EP0221227A2 - Axial fan - Google Patents

Axial fan Download PDF

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Publication number
EP0221227A2
EP0221227A2 EP86100670A EP86100670A EP0221227A2 EP 0221227 A2 EP0221227 A2 EP 0221227A2 EP 86100670 A EP86100670 A EP 86100670A EP 86100670 A EP86100670 A EP 86100670A EP 0221227 A2 EP0221227 A2 EP 0221227A2
Authority
EP
European Patent Office
Prior art keywords
annular channel
axial fan
guide ring
steering
blades
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
EP86100670A
Other languages
German (de)
French (fr)
Other versions
EP0221227B1 (en
EP0221227A3 (en
Inventor
Werner Kolb
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.)
Turbo-Lufttechnik GmbH
Turbo Lufttechnik GmbH
Original Assignee
Turbo-Lufttechnik GmbH
Turbo Lufttechnik GmbH
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 Turbo-Lufttechnik GmbH, Turbo Lufttechnik GmbH filed Critical Turbo-Lufttechnik GmbH
Priority to AT86100670T priority Critical patent/ATE61452T1/en
Publication of EP0221227A2 publication Critical patent/EP0221227A2/en
Publication of EP0221227A3 publication Critical patent/EP0221227A3/en
Application granted granted Critical
Publication of EP0221227B1 publication Critical patent/EP0221227B1/en
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
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/545—Ducts
    • F04D29/547—Ducts having a special shape in order to influence fluid flow
    • 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
    • F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
    • F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
    • F04D29/685—Inducing localised fluid recirculation in the stator-rotor interface
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y10S415/914—Device to control boundary layer

Definitions

  • the invention relates to an axial fan with the features of the preamble of claim 1.
  • the invention has for its object to simplify an axial fan of the generic type while increasing the tear-off limit in manufacturing.
  • the flat blades are easier and cheaper to manufacture than curved blades.
  • the tearing behavior is favorably influenced by the beveling of the trailing edges of the steering blades.
  • the planar steering blades can be arranged axially and inclined against a diameter of the axial fan or arranged radially and inclined to the circumferential direction of the guide ring.
  • the axial fan has a housing 1 which contains a conically narrowing inlet part 2, to which a cylindrical housing part 3 connects.
  • An impeller 4 rotates in the cylindrical housing part 3, the rotor blades 5 of which can be adjustable.
  • a device for stabilizing the tear-off limit which consists of a guide ring 6 and an annular channel 7 surrounding it, is connected upstream of the impeller 4.
  • the annular channel 7 is delimited radially on the outside by the jacket of the housing 1 which is enlarged in diameter in this area and laterally by two side walls 8, 9.
  • the side walls 8, 9 run perpendicular to the cylindrical housing part 3.
  • the side walls 8, 9 can also be arranged conically, as shown in FIG. 7. It is also possible to use one of the side walls 7, 8 conically and the other vertically.
  • the guide ring 6 is provided according to FIGS. 1 and 7 within the cylindrical housing part 3. It has approximately the same diameter as the cylindrical housing part 3, while its axial length is less than the axial length of the ring channel 7.
  • the guide ring 6 is arranged to the ring channel 7 so that it is the same distance from the two side walls 8, 9 having. The guide ring 6 thus leaves an opening on the upstream and downstream sides of the ring channel 7.
  • Steering vanes 10 are arranged within the ring channel 7, which direct the return flow that occurs.
  • the steering blades 10 are connected to the guide ring 6 and the housing 1.
  • the trailing and leading edges of the steering blades 10 run obliquely outwards, the length of the steering blades 10 increasing in the radial direction.
  • the steering blades 10 consist of flat sheets which are set against the longitudinal axis of the ring channel 7. 3 and 4, the steering blades 10 are arranged axially parallel and inclined to a diameter of the guide ring 6. In the embodiment shown in FIGS. 5 and 6, the steering blades 10 are arranged radially and inclined to the circumferential direction of the guide pillar 6. In these figures, the arrows indicate the direction of rotation of the impeller 4. The respective angle of inclination should be between 20 ° and 70 °. In the axial fans shown, it is 45 °.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)

Abstract

An axial blower with an intake that tapers conically into a cylindrical component. An impeller rotates inside the cylindrical component. A stationary channeling ring of approximately the same diameter as the cylindrical component is positioned upstream of the impeller and surrounded by an annular channel. The channeling ring is approximately equidistant from each end of the annular channel. Diversion blades are positioned inside the annular channel and adjusted in relation to its axis. To make the blower easier and less expensive to manufacture and to increase its breakaway limit, the diversion blades consist of flat sheets of metal and both their upstream and their downstream edges slope.

Description

Die Erfindung betrifft ein Axialgebläse mit den Merk­malen des Oberbegriffes des Anspruches 1.The invention relates to an axial fan with the features of the preamble of claim 1.

