JP2012072863A - Annular seal material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal material capable of preventing the projection of the seal material from a clearance between an attaching surface and an abutting surface, and an inclination, etc. in a groove.SOLUTION: The annular seal material is attached in an annular seal groove formed on the attaching surface of an attaching member and seals a clearance between the attaching member and an abutting member by being pushed on an abutting surface by introducing fluid from a bottom of the seal groove. The annular seal material includes a body 18 provided with at least a swelling part 12 disposed to be located at an opening side of the seal groove and formed by being swollen to an abutting surface side rather than the attaching surface and a first lip 14 and a second lip 16 disposed to be on a bottom side of the seal groove and extended continuously from the swelling part along a radial inside surface and a radial outside surface of the seal groove in the cross section when the annular seal material is attached in the seal groove. In a corner 30 located at a radial inner peripheral side and/or a radial outer peripheral side of the swelling part, a backup ring 92 for preventing a projection which is formed of a material harder than that of the body is disposed.

Description

  The present invention relates to an annular seal member that is mounted in an annular seal groove formed in a mounting member and is used for sealing between the mounting member and an abutting member, and more specifically, a processing pot. The present invention relates to an annular sealing material used for sealing between a housing portion and a lid.

  Conventionally, for example, fumigation has been performed using a treatment kettle. Such a processing hook includes a substantially cylindrical accommodating portion, and one and the other lid provided to seal both ends of the accommodating portion. For example, a sealing groove is formed on the lid side. The annular sealing material is mounted in the seal groove, and the annular sealing material is sealed between the lid and the accommodating portion by making the lid and the accommodating portion face each other and the annular sealing material is brought into contact with the accommodating portion. It comes to stop.

  Incidentally, as shown in FIG. 9, the annular sealing material 100 used for sealing has a substantially U-shaped cross section, and is continuously extended from the bulging portion 102 and the bulging portion 102. A main body portion 108 including a first lip portion 104 and a second lip portion 106, and a recess 114 is formed between the first lip portion 104 and the second lip portion 106, and an annular seal The width of the material 100 is set to be approximately the same as the width of the seal groove to be mounted.

  When the annular sealing material 100 is mounted in, for example, the sealing groove 230 provided in the lid body 220 of the treatment tank 200 as shown in FIG. The lip 106 is mounted so that the lip 106 side is located on the bottom 232 side of the seal groove 230 and the bulging part 102 is located on the opening 240 side, and the bulging part 102 bulges slightly outside the opening 240. Installed.

  When the annular seal member 100 is mounted in the seal groove 230, it is annular between the radially inner surface 236 of the seal groove 230 and the radially inner peripheral side 110 of the annular seal member 100 and between the radially outer surface 238 of the seal groove 230 and the annular groove. The space between the outer peripheral side 112 of the sealing material 100 is sealed.

  Next, in this state, the lid body 220 and the housing portion 210 are opposed to each other, and the fluid 300 is introduced into the seal groove 230 from the fluid introduction hole 234 on the bottom portion 232 side of the seal groove 230 formed in the lid body 220.

  Then, the concave portion 114 of the annular sealing material 100 receives the fluid 300, and the annular sealing material 100 is pressed toward the opposing accommodating portion 210, so that the bulging portion 102 is brought into contact with the accommodating portion 210, and is accommodated with the bulging portion 102. The space between the portions 210 is sealed.

  By sealing these three places, the space between the housing portion 210 and the lid 220 can be completely sealed with the annular sealing material 100.

  By the way, when the space between the housing portion 210 and the lid body 220 is sealed with the annular sealing material 100 in this way, when the pressure of the fluid 300 introduced from the bottom 232 side of the sealing groove 230 is increased, the annular sealing material. As shown in FIG. 11A, 100 is strongly pushed toward the housing portion 210 by the pressure of the fluid 300 introduced from the bottom portion 232 side of the seal groove 230, and in particular, the entire bulging portion 102 is pressed against the housing portion 210. The contact surface 212 is pressed and deformed.

