WO2016114300A1

WO2016114300A1 - Gasket holder, flange joint structure, gasket-positioning member, gasket assembly, and method for manufacturing gasket assembly

Info

Publication number: WO2016114300A1
Application number: PCT/JP2016/050823
Authority: WO
Inventors: 淳内池
Original assignee: 千代田化工建設株式会社
Priority date: 2015-01-13
Filing date: 2016-01-13
Publication date: 2016-07-21

Abstract

A gasket holder (10) holds an annular gasket (12) in a predetermined position relative to two opposing flanges, the gasket being arranged between the flanges. The gasket holder (10) is provided with an annular part (20) having an inside diameter capable of accommodating the gasket (12), and a plurality of protrusions (22) protruding radially outward from the annular part (20) and arranged in intervals around the circumferential direction of the annular part (20). The length from the center of the annular part (20) to a tip part (22a) of each protrusion (22) is equivalent to the length from center to outer peripheral edge of each flange.

Description

Gasket holder, flange joint structure, gasket positioning member, gasket assembly, and method for manufacturing gasket assembly

The present invention relates to a gasket holder for holding a gasket and a flange joint structure using the gasket holder. The present invention also relates to a gasket positioning member for positioning a gasket, a gasket assembly in which the gasket positioning member and the gasket are assembled, a flange joint structure using the gasket assembly, and a method for manufacturing the gasket assembly.

Generally, when various pipes are connected by flange joints using bolts and nuts, a gasket for preventing leakage is interposed between the flanges of the pipes.

However, even when a gasket is interposed at the flange joint, leakage may occur if the gasket is not arranged at a predetermined position with respect to the flange. Therefore, in order to accurately position the gasket with respect to the flange, a technique for providing a positioning piece on the gasket has been proposed (see Patent Document 1).

JP 2004-360759 A

However, in the technique disclosed in Patent Document 1, it is necessary to manufacture a specially shaped gasket having a plurality of positioning pieces, which may increase the manufacturing cost. Further, when replacing the gasket, it is necessary to replace the entire expensive gasket, which may increase the running cost.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a gasket holder that can easily position a gasket at a predetermined position and is excellent in economic efficiency, and a flange joint using the gasket holder. To provide a structure.

In order to solve the above problems, a gasket holder according to an aspect of the present invention is a gasket holder that holds an annular gasket disposed between two opposing flanges at a predetermined position with respect to the flange. An annular portion having an inner diameter capable of accommodating the gasket, and a plurality of projecting portions that project radially outward from the annular portion and are spaced apart in the circumferential direction of the annular portion. The length from the center of the annular portion to the tip of each protrusion corresponds to the flange from the center to the outer periphery.

The inner diameter of the annular part may correspond to the outer diameter of the gasket.

The tip of the protruding portion may be formed in an arc shape centered on the center of the annular portion.

A support portion for supporting the gasket may be formed on the inner peripheral edge of the annular portion so that the center in the thickness direction of the gasket coincides with the center in the thickness direction of the annular portion.

Another aspect of the present invention is a flange joint structure. The flange joint structure is a flange joint structure including two opposing flanges, an annular gasket disposed between the flanges, and a gasket holder that holds the gasket in a predetermined position with respect to the flange. The gasket holder includes an annular portion having an inner diameter that can accommodate the gasket, and a plurality of projecting portions that protrude radially outward from the annular portion and are spaced apart in the circumferential direction of the annular portion. The length from the center of the annular portion to the tip of each protrusion corresponds to the flange from the center to the outer periphery.

The first and second gaskets may be held on the gasket holder. An orifice or a closure plate may be disposed between the first and second gaskets.

It should be noted that an arbitrary combination of the above-described components and a representation obtained by converting the expression of the present invention between a method, an apparatus, a system, and the like are also effective as an aspect of the present invention.

According to the present invention, it is possible to provide a gasket holder that can easily position a gasket at a predetermined position and is excellent in economy, and a flange joint structure using the gasket holder.

