealing method using the jig.

  The present invention has been made in view of the above problems, and its object is to provide a flange bolt part sealing jig capable of preventing leakage of fluid from a bolt hole of a flange joint part of a fluid pipe with a simple configuration, and An object of the present invention is to provide a flange joint portion sealing method that can easily prevent fluid leakage from a bolt hole of a flange joint portion of a fluid pipe using the flange bolt portion sealing jig.

In order to achieve the above object, the flange bolt part sealing jig according to the present invention is characterized in that a pair of flanges provided at respective ends of a pair of fluid pipes are screwed into the flange bolt and the flange bolt. It can be mounted on a flange joint that is sandwiched and fixed by a nut.
A pair of seals configured by a concave body having a concave portion and mounted so as to cover each of the head side and the nut side of the flange bolt in a state of being screwed so as to sandwich the pair of flanges. Means,
And a pressing unit that presses the pair of sealing units in a direction to sandwich the pair of flanges.

According to the above characteristic configuration, the pair of sealing means is pressed by the pressing means in a direction to sandwich the pair of flanges in a state of covering each of the head side of the flange bolt and the nut side screwed to the flange bolt. The Here, “pressed” means not only positively pressing the concave body toward the flange side for sealing, but also maintaining the concave body in a certain sealing state at that position. In addition, the “pinching direction” is a direction in which a pair of flanges are close to each other and a seal is achieved.
That is, the concave body constituting one sealing means adheres closely to the flange surface while covering the head side of the flange bolt with the concave portion, and the concave body constituting the other sealing means covers the nut side with the concave portion. Adheres closely to the flange surface. As a result, the surrounding space on the head side of the flange bolt formed by the concave portion of the concave body of one sealing means and the one flange surface is kept airtight, and the concave portion of the concave body of the other sealing means and the other Since the surrounding space on the nut side formed by the flange surface is kept in an airtight state, leakage of fluid from the bolt hole can be prevented without injection of a sealing agent as in the prior art.
Therefore, it is possible to provide a flange bolt portion sealing jig that can prevent fluid leakage from the bolt hole of the flange joint portion of the fluid pipe with a simple configuration.

  Another characteristic configuration of the flange bolt part sealing jig according to the present invention is that when the concave body is pressed against the flange at the peripheral edge portion of the pair of sealing means on the opening side of the concave body. A soft member capable of being in close contact with both the peripheral edge and the flange is provided.

  According to the above characteristic configuration, when the concave body is pressed against the flange, the peripheral edge of the opening of the concave body is in close contact with the soft member, and the soft member is in close contact with the flange. That is, the gap between the concave body and the flange is filled with the soft member. As a result, the surrounding space on the head side of the flange bolt and the surrounding space on the nut side are surely kept in an airtight state, so that leakage of fluid from the bolt hole can be prevented.

Still another characteristic configuration of the flange bolt part sealing jig according to the present invention is such that the pair of sealing means covers the bottomed cylindrical first concave body covering the head side of the flange bolt and the nut side. It is composed of a bottomed cylindrical second concave body,
The depth of the concave portion of the second concave body is formed deeper than the depth of the concave portion of the first concave body.

When sandwiching and fixing a pair of flanges with a flange bolt and a nut screwed to the flange bolt, if a flange bolt with a long flange foot is used in advance, the flange bolt foot toward the nut side is used. The extension length of may be relatively long.
Even in such a case, according to this characteristic configuration, the depth of the concave portion of the bottomed cylindrical second concave body that covers the nut side is set to the bottomed cylindrical first shape that covers the head side of the flange bolt. Measures are taken to ensure that the nut and the foot of the flange bolt extending to the nut side are securely accommodated in the recess of the second concave body, which is formed deeper than the depth of the concave portion of the first concave body. As a result, even if the extension length of the flange bolt foot to the nut side becomes relatively long, the second concave body covers the nut and the flange bolt foot portion extending to the nut side while covering the flange surface. Can adhere to.

  Still another characteristic configuration of the flange bolt part sealing jig according to the present invention is that the pressing means is constituted by a vise mechanism formed in a shrimp vise shape.

  According to the above characteristic configuration, the pair of seals in the direction of sandwiching the pair of flanges by mounting the pair of seal means on the pair of flanges by the vise mechanism formed in the shape of a giant clam that constitutes the pressing unit. The means can be pressed. Further, by loosening the vise mechanism, the flange bolt part sealing jig can be easily removed.

The characteristic configuration of the sealing method of the flange joint according to the present invention is as follows:
Winding a strip around the outer peripheral surface of the flange joint, and
Using the flange bolt part sealing jig of any one of the above characteristics, the pair of sealing means is mounted so as to cover the head side and the nut side of the flange bolt, and the pressing means, And a step of pressing the pair of sealing means in a direction to sandwich the pair of flanges.

