EP0492770A1 - Lüfter - Google Patents

Lüfter Download PDF

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Publication number
EP0492770A1
EP0492770A1 EP91308260A EP91308260A EP0492770A1 EP 0492770 A1 EP0492770 A1 EP 0492770A1 EP 91308260 A EP91308260 A EP 91308260A EP 91308260 A EP91308260 A EP 91308260A EP 0492770 A1 EP0492770 A1 EP 0492770A1
Authority
EP
European Patent Office
Prior art keywords
rotor
fan
radially outer
diffuser
rotation axis
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.)
Withdrawn
Application number
EP91308260A
Other languages
English (en)
French (fr)
Inventor
Macolm Peter Dunphy
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.)
DUNPHY COMBUSTION Ltd
Original Assignee
DUNPHY COMBUSTION Ltd
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 DUNPHY COMBUSTION Ltd filed Critical DUNPHY COMBUSTION Ltd
Publication of EP0492770A1 publication Critical patent/EP0492770A1/de
Withdrawn legal-status Critical Current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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F04D17/165—Axial entry and discharge
    • 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
    • F04D29/30—Vanes

Definitions

  • the present invention relates to a fan and in particular to a fan which is suitable for use in delivering air to a fossil fuel combustion apparatus such as an oil or gas fired boiler.
  • Fans for delivering combustion air to gas and oil fired boilers are well known.
  • Typical such fans incorporate a housing defining an inlet open to the atmosphere and an outlet connected to a burner head.
  • a rotor is mounted within the housing between the inlet and outlet so as to be rotatable about a predetermined axis which extends through the inlet and outlet.
  • the rotor defines passageways extending radially relative to the axis and is driven by a motor such that air is drawn in through the inlet and blown radially outwards through the passageways defined by the rotor.
  • a chamber defined by the housing extends around the circumference of the rotor and air is conveyed from that chamber through a diffuser mounted within the housing between the rotor and the outlet.
  • the diffuser defines passageways extending radially relative to the axis of rotation from the chamber towards the outlet.
  • the diffuser comprises a plurality of curved vane, radially extending edges of the vane being distributed around the diffuser facing the
  • the air within the chamber is caused to rotate in the circumferential direction as a result of the rotation of the rotor.
  • This rotating body of air thus has a substantial component of velocity perpendicular to the radially extending edges of the vane which face the chamber.
  • air which is pushed into the passageways defined by the diffuser is forced to change its direction of movement abruptly as it is displaced in the axial direction into the diffuser passageways.
  • the fan is relatively noisy in operation and inefficient as a result of energy being wasted due to the rapid change in direction of motion of the entrained air.
  • a fan comprising a housing defining an inlet and an outlet, a rotor mounted within the housing between the inlet and outlet, the rotor being rotatable about a predetermined axis and defining passageways extending radially relative to the axis, a motor for rotating the rotor about the predetermined axis, a chamber defined by the housing and extending around the circumference of the rotor, and a diffuser mounted within the housing between the rotor and the outlet, the diffuser defining passageways extending radially relative to the axis from the chamber towards the outlet, wherein the chamber extends around the circumference of the diffuser such that the radially outer ends of the passageways defined by the diffuser open into the chamber in the radial direction.
  • the rotor comprises a plurality of blades, for example twelve, the radially outer edges of which extend parallel to the rotation axis.
  • Each blade may be curved, having a radius of curvature of, for example, 9cm, with any section through the blade parallel to the rotation axis being straight.
  • the direction of curvature of each blade is preferably arranged such that its radially outer edge is swept back relative to the direction of movement of the rotor.
  • the diffuser comprises a plurality of vanes, for example twenty, the radially outer edges of the vanes extending parallel to the rotation axis.
  • the radially outer edges of the vanes may be located at the same radial distance from the rotation axis as the radially outer edges of the rotor blades.
  • Each vane may be curved, having a radius of for example 9cm, with any section through the vane parallel to the rotation axis being straight.
  • the direction of curvature of each vane is preferably arranged such that its radially outer edge is swept forward relative to the direction of movement of the rotor.
  • the body of air rotating within the chamber does not have to change direction abruptly as it enters the radially outer ends of the passageways defined by the diffuser.
  • noise output is substantially reduced and efficiency is enhanced.