It is a disassembled perspective view of the gasket holder which concerns on 1st Embodiment of this invention, and the gasket hold | maintained at a gasket holder. Fig.2 (a) is a top view of the gasket holder which concerns on 1st Embodiment of this invention, FIG.2 (b) is a top view of the gasket hold | maintained at a gasket holder. 3A is a plan view showing a state in which the gasket is held by the gasket holder, and FIG. 3B is a cross-sectional view of the gasket holder and the gasket shown in FIG. 3A taken along the line AA. It is a figure which shows the flange joint structure which concerns on 1st Embodiment of this invention. FIG. 5 is a BB sectional view of the flange joint structure shown in FIG. 4. FIG. 6A to FIG. 6C are diagrams for explaining the flange rotation. FIG. 7A is a plan view for explaining a modified example of the gasket holder, and FIG. 7B is a CC cross-sectional view of the gasket holder and the gasket shown in FIG. 7A. It is sectional drawing for demonstrating the flange joint structure which concerns on another embodiment of this invention. It is a perspective view of the gasket assembly which concerns on 2nd Embodiment of this invention. It is a disassembled perspective view of the gasket assembly which concerns on 2nd Embodiment of this invention. FIG. 11A is a plan view of a gasket assembly according to the second embodiment of the present invention, and FIG. 11B is a cross-sectional view taken along line AA of the gasket assembly shown in FIG. . It is a figure which shows the flange joint structure which concerns on 2nd Embodiment of this invention. FIG. 13 is a BB sectional view of the flange joint structure shown in FIG. 12. FIG. 14A to FIG. 14C are diagrams for explaining the flange rotation. FIG. 15A and FIG. 15B are cross-sectional views for explaining a modification of the gasket assembly. It is sectional drawing for demonstrating the flange joint structure which concerns on another embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, and processes shown in the drawings are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate. The embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

[First Embodiment]
FIG. 1 is an exploded perspective view of a gasket holder 10 and a gasket 12 held by the gasket holder 10 according to the first embodiment of the present invention. 2A is a plan view of the gasket holder 10 according to the first embodiment of the present invention, and FIG. 2B is a plan view of the gasket 12 held by the gasket holder 10. 3A is a plan view showing a state where the gasket 12 is held by the gasket holder 10, and FIG. 3B is a cross-sectional view taken along the line AA of the gasket holder 10 and the gasket 12 shown in FIG. FIG.

First, the gasket 12 will be described. The gasket 12 is disposed between two opposing flanges. The gasket 12 of the first embodiment is a spiral wound gasket, and has an annular plate-shaped outer ring portion 14 made of a metal such as stainless steel, and an annular shape made of a filler material or the like disposed inside the outer ring portion 14. A seal portion 16 and an inner ring portion 18 made of a metal such as stainless steel disposed inside the seal portion 16 are provided. These outer ring part 14, seal part 16 and inner ring part 18 are joined and integrated.

In the first embodiment, the gasket 12 is illustrated in which the outer ring portion 14 and the inner ring portion 18 are added to the seal portion 16. However, the gasket 12 is only the seal portion 16, and the seal portion 16 has the outer ring portion 14. Only the inner ring portion 18 may be added to the seal portion 16. Moreover, although the spiral wound gasket was illustrated as the gasket 12, other types of gaskets may be used.

Next, the gasket holder 10 will be described. The gasket holder 10 holds the gasket 12 at a predetermined position with respect to the flange. By using the gasket holder 10 when attaching the gasket 12 between the flanges, the gasket 12 can be easily attached at an accurate position.

The gasket holder 10 includes an annular plate-shaped annular portion 20 and four projecting portions 22 projecting radially outward from the annular portion 20. The annular portion 20 and the protruding portion 22 are integrally formed of a metal such as stainless steel.

The annular portion 20 has an inner diameter ID that can accommodate the gasket holder 10. More preferably, the annular portion 20 has an inner diameter ID corresponding to the outer diameter of the gasket 12 (that is, the outer diameter of the outer ring portion 14) OD. Here, the inner diameter ID corresponds to the outer diameter OD means that the inner diameter ID is the same as or slightly smaller than the outer diameter OD. At this time, in a state where the gasket 12 is held by the gasket holder 10, the center C1 of the gasket holder 10 and the center C2 of the gasket 12 coincide. In this case, since the gasket holder 10 can accommodate the gasket 12 without rattling, the positioning accuracy of the gasket 12 can be increased.

The four protrusions 22 are arranged at equal intervals (that is, at intervals of 90 degrees) in the circumferential direction of the annular portion 20. The protrusion 22 has a substantially rectangular shape in plan view. The distal end portion 22 a of the protruding portion 22 may be formed in an arc shape centered on the center C <b> 1 of the annular portion 20. The four protrusions 22 are formed such that the length D1 from the center C1 of the annular part 20 to the tip 22a of each protrusion 22 corresponds to the length from the center of the flange to which the gasket 12 is attached to the outer periphery. Has been.

