EP0391182A2 - Pompe à vide - Google Patents

Pompe à vide Download PDF

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Publication number
EP0391182A2
EP0391182A2 EP90105628A EP90105628A EP0391182A2 EP 0391182 A2 EP0391182 A2 EP 0391182A2 EP 90105628 A EP90105628 A EP 90105628A EP 90105628 A EP90105628 A EP 90105628A EP 0391182 A2 EP0391182 A2 EP 0391182A2
Authority
EP
European Patent Office
Prior art keywords
piston
plastic
housing
vacuum pump
shaft
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Withdrawn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
EP90105628A
Other languages
German (de)
English (en)
Other versions
EP0391182A3 (fr
Inventor
Heiko Borhau
Heinz Frings
Helmut Gormanns
Karl-Heinz Ronthaler
Ralf Stefens
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.)
Balzers und Leybold Deutschland Holding AG
Original Assignee
Leybold AG
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 Leybold AG filed Critical Leybold AG
Publication of EP0391182A2 publication Critical patent/EP0391182A2/fr
Publication of EP0391182A3 publication Critical patent/EP0391182A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F01C21/104—Stators; Members defining the outer boundaries of the working chamber
    • F01C21/106—Stators; Members defining the outer boundaries of the working chamber with a radial surface, e.g. cam rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons
    • 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
    • F04C18/082—Details specially related to intermeshing engagement type pumps
    • F04C18/084—Toothed wheels

