EP0932801B1 - Luftbehandlungsgerät - Google Patents

Luftbehandlungsgerät Download PDF

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Publication number
EP0932801B1
EP0932801B1 EP97944262A EP97944262A EP0932801B1 EP 0932801 B1 EP0932801 B1 EP 0932801B1 EP 97944262 A EP97944262 A EP 97944262A EP 97944262 A EP97944262 A EP 97944262A EP 0932801 B1 EP0932801 B1 EP 0932801B1
Authority
EP
European Patent Office
Prior art keywords
fan
air
guide means
treatment apparatus
air treatment
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
EP97944262A
Other languages
English (en)
French (fr)
Other versions
EP0932801A1 (de
Inventor
Lennart SJÖQVIST
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
UK Secretary of State for Defence
ABB Flaekt 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 UK Secretary of State for Defence, ABB Flaekt AB filed Critical UK Secretary of State for Defence
Publication of EP0932801A1 publication Critical patent/EP0932801A1/de
Application granted granted Critical
Publication of EP0932801B1 publication Critical patent/EP0932801B1/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
    • F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
    • 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
    • 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
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • 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
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/081—Air-flow control members, e.g. louvres, grilles, flaps or guide plates for guiding air around a curve

Definitions

  • the present invention relates to an air treatment apparatus of the type set forth in detail in the preamble of patent claim 1.
  • radial fans particularly radial fans with double suction
  • suck air from a large space i.e. when the fan inlet is not exposed to an adjacent wall or the like
  • certain performances are achieved , which in this context are called nominal performances.
  • the space from which the fan sucks air is limited , often quite limited, because an air treatment apparatus is not supposed to be wide open and/or bulky, need a lot of material when constructed etc.
  • the performances of the fan then become impaired and these worse performances are called installation performances in this context.
  • US-A-3 523 743 and SE-B-430 092 relate to fans having the above-mentioned defects but being provided with guide rails.
  • the inlet side of the fan is not provided with a guide rail and thus, the cause of the rotation formation is not influenced in any way.
  • a guide rail mounted on the outlet or pressure side of the impeller is designed to stabilize the air flow in the fan housing downstream the impeller.
  • a rail guide is to a large extent mounted inside an impeller in order to bring about an alteration of the aerodynamics to make it match particularly well the requirements of an oil burner.
  • an air treatment apparatus which includes housing having a bottom wall, a top wall, a front wall, a rear wall and lateral walls and housing a radial fan having a horizontal fan shaft and a fan inlet, guide means being provided within the housing designed to influence the air, which flows into the fan.
  • the object of the present invention is to minimize the above-mentioned losses and consequently achieve improved fan performances and to reduce the noise generation of the fan.
  • the inventor has discovered, that the phenomena, which result in the above-mentioned performance deterioration, are not only e g a general friction and turbulence, but a great part of the losses is caused by an exceptionally strong air rotation in front of or outside a fan inlet and this rotation is stronger the closer the inlet is positioned to an apparatus wall. Also, the inventor has discovered, that this rotation influences the functioning of the fan in a clearly negative manner, partly as regards the performances and partly as regards pulsations and noise.