FIG. 4 is a plan view showing the flange joint structure 100 according to the first embodiment of the present invention. In FIG. 4, the flange 30 is illustrated by a solid line, the gasket holder 10 is illustrated by a broken line, and the gasket 12 is illustrated by a one-dot chain line. FIG. 5 is a cross-sectional view taken along the line BB of the flange joint structure 100 shown in FIG. In the flange joint structure 100, the gasket holder 10 holding the gasket 12 is interposed between two opposing flanges 30.

The flange 30 shown in FIG. 4 is a flange formed with a flat seat 32 protruding from the flange surface. Eight bolt holes 34 are formed in the flange 30 at equal intervals in the circumferential direction (that is, at intervals of 45 degrees). Bolts 35 are inserted into the respective bolt holes 34, and two flanges 30 are fastened by the bolts 35 and nuts (not shown).

When assembling the flange joint structure 100, first, the gasket 12 is held in the annular portion 20 of the gasket holder 10. Then, the gasket holder 10 holding the gasket 12 is positioned between the two flanges 30. At the time of this positioning, each projecting portion 22 of the gasket holder 10 is positioned between the adjacent bolt holes 34, and the distal end portion 22 a of each projecting portion 22 is aligned with the outer peripheral edge 30 a of the flange 30. That is, the tip 22a of the protrusion 22 and the outer peripheral edge 30a of the flange 30 are aligned on the same plane. Thereby, the gasket 12 can be positioned with respect to the flange 30 at a predetermined position, that is, a position where the center C2 of the gasket 12 and the center C3 of the flange 30 coincide. There is no need to visually adjust the position of the gasket from the narrow gap between the flanges as in the conventional case, and it is only necessary to align the tip 22a of each protrusion 22 with the outer peripheral edge 30a of the flange 30. It can be done very easily.

When the tip 22a of the protrusion 22 is formed in an arc shape centered on the center C1 of the annular portion 20, the tip 22a of the protrusion 22 and the outer peripheral edge 30a of the flange 30 can be easily aligned on the same plane. Therefore, positioning can be performed more easily.

Further, the gasket holder 10 according to the first embodiment can use an ordinary commercially available annular gasket 12. There is no need to manufacture a specially shaped gasket having a plurality of positioning pieces as disclosed in Patent Document 1. When replacing the gasket, it is only necessary to remove the gasket 12 from the gasket holder 10 and replace only the gasket 12, and the gasket holder 10 can be reused, so that the replacement range can be minimized. Thus, the gasket holder 10 according to the first embodiment is excellent in economic efficiency.

6 (a) to 6 (c) are diagrams for explaining the flange rotation. FIG. 6A shows a flange joint structure in which the bolt is normally tightened. However, in a normal flange joint structure, when the flange is wrinkled due to one-side tightening of the flange (a state where a plurality of bolts are not tightened by a uniform force) or the bolt is over-tightened, FIG. As shown in Fig. 6 (b) and Fig. 6 (c), a flange rotation occurs in which the flange rotates around the outer edge of the flat seat, and the gasket may change from a surface contact to a line contact on the outer edge side, which may cause leakage from the location. There is. Flange rotation can also occur when an external force perpendicular to the axial direction of the flange acts due to an earthquake or the like.

However, in the first embodiment, since the four projecting portions 22 are positioned between the bolts 35, when the flange is tightened or overtightened, or when an external force perpendicular to the axial direction of the flange is applied. However, the protrusion 22 resists and rotation of the flange 30 is prevented, so that leakage can be prevented in advance.

FIG. 7A is a plan view for explaining a modification of the gasket holder 10, and FIG. 7B is a cross-sectional view of the gasket holder 10 and the gasket 12 shown in FIG. is there.

In this modification, a support portion 50 that supports the gasket 12 is formed on the inner peripheral edge 20a of the annular portion 20 so that the center in the thickness direction of the gasket 12 and the center in the thickness direction of the annular portion 20 coincide. ing. The support portion 50 is a bowl-shaped body that protrudes radially inward from the inner peripheral edge 20 a of the annular portion 20. As shown in FIG. 7A, in the present modification, the support portion 50 is continuously formed over the entire circumference of the inner peripheral edge 20a of the annular portion 20, but may be formed at intervals. In addition, as shown in FIG. 7B, in this modification, the contact surface of the support portion 50 with the gasket 12 is parallel to the radial direction of the annular portion 20, but this contact surface is annular. The portion 20 may be inclined with respect to the radial direction. In this case, if the contact surface of the outer ring portion 14 of the gasket 12 is slightly inclined so as to be engaged with the contact surface of the support portion 50, an error in the height of the flat seat of the opposing flange can be absorbed.

