EP2470790A1 - Pompe à vide à compensation de pression - Google Patents

Pompe à vide à compensation de pression

Info

Publication number
EP2470790A1
EP2470790A1 EP10734095A EP10734095A EP2470790A1 EP 2470790 A1 EP2470790 A1 EP 2470790A1 EP 10734095 A EP10734095 A EP 10734095A EP 10734095 A EP10734095 A EP 10734095A EP 2470790 A1 EP2470790 A1 EP 2470790A1
Authority
EP
European Patent Office
Prior art keywords
vacuum pump
medium
environment
pump
outlet
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Withdrawn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
EP10734095A
Other languages
German (de)
English (en)
Inventor
Harry Fleig
Andre Johanning
Bertram Bauer
Hartmut Krueger
Harald Merz
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2470790A1 publication Critical patent/EP2470790A1/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Withdrawn legal-status Critical Current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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
    • F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
    • F04B37/14—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain 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
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • 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
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/28—Safety arrangements; Monitoring
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F04C15/064—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 machines or pumps
    • F04C15/066—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 machines or 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
    • 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

Definitions

  • Vacuum pumps are used for example on motor vehicles for different tasks.
  • a negative pressure in a pneumatic brake booster of a motor vehicle can be provided by a vacuum pump.
  • the brake booster In motor vehicles with gasoline engines whose mixture is prepared by means of a device with throttle, the brake booster is usually evacuated via the mixture processing device.
  • gasoline engines which have an injection system, and also in diesel engines, a throttle z.T. not necessary, and the suction effect of the gasoline or diesel engine in the mixture treatment device is not sufficient to generate a sufficient negative pressure in the brake booster in all operating conditions.
  • a vacuum built up in the brake booster is approximately constant. After a brake application, the brake booster is vented and must be evacuated again.
  • the vacuum pump therefore does not have to be operated during the entire service life of the motor vehicle, but can be switched on and off as a function of the negative pressure prevailing in the brake booster.
  • a check valve between the inlet side of the vacuum pump and the brake booster is usually provided.
  • An object of the present invention is to cure a vacuum pump against wear from sucked damaging substances.
  • a vacuum pump in particular for use in a motor vehicle, having an inlet side for aspirating a fluid medium and an outlet side for discharging the aspirated medium to an environment, has an outlet reflux barrier on the outlet side, which counteracts backflow of the medium from the environment wherein the outlet side has a pressure compensation element for compensating a negative pressure in the vacuum pump with respect to the environment and the pressure compensation element is adapted to counteract the entry of harmful substances from the environment into the vacuum pump.
  • the outlet check valve prevents an immediate flow of medium, such as air, into the vacuum pump when it is turned off after operation.
  • the pressure compensation element allows penetration of the medium from the environment in the vacuum pump without prejudice harmful substances to the vacuum pump. This is the result Vacuum pump suitable in particular for use in a motor vehicle, where the negative pressure pump harmful substances such as water, dust or oil are to be expected in the environment of the vacuum pump.
  • the pressure compensation element may be a particulate filter which retains particles of damaging substances whose size exceeds, for example, a certain particle size. Solid and liquid droplets can thus be retained in the filter, while air as a medium passes through the particle filter.
  • a particle filter allows a more compact construction than, for example, a compensation volume in the form of an outlet tube dimensioned as a function of the volume to be admitted.
  • the particle filter may be formed as a membrane which is permeable to the medium on one side.
  • a flow of medium through the pressure compensation element can only flow in one direction, so that separated particles collect only on one side of the membrane, namely the side which is in contact with the environment, which does not endanger the permeability of the membrane and prevents accumulation of particles in the area of the vacuum pump.
  • the medium can be gaseous and the membrane impermeable to liquid and solid substances.
  • the medium may be air and the membrane may be expanded polytetrafluoroethene (ePTFE, known under the proprietary trade name "Gore-Tex”), thus providing a proven and inexpensive membrane with good long-term performance.
  • ePTFE expanded polytetrafluoroethene
  • the outlet backflow barrier can be designed to be integrated with the particulate filter.
  • the inlet side of the vacuum pump may include a pump backflow stop to counteract flow of the medium from the vacuum pump to the inlet side.
  • the vacuum pump can be made vacuum-free outside of a pump operation, which relieves the pressure pump seals, which leads to increased operational safety.
  • the vacuum pump may be arranged for an intermittent pumping operation, so that during the pumping operation the medium is conveyed from the outlet side into the environment and, outside the pumping operation, a pressure gradient is reduced from the environment to the outlet side.
  • a control of the pumping plant can be dependent on a negative pressure in a container to be evacuated.
  • a pump controller may be integrated with the vacuum pump. The pump controller may control operation of the vacuum pump in response to a vacuum prevailing at the inlet side of the vacuum pump or at the pump backflow stop to provide a fully integrated vacuum unit.