  • the inventor has found unexpectedly, when applying the above-mentioned insights, that guide means in more peripheral portions of the air space upstream the fan, namely actually outside the area, where more serious problems occur, result in evident improvements. In this area the speeds are low and a possible tendency to rotation formation can be stopped more easily without the occurrence of appreciable pressure differences across said guide means with resulting loss-causing reliefs. Finally, the inventor has unexpectedly found, that a relatively insignificant control, i.e. of a smaller portion of the air flowing into the apparatus, results in the best total effect with only minimal losses and other inconveniences. In case the flow of air into the fan is symmetrical in all directions, said guide means ought to be radially disposed in order not to prevent the flow of air into the fan.
  • the air substantially flows in one direction and the guide means then substantially ought to be disposed in this direction in order to not prevent the flow of air into the fan. Tests have shown, that the guide means will have the greatest action, provided they are positioned in the air space opposite the side, from which the air flows.
  • the air rotation in front of a fan inlet is minimized and consequently the difference between the nominal performances of the fan and its installation performances is reduced in an interesting way. On an average the losses are halved. Also, the conditions of flow measurement are improved by means of the devices, which are described in SE-B-500 539.
  • guide means according to the invention in the form of a relatively simple guide plate, which in an unexpectedly efficient way prevents the undesired rotation and which consequently markedly improves the performances,the speed and the noise level of the fan.
  • an air treatment apparatus is indicated in its entirety by 1. It includes a housing 2 having a bottom wall 3, a top wall 4, a front wall 5, a rear wall 6 and lateral walls 7 and 8.
  • the apparatus houses a fan 9, which e g is a double-action fan and is driven by a motor 10.
  • the fan has one inlet 11, or two inlets if it is a double-suction fan, and an outlet 12 in rear wall 6.
  • the inlet hole or possibly the inlet holes in the housing, e g in the front wall can be shaped in various ways but is not shown for the sake of clarity.
  • the space outside each fan inlet is indicated by 13 and the path of the air, which flows through this space, is illustrated by arrows 14 and 15 respectively.
  • the air flows through space 13 in the form of substantially straight flow paths according to arrows 15, which paths merely adjacent the fan inlet are bent.
  • guide means 16 preferably plane plates, which suitably have an at least mainly triangular shape, the small sides 17, 18 of the triangle contacting front wall 7 and matching lateral wall 8 respectively.
  • the plate/plates is(are) positioned at least mainly in the same plane as fan shaft 19.
  • small side 18 suitably extends roughly up to the projected extension of the fan shaft, whereas small side 17 extends roughly all the way up to the plane, within which the respective fan inlet is positioned.
  • hypotenuse 20 of the triangle is positioned outside the greater part of space 13, seen in the direction from the fan.
  • space 13 substantially escapes the guide means and consequently is freely available for installation and repair work, possibly measurement and other additional equipment etc. It is of course easy to mount the guide plates in a quick and interchangeable way respectively and even in a deformable way, e g by mounting two or more plates in the form of a laminate, which plates on top of each other can be mutually displaced.
  • the guide plates must not have a triangular shape. They can have any shape They can have a transversal extension in relation to the plane, which goes through the fan shaft, particularly within the area for the respective inner corner in housing 2, soft guiding zones being formed for the air streams along the apparatus walls.
  • Guide plates having the shape shown in the drawings have proved to be unexpectedly efficient, which the diagram in Fig 5 also demonstrates.
  • the unbroken line 21 represents an embodiment without lateral panels, namely without lateral walls 7 and 8, "the large room” thereby being symbolized.
  • Line 22 with large dashes represents an embodiment having lateral walls and line 23 having small dashes represents an embodiment having lateral walls and guide means 16 according to the invention. As appears from the diagram the line with small dashes lies remarkably close to the unbroken line, which represents the ideal design.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Ventilation (AREA)

