EP0652375A1 - Gebläseeinheit - Google Patents

Gebläseeinheit Download PDF

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Publication number
EP0652375A1
EP0652375A1 EP94203055A EP94203055A EP0652375A1 EP 0652375 A1 EP0652375 A1 EP 0652375A1 EP 94203055 A EP94203055 A EP 94203055A EP 94203055 A EP94203055 A EP 94203055A EP 0652375 A1 EP0652375 A1 EP 0652375A1
Authority
EP
European Patent Office
Prior art keywords
blower
hub
back wall
motor
housing
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Withdrawn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
EP94203055A
Other languages
English (en)
French (fr)
Inventor
Ronald Joseph Goubeaux
James Joseph Christen
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.)
Motors Liquidation Co
Original Assignee
Motors Liquidation Co
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 Motors Liquidation Co filed Critical Motors Liquidation Co
Publication of EP0652375A1 publication Critical patent/EP0652375A1/de
Withdrawn legal-status Critical Current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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps

Definitions

  • This invention relates to blower assemblies and blower housing designs in general for air conditioning systems, and specifically to such a design with an improved, compact design for a cooling means used in conjunction with the blower motor and associated speed controller.
  • Vehicle heating and cooling systems have a blower assembly with an electric motor driven blower enclosed in a housing, often called a scroll housing.
  • the blower typically called a squirrel cage blower, has a cylindrical array of axially extending blades arranged so as to pull outside air axially in and send it radially outwardly in a circular, pressurised flow.
  • the scroll housing side wall that surrounds the vanes is not concentric, but follows a spiral pattern from a narrow point to a widest point near a tangentially located outlet opening.
  • the scroll housing wall stands out from a planar back wall, to which the electric motor is mounted and through which the end of the motor and the drive shaft protrude.
  • the blower has a hub secured at its centre to the motor drive shaft.
  • the blower hub is dome shaped, so as to clear the protruding end of the motor.
  • the circular perimeter edge of the hub runs parallel to the housing back wall, with a small gap.
  • the motor is cooled, in some designs, with an air tube that picks up moving air out of the scroll housing outlet and ducts it back to the motor housing.
  • Another approach is to provide vents or vane like structures in the blower hub to circulate air behind the hub, where it can impact on the protruding end of the motor, which is vented.
  • Yet another approach is to provide separate vanes on the back of the perimeter of the hub to pull air beneath the blower hub.
  • Another cooling demand is created by mechanisms that control the motor speed. Direct current motor speed control mechanisms may use a resister to dump extra power, which needs to be cooled. This is usually accomplished by placing the resistor downstream in the blower outlet air flow. Obviously, this represents somewhat of a flow obstruction.
  • Another cooling demand is created by motor speed control mechanisms, such as those using so called pulse width modulation, which incorporate heat producing power transistors.
  • Such speed controllers would, ideally, be located as close as possible to the motor, so as to minimise circuit wire lengths.
  • the precipitous switching effect of the transistors creates voltage spikes which, acting through long wires, can create RF interference.
  • Heat sinks to cool the power transistors of course, must conductively contact the transistors, and must be exposed to a cooling air stream. There is not a great deal of room available between the blower and scroll housing wall for such a heat sink, which also represents an obstruction to air flow. Nevertheless, that is where transistor heat sinks have been placed, so as to achieve proximity to the blower motor and its controller, and because it was thought that only there could enough cooling air flow be obtained.
  • a blower assembly in accordance with the present invention is characterised by the features specified in the characterising portion of Claim 1.
  • the present invention provides a heat sink arrangement that is much more compact, and which represents no obstruction to blower air flow, while maintaining maximum proximity to the blower motor and its controller.
  • the blower hub contrary to general practice, is left uninterrupted, without vents or holes. No structure is provided to deliberately move air beneath or behind the hub. In spite of the lack of openings through the hub surface, a good deal of air flow behind the hub is found to exist. The behind the hub air flow also has a detectable velocity pattern, and has been found to be greatest at a location just upstream from the narrow point of the blower-scroll wall clearance.
  • a heat sink is mounted to the housing back wall or blower motor mounting flange in the maximum air speed location, entirely beneath the blower hub. Adequate cooling is obtained with no obstruction of other air flow, and the heat sink is contained and protected within otherwise unused space.
  • the motor controller is mounted outside the back wall, just beneath the heat sink, and close to the motor and blower. Circuit wire length and RF interference are thereby minimised.
  • a vehicle heating and cooling system includes a blower assembly 10 comprised of a scroll housing, indicated generally at 12, a squirrel cage type blower, indicated generally at 14, and electric motor, indicated generally at 16.
  • Scroll housing 12 is adapted to be mounted to a non illustrated vehicle dash panel, which includes a fresh air inlet.
  • the housing 12 has a generally flat back wall 18 and a spiral shaped side wall 20 with an outlet opening 22 that feeds air into the rest of the heating and cooling system.
