EP3090184B1 - Pompe rotative à soupape de sécurité et son procédé de fonctionnement - Google Patents

Pompe rotative à soupape de sécurité et son procédé de fonctionnement Download PDF

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Publication number
EP3090184B1
EP3090184B1 EP14830728.3A EP14830728A EP3090184B1 EP 3090184 B1 EP3090184 B1 EP 3090184B1 EP 14830728 A EP14830728 A EP 14830728A EP 3090184 B1 EP3090184 B1 EP 3090184B1
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EP
European Patent Office
Prior art keywords
discharge
chamber
rotor
discharge outlet
internal wall
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EP14830728.3A
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German (de)
English (en)
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EP3090184A1 (fr
Inventor
Alessandro Fauda
Leonardo Cadeddu
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VHIT SpA
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VHIT SpA
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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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to rotary pumps, and more specifically it concerns a safety valve for a rotary pump.
  • the invention is applied in the so-called single-vane pumps, i.e. pumps where the rotor includes a single vane with constant length, and the following description will mainly refer to this preferred application.
  • Single-vane pumps are often used as vacuum pumps, for instance in the automotive field. They comprise a body defining a chamber, for instance with approximately elliptical cross section, in which the rotor rotates, substantially in tangential contact, about an eccentric axis.
  • the rotor has a diametrical slot where the vane is mounted and the vane is radially movable in the slot so that, while the rotor is rotating, the vane ends slide substantially in contact with the internal wall of the chamber.
  • the chamber is divided by the rotor and the vane into a suction room and a pressure room, between which a pumped fluid is displaced.
  • a problem that can arise in known rotary pumps is due to the presence of oil within the pump, which takes place for instance if the suction valve(s) do(es) not have a perfect seal or, when the engine is stopped, because of oil suction into the pump.
  • the phenomenon of oil suction may be due to the permanence of a depression inside the pump for relatively short but significant periods, occurring when the engine is turned off: such oil, if it is not discharged, can give rise to problems at the cold start of the engine.
  • Document EP 1890040 discloses an example of rotary vacuum pump having a safety valve with a movable, swivelling vane, a bypass connection and a tank for storage of the residual oil.
  • the safety valve is an additional valve that can be combined with the discharge valve of the pump.
  • Document WO 2008/005291 discloses a rotary vacuum pump comprising a pressure relief valve via which a suction chamber of the vacuum pump can be connected to a decompressed area through a pressure relief channel.
  • pumps are known in which an opening is formed for discharging, through a one-way valve, fluid that has been sucked or is any case present inside them.
  • the safety valve is usually coaxially formed with the rotation axis of the rotor and directly discharges the fluid into the support onto which the pump is flanged.
  • the flow area of the discharged fluid is insufficient to ensure the discharge of the fluid when the latter mainly consists of a liquid that is very dense by its nature or whose density has increased because of the low temperature.
  • this is achieved by means of a rotary pump comprising an interspace formed within the pump housing near the area of tangency between the rotor and the internal wall of the pumping chamber.
  • the interspace communicates with the pumping chamber through the discharge outlet of a safety valve and is connected to a discharge duct arranged to discharge the fluid outside the pumping chamber.
  • the discharge outlet is formed with a radial opening relative to the axis of the pumping chamber and radially discharges the fluid.
  • the invention also provides a method of operating a rotary pump, comprising a discharge step in which the fluid to be compressed is discharged from the safety valve in a radial direction relative to the axis of the pumping chamber through the discharge outlet
  • a pump 50 includes a housing 40 defining a pumping chamber 15, for instance with approximately elliptical cross section, having an internal wall 42.
  • Chamber 15 accommodates a rotor 18 that, in known manner, rotates in substantially tangential contact with said internal wall 42 in correspondence of an area of tangency 17.
  • the rotor has a radial slot in which a vane 22, radially slidable within the same slot, is mounted.
  • the vane and the rotor divide chamber 15 into a suction chamber 33, into which a fluid to be compressed is sucked, and a compression chamber 38 in which the fluid is compressed.
  • Pump 50 further comprises a suction duct 10, ending into suction chamber 33, through the suction valve of known type (not shown) from which the fluid to be compressed is sucked, and a discharge duct 16, which ends into compression chamber 38 through the discharge valve of known type (not shown) and is arranged to discharge the fluid outside pumping chamber 15.