In FIG. 3B, the center of the gasket 12 in the thickness direction and the center of the annular portion 20 in the thickness direction are drawn to coincide with each other. The position of the gasket 12 in the thickness direction is free and is not constant. As in this modification, by providing the support portion 50 on the inner peripheral edge 20a of the annular portion 20, the center of the gasket 12 in the thickness direction matches the center of the annular portion 20 in the thickness direction. A position can be defined. In this case, the gasket 12 can be more stably held in the gasket holder 10 such that the gasket 12 is less likely to be separated from the gasket holder 10 during installation.

FIG. 8 is a cross-sectional view for explaining a flange joint structure 600 according to another embodiment of the present invention. In the flange joint structure 600 shown in FIG. 8, the illustration of the flange is omitted.

As shown in FIG. 8, the flange joint structure 600 includes a first gasket 12A, a second gasket 12B, and a gasket holder 10. The gasket holder 10 holds the first gasket 12A and the second gasket 12B. Further, in the flange joint structure 600, an annular orifice 60 is disposed between the first gasket 12A and the second gasket 12B. The gasket holder 10 of the present embodiment has a larger thickness than the gasket holder shown in FIG. 1 and the like that can hold one gasket 12 in order to hold two gaskets and the orifice 60. The orifice 60 has an outer diameter corresponding to the inner diameter of the annular portion of the gasket holder 10. When the first gasket 12A and the second gasket 12B are pressed by the two flanges, the orifice 60 is held between the first gasket 12A and the second gasket 12B.

Thus, according to the flange joint structure 600 according to the present embodiment, the two gaskets and the orifice 60 can be centered by using the gasket holder 10 having an increased thickness. Furthermore, using the protrusion 22 of the gasket holder 10, the hole 60a of the orifice 60 and the center of the flange can be aligned. When installing an orifice between two gaskets, it is difficult for two workers to install two gaskets on the flange by aligning the centers of the orifices. However, according to the flange joint structure 600 according to the present embodiment, even two workers can easily install the two gaskets and the orifice at the center of the orifice on the flange.

In the flange joint structure 600, the orifice 60 is disposed between the first gasket 12A and the second gasket 12B. However, instead of the orifice 60, a closing plate (a disc in which no hole is formed) may be disposed. .

The orifice or the closed plate may be formed integrally with the gasket holder 10. In this case, the flange joint structure can be simplified.

The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to the combination of each component and each processing process, and such modifications are also within the scope of the present invention. .

For example, in the above-described embodiment, the number of the protrusions 22 is four, but the number of the protrusions 22 is not particularly limited as long as it is plural. The number of protrusions 22 is adjusted to 4 + 2N (N is an arbitrary integer and increases or decreases according to the number of bolts of the flange) according to the size and rating of the flange.

[Second Embodiment]

However, in the technique disclosed in Patent Document 1, it is necessary to manufacture a specially shaped gasket having a plurality of positioning pieces, which may increase the manufacturing cost.

In the second embodiment, there is provided a technique capable of easily and inexpensively positioning a gasket at a predetermined position.

An outline of the second embodiment will be described.
One aspect of the second embodiment is a gasket positioning member. The gasket positioning member positions an annular gasket disposed between two opposing flanges at a predetermined position with respect to the flange. This gasket positioning member consists of a plate-shaped piece. A concave portion for attaching the gasket positioning member to the outer edge portion of the gasket is formed at one end of the plate-like piece. In a state where the gasket positioning member is attached to the outer edge of the gasket, the length from the center of the gasket to the other end of the plate-like piece corresponds to the length from the center of the flange to the outer peripheral edge.

The other end of the plate-shaped piece may be formed in an arc shape centered on the center of the gasket.

Another aspect of the second embodiment is a gasket assembly. The gasket assembly includes an annular gasket disposed between two opposing flanges, and a gasket positioning member for positioning the gasket at a predetermined position with respect to the flange. The gasket positioning member is composed of a plate-like piece, and a recess for attaching the gasket positioning member to the outer edge portion of the gasket is formed at one end of the plate-like piece. In a state where the gasket positioning member is attached to the outer edge of the gasket, the length from the center of the gasket to the other end of the plate-like piece corresponds to the length from the center of the flange to the outer peripheral edge.

