EP1845268A1 - Ventilateur axial - Google Patents

Ventilateur axial Download PDF

Info

Publication number
EP1845268A1
EP1845268A1 EP07075273A EP07075273A EP1845268A1 EP 1845268 A1 EP1845268 A1 EP 1845268A1 EP 07075273 A EP07075273 A EP 07075273A EP 07075273 A EP07075273 A EP 07075273A EP 1845268 A1 EP1845268 A1 EP 1845268A1
Authority
EP
European Patent Office
Prior art keywords
blade
strip
axial fan
boss
fan according
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.)
Granted
Application number
EP07075273A
Other languages
German (de)
English (en)
Other versions
EP1845268B1 (fr
Inventor
Henricus Johannes Bernardus Olthof
Giorgio Cipelletti
Hendrik Fedde Van Der Spek
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.)
Howden Netherlands BV
Original Assignee
Howden Netherlands BV
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
Priority claimed from EP06075861A external-priority patent/EP1845267A1/fr
Application filed by Howden Netherlands BV filed Critical Howden Netherlands BV
Priority to EP20070075273 priority Critical patent/EP1845268B1/fr
Publication of EP1845268A1 publication Critical patent/EP1845268A1/fr
Application granted granted Critical
Publication of EP1845268B1 publication Critical patent/EP1845268B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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

