JP6132146B2 - Sealing device - Google Patents

Sealing device Download PDF

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JP6132146B2
JP6132146B2 JP2013110721A JP2013110721A JP6132146B2 JP 6132146 B2 JP6132146 B2 JP 6132146B2 JP 2013110721 A JP2013110721 A JP 2013110721A JP 2013110721 A JP2013110721 A JP 2013110721A JP 6132146 B2 JP6132146 B2 JP 6132146B2
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sealing device
seal member
outer peripheral
rubber
housing
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JP2014228122A (en
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岳洋 中川
岳洋 中川
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Nok Corp
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Nok Corp
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Description

本発明は軸周を密封する密封装置に関するものであって、特に、ゴム材料を劣化させる強酸、強アルカリ成分を含む流体をシールする密封装置に関する。   The present invention relates to a sealing device that seals a shaft periphery, and more particularly, to a sealing device that seals a fluid containing a strong acid or a strong alkali component that deteriorates a rubber material.

ハウジングとこのハウジングを貫通して伸びる軸との隙間を通じて流体が漏出することのないように、両者間には密封装置を設ける必要がある。   In order to prevent fluid from leaking through the gap between the housing and the shaft extending through the housing, it is necessary to provide a sealing device between them.

特に、流路内は排ガスによる２００℃の高温で、かつ強酸性の凝縮水を生じる環境になることから、密封装置のシールリップには、フッ素樹脂材であるＰＴＦＥ（ポリテトラフルオロエチレン）が用いられている。
また、密封装置の外周面が金属材製である為、密封装置をハウジングに装着する際に生ずる、ハウジングの損傷に配慮する必要が有った。 In particular, since the inside of the flow path becomes an environment where high-temperature exhaust gas is generated at 200 ° C. and strongly acidic condensed water is generated, PTFE (polytetrafluoroethylene), which is a fluororesin material, is used for the seal lip of the sealing device. It has been.
Moreover, since the outer peripheral surface of the sealing device is made of a metal material, it is necessary to consider the damage to the housing that occurs when the sealing device is mounted on the housing.

この様な環境に使用する密封装置としては、図２に示す密封装置が知られている。
図２に示す密封装置は、ＳＵＳ等の金属材製である断面略Ｌ字形状の外周側保持環５５０と断面略Ｌ字形状の内周側保持環５６０との間で、円盤状に形成されたフッ素樹脂材製シール部材４００の外周側部を挟持する構成となっている。（特許文献１）
そして、外周側保持環５５０の軸方向端部（図上右端）を内周側保持環５６０にカシメ固定する事により、外周側保持環５５０と内周側保持環５６０との一体化を図っている。
更に、この内部側（強酸性の凝縮水が存在する側）に、この種フッ素樹脂材製シール部材４００を配置すると共に、その外部側（図上左側）にゴム状弾性材製シール部材３００を配置する構成としている。 As a sealing device used in such an environment, a sealing device shown in FIG. 2 is known.
The sealing device shown in FIG. 2 is formed in a disk shape between an outer peripheral holding ring 550 having a substantially L-shaped cross section made of a metal material such as SUS and an inner peripheral holding ring 560 having an approximately L-shaped cross section. Further, the outer peripheral side portion of the fluororesin seal member 400 is sandwiched. (Patent Document 1)
Then, by fixing the axial end (right end in the figure) of the outer peripheral holding ring 550 to the inner peripheral holding ring 560, the outer peripheral holding ring 550 and the inner peripheral holding ring 560 are integrated. Yes.
Furthermore, this kind of fluororesin material sealing member 400 is disposed on the inner side (the side where strong acidic condensate exists), and a rubber-like elastic material sealing member 300 is disposed on the outer side (the left side in the figure). The configuration is arranged.

しかし、フッ素樹脂材製シール部材４００のカシメ部は、表面状態が荒れた状態とならざるを得ず、このままの状態でハウジング１００に嵌合装着した場合には、ハウジング１００が損傷を受け、外周側保持環５５０とハウジング１００の嵌合内周面との間から流体が漏洩する問題を惹起した。   However, the crimped portion of the fluororesin seal member 400 is inevitably in a rough surface state. When the fitting state is attached to the housing 100 in this state, the housing 100 is damaged and the outer periphery is damaged. The problem of fluid leakage from between the side holding ring 550 and the fitting inner peripheral surface of the housing 100 was caused.

この為、図２に示す様に、フッ素樹脂材製シール部材４００が嵌合装着されるハウジング１００の嵌合内周面の径を小さく、ゴム状弾性材製シール部材３００が嵌合装着されるハウジング１００の嵌合内周面の径をより大きい２段形状にする必要が有った。   For this reason, as shown in FIG. 2, the diameter of the fitting inner peripheral surface of the housing 100 into which the fluororesin seal member 400 is fitted and mounted is reduced, and the rubber-like elastic seal member 300 is fitted and mounted. It was necessary to make the diameter of the fitting inner peripheral surface of the housing 100 into a larger two-stage shape.

また、フッ素樹脂材製シール部材４００は、ＳＵＳ等の金属材製である断面略Ｌ字形状の外周側保持環５５０と断面略Ｌ字形状の内周側保持環５６０との間でその外周側部を挟持する構成となっている為、外周側保持環５５０と内周側保持環５６０を準備する必要が有るばかりでなく、外周側保持環５５０の外周を切削加工する必要がある為、製造加工費が嵩む問題を惹起した。   The sealing member 400 made of a fluororesin material has an outer peripheral side between an outer peripheral holding ring 550 having a substantially L-shaped cross section made of a metal material such as SUS and an inner peripheral holding ring 560 having an approximately L-shaped cross section. Since the structure is such that the outer peripheral side holding ring 550 and the inner peripheral side holding ring 560 need to be prepared, it is necessary to cut the outer periphery of the outer peripheral side holding ring 550. This caused a problem that processing costs increased.

更に、フッ素樹脂材製シール部材４００とゴム状弾性材製シール部材３００を別々に、ハウジング１００の嵌合内周面圧入する必要がある為、組み付け工数が多くなる問題を招来した。   Further, since the fluororesin seal member 400 and the rubber-like elastic seal member 300 need to be separately press-fitted into the fitting inner peripheral surface of the housing 100, there has been a problem that the number of assembling steps increases.

特開２０１０−６５７２９号公報JP 2010-65729 A

そこで、本発明が前述の状況に鑑み、密封装置の製造コストが安価で、ハウジングの損傷に配慮する必要が無く、密封性能が良好な密封装置を提供することを目的としている。   Therefore, in view of the above-described situation, the present invention has an object to provide a sealing device that is inexpensive in manufacturing cost, does not need to consider damage to the housing, and has good sealing performance.

上記目的を達成するために本発明にあっては、ハウジングと、前記ハウジングを貫通して伸びる回転軸との間隙をシールする密封装置であって、前記ハウジング側に保持され、円筒状部とフランジ部を備えた金属補強環を有するゴム状弾性材製シール部材と、フッ素樹脂材製シール部材を備えた密封装置において、前記フッ素樹脂材製シール部材の外周保持部を直接前記ゴム状弾性材製シール部材の軸方向端部の周面に嵌着したものであって、前記外周保持部の嵌着は、前記外周保持部に設けた環状溝に前記ゴム状弾性材製シール部材の前記軸方向端部を挿入してなることを特徴とする。 In order to achieve the above object, according to the present invention, there is provided a sealing device for sealing a gap between a housing and a rotary shaft extending through the housing, the cylindrical device and a flange being held on the housing side. In a sealing device provided with a rubber-like elastic material sealing member having a metal reinforcing ring having a portion and a fluororesin material sealing member, the outer peripheral holding portion of the fluororesin material sealing member is directly made of the rubber-like elastic material. The seal member is fitted to the peripheral surface of the axial end portion, and the outer periphery holding portion is fitted into the annular groove provided in the outer periphery holding portion in the axial direction of the rubber-like elastic seal member. It is characterized by inserting an end portion .

本発明は、以下に記載されるような効果を奏する。
請求項１記載の発明の密封装置によれば、フッ素樹脂材製シール部材の外周保持部を直接ゴム状弾性材製シール部材の軸方向端部の周面に嵌着する構成としている為、密封装置の製造コストが安価で、ハウジングの損傷に配慮する必要が無く、密封性能が良好であると共に、フッ素樹脂材製シール部材の外周保持部の嵌着は、外周保持部に設けた環状溝にゴム状弾性材製シール部材の軸方向端部を挿入する構成としている為、フッ素樹脂材製シール部材とゴム状弾性材製シール部材の一体化がより安定する。 The present invention has the following effects.
According to the sealing device of the first aspect of the present invention, since the outer peripheral holding portion of the fluororesin material sealing member is directly fitted to the peripheral surface of the axial end portion of the rubber-like elastic material sealing member, the manufacturing cost of the apparatus is inexpensive, it is not necessary to consider the damage of the housing, the sealing performance is good, fitting the outer peripheral holding portion of the fluorocarbon resin-made sealing member, in an annular groove provided on the outer periphery holding portion Since the end portion in the axial direction of the rubber-like elastic material sealing member is inserted, the integration of the fluororesin material sealing member and the rubber-like elastic material sealing member becomes more stable.

更に、請求項２記載の発明の密封装置によれば、軸方向端部には、金属補強環の円筒状部の内外周面にゴム状弾性材層が存在するする構成としている為、密封装置をハウジングに取り付ける際、このゴム状弾性材層が圧縮変形して緩衝機能を発揮する為、嵌合荷重を低く抑えると共に、フッ素樹脂材製シール部材の損傷を防止出来る。
また、請求項３記載の発明の密封装置によれば、ハウジングの内周面には、金属補強環の円筒状部の外周面とフッ素樹脂材製シール部材の外周保持部の外周面が直接嵌合する構成としている為、密封装置をハウジング側に確実に固定保持出来ると共に、密封装置とハウジング間の良好な密封性能を維持出来る。 Furthermore, according to the sealing device of the invention of claim 2 , since the rubber-like elastic material layer is present on the inner and outer peripheral surfaces of the cylindrical portion of the metal reinforcing ring at the axial end, the sealing device When this is attached to the housing, this rubber-like elastic material layer compresses and deforms to exhibit a buffering function, so that the fitting load can be kept low and damage to the fluororesin seal member can be prevented.
According to the sealing device of the invention of claim 3, the outer peripheral surface of the cylindrical portion of the metal reinforcing ring and the outer peripheral surface of the outer peripheral holding portion of the fluororesin material seal member are directly fitted on the inner peripheral surface of the housing. Since the sealing device is configured so that the sealing device can be securely fixed to the housing side, good sealing performance between the sealing device and the housing can be maintained.

更に、請求項４記載の発明の密封装置によれば、フッ素樹脂材製シール部材の環状シールリップは、外周保持部の軸方向端部よりもゴム状弾性材製シール部材側の内周面に位置する形で形成されている為、回転軸を挿入する際の、フッ素樹脂材製シール部材の環状シールリップの変形を低く抑える事が出来る為、フッ素樹脂材製シール部材の環状シールリップの過度な変形及び損傷を抑止出来る。
Furthermore, according to the sealing device of the invention described in claim 4, the annular seal lip of the fluororesin material seal member is located on the inner peripheral surface on the rubber elastic material seal member side rather than the axial end of the outer periphery holding portion. Because it is formed in a position, the deformation of the annular seal lip of the fluororesin material seal member when inserting the rotary shaft can be kept low, so that the annular seal lip of the fluororesin material seal member is excessive. Deformation and damage can be suppressed.

本発明に係る密封装置の断面図。Sectional drawing of the sealing device which concerns on this invention. 従来技術に係る密封装置の断面図。Sectional drawing of the sealing device which concerns on a prior art.

以下、図１に基づき本発明を実施するための最良の形態について説明する。   Hereinafter, the best mode for carrying out the present invention will be described with reference to FIG.

本発明に係る密封装置は、ハウジング１と、このハウジング１を貫通して伸びる回転軸２との間隙をシールする密封装置であって、ハウジング１側に保持され、円筒状部３１１とフランジ部３１２を備えた金属補強環３１を有するゴム状弾性材製シール部材３と、フッ素樹脂材製シール部材４を備えた基本構成を有している。   The sealing device according to the present invention is a sealing device that seals a gap between the housing 1 and the rotary shaft 2 extending through the housing 1, and is held on the housing 1 side, and has a cylindrical portion 311 and a flange portion 312. It has a basic configuration including a rubber-like elastic seal member 3 having a metal reinforcing ring 31 and a fluororesin seal member 4.

そして、このフッ素樹脂材製シール部材４の外周保持部４１を直接ゴム状弾性材製シール部材３の軸方向端部３２の内周面３２１若しくは外周面３２２に嵌着した特徴を備えている。   The outer peripheral holding portion 41 of the fluororesin material sealing member 4 is directly fitted on the inner peripheral surface 321 or the outer peripheral surface 322 of the axial end portion 32 of the rubber-like elastic material sealing member 3.

このフッ素樹脂材製シール部材４の外周保持部４１の嵌着は、外周保持部４１に設けた、ゴム状弾性材製シール部材３の軸方向端部３２に向かって開口する環状溝４１１に、ゴム状弾性材製シール部材３の軸方向端部３２を挿入する事により達成される。   The fitting of the outer peripheral holding portion 41 of the fluororesin seal member 4 is performed in the annular groove 411 provided in the outer peripheral holding portion 41 and opening toward the end 32 in the axial direction of the rubber elastic seal member 3. This is achieved by inserting the axial end portion 32 of the rubber-like elastic seal member 3.

この様な構成とする事により、フッ素樹脂材製シール部材とゴム状弾性材製シール部材の一体化がより安定する。   By adopting such a configuration, the integration of the fluororesin seal member and the rubber elastic seal member becomes more stable.

しかし、フッ素樹脂材製シール部材４の外周保持部４１の形状は、環状溝４１１を設ける態様のみではなく、ゴム状弾性材製シール部材３の軸方向端部３２の内周面３２１と嵌合する内側円筒状部４１２のみを設ける態様や、ゴム状弾性材製シール部材３の軸方向端部３２の外周面３２２と嵌合する外側円筒状部４１３のみを設ける態様としても良い。   However, the shape of the outer peripheral holding portion 41 of the fluororesin material seal member 4 is not limited to the mode in which the annular groove 411 is provided, but is fitted to the inner peripheral surface 321 of the axial end portion 32 of the rubber elastic material seal member 3. It is good also as an aspect which provides only the outer cylindrical part 413 which fits with the outer peripheral surface 322 of the axial direction edge part 32 of the rubber-like elastic material sealing member 3, or the aspect which provides only the inner cylindrical part 412 to do.

また、ゴム状弾性材製シール部材３の軸方向端部３２には、金属補強環３１の円筒状部３１１の内外周面にゴム状弾性材層３２３、３２４が存在する構成としている。
この様な構成としている為、密封装置をハウジング１に取り付ける際、このゴム状弾性材層３２３、３２４が圧縮変形して緩衝機能を発揮する為、嵌合荷重を低く抑えると共に、フッ素樹脂材製シール部材３の損傷を防止出来る。 In addition, rubber-like elastic material layers 323 and 324 exist on the inner and outer peripheral surfaces of the cylindrical portion 311 of the metal reinforcing ring 31 at the axial end portion 32 of the rubber-like elastic material sealing member 3.
Because of this structure, when the sealing device is attached to the housing 1, the rubber-like elastic material layers 323 and 324 are compressed and deformed to exert a buffer function, so that the fitting load is kept low and the fluororesin material is made. Damage to the seal member 3 can be prevented.

更に、ハウジング１の内周面１１には、金属補強環３１の円筒状部３１１の外周面とフッ素樹脂材製シール部材４の外周保持部４１の外周面が直接嵌合する構成としている。
この様な構成としている為、密封装置をハウジング１側に確実に固定保持出来ると共に、密封装置とハウジング１間の良好な密封性能を維持出来る。 Furthermore, the outer peripheral surface of the cylindrical portion 311 of the metal reinforcing ring 31 and the outer peripheral surface of the outer peripheral holding portion 41 of the fluororesin material seal member 4 are directly fitted to the inner peripheral surface 11 of the housing 1.
With such a configuration, the sealing device can be securely fixed and held on the housing 1 side, and good sealing performance between the sealing device and the housing 1 can be maintained.

更にまた、フッ素樹脂材製シール部材４の環状シールリップ４２は、外周保持部４１の軸方向端部（図上右側端部）よりもゴム状弾性材製シール部材３側（図上左側）の内周面に位置する形で形成されている。
この様な構成としている為、回転軸２を挿入する際の、フッ素樹脂材製シール部材４の環状シールリップ４２の変形を低く抑える事が出来る為、フッ素樹脂材製シール部材４の環状シールリップ４２の過度な変形及び損傷を抑止出来る。 Further, the annular seal lip 42 of the fluororesin material seal member 4 is closer to the rubber-like elastic material seal member 3 side (left side in the drawing) than the axial end portion (right side end in the drawing) of the outer periphery holding portion 41. It is formed in a shape located on the inner peripheral surface.
Since such a configuration is adopted, deformation of the annular seal lip 42 of the fluororesin material seal member 4 when the rotary shaft 2 is inserted can be kept low, so that the annular seal lip of the fluororesin material seal member 4 is reduced. The excessive deformation and damage of 42 can be suppressed.

フッ素樹脂材製シール部材４の材質は、フッ素樹脂材の中で、ＰＴＦＥ（ポリテトラフルオロエチレン）が好適に用いられている。このＰＴＦＥ（ポリテトラフルオロエチレン）の充填材としては、相手部材となる軸１の材質や使用環境条件に応じて、ガラスファイバー、カーボンファイバー、グラファイト粉末、ＭｏＳ２、耐熱性高分子等の単体又はそれらを組み合わせた材料を選択して使用する。   As the material of the fluororesin seal member 4, PTFE (polytetrafluoroethylene) is preferably used among the fluororesins. As a filler of this PTFE (polytetrafluoroethylene), a simple substance such as glass fiber, carbon fiber, graphite powder, MoS2, heat-resistant polymer, or the like, depending on the material of the shaft 1 that is the counterpart member and the use environment conditions Select and use a combination of materials.

フッ素樹脂材製シール部材４の環状シールリップ４２は、回転軸２に挿入する前に、外周保持部４１を治具で保持し、中心部をコーン状の治具で軸方向に癖付け加工しておいても良い。   Before the annular seal lip 42 of the fluororesin seal member 4 is inserted into the rotary shaft 2, the outer peripheral holding portion 41 is held with a jig, and the center portion is brazed in the axial direction with a cone-shaped jig. You can keep it.

金属補強環３１の材質は、耐蝕性の良好なＳＵＳ材が好適に使用されている。   As the material of the metal reinforcing ring 31, a SUS material having good corrosion resistance is preferably used.

この事により、ゴム材料を劣化させる強酸、強アルカリ成分を含む流体をシールする用途に好適に用いられる。   By this, it is used suitably for the use which seals the fluid containing the strong acid and the strong alkali component which degrade a rubber material.

また、フッ素樹脂材製シール部材４の外周保持部４１とゴム状弾性材製シール部材３の軸方向端部３２の嵌合面に接着剤を塗布しておく事により、フッ素樹脂材製シール部材４とゴム状弾性材製シール部材３の一体化がより確実に行える。   Further, by applying an adhesive to the fitting surfaces of the outer periphery holding portion 41 of the fluororesin seal member 4 and the axial end portion 32 of the rubber elastic seal member 3, the fluororesin seal member is applied. 4 and the rubber-like elastic seal member 3 can be more reliably integrated.

また、本発明は上述の考案を実施するための最良の形態に限らず本発明の要旨を逸脱することなくその他種々の構成を採り得ることはもちろんである。   Further, the present invention is not limited to the best mode for carrying out the above-described invention, and various other configurations can be adopted without departing from the gist of the present invention.

ゴム材料を劣化させる強酸、強アルカリ成分を含む流体をシールする用途に使用される密封装置として好適に用いられる。   It is suitably used as a sealing device used for sealing a fluid containing a strong acid or strong alkali component that deteriorates the rubber material.

１ ハウジング
２ 軸
３ ゴム状弾性材製シール部材
４ フッ素樹脂材製シール部材
１１ 内周面
３１ 金属補強環
３２ 軸方向端部
４１ 外周保持部
４２ 環状シールリップ
３１１円筒状部
３１２フランジ部
３２１内周面
３２２外周面
３２３、３２４ゴム状弾性材層
４１１環状溝
４１２内周円筒状部
４１３外周円筒状部 DESCRIPTION OF SYMBOLS 1 Housing 2 Shaft 3 Rubber-like elastic material sealing member 4 Fluororesin sealing member 11 Inner peripheral surface 31 Metal reinforcing ring 32 Axial end portion 41 Outer peripheral holding portion 42 Annular seal lip 311 cylindrical portion 312 flange portion 321 inner periphery Surface 322 outer peripheral surface 323, 324 rubber-like elastic material layer 411 annular groove 412 inner peripheral cylindrical portion 413 outer peripheral cylindrical portion

Claims (4)

ハウジング（１）と、前記ハウジング（１）を貫通して伸びる回転軸（２）との間隙をシールする密封装置であって、前記ハウジング（１）側に保持され、円筒状部（３１１）とフランジ部（３１２）を備えた金属補強環（３１）を有するゴム状弾性材製シール部材（３）と、フッ素樹脂材製シール部材（４）を備えた密封装置において、
前記フッ素樹脂材製シール部材（４）の外周保持部（４１）を直接前記ゴム状弾性材製シール部材（３）の軸方向端部（３２）の周面（３２１）、（３２２）に嵌着したものであって、前記外周保持部（４１）の嵌着は、前記外周保持部（４１）に設けた環状溝（４１１）に前記ゴム状弾性材製シール部材（３）の前記軸方向端部（３２）を挿入してなることを特徴とする密封装置。 A sealing device for sealing a gap between a housing (1) and a rotating shaft (2) extending through the housing (1), the sealing device being held on the housing (1) side, and having a cylindrical portion (311) In a sealing device including a rubber-like elastic seal member (3) having a metal reinforcing ring (31) provided with a flange portion (312), and a fluororesin seal member (4),
The outer periphery holding portion (41) of the fluororesin seal member (4) is directly fitted on the peripheral surfaces (321) and (322) of the axial end (32) of the rubber elastic seal member (3). The outer peripheral holding portion (41) is fitted into the annular groove (411) provided in the outer peripheral holding portion (41) in the axial direction of the rubber elastic material sealing member (3). A sealing device, wherein the end (32) is inserted . 前記軸方向端部（３２）には、前記金属補強環（３１）の前記円筒状部（３１１）の内外周面にゴム状弾性材層（３２３）、（３２４）が存在することを特徴とする請求項１記載の密封装置。 The axial end portion (32) has rubber-like elastic material layers (323) and (324) on the inner and outer peripheral surfaces of the cylindrical portion (311) of the metal reinforcing ring (31). The sealing device according to claim 1. 前記ハウジング（１）の内周面（１１）には、前記金属補強環（３１）の前記円筒状部（３１１）の外周面と前記フッ素樹脂材製シール部材（４）の前記外周保持部（４１）の外周面が直接嵌合していることを特徴とする請求項１または２記載の密封装置。 The inner peripheral surface (11) of the housing (1) has an outer peripheral surface of the cylindrical portion (311) of the metal reinforcing ring (31) and an outer peripheral holding portion (of the fluororesin material sealing member (4)). 41. The sealing device according to claim 1, wherein the outer peripheral surface of 41) is directly fitted . 前記フッ素樹脂材製シール部材（４）の環状シールリップ（４２）は、前記外周保持部（４１）の軸方向端部よりも前記ゴム状弾性材製シール部材（３）側の内周面に位置する形で形成されていることを特徴とする請求項１〜３いずれか一項に記載の密封装置。 The annular seal lip (42) of the fluororesin material seal member (4) is closer to the inner peripheral surface on the rubber elastic material seal member (3) side than the axial end of the outer periphery holding portion (41). The sealing device according to any one of claims 1 to 3, wherein the sealing device is formed in a position .
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