A plurality of gasket positioning members may be attached at intervals in the circumferential direction of the gasket.

The other end of the plate-like piece may be formed in an arc shape centered on the center of the gasket.

Still another aspect of the second embodiment is a flange joint structure. The flange joint structure includes two opposing flanges, an annular gasket disposed between the flanges, and a gasket positioning member for positioning the gasket at a predetermined position with respect to the flange. With. The gasket positioning member is composed of a plate-like piece, and a recess for attaching the gasket positioning member to the outer edge portion of the gasket is formed at one end of the plate-like piece. In a state where the gasket positioning member is attached to the outer edge of the gasket, the length from the center of the gasket to the other end of the plate-like piece corresponds to the length from the center of the flange to the outer peripheral edge.

The flange joint structure may include first and second gasket assemblies arranged in a stacked manner. An orifice or a closure plate may be disposed between the first and second gasket assemblies.

Still another aspect of the second embodiment is a gasket comprising an annular gasket disposed between two opposed flanges, and a gasket positioning member for positioning the gasket at a predetermined position with respect to the flange. It is a manufacturing method of an assembly. This method comprises a step of preparing a gasket positioning member comprising a plate-like piece, wherein a gasket positioning member having a recess formed at one end of the plate-like piece for attaching itself to the outer edge of the gasket, and gasket positioning Attaching the member to the outer edge of the gasket. In a state where the gasket positioning member is attached to the outer edge of the gasket, the length from the center of the gasket to the other end of the plate-like piece corresponds to the length from the center of the flange to the outer peripheral edge.

According to each aspect of the second embodiment, the gasket can be easily and inexpensively positioned at a predetermined position.

It should be noted that an arbitrary combination of the above-described components and a representation obtained by converting the expression of the present invention between a method, an apparatus, a system, and the like are also effective as an aspect of the second embodiment.

FIG. 9 is a perspective view of a gasket assembly 1100 according to the second embodiment of the present invention. FIG. 10 is an exploded perspective view of a gasket assembly 1100 according to the second embodiment of the present invention. FIG. 11A is a plan view of a gasket assembly according to the second embodiment of the present invention, and FIG. 11B is a cross-sectional view taken along the line AA of the gasket assembly 1100 shown in FIG. is there.

The gasket assembly 1100 includes an annular gasket 1012 disposed between two opposing flanges, and four gasket positioning members 1010 for positioning the gasket 1012 in a predetermined position with respect to the flange. .

First, the gasket 1012 will be described. The gasket 1012 of the second embodiment is a spiral wound gasket, and is an annular plate-shaped outer ring portion 1014 made of a metal such as stainless steel, and an annular shape made of a filler material or the like disposed inside the outer ring portion 1014. A seal portion 1016 and an inner ring portion 1018 made of a metal such as stainless steel disposed inside the seal portion 1016 are provided. These outer ring portion 1014, seal portion 1016 and inner ring portion 1018 are joined and integrated. The gasket 1012 is not limited to a metal one.

In the second embodiment, the gasket 1012 is illustrated in which the outer ring portion 1014 and the inner ring portion 1018 are added to the seal portion 1016. However, the gasket 1012 is obtained by adding only the outer ring portion 1014 to the seal portion 1016. Also good. Moreover, although the spiral wound gasket was illustrated as the gasket 1012, other types of gaskets may be used.

Next, the gasket positioning member 1010 will be described. By attaching the gasket positioning member 1010 to the gasket 1012 to constitute the gasket assembly 1100, the gasket 1012 can be easily attached at an accurate position.

The gasket positioning member 1010 is composed of a substantially rectangular plate-shaped piece 1020 formed of a metal such as stainless steel. When the gasket 1012 is other than metal, for example, a resin gasket positioning member 1010 may be used. A concave portion 1022 for attaching the gasket positioning member 1010 to the outer edge portion of the gasket 1012 is formed at one end of the plate-like piece 1020 in the short direction. The recess 1022 can receive the outer edge of the gasket 1012 inside.

