WO2000077402A1 - Pompe a vide a piston avec soupape de decharge - Google Patents

Pompe a vide a piston avec soupape de decharge Download PDF

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Publication number
WO2000077402A1
WO2000077402A1 PCT/EP2000/003847 EP0003847W WO0077402A1 WO 2000077402 A1 WO2000077402 A1 WO 2000077402A1 EP 0003847 W EP0003847 W EP 0003847W WO 0077402 A1 WO0077402 A1 WO 0077402A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder
vacuum pump
piston
valve
piston vacuum
Prior art date
Application number
PCT/EP2000/003847
Other languages
German (de)
English (en)
Inventor
Thomas Dreifert
Jürgen Meyer
Original Assignee
Leybold Vakuum 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 Leybold Vakuum Gmbh filed Critical Leybold Vakuum Gmbh
Priority to AU42985/00A priority Critical patent/AU4298500A/en
Publication of WO2000077402A1 publication Critical patent/WO2000077402A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/125—Cylinder heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/10—Adaptations or arrangements of distribution members
    • F04B39/1066—Valve plates

Definitions

  • the invention relates to a piston vacuum pump with the features of the preamble of claim 1.
  • a disadvantage of the known valve concept is the complex sealing of the exhaust valve with respect to the cylinder block, for example in the form of an O-ring in a self-retaining groove surrounding the cylinder bore.
  • the production of the groove and the assembly of this seal are complex.
  • valve plate which is generally made of sheet metal
  • elastomer in order to achieve a seal on the valve block.
  • This solution is also relatively complex. It requires a valve sheet with a relatively large thickness so that it cannot be warped by the elastomer. This makes the mass of the valve plate relatively large, with the result that the pump becomes noisy because the valve has to be pushed open by the piston.
  • the present invention has for its object to simplify the seal of the exhaust valve of the cylinder-piston system of a piston vacuum pump with the features of the preamble of claim 1 and. to improve.
  • this object is achieved in that a cylinder head gasket is provided which has a circular section in the region of the cylinder end face, the edge of which extends into the region of the inner edge of the cylinder bore and at the same time forms the valve gasket.
  • Valve preload and valve seat geometry are variable
  • valve plate can be made thin and is therefore light; the thin sheet bends slightly, so that the valve is pressure-controlled even at relatively small pressure differences; with the displacement control taking place at lower pressure differences, the piston-valve contact is relatively gentle;
  • FIGS. 1 to 6 Show it
  • FIGS. 1 and 2 show a piston vacuum pump in a row design
  • FIGS. 3 to 5 partial sections through the cylinder block and cylinder head in the area of the exhaust valve, which show exemplary embodiments designed according to the invention.
  • Figure 6 shows a further partial section for an embodiment according to the invention with an intermediate plate and a second flat gasket.
  • Figures 1 and 2 show a piston vacuum pump 1 with three cylinders 2, 3, 4, which are arranged in series.
  • the associated pistons are designated 5, 6, 7.
  • the pistons are connected to the crankshaft 11 by means of piston bearings, connecting rods and crank bearings, which are not indicated individually by reference numerals but are indicated only schematically.
  • the bearing supports 12 Crankshaft 11 in the housing 13.
  • the crankshaft drive is denoted by 14, the axis of rotation of the crankshaft 11 by 15.
  • the inlet and outlet of the pump 1 have the reference symbols 16 and 17.
  • the housing 13 is in two parts. It includes the cylinder block 18 and the cylinder head 19.
  • the parting plane 20 lies at the level of the end faces of the cylinders 2, 3, 4 facing away from the crankshaft.
  • the respective exhaust valves not shown in FIGS. 1 and 2, as shown in FIG WO 98/09080 are known, they comprise a valve disk whose diameter is larger than the diameter of the cylinder bore.
  • the front edge of the cylinder forms the valve seat.
  • piston 7 with a larger diameter than the diameters of the other pistons 5, 6.
  • the larger piston 7 is arranged on the inlet side, i.e. the lateral inlet of the associated scooping chamber 22, the volume of which determines the pumping speed of the pump, is directly connected to the inlet 16.
  • the gas flow is indicated by dashed lines. Pistons with smaller diameters can be used on the outlet side, since these no longer require the suction capacity on the inlet side due to the progressive compression in the pump stages.
  • the piston vacuum pump shown in Figure 1 is designed in three stages.
  • the three cylinders are arranged one behind the other.
  • the inlet 16 is connected to the inlet of the pump chamber 22 of the cylinder-piston system 4, 7.
  • the inlet of the scooping chamber 23 of the cylinder-piston system 2, 5 connects to the outlet of the scooping chamber 22 in the cylinder 7 located at the end. Downstream of this is the cylinder-piston system 4, 6 with the scoop space 24.
  • the pumping speed can be increased if - as shown in FIG. 2 - the two cylinder-piston systems 4, 7 and 2, 5 on the inlet side are combined to form a stage and are operated in parallel.
  • the cylinder-piston system 4, 6 forms the second outlet stage.
  • FIGS. 3 to 6 only one cylinder-piston system is partially shown as an example of the solution according to the invention.
  • the system 3, 6 was selected. They each show the exhaust valve 26, the valve plate 27 of which, in the closed state, separates the compression chamber 24 from a chamber 28 provided in the cylinder head 19.
  • the outlet channel 29 is connected to the chamber 28.
  • the valve plate 27 has a larger diameter than the associated bore of the cylinder. Lindner 3. The edge surrounding the cylinder bore forms the valve seat 31.
  • Figure 3 shows an embodiment for holding the valve plate 27 on the cylinder head 19. This is done by means of a compression spring 33, which also serves to generate the desired closing force.
  • the seal between the cylinder block 18 and the cylinder head 19 is a flat gasket 35, e.g. made of an elastomer. This extends so far into the area of the edge 36 of the bore of the cylinder 3 that the valve plate 27 rests on the flat seal 35 in the closed state.
  • the cylinder head gasket 35 which has circular cutouts in the area of the cylinders, thus simultaneously forms the valve gasket.
  • the exemplary embodiment according to FIG. 4 differs from the exemplary embodiment according to FIG. 3 in that the edge 36 of the cylinder bore is chamfered. This reduces the contact area of the valve plate on its valve seal.
  • This aim also has the solution according to FIG. 5, in which a bead 37 surrounding the bore of the cylinder 3 is provided. An almost linear contact between the valve disc and valve seal is achieved.
  • FIG. 5 also shows one of the bolts 41 with which the cylinder head 19 is fastened on the cylinder head 18.
  • At the level of the flat seal 35 is one Spacer 42 inserted, with the aid of which a defined compression of the flat seal 35 can be achieved.
  • an intermediate plate 44 lies on the flat gasket 35, which in turn is sealed against the cylinder head 19 by means of a second flat gasket 45.
  • the pumping speed of the piston vacuum pump can be changed with the aid of various intermediate plates 44. They are used to release and close channels that e.g. the operating modes described for Figures 1 and 2 (series connection, parallel connection of cylinder-piston systems) enable.
  • corresponding spacer rings 42, 46 can be provided. It is particularly expedient to use a sleeve 47 (shown in broken lines) instead of the two spacer rings 42, 46.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Compressor (AREA)

