EP4182561A1 - Pompe à vide de véhicule automobile - Google Patents

Pompe à vide de véhicule automobile

Info

Publication number
EP4182561A1
EP4182561A1 EP20742218.9A EP20742218A EP4182561A1 EP 4182561 A1 EP4182561 A1 EP 4182561A1 EP 20742218 A EP20742218 A EP 20742218A EP 4182561 A1 EP4182561 A1 EP 4182561A1
Authority
EP
European Patent Office
Prior art keywords
housing
pump
section
motor vehicle
discharge
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.)
Pending
Application number
EP20742218.9A
Other languages
German (de)
English (en)
Inventor
Steffen Schnurr
Nabil Salim AL-HASAN
Stanislaus Russ
Tobias GRÜNE
Petra Hagen
Marcel PIOTROWSKI
Sebastian Irmer
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 EP4182561A1 publication Critical patent/EP4182561A1/fr
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • 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
    • 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

  • the present invention is directed to a motor vehic!e vacuum pump, in particular to an electric rotary vane vacuum pump for providing vacuum to a motor vehicle brake booster.
  • Motor vehicle vacuum pumps are typically used in motor vehicles for providing vacuum to a brake booster of a motor vehicle braking system, in particular for providing vacuum to a vacuum chamber of the brake booster.
  • the motor vehicle vacuum pump can be the only vacuum source for the brake booster, or can be used in combination with other vacuum sources as for example an intake system of an internal combustion engine.
  • the brake booster utilizes the pressure difference between its vacuum chamber pressure and the surrounding atmospheric pressure to enhance a mechanic brake force which is generated by pressing the brake pedal of the motor vehicle and which mechanically actuates the motor vehicle braking system.
  • Providing the brake booster vacuum chamber with an adequate vacuum is therefore crucial to ensure a reliable operation of the brake booster and, as a result, to ensure a reliable and convenient operation of the motor vehicle braking system.
  • WO 2019/034256 A1 discloses, for example, a motor vehicle vacuum pump with a pumping unit with a rotatable pump rotor, wherein the pump rotor is configured to pump fluid from a suction side to a discharge side of the pumping unit during pump operation.
  • the motor vehicle vacuum pump also comprises a pump housing with a housing discharge opening, wherein the housing discharge opening is fluidically connected with the discharge side of the pumping unit. If the motor vehicle vacuum pump is switched off after pump operation, ambient air is sucked into the pump housing via the housing discharge opening because of the pressure difference between the at least partially evacuated pump housing and the ambient atmosphere.
  • the disclosed motor vehicle vacuum pump is provided with a special discharge channel with an abrupt cross section expansion toward the discharge opening to reduce the inflow velocity of the ambient air at the discharge opening during the pump venting and thus to reduce humidity and particle entry into the pump housing. This provides a relatively durable motor vehicle vacuum pump.
  • the motor vehicle vacuum pump of WO 2019/034256 A1 has to be installed in the motor vehicle in a defined orientation in which the discharge opening is oriented downwardly to prevent liquid, e.g. condensation water, from accumulating in the discharge channel.
  • This prescribed installation orientation significantly restricts the installation possibilities and thus the application possibilities of the disclosed motor vehicle vacuum pump.
  • An object of the present invention is therefore to provide a durable and versatile motor vehicle vacuum pump.
  • the motor vehicle vacuum pump is provided with a pumping unit with a rotatable pump rotor.
  • the pump rotor is arranged in a pumping chamber and is configured to pump fluid from a suction side of the pumping unit to a discharge side of the pumping unit if the pump rotor is driven during pump operation.
  • the pumping chamber is preferably substantially cylindrical and the pump rotor preferably comprises a rotor body which is eccentrically arranged in the pumping chamber and which comprises several radially slidable rotor vanes.
  • the rotor vanes are in touching radial contact with a pumping chamber sidewall and define several rotating, fluidically separated pumping-chamber compartments which convey fluid from the suction side of the pumping unit to the discharge side of the pumping unit.
  • the pumping unit is configured in that way that the volume of a pumping compartment varies during its movement from the suction side to the discharge side so that the conveyed fluid is compressed.
  • the motor vehicle vacuum pump is also provided with a pump housing which comprises a housing discharge opening.
  • the pump housing is typically composed of a plurality of housing parts which define a plurality of housing chambers.
  • the pump housing typically defines at least the pumping chamber and a motor chamber.
  • the housing discharge opening is fluidically connected with the discharge side of the pumping unit so that fluid is discharged to the ambient atmosphere via the housing discharge opening during pump operation.
  • the housing discharge opening can be a simple opening within a housing sidewall or can be defined by a housing discharge tube/nozzle which protrudes from the housing sidewall.
  • the housing discharge opening is typically provided with a substantially circular opening cross-section.
  • the motor vehicle vacuum pump comprises a separate deflection element which is attached to the pump housing.
  • the deflection element defines a deflection channel which is fluidically connected with the housing discharge opening so that fluid is discharged via the deflection channel to the ambient atmosphere during pump operation.
  • the deflection channel preferably discharges directly into the ambient atmosphere so that the deflection channel defines the final section of the discharge flow path.
  • the deflection channel is configured to deflect the fluid flow which is discharged out of the housing discharge opening during pump operation, i.e. the deflection channel is designed in that way that the flow direction of the fluid is changed during the passage of the fluid through the deflection channel.
  • the discharge channel can, for example, be designed curved or angled.