The gasket positioning member 1010 is attached to the gasket positioning member 1010 by caulking one end portion of the plate-like piece 1020 in a state where the outer edge portion of the gasket 1012 is inserted into the recess 1022. Alternatively, the gasket positioning member 1010 may be fixed to the gasket 1012 by spot welding or an adhesive. The gasket positioning member 1010 is attached to the gasket 1012 so that the longitudinal direction thereof coincides with the radial direction of the gasket 1012.

In the gasket assembly 1100 according to the second embodiment, the four gasket positioning members 1010 are attached in the circumferential direction of the gasket 1012 at equal intervals (that is, at intervals of 90 degrees). The distal end of the gasket positioning member 1010, that is, the other end 1024 that faces the one end where the recess 1022 is formed may be formed in an arc shape centered on the center C1 of the gasket 1012. When the gasket positioning member 1010 is attached to the outer edge of the gasket 1012, the length D1 from the center C1 of the gasket 1012 to the other end 1024 of the plate-like piece 1020 is outside the center of the flange to which the gasket 1012 is attached. It is formed and attached so as to correspond to the length to the periphery.

FIG. 12 shows a flange joint structure 1400 according to the second embodiment of the present invention. In FIG. 12, the flange 1030 is illustrated by a solid line, and the gasket assembly 1100 is illustrated by a broken line. FIG. 13 is a cross-sectional view taken along the line BB of the flange joint structure 1400 shown in FIG. In this flange joint structure 1400, a gasket assembly 1100 is interposed between two flanges 1030 facing each other.

The flange 1030 shown in FIG. 12 is a flange on which a flat seat 1032 protruding from the flange surface is formed. In the flange 1030, eight bolt holes 1034 are formed in the circumferential direction at equal intervals (that is, at intervals of 45 degrees). Bolts 1035 are inserted into the respective bolt holes 1034, and two flanges 1030 are fastened by the bolts 1035 and nuts (not shown).

When assembling the flange joint structure 1400, first, four gasket positioning members 1010 are attached to the outer edge of the gasket 1012 to form the gasket assembly 1100. The gasket assembly 1100 is then positioned between the two flanges 1030. In this positioning, the gasket positioning member 1010 is positioned between the adjacent bolt holes 1034, and the other end portion 1024 of each gasket positioning member 1010 (that is, the tip end portion of the gasket positioning member 1010) is connected to the outer peripheral edge of the flange 1030. Match with 1030a. That is, the other end 1024 of the gasket positioning member 1010 and the outer peripheral edge 1030a of the flange 1030 are aligned on the same plane. Thereby, the gasket 1012 can be positioned with respect to the flange 1030 at a predetermined position, that is, a position where the center C1 of the gasket 1012 and the center C2 of the flange 1030 coincide. It is not necessary to visually adjust the position of the gasket from the narrow gap between the flanges as in the prior art, and it is only necessary to align the other end 1024 of each gasket positioning member 1010 with the outer peripheral edge 1030a of the flange 1030. Work can be done very easily.

When the other end portion 1024 of the gasket positioning member 1010 is formed in an arc shape with the center C1 of the gasket 1012 as the center, the other end portion 1024 of the gasket positioning member 1010 and the outer peripheral edge 1030a of the flange 1030 are on the same plane. Since it becomes easy to match, positioning can be performed more easily.

The gasket assembly 1100 according to the second embodiment can be configured by attaching a gasket positioning member 1010 to an ordinary commercially available annular gasket 1012. Accordingly, it is not necessary to manufacture a specially shaped gasket having a plurality of positioning pieces as disclosed in the above-mentioned Patent Document 1, so that it is very inexpensive. As described above, the gasket assembly 1100 according to the second embodiment is also excellent in economy.

14 (a) to 14 (c) are diagrams for explaining the flange rotation. FIG. 14A shows a flange joint structure in which the bolt is normally tightened. However, in a normal flange joint structure, if the flange is wrinkled or the bolts are tightened too much due to one-side tightening of the flanges (a state where a plurality of bolts are not tightened by a uniform force), FIG. As shown in b) and FIG. 14 (c), a flange rotation in which the flange rotates about the outer edge of the flat seat is generated, and the gasket is changed from a surface contact to a line contact on the outer edge side, and there is a risk of leakage from the corresponding portion. There is. Flange rotation can also occur when an external force perpendicular to the axial direction of the flange acts due to an earthquake or the like.

However, in the second embodiment, since the four gasket positioning members 1010 are positioned between the bolts 1035, the flanges are tightened or the bolts are overtightened, or an external force perpendicular to the flange axial direction is applied. Even in this case, the gasket positioning member 1010 resists and the rotation of the flange 1030 is prevented, so that leakage can be prevented in advance.

