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EP3240958A1 - Pompe à fluide rotative - Google Patents

Pompe à fluide rotative

Info

Publication number
EP3240958A1
EP3240958A1 EP15841050.6A EP15841050A EP3240958A1 EP 3240958 A1 EP3240958 A1 EP 3240958A1 EP 15841050 A EP15841050 A EP 15841050A EP 3240958 A1 EP3240958 A1 EP 3240958A1
Authority
EP
European Patent Office
Prior art keywords
pump
lubrication
duct
cavity
valve
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Withdrawn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
EP15841050.6A
Other languages
German (de)
English (en)
Inventor
Leonardo Cadeddu
Flavio COLA
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.)
VHIT SpA
Original Assignee
VHIT SpA
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 VHIT SpA filed Critical VHIT SpA
Publication of EP3240958A1 publication Critical patent/EP3240958A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
    • F04C29/126—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type
    • F04C29/128—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type of the elastic type, e.g. reed valves
    • 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
    • F04C2220/00—Application
    • F04C2220/10—Vacuum
    • 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
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/46—Conditions in the working chamber

Definitions

  • the present invention relates to a rotary pump for fluids, and more specifically it concerns a lubricated rotary vacuum pump, applied to an electric motor.
  • the invention is applied in vacuum pumps intended to be interfaced with a thermal engine, and the following description will mainly refer to such a preferred application.
  • pumps of this kind is a lubricated rotary pump made in 1976 by firm D. Bonaldi & C. and employed on car Fiat Dino (equipped with Ferrari engine).
  • electric rotary vacuum pumps unlike mechanical pumps, are not connected to the engine shaft in order to rotate with it, but they are on the contrary used according to a discontinuous operation for reasons of energy saving and are subjected to be repeatedly turned on and off.
  • vacuum pumps of the above-specified kind have some drawbacks.
  • a drawback is that, in the periods in which said prior art vacuum pump is off and the thermal engine is operating, oil from the lubrication circuit of the thermal engine accumulates inside the pump and generates a pressure, in particular in the area of the vacuum chamber between the vane and the tangency point, thereby affecting the area of the suction valve, which could cause oil to flow back towards the utilisation devices with consequent considerable damages.
  • a further drawback is that, even if a non-return valve is used as a suction valve having a high sealing quality, there is anyway a high risk that oil flows back for instance towards the servo-brake.
  • FIG. 1 is a front view of a first embodiment of a rotary pump for fluids according to the present invention
  • FIG. 2 is a sectional view of the first embodiment of the rotary pump for fluids according to the present invention
  • FIG. 3 is a schematic view of a detail of the first embodiment of the rotary pump for fluids according to the present invention
  • FIG. 4 is a schematic view of a detail of a second embodiment of the rotary pump for fluids according to the present invention.
  • FIG. 5 is a schematic view of a detail of a third embodiment of the rotary pump for fluids according to the present invention.
  • a rotary electric pump for fluids e. g. a vacuum pump 10, according to the present invention, to which reference will be made hereinafter.
  • Vacuum pump 10 includes a hollow body 11 and is for instance a single-vane electric pump including a rotor and a vane of known type, not shown in the drawings.
  • the pump is intended to be interfaced with a thermal engine equipped with a lubrication circuit, known per se.
  • the rotary electric pump is a multiple-vane pump.
  • Body 11 is a housing defining a substantially cylindrical cavity 25 in which the rotor and the vane are mounted in known manner and in which there are provided parts 125 to be lubricated, at least one suction chamber 126 and at least one discharge chamber 127.
  • Said body 11 has at least a first inlet port 112 and an outlet port 115, shown in Fig. 1, and preferably an electric connector 14.
  • body 11 has a second inlet port 113.
  • a primary vacuum inlet valve 12 and a secondary vacuum inlet valve 13 are mounted on inlet ports 112 and 113, respectively, each valve being connected with a respective suction channel for the inflow of a fluid into cavity 25.
  • Outlet port 115 is in turn connected with a discharge duct and a non-return discharge reed valve 15 allowing fluid outflow from cavity 25.
  • Body 11 is preferably made of a metallic material, more preferably of aluminium alloy, or even of a thermoplastic, thermosetting or composite material.
  • body 11 is closed in fluid-tight manner, for instance through a seal, by a lid 106, so as to define cavity 25.
  • Lubrication oil is sent under pressure into cavity 25 through a bore 118 formed in body 11 and through suitable first and second ducts for lubrication under pressure (lubrication ducts) 120, 20.
  • Such oil after having lubricated the pump, by becoming mixed with sucked air, will form a mixture that will be discharged into the engine through non-return discharge reed valve 15.
  • vacuum pump 10 includes a non-return drain valve (closing valve) 16 of the reed type, consisting of a resilient plate (reed) 18 and a stop plate 28 secured to body 11 for instance by means of a screw 19 associated with a washer.
  • Reed 18 is arranged to close both the second lubrication duct 20, through which pressurised oil arrives into cavity 25, and a connecting duct 21.
  • the second lubrication duct 20, made for instance of two ducts 20', 20" is connected through the first lubrication duct 120 to bore 118 through which oil inflows into the pump, and it establishes communication of the lubrication circuit of the thermal engine with pump parts to be lubricated 125.
  • Connecting duct 21 is permanently connected with pump suction chamber 126 and it has a mouth 26 connected selectively and in controlled manner with the pump outside at a pressure close to atmospheric pressure, corresponding to a low-pressure region of the thermal engine. Mouth 26 has, towards the outside, a section with a larger area than the section of lubrication duct 20.
  • vacuum pump According to a second embodiment of the invention, shown in Fig. 4, vacuum pump
  • a non-return drain valve (closing valve) 16a of the reed type that, besides the components described above for closing valve 16 of the first embodiment of the invention, includes a shutter valve 22 located inside the second lubrication duct 20' and a spring 23 connected to shutter valve 22.
  • Shutter valve 22 further has an annular passageway 27 allowing oil to pass from the first lubrication duct 120 to the second lubrication duct 20" when the passageway is at the level of said first lubrication duct 120.
  • vacuum pump shown in Fig. 5
  • a non -return drain valve 16b closing valve
  • a sucker seal 24 placed in abutment against a step formed between mouth 26 and connecting duct 21.
  • lubricated electric rotary vacuum pumps are used according to a discontinuous operation and are subjected to be repeatedly turned on and off.
  • Vacuum pump 10 when it is on, generates a vacuum in suction chamber 126 and such a vacuum, by acting on reed 18 through connecting duct 21, generates a force proportional to the area of mouth 26 and to the vacuum in suction chamber 126.
  • Vacuum pump 10 when it is on, generates a vacuum in suction chamber 126 and such a vacuum, by acting on reed 18 through connecting duct 21, generates a force proportional to the area of mouth 26 and to the vacuum in suction chamber 126.
  • a force besides ensuring closure of connecting duct 21 itself, operates shutter valve 22 by overcoming the force exerted thereon by spring 23, and shifts the shutter valve downwards and makes annular passageway 27 arrive at the level of the first lubrication duct 120. In this manner, pressurised oil can enter the pump and perform in known manner the lubrication and liquid seal functions.
  • Vacuum pump 10 when it is on, generates a vacuum in suction chamber 126 and such a vacuum, by acting on reed 18 through connecting duct 21, generates, with the help of the flow of air initially sucked and licking sucker seal 24, a force proportional to the area of mouth 26 and to the vacuum in suction chamber 126.
  • a force besides ensuring closure of connecting duct 21 itself, operates shutter valve 22 by overcoming the force exerted thereon by spring 23, and shifts the shutter valve downwards and makes annular passageway 27 arrive at the level of the first lubrication duct 120. In this manner, pressurised oil can enter the pump and perform in known manner the lubrication and liquid seal functions.

