WO2004079197A1 - 真空ポンプ - Google Patents
真空ポンプ Download PDFInfo
- Publication number
- WO2004079197A1 WO2004079197A1 PCT/JP2004/002360 JP2004002360W WO2004079197A1 WO 2004079197 A1 WO2004079197 A1 WO 2004079197A1 JP 2004002360 W JP2004002360 W JP 2004002360W WO 2004079197 A1 WO2004079197 A1 WO 2004079197A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pair
- screw
- vacuum pump
- shaft
- shafts
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
- F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
- F04C27/009—Shaft sealings specially adapted for pumps
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S277/00—Seal for a joint or juncture
- Y10S277/935—Seal made of a particular material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S277/00—Seal for a joint or juncture
- Y10S277/935—Seal made of a particular material
- Y10S277/936—Composite
Definitions
- the present invention relates to a vacuum pump, and more particularly, to a vacuum pump suitable for manufacturing semiconductors.
- Non-Patent Document 1 In the field of manufacturing semiconductor wafers, vacuum pumps have been used.
- a screw pump is used as the vacuum pump.
- the screw pump is disclosed as a screw pump in Non-Patent Document 1 below, for example.
- Non-patent Document 1 Physics Dictionary Editing Committee, “Physics Dictionary,” Baifukan, published on May 20, 1992, p.
- the screw pump is generally composed of a first screw having a plurality of spiral land portions (a male screw having a convex thread) and a second screw having a plurality of spiral grooves.
- a pair of screw rotors which rotate around two substantially parallel axes while meshing with each other, and a casing for accommodating the pair of screw rotors.
- the sing is provided with a suction port and a discharge port.
- the first screw hole male rotor having a convex screw thread
- the first screw hole also has a plurality of spiral land portions as well as a plurality of spiral land portions. It can also be said that it has a plurality of spiral land portions and a plurality of spiral groove portions.
- the second screw rotor (female rotor having a concave thread groove) also has a plurality of spiral land portions as well as a plurality of spiral groove portions. And a plurality of spiral grooves.
- a pair of shafts that support a pair of screw rotors are provided with a pair of bearings and a pair of shaft seals.
- the present invention has been made to solve such a problem, and an object of the present invention is to provide a vacuum pump provided with a shaft seal that ensures smooth operation without being corroded by corrosive gas. Is what you do.
- the vacuum pump according to the present invention is as follows.
- a vacuum pump comprising: a pair of screw rotors for rotating a pair of screws; a casing for accommodating the pair of screw openings; and a pair of bearings provided on a pair of shafts supporting the pair of screw holes.
- a pair of shaft seals that are not in contact with the pair of shafts during normal operation are provided between the pair of screw openings and the pair of bearings, and each of the pair of shaft seals is static.
- a vacuum pump which is a pressure shaft seal, wherein a seal gas is introduced between the shaft seal and the shaft from the shaft seal portion.
- each of the pair of shaft seals has a porous member.
- the pair of shaft seals is provided between the pair of screw screws and the pair of bearings.
- a pair of shaft seal members that are not in contact with the shaft during normal operation, and each inner surface of the pair of shaft seal members tapers as the distance from each of the pair of screw rotors increases;
- a vacuum pump having a tapered surface, and a bearing housing formed on a bearing side of each of the pair of shaft seal members.
- a vacuum pump comprising: a pair of screws for rotating the screw; a casing for accommodating the pair of screw rotors; and a pair of bearings provided on a pair of shafts for supporting the pair of screw euros.
- a pair of shaft seals that are in non-contact with the pair of shafts during a steady operation of the screw euro overnight between the pair of screw openings and the pair of bearings; and the pair of shaft seals.
- each of the shaft seal members of the pair of shaft seals is formed with a taper surface that tapers as the distance from each of the pair of screw rotors increases.
- a vacuum pump having a bearing housing formed therein.
- each of the pair of shaft seals has a porous portion as a shaft seal member.
- FIG. 1 is a sectional view of a screw pump according to one embodiment of the present invention.
- FIG. 2 is a sectional view of a pair of screw ports of the screw pump shown in FIG.
- FIG. 3 is a cross-sectional view taken along the line B in FIG.
- FIG. 4 is a sectional view showing a shaft seal of the screw pump shown in FIG.
- FIG. 5 is a sectional view of a modified example of a shaft seal that can be used in the screw pump of the present invention.
- FIG. 6 is a sectional view showing another modified example of the shaft seal that can be used in the screw pump of the present invention.
- FIG. 7 is a sectional view showing still another modified example of the shaft seal that can be used in the screw pump of the present invention.
- FIG. 1 a screw pump main body A is provided with a pair of screw rotors 1 and 2.
- screw rotor 1 is a first screw rotor (male rotor) having a plurality of spiral land portions (convex threads) 1a.
- the second screw row having a plurality of spiral grooves (concave screw grooves) 2a (Female rotor).
- screw rows 1 and 2 are housed in a casing 3 and are rotated by a pair of bearings 11 on one end of a pair of shafts 4 supporting screw euros 1 and 2. Supported as possible.
- a timing gear 6 is attached to the one end of the shaft 4, and the pair of screw rotors 1 and 2 are configured to be synchronously rotated via the timing gear 6.
- a suction port 7 is formed at the opposite end of the casing 3 for housing the pair of screw rotors 1 and 2, and one end of the casing 3
- a discharge port 8 (Fig. 3) is formed in the vacuum pump.
- a vacuum pump that draws gas from the suction port 7 and exhausts gas from the discharge port 8 by rotating the screw rotors 1 and 2 in synchronization with each other is provided. It is configured to operate.
- a cavity 9 is formed on the discharge port 8 side of the casing 3 so as to circulate cooling water, and a jacket 9 is formed on the discharge port 8 side. It is configured to be able to cool.
- a cover 10 is attached to one end of the casing 3 for housing the screw rotors 1 and 2, and one of the shafts 4 supporting one of the screw rotors 1 is connected to the cover 10 by the cover 10. It protrudes and is configured to be directly connected to the rotating shaft of the motor described later. Further, a shaft seal 5 is provided between the screw rotor 1 and the bearing (bearing) 11, and between the screw rotor 2 and the bearing (bearing) 11.
- the bearing 5 is a static pressure shaft seal, and an inert gas such as nitrogen gas is introduced into the shaft seal interior 52 from the through hole 51 at a predetermined pressure.
- an inert gas such as nitrogen gas is introduced into the shaft seal interior 52 from the through hole 51 at a predetermined pressure.
- two shaft seal members 53a and 53b made of a porous material such as carbon are accommodated inside the shaft seal 52.
- the two shaft seal members 53a and 53b are combined with each other.
- the two shaft seal members 53a and 53b are sealed so that the two shaft seal members 53a and 53b are housed in the shaft seal inside 52 without any gap.
- a leaf spring 54 is provided for urging in the direction in which the shaft 4 extends.
- the porosity of the porous members of the shaft seal members 53a and 53b is 1% to 20%, and the mechanical strength (bending strength) is 20 MPa to 100 MPa.
- the pressure of the inert gas such as nitrogen gas introduced into the shaft seal 52 is preferably from 0.01 MPa to 0.5 MPa.
- the shaft seal members 53a and 53b are made of a porous member, and the high-pressure inert gas passes between the shaft 4 and the shaft seal members 53a and 53b, Not only does it flow to the bearing side (bearing side), but part of it also flows to the screw side (pump side), which is the pressure reducing side.
- the shaft seal member may come into contact with the shaft (shaft) at the start of operation or before the inflow of the seal gas, but at least during normal operation, the shaft seal member does not contact the shaft (shaft). It is.
- Fig. 5 shows that the shaft seal member 53 is an integral shaft seal member, gas leakage from the side is prevented by the O-ring 56 through the spacer 55, and the seal gas that has passed through the shaft seal member 53 is used. Since the ring is formed around the shaft (shaft) 4, the clearance between the shaft (shaft) 4 and the shaft sealing member 53 can be reduced.
- the shaft seal member 57 need not be a porous member, but if it is not a porous member, a seal gas inlet 58 must be provided.
- the inner surface of the shaft seal member 57 is separated from the screw rotor (pump). A so-called tapered surface 57a is formed.
- the seal gas inlet 58 is provided at a position where the reverse diffusion does not occur between the screw rotor side (pump side) and the bearing side (bearing side).
- a bearing (bearing) housing is provided on the bearing side (bearing side) of the shaft seal member 57.
- the taper surface 57 a is formed on the inner surface of the shaft seal member 57, even if the shaft 4 shakes due to the bearing (bearing), the shaft 4 and the shaft seal member 5 7 a Without contact, the seal function is maintained and smooth rotation is possible.
- a shaft seal that greatly reduces the consumption of seal gas, facilitates gas recovery without being corroded by corrosive gas, and ensures smooth operation is provided.
- a vacuum pump can be obtained.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Sealing Of Bearings (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04715461A EP1607633A1 (en) | 2003-03-03 | 2004-02-27 | Vacuum pump |
US10/547,694 US7500838B2 (en) | 2003-03-03 | 2004-02-27 | Vacuum pump with a pair of screw rotors |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-055225 | 2003-03-03 | ||
JP2003055225A JP4578780B2 (ja) | 2003-03-03 | 2003-03-03 | 真空ポンプ |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004079197A1 true WO2004079197A1 (ja) | 2004-09-16 |
Family
ID=32958655
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/002360 WO2004079197A1 (ja) | 2003-03-03 | 2004-02-27 | 真空ポンプ |
Country Status (5)
Country | Link |
---|---|
US (1) | US7500838B2 (ja) |
EP (1) | EP1607633A1 (ja) |
JP (1) | JP4578780B2 (ja) |
TW (1) | TWI373560B (ja) |
WO (1) | WO2004079197A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4558349B2 (ja) * | 2004-03-02 | 2010-10-06 | 財団法人国際科学振興財団 | 真空ポンプ |
NO330109B1 (no) | 2008-02-07 | 2011-02-21 | Statoilhydro Asa | Opplagringssystem for rotor i roterende maskiner |
JP5414345B2 (ja) * | 2009-04-28 | 2014-02-12 | 三菱電機株式会社 | 二段スクリュー圧縮機 |
WO2014040641A1 (en) | 2012-09-14 | 2014-03-20 | Statoil Petroleum As | Bearing system for rotor in rotating machines |
JP6430718B2 (ja) * | 2014-05-12 | 2018-11-28 | 株式会社荏原製作所 | 真空ポンプ装置 |
WO2016011789A1 (zh) * | 2014-07-21 | 2016-01-28 | 摩尔动力(北京)技术股份有限公司 | 端面密封系统 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62184191U (ja) * | 1986-05-16 | 1987-11-21 | ||
JPS63285279A (ja) * | 1987-05-15 | 1988-11-22 | Hitachi Ltd | 真空ポンプの軸封装置 |
JPH11270482A (ja) * | 1998-03-20 | 1999-10-05 | Dia Shinku Kk | 真空ポンプ |
JP2000213488A (ja) * | 1999-01-25 | 2000-08-02 | Teijin Seiki Co Ltd | 軸封機構および真空ポンプ |
JP2001056027A (ja) * | 1999-08-13 | 2001-02-27 | Toshiba Mach Co Ltd | 静圧気体軸受 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5951190A (ja) * | 1982-09-17 | 1984-03-24 | Hitachi Ltd | オイルフリ−スクリユ−圧縮機の油切り装置 |
JPS62184191A (ja) | 1986-02-07 | 1987-08-12 | 関東レザ−株式会社 | 凹凸模様を有する結露防止壁紙の製造方法 |
JPS62243982A (ja) * | 1986-04-14 | 1987-10-24 | Hitachi Ltd | 2段型真空ポンプ装置およびその運転方法 |
SE8701123L (sv) * | 1987-03-19 | 1988-09-20 | Svenska Rotor Maskiner Ab | Skruvrotormaskin |
JPS6429690A (en) * | 1987-07-22 | 1989-01-31 | Hitachi Ltd | Shaft sealing device for screw vacuum pump |
US4781553A (en) * | 1987-07-24 | 1988-11-01 | Kabushiki Kaisha Kobe Seiko Sho | Screw vacuum pump with lubricated bearings and a plurality of shaft sealing means |
JPH0615176Y2 (ja) * | 1987-10-05 | 1994-04-20 | 日本エスケイエフ株式会社 | 気体シール装置 |
JPH0289812A (ja) * | 1988-09-26 | 1990-03-29 | Ibiden Co Ltd | 静圧気体軸受 |
JPH0348015A (ja) * | 1989-07-14 | 1991-03-01 | Canon Inc | 流体軸受 |
JP2886054B2 (ja) * | 1993-10-01 | 1999-04-26 | 光洋精工株式会社 | 静圧軸受装置 |
UA43456C2 (uk) * | 1997-03-26 | 2001-12-17 | Закритоє Акціонєрноє Общєство "Нєзавісімая Енєргєтіка" | Парова гвинтова машина |
-
2003
- 2003-03-03 JP JP2003055225A patent/JP4578780B2/ja not_active Expired - Fee Related
-
2004
- 2004-02-27 EP EP04715461A patent/EP1607633A1/en not_active Withdrawn
- 2004-02-27 WO PCT/JP2004/002360 patent/WO2004079197A1/ja active Application Filing
- 2004-02-27 US US10/547,694 patent/US7500838B2/en not_active Expired - Fee Related
- 2004-03-02 TW TW093105431A patent/TWI373560B/zh not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62184191U (ja) * | 1986-05-16 | 1987-11-21 | ||
JPS63285279A (ja) * | 1987-05-15 | 1988-11-22 | Hitachi Ltd | 真空ポンプの軸封装置 |
JPH11270482A (ja) * | 1998-03-20 | 1999-10-05 | Dia Shinku Kk | 真空ポンプ |
JP2000213488A (ja) * | 1999-01-25 | 2000-08-02 | Teijin Seiki Co Ltd | 軸封機構および真空ポンプ |
JP2001056027A (ja) * | 1999-08-13 | 2001-02-27 | Toshiba Mach Co Ltd | 静圧気体軸受 |
Also Published As
Publication number | Publication date |
---|---|
TW200506206A (en) | 2005-02-16 |
EP1607633A1 (en) | 2005-12-21 |
US7500838B2 (en) | 2009-03-10 |
TWI373560B (en) | 2012-10-01 |
US20060188383A1 (en) | 2006-08-24 |
JP2004263627A (ja) | 2004-09-24 |
JP4578780B2 (ja) | 2010-11-10 |
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