At this time, the corner portions 116 and 118 of the bulging portion 102 may protrude between the mounting surface 222 of the lid 220 and the contact surface 212 of the housing portion 210.
Then, after the gap between the container 210 and the lid 220 is sealed in a state where the protrusion has occurred, a fluid 302 such as carbon dioxide gas is introduced into the container 210 as shown in FIG. When the pressure is generated from the inside to the outside of the housing portion 210, the corner portion 116 on the radially inner peripheral side 110 of the bulging portion 102 will be pressed toward the radially outer peripheral side 112 in the future. The corner portion 118 of 112 further protrudes between the mounting surface 222 of the lid body 220 and the contact surface 212 of the housing portion 210.

  As described above, when only the corner portion 118 of the bulging portion 102 protrudes between the mounting surface 222 of the lid body 220 and the contact surface 212 of the housing portion 210, the posture of the annular sealing material 100 is changed within the seal groove 230. Will be inclined.

  In particular, as in the state shown in FIG. 11B, both the pressure by the fluid 300 introduced from the bottom 232 of the annular sealing material 100 and the pressure by the fluid 302 generated from the inside of the accommodating portion 210 are used. When pressure is applied, the entire annular sealing material 100 is pulled in the direction in which this protrusion occurs (the lower left direction in FIG. 11B), and the diameter of the inner diameter side 110 of the annular sealing material 100 and the diameter of the seal groove 230 are increased. The sealing performance between the inner surface 236 and the inner surface 236 is deteriorated, and the fluid introduced from the inner diameter side 110 of the annular seal member 100 and the inner diameter surface 236 of the seal groove 230 from the bottom 232 side of the seal groove 230. 300 may leak out.

Such leakage of the fluid 300 is a particularly serious problem because it causes a failure to obtain a desired sealing performance.
In addition, since a large load is locally applied to the protruding portion of the annular sealing material 100, it is a factor that shortens the product life, and between the housing portion 210 and the lid 220. Due to rubbing, particles may be generated or broken, and the present situation is that solutions for these problems are required.

  The present invention has been made in view of such a current situation, and the fluid introduced from the bottom side of the seal groove does not leak from the seal groove, and the gap between the mounting member and the contact member is reliably sealed. It aims at providing the annular sealing material which can be stopped.

  Furthermore, the present invention does not cause the corner portion of the bulging portion to protrude from between the mounting member and the abutting member, thereby causing no inclination in the seal groove, suppressing the generation of particles and tearing, An object of the present invention is to provide an annular sealing material capable of reliably sealing between the mounting member and the contact member.

The present invention was invented to solve the problems in the prior art as described above,
The annular sealing material of the present invention is
It is mounted in an annular seal groove formed on the mounting surface of the mounting member, and the fluid is introduced from the bottom of the seal groove after the mounting surface of the mounting member and the contact surface of the contact member are opposed to each other. An annular sealing material that is pressed against the contact surface and thereby seals between the mounting member and the contact member,
When the annular sealing material is mounted in the seal groove, in its cross section,
A bulging portion disposed so as to be positioned on the opening side of the seal groove, and bulging to a contact surface side from the mounting surface;
A first lip portion and a second lip disposed so as to be located on the bottom side of the seal groove and continuously extending from the bulge portion along the radially inner side surface and the radially outer side surface of the seal groove, respectively. And
A main body having at least
Furthermore, the main body is
A protrusion ring for preventing protrusion is made of a material harder than the main body at the corners located on the inner diameter side and / or the outer diameter side of the bulging part.

  If the backup ring for preventing protrusion is disposed in this way, the backup ring for preventing protrusion is harder than the main body, and therefore the corner portion of the bulging portion is less likely to be deformed, and the mounting member and the contact member It can be prevented from protruding from between. This also prevents the annular seal material from being inclined in the seal groove.

  Therefore, it is possible to prevent the product life of the annular sealing material from being shortened, further prevent generation of particles and tearing, and fluid introduced from the bottom side of the seal groove leaks from between the mounting member and the contact member. Can also be prevented.

The annular sealing material of the present invention is
A protrusion preventing chamfered portion is formed at a corner portion opposite to the corner portion where the protrusion preventing backup ring is disposed.

  In this way, when the protrusion prevention backup ring is provided on one side of the corner portion and the protrusion prevention chamfered portion is formed on the other side, it is further expanded than the case where only the protrusion prevention backup ring is provided. It is possible to prevent the corner portion of the protruding portion from being easily deformed and to protrude from between the mounting member and the abutting member, thereby further preventing the annular sealing material from being inclined in the seal groove.

The annular sealing material of the present invention is
The first lip portion and the second lip portion are
When the side continuous with the bulging portion is the front end and the opposite side is the rear end,
It is configured to expand outwardly from the width of the bulging portion as it goes from the front end to the rear end.

  If the first lip portion and the second lip portion are configured in this way, when the annular sealing material is mounted in the seal groove, both the lip portions are always stretched against the radially inner surface and the radially outer surface of the seal groove. Therefore, the fluid introduced into the seal groove from the bottom side of the seal groove is the inner diameter side of the seal groove, the inner diameter side of the annular seal material, and the outer diameter surface of the seal groove and the diameter of the annular seal material. It is possible to reliably prevent leakage from between the outer peripheral sides.

The annular sealing material of the present invention is
The first lip portion and the second lip portion are
It is characterized by having the same thickness from the front end to the rear end.

  If the first lip portion and the second lip portion are substantially the same thickness in this way, when the fluid is introduced into the seal groove from the bottom side of the seal groove, both lip portions are directed toward the inside of the seal groove. There is no turning over.

  Therefore, the fluid introduced into the seal groove from the bottom side of the seal groove is between the radially inner surface of the seal groove and the radially inner side of the annular seal material, and between the radially outer surface of the seal groove and the radially outer side of the annular seal material. It is possible to reliably prevent leakage from the air.

  According to the annular sealing material of the present invention, since the protrusion ring for preventing the protrusion made of a material harder than the main body portion is provided at the corner portion of the bulging portion, the corner portion of the bulging portion contacts the mounting member. It does not protrude from between the contact members, and the space between the mounting member and the contact member can be reliably sealed.

  Furthermore, according to the annular sealing material of the present invention, since the chamfered portion for preventing protrusion is further formed at the corner opposite to the corner where the backup ring for preventing protruding is disposed, the corner of the bulging portion is formed. The corner portion does not protrude from between the mounting member and the contact member, and the space between the mounting member and the contact member can be reliably sealed.

  Further, according to the annular sealing material of the present invention, in addition to the above-described configuration, the first lip portion and the second lip portion are configured to expand outward beyond the width of the bulging portion. The fluid introduced from the bottom side of the seal groove does not leak from the seal groove, and the gap between the mounting member and the contact member can be reliably sealed.