  • Figure 1 is a vacuum system in a motor vehicle
  • FIG. 2 is a schematic representation of the construction of the vacuum pump of Figure 1;
  • FIGS. 3A and 3B show an integrated pressure compensation element for use in the vacuum pump from FIG. 2 in two different positions; and Figure 4 illustrates a filter element for use in the vacuum pump of Figure 2.
  • FIG. 1 shows a vacuum system 100 on board a motor vehicle 1 10.
  • a pneumatic brake booster 120 is connected to a gasoline engine 130 by means of a motor return flow barrier 140 such that the gasoline engine 130 can evacuate air from the brake booster 120.
  • the engine check valve 140 prevents backflow of air from the gasoline engine 130 in the brake booster 120, for example, when the gasoline engine 130 is turned off and generates no negative pressure.
  • a vacuum pump 150 is connected by means of a pump
  • Non-return valve 160 also connected to the brake booster 120, so the vacuum pump 150 is able to evacuate air from the brake booster 120 and prevent backflow of the medium from the vacuum pump 150 to the brake booster 120 through the pump backflow barrier 160.
  • the vacuum system 100 does not necessarily require the gasoline engine 130 and the engine check valve 140, but may also be constructed by the brake booster 120 and the vacuum pump 150 with or without the pump check valve 160.
  • the vacuum pump 150 may also be used in other constellations on a motor vehicle 110 or other technical device. In particular, the use of the vacuum pump 150 is not limited to evacuating the brake booster 120, but may involve evacuation of any fluid medium into an environment.
  • FIG. 2 shows a schematic diagram of the vacuum pump 150 with the pump backflow barrier 160 of Figure 1.
  • the symbols used correspond to ISO symbols for hydraulic systems.
  • the vacuum pump 150 includes a housing 210 in which a pump device 220 with an inlet side 230 and an outlet side 240, a pump motor 250 and an outlet
  • Reflux 260 and a pressure compensation element 270 are arranged.
  • the pump check valve 160 is connected to the inlet side 230 of the pumping device 220.
  • the outlet side 240 of the pumping device 220 is connected in parallel with the outlet backflow barrier 260 and the pressure compensation element 270, which are both connected to the environment 280.
  • the pumping device 220 may be a vane, piston, diaphragm or other pump for the medium to be evacuated.
  • the pump motor 250 may be located inside or outside the enclosure 210.
  • the outlet check valve 260 and the pressure compensation element 270 may be connected by means of suitable connections, for example hoses or pipes.
  • the enclosure 210 may be sealed with respect to the medium to be conveyed and dedicated connections between the outlet side 240 of the pumping device 220 and the outlet reflux barrier 260 and the pressure compensation element 270 may be dispensed with.
  • the outlet check valve 260 and the pressure compensation element 270 may be in corresponding recesses of a wall the enclosure 210 so that each element is directly connected to the environment 280.
  • Connection of the outlet check valve 260 and / or the pressure compensator 270 to the ambient 280 may also include a connector such as a hose or tube to provide a transition point to the environment 280 at, for example, an engine compartment of the environment Motor vehicle 1 10 of Figure 1 to lay.
  • a connection of the ambient 280 facing sides of the outlet check valve 260 and the pressure compensation element 270 may be connected to each other inside or outside the enclosure 210.
  • FIGS. 3A and 3B show an integrated valve 300 for use in the vacuum pump 150 from FIG. 2, which connects the functions of the outlet reflux barrier 260 and the pressure compensation element 270 with one another.
  • the valve 300 comprises a housing 310, a resilient element 320 (shown here by way of example as a spiral spring), a surround 330, a sealing surface 340 formed on the housing 310 and a membrane 350.
  • the membrane 350 is shown as an example for a pressure compensation element 270; in its place, a filter element 400 can be used ( Figure 4).
  • the housing 310 may be inserted into a corresponding recess in the enclosure 210 of FIG. 2 or may be designed to be integrated with the enclosure 210.
  • the housing 310 is connected with its side shown above with the environment 280 of Figure 2 and with its side shown below with the outlet side 240 of the pumping device 220.
  • the membrane 350 is supported by a skirt 330, which is driven by the spring 320 within the housing 310 against the sealing surface 340.
  • FIG. 3A shows the integrated valve 300 outside a pumping operation of the vacuum pump 150.
  • the spring 320 presses the skirt 330 against the sealing surface 340, so that air, indicated by the arrows on the top and bottom of the integrated valve 300, only in a relatively small Volume flow can flow through the membrane 350 as long as there is a pressure gradient from the top to the bottom.
  • the membrane 350 may be made of expanded polytetrafluoroethene, for example, and only gaseous media let pass, however liquid and solid substances hold back. Alternatively, the membrane may be passable from top to bottom only for air and retain all other flows.
  • the membrane 350 may, for example, have a diameter of about 20 mm.
  • FIG. 3B shows the integrated valve 300 during a pumping operation of the vacuum pump 150 from FIG. 2.
  • FIG. 4 shows a filter element 400 for use as a pressure compensation element
  • a filter medium 410 includes, for example, a nonwoven, a bed, porous solids, tissue and / or paper.
  • the filter medium 410 is delimited upwardly by an upper support element 420 and downwardly by a lower support element 430.
  • the support members 420 and 430 hold the filter medium 410 such that it is not deformed by a flow of the medium.
  • the support members 420 and 430 may be used to support the filter element 400 in a housing or other surrounding structure, such as enclosure 330 in FIG. 3, and configured so that media does not flow past the side of the filter media 410.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Compressor (AREA)

