WO2007003215A1 - Vacuum vane pump with discharge valve - Google Patents

Vacuum vane pump with discharge valve Download PDF

Info

Publication number
WO2007003215A1
WO2007003215A1 PCT/EP2005/007317 EP2005007317W WO2007003215A1 WO 2007003215 A1 WO2007003215 A1 WO 2007003215A1 EP 2005007317 W EP2005007317 W EP 2005007317W WO 2007003215 A1 WO2007003215 A1 WO 2007003215A1
Authority
WO
WIPO (PCT)
Prior art keywords
outlet opening
pump
passage
vacuum pump
valve means
Prior art date
Application number
PCT/EP2005/007317
Other languages
French (fr)
Inventor
Leonardo Cadeddu
Original Assignee
Vhit S.P.A.
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 S.P.A. filed Critical Vhit S.P.A.
Priority to PCT/EP2005/007317 priority Critical patent/WO2007003215A1/en
Publication of WO2007003215A1 publication Critical patent/WO2007003215A1/en

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
    • F04C18/3442—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 the surfaces of the inner and outer member, forming the inlet and outlet opening
    • 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
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; Monitoring

Definitions

  • the subject of the present invention is an improved vacuum pump, especially a single blade vacuum pump.
  • vacuum pumps the pumps intended to generate and maintain a depression in an air tank.
  • One of the most frequent applications of the vacuum pumps takes place in the motor vehicles, in order to render available a depression suitable for activating pneumatic servomotors for brake assistance or other apparatuses.
  • blade pumps which may be single blade pumps or plural blades pumps.
  • the single blade vacuum pumps need to have a low inertia outlet valve, in order to ensure a complete separation between the intake steps and the outlet steps, thus preventing any air return through the outlet opening.
  • usually such a valve is not needed for the plural blades pumps, wherein the separation among the different steps is operated by the blades themselves.
  • the valve needed for a single blade vacuum pump comprises a flexible lamellar shutter, movable between a first position in which the shut- ter is applied from outside against the outlet opening of the pump and a second position far away from the outlet opening of the pump.
  • the lamellar shutter In the first position the lamellar shutter prevents a fluid intake through the outlet aperture, whereas in the second position the lamellar shutter allows air and lubricating oil to come out through the outlet opening of the pump.
  • This second position is usually limited by a stop member.
  • the known single blade vacuum pumps have some disadvantages.
  • some depression lasts in the pump chamber, and then some oil is sucked inside the chamber through the lubrication channel and through the clearances existing between the rotor and the body of the pump, and the presence of the oil in the pump chamber gives rise to problems when subsequently the engine is started, or during a vehicle maneuver which generates an inverse rotation of the engine.
  • the mechanical torque strongly increases, and this can cause damages or breaks in the vacuum pump or in the mechanisms connected thereto.
  • this kind of pumps puts particular requirements about the position in which the pump should be installed on the engine, because it is suitable that the pump outlet is provided in the bottom part of the pump.
  • the main object of the present invention is to improve a vacuum pump, especially a single blade vacuum pump, in order to avoid or reduce the disadvantages of the known single blade vacuum pumps. More particularly, it is an object of the invention that of timely preventing the persistency of a de- pression in the pump chamber after the pump stop. Another object of the invention is that of ensuring a greater freedom in choosing the installation position of the pump. A further object of the invention is that of attaining the stated objects by using means very simple and inexpensive.
  • a vacuum pump comprising a pump chamber, a blade pumping mechanism, an outlet opening, and valve means suitable for allowing fluids to pass through said outlet opening in the exit sense and for preventing fluids to pass through said outlet opening in the entry sense, characterized in that, in addition, said outlet opening comprises a permanent communication with the outside, through a passage having a little section and being permanently open.
  • the outlet valve may be situated in a posi- tion not at bottom, or it may also be situated in an area wherein oil sacks could arise, although it is always recommended that the region in which the oil is discharged from the pump is sufficiently drained.
  • said passage having a little section and being permanently open consists in a little hole formed in said valve means, which are embodied in the form of a lamellar shutter movable between a closure position and a passage position.
  • said valve means which are embodied in the form of a lamellar shutter movable between a closure position and a passage position.
  • the characteristic of the invention may also be realized by different constructional solutions, as for example by various kinds of openings or vents provided in the valve means controlling the outlet opening of the pump, or even by grooves or vents provided in the seatings of said valve means.
  • Figures 1 and 2 illustrate in two orthogonal cross sections a single blade vacuum pump, in order to recall its structure and operation.
  • Figure 3 shows the cross section of a single blade vacuum pump improved according to the present invention, in its more simple embodiment.
  • number 1 designates the pump body, wherein is delimited the pump chamber 2-3.
  • the pump chamber is subdivided in a suction chamber 2 and a compression chamber 3, by the presence of a single blade 4 intended to rotate in a counterclock sense, according to this example, and driven by a rotor 5.
  • the end portions of blade 4 slide contacting the inner wall of body 1 , and the sealing is ensured by an oil film introduced through a passage 6.
  • the pump sucks air through an inlet connection 7 put in communication with the tank in which a depression is to be created and maintained, and the pump ejects the air and the excess lubricating oil through an outlet opening 8.
  • the outlet opening 8 is equipped with a lamellar shutter 9, which is represented in the position in which it is applied from outside against the outlet opening 8 in order to prevent intake of fluids.
  • a lamellar shutter 9 displaces away from the outlet opening 8 for allowing fluids to exit, it comes to rest against a stop member 11 , which limits the displacement freedom of the shutter.
  • a little hole 10 is formed in the lamellar shutter 9.
  • the cross section of hole 10 is very little with respect to the cross section of the outlet opening 8, and therefore its presence cannot affect in a noticeable manner the operation of the pump and its per- formances.
  • the hole 10 allows some air to enter from the outside. Although very limited, this air entrance quickly compensates for the depression still remained in the pump chamber, and therefore it prevents the disadvantages which could be caused later on by said depression.
  • the hole 10 formed in the lamellar shutter 9 embodies the more simple and inexpensive means for the realization of a little section passageway permanently open, which communicates the pump chamber with the outside.
  • any kind of opening or vent may be provided in the lamellar shutter 9 which controls the outlet opening 8 of the pump, or in the seat of the outlet opening 8, against which the lamellar shutter 9 comes to rest.

