US20120141314A1 - Vacuum pump - Google Patents

Vacuum pump Download PDF

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Publication number
US20120141314A1
US20120141314A1 US13/389,992 US201013389992A US2012141314A1 US 20120141314 A1 US20120141314 A1 US 20120141314A1 US 201013389992 A US201013389992 A US 201013389992A US 2012141314 A1 US2012141314 A1 US 2012141314A1
Authority
US
United States
Prior art keywords
housing
rotor
vacuum pump
rotor shaft
seal
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.)
Abandoned
Application number
US13/389,992
Inventor
Bernd Hess
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.)
Joma Polytec GmbH
Original Assignee
Joma Polytec GmbH
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 Joma Polytec GmbH filed Critical Joma Polytec GmbH
Assigned to JOMA-POLYTEC GMBH reassignment JOMA-POLYTEC GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HESS, BERND
Publication of US20120141314A1 publication Critical patent/US20120141314A1/en
Abandoned 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C18/3441—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
    • 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

Definitions

  • the invention relates to a vacuum pump having a cup-shaped housing, a rotor eccentrically mounted for rotation in the housing, at least one blade mounted in or on the rotor, and a housing cover closing the housing, wherein the rotor has a rotor shaft, which passes through the cup-shaped housing and by which the rotor is driven.
  • Vacuum pumps having such a configuration typically include a housing made of metal, in which a rotor is rotatably supported via its rotor shaft and in which the work chambers are formed.
  • the pump compartment is sealed to the atmosphere by pressure oil lubrication.
  • the rotor shaft is caused to rotate for example by the engine of a motor vehicle, in particular by the camshaft thereof.
  • the bearing At low rotational speed of the shaft, the bearing is insufficiently supplied with oil by the intermittent lubrication at negative pressure in the pump compartment.
  • oil flows into the pump compartment and the rotation speed of the shaft is too low to establish sufficient lubrication of the bearing.
  • the mixed friction causes an increased torque.
  • the invention is therefore based on the object to provide a vacuum pump in which the torque is decreased in this state, i.e. at low rotation speeds.
  • the bearing gap is sealed to the outside from the atmosphere so that the bearing is sufficiently supplied with oil and in the evacuated state reduces the torque especially in the case of idling rotation speed of the engine.
  • the solution according to the invention can be used in vacuum pumps in particular with an intermittent lubrication.
  • the housing has a housing attachment. for receiving the rotor shaft.
  • the drive opening in the housing attachment to receive the rotor shaft forms the sealing surface for the seal.
  • the seal is seated hereby on the rotor shaft.
  • the rotor shaft has a circumferential groove for receiving the seal.
  • the seal is a radial seal, in particular an O-ring, a radial molded seal ring, a shaft seal ring, or a labyrinth seal.
  • the drive opening is configured in the region of its free end as a stepped bore and is tapered.
  • FIG. 1 a plan view of a vacuum pump with the housing being opened;
  • FIG. 2 a section II-II according to FIG. 1 ;
  • reference sign 10 generally designates a vacuum pump in which the housing 12 is shown without housing cover.
  • the housing 12 has a suction port 14 , which feeds into an interior space 16 .
  • a rotor which is generally designated with 18 and in which at least one blade (not shown) is supported for movement in orthogonal relation to the rotation axis 22 .
  • the rotor 18 has a rotor shaft 22 and a rotor housing 24 , which is only shown as outline and which inter alia is provided to support the at least one blade.
  • the rotor shaft 22 extends through the housing 12 , in particular through a bottom 26 of the interior space 18 via a drive opening 28 and protrudes with a rectangular section 30 on the rear side of the housing 12 out of a housing attachment 32 .
  • the rotor 18 is rotated via the rectangular section 30 , (by means of a not shown drive, e.g. by means of the camshaft of a motor).
  • the rotor shaft 22 is provided with a seal 34 , so that neither lubricant can leak out nor air and/or dirt can enter the interior space 16 .
  • this seal 34 is configured as O-ring 36 and lies in a circumferential groove 38 on the rotor shaft.
  • the inner circumferential surface of the drive opening 28 forms hereby the running and sealing surface for the O-ring.
  • FIGS. 3 and 4 show a second embodiment of the invention in which the seal 34 is configured as labyrinth seal 40 .
  • the latter is formed by a stepped bore section 42 of the drive opening 28 , which stepped bore section 42 is disposed at the free outer end of the drive opening 28 , as shown in FIG. 4 , which shows an enlarged detail IV according to FIG. 3 .
  • the rotor shaft 22 is also stepped at its free end so that it forms a stepped ring gap 44 together with the stepped bore section 42 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

