WO2011036920A1 - シール装置 - Google Patents
シール装置 Download PDFInfo
- Publication number
- WO2011036920A1 WO2011036920A1 PCT/JP2010/060016 JP2010060016W WO2011036920A1 WO 2011036920 A1 WO2011036920 A1 WO 2011036920A1 JP 2010060016 W JP2010060016 W JP 2010060016W WO 2011036920 A1 WO2011036920 A1 WO 2011036920A1
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- WO
- WIPO (PCT)
- Prior art keywords
- shaft
- magnetic force
- magnetic
- sealing
- transmission member
- Prior art date
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- 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
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- 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
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
Definitions
- oxidation, diffusion, or CVD Chemical Vapor Deposition
- CVD Chemical Vapor Deposition
- the wafer is stored in a chamber or container (hereinafter collectively referred to as a processing chamber) held in a predetermined environment, and is processed by being exposed to the atmosphere in the processing chamber while being rotated, for example. Therefore, the processing chamber used for such processing is required to have high airtightness and to be able to transmit mechanical motion from the outside of the processing chamber to the inside of the processing chamber, for example, by rotating a wafer.
- an apparatus bearing 52 is also provided on the processing chamber 50 side.
- the bearing 55 is incorporated in the seal portion, there are problems that the total length of the seal device becomes long and the seal design is restricted by the size of the bearing. Further, in the case of a sealing device provided with a bearing, there is a problem that the shaft must be delivered.
- a second object of the present invention is to provide a sealing device having a short axial length.
- a third object of the present invention is to provide a cartridge type sealing device.
- a sealing device of the present invention firstly includes a predetermined machine inside a processing chamber held in a predetermined environment while maintaining the environment of the processing chamber from the outside of the processing chamber.
- Shaft sealing device for transmitting dynamic motion A housing through which the shaft passes; Magnetic force generating means disposed between the housing and the shaft to generate a magnetic force around the shaft; A pair of inwardly projecting edges that project from the housing toward the shaft to form a sealing groove surrounding the shaft, and are disposed adjacent to one side of the magnetic force generating means and generated by the magnetic force generating means; A first magnetic transmission member for transmitting a magnetic force and an inward projecting edge protruding from the housing toward the shaft, and disposed adjacent to the other side of the magnetic force generation means and generated by the magnetic force generation means A second magnetic transmission member for transmitting the magnetic force to be applied; A slide bush disposed between the inner projecting edge of the second magnetic transmission member and the shaft and fixed to the inner projecting edge with a slight clearance with respect to the outer surface of
- the seal member has four protrusions protruding toward the respective apexes of the substantially rectangular shape of the sealing groove, and of the two protrusions protruding toward the shaft among the protrusions.
- a fluid holding groove for holding the magnetic fluid is formed between them.
- a sealing member having a protrusion protruding toward each of the vertices of the rectangular shape is accommodated in the sealing groove having a substantially rectangular cross section.
- the magnetic fluid suitably acts as a lubricant in the vicinity of the sliding surface between the shaft and the sealing member, and can extend the sliding life of the sealing member.
- the axial length of the sealing device can be shortened, and the radial dimension can be freely designed without being influenced by the bearing size. Can do.
- sharing the member that fixes the slide bush with the magnetic transmission member that forms the magnetic circuit it is possible to effectively utilize the space and contribute to the reduction of the axial length.
- the sealing device of the present invention is a seal for a shaft that transmits a predetermined mechanical motion to the inside of a processing chamber held in a predetermined environment while maintaining the environment of the processing chamber from the outside of the processing chamber.
- the fluid holding projection that projects toward the shaft and the seal member is formed on the first inward projecting edge of the magnetic transmission member.
- the sliding surface with respect to the shaft in the seal member is arranged in the state of being close to the fluid holding projection that holds the most magnetic fluid. Therefore, the distance between the magnetic fluid held by the magnetic transmission member and the seal member is shortened, and the magnetic fluid can easily reach the sliding surface of the seal member. That is, in the sealing device according to the present subject matter, the magnetic fluid suitably acts as a lubricant in the vicinity of the sliding surface between the shaft and the sealing member, and can extend the sliding life of the sealing member.
- the axial length of the sealing device can be shortened, and the radial dimension can be freely designed without being influenced by the bearing size. Can do.
- sharing the member that fixes the slide bush with the magnetic transmission member that forms the magnetic circuit it is possible to effectively utilize the space and contribute to the reduction of the axial length.
- the sealing device of the present invention has a shaft for transmitting a predetermined mechanical motion to the inside of a processing chamber held in a predetermined environment while maintaining the environment of the processing chamber from the outside of the processing chamber.
- a first magnetic transmission member for transmitting a magnetic force and an inward projecting edge protruding from the housing toward the shaft, and disposed adjacent to the other side of the magnetic force generation means and generated by the magnetic force generation means
- a slide bush disposed between the inner projecting edge of the second magnetic transmission member and the shaft and fixed to the inner projecting edge so as to have a very small clearance with respect to the outer peripheral surface of the
- the sealing member is accommodated in the sealing groove having a dovetail shape.
