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EP0446316B1 - Miniature fan - Google Patents

Miniature fan Download PDF

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Publication number
EP0446316B1
EP0446316B1 EP90913243A EP90913243A EP0446316B1 EP 0446316 B1 EP0446316 B1 EP 0446316B1 EP 90913243 A EP90913243 A EP 90913243A EP 90913243 A EP90913243 A EP 90913243A EP 0446316 B1 EP0446316 B1 EP 0446316B1
Authority
EP
European Patent Office
Prior art keywords
fan
fan wheel
air
hub
impeller
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.)
Expired - Lifetime
Application number
EP90913243A
Other languages
German (de)
French (fr)
Other versions
EP0446316A1 (en
EP0446316B2 (en
Inventor
Peter Meier
Ernst Scherrer
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.)
Micronel AG
Original Assignee
Micronel AG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=4258189&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0446316(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Micronel AG filed Critical Micronel AG
Publication of EP0446316A1 publication Critical patent/EP0446316A1/en
Application granted granted Critical
Publication of EP0446316B1 publication Critical patent/EP0446316B1/en
Publication of EP0446316B2 publication Critical patent/EP0446316B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • 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

Definitions

  • the invention relates to a small fan according to the preamble of independent claim 1.
  • a small fan of this type has become known from the applicant's US-A-4,504,751.
  • the electric motor is accommodated in the externally circular-cylindrical hub of a one-piece impeller, which enables particularly small external dimensions in the event of axial air outlet on the back of the air duct housing.
  • This fan has therefore found many uses. In some applications, however, the noise that occurs is annoying.
  • a diagonal fan is known from DE-A-29 44 183, in which, however, the jacket of the hub of the impeller is circular-conical or concave paraboloidal and which has a radial flow outlet. Since the motor is arranged separately from the wing on the back, a flat design as with the generic fan is fundamentally not possible.
  • the applicant has now set itself the task of developing the generic fan in such a way that it has a higher output with the same external dimensions and at the same time is quieter and can be manufactured more cost-effectively.
  • the small fan according to the invention has an approximately laminar flow. Since there is essentially no turbulence in the polluting air, it is considerably quieter. This is an improvement that has long been sought in this field.
  • a particularly flat design with a favorable power density is achieved according to a development of the invention in that the impeller front edges and the hub front and the housing front lie approximately in the same plane.
  • the small fan has a cuboidal air duct housing 2 with an outer part 2a and a circular recess 2f.
  • a known electric motor 4 with electromagnetic coils 4a is attached to a molded-on base 2b.
  • the arms 4c connect the electric motor 4 to the outer housing part 2a.
  • An impeller 1 made of plastic is inserted into the recess 2f and rotatably mounted in the housing 2 by means of an axis 3 and a bearing 6.
  • the shaft 3, which is fixedly connected to the impeller 1, is surrounded by an annular permanent magnet 5, which forms part of the electric motor 4.
  • the impeller 1 preferably has five integrally formed blades 1 a, each of which has the same angle of attack ⁇ over the entire depth of the blade and thus parallel blade edges (FIG. 3). It has been shown that a particularly favorable ratio between volume flow and sound is achieved with a number of blades between 3 and 7.
  • the wings are not twisted and have the same cross-section as shown in FIG. 3 up to their attachment point.
  • the angle of attack is preferably about 30 °.
  • the air enters the fan axially through the front face 2d of the fan and also leaves it in the axial direction through the rear face 2e.
  • the inflow to the impeller and the outflow are therefore largely axial.
  • the impeller 1, however, is flowed through diagonally as indicated by the flow lines 7.
  • the hub 2d of the impeller 1 has a flat front surface 1c which lies approximately in one plane with the housing front 2d and the leading edge 1b of the wing.
  • the flow surface 1e of the hub 1d adjoining the surface 1c has the shape shown in FIG. 1.
  • the flow areas 1e and 1f of the vanes 1a result from the section according to FIG. 3.
  • the hubs and vanes are designed such that the flow of air through the housing is laminar and essentially no pressure differences occur on the vanes in the radial direction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The miniature fan has a plastic air-guide casing (2) in which is rotatably fitted an impeller (1) in the form of a meridian-flow fan. The blades (1a) of the impeller (1) are not twisted and exhibit the same pitch over their entire depth. The leading edges (1b) of the impeller, the front of the hub (1c) and the front of the casing (2d) lie in about the same plane. Meridian-flow fans have the advantage over the axial type of providing greater power density with less noise.

Description

Die Erfindung betrifft einen Kleinventilator nach dem Oberbegriff des unabhängigen Patentanspruchs 1.The invention relates to a small fan according to the preamble of independent claim 1.

Ein Kleinventilator dieser Gattung ist durch die US-A-4,504,751 der Anmelderin bekannt geworden. Bei diesem ist der Elektromotor in der aussenseitig kreiszylindrischen Nabe eines einstückigen Flügelrades untergebracht, was bei axialem Luftaustritt auf der Rückseite des Luftführungsgehäuses besonders kleine Aussenabmessungen ermöglicht. Dieser Ventilator hat deshalb viele Anwendungen gefunden. Bei einigen Anwendungen sind jedoch die auftretenden Geräusche störend. Ferner ist durch die DE-A-29 44 183 ein Diagonalgebläse bekannt, bei dem jedoch der Mantel der Nabe des Flügelrades kreiskegelförmig oder konkav paraboloidisch ist und das einen radialen Strömungsaustritt besitzt. Da der Motor getrennt vom Flügel an der Rückseite angeordnet ist, ist eine flache Bauweise wie beim gattungsgemässen Ventilator grundsätzlich nicht möglich. Die Anmelderin hat sich nun die Aufgabe gestellt, den gattungsgemässen Ventilator dahingehend weiterzubilden, dass er bei gleichen Aussenmassen eine höhere Leistung aufweist und gleichzeitig leiser ist und kostengünstiger hergestellt werden kann. Dererfindungsgemässe Kleinventilatorweist im Gegensatz zum oben genannten Ventilator, der ein kleines Axialgebläse ist, einen angenähert laminaren Durchfluss auf. Da in der durchstörmenden Luft im wesentlichen somit keine Verwirbelungen auftreten, ist er wesentlich leiser. Damit wird eine auf diesem Fachgebiet seit langem angestrebte Verbesserung erreicht.A small fan of this type has become known from the applicant's US-A-4,504,751. In this case, the electric motor is accommodated in the externally circular-cylindrical hub of a one-piece impeller, which enables particularly small external dimensions in the event of axial air outlet on the back of the air duct housing. This fan has therefore found many uses. In some applications, however, the noise that occurs is annoying. Furthermore, a diagonal fan is known from DE-A-29 44 183, in which, however, the jacket of the hub of the impeller is circular-conical or concave paraboloidal and which has a radial flow outlet. Since the motor is arranged separately from the wing on the back, a flat design as with the generic fan is fundamentally not possible. The applicant has now set itself the task of developing the generic fan in such a way that it has a higher output with the same external dimensions and at the same time is quieter and can be manufactured more cost-effectively. In contrast to the above-mentioned fan, which is a small axial fan, the small fan according to the invention has an approximately laminar flow. Since there is essentially no turbulence in the polluting air, it is considerably quieter. This is an improvement that has long been sought in this field.

Versuche haben nun gezeigt, dass beim erfindungsgemässen Ventilator die Leistungsdichte verglichen mit dem einen Axialventilator etwa um 30% höher ist. Obwohl seit langem bekannt ist, das meridianbeschleunigte Gebläse eine günstige Leistungsdichte aufweisen, hatte diese Erkenntnis bisher den Bau der Kleinventilatoren nicht beeinflusst. Wesentlich ist nun, dass die Flügel des Flügelrades nicht verwunden sind und jeweils über die ganze Flügeltiefe den gleichen Anstellwinkel aufweisen. Das Flügelrad kann deshalb bei einfacher Entformung einstückig und damit kostengünstig im Spritzgussverfahren hergestellt werden.Tests have now shown that the power density in the fan according to the invention is approximately 30% higher compared to the one axial fan. Although it has long been known that meridian-accelerated fans have a favorable power density, this finding had not previously influenced the construction of the small fans. It is essential that the blades of the impeller are not twisted and have the same angle of attack over the entire depth of the blade. The impeller can therefore be manufactured in one piece with simple demolding and therefore inexpensively in the injection molding process.

