WO1996019669A1 - Fan - Google Patents
Fan Download PDFInfo
- Publication number
- WO1996019669A1 WO1996019669A1 PCT/NL1995/000433 NL9500433W WO9619669A1 WO 1996019669 A1 WO1996019669 A1 WO 1996019669A1 NL 9500433 W NL9500433 W NL 9500433W WO 9619669 A1 WO9619669 A1 WO 9619669A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fan
- blades
- hub
- skin
- ring
- Prior art date
Links
- 238000006073 displacement reaction Methods 0.000 claims abstract description 4
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 230000006698 induction Effects 0.000 claims description 2
- 230000007423 decrease Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000006261 foam material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002990 reinforced plastic Substances 0.000 description 1
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
- F04D29/26—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
- F04D29/326—Rotors specially for elastic fluids for axial flow pumps for axial flow fans comprising a rotating shroud
-
- 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
- F04D25/066—Linear Motors
-
- 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
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- 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
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
- F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using fans
-
- 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
- F04D29/388—Blades characterised by construction
Definitions
- the invention relates to a fan comprising: a central hub; a plurality of blades connected to this hub and extending at least more or less in radial direction, which blades take a form such that when driven rotatably round the axis of the hub an air displacement occurs; and drive means for rotatably driving the blades with the hub round the axis of the hub.
- the drive means comprise a motor of not inconsiderable diame ⁇ ter, the output shaft of which motor is joined directly to the hub.
- the hub likewise has a not inconsiderable diameter adapted to the diameter of the motor.
- a further significant aspect limiting efficiency is the flow round the ends of the blades, the so-called tips. It would be desirable to eliminate this flow round the tips.
- a further object of the invention is to embody a fan such that a greater flexibility is obtained in respect of the choice of the or each drive motor, wherein the trans- mission between the rotor, comprising hub and blades, and the motor can be designed such that both the rotor and the motor rotate at the most favourable possible rotation speed.
- the invention provides a fan of the stated type which has the feature that the end zones of the blades are connected by a ring, which ring is supported rotatably in a housing; and the drive means comprise a motor which is placed at a distance from the hub outside the air flow generated by the driven blades.
- a specific embodiment is that in which the ring forms part of the drive means.
- This variant can for instance have the special feature that the ring is driven by a motor.
- a specific embodiment has the special feature that the ring is the rotor of an optionally collectorless electric motor.
- a variant of this latter embodiment has the special feature that the rotor is a linear induction motor.
- the fan according to the invention has the special feature that during operation the rotor is suspended magnetically.
- a light but nevertheless mechanically very strong embodiment has the special feature that the blades are connected under bias to the hub and the ring.
- blades each comprise a skin consisting of metal with a thickness of a maximum of 1 mm.
- a particular embodiment has the special feature that the blades each comprise a skin consisting of a plastic layer reinforced with fibres having tensile strength.
- the above two embodiments can have the feature that the skin has a thickness of 0.001-0.03 x the average chord of a blade.
- this latter variant can make use of a very thin skin.
- the fan can then for instance have the special feature that the skin has a thickness of (0.2 ⁇ 0.1) mm.
- the embodiment is recommended in which the skin consists of aluminium or stainless steel.
- the fan can have the special feature that the cavity enclosed by the skin is filled with a filler.
- This latter embodiment can be manufactured in simple manner.
- This variant has the special feature that the filler is modelled beforehand in a mould cavity and the skin is subsequently arranged therearound.
- a still further increase in efficiency can be ob ⁇ tained with an embodiment in which the number of blades amounts to more than four.
- the number of blades can amount for instance to eight or more.
- the average thickness of the blades can for instance be in the order of 15% of the chords. In known designs this thickness is in the order of 2 to 3%.
- the coefficient of resistance c D decreases while the lift coefficient c L can be increased for instance from 0.8 to 1.6.
- the efficiency of the fan is related to the quotient c L /c D .
- the fan efficiency can be increased by these steps to the order of magnitude of 90%. In known designs this efficiency lies in the order of magnitude of a maximum of 50%.
- the decrease of (c ) 0 also contributes to a reduction in the generated sound.
- the blades will taper toward their ends directed toward the ring.
- the torsion of the blades can display at the axis a torsion in the order of 15° as seen in the axial direction of the fan, while the blades can have for instance a torsion in the order of 65° at the tips, i.e. the ends adjoining the ring.
- the latter can have the special feature that at least the inner surface of the ring has an aero ⁇ dynamic form.
- An embodiment which limits noise and increases efficiency is that in which the end zones of the blades connect smoothly onto the inner surface of the ring.
- This embodiment can advantageously display the feature that the end zones have a form widening over the whole periphery with a radius of curvature in the same order of magnitude as the characteristic thickness of the blades.
- a variant in which the blades possess an aerodynamic form with maximized c. I-i/c-,J at a minimized c- U can moreover advantageously have the feature that the blades have a rear edge with a small thickness relative to the aerody ⁇ namic boundary layer during operation of the fan.
