US3231313A - Axial fan with adjustable blades - Google Patents

Axial fan with adjustable blades Download PDF

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Publication number
US3231313A
US3231313A US382010A US38201064A US3231313A US 3231313 A US3231313 A US 3231313A US 382010 A US382010 A US 382010A US 38201064 A US38201064 A US 38201064A US 3231313 A US3231313 A US 3231313A
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US
United States
Prior art keywords
hub
blades
cover disk
disk
chamber
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
US382010A
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English (en)
Inventor
Fermer Karl-Erik
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.)
Svenska Flaktfabriken AB
Original Assignee
Svenska Flaktfabriken AB
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Filing date
Publication date
Application filed by Svenska Flaktfabriken AB filed Critical Svenska Flaktfabriken AB
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Publication of US3231313A publication Critical patent/US3231313A/en
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Expired - Lifetime 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 improvements in axial fans for the transport of dust laden gases, the fans being equipped with adjustable fan blades. Adjustability is provided by journalled axles mounted in the fan hub, and an axially displaceable adjustment means projecting into the hub and adapted to actuate rotating levers mounted on the blade journals.
  • the adjustment means is enclosed in a casing designed as a stationary central body portion mounted on the outlet side of the impeller with a diameter corresponding to the fan hub.
  • the fan comprises a cover disk mounted on the open side of the fan hub and is provided with a central, flanged aperture for the adjusting device.
  • An annular chamber encloses the flange and is provided with seals in abutting engagement against the flange, the chamber being mounted on the frontal wall portion of the casing body which faces the impeller.
  • the chamber is connected to air supply means for the supply of air under pressure (barrier air) for preventing the dust laden gas from entering through the gap between the casing body and the fan hub.
  • the fan may be constructed such that scavenging air also can be supplied in a known manner for cleaning the fan blades and their bearings.
  • FIG. 1 is a fragmentary sectional view of an axial fan constructed in accordance with the invention.
  • FIG. 2 is a fragmentary sectional view taken along line 22 of FIG. 1.
  • 1 is an axial impeller comprising a radially extending concentric hub 2 mounted on a rotatable shaft 3 and provided with a plurality of adjustable-pitch fan blades 4 rotatably journalled in the hub and disposed about the periphery thereof, and an enclosing cylindrical casing 5.
  • Each of the blades is provided with a circular base plate 6 and an axle 7 mounted in two ball bearings 8 in a recess in the hub.
  • a lever 9 is connected at the inner or other end of the axle facing the center, and in the present instance supports a rotatably mounted roller 10.
  • Adjustment means comprising an axially displaceable adjusting disk 12 having a peripheral groove 11, is adapted to be moved forward and backward "ice by a shaft 13 by a control means (not shown), and by engaging the lever to effect adjustment of the pitch of the blades to the desired angle with the plane of rotation.
  • the disk connects to the lever through the roller 10 and the groove 11.
  • the control means of the adjustment means is enclosed in a stationary casing 14 designed as the central body, and is mounted on the outlet side of the impeller with a diameter substantially corresponding to that of the hub.
  • annular hollow chamber 15 is mounted and connected by a pipe 16 to air supply means, in the present instance a blower 27 for the supply of air under pressure.
  • air supply means in the present instance a blower 27 for the supply of air under pressure.
  • Inwardly projecting forward and rear walls 17a and 17b respectively of the chamber have termini adjacent to but spaced from a flange 19 on a conically shaped cover disk 20 mounted on the open side of the hub.
  • the flange 19 defines a central aperture 21 to receive and circumscribe the shaft of the adjusting device.
  • a radial seal is connected to at least the rear one of the walls 17 b of the chamber and engages with the cover disk 20 which rotates with the hub 2.
  • both walls 17a and 1711 are provided with such seals 18a and 18b respectively, while the for-ward seal 18a may only loosely engage the cover disk.
  • the reason for the loose engagement is that by supplying a relatively small amount of air to the annular chamber 15 an overpressure can be maintained in the chamber 15.
  • an air stream is produced in an annular slot comprising a space 22 and a gap 23.
  • the air stream has an outward direction through the space 22 and the gap 23, the hub and the cover disk 20 along with the frontal wall 14a defining the slot and thereby preventing the dust laden gas transported by the fan from entering through the gap.
  • the journals of the blades are provided in a known maner with boreholes 24 and 25 connected to an air supply means (not shown) and an opening the the gap 26 about the base plate of the fan blade.
  • an axial fan for transporting dust laden gases comprising a radially-extending concentric hub mounted on a rotatable shaft, a plurality of adjustable-pitch fan blades disposed about the periphery of said hub, said hub having recesses about its periphery, a circular base plate and a rotatable axle mounting each of said blades intermediate a recess in said hub and said blades, said axle mounting a lever at its inner end, adjustment means comprising an axially disposed adjustable shaft mounting a disk, said disk connected to said lever so as to cause changes of pitch in said blades upon axial displacement of said shaft, an annular cover disk connected to said hub and having a central terminus defining an aperture to receive and circumscribe said adjustable shaft; a stationary casing mounted on the outlet side of said impeller and having a frontal wall portion confronting said hub and said cover disk and spaced therefrom so as to define an annular slot therebetween, an inwardly projecting pair of spaced walls defining a hollow chamber connected to said frontal
  • said cover disk is conical in configuration and wherein said terminus of said cover disk has a flanged portion projecting axially along said adjustable shaft, said frontal wall portion having an inward slope and said casing having an outer diameter substantially equal to the diameter of said hub and a rotatable axle mounting each of said blades intermediate a recess in said hub and said blades, said axle mounting a lever at its inner end, adjustment means comprising an axially disposed adjustable shaft mounting a disk, said disk connected to said lever so as to cause a change of pitch in said blades upon axial displacement of said shaft, an annular cover disk connected to said hub and having a central flanged portion to receive and circumscribe said adjustable shaft; a stationary casing mounted on the outlet side of said impeller having an inwardly sloping frontal wall portion confronting said hub and said cover disk and spaced therefrom so as to define an annular slot therebetween, an inwardly projecting pair of spaced

