US3907460A - Vane with an axle pin for axial impeller wheels - Google Patents

Vane with an axle pin for axial impeller wheels Download PDF

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Publication number
US3907460A
US3907460A US435627A US43562774A US3907460A US 3907460 A US3907460 A US 3907460A US 435627 A US435627 A US 435627A US 43562774 A US43562774 A US 43562774A US 3907460 A US3907460 A US 3907460A
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US
United States
Prior art keywords
vane
axle pin
pin
screw thread
diameter
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
US435627A
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English (en)
Inventor
Bendt Ove Pedersen
Ole Jacobsen Bredsted
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.)
Novenco Building and Industry AS
Original Assignee
Nordisk Ventilator Co
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 Nordisk Ventilator Co filed Critical Nordisk Ventilator Co
Application granted granted Critical
Publication of US3907460A publication Critical patent/US3907460A/en
Anticipated expiration legal-status Critical
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

  • a vane with an axle pin for axial flow fans comprising a number of vanes, each of which being with its axle pin, connected with a screw thread to the vane root, accommodated rotatably in the hub rim of the impeller wheel.
  • the pins are connected to means for turning the total number of vanes around their axes and the axes of the associated pins during the operation of the wheel.
  • each pin is provided with a portion having a smaller diameter than the bottom diameter of the screw thread and inside the screw thread it is provided with a portion having a larger diameter than the outer diameter of the screw thread, the bore of the vane being designed as corresponding reamed holes inside and outside a portion having a screw thread corresponding to the screw thread of the pin.
  • a fixation ring is provided on the pin and through the vane root a fixation screw is screwed in, the end of which engages a reamed aperture in the fixation ring.
  • the invention relates to a vane with an axle pin for axial flow fans comprising a number of vanes, each of which with its pin, connected with a screw thread to the vane root, is accommodated rotatably in the hub rim of the impeller wheel and where within the hub rim the pins are connected to means for turning the total number of vanes around their axes and the axes of the associated pins during the operation of the wheel.
  • each vane is secured to a wheel rim by the vane root, which extends through a bore with a bearing in the wheel rim, being provided with a bore having a screw thread extending to the bottom of the bore, into which screw thread a shaft pin has been screwed, the said shaft 'pin being at its opposite end via an end piece with a bearing connected to the hub.
  • the screw thread in the bore of the vane foot will, besides being subjected to the centrifugal forces acting in the axial direction, also be subjected to considerable radial forces, and this makes it necessary, in particular in the case of fast-running axial flow impeller wheels having large diameters, to have the screw thread designed as a very tight-fitting thread.
  • Such a tight-fitting screw thread will, however, besides increased costs of manu facture, also, as is mentioned in the following, cause that the screwing in of the pin is made difficult and that the risk of damage to the screw thread during this screwing-in operation is increased.
  • each pin outside its screw thread intended for being vane, the end of which fixation screw engages a reamed or fitting opening in the fixation ring.
  • the construction of the pin as fitting pins inside and outside the screw thread in connection with the corresponding reamed or fitting bores in the vane serves for absorbing radial forces, so that the screw thread is intended for absorbing only the centrifugal force directed in the axial direction.
  • the torsional forces occurring are during periods of standstill absorbed by the fixation screw through the fixation ring, and as this screw passes through the vane root in the axial direction, the hole in the vane root can be bored in a place where it does not cause any perceptible weakening of the material and, moreover, at such a distance from the axis that the reaction exerted by the screw against the torsion will act on a fairly large diameter so that a comparatively thin screw may be used.
  • the very great centrifugal force acting on the vane in the axial direction of the pin causes that the thread is self-blocking and thereby absorbs the torsional forces.
