EP1927758A1 - Machine fonctionnant à l'aide d'un fluide dépourvu d'huile ayant deux rotors ou plus - Google Patents

Machine fonctionnant à l'aide d'un fluide dépourvu d'huile ayant deux rotors ou plus Download PDF

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Publication number
EP1927758A1
EP1927758A1 EP07022875A EP07022875A EP1927758A1 EP 1927758 A1 EP1927758 A1 EP 1927758A1 EP 07022875 A EP07022875 A EP 07022875A EP 07022875 A EP07022875 A EP 07022875A EP 1927758 A1 EP1927758 A1 EP 1927758A1
Authority
EP
European Patent Office
Prior art keywords
fluid machine
rotors
oil
rotor
gears
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07022875A
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German (de)
English (en)
Inventor
Shiro Tanigawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anest Iwata Corp
Original Assignee
Anest Iwata Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anest Iwata Corp filed Critical Anest Iwata Corp
Publication of EP1927758A1 publication Critical patent/EP1927758A1/fr
Withdrawn legal-status Critical Current

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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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
    • F04C29/005—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/126—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type

Definitions

  • the present invention relates to oil-free fluid machines having two or more rotors, specifically to dry-sealed mechanical vacuum pumps such as Roots type, screw type, and claw type vacuum pumps having two or more rotors which are rotated in synchronism with one another to perform well-balanced torque transmission without a need for lubrication oil for lubricating the drive mechanism of the rotors thereby eliminating occurrence of oil contamination.
  • dry-sealed mechanical vacuum pumps such as Roots type, screw type, and claw type vacuum pumps having two or more rotors which are rotated in synchronism with one another to perform well-balanced torque transmission without a need for lubrication oil for lubricating the drive mechanism of the rotors thereby eliminating occurrence of oil contamination.
  • Fluid machines having two or more counter-rotating meshed lobed rotors accommodated in a rotor casing to expel air trapped in a space between the wall of the casing and the rotor surface by rotating the rotors in synchronization with one another are widely used as vacuum pumps such as roots vacuum pumps, claw vacuum pumps, and screw vacuum pumps.
  • synchronization gears made of metal is usually adapted to allow meshing lobed rotors to rotate in directions opposite to each other.
  • the synchronization gears made of metal are needed to be lubricated with oil, grease, or a solid lubricant, etc. Further, noise occurs due to contact meshing of the synchronization gears.
  • Lubrication of the synchronization gears is performed with oil, grease, or a solid lubricant, etc.
  • Oil lubrication deteriorates quality of vacuum.
  • grease may be used, but refilling of grease is not easy.
  • Solid lubricants are not adequate when the gears experience large loads. Grease is poor in friction heat removing performance, and solid lubricants can not remove friction heat.
  • lubricating oil is reserved in a gear case and supplied to where needed when operating the vacuum pump, there are problems that oil leaks through oil seals of drive shafts of the rotors. Particularly, oil molecules leaked to the pump chamber defuse into the vessel to be evacuated and deteriorate quality of vacuum.
  • Patent literature 1 a dry mechanical vacuum pump of roots type, in which an annular magnet is attached to an end of the drive shaft of a drive motor and to an end of one of the rotary shaft respectively, and a partition member made of electrical insulating material is provided to run in the gap between the outer periphery and inner periphery of the annular magnets so that the pump body side where the annular magnet attached to the rotary shaft exists is separated from the outside of the pump body where the annular magnet attached to the drive shaft of the motor exists.
  • Synchronization gears consisting of a metal gear and a plastic gear for allowing the two rotors to rotate in direction opposite to each other in synchronization with each other are provided at the other ends of the rotary shafts respectively.
  • lubricating oil for lubricating the synchronization gears is not needed, oil seals for preventing oil leak from the gear chamber to the pump chamber and for preventing oil leak from the gear chamber to outside are eliminated, and power loss due friction is decreased.
  • an oil-free fluid machine unit including an oil-free fluid machine, a motor connected to one of rotor shafts of the fluid machine, and a mounting base for mounting the fluid machine and the motor, the fluid machine having a rotor casing and two or more lobed rotors accommodated in the rotor casing rotatably to expel gas trapped in pockets formed between the lobes and the rotor casing as the rotors rotate, in which a pulley is attached to each of said rotor shafts at an end opposite to the motor side end thereof, a belt being looped over pulleys attached to adjacent rotor shafts so that pulleys attached to adjacent rotor shafts are rotated in counter direction to each other; and synchronization gears are attached to the other ends of the rotor shafts respectively, at least one of the synchronization gears being made of plastic material; thereby enabling torque transmission between the rotors in two ways, via belt driving and via synchronization gear drive
  • an idler pulley is provided to allow pulleys attached to adjacent rotor shafts respectively to be rotated in counter direction to each other by looping a belt over the adjacent pulleys via the idler pulley.
  • torque transmission between the rotors is carried out in two ways, via synchronization gear drive and via belt drive, load torque exerting on the synchronization gears is reduced, and plastic gear or gears can be adopted for the synchronization gears, resulting in requiring no lubricant to lubricate the synchronization gears and prolonged operation life of the synchronization gears. Therefore, by adopting the drive transmission mechanism in an oil-free fluid machine, contamination with lubricating oil can be eliminated, and particularly a dry mechanical vacuum pump unit of high efficiency which can produce oil-free vacuum can be provided.
  • FIG. 1A is a plan view of the oil-free fluid machine composed as a dry mechanical vacuum pump of roots type equipped with the drive transmission mechanism according to the present invention
  • FIG.1B is a front view thereof
  • FIG.1C is a side view thereof.
  • FIG. 2 A is a sectional view along line A-A in FIG.1A
  • FIG. 2B is a cross sectional view along Line C-C in FIG.1A .
  • FIG. 1A is a plan view of the oil-free fluid machine composed as a dry mechanical vacuum pump of roots type equipped with the drive transmission mechanism according to the present invention
  • FIG.1B is a side view thereof
  • FIG.1C is a front view thereof
  • FIG. 2A is a sectional view along line A-A in FIG. 1A
  • FIG.2B is a cross sectional view along Line C-C in FIG.1A .
  • the drive transmission mechanism applied to the fluid machine of the invention can be applied to any of fluid machines having two or more counter-rotating meshed lobed rotors accommodated in a rotor casing parallel to one another to be rotated in synchronization with one another and torque transmission between the rotors is performed unlubricated condition, so applicable also to screw vacuum pumps and claw vacuum pumps.
  • reference numeral 10 is a dry mechanical vacuum roots pump
  • 11 is a drive motor for driving the vacuum pump
  • 12 is a driving shaft of the drive motor
  • Reference numeral 13 is a coupling for connecting the driving shaft 12 of the drive motor 11 to an end of a rotor shaft 14 of the vacuum pump
  • 15 is the other rotor shaft.
  • Reference numeral 16 and 17 are pulleys over which a belt 26 is looped to transmit torque transmitted to the rotor shaft 14 to another rotor shaft 15.
  • Reference numerals 18 and 19 are synchronization gears attached to the other end of the rotor shafts 14 and 15 respectively meshing with each other to allow synchronized rotation of the rotor shafts 14 and 15 in direction opposite to each other.
  • Reference numeral 20 is a mounting base for supporting the vacuum pump 10 and the drive motor 11 .
  • Reference numerals 21 and 22 are fixing means for fixing the vacuum pump 10 and the drive motor 11 to the mounting base 20.
  • Reference numerals 27 and 28 are an outlet port and intake port respectively.
  • a pair of three-lobes roots type rotors 102 and 103 are accommodated in a pump chamber 101 of a rotor casing 100.
  • the rotors 102 and 103 are integrated respectively with the rotary shafts 14 and 15 which are supported by oilless bearings not shown in the drawings.
  • the rotors 102 and 103 can be rotated without contact between lobe surfaces thereof and also without contact between the peripheries of the lobes and the wall surface of the pump chamber 101.
  • Fluid such as air is trapped in pockets 104 surrounding the lobes and carried from the intake port 28 side to the outlet port 27side and expelled from there as the rotors 102 and 103 rotate as shown by arrows 29 in FIG.2B .
  • the vacuum pump 10 is fixed to the mounting base 20 by means of the fixing means 21, and the driving shaft 12 of the motor 11 also fixed to the mounting base 20 is connected to the rotary shaft 14 by means of the coupling 13.
  • the synchronization gear 18 is attached to the rotor shaft 14 at the motor 11 side end thereof as shown in Fig. 2A , and to the other end side of the rotor shaft 14 is attached the pulley 16 as shown in Fig. 1B .
  • the synchronization gear 19 is attached to the rotor shaft 15 at the motor 11 side end thereof, and to the other end side of the rotor shaft 14 is attached the pulley 17.
  • the belt 26 is looped over the pulleys 16 and 17 via an idle pulley 25 so that the rotor shaft 14 and 15 rotate in counter direction to each other.
  • At least one of the synchronization gears 18 and 19 is made of plastics, and the other gear is made of plastics or metal. By using the plastic gear, lubricant for lubricating the meshing gears can be dispensed with.
  • Synchronized rotation of the rotors 14, 15 is secured by the synchronization gears 18 and 19 .
  • Torque transmission between the rotors is done in two ways, via the pulleys 16 and 17 and via the synchronization gears 18 and 19. For example, about 70% of torque is transmitted via the pulleys 16 and 17 and about 30% of torque is transmitted via the synchronization gears 18 and 19.
  • the drive transmission mechanism to transmit torque from a rotor shaft 14 to a rotor shaft 15 such that synchronization gears 18, 19 are attached to the rotor shafts 14, 15 respectively at an end side thereof and pulleys 16, 17 are attached to the other end side respectively with a belt 26 looping over the pulleys 16, 17 via a idler pulley 25 so that the pulleys rotate in counter direction to each other, a part of torque transmission is done via the synchronization gears 18, 19 and the remaining torque transmission is done via the pulleys 16, 17.
  • drive transmission mechanism increased in torque transmission capacity and longevity without a need of using lubrication oil is provided, and by adopting the drive transmission mechanism in a vacuum pump, an oil contamination free vacuum pump can be provided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
EP07022875A 2006-11-30 2007-11-26 Machine fonctionnant à l'aide d'un fluide dépourvu d'huile ayant deux rotors ou plus Withdrawn EP1927758A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006323961A JP2008138549A (ja) 2006-11-30 2006-11-30 ２軸以上の回転軸を配した無給油流体機械本体を有する無給油流体機械

Publications (1)

Publication Number Publication Date
EP1927758A1 true EP1927758A1 (fr) 2008-06-04

Family

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Family Applications (1)

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EP07022875A Withdrawn EP1927758A1 (fr) 2006-11-30 2007-11-26 Machine fonctionnant à l'aide d'un fluide dépourvu d'huile ayant deux rotors ou plus

Country Status (4)

Country Link
US (1) US20080131302A1 (fr)
EP (1) EP1927758A1 (fr)
JP (1) JP2008138549A (fr)
CN (1) CN101260885A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011124213A3 (fr) * 2010-04-08 2013-03-21 Netzsch Mohnopumpen Gmbh Pompe à pistons rotatifs et procédé de fonctionnement d'une pompe à pistons rotatifs
WO2020007665A1 (fr) * 2018-07-03 2020-01-09 Leybold Gmbh Pompe à vide à deux arbres ou plus

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008157446A (ja) * 2006-11-30 2008-07-10 Anest Iwata Corp ２軸以上の回転軸間の駆動力伝達機構と該駆動力伝達機構を用いた無給油流体機械
CN102146919A (zh) * 2010-12-21 2011-08-10 周建强 双转子闭合压缩机
CN102352843A (zh) * 2011-09-26 2012-02-15 江西隆恒科技有限公司 一种无油双螺杆压缩机
CN104389777B (zh) * 2014-11-21 2017-03-29 上海爱德特检测设备制造有限公司 机油泵测试装置
CN105889072A (zh) * 2016-06-25 2016-08-24 余林岚 一种应用于厌氧胶加工的抽真空机组
WO2019148007A1 (fr) * 2018-01-26 2019-08-01 Waterblasting, Llc Pompe pour matières thermoplastiques fondues

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176848A (en) * 1985-06-25 1987-01-07 Spectra Physics Sealed rotary compressor
JPH06185483A (ja) 1991-12-02 1994-07-05 Shinku Kiko Kk ドライメカニカルブースタポンプ
WO1995011385A1 (fr) * 1993-10-18 1995-04-27 Opcon Autorotor Ab Dispositif de raccordement d'une machine a rotors en forme de vis a une poulie motrice ou commandee

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3150593A (en) * 1961-04-24 1964-09-29 Waukesha Foundry Co Metering pump
US4717322A (en) * 1986-08-01 1988-01-05 Toyota Jidosha Kabushiki Kaisha Roots-type fluid machine
EP0409287B1 (fr) * 1987-05-15 1994-04-06 Leybold Aktiengesellschaft Pompe à vide avec espace de déplacement
KR100346820B1 (ko) * 1994-04-21 2002-11-30 가부시키 가이샤 에바라 세이사꾸쇼 다축전기모터 및 그에 결합된 용적형 진공펌프
DE10019066A1 (de) * 2000-04-18 2001-10-25 Leybold Vakuum Gmbh Vakuumpumpe mit zwei zusammenwirkenden Rotoren
JP2008157446A (ja) * 2006-11-30 2008-07-10 Anest Iwata Corp ２軸以上の回転軸間の駆動力伝達機構と該駆動力伝達機構を用いた無給油流体機械

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176848A (en) * 1985-06-25 1987-01-07 Spectra Physics Sealed rotary compressor
JPH06185483A (ja) 1991-12-02 1994-07-05 Shinku Kiko Kk ドライメカニカルブースタポンプ
WO1995011385A1 (fr) * 1993-10-18 1995-04-27 Opcon Autorotor Ab Dispositif de raccordement d'une machine a rotors en forme de vis a une poulie motrice ou commandee

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011124213A3 (fr) * 2010-04-08 2013-03-21 Netzsch Mohnopumpen Gmbh Pompe à pistons rotatifs et procédé de fonctionnement d'une pompe à pistons rotatifs
AU2011238240B2 (en) * 2010-04-08 2015-07-16 Netzsch Pumpen & Systeme Gmbh Rotary piston pump and method for operating a rotary piston pump
DE102010014218B4 (de) 2010-04-08 2018-09-13 Netzsch Pumpen & Systeme Gmbh Drehkolbenpumpe und Verfahren zum Betreiben einer Drehkolbenpumpe
WO2020007665A1 (fr) * 2018-07-03 2020-01-09 Leybold Gmbh Pompe à vide à deux arbres ou plus

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Publication number Publication date
US20080131302A1 (en) 2008-06-05
JP2008138549A (ja) 2008-06-19
CN101260885A (zh) 2008-09-10

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