WO2005008074A1 - Pompe à vide - Google Patents

Pompe à vide Download PDF

Info

Publication number
WO2005008074A1
WO2005008074A1 PCT/IT2003/000447 IT0300447W WO2005008074A1 WO 2005008074 A1 WO2005008074 A1 WO 2005008074A1 IT 0300447 W IT0300447 W IT 0300447W WO 2005008074 A1 WO2005008074 A1 WO 2005008074A1
Authority
WO
WIPO (PCT)
Prior art keywords
opening
pump
distribution conduit
operating liquid
rotor
Prior art date
Application number
PCT/IT2003/000447
Other languages
English (en)
Inventor
Sergio Bisetti
Original Assignee
Ab Progetti S.R.L.
BISETTI, Enrico
BISETTI, Edoardo
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 Ab Progetti S.R.L., BISETTI, Enrico, BISETTI, Edoardo filed Critical Ab Progetti S.R.L.
Priority to AT03817522T priority Critical patent/ATE372465T1/de
Priority to AU2003253259A priority patent/AU2003253259A1/en
Priority to EP03817522A priority patent/EP1654463B1/fr
Priority to PCT/IT2003/000447 priority patent/WO2005008074A1/fr
Priority to DE60316199T priority patent/DE60316199T2/de
Publication of WO2005008074A1 publication Critical patent/WO2005008074A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/02—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid
    • F04F5/04—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid displacing elastic fluids
    • F04F5/06—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid displacing elastic fluids of rotary type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/02—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid
    • F04F5/04—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid displacing elastic fluids
    • F04F5/08—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid displacing elastic fluids the elastic fluid being entrained in a free falling column of liquid

