EP0208031A1 - Construction de ventilateur - Google Patents

Construction de ventilateur Download PDF

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Publication number
EP0208031A1
EP0208031A1 EP85304883A EP85304883A EP0208031A1 EP 0208031 A1 EP0208031 A1 EP 0208031A1 EP 85304883 A EP85304883 A EP 85304883A EP 85304883 A EP85304883 A EP 85304883A EP 0208031 A1 EP0208031 A1 EP 0208031A1
Authority
EP
European Patent Office
Prior art keywords
blades
torsion bar
blade
shaft
fan
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Withdrawn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
EP85304883A
Other languages
German (de)
English (en)
Inventor
Samuel Orr Kennedy
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.)
James Howden and Co Ltd
Original Assignee
James Howden and Co 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 James Howden and Co Ltd filed Critical James Howden and Co Ltd
Priority to EP85304883A priority Critical patent/EP0208031A1/fr
Publication of EP0208031A1 publication Critical patent/EP0208031A1/fr
Withdrawn legal-status Critical Current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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/34—Blade mountings
    • F04D29/36—Blade mountings adjustable
    • F04D29/362—Blade mountings adjustable during rotation

Definitions

  • the present invention relates to fans.
  • Fans usually comprise a rotatable shaft having secured thereto a hub and a plurality of blades, the axes of which extend generally radially outwardly with respect to the axis of rotation of the fan shaft.
  • the blades may either be fixed blades in which case they are secured to the hub by bolted blade root flanges or, they can be variable pitch blades which involve complex blade bearing suspension systems allowing all of the blades to be pivoted about their respective axes simultaneously.
  • the hub usually includes a radial support plate connected to the fan shaft and a hub ring at the outer edge of the support plate, on which the blades are mounted.
  • the load is accommodated by the hub which requires, normally, a complex, high strength structural rim and support plate.
  • a fan comprising a rotatable fan shaft, a hub mounted on the shaft, a plurality of blades, the axes of which extend generally radially outwardly with respect to the axis of rotation of the fan shaft, means to mount the inner ends of the blades on the hub, said means including a torsion bar spring secured, at one end, directly to the inner end of each blade, and, at the other end, directly to the shaft, and each serving to act as a strut to transmit the blade axial loads.
  • a torsion bar spring as the mounting means for the inner end of each blade is a very simple method of mounting the blade and yet eliminates the requirement for any further blade axial thrust bearing. It also is capable of absorbing blade vibration thus removing the requirement for large blade flanges, large bolts, large hubs and complex blade bearing suspension systems. In fact, because of the absorption of the vibration and the removal of the requirement for carrying the loads on the hub rim, the whole blade mounting structure in the form of the hub and the shaft can be of a less robust nature than has hitherto been necessary, which significantly reduces the cost as well as the weight of the fan.
  • Each blade may be provided with a blade root boss engagable in a recess in the hub and said one end of the torsion bar can be connected to the blade root boss.
  • a torsion bar can apply to constant pitch fans, in which case there is no need for heavy bolting flanges, as mentioned above.
  • the torsion bar can be provided in a fan having pitch control means to vary the pitch of all the blades simultaneously.
  • the torsion bar can be so designed that the resulting rotation of the blades about their individual axes is accommodated by suitable twisting of the associated torsion bar springs. While this will provide a certain torsional, resilient restoring moment, if the torsion bar is in its relaxed condition at the normal operating pitch of the blades, then this resilient restoring moment need not produce any problem.
  • pitch control means can be provided at any position along the length of the torsion bars, it is preferably provided adjacent the one end of the torsion bar which is attached to the blade root.
  • a plurality of blades 16 each having, at their radially inner end, a blade root boss 20 which is secured to one end 22 of a torsion bar spring 24.
  • the other end 26 of the torsion bar spring is secured directly to impeller shaft 10.
  • the torsion bar springs may be secured in any way to the shaft and to the blade root bosses, e.g. by welding. In order to facilitate their removal and the removal of the individual blades, however, they are preferably threaded at their ends and screwed into threaded bores 25,27 in the shaft and blade root bosses respectively. Suitable locking means, such as lock nuts (not shown) are advantageously provided.
  • the blade root bosses 20 are of frusto-conical form and are engaged in corresponding recesses 28 in the hub rim 15.
  • the torsion bar spring 24 for each blade which acts as a strut directly connecting the blade root boss 20 to the impeller shaft 10
  • a regulated and balance lever assembly 30 having arms 31, one of which is provided with a thrust block 32 engaged in a channel 36.
  • the hub support plate 14 has mounted therewithin an actuator support bearing 34 within which is mounted an hydraulic actuator 35, the actual movement of which is controlled by a spool valve 37 mounted on a rotating union 31.
  • An actuator piston retaining rod 33 is shown within a regulating disc 39 which is provided with the external channel 36 in which the block 32 is mounted.
  • the signal from the spool valve 37 causes the actuator 34 to cause axial movement of the regulating disc 35 and its associated channel 36 which causes axial movement with respect to the shaft of the fan, of the thrust block 32, which in turn causes pivoting of each torsion bar 24 and its associated blade 16 about the axis of that torsion bar thereby to adjust the angle of each blade. It will be appreciated that all of the blades 16 are adjusted in the same way simultaneously. This adjustment movement is accommodated within the twisting capability of each respective torsion bar spring 24, while still allowing the latter to absorb blade vibrations.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP85304883A 1985-07-09 1985-07-09 Construction de ventilateur Withdrawn EP0208031A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP85304883A EP0208031A1 (fr) 1985-07-09 1985-07-09 Construction de ventilateur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85304883A EP0208031A1 (fr) 1985-07-09 1985-07-09 Construction de ventilateur

