US3531221A - Ventilator with axial propeller wheel - Google Patents

Ventilator with axial propeller wheel Download PDF

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Publication number
US3531221A
US3531221A US767878*A US3531221DA US3531221A US 3531221 A US3531221 A US 3531221A US 3531221D A US3531221D A US 3531221DA US 3531221 A US3531221 A US 3531221A
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US
United States
Prior art keywords
blades
ventilator
frame
propeller wheel
air
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
US767878*A
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English (en)
Inventor
Engelbert Herberg
Hermann Papst
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.)
Ebm Papst St Georgen GmbH and Co KG
Original Assignee
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 Motoren GmbH and Co KG filed Critical Papst Motoren GmbH and Co KG
Application granted granted Critical
Publication of US3531221A publication Critical patent/US3531221A/en
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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
    • 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
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/545—Ducts
    • F04D29/547—Ducts having a special shape in order to influence fluid flow

Definitions

  • the present invention relates in general to ventilators and more particularly to ventilators acting as axial blowers. More specifically, the invention relates to ventilators having a flange-shaped frame to which spokes are mounted which carry the stator of the motor, whereas the propeller blades are attached to the rotor. Such ventilators are used for many purposes, especially they are often mounted to the casing of electronic apparatus to move a cooling air stream through the interior of such apparatus.
  • a ventilator in combination, a fan assembly comprising a frame with a passage of circular cross-section, provided with at least one spoke supporting the motor, a guiding wall of said frame surrounding the passing air stream at its periphery, a propeller wheel having blades projecting at the entrance side ofthe air both in axial and radial direction beyond said guiding wall.
  • an axial blower In this embodiment of an axial blower the portion of the propeller wheel which lies in front of the frame has an enlarged diameter so that the propeller wheel can no more be inserted through the aperture of the frame.
  • This arrangement of an axial blower has the unexpected effect that the air drawn into the improved ventilator enters radially from outside along the periphery of the propeller wheel into the aperture of the frame serving for the passage of air.
  • the inventive axial blower offers the great advantage that, compared with the hitherto used blowers, it eliminates almost completely the high noise level which has heretofore been found so objectionable in ventilators of this type.
  • the clear Width of the outer surrounding wall increases at the exhaust side continuously in the direction of the air stream and inserted annular shaped guiding walls subdivide the aperture angle of the exhaust aperture.
  • the propeller Wheel is a bipartite construction, each portion thereof projecting at the entrance side respectively the exhaust side both in radial and in axial direction beyond the aperture of the frame serving for the passage of air.
  • blades of the propeller wheel either at the entrance side or exhaust side, with extensions projecting outwardly in radial direction beyond the aperture of the frame serving for the passage of air.
  • the blades of the propeller Wheel are made of elastic and resilient material, and the propeller wheel is inserted through said aperture of the frame by elastic deformation of the blades.
  • the propeller wheel being located at the exhaust side, as one integral unit and to mount it onto the rotor, whereas the blades, being located at the entrance side, are mounted separately onto the rotor.
  • FIG. 1 is a section through a ventilator according to the present invention, the section line being analogous to that identified by the line AA of FIG. 3;
  • FIG. 2 is a section similar to FIG. 1 but through a further embodiment of the invention.
  • FIG. 3 is a fragmentary axial view of the embodiment shown in FIG. 2;
  • FIG. 4 is a view analogous to that of FIG. 3 but illustrating an additional embodiment of the invention.
  • FIG. 5 is a planview of a fan blade unit with only one fan blade being illustrated
  • FIG. 6 is a view similar to FIG. 5 but illustrating a further embodiment of the invention.
  • FIG. 7 is a fragmentary view analogous to that of FIG. 5 illustrating yet another embodiment of the invention.
  • FIG. 8 is a view similar to FIG. 7 illustrating still a further embodiment of the invention.