Abstract

L'invention concerne une pompe à vide à piston (1) comprenant un bâti (13) comportant une partie (bloc-cylindre 18) logeant au moins un cylindre (2, 3, 4) et une tête de cylindre (19), ainsi qu'un piston (5, 6, 7) oscillant dans un cylindre et une soupape de décharge (26) présentant une pièce de fermeture (27), un siège de soupape (31) et un joint de soupape (35), la partie du cylindre tournée vers la tête de cylindre (19) étant utilisée comme siège de soupape (31), et un disque de soupape (27) adapté au diamètre du siège de soupape (31) étant utilisé comme pièce de fermeture. En vue de simplifier la construction, l'invention est caractérisée en ce qu'il est prévu un joint (35) de tête de cylindre présentant, dans la zone de la partie frontale du cylindre, une section circulaire dont le bord s'étend jusque dans la zone du bord intérieur (36) du cylindre (2, 3, 4) et forme en même temps le joint de soupape.
PCT/EP2000/003847 1999-06-09 2000-04-28 Pompe a vide a piston avec soupape de decharge WO2000077402A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU42985/00A AU4298500A (en) 1999-06-09 2000-04-28 Piston vacuum pump with a discharge valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999126186 DE19926186A1 (de) 1999-06-09 1999-06-09 Kolbenvakuumpumpe mit Auslassventil
DE19926186.5 1999-06-09