  • the air delivered by the fan is not heated to the same extent as is the case with prior art devices and thus the fan can deliver a greater mass of air than would be the case in a less efficient fan.
  • the motor is located so as to be symmetrical about the rotation axis within the inlet. This enables the flow of air through the inlet to cool the motor and in addition provides a compact overall structure.
  • the fan may be used with any device such as a gas, oil or multi-fuel combustion unit which requires an efficient means for delivering air.
  • the invention also provides a rotor for a fan comprising a plurality of blades the radially inner edges of which are tapered towards the rotation axis.
  • Each blade may be curved, having a radius of curvature of for example 9cm with any section through the blade parallel to the rotation axis being straight.
  • the direction of curvature of each blade is preferably arranged such that its radially outer edge is swept back relative to the direction of movement of the rotor.
  • the blades may be formed from strips of material secured between a pair of plates.
  • a line drawn to the radially outer edge of the blade from its centre of curvature subtends an angle of 30° with a radial line drawn from the centre of rotation of the rotor.
  • the illustrated embodiment of the invention comprises a housing 1 defining an inlet 2 to which air gains access through a side aperture 3, and an outlet 4.
  • a motor 5 is located within the inlet 2 and drives a rotor comprising a backplate 6 and a shroud 7.
  • a diffuser defined by a series of vanes 8 is fixed within the housing and a chamber 9 extends around the circumference of both the rotor and the diffuser.
  • Fig. 2 illustrates the rotor structure in greater detail.
  • the backplate 6 defines a central aperture 10 through which a spindle of the motor 5 extends.
  • the backplate 6 is secured so as to rotate with the spindle as illustrated in Fig. 1.
  • the radially inner edge of the shroud 7 is curved towards the inlet 2 so as to define with a frusto-conical member 11 secured within the inlet 2 an air flow passageway.
  • Twelve blades 12 are secured between the backplate 6 and the shroud 7 so as to define twelve radially extending passageways.
  • Each of the blades 12 is formed from a flat strip of metal having castellated edges as shown in Fig. 3.
  • the projections on the castellated edges are inserted through apertures (not shown) in the backplate 6 and the shroud 7 and secured in position by suitable deformation.
  • the rotor assembly turns in the clockwise direction and thus the outer edges of the blades are swept back relative to the direction of rotation of the rotor.
  • the radially outer edges of the blades 12 extend parallel to the rotation axis of the rotor and any section taken through any one blade in a direction parallel to the rotor axis is straight.
  • the individual passageways defined between adjacent pairs of blades are of substantially rectangular cross-section.
  • the radius of curvature of the blades 12 is approximately 9cm and a line drawn to the radially outer edge of the blade from its centre of curvature subtends an angle of 30° with a radial line drawn from the centre of rotation of the rotor through that radially outer edge.
  • each vane 8 is formed as a casting on the housing, for example twenty diffuser vanes being provided to define twenty radially extending passageways. It will be appreciated however that the vanes could be formed other than by cutting, for example by fabrication.
  • Each vane is curved having a radius of curvature of, for example 9cm, disposed such that any section through a vane taken parallel to the axis of rotation is substantially straight.
  • the radially outer edges of the vanes 8 are swept forward relative to the direction of rotation of the rotor and thus a body of air within the chamber 9 which is caused to rotate as a result of rotation of the rotor travels in the direction of the arrow 13 in Fig. 4.
  • the chamber 9 extends circumferentially around the diffuser.
  • the individual vanes 8 extended radially outwards into contact with the radially inner surface of the housing and thus radially extending vane edges were defined adjacent the chamber surrounding the rotor.
  • Such an arrangement caused air entering the diffuser passageways to change direction abruptly.
  • the direction of flow of air changes relatively slowly as it enters the passageway defined between the vanes 8. Thus relatively little energy is lost and noise and unwanted heating is substantially reduced.
  • a plate 14 is secured to the axial edges of the diffuser vanes 8 so as to separate the passageways defined between the vanes 8 from the backplate 6 of the rotor.
  • air blown radially outwards by the rotor into the chamber 9 is then directed radially inwards through the passageways defined between the vanes 8 into the outlet 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP91308260A 1990-12-20 1991-09-10 Lüfter Withdrawn EP0492770A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9027592 1990-12-20
GB9027592A GB2251035A (en) 1990-12-20 1990-12-20 Centrifugal fan