  • the vacuum pump according to the invention shown in Figs. 1 and 2 includes a safety valve 20, formed in the internal wall 42 near the area of tangency 17 between rotor 18 and internal wall 42 and adapted to discharge a residual fluid, e.g. oil remained within pumping chamber 15, outside the chamber.
  • a safety valve 20 formed in the internal wall 42 near the area of tangency 17 between rotor 18 and internal wall 42 and adapted to discharge a residual fluid, e.g. oil remained within pumping chamber 15, outside the chamber.
  • Safety valve 20 includes a discharge outlet 11, 12 formed in pumping chamber 15 in a zone adjacent to the area of tangency 17 between rotor 18 and internal wall 42 of the chamber.
  • Discharge outlet 11, 12 puts pumping chamber 15 in communication with an interspace 35 formed within housing 40, and it is formed with a radial opening relative to the axis of pumping chamber 15.
  • safety valve 20 includes a first discharge outlet 11 formed in suction chamber 33, preferably in a zone of internal wall 42 between the inlet of suction duct 10 and the area of tangency 17.
  • safety valve 20 further includes a second discharge outlet 12 formed in compression chamber 38, preferably in a zone of internal wall 42 between the inlet of the discharge valve and the area of tangency 17. Both discharge outlets end into discharge duct 16.
  • the first discharge outlet 11 and the second discharge outlet 12 can put suction chamber 33 and compression chamber 38, respectively, in communication with interspace 35.
  • Interspace 35 in turn is permanently connected to discharge duct 16 adapted to discharge the fluid, e.g. the residual fluid discharged from pumping chamber 15 through safety valve 20, outside interspace 35.
  • Discharge outlets 11, 12 are radial openings relative to the axis of pumping chamber 15, and they are formed on internal wall 42 of chamber 15 in the region of tangency between rotor 18 and internal wall 42, in correspondence of the suction and discharge regions.
  • Outlets 11, 12 are closed by a flexible or rigid lamina 13 mounted in abutment against the internal wall of interspace 35.
  • Lamina 13 is made of metal, e.g. spring steel in case of a flexible lamina and steel sheet in case of rigid lamina, or of a composite polymer such as Kevlar, or of carbon fibres, and is shaped in known manner so as to ensure the closure of outlets 11, 12.
  • Lamina 13 is maintained in abutment against the internal wall of interspace 35 by a spring 14, for instance a leaf spring 14 articulated in a seat 19 formed on the external wall of interspace 35.
  • lamina 13 is maintained in abutment by two leaf springs.
  • lamina 13 is maintained in abutment by only one spring, located between the first discharge outlet 11 and the second discharge outlet 12.
  • the invention also concerns a method of operating a rotary pump 50 connectable to a thermal engine, said pump 50 comprising: a pumping chamber 15; a rotor 18 adapted to rotate substantially tangentially to an internal wall 42 of said pumping chamber 15; a vane 22 mounted radially slidable within a slot formed in rotor 18; a safety valve 20 formed in the internal wall 42 and having a discharge outlet 11, 12 formed with a radial opening relative to the axis of pumping chamber 15; said pumping chamber 15 being divided by vane 22 and rotor 18 into a suction chamber 33 and a compression chamber 38; said method comprising the following steps occurring twice at each revolution of the rotor:
  • the first discharge outlet 11 of safety valve 20 opens due to the action of the pressurised fluid that displaces lamina 13 by overcoming the force exerted by leaf spring 14, thereby allowing the fluid to be discharged into interspace 35 and hence into discharge duct 16.
  • the second discharge outlet 12 of safety valve 20 can operate in two different modes.
  • leaf spring 14 is so constructed as to make the second discharge outlet 12 open at the normal discharge pressures.
  • the valve increases the amount of fluid being discharged through the discharge duct both under the normal operating conditions and in case of cold start at low temperature in the presence of liquid made very dense because of the temperature in the compression chamber.
  • leaf spring 14 is so constructed as to make the second discharge outlet 12 open at pressures higher than the normal discharge pressures.
  • the valve increases the amount of fluid being discharged through the discharge duct only in case of cold start at low temperature in the presence of liquid in the compression chamber, thereby saving the pump integrity.
  • safety valve 20 in both operating manners, having radial discharge outlets 11, 12 with large areas, located close to and spanning the area of tangency between rotor 18 and housing 40, allows having very wide flow areas for the fluid to be discharged.
  • safety valve 20 thanks to the provision of interspace 35, allows forming discharge duct 16 connected to the interspace in the region of housing 40 that is the most suitable for accommodating said duct, thereby allowing keeping wide discharge cross sectional areas over the whole path from discharge outlets 11, 12 to discharge duct 16.
  • the rotary pump with safety valve according to the invention allows making a device having a simplified structure and occupying a reduced space in comparison with the known pumps.

