JP2597071Y2 - gasket - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket, and more particularly, to a gasket effective for sealing a pipe joint such as a pipe flange of a pipe.

[0002]

2. Description of the Related Art Conventionally, an O-ring or the like is used for sealing a pipe joint of a pipe for piping. However, in a pipe flange of a pipe joint, the dimensional accuracy of each flange varies. For this reason, the dimensions of the respective parts after assembly also vary, and therefore the gap dimensions formed between the flanges also vary. If the gap dimensions are too large, one O-ring will not fit into the gap when pressure is applied. There is a risk that the part will protrude. Therefore, in general, a gasket provided with a backup ring, which is a resin or steel reinforcing member, is used to prevent the gasket from protruding into the gap when a pressure is applied.

As a gasket provided with such a backup ring, for example, there is a gasket shown in FIGS. 6 and 7, and a gasket 11 shown in FIG. A backup ring 15 which is a reinforcing member having a L-shaped cross section and made of steel, resin, or the like is embedded on the outer peripheral side of the Y-shaped annular seal member 12. Sharp edge-shaped lip portions 13 and 14 are integrally formed on both surfaces in the axial direction on the circumferential side.

A gasket 21 shown in FIG. 7 has an H-shaped cross-section formed of an elastic body such as rubber, and has an L-shaped cross-section formed of steel, resin, etc. on the outer peripheral side of an annular sealing member 22. A lip portion 23, 24 having a semicircular cross section is integrally formed on both surfaces in the axial direction on the inner peripheral side of the seal member 22. Have been.

In order to seal a pipe flange which is a pipe joint of a pipe using the gaskets 11 and 21 constructed as described above, one of the flanges of the pipe flange has a sealing member 12 for the gaskets 11 and 21. , 22 are brought into contact with each other, and the other lip portions 14, 24 of the sealing members 12, 22 are brought into contact with the other flange, and the two flanges are tightened with bolts or the like. Gaskets 11 and 21
Seal between both flanges.

In this case, the backup rings 15 and 25 buried on the outer peripheral side of the seal members 12 and 22 are located at the mating surface between the two flanges and close the gap formed therein, so that the seal is closed when pressure is applied. A portion of the members 12, 22 is prevented from protruding into the gap.

However, as described above, the flanges of the pipe flanges have variations in dimensional accuracy, so that the gaps formed between the flanges after assembling also vary, and the gaps are too large. In this case, the amount of deformation of the lip portions 13, 14, 23, 24 formed on both surfaces of the seal members 12, 22 in the axial direction is reduced.
The backup rings 15, 25 buried on the outer peripheral side of the seal members 12, 22 are displaced from the mating surface between the two flanges, so that the gap formed there cannot be completely closed, and when pressure is applied, Part of the seal members 12, 22 protrude into the gaps, not only impairing the sealing performance but also significantly reducing the durability of the seal members 12, 22.

The present invention solves the above-mentioned problems of the prior art, and is used for sealing between two members, for example, between flanges of a pipe flange which is a pipe joint.
Even if the dimensional accuracy of each flange is uneven and the gap formed between both flanges after assembly is too large, the reinforcing member on the outer peripheral side of the seal member must be positioned in the gap. It is an object of the present invention to provide a gasket that can completely prevent a part of the seal member from protruding into the gap due to pressure action.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method in which one member and the other member are provided.
A gasket that is mounted to seal between both members,
The other member is provided on a surface facing the one member.
Is installed in the annular groove, and at one end in the axial direction.
An annular lip that contacts the one member, and the other end
An annular thicker than the lip portion abutting the bottom surface of the groove
Annular seal member having a lip portion, and the seal member
And embedded at one end in the axial direction.
It has a surface in contact with one member, and the groove
Means having an annular reinforcing member having a surface in contact with the inner peripheral surface . Also, one member and the other
A gasket that is attached between
Wherein the other member is opposed to the one member.
It is mounted in an annular groove provided on the
An annular lip that abuts the one member at one end in the direction
And the other end of the lip portion is in contact with the bottom surface of the groove.
An annular seal with an annular lip with a large inner diameter
A member, and embedded in the outer peripheral portion of the seal member,
At one end in the axial direction, there is a surface in contact with the one member,
An annular shape having a surface on the outside in the radial direction that comes into contact with the inner peripheral surface of the groove
Means having the above reinforcing member . Further, both members are mounted between one member and the other member.
A gasket for sealing a space between the other members.
It is mounted in an annular groove provided on the surface facing the one member.
While being attached to the one member at one end in the axial direction.
It has an annular lip that abuts on the bottom of the groove at the other end
An annular ring with a larger inner diameter than the lip that abuts
An annular sealing member having a lip portion;
It is embedded in the outer peripheral part, and the one end
And has a surface in contact with one of the members, and the inside of the groove is radially outward.
A means having an annular reinforcing member having a surface abutting on the peripheral surface is adopted.

