EP0837246A2 - Boítier d'un ventilateur pour l'alimentation en air d'un système de ventilation - Google Patents

Boítier d'un ventilateur pour l'alimentation en air d'un système de ventilation Download PDF

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Publication number
EP0837246A2
EP0837246A2 EP97850137A EP97850137A EP0837246A2 EP 0837246 A2 EP0837246 A2 EP 0837246A2 EP 97850137 A EP97850137 A EP 97850137A EP 97850137 A EP97850137 A EP 97850137A EP 0837246 A2 EP0837246 A2 EP 0837246A2
Authority
EP
European Patent Office
Prior art keywords
impeller
fan housing
wall
housing according
end edge
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Withdrawn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
EP97850137A
Other languages
German (de)
English (en)
Other versions
EP0837246A3 (fr
Inventor
Gunnar Berg
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.)
PM-Luft AB
PM Luft
Original Assignee
PM-Luft AB
PM Luft
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 PM-Luft AB, PM Luft filed Critical PM-Luft AB
Publication of EP0837246A2 publication Critical patent/EP0837246A2/fr
Publication of EP0837246A3 publication Critical patent/EP0837246A3/fr
Withdrawn legal-status Critical Current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
    • F04D29/66—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
    • F04D29/664—Sound attenuation by means of sound absorbing material
    • 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
    • F04D29/4226—Fan casings
    • F04D29/424—Double entry casings

Definitions

  • the present invention relates to a fan housing for feeding air to a ventilation system, comprising a radial impeller rotatably mounted to a shaft which wheel has one centrally arranged inlet and a number of impeller blades and having a wall being substantially parallel to the rotational shaft which wall is curved with a monotonous increasing radius in relation to said shaft, between a first end edge at a certain distance from said impeller and a second end edge at a larger distance from said impeller.
  • Fans for ventilation systems are normally provided with a shell shaped fan housing, which cooperates with the impeller to provide a high efficiency, i.e., a high total pressure (static pressure + dynamic pressure) in relation to the driving force added.
  • a high efficiency i.e., a high total pressure (static pressure + dynamic pressure) in relation to the driving force added.
  • static pressure + dynamic pressure a high total pressure
  • fans creates a high noise level, which is transported away in the ventilation system if no noise suppressing measures are taken.
  • a normal means is to place one or more silencer in the canal system before and after the fan. Silencing measures are space demanding, lead to an increased fall of pressure in the ventilation system, and lead to increased investment costs.
  • a substantial part of the noise created relates to the pulses of pressure created when the impeller blades passes the first end edge of the wall. These pressure pulses are acoustically intensified by the funnel shaped outlet and are transported further on in the ventilation system if no necessary sound suppressing is made.
  • the object of the present invention is to obtain a fan housing for a ventilation system which creates less pressure losses and which creates less noise than a corresponding, known fan housing.
  • the invention is characterized in that an imagined straight line between the two end edges extends through the impeller.
  • the pressure pulses from the impeller blades will be reduced to a considerable extent.
  • the fan housing lacks the funnel shaped outlet.
  • the fan housing shown in the drawing is intended to feed air via an outlet 14 defined by four walls 10 to 13, to a ventilation system not shown.
  • the fan housing comprises a double-sided radially working impeller 16 being rotatable driven by a shaft 15 which wheel has two central inlets 17, and a number of impeller blades 18 on each side of a centre wall 19.
  • the fan housing comprises a wall 20 being substantially parallel to the rotational axis, which wall is curved between a first end edge 21 and a second end edge 22.
  • the bend of the wall is done in such a way that the wall has a monotonous increasing radius distance in relation to the shaft 15.
  • the distance between the outer radius of the impeller and the first end edge 21 is less than the corresponding distance to the other end edge 22.
  • the straight line 23 passes through the impeller in the vicinity of the rotational axis 15, between the wall 20 and the outlet 14 ofthe fan housing.
  • the wall is provided with a silencing material 24 on the on the side facing away from the impeller 16.
  • the wall is totally formed by a mould casting of the silencing material, which can be made of stone wool, glass wool, or of a foamed plastic, e g., polyurethane.
  • the wall surface is preferably protected by means of a perforated steel sheet (not shown in the drawing), whereby the polymer material forms a supporting body of the perforated steel sheet.
  • a perforated steel sheet not shown in the drawing
  • the outlet 14 is larger than those of corresponding conventional shell shaped fan housings, a lower exit speed is obtained which leads to a larger proportion of static pressure and lower pressure losses. It has now surprisingly been shown that using the fan housing of the invention a higher flow at lower pressures are obtained than of the corresponding conventional fan housings.
  • the ventilation channels can be made short and need not comprise any silencing element. Thus the pressure fall is reduced in the ventilation system and one needs not to dimension the fans/fan housing to resist high working pressures.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP97850137A 1996-10-15 1997-10-14 Boítier d'un ventilateur pour l'alimentation en air d'un système de ventilation Withdrawn EP0837246A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9603762A SE9603762L (sv) 1996-10-15 1996-10-15 Fläkthus för matning av luft till ett ventitlationssystem
SE9603762 1996-10-15