  • the discharge channel can also be designed straight but inclined with respect to the discharge direction of the housing discharge opening. In any case, the deflection channel is designed in that way that the flow direction of the fluid which flows through the discharge channel is deflected with respect to the flow direction of the fluid at the housing discharge opening.
  • the separate deflection element according to the invention can be easily adapted for different installation orientations of the motor vehicle vacuum pump.
  • the deflection element can in particular be easily designed in that way that the ambient-atmosphere-sided end of the deflection channel is oriented downwardly if the motor vehicle vacuum pump is installed.
  • the downward-oriented deflection channel allows liquid, e.g. condensation water, to drain out of the deflection channel and also minimizes humidity and particle entry into the pump housing during the pump venting.
  • the separate deflection element allows the motor vehicle vacuum pump to be easily adapted to different installation orientations and thus to different installation sites without requiring a redesign of the (complete) pump housing.
  • the separate deflection element according to the present invention thus provides a durable and versatile motor vehicle vacuum pump.
  • the deflection element and/or the pump housing are designed in that way that the deflection element is attachable to the pump housing with different orientations with respect to the pump housing. This allows to realize different spatial orientations of the deflection element and, in particular, of the ambient- atmosphere-sided end of the deflection channel with the same deflection element. This allows the motor vehicle vacuum pump to be adapted to different installation sites by simply attaching the deflection element to the pump housing with a different spatial orientation and thus provides a versatile motor vehicle vacuum pump.
  • the deflection element is provided with a fastening receptacle and the pump housing is provided with a protruding housing discharge tube which defines the housing discharge opening and which is inserted into the fastening receptacle so as to fasten the deflection element at the pump housing.
  • the fastening receptacle and/or the housing discharge tube are designed in that way that the deflection element is attachable to the pump housing with different spatial orientations.
  • the fastening receptacle is provided with a substantially cylindrical opening and the housing discharge tube is provided with a corresponding, substantially cylindrical outside surface so that the deflection element can be attached with different rotational orientations with respect to the housing discharge tube.
  • the inside surface of the fastening receptacle and the outside surface of the housing discharge tube are designed to provide a force fit or a form fit in the circumferential direction so as to prevent an unintentional rotation of the deflection element on the housing discharge tube. This provides a versatile motor vehicle vacuum pump.
  • a housing-discharge- opening-remote outlet channel section of the deflection channel is provided angled with respect to a housing-discharge-opening-adjoining inlet channel section of the deflection channel, preferably the outlet channel section is provided substantially perpendicular to the inlet channel section.
  • the inlet channel section is typically provided center justified with the housing discharge opening.
  • the angled deflection allows the spatial orientation of the ambient-atmosphere-sided end of the deflection channel and thus the discharge direction of the deflection element to be simply varied by rotating the deflection element around the axis of extension of the inlet channel section and thus by rotating the deflection element around the center of the discharge opening. This allows the motor vehicle vacuum pump to be easily adapted to different installation sites by rotating the deflection element and thus provides a versatile motor vehicle vacuum pump.
  • the housing-discharge-opening-adjoining inlet channel section of the deflection channel is provided with a smaller flow cross-section area compared to a flow cross-section area of the housing-discharge-opening- remote outlet channel section of the deflection channel.
  • the larger flow cross-section area of the outlet channel section reduces the flow velocity at the ambient-atmosphere-sided outlet opening of the deflection channel with respect to the flow velocity at the housing-discharge-opening-sided inlet opening of the deflection channel. This reduces the ambient air inflow velocity at the deflection channel outlet opening during the venting of the vacuum pump and thus significantly reduces the humidity and particle entry into the pump housing.
  • the deflection channel comprises an intermediate channel section which fluidically connects the outlet channel section with the inlet channel section, wherein the intermediate channel section is provided with a flow cross-section area which is smaller than the flow cross-section area of the outlet channel section, preferably smaller than or equal to the flow cross-section area of the inlet channel section.
  • the deflection element is made of an elastic plastic, preferably made of rubber. The elastic deflection element allows a simple press-fitting attachment of the deflection element to the pump housing. This provides a reliable attachment of the deflection element without requiring any additional fixation means.
  • figure 1 shows a motor vehicle vacuum pump according to the present invention, wherein a deflection element is arranged in a first orientation
  • figure 2 shows an enlarged view of a pump section of the motor vehicle vacuum pump of figure 1
  • figure 3 shows the motor vehicle vacuum pump of figure 1, wherein the deflection element is arranged in an inverted second orientation.
  • Fig. 1 shows a motor vehicle vacuum pump 10 which is used in a motor vehicle braking system for providing a vacuum to a vacuum chamber of a motor vehicle brake booster 12.
  • the motor vehicle vacuum pump 10 comprises a substantially cylindrical pump housing 14 with a pot-shaped housing main body 16 and a housing cover element 18 which is attached to the housing main body 16.
  • the pump housing 14 is provided with a housing discharge tube 20 which radially protrudes from a housing sidewall 22 of the housing main body 16.