Definitions

  • the present invention relates to a vacuum pump, i.e. a pump for producing a vacuum or predetermined low pressure in an environment connected to it.
  • a vacuum pump i.e. a pump for producing a vacuum or predetermined low pressure in an environment connected to it.
  • Vacuum pumps are known which operate on the principle of moving an operating liquid, normally water, along a curved path to draw a gaseous fluid, air or gas, by suction and centrifugal force from an environment communicating with the liquid-moving chamber.
  • liquid-ring vacuum pumps which substantially comprise a cylindrical casing or outer body having one or more inlet openings connected to a first environment, and one or more outlet openings connected to a second environment; and a rotor mounted to rotate inside the casing about an axis eccentric with respect to the casing axis, and having a number of contoured, substantially radial blades.
  • the casing is filled partly with operating liquid, and rotation of the rotor produces a ring of moving liquid.
  • the operating liquid is spun on to the casing wall, thus drawing up the gaseous fluid from the first environment, and, along another angular section of the rotor's travel, the operating liquid is moved towards the centre of the casing to expel the aspirated gaseous fluid through the outlet openings into the second environment .
  • the liquid ring acts as a compressing agent, and performs the same function as a reciprocating piston in a hydraulic cylinder.
  • a vacuum pump comprising an outer casing having at least a first opening connected to an environment in which a vacuum is to be formed; and a rotor supplied with an operating liquid, and mounted to rotate about an axis inside said casing to produce, by movement of said operating liquid, a vacuum in the environment connected to said first opening; characterized in that said rotor comprises generating means for generating a screw-shaped stream of operating liquid to draw gaseous fluid by suction through said first opening.
  • Figure 1 shows a side view of a vacuum pump in accordance with the present invention
  • Figures 2 and 3 show, with parts removed for clarity, respective larger-scale axial sections, in perpendicular planes, of the Figure 1 pump
  • Figure 4 shows a section along line IV-IV in Figure 3
  • Figure 5 shows a larger-scale view of a detail of the Figure 3 pump.
  • BEST MODE FOR CARRYING OUT THE INVENTION Number 1 in Figures 1 to 3 indicates as a whole a vacuum pump in accordance with the present invention.
  • Pump 1 substantially comprises a supporting structure 2 indicated schematically by a dash line in Figure 1; a tubular casing 3, of axis A, fitted vertically to supporting structure 2, and having an opening 4 connected to a feed conduit 6 (shown only partly in Figure 1) supplying operating liquid, in this case water, and an opening 5 connected to an environment in which a vacuum is to be produced; and a rotor 7, of axis A, mounted inside casing 3 to rotate about axis A and generate, by movement of the operating liquid, a vacuum in the environment connected to opening 5.
  • Casing 3 substantially comprises a cylindrical main portion 8; and a truncated-cone-shaped bottom end portion
  • main portion 8 of casing 3 is defined by four cylindrical tubular bodies 12, 13, 14, 15, which have respective top and bottom flanges 16, 17 projecting radially outwards, and are fixed coaxially and in fluidtight manner to one another by bolts along respective flanges 16, 17. More specifically, tubular body 12 is fixed in fluidtight manner to bottom end portion 9 of casing 3, and tubular bodies 13, 14, 15 are arranged successively along axis A as of tubular body 12.
  • tubular bodies 13, 14 have respective openings 5, 4, from which project, respectively, a fitting 19 for attaching a conduit 21 connected to the environment in which to produce a vacuum, and a fitting 20 for attaching feed conduit 6.
  • Tubular bodies 13, 14, 15 are substantially the same length and shorter than tubular body 12 ; and the top flange 16 of tubular body 15 defines a supporting and fastening surface for a known electric motor 22 powering rotor 7.
  • rotor 7 is angularly integral with an output shaft 23 of electric motor 22, having axis A and projecting inside tubular bodies 14, 15 of casing 3.
  • shaft 23 extends through and is fitted to a cylindrical bushing 24 extending inside tubular body 15 and fixed to and projecting from a plate 25 gripped between bottom flange 17 of tubular body 15 and top flange 16 of tubular body 14. More specifically, shaft 23 is fitted in axially fixed, rotary manner to bushing 24 by means of two bearings, and engages a central through opening in plate 25.
  • a first sealing ring 30 is provided between plate 25 and top flange 16 of tubular body 14, and a second sealing ring 31 is provided between shaft 23 and plate 25.
  • Shaft 23 has a threaded end portion 32 projecting inside tubular body 14 and screwed and tightened by a bolt 33 to a supporting member 34, of axis A, from which rotor 7 projects integrally.
  • supporting member 34 is housed inside tubular body 14, is substantially cup-shaped, and comprises a disk-shaped top end wall 35 having a through hole 36, of axis A, for insertion of end portion 32 of shaft 23; and a substantially cylindrical lateral wall 37, which has a number of windows 38, through which the operating liquid entering casing 3 from opening 4 flows, and which defines, at the opposite end to end wall 35, an opening 39 by which operating liquid is fed to rotor 7.
  • lateral wall 37 defines an end flange 40 projecting radially outwards and fixed by screws to an annular plate 42 fitted for rotation, with the interposition of a bushing, inside bottom flange 17 of tubular body 14.
  • Plate 42 defines a central opening 44 communicating with opening 39 to permit operating liquid flow to rotor 7, and has a peripheral edge 45 projecting parallel to axis A and fixed by screws to rotor 7.
  • An important aspect of the present invention lies in rotor 7 having a distribution conduit 50 for distributing the operating liquid fed by conduit 6 through openings 39, 44 in supporting member 34 and plate 42, and producing, as rotor 7 rotates about axis A, a screw- shaped stream of operating liquid to draw gaseous fluid, e.g.
  • rotor 7 extends inside tubular body 13, faces opening 5, and comprises a disk-shaped plate 51 fixed to the projecting peripheral edge 45 of plate 42, engaging top flange 16 of tubular body 13 in rotary and axially fixed manner, and from which distribution conduit 50 projects.
  • distribution conduit 50 projects from plate 51 along axis A, has an elongated rectangular section extending along a diameter of plate 51, and is fixed, e.g. welded, to a lateral edge of a diametrical through opening 52 in plate 51.
  • Opening 52 is also rectangular, decreases slightly in section from the side facing plate 42, and assumes the same shape as the section of distribution conduit 50 on the side from which this originates.
  • Distribution conduit 50 has an outlet 55 located close to and downstream from opening 5 in the operating liquid flow direction.
  • Rotor 7 also comprises two blades 53, which project from plate 51 along axis A and the whole length of distribution conduit 50, are oriented along the same diameter of plate 51, perpendicular to the diameter from which distribution conduit 50 originates, and are fixed to opposite sides of distribution conduit 50 to define, with it, a cross-shaped impeller. Blades 53 substantially provide for balancing rotor 7 as it rotates .
  • the operating liquid fed into tubular body 14 of casing 3 along conduit 6 and through opening 4 flows through supporting member 34 and openings 44, 52 in plates 42, 51 into distribution conduit 50.
  • pump 1 By force of gravity and the rotation of rotor 7, the operating liquid flows from the bottom end of distribution conduit 50 to form, in the part of casing 3 beneath opening 5 and rotor 7, a screw-shaped stream of operating liquid, which draws gaseous fluid through opening 5 by suction to produce a vacuum in the environment connected to opening 5.
  • pump 1 is straightforward and cheap to produce, by not requiring, for example, a rotor with contoured blades .
  • rotor 7 substantially comprises a distribution conduit 50 rotating about axis A, pump 1 can handle relatively high operating liquid flow rates of about 200 m 3 /h, i.e.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Electrophonic Musical Instruments (AREA)