  • FIG. 9 is a view similar to FIG. 5 and FIG. 7, illustrating still another embodiment of the invention.
  • FIG. 10 is a view similar to FIG. 9 but illustrating yet a further embodiment of the invention.
  • reference numeral 1 identifies a wall of a casing to which our novel ventilator is to be aflixed and into the interior of which it is to direct a stream of cooling air. It is immaterial, of course, what such a casing contains, whether it be electronic components or anything else.
  • Motor 2 is mounted on the wall of this casing by means of a frame or shroud 3.
  • This frame or shroud 3 is aflixed to the wall 1 via screws 5 which later also serve to secure spacer sleeves or members 4.
  • the spacer sleeves 4 carry, spaced from the wall 1 and the frame 3, supporting arms 7 which are arranged in a spoke-type configuration, and a flange 7.
  • the outer configuration of the frame 3 may be quadratic, if desired, and the motor 2, carried by the aforementioned components, all of which together (with the exception of the casing 1) may be thought of as a housing, is of the exterior-rotor type wherein the rotor 10 surrounds and is rotatable with reference to the stator 8.
  • the stator 8 is carried by the supporting arms 6 and the rotor 10 is mounted on the shaft 9. It carries on its outer surface the fan blades 11.
  • the flow passage FP in the frame 3 is made as large as mechanical strength requirements for the frame 3 will permit.
  • the thin-line arrows indicate the direction of air aspiration, it being evident that air is aspirated both axially and radially inwardly past the supporting arms 6 and the spacer sleeves 4.
  • the fan blades 11 project in this embodiment in part (compare the edge 12) radially as well as axially outwardly beyond the open inlet end of the flow passage, that is the end of the flow passage FP which in FIG. 1 is the right-hand end of the passage through the frame 3.
  • the air in the region of the edges 12 will not be deflected outwardly away from the fan blades 11, but rather will be aspirated radially inwardly over the entire circumference of the fan blade unit constituted by the rotor 10 and the plurality of fan blades 11 affixed thereto, as well as over the entire axial length of the edge 12, that is over the entire length of that portion of each fan blade 11 which projects outwardly beyond the inlet end of the flow passage FP in upstream direction.
  • This results in a significant improvement in the quantity of aspirated air and we have found that if the largest diameter of the fan blade unit is approximately 7% larger than the diameter of the opening of the flow passage, the quantity of aspirated air is increased already by substantially 30%.
  • FIG. 2 illustrates a modification of the mounting of the motor to the casing of an apparatus.
  • the stator 8 of the motor 2 is mounted at the exhaust side of frame 3 together with spokes 6 and flange 7 while the air enters freely without being hindered by the spokes.
  • the frame respectively the ventilator casing together with the spokes can be made of one piece so that the propeller wheel together with the rotor and the shaft is one exchangeable constructional unit, whereas the flange with the stator, the bearing and the frame is another constructional unit.
  • the exhaust aperture there are inserted a funnel-shaped ring 312 and a small number of additional annular-shaped guiding walls 30 which subdivide the aperture angle of the exhaust aperture.
  • FIG. 3 is a front elevation of one part of the ventilator seen in the direction of the axis.
  • Arrow 14 indicates the direction of the rotating blades 11.
  • Arrows 15 indicate the direction of the entering air when the propeller wheel rotates.
  • the leading edges 16 of the blades are inclined by the angle a towards the radial plane 17 laid at the inner end of the blades through the axis.
  • the lines marked with A show the direction of the section shown in FIG. 1.
  • FIG. 4 is a front elevation of one part of another embodiment of the blades.
  • the leading edges 16 of the blades are inclined forwardly to increase the sucking-in effect by an additional scooping effect of the blades, thus increasing the ease with which air is drawn into the improved ventilator.
  • the impact energy losses of the air stream entering radially inwardly at the peripheral surface of the propeller wheel are thus essentially reduced so that the efiiciency of ventilation is greater.
  • FIG. 5 is a side elevation of a propeller wheel according to the embodiment of FIG. 3, whereas FIG. 6 is a side elevation of a propeller wheel according to the embodiment of FIG. 4.
  • FIGS. 5-8 only one blade is shown, the other blades being omitted to simplify the drawings.