The invention relates to a vacuum pump having a cup-shaped housing, a rotor, eccentrically mounted for rotation in the housing, at least one blade mounted in or on the rotor, and a housing cover closing the cup-shaped housing, wherein the rotor has a rotor shaft that passes through the cup-shaped housing and by which the rotor is driven, wherein the rotor shaft is sealed by means of a seal in the housing.

Description

  • The invention relates to a vacuum pump having a cup-shaped housing, a rotor eccentrically mounted for rotation in the housing, at least one blade mounted in or on the rotor, and a housing cover closing the housing, wherein the rotor has a rotor shaft, which passes through the cup-shaped housing and by which the rotor is driven.
  • Vacuum pumps having such a configuration are known and typically include a housing made of metal, in which a rotor is rotatably supported via its rotor shaft and in which the work chambers are formed. The pump compartment is sealed to the atmosphere by pressure oil lubrication. The rotor shaft is caused to rotate for example by the engine of a motor vehicle, in particular by the camshaft thereof. At low rotational speed of the shaft, the bearing is insufficiently supplied with oil by the intermittent lubrication at negative pressure in the pump compartment. As a result of the pressure difference, oil flows into the pump compartment and the rotation speed of the shaft is too low to establish sufficient lubrication of the bearing. The mixed friction causes an increased torque.
  • The invention is therefore based on the object to provide a vacuum pump in which the torque is decreased in this state, i.e. at low rotation speeds.
  • This object is solved with a vacuum pump of the aforementioned type in that the rotor shaft is sealed by a seal in the housing.
  • In view of the in particular radial seal, the bearing gap is sealed to the outside from the atmosphere so that the bearing is sufficiently supplied with oil and in the evacuated state reduces the torque especially in the case of idling rotation speed of the engine. The solution according to the invention can be used in vacuum pumps in particular with an intermittent lubrication.
  • For optimal arrangement of the seal and for providing a sufficient sealing surface, the housing has a housing attachment. for receiving the rotor shaft.
  • According to an exemplary embodiment, the drive opening in the housing attachment to receive the rotor shaft forms the sealing surface for the seal. The seal is seated hereby on the rotor shaft. In particular, the rotor shaft has a circumferential groove for receiving the seal.
  • According to preferred exemplary embodiments, the seal is a radial seal, in particular an O-ring, a radial molded seal ring, a shaft seal ring, or a labyrinth seal.
  • In the case of a labyrinth seal, the drive opening is configured in the region of its free end as a stepped bore and is tapered.
  • Further advantages, features and details of the invention are set forth from the sub-claims as well as in the following description in which particularly preferred exemplary embodiments are described in detail with reference to the drawing. The features shown in the drawing and mentioned in the description and the claims can be relevant individually or in any combination.
  • In the drawing, it is shown in:
  • FIG. 1 a plan view of a vacuum pump with the housing being opened;
  • FIG. 2 a section II-II according to FIG. 1;
    •
  • In FIG. 1, reference sign 10 generally designates a vacuum pump in which the housing 12 is shown without housing cover. The housing 12 has a suction port 14, which feeds into an interior space 16. Located in this interior space 16 is a rotor which is generally designated with 18 and in which at least one blade (not shown) is supported for movement in orthogonal relation to the rotation axis 22. The rotor 18 has a rotor shaft 22 and a rotor housing 24, which is only shown as outline and which inter alia is provided to support the at least one blade. The rotor shaft 22 extends through the housing 12, in particular through a bottom 26 of the interior space 18 via a drive opening 28 and protrudes with a rectangular section 30 on the rear side of the housing 12 out of a housing attachment 32. The rotor 18 is rotated via the rectangular section 30, (by means of a not shown drive, e.g. by means of the camshaft of a motor).
  • The rotor shaft 22 is provided with a seal 34, so that neither lubricant can leak out nor air and/or dirt can enter the interior space 16. In the exemplary embodiment of FIG. 2, this seal 34 is configured as O-ring 36 and lies in a circumferential groove 38 on the rotor shaft. The inner circumferential surface of the drive opening 28 forms hereby the running and sealing surface for the O-ring.
  • FIGS. 3 and 4 show a second embodiment of the invention in which the seal 34 is configured as labyrinth seal 40. The latter is formed by a stepped bore section 42 of the drive opening 28, which stepped bore section 42 is disposed at the free outer end of the drive opening 28, as shown in FIG. 4, which shows an enlarged detail IV according to FIG. 3. The rotor shaft 22 is also stepped at its free end so that it forms a stepped ring gap 44 together with the stepped bore section 42.