15 (a) and 15 (b) are cross-sectional views for explaining a modified example of the gasket assembly. In the gasket assembly 1500 shown in FIG. 15A, the gasket positioning member 1010 is divided into two (first divided member 1010a and second divided member 1010b) at the center in the thickness direction. A first divided recess 1022a is formed at one end of the first divided member 1010a, and a second divided recess 1022b is formed at one end of the second divided member 1010b. By joining the first divided member 1010a and the second divided member 1010b with the outer edge portion of the gasket 1012 sandwiched between the first divided concave portion 1022a and the second divided concave portion 1022b, the gasket positioning member 1010 is bonded to the gasket 1012. It is attached. The first divided member 1010a and the second divided member 1010b are joined using spot welding or an adhesive.

In the gasket assembly 1550 shown in FIG. 15B, the gasket positioning member 1010 is divided into three (first divided member 1010a, second divided member 1010b, and third divided member 1010c) in the thickness direction. The first divided member 1010a and the second divided member 1010b are formed slightly longer than the third divided member 1010c. The first divided member 1010a, the second divided member 1010b, and the third divided member 1010c are placed with the outer edges of the third divided member 1010c and the gasket 1012 sandwiched between the first divided concave portion 1022a and the second divided concave portion 1022b. The gasket positioning member 1010 is attached to the gasket 1012 by bonding. The first divided member 1010a, the second divided member 1010b, and the third divided member 1010c are joined using spot welding or an adhesive.

In the gasket assembly shown in FIGS. 15 (a) and 15 (b), the positioning operation of the gasket 1012 with respect to the flange can be easily performed. Further, since it is only necessary to attach a split member having a simple structure to an ordinary commercially available annular gasket 1012, it is very inexpensive.

FIG. 16 is a cross-sectional view for explaining a flange joint structure 1600 according to another embodiment of the present invention. In the flange joint structure 1600 shown in FIG. 16, the illustration of the flange is omitted.

As shown in Fig. 16, the flange joint structure 1600 includes a first gasket assembly 1100A and a second gasket assembly 1100B. The first gasket assembly 1100A and the second gasket assembly 1100B have the same configuration as the gasket assembly 1100 shown in FIGS. The first gasket assembly 1100A and the second gasket assembly 1100B are disposed so as to be concentric.

The flange joint structure 1600 further includes an annular orifice 1060 disposed between the first gasket assembly 1100A and the second gasket assembly 1100B. The length from the center of the orifice 1060 to the outer peripheral edge corresponds to the length from the center C1 of the gasket to the inner end 1023 of the gasket positioning member 1010. The first gasket 1012A and the second gasket 1012B are pressed by the two flanges, so that the orifice 1060 is held between the first gasket 1012A and the second gasket 1012B.

Thus, according to the flange joint structure 1600 according to the present embodiment, the two gasket assemblies and the orifice 1060 can be centered by using the two gasket assemblies. By using the gasket positioning member 1010 of the two gasket assemblies, the hole 1060a of the orifice 1060 and the center of the flange can be aligned. When installing an orifice between two gaskets, it is difficult for two workers to install two gaskets on the flange by aligning the centers of the orifices. However, according to the flange joint structure 1600 according to the present embodiment, two workers can easily install the two gaskets and the orifice at the center of the orifice on the flange.

In the flange joint structure 1600, an annular orifice 1060 is disposed between the first gasket assembly 1100A and the second gasket assembly 1100B. Instead of the orifice 1060, a closing plate (a disc having no holes) is provided. May be arranged.

For example, in the above-described embodiment, the number of gasket positioning members 1010 attached to one gasket 1012 is four, but the number of gasket positioning members 1010 is not particularly limited as long as it is plural. The number of gasket positioning members 1010 is adjusted to 4 + 2N (N is an arbitrary integer and increases or decreases according to the number of bolts of the flange) according to the size and rating of the flange.

The present invention can be used for a gasket holder for holding a gasket and a flange joint structure using the gasket holder. The present invention is also applicable to a gasket positioning member for positioning a gasket, a gasket assembly in which the gasket positioning member and the gasket are assembled, a flange joint structure using the gasket assembly, and a method for manufacturing the gasket assembly. it can.