  • FIG. 6 illustrates clearly the concave vault of the blade in the region of the leading edge 16.
  • frame 3' is a bipartite construction.
  • the frame can be made as a single unit if, according to FIG. 8, the propeller wheel is a bipartite construction, i.e. in addition to the blades 11 directly attached to the rotor, a small propeller wheel 18 with blades 19 is mounted with small clearance between the blades 11 and 19 when assembling the ventilator.
  • FIG. 9 shows that, where desired or necessary, the blades 11 can be so constructed that the blade unit can be introduced into the flow passage from one open end, With provision being made for the blade to extend not only axially but also radially beyond the respective open ends of the flow passage at both sides.
  • This is accomplished in FIG. 9 by securing discrete portions 20 to the axially projecting portions of the blades 11 at one open end of the flow passage.
  • the portions 20 could be secured to the axially projecting portions of the blades 11 at both open ends of the flow passage.
  • the portions 20 may, incidentally, serve for balancing the fan blade unit in one plane whereas for purposes of balancing in the second plane the rotor may be provided with suitable means for effecting balancing.
  • the frame 3 is of one-piece construction but that the blades 11 extend not only axially but also radially beyond both open ends of the flow passage in the frame 3.
  • the blades 11 in FIG. 10 of resiliently deflectable material, for instance synthetic plastic material which are advantageously provided on a supporting sleeve 21 secured onto the rotor. Installation in the flow passage FF is then accomplished simply by resiliently deflecting the blades 11 until they can be pushed through the flow passage, whereupon they are released and returned to their normal position which is illustrated in FIG. 10.
  • weld the blades 11 directly to the rotor, advantageously to the magnetically active material of the rotor.
  • the blades may be secured to a solid ring or sleeve, to a cup or bell-shaped member, or the like which in turn will be aflixed to the rotor. Uniting of the blades into such a configuration may be accomplished by resorting to soldering, Welding, casting or similar techniques.
  • a ventilator in combination, a housing provided with a guide wall defining a flow passage having an open inlet end and an open outlet end axially spaced from said inlet end, said housing defining upstream of said inlet end of said passage a radially at least substantially unobstructed air intake zone; and a fan assembly comprising a fan blade unit mounted for rotation in part within the confines of said passage and including a plurality of fan blades which project at the inlet end in axial direction beyond said guiding wall and outside said guiding wall in said air intake zone in radial direction freely beyond the diameter of said passage.
  • said fan blades also projecting both in radial and in axial direction beyond the open outlet of said guiding wall.
  • said fan assembly including stator means carried by said housing, and rotor means surrounding and rotatable relative to said stator means; and wherein said fan blades are carried by said rotor means.
  • each of said fan blades consisting of a first and a second discrete portion and said fan blade unit including a hub consisting of two discrete sections one of which carries the first portions and the other of which carries the second portions of said fan blades; and wherein both of said sections are mounted for joint rotation with said first portions in part projecting radially and axially outwardly beyond one of said open ends and said second portions in part projecting radially and axially outwardly beyond the other of said open ends.
  • said fan blades each including a main body portion which projects axially beyond said open inlet end, and an auxiliary body portion fixed with said main body portion exteriorly of said open inlet end and projecting radially of the latter.
  • said fan blades consisting of an elastically deflectable material so as to be insertable into said flow passage through one of said open ends by elastic deflection of the respective blades.
  • said fan blades consisting of synthetic plastic material.
  • said fan blades consisting of synthetic plastic material.
  • said fan blades being at least in the region of their respective leading edges vaulted and provided with a concavity facing the direction of rotation of said fan blade unit so as to constitute a scoop for gaseous fluid.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US767878*A 1967-08-23 1968-08-21 Ventilator with axial propeller wheel Expired - Lifetime US3531221A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1628353 1967-08-23

