EP1397596A1 - Rotating appliance with balance holes - Google Patents

Rotating appliance with balance holes

Info

Publication number
EP1397596A1
EP1397596A1 EP02751203A EP02751203A EP1397596A1 EP 1397596 A1 EP1397596 A1 EP 1397596A1 EP 02751203 A EP02751203 A EP 02751203A EP 02751203 A EP02751203 A EP 02751203A EP 1397596 A1 EP1397596 A1 EP 1397596A1
Authority
EP
European Patent Office
Prior art keywords
lightening holes
holes
blade wheel
appliance
balancing
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Withdrawn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
EP02751203A
Other languages
German (de)
French (fr)
Inventor
Juhani Hyvärinen
Sami Wainio
Ilkka T. Ikonen
Kimmo Forsman
Matti PÖYHÖNEN
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.)
Flaekt Woods AB
Original Assignee
Flaekt Woods AB
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 Flaekt Woods AB filed Critical Flaekt Woods AB
Publication of EP1397596A1 publication Critical patent/EP1397596A1/en
Withdrawn legal-status Critical Current

Links

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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/662—Balancing of rotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/32—Correcting- or balancing-weights or equivalent means for balancing rotating bodies, e.g. vehicle wheels
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M1/00—Testing static or dynamic balance of machines or structures
    • G01M1/30—Compensating imbalance
    • G01M1/32—Compensating imbalance by adding material to the body to be tested, e.g. by correcting-weights

Definitions

  • the present invention relates to a rotary appliance, such as an impeller, as defined in the preamble of claim 1 , comprising a rotating plastic component, such as a fan blade wheel, provided with lightening holes and rotated by a drive apparatus, such as an electric motor.
  • a plastic casting such as a fan blade wheel cast from a plastic material, should not have material thicknesses exceeding a certain limit to avoid developing pro- cess-time stresses in the material. They can cause undesirable deformations and result in a structure having less than the designed strength.
  • plastic castings are provided with lightening holes designed to keep material concentrations sufficiently small.
  • rotating parts e.g. a fan blade wheel
  • rotating parts e.g. a fan blade wheel
  • the material added for balancing is attached to the outside of the body, or suitable holes are first drilled for the weights, which are then added to the holes.
  • the attachment of accessories is likewise implemented using separate mounting holes or equivalent. This requires extra work and is therefore difficult and time-consuming.
  • the object of the present invention is to eliminate the drawbacks of prior art and to achieve a new type of lightening holes in a plastic rotating part comprised in a rotary appliance, such as an air impeller.
  • the invention is based on the idea of designing the lightening holes so that they are also applicable for use for the balancing weights needed for balancing, so that the balancing weights can be placed in the lightening holes. It is also possible to place e.g. an accessory needed for a fan blade wheel in the same slots if the impeller wheel is to be implemented as a model differing from the standard model, the accessory being used e.g. to change the air flow in a desired manner.
  • the primary advantage of the invention is that the lightening holes of the invention reduce the manufacturing costs and accelerate the manufacturing process as the lightening holes can be used for balancing and for mounting accessories, which means that it is not necessary to make separate holes for these.
  • Fig. 1 presents the blade wheel of an axial fan, provided with lightening holes according to the invention
  • Fig. 2 presents a more detailed view of the lightening holes
  • Fig. 3 illustrates the attachment of an accessory to the blade wheel.
  • Fig. 1 presents a cast plastic blade wheel 10, which is fitted to the body of an axial fan by means of a shaft journal provided in it, the blade wheel being rotated by an electric motor.
  • the blade wheel comprises fan blades 11 fitted between an inner cylindrical part 12 and a second outer cylindrical annular part 13, and a hole 14 for a shaft at the center.
  • the stator of the motor of the axial fan may be mounted on the housing around the perimeter of the impeller wheel 10 while the rotor is integrated with the impeller wheel so that it consists of permanent magnets fitted on the circumference of the outer annular part 13.
  • the magnets may have a curved shape, so they can be placed in slots 15 provided at the very circumference of the blade wheel 10 and no plastic or other insulating material is needed between it and the stator.
  • the outer annular part 13 is provided with longitudinal lightening holes 16, which serve to ensure that material concentrations in the cast-plastic blade wheel remain sufficiently small.
  • the lightening holes are so designed that they are also applicable for use for the balancing weights needed for balancing, so that the balancing weights can be placed in the lightening holes. These may have a depth almost equal to the thickness of the annular part 13 as in Fig. 2.
  • an accessory 17 needed on the impeller blade wheel to change the air flow so that the axial fan becomes e.g. a mixed-flow fan can be fastened to the same holes by means of mounting pins provided in the accessory and fitted to the lightening holes 16. It is obvious to the person skilled in the art that different embodiments of the invention are not limited to the example described above, but that they may be varied within the scope of the following claims. Thus, the invention can also be used in other rotary appliances in which the rotating part is shaped via a casting process in a mould.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A rotary appliance, such as a fan, comprising a cast-plastic rotating part, such as a fan blade wheel, rotated by a drive apparatus, such as an electric motor, said blade wheel being provided with lightening holes especially to keep material concentrations sufficiently small. The lightening holes (16) are so arranged that they also serve as mounting holes for the balancing weights needed for balancing so that the balancing weights can be placed in the lightening holes, and/or as mounting holes for an accessory fitted on the appliance.

