JP2003322258A - Sheet gasket - Google Patents
Sheet gasketInfo
- Publication number
- JP2003322258A JP2003322258A JP2002128283A JP2002128283A JP2003322258A JP 2003322258 A JP2003322258 A JP 2003322258A JP 2002128283 A JP2002128283 A JP 2002128283A JP 2002128283 A JP2002128283 A JP 2002128283A JP 2003322258 A JP2003322258 A JP 2003322258A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- base material
- slit
- shaped
- sheet gasket
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Landscapes
- Gasket Seals (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、例えば各種配管、
圧力容器の継手部分や流体機器の接合部等のシール材と
して用いられるシートガスケットに関するもので、特
に、ガス系流体のように、浸透漏洩を発生しやすい流体
の漏れ防止に使用されるシートガスケットに関するもの
である。TECHNICAL FIELD The present invention relates to various pipes,
The present invention relates to a sheet gasket used as a sealing material for a joint part of a pressure vessel or a joint part of fluid equipment, and particularly to a sheet gasket used for preventing leakage of fluid such as gas-based fluid that easily causes permeation leakage. It is a thing.
【0002】[0002]
【従来の技術】この種のシートガスケットとして、従来
から知られているものには、次のようなものがある。
(1)ゴムと充填材とを抄造法または熱ロール法により
シート状に一体化してなるジョイントシートガスケット
(以下、従来品1という)。
(2)大正15年実用新案出願公告第29097号公報
に開示されているように、環状形のシート状基材の内外
方向の中間部分に、該シート状基材の表面に対して直角
に環状形の溝を設け、この溝内に不浸透性物質を充填し
てなるシートガスケット(以下、従来品2という)。
(3)特開平7−19342号公報に開示され、かつ、
図9に示すように、互いに異径の環状形の分割シート状
基材21,22を同一平面内で内外同心状に配置し、こ
れら両分割シート状基材21,22の内外対向周面間に
形成される表面に直角の隙間23内に、ゴム系あるいは
樹脂系のシーラントや樹脂接着材等の不浸透性物質24
を充填させて両分割シート状基材21,22を一体化し
てなるシートガスケット(以下、従来品3という)。
(4)特開平7−217743号公報に開示され、か
つ、図10に示すように、膨張黒鉛や多孔質ポリテトラ
フロロエチレン(以下、多孔質PTFEと称する)等の
ように、層状の内部構造を有する材料から形成されて内
外方向で複数に分割されたシート状基材21,22の互
いに内外方向で隣接する外端部分21Aと内端部分22
Aとを部分的に重ね合わせるとともに、その重ね合わせ
部分を含めて全体の肉厚がほぼ一様になるように加圧成
形することによって、重ね合わせ部分に、図11に明示
するように、その肉厚方向を階段状に横断する形態の高
密度層25Aを形成させてなるシートガスケット(以
下、従来品4という)。2. Description of the Related Art Conventionally known sheet gaskets of this type are as follows. (1) A joint sheet gasket (hereinafter referred to as conventional product 1) in which a rubber and a filler are integrated into a sheet by a papermaking method or a hot roll method. (2) As disclosed in Japanese Utility Model Application Publication No. 29097 of Taisho 15 (1990), an annular sheet-shaped substrate is annularly formed at an intermediate portion in the inner and outer directions at right angles to the surface of the sheet-shaped substrate. A sheet gasket (hereinafter referred to as the conventional product 2) having a groove of a shape and filling the groove with an impermeable substance. (3) disclosed in JP-A-7-19342, and
As shown in FIG. 9, annular divided sheet-shaped base materials 21 and 22 having different diameters are arranged concentrically inside and outside in the same plane, and the inner and outer facing peripheral surfaces of these divided sheet-shaped base materials 21 and 22 are arranged. In the space 23 formed at right angles to the surface formed on the inner surface, an impermeable substance 24 such as a rubber or resin sealant or a resin adhesive is formed.
A sheet gasket (hereinafter, referred to as conventional product 3) in which the two divided sheet-shaped base materials 21 and 22 are integrated by filling. (4) A layered internal structure such as expanded graphite or porous polytetrafluoroethylene (hereinafter referred to as porous PTFE) disclosed in JP-A-7-217743 and shown in FIG. Of the sheet-like base materials 21 and 22 formed of a material having the above and divided into a plurality of inner and outer directions, the outer end portion 21A and the inner end portion 22 being adjacent to each other in the inner and outer directions.
A and A are partially overlapped with each other, and pressure molding is performed so that the entire wall thickness including the overlapped portion is substantially uniform. A sheet gasket (hereinafter referred to as conventional product 4) formed by forming a high-density layer 25A having a shape that crosses the thickness direction stepwise.
【0003】[0003]
【発明が解決しようとする課題】上記した従来のシート
ガスケットのうち、従来品1は、高い締付け面圧を加え
て使用することにより、接面からの漏れは抑制ないし防
止可能であるものの、シート製造時にシート内部に層状
の構造が形成されるため、高い締付け面圧を加えて使用
したとしても、層状構造を経て外部に至る浸透漏れの発
生を防止することができない。Among the above-mentioned conventional sheet gaskets, the conventional product 1 is capable of suppressing or preventing leakage from the contact surface by using a high tightening surface pressure when used. Since a layered structure is formed inside the sheet during manufacturing, even if a high tightening surface pressure is applied and used, it is not possible to prevent the occurrence of permeation leakage to the outside via the layered structure.