Publications (1)

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US3531221A true US3531221A (en) 1970-09-29

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US767878*A Expired - Lifetime US3531221A (en) 1967-08-23 1968-08-21 Ventilator with axial propeller wheel

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US (1) US3531221A (en, 2012)
JP (1) JPS4818526B1 (en, 2012)
FR (1) FR1576254A (en, 2012)
GB (1) GB1182847A (en, 2012)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4221546A (en) * 1974-11-18 1980-09-09 Pabst-Motoren Kg Axial fan
DE2940650A1 (de) * 1979-10-06 1981-04-16 Papst-Motoren Kg, 7742 St Georgen Axialventilator
US4460312A (en) * 1980-04-09 1984-07-17 Iem Ltd. Fan unit
US4564335A (en) * 1979-10-06 1986-01-14 Papst-Motoren Gmbh & Co. Kg Axial flow fan
US4618315A (en) * 1981-05-29 1986-10-21 Papst-Motoren Gmbh & Co. Small fan
US4664593A (en) * 1983-04-08 1987-05-12 Aisin Seiki Kabushiki Kaisha Blade configuration for shrouded motor-driven fan
US4712977A (en) * 1984-07-02 1987-12-15 Gerfast Sten R Axial fan
US4895489A (en) * 1986-11-14 1990-01-23 Yasuaki Kohama Axial flow fan
US5028216A (en) * 1982-11-09 1991-07-02 Papst-Motoren Gmbh & Co. Kg Miniaturized direct current fan
EP1211426A3 (de) * 2000-12-01 2003-07-23 Papst-Motoren GmbH & Co. KG Lüftergehäuse, insbesondere für Axiallüfter
US20030202878A1 (en) * 2002-04-30 2003-10-30 Wen-Shi Huang Fan device with increased airflow output
US20050180849A1 (en) * 2004-02-18 2005-08-18 Te-Fu Chen Axial flow fan
US20050191955A1 (en) * 2003-08-19 2005-09-01 Sunonwealth Electric Machine Industry Co., Ltd. Airflow guiding structure varying in inclinations of air-guiding rings for a heat-dissipating fan
US20070154308A1 (en) * 2005-12-30 2007-07-05 Sheng-An Yang Heat-dissipating fan
CN100497952C (zh) * 2004-03-03 2009-06-10 台达电子工业股份有限公司 轴流式风扇
US20100247344A1 (en) * 2006-12-18 2010-09-30 Sheng-An Yang Heat dissipating fan
US20120301277A1 (en) * 2011-05-26 2012-11-29 Chih-Hsiang Chang Fan
US20130052000A1 (en) * 2011-08-29 2013-02-28 Cheng Ming Su Structure of wind direction cover of electric fan
US20130189129A1 (en) * 2012-01-23 2013-07-25 Lasko Holdings, Inc. Low Noise Air Movement Generator
US9945391B2 (en) 2014-03-27 2018-04-17 Trane International Inc. Diffuser collar
US20200232468A1 (en) * 2019-01-18 2020-07-23 Asia Vital Components Co., Ltd. Fan frame structure

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133082B (en) * 1982-11-09 1987-05-13 Papst Motoren Gmbh & Co Kg Miniaturized direct current fan
JP2018159371A (ja) * 2017-03-24 2018-10-11 パナソニックＩｐマネジメント株式会社 送風装置
CN110869618A (zh) * 2017-07-11 2020-03-06 日本电产株式会社 送风装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US921744A (en) * 1908-05-12 1909-05-18 William D Scott Ventilating-fan for mines.
DE424680C (de) * 1924-01-01 1926-02-11 Theodor Froehlich Fa Schraubenventilatoranlage
US2435645A (en) * 1945-08-23 1948-02-10 Westinghouse Electric Corp Axial flow fan
US2936948A (en) * 1954-10-15 1960-05-17 Eck Bruno Christian Axial blower with cone-shaped hub
US3362627B1 (en, 2012) * 1963-01-14 1968-01-09
US3385516A (en) * 1966-03-31 1968-05-28 Gen Electric Fan construction

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US921744A (en) * 1908-05-12 1909-05-18 William D Scott Ventilating-fan for mines.
DE424680C (de) * 1924-01-01 1926-02-11 Theodor Froehlich Fa Schraubenventilatoranlage
US2435645A (en) * 1945-08-23 1948-02-10 Westinghouse Electric Corp Axial flow fan
US2936948A (en) * 1954-10-15 1960-05-17 Eck Bruno Christian Axial blower with cone-shaped hub
US3362627B1 (en, 2012) * 1963-01-14 1968-01-09
US3362627A (en) * 1963-01-14 1968-01-09 Papst Hermann Ventilator
US3385516A (en) * 1966-03-31 1968-05-28 Gen Electric Fan construction