  • the fixation ring may be constructed in one piece with the pin, but since it has a considerably larger diameter than the remaining part of the pin this causes a large waste of material, so that a shrinking-on of the fixation ring will be preferable.
  • the fixation ring has been shrunk onto the pin, while its aperture viewed in the direction at right angles to its plane is divided into two circular eccentrical sections, and the pin is provided with an eccentrical part corresponding to one of these sections.
  • FIG. 1 diagrammatically shows part of an axial flow impeller wheel with a few vanes with the associated pins in an embodiment of the invention and FIG. 2 shows a section on line II-II in FIG. 1, a larger part of the wheel being, however, shown in this illustration.
  • the hub 2 of the wheel is secured on the wheel shaft 1.
  • the hub is in this embodiment constructed in one piece with a hub disc 3 and a hub rim 4.
  • a number of vanes 5 have been accommodated, each of which comprises an axle pin 6 in an axial bearing 7 secured with a nut 8 which at the same time secures an intermediate portion on the pin 6 with an adjustment arm 9 and with two balancing wings 10 which in their extreme ends are filled with lead 1 1 to achieve the necessary balancing.
  • Each adjustment arm 9 is by means of a link rod 12 connected to an adjustment disc 13 which is axially displaceable relative to the wheel, but rotates together with the latter by means of drivers, of which FIG. 2 shows a single driver 14.
  • the pin 6 is secured to the vane 5 at the root 15 of the vane by means of a screw thread 16. Outside the screw thread 16 the pin 6 has a fitting portion 17 having a smaller diameter than the bottom diameter of the screw thread, and inside the screw thread it has a fitting portion 18 with a diameter larger than the outer diameter of the screw thread. These fitting portions 17 and 18 fit into corresponding parts of the bore in the vane root 15 inside and outside the screw thread 16.
  • fitting portions serve for absorbing the radial forces, and for absorbing the torsional forces there has on the pin 6 been shrunk on a fixation ring 19 which cooperates with a fixation screw 20 which is screwed down through the vane root 15 with a threaded part 21 and at its end is provided with a fitting portion 22 for corresponding reamed holes in the vane root l5 and in the fixation ring 19.
  • the aperture of the fixation ring 19 is, viewed in the axial direction, designed with two sections which are mutually eccentrical, while the pin 6 is provided with two corresponding portions 23 and 24 fitting these sections, the portion 23 being eccentrical relative to the axis of the pin with the same degree of eccentricity as the two sections in the aperture of the fixation ring 19.
  • the fixation screw 20 is secured in the vane root 15 by means of a locking screw 25 which engages a turned-down groove 26 in the fixation screw 20 between the threaded part 21 and the fitting portion 22.
  • this groove 26 has a length which is sufficient for in part letting the fixation screw 20 go quite clear of the fixation ring 19, in part enabling the fixation screw to be screwed down to the full depth without it being necessary to remove the locking screw 25.
  • fitting portions 17 and 18 are shown cylindrical, but at any rate one of these portions may be designed so as to be conical.
  • a vane mounting assembly for an axial flow fan having a plurality of vanes (5) rotatably mounted in a hub rim (4) of an impeller wheel, each vane being mounted in the hub rim by an axle pin (6) having a threaded portion (16) engaging a correspondingly threaded portion in a bore in a root portion (15) of each vane, and including means (9, 12, 13) connected to each axle pin for simultaneously rotating all of the vanes about the axes of the axle pins, the improvements characterized by:
  • each vane including an inner portion having a diameter generally corresponding to and for receiving said first portion of the axle pin and an outer portion having a diameter generally corresponding to and for receiving said second portion of the axle pin,
  • a fixing ring (19) rigidly mounted on the axle pin beneath the bottom of the root portion of the vane when the axle pin is threaded thereinto, said ring extending outwardly from the axle pin and having an aperture therethrough, and

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US435627A 1973-01-22 1974-01-22 Vane with an axle pin for axial impeller wheels Expired - Lifetime US3907460A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK34073*#A DK131829C (da) 1973-01-22 1973-01-22 Skovl med akseltap til aksialbleserhjul

Publications (1)

Publication Number Publication Date
US3907460A true US3907460A (en) 1975-09-23

Family

ID=8092414

Family Applications (1)