Durch die Kombination der erfindungswesentlichen Merkmale wird somit bei einfacher Herstellung ein Ventilator mit günstigeren Betriebseigenschaften geschaffen.By combining the features essential to the invention, a fan with more favorable operating properties is thus created with simple manufacture.

Eine besonders flache Bauweise bei günstiger Leistungsdichte wird nach einer Weiterbildung der Erfindung dadurch erreicht, dass die Flügelradvorderkanten und die Nabenfrontseite sowie die Gehäusefrontseite etwa in gleiche Ebene liegen.A particularly flat design with a favorable power density is achieved according to a development of the invention in that the impeller front edges and the hub front and the housing front lie approximately in the same plane.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnungen näher erläutert. Es zeigen:

  • Fig. 1 einen Schnitt durch einen erfindungsgemässen Kleinventilator,
  • Fig. 2 eine Teilansicht eines Flügelrades,
  • Fig. 3 einen Schnitt durch einen Flügel entlang der Linie 111-111 in Fig. 2, und
  • Fig. 4 eine Ansicht des Luftführungsgehäuses.
An embodiment of the invention is explained below with reference to the drawings. Show it:
  • 1 shows a section through a small fan according to the invention,
  • 2 is a partial view of an impeller,
  • Fig. 3 shows a section through a wing along the line 111-111 in Fig. 2, and
  • Fig. 4 is a view of the air duct housing.

Der Kleinventilator weist ein quaderförmiges Luftführungsgehäuse 2 mit einem Aussenteil 2a und einer kreisrunden Ausnehmung 2f auf. Auf einem angeformten Boden 2b ist ein bekannter Elektromotor 4 mit Elektromagnetspulen 4a angebracht. Mit Armen 2c ist der Elektromotor 4 mit dem Gehäuseaussenteil 2a verbunden.The small fan has a cuboidal air duct housing 2 with an outer part 2a and a circular recess 2f. A known electric motor 4 with electromagnetic coils 4a is attached to a molded-on base 2b. The arms 4c connect the electric motor 4 to the outer housing part 2a.

Ein aus Kunststoff hergestelltes Flügelrad 1 ist in die Ausnehmung 2f eingesetzt und mittels einer Achse 3 und einem Lager 6 rotierbar im Gehäuse 2 gelagert. Die fest mit dem Flügelrad 1 verbundene Achse 3 ist von einem ringförmigen Dauermagneten 5 umgeben, der ein Bestanteil des Elektromotors 4 bildet.An impeller 1 made of plastic is inserted into the recess 2f and rotatably mounted in the housing 2 by means of an axis 3 and a bearing 6. The shaft 3, which is fixedly connected to the impeller 1, is surrounded by an annular permanent magnet 5, which forms part of the electric motor 4.