Publications (1)

Publication Number Publication Date
EP0492770A1 true EP0492770A1 (de) 1992-07-01

Family

ID=10687289

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91308260A Withdrawn EP0492770A1 (de) 1990-12-20 1991-09-10 Lüfter

Country Status (4)

Country Link
EP (1) EP0492770A1 (de)
KR (1) KR920012760A (de)
DE (2) DE4130901A1 (de)
GB (1) GB2251035A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1318311A2 (de) * 1998-08-13 2003-06-11 CHAFFEE, Robert B. Batteriegespeistes Gerät
CN100395455C (zh) * 2002-01-21 2008-06-18 株式会社荏原制作所 叶轮及具有该叶轮的多级泵
KR101145790B1 (ko) 2009-03-04 2012-05-16 다이슨 테크놀러지 리미티드 선풍기 조립체
WO2019223988A1 (de) 2018-05-22 2019-11-28 Micronel Ag Radiale strömungsmaschine
CN115977974A (zh) * 2022-09-06 2023-04-18 广东罗曼智能科技股份有限公司 一种电吹风风机马达

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19605742A1 (de) * 1996-02-16 1997-08-21 Vorwerk Co Interholding Elektromotor mit einem Gebläserad
JP3840299B2 (ja) 1996-12-27 2006-11-01 日本テトラパック株式会社 パッケージ製造装置の折り線形成装置
DE19714644C2 (de) * 1997-04-09 1999-09-02 Draegerwerk Ag Gasfördereinrichtung für Beatmungs- und Narkosegeräte und dessen Verwendung
GB2334757B (en) * 1997-10-27 2002-03-20 Valeo Climate Control Inc Ventilation unit
ES2243004T3 (es) * 1998-09-11 2005-11-16 Peter John King Bombas de fluido.
CN102425573B (zh) * 2011-12-14 2014-04-09 中国舰船研究设计中心 一种低噪前向多翼式离心风机
CN108916963B (zh) * 2018-09-25 2023-11-07 广东海信家电有限公司 一种吸油烟机导流圈及吸油烟机

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH164929A (fr) * 1930-02-13 1933-10-31 Mitsubishi Zosen Kabushiki Kai Rotor de turbo-soufflante, de pompe centrifuge ou d'autre machine semblable.
DE1403032A1 (de) * 1956-06-13 1968-10-03 Electrolux Corp Zentrifugalgeblaese
DE2024023A1 (de) * 1969-05-19 1970-11-26 Air Control Installations Ltd., Chard, Somerset (Großbritannien) Mehrstufiges Gebläse
DE2502988A1 (de) * 1975-01-25 1976-07-29 Kuehnle Kopp Kausch Ag Laufrad eines radialgeblaeses
US4269571A (en) * 1979-08-14 1981-05-26 Kabushiki Kaisha Shikutani Blowing apparatus
GB2209474A (en) * 1987-09-08 1989-05-17 Chapman & Smith Limited Respirators

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB430039A (de) *
GB150286A (en) * 1919-08-21 1921-07-14 Stanley Stacey Cramer Improvements in and relating to centrifugal pumps for use with pneumatically operated mechanisms
GB557312A (en) * 1942-09-08 1943-11-15 George William Stanley Improvements in axial type compressors
US2726033A (en) * 1951-12-07 1955-12-06 Gen Electric Fan and motor unit assembly
US3224667A (en) * 1965-01-29 1965-12-21 Mc Graw Edison Co Multi-stage air blower
CA1064209A (en) * 1975-06-18 1979-10-16 Matsushita Electric Industrial Co., Ltd. Fluid exhausting device
GB2190429B (en) * 1986-04-14 1990-10-17 Hitachi Ltd An electric blower
DE3706772A1 (de) * 1987-03-03 1988-09-15 Gebhardt Gmbh Wilhelm Ventilatoreinheit und verfahren zur herstellung der leitschaufeln einer solchen ventilatoreinheit
JPH0765597B2 (ja) * 1989-03-01 1995-07-19 株式会社日立製作所 電動送風機

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH164929A (fr) * 1930-02-13 1933-10-31 Mitsubishi Zosen Kabushiki Kai Rotor de turbo-soufflante, de pompe centrifuge ou d'autre machine semblable.
DE1403032A1 (de) * 1956-06-13 1968-10-03 Electrolux Corp Zentrifugalgeblaese
DE2024023A1 (de) * 1969-05-19 1970-11-26 Air Control Installations Ltd., Chard, Somerset (Großbritannien) Mehrstufiges Gebläse
DE2502988A1 (de) * 1975-01-25 1976-07-29 Kuehnle Kopp Kausch Ag Laufrad eines radialgeblaeses
US4269571A (en) * 1979-08-14 1981-05-26 Kabushiki Kaisha Shikutani Blowing apparatus
GB2209474A (en) * 1987-09-08 1989-05-17 Chapman & Smith Limited Respirators

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1318311A2 (de) * 1998-08-13 2003-06-11 CHAFFEE, Robert B. Batteriegespeistes Gerät
EP1318311A3 (de) * 1998-08-13 2004-01-02 CHAFFEE, Robert B. Batteriegespeistes Gerät
CN100395455C (zh) * 2002-01-21 2008-06-18 株式会社荏原制作所 叶轮及具有该叶轮的多级泵
KR101145790B1 (ko) 2009-03-04 2012-05-16 다이슨 테크놀러지 리미티드 선풍기 조립체
KR101214052B1 (ko) 2009-03-04 2012-12-20 다이슨 테크놀러지 리미티드 선풍기 조립체
WO2019223988A1 (de) 2018-05-22 2019-11-28 Micronel Ag Radiale strömungsmaschine
US11754092B2 (en) 2018-05-22 2023-09-12 Micronel Ag Radial turbomachine
CN115977974A (zh) * 2022-09-06 2023-04-18 广东罗曼智能科技股份有限公司 一种电吹风风机马达
CN115977974B (zh) * 2022-09-06 2023-10-13 广东罗曼智能科技股份有限公司 一种电吹风风机马达

Also Published As

Publication number Publication date
DE4130901A1 (de) 1992-06-25
DE9111573U1 (de) 1992-01-16
GB9027592D0 (en) 1991-02-13
GB2251035A (en) 1992-06-24
KR920012760A (ko) 1992-07-27

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