Claims (8)

  1. Luftbehandlungsvorrichtung (1) umfassend ein Gehäuse (2) mit einem Boden (3), einer Decke (4), einer Vorderwand (5), einer Hinterwand (6) und Seitenwänden (7, 8) sowie umfassend eine Radialgebläse (9) mit einer horizontalen Gebläsewelle (19) und einem Gebläseeinlass (11), wobei Führungsmittel (16) im Gehäuse (2) zur Beeinflussung der in das Gebläse einströmenden Luft vorgesehen sind, dadurch gekennzeichnet, dass genannte Führungsmittel (16) in im wesentlichen peripheren Bereichen eines Luftraumes (13) stromaufwärts des Gebläses (9) angeordnet sind, dass jedes Führungsmittel eine ebene Platte ist, die in genanntem Raum (13) ausserhalb des genannten Gebläseeinlasses (11) angeordnet ist und sich in derselben Ebene erstreckt wie die Gebläsewelle (19), und dass die Führungsmittel ausgeführt und angeordnet sind, um einer Rotation des in genannten Raum (13) einströmenden Luftflusses (15) entgegenzuwirken bzw. eine solche zu verhindern.
  2. Luftbehandlungsvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Radialgebläse (9) ein Gebläse mit doppelter Wirkung ist und daher zwei Gebläseeinlässe (11) besitzt, und dass ein Führungsmittel (16) in genanntem Raum (13) ausserhalb von jedem der genannten Gebläseeinlässe (11) angeordnet ist.
  3. Luftbehandlungsvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Führungsmittel (16) in unmittelbarer Nähe der angrenzenden Hauswand (6) oder Hauswände (6; 8) bzw. im Bereiche einer von diesen gebildeten inneren Ecke eine gewisse geringere Breitenerstreckung in Bezug auf die durch die Gebläsewelle (19) gehende Ebene besitzen, zur Bildung von weichen Einführungszonen für entlang genannter Gehäusewände in die Vorrichtung einströmende Luft.
  4. Luftbehandlungsvorrichtung nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Platte Dreieckform besitzt, wobei die Katheten (17, 18) an der Vorderwand (5) des Gehäuses (2) bzw. an der angrenzenden Seitenwand (7 bzw. 8) anliegen.
  5. Luftbehandlungsvorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die eine Kathete (18) sich etwa bis zur imaginären Verlängerung der Gebläsewelle (19) erstreckt, und/oder dass die andere Kathete (17) sich etwa bis zu der Ebene erstreckt, in welcher der betreffende Gebläseeinlass (11) gelegen ist.
  6. Luftbehandlungsvorrichtung nach wenigstens einem der Ansprüche 1-5, dadurch gekennzeichnet, dass nur ein geringerer Teil der in den Gebläseeinlass einströmenden Luft zur Führung durch genannte Führungsmittel (16) vorgesehen ist, indem genannter Raum (13) frei von genannten Führungsmitteln ist, auch im Hinblick auf die Ebene, in welcher die Führungsmittel (16) angeordnet sind.
  7. Luftbehandlungsvorrichtung nach wenigstens einem der Ansprüche 1-6, dadurch gekennzeichnet, dass genannte Führungsmittel (16) in genanntem Raum (13) auf der entgegengesetzten Seite im Verhältnis zu der Seite angeordnet sind, von welcher die Luft in das Gehäuse (2) bzw. den Einlass oder die Einlässe (11) einströmt.
  8. Luftbehandlungsvorrichtung nach wenigstens einem der Ansprüche 1-7, dadurch gekennzeichnet, dass jede Führungsplatte (16) zur Schnellmontage bzw. austauschbar und/oder formveränderbar ausgeführt bzw. angeordnet ist, unter Anwendung einer Platte, die zwei oder mehr Teil besitzt, welche auf laminatähnliche Art gegeneinander verschiebbar sind.
EP97944262A 1996-10-07 1997-10-06 Luftbehandlungsgerät Expired - Lifetime EP0932801B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9603640A SE507274C2 (sv) 1996-10-07 1996-10-07 Luftbehandlingsaggregat innefattande hus rymmande radialfläkt innefattande styrmedel i form av plåt för att förhindra rotering av inkommande luftström
SE9603640 1996-10-07
PCT/SE1997/001665 WO1998015785A1 (en) 1996-10-07 1997-10-06 Air treatment apparatus

Publications (2)

Publication Number Publication Date
EP0932801A1 EP0932801A1 (de) 1999-08-04
EP0932801B1 true EP0932801B1 (de) 2003-04-09

Family

ID=20404138

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97944262A Expired - Lifetime EP0932801B1 (de) 1996-10-07 1997-10-06 Luftbehandlungsgerät

Country Status (6)

Country Link
EP (1) EP0932801B1 (de)
AU (1) AU4579797A (de)
DE (1) DE69720752D1 (de)
NO (1) NO306524B1 (de)
SE (1) SE507274C2 (de)
WO (1) WO1998015785A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE513398C2 (sv) * 1999-01-13 2000-09-11 Nivell System Ab Luftfördelningsanordning i ett ventilationssystem
US7108478B2 (en) * 2003-06-13 2006-09-19 American Standard International Inc. Blower housing and cabinet with improved blower inlet airflow distribution

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3523743A (en) * 1969-01-16 1970-08-11 Brundage Co Deflector for a centrifugal blower
SE430092B (sv) * 1982-01-21 1983-10-17 Lennart Wallman Anordning vid radialflektar
SE9001508D0 (sv) * 1990-04-26 1990-04-26 Flaekt Ab Method and apparatus for stabilizing the pressure of a centrifugal fan

Also Published As

Publication number Publication date
NO991611L (no) 1999-04-06
DE69720752D1 (de) 2003-05-15
EP0932801A1 (de) 1999-08-04
SE9603640D0 (sv) 1996-10-07
WO1998015785A1 (en) 1998-04-16
NO306524B1 (no) 1999-11-15
AU4579797A (en) 1998-05-05
SE9603640L (sv) 1998-04-08
NO991611D0 (no) 1999-04-06
SE507274C2 (sv) 1998-05-04

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