Bei einem solchen, aus VGB-Kraftwerkstechnik 75 (1977) , Seiten 159 bis 165 bekannten Axialgebläse kann das Ab­reißen der Strömung bei der Förderung kleiner Volumina vermindert werden. In dem Bypass-Ringkanal wird die in einem solchen Fall am Außendurchmesser des Laufrades auf­tretende Rückströmung örtlich stabilisiert. Dabei wird der Drall, der in dieser Rückströmung vorhanden ist, durch die Lenkschaufeln im Ringkanal gerichtet.With such an axial fan known from VGB Kraftwerkstechnik 75 (1977), pages 159 to 165, the breaking of the flow can be reduced when small volumes are conveyed. The backflow occurring in such a case on the outer diameter of the impeller is locally stabilized in the bypass ring channel. The swirl that is present in this backflow is directed by the steering blades in the ring channel.

Aus der internationalen Patentanmeldung WO 85/00640 ist ein Axialgebläse bekannt, bei dem die genannten Lenk­schaufeln innerhalb des Ringkanals gebogen sind. Die Fertigung derartiger Lenkschaufeln erhöht den Aufwand für das Axialgebläse.From the international patent application WO 85/00640 an axial fan is known in which the steering vanes mentioned are bent within the ring channel. The manufacture of such steering blades increases the effort for the axial fan.

Der Erfindung liegt die Aufgabe zugrunde, ein Axialgebläse der gattungsgemäßen Art unter Erhöhung der Abreißgrenze fertigungstechnisch zu vereinfachen.The invention has for its object to simplify an axial fan of the generic type while increasing the tear-off limit in manufacturing.

Diese Aufgabe wird bei einem gattungsgemäßen Axialgebläse durch die kennzeichnenden Merkmale des Anspruches 1 gelöst. Eine vorteilhafte Ausgestaltung der Erfindung ist in den Unteransprüchen angegeben.This object is achieved in a generic axial fan by the characterizing features of claim 1. An advantageous embodiment of the invention is specified in the subclaims.

Die ebenen Schaufeln lassen sich gegenüber gebogenen Schaufeln einfacher und kostengünstiger fertigen. Durch die Abschrägung auch der Abströmkanten der Lenkschaufeln wird das Abreißverhalten güngstig beeinflußt. Die ebenen Lenkschaufeln können axial angeordnet und gegen einen Durchmesser des Axialgebläses geneigt sein oder radial an­geordnet und zur Umfangsrichtung des Leitringes geneigt sein.The flat blades are easier and cheaper to manufacture than curved blades. The tearing behavior is favorably influenced by the beveling of the trailing edges of the steering blades. The planar steering blades can be arranged axially and inclined against a diameter of the axial fan or arranged radially and inclined to the circumferential direction of the guide ring.

In der internationalen Patentanmeldung WO 82/01919 ist zwar ein Axialgebläse beschrieben, das ebene Lenkschau­feln enthält. Diese Lenkschaufeln sind jedoch rein radial und rein axial angeordnet. Weiterhin ist der Leitring mit der Seitenwand verbunden, die den Ringkanal an dem dem Laufrad abgewandten Ende begrenzt. Die Luft kann daher an dieser Stelle nicht radial austreten, wodurch die Wirkung dieser Einrichtung wesentlich beeinträchtigt wird.In the international patent application WO 82/01919 an axial blower is described which contains plane steering blades. However, these steering blades are arranged purely radially and purely axially. Furthermore, the guide ring is connected to the side wall which delimits the ring channel at the end facing away from the impeller. The air can therefore not escape radially at this point, which significantly affects the effect of this device.

Mehrere Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher erläutert. Es zeigen:

  • Fig. 1 ein Axialgebläse gemäß der Erfindung teils im Längsschnitt und teils als Vorderansicht,
  • Fig. 2 die Einzelheit Z nach Fig. 1,
  • Fig. 3 den Schnitt III-III nach Fig. 2,
  • Fig. 4 den Schnitt IV-IV nach Fig. 2,
  • Fig. 5 den Schnitt III-III nach Fig. 2 für eine andere Ausführungsform,
  • Fig. 6 den Schnitt IV-IV nach Fig. 2 für diese Ausfüh­rungsform und
  • Fig. 7 teils im Längsschnitt und teils als Vorderansicht eine weitere Ausführungsform der Erfindung.
Several embodiments of the invention are shown in the drawing and are explained in more detail below. Show it:
  • 1 is an axial fan according to the invention, partly in longitudinal section and partly as a front view,
  • 2 shows the detail Z of FIG. 1,
  • 3 shows the section III-III according to FIG. 2,
  • 4 shows the section IV-IV according to FIG. 2,
  • 5 shows the section III-III of FIG. 2 for another embodiment,
  • Fig. 6 shows the section IV-IV of FIG. 2 for this embodiment and
  • Fig. 7 partly in longitudinal section and partly as a front view of another embodiment of the invention.