  • the housing discharge tube 20 is provided cylindrical and integral with the housing sidewall 22.
  • the housing discharge tube 20 defines a circular housing discharge opening 24 at its housing-sidewall-remote end.
  • the motor vehicle vacuum pump 10 comprises a pumping unit 26 which is arranged in the pump housing 14.
  • the pumping unit 26 comprises a rotatable pump rotor 28 which is configured to pump fluid, in particular gas, from a suction side 30 of the pumping unit 26 to a discharge side 32 of the pumping unit 26 during pump operation.
  • the motor vehicle vacuum pump 10 is a rotary vane pump wherein the pump rotor 28 comprises a plurality of rotor vanes which are configured to be radially slidable and to rotate within a substantially cylindrical pumping chamber.
  • the suction side 30 of the pumping unit 26 is fluidically connected to the motor vehicle brake booster 12, in particular to the vacuum chamber of the motor vehicle brake booster 12, via a check valve 34.
  • the check valve 34 allows a fluid flow from the motor vehicle brake booster 12 toward the pumping unit 26 during pump operation and prevents a backward fluid flow from the pumping unit 26 toward the motor vehicle brake booster 12 if the motor vehicle vacuum pump 10 is switched off.
  • the discharge side 32 of the pumping unit 26 is fluidically connected with the housing discharge opening 24 of the housing discharge tube 20 via a housing-internal discharge channel 36.
  • the motor vehicle vacuum pump 10 also comprises an electric motor 38 which is arranged in the pump housing 14.
  • the electric motor 38 is configured to drive the pump rotor 28 via a rotor shaft 40 which is co- rotatably connected with the pump rotor 28.
  • the electric motor 38 is electronically commutated and is configure to be operated with a variable rotational motor speed.
  • the motor vehicle vacuum pump 10 also comprises a pump control unit 42 which is configured to control the electric motor 38.
  • the pump control unit 42 is configured to provide a closed- loop control of the variable rotational motor speed of the electric motor 38.
  • the motor vehicle vacuum pump 10 also comprises a separate, substantially L-shaped deflection element 44 which is attached to the pump housing 14.
  • the deflection element 44 is made of rubber and is provided with a substantially cylindrical fastening receptacle 46.
  • the deflection element 44 is fastened at the pump housing 14 by a press-fit-connection formed by pressing the housing discharge tube 20 of the pump housing 14 into the fastening receptacle 46 of the deflection element 44.
  • Fig. 2 shows an enlarged view of a pump section which comprises the housing discharge tube 20 and the deflection element 44.
  • the deflection element 44 defines an angled, in particular a rectangular, deflection channel 48.
  • the deflection channel 48 is fluidically connected with the housing discharge opening 24 and thus with the discharge side 32 of the pumping unit 26.
  • the angled deflection channel 48 provides a deflection of the fluid flow which is discharged out of the housing discharge opening 24 during operation of the pumping unit 26.
  • the deflection channel 48 in particular comprises three adjoining channel sections, a housing-discharge-opening-adjoining inlet channel section 50, a housing-discharge-opening-remote outlet channel section 52, and an intermediate channel section 54 which fluidically connects the outlet channel section 52 with the inlet channel section 50.
  • the inlet channel section 50 is provided coaxially to the housing discharge tube 20 and (center-)aligned with the housing discharge opening 24 so that the housing discharge opening 24 fluidically leads into the inlet channel section 50.
  • the inlet channel section 50 is provided with an inlet section flow cross-section area A1 which is substantially equal to a discharge opening flow cross-section area A2 of the housing discharge opening 24.
  • the intermediate channel section 54 is provided perpendicular to the inlet channel section 50.
  • the intermediate channel section 54 is provided with an intermediate section flow cross-section area A3 which is smaller than the inlet section flow cross-section area A1 of the inlet channel section 50.
  • the outlet channel section 52 is provided coaxially to the intermediate channel section 54 and thus perpendicular to the inlet channel section 50.
  • the outlet channel section 52 is provided with an outlet section flow cross- section area A4 which is larger than the inlet section flow cross-section area A1 of the inlet channel section 50 and thus larger than the intermediate section flow cross-section area A3 of the intermediate channel section 54.
  • the outlet section flow cross-section area A4 is at least twice the intermediate section flow cross-section area A3, more preferably at least four times the intermediate section flow cross- section area A3.
  • the cylindrical fastening receptacle 46 allows the deflection element 44 to be mounted on the cylindrical housing discharge tube 20 with different rotational orientations with respect to the center axis of the housing discharge tube 20.
  • the separate deflection element 44 thus can easily be attached to the pump housing 14 with different orientations to thereby vary the discharge direction of the deflection channel 48 with respect to the pump housing 14.
  • the deflection element 44 is arranged in a first orientation, wherein the outlet channel section 52 is located at a housing-cover- element-sided side of the housing discharge tube 20 so that the deflection channel 48 deflects the discharge flow toward a housing-cover-element- sided side of the motor vehicle vacuum pump 10.
  • FIG 3 shows a possible second orientation of the deflection element 44, wherein the deflection element 44 is rotated by 180° around the center axis of the housing discharge tube 20 compared to the first orientation.
  • the outlet channel section 52 here is located at a housing-cover-element- remote side of the housing discharge tube 20 so that the deflection channel 48 deflects the discharge flow away from the housing-cover-element-sided side of the motor vehicle vacuum pump 10 and thus in the inverse axial direction compared to the first orientation.
  • deflection element 44 can be attached to the pump housing 14 also with any rotational orientation between the first orientation shown in Fig. 1 and the second orientation shown in Fig. 3.

