JP2009008238A - Sealing device - Google Patents

Sealing device Download PDF

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JP2009008238A
JP2009008238A JP2007172605A JP2007172605A JP2009008238A JP 2009008238 A JP2009008238 A JP 2009008238A JP 2007172605 A JP2007172605 A JP 2007172605A JP 2007172605 A JP2007172605 A JP 2007172605A JP 2009008238 A JP2009008238 A JP 2009008238A
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peripheral
packing
backup ring
groove
pressure
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JP4873173B2 (en
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Masaya Otsuka
雅也 大塚
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Nok Corp
Nok株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent a packing from breaking by projecting a part of the packing at a low-pressure side in a sealing device wherein a back-up ring is arranged at the low-pressure side of the packing. <P>SOLUTION: The packing and the back-up ring 4 located at the low-pressure side rather than the packing and made of a material with rigidity higher than that of the packing are mounted in a mounting groove formed on an outer peripheral surface of an inner peripheral member 2 and continued in the circumferential direction. In the back-up ring 4, a width La in the radial direction of one side 4a facing to a packing side is greater than a height h from a groove bottom face 21c to the counter member, and one side 4a and the other side 4b is inclined in the same direction of an inside face 21b at the low-pressure side of the mounting groove at the time of a mounted state of the back-up ring 4. An angle θ<SB>1</SB>made between an inner peripheral surface 4c relatively shifted to an opposite side of the packing due to this inclination and the groove bottom face 21c brought into contact with the inner peripheral surface 4c is greater than an inclined angle θ<SB>2</SB>of the other side 4b against the inside face 21b at the low-pressure side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、燃料電池用高圧ガス供給装置や、産業機器の油圧装置等、高圧を発生する機器の回転部分又は往復動部分を、パッキングにより密封する密封装置であって、特に、バックアップリングを備えるものに関する。   The present invention is a sealing device that seals a rotating part or a reciprocating part of a device that generates high pressure, such as a high-pressure gas supply device for a fuel cell or a hydraulic device for industrial equipment, by packing, and particularly includes a backup ring. About things.

機器の外周部材(例えばハウジング)と内周部材(例えばピストン)との間の密封手段として、従来から、Oリング等のようなパッキングが好適に用いられる。図13は、このようなパッキングのみによる従来の密封装置を、軸心Oを通る平面で切断して示す片側断面図で、図中の参照符号101は外周部材、102はこの外周部材101の内周に配置された内周部材である。内周部材102の外周面には、円周方向へ連続した矩形断面の装着溝103が形成されており、この装着溝103にはパッキング104が装着されている。   Conventionally, a packing such as an O-ring is suitably used as a sealing means between an outer peripheral member (for example, a housing) and an inner peripheral member (for example, a piston) of an apparatus. FIG. 13 is a one-side cross-sectional view showing a conventional sealing device using only such packing, cut along a plane passing through the axis O, where reference numeral 101 denotes an outer peripheral member, and 102 denotes an inner member of the outer peripheral member 101. It is the inner peripheral member arrange | positioned at the periphery. A mounting groove 103 having a rectangular cross section continuous in the circumferential direction is formed on the outer peripheral surface of the inner peripheral member 102, and a packing 104 is mounted in the mounting groove 103.

パッキング104は、ゴム状弾性材料で断面円形の環状に成形された、いわゆるOリングであって、装着溝103の溝底面と、外周部材101の内周面101aとの間に適宜圧縮された状態で介在され、密封対象流体が外周部材101と内周部材102の間の隙間から外部へ漏洩するのを防止するものである。しかしながら、著しく高圧のガスを密封対象とするような場合は、装着溝103内に達する高圧ガスの圧力Pによって、外周部材101の内周面101aと低圧側の溝肩103aとの間の隙間G1へパッキング104の一部がはみ出して破損するおそれがある。   The packing 104 is a so-called O-ring formed of a rubber-like elastic material in a circular shape with a circular cross section, and is appropriately compressed between the groove bottom surface of the mounting groove 103 and the inner peripheral surface 101 a of the outer peripheral member 101. The fluid to be sealed is prevented from leaking from the gap between the outer peripheral member 101 and the inner peripheral member 102 to the outside. However, when extremely high pressure gas is to be sealed, the gap G1 between the inner peripheral surface 101a of the outer peripheral member 101 and the low pressure side groove shoulder 103a is caused by the pressure P of the high pressure gas reaching the mounting groove 103. There is a risk that a part of the packing 104 protrudes and is damaged.

図14は、高圧条件でのこのようなパッキング104のはみ出しによる破損を防止するために、パッキング104とバックアップリング105を併用した従来の密封装置を、軸心Oを通る平面で切断して示す片側断面図である。すなわち、図14に示される密封装置は、装着溝103内に、パッキング104と、それより低圧側に位置し、パッキング104より剛性の高い例えば合成樹脂材料からなるバックアップリング105が装着され、このバックアップリング105によって、外周部材101の内周面101aと低圧側の溝肩103aとの隙間G1へのパッキング104のはみ出し防止を図るものである。   FIG. 14 shows one side of a conventional sealing device using a packing 104 and a backup ring 105 cut along a plane passing through an axis O in order to prevent such damage due to protrusion of the packing 104 under high pressure conditions. It is sectional drawing. That is, the sealing device shown in FIG. 14 is provided with a packing 104 and a backup ring 105 made of, for example, a synthetic resin material having a higher rigidity than the packing 104 in the mounting groove 103. The ring 105 prevents the packing 104 from protruding into the gap G1 between the inner peripheral surface 101a of the outer peripheral member 101 and the groove shoulder 103a on the low pressure side.

しかしながら、寸法公差を考慮して、バックアップリング105の径方向寸法Lは、外周部材101の内周面101aと装着溝103の溝底面との間の高さhよりも低く設定されており、このため、バックアップリング105と装着溝103との間に隙間G2を生じて、結局、この隙間G2にパッキング104のはみ出しが起こるおそれがあった。   However, in consideration of dimensional tolerances, the radial dimension L of the backup ring 105 is set lower than the height h between the inner peripheral surface 101a of the outer peripheral member 101 and the groove bottom surface of the mounting groove 103. Therefore, there is a possibility that a gap G2 is generated between the backup ring 105 and the mounting groove 103, and eventually the packing 104 protrudes from the gap G2.

そこで、装着溝103及び(又は)バックアップリング105の断面形状を工夫することによって、パッキング104のはみ出し防止を図った密封装置が提案されている。図15及び図16は、このような従来の密封装置を、軸心Oを通る平面で切断して示す片側断面図、図17は、図16の密封装置が高圧を受けた状態を、軸心Oを通る平面で切断して示す片側断面図である。   Therefore, a sealing device has been proposed in which the cross-sectional shape of the mounting groove 103 and / or the backup ring 105 is devised to prevent the packing 104 from protruding. FIGS. 15 and 16 are side sectional views showing such a conventional sealing device cut along a plane passing through the axis O, and FIG. 17 shows a state where the sealing device of FIG. It is the one side sectional view cut and shown by the plane which passes O.