Definitions

  • the invention relates to a vacuum pump with a housing, with a pump chamber formed in the housing, with at least one piston rotating in the pump chamber and with a shaft passing through the piston, the housing and / or piston being produced using plastic in such a way that the housing consist of plastic at least in the area of its peripheral inner chamber space and / or the pistons at least in the area of its peripheral surface.
  • the housing Due to the external atmosphere and the vacuum in the pumping chamber, the housing is subject to a pressure difference which generates a force directed from the outside in. If the housing wall is not rigid, then a deformation of the housing wall generated due to this force also has an effect such that the gaps between the housing wall and the Roots are smaller, so that there is also the risk of contact between the housing wall and the pistons.
  • the present invention has for its object to provide a vacuum pump of the type mentioned, which is easy to manufacture and in which despite the use of plastic and exploitation of the associated advantages, the disadvantages described do not occur.
  • a metallic reinforcement is provided in the plastic.
  • the metal reinforcement which is expediently adapted to the outer shape of the piston and / or the shape of the inner wall of the scooping chamber can be a cast blank which is coated with plastic to form the surface of the piston or the scoop chamber inner wall.
  • Another alternative is to use a metal mesh as the metal reinforcement.
  • the plastic is equipped with a reinforcement consisting of a plastic grid or - preferably - a grid-shaped glass fiber mat.
  • the vacuum pump shown in Figure 1 comprises the housing 1, in which the scoop 3 is located.
  • the piston 4 is arranged eccentrically in such a way that it abuts the inner wall 5 of the scoop chamber 3 at 6.
  • To the side of this system 6 are the inlet 7 and the outlet 8 of the pump.
  • the piston 4 has two radial slots in which the slides 13 and 14 are located.
  • the shaft passing through the piston is designated by 15. Further details, such as intake or exhaust valves or the like, which are not relevant to the invention, are not shown.
  • the piston 4 is - except for the shaft 15, which usually consists of steel - made of plastic.
  • Bands 16 and 17 are provided as reinforcements. These can consist of metal, stable plastic or glass fiber. They include the shaft 15 and are welded or glued to it. Otherwise, the bands extend outwards in such a way that they are approximately matched to the cylindrical shape of the piston 4.
  • the mesh width of the bands 16, 17 should be at least two millimeters, so that the plastic that is produced when the piston 4 is produced by casting or injection molding flows inside out, the strip material can pass essentially unhindered.
  • the housing 1 consists of the cast blank 2 made of gray cast iron or aluminum.
  • a plastic layer 18 is provided in the area of the inner wall 5 of the scooping chamber 3 and is reinforced by the cast blank 2.
  • the plastic layer should be at least five millimeters thick so that trouble-free production - by casting or spraying with the help of a negative mold - is possible.
  • FIG. 2 shows a vacuum pump 1 designed as a Roots pump, the Roots 21, 22 of which are designed to be coiled by approximately 90 °.
  • Housing 10 and pistons 21, 22 are designed according to the invention.
  • the shafts of the pistons 21, 22 are designated 23 and 24.
  • the pistons have two wings. The invention is also applicable to three-bladed pistons.
  • the piston 21 has a cast blank 25 which is connected to the shaft 23 in a rotationally fixed manner and which is provided with the plastic layer 26.
  • the structure of the piston 22 has been selected as described for the piston 4 according to FIG. 1.
  • the piston 22 is made of plastic with a reinforcement formed by the bands 16, 17.
  • the metal strips 16, 17 are firmly connected to the shaft 24 and have a shape which - somewhat reduced - corresponds to the outer shape of the piston 22.
  • the shaft 24 has an elongated narrow shape in cross section, the longitudinal axis of which coincides with the longitudinal axis of the piston 22. This enables a secure connection between the shaft 24 and the plastic while maintaining a narrow waist.
  • a polygonal, preferably elongated hexagonal design is particularly useful. This creates flat surfaces to which the tapes 16, 17 can be attached in a simple manner.
  • the shaft 24 is also expediently coiled in the same sense.
  • the housing 1 consists of plastic walls 10.
  • the insert 20 is located in the plastic, which is also formed by a metal or glass fiber fabric.
  • a plurality of belts 20, which are guided approximately in parallel, can also be provided.
  • the piston 27 shown in FIG. 3 for a Roots pump has a metal reinforcement which consists of two steel profile bodies 28, 29.
  • the steel profile bodies 28, 29 have an essentially round cross section and are each provided with a sector-shaped longitudinal recess 31, 32.
  • the shaft 33 abuts the profile bodies 28, 29 in the region of these recesses and is welded to it.
  • the steel profile body 28, 29 form an effective wing reinforcement of the piston 27, which is otherwise surrounded by the plastic jacket 34. A coiled version of this piston 27 is also possible.
  • FIG. 4 shows a vacuum pump designed as a claw pump.
  • the claw rotors rotating in the suction chamber are designated 35 and 36 and have the shafts 37, 38.
  • the rotor or piston 35 is again - except for the shaft 37 - made of plastic, which is reinforced with a band-shaped insert 39.
  • the rotor 36 has the cast blank 41, which is connected in a rotationally fixed manner to the shaft 38 and carries the plastic casing 42.
  • the reinforcements (band 39, cast blank 41) extend into the claws 43, 44, which have the task of separating the suction spaces that are formed from the discharge spaces, in a contactless manner. The radial accuracy required in the area of the claws is therefore not affected by the centrifugal forces that occur.
  • the housing 1 comprises a cast frame 2 and a plastic layer 18.
  • the plastic layer 18 forms the inner shape of the scooping space 3.
  • the piston and housing are each made of plastic produced.
  • the piston and housing are each made of plastic produced.
  • All plastics that can be cast or sprayed and that are suitable for use in vacuum pumps for.
  • the fabric used to form the reinforcement can be, for example, an expanded metal according to DIN 2.1. It is essential that it has a relatively large mesh size, so that it does not interfere with the casting or injection of the plastic and nevertheless holds and supports the plastic in a form-fitting manner. The reinforcement thus takes over the stress caused by centrifugal force and / or pressure differences.
  • the illustrated embodiments show the design of the pistons and scoops in their peripheral areas.
  • the pistons and scoops can also be formed laterally in the manner according to the invention.
  • the side surfaces are made of plastic anyway.
  • plastic layers 26, 34, and 42 must also be present on the side.
  • the side shields, not shown, which delimit the scoop space can also be produced according to the invention in such a way that their inner walls consist of plastic. Both the training as an all-plastic part with reinforcement (FIG. 2) or as a plastic layer with a cast blank reinforcement is possible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Compressor (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
EP19900105628 1989-04-07 1990-03-24 Pompe à vide Withdrawn EP0391182A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3911314 1989-04-07
DE19893911314 DE3911314A1 (de) 1989-04-07 1989-04-07 Vakuumpumpe

Publications (2)

Publication Number Publication Date
EP0391182A2 true EP0391182A2 (fr) 1990-10-10
EP0391182A3 EP0391182A3 (fr) 1991-01-16

Family

ID=6378097

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900105628 Withdrawn EP0391182A3 (fr) 1989-04-07 1990-03-24 Pompe à vide

Country Status (3)

Country Link
EP (1) EP0391182A3 (fr)
JP (1) JPH02286895A (fr)
DE (1) DE3911314A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4439724A1 (de) * 1994-11-09 1996-05-15 Leybold Ag Trockenverdichtende Zweiwellen-Verdrängermaschine
DE102005057618A1 (de) * 2005-12-02 2007-06-06 Pfeiffer Vacuum Gmbh Verfahren zum Betrieb einer Vakuumpumpe
GB2440944A (en) * 2006-08-11 2008-02-20 Itt Mfg Enterprises Inc Cassette for rotary lobe pump