[0010]

[Action] By this invention is employing the means as described above, the action of pressure, regardless inoperative, the amount of deformation of the lip towards which thin or inner diameter and the thickness was reduced formation of the sealing member is the other Larger than the deformation of the lip ,
Moreover, the outer peripheral portion of the seal member comes into contact with one of the members.
A reinforcing member having a surface and a surface in contact with the inner peripheral surface of the groove is embedded.
Therefore, a reinforcing part is provided on the mating surface between one member and the other member.
Securely positions the timber, so that it is possible to completely close the gap formed therein. Therefore, a part of the seal member does not protrude into the gap between the one member and the other member when a pressure is applied.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below. 1 to 4 show an embodiment of the gasket according to the present invention. FIG. 1 is a sectional view of the gasket, and FIG. 2 is a sectional view showing one member to which the gasket is mounted and the other member. 3 and 4 are cross-sectional views showing a state in which the gasket is mounted between one member and the other member.

That is, the gasket 1 is formed of an elastic body such as rubber, and has a Y-shaped cross section and an annular sealing member 2, and an L-shaped cross section embedded on the outer peripheral side of the sealing member 2. And a backup ring 5 which is a reinforcing member formed of steel, resin or the like in an annular shape.

On both sides of the sealing member 2 in the axial direction,
The lip portions 3 and 4 each having a sharp edge and projecting in the axial direction are integrally formed. In this case, each of the lip portions 3 and 4 is formed so as to become thicker toward the root portion and each lip portion is formed. The thickness of the tip part of parts 3 and 4 is
The thickness a of the upper lip portion 3 (the lip portion that contacts one member described later) in the figure is smaller than the thickness b of the lower lip portion 4 (the lip portion that contacts the other member described later) in the diagram. The inner diameter r of the upper lip 3 in the figure is smaller than the inner diameter s of the lower lip 4 in the figure.

The backup ring 5 is embedded in a corner of the outer peripheral surface of the seal member 2 corresponding to the lip 3 which comes into contact with the one member.

The one member 6 and the other member 7 on which the gasket 1 including the seal member 2 and the backup ring 5 are mounted as described above are configured as shown in FIG. Similar to the conventional example, one member 6 will be described as one flange of a pipe flange which is a pipe joint, and the other member 7 will be described in detail below as the other flange of the pipe flange.

First, as shown in FIG. 3, the gasket 1 is mounted between one flange 6 and the other flange 7 of the pipe flange, and the one lip 3 of the seal member 2 of the gasket 1 is connected to the one lip portion. And the other lip portion 4 of the seal member 2 is brought into contact with the other flange 7, and both flanges 6 and 7 are tightened with a predetermined torque with bolts or the like.

In this case, as described in the conventional example,
Since the dimensional accuracy of the pipe flanges varies, when the flanges 6 and 7 are tightened with bolts or the like, the gap dimension formed between the flanges 6 and 7 varies, and is shown in FIG. This is an example in which the gap between the flanges 6 and 7 is formed small.

Then, by tightening the two flanges 6 and 7 as described above, the sealing member 2 of the gasket 1 is formed.
The two lip portions 3 and 4 are elastically deformed so as to be crushed inward in the radial direction, and the two lip portions 3 and 4 come into close contact with the one flange 6 and the other flange 7, and the outer periphery of the one lip portion 3 The backup ring 5 buried in the side corner is
The outer surface in the axial direction is brought into contact with one flange 6,
The radially outer surface has one flange 6 and the other flange 7
And the gap 8 formed there is closed from the inside.

As a result, the gap 8 formed between the flanges 6 and 7 is completely closed by the backup ring 5, so that even when pressure is applied, a part of the seal member 2 It does not protrude and can prevent breakage of the seal member 2 and the like.

On the other hand, when the gap 8 formed between the flanges 6 and 7 of the pipe flange is large, as shown in FIG. 4, one lip 3 of the seal member 2 of the gasket 1 is connected to one of the pipe flanges. And the other lip portion 4 is in close contact with the other flange 7 with its tip portion being slightly crushed. In this case as well, the corner portion on the outer peripheral side of the one lip portion 3 is provided. Of the backup ring 5 embedded in the
, The outer surface in the radial direction is located at the mating surface of the one flange 6 and the other flange 7, and the gap 8 formed there is closed from the inside.

That is, both lip portions 3 of the sealing member 2,
4, the thickness a of the tip portion of one lip portion 3 is formed smaller than the thickness s of the tip portion of the other lip portion 4, and the inner diameter r of one lip portion 3 is set to the other lip portion. so as to be smaller than 4 of the inner diameter s, so to form two lips 3 and 4, always one of the deformation of the lip portion 3 can be made larger than the deformation amount of the other lip portion 4. Therefore, the entire surface of the one lip portion 3 on the outside in the axial direction can be brought into contact with the one flange 6.

Also, even when pressure is applied, the inner diameter r of one lip portion 3 is formed smaller than the inner diameter s of the other lip portion 4, so that one lip portion 3 is smaller than the other lip portion 4. Thus, the pressure receiving area becomes larger than that of the first lip portion 3, so that the entire outer surface in the axial direction of the one lip portion 3 can be brought into contact with the one flange 6.