Wie insbesondere die Fig. 2 und 3 zeigen, besitzt das Flügelrad 1 vorzugsweise fünf angeformte Flügel 1a, die jeweils über die gesamte Flügeltiefe den gleichen Anstellwinkel a und somit parallele Schaufelkanten (Fig. 3) aufweisen. Es hat sich gezeigt, dass bei einer Flügelzahl zwischen 3 und 7 ein besonders günstiges Verhältnis zwischen Volumenstrom und Schall erreicht wird. Die Flügel sind nicht verwunden und besitzen bis zu ihrer Ansatzstelle den gleichen wie in Fig. 3 gezeigten Querschnitt. Der Anstellwinkel beträgt vorzugsweise etwa 30°. In der Darstellung nach Fig. 1 tritt die Luft durch die Gehäusefrontseite 2d axial in den Ventilator ein und verlässt diesen ebenfalls in axialer Richtung durch die Gehäuserückseite 2e. Die Zuströmung zum Laufrad und die Abströmung erfolgt somit weitgehend axial. Das Flügelrad 1 wird hingegen wie durch die Strömungslinien 7 angedeutet diagonal durchströmt.As shown in FIGS. 2 and 3 in particular, the impeller 1 preferably has five integrally formed blades 1 a, each of which has the same angle of attack α over the entire depth of the blade and thus parallel blade edges (FIG. 3). It has been shown that a particularly favorable ratio between volume flow and sound is achieved with a number of blades between 3 and 7. The wings are not twisted and have the same cross-section as shown in FIG. 3 up to their attachment point. The angle of attack is preferably about 30 °. In the illustration according to FIG. 1, the air enters the fan axially through the front face 2d of the fan and also leaves it in the axial direction through the rear face 2e. The inflow to the impeller and the outflow are therefore largely axial. The impeller 1, however, is flowed through diagonally as indicated by the flow lines 7.

Die Nabe 2d des Flügelrades 1 weist eine ebene Frontfläche 1 c auf, die mit der Gehäusefrontseite 2d sowie den Flügelvorderkanten 1 b etwa in einer Ebene liegen. Die an die Fläche 1c anschliessende Strömungsfläche 1e der Nabe 1d weist die aus Fig. 1 ersichtliche Formgebung auf. Die Strömungsflächen 1e und 1f der Flügel 1a ergeben sich aus dem Schnitt gemäss Fig. 3. Naben und Flügel sind so ausgebildet, dass der Durchfluss der Luft durch das Gehäuse laminar ist und an den Flügeln in radialer Richtung im wesentlichen keine Druckunterschiede auftreten.The hub 2d of the impeller 1 has a flat front surface 1c which lies approximately in one plane with the housing front 2d and the leading edge 1b of the wing. The flow surface 1e of the hub 1d adjoining the surface 1c has the shape shown in FIG. 1. The flow areas 1e and 1f of the vanes 1a result from the section according to FIG. 3. The hubs and vanes are designed such that the flow of air through the housing is laminar and essentially no pressure differences occur on the vanes in the radial direction.

Claims (4)

1. Small fan having a cuboid and flat air-guidance housing (2), in which there is disposed a fan wheel (1) driven by an electric motor (4) and through the end face (2d) of which air enters and through the rear side (2e) of which air is axially discharged, the blades (1a) of the fan wheel (1) not being twisted and being inclined towards the rotational axis of the fan wheel and respectively exhibiting the same angle (a) of attack over the entire depth of the blade, and the electric motor being disposed in the hub (1d) of the fan wheel (1), characterized in that it is a meridian-accelerated fan, in that the flow face (1g) of the hub (1d), which flow face adjoins a front side (2d) of the housing, is convexly configured over the entire depth of the fan wheel (1), such that the flow of air through the air-guidance housing (2) is laminar and essentially no pressure differences arise at the blades (1a) in the radial direction.
2. Small fan according to Claim 1, characterized in that the front edges (1 b) of the fan wheel and the front sides (1 c) of the hub and the front side (2d) of the housing are situated approximately in the same plane.
3. Small fan according to Claim 1 or 2, characterized in that the fan wheel (1) is in one piece and is preferably made from plastic.
4. Small fan according to one of Claims 1 to 3, characterized in that the number of blades (1a) preferably totals three to eleven.
EP90913243A 1989-09-29 1990-09-20 Miniature fan Expired - Lifetime EP0446316B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH354089 1989-09-29
CH3540/89 1989-09-29
CH354089 1989-09-29
PCT/CH1990/000223 WO1991005169A1 (en) 1989-09-29 1990-09-20 Miniature fan

Publications (3)