Abstract

L'invention concerne une pompe à vide, destinée notamment à être utilisée dans un véhicule automobile, comportant un côté entrée servant à aspirer une substance fluide et un côté sortie servant à distribuer la substance aspirée dans un milieu ambiant. Selon l'invention, cette pompe présente, au niveau de son côté sortie, un dispositif anti-retour de sortie qui empêche un reflux de la substance à partir du milieu ambiant, le côté sortie comportant un élément de compensation de pression servant à compenser une dépression dans la pompe à vide par rapport au milieu ambiant. Toujours selon l'invention, l'élément de compensation de pression est conçu pour empêcher la pénétration dans la pompe à vide de substances provenant du milieu ambiant et risquant de provoquer des détériorations.
EP10734095A 2009-08-24 2010-07-13 Pompe à vide à compensation de pression Withdrawn EP2470790A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910028831 DE102009028831A1 (de) 2009-08-24 2009-08-24 Unterdruckpumpe mit Druckausgleich
PCT/EP2010/060001 WO2011023448A1 (fr) 2009-08-24 2010-07-13 Pompe à vide à compensation de pression

Publications (1)

Publication Number Publication Date
EP2470790A1 true EP2470790A1 (fr) 2012-07-04

Family

ID=42751884

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10734095A Withdrawn EP2470790A1 (fr) 2009-08-24 2010-07-13 Pompe à vide à compensation de pression

Country Status (5)

Country Link
EP (1) EP2470790A1 (fr)
JP (1) JP5383917B2 (fr)
DE (1) DE102009028831A1 (fr)
IN (1) IN2012DN01495A (fr)
WO (1) WO2011023448A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013104375A1 (de) 2013-04-30 2014-10-30 Hella Kgaa Hueck & Co. Vakuumpumpe
DE102018203031A1 (de) 2018-03-01 2019-09-05 Robert Bosch Gmbh Drucksensor für einen Bremskraftverstärker
CN110654360B (zh) * 2018-06-28 2021-06-22 长城汽车股份有限公司 电子真空泵控制方法、装置、系统及机器可读存储介质
CN117203427A (zh) * 2021-04-27 2023-12-08 株式会社村田制作所 泵装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4412416A (en) * 1980-10-20 1983-11-01 General Motors Corporation Altitude compensated vacuum supply system and control
JPH08192737A (ja) * 1995-01-18 1996-07-30 Nabco Ltd 負圧供給装置
GB0326613D0 (en) * 2003-11-14 2003-12-17 Boc Group Plc Vacuum pump
GB2440542A (en) * 2006-07-31 2008-02-06 Boc Group Plc Vacuum pump gearbox purge gas arrangement
JP5350598B2 (ja) * 2007-03-28 2013-11-27 東京エレクトロン株式会社 排気ポンプ、連通管、排気システム及び基板処理装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011023448A1 *

Also Published As

Publication number Publication date
IN2012DN01495A (fr) 2015-06-05
JP2013502537A (ja) 2013-01-24
DE102009028831A1 (de) 2011-03-03
JP5383917B2 (ja) 2014-01-08
WO2011023448A1 (fr) 2011-03-03

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