このうち、図15に示される密封装置は、パッキング104より低圧側の溝底面103bを、低圧側へ向けて浅くなる円錐面状に形成し、これに接するバックアップリング105の周面105aを、溝底面103bと対応する円錐面状に形成したものである。この構成によれば、パッキング104が、装着溝103内へ達する高圧ガスの圧力Pを受けると、このパッキング104を介して低圧側へ押されるバックアップリング105が、円錐面状の溝底面103bと外周部材101の内周面101aとの間へクサビのように介入して行くので、パッキング104のはみ出しを許容する隙間が形成されることはない(例えば下記の特許文献1又は特許文献2参照)。   Among these, the sealing device shown in FIG. 15 has a groove bottom surface 103b on the low pressure side from the packing 104 formed in a conical surface shape that becomes shallower toward the low pressure side, and a peripheral surface 105a of the backup ring 105 in contact with the groove bottom surface 103a. It is formed in a conical shape corresponding to the bottom surface 103b. According to this configuration, when the packing 104 receives the pressure P of the high-pressure gas reaching into the mounting groove 103, the backup ring 105 pushed to the low-pressure side through the packing 104 has the conical groove bottom surface 103b and the outer periphery. Since the wedge 101 intervenes between the inner peripheral surface 101a of the member 101, a gap allowing the protrusion of the packing 104 is not formed (see, for example, Patent Document 1 or Patent Document 2 below).

しかしながら、図15の密封装置によれば、内周部材102(又は外周部材101)の装着溝103の溝底面の一部を円錐面状に形成するための加工が必要となり、加工コストの上昇を来す問題があった。   However, according to the sealing device of FIG. 15, it is necessary to perform a process for forming a part of the groove bottom surface of the mounting groove 103 of the inner peripheral member 102 (or the outer peripheral member 101) into a conical surface, which increases the processing cost. There was a problem to come.

一方、図16に示される密封装置は、バックアップリング105を、軸心Oを通る平面で切断した断面形状を平行四辺形とし、軸心Oと直交する平面に対して傾斜した状態で装着溝103内へ装着したものである。この構成によれば、図17に示されるように、パッキング104が、装着溝103内へ達する高圧ガスの圧力Pを受けると、このパッキング104を介して低圧側へ押されるバックアップリング105が、装着溝103の内側面103cとの間で傾斜を解消するような変形を受け、その結果、バックアップリング105の内周面及び外周面が、装着溝103の溝底面及び外周部材101の内周面101aに密接される(例えば下記の特許文献3参照)。   On the other hand, the sealing device shown in FIG. 16 has the mounting groove 103 in a state where the cross-sectional shape of the backup ring 105 cut along a plane passing through the axis O is a parallelogram and is inclined with respect to the plane orthogonal to the axis O. It is the one installed inside. According to this configuration, as shown in FIG. 17, when the packing 104 receives the pressure P of the high-pressure gas reaching into the mounting groove 103, the backup ring 105 pushed to the low pressure side through the packing 104 is mounted. As a result, the inner peripheral surface and the outer peripheral surface of the backup ring 105 are deformed so as to eliminate the inclination between the inner surface 103 c of the groove 103 and the inner peripheral surface 101 a of the outer peripheral member 101. (See, for example, Patent Document 3 below).

しかしながら、この場合も、バックアップリング105の内周面が溝底面に対して傾斜することにより、パッキング104のはみ出しを許容する隙間G3が形成されることは避けられなかった。 However, in this case as well, it is inevitable that the gap G3 that allows the packing 104 to protrude is formed due to the inner peripheral surface of the backup ring 105 being inclined with respect to the groove bottom surface.

特許第3543617号公報Japanese Patent No. 3543617 特許第3022489号公報Japanese Patent No. 3022489 特許第3695469号公報Japanese Patent No. 3695469

本発明は、以上のような点に鑑みてなされたものであって、その技術的課題とするところは、パッキングの低圧側にバックアップリングを設けた密封装置において、パッキングの一部が低圧側へはみ出して破損するのを確実に防止することにある。 The present invention has been made in view of the above points, and a technical problem thereof is that in a sealing device provided with a backup ring on the low pressure side of the packing, a part of the packing is on the low pressure side. The object is to reliably prevent protrusion and damage.

上述した技術的課題を有効に解決するための手段として、本発明に係る密封装置は、外周部材の内周面とその内周に配置された内周部材の外周面のうちいずれか一方に形成され円周方向へ連続した装着溝内に、ゴム状弾性材料からなるパッキングと、それより低圧側に位置し前記パッキングより剛性の高い材料からなるバックアップリングが装着され、このバックアップリングは、前記パッキング側を向いた一側面の径方向幅が前記装着溝の溝底面からこれと径方向に対向する相手部材までの高さより大きく、前記装着溝への装着状態では、前記一側面及び他側面が前記装着溝における低圧側の内側面に対して同じ方向へ傾斜しており、バックアップリングの内周面及び外周面のうち、前記一側面及び他側面の傾斜によって相対的に前記パッキングと反対側へ偏在する側の周面とこれに接する前記溝底面又は相手部材のなす角度が、前記低圧側の内側面に対する他側面の傾斜角度より大きいことを特徴とするものである。   As means for effectively solving the technical problem described above, the sealing device according to the present invention is formed on either the inner peripheral surface of the outer peripheral member or the outer peripheral surface of the inner peripheral member disposed on the inner peripheral surface. A packing made of a rubber-like elastic material and a backup ring made of a material having a rigidity higher than that of the packing are mounted in a mounting groove continuous in the circumferential direction. The radial width of one side surface facing the side is larger than the height from the groove bottom surface of the mounting groove to the mating member opposed to the radial direction, and in the mounting state in the mounting groove, the one side surface and the other side surface are The mounting groove is inclined in the same direction with respect to the inner surface on the low-pressure side, and the pad is relatively moved by the inclination of the one side surface and the other side surface of the inner and outer peripheral surfaces of the backup ring. Angle of the groove bottom or mating member peripheral surface contact therewith on the side of ubiquitous to ring opposite side, and is characterized in that the larger than the inclination angle of the other side surface with respect to the inner surface of the low-pressure side.

上記構成において、パッキングが、装着溝内へ達する高圧ガスの圧力を受けると、このパッキングを介して低圧側へ押されるバックアップリングは、パッキングと反対側を向いた他側面が、装着溝における低圧側の内側面に対して傾斜していて両者間に隙間を有するため、その隙間を減少させる方向へ起立するように変形される。このバックアップリングは、パッキング側を向いた一側面の径方向幅が装着溝の溝底面からこれと径方向に対向する相手部材までの高さより大きいため、起立変形によって、前記一側面の径方向両縁が溝底面及び相手部材へ押し付けられる。   In the above configuration, when the packing receives the pressure of the high pressure gas reaching the mounting groove, the backup ring pushed to the low pressure side through this packing has the other side facing the opposite side of the packing on the low pressure side in the mounting groove. Since it is inclined with respect to the inner surface and has a gap between the two, it is deformed so as to stand in a direction to reduce the gap. This backup ring has a radial width on one side facing the packing side that is larger than the height from the groove bottom surface of the mounting groove to the opposite member in the radial direction. The edge is pressed against the groove bottom surface and the mating member.

