EP2180194A1 - Dispositif de ventilateur - Google Patents

Dispositif de ventilateur Download PDF

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Publication number
EP2180194A1
EP2180194A1 EP08018675A EP08018675A EP2180194A1 EP 2180194 A1 EP2180194 A1 EP 2180194A1 EP 08018675 A EP08018675 A EP 08018675A EP 08018675 A EP08018675 A EP 08018675A EP 2180194 A1 EP2180194 A1 EP 2180194A1
Authority
EP
European Patent Office
Prior art keywords
flow
fan
blower device
fan wheel
pressure chamber
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Withdrawn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
EP08018675A
Other languages
German (de)
English (en)
Inventor
Ernst Claussen
Joachim J. Hylla
Oliver Witt
Yingan Xia
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.)
Punker GmbH
Original Assignee
Punker 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 Punker GmbH filed Critical Punker GmbH
Priority to EP08018675A priority Critical patent/EP2180194A1/fr
Publication of EP2180194A1 publication Critical patent/EP2180194A1/fr
Withdrawn legal-status Critical Current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
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/288—Part of the wheel having an ejecting effect, e.g. being bladeless diffuser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
    • F04D29/162—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of a centrifugal flow wheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
    • F04D29/164—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of an axial flow wheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/326—Rotors specially for elastic fluids for axial flow pumps for axial flow fans comprising a rotating shroud

