WO2013187152A1 - 磁性流体シール - Google Patents
磁性流体シール Download PDFInfo
- Publication number
- WO2013187152A1 WO2013187152A1 PCT/JP2013/062828 JP2013062828W WO2013187152A1 WO 2013187152 A1 WO2013187152 A1 WO 2013187152A1 JP 2013062828 W JP2013062828 W JP 2013062828W WO 2013187152 A1 WO2013187152 A1 WO 2013187152A1
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- WIPO (PCT)
- Prior art keywords
- housing
- magnetic fluid
- fluid seal
- magnetic flux
- magnetic
- Prior art date
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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
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/762—Sealings of ball or roller bearings by means of a fluid
- F16C33/763—Sealings of ball or roller bearings by means of a fluid retained in the sealing gap
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/762—Sealings of ball or roller bearings by means of a fluid
- F16C33/763—Sealings of ball or roller bearings by means of a fluid retained in the sealing gap
- F16C33/765—Sealings of ball or roller bearings by means of a fluid retained in the sealing gap by a magnetic field
-
- 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
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
Definitions
- the present invention relates to a magnetic fluid seal used for a transmission unit for movement into a sealed space.
- a magnetic fluid seal is used that can keep oil mist and the like from a bearing less intruded and keep the inside of the device clean (Patent Literature). 1 etc.).
- the magnetic fluid seal is also applied to a bearing portion of a transfer robot used in a clean environment because of the same advantages, and further expansion of application fields is expected in the future.
- the magnetic fluid seal according to the prior art has a problem that when a large load is applied to the rotating shaft of the device to which the magnetic fluid is applied, the magnetic fluid seal bears a large part of the load. Therefore, when it is assumed that a large load is applied to the rotating shaft, the magnetic fluid seal according to the prior art is very large as a bearing that can be supported by the load or incorporated in the magnetic fluid seal. It is necessary to use an expensive bearing, and there are problems in terms of downsizing and cost.
- the present invention has been made in view of such problems, and an object of the present invention is to provide a magnetic fluid seal that can be suitably applied to a rotating shaft to which a load is applied.
- a housing arranged to be relatively movable in the radial direction of And a magnetic fluid held in the minute gap by the magnetic flux generated by the magnetic flux generation means.
- the magnetic fluid seal according to the prior art has a structure in which the housing is fixed to the apparatus and the rotating shaft is firmly supported through the bearing and the housing because of the necessity of maintaining a gap in which the magnetic fluid is interposed, the load is received. It had the problem of being easy.
- the housing is disposed so as to be relatively movable in the radial direction of the rotary shaft with respect to the device end portion, for example, a large load is applied to the rotary shaft, and the inclination or radial direction is increased. Even when vibration is generated, the entire magnetic fluid seal can follow the movement of the rotating shaft, and the magnetic fluid seal can be prevented from receiving a load.
- the housing may be movable relative to the device end in the rotation direction of the rotary shaft,
- the relative movement range of the housing relative to the device end may be limited by a rotation stopper connected to the device end and engageable with the housing.
- the magnetic fluid seal in which the housing is relatively movable in both the radial direction and the rotational direction is realized by a simple mode in which the housing is not fixed to the apparatus end, so that the structure is simple, easy to manufacture and durable. Excellent in properties. Further, since the rotation stop portion limits the relative movement range of the housing, the housing itself does not rotate indefinitely.
- the magnetic fluid seal according to the present invention may have a secondary seal portion that seals between the housing and the device end.
- the secondary seal portion seals between the housing and the device end so that the airtightness in the device is kept good.
- the magnetic fluid seal according to the present invention may have a bearing portion that supports the housing so as to be rotatable relative to the rotating shaft.
- the magnetic fluid seal according to the present invention is an embodiment in which the housing is not at least completely fixed to the device end.
- the bearing portion supports the housing with respect to the rotating shaft, the entire magnetic fluid seal is attached to the rotating shaft, and the magnetic fluid seal can be more effectively avoided from receiving a load. .
- FIG. 1 is a schematic view of an apparatus to which a magnetic fluid seal according to an embodiment of the present invention is applied.
- FIG. 2 is a cross-sectional view of a main part of the magnetic fluid seal shown in FIG.
- FIG. 3 is a plan view of the magnetic fluid seal shown in FIG. 2 as viewed from the outside of the machine.
- FIG. 1 is a schematic view of a manufacturing apparatus to which a magnetic fluid seal 20 according to an embodiment of the present invention is applied.
- the magnetic fluid seal 20 seals between the apparatus flange 14 (apparatus end) provided in the chamber 18 of the manufacturing apparatus and the rotary shaft 16 penetrating the apparatus flange 14.