Claims (7)

1-7. (canceled)
8. A vacuum pump, comprising:
a cup-shaped housing;
a rotor eccentrically mounted for rotation in the housing and having a rotor shaft which traverses the cup-shaped housing and drives the rotor;
at least one blade mounted on or in the rotor;
a housing cover to close the cup-shaped housing, and
a labyrinth seal to seal the rotor shaft in the housing.
9. The vacuum pump of claim 8, wherein the housing has a housing attachment for receiving the rotor shaft.
10. The vacuum pump of claim 9, wherein the housing attachment has a drive opening for receiving the rotor shaft, said drive opening forming a sealing surface for the labyrinth seal.
11. The vacuum pump of claim 8, wherein the labyrinth seal is arranged on the rotor shaft.
12. The vacuum pump of claim 8, wherein the rotor shaft is provided with a circumferential groove for receiving the labyrinth seal.
13. The Vacuum pump of claim 10, wherein the drive opening is configured in a region of a free end thereof as a stepped bore and is tapered.
US13/389,992 2009-08-10 2010-07-14 Vacuum pump Abandoned US20120141314A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE202009010890U DE202009010890U1 (en) 2009-08-10 2009-08-10 vacuum pump
DE202009010890.2 2009-08-10
PCT/EP2010/060132 WO2011018293A2 (en) 2009-08-10 2010-07-14 Vacuum pump

Publications (1)

Publication Number Publication Date
US20120141314A1 true US20120141314A1 (en) 2012-06-07

Family

ID=41397128

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/389,992 Abandoned US20120141314A1 (en) 2009-08-10 2010-07-14 Vacuum pump

Country Status (4)

Country Link
US (1) US20120141314A1 (en)
EP (1) EP2464869A2 (en)
DE (1) DE202009010890U1 (en)
WO (1) WO2011018293A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110230596A (en) * 2018-03-06 2019-09-13 施瓦本冶金工程汽车有限公司 Sealing element vacuum pump

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6257387B1 (en) * 1999-04-26 2001-07-10 Fujiunivance Co. Hydraulic power transmission joint
US20070271914A1 (en) * 2006-05-10 2007-11-29 Andreas Bar Transmission having a coaxial lubricant pump

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH379044A (en) * 1960-03-31 1964-06-30 Acc Emanuel Di G E R Emanuel & Rotary compressor with sliding blades
JPH0726624B2 (en) * 1989-08-10 1995-03-29 三菱電機株式会社 Oil rotary vacuum pump shaft seal device
JPH07293467A (en) * 1994-04-28 1995-11-07 Hitachi Ltd Vane-type vacuum pump
US6325602B1 (en) * 1999-09-23 2001-12-04 John J. Rademacher Automotive vacuum pump

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6257387B1 (en) * 1999-04-26 2001-07-10 Fujiunivance Co. Hydraulic power transmission joint
US20070271914A1 (en) * 2006-05-10 2007-11-29 Andreas Bar Transmission having a coaxial lubricant pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110230596A (en) * 2018-03-06 2019-09-13 施瓦本冶金工程汽车有限公司 Sealing element vacuum pump

Also Published As

Publication number Publication date
WO2011018293A2 (en) 2011-02-17
EP2464869A2 (en) 2012-06-20
WO2011018293A3 (en) 2011-12-15
DE202009010890U1 (en) 2009-12-03

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Legal Events

Date Code Title Description
AS Assignment

Owner name: JOMA-POLYTEC GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HESS, BERND;REEL/FRAME:027687/0300

Effective date: 20120123

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION