JP2020143747A - Gasket and fluid device - Google Patents

Abstract

To enable a deformation form at the time when a gasket is held between flanges to be set to a desired form.SOLUTION: A gasket 9 comprises: an inner ring 10 having an inner ring outer peripheral surface 14 and an inner ring inner peripheral surface 13 surrounding a through hole 10H, and exhibiting an annular shape; and a gasket body part 20 arranged on the inner ring outer peripheral surface 14, having a thickness along a central axis LA larger than that of an inner ring 10, and having elasticity lower than that of the inner ring 10. The inner ring 10 includes a radial neutral axis NA, and a position where the neutral axis NA intersects the central axis LA is shifted in the direction along the central axis LA with respect to a position where the neutral axis NA intersects the gasket body part 20.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to gaskets and fluid systems.

A gasket for maintaining airtightness or watertightness is sandwiched between the joints connecting the pipes. An orifice plate may be installed in such a joint portion to adjust the pressure of the fluid flowing inside the pipe. The installation of orifice plates may be added to the plumbing fixtures after completion. When the orifice plate is installed ex post facto in this way, the peripheral parts of the joint portion may not have a structure in consideration of the installation of the orifice plate. For example, in order to secure an area for installing the orifice plate, it is necessary to take measures such as adjusting the pipe length. Patent Document 1 discloses a gasket having the function of a thin orifice plate that enables subsequent addition without the need for adjusting the pipe length (hereinafter referred to as "gasket with an orifice").

Jikken Sho 63-166794

A thin gasket with an orifice is easily deformed by an external force. Then, depending on the mode of deformation, it may cause an unintended defect.

For example, when a gasket with an orifice is sandwiched between flanges, the gasket with an orifice may be deformed toward the upstream side in the flow direction due to the force due to the sandwiching. On the other hand, the gasket with an orifice continues to receive a force from upstream to downstream from the fluid flowing through the pipe. Then, the gasket with an orifice may instantly switch from the deformation toward the upstream side to the deformation toward the downstream side due to the force received from the fluid. Such switching of the deformation mode causes an unintended problem such as generating an impact sound.

Therefore, in the art, there has been a demand for a technique capable of making a desired form of deformation when a thin gasket that does not require adjustment of the pipe length is sandwiched between flanges, and a fluid device provided with the gasket.

The gasket according to one aspect of the present disclosure is arranged on an inner ring having an outer peripheral surface and an inner peripheral surface surrounding a through hole, and an outer peripheral surface of the inner ring, and the thickness along the central axis of the inner ring is larger than that of the inner ring and lower than that of the inner ring. The inner ring includes a neutral axis set in the radial cross section of the inner ring, and the position where the neutral axis intersects the central axis on the central axis is such that the neutral axis is the gasket main body. It is offset in the direction along the central axis with respect to the intersecting position.

In this configuration, when a compressive force along the central axis acts on the gasket main body, the gasket main body is deformed so as to be crushed, and a compressive force along the radial direction acts on the inner ring. Here, on the central axis, the position where the central axis of the inner ring and the neutral axis intersect is shifted in the direction along the central axis with respect to the position where the neutral axis and the gasket main body intersect. Therefore, the inner ring is deformed in the direction in which the neutral axis is deviated. That is, it is possible to set the deformation direction of the inner ring to a desired direction according to the direction in which the neutral axis of the inner ring is displaced. As a result, the deformation mode when the gasket is sandwiched between the flanges can be set to a desired mode.

The gasket may be further provided with an outer ring which is arranged on the outer peripheral surface of the gasket main body and has a thickness along the central axis that is smaller than that of the gasket main body and has higher elasticity than that of the gasket main body. When the gasket main body is compressed, the gasket main body is also deformed toward the outer ring. However, since this deformation can be suppressed by the outer ring, the force caused by the deformation of the gasket main body portion acts more preferably toward the inner ring. Therefore, the deformation of the inner ring can be more reliably generated.

In the above gasket, the width of the inner peripheral surface along the central axis may be smaller than the width of the outer peripheral surface along the central axis. According to this configuration, the deformation of the inner ring can be more reliably generated.

In the above gasket, the thickness of the inner ring along the central axis is constant between the outer peripheral surface and the inner peripheral surface, and the position of the inner peripheral surface along the central axis is relative to the position of the outer peripheral surface along the central axis. It may be deviated in the direction along the central axis. This configuration also makes it possible to more reliably cause deformation of the inner ring.