Landscapes

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

Abstract

A vacuum pump comprising a pump chamber (2-3), a blade pumping mechanism (4-5), especially a single blade (4) pumping mechanism, an outlet opening (8), and valve means (9) suitable for allowing fluids to pass through the outlet opening (8) in the exit sense and not in the entry sense, wherein the outlet opening (8) comprises a permanent communication with the outside, through a passage (10) having a little section and being permanently open. Advantageously, the passage (10) may consist in a little hole (10) formed in the valve means (9), which are embodied in the form of a lamellar shutter (9) movable between a closure position and a passage position. Otherwise the passage (10) may comprise conformations of openings -or vents formed in the valve means (9) controlling the outlet opening (8) of the pump, or may comprise grooves or vents formed in the seat of the outlet opening (8) of the pump against which come to rest the valve means (9).

Description

DESCRIPTION
VACUUM VANE PUMP WITH DISCHARGE VALVE
The subject of the present invention is an improved vacuum pump, especially a single blade vacuum pump. In the technique are generally called "vacuum pumps" the pumps intended to generate and maintain a depression in an air tank. One of the most frequent applications of the vacuum pumps takes place in the motor vehicles, in order to render available a depression suitable for activating pneumatic servomotors for brake assistance or other apparatuses. To this aim, use is gen- erally made of blade pumps, which may be single blade pumps or plural blades pumps.
It is known that, for a correct operation, the single blade vacuum pumps need to have a low inertia outlet valve, in order to ensure a complete separation between the intake steps and the outlet steps, thus preventing any air return through the outlet opening. On the contrary, usually such a valve is not needed for the plural blades pumps, wherein the separation among the different steps is operated by the blades themselves.
Usually, the valve needed for a single blade vacuum pump comprises a flexible lamellar shutter, movable between a first position in which the shut- ter is applied from outside against the outlet opening of the pump and a second position far away from the outlet opening of the pump. In the first position the lamellar shutter prevents a fluid intake through the outlet aperture, whereas in the second position the lamellar shutter allows air and lubricating oil to come out through the outlet opening of the pump. This second position is usually limited by a stop member.
However, the known single blade vacuum pumps have some disadvantages. When the vacuum pump is stopped, some depression lasts in the pump chamber, and then some oil is sucked inside the chamber through the lubrication channel and through the clearances existing between the rotor and the body of the pump, and the presence of the oil in the pump chamber gives rise to problems when subsequently the engine is started, or during a vehicle maneuver which generates an inverse rotation of the engine. In effect, in such conditions the mechanical torque strongly increases, and this can cause damages or breaks in the vacuum pump or in the mechanisms connected thereto. Moreover, this kind of pumps puts particular requirements about the position in which the pump should be installed on the engine, because it is suitable that the pump outlet is provided in the bottom part of the pump. Although these disadvantages are characteristic of the single blade vacuum pumps, sometimes they may be present even in plural blades vacuum pumps wherein, in view of a particular installation necessity, are present conditions in which some liquid may penetrate in the pump when this latter is stopped.
The main object of the present invention is to improve a vacuum pump, especially a single blade vacuum pump, in order to avoid or reduce the disadvantages of the known single blade vacuum pumps. More particularly, it is an object of the invention that of timely preventing the persistency of a de- pression in the pump chamber after the pump stop. Another object of the invention is that of ensuring a greater freedom in choosing the installation position of the pump. A further object of the invention is that of attaining the stated objects by using means very simple and inexpensive.
According to the invention, these objects are attained by a vacuum pump comprising a pump chamber, a blade pumping mechanism, an outlet opening, and valve means suitable for allowing fluids to pass through said outlet opening in the exit sense and for preventing fluids to pass through said outlet opening in the entry sense, characterized in that, in addition, said outlet opening comprises a permanent communication with the outside, through a passage having a little section and being permanently open.
