EP0961087A2 - Spirale für Gebläse - Google Patents

Spirale für Gebläse Download PDF

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Publication number
EP0961087A2
EP0961087A2 EP99630038A EP99630038A EP0961087A2 EP 0961087 A2 EP0961087 A2 EP 0961087A2 EP 99630038 A EP99630038 A EP 99630038A EP 99630038 A EP99630038 A EP 99630038A EP 0961087 A2 EP0961087 A2 EP 0961087A2
Authority
EP
European Patent Office
Prior art keywords
flow path
fan
scroll
cutoff
blower
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
EP99630038A
Other languages
English (en)
French (fr)
Other versions
EP0961087B1 (de
EP0961087A3 (de
Inventor
Shau-Tak R. Chou
Mark A. Daniels
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.)
Carrier Corp
Original Assignee
Carrier Corp
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 Carrier Corp filed Critical Carrier Corp
Publication of EP0961087A2 publication Critical patent/EP0961087A2/de
Publication of EP0961087A3 publication Critical patent/EP0961087A3/de
Application granted granted Critical
Publication of EP0961087B1 publication Critical patent/EP0961087B1/de
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
    • F04D29/40—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/007—Ventilation with forced flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • F24F2013/247—Active noise-suppression

Definitions

  • duct active noise control (ANC) systems are starting to be employed in air distribution systems.
  • An ANC system basically requires the sensing of the noise associated with the fan for distributing air, producing a noise canceling signal and determining the results of the canceling signal so as to provide a correction signal to the loudspeaker.
  • a centrifugal fan discharges into a scroll which provides an expanding flow path for the air passing from the impeller into the scroll.
  • the flow path typically, is expanding radially but may also be expanding axially. It is common to characterize a fan by the angle of the slope of a plot of the variable scroll radius (R) vs the angular or circumferential extent (r ⁇ ), where r is the radius of the fan and ⁇ is the angular extent).
  • the annular extent of the flow path is less than 360°, with 300° being typical. The reasons for this angular extent is the diffusing of the air flow as well as minimizing the space and material needed to make the scroll.
  • the angular extent of a fan scroll flow path which is a radius vector from the fan hub to the scroll such that the radius vector is essentially perpendicular to the flow leaving the fan housing is extended beyond 360° by reducing the rate of radial expansion of the flow path.
  • the increased angular extent of the scroll flow path is in the portion having the greatest radius.
  • r ⁇ 30° angular or circumferential extent
  • length can be added within the scroll portion of the flow path by enlarging the size or cubage of the scroll.
  • the significance of the increased flow path length is that it permits locating the ANC structure wholly within the extent of the scroll while being located a sufficient distance downstream of the impeller to avoid significant flow noise.
  • the rate of expansion within a fan scroll is reduced such that a longer flow path within the scroll is necessary to achieve the desired expansion.
  • the increased flow path length permits the integration of an ANC system with the air handler.
  • the numeral 10 generally designates a conventional AHU with conventional duct ANC structure located in duct 14 which is connected to the discharge of fan 12.
  • the AHU 10 is typically made up of a plurality of sections and/or subassemblies including mixing box 10-1, filter 10-2, coil 10-3 and fan housing 10-4.
  • Fan 12 has a cutoff 12-2 which defines the actual outlet from scroll 12-1 but, as is conventional, the outlet defined at the cutoff discharges into the larger duct 14.
  • expansion of the flow is allowed to take place in the duct 14 for a distance equal to three times the diameter of blower 12-3. In that distance the turbulence associated with the fan discharge diminishes along with the associated difficulties with locating sensing microphones 16 in a region where considerable flow generated noise is present.
  • a typical duct ANC system for large air distribution systems can require a ten foot spacing to accommodate the input noise sensing microphones(s) 16, the noise canceling speaker(s) 18 and the error sensing microphone(s) 20.
