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WO2019181461A1 - Sealing device - Google Patents

Sealing device Download PDF

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Publication number
WO2019181461A1
WO2019181461A1 PCT/JP2019/008386 JP2019008386W WO2019181461A1 WO 2019181461 A1 WO2019181461 A1 WO 2019181461A1 JP 2019008386 W JP2019008386 W JP 2019008386W WO 2019181461 A1 WO2019181461 A1 WO 2019181461A1
Authority
WO
WIPO (PCT)
Prior art keywords
packing
backup ring
sealing device
annular
peripheral surface
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.)
Ceased
Application number
PCT/JP2019/008386
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French (fr)
Japanese (ja)
Inventor
大介 松本
健 渡邉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nok Corp
Original Assignee
Nok Corp
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 Nok Corp filed Critical Nok Corp
Priority to JP2019549487A priority Critical patent/JP6756053B2/en
Priority to CN201980002076.9A priority patent/CN110546414A/en
Publication of WO2019181461A1 publication Critical patent/WO2019181461A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
    • 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
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
    • F16J15/3236—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips with at least one lip for each surface, e.g. U-cup packings

Definitions

  • the present invention relates to a sealing device including a backup ring.
  • a packing made of an elastic body such as rubber or urethane has been conventionally used.
  • a part of the packing on the side opposite to the fluid to be sealed may protrude into the gap between the shaft and the housing and may be damaged. Therefore, by arranging a backup ring adjacent to the packing on the side opposite to the fluid to be sealed via the packing, it is possible to suppress a part of the packing from protruding into the gap between the shaft and the housing.
  • the backup ring may be forgotten to be attached, or the backup ring may be accidentally attached to the fluid to be sealed rather than the packing. Thereby, the durable life of packing may fall.
  • an annular notch is formed on the side of the packing opposite to the fluid to be sealed and on the inner peripheral surface, and a backup ring is attached to the notch.
  • the packing and the backup ring are integrated and can be handled as one component. Therefore, it is possible to prevent forgetting to attach the backup ring or erroneous installation.
  • the backup ring since the backup ring has higher rigidity than the packing, there is a problem that it becomes difficult to mount a sealing device in which the packing and the backup ring are integrated in an annular groove provided in the housing. .
  • An object of the present invention is to provide a sealing device that improves the workability of mounting in an annular groove provided in a housing.
  • the present invention employs the following means in order to solve the above problems.
  • the sealing device of the present invention is In a sealing device for sealing an annular gap between a shaft and a housing,
  • the elastic body is mounted in an annular groove provided on the inner peripheral surface of the shaft hole formed in the housing, is in close contact with the groove bottom surface of the annular groove, and is slidably provided on the outer peripheral surface of the shaft.
  • Packing The packing is provided in an annular notch formed on the side opposite to the fluid to be sealed and on the inner peripheral surface side, and a part of the packing protrudes into a gap between the shaft and the housing.
  • a sealing device comprising:
  • the backup ring is The rigidity is higher than that of the packing, and the outer peripheral surface side is constituted by a plurality of divided bodies fixed to the annular notch, The plurality of divided bodies are characterized in that the adjacent divided bodies are not fixed to each other, and are configured to form an annular shape when all the adjacent divided bodies are in close contact with each other.
  • the backup ring is composed of a plurality of divided bodies whose outer peripheral surfaces are fixed to the cutout portions of the packing.
  • the plurality of divided bodies are configured such that adjacent divided bodies are not fixed to each other and form an annular shape when the adjacent divided bodies are all in close contact with each other. Therefore, a part of the backup ring can be easily recessed by pressing the packing radially inward from the outer peripheral surface side. That is, since the divided bodies constituting the backup ring are individually separated, the entire sealing device can be deformed with a force necessary to deform the packing. Therefore, the sealing device can be easily attached to the annular groove provided in the housing.
  • another sealing device of the present invention is In a sealing device for sealing an annular gap between a shaft and a housing,
  • the elastic body is mounted in an annular groove provided on the inner peripheral surface of the shaft hole formed in the housing, is in close contact with the groove bottom surface of the annular groove, and is slidably provided on the outer peripheral surface of the shaft.
  • Packing The packing is provided in an annular notch formed on the side opposite to the fluid to be sealed and on the inner peripheral surface side, and a part of the packing protrudes into a gap between the shaft and the housing.
  • a sealing device comprising:
  • the backup ring is A backup ring main body having higher rigidity than the packing;
  • An annular thin film member having flexibility provided on the outer peripheral surface side of the backup ring body;
  • Consists of The backup ring body is composed of a plurality of divided bodies whose outer peripheral surface side is fixed to the annular thin film member, The plurality of divided bodies are characterized in that the adjacent divided bodies are not fixed to each other, and are configured to form an annular shape when all the adjacent divided bodies are in close contact with each other.
  • a part of the backup ring in the state of the backup ring alone, can be easily recessed by pressing from the outer peripheral surface side inward in the radial direction. And if it attaches to the notch part provided in packing with the backup ring deform
  • the sealing device in which the packing and the backup ring are integrated is mounted in the annular groove provided in the housing, the backup ring is pressed by pressing the packing radially inward from the outer peripheral surface side. Can be easily recessed. That is, since the divided bodies constituting the backup ring main body are individually separated, the entire sealing device can be deformed with a force necessary to deform the packing. Therefore, the sealing device can be easily attached to the annular groove provided in the housing.
  • the backup ring can be attached to the notch of the packing after only the packing is attached to the annular groove provided in the housing. Even in this case, the operation of attaching the packing to the annular groove and the operation of attaching the backup ring to the notch are easy.
  • FIG. 1 is a schematic cross-sectional view of a sealing structure using a sealing device according to Embodiment 1 of the present invention.
  • FIG. 2 is a rear view of the sealing device according to the first embodiment of the present invention.
  • FIG. 3 is a schematic cross-sectional view of the sealing device according to Embodiment 1 of the present invention.
  • FIG. 4 is a partially enlarged view of the sealing device according to Embodiment 1 of the present invention.
  • FIG. 5 is a schematic view showing a state when the sealing device according to the first embodiment of the present invention is mounted in the annular groove.
  • FIG. 6 is a schematic cross-sectional view of a sealing structure using a sealing device according to Embodiment 2 of the present invention.
  • FIG. 1 is a schematic cross-sectional view of a sealing structure using a sealing device according to Embodiment 1 of the present invention.
  • FIG. 2 is a rear view of the sealing device according to the first embodiment of the present invention.
  • FIG. 3 is
  • FIG. 7 is a rear view of the sealing device according to the second embodiment of the present invention.
  • FIG. 8 is a schematic cross-sectional view of a sealing device according to Embodiment 2 of the present invention.
  • FIG. 9 is a rear view of the backup ring according to the second embodiment of the present invention.
  • FIG. 10 is a partially enlarged view of the backup ring according to the second embodiment of the present invention.
  • FIG. 1 is a schematic cross-sectional view of a sealing structure using a sealing device according to Embodiment 1 of the present invention.
  • FIG. 2 is a rear view of the sealing device according to the first embodiment of the present invention.
  • FIG. 3 is a schematic cross-sectional view of the sealing device according to the first embodiment of the present invention, and is a cross-sectional view taken along AA in FIG.
  • FIG. 4 is a partially enlarged view of the sealing device according to the first embodiment of the present invention, and shows a state in which a part of the sealing device is deformed.
  • FIG. 5 is a schematic view showing a state when the sealing device according to the first embodiment of the present invention is mounted in the annular groove.
  • the sealing device 100 plays a role of sealing an annular gap between the shaft 200 and the housing 300 that reciprocally move relative to each other.
  • the right side through the sealing device 100 is the side on which the fluid to be sealed is sealed.
  • the right side is referred to as a sealing target fluid side (H) through the sealing device 100
  • the left side is referred to as a side (L) opposite to the sealing target fluid side (H).
  • the sealing device 100 is mounted in an annular groove 310 provided on the inner peripheral surface of a shaft hole formed in the housing 300.
  • the sealing device 100 includes a packing 110 made of an elastic material such as urethane or rubber, and a backup ring 120a.