FIG. 1 is a cross-sectional view of an annular sealing material in the first embodiment of the present invention. FIG. 2 is a cross-sectional view for explaining a state in which the annular sealing material in the first embodiment of the present invention is mounted in the seal groove. FIG. 3 is a schematic view of a backup ring for preventing protrusion, which is a divided body. FIG. 4 is an explanatory view of the annular sealing material in the first embodiment of the present invention in which the bulging portion is deformed by the fluid, and FIG. 4 (a) shows the annular sealing material in a state where the fluid is introduced from the sealing groove. FIG. 4B is an explanatory diagram of the annular sealing material in a state where the fluid is introduced from the seal groove and the fluid is generated from the inside to the outside of the housing portion. FIG. 5 is a cross-sectional view of the annular sealing material in the second embodiment of the present invention. FIG. 6 is a cross-sectional view for explaining a state in which the annular sealing material in the second embodiment of the present invention is mounted in the seal groove. FIG. 7 is an explanatory view of the annular sealing material in the second embodiment of the present invention in which the bulging portion is deformed by the fluid, and FIG. 7 (a) shows the annular sealing material in a state where the fluid is introduced from the sealing groove. FIG. 7B is an explanatory diagram of the annular sealing material in a state where the fluid is introduced from the seal groove and the fluid is generated from the inside to the outside of the housing portion. FIG. 8 is an explanatory view showing another form of the seal groove to which the annular seal material of the present invention is attached. FIG. 9 is a cross-sectional view of a conventional annular sealing material. FIG. 10 is a cross-sectional view for explaining a situation where a conventional annular sealing material is mounted in a seal groove. FIG. 11 is an explanatory view of a conventional annular sealing material in which a bulging portion is deformed by a fluid. FIG. 11 (a) is an explanatory view of the annular sealing material in a state where a fluid is introduced from a sealing groove, and FIG. ) Is an explanatory view of the annular sealing material in a state where the fluid is introduced from the seal groove and the fluid is generated from the inside to the outside of the housing portion.

Hereinafter, embodiments of the present invention will be described in more detail based on the drawings.
The annular sealing material of the present invention is used for sealing between a housing portion and a lid of a processing pot used for, for example, fumigation processing.

<First Embodiment>
First, as shown in FIG. 1, the annular sealing material 10a according to the first embodiment of the present invention has a substantially Y-shaped cross section, and a bulging portion 12 that comes into contact with the contact surface, The first lip portion 14 and the second lip portion 16 are respectively formed on the radially inner peripheral side 20 and the radially outer peripheral side 22 and continuously extended from the bulging portion 12. A recess 24 is formed between the first lip portion 14 and the second lip portion 16.

  The material of the annular sealing material 10a is not particularly limited as long as it is used for a normal sealing material. For example, nitrile rubber, hydrogenated nitrile rubber, fluorine rubber, silicone rubber, urethane rubber, ethylene propylene rubber (EPDM), etc. Various synthetic rubber materials can be used.

Among them, it is preferable to use silicone rubber or ethylene propylene rubber (EPDM) which is excellent in both sealing performance and shape retention.
As a particularly characteristic configuration, a protrusion-preventing backup ring 92 made of a material harder than the main body portion 18 is disposed at the corner portion 32 located on the radially outer peripheral side 22 of the bulging portion 12.

  The protruding prevention backup ring 92 may be made of any material as long as it is harder than the main body portion 18, but it is preferable to use, for example, high density polyester or polyacetal.

  On the other hand, the first lip portion 14 and the second lip portion 16 have a bulging portion as it goes from the leading end to the trailing end when the side continuous with the bulging portion 12 is the leading end and the opposite side is the trailing end. It is comprised so that it may spread outward rather than the width | variety of 12.

The expansion width T2 between the first lip portion 14 and the second lip portion 16 is preferably about 1.30 to 1.40 times the width T1 of the bulging portion 12.
The first lip portion 14 and the second lip portion 16 are set so that the thickness T3 is substantially the same from the front end to the rear end.

  When the annular sealing material 10a of the present invention configured as described above is mounted in the seal groove 60 provided in the lid 50 of the processing pot 80, as shown in FIG. The sealing material 10a is mounted such that the first lip portion 14 and the second lip portion 16 side are located on the bottom 62 side of the seal groove 60 and the bulging portion 12 is located on the opening 63 side.

  The width T4 of the seal groove 60 is preferably about 0.95 to 1.05 times the width T1 of the bulging portion 12. By setting such a width T4, it is easy to mount the annular sealing material 10a in the seal groove 60, and between the inner diameter side surface 66 of the sealing groove 60 and the inner diameter side 20 of the annular sealing material 10a. And, the sealing performance between the outer diameter surface 68 of the seal groove 60 and the outer diameter side 22 of the annular sealing material 10a can be ensured.