【0004】一方、従来品2及び3はシート状基材の内
外方向の中間部分に不浸透性物質が存在し、また従来品
4はシート状基材の中間部分に高密度層が存在するため
に、従来品1に比べて、流体が層状の内部構造を通過し
て基材外周部に至る浸透漏れを著しく低減することが可
能である反面、従来品2及び3の場合は、シート状基材
の内外方向の中間部分に表面に対して直角な溝や隙間が
形成されることから、その溝や隙間を挟んで分割された
内外のシート状基材部の継ぎ部分の強度が低下してシー
トガスケット全体に亘って均一な強度を確保することが
できないばかりでなく、肉厚を揃えるための加圧成形時
の内外径方向への寸法変化に伴って、溝や隙間の寸法が
広がりやすく、その結果、中間部分の締付け面圧が減少
して漏れ防止性能が低下し、さらに、内外のシート状基
材部が相互に分離しやすくてガスケット本来のシール性
能が損なわれやすい。On the other hand, in the conventional products 2 and 3, the impermeable substance exists in the intermediate portion of the sheet-shaped substrate in the inner and outer directions, and in the conventional product 4, the high-density layer exists in the intermediate portion of the sheet-shaped substrate. In comparison with the conventional product 1, it is possible to significantly reduce the permeation leakage of the fluid passing through the layered internal structure and reaching the outer peripheral portion of the base material. On the other hand, in the case of the conventional products 2 and 3, the sheet-shaped substrate is used. Grooves and gaps that are perpendicular to the surface are formed in the middle part of the material inside and outside, so the strength of the joint part of the inner and outer sheet-like base material parts divided with the grooves and gaps is reduced. Not only is it impossible to ensure uniform strength over the entire sheet gasket, but it is easy for the dimensions of the grooves and gaps to widen due to dimensional changes in the inner and outer diameter directions during pressure molding for uniform wall thickness. As a result, the tightening surface pressure at the intermediate part is reduced and the leak prevention performance is improved. Reduced, further, it tends to be impaired original sealing performance gasket sheet substrate portion of the inside and outside are easily separated from each other.
【0005】また、従来品4の場合は、重ね合わせ部分
を有する内外の分割シート状基材21,22という二種
類の素材シートを各別に作製準備する必要があるため
に、材料費及び加工費が高くなり、製品コストが上昇し
やすいという問題が残されていた。Further, in the case of the conventional product 4, since it is necessary to separately prepare two kinds of material sheets, that is, the inner and outer divided sheet-shaped base materials 21 and 22 having overlapping portions, material costs and processing costs are required. However, the problem remains that the product cost is likely to increase due to the high cost.
【0006】本発明は上記実情に鑑みてなされたもの
で、一種類の素材シートのみ用いて製品コストの低減を
図り、かつ、全体に亘って均一な強度を確保しつつ、浸
透漏れの著しい減少を図って高いシール性能を発揮させ
ることができるシートガスケットを提供することを目的
としている。The present invention has been made in view of the above-mentioned circumstances, and it is intended to reduce the product cost by using only one kind of material sheet and to secure the uniform strength over the whole, while significantly reducing the permeation leakage. It is an object of the present invention to provide a sheet gasket capable of exhibiting high sealing performance.
【0007】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明に係るシートガスケットは、層状の内部構造
を有する材料から環状形に形成されるシート状基材の内
外方向の中間部分に、該シート状基材の表面に対して傾
斜したスリットを形成し、この傾斜スリツト部分を含め
てシート状基材全体をほぼ一様な肉厚になるように加圧
成形して前記中間部分に高気密層を形成していることを
特徴とするものである。In order to achieve the above-mentioned object, a sheet gasket according to the present invention has a sheet-like base material formed in a ring shape from a material having a layered internal structure at an intermediate portion in the inner and outer directions. Forming a slit inclined with respect to the surface of the sheet-like base material, press-molding the entire sheet-like base material including the inclined slit portion so as to have a substantially uniform thickness, It is characterized by forming a highly airtight layer.
【0008】上記構成のシートガスケットのシート状基
材における前記スリットとしては、シート状基材の厚み
方向を横断しないで基材の一部が繋がったまま残り、加
圧成形時に高気密層がガスケットの厚み方向を横断する
ような深さに形成されたものであっても、請求項2に記
載のように、シート状基材の厚み方向を横断して形成さ
れ、この横断スリットにより分割された内外方向で複数
個の分割シート状基材の傾斜面同士を互いに密接させて
加圧成形することにより、分割シート状基材が高気密層
を介して一体化されるようにしてもよい。As the slits in the sheet-shaped substrate of the sheet gasket having the above-mentioned structure, a part of the substrate remains connected without traversing the thickness direction of the sheet-shaped substrate, and the highly airtight layer is formed by the gasket during pressure molding. Even if it is formed to have a depth that traverses the thickness direction of the sheet-like base material, it is formed so as to traverse the thickness direction of the sheet-like base material and divided by the transverse slits. The divided sheet-shaped base materials may be integrated via the highly airtight layer by bringing the inclined surfaces of the plurality of divided sheet-shaped base materials into intimate contact with each other in the inner and outer directions to perform pressure molding.
【0009】前記シート状基材の厚み方向を横断して形
成されるスリットとしては、直線状のものであってもよ
いが、特に、請求項3に記載のように、断面形状が>形
または略X形であることが好ましい。The slit formed across the thickness direction of the sheet-like base material may be linear, but in particular, as described in claim 3, the cross-sectional shape is> shaped or It is preferably substantially X-shaped.
【0010】また、上記構成のシートガスケットにおけ
る高気密層は、請求項4に記載のように、加圧成形によ
って材料の配向状態及び密度のうちの少なくとも一方が
高められて形成されたものであればよいが、最も好まし
くは、高密度で、かつ高配向状態に形成されることが望
ましい。Further, the highly airtight layer in the sheet gasket having the above-mentioned structure may be formed by increasing at least one of the orientation state and the density of the material by pressure molding as described in claim 4. However, it is most preferable that the high density and highly oriented state is formed.
