EP3475574B1 - Pompe à gaz à palettes fonctionnant à sec - Google Patents

Pompe à gaz à palettes fonctionnant à sec Download PDF

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Publication number
EP3475574B1
EP3475574B1 EP17713583.7A EP17713583A EP3475574B1 EP 3475574 B1 EP3475574 B1 EP 3475574B1 EP 17713583 A EP17713583 A EP 17713583A EP 3475574 B1 EP3475574 B1 EP 3475574B1
Authority
EP
European Patent Office
Prior art keywords
fluid outlet
pump
dry
outlet opening
gas pump
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.)
Active
Application number
EP17713583.7A
Other languages
German (de)
English (en)
Other versions
EP3475574A1 (fr
Inventor
Tobias GRÜNE
Nabil Salim AL-HASAN
Steffen Schnurr
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.)
Pierburg Pump Technology GmbH
Original Assignee
Pierburg Pump Technology 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 Pierburg Pump Technology GmbH filed Critical Pierburg Pump Technology GmbH
Publication of EP3475574A1 publication Critical patent/EP3475574A1/fr
Application granted granted Critical
Publication of EP3475574B1 publication Critical patent/EP3475574B1/fr
Active legal-status Critical Current
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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
    • 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
    • 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
    • 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
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/06—Silencing
    • F04C29/065—Noise dampening volumes, e.g. muffler chambers
    • 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
    • F04C2220/00—Application
    • F04C2220/10—Vacuum
    • F04C2220/12—Dry running
    • 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
    • F04C2250/00—Geometry
    • F04C2250/20—Geometry of the rotor
    • 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 invention relates to a dry-running vane gas pump.
  • Vane-type gas pumps of this type are known from the prior art and are usually used in motor vehicles as so-called vacuum pumps in combination with a brake booster.
  • the vane pump provides the vacuum required to operate the brake booster, which is generally 100 mbar or less.
  • the vane-cell gas pumps known from the prior art are usually dry-running or oil-lubricated vane-cell gas pumps, with no lubricant being fed into the pump chamber in the case of dry-running gas pumps.
  • oil-lubricated vane pumps the air emerging from the pump chamber is mixed with lubricant, the air-lubricant mixture having to be separated into its components before the disposal of this air-lubricant mixture.
  • the contamination of the air leaving the pump chamber can be avoided.
  • the omission of the lubricant leads to increased wear of the components moving relative to one another, in particular the slide elements. The wear is usually reduced to a minimum by the targeted selection of suitable material pairings of the components which are in contact with one another and move relatively to one another.
  • Such a dry-running vane gas pump is in the EP 2 568 180 A1 disclosed.
  • the vane pump has a pump housing which forms a pumping chamber.
  • a pump rotor is arranged in the pump chamber and has five radially displaceable slide elements.
  • the pump rotor is rotatably connected to an electric motor and is driven by it.
  • the slide elements shift due to the centrifugal force acting on the slide elements in such a way that their heads rest on a peripheral wall of the pump chamber, with two adjacent slide elements each delimiting a pump compartment together with the pump rotor and the pump housing.
  • a fluid inlet opening and two fluid outlet openings are formed in the pump housing, the fluid inlet opening and the fluid outlet openings being assigned to the pump chamber. Both fluid outlet openings each have a check valve, so that the fluid outlet openings are only released from a pre-defined excess pressure prevailing in the pump compartment.
  • both the check valve assigned to the first fluid outlet opening and the check valve assigned to the second fluid outlet opening prevent the pressureless air from flowing out, so that there is always a certain excess pressure in the pump compartment in the outlet sector.
  • the slide elements are mechanically loaded, whereby the mechanical wear of the slide elements, the power consumption of the electric motor and the achievable final pressure increase.
  • the invention is therefore based on the object of avoiding the disadvantage mentioned above.
  • the dry-running gas pump has a pump housing which delimits a pump chamber.
  • a pump rotor is arranged in the pump chamber and is driven either electrically by an electric motor or mechanically by an internal combustion engine.
  • the pump rotor is arranged eccentrically in the pump chamber and lies in a sealing sector on the peripheral wall of the pump chamber, thereby creating a crescent-shaped working space.
  • At least one slidable slide element is mounted in the pump rotor.
  • the pump rotor has a slide slot in which the at least one slide element is arranged to be displaceable.
  • the at least one slide element shifts due to the centrifugal force acting on the slide element such that the slide element always rests with its head on the peripheral wall of the pump chamber.
  • the at least one slide element can be spring-loaded, so that the head of the at least one slide element rests against the peripheral wall of the pump chamber due to the spring force, even at low speeds.
  • the function of the pump chamber is divided into an inlet, an outlet and a sealing sector.
  • a fluid inlet opening is arranged in the inlet sector and is fluidly connected, for example, to a vacuum chamber of a brake booster.
  • a first fluid outlet opening and a second fluid outlet opening are arranged in the outlet sector, the pump chamber being connectable to the environment via the fluid outlet openings.
  • the sealing sector which prevents a gas flow between the fluid inlet opening and the fluid outlet openings, is arranged between the fluid outlet openings and the fluid inlet opening, as seen in the direction of rotation.
  • the first fluid outlet opening is arranged upstream of the second fluid outlet opening in the direction of rotation of the pump rotor, a check valve being associated with the first fluid outlet opening.
  • the check valve closes the first fluid outlet opening and releases it from a pre-defined excess pressure in the pump compartment.
  • the second fluid outlet opening has no check valve, so that the second fluid outlet opening is permanently open.
  • air is drawn into the passing pump compartment via the fluid inlet opening and expelled from the pump compartment via the first and second fluid outlet openings.