Landscapes

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

Abstract

Pompe pour fluides (10) comprenant un corps creux (11) comportant une cavité sensiblement cylindrique (25) où un rotor et au moins une aube sont montés. La cavité est reliée à au moins un orifice d'entrée (112, 113) et à un orifice de sortie (115) conçus respectivement pour permettre l'écoulement entrant d'un fluide dans la cavité interne et l'écoulement sortant du fluide à l'extérieur de la cavité interne. La pompe comprend également au moins un clapet d'entrée sous vide (12, 13) monté sur l'orifice d'entrée respectif (112, 113) et relié à un canal d'aspiration pour l'écoulement entrant d'un fluide dans la cavité, et un clapet de sortie (15) monté sur l'orifice de sortie (115) et relié à un canal de sortie pour l'écoulement sortant du fluide à l'extérieur de la cavité. La pompe comprend en outre un trou (118), un premier conduit de lubrification (120) et un second conduit de lubrification (20), formés dans le corps (11) et raccordés l'un à l'autre, dans lesquels de l'huile de lubrification est envoyée dans la cavité depuis un circuit de lubrification. La pompe comprend enfin un conduit de raccordement (21) conçu pour raccorder la cavité de la pompe à une région à pression atmosphérique à l'extérieur de la pompe, et une soupape de vidange (16) conçue pour raccorder sélectivement soit le second conduit de lubrification (20) à la cavité de pompe soit le conduit de raccordement (21) à la région à pression atmosphérique à l'extérieur de la pompe.
EP15841050.6A 2014-12-29 2015-12-28 Pompe à fluide rotative Withdrawn EP3240958A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20141112 2014-12-29
PCT/IB2015/060006 WO2016108171A1 (fr) 2014-12-29 2015-12-28 Pompe à fluide rotative

Publications (1)

Publication Number Publication Date
EP3240958A1 true EP3240958A1 (fr) 2017-11-08

Family

ID=52633502

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15841050.6A Withdrawn EP3240958A1 (fr) 2014-12-29 2015-12-28 Pompe à fluide rotative

Country Status (2)

Country Link
EP (1) EP3240958A1 (fr)
WO (1) WO2016108171A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2564100B (en) * 2017-05-15 2021-12-08 Hydro Int Ltd A wastewater treatment device
CN110678656B (zh) 2017-06-09 2021-10-29 威伯科欧洲有限责任公司 将减小冷起动扭矩的真空泵簧片阀

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3874300B2 (ja) * 2005-02-16 2007-01-31 大豊工業株式会社 ベーンポンプ
JP2012067730A (ja) * 2010-09-27 2012-04-05 Taiho Kogyo Co Ltd ベーンポンプ

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2016108171A1 *

Also Published As

Publication number Publication date
WO2016108171A1 (fr) 2016-07-07

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