EP0459497B1 - Axiallüfter mit zylindrischem Aussengehäuse - Google Patents

Axiallüfter mit zylindrischem Aussengehäuse Download PDF

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Publication number
EP0459497B1
EP0459497B1 EP91108890A EP91108890A EP0459497B1 EP 0459497 B1 EP0459497 B1 EP 0459497B1 EP 91108890 A EP91108890 A EP 91108890A EP 91108890 A EP91108890 A EP 91108890A EP 0459497 B1 EP0459497 B1 EP 0459497B1
Authority
EP
European Patent Office
Prior art keywords
axial fan
blades
hub
cross
section
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
EP91108890A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0459497A3 (en
EP0459497A2 (de
Inventor
Siegfried Harmsen
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.)
Papst Licensing GmbH and Co KG
Original Assignee
Papst Licensing GmbH and Co KG
Papst Motoren GmbH and Co KG
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 Papst Licensing GmbH and Co KG, Papst Motoren GmbH and Co KG filed Critical Papst Licensing GmbH and Co KG
Publication of EP0459497A2 publication Critical patent/EP0459497A2/de
Publication of EP0459497A3 publication Critical patent/EP0459497A3/de
Application granted granted Critical
Publication of EP0459497B1 publication Critical patent/EP0459497B1/de
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
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S416/00—Fluid reaction surfaces, i.e. impellers
    • Y10S416/02—Formulas of curves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S416/00—Fluid reaction surfaces, i.e. impellers
    • Y10S416/05—Variable camber or chord length

Definitions

  • the invention relates to an axial fan with a substantially cylindrical outer housing and a fan wheel revolving therein, the hub of which sits on the rotor of a centrally arranged electric drive motor, the stator of which is held by webs which extend on the pressure side to the outer housing, and the radially twisted blades of which have a forward curvature with a curvature that changes from the cross section to the outer cross section.
  • axial fans such as are known from DE-A-1964 840, are installed, for example, in personal computers and other electronic devices in order to generate a cooling air flow. Since such devices are often operated at desks and comparable workplaces, the noise development, which is associated with the generation of the cooling air flow plays a considerable role.
  • the task is therefore not only to generate a sufficient volume flow at such a pressure increase which is sufficient to overcome the flow resistance specified by the device construction, but also to cause as little working noise as possible.
  • the need to reduce manufacturing costs has led to the manufacture of both the outer housing and the fan wheel from injection-molded plastic, whereas in the past the outer housing was die-cast from metal and the fan wheel was welded from sheet metal; this in turn has consequences for the design of the fan.
  • the fan wheel of the known fan described at the outset has seven blades, the cross section of which in each circumferential plane from the hub to the outer edge is designed for the same characteristic point - that is, the same volume flow at a certain pressure increase.
  • the wing cross-section in the hub area has a strong curvature and at the same time a large setting angle (against the axis perpendicular); towards the outside, both the curvature and the setting angle decrease.
  • the cross section lengthens in accordance with the increasing scope.
  • this fan was only able to meet the expectations placed on it to a limited extent.
  • the volume flow with free-blowing operation seemed to indicate the generation of sufficient air circulation, the practical use showed realistic Conditions that the pressure increase was not sufficient to maintain the required volume flow even against the resistance at the place of use.
  • the aim of the invention was therefore to design an axial fan of the present type in such a way that, with the greatest possible reduction in operating noise, an increase in pressure is achieved which maintains the required volume flow of air even under installation conditions.
  • the wings in the hub area have a cross section designed for small volume flow and small pressure increase, in the outer area, on the other hand, a cross section designed for higher volume flow and pressure increase values, while the cross-sectional design in the area in between changes continuously and the wings in relatively small change in curvature are also slightly twisted overall.
  • the front and rear edges of the wings are crescent-shaped, the central cross-section preferably having the greatest length. This effect is probably due to the fact that the geometric conditions of the wing itself and its relationship to the webs do not favor the formation of air vibrations of defined frequencies or of beatings.
  • the front edges starting from the hub, initially curve radially and further outward with the direction of rotation, while preferably the rear edges are inclined forward on the hub and are curved outward of the central section against the direction of rotation.
  • the wings are particularly preferably arranged in an odd number on the handle because this eliminates noises which otherwise occur in even-numbered wings due to the even-numbered division of the circumference.
  • the stator of the electric drive motor is also particularly preferably held by an even number of webs on the outer housing, as a result of which the undesired noises can be further reduced.
  • the forward curvature of the wings particularly preferably decreases with increasing distance from the hub, within one wing cross-section, that is to say with constant Distance from the hub, preferably the forward curvature increases towards the rear edge of the wings. It has been shown that such a shape particularly advantageously realizes the radial dependence of the volume flow and the pressure increase according to the invention.
  • the outer housing 1 of the axial fan consists of one piece and has a cylindrical section 2, which is delimited on the end face by molded-on, mutually aligned flange sections 3. In the corner areas of the pressure side, the cylindrical section 2 merges into extensions 4. In these, for example, there are four webs 5, which - parallel to the circumference - run parallel to the radius and open into a central plate 6 which carries the stator (not shown) of the (electric) drive motor. Bores 7 in the corners of the flanges 3 are used to fasten the fan, for example in a monitor housing.
  • the fan wheel designated as a whole by 10, has a hub 11, the diameter of which is substantially equal to the diameter of the plate 6, and which cup-shaped engages over the stator of the electric motor fastened on the plate 6 and is operatively connected to its rotor part.
  • Five fan blades 12, which have the configuration according to the invention, are fastened, for example, to the circumference of the hub 11 - in a known manner not quite evenly distributed.
  • the fan blades 12 with the hub 11 are made in one piece, which is produced by plastic injection molding.
  • FIG. 3 illustrates the different cross-sectional configuration of the blades in radially different circumferential planes (in the opposite direction of rotation; see direction of rotation arrow 8) more clearly than the top view of the middle blade 12 in FIG. 2.
  • the wing 12 attaches to the hub 11 in the hub region.
  • the middle profile shows the cross section 14, and the cross section 15 shown in dashed lines in FIG. 3 illustrates the wing profile on the outer circumference of the fan wheel. It can be seen that both the curvature, namely the greatest distance of the wing inner profile from the edge connector 16 and the setting angle of this edge connector relative to the perpendicular 17 to the axis 18, changes only slightly in the three cross-sectional (circumferential) planes.
  • the curvature has the shape of a forward curvature, which decreases with increasing distance from the hub 11.
  • the forward curvature - viewed in cross section of a wing - increases steadily from the front edge 20 to the rear edge 21.
  • This configuration of the vane 12 is obtained when the radially inner vane profile (in the hub area) is given smaller values for volume flow and pressure increase than the configuration determination of the cross section on the outer diameter; a suitable interpolation takes place in between.
  • FIG. 4 shows the corresponding cross-sectional configurations 13a, 14a and 15a of a wing which has been given the same characteristic values over its entire radial extent.
  • the top view of the impeller 10 in FIG. 1 illustrates the crescent shape of the leading edges 20 and the trailing edges 21 of each blade 12.
  • the leading edges 20 initially run radially outward and then are curved against the direction of rotation, while the trailing edges 21 start tilted backwards on the hub 11 and run outward of the wing center section with the direction of rotation curved.
  • the wing cross section 14 has the greatest length in the central section (FIG. 3).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP91108890A 1990-05-31 1991-05-31 Axiallüfter mit zylindrischem Aussengehäuse Expired - Lifetime EP0459497B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9006174U 1990-05-31
DE9006174U DE9006174U1 (de) 1990-05-31 1990-05-31 Axiallüfter mit zylindrischem Außengehäuse

Publications (3)

Publication Number Publication Date
EP0459497A2 EP0459497A2 (de) 1991-12-04
EP0459497A3 EP0459497A3 (en) 1992-02-26
EP0459497B1 true EP0459497B1 (de) 1994-06-22

Family

ID=6854287

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91108890A Expired - Lifetime EP0459497B1 (de) 1990-05-31 1991-05-31 Axiallüfter mit zylindrischem Aussengehäuse

Country Status (4)