- the sliding surface with respect to the shaft in the seal member is arranged in a state close to the tip of the magnetic transmission member that holds a large amount of magnetic fluid. Therefore, the distance between the magnetic fluid held by the magnetic transmission member and the sliding surface of the seal member is shortened, and the magnetic fluid can easily reach the sliding surface of the sealing member. That is, in the sealing device according to the present invention, the magnetic fluid suitably acts as a lubricant in the vicinity of the sliding surface between the shaft and the sealing member, and can extend the sliding life of the sealing member.
- the sleeve is fitted to a portion of the outer peripheral surface of the shaft facing the first and second magnetic pole members. It is said.
- the sealing device can also be used for an existing shaft, and can be said to be a complete cartridge type sealing device.
- the present invention has the following excellent effects. (1) Since a sealing member having a protruding portion that protrudes toward each of the apexes of the rectangular shape is housed in a sealing groove having a substantially rectangular cross-sectional shape, among the protruding portions of the sealing member, on the shaft side The two protrusions that protrude and constitute the sliding surface with respect to the shaft are arranged in the state of being close to the tip of the magnetic transmission member to which a large amount of magnetic fluid is fixed, and the magnetic fluid held by the magnetic transmission member Therefore, the distance between the sliding surfaces of the seal member is shortened and the magnetic fluid can easily reach the sliding surface of the seal member, so that the magnetic fluid preferably acts as a lubricant in the vicinity of the sliding surface of the shaft and the seal member.
- the sliding surface of the seal member with respect to the shaft has the most magnetic fluid. It will be arranged in the state of being close to the fluid holding protrusion to be held, the distance between the magnetic fluid held by the magnetic transmission member and the seal member will be shortened, and the magnetic fluid will be easy to the sliding surface of the seal member Therefore, the magnetic fluid suitably acts as a lubricant in the vicinity of the sliding surface between the shaft and the seal member, and can extend the sliding life of the seal member.
- the axial length of the sealing device can be shortened, and the radial dimension can be freely designed without being influenced by the bearing size. Can do.
- sharing the member that fixes the slide bush with the magnetic transmission member that forms the magnetic circuit it is possible to effectively utilize the space and contribute to the reduction of the axial length.
- the sealing member Since the sealing member is accommodated in the sealing groove having a dovetail shape, the sliding surface of the sealing member with respect to the shaft is arranged in the state of being close to the tip of the magnetic transmission member that holds a large amount of magnetic fluid. Therefore, the distance between the magnetic fluid held by the magnetic transmission member and the sliding surface of the seal member is shortened, and the magnetic fluid can easily reach the sliding surface of the sealing member. It acts suitably as a lubricant in the vicinity of the sliding surface of the member, and the sliding life of the seal member can be extended.
- the axial length of the sealing device can be shortened, and the radial dimension can be freely designed without being influenced by the bearing size. Can do.
- sharing the member that fixes the slide bush with the magnetic transmission member that forms the magnetic circuit it is possible to effectively utilize the space and contribute to the reduction of the axial length.
- the sealing device can be used for an existing shaft, and a complete cartridge type sealing device can be provided.
- FIG. 1 is a cross-sectional view illustrating a sealing device 1 according to Embodiment 1 of the present invention.
- the sealing device 1 is disposed so as to close the opening 22 of the flange 21 provided in the processing chamber 20, and can keep the inside of the processing chamber 20 airtight with respect to the outside of the processing chamber.
- a bearing 23 for supporting the shaft 25 is provided in the opening 22.
- the processing chamber 20 in which the sealing device 1 according to the present embodiment is arranged is not particularly limited, and examples thereof include a wafer processing chamber for processing a silicon wafer, a load lock chamber that repeats a vacuum state and an atmospheric pressure state, and the like. It is done. Further, the inside of the processing chamber may be held in a negative pressure environment with respect to the outside of the processing chamber, or may be held in an equal pressure or pressurized environment.
- the sealing device 1 includes a housing 2 made of a nonmagnetic material, a magnet 3 as magnetic force generating means, first and second magnetic pole members 4 and 5 as magnetic transmission members, an X ring 6 as a sealing member, and lubrication. It has a magnetic fluid 7 as an agent and a slide bush 12 as a centering member.
- the shaft 25 is disposed so as to penetrate the cylindrical housing 2.
- the magnet 3 and the first magnetic pole member 4 may be integrally formed. Alternatively, the magnet 3 may also serve as a part of the first magnetic pole member 4. For example, a portion (first inward protruding edge 8 a) that fixes the magnetic fluid 7 in the first magnetic pole member 4 may be used as the magnetic force generating means. .
- the end of the shaft 25 on the outside of the processing chamber is connected to a drive unit (not shown).
- the shaft 25 according to the present embodiment can rotate about the rotation center A by the driving force from the driving unit.
- An end of the shaft 25 on the side of the processing chamber is connected to a driving unit (not shown) arranged inside the processing chamber 20.
- the shaft 25 according to the present embodiment can transmit the rotational motion generated by the drive unit disposed outside the processing chamber 20 to the inside of the processing chamber 20.
- the shaft 25 is formed using a magnetic material, but the entire shaft is not limited to a solid magnetic material.
- the housing 2 is a cylindrical member installed so that the shaft 25 penetrates, and is fixed to the flange 21 of the processing chamber 20 by a fixing means such as a bolt 9.