【0011】さらに、上記構成のシートガスケットにお
けるシート状基材を形成する材料としては、請求項5に
記載のように、膨張黒鉛、多孔質PTFE、ビータシー
ト、ジョイントシートまたは抄造ペーパーのうちから選
択されたものを使用する。Further, as the material for forming the sheet-shaped base material in the sheet gasket having the above-mentioned constitution, as described in claim 5, it is selected from expanded graphite, porous PTFE, beater sheet, joint sheet or papermaking paper. Use the one that was given.
【0012】さらにまた、上記構成のシートガスケット
における高気密層には、請求項6に記載のように、例え
ば油や樹脂等の不浸透性物質を充填させることが望まし
い。Furthermore, it is desirable that the highly airtight layer in the sheet gasket having the above-mentioned structure is filled with an impermeable substance such as oil or resin as described in claim 6.
【0013】上記のような構成要件を有する本発明によ
れば、シート状基材の内外方向の中間部分に形成された
傾斜スリット部分を含めて全体をほぼ一様な肉厚になる
ように加圧成形して内外方向の中間部分に基材表面に対
して傾斜する高気密層が形成されているので、傾斜スリ
ットがシート状基材の厚み方向を横断してシート状基材
が内外方向で複数個に分割されるような形態のものであ
っても、基材表面に対して直角な溝や隙間を形成して内
外方向で複数個のシート状基材に分割する従来品2や3
に比べて、分割シート状基材の継ぎ部分の強度低下がな
く、ガスケット全体に亘って均一な強度を確保すること
が可能である。また、内外方向に所定幅を有する一種類
のシート状基材(素材シート)を作製し、その中間部に
傾斜スリットを形成すればよいので、二種類の素材シー
トを各別に作製準備する必要がある従来品3に比べて、
材料費及び加工費を低減して製品(シートガスケット)
の著しいコストダウンが図れる。それでいて、加圧成形
時の内外径方向への寸法変化を傾斜面のすべりで吸収す
るとともに、傾斜面に大きな加圧力を付与して高密度層
を確実に形成してシート状基材の内部構造層を経て外部
に至る浸透漏れの発生を著しく減少し、ガスケット全体
のシール性能を高めることが可能である。According to the present invention having the above-mentioned constitutional requirements, the entire sheet including the inclined slit portion formed in the intermediate portion in the inner and outer directions of the sheet-shaped substrate is added to have a substantially uniform thickness. Since a highly airtight layer that is pressure-formed and is inclined with respect to the base material surface is formed in the middle portion in the inner and outer directions, the inclined slits cross the thickness direction of the sheet-shaped base material and the sheet-shaped base material moves in the inner and outer directions. Conventional products 2 and 3 which are formed into a plurality of sheet-like substrates in the inward and outward directions by forming grooves or gaps at right angles to the surface of the substrate even if the substrate is divided into a plurality of pieces
In comparison with the above, there is no reduction in the strength of the joint portion of the divided sheet-shaped base material, and it is possible to secure uniform strength over the entire gasket. Further, since it is sufficient to prepare one kind of sheet-like base material (material sheet) having a predetermined width in the inward and outward directions and form an inclined slit in the middle part thereof, it is necessary to separately prepare two kinds of material sheets. Compared to a certain conventional product 3,
Products with reduced material and processing costs (sheet gaskets)
The cost can be significantly reduced. Nevertheless, the internal structure of the sheet-shaped substrate is formed by absorbing the dimensional changes in the inner and outer diameter directions during pressure molding with the slip of the inclined surface and applying a large pressure to the inclined surface to reliably form a high-density layer. It is possible to significantly reduce the occurrence of permeation leakage through the layers to the outside and improve the sealing performance of the entire gasket.
【0014】特に、前記横断スリットの断面形状を>形
または略X形とする場合は、内外方向に分割されたシー
ト状基材の内外端部分同士を互いに嵌合状態に保持して
加圧成形することが可能で、内外の分割シート状基材の
位置ずれがなく、両者を確実に一体化してガスケット本
来のシール性能を一層高めることができる。In particular, when the cross-sectional shape of the transverse slit is> shaped or substantially X-shaped, the inner and outer end portions of the sheet-shaped substrate divided in the inner and outer directions are held in a fitted state with each other and pressure-molded. Therefore, there is no positional deviation between the inner and outer divided sheet-shaped substrates, and the two can be reliably integrated to further enhance the original sealing performance of the gasket.
【0015】また、高密度層に油や樹脂等の不浸透性物
質を充填させる場合は、その高密度層内の微少な隙間も
不浸透性物質で塞いで流体の微少漏れも確実に防止する
ことができる。Further, when the high-density layer is filled with an impermeable substance such as oil or resin, the minute gaps in the high-density layer are also covered with the impermeable substance to surely prevent the minute leakage of fluid. be able to.
【0016】[0016]
【発明の実施の形態】以下、本発明の実施形態を図面に
もとづいて説明する。図1は本発明の第1実施例による
シートガスケットの加圧成形前の平面図、図2は図1の
A−A線に沿った断面構造を示す要部の拡大斜視図であ
る。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a sheet gasket according to a first embodiment of the present invention before pressure molding, and FIG. 2 is an enlarged perspective view of an essential part showing a sectional structure taken along line AA of FIG.