Publications (1)

Publication Number Publication Date
EP0208031A1 true EP0208031A1 (fr) 1987-01-14

Family

ID=8194284

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85304883A Withdrawn EP0208031A1 (fr) 1985-07-09 1985-07-09 Construction de ventilateur

Country Status (1)

Country Link
EP (1) EP0208031A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1046572C (zh) * 1992-10-14 1999-11-17 Abb.弗拉克特有限公司 一种角度可调的叶片悬置装置
CN104141634A (zh) * 2013-05-08 2014-11-12 鸿富锦精密工业（深圳）有限公司 风扇
CN109026837A (zh) * 2018-10-16 2018-12-18 王永挺 一种排风扇及其风扇叶
WO2018232838A1 (fr) * 2017-06-23 2018-12-27 广东美的制冷设备有限公司 Roue éolienne, ventilateur et équipement de réfrigération
CN111623455A (zh) * 2020-04-16 2020-09-04 华南理工大学 一种建筑工程用通风结构
DE102021201960A1 (de) 2021-03-02 2022-09-08 Zf Friedrichshafen Ag Flügelrad für eine elektrische Maschine und elektrische Maschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB590141A (en) * 1945-04-13 1947-07-09 Power Jets Res & Dev Ltd Improvements in and relating to variable pitch fans, axial flow compressors and the like
US2495434A (en) * 1946-05-17 1950-01-24 Joy Mfg Co Variable pitch propeller
FR1263168A (fr) * 1960-07-28 1961-06-05 Sulzer Ag Dispositif de fixation des aubes de roue mobile des soufflantes axiales
DE1503480A1 (de) * 1965-01-29 1970-07-02 Kuehnle Kopp Kausch Ag Verstellbare Laufschaufel fuer axiale Stroemungsmaschinen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB590141A (en) * 1945-04-13 1947-07-09 Power Jets Res & Dev Ltd Improvements in and relating to variable pitch fans, axial flow compressors and the like
US2495434A (en) * 1946-05-17 1950-01-24 Joy Mfg Co Variable pitch propeller
FR1263168A (fr) * 1960-07-28 1961-06-05 Sulzer Ag Dispositif de fixation des aubes de roue mobile des soufflantes axiales
DE1503480A1 (de) * 1965-01-29 1970-07-02 Kuehnle Kopp Kausch Ag Verstellbare Laufschaufel fuer axiale Stroemungsmaschinen

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1046572C (zh) * 1992-10-14 1999-11-17 Abb.弗拉克特有限公司 一种角度可调的叶片悬置装置
CN104141634A (zh) * 2013-05-08 2014-11-12 鸿富锦精密工业（深圳）有限公司 风扇
CN104141634B (zh) * 2013-05-08 2016-12-21 青岛玉兰祥商务服务有限公司 风扇
WO2018232838A1 (fr) * 2017-06-23 2018-12-27 广东美的制冷设备有限公司 Roue éolienne, ventilateur et équipement de réfrigération
CN109026837A (zh) * 2018-10-16 2018-12-18 王永挺 一种排风扇及其风扇叶
CN109026837B (zh) * 2018-10-16 2024-02-13 王永挺 一种排风扇及其风扇叶
CN111623455A (zh) * 2020-04-16 2020-09-04 华南理工大学 一种建筑工程用通风结构
DE102021201960A1 (de) 2021-03-02 2022-09-08 Zf Friedrichshafen Ag Flügelrad für eine elektrische Maschine und elektrische Maschine

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19870714

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Inventor name: ORR KENNEDY, SAMUEL