  Then, the protrusion preventing backup ring 92 is continuously mounted. When the protrusion preventing backup ring 92 is mounted in the seal groove 60 together with the main body section 18, the main body section 18 is prevented from falling out. It has the form which can be caught with respect to.

  Although it does not specifically limit as such a form, For example, it is set as the reverse taper shape as shown in FIGS. 1-4, or the shape (not shown) which can be mutually fitted like a puzzle. This can be determined in consideration of the ease of processing.

  Further, the protrusion preventing backup ring 92 does not have to be annular. For example, as shown in FIG. 3, a plurality of linear division bodies 98 formed in accordance with the outer peripheral length of the annular sealing material 10a are used. The divided bodies 98 may be mounted in the seal groove 60 so as to overlap each other.

  Thereby, the backup ring 92 for preventing protrusion is arranged so as to close the gap between the lid 50 and the accommodating portion 40, and between the inner diameter side surface 66 of the seal groove 60 and the inner diameter side 20 of the annular seal member 10a, In addition, the space between the radially outer surface 68 of the seal groove 60 and the radially outer peripheral side 22 of the annular sealing material 10a is sealed.

  Then, as shown in FIG. 4A, when the fluid 70 is introduced into the seal groove 60 from the fluid introduction hole 64 on the bottom 62 side of the seal groove 60 formed in the lid 50, the recess 24 of the annular seal material 10a. Receives the fluid 70, the annular sealing material 10 a moves toward the opposing accommodating portion 40, the bulging portion 12 comes into contact with the abutting surface 42 of the accommodating portion 40, and the gap between the bulging portion 12 and the accommodating portion 40 is reached. Will be sealed.

Here, the fluid 70 introduced into the seal groove 60 is not particularly limited, but a gas is preferable, and nitrogen gas is particularly preferable because it is easy to handle.
Next, as shown in FIG. 4 (b), when a fluid 72 such as carbon dioxide gas is introduced into the housing portion 40 and pressure is generated from the inside of the housing portion 40 to the outside, it will bulge in the future. The corner portion 30 on the radially inner peripheral side 20 of the portion 12 is crushed to the radially outer peripheral side 22, but the corner portion 32 on the radially outer peripheral side 22 is prevented from protruding so as to close the gap between the lid 50 and the accommodating portion 40. Since the backup ring 92 is positioned, no protrusion is caused between the lid 50 and the accommodating portion 40.

  In addition, since the first lip portion 14 and the second lip portion 16 are configured to expand outward from the width T1 of the bulging portion 12, an annular sealing material 10a is mounted in the seal groove 60. In this case, the first lip portion 14 and the second lip portion 16 are firmly in contact with the radially inner surface 66 and the radially outer surface 68 of the seal groove 60.

  Even if the fluid 70 is introduced into the seal groove 60 from the bottom 62 side of the seal groove 60, the first lip portion 14 and the second lip portion 16 stop the fluid 70, and the fluid 70 is within the diameter of the seal groove 60. It is possible to reliably prevent leakage from between the side surface 66 and the radially inner side 20 of the annular seal member 10a and the radially outer surface 68 of the seal groove 60 and the radially outer side 22 of the annular seal member 10a.

  The first lip portion 14 and the second lip portion 16 are set so as to have substantially the same thickness T3 from the front end to the rear end, so that the rear end is not turned up by the fluid 70. Further, there is no possibility that the fluid 70 leaks from the inner diameter side surface 66 of the seal groove 60 and the inner diameter side 20 of the annular sealing material 10a and from the outer diameter surface 68 of the sealing groove 60 and the outer diameter side 22 of the annular sealing material 10a. Is.

