US3431978A - Propeller fan - Google Patents

Propeller fan Download PDF

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Publication number
US3431978A
US3431978A US638517A US3431978DA US3431978A US 3431978 A US3431978 A US 3431978A US 638517 A US638517 A US 638517A US 3431978D A US3431978D A US 3431978DA US 3431978 A US3431978 A US 3431978A
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US
United States
Prior art keywords
blades
rotor
laminations
fan
heat
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
US638517A
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English (en)
Inventor
Georg Friedrich Papst
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Individual
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Individual
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Publication of US3431978A publication Critical patent/US3431978A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
    • F04D25/064—Details of the rotor
    • 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
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • 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
    • F04D29/34—Blade mountings

Definitions

  • the present invention relates to propeller fans. More particularly, the invention relates to improvements in propeller fans wherein the rotor preferably accommodates the stator. Still more particularly, the invention relates to improvements in propeller fans which may be utilized for ventilation and efficient withdrawal of heat from electrical apparatus, for example, for cooling of apparatus which are used in the field of communications.
  • propeller fans are not entirely satisfactory, mainly because they do not embody an efiicient system for preventing overheating of their motors.
  • heat developing in the rotor when the fan is in use cannot be dissipated without resorting to bulky, costly and complicated ventilating systems which often necessitate such increases in dimensions of the fans that they cannot be fitted into relatively small areas which are available therefor in electrical or electronic equipment.
  • many presently known propeller fans are provided with cylinders of plastic or metallic material which are fitted onto the rotor and carry plastic or metallic blades. Such cylinders form barriers which prevent rapid exchange of heat between the rotor and the surrounding air even if the cylinders consist of metallic material.
  • Another object of the invention is to provide a propeller fan wherein the rotor can exchange heat directly with the blades.
  • a further object of the invention is to provide a propeller fan which can be constructed at a cost which is less than the cost of presently known propeller fans.
  • a concomitant object of the invention is to provide a novel method of producing a propeller fan.
  • An ancillary object of the invention is to provide a 3,431,978 Patented Mar. 11, 1969 method of insuring satisfactory exchange of heat between the rotor and the blades of a propeller fan.
  • Another object of the invention is to provide a method according to which a propeller fan can be assembled of fewer component parts than presently known propeller fans without adversely affecting the cooling of the rotor.
  • a further object of the invention is to provide a propeller fan which can be produced and assembled at a cost which is less than the cost involved in the manufacture of conventional propeller fans.
  • One feature of my invention resides in the provision of a method of producing a propeller fan of the type wherein the rotor surrounds the stator.
  • the method comprises the steps of producing the fan blades of metallic material and of connecting such blades directly to the laminations of the rotor so that the blades exchange heat with the rotor and dissipate such heat into the surrounding atmosphere when the fan is in use.
  • the step of connecting the blades to the laminations of the rotor is preferably carried out by resistance welding and while the blades are pressed against the external surfaces of laminations with a considerable force, preferably with a force which causes slight penetration of blades into the laminations.
  • One electrode of the resistance welding apparatus can be used to press a blade against the laminations and the other electrode can be applied against the internal or external surfaces of the laminations. Such surfaces are preferably finished to a high degree of smoothness, for example, by turning, and are preferably of cylindrical outline.
  • Each blade is preferably bonded to each lamination 0f the rotor.
  • FIG. 1 is a fragmentary partly elevational and partly sectional view of a conventional propeller fan
  • FIG. 2 is a partly elevational and partly sectional view of a propeller fan which is constructed and assembled in accordance with a first embodiment of my invention
  • FIG. 3 is a similar view of a second propeller fan with paddle-like blades.
  • FIG. 4 is a similar view of a third propeller fan with V-shaped blades.
  • FIG. 1 illustrates a portion of a conventional propeller fan.
  • the motor of the fan comprises a rotor 1' having a package of laminations 4 and being surrounded by a substantially cylindrical casing 2 of synthetic plastic material.
  • the casing 2 is provided with blades 3, i.e., these blades also consist of synthetic plastic material and are integral with the casing.
  • the bearing of the rotor 1' is shown at 5', and this rotor surrounds the stator (not shown).
  • FIG. 2 illustrates a propeller fan which is constructed and assembled in accordance with one embodiment of the present invention.
  • the fan comprises a substantially cylindrical shell or shroud 7 which surrounds curved metallic blades 13 and the rotor 1 of an electric motor.
  • the laminations 8 of the stator are flanked by windings 9 and the entire stator is surrounded by the rotor 1.
  • the blades 13 are welded to the laminations 4 of the rotor 1 in such a way that the inner edge face of each blade 13 is in heatconducting contact with each lamination of the rotor.
  • FIG. 3 shows a propeller fan which is constructed in accordance with a second embodiment of the present invention.
  • the blades 16 consist of sheet metal and resemble the vanes of a paddle wheel. These blades are produced by stamping and are welded directly to the laminations 4 of the rotor which surrounds the stator in the same way as shown in FIG. 2. Each blade 14 is further Welded to at least one of the rotor rings.
  • the fan of FIG. 4 comprises blades 15 of V-shaped profile.
  • the inner edge faces of these blades are welded to the laminations 4 of the rotor.
  • An advantage of the blades 15 is that they can draw air at both ends of the shroud, i.e., the efficiency of the fan is higher.
  • the blades 15 are welded only to the external surfaces of the laminations 4.
  • the blades 13, 14 or 15 are preferably secured to the laminations 4 and to the ring 1a and/or 1b of the rotor by resistance welding. Such welding is carried out while the inner edge faces of the blades are pressed against the rotor with a considerable force so that the innermost portions of the blades penetrate into the external surfaces of the laminations 4. During welding, the blades are melted or fused into the laminations to form therewith an integral unit.
  • the laminations 4 are stacked upon each other to form a compact package.
  • the blades 13, 14 or 15 perform the dual function of circulating air in the area surrounding the fan and of conveying heat from the rotor. Such heat is dissipated while the blades exchange heat with surrounding air.
  • the area of heat exchange between the rotor (blades 13, 14 or 15) and the surrounding air is greater than in heretofore known motors for propeller fans.
  • one electrode of the resistance welding apparatus can be used to press a blade 13, 14 or 15 against the external surfaces of the laminations 4 with a force which suffices to insure that the inner edge face of the blade is in satisfactory contact with each lamination.
  • the other electrode is connected with the package in such a way that it remains in direct current-conducting engagement with the majority of or with all laminations 4.
  • the second electrode can be placed and pressed against the external surfaces of laminations 4 in immediate or close proximity of the blade which is in the process of being bonded to the rotor.
  • the internal surface 1c surrounding the bore in the rotor 1 can be placed onto one electrode while the other electrode presses a blade against the external surfaces of the laminations. It is preferred to finish the internal and/ or external surfaces of laminations 4 by resorting to a precision finishing tool, for example, in a suitable turning machine.
  • a propeller fan comprising a motor having a stator and a rotor, said rotor comprising laminations having exposed external surfaces which together define a composite annular peripheral surface exposed to the ambient atmosphere; and a plurality of discrete blades respectively directly afiixed to circumferentially spaced portions of said peripheral surface so that the latter is unobstructed intermediate said portions, said blades consisting at least in part of heat-conducting material to withdraw heat from the rotor when the latter rotates.
  • a method of producing a propeller fan of the type wherein the blades are disposed around the rotor of the fan motor and wherein the rotor comprises metallic laminations having external surfaces comprising the steps of making the blades of metallic material; and resistance welding the blades directly to the external surfaces of at least some laminations so that the blades exchange heat directly with such laminations when the fan is in operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Manufacture Of Motors, Generators (AREA)
US638517A 1967-03-16 1967-05-15 Propeller fan Expired - Lifetime US3431978A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP0041652 1967-03-16