しかも、このバックアップリングは、傾斜によって相対的にパッキングと反対側へ偏在する側の周面がこれに接する前記溝底面又は相手部材に対してなす角度が、前記低圧側の内側面に対する他側面の傾斜角度より大きいため、起立変形によって前記内周面又は外周面がパッキング側で浮き上がることはなく、このためパッキング側を向いた一側面の径方向両縁と、溝底面及び相手部材の密接状態が維持され、パッキングのはみ出しを許容する隙間が形成されない。   In addition, the back-up ring has an angle formed on the groove bottom surface or the mating member that is in contact with the peripheral surface on the side that is relatively inclined to the side opposite to the packing due to the inclination, on the other side surface with respect to the inner side surface on the low-pressure side. Since it is larger than the inclination angle, the inner peripheral surface or the outer peripheral surface does not float on the packing side due to the standing deformation, and therefore, the radial both edges of one side facing the packing side, the groove bottom surface and the mating state of the mating member are It is maintained, and a gap that allows the protrusion of the packing is not formed.

すなわち、本発明に係る密封装置によれば、パッキングが、装着溝内へ達する高圧ガスの圧力を受けても、バックアップリングの内周側及び外周側に隙間を生じることはなく、したがって高圧条件で使用しても、パッキングのはみ出しや、これに起因する破損を確実に防止することができる。   That is, according to the sealing device according to the present invention, even when the packing receives the pressure of the high-pressure gas reaching into the mounting groove, no gap is formed on the inner peripheral side and the outer peripheral side of the backup ring, and therefore, under high pressure conditions. Even if it is used, it is possible to reliably prevent the protrusion of the packing and the damage resulting therefrom.

以下、本発明に係る密封装置の好ましい実施の形態を、図面を参照しながら説明する。図1は、第一の形態を、軸心Oを通る平面で切断して示す片側断面図、図2は、第一の形態におけるバックアップリングの断面形状を特定するための説明図、図3は、第一の形態において、バックアップリングが僅かに押された状態を、軸心Oを通る平面で切断して示す片側断面図、図4は、第一の形態において、バックアップリングが完全に起立した状態を、軸心Oを通る平面で切断して示す片側断面図である。   Hereinafter, a preferred embodiment of a sealing device according to the present invention will be described with reference to the drawings. FIG. 1 is a half sectional view showing the first embodiment cut along a plane passing through the axis O, FIG. 2 is an explanatory view for specifying the sectional shape of the backup ring in the first embodiment, and FIG. FIG. 4 is a half sectional view showing a state in which the backup ring is pushed slightly in the first embodiment, by cutting along a plane passing through the axis O, and FIG. 4 shows the backup ring fully upright in the first embodiment. It is a half sectional view showing the state by cutting along a plane passing through the axis O.

まず図1において、参照符号1は円筒状の外周部材、参照符号2はこの外周部材1の内周に軸方向移動可能に配置された円柱状の内周部材である。内周部材2の外周面には、円周方向へ連続した装着溝21が形成されており、この装着溝21には、パッキング3と、その低圧側(密封対象空間と反対側)に位置するバックアップリング4が装着されている。   First, in FIG. 1, reference numeral 1 is a cylindrical outer peripheral member, and reference numeral 2 is a columnar inner peripheral member disposed on the inner periphery of the outer peripheral member 1 so as to be movable in the axial direction. A mounting groove 21 that is continuous in the circumferential direction is formed on the outer peripheral surface of the inner peripheral member 2, and the mounting groove 21 is positioned on the packing 3 and its low-pressure side (opposite to the space to be sealed). A backup ring 4 is attached.

装着溝21は、軸心Oを通る平面で切断した断面形状(図示の断面形状)が略コ字形をなしており、すなわち軸方向両側の溝内側面21a,21bが、軸心Oと直交する平面をなしており、溝底面21cが、内周部材2の外周面と同心の円筒面状に形成されている。   The mounting groove 21 has a substantially U-shaped cross-sectional shape (the cross-sectional shape shown in the figure) cut along a plane passing through the axis O. That is, the groove inner side surfaces 21a and 21b on both sides in the axial direction are orthogonal to the axis O. The groove bottom surface 21 c is formed in a cylindrical surface concentric with the outer peripheral surface of the inner peripheral member 2.

パッキング3は、ゴム状弾性材料で断面円形の環状に成形された、いわゆるOリングからなるものであって、外周部材1の内周面1aと装着溝21の溝底面21cとの間で径方向に適当に圧縮された状態で装着されている。   The packing 3 is made of a so-called O-ring formed of a rubber-like elastic material in an annular shape having a circular cross section, and is radially between the inner peripheral surface 1 a of the outer peripheral member 1 and the groove bottom surface 21 c of the mounting groove 21. It is attached in a state compressed appropriately.

バックアップリング4は、パッキング3のゴム状弾性材料より剛性が高くかつ低摩擦係数のPTFE(四フッ化エチレン)あるいはナイロン系等の合成樹脂材料からなるものであって、パッキング3側を向いた一側面4aと、パッキング1と反対側を向いた他側面4bが互いに平行であり、図2に示されるように、前記一側面4aの径方向幅Laが装着溝21の溝底面21cからこれと径方向に対向する相手部材である外周部材1の内周面1aまでの高さhより大きく、他側面4bの径方向幅Lbが前記高さhより小さいものとなっている。すなわち、
La>h>Lb・・・(1)
となっている。 It has become. また、内周面4cは、前記一側面4a及び他側面4bに対してほぼ直角をなし、外周面4dは、パッキング3と反対側で小径になる円錐面状に形成されている。 Further, the inner peripheral surface 4c is formed at a substantially right angle to the one side surface 4a and the other side surface 4b, and the outer peripheral surface 4d is formed in a conical surface shape having a small diameter on the side opposite to the packing 3. The backup ring 4 is made of a synthetic resin material, such as PTFE (tetrafluoroethylene) or nylon, which has higher rigidity and a lower friction coefficient than the rubber-like elastic material of the packing 3, and faces the packing 3 side. The side surface 4a and the other side surface 4b facing away from the packing 1 are parallel to each other, and the radial width La of the one side surface 4a is from the groove bottom surface 21c of the mounting groove 21 to the diameter as shown in FIG. It is larger than the height h to the inner peripheral surface 1a of the outer peripheral member 1 which is the opposite member facing in the direction, and the radial width Lb of the other side surface 4b is smaller than the height h. That is, The backup ring 4 is made of a synthetic resin material, such as PTFE (tetrafluoroethylene) or nylon, which has higher rigidity and a lower friction coefficient than the rubber-like elastic material of the packing 3, and faces the packing 3 side. side surface 4a and the other side surface 4b facing away from the packing 1 are parallel to each other, and the radial width La of the one side surface 4a is from the groove bottom surface 21c of the mounting groove 21 to the diameter as shown in FIG. It is larger than the height h to the inner peripheral surface 1a of the outer peripheral member 1 which is the opposite member facing in the direction, and the radial width Lb of the other side surface 4b is smaller than the height h. That is,
La>h> Lb (1) La> h> Lb (1)
It has become. The inner peripheral surface 4 c is substantially perpendicular to the one side surface 4 a and the other side surface 4 b, and the outer peripheral surface 4 d is formed in a conical surface shape having a small diameter on the side opposite to the packing 3. It has become. The inner peripheral surface 4 c is substantially perpendicular to the one side surface 4 a and the other side surface 4 b, and the outer peripheral surface 4 d is formed in a conical surface shape having a small diameter on the side opposite to the packing 3.

このバックアップリング4は、(1)式の寸法関係を有すること、及び外周面4dがパッキング3と反対側で小径になる円錐面状をなすことによって、装着状態では、外周側がパッキング3側へ偏在するように傾斜しており、すなわち一側面4a及び他側面4bが、軸心Oと直交する平面に対してパッキング3側へ倒れるように、同方向へ傾斜している。そしてこの傾斜状態では、バックアップリング4の内周面4cが、請求項1に記載された「傾斜によって相対的にパッキングと反対側へ偏在する側の周面」に相当するものであり、この内周面4cが、装着溝21の溝底面21cに対してなす傾斜角度をθ、他側面4bが装着溝21の低圧側の内側面21bに対してなす傾斜角度をθとすると、
θ >θ ・・・(2) θ 1 > θ 2 ... (2)
となっている。 It has become. 言い換えれば他側面4bと内周面4cのなす角度は、ほぼ直角ではあるものの、厳密には直角より僅かに大きい。 In other words, the angle formed by the other side surface 4b and the inner peripheral surface 4c is almost a right angle, but strictly speaking, it is slightly larger than the right angle. This backup ring 4 has a dimensional relationship of the expression (1) and has a conical surface shape in which the outer peripheral surface 4d has a small diameter on the side opposite to the packing 3, so that the outer peripheral side is unevenly distributed toward the packing 3 in the mounted state. In other words, the one side surface 4a and the other side surface 4b are inclined in the same direction so as to fall to the packing 3 side with respect to a plane orthogonal to the axis O. In this inclined state, the inner peripheral surface 4c of the backup ring 4 corresponds to the "peripheral surface on the side that is relatively unevenly distributed to the side opposite to the packing due to the inclination" described in claim 1, The inclination angle formed by the peripheral surface 4c with respect to the groove bottom surface 21c of the mounting groove 21 is θ 1 , and the inclination angle formed by the other side surface 4b with respect to the inner side surface 21b on the lo This backup ring 4 has a dimensional relationship of the expression (1) and has a conical surface shape in which the outer peripheral surface 4d has a small diameter on the side opposite to the packing 3, so that the outer peripheral side is unevenly distributed toward The packing 3 in the mounted state. In other words, the one side surface 4a and the other side surface 4b are inclined in the same direction so as to fall to the packing 3 side with respect to a plane diameter to the axis O. In This inclined state, the inner peripheral surface 4c of the backup ring 4 corresponds to the "peripheral surface on the side that is relatively unevenly distributed to the side opposite to the packing due to the approach" described in claim 1, The approach angle formed by the peripheral surface 4c with respect to the groove bottom surface 21c of the mounting groove 21 is θ 1 , and the approach angle formed by the other side surface 4b with respect to the inner side surface 21b on the lo w pressure side of the mounting groove 21 is θ 2 . w pressure side of the mounting groove 21 is θ 2 .
θ 1 > θ 2 (2) θ 1 > θ 2 (2)
It has become. In other words, the angle formed by the other side surface 4b and the inner peripheral surface 4c is substantially a right angle, but strictly speaking, is slightly larger than the right angle. It has become. In other words, the angle formed by the other side surface 4b and the inner peripheral surface 4c is substantially a right angle, but strictly speaking, is slightly larger than the right angle.

また、一側面4aと外周面4dのなす角度(一側面4aの外径縁4fの角度)をθ 、一側面4aと溝底面21cのなす角度をθ とすると、
θ >θ ・・・(3)
となっている。
Further, if the angle formed by the one side surface 4a and the outer peripheral surface 4d (the angle of the outer diameter edge 4f of the one side surface 4a) is θ 3 and the angle formed by the one side surface 4a and the groove bottom surface 21c is θ 4 ,
θ 4 > θ 3 (3)
It has become.

以上の構成を備える第一の形態の密封装置は、図の右側の空間(不図示)に存在する高圧のガスを密封対象とするものであって、そのガス圧Pは、外周部材1と内周部材2との間の隙間を介して装着溝21内に達している。このため、ガス圧Pの上昇に伴い、パッキング3が装着溝21内を低圧側(図中左側)へ移動して、図3に示されるようにバックアップリング4を押圧するので、このバックアップリング4は、図1及び図2の傾斜状態から起立するように変形される。   The sealing device according to the first embodiment having the above-described configuration is intended to seal high-pressure gas existing in the right space (not shown) in the figure, and the gas pressure P is the same as that of the outer peripheral member 1 and the inner member. It reaches into the mounting groove 21 via a gap between the peripheral member 2 and the peripheral member 2. For this reason, as the gas pressure P increases, the packing 3 moves in the mounting groove 21 to the low pressure side (left side in the figure) and presses the backup ring 4 as shown in FIG. Is deformed so as to stand up from the inclined state of FIGS. 1 and 2.

ここで、バックアップリング4は、図2に示されるように、La>hであるため、図3のように起立変形されるのに伴い、前記一側面4aの内径縁4e及び外径縁4fが、溝底面21c及び外周部材1の内周面1aに押し付けられることになる。しかも、このバックアップリング4は、図2の状態においてθ>θであるため、図4に示されるように、他側面4bが装着溝21の低圧側の内側面21bと密接した状態、言い換えればθが直角になるまで起立変形されても、前記内周面4cがパッキング3側で溝底面21cから浮き上がることはない。したがって、バックアップリング4の一側面4aの径方向両縁4e,4fと、溝底面21c及び外周部材1の内周面1aとの密接状態が維持され、パッキング3のはみ出しが確実に防止される。 Here, as shown in FIG. 2, since the backup ring 4 is La> h, the inner diameter edge 4e and the outer diameter edge 4f of the one side surface 4a are changed as shown in FIG. The groove bottom surface 21c and the inner peripheral surface 1a of the outer peripheral member 1 are pressed. Moreover, since this backup ring 4 satisfies θ 1 > θ 2 in the state of FIG. 2, as shown in FIG. 4, the other side surface 4 b is in close contact with the inner side surface 21 b on the low pressure side of the mounting groove 21, in other words. if be erected deformed to theta 4 is at right angles, the inner circumferential surface 4c is never lifted from the groove bottom surface 21c in the packing 3. Therefore, the radial close edges 4e and 4f of the side surface 4a of the backup ring 4 and the groove bottom surface 21c and the inner peripheral surface 1a of the outer peripheral member 1 are maintained in close contact with each other, and the protrusion of the packing 3 is reliably prevented.