Definitions

  • the present invention relates to a blower device, in particular for use as a circulating air or exhaust fan for room air conditioning or fume extraction.
  • the fan device comprises a fan as well as a first flow guide and a second flow guide.
  • the first flow control member separates a pressure space in which the fan wheel is arranged from a suction space and has at least one inflow opening for sucking a gaseous fluid from the suction space into the pressure space, which is arranged in the area of the fan wheel.
  • the second flow-guiding element is provided in the region of the inflow opening of the first flow-guiding member for improving the flow from the suction space into the pressure space by forcing an axial main flow in the intake area of the fan wheel.
  • a first flow-guiding element in the form of an air guide between an intake space and a fan or pressure chamber is used.
  • the air guide plate has a central inflow opening for an influx of the gaseous fluid to the fan and, where appropriate, exhaust openings for a backflow of the gaseous fluid after passing the fan wheel in the suction.
  • the fan arranged in the pressure chamber the Aspirate gaseous fluid in the manner of a recirculation flow from the suction through the inlet opening and blow out via the optionally provided exhaust openings.
  • the DE 203 14 818 U1 deals with a targeted blowing of gaseous fluid from the pressure chamber into the suction via specially arranged exhaust openings in the first flow control.
  • Second Strömungsleitglieder for enforcing a homogeneous flow in the suction chamber are also in the DE 203 12 031 U1 disclosed.
  • a generic flow guide is, for example, the DE 10 2004 004 393 B4 refer to.
  • a first flow-guiding element is designed with a second flow-guiding element in the region of its inflow opening. More specifically, the edge of the first Strömungsleitglieds, which is designed as a baffle plate, formed in the region of its inflow opening as a cone-shaped nozzle.
  • This nozzle serves as a suction nozzle and improves the suction of gaseous fluid from a suction in a fan room of a cooking appliance.
  • the disadvantage here is that between a rotating fan in the fan room and the suction on the air baffle under all operating conditions always a gap to avoid damage must be present.
  • This gap is, especially in recirculation or exhaust fans, kept large due to tolerances, so that the gaseous Fluid can flow directly from the pressure chamber back into the intake of the fan wheel.
  • the gaseous fluid is therefore not guided via a blow-out opening into the suction space and via the inflow opening of the air guide plate into the intake area of the fan wheel. Rather, there is an undesirable short circuit of the flow of accelerated by the fan gaseous fluid with the flow of the fan wheel sucked, flowing from the suction through the inlet opening of the baffle gaseous fluid.
  • the flow of the gaseous fluid passing through the gap is called short-circuit flow and, since it occurs at a very sensitive point in the intake area of the fan wheel, namely in the deflection area of a main flow from the suction space into the pressure space, should be kept as low as possible. More specifically, the short-circuit flow occurs where the gaseous fluid is deflected from a radial direction to an axial direction of the main flow. Thus, the short-circuit flow is transverse to the main flow in the intake area of the fan wheel, so that it narrows the main flow and may itself cause detachment and swirling of the main flow. This leads to a total reduction in the efficiency of the circulation of the gaseous fluid through the fan.
  • Object of the present invention is therefore to further develop the generic blower device such that it overcomes the disadvantages of the prior art.
  • the efficiency for the circulation of the gaseous fluid should be improved.
  • This object is achieved in that the second flow guide is attached or formed on the fan. This ensures an advantageous guidance of the gaseous fluid in the intake region of the fan wheel.
  • a spacing between the second flow guide member and the fan wheel is required to ensure a sufficiently large movement gap.
  • only a movement gap between the first and the second flow-guiding element is to be provided by the connection of the fan impeller and the second flow-guiding element. This movement gap is much easier to handle both with regard to the fluidic guidance of the gaseous fluid and with regard to the dimensional tolerances to be maintained and thus enables a cost-effective production of the fan device with comparable or improved performance with the prior art.
  • the fan is designed as a radial fan, which has a plurality of attached to a base plate blades and that the second flow guide attached to the base plate and / or on an annular support ring and / or on at least one blade or is formed.
  • a circulation flow for the gaseous fluid can be produced in an advantageous manner, as required in particular in a circulating air fan.
  • the gaseous fluid is deflected several times, so that there is a bevy of annular flow paths and the fluid particles pass the radial fan wheel recurrently.
  • the second Strömungsleitglied is annular, in particular as Halbtorus, or that a plurality of blades, in particular each blade, each associated with a second flow guide, which, in particular designed as a blade extension, extends through a support ring ,
  • a ring-shaped second Strömungsleitglied can be mounted or molded in particular on the holding device and is in terms of the operating characteristics of the fan, especially with respect to the high rotational speeds particularly important concentricity properties, well controlled by the ring structure, especially easy to balance.
  • the annular second Strömungsleitglied is formed as Halbtorus.
  • a half-torus can be made by flaring the outer ends of an axially extending metal ring radially outward.
  • the second flow guide member is formed by a plurality of Strömungsleitgliedern associated with the respective blades, in particular all blades, and which preferably extend through a serving to stabilize the free ends of the blades support ring axially in the direction of the suction space.
  • the second flow-guiding member extends from the fan wheel at least as far as the inlet opening of the first flow-guiding member, preferably into the suction chamber, and / or the second flow-guiding member extends in the pressure chamber up to the pressure region of the fan.
  • the second flow-guiding element for providing a nozzle function has a substantially hook-shaped cross-section or a U-shaped cross-section, preferably asymmetrical with an extended free end in the pressure chamber.
  • the second flow-guiding element In the cross-sectional plane which contains the axis of rotation of the blower device, the second flow-guiding element has a geometry that is convex relative to the axis of rotation, that is to say radially outward. It is thereby achieved that the gaseous fluid sucked in by the fan device is passed through a cross-section which initially narrows in the direction of flow and then widens again, as a result of which the desired nozzle function is ensured.
  • the second flow-guiding element preferably projects beyond or overlaps the edge of the inflow opening of the first flow-guiding element.
  • a third flow-guiding element is provided in the pressure chamber, which delimits a blow-out region of the radial fan which widens conically radially outward from the fan wheel of the radial fan.
  • the third flow-guiding element is an extension of the second flow-guiding element, in particular at the free end of the second flow-guiding element in the pressure chamber.
  • the first flow-guiding member, the second flow-guiding member and / or the third flow-guiding member are each formed from at least one stamped and bent part and / or sheet and / or detachably fastened and / or at least partially or in sections movable.
  • the end of the second flow-guiding element in the pressure chamber extends into a recess in the first and / or third flow-guiding element.
  • the first flow guide at least one exhaust opening for blowing gaseous fluid from the pressure chamber into the suction in the operation of the fan limited.
  • the first flow guide to a double function, it not only seals off the pressure chamber from the suction, but it also allows a targeted outflow of promoted by the fan gaseous fluid into the suction.
  • the invention is thus based on the surprising finding that the cooperation of a first stationary flow guide member, which may be in the form of a conventional air guide plate, for example, and a second flow guide member which is designed in the manner of a nozzle extending from a fan in the Pressure chamber extends in the direction of the suction, an improvement in the efficiency of the blower device can be achieved.
  • the blower device is used in a circulating air or exhaust fan.
  • the first Strömungsleitglied separates the interior of the circulating air or Ab povertygebläses in a pressure chamber and in a suction, wherein the first Strömungsleitglied between the pressure chamber and the suction a central inlet opening and at least one edge-side exhaust opening and is free attached to the wall of the interior.
  • the second flow guide acts as a nozzle and is inventively attached to the fan or formed on this, so that the second flow control rotates with the fan.
  • radial fans are inherently relatively compact and have a high efficiency, they are preferably used with a flow guiding device according to the invention.
  • the high-pressure region the pressure side of the fan
  • the suction region the suction side of the fan
  • the second air-guiding device according to the invention which can be designed as a nozzle on the radial fan, considerably increases the fan power or reduction the power of the fan motor is present.
  • the nozzle Due to the dimensioning and geometry of the nozzle can be further advantages in the targeted flow guidance cause. As the nozzle in the pressure space extends to the area where the blades of the centrifugal fan cause an increase in pressure, the amount of short-circuit flow is reduced. When the nozzle extends into the suction space, the formation of vortices in the suction area of the radial fan is suppressed.
  • FIG. 1 a cross-sectional view of a blower device designed as a circulating air blower.
  • An exemplary circulating-air blower 12 provided with the blower device 10 according to the invention comprises, as in FIG Fig. 1
  • the interior space 14 may, for example, be a space, not shown to scale, in a building in which an air circulation is realized with the aid of the circulating air blower 12.
  • In the interior 14 are an example as a radial fan configured impeller 16 and a first flow guide 18, a second flow control member 20 and a third flow control member 22 are arranged, which form the blower device 10 substantially.
  • the fan 16 is rotatably connected to a drive shaft, not shown, which is associated with a motor, not shown, which is mounted outside of the interior 14.
  • the radial fan for example, an axial fan could be used.
  • the radial fan has the advantage over an axial fan that the gaseous fluid is already deflected in the fan 16 and only then takes place the acceleration of the fluid in the radial direction to the outside.
  • the leaked from the fan 16 fluid for a recirculation flow as provided by way of example for the circulating air fan 12, compared with an axial fan after acceleration has to be redirected once less.
  • the blower device 10 can be made compact and operated with high efficiency.
  • the fan 16 sucks the gaseous fluid centrally from an annular, concentric with the fan 16 trained intake 24, in which thus a Einsaugströmung 26 is present.
  • the gaseous fluid sucked in by the fan wheel 16 is accelerated by the rotation of the fan wheel 16 and blown out in the radial direction into a discharge region 28 in which a discharge flow 30 is thus present.
  • a plurality of flow guide members 18, 20, 22 are arranged in the interior 14, each for example in shape are formed by air baffles.
  • the first flow guide 18 divides the interior 14 into a suction chamber 50 and into a pressure chamber 48 and is attached to the walls of the interior 14 releasably lockable, for example, via webs, not shown.
  • the first flow-guiding element 18 leaves open blow-out openings 32, which are designed as gaps, for the blow-off flow 30. In a central region, it has an inflow opening 34, through which the intake flow 26 flows in the direction of the fan wheel 16.
  • a circulating flow can be caused by the blower device 10, in which the gaseous fluid is sucked through the inflow opening 34 from the fan 16 and blown out into the blow-out area 28 to flow back from there through the blow-out openings 32 into the intake area 24.
  • the second flow-guiding member 20 is arranged, which is attached to the fan wheel 16 and which acts as a nozzle.
  • the second flow control member 20 enhances the redirection of the gaseous fluid from the aspiration region 24 into the impeller 16 and inhibits cross and countercurrents that may result in undesirable short circuit flows that affect the performance of the fan.