  According to the above-mentioned characteristic configuration, using the belt-shaped body and the flange bolt part sealing jig that can be easily attached to and detached from the flange joint part, fluid leakage from between the pair of flanges, and between the flange bolt or nut and the flange, The leakage of fluid can be prevented.

It is sectional drawing which shows the use condition of a flange bolt part sealing jig. It is a perspective view which shows the use condition of a flange bolt part sealing jig. A diagram showing a conventional flange joint sealing method

Hereinafter, a configuration of a flange bolt part sealing jig according to the present invention and a flange joint part sealing method using the same will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a usage state of the flange bolt part sealing jig J, and FIG. 2 is a perspective view showing a usage state of the flange bolt part sealing jig J.
As shown in FIGS. 1 and 2, the flange bolt part sealing jig J according to the present invention includes a pair of flanges 50 f and 50 f provided at the respective ends of the pair of fluid pipes 50 and 50. It can be mounted on a flange joint A that is sandwiched and fixed by a nut 41 screwed into the flange bolt 40. The fluid pipe 50 is a pipe for transporting a fluid such as gas or water. In the flange joint portion A, a packing 51 made of an elastic body or metal is interposed between the pair of flanges 50f and 50f. As a result, fluid leakage from between the pair of flanges 50f, 50f is prevented.

The flange bolt part sealing jig J includes a pair of sealing means S, S and a pressing means P.
The sealing means S is composed of concave bodies 21 and 22 having concave portions 21s and 22s. For example, the concave bodies 21 and 22 are made of metal. Specifically, of the pair of concave bodies as the pair of sealing means S, S, one first concave body 22 is a flange in a state of being screwed with the nut 41 so as to sandwich the pair of flanges 50f, 50f. The bolt 40 is mounted so as to cover the head 40h side with the concave portion 22s, and the other second concave body 21 is a nut 41 in a state of being screwed with the flange bolt 40 so as to sandwich the pair of flanges 50f, 50f. (The side of the foot 40f of the flange bolt 40 extending from the nut 41 and the nut 41) is attached so as to be covered with the recess 21s.

As described above, inside the first concave body 22, there is a concave portion 22 s that can accommodate the head 40 h side of the flange bolt 40. The recess 22s is formed in a bottomed cylindrical shape. For example, a cylindrical shape or a polygonal cylindrical shape can be adopted as the cylindrical shape of the recess 22s. Moreover, the cylindrical shape formed in the taper shape which one side taper may be sufficient. The cross-sectional shape orthogonal to the depth direction of the recess 22s may be any shape as long as the head 40h of the flange bolt 40 can be accommodated. For example, the cross-sectional shape orthogonal to the depth direction of the concave portion 22s of the first concave body 22 may be a circular shape, or when the head 40h of the flange bolt 40 is a hexagon, a hexagon corresponding thereto is used. There may be.
Similarly, there is a recess 21 s inside the second concave body 21 that can accommodate the nut 41 side. The recess 21s is also formed in a bottomed cylindrical shape. The cross-sectional shape orthogonal to the depth direction of the recess 21s may be any shape as long as the nut 41 can be accommodated. For example, the cross-sectional shape orthogonal to the depth direction of the concave portion 21s of the second concave body 21 may be a circle or a hexagon.

The peripheral portion 22r on the opening side of the first concave body 22 is provided with a soft member 22p that can be in close contact with both the peripheral portion 22r and the flange 50f when the first concave body 22 is pressed against the flange 50f. Yes. The shape of the peripheral edge 22r may be the same as or different from the cross-sectional shape of the recess 22s described above. For example, when the cross-sectional shape of the concave portion 22s and the peripheral portion 22r are both circular, or when the cross-sectional shape of the concave portion 22s is hexagonal and the peripheral portion 22r is circular, or the cross-sectional shape and peripheral portion of the concave portion 22s. For example, both 22r may be hexagonal. By using the soft member 22p, when the first concave body 22 is pressed against the flange 50f, the peripheral edge portion 22r of the opening of the first concave body 22 is in close contact with the soft member 22p and the soft member 22p is soft. The member 22p is in close contact with the flange 50f. In other words, since the gap between the first concave body 22 and the flange 50f is filled by the soft member 22p, the fluid can be prevented from flowing between the first concave body 22 and the flange 50f. As a result, the space around the head 40h of the flange bolt 40 and the space around the nut 41 are reliably kept in an airtight state. As a material of the soft member 22p, for example, a resin material or the like can be used. When the peripheral portion 22r is circular, a generally used O-ring, packing, seal tape, etc., made of an elastically deformable material can be used as the soft member 22p.
The peripheral portion 21r on the opening side of the second concave body 21 is also provided with a soft member 21p that can be in close contact with both the peripheral portion 21r and the flange 50f when the second concave body 21 is pressed against the flange 50f. Yes. The shape and material of the soft member 21p are the same as those of the first concave body 22 described above.