  • the air is expelled through the first fluid outlet opening as long as a pressure prevailing in the pump compartment exceeds the opening pressure required to actuate the check valve.
  • the air is expelled through the second fluid outlet opening, with no check valve being assigned to the second fluid outlet opening, so that the air can flow out of the pump compartment without resistance. Because no check valve is assigned to the second fluid outlet opening and the air can be expelled from the pump compartment without any resistance, excess pressure is avoided in this area. As a result, the mechanical load on the at least one slide element is reduced and the wear on the at least one slide element is reduced.
  • At least two slide elements are preferably mounted in the pump rotor, as a result of which the hydraulic efficiency of the vane pump is increased by the leakage between the pressure side and the suction side being considerably reduced with an increasing number of slide elements.
  • the angular distance between the first fluid outlet opening and the second fluid outlet opening is smaller than the pumping angle.
  • the angular distance is defined as the angular distance between the trailing edge of the first fluid outlet opening and the leading edge of the second fluid outlet opening.
  • the pump compartment angle is defined by two adjacent slide elements. Because the angular distance between the first and the second fluid outlet opening is smaller than the pump compartment angle, the pump compartment in the outlet sector is fluidly connected to at least one fluid outlet opening at all times. In this way, a pressure build-up in the pump compartment is avoided, which would arise if the pump compartment in the outlet sector were briefly fluidly connected to neither of the two fluid outlet openings and the air to be expelled could not flow out. This reduces the mechanical tangential load on the slide element.
  • the tangential width B1 of the at least one slide element preferably corresponds to at least the tangential width B2 of the first fluid outlet opening, as a result of which the second fluid outlet opening is completely covered and briefly closed when the at least one slide element passes over it. This prevents a short circuit between the pump compartments delimiting by the at least one slide element and increases the pneumatic efficiency of the gas pump.
  • At least the head of the at least one slide element consists of graphite. Dry lubrication takes place in this way, the head of the slide element made of graphite wearing out in a controlled manner as the service life progresses.
  • Graphite is relatively soft. In particular in the case of a slide element head made of graphite, the mechanical wear of the head is considerably reduced by the invention.
  • the pump housing preferably has a valve cover, a cam ring and a bottom cover.
  • the cam ring forms the circumferential surface of the pump chamber and rests with its end face against the valve cover and with its other end face against the bottom cover.
  • the valve cover closes the pump chamber on one side and has the at least two fluid outlet openings.
  • the base element preferably has the fluid inlet opening.
  • the check valve is a reed valve with a travel limiter.
  • a check valve is inexpensive to manufacture, reliable and easy to install.
  • the Figure 1 shows a vane cell gas pump 10 designed as a so-called vacuum pump, which is intended, for example, for use in a motor vehicle and can generate an absolute pressure of, for example, 100 mbar or less.
  • the vane pump 10 has a metal pump housing 20 which forms a pump chamber 22.
  • the pump housing 20 is essentially composed of a cam ring 74, a base plate 76 and a valve cover 72.
  • a pump rotor 30 is rotatably arranged in the pump chamber 22 eccentrically to the center of gravity of the pump chamber 22.
  • the Pump rotor 30 has five slide slots 321, 341, 361, 381, 401, in each of which a slide element 32, 34, 36, 38, 40 is slidably mounted.
  • the five slide elements 32, 34, 36, 38, 40 divide the pump chamber 22 into five rotating pump compartments, each of which has the same pump compartment angle a.
  • the pump rotor 30 is driven by an electric motor 90.
  • the pump chamber 22 can be divided into several sectors, namely an inlet sector 42 with a fluid inlet opening 60, an outlet sector 44 with a first fluid outlet opening 52 and a second fluid outlet opening 54 and a sealing sector 46, which is arranged in the direction of rotation between the outlet sector 44 and the inlet sector 42 and prevents gas flow from the fluid outlet ports 52, 54 to the fluid inlet port 60.
  • the fluid inlet opening 60 is formed in the bottom plate 76.
  • the two fluid outlet openings 52, 54 are formed in the valve cover 72.
  • the first fluid outlet opening 52 is arranged in the direction of rotation of the pump rotor 30 in front of the second fluid outlet opening 54.
  • the first fluid outlet opening 52 is fluidly assigned a check valve 70, the check valve 70 being a tongue valve and having a valve tongue 80 and a travel limiter 82, both of which are fixedly arranged on the valve cover 72.
  • No valve is assigned to the second fluid outlet opening 54, so that the second fluid outlet opening 54 is permanently open and permits a fluid flow without resistance.
  • the second fluid outlet opening 54 is spaced at an angular distance b from the first fluid outlet opening 52, the angular distance b being measured between a leading edge of the second fluid outlet opening 54 and the trailing edge of the first fluid outlet opening 52.
  • the angular distance b is smaller than one by two Adjacent slide elements 32, 34, 36, 38, 40 included pump compartment angle a, so that a pump compartment passing through the outlet sector 44 is always fluidly connected to at least one fluid outlet opening 52, 54.
  • the air is sucked in by the rotation of the pump rotor 30 through the fluid inlet opening 60 and is expelled from the pump compartment through the two fluid outlet openings 52, 54.
  • the first fluid outlet opening 52 is released and the air is expelled through the first fluid outlet opening 52.
  • the air is exhausted through the second fluid outlet port 54. Because no valve is assigned to the second fluid outlet opening 54, the air is expelled without resistance, and no pressure build-up generated by the check valve is generated. In this way, the tangential load on the slide elements 32, 34, 36, 38, 40 decreases and the wear on the slide elements 32, 34, 36, 38, 40 is reduced. In addition, the power consumption of the electric motor 90 is reduced and the achievable final pressure is reduced.
  • the number of slide elements can vary or the fluid inlet opening and / or the fluid outlet openings can be formed on other housing components.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Rotary Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Claims (8)