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4221546A (en) * 1974-11-18 1980-09-09 Pabst-Motoren Kg Axial fan
DE2940650A1 (de) * 1979-10-06 1981-04-16 Papst-Motoren Kg, 7742 St Georgen Axialventilator
US4373861A (en) * 1979-10-06 1983-02-15 Papst-Motoren Kg Axial-flow fan
US4564335A (en) * 1979-10-06 1986-01-14 Papst-Motoren Gmbh & Co. Kg Axial flow fan
US4460312A (en) * 1980-04-09 1984-07-17 Iem Ltd. Fan unit
US4618315A (en) * 1981-05-29 1986-10-21 Papst-Motoren Gmbh & Co. Small fan
US5028216A (en) * 1982-11-09 1991-07-02 Papst-Motoren Gmbh & Co. Kg Miniaturized direct current fan
US4664593A (en) * 1983-04-08 1987-05-12 Aisin Seiki Kabushiki Kaisha Blade configuration for shrouded motor-driven fan
US4712977A (en) * 1984-07-02 1987-12-15 Gerfast Sten R Axial fan
US4895489A (en) * 1986-11-14 1990-01-23 Yasuaki Kohama Axial flow fan
US6659719B2 (en) 2000-12-01 2003-12-09 Papst-Motoren Gmbh & Co. Kg Ventilator housing, in particular, for axial ventilators
EP1211426A3 (de) * 2000-12-01 2003-07-23 Papst-Motoren GmbH & Co. KG Lüftergehäuse, insbesondere für Axiallüfter
US6869269B2 (en) * 2002-04-30 2005-03-22 Delta Electronics, Inc. Fan device with increased airflow output
US20030202878A1 (en) * 2002-04-30 2003-10-30 Wen-Shi Huang Fan device with increased airflow output
US7334988B2 (en) * 2003-08-19 2008-02-26 Sunonwealth Electric Machine Industry Co., Ltd. Airflow guiding structure varying in inclinations of air-guiding rings for a heat-dissipating fan
US20050191955A1 (en) * 2003-08-19 2005-09-01 Sunonwealth Electric Machine Industry Co., Ltd. Airflow guiding structure varying in inclinations of air-guiding rings for a heat-dissipating fan
US20050180849A1 (en) * 2004-02-18 2005-08-18 Te-Fu Chen Axial flow fan
US7083387B2 (en) * 2004-02-18 2006-08-01 Delta Electronics Inc. Axial flow fan
CN100497952C (zh) * 2004-03-03 2009-06-10 台达电子工业股份有限公司 轴流式风扇
US20070154308A1 (en) * 2005-12-30 2007-07-05 Sheng-An Yang Heat-dissipating fan
US20100247344A1 (en) * 2006-12-18 2010-09-30 Sheng-An Yang Heat dissipating fan
US20120301277A1 (en) * 2011-05-26 2012-11-29 Chih-Hsiang Chang Fan
US9163640B2 (en) * 2011-05-26 2015-10-20 Delta Electronics, Inc. Fan
US20130052000A1 (en) * 2011-08-29 2013-02-28 Cheng Ming Su Structure of wind direction cover of electric fan
US20130189129A1 (en) * 2012-01-23 2013-07-25 Lasko Holdings, Inc. Low Noise Air Movement Generator
US9945391B2 (en) 2014-03-27 2018-04-17 Trane International Inc. Diffuser collar
US20200232468A1 (en) * 2019-01-18 2020-07-23 Asia Vital Components Co., Ltd. Fan frame structure

Also Published As

Publication number Publication date
GB1182847A (en) 1970-03-04
FR1576254A (en, 2012) 1969-07-25
JPS4818526B1 (en, 2012) 1973-06-06

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