  • blower 12-3 is driven by motor 13 thereby drawing return and makeup air into the AHU 10, through a heat exchanger defined by coil 10-3 to heat or cool the air and delivering the resultant conditioned air from scroll 12-1 into duct 14.
  • the fan noises are sensed by microphone(s) 16 and through circuitry (not illustrated), speaker(s) 18 is (are) driven to produce a signal to cancel the fan noise.
  • Microphone(s) 20 sense the result of the noise cancellation by speaker(s) 18 and through circuitry (not illustrated) the output of speaker(s) 18 is corrected such that sound energy is minimized at microphone(s) 20..
  • the air is discharged from clockwise rotating blower 12-3 into the space 12-4 between blower 12-3 and scroll 12-1.
  • the space 12-4 is of increasing cross sectional area in a clockwise direction such that the air is permitted to expand as it travels along space 12-4 towards the fan outlet 12-5.
  • cutoff 12-2 defining one end of the space 12-4 it will be noted that space 12-4 is less than 360° in extent.
  • Blower 12-3 has a radius r and is spaced from cutoff 12-2 a distance d such that the radius, R, of scroll 12-1 is r+d at cutoff 12-2.
  • the angular extent, ⁇ , of scroll 12-1 is measured clockwise, as viewed in Figure 2, from cutoff 12-2 and, typically, is on the order of 300°.
  • the radius R and space 12-4 increase with ⁇ in going clockwise from cutoff 12-2 towards fan outlet 12-5.
  • the radius R increases to its maximum value R o at the fan discharge.
  • r+d represents the radius R of scroll 12-1 at cutoff 12-2 or the radius of scroll 112-1 at cutoff 112-2.
  • a typical value of ⁇ 1 would be 300°.
  • a typical value of ⁇ 2 would be 450° which would represent approximately a five foot increase of r ⁇ 2 relative to r ⁇ 1 for a two foot radius.
  • a typical value of ⁇ 2 would be from 4° to 10°. Note that while a scroll with a linear expansion is used for purposes of illustration, other expansions can be used.
  • the numeral 112 designates the modified fan of the present invention.
  • the cutoff has been effectively shifted counterclockwise such that the rate of radial expansion, ⁇ 2 , of space 112-4 is less than the corresponding rate of radial expansion, ⁇ 1 , of space 12-4.
  • the angular extent ⁇ from the point of closest proximity between blower 112-3 and cutoff 112-2 and the outlet 112-5 is, as illustrated, on the order of 180° greater than that for fan 12 i.e. ⁇ is at least 400° but, preferably on the order of 480°.
  • the present invention uses the increased circumferential extent to locate the ANC structure which is then sufficiently far along the flow path in the scroll 112-1.
  • the slow rate of expansion in scroll 112-1 as compared to scroll 12-1 provides a longer flow path within the same cubage. If the cubage is increased in combination with the slow rate of expansion, the flow path length can be further increased. Because the increased length is in the nature of a spiral, the portion of the flow path beyond 360° is radially separated from the upstream portion of the flow path rather than being axially separated. Accordingly, all or portions of the scroll flow path may be provided with an acoustic damping liner.
  • sensing microphone(s) 16 is (are) located at a location, nominally, 360° along the flow path such that they are ahead of or directly opposite the fan cutoff 12-2. Sensing microphone(s) 16 can be located further upstream, e.g. 300° along the flow path since angular extent is only one component of the parameters dictating flow path length. Speakers 18 are located downstream of microphone(s) 16, as illustrated, nominally, 120° further along the flow path. Since the microphone 16 location can be varied, speakers 18 may also be moved upstream with 400° along the flow path being at the lower acceptable range. At a nominal two foot diameter the 120° translates into about four feet downstream of the microphone(s) 16.
  • Microphone(s) 20 can be located downstream of the blower 112-3 in the duct (not illustrated) such that they are in the same plane or downstream of loudspeaker(s) 18. If necessary, or desired, the speaker(s) 18 can be located in the duct (not illustrated) while taking advantage of the space saving features associated with locating microphone(s) 16 in or on scroll 112-1.
EP19990630038 1998-05-26 1999-04-16 Spirale für Gebläse Expired - Lifetime EP0961087B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8446498P 1998-05-26 1998-05-26
US84464 1998-05-26