In this way, in view of the little section of said passage, the presence of the same does not involve any noticeable reduction in the performances of the pump, when this latter is operating, but such a little passage is sufficient for causing a quick cancellation of the depression existing inside the pump chamber, when the pump is stopped. In this way, the stated disadvantages are prevented, and more particularly it is avoided that at the pump stop some lubricating oil is sucked inside the pump chamber, thus generating the subsequent problems. It is also possible to install the vacuum pump on the engine in a unfavorable position, namely, the outlet valve may be situated in a posi- tion not at bottom, or it may also be situated in an area wherein oil sacks could arise, although it is always recommended that the region in which the oil is discharged from the pump is sufficiently drained.
According to a preferred feature of the invention, said passage having a little section and being permanently open consists in a little hole formed in said valve means, which are embodied in the form of a lamellar shutter movable between a closure position and a passage position. In this way the invention may be realized in the more simple and inexpensive way.
However, the characteristic of the invention may also be realized by different constructional solutions, as for example by various kinds of openings or vents provided in the valve means controlling the outlet opening of the pump, or even by grooves or vents provided in the seatings of said valve means.
These and other features, objects and advantages of the subject of the present invention will more clearly appear from the following description of a preferred embodiment, being however a not limiting example, the description being drawn with reference to the accompanying drawing.
Figures 1 and 2 illustrate in two orthogonal cross sections a single blade vacuum pump, in order to recall its structure and operation. Figure 3 shows the cross section of a single blade vacuum pump improved according to the present invention, in its more simple embodiment.
With reference to Figures 1 and 2, number 1 designates the pump body, wherein is delimited the pump chamber 2-3. The pump chamber is subdivided in a suction chamber 2 and a compression chamber 3, by the presence of a single blade 4 intended to rotate in a counterclock sense, according to this example, and driven by a rotor 5. The end portions of blade 4 slide contacting the inner wall of body 1 , and the sealing is ensured by an oil film introduced through a passage 6. The pump sucks air through an inlet connection 7 put in communication with the tank in which a depression is to be created and maintained, and the pump ejects the air and the excess lubricating oil through an outlet opening 8.
As it may be observed in Figure 3, the outlet opening 8 is equipped with a lamellar shutter 9, which is represented in the position in which it is applied from outside against the outlet opening 8 in order to prevent intake of fluids. When the lamellar shutter 8 displaces away from the outlet opening 8 for allowing fluids to exit, it comes to rest against a stop member 11 , which limits the displacement freedom of the shutter.
According to the invention, in order to put the outlet opening 8 in per- manent communication with the outside through a passage having a little section and permanently open, a little hole 10 is formed in the lamellar shutter 9.
As it may be observed, the cross section of hole 10 is very little with respect to the cross section of the outlet opening 8, and therefore its presence cannot affect in a noticeable manner the operation of the pump and its per- formances. On the other hand, when the pump is stopped, the hole 10 allows some air to enter from the outside. Although very limited, this air entrance quickly compensates for the depression still remained in the pump chamber, and therefore it prevents the disadvantages which could be caused later on by said depression. As already said, the hole 10 formed in the lamellar shutter 9 embodies the more simple and inexpensive means for the realization of a little section passageway permanently open, which communicates the pump chamber with the outside. However, of course, other constructive solutions are possible. For example, any kind of opening or vent may be provided in the lamellar shutter 9 which controls the outlet opening 8 of the pump, or in the seat of the outlet opening 8, against which the lamellar shutter 9 comes to rest.
In the above, reference has been made to the case of a single blade vacuum pump, which is foreseen as the main application of the invention. However it is to be understood that the characteristics of the invention may also be applied to plural blades vacuum pumps in those cases in which, in view of a particular installation necessity, are present conditions in which some liquid may penetrate in the pump when this latter is stopped.
This invention is not limited to the exemplary embodiment described and represented. Several possible modifications have been described, and various others are within the capacity of those skilled in the art.
The cited changes and others, and any replacement by technically equivalent means, may be introduced in what has been described and illustrated, without departing from the spirit of the invention and the scope of this Patent, as defined by the appended Claims.

