WO2016072087A1 - Joint d'étanchéité - Google Patents

Joint d'étanchéité Download PDF

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Publication number
WO2016072087A1
WO2016072087A1 PCT/JP2015/005507 JP2015005507W WO2016072087A1 WO 2016072087 A1 WO2016072087 A1 WO 2016072087A1 JP 2015005507 W JP2015005507 W JP 2015005507W WO 2016072087 A1 WO2016072087 A1 WO 2016072087A1
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WO
WIPO (PCT)
Prior art keywords
gasket
fluid
leakage
annular member
side annular
Prior art date
Application number
PCT/JP2015/005507
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English (en)
Japanese (ja)
Inventor
穣 寺西
健太郎 木村
Original Assignee
ニチアス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ニチアス株式会社 filed Critical ニチアス株式会社
Publication of WO2016072087A1 publication Critical patent/WO2016072087A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing

Definitions

  • the present invention relates to a gasket, and more particularly to a gasket capable of effectively reducing permeation leakage and contact surface leakage with respect to a fluid that permeates rubber such as gasoline.
  • gasket leakage consists of contact surface leakage and permeation leakage.
  • the contact surface leak refers to a leak that passes between the gasket surface and the flange surface that tightens the gasket
  • the permeation leak refers to a leak that permeates the gasket itself.
  • the NBR (nitrile rubber) gasket has a drawback that NBR has a good balance of oil resistance, cold resistance and mechanical properties, but has a large permeation leakage to gasoline.
  • a gasket made of a vulcanized product of a fluororubber compound, that is, a so-called fluororubber gasket has been put into practical use. Etc. were requested.
  • Patent Document 1 discloses a piping gasket that is arranged between a plurality of pipe members through which a fluid flows and is formed in a ring shape having a predetermined width dimension that seals the joints of both pipe members. It is disclosed.
  • the inner end portion on the center side in the radial direction is formed of a highly resistant resin material.
  • Patent Document 2 also includes a jacket ring member that has a groove that extends substantially along the circumferential direction and has a substantially U-shaped radial cross section, and a groove formed in the jacket ring member.
  • the sealing material characterized by becoming is disclosed.
  • Patent Document 3 includes a ring-shaped gasket body made of a vulcanized body rubber compound based on NBR rubber and a vulcanized rubber compound based on a fluororubber.
  • a rubber gasket characterized by comprising a barrier layer to be formed is disclosed.
  • Patent Document 4 in a carrier gasket having a carrier portion attached to a connecting portion such as an intake manifold or a fuel tank, concave grooves are formed on the front side and the back side of the carrier portion, and the concave groove has a front side. , Characterized in that a seal portion having a protrusion protruding beyond the back surface is formed, and the protrusions on the front seal portion and the protrusions on the back seal portion are arranged in different numbers or shapes. Carrier gaskets and the like are disclosed.
  • this Patent Document 4 describes a carrier gasket (see FIG. 10) in which a protrusion on the front side seal part and a protrusion on the back side seal part are formed in substantially the same shape and dimensions as a conventional technique. Yes.
  • the present invention has been proposed in view of the above circumstances, and an object of the present invention is to provide a gasket that can effectively reduce permeation leakage and contact surface leakage and is excellent in economic efficiency.
  • a gasket according to the present invention has a rubber-shaped anti-fluid-side annular member and a cross-sectional shape that is in close contact with the anti-fluid-side annular member on the fluid side of the anti-fluid-side annular member.
  • a fluid-side annular member, and the fluid-side annular member has a lower permeability to vaporized gas from volatile oil than the anti-fluid-side annular member, the thickness T of the anti-fluid-side annular member, and In the thickness t of the fluid-side annular member, T> t.
  • the fluid-side annular member first seals the fluid even if the fluid is a vaporized gas from volatile oil such as gasoline that permeates the rubber.
  • the anti-fluid-side annular member can seal against contact surface leakage of the fluid-side annular member and reduce contact surface leakage. That is, this gasket can effectively reduce the leakage of the contact surface and the permeation through the tandem structure with respect to the fluid. Further, this gasket can have a simple structure and can reduce the manufacturing cost.
  • FIG. 1 is a schematic view of a gasket according to an embodiment of the present invention, in which (a) is a plan view and (b) is an end view showing an AA enlarged cross section.