As shown in the drawing, it is necessary to accommodate the head 40 h side of the flange bolt 40 inside the recess 22 s of the first concave body 22, and the nut 41 and the flange bolt are inside the recess 21 s of the second concave body 21. It is necessary to accommodate the 40 feet 40f side. Therefore, when the pair of flanges 50f, 50f are sandwiched and fixed by the flange bolt 40 and the nut 41 screwed to the flange bolt 40, the flange bolt 40 in which the foot portion 40f of the flange bolt 40 is made long in advance is used. And the extension length of the leg part 40f of the flange bolt 40 to the nut 41 side may become comparatively long.
In the present embodiment, the depth of the concave portion 21s of the second concave body 21 is formed deeper than the depth of the concave portion 22s of the first concave body 22, so that the flange bolt 40 extending to the nut 41 and the nut 41 side is formed. Measures are taken to ensure that the foot 40f is accommodated in the recess 21s of the second concave body 21. As a result, even if the extension length of the foot portion 40f of the flange bolt 40 toward the nut 41 side becomes relatively long, the second concave body 21 has the flange bolt 40 extending toward the nut 41 and the nut 41 side. It can adhere to the surface of the flange 50f while covering the foot portion 40f.

  The pressing means P is configured to press the pair of sealing means S, S in a direction to sandwich the pair of flanges 50f, 50f. In this embodiment, the pressing means P is comprised by the vise mechanism formed in the shape of a giant clam vise. Specifically, the vise mechanism as the pressing means P includes a main body portion 10, a female screw portion 11, a male screw member 12, and a handle 13. The main body 10 includes a longitudinal portion 10a and extending portions 10b and 10c that extend from both ends of the longitudinal portion 10a in a direction intersecting the longitudinal portion 10a (a direction orthogonal to the present embodiment). In the present embodiment, the main body 10 is formed in a substantially “U” shape in plan view.

  The first concave body 22 described above is attached to the extending portion 10b by, for example, welding. Accordingly, the first concave body 22 is fixed to the extending portion 10b. A female screw portion 11 is attached to the extending portion 10c by welding or the like. A spiral is cut on the inner surface of the hole of the female screw portion 11. A cylindrical male screw member 12 having a spiral cut on the outer surface is inserted into the female screw portion 11, and is configured to be screwed together. A connecting member 14 is attached to one end side of the male screw member 12. The ball receiving portion 21k provided outside the bottom portion of the above-described bottomed cylindrical second concave body 21 is connected to a link ball 14a constituting one end of the connecting member 14 so as to be relatively rotatable. Accordingly, the second concave body 21 can rotate around the axis of the male screw member 12 with respect to the extending portion 10c. A handle 13 is attached to the other end side of the male screw member 12.

  As described above, when the user of the flange bolt portion sealing jig J operates the handle 13 to rotate the male screw member 12, the second concave body 21 connected to the male screw member 12 is changed into the first concave shape. It can be moved in a direction approaching the body 22 or a direction away from the first concave body 22. That is, the pair of sealing means S and S can be attached to the pair of flanges 50f and 50f, and the pair of sealing means S and S can be pressed in the direction of sandwiching the pair of flanges 50f and 50f. Further, by loosening the vise mechanism, the flange bolt seal jig J can be easily removed.

Next, a method for sealing the flange joint portion A using the flange bolt portion sealing jig J according to the present invention will be described.
For example, when the packing 51 interposed between the pair of flanges 50f and 50f is damaged, fluid leaks between the pair of flanges 50f and 50f (that is, the outer peripheral surface A1 of the flange joint portion A). There are things to do. In such a case, in order to prevent leakage of fluid from the outer peripheral surface A1 of the flange joint portion A, a step of winding a strip around the outer peripheral surface A1 of the flange joint portion A is performed. In the present embodiment, the belt 30 formed of an elastic body such as rubber is wound around the outer peripheral surface A1 of the flange joint portion A as a band-shaped body. Further, in the present embodiment, a metal band 31 is wound around a position corresponding to the outer peripheral side of each of the pair of flanges 50 f and 50 f on the outer periphery of the wound belt 30, and the band 31 is tightened by the tightening portion 32.