Claims

CLAIMSAN IMPROVED VACUUM PUMP
1 . A vacuum pump comprising a pump chamber (2-3), a blade pumping mechanism (4-5), an outlet opening (8), and valve means (9) suitable for allowing fluids to pass through said outlet opening (8) in the exit sense and for preventing fluids to pass through said outlet opening (8) in the entry sense, characterized in that, in addition, said outlet opening (8) comprises a permanent communication with the outside, through a passage (10) having a little section and being permanently open.
2 . A vacuum pump according to Claim 1 , characterized in that it is a single blade (4) vacuum pump or a plural blades vacuum pump in which are present conditions in which some liquid may penetrate in the pump when this latter is stopped.
3 . A vacuum pump according to Claim 1 , characterized in that said passage (10) having a little section and being permanently open consists in a little hole (10) formed in said valve means (9), which are embodied in the form of a lamellar shutter (9) movable between a closure position and a passage position.
4 . A vacuum pump according to Claim 1 , characterized in that said passage (10) having a little section and being permanently open comprises conformations of openings or vents formed in said valve means (9) controlling the outlet opening (8) of the pump.
5 . A vacuum pump according to Claim 1 , characterized in that said passage (10) having a little section and being permanently open comprises grooves or vents formed in the seat of the outlet opening (8) of the pump against which come to rest said valve means (9).
PCT/EP2005/007317 2005-07-05 2005-07-05 Vacuum vane pump with discharge valve WO2007003215A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2005/007317 WO2007003215A1 (en) 2005-07-05 2005-07-05 Vacuum vane pump with discharge valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2005/007317 WO2007003215A1 (en) 2005-07-05 2005-07-05 Vacuum vane pump with discharge valve

Publications (1)

Publication Number Publication Date
WO2007003215A1 true WO2007003215A1 (en) 2007-01-11