  • the packing 110 is provided in close contact with the bottom surface of the annular groove 310 and is slidable on the outer peripheral surface of the shaft 200.
  • the backup ring 120a is provided in an annular notch 114 formed on the packing 110 on the side (L) opposite to the sealing target fluid side (H) and on the inner peripheral surface side.
  • the backup ring 120 a plays a role of suppressing a part of the packing 110 from protruding into the gap between the shaft 200 and the housing 300.
  • the sealing device 100 includes the packing 110 and the backup ring 120a.
  • the packing 110 includes an annular body part (waist part) 111, an outer peripheral lip 112 extending from the body part 111 toward the sealing target fluid side (H) and radially outward, and from the body part 111 to the sealing target fluid side (H). And an inner peripheral lip 113 extending radially inward.
  • the outer peripheral lip 112 is in close contact with the groove bottom surface of the annular groove 310.
  • the inner peripheral lip 113 is slidably provided on the outer peripheral surface of the shaft 200.
  • the packing 110 is provided with the annular notch 114 on the side (L) opposite to the fluid to be sealed (H) and on the inner peripheral surface side.
  • the backup ring 120a is composed of a plurality of divided bodies 121a that are higher in rigidity than the packing 110 and whose outer peripheral surface side is fixed to the annular notch 114.
  • a material of the backup ring 120a for example, a highly rigid resin such as nylon, PTFE, PEEK, PA, or the like can be used.
  • the plurality of divided bodies 121a are configured such that adjacent divided bodies 121a are not fixed to each other and form an annular shape when the adjacent divided bodies 121a are all in close contact with each other.
  • the plurality of divided bodies 121a have the same shape.
  • the number of the divided bodies 121a is appropriately set depending on the outer diameter of the backup ring 120a. For example, when the outer diameter is 80 mm, it is desirable to provide 32 divided bodies 121a.
  • the manufacturing method of the sealing device 100 will be briefly described.
  • the sealing device 100 can be obtained by molding a combination of the packing 110 and the backup ring 120a by two-color molding. Moreover, after shape
  • the backup ring 120 a is configured by a plurality of divided bodies 121 a whose outer peripheral surface side is fixed to the notch 114 of the packing 110.
  • the plurality of divided bodies 121a are configured such that adjacent divided bodies 121a are not fixed to each other, and form an annular shape when the adjacent divided bodies 121a are all in close contact with each other. Therefore, a part of the backup ring 120a can be easily recessed by pressing the packing 110 radially inward from the outer peripheral surface side. That is, as shown in FIG.
  • FIG. 5 shows a state in which the sealing device 100 is attached to the annular groove 310.
  • the sealing device 100 is deformed into a heart shape and mounted in the annular groove 310, and then the recessed portion of the sealing device 100 is pressed radially outward (see arrow Q in the figure). As a result, the sealing device 100 returns to its original shape.
  • the sealing device 100 can be mounted in the annular groove 310.
  • the entire shape of the sealing device 100 is shown in black.
  • FIG. 5 only the groove bottom surface of the annular groove 310 is shown.
  • FIG. 6 is a schematic cross-sectional view of a sealing structure using a sealing device according to Embodiment 2 of the present invention.
  • FIG. 7 is a rear view of the sealing device according to the second embodiment of the present invention.
  • FIG. 8 is a schematic cross-sectional view of the sealing device according to the second embodiment of the present invention, and is a BB cross-sectional view in FIG.
  • FIG. 9 is a rear view of the backup ring according to the second embodiment of the present invention.
  • FIG. 10 is a partially enlarged view of the backup ring according to the second embodiment of the present invention.
  • the sealing device 100 plays a role of sealing an annular gap between the shaft 200 and the housing 300 that reciprocally move relative to each other.
  • the right side through the sealing device 100 is the side on which the fluid to be sealed is sealed.
  • the right side is referred to as a sealing target fluid side (H) through the sealing device 100
  • the left side is referred to as a side (L) opposite to the sealing target fluid side (H).
  • the sealing device 100 is mounted in an annular groove 310 provided on the inner peripheral surface of a shaft hole formed in the housing 300.
  • the sealing device 100 includes a packing 110 made of an elastic material such as urethane or rubber, and a backup ring 120b.
  • the packing 110 is provided in close contact with the bottom surface of the annular groove 310 and is slidable on the outer peripheral surface of the shaft 200.
  • the backup ring 120b is provided in an annular notch 114 formed on the packing 110 on the side (L) opposite to the sealing target fluid side (H) and on the inner peripheral surface side.
  • the backup ring 120 b plays a role of suppressing a part of the packing 110 from protruding into the gap between the shaft 200 and the housing 300.
  • the sealing device 100 includes the packing 110 and the backup ring 120b. Since the configuration of the packing 110 is the same as that of the packing 110 shown in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.
  • the backup ring 120b is composed of a backup ring main body 121b having higher rigidity than the packing 110, and an annular thin film member 122 provided on the outer peripheral surface side of the backup ring main body 121b.
  • the backup ring body 121b is made of a highly rigid resin such as nylon, PTFE, PEEK, or PA.
  • the backup ring main body 121b includes a plurality of divided bodies 121c whose outer peripheral surface side is fixed to the annular thin film member 122.
  • the plurality of divided bodies 121c are configured such that the adjacent divided bodies 121c are not fixed to each other, and form an annular shape when all the adjacent divided bodies 121c are in close contact with each other.
  • a backup ring main body 121b composed of a plurality of divided bodies 121c is formed by injection molding. Thereafter, the annular thin film member 122 is formed by injection molding.
  • the annular thin film member 122 is made of a material such as urethane and has flexibility.
  • the plurality of divided bodies 121c are made of a material (such as nylon) that can be fused to the annular thin film member 122. As described above, by the two-color molding, the plurality of divided bodies 121c are fixed to the inner peripheral surface of the annular thin film member 122 by fusion, and the backup ring 120b is obtained.
  • the backup ring 120 b can also be obtained by separately molding the divided body 121 c and bonding the plurality of divided bodies 121 c to the inner peripheral surface of the annular thin film member 122.
  • the plurality of divided bodies 121c have the same shape.
  • the number of the divided bodies 121c is appropriately set depending on the outer diameter of the backup ring 120b. For example, when the outer diameter is 80 mm, it is desirable to provide 32 divided bodies 121c.
  • the sealing device 100 in which these are integrated can be attached to the annular groove 310 of the housing 300.
  • the packing 110 and the backup ring 120b may be joined (adhered), but it is not necessarily fixed by joining or the like. It is also possible to attach the backup ring 120 b to the notch 114 of the packing 110 after the packing 110 is attached to the annular groove 310 of the housing 300.
  • a part of the backup ring 120b in the state of the backup ring 120b alone, a part of the backup ring 120b can be easily recessed by being pressed radially inward from the outer peripheral surface side. That is, as shown in FIG. 10, when a part of the backup ring 120b is pressed radially inward from the outer peripheral surface side (see arrow P in the figure), the divided bodies 121c constituting the backup ring main body 121b are individually separated. Therefore, a part of the backup ring 120b can be easily recessed.
  • the backup ring 120b is deformed as described above and attached to the notch 114 provided in the packing 110, it can be easily attached even with a weak force. That is, in the first embodiment, similarly to the case where the entire sealing device 100 is deformed into a heart shape and attached to the annular groove 310, the backup ring 120b is easily deformed into the notch 114 with the heart shape deformed. Can be attached. Thereafter, the recessed portion is pushed radially outward to the original shape, so that the annular backup ring 120b is attached to the notch 114 provided in the packing 110.
  • the sealing device 100 in which the packing 110 and the backup ring 120b are integrated is mounted in the annular groove 310 provided in the housing 300, the packing 110 is pressed radially inward from the outer peripheral surface side. By doing so, a part of the backup ring 120b can be easily recessed. That is, since the divided bodies 121c constituting the backup ring 120b are individually separated, the entire sealing device 100 can be deformed by a force necessary to deform the packing 110. Therefore, the sealing device 100 can be easily attached to the annular groove 310 provided in the housing 300.
  • the backup ring 120b may be attached to the notch 114 of the packing 110 after only the packing 110 is attached to the annular groove 310 provided in the housing 300. it can. Even in this case, the operation of attaching the packing 110 to the annular groove 310 and the operation of attaching the backup ring 120b to the notch 114 are easy. By mounting the sealing device 100 in the annular groove 310, sufficient rigidity is obtained in the entire backup ring 120b, and the function as the backup ring 120b is not impaired. It is the same.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Devices (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Abstract