次に、図5は、本発明に係る密封装置の第二の形態を、軸心Oを通る平面で切断して示す片側断面図、図6は、第二の形態におけるバックアップリングの断面形状を特定するための説明図、図7は、第二の形態において、バックアップリングが僅かに押された状態を、軸心Oを通る平面で切断して示す片側断面図、図8は、第二の形態において、バックアップリングが完全に起立した状態を、軸心Oを通る平面で切断して示す片側断面図である。   Next, FIG. 5 is a half sectional view showing a second embodiment of the sealing device according to the present invention by cutting along a plane passing through the axis O, and FIG. 6 is a sectional view of the backup ring in the second embodiment. FIG. 7 is an explanatory diagram for identifying, FIG. 7 is a half sectional view showing a state in which the backup ring is slightly pushed in the second embodiment, cut along a plane passing through the axis O, and FIG. In a form, it is the one side sectional view which cuts and shows the state where a backup ring stood completely in the plane which passes along axis O.

この第二の形態は、図5に示されるように、バックアップリング4の断面形状が、第一の形態によるバックアップリング4と径方向に対称の形状となっているものである。詳しくは、パッキング3側を向いた一側面4aと、パッキング3と反対側を向いた他側面4bが互いに平行であり、図6に示されるように、先に説明した(1)式のような寸法関係を有する。また、内周面4cは、パッキング3と反対側で小径になる円錐面状に形成され、外周面4dは、前記一側面4a及び他側面4bに対してほぼ直角をなしている。   In the second form, as shown in FIG. 5, the cross-sectional shape of the backup ring 4 is symmetrical to the backup ring 4 according to the first form in the radial direction. Specifically, one side surface 4a facing the packing 3 side and the other side surface 4b facing the opposite side to the packing 3 are parallel to each other, and as shown in FIG. Has a dimensional relationship. The inner peripheral surface 4c is formed in a conical surface having a small diameter on the side opposite to the packing 3, and the outer peripheral surface 4d is substantially perpendicular to the one side surface 4a and the other side surface 4b.

そして、このバックアップリング4は、(1)式の寸法関係を有すること、及び内周面4cがパッキング3と反対側で大径になる円錐面状をなすことによって、装着状態では、外周側がパッキング3と反対側へ偏在するように傾斜しており、すなわち一側面4a及び他側面4bが、軸心Oと直交する平面に対してパッキング3と反対側へ倒れるように、同方向へ傾斜している。すなわちこの傾斜状態では、バックアップリング4の外周面4dが、請求項1に記載された「傾斜によって相対的にパッキングと反対側へ偏在する側の周面」に相当するものであり、この外周面4dが外周部材1の内周面1aに対してなす傾斜角度をθ11、他側面4bが装着溝21の低圧側の内側面21bに対してなす傾斜角度をθ12とすると、
θ 11 >θ 12・・・(4) θ 11 > θ 12 ... (4)
となっており、言い換えれば他側面4bと外周面4dのなす角度は、ほぼ直角ではあるものの、厳密には直角より僅かに大きい。 In other words, the angle formed by the other side surface 4b and the outer peripheral surface 4d is almost a right angle, but strictly speaking, it is slightly larger than the right angle. The backup ring 4 has a dimensional relationship of the formula (1), and the inner peripheral surface 4c has a conical surface shape having a large diameter on the opposite side to the packing 3, so that the outer peripheral side is the packing in the mounted state. In other words, the one side surface 4a and the other side surface 4b are inclined in the same direction so that the side surface 4a and the other side surface 4b are inclined to the opposite side of the packing 3 with respect to the plane orthogonal to the axis O. Yes. That is, in this inclined state, the outer peripheral surface 4d of the backup ring 4 corresponds to the “peripheral surface on the side that is relatively unevenly distributed on the opposite side of the packing due to the inclination” described in claim 1. If the inclination angle 4d forms with respect to the inner peripheral surface 1a of the outer peripheral member 1 is θ 11 , and the inclination angle formed by the other side surface 4b with respect to The backup ring 4 has a dimensional relationship of the formula (1), and the inner peripheral surface 4c has a conical surface shape having a large diameter on the opposite side to the packing 3, so that the outer peripheral side is the packing in the mounted state. In other words, the one side surface 4a and the other side surface 4b are inclined in the same direction so that the side surface 4a and the other side surface 4b are inclined to the opposite side of the packing 3 with respect to the plane orthogonal to the axis O. Yes. That is, in this inclined state, the outer peripheral surface 4d of the backup ring 4 corresponds to the “peripheral surface on the side that is relatively unevenly distributed on the opposite side of the packing due to the approach ”described in claim 1. If the approach angle 4d forms with respect to the inner peripheral surface 1a of the outer peripheral member 1 is θ 11 , and the approach angle formed by the other side surface 4b with respect to the inner side surface 21b on the low pressure side of the mounting groove 21 is θ 12 , the inner side surface 21b on the low pressure side of the mounting groove 21 is θ 12 ,
θ 11 > θ 12 (4) θ 11 > θ 12 (4)
In other words, the angle formed by the other side surface 4b and the outer peripheral surface 4d is substantially a right angle, but strictly speaking, it is slightly larger than the right angle. In other words, the angle formed by the other side surface 4b and the outer peripheral surface 4d is substantially a right angle, but strictly speaking, it is slightly larger than the right angle.

また、一側面4aと内周面4cのなす角度(一側面4aの内径縁4eの角度)をθ 13 、一側面4aと外周部材1の内周面1aのなす角度をθ 14とすると、
θ 14 >θ 13・・・(5)
となっている。
Further, if an angle formed by the one side surface 4a and the inner peripheral surface 4c (an angle of the inner diameter edge 4e of the one side surface 4a) is θ 13 , and an angle formed by the one side surface 4a and the inner peripheral surface 1a of the outer peripheral member 1 is θ 14 ,

θ 14 > θ 13 (5) θ 14 > θ 13 (5)
It has become. It has become.

なお、その他の構成は、基本的に第一の形態と同様である。 Other configurations are basically the same as those in the first embodiment.

以上の構成を備える第二の形態の密封装置も、第一の形態と同様、図の右側の空間(不図示)に存在する高圧のガスを密封対象とするものであって、そのガス圧Pは、外周部材1と内周部材2との間の隙間を介して装着溝21内に達している。このため、ガス圧Pの上昇に伴い、パッキング3が装着溝21内を低圧側(図中左側)へ移動して、図7に示されるようにバックアップリング4を押圧するので、このバックアップリング4は、図5及び図6の傾斜状態から起立するように変形される。   Similarly to the first embodiment, the sealing device of the second embodiment having the above configuration is intended to seal a high-pressure gas existing in a space (not shown) on the right side of the drawing, and its gas pressure P Reaches the inside of the mounting groove 21 through a gap between the outer peripheral member 1 and the inner peripheral member 2. For this reason, as the gas pressure P increases, the packing 3 moves in the mounting groove 21 to the low pressure side (left side in the figure) and presses the backup ring 4 as shown in FIG. Is deformed so as to stand up from the inclined state of FIGS. 5 and 6.