  • FIG. 2 is a schematic enlarged cross-sectional view for explaining a use state of the gasket according to the embodiment of the present invention.
  • FIG. 3 is a graph illustrating the measurement results of the leakage amount in the example and the comparative example.
  • FIG. 4 shows a graph for explaining the measurement result of the leakage amount with respect to the compression rate in the examples and comparative examples.
  • FIG. 5 shows a schematic cross-sectional view for explaining the test apparatus.
  • FIG. 6 is a graph illustrating measurement results of the liquid leakage amount, the gas leakage amount, and the permeation leakage actual amount in Examples and Comparative Examples.
  • the gasket 1 of the present embodiment is configured to include an O-ring 2 and a fluid-side annular member 3 as anti-fluid-side annular members.
  • the gasket 1 is a fuel tank gasket, and is attached to a cap portion for supplying an engine to a fuel tank (not shown) of an automobile, and seals fuel such as gasoline.
  • the use of the gasket of this invention is not limited to the case where it uses for a fuel tank, A various use may be sufficient.
  • the O-ring 2 is made of rubber and has an annular shape with a circular cross section.
  • the material of the O-ring 2 of this embodiment is NBR (nitrile rubber), but is not limited to this.
  • NBR nitrile rubber
  • HNBR hydrogenated nitrile rubber
  • U urethane rubber
  • ACM acrylic rubber
  • FKM fluoro rubber
  • the O-ring 2 is an annular shape, but is not limited to this.
  • the O-ring 2 may be a rectangular shape depending on the shape of the cap portion.
  • the anti-fluid-side annular member is the O-ring 2, but is not limited to this, and may be, for example, a square ring, a D ring, an X ring, or the like.
  • the fluid-side annular member 3 is made of a fluorine-based resin, is in close contact with the O-ring 2 on the fluid side of the O-ring 2 and has a substantially rectangular cross-sectional shape.
  • the fluororesin is PTFE (polytetrafluoroethylene) or PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer). If it does in this way, the fluid side annular member 3 can reduce effectively the permeation
  • the fluororesin is not limited to PTFE or PFA.
  • FEP tetrafluoroethylene / hexafluoropropylene copolymer
  • ETFE ethylene / tetrafluoroethylene copolymer
  • PVDF polyvinylidene
  • the fluid-side annular member 3 has a substantially rectangular cross section. That is, the fluid-side annular member 3 has an annular shape with a width w, and has an upper surface and a lower surface that face each other. These surfaces abut against the flange 4 to reduce contact surface leakage.
  • the cross-sectional shape is substantially rectangular means that, for example, the side surface on the anti-fluid side is curved as described later.
  • the fluid side annular member 3 may have one or two or more annular convex portions for reducing contact surface leakage on the upper and lower surfaces facing each other.
  • the width w of the fluid-side annular member 3 is 1 mm to 10 mm. If it does in this way, the fluid side annular member 3 can reduce a contact surface leak, and can aim at the cost reduction of manufacturing cost.
  • the reason for limiting the above numerical values is that if the thickness is less than 1 mm, the sealing performance for reducing contact surface leakage may not be sufficiently exhibited. On the other hand, if the thickness exceeds 10 mm, the effect on the contact surface leakage is reduced, and many materials are used unnecessarily, and the manufacturing cost may not be reduced.
  • the fluid-side annular member 3 is in close contact with the O-ring 2 on the fluid side of the O-ring 2 (in this embodiment, the inner peripheral side of the O-ring 2). That is, the cross-sectional shape of the fluid-side annular member 3 is such that the portion on the anti-fluid side is curved corresponding to the cross-sectional shape of the O-ring 2. In this way, when the gasket 1 is tightened by the flange 4, no space (not shown) is formed between the O-ring 2 and the fluid-side annular member 3. If this space is formed, vaporized gas from volatile oil such as gasoline leaked in contact with the fluid-side annular member 3 accumulates in the space and causes permeation leakage to the O-ring 2. It becomes. That is, since the fluid-side annular member 3 is in close contact with the O-ring 2 on the fluid side of the O-ring 2, the above-described space is not formed, so that permeation leakage to the O-ring 2 can be effectively prevented. .
  • the gasket 1 of this embodiment has a fluid inside, and has a radial tandem structure as a fluid-side annular member 3 and an O-ring 2 from the center toward the outside.
  • the present invention is not limited to this.
  • the tandem structure in the radial direction is formed from the center toward the outside, It is good also as a fluid side annular member.
  • the tandem structure in the radial direction may be a fluid-side annular member, an anti-fluid-side annular member, and a fluid-side annular member from the center toward the outside.
  • the close contact is usually performed by being hooked on a curved concave portion on the outer peripheral side surface of the fluid-side annular member 3 in a state where the diameter of the O-ring 2 is expanded by a minute distance. If it does in this way, the gasket 1 can be assembled easily and the cost reduction of a manufacturing cost can be aimed at. However, it is not limited to this, For example, you may use an adhesive agent etc. Further, for example, although not shown, a convex portion is formed on the inner peripheral side of the O-ring 2, and the convex portion is engaged with a concave portion formed on the outer peripheral side surface of the fluid-side annular member 3. Good. If it does in this way, it can be set as the structure which the assembled
  • the gasket 1 satisfies d> t in the diameter d of the O-ring 2 and the thickness t of the fluid-side annular member 3. In this way, when the flange 4 tightens the gasket 1, the O-ring 2 is also compressed in a state in which the fluid-side annular member 3 is compressed. And the fuel such as gasoline can be effectively sealed by the O-ring 2.
  • the reason for the above numerical limitation is that if the gasket is less than 1.1, the compression rate of the O-ring 2 becomes insufficient when the gasket 1 is compressed, and the sealing performance by the O-ring 2 may not be sufficiently exhibited. is there.
  • the ratio exceeds 1.4, the compression ratio of the fluid-side annular member 3 becomes insufficient when compressed, and the sealing performance by the fluid-side annular member 3 may not be sufficiently exhibited. Further, in handling, the O-ring 2 is easily detached from the fluid-side annular member 3, and workability and the like may be reduced.
  • the usage state etc. of the gasket 1 of the said structure are demonstrated with reference to drawings.
  • the gasket 1 is fastened by a pair of flanges 4, and the distance between the flanges 4 is t 0 (t 0 ⁇ t). Therefore, the compression rate of the fluid-side annular member 3 is ((t ⁇ t 0 ) / t) ⁇ 100 (%), and the compression rate of the O-ring 2 is ((d ⁇ t 0 ) / d) ⁇ 100. (%).
  • the fluid-side annular member 3 first seals against the vaporized gas (suitably abbreviated as fluid) from volatile oil.
  • the fluid-side annular member 3 is made of a fluorine-based resin, so that permeation leakage can be effectively reduced.
  • the fluid side annular member 3 is mounted at a compression rate of ((t ⁇ t 0 ) / t) ⁇ 100 (%), the fluid is sealed so as to reduce the contact surface leakage.
  • a small amount of contact surface leakage occurs.
  • the gasket 1 is attached so that the O-ring 2 attached at a compression rate of ((dt ⁇ 0 ) / d) ⁇ 100 (%) reduces the contact surface leakage.
  • the fluid can be sealed to further reduce contact surface leakage. That is, the gasket 1 can effectively reduce permeation leakage and contact surface leakage by having the above-described tandem structure with respect to the fluid. Further, the gasket 1 can have a simple structure and can reduce the manufacturing cost.
  • the creep phenomenon means a phenomenon in which deformation increases with time when a load is applied to a material.
  • the gasket 1 of the present embodiment it is possible to effectively reduce permeation leakage and contact surface leakage with respect to a fluid that permeates rubber such as gasoline. You can go down.
  • the gasket 1 is tightened with a flange 4 so that the compression rate of the fluid-side annular member 3 is 0.3% and the compression rate of the O-ring 2 is 28%, and the leakage amount to gasoline (contact surface leakage and The total amount of leakage due to permeation leakage) was measured.
  • the contact surface of the flange 4 was finished with Rz3.
  • the measurement result was 0.02 g of leakage at normal temperature (about 20 ° C.) + 96 hours, and 0.04 g of leakage at 40 ° C. + 96 hours (see FIG. 3).
  • the standard (provisional) leakage amount at normal temperature +96 hours is 0.07 g or less, which is half that of Comparative Example 2, and the standard (provisional) leakage amount at 40 ° C. + 96 hours is 0.09 g or less. did. Therefore, the gasket 1 of Example 1 obtained good results at room temperature and 40 ° C.
  • the 0.02 g leakage amount is considered to be the amount of transmission leakage (0.02 g) that has passed through PTFE and NBR.
  • the breakdown of the 0.04 g leakage amount is as follows: the amount of permeation leakage that has passed through PTFE and NBR (0.02 g) and the contact surface leakage of the fluid-side annular member 3 whose sealing performance has become unstable. It seems that this is the amount (0.02 g) that the O-ring 2 leaked without being sealed.
  • the measurement result was a leak amount of 0.31 g at normal temperature (about 20 ° C.) + 96 hours, and a leak amount of 1.65 g at 40 ° C. + 96 hours (see FIG. 3). Therefore, the gasket of Comparative Example 1 could not satisfy the standard (provisional) at normal temperature and 40 ° C.
  • Comparative Example 2 The gasket of Comparative Example 2 was an O-ring, and the inner diameter was 145.8 mm, the thickness (diameter d) was 5.7 mm, and the material was fluororubber. This gasket is tightened with flange 4 at a compression rate (6.5%) at which contact surface leakage was eliminated in a seal test at room temperature, and the amount of leakage to gasoline (total leakage due to contact surface leakage and permeation leakage) was measured.
  • the measurement result was a leakage amount of 0.14 g at room temperature (about 20 ° C.) + 96 hours, and a leakage amount of 0.18 g at 40 ° C. + 96 hours (see FIG. 3). Therefore, the gasket of Comparative Example 2 could not satisfy the standard (provisional) at normal temperature and 40 ° C.
  • the measurement result was 0.02 g leakage at normal temperature (about 20 ° C.) + 96 hours, and 0.14 g leakage at 40 ° C. + 96 hours (see FIG. 3). Therefore, the gasket of Comparative Example 3 was able to satisfy the standard (provisional) at room temperature, but could not satisfy the standard (provisional) at 40 ° C.
  • the leakage amount of 0.14 g is that the creep phenomenon occurs in PTFE at about 40 ° C., the sealing performance of the gasket becomes unstable, and the leakage amount due to contact surface leakage increases. Seem.
  • the compression rate was changed with respect to the gasket 1 of Example 1 and the gasket of Comparative Example 1, and the amount of leakage was measured at 40 ° C. + 96 hours.
  • the measurement result of the gasket of Comparative Example 1 did not satisfy the standard (provisional) at 40 ° C., although the leakage amount decreased when the compression rate was increased.
  • the measurement result in the gasket 1 of Example 1 shows that when the compression rate is increased, the leakage amount is reduced, and when the compression rate of the O-ring 2 is about 20% or more, the standard (provisional) at 40 ° C.
  • this gasket 1 it is preferable that the O-ring 2 is compressed and the fluid-side annular member 3 is also compressed. However, when the compression rate of the O-ring 2 is about 20% or more, the fluid-side annular member 3 is compressed. Even if they were not in contact, the standard at 40 ° C. (provisional) could be satisfied.
  • the test apparatus 10 used for this test includes a container body 11 and a cover plate 12, and the container body 11 and the cover plate 12 are sealed by the gasket 1.
  • the cover plate 12 when measuring the leakage amount with respect to the fuel 100 in a gaseous state, as shown in FIG. 5A, the cover plate 12 is positioned above the container body 11, and the gasket 1 is vaporized. In contact with the spent fuel 100. The amount of leakage at this time is referred to as gas leakage (see FIG. 6).
  • the container body 11 is positioned above the cover plate 12, and the gasket 1 Contact with liquid fuel 100.
  • the amount of leakage at this time is referred to as the amount of liquid leakage (see FIG. 6).
  • the contact surface (flange surface) of the container main body 11 and the lid plate 12 at this time was finished with Rz3.
  • the gasket 1 was tightened so that the compression rate of the fluid-side annular member 3 was 0.3% and the compression rate of the O-ring 2 was 28%.
  • the leakage amount measured in the state of FIG. 5B under the same conditions as the test apparatus 10 except that the contact surface is mirror-finished (Rz0.4) is referred to as the permeation leakage substance amount (see FIG. 5). 6).
  • the leakage amount was 0.14 g at room temperature + 96 hours. Further, when the gasoline leakage amount (liquid leakage amount) was measured in the state of FIG. 5B, the leakage amount was 0.17 g at room temperature (about 20 ° C.) + 96 hours. Furthermore, when the contact surface was mirror-finished (Rz0.4), the amount of gasoline leaked (substance of permeation leakage) was measured in the state of FIG. 5B, and found to be 0.10 g at room temperature + 96 hours. The amount of leakage. The breakdown of the leakage amount of 0.17 g was 0.10 g due to permeation leakage and 0.07 (0.17-0.10) g due to contact surface leakage.
  • the gasket 1 of Example 1 was able to effectively reduce permeation leakage and contact surface leakage with respect to a fluid that permeates rubber such as gasoline as compared with the gaskets of the respective comparative examples. .
  • gasket according to the present invention has been described with reference to the preferred embodiment.
  • the gasket according to the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. It goes without saying that it is possible.
  • the fluid-side annular member 3 is made of a fluorine-based resin. It can be formed using a material having a low permeability to the vaporized gas.
  • the gasket 1 is used as a flat surface fixing gasket
  • the gasket of the present invention is not shown, but may be applied to a cylindrical surface gasket.
  • the fluid-side annular member has a substantially cylindrical shape having an outer peripheral surface and an inner peripheral surface.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gasket Seals (AREA)

Abstract

La présente invention concerne un joint d'étanchéité (1) comportant un joint torique en caoutchouc (2) et un élément annulaire (3) côté fluide qui a une section transversale sensiblement rectangulaire et qui est disposé en contact étroit avec le joint torique (2) sur le côté fluide du joint torique (2), l'élément annulaire (3) côté fluide présentant une perméabilité par rapport à un gaz vaporisé émanant d'une huile volatile qui est inférieure à la perméabilité du joint torique (2), et étant conçu de sorte que l'épaisseur (t) de l'élément annulaire (3) côté fluide soit inférieure au diamètre (d) du joint torique (2). Par conséquent, l'invention pourvoit à un joint d'étanchéité au moyen duquel il est possible de réduire de manière efficace une fuite par perméation et une fuite de surface de contact, le joint d'étanchéité présentant d'exceptionnelles performances économiques.
PCT/JP2015/005507 2014-11-04 2015-11-02 Joint d'étanchéité WO2016072087A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-224627 2014-11-04
JP2014224627A JP2016089936A (ja) 2014-11-04 2014-11-04 ガスケット

Publications (1)

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WO2016072087A1 true WO2016072087A1 (fr) 2016-05-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111164338A (zh) * 2018-01-15 2020-05-15 Nok株式会社 密封结构以及用于该密封结构的密封件

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101952809B1 (ko) * 2017-04-13 2019-02-27 (주)유니엠 배관 연결용 가스켓 및 이를 포함하는 배관 조립체
WO2024005166A1 (fr) * 2022-06-30 2024-01-04 大同工業株式会社 Chaîne

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08121599A (ja) * 1994-10-24 1996-05-14 Shionogi & Co Ltd サニタリ配管用ガスケット及びその製作方法
JPH10311429A (ja) * 1997-05-12 1998-11-24 Nichias Corp 補助輪付きｏリング
JP2001124210A (ja) * 1999-10-27 2001-05-11 Boc Group Plc:The シール組立体
JP2008164079A (ja) * 2006-12-28 2008-07-17 Nichias Corp ゴム／樹脂複合シール材

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08121599A (ja) * 1994-10-24 1996-05-14 Shionogi & Co Ltd サニタリ配管用ガスケット及びその製作方法
JPH10311429A (ja) * 1997-05-12 1998-11-24 Nichias Corp 補助輪付きｏリング
JP2001124210A (ja) * 1999-10-27 2001-05-11 Boc Group Plc:The シール組立体
JP2008164079A (ja) * 2006-12-28 2008-07-17 Nichias Corp ゴム／樹脂複合シール材

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111164338A (zh) * 2018-01-15 2020-05-15 Nok株式会社 密封结构以及用于该密封结构的密封件

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