Landscapes

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

Abstract

La présente invention est relative à une pompe à vide (10) de véhicule automobile comprenant - une unité de pompage (26) présentant un rotor de pompe (28) rotatif, le rotor de pompe (28) étant conçu pour pomper un fluide à partir d'un côté d'aspiration (30) vers un côté d'évacuation (32) de l'unité de pompage (26) pendant le fonctionnement de la pompe, - un carter de pompe (14) présentant une ouverture d'évacuation (24) de carter, l'ouverture d'évacuation (24) de carter étant en communication fluidique avec le côté d'évacuation (32) de l'unité de pompage (26), et - un élément de déviation séparé (44) qui est fixé au carter de pompe (14) et qui définit un canal de déviation (48), le canal de déviation (48) étant en communication fluidique avec l'ouverture d'évacuation (24) de carter et étant conçu pour dévier l'écoulement de fluide qui est évacué hors de l'ouverture d'évacuation (24) de carter. L'élément de déviation séparé (44) permet d'adapter facilement l'orientation spatiale d'une ouverture d'évacuation côté atmosphère à différentes orientations d'installation de telle sorte que l'accumulation de liquide dans le trajet d'écoulement d'évacuation est empêchée de manière fiable. L'invention concerne une pompe à vide (10) de véhicule automobile résistante et polyvalente.
EP20742218.9A 2020-07-14 2020-07-14 Pompe à vide de véhicule automobile Pending EP4182561A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2020/069913 WO2022012745A1 (fr) 2020-07-14 2020-07-14 Pompe à vide de véhicule automobile

Publications (1)

Publication Number Publication Date
EP4182561A1 true EP4182561A1 (fr) 2023-05-24

Family

ID=71661848

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20742218.9A Pending EP4182561A1 (fr) 2020-07-14 2020-07-14 Pompe à vide de véhicule automobile

Country Status (3)

Country Link
EP (1) EP4182561A1 (fr)
CN (1) CN115803528A (fr)
WO (1) WO2022012745A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003343469A (ja) * 2002-03-20 2003-12-03 Toyota Industries Corp 真空ポンプ
CN106968949B (zh) * 2012-05-21 2021-02-05 纳博特斯克汽车零部件有限公司 真空泵
JP2014084837A (ja) * 2012-10-26 2014-05-12 Aisan Ind Co Ltd 電動バキュームポンプ
WO2019034256A1 (fr) 2017-08-17 2019-02-21 Pierburg Pump Technology Gmbh Ensemble de pompes à vides de véhicule à moteur

Also Published As

Publication number Publication date
CN115803528A (zh) 2023-03-14
WO2022012745A1 (fr) 2022-01-20

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