Abstract

L'invention porte sur une pompe à vide (1) possédant un revêtement extérieur (3) pourvu d'au moins une ouverture (5) raccordée à un environnement dans lequel doit se former un vide; et un rotor (7) alimenté par un liquide de fonctionnement et monté de façon à tourner autour d'un axe (A) à l'intérieur du revêtement (3) afin de produire, par le déplacement du liquide de fonctionnement, un vide dans l'environnement relié à l'ouverture (5); le rotor (7) possède un générateur (50) pour générer un courant de forme hélicoïdale du liquide de fonctionnement afin d'aspirer le fluide gazeux par l'ouverture (5).
PCT/IT2003/000447 2003-07-18 2003-07-18 Pompe à vide WO2005008074A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT03817522T ATE372465T1 (de) 2003-07-18 2003-07-18 Vakuumpumpe
AU2003253259A AU2003253259A1 (en) 2003-07-18 2003-07-18 Vacuum pump
EP03817522A EP1654463B1 (fr) 2003-07-18 2003-07-18 Pompe vide
PCT/IT2003/000447 WO2005008074A1 (fr) 2003-07-18 2003-07-18 Pompe à vide
DE60316199T DE60316199T2 (de) 2003-07-18 2003-07-18 Vakuumpumpe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2003/000447 WO2005008074A1 (fr) 2003-07-18 2003-07-18 Pompe à vide

Publications (1)

Publication Number Publication Date
WO2005008074A1 true WO2005008074A1 (fr) 2005-01-27

Family

ID=34074062

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2003/000447 WO2005008074A1 (fr) 2003-07-18 2003-07-18 Pompe à vide

Country Status (5)

Country Link
EP (1) EP1654463B1 (fr)
AT (1) ATE372465T1 (fr)
AU (1) AU2003253259A1 (fr)
DE (1) DE60316199T2 (fr)
WO (1) WO2005008074A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE592772C (de) * 1930-07-22 1934-02-14 Franjo Bratina Strahlapparat
FR893350A (fr) * 1942-06-11 1944-06-06 Aschaffenburger Zellstoffwerke Procédé et appareil pour l'écoulement simultané de liquide et d'air par des tuyaux de descente
DE7009100U (de) * 1970-03-12 1970-06-18 Thaller Josef Vakuumpumpe.
DE19737186A1 (de) * 1997-08-26 1999-03-04 Alexander Scharf Gasabsaugpumpe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE592772C (de) * 1930-07-22 1934-02-14 Franjo Bratina Strahlapparat
FR893350A (fr) * 1942-06-11 1944-06-06 Aschaffenburger Zellstoffwerke Procédé et appareil pour l'écoulement simultané de liquide et d'air par des tuyaux de descente
DE7009100U (de) * 1970-03-12 1970-06-18 Thaller Josef Vakuumpumpe.
DE19737186A1 (de) * 1997-08-26 1999-03-04 Alexander Scharf Gasabsaugpumpe

Also Published As

Publication number Publication date
EP1654463B1 (fr) 2007-09-05
ATE372465T1 (de) 2007-09-15
DE60316199D1 (de) 2007-10-18
AU2003253259A1 (en) 2005-02-04
EP1654463A1 (fr) 2006-05-10
DE60316199T2 (de) 2008-05-21

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