Publication Number Publication Date
EP0446316A1 EP0446316A1 (en) 1991-09-18
EP0446316B1 true EP0446316B1 (en) 1994-02-02
EP0446316B2 EP0446316B2 (en) 2001-12-05

Family

ID=4258189

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90913243A Expired - Lifetime EP0446316B2 (en) 1989-09-29 1990-09-20 Miniature fan

Country Status (6)

Country Link
US (1) US5217351A (en)
EP (1) EP0446316B2 (en)
JP (1) JP3090216B2 (en)
DE (1) DE59004520D1 (en)
HU (1) HU210777B (en)
WO (1) WO1991005169A1 (en)

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DE4127134B4 (en) * 1991-08-15 2004-07-08 Papst Licensing Gmbh & Co. Kg diagonal fan
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JP2987133B2 (en) * 1997-04-25 1999-12-06 日本電産コパル株式会社 Axial fan and method for manufacturing blade of axial fan and mold for manufacturing blade of axial fan
JP3500292B2 (en) * 1998-01-30 2004-02-23 日本電産コパル株式会社 Axial fan
FR2781843B1 (en) 1998-07-28 2000-10-20 Valeo Thermique Moteur Sa OPTIMIZED COMPACT FAN PROPELLER
FR2812349B1 (en) * 2000-07-31 2003-01-24 Jouan WORKING SPEAKER WITH A PROPELLER FOR MOVING ITS ATMOSPHERE AND CORRESPONDING PROPELLER
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JP2004169680A (en) * 2002-11-18 2004-06-17 Taida Electronic Ind Co Ltd Blade structure and heat radiator using it
FR2864368B1 (en) * 2003-12-19 2006-08-04 Valeo Equip Electr Moteur DEVICE FOR STRENGTHENING THE VENTILATION OF AN ELECTRIC MACHINE AND ELECTRIC MACHINE COMPRISING SUCH A DEVICE
CN100424360C (en) * 2004-02-11 2008-10-08 台达电子工业股份有限公司 Fan and its flabellum assembly
US20070031262A1 (en) * 2005-08-04 2007-02-08 Jinseok Kim Computer cooling fan
TWI292014B (en) * 2005-11-22 2008-01-01 Sunonwealth Electr Mach Ind Co Ultra thin-type fan
TWI293106B (en) * 2005-11-22 2008-02-01 Sunonwealth Electr Mach Ind Co Thin-type fan
TW200732565A (en) * 2006-02-21 2007-09-01 Sunonwealth Electr Mach Ind Co The structure of a small blower
TW200736507A (en) * 2006-03-27 2007-10-01 Sunonwealth Electr Mach Ind Co A thin structure pattern of heat dissipation
TWI349515B (en) * 2006-10-25 2011-09-21 Delta Electronics Inc Fan and fan frame thereof
US20080107366A1 (en) * 2006-11-06 2008-05-08 Zippy Technology Corp. Air fan bearing structure
TWI328080B (en) * 2007-03-30 2010-08-01 Delta Electronics Inc Fan and impeller thereof
JP2008267176A (en) * 2007-04-17 2008-11-06 Sony Corp Axial flow fan device, housing, and electronic equipment
TWI373563B (en) * 2008-06-03 2012-10-01 Sunonwealth Electr Mach Ind Co Brushless dc motor
WO2010028441A1 (en) * 2008-09-11 2010-03-18 Hunter Pacific International Pty Ltd Extraction fan and rotor
US10034411B2 (en) * 2015-09-25 2018-07-24 Apple Inc. Thermal flow assembly including integrated fan

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Also Published As

Publication number Publication date
DE59004520D1 (en) 1994-03-17
US5217351A (en) 1993-06-08
EP0446316A1 (en) 1991-09-18
HUT62375A (en) 1993-04-28
HU210777B (en) 1995-07-28
JPH04502052A (en) 1992-04-09
HU907760D0 (en) 1991-07-29
JP3090216B2 (en) 2000-09-18
EP0446316B2 (en) 2001-12-05
WO1991005169A1 (en) 1991-04-18

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