  In addition, even if the leakage of the fluid via the outer peripheral surface A1 of the flange joint portion A can be prevented from being performed between the pair of flanges 50f and 50f by performing the step of winding the belt-shaped body as described above, the leakage is prevented. There is a possibility that the blocked fluid leaks from the bolt hole 52 into which the flange bolt 40 is inserted. Therefore, by using the flange bolt part sealing jig J described above, the pair of sealing means S, S are mounted so as to cover the head 40h side and the nut 41 side of the flange bolt 40, and the pressing means P The step of pressing the pair of sealing means S, S in a direction to sandwich the pair of flanges 50f, 50f is performed. As a result, the pair of sealing means S, S covers the pair of flanges 50f, 50f in a state of covering the head 40h side of the flange bolt 40 and the nut 41 side screwed to the flange bolt 40, respectively. It is pressed by the pressing means P in the sandwiching direction. That is, the first concave body 22 constituting one sealing means S is in close contact with the surface of the flange 50f while covering the head 40h side of the flange bolt 40, and the second concave body constituting the other sealing means S. 21 closely adheres to the surface of the flange 50f while covering the nut 41 side. Therefore, the space around the head 40h of the flange bolt 40 formed by the inner surface of the first concave body 22 of one sealing means S and the surface of the one flange 50f is kept airtight, and the second sealing means S Since the space around the nut 41 formed by the inner surface of the two concave body 21 and the surface of the other flange 50f is kept in an airtight state, fluid leakage from the bolt hole 52 can be prevented.

  In addition, a plurality of flange bolts 40 and nuts 41 for fastening the flange joint portion A are generally provided in a distributed manner in the circumferential direction of the flange 50f, but are fitted into the bolt holes 52 where fluid leakage has occurred. When the flange bolt part sealing jig J is mounted on the side of the head 40h of the flange bolt 40 and the side of the nut 41 screwed to the flange bolt 40, the pressure of the fluid prevented from leaking at that point The fluid may newly leak from the bolt hole 52 adjacent to the location. Even in such a case, a plurality of flange bolt part sealing jigs J according to the present invention are prepared, and sequentially attached to the flange bolts 40 and the nuts 41 corresponding to the new leakage portions as described above. Thus, fluid leakage from the bolt hole 52 of the flange joint portion A of the fluid pipe 50 can be easily prevented.

<Another embodiment>
<1>
In the said embodiment, although the press means P was comprised by the vise mechanism formed in the giant clam vise shape, this invention is not limited to such a structure. For example, it is possible to use other pressing means capable of pressing the pair of sealing means S, S in a direction approaching each other, such as including a hydraulic pressing mechanism.

<2>
In the above embodiment, the first concave body 22 is fixed and the second concave body 21 is rotatable with respect to the main body portion 10 constituting the vise mechanism as the pressing means P. On the contrary, the main body portion The second concave body 21 may be fixed with respect to 10 and the first concave body 22 may be configured to be rotatable.

  The flange bolt part sealing jig and the flange joint part sealing method using the same according to the present invention can be used to prevent leakage of fluid from the bolt hole of the flange joint part of the fluid pipe.

21 2nd concave body 21s Concave part 21p Soft member 21r Peripheral part 22 1st concave body 22s Concave part 22p Soft member 22r Peripheral part 30 Belt (band-like body)
40 Flange bolt 40h Head 40f Foot 41 Nut 50 Fluid pipe 50f Flange A Flange joint A1 Outer surface J Flange bolt seal jig P Pressing means S Sealing means

Claims (5)

A pair of flanges provided at respective ends of the pair of fluid pipes can be attached to a flange joint portion sandwiched and fixed by a flange bolt and a nut screwed to the flange bolt,
A pair of seals configured by a concave body having a concave portion and mounted so as to cover each of the head side and the nut side of the flange bolt in a state of being screwed so as to sandwich the pair of flanges. Means,
A flange bolt part sealing jig comprising pressing means for pressing the pair of sealing means in a direction to sandwich the pair of flanges.   A soft member that can be in close contact with both the peripheral edge and the flange when the concave body is pressed against the flange is provided at the peripheral edge of the pair of sealing means on the opening side of the concave body. The flange bolt part sealing jig of Claim 1 currently provided. The pair of sealing means is composed of a bottomed cylindrical first concave body covering the head side of the flange bolt and a bottomed cylindrical second concave body covering the nut side,
The flange bolt part sealing jig according to claim 1 or 2, wherein a depth of the concave portion of the second concave body is formed deeper than a depth of the concave portion of the first concave body.   The flange bolt part sealing jig as described in any one of Claims 1-3 comprised with the vise mechanism in which the said press means was formed in the giant clam vise. Winding a strip around the outer peripheral surface of the flange joint, and
Using the flange bolt part sealing jig according to any one of claims 1 to 4, the pair of sealing means is mounted so as to cover each of the head side and the nut side of the flange bolt, And a step of pressing the pair of sealing means in a direction of sandwiching the pair of flanges by the pressing means.

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