WO1980000475A1 - Ventilateur a flux axial - Google Patents

Ventilateur a flux axial Download PDF

Info

Publication number
WO1980000475A1
WO1980000475A1 PCT/GB1979/000104 GB7900104W WO8000475A1 WO 1980000475 A1 WO1980000475 A1 WO 1980000475A1 GB 7900104 W GB7900104 W GB 7900104W WO 8000475 A1 WO8000475 A1 WO 8000475A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
axial flow
impeller
flow fan
blades
Prior art date
Application number
PCT/GB1979/000104
Other languages
English (en)
Inventor
T Smith
Original Assignee
Colchester Woods
T Smith
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 Colchester Woods, T Smith filed Critical Colchester Woods
Publication of WO1980000475A1 publication Critical patent/WO1980000475A1/fr

Links

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
    • F04D29/38—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
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow fans
    • F04D19/005—Axial flow fans reversible fans

Definitions

  • This invention relates to axial flow fans and to impellers therefor.
  • An object of the present invention is to provide a form of impeller blade for a reversible axial flow fan which can operate in either direction to provide a substantially equal but opposite flow of air with a higher efficiency and consequently a lower power consumption than can be obtained with existing forms of fan having conventional blade configurations.
  • each impeller blade has two aerofoil shaped surfaces reversed with respect to each other so that their leading edges are at opposite edges of the blades, with the leading edge of each aerofoil surface arranged so that when the impeller is rotated in the direction in which said edge provides the leading edge of the blade, the surface lies on the suction side of the blade.
  • the opposite surfaces of the blade Preferably in each transverse section of the blade, the opposite surfaces of the blade have equal but oppositely disposed profiles, although the blade profile may vary along the length of the blade.
  • the pitch of the blades may be adjustable for providing a degree of control over the rate at which air is driven by the impeller at its operating speed.
  • the blade pitch could be constant along the length of the blades it will, in general, decrease towards the tips of the blades to provide a generally uniform airflow over the area swept by the blades.
  • Figure 1 represents diagrammatically a side view of the fan
  • Figures 2and 3 shows sections through a blade of the fan impeller at different distances from the axis of rotation of the impeller.
  • the fan comprises an impeller consisting of a hub 1 carrying a plurality of radially extending blades 2 uniformly spaced around it, the hub being fixed to the shaft 3 of a reversible electric driving motor 4 and the assembly being mounted coaxially within a short hollow cylindrical casing 5 carrying means (not shown) for securing the fan to a supporting structure such as the roof of a road or railway tunnel, with the axis of rotation of the impeller generally parallel to the tunnel axis.
  • air may be required to be driven along the tunnel in either direction and this is achieved by causing the motor 4 to rotate the impeller in one direction or the other.
  • each blade has two identical aerofoil shaped surfaces reversed with respect to each other so that their leading edges are at opposite edges of the blade, each aerofoil surface being arranged so that when the impeller is rotated in the direction in which a leading edge of the surface corresponds to the leading edge of the blade, the surface provides the suction surface of the blade as indicated in Figures 2 and 3, which represent sections through a typical blade at two positions disposed nearer and further respectively from the inner end of the blade.
  • the pitch of the blade reduces towards its outer end in known manner.
  • the surface b has the same profile as the corresponding surface a but the blade station distances are measured from Datum B, all dimensions being in millimetres.
  • the blade profile is not constant along the length of the blade, the chord length and the blade width becoming smaller towards the blade tip.
  • an axial flow impeller having blades of the form described operates at high efficiency with low power consumption when driven in either direction, compared with an impeller equipped with blades of conventional aerofoil sections but arranged alternately 180° to each other, or with symmetrically streamlined non-aerofoil shaped blades.
  • the blades may be adjustable about respective radial axes relative to the hub to enable the blade pitch to be varied and provide a degree of control over the flow rate at the operating speed of the impeller. Any convenient means of adjustment may be provided.
  • the invention includes within its scope not only reversible axial flow fans and impellers therefor constructed as described, but also individual blades having both surfaces of aerofoil shape, but reversed with respect to each other, for use in such fans and impellers.