Family

ID=35744709

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/007317 WO2007003215A1 (en) 2005-07-05 2005-07-05 Vacuum vane pump with discharge valve

Country Status (1)

Country Link
WO (1) WO2007003215A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1953389A2 (en) 2007-01-29 2008-08-06 Pierburg GmbH Vacuum pump
DE102010044898A1 (en) * 2010-09-09 2012-03-15 Schwäbische Hüttenwerke Automotive GmbH Vacuum pump with ventilation device
DE202012002882U1 (en) * 2012-03-22 2013-06-25 Oerlikon Leybold Vacuum Gmbh Rotary vacuum pump
DE202012002883U1 (en) * 2012-03-22 2013-06-25 Oerlikon Leybold Vacuum Gmbh Rotary vacuum pump
DE202012002881U1 (en) * 2012-03-22 2013-06-25 Oerlikon Leybold Vacuum Gmbh Rotary vacuum pump
DE102012222753A1 (en) 2012-12-11 2014-06-12 Schwäbische Hüttenwerke Automotive GmbH Gas pump with sealing oil groove
WO2014102650A1 (en) 2012-12-27 2014-07-03 Vhit S.P.A. Lubrication system for a rotary vacuum pump
CN104005955A (en) * 2013-02-27 2014-08-27 福特环球技术公司 Vacuum pump with rotor-stator positioning to provide non-return
CN104131979A (en) * 2013-04-30 2014-11-05 黑拉许克联合股份有限公司 Vacuum pump
AU2019204608B2 (en) * 2014-06-27 2021-07-22 Ateliers Busch Sa Method of pumping in a system of vacuum pumps and system of vacuum pumps

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3326456A (en) * 1965-09-13 1967-06-20 Prec Scient Company Check valve for a vacuum pump
JPS58172482A (en) * 1982-04-05 1983-10-11 Hitachi Ltd Scroll compressor
EP0515929A1 (en) * 1991-05-29 1992-12-02 LuK Automobiltechnik GmbH & Co. KG Vane vacuum pump
JP2002349458A (en) * 2001-05-22 2002-12-04 Matsushita Electric Ind Co Ltd Hermetically closed type scroll compressor
DE10227772A1 (en) * 2001-06-27 2003-01-09 Luk Automobiltech Gmbh & Co Kg Method for reducing sound level of vacuum pump has a controlled bleed to provide an air ballast to slow the action of the non return valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3326456A (en) * 1965-09-13 1967-06-20 Prec Scient Company Check valve for a vacuum pump
JPS58172482A (en) * 1982-04-05 1983-10-11 Hitachi Ltd Scroll compressor
EP0515929A1 (en) * 1991-05-29 1992-12-02 LuK Automobiltechnik GmbH & Co. KG Vane vacuum pump
JP2002349458A (en) * 2001-05-22 2002-12-04 Matsushita Electric Ind Co Ltd Hermetically closed type scroll compressor
DE10227772A1 (en) * 2001-06-27 2003-01-09 Luk Automobiltech Gmbh & Co Kg Method for reducing sound level of vacuum pump has a controlled bleed to provide an air ballast to slow the action of the non return valve

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 009 (M - 268) 14 January 1984 (1984-01-14) *
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 04 2 April 2003 (2003-04-02) *