- a predetermined interval is provided between the inner peripheral surface 2a of the housing 2 and the outer peripheral surface 25a of the shaft 25 so that the magnet 3, the first magnetic pole member 4, the second magnetic pole member 5, the X ring 6 and the like can be arranged. Is provided.
- An annular second magnetic pole member 5 is connected to the end of the magnet 3 outside the processing chamber.
- the second magnetic pole member 5 is a magnetic material provided so as to be in contact with the magnet 3.
- the inner peripheral edge 5 a that is the inner peripheral end of the second magnetic pole member 5 is disposed with a slight gap with respect to the outer peripheral surface 25 a of the shaft 25. Further, the outer peripheral end 5 b of the second magnetic pole member 5 may be fixed to the inner peripheral surface 2 a of the housing 2.
- An annular first magnetic pole member 4 is connected to the end of the magnet 3 on the inside of the processing chamber.
- the first magnetic pole member 4 is a magnetic material provided so as to contact the magnet 3.
- the outer peripheral end 4 b of the first magnetic pole member 4 is fixed to the inner peripheral surface 2 a of the housing 2.
- the static seal member 10 which seals between the outer peripheral edge part 4b of the 1st magnetic pole member 4 and the internal peripheral surface 2a of the housing 2 may be provided. .
- the first magnetic pole member 4 has a first inner projecting edge 8 a and a second inner projecting edge 8 b that project from the inner peripheral surface 2 a side of the housing 2 toward the outer peripheral surface 25 a side of the shaft 25.
- the first inner projecting edge 8a and the second inner projecting edge 8b have substantially symmetrical shapes, and a shaft is interposed between the first inner projecting edge 8a and the second inner projecting edge 8b.
- a sealing groove 11 having an opening on the 25 side is formed.
- the cross section of the sealing groove 11 observed by the cross section passing through the rotation center A of the shaft 25 has a substantially rectangular shape.
- the X-ring 6 has a first protrusion 6a, a second protrusion 6b, a third protrusion 6c, and a fourth protrusion 6d that protrude toward each of the rectangular shapes of the cross section of the sealing groove 11.
- the third protrusion 6c and the fourth protrusion 6d protrude toward the apex on the bottom 11a side of the sealing groove 11 among the apexes of the rectangular shape. Further, the first to fourth protrusions of the X ring 6 are continuous along the circumferential direction of the X ring 6.
- the third protrusion 6c and the fourth protrusion 6d are in contact with the bottom 11a of the sealing groove 11, and the X ring 6 and the sealing groove 11 are in close contact with each other in the circumferential direction.
- the inner diameter of the X ring 6 is designed to be a diameter that is substantially the same as the diameter of the shaft 25 or slightly smaller. Therefore, when the shaft 25 rotates about the rotation center A, the first protrusion 6 a and the second protrusion 6 b of the X ring 6 slide with respect to the outer peripheral surface 25 a of the shaft 25. Thereby, the X ring 6 according to the first embodiment can seal between the first magnetic pole member 4 and the shaft 25.
- a fluid holding groove 6e for allowing the magnetic fluid 7 to go around to the second protrusion 6b is formed. That is, the fluid holding groove 6e guides the magnetic fluid 7 from the first protrusion 6a to the second protrusion 6b by the surface tension between the fluid holding groove 6e and the outer peripheral surface 25a of the shaft 25 facing the fluid holding groove 6e. Designed to be able to.
- the fluid holding groove 6e can hold the magnetic fluid 7 between the fluid holding groove 6e and the outer peripheral surface 25a of the shaft 25 facing the fluid holding groove 6e.
- the magnetic fluid 7 used in this embodiment is obtained by dispersing magnetic ultrafine particles having a particle size of about 5 to 50 nm in a solvent or oil (base oil) using a surfactant, and moves along the lines of magnetic force. It has the property of being trapped in a magnetic field.
- the magnetic fluid 7 is used as a lubricant that acts on the sliding surfaces of the shaft 25 and the X ring 6 and extends the sliding life of the X ring 6.
- the magnetic fluid 7 can secure the sealing performance on the sliding surface of the X ring 6 and the shaft 25 and can suppress dust generation near the sliding surface.
- the magnetic fluid 7 may be held also at the tip of the second inner protruding edge 8b.
- the magnetic fluid 7 held near the tip of the second inner protruding edge 8 b can easily reach the second protrusion 6 b of the X ring 6.
- the second inner protruding edge 8b does not pass as much magnetic flux as the first inner protruding edge 8a. Accordingly, the amount of the magnetic fluid 7 held at the tip of the second inner protruding edge 8b is small, and the second protrusion 6b and the shaft can be obtained only with the magnetic fluid 7 held at the tip of the second inner protruding edge 8b.
- the sliding surface with the outer peripheral surface 25a of 25 cannot be sufficiently lubricated.
- FIG. 2 is a front sectional view showing a sealing device 15 according to Embodiment 2 of the present invention.
- the shape of the first magnetic pole member 16 and the shape of the O-ring 17 used as the sealing member are the first magnetic pole member 4 provided in the sealing device 1 according to the first embodiment.
- the shape of the X ring 6 is different.
- the other parts are the same as those of the sealing device 1 according to the first embodiment, and the same members as those in the first embodiment are denoted by the same members as those in the first embodiment.
- a fluid holding protrusion 19 that protrudes toward the shaft 25 and the O-ring 17 is formed at the tip of the first inward protruding edge 18 a that faces toward the side close to the shaft 25.
- the fluid holding projection 19 is disposed so as to form a slight gap with the outer peripheral surface 25 a of the shaft 25.
- the magnetic fluid 7 is held near the tip 19 a of the fluid holding projection 19 by the magnetic force generated by the magnet 3.
- the O-ring 17 is accommodated in the sealing groove 14.
- the O-ring 17 according to the present embodiment has a substantially circular or elliptical cross-sectional shape when observed in a cross-section passing through the rotation center A of the shaft 25.
- a part of the O-ring 17 is stored in a state of protruding from the opening of the sealing groove 14.
- the ring outer peripheral end portion 17b of the O-ring 17 is in contact with the bottom portion 14a of the sealing groove 14, and the outer peripheral end portion 17b of the O-ring 17 and the bottom portion 14a of the sealing groove 14 are in close contact with each other in the circumferential direction. .
- the O-ring 17 can seal between the first magnetic pole member 16 and the shaft 25.
- the ring inner peripheral end portion 17 a which is a sliding surface in the O-ring 17 is the tip of the fluid holding projection 19. It arrange
- the fluid holding protrusion 19 is formed on the first inner protrusion edge 18a close to the magnet 3 among the two inner protrusion edges 18a and 18b. More magnetic flux passes through the first inner projecting edge 18a adjacent to the magnet 3 than the second inner projecting edge 18b. Therefore, by forming the fluid holding projection 19 on the first inner projecting edge 18 a, more magnetic fluid 7 can be held by the fluid holding projection 19.
- FIG. 3 is a front sectional view showing a sealing device 30 according to Embodiment 3 of the present invention.
- the sealing device 30 according to the third embodiment is that the sleeve 31 is fitted to the portion of the outer peripheral surface of the shaft 25 facing the first and second magnetic pole members 4 and 5, and the sealing device 1 according to the first embodiment. And different.
- the other parts are almost the same as those of the sealing device 1 according to the first embodiment, and the same members as those in the first embodiment are denoted by the same reference numerals as those in the first and first embodiments.
- the sleeve 31 is fitted to a portion of the outer peripheral surface of the shaft 25 facing the first and second magnetic pole members 4 and 5, has an annular shape, and is made of a magnetic material.
- An annular O-ring groove 32 opened toward the shaft outer peripheral surface 25 a is provided on the inner peripheral surface side of the sleeve 31, and an annular O-ring 33 is attached to the O-ring groove 32. The space between the peripheral surface and the shaft outer peripheral surface 25a is sealed.
- the cross-sectional shape of the sleeve 31 is substantially rectangular as shown in FIG. 3, and the diameter of the portion 31 a facing the first magnetic pole member 4 is larger than the diameter of the portion 31 b facing the second magnetic pole member 5.
- the step 31c is formed.
- the sleeve 31 is installed so that the stepped portion 31 c has a very small gap with the outer surface 12 c of the slide bush 12 provided on the inner peripheral protruding edge 5 a of the second magnetic pole member 5.
- the slide bush 12 is sandwiched between the first magnetic pole member 4 and the sleeve 31, the sleeve 31 can be easily positioned in the axial direction.
- the slide bush 12 is formed such that its inner peripheral surface 12a faces the small diameter portion 31b of the sleeve 31 with a very slight gap.
- the inner peripheral surface 5a of the second magnetic pole member 5 has a shape protruding inward by the level difference of the step portion 31 as compared with the case of the first embodiment.
- the sealing device 30 of the present embodiment by providing the sleeve 31, it is not necessary to deliver the shaft 25 including the shaft 25 as in the invention of the prior application, and it is sufficient to deliver only the sealing device 30 that does not include the shaft. In the case of replacement of the sealing device, only the sealing device 30 may be replaced without replacing the shaft.
- the seal device 30 can also be used for an existing shaft, and constitutes a complete cartridge type seal device.
- FIG. 4 is a front sectional view showing a sealing device 40 according to Embodiment 4 of the present invention.
- the sealing device 40 according to the fourth embodiment is that the sleeve 31 is fitted to the outer peripheral surface portion of the shaft 25 facing the first and second magnetic pole members 16 and 5, according to the second embodiment. And different. However, other parts are almost the same as those of the sealing device 15 according to the second embodiment, and the same members as those in the fifteenth embodiment are denoted by the same members as those in the second and second embodiments. Further, the sleeve 31 and the O-ring 33 are the same as those in the third embodiment, and a description thereof will be omitted.
- a semicircular split set collar (not shown) is fastened to one end in the axial direction of the sleeve 31 with a bolt or the like.
- the sleeve 31 can be fixed to the shaft 25 by tightening using means. Of course, it may be attached by other known methods.
- the sealing groove 14 formed in the first magnetic pole member 16 used in the second embodiment and the fourth embodiment has a dovetail shape as shown in FIG.
- the first inner projecting edge 18 a constitutes a part of the wall of the sealing groove 14, and the magnetic body holding projecting part 19 formed at the tip of the first inner projecting edge 18 a faces the sealing groove 14. Is inclined.
- the sealing groove 14 having a dovetail shape has a substantially circular or substantially elliptical cross-sectional shape when observed by a cross-section passing through the rotation center A of the shaft 25.
- An O-ring 17 is stored. Accordingly, the tip 19a of the fluid holding projection 19 that holds the magnetic fluid 7 is close to the O-ring 17, and the magnetic fluid 7 easily reaches the sliding surface of the shaft 25 and the O-ring 17, It can act suitably as a lubricant.
- the shape of the sealing groove 14 formed by the first inner projecting edge 18a and the second inner projecting edge 18b is not limited to the shape shown in FIG. 5A.
- FIG. 5B and FIG. It may have a shape as shown in FIG. FIG. 5B and FIG. 5C show a modification of the first magnetic pole member 16 shown in FIG.
- the first inner projecting edge 18a has a substantially symmetric shape with the second inner projecting edge 18b.
- the fluid holding projection 19 is formed at the tip of the first inner protruding edge 18 a, and the tip 19 a of the fluid holding projection 19 is close to the O-ring 17.
- the magnetic fluid 7 is held by the fluid holding protrusion 19, the magnetic fluid 7 is disposed so as to be close to the O-ring 17. Therefore, even when the first magnetic pole member 16 shown in FIG. 5B is used in the sealing devices 15 and 40 according to the second and fourth embodiments, the magnetic fluid 7 remains on the sliding surface of the shaft 25 and the O-ring 17. It reaches easily and can act suitably as a lubricant.
- the first inner protruding edge 18 a has a shape that is substantially symmetrical with the second inner protruding edge 18 b and protrudes toward the sealing groove 14. .
- the magnetic fluid 7 is held at the tip end portion 18a 'of the first inner projecting edge 18a.
- the first inward protruding edge 18a forming the sealing groove 14 protrudes toward the sealing groove 14, and the sealing groove 14 has a dovetail shape. For this reason, the distal end portion 18 a ′ of the first inner projecting edge 18 a is disposed so as to be close to the O-ring 17.
- the magnetic fluid 7 is held at the tip end portion 18a 'of the first inner projecting edge 18a, the magnetic fluid 7 and the O-ring 17 are also arranged close to each other. Therefore, even when the first magnetic pole member 16 shown in FIG. 5C is used in the sealing devices 15 and 40 according to the second and fourth embodiments, the magnetic fluid 7 can be easily applied to the sliding surfaces of the shaft 25 and the O-ring 17. Therefore, it can act suitably as a lubricant.
- Sealing device (Embodiment 1) 2 Housing 3 Magnet 4 First magnetic pole member (Embodiments 1 and 3) 5 Second magnetic pole member 6 X ring 7 Magnetic fluid 8a First inner projecting edge 8b of first magnetic pole member 4 Second inner projecting edge of first magnetic pole member 9 Bolt 10 Static seal member 11 Sealing groove Forms 1 and 3) 12 Slide bush 14 Sealing groove (Embodiments 2 and 4) 15 Sealing device (Embodiment 2) 16 First magnetic pole member (Embodiments 2 and 4) 17 O-ring 18a First inward protruding edge 18b of the first magnetic pole member 16 Second inward protruding edge of the first magnetic pole member 16 19 Fluid holding protrusion 20 Processing chamber 21 Flange 22 Opening 23 Bearing 25 Shaft 30 Sealing device (implementation) Form 3) 31 Sleeve 32 O-ring groove 33 O-ring 40 Sealing device (Embodiment 4)
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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)
- Sealing With Elastic Sealing Lips (AREA)
- Sealing Devices (AREA)
Abstract
Description
また、本発明の第3の目的は、カートリッジタイプのシール装置を提供することにある。
前記シャフトが貫通するハウジングと、
前記ハウジングと前記シャフトとの間に配置されて前記シャフトの周囲において磁力を発生する磁力発生手段と、
前記ハウジングから前記シャフトに向かって突出して前記シャフトを取り囲むシーリング溝を形成する一対の内方突縁を有し、前記磁力発生手段の一側に隣接して配置されて当該磁力発生手段で発生される磁力を伝達する第1の磁気伝達部材および前記ハウジングから前記シャフトに向かって突出する内方突縁を有し、前記磁力発生手段の他側に隣接して配置されて当該磁力発生手段で発生される磁力を伝達する第2の磁気伝達部材と、
前記第2の磁気伝達部材の内方突縁とシャフトとの間に配置されて前記シャフトの外側面に対してごく僅かな隙間を有するようにして前記内方突縁に固定されたスライドブッシュと、
少なくとも一部が前記シャフトに向かってはみ出した状態で前記シーリング溝に収納され、前記シャフトの外周面に対して摺動するシール部材と、
前記磁力発生手段により発生された磁力により前記シャフトと前記磁気伝達部材の間に保持される磁性流体と
を有し、前記シーリング溝は、前記シャフトの中心軸を通る断面の形状が略矩形形状であり、
前記シール部材は、前記シーリング溝の前記略矩形形状の頂点のそれぞれに向かって突出する4つの突起部を有しており、前記突起部のうち前記シャフト側に向かって突出する2つの突起部の間には、前記磁性流体を保持する流体保持溝が形成されていることを特徴としている。
また、スライドブッシュを設けることにより、シール装置から軸受を不要とすることができ、シール装置の軸方向長さを短くできとともに径方向の寸法を軸受寸法に左右されることなく自由に設計することができる。
さらに、スライドブッシュ固定する部材を磁気回路を形成する磁気伝達部材と共有化することで、スペースを有効活用でき、軸方向長さのコンパクト化に寄与することができる。
前記ハウジングと前記シャフトとの間に配置されて前記シャフトの周囲において磁力を発生する磁力発生手段と、
前記ハウジングから前記シャフトに向かって突出しており、前記シャフトを取り囲むシーリング溝を形成する一対の内方突縁を有し、前記磁力発生手段の一側に隣接して配置されて当該磁力発生手段で発生される磁力を伝達する第1の磁気伝達部材および前記ハウジングから前記シャフトに向かって突出する内方突縁を有し、前記磁力発生手段の他側に隣接して配置されて当該磁力発生手段で発生される磁力を伝達する第2の磁気伝達部材と、
前記第2の磁気伝達部材の内方突縁とシャフトとの間に配置されて前記シャフトの外周面に対してごく僅かな隙間を有するようにして前記内方突縁に固定されたスライドブッシュと、
少なくとも一部が前記シャフトに向かってはみ出した状態で前記シーリング溝に収納され、前記シャフトの外周面に対して摺動するシール部材と、
前記磁力発生手段により発生された磁力により前記シャフトと前記磁気伝達部材の間に保持される磁性流体と
を有し、前記第1の磁気伝達部材の一対の内方突縁のうち前記磁力発生手段に近接する第1内方突縁における前記シャフトに近接する端部には、前記シャフトおよび前記シール部材に向かって突出する流体保持突部が形成されていることを特徴としている。
また、スライドブッシュを設けることにより、シール装置から軸受を不要とすることができ、シール装置の軸方向長さを短くできとともに径方向の寸法を軸受寸法に左右されることなく自由に設計することができる。
さらに、スライドブッシュ固定する部材を磁気回路を形成する磁気伝達部材と共有化することで、スペースを有効活用でき、軸方向長さのコンパクト化に寄与することができる。
前記ハウジングと前記シャフトとの間に配置されて前記シャフトの周囲において磁力を発生する磁力発生手段と、
前記ハウジングから前記シャフトに向かって突出して前記シャフトを取り囲むシーリング溝を形成する一対の内方突縁を有し、前記磁力発生手段の一側に隣接して配置されて当該磁力発生手段で発生される磁力を伝達する第1の磁気伝達部材および前記ハウジングから前記シャフトに向かって突出する内方突縁を有し、前記磁力発生手段の他側に隣接して配置されて当該磁力発生手段で発生される磁力を伝達する第2の磁気伝達部材と、
前記第2の磁気伝達部材の内方突縁とシャフトとの間に配置されて前記シャフトの外周面に対してごく僅かな隙間を有するようにして前記内方突縁に固定されたスライドブッシュと、
少なくとも一部が前記シャフトに向かってはみ出した状態で前記シーリング溝に収納され、前記シャフトの外周面に対して摺動するシール部材と、
前記磁力発生手段により発生された磁力により前記シャフトと前記磁気伝達部材の間に保持される磁性流体と
を有し、前記シーリング溝は、アリ溝形状を有していることを特徴としている。
また、スライドブッシュを設けることにより、シール装置から軸受を不要とすることができ、シール装置の軸方向長さを短くできとともに径方向の寸法を軸受寸法に左右されることなく自由に設計することができる。
さらに、スライドブッシュ固定する部材を磁気回路を形成する磁気伝達部材と共有化することで、スペースを有効活用でき、軸方向長さのコンパクト化に寄与することができる。
(1)断面の形状が略矩形形状であるシーリング溝に、矩形形状の頂点のそれぞれに向かって突出する突起部を有するシール部材が収納されてため、シール部材における突起部のうち、シャフト側に突出してシャフトに対する摺動面を構成する2つの突起部は、磁性流体が多く固定される磁気伝達部材の先端部と近接した状態で配置されることになり、磁性伝達部材に保持される磁性流体と、シール部材の摺動面の距離が短くなり、磁性流体がシール部材の摺動面まで容易に到達できるので、磁性流体はシャフトとシール部材の摺動面近傍において潤滑剤として好適に作用し、シール部材の摺動寿命を長くすることができる。
また、スライドブッシュを設けることにより、シール装置から軸受を不要とすることができ、シール装置の軸方向長さを短くできとともに径方向の寸法を軸受寸法に左右されることなく自由に設計することができる。
さらに、スライドブッシュ固定する部材を磁気回路を形成する磁気伝達部材と共有化することで、スペースを有効活用でき、軸方向長さのコンパクト化に寄与することができる。
また、スライドブッシュを設けることにより、シール装置から軸受を不要とすることができ、シール装置の軸方向長さを短くできとともに径方向の寸法を軸受寸法に左右されることなく自由に設計することができる。
さらに、スライドブッシュ固定する部材を磁気回路を形成する磁気伝達部材と共有化することで、スペースを有効活用でき、軸方向長さのコンパクト化に寄与することができる。
また、スライドブッシュを設けることにより、シール装置から軸受を不要とすることができ、シール装置の軸方向長さを短くできとともに径方向の寸法を軸受寸法に左右されることなく自由に設計することができる。
さらに、スライドブッシュ固定する部材を磁気回路を形成する磁気伝達部材と共有化することで、スペースを有効活用でき、軸方向長さのコンパクト化に寄与することができる。
図1は、本発明の実施形態1に係るシール装置1を表す断面図である。
シール装置1は、処理室20に設けられたフランジ21の開口22を塞ぐように配置されており、処理室20内部を処理室外部に対して気密状態に保つことができる。開口22にはシャフト25を支持するための軸受23が設けられている。
本実施形態に係るシール装置1が配置される処理室20としては、特に限定されないが、例えばシリコンウェーハの処理を行うウェーハ処理室や、真空状態と大気圧状態とを繰り返すロードロック室等が挙げられる。また、処理室内部は、処理室外部に対して負圧環境に保持されるものであっても良く、また、等圧もしくは加圧環境に保持されるものであってもよい。
第1内方突縁8aと第2内方突縁8bは、互いに略対称な形状を有しており、第1内方突縁8aと第2内方突縁8bとの間には、シャフト25側に開口を有するシーリング溝11が形成されている。シャフト25の回転中心Aを通る断面によって観察したシーリング溝11の断面は、略矩形形状を有している。
図2は、本発明の実施形態2に係るシール装置15を表す正面断面図である。
実施の形態2に係るシール装置15は、第1磁極部材16の形状と、シール部材として用いられるOリング17の形状が、実施の形態1に係るシール装置1に備えられた第1磁極部材4およびXリング6の形状と異なる。しかし、その他の部分は実施の形態1に係るシール装置1と同様であり、実施の形態1と同様の部材には、実施の形態1と同じ部材番号を付している。
図3は、本発明の実施形態3に係るシール装置30を表す正面断面図である。
実施の形態3に係るシール装置30は、第1および第2磁極部材4、5と対向するシャフト25の外周面の部分にスリーブ31を嵌合させた点が実施の形態1に係るシール装置1と異なる。しかし、その他の部分は実施の形態1に係るシール装置1とほぼ同様であり、実施の形態と1と同様の部材には、実施の形態1と同じ部材番号を付している。
スリーブ31の内周面側には、シャフト外周面25aに向けて開口した環状のOリング溝32が設けられており、このOリング溝32に環状のOリング33が装着され、スリーブ31の内周面とシャフト外周面25aとの間をシールしている。
本実施の形態のシール装置30においては、スリーブ31を設けることにより、先願発明の場合のようにシャフト25を含めて納入する必要がなくなり、シャフトを含まないシール装置30だけ納入すれば足り、シール装置の交換の場合もシャフトを交換することなくシール装置30のみを交換すればよい。また、シール装置30は、既存のシャフトにも使用可能であり、完全なカートリッジタイプのシール装置を構成する。
図4は、本発明の実施形態4に係るシール装置40を表す正面断面図である。
実施の形態4に係るシール装置40は、第1および第2磁極部材16、5と対向するシャフト25の外周面の部分にスリーブ31を嵌合させた点が実施の形態2に係るシール装置15と異なる。しかし、その他の部分は実施の形態2に係るシール装置15とほぼ同様であり、実施の形態と2と同様の部材には、実施の形態15と同じ部材番号を付している。また、スリーブ31およびOリング33については、実施の形態3と同様であり、説明は省略する。
2 ハウジング
3 磁石
4 第1磁極部材(実施の形態1および3)
5 第2磁極部材
6 Xリング
7 磁性流体
8a 第1磁極部材4の第1内方突縁
8b 第1磁極部材4の第2内方突縁
9 ボルト
10 静的シール部材
11 シーリング溝(実施の形態1および3)
12 スライドブッシュ
14 シーリング溝(実施の形態2および4)
15 シール装置(実施の形態2)
16 第1磁極部材(実施の形態2および4)
17 Oリング
18a 第1磁極部材16の第1内方突縁
18b 第1磁極部材16の第2内方突縁
19 流体保持突部
20 処理室
21 フランジ
22 開口
23 軸受
25 シャフト
30 シール装置(実施の形態3)
31 スリーブ
32 Oリング溝
33 Oリング
40 シール装置(実施の形態4)
Claims (4)
- 所定の環境に保持される処理室の内部に、当該処理室の外部から当該処理室の環境を維持しつつ所定の機械的運動を伝達するシャフトのシール装置であって、
前記シャフトが貫通するハウジングと、
前記ハウジングと前記シャフトとの間に配置されて前記シャフトの周囲において磁力を発生する磁力発生手段と、
前記ハウジングから前記シャフトに向かって突出して前記シャフトを取り囲むシーリング溝を形成する一対の内方突縁を有し、前記磁力発生手段の一側に隣接して配置されて当該磁力発生手段で発生される磁力を伝達する第1の磁気伝達部材および前記ハウジングから前記シャフトに向かって突出する内方突縁を有し、前記磁力発生手段の他側に隣接して配置されて当該磁力発生手段で発生される磁力を伝達する第2の磁気伝達部材と、
前記第2の磁気伝達部材の内方突縁とシャフトとの間に配置されて前記シャフトの外側面に対してごく僅かな隙間を有するようにして前記内方突縁に固定されたスライドブッシュと、
少なくとも一部が前記シャフトに向かってはみ出した状態で前記シーリング溝に収納され、前記シャフトの外周面に対して摺動するシール部材と、
前記磁力発生手段により発生された磁力により前記シャフトと前記磁気伝達部材の間に保持される磁性流体と
を有し、前記シーリング溝は、前記シャフトの中心軸を通る断面の形状が略矩形形状であり、
前記シール部材は、前記シーリング溝の前記略矩形形状の頂点のそれぞれに向かって突出する4つの突起部を有しており、前記突起部のうち前記シャフト側に向かって突出する2つの突起部の間には、前記磁性流体を保持する流体保持溝が形成されていることを特徴とするシール装置。 - 所定の環境に保持される処理室の内部に、当該処理室の外部から当該処理室の環境を維持しつつ所定の機械的運動を伝達するシャフトのシール装置であって、前記シャフトが貫通するハウジングと、
前記ハウジングと前記シャフトとの間に配置されて前記シャフトの周囲において磁力を発生する磁力発生手段と、
前記ハウジングから前記シャフトに向かって突出しており、前記シャフトを取り囲むシーリング溝を形成する一対の内方突縁を有し、前記磁力発生手段の一側に隣接して配置されて当該磁力発生手段で発生される磁力を伝達する第1の磁気伝達部材および前記ハウジングから前記シャフトに向かって突出する内方突縁を有し、前記磁力発生手段の他側に隣接して配置されて当該磁力発生手段で発生される磁力を伝達する第2の磁気伝達部材と、
前記第2の磁気伝達部材の内方突縁とシャフトとの間に配置されて前記シャフトの外周面に対してごく僅かな隙間を有するようにして前記内方突縁に固定されたスライドブッシュと、
少なくとも一部が前記シャフトに向かってはみ出した状態で前記シーリング溝に収納され、前記シャフトの外周面に対して摺動するシール部材と、
前記磁力発生手段により発生された磁力により前記シャフトと前記磁気伝達部材の間に保持される磁性流体と
を有し、前記第1の磁気伝達部材の一対の内方突縁のうち前記磁力発生手段に近接する第1内方突縁における前記シャフトに近接する端部には、前記シャフトおよび前記シール部材に向かって突出する流体保持突部が形成されていることを特徴とするシール装置。 - 所定の環境に保持される処理室の内部に、当該処理室の外部から当該処理室の環境を維持しつつ所定の機械的運動を伝達するシャフトのシール装置であって、前記シャフトが貫通するハウジングと、
前記ハウジングと前記シャフトとの間に配置されて前記シャフトの周囲において磁力を発生する磁力発生手段と、
前記ハウジングから前記シャフトに向かって突出して前記シャフトを取り囲むシーリング溝を形成する一対の内方突縁を有し、前記磁力発生手段の一側に隣接して配置されて当該磁力発生手段で発生される磁力を伝達する第1の磁気伝達部材および前記ハウジングから前記シャフトに向かって突出する内方突縁を有し、前記磁力発生手段の他側に隣接して配置されて当該磁力発生手段で発生される磁力を伝達する第2の磁気伝達部材と、
前記第2の磁気伝達部材の内方突縁とシャフトとの間に配置されて前記シャフトの外周面に対してごく僅かな隙間を有するようにして前記内方突縁に固定されたスライドブッシュと、
少なくとも一部が前記シャフトに向かってはみ出した状態で前記シーリング溝に収納され、前記シャフトの外周面に対して摺動するシール部材と、
前記磁力発生手段により発生された磁力により前記シャフトと前記磁気伝達部材の間に保持される磁性流体と
を有し、前記シーリング溝は、アリ溝形状を有していることを特徴とするシール装置。 - 前記第1および第2磁極部材と対向するシャフトの外周面の部分にスリーブを嵌合させることを特徴とする請求項1ないし3のいずれか1項に記載のシール装置。
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2010
- 2010-06-14 WO PCT/JP2010/060016 patent/WO2011036920A1/ja active Application Filing
- 2010-06-14 KR KR1020107029625A patent/KR20120062582A/ko not_active Application Discontinuation
- 2010-06-14 JP JP2010546758A patent/JPWO2011036920A1/ja active Pending
- 2010-06-14 US US13/122,953 patent/US8328199B2/en not_active Expired - Fee Related
- 2010-06-14 CN CN201080001858XA patent/CN102216658A/zh active Pending
- 2010-06-23 TW TW099120418A patent/TW201120979A/zh unknown
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CN103234051A (zh) * | 2013-04-14 | 2013-08-07 | 丹东克隆集团有限责任公司 | 泵用磁力式水封机构 |
KR101572899B1 (ko) | 2014-07-02 | 2015-12-01 | 현대로템 주식회사 | 기어박스 마운팅 어셈블리 |
Also Published As
Publication number | Publication date |
---|---|
CN102216658A (zh) | 2011-10-12 |
US20110198814A1 (en) | 2011-08-18 |
KR20120062582A (ko) | 2012-06-14 |
TW201120979A (en) | 2011-06-16 |
JPWO2011036920A1 (ja) | 2013-02-14 |
US8328199B2 (en) | 2012-12-11 |
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