  • the second flow-guiding member 20 guides the gaseous fluid into the fan wheel 16 mainly in the axial direction. Due to the design of the fan wheel 16, the gaseous fluid is sucked in, especially in the radial edge region of the intake region 24 of the fan wheel 16 in the form of a main flow 36.
  • the second flow guide 20 is in its arrangement and dimensioning both on the below described geometry of the fan 16 and adapted to the inflow opening 34 of the first flow 18.
  • the fan 16 comprises a hub 38 which is provided for attachment to the drive shaft, not shown, and which is connected to an annular base plate 40.
  • a plurality of circumferentially equally spaced blades 42 are mounted, which have a curvature in the radially outward direction and in the direction of a central axis 44 are rectilinearly.
  • Each of the base plate 40 opposite ends of the blades 42 carry a radially outwardly open half-orbit, which serves as an annular, second flow control member 20.
  • each of the base plate opposite ends of the blades carry an annular support ring on which the base plate of opposite surface serving as a second flow guide half-gate with radially outwardly facing opening is attached.
  • the second flow-guiding member 20 By attaching the second flow-guiding member 20 to the fan wheel 16, it is ensured that the gaseous fluid sucked in by the blades 42 can pass through the nozzle formed upstream of the flow guide in the flow direction without a short-circuit flow known to be disadvantageous from the prior art can. This is due to the fact that in the illustrated embodiment of the invention, the second flow control member 20 is attached directly to the blades 42 and thus between the second flow control member 20 and the blades 42nd there is no gap through which a short circuit flow could flow.
  • second Strömungsleitglieder in the form of further blades, which extend in the direction of the first Strömungsleitglieds or as extensions of the blades, which extend in the direction of the first Strömungsleitglieds, formed.
  • This embodiment increases the intake of the fan with the same space, whereby the capacity of the fan is increased.
  • the second flow guide 20 allows both in the illustrated embodiment as annular circumferential, radially outwardly open half-orbit and in the embodiment not shown as a plurality of blade extensions a relatively free execution of the inflow opening 34 of the first Strömungsleitglieds 18. It is particularly advantageous according to the invention second flow guide 18, the first flow guide 20 engages around, as shown in the FIG. 1 is shown. In this case, the cross-section through which the fluid can flow through of the first flow-guiding member 18 can only be selected to be slightly larger than the cross-section of the second flow-guiding member 20 through which the fluid flows. The proportion of the fluid compressed by the fan wheel 16 passing through the gap 46 between the first and second flow-guiding members 18, 20 flows, can be kept small.
  • the gap 46 can be dimensioned so that even with a thermal expansion of the Strömungsleitglieder 18, 20 and / or in a runout of the fan 16, a contact between the Strömungsleitgliedern 18, 20 can be excluded.
  • the gap 46 establishes a connection between a pressure chamber 48, in which the fan wheel 16 is arranged, and a suction chamber 50 which is divided off from the pressure chamber 48 by the first flow conductor 18. Between the pressure chamber 48 and the suction chamber 50, a large pressure difference prevails during the rotation of the fan wheel 16 about the central axis 44, which leads to partial flows 52 which split off from the blow-off flow 30.
  • the partial flows 52 first pass through the third flow control element 22 described in more detail below, in order subsequently in the radial direction to flow inwardly radially outwardly open halftorus of the second flow-guiding member 20.
  • the partial flow 52 Due to the concave configuration of the second flow-guiding member 20 with respect to the central axis 44, the partial flow 52 is deflected from the radially inwardly directed flow direction into a radially outwardly directed flow direction and thus exits the gap 46 radially outward.
  • the fact that the maximum outer diameter of the second Strömungsleitglieds 20 is greater than the diameter of the inflow opening 34 is selected, it is achieved that the partial flows 52 or only to a very limited extent with the Einsaugströmung 26 so that a disturbance of Einsaugströmung 26 by the partial flows 52nd can be almost completely excluded. Rather, the first and the second flow guide 18, 20 act together in the manner of a labyrinth seal, the efficiency of which increases as the rotational speed of the fan 16 due to the surface effects occurring despite the increasing pressure difference at least equal or even increases.
  • the third flow-guiding element 22 is embodied by way of example in the form of a further air guide plate and can be mounted on the first flow-guiding element 18 or integrally formed with the first flow-directing element 18.
  • the third Strömungsleitglied 22 is presently designed as a perforated plate and has a centrally disposed, circular recess 58, which is selected to be larger than the maximum outer diameter of the fan 16 to avoid contact between the rotating fan 16 and the third Strömungsleitglied 22, as the first flow guide 18 is fixedly mounted in the circulating air fan 12.
  • the third flow control element 22 is intended to ensure that the fan wheel 16 discharged exhaust flow 30 with the lowest possible pressure loss back into the suction chamber 50 can flow.
  • the third flow-guiding element 22 forms a diffuser with the rear wall 54 of the pressure chamber 48.
  • the outflow of the fan 16 exhaust flow 30 is reduced by this increase in the available flow cross-section in their speed, at the same time there is an increase in pressure. Due to the reduced flow rate of the gaseous fluid, this can flow out with low friction losses through the exhaust openings 32 into the suction chamber 50. In addition, the reduced flow velocity avoids vortexes in the gaseous fluid, which also leads to a reduction in the flow resistance for the recirculation flow.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP08018675A 2008-10-24 2008-10-24 Dispositif de ventilateur Withdrawn EP2180194A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08018675A EP2180194A1 (fr) 2008-10-24 2008-10-24 Dispositif de ventilateur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08018675A EP2180194A1 (fr) 2008-10-24 2008-10-24 Dispositif de ventilateur