Publications (1)

Publication Number Publication Date
US3431978A true US3431978A (en) 1969-03-11

Family

ID=7377991

Family Applications (1)

Application Number Title Priority Date Filing Date
US638517A Expired - Lifetime US3431978A (en) 1967-03-16 1967-05-15 Propeller fan

Country Status (5)

Country Link
US (1) US3431978A (ja)
JP (2) JPS5025165B1 (ja)
DE (1) DE1628349B2 (ja)
FR (1) FR1565571A (ja)
GB (1) GB1210141A (ja)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3597117A (en) * 1969-01-10 1971-08-03 Rotorn Inc Fan for narrow environments
JPS50134946U (ja) * 1974-04-20 1975-11-06
US4686399A (en) * 1983-10-25 1987-08-11 Mitsubishi Denki Kabushiki Kaisha Rotor for rotary electrical machines
US5028216A (en) * 1982-11-09 1991-07-02 Papst-Motoren Gmbh & Co. Kg Miniaturized direct current fan
ES2190291A1 (es) * 1999-06-15 2003-07-16 Soler & Palau Disposicion aplicable a motores electricos anulares para el montaje de rodetes centrifugos
US20040108775A1 (en) * 2001-03-02 2004-06-10 Thomas Bilsing Electric machine
US20080075598A1 (en) * 2004-02-03 2008-03-27 Te-Fu Chen Fan assembly and impeller thereof
US11240931B1 (en) * 2020-07-16 2022-02-01 Dell Products, Lp Variable height fan