In the above gasket, the inner ring may have a first portion including the outer peripheral surface and extending in the radial direction of the inner ring, and a second portion including the inner peripheral surface and extending in the radial direction of the inner ring. Good. This configuration also makes it possible to more reliably cause deformation of the inner ring.

In the above gasket, the inner ring may extend so as to be inclined with respect to the radial direction of the inner ring. This configuration also makes it possible to more reliably cause deformation of the inner ring.

The fluid device according to another aspect of the present disclosure includes a first pipe, a second pipe connected to one end side of the first pipe, a gasket sandwiched between the first pipe and the second pipe, and a first. 1 A pressure source connected to the other end side of the pipe, and a gasket is arranged on an inner ring having an outer peripheral surface and an inner peripheral surface surrounding a through hole, and an outer peripheral surface of the inner ring, and has a thickness along the central axis of the inner ring. Provided with a gasket body portion that is larger than the inner ring and has lower elasticity than the inner ring, the inner ring includes a neutral axis set in the radial cross section of the inner ring, the neutral axis intersecting the central axis on the central axis. The position is deviated from the position where the neutral axis intersects the gasket main body in the direction from the first pipe to the second pipe along the central axis.

This fluid system includes the above-mentioned gasket, and the deviation direction of the neutral axis in the gasket is the direction from the first pipe to the second pipe. As a result, when the gasket is sandwiched, the inner ring is deformed in the direction from the first pipe to the second pipe. Then, the direction of deformation of the gasket coincides with the direction of the force received from the flow from the first pipe to the second pipe. As a result, the phenomenon that the direction of deformation of the gasket is switched does not occur. Therefore, it is possible to suitably suppress the generation of impact noise generated when the direction of deformation of the gasket is switched.

According to the gasket and the fluid device of the present disclosure, the deformation mode when the gasket is sandwiched between the flanges can be set to a desired mode.

FIG. 1 is a diagram showing a fluid device according to one embodiment. FIG. 2 is an enlarged cross-sectional view showing a joint portion of the fluid device of FIG. FIG. 3 is an enlarged cross-sectional view showing a main part of the gasket. FIG. 4 is an enlarged cross-sectional view showing a main portion of the gasket according to the first modification. FIG. 5 is an enlarged cross-sectional view showing a main portion of the gasket according to the modified example 2.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIG. 1, the fluid device 1 includes a pressure unit 2 (pressure source), a load unit 3, an upstream pipe 4 (first pipe), a downstream pipe 5 (second pipe), and a joint portion 6. Has. The pressure unit 2 is, for example, a fluid machine such as a compressor or a pump. The pressure unit 2 may be any one that discharges a fluid having a predetermined pressure. The upstream end of the upstream pipe 4 is connected to the pressure unit 2. The upstream end of the downstream pipe 5 is connected to the downstream end of the upstream pipe 4 via a joint portion 6. The downstream end of the downstream pipe 5 is connected to the load unit 3. The load unit 3 is a fluid machine such as a turbine or a heat exchanger that performs a desired operation using the fluid provided by the pressure unit 2.

According to such a fluid device 1, a fluid having a predetermined pressure is provided from the pressure unit 2 to the upstream pipe 4. The fluid moves to the load portion 3 via the joint portion 6 and the downstream pipe 5. That is, in the fluid device 1, the fluid flows from the pressure unit 2 toward the load unit 3. Further, in the fluid device 1, a pressure gradient is generated from the pressure unit 2 side toward the load unit 3. Specifically, the pressure portion 2 side is the high pressure side, and the load portion 3 side is the low pressure side.

The joint portion 6 connects the downstream end of the upstream pipe 4 to the upstream end of the downstream pipe 5. The joint portion 6 has an upstream flange 7, a downstream flange 8, and a gasket 9.

As shown in FIG. 2, the gasket 9 is sandwiched between the upstream flange main surface 7a of the upstream flange 7 and the downstream flange main surface 8a of the downstream flange 8. The gasket 9 connects the upstream flange 7 and the downstream flange 8 in a watertight or airtight manner. Further, the gasket 9 sets the pressure on the upstream side and the pressure on the downstream side to a predetermined pressure difference. That is, the gasket 9 also functions as an orifice. Therefore, it can be said that the gasket 9 is a gasket with an orifice.

The gasket 9 has an inner ring 10, a gasket main body 20, and an outer ring 30 as main components.

