EP0466983A1 - Geräuschunterdrückung - Google Patents

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Publication number
EP0466983A1
EP0466983A1 EP90307734A EP90307734A EP0466983A1 EP 0466983 A1 EP0466983 A1 EP 0466983A1 EP 90307734 A EP90307734 A EP 90307734A EP 90307734 A EP90307734 A EP 90307734A EP 0466983 A1 EP0466983 A1 EP 0466983A1
Authority
EP
European Patent Office
Prior art keywords
fan
blades
housing
formations
spaced apart
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Withdrawn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
EP90307734A
Other languages
English (en)
French (fr)
Inventor
Steven Anthony Ashton
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.)
CROSSLEE PLC
Original Assignee
CROSSLEE PLC
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 CROSSLEE PLC filed Critical CROSSLEE PLC
Priority to EP90307734A priority Critical patent/EP0466983A1/de
Publication of EP0466983A1 publication Critical patent/EP0466983A1/de
Withdrawn legal-status Critical Current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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/422—Discharge tongues
    • 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
    • F04D29/663—Sound attenuation
    • F04D29/665—Sound attenuation by means of resonance chambers or interference

Definitions

  • This invention relates to noise suppression.
  • the invention has been specifically developed to suppress noise in the fans of tumble dryers, but the principle of the invention is of wider application.
  • Tumble dryers are of course generally operated in the home, and it is highly undesirable for the machines to be noisy.
  • the rotating drum of a tumble dryer runs at low speed and can be mounted in bearings which reduce noise and furthermore the drum operates within an outer casing which provides sound insulation.
  • One known solution to the problem consists of providing a resonance chamber between the fan and the outlet of the machine. If the dimensions of the chamber are correctly chosen, the chamber produces a sound wave which is 180° out of phase with the fan noise and this suppresses the noise.
  • the use of a resonance chamber has two additional problems associated with it. Firstly, the resonance chamber takes up a significant amount of space, and secondly, any chamber of given dimensions will only operate successfully with the fan moving at a particular speed.
  • a fan rotatably mounted in a housing and having a plurality of blades is characterised in that the fan and housing are arranged to co-operate such that rotation of the fan generates two sound waves which are out of phase and hence tend to cancel out.
  • the housing has two formations which are spaced apart, passage of the fan blades past the two formations causing the generation of the two sound waves.
  • One formation conveniently comprises an edge of an outlet of the housing.
  • the other formation preferably comprises a rib or other projection.
  • the formations are preferably spaced apart by a distance which is equal to P x n + 1 2 P, where P is the pitch of the fan blades and n is a whole number.
  • the formations are spaced apart by a distance which is equal to half the pitch of the fan blades or 1 times the pitch of the fan blades, i.e. n is equal to zero or one.
  • the invention includes a rotary machine fitted with a fan according to the invention.
  • the invention particularly includes a tumble dryer fitted with a fan according to the invention.
  • the fan shown in Figure 1 has been specifically developed for use with a gas heated tumble dryer. Because of the larger heat input possible in a gas heated dryer, a greater air-flow is required than with an electrically heated dryer and so it is necessary to use a two pole motor rather than a four pole motor.
  • FIG. 1 The majority of what is shown in Figure 1 is conventional. There is a fan housing 10 which defines a volute 11 having an outlet 12. Mounted for rotation within the housing 10, about an axis 13, is the fan 14. The fan has a plurality of blades 15 spaced apart around its periphery.
  • the projection has a face directed towards the blades which extends substantially radially with respect to the fan. This is supported by a ramp-like or wedge- like rear face.
  • the angular distance B between the formations is equal to half the angular pitch of the blades.
  • the movement of the blades past the second formation 17 produces a second sound wave which is out of phase by half a pitch and hence the two sound waves tend to cancel out.
  • angular pitch B could, for example be 1 times the angular pitch A.
  • the solution is still effective because the two sound waves change in frequency by the same amount, but remain exactly half a pitch out of phase.
  • FIGs 2 and 3 show a tumble dryer according to the invention, fitted with a fan of the kind shown in Figure 1.
  • the tumble dryer has a generally rectangular outer casing 18 containing a rotatable drum 19, access to which is gained through a circular front door 20.
  • the drum is rotatable about a bearing 21 by means of a motor 22.
  • the motor 22 also drives the fan 14 by means of a shaft 23.
  • the fan draws air in from outside the dryer through an inlet 24 and expels the air through an outlet 25.
  • the fan has an outside diameter of 150 mm, the smallest radius of the volute 11 is 82 mm and the height of the projection 17 is 3 mm. There are twenty blades. Other dimensions and configurations are of course possible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP90307734A 1990-07-16 1990-07-16 Geräuschunterdrückung Withdrawn EP0466983A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP90307734A EP0466983A1 (de) 1990-07-16 1990-07-16 Geräuschunterdrückung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP90307734A EP0466983A1 (de) 1990-07-16 1990-07-16 Geräuschunterdrückung