Provided is a sealing device for which the workability of mounting to an annular groove provided in a housing is improved. This sealing device 100 is characterized by being provided with: packing 110 made of an elastic material; and a backup ring 120a, wherein the backup ring 110a has a higher stiffness than the packing 110 and is composed of a plurality of split bodies 121a, the outer peripheral surface sides of which are fixed to an annular notch part 114, and the plurality of split bodies 121a are configured such that adjacent split bodies 121a are not fixed to each other, and the plurality of split bodies 121a form an annular shape when all of the split bodies 121a that are adjacent to each other come into close contact with each other.

Description

密封装置Sealing device

　本発明は、バックアップリングを備える密封装置に関する。 The present invention relates to a sealing device including a backup ring.

　軸とハウジングとの間の環状隙間を封止する密封装置として、従来、ゴムやウレタンなどの弾性体により構成されるパッキンが用いられている。パッキン単体で用いた場合には、パッキンにおける密封対象流体側とは反対側の一部が、軸とハウジングとの間の隙間にはみ出してしまい、破損してしまう虞がある。そこで、パッキンを介して密封対象流体側とは反対側に、パッキンに隣接させてバックアップリングを配置させることで、パッキンの一部が軸とハウジングとの間の隙間にはみ出してしまうことを抑制させる技術が知られている。 As a sealing device for sealing an annular gap between a shaft and a housing, a packing made of an elastic body such as rubber or urethane has been conventionally used. When the packing is used alone, a part of the packing on the side opposite to the fluid to be sealed may protrude into the gap between the shaft and the housing and may be damaged. Therefore, by arranging a backup ring adjacent to the packing on the side opposite to the fluid to be sealed via the packing, it is possible to suppress a part of the packing from protruding into the gap between the shaft and the housing. Technology is known.

　しかしながら、この技術の場合には、バックアップリングを装着し忘れたり、バックアップリングを、誤ってパッキンよりも密封対象流体側に装着させてしまったりすることがある。これにより、パッキンの耐久寿命が低下してしまうことがある。 However, in the case of this technology, the backup ring may be forgotten to be attached, or the backup ring may be accidentally attached to the fluid to be sealed rather than the packing. Thereby, the durable life of packing may fall.

　これに対して、パッキンにおける密封対象流体側とは反対側かつ内周面側に環状の切り欠き部を形成させて、この切り欠き部にバックアップリングを装着させることが考えられる。この場合には、パッキンとバックアップリングが一体化されて、これらを１部品として取り扱うことが可能となる。従って、バックアップリングの装着忘れや、誤装着を防止することができる。 On the other hand, it is conceivable that an annular notch is formed on the side of the packing opposite to the fluid to be sealed and on the inner peripheral surface, and a backup ring is attached to the notch. In this case, the packing and the backup ring are integrated and can be handled as one component. Therefore, it is possible to prevent forgetting to attach the backup ring or erroneous installation.

　しかしながら、バックアップリングは、パッキンに比べて剛性が高いため、パッキンとバックアップリングとを一体化させた密封装置を、ハウジングに設けられた環状溝に装着させる際の作業が困難になるといった問題がある。 However, since the backup ring has higher rigidity than the packing, there is a problem that it becomes difficult to mount a sealing device in which the packing and the backup ring are integrated in an annular groove provided in the housing. .

特許第５０９３７４３号公報Japanese Patent No. 5093743

　本発明の目的は、ハウジングに設けられた環状溝への装着作業性の向上を図った密封装置を提供することにある。 An object of the present invention is to provide a sealing device that improves the workability of mounting in an annular groove provided in a housing.

　本発明は、上記課題を解決するために以下の手段を採用した。 The present invention employs the following means in order to solve the above problems.

　すなわち、本発明の密封装置は、
　軸とハウジングとの間の環状隙間を封止する密封装置において、
　前記ハウジングに形成された軸孔の内周面に設けられた環状溝内に装着され、該環状溝の溝底面に密着し、かつ前記軸の外周面に摺動自在に設けられる弾性体製のパッキンと、
　前記パッキンにおける密封対象流体側とは反対側かつ内周面側に形成された環状の切り欠き部に設けられ、前記パッキンの一部が前記軸とハウジングとの間の隙間にはみ出してしまうことを抑制するバックアップリングと、
　を備える密封装置であって、
　前記バックアップリングは、
　前記パッキンよりも剛性が高く、かつ外周面側が前記環状の切り欠き部に固定される複数の分割体により構成されると共に、
　これら複数の分割体は、隣り合う分割体同士は固定されておらず、かつ隣り合う分割体同士が全て密着すると円環形状をなすように構成されていることを特徴とする。 That is, the sealing device of the present invention is
In a sealing device for sealing an annular gap between a shaft and a housing,
The elastic body is mounted in an annular groove provided on the inner peripheral surface of the shaft hole formed in the housing, is in close contact with the groove bottom surface of the annular groove, and is slidably provided on the outer peripheral surface of the shaft. Packing,
The packing is provided in an annular notch formed on the side opposite to the fluid to be sealed and on the inner peripheral surface side, and a part of the packing protrudes into a gap between the shaft and the housing. Suppress the backup ring,
A sealing device comprising:
The backup ring is
The rigidity is higher than that of the packing, and the outer peripheral surface side is constituted by a plurality of divided bodies fixed to the annular notch,
The plurality of divided bodies are characterized in that the adjacent divided bodies are not fixed to each other, and are configured to form an annular shape when all the adjacent divided bodies are in close contact with each other.