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1953389A2 (en) 2007-01-29 2008-08-06 Pierburg GmbH Vacuum pump
EP1953389A3 (en) * 2007-01-29 2011-11-02 Pierburg GmbH Vacuum pump
DE102007005216B4 (en) * 2007-01-29 2015-07-30 Pierburg Gmbh vacuum pump
DE102010044898A1 (en) * 2010-09-09 2012-03-15 Schwäbische Hüttenwerke Automotive GmbH Vacuum pump with ventilation device
CN102410223A (en) * 2010-09-09 2012-04-11 斯瓦本冶炼厂汽车股份有限公司 Vacuum pump with ventilating means
DE202012002883U1 (en) * 2012-03-22 2013-06-25 Oerlikon Leybold Vacuum Gmbh Rotary vacuum pump
CN104204533A (en) * 2012-03-22 2014-12-10 厄利孔莱博尔德真空技术有限责任公司 Vacuum-type rotary slide pump
WO2013139570A3 (en) * 2012-03-22 2014-07-03 Oerlikon Leybold Vacuum Gmbh Vacuum-type rotary slide pump
DE202012002881U1 (en) * 2012-03-22 2013-06-25 Oerlikon Leybold Vacuum Gmbh Rotary vacuum pump
CN104204533B (en) * 2012-03-22 2017-03-08 莱宝有限责任公司 Rotary-vane vaccum pump
DE202012002882U1 (en) * 2012-03-22 2013-06-25 Oerlikon Leybold Vacuum Gmbh Rotary vacuum pump
DE102012222753A1 (en) 2012-12-11 2014-06-12 Schwäbische Hüttenwerke Automotive GmbH Gas pump with sealing oil groove
DE102012222753B4 (en) * 2012-12-11 2016-08-04 Schwäbische Hüttenwerke Automotive GmbH Gas pump with sealing oil groove
WO2014102650A1 (en) 2012-12-27 2014-07-03 Vhit S.P.A. Lubrication system for a rotary vacuum pump
CN104919182A (en) * 2012-12-27 2015-09-16 Vhit公司 Lubrication system for a rotary vacuum pump
US9086066B2 (en) 2013-02-27 2015-07-21 Ford Global Technologies, Llc Vacuum pump with rotor-stator positioning to provide non-return
DE102014203365A1 (en) 2013-02-27 2014-08-28 Ford Global Technologies, Llc VACUUM PUMP WITH ROTOR STATOR POSITIONING TO GUARANTEE A REVERSING LOCK
CN104005955A (en) * 2013-02-27 2014-08-27 福特环球技术公司 Vacuum pump with rotor-stator positioning to provide non-return
CN104005955B (en) * 2013-02-27 2019-01-01 福特环球技术公司 Vacuum pump with the rotor stator for being positioned to provide check function
CN104131979A (en) * 2013-04-30 2014-11-05 黑拉许克联合股份有限公司 Vacuum pump
AU2019204608B2 (en) * 2014-06-27 2021-07-22 Ateliers Busch Sa Method of pumping in a system of vacuum pumps and system of vacuum pumps

Similar Documents

Publication Publication Date Title
WO2007003215A1 (en) Vacuum vane pump with discharge valve
US10011254B2 (en) Pulsation damping device of hydraulic brake system
JP4165608B1 (en) Vane type vacuum pump
KR100915713B1 (en) One way valve of variable capacity compressor for vehicle
WO2006087903A1 (en) Vane pump
JP2011058499A (en) Motor-pump unit
KR100827272B1 (en) A pump for electronic control brake system
WO2011135747A1 (en) Vane pump
EP0623749A1 (en) Rotary gas compressor
JP2000205159A (en) Vane type vacuum pump
KR101021532B1 (en) Pump for brake system
JP2022533946A (en) Spool valve used in variable vane pump
JP2015068181A (en) Electric pump
CN104005955B (en) Vacuum pump with the rotor stator for being positioned to provide check function
CN109154294B (en) Dry-running vane air pump
JP5036708B2 (en) Automotive motor vacuum pump and one-way valve used in the vacuum pump
KR20070062741A (en) Electronic control brake system
KR101402715B1 (en) Hydraulic pump for electronic control brake system
JP2001165081A (en) Compressor and refrigerating or cooling device having refrigerating cycle with the compressor
JP3753199B2 (en) Axial piston pump
CN111720581B (en) Vacuum pump exhaust reed valve with pressure relief
KR102529520B1 (en) Vacuum Pump for Vehicle
EP4174316A1 (en) Vacuum pump provided with a gas ballast arrangement
KR100611338B1 (en) Pump for anti-lock brake system
KR101021515B1 (en) Pump for brake system

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

WWW Wipo information: withdrawn in national office

Country of ref document: DE

122 Ep: pct application non-entry in european phase

Ref document number: 05762587

Country of ref document: EP

Kind code of ref document: A1