Publications (1)

Publication Number Publication Date
EP0466983A1 true EP0466983A1 (de) 1992-01-22

Family

ID=8205493

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90307734A Withdrawn EP0466983A1 (de) 1990-07-16 1990-07-16 Geräuschunterdrückung

Country Status (1)

Country Link
EP (1) EP0466983A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993014320A1 (en) * 1992-01-13 1993-07-22 Fasco Industries, Inc. Noise cancellation device for centrifugal blower
DE4230014C1 (de) * 1992-09-08 1994-03-24 Eberspaecher J Vorrichtung zur Reduzierung der Geräuschentwicklung bei Gebläsen
US5419680A (en) * 1992-11-25 1995-05-30 Nippondenso Co., Ltd. Multi-blade blower
EP0947705A2 (de) * 1998-04-02 1999-10-06 Ford Motor Company Radiallüftergehaüse
US6050772A (en) * 1995-08-28 2000-04-18 Toto Ltd. Method for designing a multiblade radial fan and a multiblade radial fan
EP2107251A1 (de) * 2008-04-02 2009-10-07 Behr GmbH & Co. KG Gebläsegehäuse

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1428130A1 (de) * 1964-10-03 1968-11-28 Ernst Heinkel Ag Geblaese,insbesondere Tangentialgeblaese
FR2266016A1 (de) * 1974-03-26 1975-10-24 Int Standard Electric Corp
US3963370A (en) * 1974-10-16 1976-06-15 General Electric Company Laundry machine blower mechanism
EP0039459A1 (de) * 1980-04-28 1981-11-11 DEUTSCHE FORSCHUNGSANSTALT FÜR LUFT- UND RAUMFAHRT e.V. Geräuscharme Turbo-Arbeitsmaschine
EP0175229A2 (de) * 1984-09-21 1986-03-26 Heidolph-Elektro GmbH & Co. KG Querstromgebläse

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1428130A1 (de) * 1964-10-03 1968-11-28 Ernst Heinkel Ag Geblaese,insbesondere Tangentialgeblaese
FR2266016A1 (de) * 1974-03-26 1975-10-24 Int Standard Electric Corp
US3963370A (en) * 1974-10-16 1976-06-15 General Electric Company Laundry machine blower mechanism
EP0039459A1 (de) * 1980-04-28 1981-11-11 DEUTSCHE FORSCHUNGSANSTALT FÜR LUFT- UND RAUMFAHRT e.V. Geräuscharme Turbo-Arbeitsmaschine
EP0175229A2 (de) * 1984-09-21 1986-03-26 Heidolph-Elektro GmbH & Co. KG Querstromgebläse

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 120 (M-580)(2567) 15 April 1987, & JP-A-61 261699 (NIPPON) 19 November 1986, *
PATENT ABSTRACTS OF JAPAN vol. 11, no. 336 (M-638)(2783) 04 November 1987, & JP-A-62 118095 (MATSUSHITA ELECTRIC) 29 May 1987, *
PATENT ABSTRACTS OF JAPAN vol. 4, no. 37 (M-4)(519) 27 March 1980, & JP-A-55 10067 (MITSUBISHI) 24 January 1980, *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993014320A1 (en) * 1992-01-13 1993-07-22 Fasco Industries, Inc. Noise cancellation device for centrifugal blower
US5316439A (en) * 1992-01-13 1994-05-31 Fasco Industries, Inc. Noise cancellation device for centrifugal blower
DE4230014C1 (de) * 1992-09-08 1994-03-24 Eberspaecher J Vorrichtung zur Reduzierung der Geräuschentwicklung bei Gebläsen
US5419680A (en) * 1992-11-25 1995-05-30 Nippondenso Co., Ltd. Multi-blade blower
US6050772A (en) * 1995-08-28 2000-04-18 Toto Ltd. Method for designing a multiblade radial fan and a multiblade radial fan
EP0947705A2 (de) * 1998-04-02 1999-10-06 Ford Motor Company Radiallüftergehaüse
EP0947705A3 (de) * 1998-04-02 2001-01-24 Ford Motor Company Radiallüftergehaüse
EP2107251A1 (de) * 2008-04-02 2009-10-07 Behr GmbH & Co. KG Gebläsegehäuse

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