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8192184B2 (en) * 2005-11-09 2012-06-05 Ixetic Hueckeswagen Gmbh Pump with a cylindrical cooling bush
KR101016085B1 (ko) * 2009-01-12 2011-02-17 유종욱 고압 펌프
KR20140031326A (ko) * 2011-06-02 2014-03-12 이턴 코포레이션 단순화된 루트 타입 블로워
WO2016038746A1 (fr) * 2014-09-12 2016-03-17 三桜工業株式会社 Pompe à pression négative et couvercle de culasse

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2002518A1 (de) * 1970-01-21 1971-07-29 Vogelsang Hugo Fa Dickstoff- bzw. Guellepumpe
JPS58192991A (ja) * 1982-05-06 1983-11-10 Nippon Denso Co Ltd 回転形圧縮機
FR2527702A1 (fr) * 1982-05-28 1983-12-02 Danger Roger Compresseur de fluide a palettes rotatives
DE3321718A1 (de) * 1983-06-16 1984-12-20 Arthur Pfeiffer Vakuumtechnik Wetzlar Gmbh, 6334 Asslar Waelzkolbenpumpe
JPS63177188A (ja) * 1987-01-19 1988-07-21 Canon Inc 板書複写装置
EP0303553A2 (fr) * 1987-08-12 1989-02-15 United Technologies Corporation Compresseur de composite hybride

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2519588A (en) * 1943-12-24 1950-08-22 Borg Warner Pump housing
FR1285311A (fr) * 1961-01-09 1962-02-23 Compteurs Comp D Perfectionnements aux pistons rotatifs de pompes, compresseurs ou compteurs volumétriques
US3514238A (en) * 1968-09-16 1970-05-26 Black & Decker Mfg Co Cylinder for fluid pump motor and the like and method of making
JPS5720852Y2 (fr) * 1978-05-22 1982-05-06
IT1179910B (it) * 1984-04-16 1987-09-16 Gilardini Spa Compressore volumetrico per l alimentazione a motori endotermici di veicoli
DE3712354A1 (de) * 1986-11-08 1988-05-11 Wankel Gmbh Rotationskolbengeblaese

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2002518A1 (de) * 1970-01-21 1971-07-29 Vogelsang Hugo Fa Dickstoff- bzw. Guellepumpe
JPS58192991A (ja) * 1982-05-06 1983-11-10 Nippon Denso Co Ltd 回転形圧縮機
FR2527702A1 (fr) * 1982-05-28 1983-12-02 Danger Roger Compresseur de fluide a palettes rotatives
DE3321718A1 (de) * 1983-06-16 1984-12-20 Arthur Pfeiffer Vakuumtechnik Wetzlar Gmbh, 6334 Asslar Waelzkolbenpumpe
JPS63177188A (ja) * 1987-01-19 1988-07-21 Canon Inc 板書複写装置
EP0303553A2 (fr) * 1987-08-12 1989-02-15 United Technologies Corporation Compresseur de composite hybride

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, unexamined applications, M sektion, Band 12, Nr. 364, September 29, 1988, THE PATENT OFFICE JAPANESE GOVERNMENT, Seite 13 (M-747); & JP-A-63 177 188 (AISIN) *
PATENT ABSTRACTS OF JAPAN, unexamined applications, M Sektion, Band 8, Nr. 37, Februar 17, 1984, THE PATENT OFFICE JAPANESE GOVERNMENT, Seite 28 (M-277); & JP-A-58 192 991 (NIPPON DENSO) *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4439724A1 (de) * 1994-11-09 1996-05-15 Leybold Ag Trockenverdichtende Zweiwellen-Verdrängermaschine
DE102005057618A1 (de) * 2005-12-02 2007-06-06 Pfeiffer Vacuum Gmbh Verfahren zum Betrieb einer Vakuumpumpe
GB2440944A (en) * 2006-08-11 2008-02-20 Itt Mfg Enterprises Inc Cassette for rotary lobe pump
EP1892417A2 (fr) * 2006-08-11 2008-02-27 ITT Manufacturing Enterprises, Inc. Pompe à lobes rotative
EP1892417A3 (fr) * 2006-08-11 2009-06-03 ITT Manufacturing Enterprises, Inc. Pompe à lobes rotative
US7857607B2 (en) 2006-08-11 2010-12-28 Itt Manufacturing Enterprises, Inc. Rotary lobe pump
GB2440944B (en) * 2006-08-11 2011-10-12 Itt Mfg Enterprises Inc Rotary lobe pump
CN101122288B (zh) * 2006-08-11 2012-01-11 Itt制造企业公司 旋转凸轮泵

Also Published As

Publication number Publication date
EP0391182A3 (fr) 1991-01-16
JPH02286895A (ja) 1990-11-27
DE3911314A1 (de) 1990-10-11

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