Description

ROTATING APPLIANCE WITH BALANCE HOLES
The present invention relates to a rotary appliance, such as an impeller, as defined in the preamble of claim 1 , comprising a rotating plastic component, such as a fan blade wheel, provided with lightening holes and rotated by a drive apparatus, such as an electric motor.
A plastic casting, such as a fan blade wheel cast from a plastic material, should not have material thicknesses exceeding a certain limit to avoid developing pro- cess-time stresses in the material. They can cause undesirable deformations and result in a structure having less than the designed strength. To prevent this, plastic castings are provided with lightening holes designed to keep material concentrations sufficiently small. After the casting, rotating parts, e.g. a fan blade wheel, have to be balanced. This can be accomplished by adding heavy material, e.g. lead, to the plastic body. At present, the material added for balancing is attached to the outside of the body, or suitable holes are first drilled for the weights, which are then added to the holes. At present, the attachment of accessories is likewise implemented using separate mounting holes or equivalent. This requires extra work and is therefore difficult and time-consuming.
The object of the present invention is to eliminate the drawbacks of prior art and to achieve a new type of lightening holes in a plastic rotating part comprised in a rotary appliance, such as an air impeller.
The invention is based on the idea of designing the lightening holes so that they are also applicable for use for the balancing weights needed for balancing, so that the balancing weights can be placed in the lightening holes. It is also possible to place e.g. an accessory needed for a fan blade wheel in the same slots if the impeller wheel is to be implemented as a model differing from the standard model, the accessory being used e.g. to change the air flow in a desired manner.
Details of the features characteristic of the lightening holes of the invention are presented in the claims below.
The primary advantage of the invention is that the lightening holes of the invention reduce the manufacturing costs and accelerate the manufacturing process as the lightening holes can be used for balancing and for mounting accessories, which means that it is not necessary to make separate holes for these.
In the following, the invention will be described in detail by the aid of an exam- pie with reference to the attached drawings, wherein
Fig. 1 presents the blade wheel of an axial fan, provided with lightening holes according to the invention,
Fig. 2 presents a more detailed view of the lightening holes, and
Fig. 3 illustrates the attachment of an accessory to the blade wheel.
Fig. 1 presents a cast plastic blade wheel 10, which is fitted to the body of an axial fan by means of a shaft journal provided in it, the blade wheel being rotated by an electric motor. The blade wheel comprises fan blades 11 fitted between an inner cylindrical part 12 and a second outer cylindrical annular part 13, and a hole 14 for a shaft at the center.
The stator of the motor of the axial fan may be mounted on the housing around the perimeter of the impeller wheel 10 while the rotor is integrated with the impeller wheel so that it consists of permanent magnets fitted on the circumference of the outer annular part 13. The magnets may have a curved shape, so they can be placed in slots 15 provided at the very circumference of the blade wheel 10 and no plastic or other insulating material is needed between it and the stator.
The outer annular part 13 is provided with longitudinal lightening holes 16, which serve to ensure that material concentrations in the cast-plastic blade wheel remain sufficiently small. The lightening holes are so designed that they are also applicable for use for the balancing weights needed for balancing, so that the balancing weights can be placed in the lightening holes. These may have a depth almost equal to the thickness of the annular part 13 as in Fig. 2.
Likewise, an accessory 17 needed on the impeller blade wheel to change the air flow so that the axial fan becomes e.g. a mixed-flow fan can be fastened to the same holes by means of mounting pins provided in the accessory and fitted to the lightening holes 16. It is obvious to the person skilled in the art that different embodiments of the invention are not limited to the example described above, but that they may be varied within the scope of the following claims. Thus, the invention can also be used in other rotary appliances in which the rotating part is shaped via a casting process in a mould.

Claims

1. Rotary appliance, such as a fan, comprising a cast-plastic rotating part (10), such as a fan blade wheel, rotated by a drive apparatus, such as an electric motor, said blade wheel being provided with lightening holes especially to keep material concentrations sufficiently small, characterized in that the lightening holes (16) are so arranged that they also serve as mounting holes for the balancing weights needed for balancing so that the balancing weights can be placed in the lightening holes, and/or as mounting holes for an accessory to be fitted on the appliance.
2. Lightening holes according to claim 1 , arranged in the longitudinal direction of the rotating part, characterized in that the lightening holes have a depth nearly equal to the thickness of the rotating part.
EP02751203A 2001-06-18 2002-06-18 Rotating appliance with balance holes Withdrawn EP1397596A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20011286 2001-06-18
FI20011286A FI20011286A0 (en) 2001-06-18 2001-06-18 Rotary actuator with lightening cavities
PCT/FI2002/000529 WO2002103207A1 (en) 2001-06-18 2002-06-18 Rotating appliance with balance holes

Publications (1)

Publication Number Publication Date
EP1397596A1 true EP1397596A1 (en) 2004-03-17

Family

ID=8561432

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02751203A Withdrawn EP1397596A1 (en) 2001-06-18 2002-06-18 Rotating appliance with balance holes

Country Status (4)

Country Link
EP (1) EP1397596A1 (en)
KR (1) KR20040012906A (en)
FI (1) FI20011286A0 (en)
WO (1) WO2002103207A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105782111A (en) * 2016-05-06 2016-07-20 浙江希尔富电气有限公司 Blowing type wind wheel of brushless fan
CN105805045A (en) * 2016-05-06 2016-07-27 浙江希尔富电气有限公司 Air sucking type wind wheel of brushless draught fan

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4136293B4 (en) * 1990-11-03 2004-08-26 Papst Licensing Gmbh & Co. Kg Impeller for a blower, especially a radial blower
JPH05141392A (en) * 1991-11-21 1993-06-08 Matsushita Electric Ind Co Ltd Air blower impeller and balance correcting method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02103207A1 *

Also Published As

Publication number Publication date
WO2002103207A1 (en) 2002-12-27
FI20011286A0 (en) 2001-06-18
KR20040012906A (en) 2004-02-11

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