ここで、バックアップリング4は、図6に示されるように、La>hであるため、図7のように起立変形されるのに伴い、前記一側面4aの内径縁4e及び外径縁4fが、溝底面21c及び外周部材1の内周面1aに押し付けられることになる。しかも、このバックアップリング4は、図6の状態においてθ11>θ12であるため、図8に示されるように、他側面4bが装着溝21の低圧側の内側面21bと密接した状態、言い換えればθ14が直角になるまで起立変形されても、前記外周面4dがパッキング3側で外周部材1の内周面1aから浮き上がることはない。したがって、バックアップリング4の一側面4aの径方向両縁4e,4fと、溝底面21c及び外周部材1の内周面1aとの密接状態が維持され、パッキング3のはみ出しが確実に防止される。 Here, since the backup ring 4 is La> h as shown in FIG. 6, the inner diameter edge 4 e and the outer diameter edge 4 f of the one side surface 4 a are changed along with the upright deformation as shown in FIG. 7. The groove bottom surface 21c and the inner peripheral surface 1a of the outer peripheral member 1 are pressed. Moreover, since this backup ring 4 satisfies θ 11 > θ 12 in the state of FIG. 6, as shown in FIG. 8, the other side surface 4 b is in close contact with the inner side surface 21 b on the low pressure side of the mounting groove 21, in other words. if even theta 14 is erected deformed to a right angle, the outer circumferential surface 4d never lifted from the inner circumferential surface 1a of the outer member 1 in the packing 3. Therefore, the radial close edges 4e and 4f of the side surface 4a of the backup ring 4 and the groove bottom surface 21c and the inner peripheral surface 1a of the outer peripheral member 1 are maintained in close contact with each other, and the protrusion of the packing 3 is reliably prevented.

図9〜図12は、それぞれ本発明に係る密封装置の更に他の形態として、バックアップリングの断面形状の異なる例を、軸心Oを通る平面で切断して示す片側断面図である。   FIG. 9 to FIG. 12 are one-side cross-sectional views showing examples of different cross-sectional shapes of the backup ring cut along a plane passing through the axis O as still another embodiment of the sealing device according to the present invention.

このうち、まず図9に示される第三の形態は、バックアップリング4の軸方向肉厚が外周側ほど大きくなるように、パッキング3側を向いた一側面4aと、その反対側を向いた他側面4bが互いに非平行に形成されたものであり、それ以外は、図1に示される第一の形態と同様に構成されている。そして、図示の装着状態では、外周側がパッキング3側へ偏在するように傾斜しており、上述のように一側面4aと他側面4bが互いに非平行であることによって、軸心Oと直交する平面に対する他側面4bの傾斜角度が、一側面4aよりも小さなものとなっている。またこの場合も、先に説明した図2に示されるような寸法及び角度関係、すなわち(1)〜(3)式が当てはまるものである。   Of these, first, the third embodiment shown in FIG. 9 is one side 4a facing the packing 3 side and the other facing the other side so that the axial thickness of the backup ring 4 increases toward the outer peripheral side. The side surfaces 4b are formed non-parallel to each other, and the rest is configured in the same manner as the first embodiment shown in FIG. In the mounted state shown in the figure, the outer peripheral side is inclined so as to be unevenly distributed toward the packing 3 side, and as described above, the one side surface 4a and the other side surface 4b are not parallel to each other, so that the plane perpendicular to the axis O is obtained. The inclination angle of the other side surface 4b is smaller than that of the one side surface 4a. Also in this case, the dimensional and angular relationships as shown in FIG. 2 described above, that is, the expressions (1) to (3) are applicable.

以上の構成を備える第三の形態の密封装置も、図の右側の空間(不図示)からパッキング3に作用するガス圧Pによって、バックアップリング4が図示の傾斜状態から起立するように変形され、その一側面4aにおける径方向両縁4e,4fと、溝底面21c及び外周部材1の内周面1aとの密接状態が維持されるので、パッキング3のはみ出しが確実に防止される。そして、軸心Oと直交する平面に対する他側面4bの傾斜角度が、一側面4aよりも小さいため、起立変形量が小さくなり、他側面4bが装着溝21における低圧側の内側面21bと密接するまで起立しても、溝底面21cに対して一側面4aのなす角度が90°より小さなものとなる。   The sealing device of the third form having the above configuration is also deformed so that the backup ring 4 stands up from the illustrated inclined state by the gas pressure P acting on the packing 3 from the space (not shown) on the right side of the figure. Since the two edges 4e and 4f in the radial direction on one side surface 4a and the groove bottom surface 21c and the inner peripheral surface 1a of the outer peripheral member 1 are maintained in close contact, the protrusion of the packing 3 is reliably prevented. Since the inclination angle of the other side surface 4b with respect to the plane orthogonal to the axis O is smaller than that of the one side surface 4a, the amount of standing deformation is reduced, and the other side surface 4b is in close contact with the inner side surface 21b on the low pressure side in the mounting groove 21. Even if it stands up, the angle formed by the one side surface 4a with respect to the groove bottom surface 21c is smaller than 90 °.

また、図10に示される第四の形態は、第三の形態とは逆に、バックアップリング4の軸方向肉厚が内周側ほど大きくなるように、パッキング3側を向いた一側面4aと、その反対側を向いた他側面4bが互いに非平行に形成されたものであり、それ以外は、先に説明した図5に示される第二の形態と同様に構成されている。したがって、図示の装着状態では、外周側がパッキング3と反対側へ偏在するように傾斜しており、上述のように一側面4aと他側面4bが互いに非平行であることによって、軸心Oと直交する平面に対する他側面4bの傾斜角度が、一側面4aよりも小さなものとなっている。そしてこの場合も、先に説明した図6に示されるような寸法及び角度関係、すなわち(1)(4)(5)式が当てはまるものである。   Further, in the fourth embodiment shown in FIG. 10, contrary to the third embodiment, one side surface 4a facing the packing 3 side so that the axial thickness of the backup ring 4 increases toward the inner peripheral side. The other side surface 4b facing the opposite side is formed non-parallel to the other side, and the other configuration is the same as that of the second embodiment shown in FIG. 5 described above. Accordingly, in the illustrated mounting state, the outer peripheral side is inclined so as to be unevenly distributed to the side opposite to the packing 3, and as described above, the one side surface 4a and the other side surface 4b are not parallel to each other, thereby being orthogonal to the axis O. The inclination angle of the other side surface 4b with respect to the flat surface is smaller than that of the one side surface 4a. In this case as well, the dimensional and angular relationships as shown in FIG. 6 described above, that is, the equations (1), (4), and (5) apply.