The inner ring 10 has an annular shape having a through hole 10H. The inner ring 10 is formed of, for example, a metal material. The inner ring 10 functions as an orifice. The inner ring 10 has an inner ring main surface 11, an inner ring back surface 12, an inner ring inner peripheral surface 13, and an inner ring outer peripheral surface 14.

The area surrounded by the inner peripheral surface 13 of the inner ring is a through hole 10H. The diameter of the through hole 10H is smaller than the diameter of the hole 7H of the upstream flange 7. Similarly, the diameter of the through hole 10H is smaller than the diameter of the hole 8H of the downstream flange 8. The inner ring inner peripheral surface 13 includes a tapered portion 13a and a straight hole portion 13b. The tapered portion 13a is provided on the inner ring main surface 11 side. The tapered portion 13a is provided on the upstream side with respect to the flow. In other words, it can be said that the tapered portion 13a is provided on the high pressure side. The straight hole portion 13b is provided on the downstream side with respect to the flow.

The tapered portion 13a includes an outer peripheral side edge portion 13a1 and an inner peripheral side edge portion 13a2. The tapered portion 13a is formed so that its diameter decreases from the outer peripheral side edge portion 13a1 toward the inner peripheral side edge portion 13a2. That is, the diameter of the inner peripheral side edge portion 13a2 is smaller than the diameter of the outer peripheral side edge portion 13a1. Since the inner peripheral side edge portion 13a2 is continuous with the straight hole portion 13b, the diameter of the inner peripheral side edge portion 13a2 is equal to the diameter of the straight hole portion 13b. In other words, the diameter of the outer peripheral side edge portion 13a1 is larger than the diameter of the inner peripheral side edge portion 13a2. On the other hand, the diameter of the outer peripheral side edge portion 13a1 is smaller than the diameter of the hole 7H of the upstream flange 7 and the diameter of the hole 8H of the downstream flange 8.

The diameter of the inner ring outer peripheral surface 14 is larger than the diameter of the hole 7H of the upstream flange 7 and the hole 8H of the downstream flange 8. Therefore, a part of the inner ring main surface 11 faces the upstream flange main surface 7a. On the other hand, the inner ring main surface 11 does not come into contact with the upstream flange main surface 7a. A slight gap is formed between the inner ring main surface 11 and the upstream flange main surface 7a. Similarly, the inner ring back surface 12 faces the downstream flange main surface 8a. On the other hand, the inner ring back surface 12 does not come into contact with the downstream flange main surface 8a. A slight gap is formed between the inner ring back surface 12 and the downstream flange main surface 8a.

The gasket main body 20 is attached so as to surround the inner ring outer peripheral surface 14. The gasket main body 20 functions as a sealing member. The gasket main body 20 is formed by stacking a strip-shaped hard material (hoop) processed into a V-shaped cross section and a strip-shaped soft material (filler) and winding them in a spiral shape. It is called a gasket. The hoop is made of a metal material such as stainless steel. The filler is formed of, for example, an inorganic material such as expanded graphite. The rigidity (elasticity) of the gasket main body 20 is smaller than that of the inner ring 10. The gasket main body 20 has a gasket main body main surface 21, a gasket main body back surface 22, a gasket main body inner peripheral surface 23, and a gasket main body outer peripheral surface 24. The inner peripheral surface 23 of the gasket main body is in contact with and fixed to the outer peripheral surface 14 of the inner ring. The gasket main body main surface 21 comes into contact with the upstream flange main surface 7a. The back surface 22 of the gasket main body comes into contact with the main surface 8a of the downstream flange. More specifically, the gasket main body main surface 21 and the gasket main body back surface 22 are pressed against the upstream flange main surface 7a and the downstream flange main surface 8a, respectively. Since the gasket main body 20 is slightly crushed by this pressing, airtightness or watertightness is ensured between the upstream flange main surface 7a and the downstream flange main surface 8a.

The gasket main body 20 may be composed of only a filler. Further, the gasket main body 20 does not have to have a structure in which a strip-shaped material is wound in a spiral shape (spiral-shaped gasket), and for example, a sheet-shaped material is punched out (sheet gasket). There may be.

The outer ring 30 is attached so as to surround the outer peripheral surface 24 of the gasket main body. The outer ring 30 functions to tighten the gasket main body 20 and maintain the structure of the gasket main body 20. The outer ring 30 may be omitted if necessary. The outer ring 30 has an outer ring main surface 31, an outer ring back surface 32, an outer ring inner peripheral surface 33, and an outer ring outer peripheral surface 34. The thickness of the outer ring 30 along the central axis LA may be smaller than the thickness of the gasket main body 20, and for example, the thickness of the outer ring 30 may be the same as the thickness of the inner ring 10.