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

Claims (12)

  1. Pompe rotative (50) pouvant être raccordée à un moteur thermique, comprenant :
    un carter (40) comprenant une chambre de pompage (15) ayant une paroi interne (42);
    un rotor (18) conçu pour tourner en contact tangentiel avec ladite paroi interne (42) en correspondance d'une zone de tangence (17) entre le rotor (18) et la paroi interne (42) ;
    une aube (22) montée radialement coulissante à l'intérieur d'une fente formée dans le rotor (18), pendant la rotation du rotor (18), ladite chambre de pompage (15) étant divisée par l'aube (22) et le rotor (18) en une chambre d'aspiration (33) dans laquelle un fluide à comprimer est aspiré, et une chambre de compression (38) dans laquelle le fluide est comprimé ;
    un conduit d'aspiration (10), qui se termine dans la chambre d'aspiration (33), et un conduit de refoulement (16), qui se termine dans la chambre de compression (38) et qui est conçu pour refouler le fluide hors de la chambre de compression (38) ;
    une soupape de sécurité (20), formée dans la paroi interne (42) adjacente à la zone de tangence (17) entre le rotor (18) et la paroi interne (42) et conçue pour refouler un fluide résiduel hors de la chambre de pompage (15) ;
    une première sortie de refoulement (11) de la soupape de sécurité (20), formée dans la chambre d'aspiration (33) dans une zone adjacente à la zone de tangence (17) entre le rotor (18) et la paroi interne (42) de la chambre de pompage (15) ; et
    un espace intermédiaire (35) formé à l'intérieur du carter (40), ladite première sortie de refoulement (11) étant formée avec une ouverture radiale par rapport à l'axe de la chambre de pompage (15) et étant conçue pour mettre la chambre d'aspiration (33) en communication avec l'espace intermédiaire (35) ;
    la pompe étant caractérisée en ce que l'espace intermédiaire (35) est raccordé à un conduit de refoulement (16) conçu pour refouler un fluide résiduel hors de la chambre de pompage (15), et
    ledit conduit de refoulement (16) est raccordé audit espace intermédiaire (35), et en ce que
    ladite première sortie de refoulement (11) est conçue pour mettre la chambre d'aspiration (33) en communication avec le conduit de refoulement (16) à travers l'espace intermédiaire (35).
  2. Pompe rotative (50) selon la revendication 1, caractérisée en ce que ladite sortie de refoulement (11, 12) est fermée par une lame (13) montée en butée contre une paroi interne de l'espace intermédiaire (35), ladite lame (13) étant maintenue en butée par un ressort (14).
  3. Pompe rotative (50) selon la revendication 1 ou 2, caractérisée en ce que ladite soupape de sécurité (20) comprend une seconde sortie de refoulement (12) formée dans la chambre de compression (38), ladite seconde sortie de refoulement (12) étant formée avec une ouverture radiale par rapport à l'axe de la chambre de pompage (15) et étant conçue pour mettre la chambre de compression (38) en communication avec le conduit de refoulement (16) à travers l'espace intermédiaire (35).
  4. Pompe rotative (50) selon l'une quelconque des revendications 1 à 3, caractérisée en ce que ladite première sortie de refoulement (11) est formée dans une zone de la paroi interne (42) entre l'entrée d'un conduit d'aspiration (10) et la zone de tangence (17) entre le rotor (18) et la paroi interne (42) de la chambre de pompage (15).
  5. Pompe rotative (50) selon la revendication 3, caractérisée en ce que ladite seconde sortie de refoulement (12) est formée dans une zone de la paroi interne (42) entre l'entrée du conduit de refoulement (16) et la zone de tangence (17) entre le rotor (18) et la paroi interne (42) de la chambre de pompage (15).
  6. Pompe rotative (50) selon l'une quelconque des revendications 1 à 5, caractérisée en ce que ladite soupape de sécurité (20) comprend ladite première sortie de refoulement (11) et ladite seconde sortie de refoulement (12).
  7. Pompe rotative (50) selon l'une quelconque des revendications 2 à 6, caractérisée en ce que ladite lame (13) est maintenue en butée par deux ressorts (14).
  8. Pompe rotative (50) selon l'une quelconque des revendications 2 à 6, caractérisée en ce que ledit ressort est un ressort à lame (14) articulé dans un siège (19) formé dans la paroi extérieure de l'espace intermédiaire (35).
  9. Procédé de fonctionnement d'une pompe rotative (50) pouvant être raccordée à un moteur thermique, ladite pompe (50) comprenant : une chambre de pompage (15) ; un rotor (18) conçu pour tourner de manière sensiblement tangentielle à une paroi interne (42) de ladite chambre de pompage (15) ; une aube (22) montée radialement coulissante dans une fente formée dans le rotor (18) ; un espace intermédiaire (35) formé dans le carter (40) et raccordé à un conduit de refoulement (16) ; une soupape de sécurité (20) formée dans la paroi interne (42) et raccordant la chambre d'aspiration (33) à l'espace intermédiaire (35), la soupape de sécurité ayant une première sortie de refoulement (11) formée avec une ouverture radiale par rapport à l'axe de la chambre de pompage (15) ; ladite chambre de pompage (15) étant divisée par l'aube (22) et le rotor (18) en une chambre d'aspiration (33), dans laquelle est formée la première sortie de refoulement (11), et une chambre de compression (38) ; ledit procédé comprenant les étapes suivantes :
    une étape d'aspiration, dans laquelle le fluide à comprimer est aspiré dans la chambre d'aspiration (33) ;
    une étape d'isolation, dans laquelle le gaz aspiré est isolé, n'étant pas en communication avec le conduit d'aspiration et le conduit de refoulement ;
    une étape de compression, dans laquelle le fluide à comprimer est comprimé dans la chambre de compression (38) ;
    une étape de refoulement, dans laquelle le fluide à comprimer est refoulé à l'extérieur de la chambre de compression (38) à travers ledit conduit de refoulement (16) ;
    une autre étape de refoulement, dans laquelle le fluide à comprimer est refoulé de la soupape de sécurité (20), dans une direction radiale par rapport à l'axe de la chambre de pompage (15), à travers ladite première sortie de refoulement (11) et ledit premier conduit de refoulement (16).
  10. Procédé selon la revendication 9, ladite étape de refoulement comprenant en outre l'étape consistant à
    refouler le fluide aspiré dans la chambre d'aspiration (33) à travers ladite première sortie de refoulement (11) en cas de contre-rotation du moteur thermique.
  11. Procédé selon la revendication 9 ou 10, comprenant en outre les étapes consistant à
    munir ladite soupape de sécurité (20) d'une seconde sortie de refoulement (12) formée dans ladite chambre de compression (38) avec une ouverture radiale par rapport à l'axe de la chambre de pompage (15) ;
    refouler le fluide comprimé dans la chambre de compression (38) à travers la seconde sortie de refoulement (12) et ledit premier conduit de refoulement (16).
  12. Procédé selon la revendication 11, ladite étape de refoulement du fluide comprimé dans la chambre de compression (38) à travers ladite seconde sortie de refoulement (12) se produisant en cas de pression dans la chambre de compression (38) supérieure à une certaine pression de refoulement.
EP14830728.3A 2013-12-30 2014-12-23 Pompe rotative à soupape de sécurité et son procédé de fonctionnement Active EP3090184B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT001083A ITTO20131083A1 (it) 2013-12-30 2013-12-30 Pompa rotativa con valvola di sicurezza e metodo di funzionamento
PCT/IB2014/067269 WO2015101904A1 (fr) 2013-12-30 2014-12-23 Pompe rotative à soupape de sécurité et son procédé de fonctionnement