　本発明によれば、バックアップリングは、外周面側がパッキンの切り欠き部に固定された複数の分割体により構成されている。そして、これら複数の分割体は、隣り合う分割体同士は固定されておらず、かつ隣り合う分割体同士が全て密着すると円環形状をなすように構成されている。従って、パッキンを、その外周面側から径方向内側に押圧させることで、バックアップリングの一部を簡単に凹ませることができる。つまり、バックアップリングを構成する分割体同士は個々に分かれるため、パッキンを変形させるのに必要な力で、密封装置全体を変形させることができる。従って、ハウジングに設けられた環状溝に、簡単に密封装置を装着させることができる。 According to the present invention, the backup ring is composed of a plurality of divided bodies whose outer peripheral surfaces are fixed to the cutout portions of the packing. The plurality of divided bodies are configured such that adjacent divided bodies are not fixed to each other and form an annular shape when the adjacent divided bodies are all in close contact with each other. Therefore, a part of the backup ring can be easily recessed by pressing the packing radially inward from the outer peripheral surface side. That is, since the divided bodies constituting the backup ring are individually separated, the entire sealing device can be deformed with a force necessary to deform the packing. Therefore, the sealing device can be easily attached to the annular groove provided in the housing.

　また、本発明の他の密封装置は、
　軸とハウジングとの間の環状隙間を封止する密封装置において、
　前記ハウジングに形成された軸孔の内周面に設けられた環状溝内に装着され、該環状溝の溝底面に密着し、かつ前記軸の外周面に摺動自在に設けられる弾性体製のパッキンと、
　前記パッキンにおける密封対象流体側とは反対側かつ内周面側に形成された環状の切り欠き部に設けられ、前記パッキンの一部が前記軸とハウジングとの間の隙間にはみ出してしまうことを抑制するバックアップリングと、
　を備える密封装置であって、
　前記バックアップリングは、
　前記パッキンよりも剛性の高いバックアップリング本体と、
　前記バックアップリング本体の外周面側に設けられる、可撓性を有する環状薄膜部材と、
から構成されており、
　前記バックアップリング本体は、外周面側が前記環状薄膜部材に固定される複数の分割体により構成されると共に、
　これら複数の分割体は、隣り合う分割体同士は固定されておらず、かつ隣り合う分割体同士が全て密着すると円環形状をなすように構成されていることを特徴とする。 In addition, another sealing device of the present invention is
In a sealing device for sealing an annular gap between a shaft and a housing,
The elastic body is mounted in an annular groove provided on the inner peripheral surface of the shaft hole formed in the housing, is in close contact with the groove bottom surface of the annular groove, and is slidably provided on the outer peripheral surface of the shaft. Packing,
The packing is provided in an annular notch formed on the side opposite to the fluid to be sealed and on the inner peripheral surface side, and a part of the packing protrudes into a gap between the shaft and the housing. Suppress the backup ring,
A sealing device comprising:
The backup ring is
A backup ring main body having higher rigidity than the packing;
An annular thin film member having flexibility provided on the outer peripheral surface side of the backup ring body;
Consists of
The backup ring body is composed of a plurality of divided bodies whose outer peripheral surface side is fixed to the annular thin film member,
The plurality of divided bodies are characterized in that the adjacent divided bodies are not fixed to each other, and are configured to form an annular shape when all the adjacent divided bodies are in close contact with each other.

　本発明によれば、バックアップリング単体の状態においては、外周面側から径方向内側に押圧させることで、バックアップリングの一部を簡単に凹ませることができる。そして、そのようにバックアップリングを変形させた状態で、パッキンに設けられた切り欠き部に装着させれば、弱い力でも簡単に装着させることができる。そして、その後に、凹んだ部分を径方向外側に押して元の形状にすることで、円環形状のバックアップリングが、パッキンに設けられた切り欠き部に装着された状態となる。 According to the present invention, in the state of the backup ring alone, a part of the backup ring can be easily recessed by pressing from the outer peripheral surface side inward in the radial direction. And if it attaches to the notch part provided in packing with the backup ring deform | transformed in that way, it can be easily attached even with a weak force. Then, by pushing the recessed portion radially outward to the original shape, the annular backup ring is attached to the notch provided in the packing.

　また、その後、パッキンとバックアップリングとが一体化された密封装置をハウジングに設けられた環状溝に装着する際においても、パッキンを、その外周面側から径方向内側に押圧させることで、バックアップリングの一部を簡単に凹ませることができる。つまり、バックアップリング本体を構成する分割体同士は個々に分かれるため、パッキンを変形させるのに必要な力で、密封装置全体を変形させることができる。従って、ハウジングに設けられた環状溝に、簡単に密封装置を装着させることができる。 After that, when the sealing device in which the packing and the backup ring are integrated is mounted in the annular groove provided in the housing, the backup ring is pressed by pressing the packing radially inward from the outer peripheral surface side. Can be easily recessed. That is, since the divided bodies constituting the backup ring main body are individually separated, the entire sealing device can be deformed with a force necessary to deform the packing. Therefore, the sealing device can be easily attached to the annular groove provided in the housing.

　更に、本発明の場合には、パッキンのみをハウジングに設けられた環状溝に装着させた後に、パッキンの切り欠き部にバックアップリングを装着させることもできる。この場合でも、パッキンを環状溝に装着させる作業、及び、バックアップリングを切り欠き部に装着させる作業は容易である。 Furthermore, in the case of the present invention, the backup ring can be attached to the notch of the packing after only the packing is attached to the annular groove provided in the housing. Even in this case, the operation of attaching the packing to the annular groove and the operation of attaching the backup ring to the notch are easy.

　以上説明したように、本発明によれば、ハウジングに設けられた環状溝への密封装置の装着作業性の向上を図ることができる。 As described above, according to the present invention, it is possible to improve the workability of attaching the sealing device to the annular groove provided in the housing.

図１は本発明の実施例１に係る密封装置を用いた密封構造の模式的断面図である。FIG. 1 is a schematic cross-sectional view of a sealing structure using a sealing device according to Embodiment 1 of the present invention. 図２は本発明の実施例１に係る密封装置の背面図である。FIG. 2 is a rear view of the sealing device according to the first embodiment of the present invention. 図３は本発明の実施例１に係る密封装置の模式的断面図である。FIG. 3 is a schematic cross-sectional view of the sealing device according to Embodiment 1 of the present invention. 図４は本発明の実施例１に係る密封装置の一部拡大図である。FIG. 4 is a partially enlarged view of the sealing device according to Embodiment 1 of the present invention. 図５は本発明の実施例１に係る密封装置を環状溝に装着する際の様子を示す概略図である。FIG. 5 is a schematic view showing a state when the sealing device according to the first embodiment of the present invention is mounted in the annular groove. 図６は本発明の実施例２に係る密封装置を用いた密封構造の模式的断面図である。FIG. 6 is a schematic cross-sectional view of a sealing structure using a sealing device according to Embodiment 2 of the present invention. 図７は本発明の実施例２に係る密封装置の背面図である。FIG. 7 is a rear view of the sealing device according to the second embodiment of the present invention. 図８は本発明の実施例２に係る密封装置の模式的断面図である。FIG. 8 is a schematic cross-sectional view of a sealing device according to Embodiment 2 of the present invention. 図９は本発明の実施例２係るバックアップリングの背面図である。FIG. 9 is a rear view of the backup ring according to the second embodiment of the present invention. 図１０は本発明の実施例２に係るバックアップリングの一部拡大図である。FIG. 10 is a partially enlarged view of the backup ring according to the second embodiment of the present invention.