Claims

A gasket holder for holding an annular gasket disposed between two opposing flanges in a predetermined position with respect to the flange,
An annular portion having an inner diameter capable of accommodating the gasket;
A plurality of projecting portions that project radially outward from the annular portion, and are arranged at intervals in the circumferential direction of the annular portion;
With
The gasket holder according to claim 1, wherein a length from the center of the annular portion to a tip end portion of each protruding portion corresponds to the center to the outer peripheral edge of the flange.
The gasket holder according to claim 1, wherein an inner diameter of the annular portion corresponds to an outer diameter of the gasket.
The gasket holder according to claim 1 or 2, wherein the tip end portion of the projecting portion is formed in an arc shape centering on the center of the annular portion.
The support part which supports the said gasket is formed in the inner periphery of the said annular part so that the center of the thickness direction of the said gasket and the center of the thickness direction of the said annular part may correspond. Item 4. The gasket holder according to any one of Items 1 to 3.
Two opposing flanges;
An annular gasket disposed between the flanges;
A gasket holder for holding the gasket in a predetermined position relative to the flange;
A flange joint structure comprising:
The gasket holder is
An annular portion having an inner diameter capable of accommodating the gasket;
A plurality of projecting portions that project radially outward from the annular portion, and are arranged at intervals in the circumferential direction of the annular portion;
With
The flange joint structure characterized in that the length from the center of the annular portion to the tip of each protruding portion corresponds to the center to the outer periphery of the flange.
The gasket holder holds the first and second gaskets;
6. The flange joint structure according to claim 5, wherein an orifice or a closing plate is disposed between the first and second gaskets.
A gasket positioning member for positioning an annular gasket disposed between two opposing flanges at a predetermined position with respect to the flange,
The gasket positioning member is composed of a plate-shaped piece,
A recess for attaching the gasket positioning member to the outer edge of the gasket is formed at one end of the plate-shaped piece,
When the gasket positioning member is attached to the outer edge of the gasket, the length from the center of the gasket to the other end of the plate-like piece corresponds to the length from the center of the flange to the outer peripheral edge. A gasket positioning member characterized by the above.
The gasket positioning member according to claim 7, wherein the other end portion of the plate-like piece is formed in an arc shape centered on the center of the gasket.
An annular gasket disposed between two opposing flanges;
A gasket positioning member for positioning the gasket at a predetermined position with respect to the flange;
A gasket assembly comprising:
The gasket positioning member comprises a plate-shaped piece,
A recess for attaching the gasket positioning member to the outer edge of the gasket is formed at one end of the plate-shaped piece,
In a state where the gasket positioning member is attached to the outer edge portion of the gasket, the length from the center of the gasket to the other end of the plate-like piece corresponds to the length from the center of the flange to the outer peripheral edge. A gasket assembly characterized by the following.
The gasket assembly according to claim 9, wherein the plurality of gasket positioning members are attached at intervals in the circumferential direction of the gasket.
The gasket assembly according to claim 9 or 10, wherein the other end portion of the plate-like piece is formed in an arc shape centered on the center of the gasket.
Two opposing flanges;
A gasket assembly comprising: an annular gasket disposed between the flanges; and a gasket positioning member for positioning the gasket at a predetermined position relative to the flange;
A flange joint structure comprising:
The gasket positioning member comprises a plate-shaped piece,
A recess for attaching the gasket positioning member to the outer edge of the gasket is formed at one end of the plate-shaped piece,
In a state where the gasket positioning member is attached to the outer edge portion of the gasket, the length from the center of the gasket to the other end of the plate-like piece corresponds to the length from the center of the flange to the outer peripheral edge. Features a flange joint structure.
Comprising first and second gasket assemblies arranged in a stack,
The flange joint structure according to claim 12, wherein an orifice or a closing plate is disposed between the first and second gasket assemblies.
A method for manufacturing a gasket assembly, comprising: an annular gasket disposed between two opposing flanges; and a gasket positioning member for positioning the gasket at a predetermined position with respect to the flange,
A step of preparing a gasket positioning member made of a plate-shaped piece, wherein the gasket-positioning member has a recess formed at one end of the plate-shaped piece to be attached to an outer edge of the gasket;
Attaching the gasket positioning member to an outer edge of the gasket;
With
In a state where the gasket positioning member is attached to the outer edge portion of the gasket, the length from the center of the gasket to the other end of the plate-like piece corresponds to the length from the center of the flange to the outer peripheral edge. A method for manufacturing a gasket assembly characterized by the above.