Publications (3)

Publication Number Publication Date
EP0961087A2 true EP0961087A2 (de) 1999-12-01
EP0961087A3 EP0961087A3 (de) 2003-01-08
EP0961087B1 EP0961087B1 (de) 2004-11-24

Family

ID=22185125

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19990630038 Expired - Lifetime EP0961087B1 (de) 1998-05-26 1999-04-16 Spirale für Gebläse

Country Status (3)

Country Link
EP (1) EP0961087B1 (de)
DE (1) DE69922083T2 (de)
ES (1) ES2230824T3 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1703139A1 (de) * 2005-03-14 2006-09-20 ebm-papst Landshut GmbH Radialgebläse
WO2007062889A2 (de) * 2005-11-30 2007-06-07 Siemens Aktiengesellschaft Gasströmungserzeuger mit einem gasauslass und mit einem störschallreduzierer und verfahren zur störschallreduzierung
EP2594853A1 (de) 2011-11-21 2013-05-22 Ask Industries Societa' per Azioni Dampfabzugshaube mit geringer Geräuschentwicklung
US9508337B2 (en) 2013-05-17 2016-11-29 Ask Industries Societa Per Azioni Low-noise fume extractor hood

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4182596A (en) * 1978-02-16 1980-01-08 Carrier Corporation Discharge housing assembly for a vane axial fan
US5156524A (en) * 1990-10-26 1992-10-20 Airflow Research And Manufacturing Corporation Centrifugal fan with accumulating volute
WO1993002445A1 (en) * 1991-07-16 1993-02-04 Noise Cancellation Technologies, Inc. High efficiency fan with adaptive noise cancellation
US5279515A (en) * 1992-12-21 1994-01-18 American Standard Inc. Air handling unit with improved acoustical performance
EP0596846A1 (de) * 1992-11-03 1994-05-11 Aktiebolaget Electrolux Küchenventilator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4182596A (en) * 1978-02-16 1980-01-08 Carrier Corporation Discharge housing assembly for a vane axial fan
US5156524A (en) * 1990-10-26 1992-10-20 Airflow Research And Manufacturing Corporation Centrifugal fan with accumulating volute
WO1993002445A1 (en) * 1991-07-16 1993-02-04 Noise Cancellation Technologies, Inc. High efficiency fan with adaptive noise cancellation
EP0596846A1 (de) * 1992-11-03 1994-05-11 Aktiebolaget Electrolux Küchenventilator
US5279515A (en) * 1992-12-21 1994-01-18 American Standard Inc. Air handling unit with improved acoustical performance

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1703139A1 (de) * 2005-03-14 2006-09-20 ebm-papst Landshut GmbH Radialgebläse
WO2007062889A2 (de) * 2005-11-30 2007-06-07 Siemens Aktiengesellschaft Gasströmungserzeuger mit einem gasauslass und mit einem störschallreduzierer und verfahren zur störschallreduzierung
WO2007062889A3 (de) * 2005-11-30 2007-07-26 Siemens Ag Gasströmungserzeuger mit einem gasauslass und mit einem störschallreduzierer und verfahren zur störschallreduzierung
EP2594853A1 (de) 2011-11-21 2013-05-22 Ask Industries Societa' per Azioni Dampfabzugshaube mit geringer Geräuschentwicklung
US9508337B2 (en) 2013-05-17 2016-11-29 Ask Industries Societa Per Azioni Low-noise fume extractor hood

Also Published As

Publication number Publication date
EP0961087B1 (de) 2004-11-24
DE69922083D1 (de) 2004-12-30
EP0961087A3 (de) 2003-01-08
DE69922083T2 (de) 2005-03-31
ES2230824T3 (es) 2005-05-01

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