Country Link
US (1) US5184938A (ja)
EP (1) EP0459497B1 (ja)
AT (1) ATE107743T1 (ja)
DE (2) DE9006174U1 (ja)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4127134B4 (de) * 1991-08-15 2004-07-08 Papst Licensing Gmbh & Co. Kg Diagonallüfter
US5393199A (en) * 1992-07-22 1995-02-28 Valeo Thermique Moteur Fan having a blade structure for reducing noise
CH687637A5 (de) * 1993-11-04 1997-01-15 Micronel Ag Axialkleinventilator.
US5616004A (en) * 1995-04-19 1997-04-01 Valeo Thermique Moteur Axial flow fan
US6045327A (en) * 1998-05-04 2000-04-04 Carrier Corporation Axial flow fan assembly and one-piece housing for axial flow fan assembly
US5957661A (en) * 1998-06-16 1999-09-28 Siemens Canada Limited High efficiency to diameter ratio and low weight axial flow fan
US6386830B1 (en) 2001-03-13 2002-05-14 The United States Of America As Represented By The Secretary Of The Navy Quiet and efficient high-pressure fan assembly
US6457941B1 (en) 2001-03-13 2002-10-01 The United States Of America As Represented By The Secretary Of The Navy Fan rotor with construction and safety performance optimization
US6945758B1 (en) * 2002-03-08 2005-09-20 Emerson Electric Co. Drive support and cover assembly for tubeaxial fan
US6702548B1 (en) 2002-03-08 2004-03-09 Emerson Electric Co. Tubeaxial fan assembly
US6722849B1 (en) 2002-03-08 2004-04-20 Emerson Electric Co. Propeller for tubeaxial fan
US7249931B2 (en) * 2002-03-30 2007-07-31 University Of Central Florida Research Foundation, Inc. High efficiency air conditioner condenser fan with performance enhancements
US8647077B2 (en) * 2004-02-20 2014-02-11 Hewlett-Packard Development Company, L.P. Cooling fan for electronic device
DE202008002356U1 (de) * 2008-02-19 2009-06-25 Ebm-Papst Mulfingen Gmbh & Co. Kg Kompaktlüfter
JP2013209956A (ja) * 2012-03-30 2013-10-10 Sanyo Denki Co Ltd 軸流ファン
US10578126B2 (en) 2016-04-26 2020-03-03 Acme Engineering And Manufacturing Corp. Low sound tubeaxial fan
EP3982518A1 (de) * 2020-10-06 2022-04-13 mdGroup Germany GmbH Impeller und verfahren zum montieren eines impellers

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT115470B (de) * 1925-09-21 1929-12-27 Voith J M Fa Laufradschaufel für Kreiselmaschinen.
US1964525A (en) * 1932-07-30 1934-06-26 Gen Electric Fan blade
US2524870A (en) * 1944-11-06 1950-10-10 James Russell Kennedy Screw fan, pump, or other cased or uncased screw wheel
US2578806A (en) * 1949-06-04 1951-12-18 Johnson Lawrence Propeller
GB683012A (en) * 1951-03-06 1952-11-19 Oscar Abraham Wirkkala Improvements in or relating to screw propellers
AT203428B (de) * 1957-01-30 1959-05-11 Ernst Dr Ing Souczek Laufrad für axiale Strömungsmaschinen, insbesondere Wasserturbinen
US3023709A (en) * 1958-05-26 1962-03-06 Kondo Masukichi Vanes of an impeller for axial flow propeller pumps
DE1964890A1 (de) * 1969-12-24 1971-07-01 Papst Motoren Kg Ventilator-Einheit mit Elektronik-Bauteilen
DE2226177A1 (de) * 1972-05-30 1973-12-13 Benzing Ventilatoren Ohg Ventilator, insbesondere zur entlueftung von kleinen raeumen
US4063852A (en) * 1976-01-28 1977-12-20 Torin Corporation Axial flow impeller with improved blade shape
JPS53115911A (en) * 1977-03-19 1978-10-09 Daikin Ind Ltd Axial-flow fan
US4142844A (en) * 1977-05-31 1979-03-06 Allware Agencies Ltd. Fan blade assemblies for box fans
US4358245A (en) * 1980-09-18 1982-11-09 Bolt Beranek And Newman Inc. Low noise fan
US4569631A (en) * 1984-08-06 1986-02-11 Airflow Research And Manufacturing Corp. High strength fan
EP0174487A1 (de) * 1984-08-16 1986-03-19 Siemens Aktiengesellschaft Axialventilator
CH667901A5 (de) * 1985-05-02 1988-11-15 Papst Motoren Gmbh & Co Kg Einbauventilator.
IT206701Z2 (it) * 1985-08-02 1987-10-01 Gate Spa Ventilatore assiale particolarmente per autoveicoli
JP2590514B2 (ja) * 1987-03-13 1997-03-12 日本電装株式会社 送風ファン
DE8705665U1 (de) * 1987-04-16 1987-06-11 Knürr-Mechanik für die Elektronik AG, 8000 München Lüftereinschub

Also Published As

Publication number Publication date
DE9006174U1 (de) 1991-10-10
DE59101986D1 (de) 1994-07-28
EP0459497A3 (en) 1992-02-26
ATE107743T1 (de) 1994-07-15
US5184938A (en) 1993-02-09
EP0459497A2 (de) 1991-12-04

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