以上の構成を備える第四の形態の密封装置も、図の右側の空間(不図示)からパッキング3に作用するガス圧Pによって、バックアップリング4が図示の傾斜状態から起立するように変形され、その一側面4aにおける径方向両縁4e,4fと、溝底面21c及び外周部材1の内周面1aとの密接状態が維持されるので、パッキング3のはみ出しが確実に防止される。そして、軸心Oと直交する平面に対する他側面4bの傾斜角度が、一側面4aよりも小さいため、起立変形量が小さくなり、他側面4bが装着溝21における低圧側の内側面21bと密接するまで起立しても、外周部材1の内周面1aに対して一側面4aのなす角度が90°より小さなものとなる。   The sealing device of the fourth embodiment having the above configuration is also deformed so that the backup ring 4 rises from the illustrated inclined state by the gas pressure P acting on the packing 3 from the space (not shown) on the right side of the drawing, Since the two edges 4e and 4f in the radial direction on one side surface 4a and the groove bottom surface 21c and the inner peripheral surface 1a of the outer peripheral member 1 are maintained in close contact, the protrusion of the packing 3 is reliably prevented. Since the inclination angle of the other side surface 4b with respect to the plane orthogonal to the axis O is smaller than that of the one side surface 4a, the amount of standing deformation is reduced, and the other side surface 4b is in close contact with the inner side surface 21b on the low pressure side in the mounting groove 21. Even if it stands up, the angle formed by the one side surface 4a with respect to the inner peripheral surface 1a of the outer peripheral member 1 is smaller than 90 °.

また、図11及び図12に示される第五の形態は、バックアップリング4の一側面4aと他側面4bが互いに平行で、内周面4cが、パッキング3と反対側で大径になる円錐面状に形成され、外周面4dが、パッキング3と反対側で小径になる円錐面状に形成され、内周面4cと他側面4bのなす角度と、外周面4dと他側面4bのなす角度が互いに等しく、すなわち断面形状が一側面4aを下底とし他側面4bを上底とする台形をなすものである。そしてこの場合も、先に説明した図2又は図6に示されるような寸法及び角度関係、すなわち(1)〜(5)式が当てはまる。   11 and 12 is a conical surface in which one side surface 4a and the other side surface 4b of the backup ring 4 are parallel to each other, and the inner peripheral surface 4c has a large diameter on the side opposite to the packing 3. The outer peripheral surface 4d is formed in a conical shape having a small diameter on the side opposite to the packing 3, and the angle formed between the inner peripheral surface 4c and the other side surface 4b and the angle formed between the outer peripheral surface 4d and the other side surface 4b are They are equal to each other, that is, their cross-sectional shapes form a trapezoid having one side surface 4a as the bottom and the other side surface 4b as the top. In this case as well, the dimensional and angular relationships as shown in FIG. 2 or FIG. 6, that is, the expressions (1) to (5) apply.

この第五の形態によれば、内周面4c及び外周面4dが互いに対称形状であるため、図11に示されるように、外周側がパッキング3側へ偏在するように傾斜し、あるいは図12に示されるように、内周側がパッキング3側へ偏在するように傾斜した状態で装着することができる。そしていずれの場合も、図の右側の空間(不図示)からパッキング3に作用するガス圧Pによって、バックアップリング4が図示の傾斜状態から起立するように変形され、その一側面4aにおける径方向両縁4e,4fと、溝底面21c及び外周部材1の内周面1aとの密接状態が維持されるので、パッキング3のはみ出しが確実に防止される。   According to the fifth embodiment, since the inner peripheral surface 4c and the outer peripheral surface 4d are symmetrical to each other, as shown in FIG. 11, the outer peripheral side is inclined so as to be unevenly distributed toward the packing 3, or in FIG. As shown, it can be mounted in an inclined state so that the inner peripheral side is unevenly distributed toward the packing 3 side. In either case, the backup ring 4 is deformed so as to stand up from the inclined state shown in the drawing by the gas pressure P acting on the packing 3 from the space (not shown) on the right side of the figure, and both radial directions on one side surface 4a thereof. Since the edges 4e, 4f, the groove bottom surface 21c, and the inner peripheral surface 1a of the outer peripheral member 1 are maintained in close contact, the protrusion of the packing 3 is reliably prevented.

なお、上述の各形態は、いずれもパッキング3及びバックアップリング4が、内周部材2に形成した装着溝21に装着されているが、外周部材1に形成した装着溝に装着される場合であっても、本発明を同様に適用することができる。   Each of the above-described embodiments is a case where the packing 3 and the backup ring 4 are both mounted in the mounting groove 21 formed in the inner peripheral member 2 but are mounted in the mounting groove formed in the outer peripheral member 1. However, the present invention can be similarly applied.

本発明に係る密封装置の第一の形態を、軸心Oを通る平面で切断して示す片側断面図である。 1 is a half sectional view showing a first embodiment of a sealing device according to the present invention by cutting along a plane passing through an axis O; FIG. 第一の形態におけるバックアップリングの断面形状を特定するための説明図である。 It is explanatory drawing for pinpointing the cross-sectional shape of the backup ring in a 1st form. 第一の形態において、バックアップリングが僅かに押された状態を、軸心Oを通る平面で切断して示す片側断面図である。 FIG. 3 is a one-side cross-sectional view showing a state in which the backup ring is slightly pushed in a first form by cutting along a plane passing through the axis O; 第一の形態において、バックアップリングが起立した状態を、軸心Oを通る平面で切断して示す片側断面図である。 FIG. 3 is a one-side cross-sectional view showing a state in which the backup ring is erected in a first form by cutting along a plane passing through an axis O; 本発明に係る密封装置の第二の形態を、軸心Oを通る平面で切断して示す片側断面図である。 It is a half sectional view which cuts and shows the 2nd form of the sealing device which concerns on this invention by the plane which passes along the axis O. 第二の形態におけるバックアップリングの断面形状を特定するための説明図である。 It is explanatory drawing for pinpointing the cross-sectional shape of the backup ring in a 2nd form. 第二の形態において、バックアップリングが僅かに押された状態を、軸心Oを通る平面で切断して示す片側断面図である。 In a 2nd form, it is the half sectional view which cut | disconnects and shows the state by which the backup ring was pushed slightly in the plane which passes along the axial center O. FIG. 第二の形態において、バックアップリングが起立した状態を、軸心Oを通る平面で切断して示す片側断面図である。 In a 2nd form, it is the half sectional view which cut | disconnects and shows the state which the backup ring stood up by the plane which passes along the axial center O. FIG. 本発明に係る密封装置の第三の形態を、軸心Oを通る平面で切断して示す片側断面図である。 It is a half sectional view which cuts and shows the 3rd form of the sealing device which concerns on this invention by the plane which passes along the axial center O. FIG. 本発明に係る密封装置の第四の形態を、軸心Oを通る平面で切断して示す片側断面図である。 It is a half sectional view which cuts and shows the 4th form of the sealing device which concerns on this invention by the plane which passes along the axis O. 本発明に係る密封装置の第五の形態を、軸心Oを通る平面で切断して示す片側断面図である。 FIG. 10 is a half sectional view showing a fifth embodiment of the sealing device according to the present invention by cutting along a plane passing through an axis O; 第五の形態において、バックアップリングの傾斜方向を図11と逆にした状態を、軸心Oを通る平面で切断して示す片側断面図である。 FIG. 13 is a half sectional view showing a state in which the inclination direction of the backup ring is reversed to that of FIG. パッキングのみによる従来の密封装置を、軸心Oを通る平面で切断して示す片側断面図である。 FIG. 6 is a one-side cross-sectional view showing a conventional sealing device using only packing by cutting along a plane passing through an axis O; パッキングとバックアップリングを併用した従来の密封装置を、軸心Oを通る平面で切断して示す片側断面図である。 FIG. 6 is a half sectional view showing a conventional sealing device using a packing and a backup ring in combination by cutting along a plane passing through an axis O. パッキングとバックアップリングを併用した従来の他の密封装置を、軸心Oを通る平面で切断して示す片側断面図である。 FIG. 6 is a half sectional view showing another conventional sealing device using a packing and a backup ring cut along a plane passing through an axis O. パッキングとバックアップリングを併用した従来の他の密封装置を、軸心Oを通る平面で切断して示す片側断面図である。 FIG. 6 is a half sectional view showing another conventional sealing device using a packing and a backup ring cut along a plane passing through an axis O. 図16の密封装置が高圧を受けた状態を、軸心Oを通る平面で切断して示す片側断面図である。 FIG. 17 is a half sectional view showing a state where the sealing device of FIG. 16 is subjected to high pressure by cutting along a plane passing through an axis O;

