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WO2001098668A1 - Assemblage de guidage d'une grande unite soufflante - Google Patents

Assemblage de guidage d'une grande unite soufflante Download PDF

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Publication number
WO2001098668A1
WO2001098668A1 PCT/DK2000/000329 DK0000329W WO0198668A1 WO 2001098668 A1 WO2001098668 A1 WO 2001098668A1 DK 0000329 W DK0000329 W DK 0000329W WO 0198668 A1 WO0198668 A1 WO 0198668A1
Authority
WO
WIPO (PCT)
Prior art keywords
impeller
suction box
inlet
guiding arrangement
tubular body
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.)
Ceased
Application number
PCT/DK2000/000329
Other languages
English (en)
Inventor
Henrik Bagger
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.)
Howden Power AS
Original Assignee
Howden Power AS
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 Howden Power AS filed Critical Howden Power AS
Priority to PCT/DK2000/000329 priority Critical patent/WO2001098668A1/fr
Publication of WO2001098668A1 publication Critical patent/WO2001098668A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
    • F04D29/526—Details of the casing section radially opposing blade tips
    • 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
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps

Definitions

  • the present invention relates to a guiding arrangement for a large blower unit of the type which at the suction side of the impeller is connected to an inlet suction box that impart the inlet airflow a change of flow direction of between 45° and essentially 90°, where the driving shaft of the impeller is supported in a tubular body, which is passed through the suction box.
  • blowerunits it is often necessary, owing to shortage of space, cost of making conduits, etc. to connect an air or gas conduit to the suction inlet of a blower in a direction which is perpendicular to the axis of the blower. If the conduit is connected to the suction inlet by means of a pipe bend, the bulk of the air will flow along the outer wall of the bend, whereby the impeller is loaded asymmetrically. In this case the blower will not achieve the required pressure and volume flow, and its efficiency will be lowered significantly. In large blowers for power stations and fluidized bed systems, tunnels and the like, the power of the motor to drive the impeller may be 700 k or even more, so the efficiency of the blowerunit is of critical importance.
  • blowerunits Therefor inlet suction boxes for blowerunits have been developed, which shall give the inlet airflow an change in flow direction of between 45° and essentially 90° with increased efficiency compared to an ordinary bend.
  • a preferred assembly of blowerunits is constructed with a tubular body housing a through-going driving shaft for the impeller, control parts, inlet for sealing air, instruments, bearings or other parts for ensuring the desired machine function.
  • the tubular body is also preferred because it gives good accessi- bility in connection with maintenance and repair, but on the other hand the tubular body represents a flow obstruction in the suction box.
  • the tubular body is equipped with a guiding arrangement on the downstream face, which guiding arrangement is a guide body of essentially snow plough shape, which from a wide end at the intersection of the tubular body with a front wall of the suction box facing away from the impeller is connected substantially tangentially to the tubular body, while they in the direction of the impeller axis converges to a pointed wedge shape, the guiding arrangement being confined by curved sheetmem- bers .
  • An object for the present invention is to provide a guiding arrangement for a blower unit, which guiding arrangement causes a reduced flow resistance for the inlet airflow in a suction box.
  • the guiding arrangement according to the invention is characterized in that a essentially wedge shaped guide body is confined by substantially plane sheet members, which is parallel with the flowdirection of inlet air at introduction into the suction box and at a front wall of the suction box facing away from the impeller is connected substantially tangentially to the tubular body, while they in the axial direction of the impeller converges to a pointed wedge shape .
  • This design is cost saving to manufacture compared to the plough shaped body and gives a minimized pressure loss in the suction box by virtue of the fluidic improved design of the guiding arrangement .
  • the guiding arrangement ' is characterized in that the guide body at its end facing the impeller is connected to a guide vane or baffle plate in conventional guiding arrange- ment with stationary or adjustable guide vanes or baffle plates on the suction side of the impeller.
  • additional guiding vanes or baffle plates can further improve the flow into the impeller and in case of adjustable vanes, the flow can be optimized to the actual flow velocity of the incoming flow.
  • Fig. 1 is an end view of a large blower unit in partial cross section.
  • Fig. 2 is an inclined perspective view of the suction box with a guiding arrangement according to the invention
  • Fig. 3 is a side view of the suction box in Fig. 2.
  • the blower unit 1 for a large blower includes a suction box 3 with an inlet for air, an impeller 2 and a diffusor .
  • the impeller 2 is driven by a motor 10 connected to the impeller 2 by a shaft 11 through the suction box 3.
  • a tubular body 4 through the suction box 3 contains the shaft 11, main bearings 12 and any other equipment.
  • a fluid e.g. air to a power station or exhaust from a power station is drawn in by the impeller 2 into the suction box 3 in the direction shown by the arrow A, and the suction box
  • the shaft 11 passes through the suction box 3 in a tubular body 4, which also may hold main bearings 12 for the shaft 11, conduits for sealing air, and equipment necessary or useful for the function, monitoring or control of the blower.
  • the dimensions of the tubular body 4 is usually rather large, e.g. for a impeller 2 with a diameter at the blade tip of 3200 mm, the diameter of the tubular body 4 may be 1600 mm.
  • the tubular body 4 gives rise to flow resistance because of separation of the flow past the tubular body
  • a suction box 3 with a guiding arrangement according to the invention.
  • the suction box 3 is drawn as a transparent body with normally hidden lines shown by dashed lines, and the guiding arrangement shown by dashed lines in bold. Air will be drawn in through the rectangular inlet of the suction box 3 and imparted a change of flow direction towards the annular outlet of the suction box 3 and the subsequent impeller 2.
  • the suction box 3 has an inclined frontwall 8 facing away from the impeller 2 and a rounded part remote from the inlet of the suction box 3.
  • the guiding arrangement according to the invention includes an essentially wedge shaped guide body 5 confined by two plane walls 6, 7 e.g. of sheet metal, which are parallel with the flowdirection of inlet air at introduction into the suction box 3 and at a front wall 8 of the ' suction box 3 facing away from the impeller 2 are connected substantially tangentially to the tubular body 4, while they in the axial direction of the impeller 2 converges to a pointed wedge shape.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