【0017】当該シートガスケット5は、例えば膨張黒
鉛や多孔質PTFEなどにような層状の内部構造を有す
る材料を加圧して円環形状に形成された一種類のシート
状基材1の内外方向の中間部分に、図2に明示するよう
に、断面形状が>形のスリット2を該シート状基材1の
厚み方向を横断させて全周に亘って形成することによ
り、円環形状のシート状基材1を内外方向で二つのシー
ト状基材部1A,1Bに分割し、この二つの分割シート
状基材部1A,1Bをそれらの外周端部分1aと内周端
部分1bが相互に嵌合され、>形の傾斜端面1a1,1
b1同士が互いに密接された状態でその全体がほぼ一様
な肉厚になるように加圧成形することによって両分割シ
ート状基材部1A,1Bを一体化して構成されている。The sheet gasket 5 is formed by pressurizing a material having a layered internal structure, such as expanded graphite or porous PTFE, in the inner and outer directions of one kind of sheet-shaped base material 1 formed in a ring shape. As shown in FIG. 2, in the intermediate portion, a slit 2 having a cross section >> is formed over the entire circumference across the thickness direction of the sheet-shaped base material 1 to form an annular sheet-like shape. The base material 1 is divided into two sheet-shaped base material portions 1A and 1B in the inner and outer directions, and the two divided sheet-shaped base material portions 1A and 1B are fitted to each other by their outer peripheral end portion 1a and inner peripheral end portion 1b. Are joined together, and the > -shaped inclined end faces 1a1,1
The divided sheet-shaped base materials 1A and 1B are integrally formed by pressure-molding b1 in close contact with each other so that the whole has a substantially uniform thickness.
【0018】この第1実施例によるシートガスケット5
は、円環形状に形成された一種類のシート状基材1を用
いて、その内外方向の中間部分にスリット2を形成した
後、加圧成形することで製作可能であり、材料費及び加
工費を低減して製品(シートガスケット)の著しいコス
トダウンが図れる。そして、加圧成形後は、図3に明示
するように、両分割シート状基材部1A,1Bの表裏両
面部の内外方向全域に亘って高密度で高配向の気密層3
A,3Bが形成されているとともに、シート状基材1の
内外方向の中間部分には該シート状基材1の表裏面に対
して断面形状>形に傾斜した高密度、高配向の高気密層
4が形成されている。The sheet gasket 5 according to the first embodiment.
Can be manufactured by using one kind of sheet-shaped base material 1 formed in an annular shape, forming a slit 2 at an intermediate portion in the inner and outer directions thereof, and then press-molding the material. The cost can be reduced and the cost of the product (sheet gasket) can be significantly reduced. Then, after the pressure molding, as clearly shown in FIG. 3, the airtight layer 3 having a high density and a high orientation over the entire inner and outer directions of the front and back both surface portions of the divided sheet-shaped base material portions 1A and 1B.
A and 3B are formed, and the sheet-like base material 1 has an intermediate portion in the inner and outer directions in which the sheet-like base material 1 has a high density and high orientation with a cross-sectional shape> inclined with respect to the front and back surfaces of the sheet-like base material 1 and high airtightness. Layer 4 has been formed.
【0019】したがって、例えば配管の継手フランジ面
に介在させ、ボルト等を介して高面圧に締付けて使用す
ることにより、シート状基材1(1A,1B)の高密
度、高配向の気密層3A,3Bが継手フランジ面に密接
されて接面漏れが防止される一方、シート状基材1の層
状内部構造を経て径外方に至る浸透漏れが内外方向の中
間部分に形成された高密度、高配向の高気密層4で遮断
される。また、この断面形状が>形の高気密層4で遮断
された流体は該高気密層4に沿ってシート状基材1の表
面あるいは裏面側に誘導されて接面漏れの状態となる
が、この部分には既述のように気密層3A,3Bが存在
するので、浸透漏れから変化して接面漏れが発生するこ
ともなくなり、シートガスケット5全体としての非常に
高いシール性能を発揮することができる。Therefore, for example, by interposing it on the joint flange surface of the pipe and tightening it to a high surface pressure via a bolt or the like, the sheet-like base material 1 (1A, 1B) is densely and highly oriented in an airtight layer. While 3A and 3B are in close contact with the joint flange surface to prevent surface leakage, permeation leakage to the radial outside through the layered internal structure of the sheet-shaped base material 1 is formed at the intermediate portion in the inward and outward directions with high density. , The highly airtight layer 4 having a high orientation is blocked. Further, the fluid blocked by the highly airtight layer 4 having a cross section of> -shape is guided to the front surface or the back surface side of the sheet-shaped substrate 1 along the highly airtight layer 4 to be in a leaking state on the contact surface, As described above, since the airtight layers 3A and 3B are present in this portion, it is possible to prevent the contact surface leak from occurring due to the change from the permeation leak, and to exert a very high sealing performance of the sheet gasket 5 as a whole. You can
【0020】なお、上記第1実施例では、断面形状>形
のスリット2及び高気密層4を、その頂点Xがシート状
基材1の厚み方向の中央部C上に位置するように形成し
たもので示したが、図4あるいは図5に示すように、>
形のスリット2及び高気密層4の頂点Xをシート状基材
1の厚み方向の表面側あるいは裏面側の一方に偏るよう
に形成してもよい。また、スリット2のシート状基材1
の表面に対する傾斜角度θは30〜50°位に設定する
ことが望ましい。傾斜角度θが30°未満の場合はスリ
ット加工が困難であり、50°を越える場合は加圧成形
時にスリット2の対向面が密着せず、互いの結合力が弱
くて分離しやすい。In the first embodiment described above, the slit 2 and the highly airtight layer 4 having a cross-sectional shape> is formed so that the apex X thereof is located on the central portion C in the thickness direction of the sheet-shaped substrate 1. However, as shown in FIG. 4 or 5,
The slits 2 and the apex X of the highly airtight layer 4 may be formed so as to be biased to one of the front surface side and the back surface side in the thickness direction of the sheet-shaped substrate 1. In addition, the sheet-shaped substrate 1 of the slit 2
The inclination angle θ with respect to the surface of is preferably set to about 30 to 50 °. If the inclination angle θ is less than 30 °, slit processing is difficult, and if it exceeds 50 °, the opposing surfaces of the slits 2 do not come into close contact during pressure molding, and the bonding force between them is weak and they are easily separated.
【0021】図6は本発明の第2実施例によるシートガ
スケットの要部の拡大縦断斜視図である。この第2実施
例によるシートガスケット5では、シート状基材1の内
外方向の中間部分に該シート状基材1の厚み方向を横断
させて全周に亘って形成されるスリット2の断面形状が
略X形に形成されている点で第1実施例と相違し、その
他の構成は第1実施例と同様であるため、該当部分に同
一の符号を付して、それらの詳しい説明は省略する。FIG. 6 is an enlarged vertical perspective view of a main part of a sheet gasket according to the second embodiment of the present invention. In the sheet gasket 5 according to the second embodiment, the cross-sectional shape of the slit 2 formed at the intermediate portion of the sheet-shaped base material 1 in the inner and outer directions across the entire circumference across the thickness direction of the sheet-shaped base material 1. The structure is different from that of the first embodiment in that it is formed in a substantially X shape, and the other structures are the same as those of the first embodiment. Therefore, corresponding parts are denoted by the same reference numerals and detailed description thereof will be omitted. .
【0022】この第2実施例によるシートガスケット5
も、第1実施例によるシートガスケットと同様に、円環
形状に形成された一種類のシート状基材1を用いて、そ
の内外方向の中間部分に略X形のスリット2を形成した
後、加圧成形することで製作可能であり、材料費及び加
工費を低減して製品(シートガスケット)の著しいコス
トダウンが図れる。そして、加圧成形によって両分割シ
ート状基材1A,1Bの表裏両面部の内外方向全域に亘
って高密度で高配向の気密層3A,3Bが形成されると
ともに、シート状基材1の内外方向の中間部分には断面
形状が略X形の横断スリット2に沿う状態で、略X形の
高密度、高配向の高気密層4が形成されており、第1実
施例に比べて浸透漏れ防止性能に優れているだけでな
く、浸透してきた流体がシート状基材1の表面あるいは
裏面側に誘導されて接面漏れに変換されることも抑制す
ることが可能で、シートガスケット5全体としてのシー
ル性能を一層高めることができる。Sheet gasket 5 according to the second embodiment
Also, similarly to the sheet gasket according to the first embodiment, after using one kind of sheet-shaped base material 1 formed in an annular shape and forming a substantially X-shaped slit 2 in an intermediate portion in the inner and outer directions thereof, It can be manufactured by pressure molding, and the material cost and the processing cost can be reduced to significantly reduce the cost of the product (sheet gasket). Then, by pressure molding, high density and highly oriented airtight layers 3A and 3B are formed over the entire front and back both sides of the divided sheet-shaped substrates 1A and 1B, and the inside and outside of the sheet-shaped substrate 1 are formed. In the middle portion of the direction, a substantially X-shaped high-density, highly-oriented and highly airtight layer 4 is formed in a state where the cross-sectional shape is along the transverse slit 2 having a substantially X-shape. Not only is it excellent in prevention performance, but it is also possible to suppress the permeated fluid from being guided to the front surface or the back surface side of the sheet-shaped substrate 1 and being converted into contact surface leakage, and the sheet gasket 5 as a whole. The sealing performance of can be further improved.
【0023】図7は本発明の第3実施例によるシートガ
スケットの要部の拡大縦断面図である。この第3実施例
によるシートガスケット5では、シート状基材1の内外
方向の中間部分に該シート状基材1の表面に対して傾斜
した直線状のスリット2をシート基材1の厚み方向を横
断させて形成されている点で第1実施例と相違し、その
他の構成は第1実施例と同様であるため、該当部分に同
一の符号を付して、それらの詳しい説明は省略する。FIG. 7 is an enlarged vertical sectional view of the main part of the sheet gasket according to the third embodiment of the present invention. In the sheet gasket 5 according to the third embodiment, a linear slit 2 inclined with respect to the surface of the sheet-shaped base material 1 is formed in the middle portion of the sheet-shaped base material 1 in the inner and outer directions in the thickness direction of the sheet base material 1. The third embodiment is different from the first embodiment in that it is formed so as to be crossed, and other configurations are the same as those in the first embodiment. Therefore, corresponding portions are denoted by the same reference numerals and detailed description thereof will be omitted.
【0024】この第3実施例によるシートガスケット5
も、第1及び第2実施例によるシートガスケットと同様
に、一種類のシート状基材1を用いて、その内外方向の
中間部分に略X形のスリット2を形成した後、加圧成形
することで製作可能であり、材料費及び加工費を低減し
て製品(シートガスケット)の著しいコストダウンが図
れるとともに、内外方向の中間部分には直線状に傾斜し
た高密度、高配向の高気密層4が形成されることから、
十分な浸透漏れ防止性能を発揮させることが可能であ
る。Sheet gasket 5 according to the third embodiment
Also, similarly to the sheet gaskets according to the first and second embodiments, one kind of sheet-shaped base material 1 is used, and a substantially X-shaped slit 2 is formed in an intermediate portion in the inner and outer directions thereof, and then pressure molding is performed. It is possible to manufacture it, and it is possible to reduce the material cost and the processing cost to significantly reduce the cost of the product (sheet gasket), and the high density and highly oriented airtight layer which is linearly inclined in the middle part of the inner and outer directions. Since 4 is formed,
It is possible to exert sufficient penetration leakage prevention performance.