符号の説明Explanation of symbols

1 外周部材
2 内周部材
21 装着溝
21a,21b 内側面
21c 溝底面
3 パッキング
4 バックアップリング
4a 一側面
4b 他側面
4c 内周面
4d 外周面
4e 内径縁
4f 外径縁
DESCRIPTION OF SYMBOLS 1 Outer peripheral member 2 Inner peripheral member 21 Mounting groove 21a, 21b Inner side surface 21c Groove bottom surface 3 Packing 4 Backup ring 4a One side surface 4b Other side surface 4c Inner peripheral surface 4d Outer peripheral surface 4e Inner diameter edge 4f Outer diameter edge

Claims (1)

  1. 外周部材の内周面とその内周に配置された内周部材の外周面のうちいずれか一方に形成され円周方向へ連続した装着溝内に、ゴム状弾性材料からなるパッキングと、それより低圧側に位置し前記パッキングより剛性の高い材料からなるバックアップリングが装着され、このバックアップリングは、前記パッキング側を向いた一側面の径方向幅が前記装着溝の溝底面からこれと径方向に対向する相手部材までの高さより大きく、前記装着溝への装着状態では、前記一側面及び他側面が前記装着溝における低圧側の内側面に対して同じ方向へ傾斜しており、バックアップリングの内周面及び外周面のうち、前記一側面及び他側面の傾斜によって相対的に前記パッキングと反対側へ偏在する側の周面とこれに接する前記溝底面又は相手部材のなす角度が、前記低圧側の内側面に対する他側面の傾斜角度より大きいことを特徴とする密封装置。   A packing made of a rubber-like elastic material in a mounting groove formed on one of the inner peripheral surface of the outer peripheral member and the outer peripheral surface of the inner peripheral member arranged on the inner periphery thereof, and then A backup ring made of a material that is located on the low pressure side and has a rigidity higher than that of the packing is mounted, and this backup ring has a radial width of one side facing the packing side from the groove bottom surface of the mounting groove in the radial direction. It is larger than the height of the opposing mating member, and in the mounting state in the mounting groove, the one side surface and the other side surface are inclined in the same direction with respect to the low pressure side inner surface in the mounting groove, Of the peripheral surface and the outer peripheral surface, the angle formed by the peripheral surface relatively unevenly distributed to the side opposite to the packing due to the inclination of the one side surface and the other side surface and the groove bottom surface or the mating member But sealing device being greater than the angle of inclination of the other side against the inner surface of the low-pressure side.
JP2007172605A 2007-06-29 2007-06-29 Sealing device Active JP4873173B2 (en)

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WO2010098001A1 (en) * 2009-02-24 2010-09-02 Nok株式会社 Sealing device
WO2010146984A1 (en) * 2009-06-16 2010-12-23 Nok株式会社 Sealing structure
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JP2013113326A (en) * 2011-11-25 2013-06-10 Nok Corp Sealing device
CN104214347A (en) * 2014-08-27 2014-12-17 无锡同心塑料制品有限公司 Sealing device between two objects of performing relative reciprocating motion
CN105980695A (en) * 2013-11-06 2016-09-28 罗伯特·博世有限公司 Valve for the metering of highly pressurized fluid
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AT521648A1 (en) * 2018-09-05 2020-03-15 Avl List Gmbh Support ring, sealing device, sealing arrangement and length-adjustable connecting rod for a reciprocating piston machine

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JP6256117B2 (en) 2014-03-11 2018-01-10 Nok株式会社 Sealing device

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JPH08135795A (en) * 1994-11-14 1996-05-31 Nok Corp Sealing device
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JPH08135795A (en) * 1994-11-14 1996-05-31 Nok Corp Sealing device
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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8474829B2 (en) 2009-02-24 2013-07-02 Nok Corporation Sealing device
JP2010196751A (en) * 2009-02-24 2010-09-09 Nok Corp Sealing device
WO2010098001A1 (en) * 2009-02-24 2010-09-02 Nok株式会社 Sealing device
WO2010146984A1 (en) * 2009-06-16 2010-12-23 Nok株式会社 Sealing structure
JP2011007214A (en) * 2009-06-23 2011-01-13 Nok Corp Sealing device
JP2011021723A (en) * 2009-07-17 2011-02-03 Nok Corp Sealing structure
EP2474761A4 (en) * 2009-08-31 2016-10-19 Eagle Ind Co Ltd Contaminant sealing device
JP2011153636A (en) * 2010-01-26 2011-08-11 Higashio Mech Co Ltd Pipe joint
JP2013113326A (en) * 2011-11-25 2013-06-10 Nok Corp Sealing device
EP3066332B1 (en) * 2013-11-06 2020-11-11 Robert Bosch GmbH Valve for the metering of highly pressurized fluid
CN105980695A (en) * 2013-11-06 2016-09-28 罗伯特·博世有限公司 Valve for the metering of highly pressurized fluid
JP2016538474A (en) * 2013-11-06 2016-12-08 ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング Valve for metering fluid under high pressure
US10378653B2 (en) 2013-11-06 2019-08-13 Robert Bosch Gmbh Valve for the metering of highly pressurized fluid
CN104214347A (en) * 2014-08-27 2014-12-17 无锡同心塑料制品有限公司 Sealing device between two objects of performing relative reciprocating motion
AT521648A1 (en) * 2018-09-05 2020-03-15 Avl List Gmbh Support ring, sealing device, sealing arrangement and length-adjustable connecting rod for a reciprocating piston machine

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