Publications (1)

Publication Number Publication Date
WO2000077402A1 true WO2000077402A1 (fr) 2000-12-21

Family

ID=7910611

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/003847 WO2000077402A1 (fr) 1999-06-09 2000-04-28 Pompe a vide a piston avec soupape de decharge

Country Status (3)

Country Link
AU (1) AU4298500A (fr)
DE (1) DE19926186A1 (fr)
WO (1) WO2000077402A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108506188A (zh) * 2018-03-22 2018-09-07 李志慧 一种医疗用大型负压发生装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1247022A1 (fr) * 2000-01-10 2002-10-09 Thomas Industries, Inc. Construction d'un corps de pompe
US6527524B2 (en) * 2001-06-19 2003-03-04 Pumptec, Inc. Double acting simplex plunger pump with bi-directional valves
JP2004108271A (ja) * 2002-09-19 2004-04-08 Honda Motor Co Ltd 圧縮機
US6779991B2 (en) 2002-10-29 2004-08-24 Thomas Industries Inc. Axial piston pump
DE10308421A1 (de) * 2003-02-27 2004-09-09 Leybold Vakuum Gmbh Kolbenpumpe, vorzugsweise Kolbenvakuumpumpe, mit Auslassventil

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2751146A (en) * 1951-10-29 1956-06-19 Dalmo Victor Company Air compressor
US4408967A (en) * 1981-02-25 1983-10-11 Wabco Fahrzeugbremsen Gmbh Piston cylinder and head for compressors
US5203857A (en) * 1990-06-01 1993-04-20 Bristol Compressors, Inc. Gas compressor head and discharge valve construction
EP0731274A2 (fr) * 1992-12-21 1996-09-11 Commonwealth Scientific And Industrial Research Organisation Pompe à vide multi-étagée
WO1998009080A1 (fr) * 1996-08-27 1998-03-05 Leybold Vakuum Gmbh Pompe a vide a piston dotee d'une soupape de sortie

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH130514A (de) * 1927-10-08 1928-12-15 Otto Philipp Ein- und Auslassventil für Höchstdruck-Kolbenkompressoren.
AT170744B (de) * 1949-05-25 1952-03-25 Hoerbiger & Co Selbsttätiges Ventil mit Mehrfachabdichtung für Kompressoren
DE2855541C2 (de) * 1978-12-22 1982-05-19 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Druckventil für eine Kolbenpumpe
US4701114A (en) * 1986-07-25 1987-10-20 American Standard Inc. Compressor suction gas heat shield
BR9001860A (pt) * 1990-04-17 1991-11-12 Brasil Compressores Sa Junta de cabecote do cilindro de um compressor alternativo
DE4429097A1 (de) * 1994-08-17 1996-02-22 Thurner Bayer Druckguss Kolbenverdichter für gasförmige Medien
DE19634519A1 (de) * 1996-08-27 1998-03-05 Leybold Vakuum Gmbh Kolbenvakuumpumpe mit Eintritt und Austritt

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2751146A (en) * 1951-10-29 1956-06-19 Dalmo Victor Company Air compressor
US4408967A (en) * 1981-02-25 1983-10-11 Wabco Fahrzeugbremsen Gmbh Piston cylinder and head for compressors
US5203857A (en) * 1990-06-01 1993-04-20 Bristol Compressors, Inc. Gas compressor head and discharge valve construction
EP0731274A2 (fr) * 1992-12-21 1996-09-11 Commonwealth Scientific And Industrial Research Organisation Pompe à vide multi-étagée
WO1998009080A1 (fr) * 1996-08-27 1998-03-05 Leybold Vakuum Gmbh Pompe a vide a piston dotee d'une soupape de sortie

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108506188A (zh) * 2018-03-22 2018-09-07 李志慧 一种医疗用大型负压发生装置

Also Published As

Publication number Publication date
DE19926186A1 (de) 2000-12-14
AU4298500A (en) 2001-01-02

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