【0025】図8は本発明の第4実施例によるシートガ
スケットの要部の拡大縦断面図であり、この第4実施例
によるシートガスケット5では、シート状基材1の内外
方向の中間部分に、該シート状基材1の厚み方向を横断
しないで基材1の一部が繋がったまま残る断面略ハ字形
状のスリット2を形成した点で第1実施例と相違し、そ
の他の構成は第1実施例と同様であるため、該当部分に
同一の符号を付して、それらの詳しい説明は省略する。FIG. 8 is an enlarged vertical cross-sectional view of an essential part of a sheet gasket according to the fourth embodiment of the present invention. In the sheet gasket 5 according to the fourth embodiment, the sheet gasket 5 is provided at the intermediate portion in the inner and outer directions of the sheet-shaped substrate 1. Different from the first embodiment in that a slit 2 having a substantially V-shaped cross section is formed so that a part of the base material 1 remains connected without crossing the thickness direction of the sheet-like base material 1, and other configurations are the same. Since it is the same as that of the first embodiment, the same reference numerals are given to corresponding portions, and detailed description thereof will be omitted.
【0026】この第4実施例によるシートガスケット5
の場合は、断面略ハ字形状のスリット2部分を含めて全
体を肉厚が一様になるように加圧成形することにより、
内外方向の中間部分にシートガスケット5の厚み方向に
連続して横断する断面形状が略>形の高気密層が形成さ
れることになり、第1実施例の場合とほぼ同等な浸透漏
れ防止性能を発揮させることが可能である。Sheet gasket 5 according to the fourth embodiment
In the case of, by pressure-molding the entire body including the slit 2 portion having a substantially C-shaped cross section so that the thickness becomes uniform,
A highly airtight layer having a cross section of substantially> shape crossing continuously in the thickness direction of the sheet gasket 5 is formed in the middle portion in the inner / outer direction, and the permeation leakage prevention performance is almost the same as that of the first embodiment. It is possible to demonstrate.
【0027】上述した本発明の第1〜第4実施例のシー
トガスケットのいずれも、一種類のシート状基材1を作
製し、その中間部に傾斜スリット2を形成した上、加圧
成形すればよく、二種類の素材シートを各別に作製準備
する必要がある従来品3に比べて、材料費及び加工費を
低減して製品(シートガスケット)の著しいコストダウ
ンが図れ、また、シート状基材表面に対して直角な溝や
隙間を形成して内外方向で複数個のシート状基材に分割
する従来品2や3に比べて、分割シート状基材1A,1
Bの継ぎ部分の強度低下がなく、ガスケット5全体に亘
って均一な強度を確保することが可能である。それでい
て、加圧成形時の内外径方向への寸法変化が傾斜面のす
べりで吸収されるとともに、傾斜面に大きな加圧力を付
与して高密度層4が確実に形成されるので、シート状基
材1の内部構造層を経て外部に至る浸透漏れの発生を著
しく減少し、ガスケット5全体のシール性能を高めるこ
とができる。In each of the above-described sheet gaskets of the first to fourth embodiments of the present invention, one kind of sheet-like base material 1 is produced, an inclined slit 2 is formed in the middle portion thereof, and pressure molding is performed. Compared with the conventional product 3, which requires separate preparation of two types of material sheets, the material cost and processing cost can be reduced, and the product (sheet gasket) can be significantly reduced in cost. Compared with the conventional products 2 and 3 in which grooves or gaps perpendicular to the material surface are formed to divide into a plurality of sheet-like base materials in the inward and outward directions, divided sheet-like base materials 1A, 1
It is possible to secure uniform strength over the entire gasket 5 without lowering the strength of the joint portion of B. Moreover, since the dimensional changes in the inner and outer diametrical directions at the time of pressure molding are absorbed by the slip of the inclined surface, a large pressing force is applied to the inclined surface to reliably form the high-density layer 4. It is possible to significantly reduce the occurrence of permeation leakage to the outside through the internal structural layer of the material 1, and to improve the sealing performance of the entire gasket 5.
【0028】因みに、本発明者らは、本発明の実施例の
うち、第1実施例及び第2実施例のシートガスケット並
びに従来品1,2,4のシートガスケットそれぞれにつ
いての漏れ量及び加圧時の分割シート状基材部1A,1
Bのずれの有無を確認する実験を行ない、表1に示すよ
うな結果を得た。By the way, the inventors of the present invention, among the embodiments of the present invention, the sheet gaskets of the first and second embodiments and the sheet gaskets of the conventional products 1, 2 and 4, respectively, the leakage amount and the pressurization. Divided sheet-shaped base materials 1A, 1
An experiment for confirming the presence or absence of deviation of B was conducted, and the results shown in Table 1 were obtained.
【0029】[0029]
【表1】 [Table 1]
【0030】表1に示す実験結果からも明らかなよう
に、本発明の実施例品は、従来品4に比べて材料費及び
加工費の低減により製品のコストダウンを図ることが可
能であり、また、従来品1,2に比べて漏れ量の減少を
図ることが可能であり、さらに、従来品2に比べて加圧
成形時のずれがなくて全体のシール性能の著しい向上が
図り得ることが確認できた。As is clear from the experimental results shown in Table 1, the product of the embodiment of the present invention can reduce the cost of the product by reducing the material cost and the processing cost as compared with the conventional product 4. In addition, it is possible to reduce the amount of leakage as compared with the conventional products 1 and 2, and further, as compared with the conventional product 2, there is no deviation at the time of pressure molding, and the overall sealing performance can be significantly improved. Was confirmed.