  • the blower 14 has a conventional cylindrical array of blades or vanes 24 at its perimeter. In the centre of the blower 14 is a dome shaped hub 26, which bulges upwardly considerably from an annular perimeter edge 28.
  • the upward bulge is provided primarily to clear the protruding end of the motor 16, which is secured to the housing back wall 18 and extends axially through it to a considerable degree.
  • the motor 16 is secured through housing back wall by a mounting flange 30 that is fixed to the back wall 18 with a sealing gasket 32.
  • the centre of the hub 26 is attached to the end of motor drive shaft 34, which serves to locate the hub perimeter edge 28 parallel to and very close to the inner surface of the housing back wall 18, surrounding the end of the motor 16. It will be noted that the hub 26 is uninterrupted by any vent holes or other openings.
  • the operation of the blower 14, in so far as supplying air to the heating and cooling system is concerned, is conventional.
  • the blades 24 are designed to pull air axially inwardly as the hub 26 is spun counter clockwise and sling it radially outwardly and into a counter clockwise vortex that ultimately exits through the tangentially located outlet 22.
  • What was unexpected was the airflow that was discovered beneath and behind the hub 26. While the blower 14 operated, a series of fifteen generally evenly spaced locations behind the hub 26 were probed to detect and measure air flow speed. The velocities of air flow discovered are graphed in Figure 3.
  • each velocity point around the circumference of the hub 26 is not so significant as the fact that a peak area of air flow speed exists, as shown by the dotted line in Figure 3. This corresponds roughly with the arcuate area between the lines A and B shown in Figure 1. Even more significant, of course, is the fact that air flow was found at all, when it had been thought that the only way to create such flow was to ventilate the hub 26, or provide separate vanes below the hub perimeter edge 28 to pull it in. The physical mechanism causing this flow is not perfectly understood, though there is an apparent rough correlation between the velocity and the narrowness of the radial clearance between the array of blades 24 and the scroll housing side wall 20. The A to B area corresponds to the narrowest clearance. There may or may not be causality along with the correlation.
  • the air flow beneath the hub 26 may have something to do with pressure differentials on opposite sides of the blower 14. It is also thought that the fact that the hub 26 is uninterrupted and unvented may be significant. At any rate, it is now clear that moving air does get under and through the small clearance between the hub edge 28 and the housing back wall 18, through whatever means.
  • the motor 16 is run by an electronic controller, the location of which is indicated by the dotted line 36.
  • the controller 36 is contained within an arcuate housing secured to the back of the motor flange 30, proximate to and concentric with both the blower 14 and the motor 16. The total package is thus compact and space efficient.
  • the details of the controller 36 are not important to the invention, but it is significant that it contains components, in this case, power transistors, which run quite hot.
  • the power transistors create voltage spikes which can translate into RF interference if they run through lengthy circuit wires. Because of the proximity of the controller 36 to the motor 16, the circuit wires can be short, minimising RF noise.
  • a heat sink is located behind the hub 26.
  • the heat sink 38 is a cast, extruded or machined aluminium or other heat conducting material piece, with a flat base 40 and three fins 42.
  • the base 40 fits beneath the hub perimeter edge 28, and the three fins 42 are profiled so as to fit in the sloped space available between the end of the motor 16 and the hub 26.
  • the heat sink 38 is not directly secured to the housing back wall 18, but is basically co-planar with it, since it is secured to the motor housing flange 30 and moves into place when the motor 16 is installed. It is also deliberately located in the area noted above where the air velocity is the highest.
  • the heat sink 38 is conductively connected to those elements of the controller 36, such as power transistors, that require cooling.
  • the ability to place the heat sink 38 in the otherwise unused space beneath the blower hub 26 lends itself to the compact arrangement of the housing 12, the blower 14 and the controller 36 described above.
  • the heat sink 38 can provide cooling while providing no obstruction whatsoever to air flow around the blower 14 or through the outlet 22. It is also protected and enclosed by the hub 26.
  • the heat sink 38 could be lengthened considerably into an arcuate shape, so as to fill more of the empty available volume behind hub the 26. Should it be necessary, because of the location of the controller 36, the heat sink 38 could be placed in a location other than right in the peak air velocity location shown. While it would not operate as efficiently, increasing its size as noted could compensate. It is thought that some voids in the surface of the hub 26 could be tolerated without significantly affecting the air flow beneath it. For example, a small opening might be provided for tool access, or to allow visual inspection of the heat sink after installation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP94203055A 1993-11-05 1994-10-20 Gebläseeinheit Withdrawn EP0652375A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14751793A 1993-11-05 1993-11-05
US147517 1993-11-05

Publications (1)

Publication Number Publication Date
EP0652375A1 true EP0652375A1 (de) 1995-05-10

Family

ID=22521891

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94203055A Withdrawn EP0652375A1 (de) 1993-11-05 1994-10-20 Gebläseeinheit

Country Status (1)