Publications (2)

Publication Number Publication Date
EP3090184A1 EP3090184A1 (fr) 2016-11-09
EP3090184B1 true EP3090184B1 (fr) 2019-05-08

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EP14830728.3A Active EP3090184B1 (fr) 2013-12-30 2014-12-23 Pompe rotative à soupape de sécurité et son procédé de fonctionnement

Country Status (3)

Country Link
EP (1) EP3090184B1 (fr)
IT (1) ITTO20131083A1 (fr)
WO (1) WO2015101904A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017128972A1 (de) * 2017-12-06 2019-06-06 Joma-Polytec Gmbh Vakuumpumpe

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB536934A (en) * 1940-04-08 1941-05-30 Edward John Beach Improvements in vacuum pumps
DE3819623A1 (de) * 1988-01-14 1989-07-27 Vdo Schindling Fluegelzellenpumpe
JPH02181087A (ja) * 1988-12-29 1990-07-13 Aisin Seiki Co Ltd 圧縮機
EP1563190A2 (fr) 2002-11-13 2005-08-17 LuK Automobiltechnik GmbH & Co. KG Pompe a vide
WO2008009251A1 (fr) * 2006-07-21 2008-01-24 Ixetic Hückeswagen Gmbh pompe À vide
DE102010044898A1 (de) * 2010-09-09 2012-03-15 Schwäbische Hüttenwerke Automotive GmbH Vakuumpumpe mit Lüftungseinrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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WO2015101904A1 (fr) 2015-07-09
EP3090184A1 (fr) 2016-11-09
ITTO20131083A1 (it) 2015-07-01

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