　以下に図面を参照して、この発明を実施するための形態を、実施例に基づいて例示的に詳しく説明する。ただし、この実施例に記載されている構成部品の寸法、材質、形状、その相対配置などは、特に特定的な記載がない限りは、この発明の範囲をそれらのみに限定する趣旨のものではない。 DETAILED DESCRIPTION Hereinafter, embodiments for carrying out the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

　（実施例１）
　図１～図５を参照して、本発明の実施例に係る密封装置について説明する。図１は本発明の実施例１に係る密封装置を用いた密封構造の模式的断面図である。図２は本発明の実施例１に係る密封装置の背面図である。図３は本発明の実施例１に係る密封装置の模式的断面図であり、図２中のＡＡ断面図である。図４は本発明の実施例１に係る密封装置の一部拡大図であり、密封装置の一部を変形させた状態を示している。図５は本発明の実施例１に係る密封装置を環状溝に装着する際の様子を示す概略図である。 (Example 1)
A sealing apparatus according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic cross-sectional view of a sealing structure using a sealing device according to Embodiment 1 of the present invention. FIG. 2 is a rear view of the sealing device according to the first embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of the sealing device according to the first embodiment of the present invention, and is a cross-sectional view taken along AA in FIG. FIG. 4 is a partially enlarged view of the sealing device according to the first embodiment of the present invention, and shows a state in which a part of the sealing device is deformed. FIG. 5 is a schematic view showing a state when the sealing device according to the first embodiment of the present invention is mounted in the annular groove.

　＜密封構造＞
　図１を参照して、本実施例に係る密封装置１００を用いた密封構造について説明する。本実施例に係る密封装置１００は、相対的に往復移動する軸２００とハウジング３００との間の環状隙間を封止する役割を担っている。図１中、密封装置１００を介して右側が、密封対象流体が封止される側である。説明の便宜上、図１中、密封装置１００を介して右側を密封対象流体側（Ｈ）と称し、左側を密封対象流体側（Ｈ）とは反対側（Ｌ）と称する。また、密封装置１００は、ハウジング３００に形成された軸孔の内周面に設けられた環状溝３１０内に装着される。 <Sealing structure>
With reference to FIG. 1, the sealing structure using the sealing device 100 which concerns on a present Example is demonstrated. The sealing device 100 according to the present embodiment plays a role of sealing an annular gap between the shaft 200 and the housing 300 that reciprocally move relative to each other. In FIG. 1, the right side through the sealing device 100 is the side on which the fluid to be sealed is sealed. For convenience of explanation, in FIG. 1, the right side is referred to as a sealing target fluid side (H) through the sealing device 100, and the left side is referred to as a side (L) opposite to the sealing target fluid side (H). The sealing device 100 is mounted in an annular groove 310 provided on the inner peripheral surface of a shaft hole formed in the housing 300.

　そして、密封装置１００は、ウレタンやゴムなどの弾性体製のパッキン１１０と、バックアップリング１２０ａとから構成される。パッキン１１０は、環状溝３１０の溝底面に密着し、かつ軸２００の外周面に摺動自在に設けられる。また、バックアップリング１２０ａは、パッキン１１０における密封対象流体側（Ｈ）とは反対側（Ｌ）かつ内周面側に形成された環状の切り欠き部１１４に設けられる。バックアップリング１２０ａは、パッキン１１０の一部が軸２００とハウジング３００との間の隙間にはみ出してしまうことを抑制する役割を担っている。 The sealing device 100 includes a packing 110 made of an elastic material such as urethane or rubber, and a backup ring 120a. The packing 110 is provided in close contact with the bottom surface of the annular groove 310 and is slidable on the outer peripheral surface of the shaft 200. Further, the backup ring 120a is provided in an annular notch 114 formed on the packing 110 on the side (L) opposite to the sealing target fluid side (H) and on the inner peripheral surface side. The backup ring 120 a plays a role of suppressing a part of the packing 110 from protruding into the gap between the shaft 200 and the housing 300.

　＜密封装置＞
　密封装置１００について、より詳細に説明する。上記の通り、密封装置１００は、パッキン１１０とバックアップリング１２０ａとから構成される。パッキン１１０は、環状の胴体部（腰部）１１１と、胴体部１１１から密封対象流体側（Ｈ）かつ径方向外側に向かって伸びる外周リップ１１２と、胴体部１１１から密封対象流体側（Ｈ）かつ径方向内側に向かって伸びる内周リップ１１３とを備えている。外周リップ１１２は、環状溝３１０の溝底面に密着する。また、内周リップ１１３は、軸２００の外周面に摺動自在に設けられる。また、上記の通り、パッキン１１０には、密封対象流体側（Ｈ）とは反対側（Ｌ）かつ内周面側に、環状の切り欠き部１１４が設けられている。 <Sealing device>
The sealing device 100 will be described in more detail. As described above, the sealing device 100 includes the packing 110 and the backup ring 120a. The packing 110 includes an annular body part (waist part) 111, an outer peripheral lip 112 extending from the body part 111 toward the sealing target fluid side (H) and radially outward, and from the body part 111 to the sealing target fluid side (H). And an inner peripheral lip 113 extending radially inward. The outer peripheral lip 112 is in close contact with the groove bottom surface of the annular groove 310. The inner peripheral lip 113 is slidably provided on the outer peripheral surface of the shaft 200. As described above, the packing 110 is provided with the annular notch 114 on the side (L) opposite to the fluid to be sealed (H) and on the inner peripheral surface side.

　バックアップリング１２０ａは、パッキン１１０よりも剛性が高く、かつ外周面側が環状の切り欠き部１１４に固定される複数の分割体１２１ａにより構成されている。バックアップリング１２０ａの材料としては、例えば、ナイロン，ＰＴＦＥ，ＰＥＥＫ，ＰＡなどの剛性の高い樹脂などを採用することができる。そして、複数の分割体１２１ａは、隣り合う分割体１２１ａ同士は固定されておらず、かつ隣り合う分割体１２１ａ同士が全て密着すると円環形状をなすように構成されている。なお、複数の分割体１２１ａは、全て同一形状である。分割体１２１ａの個数は、バックアップリング１２０ａの外径等により適宜設定される。例えば、外径が８０ｍｍの場合、３２個の分割体１２１ａを設けるのが望ましい。 The backup ring 120a is composed of a plurality of divided bodies 121a that are higher in rigidity than the packing 110 and whose outer peripheral surface side is fixed to the annular notch 114. As a material of the backup ring 120a, for example, a highly rigid resin such as nylon, PTFE, PEEK, PA, or the like can be used. The plurality of divided bodies 121a are configured such that adjacent divided bodies 121a are not fixed to each other and form an annular shape when the adjacent divided bodies 121a are all in close contact with each other. The plurality of divided bodies 121a have the same shape. The number of the divided bodies 121a is appropriately set depending on the outer diameter of the backup ring 120a. For example, when the outer diameter is 80 mm, it is desirable to provide 32 divided bodies 121a.

　密封装置１００の製造方法について、簡単に説明する。密封装置１００は、二色成形によって、パッキン１１０とバックアップリング１２０ａとが一体になったものを成形することにより得ることができる。また、予め、分割体１２１ａを成形した後に、金型内に複数の分割体１２１ａを組み込んだ状態でパッキン１１０を成形して、それぞれの分割体１２１ａの外周面側とパッキン１１０とを融着させることによっても、密封装置１００を得ることができる。 The manufacturing method of the sealing device 100 will be briefly described. The sealing device 100 can be obtained by molding a combination of the packing 110 and the backup ring 120a by two-color molding. Moreover, after shape | molding the division body 121a previously, the packing 110 is shape | molded in the state which incorporated the some division body 121a in the metal mold | die, and the outer peripheral surface side and packing 110 of each division body 121a are fuse | melted. Also, the sealing device 100 can be obtained.

　＜本実施例に係る密封装置の優れた点＞
　本実施例に係る密封装置１００によれば、バックアップリング１２０ａは、外周面側がパッキン１１０の切り欠き部１１４に固定された複数の分割体１２１ａにより構成されている。そして、これら複数の分割体１２１ａは、隣り合う分割体１２１ａ同士は固定されておらず、かつ隣り合う分割体１２１ａ同士が全て密着すると円環形状をなすように構成されている。従って、パッキン１１０を、その外周面側から径方向内側に押圧させることで、バックアップリング１２０ａの一部を簡単に凹ませることができる。つまり、図４に示すように、パッキン１１０の一部を外周面側から径方向内側に押圧すると（図中、矢印Ｐ参照）、バックアップリング１２０ａを構成する分割体１２１ａ同士は個々に分かれるため、パッキン１１０を変形させるのに必要な力で、密封装置１００全体を変形させることができる。従って、ハウジング３００に設けられた環状溝３１０に、簡単に密封装置１００を装着させることができる。図５は、環状溝３１０に密封装置１００を装着させる様子を示したものである。図示のように、密封装置１００をハート形状に変形させた状態で、環状溝３１０に装着し、その後、密封装置１００の凹ませた部分を径方向外側に押圧する（図中、矢印Ｑ参照）ことで、密封装置１００は元の形状に戻る。これにより、環状溝３１０内に密封装置１００を装着させることができる。なお、図５においては、密封装置１００全体の形状を黒に塗り潰した状態で示している。また、図５においては、環状溝３１０のうち溝底面のみを示している。環状溝３１０に密封装置１００が装着されると、パッキン１１０が径方向外側から内側に向かって押圧される状態になり、バックアップリング１２０ａには、外周面が締め付けられる力が作用する。これにより、隣り合う分割体１２１ａ同士は互いに押し合うような状態となり、バックアップリング１２０ａ全体で十分な剛性が得られるため、バックアップリング１２０ａとしての機能が損なわれることはない。 <Excellent point of sealing device according to this embodiment>
According to the sealing device 100 according to the present embodiment, the backup ring 120 a is configured by a plurality of divided bodies 121 a whose outer peripheral surface side is fixed to the notch 114 of the packing 110. The plurality of divided bodies 121a are configured such that adjacent divided bodies 121a are not fixed to each other, and form an annular shape when the adjacent divided bodies 121a are all in close contact with each other. Therefore, a part of the backup ring 120a can be easily recessed by pressing the packing 110 radially inward from the outer peripheral surface side. That is, as shown in FIG. 4, when a part of the packing 110 is pressed radially inward from the outer peripheral surface side (see arrow P in the figure), the divided bodies 121a constituting the backup ring 120a are individually separated, The entire sealing device 100 can be deformed with a force required to deform the packing 110. Therefore, the sealing device 100 can be easily attached to the annular groove 310 provided in the housing 300. FIG. 5 shows a state in which the sealing device 100 is attached to the annular groove 310. As shown in the figure, the sealing device 100 is deformed into a heart shape and mounted in the annular groove 310, and then the recessed portion of the sealing device 100 is pressed radially outward (see arrow Q in the figure). As a result, the sealing device 100 returns to its original shape. Thereby, the sealing device 100 can be mounted in the annular groove 310. In FIG. 5, the entire shape of the sealing device 100 is shown in black. In FIG. 5, only the groove bottom surface of the annular groove 310 is shown. When the sealing device 100 is mounted in the annular groove 310, the packing 110 is pressed from the radially outer side to the inner side, and a force that tightens the outer peripheral surface acts on the backup ring 120a. Accordingly, the adjacent divided bodies 121a are pressed against each other, and sufficient rigidity is obtained in the entire backup ring 120a, so that the function as the backup ring 120a is not impaired.

　（実施例２）
　図６～図１０を参照して、本発明の実施例２に係る密封装置について説明する。図６は本発明の実施例２に係る密封装置を用いた密封構造の模式的断面図である。図７は本発明の実施例２に係る密封装置の背面図である。図８は本発明の実施例２に係る密封装置の模式的断面図であり、図７中のＢＢ断面図である。図９は本発明の実施例２係るバックアップリングの背面図である。図１０は本発明の実施例２に係るバックアップリングの一部拡大図である。 (Example 2)
A sealing device according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a schematic cross-sectional view of a sealing structure using a sealing device according to Embodiment 2 of the present invention. FIG. 7 is a rear view of the sealing device according to the second embodiment of the present invention. FIG. 8 is a schematic cross-sectional view of the sealing device according to the second embodiment of the present invention, and is a BB cross-sectional view in FIG. FIG. 9 is a rear view of the backup ring according to the second embodiment of the present invention. FIG. 10 is a partially enlarged view of the backup ring according to the second embodiment of the present invention.

　＜密封構造＞
　図６を参照して、本実施例に係る密封装置１００を用いた密封構造について説明する。本実施例に係る密封装置１００は、相対的に往復移動する軸２００とハウジング３００との間の環状隙間を封止する役割を担っている。図６中、密封装置１００を介して右側が、密封対象流体が封止される側である。説明の便宜上、図６中、密封装置１００を介して右側を密封対象流体側（Ｈ）と称し、左側を密封対象流体側（Ｈ）とは反対側（Ｌ）と称する。また、密封装置１００は、ハウジング３００に形成された軸孔の内周面に設けられた環状溝３１０内に装着される。 <Sealing structure>
With reference to FIG. 6, the sealing structure using the sealing device 100 which concerns on a present Example is demonstrated. The sealing device 100 according to the present embodiment plays a role of sealing an annular gap between the shaft 200 and the housing 300 that reciprocally move relative to each other. In FIG. 6, the right side through the sealing device 100 is the side on which the fluid to be sealed is sealed. For convenience of explanation, in FIG. 6, the right side is referred to as a sealing target fluid side (H) through the sealing device 100, and the left side is referred to as a side (L) opposite to the sealing target fluid side (H). The sealing device 100 is mounted in an annular groove 310 provided on the inner peripheral surface of a shaft hole formed in the housing 300.

　そして、密封装置１００は、ウレタンやゴムなどの弾性体製のパッキン１１０と、バックアップリング１２０ｂとから構成される。パッキン１１０は、環状溝３１０の溝底面に密着し、かつ軸２００の外周面に摺動自在に設けられる。また、バックアップリング１２０ｂは、パッキン１１０における密封対象流体側（Ｈ）とは反対側（Ｌ）かつ内周面側に形成された環状の切り欠き部１１４に設けられる。バックアップリング１２０ｂは、パッキン１１０の一部が軸２００とハウジング３００との間の隙間にはみ出してしまうことを抑制する役割を担っている。 The sealing device 100 includes a packing 110 made of an elastic material such as urethane or rubber, and a backup ring 120b. The packing 110 is provided in close contact with the bottom surface of the annular groove 310 and is slidable on the outer peripheral surface of the shaft 200. Further, the backup ring 120b is provided in an annular notch 114 formed on the packing 110 on the side (L) opposite to the sealing target fluid side (H) and on the inner peripheral surface side. The backup ring 120 b plays a role of suppressing a part of the packing 110 from protruding into the gap between the shaft 200 and the housing 300.

　＜密封装置＞
　密封装置１００について、より詳細に説明する。上記の通り、密封装置１００は、パッキン１１０とバックアップリング１２０ｂとから構成される。パッキン１１０の構成については、上記実施例１に示したパッキン１１０と同一であるので、同一の構成部分については同一の符号を付して、その説明は省略する。 <Sealing device>
The sealing device 100 will be described in more detail. As described above, the sealing device 100 includes the packing 110 and the backup ring 120b. Since the configuration of the packing 110 is the same as that of the packing 110 shown in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

　バックアップリング１２０ｂは、パッキン１１０よりも剛性の高いバックアップリング本体１２１ｂと、バックアップリング本体１２１ｂの外周面側に設けられる環状薄膜部材１２２とから構成されている。バックアップリング本体１２１ｂは、ナイロン，ＰＴＦＥ，ＰＥＥＫ，ＰＡなどの剛性の高い樹脂などにより構成される。また、バックアップリング本体１２１ｂは、外周面側が環状薄膜部材１２２に固定される複数の分割体１２１ｃにより構成される。そして、複数の分割体１２１ｃは、隣り合う分割体１２１ｃ同士は固定されておらず、かつ隣り合う分割体１２１ｃ同士が全て密着すると円環形状をなすように構成されている。 The backup ring 120b is composed of a backup ring main body 121b having higher rigidity than the packing 110, and an annular thin film member 122 provided on the outer peripheral surface side of the backup ring main body 121b. The backup ring body 121b is made of a highly rigid resin such as nylon, PTFE, PEEK, or PA. Further, the backup ring main body 121b includes a plurality of divided bodies 121c whose outer peripheral surface side is fixed to the annular thin film member 122. The plurality of divided bodies 121c are configured such that the adjacent divided bodies 121c are not fixed to each other, and form an annular shape when all the adjacent divided bodies 121c are in close contact with each other.

　バックアップリング１２０ｂの製造方法について、簡単に説明する。まず、複数の分割体１２１ｃからなるバックアップリング本体１２１ｂが射出成形により成形される。その後、射出成形により、環状薄膜部材１２２が成形される。この環状薄膜部材１２２は、ウレタンなどの材料により構成され、可撓性を有している。また、複数の分割体１２１ｃは、環状薄膜部材１２２に対して融着可能な材料（ナイロンなど）により構成される。以上のように、２色成形によって、複数の分割体１２１ｃが、環状薄膜部材１２２の内周面に融着により固定された状態となり、バックアップリング１２０ｂが得られる。ただし、分割体１２１ｃを別に成形し、複数の分割体１２１ｃを環状薄膜部材１２２の内周面に接着させることによっても、バックアップリング１２０ｂが得られる。なお、複数の分割体１２１ｃは、全て同一形状である。分割体１２１ｃの個数は、バックアップリング１２０ｂの外径等により適宜設定される。例えば、外径が８０ｍｍの場合、３２個の分割体１２１ｃを設けるのが望ましい。 The manufacturing method of the backup ring 120b will be briefly described. First, a backup ring main body 121b composed of a plurality of divided bodies 121c is formed by injection molding. Thereafter, the annular thin film member 122 is formed by injection molding. The annular thin film member 122 is made of a material such as urethane and has flexibility. The plurality of divided bodies 121c are made of a material (such as nylon) that can be fused to the annular thin film member 122. As described above, by the two-color molding, the plurality of divided bodies 121c are fixed to the inner peripheral surface of the annular thin film member 122 by fusion, and the backup ring 120b is obtained. However, the backup ring 120 b can also be obtained by separately molding the divided body 121 c and bonding the plurality of divided bodies 121 c to the inner peripheral surface of the annular thin film member 122. The plurality of divided bodies 121c have the same shape. The number of the divided bodies 121c is appropriately set depending on the outer diameter of the backup ring 120b. For example, when the outer diameter is 80 mm, it is desirable to provide 32 divided bodies 121c.

　＜密封装置の組み立て手順＞
　本実施例の場合には、バックアップリング１２０ｂをパッキン１１０の切り欠き部１１４に装着した後に、これらが一体化された密封装置１００をハウジング３００の環状溝３１０に装着することができる。なお、この場合、パッキン１１０とバックアップリング１２０ｂとを接合（接着）させてもよいが、必ずしも接合等により固定させる必要はない。また、パッキン１１０をハウジング３００の環状溝３１０に装着させた後に、バックアップリング１２０ｂをパッキン１１０の切り欠き部１１４に装着させることも可能である。 <Assembly procedure of sealing device>
In the case of the present embodiment, after the backup ring 120 b is attached to the notch 114 of the packing 110, the sealing device 100 in which these are integrated can be attached to the annular groove 310 of the housing 300. In this case, the packing 110 and the backup ring 120b may be joined (adhered), but it is not necessarily fixed by joining or the like. It is also possible to attach the backup ring 120 b to the notch 114 of the packing 110 after the packing 110 is attached to the annular groove 310 of the housing 300.

　＜本実施例に係る密封装置の優れた点＞
　本実施例に係る密封装置１００によれば、バックアップリング１２０ｂ単体の状態においては、外周面側から径方向内側に押圧させることで、バックアップリング１２０ｂの一部を簡単に凹ませることができる。つまり、図１０に示すように、バックアップリング１２０ｂの一部を外周面側から径方向内側に押圧すると（図中、矢印Ｐ参照）、バックアップリング本体１２１ｂを構成する分割体１２１ｃ同士は個々に分かれるため、バックアップリング１２０ｂの一部を簡単に凹ませることができる。 <Excellent point of sealing device according to this embodiment>
According to the sealing device 100 according to the present embodiment, in the state of the backup ring 120b alone, a part of the backup ring 120b can be easily recessed by being pressed radially inward from the outer peripheral surface side. That is, as shown in FIG. 10, when a part of the backup ring 120b is pressed radially inward from the outer peripheral surface side (see arrow P in the figure), the divided bodies 121c constituting the backup ring main body 121b are individually separated. Therefore, a part of the backup ring 120b can be easily recessed.

　そして、そのようにバックアップリング１２０ｂを変形させた状態で、パッキン１１０に設けられた切り欠き部１１４に装着させれば、弱い力でも簡単に装着させることができる。つまり、上記実施例１において、密封装置１００全体をハート形状に変形させた状態で環状溝３１０に装着させる場合と同様に、バックアップリング１２０ｂをハート形状に変形させた状態で切り欠き部１１４に簡単に装着させることができる。そして、その後に、凹んだ部分を径方向外側に押して元の形状にすることで、円環形状のバックアップリング１２０ｂが、パッキン１１０に設けられた切り欠き部１１４に装着された状態となる。 Then, if the backup ring 120b is deformed as described above and attached to the notch 114 provided in the packing 110, it can be easily attached even with a weak force. That is, in the first embodiment, similarly to the case where the entire sealing device 100 is deformed into a heart shape and attached to the annular groove 310, the backup ring 120b is easily deformed into the notch 114 with the heart shape deformed. Can be attached. Thereafter, the recessed portion is pushed radially outward to the original shape, so that the annular backup ring 120b is attached to the notch 114 provided in the packing 110.

　また、その後、パッキン１１０とバックアップリング１２０ｂとが一体化された密封装置１００をハウジング３００に設けられた環状溝３１０に装着する際においても、パッキン１１０を、その外周面側から径方向内側に押圧させることで、バックアップリング１２０ｂの一部を簡単に凹ませることができる。つまり、バックアップリング１２０ｂを構成する分割体１２１ｃ同士は個々に分かれるため、パッキン１１０を変形させるのに必要な力で、密封装置１００全体を変形させることができる。従って、ハウジング３００に設けられた環状溝３１０に、簡単に密封装置１００を装着させることができる。 After that, when the sealing device 100 in which the packing 110 and the backup ring 120b are integrated is mounted in the annular groove 310 provided in the housing 300, the packing 110 is pressed radially inward from the outer peripheral surface side. By doing so, a part of the backup ring 120b can be easily recessed. That is, since the divided bodies 121c constituting the backup ring 120b are individually separated, the entire sealing device 100 can be deformed by a force necessary to deform the packing 110. Therefore, the sealing device 100 can be easily attached to the annular groove 310 provided in the housing 300.

　更に、本実施例に係る密封装置１００の場合には、パッキン１１０のみをハウジング３００に設けられた環状溝３１０に装着させた後に、パッキン１１０の切り欠き部１１４にバックアップリング１２０ｂを装着させることもできる。この場合でも、パッキン１１０を環状溝３１０に装着させる作業、及び、バックアップリング１２０ｂを切り欠き部１１４に装着させる作業は容易である。環状溝３１０に密封装置１００が装着されることで、バックアップリング１２０ｂ全体で十分な剛性が得られて、バックアップリング１２０ｂとしての機能が損なわれることがないことについては、上記実施例１の場合と同様である。 Furthermore, in the case of the sealing device 100 according to the present embodiment, the backup ring 120b may be attached to the notch 114 of the packing 110 after only the packing 110 is attached to the annular groove 310 provided in the housing 300. it can. Even in this case, the operation of attaching the packing 110 to the annular groove 310 and the operation of attaching the backup ring 120b to the notch 114 are easy. By mounting the sealing device 100 in the annular groove 310, sufficient rigidity is obtained in the entire backup ring 120b, and the function as the backup ring 120b is not impaired. It is the same.

　１００　密封装置
　１１０　パッキン
　１１１　胴体部
　１１２　外周リップ
　１１３　内周リップ
　１１４　切り欠き部
　１２０ａ，１２０ｂ　バックアップリング
　１２１ａ　分割体
　１２１ｂ　バックアップリング本体
　１２１ｃ　分割体
　１２２　環状薄膜部材
　２００　軸
　３００　ハウジング
　３１０　環状溝 DESCRIPTION OF SYMBOLS 100 Sealing device 110 Packing 111 Body part 112 Outer peripheral lip 113 Inner peripheral lip 114 Notch part 120a, 120b Backup ring 121a Divided body 121b Backup ring main body 121c Divided body 122 Annular thin film member 200 Shaft 300 Housing 310 Annular groove

Claims (2)

　軸とハウジングとの間の環状隙間を封止する密封装置において、
　前記ハウジングに形成された軸孔の内周面に設けられた環状溝内に装着され、該環状溝の溝底面に密着し、かつ前記軸の外周面に摺動自在に設けられる弾性体製のパッキンと、
　前記パッキンにおける密封対象流体側とは反対側かつ内周面側に形成された環状の切り欠き部に設けられ、前記パッキンの一部が前記軸とハウジングとの間の隙間にはみ出してしまうことを抑制するバックアップリングと、
　を備える密封装置であって、
　前記バックアップリングは、
　前記パッキンよりも剛性が高く、かつ外周面側が前記環状の切り欠き部に固定される複数の分割体により構成されると共に、
　これら複数の分割体は、隣り合う分割体同士は固定されておらず、かつ隣り合う分割体同士が全て密着すると円環形状をなすように構成されていることを特徴とする密封装置。 In a sealing device for sealing an annular gap between a shaft and a housing,
The elastic body is mounted in an annular groove provided on the inner peripheral surface of the shaft hole formed in the housing, is in close contact with the groove bottom surface of the annular groove, and is slidably provided on the outer peripheral surface of the shaft. Packing,
The packing is provided in an annular notch formed on the side opposite to the fluid to be sealed and on the inner peripheral surface side, and a part of the packing protrudes into a gap between the shaft and the housing. Suppress the backup ring,
A sealing device comprising:
The backup ring is
The rigidity is higher than that of the packing, and the outer peripheral surface side is constituted by a plurality of divided bodies fixed to the annular notch,
The plurality of divided bodies are configured such that adjacent divided bodies are not fixed to each other, and are configured so as to form an annular shape when all the adjacent divided bodies are in close contact with each other. 　軸とハウジングとの間の環状隙間を封止する密封装置において、
　前記ハウジングに形成された軸孔の内周面に設けられた環状溝内に装着され、該環状溝の溝底面に密着し、かつ前記軸の外周面に摺動自在に設けられる弾性体製のパッキンと、
　前記パッキンにおける密封対象流体側とは反対側かつ内周面側に形成された環状の切り欠き部に設けられ、前記パッキンの一部が前記軸とハウジングとの間の隙間にはみ出してしまうことを抑制するバックアップリングと、
　を備える密封装置であって、
　前記バックアップリングは、
　前記パッキンよりも剛性の高いバックアップリング本体と、
　前記バックアップリング本体の外周面側に設けられる、可撓性を有する環状薄膜部材と、
から構成されており、
　前記バックアップリング本体は、外周面側が前記環状薄膜部材に固定される複数の分割体により構成されると共に、
　これら複数の分割体は、隣り合う分割体同士は固定されておらず、かつ隣り合う分割体同士が全て密着すると円環形状をなすように構成されていることを特徴とする密封装置。
  In a sealing device for sealing an annular gap between a shaft and a housing,
The elastic body is mounted in an annular groove provided on the inner peripheral surface of the shaft hole formed in the housing, is in close contact with the groove bottom surface of the annular groove, and is slidably provided on the outer peripheral surface of the shaft. Packing,
The packing is provided in an annular notch formed on the side opposite to the fluid to be sealed and on the inner peripheral surface side, and a part of the packing protrudes into a gap between the shaft and the housing. Suppress the backup ring,
A sealing device comprising:
The backup ring is
A backup ring main body having higher rigidity than the packing;
An annular thin film member having flexibility provided on the outer peripheral surface side of the backup ring body;
Consists of
The backup ring body is composed of a plurality of divided bodies whose outer peripheral surface side is fixed to the annular thin film member,
The plurality of divided bodies are configured such that adjacent divided bodies are not fixed to each other, and are configured so as to form an annular shape when all the adjacent divided bodies are in close contact with each other.
PCT/JP2019/008386 2018-03-20 2019-03-04 Sealing device Ceased WO2019181461A1 (en)

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