【0031】なお、上記実施例では、円環状形のシート
ガスケットについて説明したが、四角環状形であっても
よい。また、シート状基材の材料として、上記実施例で
は、膨張黒鉛や多孔質PTFEを用いたが、これ以外
に、ビータシート、ジョイントシートまたは抄造ペーパ
ーような層状の内部構造を有する材料であればよい。In the above embodiment, the sheet gasket having an annular shape has been described, but it may have a square annular shape. Further, as the material of the sheet-shaped base material, expanded graphite or porous PTFE was used in the above-mentioned examples, but other than this, any material having a layered internal structure such as beater sheet, joint sheet or papermaking paper may be used. Good.
【0032】さらに、シートガスケットにおける高気密
層に、例えば油や樹脂等の不浸透性物質を充填すること
により、高密度層内の微少な隙間も不浸透性物質で塞い
で流体の微少漏れも確実に防止し、シートガスケット全
体のシール性能を一層高めることができる。Furthermore, by filling the highly airtight layer of the sheet gasket with an impermeable substance such as oil or resin, even minute gaps in the high-density layer are closed with the impermeable substance, and even a slight leakage of fluid occurs. It is possible to surely prevent and further improve the sealing performance of the entire sheet gasket.
【0033】[0033]
【発明の効果】以上のように、本発明によれば、二種類
の素材シートを各別に作製準備する必要がなく、内外方
向に所定幅を有する一種類のシート状基材(素材シー
ト)を作製し、その内外方向の中間部に傾斜スリットを
形成した上で肉厚を揃えるために加圧成形すればよいの
で、材料費及び加工費の低減により製品のコストダウン
を図ることができるとともに、スリットがシート状基材
の厚み方向を横断してシート状基材が内外方向で複数個
に分割されるような形態のものであっても、シート状基
材表面に対して直角な溝や隙間を形成して内外方向で複
数個のシート状基材に分割する従来品に比べて、分割シ
ート状基材の継ぎ部分の強度低下がなく、ガスケット全
体に亘って均一な強度を確保することができる。それで
いて、内外方向の中間部分には基材表面に対して傾斜す
るスリットが形成されているので、加圧成形時の内外径
方向への寸法変化を傾斜面のすべりで吸収するととも
に、傾斜面に大きな加圧力を付与して高密度層を確実に
形成してシート状基材の内部構造層を経て外部に至る浸
透漏れの発生を著しく減少し、ガスケット全体としての
シール性能を十分に確保することができるという効果を
奏する。As described above, according to the present invention, it is not necessary to separately prepare two kinds of material sheets, and one kind of sheet-like base material (material sheet) having a predetermined width in the inner and outer directions is used. Since it may be produced, pressure molding may be performed to form a slanted slit in the middle portion in the inner and outer directions thereof and then the wall thickness is made uniform, so that it is possible to reduce the cost of the product by reducing the material cost and the processing cost, Even if the slit has a shape such that it crosses the thickness direction of the sheet-shaped substrate and the sheet-shaped substrate is divided into a plurality of pieces in the inner and outer directions, grooves and gaps perpendicular to the surface of the sheet-shaped substrate are formed. Compared with the conventional product in which a sheet is formed and divided into a plurality of sheet-shaped substrates in the inward and outward directions, the strength of the joint portion of the divided sheet-shaped substrates does not decrease, and uniform strength can be secured over the entire gasket. it can. Still, since a slit that is inclined with respect to the surface of the base material is formed in the intermediate portion in the inner and outer directions, the dimensional change in the inner and outer radial directions during pressure molding is absorbed by the slip of the inclined surface, and Applying a large pressure force to form a high-density layer surely to significantly reduce the occurrence of permeation leakage to the outside through the internal structural layer of the sheet-like base material, and sufficiently secure the sealing performance of the gasket as a whole. There is an effect that can be.
【0034】特に、厚み方向を横断して形成されるスリ
ットの断面形状を>形または略X形とする場合は、内外
方向に分割されたシート状基材の内外端部分同士を互い
に嵌合状態に保持して加圧成形することが可能で、内外
の分割シート状基材の位置ずれがなく、両者を確実に一
体化してガスケット本来のシール性能を一層高めること
ができる。In particular, when the cross-sectional shape of the slit formed across the thickness direction is a> shape or a substantially X shape, the inner and outer end portions of the sheet-like base material divided in the inner and outer directions are fitted to each other. It is possible to carry out pressure molding while holding the above, and there is no positional deviation between the inner and outer divided sheet base materials, and the two can be reliably integrated to further enhance the gasket's original sealing performance.
【図1】本発明の第1実施例によるシートガスケットの
加圧成形前の平面図である。FIG. 1 is a plan view of a sheet gasket according to a first embodiment of the present invention before pressure molding.
【図2】図2は図1のA−A線に沿った断面構造を示す
要部の拡大斜視図である。FIG. 2 is an enlarged perspective view of an essential part showing a sectional structure taken along line AA of FIG.
【図3】加圧成形後の要部の拡大縦断面図である。FIG. 3 is an enlarged vertical cross-sectional view of a main part after pressure molding.
【図4】第1実施例の変形断面構造の一つを示す要部の
拡大斜視図である。FIG. 4 is an enlarged perspective view of an essential part showing one of the modified cross-sectional structures of the first embodiment.
【図5】第1実施例の変形断面構造の他の一つを示す要
部の拡大斜視図である。FIG. 5 is an enlarged perspective view of a main part showing another one of the modified cross-sectional structures of the first embodiment.
【図6】本発明の第2実施例によるシートガスケットの
断面構造を示す要部の拡大斜視図である。FIG. 6 is an enlarged perspective view of an essential part showing a sectional structure of a sheet gasket according to a second embodiment of the present invention.
【図7】本発明の第3実施例によるシートガスケットの
要部の拡大縦断面図である。FIG. 7 is an enlarged vertical sectional view of a main part of a sheet gasket according to a third embodiment of the present invention.