The outer ring inner peripheral surface 33 is in contact with the gasket main body outer peripheral surface 24. Specifically, the outer ring inner peripheral surface 33 tightens the gasket main body outer peripheral surface 24 in the radial direction. The diameter of the outer ring inner peripheral surface 33 is larger than the diameter of the hole 7H of the upstream flange 7 and the diameter of the hole 8H of the downstream flange 8. Similarly, the diameter of the outer ring outer peripheral surface 34 is also larger than the diameter of the hole 7H of the upstream flange 7 and the diameter of the hole 8H of the downstream flange 8. The outer ring main surface 31 faces the upstream flange main surface 7a, but does not contact. A gap is formed between the outer ring main surface 31 and the upstream flange main surface 7a. The outer ring back surface 32 faces the downstream flange main surface 8a, but does not contact. A gap is formed between the outer ring back surface 32 and the downstream flange main surface 8a.

Hereinafter, the action and effect of the gasket 9 having the above structure will be described.

As shown in FIG. 3, when the gasket main body 20 is sandwiched between the upstream flange 7 and the downstream flange 8, the gasket main body main surface 21 and the gasket main body back surface 22 receive a compressive force F1 along the central axis LA. When the gasket main body 20 is compressed, the gasket main body 20 is deformed in the radial direction. According to this deformation, the gasket main body outer peripheral surface 24 moves to the outer peripheral side, and the gasket main body inner peripheral surface 23 moves to the inner peripheral side (see the gasket main body inner peripheral surface 23s). Due to the movement of the inner peripheral surface 23 of the gasket main body, the inner ring outer peripheral surface 14 receives a compressive force F2 in the radial direction toward the central axis LA. That is, the inner ring 10 receives a compressive force F2 that shrinks its outer diameter.

Here, in the inner ring 10, the width of the inner ring inner peripheral surface 13 along the central axis LA (specifically, the width W1 of the surface surrounding the straight hole portion 13b) is larger than the width W2 of the inner ring outer peripheral surface 14 along the central axis LA. Is also small. This is because the inner ring inner peripheral surface 13 has a tapered portion 13a formed on the inner ring main surface 11 side. Here, in the inner ring 10, the portion having the width W2 is referred to as the outer peripheral portion 15, and the portion where the width gradually decreases from the width W2 and reaches the width W1 (tapered portion 13a) is referred to as the inner peripheral portion 16. In a cross section of such a shape, a mechanically neutral axis N is defined. The neutral axis N can be said to be a position where no compressive force and tensile force are generated when a bending moment is applied. Then, the neutral axis N in the radial cross section of the inner ring 10 differs in the mode between the neutral axis N1 in the outer peripheral portion 15 having a constant thickness and the neutral axis N2 in the inner peripheral portion 16 in which the thickness gradually decreases. That is, in the outer peripheral portion 15 where the thickness can be regarded as constant, the direction of the neutral axis N1 is orthogonal to the central axis LA. On the other hand, since the thickness of the inner peripheral portion 16 gradually decreases, the direction of the neutral axis N2 connecting the center of the thickness is inclined with respect to the central axis LA. For example, the neutral axis N2 in the inner peripheral portion 16 is inclined to the downstream side. In other words, the position P1 where the neutral axis N2 of the inner peripheral portion 16 intersects the central axis LA is the direction (downstream side) along the central axis LA with respect to the position P2 where the neutral axis N1 intersects the inner peripheral surface 23 of the gasket main body. ) Is off.

When a compressive force F2 along the radial direction acts on the inner ring 10 in which such a neutral axis N is formed, the inner peripheral portion 16 of the inner ring 10 is deformed in the direction in which the neutral axis N2 is tilted (toward the downstream direction). Refer to the tapered portion 13as and the inner ring back surface 12s shown by the broken line). In other words, the inner peripheral portion 16 is deformed to the side opposite to the side where the tapered portion 13a is provided. Therefore, by providing the tapered portion 13a, the aspect of the neutral shaft N changes in the radial direction. As a result, the direction of deformation when the inner ring 10 receives the compressive force F2 can be generated in the intended direction.

Then, in the case of the present embodiment, it is desirable to deform the inner ring 10 in the tightened state to the downstream side. Therefore, in the gasket 9, the inner ring main surface 11 provided with the tapered portion 13a is directed to the upstream side (high pressure side), and the inner ring back surface 12 through which the straight hole portion 13b opens is directed to the downstream side (low pressure side). Then, since the inner ring 10 can always be deformed toward the downstream side, it is possible to prevent an unintended change in the deformation direction and suppress the generation of impact noise.

In short, the gasket 9 of the present disclosure can be intended to be a mode of deformation that occurs when it is installed on the joint portion 6. Specifically, the compressive force F1 generated when sandwiched between the upstream flange 7 and the downstream flange 8 can cause the inner ring 10 to be deformed in the direction opposite to the surface on which the tapered portion 13a is provided. .. As a result, for example, when the gasket 9 is arranged in the joint portion 6, the inner ring 10 can be arranged so as to be deformed toward the downstream side (low pressure side). The direction of deformation of the inner ring 10 toward the downstream side is the same as the direction of deformation due to the force received from the flowing fluid. Therefore, the direction of deformation does not change due to the force received from the fluid. In other words, when the gasket 9 is tightened, the warp of the inner ring 10 can be arranged so as to face the downstream side. As a result, it is possible to suitably suppress the generation of impact noise generated when the direction of deformation is switched. That is, since the inner ring 10 is always deformed to the downstream side, it does not warp due to the influence of the differential pressure or the pulsation. As a result, the pulsation can be reduced without causing abnormal noise, damage to the inner ring 10, and loss of the gasket sealing function.

Further, the fluid device 1 provided with the pressure section 2 such as a compressor or a pump may cause vibration of the piping or the wake device (load section 3) due to the pressure pulsation generated by those machines. In the gasket 9 according to the present disclosure, in order to reduce piping vibration and vibration of wake equipment caused by such pressure pulsation, a thin gasket 9 having a function as an orifice is easily installed in the joint portion 6. Can be done.

The gasket 9 is arranged on the outer peripheral surface 24 of the gasket main body, and further includes an outer ring 30 having a thickness along the central axis LA that is smaller than that of the gasket main body 20 and higher than that of the gasket main body 20. When the gasket main body 20 is compressed, the gasket main body 20 is also deformed toward the outer ring 30. This deformation applies a compressive force F3 to the outer ring 30. Further, since the compressive force F3 can be suppressed by the reaction force F4 caused by the outer ring 30, the compressive force caused by the deformation of the gasket main body 20 acts more preferably toward the inner ring 10. Therefore, the deformation of the inner ring 10 can be more reliably generated.

Although the embodiment of the present invention has been described above, it may be implemented in various forms without being limited to the above embodiment. That is, the gasket 9 of the present disclosure is not limited to the embodiment of the above embodiment. The inner ring 10 may be any as long as it can control the deformation direction of the inner ring 10 in a state where the gasket 9 is sandwiched between the upstream flange 7 and the downstream flange 8. More specifically, in the inner ring 10, the position P1 where the neutral axis N intersects the central axis LA is in the direction (downstream) along the central axis LA with respect to the position P2 where the neutral axis N intersects the outer peripheral surface 24 of the gasket main body. It suffices if it is shifted to the side).

<Modification example 1>
In the gasket 9 of the embodiment, the configuration of the neutral axis N with respect to the central axis LA is set by changing the thickness of the inner ring 10 in the radial direction. For example, as shown in FIG. 4, the gasket 9A may have a neutral axis NA set according to the shape of the inner ring 10A. Specifically, the inner ring 10A has an outer peripheral portion 15A (first portion) and an inner peripheral portion 16A (second portion). The outer peripheral portion 15A has the same configuration as the inner ring 10, and includes the neutral shaft N1A. On the other hand, although the inner peripheral portion 16A has a constant thickness, both the inner peripheral side of the inner ring main surface 11A and the inner peripheral side of the inner ring back surface 12A are inclined with respect to the central axis LA. In other words, the inner peripheral portion 16A is bent to the downstream side with respect to the outer peripheral portion 15A extending so as to be orthogonal to the central axis LA. The term "tilted" as used herein means that the inner ring main surface 11A and the inner ring back surface 12A are not orthogonal to the central axis LA. Even in the gasket 9A provided with the inner ring 10A having such a shape, the position P1A where the neutral shaft N2A of the inner peripheral portion 16A intersects the central axis LA is the position where the neutral shaft N1A intersects the inner peripheral surface 23 of the gasket main body portion. It is deviated from P2A in the direction along the central axis LA (downstream side). Therefore, the gasket 9A according to the first modification can obtain the same effect as the gasket 9 according to the embodiment.

<Modification 2>
In the first modification, only the inner peripheral portion 16A of the inner ring 10A is tilted, and the outer peripheral portion 15A of the inner ring 10A is not tilted. That is, the outer peripheral portion 15A of the inner ring 10A was orthogonal to the central axis LA. As shown in FIG. 5, in the second modification, the gasket 9B has an inner ring 10B having a constant thickness. The inner ring 10B has an inner ring main surface 11B, an inner ring back surface 12B, an inner ring inner peripheral surface 13B, and an inner ring outer peripheral surface 14B. The entire inner ring 10B is inclined with respect to the central axis LA. Even in the inner ring 10B having such a shape, the position P1B where the neutral shaft NB of the inner peripheral portion 16 intersects the central axis LA is relative to the position P2B where the neutral shaft NB intersects the inner peripheral surface 23 of the gasket main body portion. It is deviated in the direction (downstream side) along the central axis LA. Therefore, the gasket 9B according to the modified example 2 can obtain the same effect as the gasket 9 according to the embodiment.

1 Fluid device 2 Pressure section (pressure source)
3 Load section 4 Upstream piping (first piping)
5 Downstream piping (second piping)
6 Contact part 7 Upstream flange 7a Upstream flange main surface 7H Hole 8 Downstream flange 8a Downstream flange main surface 8H Hole 9,9A, 9B Gasket 10,10A, 10B Inner ring 10H Through hole 11,11A Inner ring main surface 12,12A Inner ring back surface 13 Inner ring inner peripheral surface 13a Tapered part 13b Straight hole part 13a1 Outer peripheral side edge part 13a2 Inner peripheral side edge part 14 Inner ring outer peripheral surface 15, 15A Outer peripheral part 16, 16A Inner peripheral part 20 Gasket body part 21 Gasket body part Main surface 22 Gasket body Back surface 23 Gasket body Inner peripheral surface 24 Gasket body outer peripheral surface 30 Outer ring 31 Outer ring Main surface 32 Outer ring back surface 33 Outer ring inner peripheral surface 34 Outer ring outer peripheral surface LA Center axis N, N1, N2, N1A, N2A, NA, NB Neutral axis

Claims (7)

An inner ring having an outer peripheral surface and an inner peripheral surface surrounding the through hole,
A gasket main body that is arranged on the outer peripheral surface of the inner ring and has a thickness along the central axis of the inner ring that is larger than the inner ring and has lower elasticity than the inner ring.
The inner ring includes a neutral axis set in the radial cross section of the inner ring.
A gasket having a position on the central axis where the neutral axis intersects the central axis is offset in a direction along the central axis with respect to a position where the neutral axis intersects the gasket main body. The gasket according to claim 1, further comprising an outer ring which is arranged on the outer peripheral surface of the gasket main body and has a thickness along the central axis that is smaller than that of the gasket main body and has higher elasticity than that of the gasket main body. The gasket according to claim 1 or 2, wherein the width of the inner peripheral surface along the central axis is smaller than the width of the outer peripheral surface along the central axis. The thickness of the inner ring along the central axis is constant between the outer peripheral surface and the inner peripheral surface.
The gasket according to claim 1 or 2, wherein the position of the inner peripheral surface along the central axis is deviated from the position of the outer peripheral surface along the central axis in a direction along the central axis. 4. The inner ring has a first portion including the outer peripheral surface and extending in the radial direction of the inner ring, and a second portion including the inner peripheral surface and extending in a radial direction of the inner ring. The gasket described in. The gasket according to claim 4, wherein the inner ring extends so as to be inclined with respect to the radial direction of the inner ring. The first pipe and
The second pipe connected to one end side of the first pipe and
A gasket sandwiched between the first pipe and the second pipe,
A pressure source connected to the other end side of the first pipe is provided.
The gasket is
An inner ring having an outer peripheral surface and an inner peripheral surface surrounding the through hole,
A gasket main body that is arranged on the outer peripheral surface of the inner ring and has a thickness along the central axis of the inner ring that is larger than the inner ring and has lower elasticity than the inner ring.
The inner ring includes a neutral axis set in the radial cross section of the inner ring.
On the central axis, the position where the neutral axis intersects the central axis is such that the position where the neutral axis intersects the gasket main body is from the first pipe to the second pipe along the central axis. A fluid device that is offset in the direction of.

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