  1. Pompe à gaz à palettes fonctionnant à sec (10), avec
    un carter de pompe (20) formant une chambre de pompage (22), dans laquelle un rotor de pompe (30) avec au moins un élément de coulisseau déplaçable (32, 34, 36, 38, 40) est supporté de manière rotative,
    au moins une ouverture d'entrée de fluide (60) et au moins deux ouvertures de sortie de fluide (52, 54) étant associées à la chambre de pompage (22), et
    une première ouverture de sortie de fluide (52) des au moins deux ouvertures de sortie de fluide (52, 54) pouvant être fermée par un clapet anti-retour (70),
    caractérisée en ce qu'
    une deuxième ouverture de sortie de fluide (54) des au moins deux ouvertures de sortie de fluide (52, 54) est ouverte en permanence,
    la première ouverture de sortie de fluide (52) étant disposée devant la seconde ouverture de sortie de fluide (54), vu dans le sens de rotation du rotor de pompe (30).
  2. Pompe à gaz à palettes fonctionnant à sec (10) selon la revendication 1, caractérisée en ce qu'au moins deux éléments de coulisseau (32, 34, 36, 38, 40) sont supportés dans le rotor de pompe (30).
  3. Pompe à gaz à palettes fonctionnant à sec (10) selon l'une quelconque des revendications précédentes, caractérisée en ce que la distance angulaire b entre la première ouverture de sortie de fluide (52) et la deuxième ouverture de sortie de fluide (54) est plus petite que l'angle de la poche de pompage a, l'angle de la poche de pompage a étant inclus par deux éléments de coulisseau adjacents (32, 34, 36, 38, 40).
  4. Pompe à gaz à palettes fonctionnant à sec (10) selon l'une quelconque des revendications précédentes, caractérisée en ce que la largeur B1 dudit élément de coulisseau (32, 34, 36, 38, 40) est au moins égale à la largeur tangentielle B2 de la première ouverture de sortie de fluide (54).
  5. Pompe à gaz à palettes fonctionnant à sec (10) selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins la tête (62) de l'au moins un élément de coulisseau (32, 34, 36, 38, 40) est fabriquée en graphite.
  6. Pompe à gaz à palettes fonctionnant à sec (10) selon l'une quelconque des revendications précédentes, caractérisée en ce que le carter (20) a un couvercle de soupape (72), un anneau de levée (74) et un couvercle de fond (76), définissant une chambre de pompage (22), le couvercle de soupape (72) ayant les au moins deux ouvertures de sortie de fluide (52, 54).
  7. Pompe à gaz à palettes fonctionnant à sec (10) selon la revendication 6, caractérisée en ce que l'ouverture d'entrée de fluide (60) est formée dans le couvercle de fond.
  8. Pompe à gaz à palettes fonctionnant à sec (10) selon l'une quelconque des revendications précédentes, caractérisée en ce que le clapet anti-retour (70) est un clapet à lames (80) avec un limiteur de course (82).
EP17713583.7A 2016-06-22 2017-02-01 Pompe à gaz à palettes fonctionnant à sec Active EP3475574B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/EP2016/064429 WO2017220141A1 (fr) 2016-06-22 2016-06-22 Ensemble de pompes à vides de véhicule automobile
PCT/EP2017/052166 WO2017220212A1 (fr) 2016-06-22 2017-02-01 Pompe à gaz à palettes fonctionnant à sec

Publications (2)

Publication Number Publication Date
EP3475574A1 EP3475574A1 (fr) 2019-05-01
EP3475574B1 true EP3475574B1 (fr) 2020-04-01

Family

ID=56194488

Family Applications (2)

Application Number Title Priority Date Filing Date
EP16731591.0A Active EP3475573B1 (fr) 2016-06-22 2016-06-22 Ensemble de pompes à vides de véhicule automobile
EP17713583.7A Active EP3475574B1 (fr) 2016-06-22 2017-02-01 Pompe à gaz à palettes fonctionnant à sec

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP16731591.0A Active EP3475573B1 (fr) 2016-06-22 2016-06-22 Ensemble de pompes à vides de véhicule automobile

Country Status (5)

Country Link
US (2) US11261869B2 (fr)
EP (2) EP3475573B1 (fr)
JP (1) JP2019518905A (fr)
CN (2) CN109154293B (fr)
WO (2) WO2017220141A1 (fr)

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US11261868B2 (en) * 2017-02-01 2022-03-01 Pierburg Pump Technology Gmbh Vane gas pump with sliding element trmporaily completely covering the elongated fluid outlet opening
CN113374691B (zh) * 2021-06-04 2023-01-20 淄博真空设备厂有限公司 一种汽车节能真空泵

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CN109154293B (zh) 2021-04-13
EP3475573B1 (fr) 2020-08-05
US20190323506A1 (en) 2019-10-24
WO2017220141A1 (fr) 2017-12-28
US20200309134A1 (en) 2020-10-01
CN109154294B (zh) 2019-12-31
CN109154293A (zh) 2019-01-04
WO2017220212A1 (fr) 2017-12-28
CN109154294A (zh) 2019-01-04
EP3475574A1 (fr) 2019-05-01
EP3475573A1 (fr) 2019-05-01
US11261869B2 (en) 2022-03-01
JP2019518905A (ja) 2019-07-04
US10995757B2 (en) 2021-05-04

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