Definitions

  • the invention relates to an axial fan comprising a boss and a number of blades evenly distributed and arranged to the boss, wherein the blades have an aerofoil profile.
  • Such fans have a diameter of typically 5 meters.
  • To guide the airflow such fans are placed in a ring which has preferably a bell shaped inlet.
  • the commonly known fans have a high number of parts and some of these parts have high manufacturing costs.
  • a fan according to the prior art is shown in exploded view.
  • Such a fan comprises a boss 1 onto which a mounting plate 2 is arranged.
  • the connection of the mounting plate 2 with the boss 1 is made by six bolts 3, washers 4 and bushings 5.
  • Each blade 6 having an aerofoil profile is mounted onto the mounting plate 2.
  • a cast metal block 7 is bolted to the mounting plate 2 with bolts 8 and washers 9.
  • This cast metal block 7 comprises an elastic insert 10 to dampen vibrations.
  • this elastic insert 10 a hole is provided through which bolt 11 runs and with which fork 12 is connected.
  • a metal tube 13 is then locked onto the fork 12 with plate 14 threaded ends 15, washers 16 and nuts 17.
  • the tube 13 protrudes into the hollow blade 6 and is connected thereto by bolts 18, washers 19 and nuts 20.
  • the hollow blade 6 is closed off by end caps 21 and 22.
  • a cover plate 23 can be arranged at the cast metal blocks 7.
  • ceiling fans are known in the prior art, in which the blades are fixed to the hub by a strip. This provides for a low cost solution, but it is not possible to make any adjustments to the position and orientation of the blades in relation to the hub. Furthermore, the known ceiling fans have flat, sheet-like blades without an aerofoil profile.
  • Each blade is hollow and the strip is at least partially inserted into the blade, and that at least one fastener runs from the surface of the blade through a corresponding opening in the strip to the opposite surface of the blade, wherein the corresponding opening in the strip is a slot, such that the pitch of the blade is adjustable.
  • the strip with which the blades are arranged to the hub provide vibration damping which is achieved by the rubber in the cast metal block 7 of a device according to the prior art. Furthermore the manufacturing costs of a strip are far less than manufacturing a cast metal block 7 and a corresponding fork 12, as is the case in a device according to the prior art. By arranging at least part of the strip into the blade, the need for the additional tube 13 with plate 14 and corresponding mounting parts, as in a device according to the prior art, are prevented.
  • the pitch of the blade is still adjustable. So due to this arrangement an axial fan with less parts and consequently with reduced manufacturing costs is achieved, while the necessary adjustment options, in particular the adjustment of the pitch of the blade, are maintained.
  • the strip is substantially L-shaped.
  • the boss is substantially cylindrical and the short leg of the L-shaped strip is concave and adapted to the circumferential wall of the boss. Accordingly the L-shaped strip can be directly mounted onto the boss avoiding the need of a special mounting plate.
  • a mounting plate having a flat mounting surface is provided for each blade on the boss and the short leg of the L-shaped strip is mounted on the flat mounting surface.
  • an additional mounting plate has to be provided, it avoids the need to make the short leg of the L-shaped strip concave.
  • the necessary mounting surface is a small plate having a concave surface and an opposite flat surface. Depending on the manufacturing costs, either the embodiment with the mounting plate can be chosen or the embodiment with the short leg being concave.
  • a filler element is inserted into the hollow blade.
  • This filler element can be a very simple part, for example a cylinder, as the filler element only needs to resist the tightening forces of the fastener running through the blade and the L-shaped strip.
  • the filler element is substantially cylindrical and the end of the strip inserted into the hollow blade is concave. Due to the concave shape of the strip, the strip is guided along the cylindrical element and it is ensured that adjustment of the pitch of the blade will occur centered around the cylindrical filler element.
  • the filler element comprises two semi-cylindrical parts arranged on either side of the end of the strip inserted into the hollow blade. This provides for a further simplified axial fan according to the invention, because the end of the strip inserted into the hollow blade, can stay flat, while centered adjustment of the pitch is still ensured.
  • the inner wall of the cavity in which the filler element is inserted is at least partially adapted to the outer surface of the filler element. This further contributes to a centered adjustment of the pitch of the blade without risk to misalignment of the blade in relation to the hub.
  • the filler element is positioned between the slot openings. This reduces the costs as no holes have to be arranged in the filler element. Furthermore the clamping is improved as a result.
  • the axial fan may comprise a ring shaped housing coaxially arranged to the boss. This ring shaped housing will guide the air propelled by the blades of the fan.
  • Figure 1 is an exploded view of an axial fan according to the prior art.
  • Figure 2 shows an embodiment of the axial fan according to the invention in exploded view.
  • Figure 3 shows a second embodiment of the axial fan according to the invention.
  • Figure 4 shows a third embodiment of the axial fan according to the invention.
  • FIG 2 an axial fan 30 according to the invention is shown.
  • This axial fan 30 has a boss 31 onto which the blades 32 are mounted.
  • the L-shaped strip 33 has a short leg 34, which is concave and directly bolted onto the cylindrical outer surface of the boss 31 with bolts 35 and washers 36.
  • the long leg 37 of the L-shaped strip 33 is partially bent and provided with slot openings 38. This bent part of the long leg 37 is inserted into the hollow blade 32. It is also possible to mount the long leg of the L-shaped strip on the outside of the blade.
  • a filler element 47 is also inserted into the blade 32, after which bolts 39 are inserted attaching the L-shaped strip 33, the filler element 47 and the blade 32 to each other. The bolts 39 are tightened by nuts 40 and washers 41.
  • the hollow blade 32 is closed off by end caps 42 and 43.
  • a closing plate 44 can be attached to the boss 31 by bolts 45 and washers 46. This closing plate 44 prevents an air flow through the center of the axial fan.
  • FIG. 3 shows a second embodiment of a axial fan 50 according to the invention.
  • This axial fan 50 has a hub 51 and blades 52. These blades 52 are arranged to the hub 51 by a strip 53.
  • One end of the flat strip 53 is bolted to the hub 51 by bolts 54.
  • the other end 55 of the strip 53 is concave and provided with slot openings 56.
  • This end 55 is inserted into the hollow blade 52 together with a filler element 57.
  • the end 55 and filler element 57 are mounted in the hollow blade 52 by bolts 58.
  • the slot openings 56 enables the pitch of the blade 52 to be adjusted.
  • the blade 52 together with the filler element 57 can rotate relative to the strip 53 due to the slot openings 56.
  • the upper surface of the filler element 57 is partially cylindrical and the inner wall 59 of the cavity in the blade 52 is provided with a concave cylindrical surface.
  • FIG. 4 shows part of a third embodiment of an axial fan according to the invention.
  • a hollow blade 60 is arranged to a hub (not shown), by a flat strip 61.
  • a semi cylindrical filler part 62, 63 is arranged on either side of the flat strip 61 .
  • This flat strip 61 with the two semi cylindrical filler parts 62, 63 is inserted into the hollow blade 60 such that the filler part 62 is in contact with the inner wall 64 and the filler part 63 is in contact with the concave inner wall 65.
  • two slot openings 66 are arranged through which bolts 67 extend and with which the blade is attached to the strip 61. Together with washers 68 and nuts 69 the hollow blade 60 can be attached to the strip 61 in a desired pitch angle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP20070075273 2006-04-11 2007-04-11 Ventilateur axial Active EP1845268B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20070075273 EP1845268B1 (fr) 2006-04-11 2007-04-11 Ventilateur axial