  Therefore, the annular sealing material 10a is not inclined in the seal groove 60, thereby preventing the product life of the annular sealing material 10a from being shortened, further preventing generation of particles and tearing, and the sealing groove 60. The fluid 70 introduced from the bottom 62 side of the inner circumferential surface 66 of the sealing groove 60 and the inner circumferential side 20 of the annular sealing material 10a and the outer circumferential surface 68 of the sealing groove 60 and the outer circumferential side 22 of the annular sealing material 10a. The gap between the lid 50 and the accommodating portion 40 can be reliably sealed without leaking from the gap.

<Second Embodiment>
Next, an annular sealing material 10b according to a second embodiment of the present invention will be described with reference to FIGS.

  Since the annular sealing material 10b shown in FIGS. 5 to 7 has basically the same configuration as the annular sealing material 10a in the first embodiment shown in FIGS. The same reference numerals are assigned and detailed description thereof is omitted.

  The annular sealing material 10b shown in FIG. 5 is provided with a backup ring 92 for preventing protrusion at the corner portion 32 on the outer diameter side 22 and for preventing protrusion at the corner portion 30 on the inner diameter side 20. It differs from the annular seal material 10a of the first embodiment in that a chamfered portion 90 is formed.

  When the annular seal member 10b is mounted in the seal groove 60, the protrusion 50 is chamfered by the protrusion preventing chamfered portion 90 provided in the corner portion 30 on the inner diameter side 20 as shown in FIG. It will be in the state away from the clearance gap with the accommodating part 40. FIG.

  For this reason, as shown in FIG. 7A, even if the fluid 70 is introduced from the bottom 62 side of the seal groove 60, the corner portion 30 of the annular seal member 10 b remains between the lid 50 and the housing portion 40. Therefore, it does not cause protrusion.

  As shown in FIG. 7B, even when a fluid 72 such as carbon dioxide gas is introduced into the housing portion 40 and pressure is generated from the inside of the housing portion 40 toward the outside, the diameter is also reduced. The corner portion 32 on the outer peripheral side 22 has a protrusion preventing backup ring 92 positioned so as to close the gap between the lid 50 and the accommodating portion 40, and therefore, the corner portion 32 does not protrude between the lid 50 and the accommodating portion 40. It does not occur.

  Therefore, the annular sealing material 10b in the present embodiment does not protrude between the lid 50 and the accommodating portion 40. Therefore, the annular sealing material 10b does not tilt in the seal groove 60, and the fluid 70 is sealed. It is possible to reliably prevent leakage from the inner diameter side surface 66 of the groove 60 and the inner diameter side 20 of the annular seal material 10a and the outer diameter surface 68 of the seal groove 60 and the outer diameter side 22 of the annular seal material 10a. Generation of particles and tearing can be prevented.

  5 to 7, the chamfered shape of the protrusion preventing chamfer 90 is a C chamfer of 45 degrees, but may be, for example, an R chamfer. As long as this portion is chamfered so that 30 is eliminated, the shape may be any shape, and the shape is not particularly limited.

  In addition, if the range where the protrusion preventing chamfered portion 90 is provided is made larger than necessary, the portion of the bulging portion 12 that comes into contact with the contact surface 42 becomes too small and the space between the bulging portion 12 and the contact surface 42 is reduced. Therefore, it is preferable to determine the size of the protrusion preventing chamfered portion 90 in consideration of the desired sealing performance.

  Therefore, the annular sealing material 10b in the second embodiment can surely seal between the lid 50 and the accommodating portion 40 more reliably than the annular sealing material 10a in the first embodiment.

  As described above, the annular sealing material 10 in the first embodiment and the second embodiment has the above-described form, so that the fluid 70 introduced from the bottom 62 side of the seal groove 60 is in the seal groove 60. The lid 50 and the accommodating portion 40 do not leak from the inner diameter side surface 66 and the inner diameter side 20 of the annular seal member 10 and from the outer diameter surface 68 of the seal groove 60 and the outer diameter side 22 of the annular seal member 10. However, the form of the seal groove 60 in which the annular sealing material 10 is mounted is not limited to that used in the above description. .