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US382010A 1963-07-12 1964-07-13 Axial fan with adjustable blades Expired - Lifetime US3231313A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE776163 1963-07-12

Publications (1)

Publication Number Publication Date
US3231313A true US3231313A (en) 1966-01-25

Family

ID=20272234

Family Applications (1)

Application Number Title Priority Date Filing Date
US382010A Expired - Lifetime US3231313A (en) 1963-07-12 1964-07-13 Axial fan with adjustable blades

Country Status (5)

Country Link
US (1) US3231313A (de)
AT (1) AT243424B (de)
CH (1) CH401336A (de)
ES (1) ES301940A1 (de)
GB (1) GB999038A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3392789A (en) * 1965-10-28 1968-07-16 Svenska Flaektfabriken Ab Sealing element
US3844680A (en) * 1971-03-30 1974-10-29 Svenska Flaektfabriken Ab Adjustable-pitch axial fan
US3935625A (en) * 1971-03-30 1976-02-03 Aktiebolaget Svenska Flaktfabriken Method of manufacturing axial fans of different sizes
US4648791A (en) * 1984-06-30 1987-03-10 Bbc Brown, Boveri & Company, Limited Rotor, consisting essentially of a disc requiring cooling and of a drum
US4921403A (en) * 1988-01-15 1990-05-01 Dowty Rotol Limited Propeller blade assembly
CN112360747A (zh) * 2020-11-12 2021-02-12 石家庄石一泵业有限公司 一种在线扬程可调的离心泵
CN114060136A (zh) * 2021-11-03 2022-02-18 苏州睿昕汽车配件有限公司 一种变流量电控风扇

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4042079A (en) * 1975-05-30 1977-08-16 All American Industries, Inc. Variable energy absorber for aircraft arresting system
SE433108B (sv) * 1977-05-17 1984-05-07 Flaekt Ab Axialflekt med ett flekthjul med instellbara skovlar
CN107781216B (zh) * 2016-08-29 2019-10-22 长城汽车股份有限公司 扇叶调节装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3029011A (en) * 1955-10-13 1962-04-10 Bristol Siddeley Engines Ltd Rotary compressors or turbines
US3101890A (en) * 1961-05-29 1963-08-27 Westinghouse Electric Corp Fans having radial flow rotors in axial flow casings
US3139310A (en) * 1961-12-29 1964-06-30 Svenska Flaektfabriken Ab Arrangement in axial fans for the transport of dust commingled gases

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3029011A (en) * 1955-10-13 1962-04-10 Bristol Siddeley Engines Ltd Rotary compressors or turbines
US3101890A (en) * 1961-05-29 1963-08-27 Westinghouse Electric Corp Fans having radial flow rotors in axial flow casings
US3139310A (en) * 1961-12-29 1964-06-30 Svenska Flaektfabriken Ab Arrangement in axial fans for the transport of dust commingled gases

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3392789A (en) * 1965-10-28 1968-07-16 Svenska Flaektfabriken Ab Sealing element
US3844680A (en) * 1971-03-30 1974-10-29 Svenska Flaektfabriken Ab Adjustable-pitch axial fan
US3935625A (en) * 1971-03-30 1976-02-03 Aktiebolaget Svenska Flaktfabriken Method of manufacturing axial fans of different sizes
US4648791A (en) * 1984-06-30 1987-03-10 Bbc Brown, Boveri & Company, Limited Rotor, consisting essentially of a disc requiring cooling and of a drum
US4921403A (en) * 1988-01-15 1990-05-01 Dowty Rotol Limited Propeller blade assembly
CN112360747A (zh) * 2020-11-12 2021-02-12 石家庄石一泵业有限公司 一种在线扬程可调的离心泵
CN112360747B (zh) * 2020-11-12 2022-07-01 石家庄石一泵业有限公司 一种在线扬程可调的离心泵
CN114060136A (zh) * 2021-11-03 2022-02-18 苏州睿昕汽车配件有限公司 一种变流量电控风扇

Also Published As

Publication number Publication date
ES301940A1 (es) 1965-01-16
CH401336A (fr) 1965-10-31
GB999038A (en) 1965-07-21
AT243424B (de) 1965-11-10

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