Publications (2)

Publication Number Publication Date
EP0837246A2 true EP0837246A2 (fr) 1998-04-22
EP0837246A3 EP0837246A3 (fr) 1998-11-18

Family

ID=20404248

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97850137A Withdrawn EP0837246A3 (fr) 1996-10-15 1997-10-14 Boítier d'un ventilateur pour l'alimentation en air d'un système de ventilation

Country Status (2)

Country Link
EP (1) EP0837246A3 (fr)
SE (1) SE9603762L (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1070851A2 (fr) * 1999-07-23 2001-01-24 Behr GmbH & Co. Soufflante
EP1420168A1 (fr) * 2002-11-18 2004-05-19 Sanden Corporation Soufflante radiale
WO2007033184A1 (fr) * 2005-09-13 2007-03-22 American Standard International Inc. Ventilateur centrifuge d’appareil de traitement d’air

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB926088A (en) * 1960-11-08 1963-05-15 Brightside Heating & Engineeri Improvements relating to centrifugal fans
DE1403496A1 (de) * 1961-07-01 1969-01-30 Daimler Benz Ag Kuehl- oder Heissluftgeblaese
US3312389A (en) * 1964-05-04 1967-04-04 Fukuo Saeki Air blower device with silencer
US3485443A (en) * 1968-12-12 1969-12-23 Trane Co Fan scroll
DE7129939U (de) * 1971-08-04 1977-03-24 Papst - Motoren Kg, 7742 St Georgen Lüfter, insbesondere Tischlüfter
CH574053A5 (fr) * 1972-03-03 1976-03-31 Ltg Lufttechnische Gmbh
US3950835A (en) * 1974-10-02 1976-04-20 Carrier Corporation Fan assembly and method of manufacturing same
DE3151386A1 (de) * 1981-12-24 1983-07-14 FSL Fenster-System-Lüftung GmbH, 6800 Mannheim Geblaese, insbesondere einbaugeblaese

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1070851A2 (fr) * 1999-07-23 2001-01-24 Behr GmbH & Co. Soufflante
EP1070851A3 (fr) * 1999-07-23 2002-04-17 Behr GmbH & Co. Soufflante
EP1420168A1 (fr) * 2002-11-18 2004-05-19 Sanden Corporation Soufflante radiale
WO2007033184A1 (fr) * 2005-09-13 2007-03-22 American Standard International Inc. Ventilateur centrifuge d’appareil de traitement d’air

Also Published As

Publication number Publication date
EP0837246A3 (fr) 1998-11-18
SE9603762D0 (sv) 1996-10-15
SE9603762L (sv) 1998-04-16

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