  For example, in the embodiment, a straight seal groove 60 is illustrated. However, as shown in FIG. 8, notches 94, 94 are formed on the radially inner side surface 66 and the radially outer surface 68 of the seal groove 60. 96 may be provided.

  The notches 94 and 96 are for preventing the annular sealing material 10 from dropping from the seal groove 60 when the processing pot 80 is opened and the load due to the fluids 70 and 72 is eliminated.

  In this embodiment, the protrusion preventing backup ring 92 is disposed at the corner portion 32 on the radially outer peripheral side 22 of the annular sealing material 10, but both sides of the corner portion 30 on the radially inner peripheral side 20 are provided on both sides. 20 and 22 may be used. In short, these positions may be set in accordance with the direction in which the annular sealing material 10 is deformed by receiving pressure.

  Thus, the annular sealing material 10 of the present invention can be variously modified without departing from the object of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Ring seal material 10a ... Ring seal material 10b ... Ring seal material 12 ... Bulging part 14 ... 1st lip part 16 ... 2nd lip part 18 ... Body part 20 ... .. Inner diameter side 22 ... Outer diameter side 24 ... Recess 30 ... Corner part 32 ... Corner part 40 ... Housing part 42 ... Contact surface 50 ... Cover Body 52: Mounting surface 60 ... Seal groove 62 ... Bottom 63 ... Opening 64 ... Fluid introduction hole 66 ... Radial inner surface 68 ... Radial outer surface 70 ... Fluid 72・ ・ ・ Fluid 80 ・ ・ ・ Processing pot 90 ・ ・ ・ Chamfering part for preventing protrusion 92 ・ ・ ・ Backup ring for preventing protrusion 94 ・ ・ ・ Notch part 96 ・ ・ ・ Notch part 98 ・ ・ ・ Partition body T1 ・・ Width of bulge T2 ・ ・ Expanded width of first lip and second lip T3 ・ ・ Lip Thickness T4 ··· Seal groove width 100 ··· ring seal material 102 ··· bulging portion 104 ··· first lip portion 106 ··· second lip portion 108 ··· body portion 110 ··· diameter Inner peripheral side 112... Outer peripheral side 114... Recess 116... Corner portion 118... Corner portion 200. ··· Lid 222 ··· Mounting surface 230 ··· Seal groove 232 ··· Bottom portion 234 ··· Fluid introduction hole 236 · · · Radial inner surface 238 · · · Radial outer surface 240 ··· Opening 300・ Fluid 302 ... Fluid

Claims (4)

It is mounted in an annular seal groove formed on the mounting surface of the mounting member, and the fluid is introduced from the bottom of the seal groove after the mounting surface of the mounting member and the contact surface of the contact member are opposed to each other. An annular sealing material that is pressed against the contact surface and thereby seals between the mounting member and the contact member,
When the annular sealing material is mounted in the seal groove, in its cross section,
A bulging portion disposed so as to be positioned on the opening side of the seal groove, and bulging to a contact surface side from the mounting surface;
A first lip portion and a second lip disposed so as to be located on the bottom side of the seal groove and continuously extending from the bulge portion along the radially inner side surface and the radially outer side surface of the seal groove, respectively. And
A main body having at least
Furthermore, the main body is
An annular backup ring made of a material harder than the main body is disposed in a corner portion located on the inner diameter side and / or outer diameter side of the bulging part. Seal material.   2. The annular sealing material according to claim 1, wherein a protrusion preventing chamfered portion is formed at a corner portion opposite to the corner portion where the protrusion preventing backup ring is disposed. The first lip portion and the second lip portion are
When the side continuous with the bulging portion is the front end and the opposite side is the rear end,
3. The annular sealing material according to claim 1, wherein the annular sealing material is configured to expand outward from the width of the bulging portion as it goes from the front end to the rear end. The first lip portion and the second lip portion are
The annular sealing material according to claim 3, wherein the annular sealing material is configured to have substantially the same thickness from the front end to the rear end.

Images