L'invention concerne un assemblage de guidage servant pour une grande unité de soufflante du type doté d'un impulseur du côté d'aspiration et connecté à une caisse aspirante d'entrée (3). Celle-ci imprime au flux d'air entrant un changement de direction compris entre 45° et près de 90°. Dans la caisse aspirante, un corps tubulaire (4) passe (3), dans lequel un corps de guidage quasiment en forme de coin (5) est maintenu par des membres de feuille presque égaux (6, 7), qui sont parallèles à la direction du flux de l'air entrant à son arrivée dans la caisse aspirante (3) et à une paroi antérieure (8) de la caisse aspirante (3) du coté opposé à l'impulseur et qui sont connectés presque tangentiellement au corps tubulaire (4), alors que dans la direction axiale de l'impulseur, ils convergent vers une forme de coin pointue pour fournir ainsi une résistance de flux réduite au flux d'air entrant dans une caisse aspirante.
PCT/DK2000/000329 2000-06-21 2000-06-21 Assemblage de guidage d'une grande unite soufflante Ceased WO2001098668A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/DK2000/000329 WO2001098668A1 (fr) 2000-06-21 2000-06-21 Assemblage de guidage d'une grande unite soufflante

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DK2000/000329 WO2001098668A1 (fr) 2000-06-21 2000-06-21 Assemblage de guidage d'une grande unite soufflante

Publications (1)

Publication Number Publication Date
WO2001098668A1 true WO2001098668A1 (fr) 2001-12-27

Family

ID=8149393

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2000/000329 Ceased WO2001098668A1 (fr) 2000-06-21 2000-06-21 Assemblage de guidage d'une grande unite soufflante

Country Status (1)

Country Link
WO (1) WO2001098668A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002099288A1 (fr) * 2001-06-06 2002-12-12 Howden Power A/S Unité de sortie d'air pour un grand ensemble ventilateur
EP2975270A1 (fr) * 2014-07-16 2016-01-20 ALSTOM Transport Technologies Dispositif de ventilation à encombrement axial réduit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2524556A1 (de) * 1974-05-31 1975-12-04 Mitsubishi Heavy Ind Ltd Axialstroemungsgeblaese mit einzelansaug
US4167368A (en) * 1976-07-26 1979-09-11 Aktiengesellschaft Kuhnle, Kopp & Kausch Advance diffuser apparatus for a blower having a large impeller diameter
US4540338A (en) * 1982-04-05 1985-09-10 Oy Nokia Ab Suction chamber in a fan
US5188510A (en) * 1990-11-21 1993-02-23 Thomas R. Norris Method and apparatus for enhancing gas turbo machinery flow
DE4326800A1 (de) * 1993-08-10 1995-02-16 Abb Management Ag Vorrichtung zur Einstellung einer stabilen Verdichterzuströmung aus dem Einlaufkasten in Gasturbingenanlagen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2524556A1 (de) * 1974-05-31 1975-12-04 Mitsubishi Heavy Ind Ltd Axialstroemungsgeblaese mit einzelansaug
US4167368A (en) * 1976-07-26 1979-09-11 Aktiengesellschaft Kuhnle, Kopp & Kausch Advance diffuser apparatus for a blower having a large impeller diameter
US4540338A (en) * 1982-04-05 1985-09-10 Oy Nokia Ab Suction chamber in a fan
US5188510A (en) * 1990-11-21 1993-02-23 Thomas R. Norris Method and apparatus for enhancing gas turbo machinery flow
DE4326800A1 (de) * 1993-08-10 1995-02-16 Abb Management Ag Vorrichtung zur Einstellung einer stabilen Verdichterzuströmung aus dem Einlaufkasten in Gasturbingenanlagen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002099288A1 (fr) * 2001-06-06 2002-12-12 Howden Power A/S Unité de sortie d'air pour un grand ensemble ventilateur
US7029234B2 (en) 2001-06-06 2006-04-18 Howden Power A/S Air outlet unit for a large blower assembly
EP2975270A1 (fr) * 2014-07-16 2016-01-20 ALSTOM Transport Technologies Dispositif de ventilation à encombrement axial réduit
FR3023877A1 (fr) * 2014-07-16 2016-01-22 Alstom Transp Tech Dispositif de ventilation a encombrement axial reduit

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