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2555671C2 (de) * 1974-12-13 1986-06-26 Papst-Motoren GmbH & Co KG, 7742 St Georgen Elektromotor
JPS53115459U (ja) * 1977-02-22 1978-09-13
DE2940650A1 (de) * 1979-10-06 1981-04-16 Papst-Motoren Kg, 7742 St Georgen Axialventilator
CH654455A5 (de) * 1980-05-10 1986-02-14 Papst Motoren Gmbh & Co Kg Buerstenlose gleichstrommotoranordnung, insbesondere fuer magnetplattenantriebe.
GB2133082B (en) * 1982-11-09 1987-05-13 Papst Motoren Gmbh & Co Kg Miniaturized direct current fan
JPS58203379A (ja) * 1983-02-10 1983-11-26 株式会社日立製作所 冷蔵庫
JPS6141886U (ja) * 1984-08-21 1986-03-17 株式会社 日本計器製作所 フアン・モ−タ
DE50012631D1 (de) * 1999-06-30 2006-07-13 Uwe Stadtmueller Verfahren und Vorrichtung zum Befestigen von Luftleitflügeln
JP4935048B2 (ja) * 2005-10-27 2012-05-23 日本電産株式会社 遠心ファン

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2495895A (en) * 1945-10-31 1950-01-31 Universal Oil Prod Co Fluid circulating device
US2742223A (en) * 1952-12-13 1956-04-17 Font Eduardo Soler Electric propeller fans and the like
DE1031929B (de) * 1954-02-08 1958-06-12 Eduardo Soler Font Ventilator mit Antrieb durch Elektromotor mit Aussenlaeufer
DE973853C (de) * 1951-04-08 1960-06-30 Wolfgang Schaefer Durch einen Elektromotor angetriebener Schraubenluefter
US3077297A (en) * 1960-10-24 1963-02-12 Stalker Corp Bladed rotors

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2495895A (en) * 1945-10-31 1950-01-31 Universal Oil Prod Co Fluid circulating device
DE973853C (de) * 1951-04-08 1960-06-30 Wolfgang Schaefer Durch einen Elektromotor angetriebener Schraubenluefter
US2742223A (en) * 1952-12-13 1956-04-17 Font Eduardo Soler Electric propeller fans and the like
DE1031929B (de) * 1954-02-08 1958-06-12 Eduardo Soler Font Ventilator mit Antrieb durch Elektromotor mit Aussenlaeufer
US3077297A (en) * 1960-10-24 1963-02-12 Stalker Corp Bladed rotors

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3597117A (en) * 1969-01-10 1971-08-03 Rotorn Inc Fan for narrow environments
JPS50134946U (ja) * 1974-04-20 1975-11-06
JPS5439325Y2 (ja) * 1974-04-20 1979-11-21
US5028216A (en) * 1982-11-09 1991-07-02 Papst-Motoren Gmbh & Co. Kg Miniaturized direct current fan
US4686399A (en) * 1983-10-25 1987-08-11 Mitsubishi Denki Kabushiki Kaisha Rotor for rotary electrical machines
ES2190291A1 (es) * 1999-06-15 2003-07-16 Soler & Palau Disposicion aplicable a motores electricos anulares para el montaje de rodetes centrifugos
US20040108775A1 (en) * 2001-03-02 2004-06-10 Thomas Bilsing Electric machine
US6841901B2 (en) 2001-03-02 2005-01-11 Robert Bosch Gmbh Electric machine
US20080075598A1 (en) * 2004-02-03 2008-03-27 Te-Fu Chen Fan assembly and impeller thereof
US11240931B1 (en) * 2020-07-16 2022-02-01 Dell Products, Lp Variable height fan

Also Published As

Publication number Publication date
DE1628349A1 (de) 1971-05-27
DE1628349B2 (de) 1971-11-25
GB1210141A (en) 1970-10-28
FR1565571A (ja) 1969-05-02
JPS5025165B1 (ja) 1975-08-21
JPS5656999A (en) 1981-05-19

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