Country Link
EP (1) EP0652375A1 (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2742813A1 (fr) * 1995-12-26 1997-06-27 Valeo Climatisation Ventilateur centrifuge, notamment pour vehicule automobile
FR2772844A1 (fr) * 1997-12-23 1999-06-25 Valeo Thermique Moteur Sa Dispositif de canalisation d'un flux d'air, notamment pour vehicule automobile
WO2002080336A1 (en) * 2001-03-29 2002-10-10 Fläkt Woods AB Cooling of the electronics of an electrically operated device
EP1308631A1 (de) * 2001-11-02 2003-05-07 Valeo Climatisation Motorlüfter
WO2003038285A1 (fr) * 2001-11-02 2003-05-08 Valeo Climatisation Groupe moto-ventilateur
FR2831930A1 (fr) * 2001-11-02 2003-05-09 Valeo Climatisation Groupe moto-ventilateur comportant un module de commande integre universel
FR2831931A1 (fr) * 2001-11-02 2003-05-09 Valeo Climatisation Groupe moto-ventilateur a support moteur desaxe
EP1042854B1 (de) * 1998-07-28 2008-05-07 Robert Bosch Gmbh Kommutator-kleinmotor
US20080264600A1 (en) * 2005-10-20 2008-10-30 Behr Gmbh & Co. Kg Apparatus for Conveying a Cooling Air Flow
US9109610B2 (en) 2009-03-25 2015-08-18 Ebm-Papst Mulfingen Gmbh & Co. Kg Radial blower

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0345796A2 (de) * 1988-06-04 1989-12-13 Licentia Patent-Verwaltungs-GmbH Durch einen Elektromotor angetriebener Lüfter
DE3916791A1 (de) * 1988-10-28 1990-05-10 Piemontese Radiatori Geblaese-einbausatz, insbesondere fuer eine kraftwagenheizung
DE9113122U1 (de) * 1991-10-22 1992-01-23 Pierburg AG, 41460 Neuss Elektrisch angetriebene Luftpumpe
EP0501198A1 (de) * 1991-02-27 1992-09-02 Licentia Patent-Verwaltungs-GmbH Durch einen bürstenlosen Gleichstrommotor angetriebenes Gebläse mit einem spiralförmigen Gehäuse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0345796A2 (de) * 1988-06-04 1989-12-13 Licentia Patent-Verwaltungs-GmbH Durch einen Elektromotor angetriebener Lüfter
DE3916791A1 (de) * 1988-10-28 1990-05-10 Piemontese Radiatori Geblaese-einbausatz, insbesondere fuer eine kraftwagenheizung
EP0501198A1 (de) * 1991-02-27 1992-09-02 Licentia Patent-Verwaltungs-GmbH Durch einen bürstenlosen Gleichstrommotor angetriebenes Gebläse mit einem spiralförmigen Gehäuse
DE9113122U1 (de) * 1991-10-22 1992-01-23 Pierburg AG, 41460 Neuss Elektrisch angetriebene Luftpumpe

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2742813A1 (fr) * 1995-12-26 1997-06-27 Valeo Climatisation Ventilateur centrifuge, notamment pour vehicule automobile
FR2772844A1 (fr) * 1997-12-23 1999-06-25 Valeo Thermique Moteur Sa Dispositif de canalisation d'un flux d'air, notamment pour vehicule automobile
EP1042854B1 (de) * 1998-07-28 2008-05-07 Robert Bosch Gmbh Kommutator-kleinmotor
WO2002080336A1 (en) * 2001-03-29 2002-10-10 Fläkt Woods AB Cooling of the electronics of an electrically operated device
EP1308631A1 (de) * 2001-11-02 2003-05-07 Valeo Climatisation Motorlüfter
FR2831930A1 (fr) * 2001-11-02 2003-05-09 Valeo Climatisation Groupe moto-ventilateur comportant un module de commande integre universel
FR2831929A1 (fr) * 2001-11-02 2003-05-09 Valeo Climatisation Groupe moto-ventilateur comportant un radiateur integre
FR2831931A1 (fr) * 2001-11-02 2003-05-09 Valeo Climatisation Groupe moto-ventilateur a support moteur desaxe
US6754075B2 (en) 2001-11-02 2004-06-22 Valeo Climatisation Motor-fan unit particularly for a heating and/or air conditioning apparatus for a motor vehicle
WO2003038285A1 (fr) * 2001-11-02 2003-05-08 Valeo Climatisation Groupe moto-ventilateur
US20080264600A1 (en) * 2005-10-20 2008-10-30 Behr Gmbh & Co. Kg Apparatus for Conveying a Cooling Air Flow
US8230910B2 (en) * 2005-10-20 2012-07-31 Behr Gmbh & Co. Kg Apparatus for conveying a cooling air flow having a cooling domes
US9109610B2 (en) 2009-03-25 2015-08-18 Ebm-Papst Mulfingen Gmbh & Co. Kg Radial blower

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