Application Number Title Priority Date Filing Date
US435627A Expired - Lifetime US3907460A (en) 1973-01-22 1974-01-22 Vane with an axle pin for axial impeller wheels

Country Status (6)

Country Link
US (1) US3907460A (da)
JP (1) JPS594560B2 (da)
DE (1) DE2401894C2 (da)
DK (1) DK131829C (da)
GB (1) GB1431510A (da)
SE (1) SE387718B (da)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0153529A2 (en) * 1983-10-07 1985-09-04 Nordisk Ventilator Co. A/S A blade with a blade shaft for an impeller of an axial flow fan
US4844696A (en) * 1987-04-10 1989-07-04 Novenco A/S Blade angle control device for use in an axial flow fan the blades of which are adjustable during operation
US10473111B2 (en) 2017-10-18 2019-11-12 Rolls-Royce Corporation Variable pitch fan for a gas turbine engine
US10934866B2 (en) 2017-06-20 2021-03-02 Rolls-Royce North American Technologies Inc. Variable pitch change control method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS543909A (en) * 1977-06-08 1979-01-12 Colchester Woods Improvement of fan
JPH0384862U (da) * 1989-12-20 1991-08-28
DE102007011990B4 (de) * 2007-03-09 2019-01-10 Tlt-Turbo Gmbh Vorrichtung zum hydraulischen Verstellen der Laufschaufeln eines Laufrades eines Axialventilators

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1497723A (en) * 1923-06-04 1924-06-17 Huguenin Albert Water turbine
US2054810A (en) * 1933-12-16 1936-09-22 Gaba Achille Ernest Adjustable pitch propeller
US2844303A (en) * 1952-08-27 1958-07-22 Nordisk Ventilator Axial blowers or fans
US3085631A (en) * 1958-05-29 1963-04-16 Svenska Flaektfabriken Ab Propeller fan blades

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB627258A (en) * 1946-08-27 1949-08-04 Cierva Autogiro Co Ltd Improvements in and relating to controllable pitch axial-flow fans

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1497723A (en) * 1923-06-04 1924-06-17 Huguenin Albert Water turbine
US2054810A (en) * 1933-12-16 1936-09-22 Gaba Achille Ernest Adjustable pitch propeller
US2844303A (en) * 1952-08-27 1958-07-22 Nordisk Ventilator Axial blowers or fans
US3085631A (en) * 1958-05-29 1963-04-16 Svenska Flaektfabriken Ab Propeller fan blades

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0153529A2 (en) * 1983-10-07 1985-09-04 Nordisk Ventilator Co. A/S A blade with a blade shaft for an impeller of an axial flow fan
US4573874A (en) * 1983-10-07 1986-03-04 Nordisk Ventilator Co. A/S Spring biased bayonet coupling for fan blades
EP0153529A3 (en) * 1983-10-07 1986-11-12 Nordisk Ventilator Co. A/S A blade with a blade shaft for an impeller of an axial flow fan
AU579591B2 (en) * 1983-10-07 1988-12-01 A/S Nordisk Ventilator Co. A blade with a blade shaft for an impeller of an axial flow fan
US4844696A (en) * 1987-04-10 1989-07-04 Novenco A/S Blade angle control device for use in an axial flow fan the blades of which are adjustable during operation
US10934866B2 (en) 2017-06-20 2021-03-02 Rolls-Royce North American Technologies Inc. Variable pitch change control method
US10473111B2 (en) 2017-10-18 2019-11-12 Rolls-Royce Corporation Variable pitch fan for a gas turbine engine
US11149741B2 (en) 2017-10-18 2021-10-19 Rolls-Royce Corporation Variable pitch fan for a gas turbine engine

Also Published As

Publication number Publication date
GB1431510A (en) 1976-04-07
JPS594560B2 (ja) 1984-01-30
DE2401894C2 (de) 1982-10-21
SE387718B (sv) 1976-09-13
JPS49109913A (da) 1974-10-19
DK131829C (da) 1976-02-09
DK131829B (da) 1975-09-08
DE2401894A1 (de) 1974-08-01

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