Therefore, even when pressure is not applied or when pressure is applied, one lip portion 3 can always be brought into close contact with one flange 6 completely.
The outer surface in the axial direction of the backup ring 5 embedded in the corner on the outer peripheral surface side of the one lip portion 3 can be brought into contact with the one flange 6, and the outer surface in the radial direction can be brought into contact with the one flange 6. It is possible to completely close the gap 8 formed therefrom from the inside by being positioned on the mating surface with the other flange 7.

As a result, a part of the seal member 2 does not protrude into the gap 8 formed between the one flange 6 and the other flange 7 at the time of the pressure action, so that a stable sealing property can always be obtained. And the sealing member 2 has a gap 8
Since breakage of the seal member 2 due to protruding inside can be prevented, durability can be improved.

In the above description, the inner diameter r of one lip 3 of the seal member 2 is made smaller than the inner diameter s of the other lip 4 and the thickness of the tip of the one lip 3 is Although “a” is smaller than the thickness “ b” of the tip portion of the other lip portion 4, any one of the conditions may be set.

That is, the inner diameter r of one lip 3 of the sealing member 2 is smaller than the inner diameter s of the other lip 4, and the thickness a of the tip of the one lip 3 of the sealing member 2 is set to the other. The thickness may be smaller than the thickness b of the tip portion of the lip portion 4.

FIG. 5 shows another embodiment of the gasket according to the present invention. In the gasket 9 shown in this embodiment, a backup ring 10 which is a reinforcing member having a rectangular cross section and an annular shape is used as a sealing member. 2 is buried on the outer peripheral surface side, and the other configuration is the same as that shown in the above embodiment. Therefore, the same parts as those in the above embodiment are denoted by the same reference numerals and detailed description of the configuration is given. Shall be omitted.

The gasket 9 shown in this embodiment exhibits the same operation and effects as those shown in the above embodiment.

[0029]

According to the present invention, as described above, even if the size of the gap formed between the two members due to the assembly of one member and the other member varies,
The deformation amount of one of the lip portion of the seal member can be made larger than the deformation amount of the other lip, moreover, the outer peripheral portion
A reinforcing member is buried in the
And the outer surface in the radial direction against the inner peripheral surface of the groove
By the the way, when brought into contact with one of the lip on one of the members, it can be positioned reliably reinforcing member to the mating surface of the one member and the other member is formed therein Gap can be completely closed from the inside. Therefore, the effect of the pressure, regardless inoperative, can be completely closes the gap formed between the two members. Further, at the time of the action of pressure, thin thickness also
Is the lip with the smaller inner diameter on the other lip
The greater the pressure, the greater the deformation
The gap is completely closed by the reinforcing member. Therefore, excellent sealing properties can always be exhibited, and part of the sealing member does not protrude into the gap between the two members, so that the durability can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a gasket according to the present invention.

FIG. 2 is a sectional view showing one member and the other member to which the gasket shown in FIG. 1 is mounted.

FIG. 3 is a cross-sectional view showing a state where the gasket shown in FIG. 1 is mounted between one member and the other member.

FIG. 4 is a cross-sectional view showing a state in which the gasket shown in FIG. 1 is mounted between one member and the other member.

FIG. 5 is a sectional view showing another embodiment of the gasket according to the present invention.

FIG. 6 is a sectional view showing an example of a conventional gasket.

FIG. 7 is a sectional view showing another example of a conventional gasket.

[Explanation of symbols]

1, 9, 11, 21 ... gasket 2, 12, 22 ... seal member 3, 4, 13, 14, 23, 24 ... lip portion 5, 10, 15, 25 ... reinforcing member (backup ring) 6 ... one member (one flange) 7 ... the other member (other flange) 8 ... gap

Claims (3)

(57) [Scope of request for utility model registration] 1. A device mounted between one member and another member.
A gasket for sealing between the two members.
An annular member provided on a surface of one member facing the one member
At the one end in the axial direction.
Has an annular lip portion abutting on one of the members, and
An annular lip thicker than the lip that abuts the bottom of the groove
Annular seal member having a sealing portion, and an outer periphery of the seal member
Part, and the one end in the axial direction
A surface abutting the member, and an inner peripheral surface of the groove on a radially outer side
A gasket , comprising: an annular reinforcing member having a surface that comes into contact with the gasket. 2. A device mounted between one member and another member.
A gasket for sealing between the two members.
An annular member provided on a surface of one member facing the one member
At the one end in the axial direction.
Has an annular lip portion abutting on one of the members, and
A ring having an inner diameter larger than the lip portion abutting the bottom surface of the groove
Annular sealing member having an annular lip portion, and the sealing portion
Buried in the outer periphery of the material and at one end in the axial direction
A surface contacting one of the members, and
An annular reinforcing member having a surface in contact with the inner peripheral surface of the
A gasket, characterized in that: 3. A device mounted between one member and another member.
A gasket for sealing between the two members.
An annular member provided on a surface of one member facing the one member
At the one end in the axial direction.
Has an annular lip portion abutting on one of the members, and
Thicker and larger inner diameter than the lip that abuts the bottom of the groove
An annular sealing member having an annular lip;
Embedded in the outer periphery of the
The end has a surface that contacts the one member, and
An annular reinforcing member having a surface in contact with the inner peripheral surface of the groove;
A gasket comprising: