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EP1304484A3 - Vacuum pump - Google Patents

Vacuum pump Download PDF

Info

Publication number
EP1304484A3
EP1304484A3 EP02023201A EP02023201A EP1304484A3 EP 1304484 A3 EP1304484 A3 EP 1304484A3 EP 02023201 A EP02023201 A EP 02023201A EP 02023201 A EP02023201 A EP 02023201A EP 1304484 A3 EP1304484 A3 EP 1304484A3
Authority
EP
European Patent Office
Prior art keywords
rotary shaft
pump chamber
oil
vacuum pump
pressure difference
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Withdrawn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
EP02023201A
Other languages
German (de)
French (fr)
Other versions
EP1304484A2 (en
Inventor
Ryosuke Koshizaka
Satoru Kuramoto
Masahiro Ida
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.)
Toyota Industries Corp
Original Assignee
Toyota Industries 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 Toyota Industries Corp filed Critical Toyota Industries Corp
Publication of EP1304484A2 publication Critical patent/EP1304484A2/en
Publication of EP1304484A3 publication Critical patent/EP1304484A3/en
Withdrawn legal-status Critical Current

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
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/06—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for stopping, starting, idling or no-load operation
    • 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
    • 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
    • F04C2240/00—Components
    • F04C2240/40—Electric motor
    • F04C2240/403—Electric motor with inverter for speed control

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

A vacuum pump has an oil housing (14), which defines a pump chamber (43) and an oil zone (331) adjacent to the pump chamber (43). A rotary shaft (19, 20) extends from the pump chamber (43) through the oil housing (14) and projects to the oil zone (331). A non-contact sealing element (67, 68, 72) is attached to the rotary shaft (19, 20) to integrally rotate with the rotary shaft (19, 20). The element (67, 68, 72) prevents oil from entering the pump chamber (43). The vacuum pump draws gas by operating a gas conveying body (23) in the pump chamber (43) through rotation of the rotary shaft (19, 20). When the rotary shaft (19, 20) shifts from an operation state to a stopped state, the pressure difference occurs between the pump chamber (43) and the oil zone (331). Rotation of the rotary shaft (19, 20) is controlled such that the pressure difference becomes maximum before the rotary shaft (19, 20) completely stops.
Figure 00000001
EP02023201A 2001-10-17 2002-10-16 Vacuum pump Withdrawn EP1304484A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001318893A JP3941452B2 (en) 2001-10-17 2001-10-17 Operation stop control method and operation stop control device for vacuum pump
JP2001318893 2001-10-17

Publications (2)

Publication Number Publication Date
EP1304484A2 EP1304484A2 (en) 2003-04-23
EP1304484A3 true EP1304484A3 (en) 2003-09-03

Family

ID=19136518

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02023201A Withdrawn EP1304484A3 (en) 2001-10-17 2002-10-16 Vacuum pump

Country Status (3)

Country Link
US (1) US20030072651A1 (en)
EP (1) EP1304484A3 (en)
JP (1) JP3941452B2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4702236B2 (en) * 2006-09-12 2011-06-15 株式会社豊田自動織機 Vacuum pump shutdown control method and shutdown control apparatus
JP4784484B2 (en) * 2006-11-02 2011-10-05 株式会社豊田自動織機 Electric pump
BRPI1100026A2 (en) * 2011-01-26 2013-04-24 Whirlpool Sa reciprocal compressor system and control method
US9902251B2 (en) * 2016-01-26 2018-02-27 Deere & Company Recess-mounted hydraulic pump cartridge and work vehicle drivetrain therewith
EP3575604B1 (en) * 2017-01-27 2024-05-01 Hitachi Industrial Equipment Systems Co., Ltd. Scroll compressor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1449257A (en) * 1965-10-05 1966-08-12 Dresser Ind Lubricant seal for positive displacement rotary pump
EP0674106A1 (en) * 1994-03-16 1995-09-27 Chemitec Co., Ltd. A multistage vacuum pump
EP1006281A1 (en) * 1998-12-04 2000-06-07 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Multi-stage roots pump

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2937807A (en) * 1956-12-26 1960-05-24 Heraeus Gmbh W C High vacuum pumps
JPS63129829A (en) 1986-11-14 1988-06-02 Nippon Denso Co Ltd Generator with vacuum pump
JPS6429690A (en) * 1987-07-22 1989-01-31 Hitachi Ltd Shaft sealing device for screw vacuum pump
JPH0311193A (en) 1989-06-08 1991-01-18 Daikin Ind Ltd Vacuum pump
US5028220A (en) * 1990-08-13 1991-07-02 Sullair Corpoation Cooling and lubrication system for a vacuum pump
US5356275A (en) * 1991-03-04 1994-10-18 Leybold Aktiengesellschaft Device for supplying a multi-stage dry-running vacuum pump with inert gas
JP3593365B2 (en) * 1994-08-19 2004-11-24 大亜真空株式会社 Variable helix angle gear
JP2001304115A (en) * 2000-04-26 2001-10-31 Toyota Industries Corp Gas feeding device for vacuum pump

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1449257A (en) * 1965-10-05 1966-08-12 Dresser Ind Lubricant seal for positive displacement rotary pump
EP0674106A1 (en) * 1994-03-16 1995-09-27 Chemitec Co., Ltd. A multistage vacuum pump
EP1006281A1 (en) * 1998-12-04 2000-06-07 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Multi-stage roots pump

Also Published As

Publication number Publication date
EP1304484A2 (en) 2003-04-23
US20030072651A1 (en) 2003-04-17
JP2003120543A (en) 2003-04-23
JP3941452B2 (en) 2007-07-04

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Legal Events

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Effective date: 20041005