- FIG. 1 shows a partly broken away perspective view of a fan according to the invention in a first embodi ⁇ ment
- figure 2 shows a partly broken away perspective view of a second embodiment
- figure 3 shows a partly broken away perspective view of a third embodiment
- figure 4 shows a longitudinal section through a fourth embodiment
- figure 5 shows a partly broken away, partly perspec ⁇ tive view of a part of the fan.
- Figure 1 shows a fan 1 comprising a central hub 2, eight blades 3 connected to this hub 2 and extending at least more or less in radial direction and having a form such that during rotary driving round the axis of hub 2 an air displacement occurs.
- the end zones 4 of blades 3 are mutually joined by a ring 5 which is supported rota ⁇ tably and drivably in a housing 6.
- a motor 7 which drives a drive roller 9 via a transmission 8.
- the roller 9 drives the ring 5 by frictional con ⁇ tact.
- the latter is further supported by two free guide rollers 10,11 which are arranged spring-mounted in hous ⁇ ing 6 for movement away from and toward ring 5.
- the inner surface 12 of ring 5 has a rounded aerody ⁇ namic design.
- FIG. 2 shows a fan 12, the housing 13 of which is adapted to accommodate two rotors 2,3,4,5.
- the motor 7 drives both rotors.
- a toothed belt 15 which is driven by a tooth wheel 14 driven by motor 7 and which co-acts with a pinion 16 arranged round each ring 5.
- Two free-turning tooth wheels 17,18 are mounted fixedly relative to housing 13 and serve for correct positioning of both rotors 2,3,4,5 in combination with the tensile stress in toothed belt 15. Space saving is achieved by using two free-turning deflecting rollers 19,20 whereby the toothed belt engages in substantially horizontal direction on both the upper part and the lower part of the rotors.
- Figure 3 shows a fan 21, the housing 22 of which is rotatably supported by frame 23.
- the housing 22 takes a tubular form and has an aerodynamic form on its inner surface 24.
- a rotor 2,3,4,5 is fixed to this inner sur ⁇ face 24.
- the ring 15 can be used for production purposes. This could also be omitted, particu ⁇ larly in the case where the blades 3 are joined directly, for instance under bias, to inner surface 24.
- a stator winding 27 forming part of the frame 23.
- the housing 22 which, as stated, is rotatable relative to frame 23, carries a crown 28 of magnet means which together with the stator winding 27 form a collectorless electric motor. If de ⁇ sired, this motor can be embodied such that during opera ⁇ tion the housing 22 is suspended electrically.
- Figure 4 shows a fan 29 with a plastic housing 30 and a guard 31 of metal gauze.
- the rotor 2,3,4,5 carries magnets 32 which co-act with a stator winding 33 analogously of the embodiment of figure 3.
- the blades 3 comprise a foam core 34, for instance of plastic such as PUR, with stainless steel skin plates with a thickness in the order of 0.2 mm.
- the wall of housing 30 comprises a plurality of metal rods 36 glued thereto.
- the inner surface of housing 30 has a streamlined form as shown in the top left-hand corner of figure 4. For the sake of a low weight use is made of a foam material filling 37.
- this skin has a thickness which is preferably related to the span width and the chord of these blades.
- FIG. 5 shows in partly broken away perspective view the structure of the fan blades 3.
- Each blade 3 comprises a skin 38 modelled to an aerodynamic form such that blade 3 has a convex surface 39 and a concave sur ⁇ face 40. These surfaces are joined to each other via a bent front edge 41 with relatively small radius of curva- ture.
- the surfaces 39 and 40 mutually overlap. Protruding beyond the overlap zone 43 is that skin part which connects onto the convex surface 39.
- a protruding rear edge 44 consisting of a thin layer corresponding with the thickness of the skin.
- the blade 3 is further filled with foam material 45.
- the end zones of the fan blades connect smoothly onto the inner surface of the ring. These end zones have a form widening over their whole periphery.