【図8】本発明の第4実施例によるシートガスケットの
要部の拡大縦断面図である。FIG. 8 is an enlarged vertical sectional view of a main part of a sheet gasket according to a fourth embodiment of the present invention.
【図9】従来品3のシートガスケットの加圧成形前の断
面構造を示す要部の拡大斜視図である。FIG. 9 is an enlarged perspective view of an essential part showing a cross-sectional structure of a sheet gasket of Conventional product 3 before pressure molding.
【図10】従来品4のシートガスケットの加圧成形前の
断面構造を示す要部の拡大斜視図である。FIG. 10 is an enlarged perspective view of an essential part showing a sectional structure of a sheet gasket of Conventional product 4 before pressure molding.
【図11】従来品4のシートガスケットの加圧成形後の
断面構造を示す要部の拡大縦断面図である。FIG. 11 is an enlarged vertical cross-sectional view of a main part showing a cross-sectional structure of a sheet gasket of Conventional product 4 after pressure molding.
1 シート状基材 1A,1B 分割シート状基材部 2 スリット 3A,3B,4 高気密層 5 シートガスケツト 1 Sheet-shaped substrate 1A, 1B split sheet base material 2 slits 3A, 3B, 4 Highly airtight layer 5 sheet gasket
───────────────────────────────────────────────────── フロントページの続き (72)発明者 前田 桐志 兵庫県三田市下内神字打場541番地の1 日本ピラー工業株式会社三田工場内 Fターム(参考) 3J040 BA01 EA15 FA07 FA11 HA02 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Kirishi Maeda 1 of 541, Shimouchi Kamibata, Sanda City, Hyogo Prefecture Japan Pillar Industry Co., Ltd. Mita factory F term (reference) 3J040 BA01 EA15 FA07 FA11 HA02
Claims (6)
に形成されるシート状基材の内外方向の中間部分に、該
シート状基材の表面に対して傾斜したスリットを形成
し、この傾斜スリット部分を含めてシート状基材全体を
ほぼ一様な肉厚になるように加圧成形して前記中間部分
に高気密層を形成していることを特徴とするシートガス
ケット。1. A slit inclined with respect to the surface of the sheet-shaped substrate is formed at an intermediate portion in the inner and outer directions of a sheet-shaped substrate formed of a material having a layered internal structure in an annular shape. A sheet gasket comprising a sheet-like base material including a slit portion, which is pressure-molded to have a substantially uniform thickness to form a highly airtight layer in the intermediate portion.
向を横断して形成されており、この横断スリットにより
分割された内外方向で複数個の分割シート状基材の傾斜
面同士を互いに密接させて加圧成形することにより、分
割シート状基材が高気密層を介して一体化されている請
求項1に記載のシートガスケット。2. The slit is formed so as to cross the thickness direction of the sheet-shaped base material, and the inclined surfaces of the plurality of divided sheet-shaped base materials are closely contacted with each other in the inner and outer directions divided by the transverse slit. The sheet gasket according to claim 1, wherein the divided sheet-shaped substrates are integrated with each other by interposing a highly airtight layer by performing the pressure molding.
スリットが、断面形状>形または略X形に形成されてい
る請求項2に記載のシートガスケット。3. The sheet gasket according to claim 2, wherein the slit crossing the thickness direction of the sheet-shaped base material is formed in a cross-sectional shape> shape or substantially X shape.
度のうちの少なくとも一方を高めることで形成されてい
る請求項1ないし3のいずれかに記載のシートガスケッ
ト。4. The sheet gasket according to claim 1, wherein the highly airtight layer is formed by increasing at least one of an orientation state and a density of a material.
張黒鉛、多孔質ポリテトラフロロエチレン、ビータシー
ト、ジョイントシートまたは抄造ペーパーのうちから選
択されたものである請求項1ないし4のいずれかに記載
のシートガスケット。5. The material for forming the sheet-shaped base material is selected from expanded graphite, porous polytetrafluoroethylene, beater sheet, joint sheet or papermaking paper. The sheet gasket described in Crab.
されている請求項1ないし5のいずれかに記載のシート
ガスケット。6. The sheet gasket according to claim 1, wherein the highly airtight layer is filled with an impermeable substance.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002128283A JP3899286B2 (en) | 2002-04-30 | 2002-04-30 | Sheet gasket |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002128283A JP3899286B2 (en) | 2002-04-30 | 2002-04-30 | Sheet gasket |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2003322258A true JP2003322258A (en) | 2003-11-14 |
JP3899286B2 JP3899286B2 (en) | 2007-03-28 |
Family
ID=29542089
Family Applications (1)
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JP2002128283A Expired - Fee Related JP3899286B2 (en) | 2002-04-30 | 2002-04-30 | Sheet gasket |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009505030A (en) * | 2005-08-22 | 2009-02-05 | ゴア エンタープライズ ホールディングス,インコーポレイティド | EPTFE gasket material with low sealing stress |
GB2455346B (en) * | 2007-12-07 | 2010-05-26 | Rolls Royce Plc | Multi-layer gasket or seal member |
-
2002
- 2002-04-30 JP JP2002128283A patent/JP3899286B2/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009505030A (en) * | 2005-08-22 | 2009-02-05 | ゴア エンタープライズ ホールディングス,インコーポレイティド | EPTFE gasket material with low sealing stress |
GB2455346B (en) * | 2007-12-07 | 2010-05-26 | Rolls Royce Plc | Multi-layer gasket or seal member |
US7845647B2 (en) | 2007-12-07 | 2010-12-07 | Rolls-Royce Plc | Multi-layer gasket or seal member |
Also Published As
Publication number | Publication date |
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JP3899286B2 (en) | 2007-03-28 |
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