Publications (1)

Publication Number Publication Date
EP2180194A1 true EP2180194A1 (fr) 2010-04-28

Family

ID=40673654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08018675A Withdrawn EP2180194A1 (fr) 2008-10-24 2008-10-24 Dispositif de ventilateur

Country Status (1)

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EP (1) EP2180194A1 (fr)

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3285501A (en) * 1964-12-07 1966-11-15 John E Mcdonald Centrifugal fans
US3842902A (en) * 1973-07-05 1974-10-22 Hayes Albion Corp Labyrinthian fan
FR2441722A1 (fr) * 1978-11-16 1980-06-13 Sueddeutsche Kuehler Behr Installation de refroidissement pour moteurs a combustion interne, en particulier pour moteurs de vehicules
US4432694A (en) * 1980-02-25 1984-02-21 Hitachi, Ltd. Blower
US4566852A (en) * 1982-03-15 1986-01-28 Sueddeutsche Kuehlerfabrik Julius Fr. Behr Gmbh & Co. Kg Axial fan arrangement
US5183382A (en) * 1991-09-03 1993-02-02 Caterpillar Inc. Low noise rotating fan and shroud assembly
EP0703367A2 (fr) * 1994-09-21 1996-03-27 LOMBARDINI FABBRICA ITALIANA MOTORI S.p.A. Système de propulsion d'air pour éclangeurs de chaleur pour moteurs à combustion interne
EP0955468A2 (fr) * 1998-05-04 1999-11-10 Carrier Corporation Ventilateur radial et assemblage ventilateur/orifice
DE20309268U1 (de) 2003-06-12 2004-06-09 Rational Ag Gargeräte mit Luftleitgliedern
DE20314818U1 (de) 2003-09-24 2004-06-09 Rational Ag Gargerät mit Luftleitglied
DE20312031U1 (de) 2003-08-04 2004-06-17 Rational Ag Gargeräte mit Luftleitgliedern
DE102004004393B3 (de) 2004-01-29 2005-05-25 Rational Ag Gargerät, Luftleitglied, Haltevorrichtung und Verfahren zum Reinigen eines Gargeräts
FR2879266A1 (fr) * 2004-12-15 2006-06-16 Valeo Systemes Dessuyage Systeme de ventilateur comportant des moyens de limitation de debit d'air parasite

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3285501A (en) * 1964-12-07 1966-11-15 John E Mcdonald Centrifugal fans
US3842902A (en) * 1973-07-05 1974-10-22 Hayes Albion Corp Labyrinthian fan
FR2441722A1 (fr) * 1978-11-16 1980-06-13 Sueddeutsche Kuehler Behr Installation de refroidissement pour moteurs a combustion interne, en particulier pour moteurs de vehicules
US4432694A (en) * 1980-02-25 1984-02-21 Hitachi, Ltd. Blower
US4566852A (en) * 1982-03-15 1986-01-28 Sueddeutsche Kuehlerfabrik Julius Fr. Behr Gmbh & Co. Kg Axial fan arrangement
US5183382A (en) * 1991-09-03 1993-02-02 Caterpillar Inc. Low noise rotating fan and shroud assembly
EP0703367A2 (fr) * 1994-09-21 1996-03-27 LOMBARDINI FABBRICA ITALIANA MOTORI S.p.A. Système de propulsion d'air pour éclangeurs de chaleur pour moteurs à combustion interne
EP0955468A2 (fr) * 1998-05-04 1999-11-10 Carrier Corporation Ventilateur radial et assemblage ventilateur/orifice
DE20309268U1 (de) 2003-06-12 2004-06-09 Rational Ag Gargeräte mit Luftleitgliedern
DE20312031U1 (de) 2003-08-04 2004-06-17 Rational Ag Gargeräte mit Luftleitgliedern
DE20314818U1 (de) 2003-09-24 2004-06-09 Rational Ag Gargerät mit Luftleitglied
DE102004004393B3 (de) 2004-01-29 2005-05-25 Rational Ag Gargerät, Luftleitglied, Haltevorrichtung und Verfahren zum Reinigen eines Gargeräts
FR2879266A1 (fr) * 2004-12-15 2006-06-16 Valeo Systemes Dessuyage Systeme de ventilateur comportant des moyens de limitation de debit d'air parasite

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