- the radius of curva- ture is more or less constant and has a value in the same order of magnitude as the characteristic thickness of the fan blades.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU44015/96A AU4401596A (en) | 1994-12-22 | 1995-12-20 | Fan |
EP95942786A EP0799383A1 (en) | 1994-12-22 | 1995-12-20 | Fan |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL9402191A NL9402191A (en) | 1994-12-22 | 1994-12-22 | Fan. |
NL9402191 | 1994-12-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996019669A1 true WO1996019669A1 (en) | 1996-06-27 |
Family
ID=19865060
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NL1995/000433 WO1996019669A1 (en) | 1994-12-22 | 1995-12-20 | Fan |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0799383A1 (en) |
AU (1) | AU4401596A (en) |
NL (1) | NL9402191A (en) |
TW (1) | TW307815B (en) |
WO (1) | WO1996019669A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU751254B2 (en) * | 2000-08-31 | 2002-08-08 | Carrier Corporation | Motor cooling fan blade assembly with finger guard |
WO2009045108A1 (en) * | 2007-10-04 | 2009-04-09 | Bronswerk Heat Transfer B.V. | Fan |
EP3147510A4 (en) * | 2014-06-25 | 2018-03-14 | Suk Ho Jang | Coreless donut-type motor fan for ventilation and cooling |
EP3759352A1 (en) * | 2017-06-12 | 2021-01-06 | Valeo Systemes Thermiques | Motor vehicle fan |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE128797C (en) * | ||||
US1996195A (en) * | 1933-05-05 | 1935-04-02 | Julian K Ferguson | Electric fan |
FR1568546A (en) * | 1967-09-08 | 1969-05-23 | ||
DE2113019A1 (en) * | 1970-03-19 | 1971-10-14 | Fluor Prod Co Inc | Fan blade and fan impeller assembly |
DE2242218A1 (en) * | 1972-02-28 | 1973-09-06 | United Aircraft Corp | COMPOSITE FAN BLADE AND METHOD FOR MANUFACTURING IT |
DE2211208A1 (en) * | 1972-03-08 | 1973-09-13 | Siemens Ag | DRIVE A FAN WHEEL |
GB2022703A (en) * | 1978-06-09 | 1979-12-19 | Omya Gmbh | Fluid flow machine |
EP0168594A1 (en) * | 1984-06-27 | 1986-01-22 | Canadian Fram Limited | Improved axial fan |
DE3707437A1 (en) * | 1986-03-08 | 1988-03-17 | Hans Joachim Leithner | Impeller for an axial-flow fan |
US4962734A (en) * | 1990-03-14 | 1990-10-16 | Paccar Inc. | Electrically driven, circumferentially supported fan |
EP0524863A1 (en) * | 1991-07-26 | 1993-01-27 | Renault Vehicules Industriels | Fan rotor |
EP0567688A1 (en) * | 1992-04-30 | 1993-11-03 | Götz Heidelberg | Fluid conveying device, particularly a fan |
EP0606054A2 (en) * | 1992-12-28 | 1994-07-13 | Ivan Dipl.-Ing. Sandurkov | Conveying device having an impellor for propelling gases or liquids in a flow channel |
-
1994
- 1994-12-22 NL NL9402191A patent/NL9402191A/en not_active Application Discontinuation
-
1995
- 1995-12-20 EP EP95942786A patent/EP0799383A1/en not_active Withdrawn
- 1995-12-20 AU AU44015/96A patent/AU4401596A/en not_active Abandoned
- 1995-12-20 WO PCT/NL1995/000433 patent/WO1996019669A1/en not_active Application Discontinuation
-
1996
- 1996-02-07 TW TW085101599A patent/TW307815B/zh active
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE128797C (en) * | ||||
US1996195A (en) * | 1933-05-05 | 1935-04-02 | Julian K Ferguson | Electric fan |
FR1568546A (en) * | 1967-09-08 | 1969-05-23 | ||
DE2113019A1 (en) * | 1970-03-19 | 1971-10-14 | Fluor Prod Co Inc | Fan blade and fan impeller assembly |
DE2242218A1 (en) * | 1972-02-28 | 1973-09-06 | United Aircraft Corp | COMPOSITE FAN BLADE AND METHOD FOR MANUFACTURING IT |
DE2211208A1 (en) * | 1972-03-08 | 1973-09-13 | Siemens Ag | DRIVE A FAN WHEEL |
GB2022703A (en) * | 1978-06-09 | 1979-12-19 | Omya Gmbh | Fluid flow machine |
EP0168594A1 (en) * | 1984-06-27 | 1986-01-22 | Canadian Fram Limited | Improved axial fan |
DE3707437A1 (en) * | 1986-03-08 | 1988-03-17 | Hans Joachim Leithner | Impeller for an axial-flow fan |
US4962734A (en) * | 1990-03-14 | 1990-10-16 | Paccar Inc. | Electrically driven, circumferentially supported fan |
EP0524863A1 (en) * | 1991-07-26 | 1993-01-27 | Renault Vehicules Industriels | Fan rotor |
EP0567688A1 (en) * | 1992-04-30 | 1993-11-03 | Götz Heidelberg | Fluid conveying device, particularly a fan |
EP0606054A2 (en) * | 1992-12-28 | 1994-07-13 | Ivan Dipl.-Ing. Sandurkov | Conveying device having an impellor for propelling gases or liquids in a flow channel |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU751254B2 (en) * | 2000-08-31 | 2002-08-08 | Carrier Corporation | Motor cooling fan blade assembly with finger guard |
WO2009045108A1 (en) * | 2007-10-04 | 2009-04-09 | Bronswerk Heat Transfer B.V. | Fan |
NL2002057C2 (en) * | 2007-10-04 | 2009-04-28 | Bronswerk Heat Transfer Bv | Fan. |
US8961109B2 (en) | 2007-10-04 | 2015-02-24 | Bronswerk Heat Transfer B.V. | Fan |
EP3147510A4 (en) * | 2014-06-25 | 2018-03-14 | Suk Ho Jang | Coreless donut-type motor fan for ventilation and cooling |
EP3759352A1 (en) * | 2017-06-12 | 2021-01-06 | Valeo Systemes Thermiques | Motor vehicle fan |
Also Published As
Publication number | Publication date |
---|---|
AU4401596A (en) | 1996-07-10 |
NL9402191A (en) | 1996-08-01 |
TW307815B (en) | 1997-06-11 |
EP0799383A1 (en) | 1997-10-08 |
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