Landscapes

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

Abstract

Dans un ventilateur a flux reversible chaque pale de l'helice comprend deux surfaces portantes inversees l'une par rapport l a l'autre, le bord d'attaque de chaque surface portante etant dispose de facon telle que lorsque l'helice est mise en rotation dans la direction vers laquelle ce bord constitue le bord d'attaque de cette lame, la surface est positionnee sur le cote aspiration de la pale.
PCT/GB1979/000104 1978-08-16 1979-06-22 Ventilateur a flux axial WO1980000475A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7833611 1978-08-16
GB7833611 1978-08-16

Publications (1)

Publication Number Publication Date
WO1980000475A1 true WO1980000475A1 (fr) 1980-03-20

Family

ID=10499104

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1979/000104 WO1980000475A1 (fr) 1978-08-16 1979-06-22 Ventilateur a flux axial

Country Status (2)

Country Link
EP (1) EP0016044A1 (fr)
WO (1) WO1980000475A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0467336A2 (fr) * 1990-07-18 1992-01-22 Fuji Electric Co., Ltd. Ventilateur axial bidirectionnel
EP1486650A1 (fr) * 2003-06-11 2004-12-15 Bayerische Motoren Werke Aktiengesellschaft Dispositif de refroidissement pour un véhicule automobile
EP3789617A1 (fr) * 2019-09-03 2021-03-10 Ziehl-Abegg Se Ventilateur

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB485041A (en) * 1937-03-25 1938-05-13 Philip Gregson Improvements in and relating to screw fans
US2609055A (en) * 1949-11-08 1952-09-02 Hartzell Propeller Fan Company Reversible propeller blade
US2611533A (en) * 1949-11-08 1952-09-23 Hartzell Propeller Fan Company Reversible fan and delivery tube
US2663494A (en) * 1950-09-06 1953-12-22 Earl Haubrich Electric fan
FR1532853A (fr) * 1967-07-26 1968-07-12 Westinghouse Electric Corp Ventilateur à écoulement axial réversible

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB485041A (en) * 1937-03-25 1938-05-13 Philip Gregson Improvements in and relating to screw fans
US2609055A (en) * 1949-11-08 1952-09-02 Hartzell Propeller Fan Company Reversible propeller blade
US2611533A (en) * 1949-11-08 1952-09-23 Hartzell Propeller Fan Company Reversible fan and delivery tube
US2663494A (en) * 1950-09-06 1953-12-22 Earl Haubrich Electric fan
FR1532853A (fr) * 1967-07-26 1968-07-12 Westinghouse Electric Corp Ventilateur à écoulement axial réversible

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0467336A2 (fr) * 1990-07-18 1992-01-22 Fuji Electric Co., Ltd. Ventilateur axial bidirectionnel
EP0467336A3 (en) * 1990-07-18 1992-04-15 Fuji Electric Co., Ltd. Bi-directional axial-flow blower
EP1486650A1 (fr) * 2003-06-11 2004-12-15 Bayerische Motoren Werke Aktiengesellschaft Dispositif de refroidissement pour un véhicule automobile
EP3789617A1 (fr) * 2019-09-03 2021-03-10 Ziehl-Abegg Se Ventilateur

Also Published As

Publication number Publication date
EP0016044A1 (fr) 1980-10-01

Similar Documents

Publication Publication Date Title
US5437541A (en) Blade for axial fan
US2157999A (en) Ventilating fan
US4086026A (en) Windmill with radial vanes
CA2224204A1 (fr) Ventilateur axial a bruit reduit et a haut rendement
GB1266585A (fr)
US1997506A (en) Guide vane for rotary machines
US4093402A (en) Propeller or a set of wings for a wind mill
EP0933534A3 (fr) Ventilateur axial
US6733241B2 (en) High efficiency ceiling fan
US7413410B2 (en) Ceiling fan blade
US4483659A (en) Axial flow impeller
US2609055A (en) Reversible propeller blade
US4081221A (en) Tripod bladed wind turbine
US3178099A (en) Under-body ventilating fan units
GB1112058A (en) Variable-configuration turbo machine blades
WO2004072473A1 (fr) Turbine hydraulique ou eolienne a axe vertical
WO1980000475A1 (fr) Ventilateur a flux axial
RU2264560C2 (ru) Осевой вентилятор с реверсированием направления потока
FR2288877A1 (fr) Helice autoregulatrice et machine eolienne
US7131819B2 (en) High efficiency ceiling fan
CA1198681A (fr) Roue a debit axial
US2040452A (en) Fan construction
CN219711860U (zh) 离心风轮、离心风机及空调系统
JPS61500926A (ja) 風回転体部材
KR100852950B1 (ko) 축류팬의 블레이드 구조

Legal Events

Date Code Title Description
AK Designated states

Designated state(s): DK GB US

AL Designated countries for regional patents

Designated state(s): DE FR SE