- the outer end of the rotating shaft 16 is connected to a driving device 12 such as a motor or a gear box, and the rotating shaft 16 is rotated by the rotational force of the driving device 12.
- the end of the rotary shaft 16 on the inside of the machine is located inside the chamber 18 and is connected to the arm 19.
- the manufacturing apparatus can keep the inside of the chamber 18 in an airtight state with respect to the outside of the chamber 18, and switches and maintains the negative pressure state, the pressurized state, and the atmospheric pressure state as necessary.
- an arm 19 driven via the rotary shaft 16 can carry the member and the like.
- FIG. 2 is a cross-sectional view of a main part of the magnetic fluid seal 20 shown in FIG.
- the magnetic fluid seal 20 includes a housing 38 including a permanent magnet 28 and pole pieces 24 and 26, a shaft 22, bearings 34 and 36, O-rings 40 and 42, a rotation prevention pin 46, and the like.
- the shaft 22 has a bottomless cylindrical shape.
- the shaft 22 is fixed to the outer peripheral surface of the rotating shaft 16 and rotates together with the rotating shaft 16.
- the method for fixing the shaft 22 is not particularly limited, and the shaft 22 is fixed to the rotating shaft 16 using, for example, a set collar, a key, a bolt, or the like.
- An O-ring for sealing is provided between the shaft 22 and the rotating shaft 16.
- the shaft 22 is made of a magnetic material, and a magnetic flux generated by a permanent magnet 28 described later passes through the shaft 22.
- the shaft 22 and the rotating shaft 16 correspond to the rotating shaft in the claims.
- the shaft 22 may not be used. In this case, the rotating shaft 16 corresponds to the rotating shaft.
- the housing 38 has a cylindrical portion inserted into a through-hole formed in the apparatus flange 14 and a flange portion connected to the end portion on the machine outside of the cylindrical portion and protruding in the outer diameter direction. Between the outer peripheral surface of the cylindrical portion of the housing 38 and the inner peripheral surface of the apparatus flange 14, O-rings 40 and 42 are disposed as secondary seals for sealing between the housing 38 and the apparatus flange 14.
- the inner peripheral surface 38a of the cylindrical portion of the housing 38 is provided with permanent magnets 28 as magnetic flux generating means and pole pieces 24 and 26 as magnetic flux transmitting means.
- the permanent magnet 28 generates a magnetic flux, and the magnetic flux is transmitted by the pole pieces 24 and 26 arranged around the permanent magnet 28, the shaft 22 and the magnetic fluid, thereby forming a magnetic path.
- the permanent magnet 28 is connected to the pole pieces 24, 26 or to the housing 38.
- the pole pieces 24 and 26 are ring-shaped, arranged on both sides with the permanent magnet 28 sandwiched in the axial direction, and are made of a magnetic material.
- the pole pieces 24 and 26 transmit magnetic flux generated by the permanent magnet 28.
- the outer peripheral ends of the pole pieces 24 and 26 are attached to the inner peripheral surface 38 a of the cylindrical portion of the housing 38, and the pole pieces 24 and 26 are attached so as not to rotate relative to the housing 38.
- the inner peripheral ends of the pole pieces 24 and 26 are opposed to the outer peripheral surface 22a of the shaft 22 with a minute gap formed therebetween.
- the magnetic fluid 44 is held by the magnetic flux generated by the permanent magnet 28.
- the magnetic fluid 44 include those in which magnetic ultrafine particles having a particle size of about 5 to 50 nm are dispersed in a solvent or oil (base oil) using a surfactant, and move along the magnetic flux. And has a characteristic of being trapped in a magnetic field. The magnetic fluid 44 can ensure the sealing performance between the pole pieces 24 and 26 and the outer peripheral surface 22 a of the shaft 22.
- Irregularities may be formed on one or both of the inner peripheral ends of the pole pieces 24 and 26 and the outer peripheral surface 22a of the shaft 22 facing the pole pieces 24 and 26. By forming such irregularities, the magnetic fluid 44 is easily held in the minute gap.
- FIG. 3 is a plan view of the magnetic fluid seal 20 as viewed from the outside of the machine.
- a notch 38 b is formed in the flange portion of the housing 38.
- a detent pin 46 that can be engaged with the notch 38b of the housing 38 is disposed in the notch 38b. As shown in FIG. 2, the detent pin 46 is screwed to the device flange 14, and can engage with the notch 38 b of the housing 38 to limit the relative movement range of the housing 38 in the rotational direction. it can.
- bearings 34 and 36 that are bearing portions are arranged.
- the bearings 34 and 36 are disposed on both sides in the axial direction with the hole pieces 24 and 26 and the permanent magnet 28 interposed therebetween.
- Non-magnetic spacers 30 and 32 are sandwiched between the bearings 34 and 36 and the pole pieces 24 and 26 to prevent the magnetic flux generated by the permanent magnet 28 from leaking from the pole pieces 24 and 26. Yes.
- the inner peripheral surfaces of the bearings 34 and 36 are connected to the outer peripheral surface 22a of the shaft 22, and the outer peripheral surfaces of the bearings 34 and 36 are connected to the inner peripheral surface 38a of the housing 38. 38 is supported so as to be rotatable relative to the shaft 22.
- the housing 38 is not fixed to the apparatus flange 14. Therefore, the housing 38 can move relative to the apparatus flange 14 in the radial direction, the axial direction, and the rotational direction 50 of the rotary shaft 16.
- the housing 38 can move relative to the apparatus flange 14 in the radial direction of the rotating shaft 16, even when a large load is applied to the rotating shaft 16 and tilt or radial vibration occurs, the magnetic force is also reduced.
- the entire fluid seal 20 can follow the movement of the rotary shaft 16.
- the magnetic fluid seal 20 can preferably avoid receiving a load via the rotating shaft 16, which is advantageous for downsizing and is preferably applied to the rotating shaft 16 that is loaded. Can do.
- the magnetic fluid seal 20 does not need to use a bearing having high durability as the bearings 34 and 36, and has an advantage in cost.
- the O-rings 40 and 42 disposed between the housing 38 and the apparatus flange 14 are made of a material having an appropriate elasticity such as an elastomer. It is preferable to be produced. Thereby, the O-rings 40 and 42 can seal between the housing 38 and the apparatus flange 14 more suitably, and the magnetic fluid seal 20 can keep the airtight state in the apparatus flange 14 suitably.
- the magnetic fluid seal 20 fixes the housing 38 and the device flange 14 to each other. It is realized by a simple structure that does not. Therefore, the magnetic fluid seal 20 is easy to assemble and manufacture and has high durability.
- the rotation prevention pin 46 fixed to the device flange 14 limits the relative movement range of the housing 38, so that the housing 38 does not rotate more than a predetermined rotation angle. (See FIG. 3). Accordingly, the magnetic fluid seal 20 can perform an appropriate movement following the rotation shaft 16 in a situation where the rotation shaft 16 is deformed or the rotation shaft 16 and the shaft 22 vibrate.
- the space between the device flanges 14 can be suitably sealed.
- the bearings 34 and 36 support the housing 38 so as to be rotatable relative to the shaft 22, the ferrofluid seal 20 is interposed via the shaft 22 even when the housing 38 is not fixed to the apparatus flange 14.
- the rotary shaft 16 is appropriately supported.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
Description
装置端部と、前記装置端部を貫通する回転シャフトとの間を封止する磁性流体シールであって、
磁束を発生する磁束発生手段と、前記回転シャフトに対して微少隙間を形成して対向しており前記磁束を伝達する磁束伝達手段と、を備えており、前記装置端部に対して前記回転シャフトの径方向に相対移動可能に配置されるハウジングと、
前記磁束発生手段により発生された前記磁束により前記微少隙間に保持される磁性流体と、を有する。
前記ハウジングは、前記装置端部に接続しており前記ハウジングと係合可能な回転止め部によって、前記装置端部に対する前記回転方向の相対移動範囲を制限されても良い。
図1は、本発明の一実施形態に係る磁性流体シール20を適用した製造装置の概略図である。磁性流体シール20は、製造装置のチャンバ18に設けられた装置フランジ14(装置端部)と、装置フランジ14を貫通する回転軸16との間を封止する。回転軸16の機外側の端部は、モータやギヤボックス等の駆動装置12に接続されており、回転軸16は、駆動装置12の回転力によって回転する。回転軸16の機内側の端部は、チャンバ18内部に位置しており、アーム19に接続されている。製造装置は、チャンバ18の内部を、チャンバ18の外部に対して気密状態に保つことが可能であり、必要に応じて負圧状態、加圧状態、大気圧状態に切り換え及び維持する。チャンバ18の内部では、回転軸16を介して駆動されるアーム19が、部材の搬送等を行うことができる。
14…装置フランジ
16…回転軸
18…チャンバ
19…アーム
20…磁性流体シール
22…シャフト
22a…シャフト外周面
24,26…ポールピース
28…永久磁石
30,32…スペーサ
34,36…ベアリング
38…ハウジング
38a…ハウジング内周面
38b…切り欠き
40,42…Oリング
44…磁性流体
46…回り止めピン
50…回転方向
Claims (4)
- 装置端部と、前記装置端部を貫通する回転シャフトとの間を封止する磁性流体シールであって、
磁束を発生する磁束発生手段と、前記回転シャフトに対して微少隙間を形成して対向しており前記磁束を伝達する磁束伝達手段と、を備えており、前記装置端部に対して前記回転シャフトの径方向に相対移動可能に配置されるハウジングと、
前記磁束発生手段により発生された前記磁束により前記微少隙間に保持される磁性流体と、を有する磁性流体シール。 - 前記ハウジングは、前記装置端部に対して、前記回転シャフトの回転方向に相対移動可能であって、
前記ハウジングは、前記装置端部に接続しており前記ハウジングと係合可能な回転止め部によって、前記装置端部に対する前記回転方向の相対移動範囲を制限される請求項1に記載の磁性流体シール。 - 前記ハウジングと前記装置端部の間を封止する2次シール部を有することを特徴とする請求項1又は請求項2に記載の磁性流体シール。
- 前記ハウジングを前記回転シャフトに対して相対回転可能に支持する軸受け部を有することを特徴とする請求項1から請求項3までのいずれかに記載の磁性流体シール。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/391,126 US9816616B2 (en) | 2012-06-14 | 2013-05-07 | Magnetic fluid seal |
KR1020147029264A KR101648921B1 (ko) | 2012-06-14 | 2013-05-07 | 자성유체실링 |
CN201380019084.7A CN104204633B (zh) | 2012-06-14 | 2013-05-07 | 磁流体密封件 |
JP2014521022A JP6031102B2 (ja) | 2012-06-14 | 2013-05-07 | 磁性流体シール |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012134853 | 2012-06-14 | ||
JP2012-134853 | 2012-06-14 |
Publications (1)
Publication Number | Publication Date |
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WO2013187152A1 true WO2013187152A1 (ja) | 2013-12-19 |
Family
ID=49757986
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/062828 WO2013187152A1 (ja) | 2012-06-14 | 2013-05-07 | 磁性流体シール |
Country Status (5)
Country | Link |
---|---|
US (1) | US9816616B2 (ja) |
JP (1) | JP6031102B2 (ja) |
KR (1) | KR101648921B1 (ja) |
CN (1) | CN104204633B (ja) |
WO (1) | WO2013187152A1 (ja) |
Cited By (1)
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JP2017176132A (ja) * | 2016-03-31 | 2017-10-05 | グローブライド株式会社 | 魚釣用スピニングリール |
Families Citing this family (5)
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CN112178203B (zh) * | 2020-10-21 | 2021-05-14 | 清华大学 | 磁性液体密封装置 |
CN112555288B (zh) * | 2020-12-11 | 2022-04-08 | 自贡兆强密封制品实业有限公司 | 一种磁性液体密封总成 |
CN113494608B (zh) * | 2021-08-02 | 2022-07-22 | 北京交通大学 | 一种能耐轴向和径向振动的磁性液体密封装置 |
US11905947B2 (en) * | 2021-10-29 | 2024-02-20 | Gd Energy Products, Llc | Fluid end of a hydraulic fluid pump and method of assembling the same |
KR102612086B1 (ko) * | 2022-09-05 | 2023-12-11 | 주식회사 셀비드 | 파티클 프리 원격플라즈마소스 차단밸브 |
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2013
- 2013-05-07 KR KR1020147029264A patent/KR101648921B1/ko active IP Right Grant
- 2013-05-07 CN CN201380019084.7A patent/CN104204633B/zh active Active
- 2013-05-07 JP JP2014521022A patent/JP6031102B2/ja active Active
- 2013-05-07 WO PCT/JP2013/062828 patent/WO2013187152A1/ja active Application Filing
- 2013-05-07 US US14/391,126 patent/US9816616B2/en active Active
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JP2000002338A (ja) * | 1998-06-12 | 2000-01-07 | Nok Corp | 磁性流体を利用した密封装置 |
JP2000141269A (ja) * | 1998-11-12 | 2000-05-23 | Nitta Ind Corp | 過負荷保護装置 |
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Also Published As
Publication number | Publication date |
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CN104204633A (zh) | 2014-12-10 |
CN104204633B (zh) | 2016-09-07 |
JPWO2013187152A1 (ja) | 2016-02-04 |
KR20140138997A (ko) | 2014-12-04 |
KR101648921B1 (ko) | 2016-08-17 |
US9816616B2 (en) | 2017-11-14 |
JP6031102B2 (ja) | 2016-11-24 |
US20150115541A1 (en) | 2015-04-30 |
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