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP06075861A EP1845267A1 (fr) 2006-04-11 2006-04-11 Ventilateur axial
EP20070075273 EP1845268B1 (fr) 2006-04-11 2007-04-11 Ventilateur axial

Publications (2)

Publication Number Publication Date
EP1845268A1 true EP1845268A1 (fr) 2007-10-17
EP1845268B1 EP1845268B1 (fr) 2009-10-14

Family

ID=38481509

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070075273 Active EP1845268B1 (fr) 2006-04-11 2007-04-11 Ventilateur axial

Country Status (1)

Country Link
EP (1) EP1845268B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2010246122B2 (en) * 2009-05-04 2015-06-18 Aspen Motion Technologies, Inc Ceiling fan with variable blade pitch and variable speed control
EP3143287B1 (fr) * 2014-05-13 2018-10-10 R.E.M. Holding S.r.l. Pale pour ventilateur axial industriel et ventilateur axial industriel comprenant une telle pale

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1165738A (en) * 1966-11-01 1969-10-01 Cooling Dev Ltd Improvements in and relating to Fan-Type Impellers and to Blade Assemblies for use therewith
US4366387A (en) * 1979-05-10 1982-12-28 Carter Wind Power Wind-driven generator apparatus and method of making blade supports _therefor
WO1994009277A1 (fr) * 1992-10-19 1994-04-28 Ceute S.A. Dispositif ameliore pour connecter des pales au moyeu dans des helices de ventilateurs, d'avions et dans d'autres applications
US5873701A (en) * 1997-07-14 1999-02-23 Shiu; Sun-Quen Device for connecting brackets and a motor of a ceiling fan

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1165738A (en) * 1966-11-01 1969-10-01 Cooling Dev Ltd Improvements in and relating to Fan-Type Impellers and to Blade Assemblies for use therewith
US4366387A (en) * 1979-05-10 1982-12-28 Carter Wind Power Wind-driven generator apparatus and method of making blade supports _therefor
WO1994009277A1 (fr) * 1992-10-19 1994-04-28 Ceute S.A. Dispositif ameliore pour connecter des pales au moyeu dans des helices de ventilateurs, d'avions et dans d'autres applications
US5873701A (en) * 1997-07-14 1999-02-23 Shiu; Sun-Quen Device for connecting brackets and a motor of a ceiling fan

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2010246122B2 (en) * 2009-05-04 2015-06-18 Aspen Motion Technologies, Inc Ceiling fan with variable blade pitch and variable speed control
EP2427653A4 (fr) * 2009-05-04 2016-01-06 Richard A Oleson Ventilateur de plafond dont le pas des pales et la commande de vitesse sont variables
US11434915B2 (en) 2009-05-04 2022-09-06 Delta T, Llc Ceiling fan with variable blade pitch and variable speed control
EP3143287B1 (fr) * 2014-05-13 2018-10-10 R.E.M. Holding S.r.l. Pale pour ventilateur axial industriel et ventilateur axial industriel comprenant une telle pale

Also Published As

Publication number Publication date
EP1845268B1 (fr) 2009-10-14

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