Das Axialgebläse weist ein Gehäuse 1 auf, das einen sich konisch verengenden Einlaufteil 2 enthält, an den sich ein zylindrischer Gehäuseteil 3 anschließt. In dem zylind­drischen Gehäuseteil 3 läuft ein Laufrad 4 um, dessen Laufschaufeln 5 verstellbar sein können.The axial fan has a housing 1 which contains a conically narrowing inlet part 2, to which a cylindrical housing part 3 connects. An impeller 4 rotates in the cylindrical housing part 3, the rotor blades 5 of which can be adjustable.

Dem Laufrad 4 vorgeschaltet ist eine Einrichtung zur Stabilisierung der Abreißgrenze, die aus einem Leitring 6 und einem diesen umgebenden Ringkanal 7 besteht. Der Ring­kanal 7 ist radial außen durch den in diesem Bereich im Durchmesser vergrößerten Mantel des Gehäuses 1 und seitlich durch zwei Seitenwände 8, 9 begrenzt. Nach den Fig. 1 und 2 verlaufen die Seitenwände 8, 9 senkrecht zum zylindri­schen Gehäuseteil 3. Die Seitenwände 8, 9 können auch kegelig angeordnet sein, wie in Fig. 7 dargestellt ist. Es ist auch möglich, eine der Seitenwände 7, 8 kegelig und die andere senkrecht einzusetzen.A device for stabilizing the tear-off limit, which consists of a guide ring 6 and an annular channel 7 surrounding it, is connected upstream of the impeller 4. The annular channel 7 is delimited radially on the outside by the jacket of the housing 1 which is enlarged in diameter in this area and laterally by two side walls 8, 9. According to FIGS. 1 and 2, the side walls 8, 9 run perpendicular to the cylindrical housing part 3. The side walls 8, 9 can also be arranged conically, as shown in FIG. 7. It is also possible to use one of the side walls 7, 8 conically and the other vertically.

Der Leitring 6 ist nach den Fig. 1 und 7 innerhalb des zylindrischen Gehäuseteils 3 vorgesehen. Er weist etwa den gleichen Durchmesser auf wie der zylindrische Gehäuse­teil 3, während seine axiale Länge geringer ist als die axiale Länge des Ringkanals 7. Der Leitring 6 ist so zu dem Ringkanal 7 angeordnet, daß er von den beiden Seiten­wänden 8, 9 den gleichen Abstand aufweist. Der Leitring 6 läßt somit auf der Anströmseite und der Abströmseite des Ringkanals 7 jeweils eine Öffnung frie.The guide ring 6 is provided according to FIGS. 1 and 7 within the cylindrical housing part 3. It has approximately the same diameter as the cylindrical housing part 3, while its axial length is less than the axial length of the ring channel 7. The guide ring 6 is arranged to the ring channel 7 so that it is the same distance from the two side walls 8, 9 having. The guide ring 6 thus leaves an opening on the upstream and downstream sides of the ring channel 7.

Innerhalb des Ringkanals 7 sind Lenkschaufeln 10 angeord­net, die die sich einstellende Rückströmung richten. Die Lenkschaufeln 10 sind mit dem Leitring 6 und dem Gehäuse 1 verbunden. Die Abström- und Anströmkanten der Lenkschau­feln 10 verlaufen schräg nach außen, wobei die Länge der Lenkschaufeln 10 in radialer Richtung zunimmt.Steering vanes 10 are arranged within the ring channel 7, which direct the return flow that occurs. The steering blades 10 are connected to the guide ring 6 and the housing 1. The trailing and leading edges of the steering blades 10 run obliquely outwards, the length of the steering blades 10 increasing in the radial direction.

Die Lenkschaufeln 10 bestehen aus ebenen Blechen, die gegen die Längsachse des Ringkanals 7 angestellt sind. Nach den Fig. 3 und 4 sind die Lenkschaufeln 10 achs­parallel angeordnet und gegenüber einem Durchmesser des Leitringes 6 geneigt. Bei der in den Fig. 5 und 6 darge­stellten Ausführungsform sind die Lenkschaufeln 10 radial angeordnet und zur Umfangsrichtung des Leitrunges 6 geneigt. In diesen Figuren geben die Pfeile die Dreh­richtung des Laufrades 4 an. Der jeweilige Neigungswin­kel sollte zwischen 20° und 70° liegen. Bei den darge­stellten Axialgebläsen beträgt er 45°.The steering blades 10 consist of flat sheets which are set against the longitudinal axis of the ring channel 7. 3 and 4, the steering blades 10 are arranged axially parallel and inclined to a diameter of the guide ring 6. In the embodiment shown in FIGS. 5 and 6, the steering blades 10 are arranged radially and inclined to the circumferential direction of the guide pillar 6. In these figures, the arrows indicate the direction of rotation of the impeller 4. The respective angle of inclination should be between 20 ° and 70 °. In the axial fans shown, it is 45 °.

Claims (3)

Axialgebläse mit einem sich konisch verengenden Ein­laufteil (2) und einem sich daran anschließenden zylin­drischen Gehäuseteil (3) , in dem ein Laufrad (4) dreh­bar angeordnet ist, dem ein feststehender Leitring (6) vorgeschaltet ist, der etwa den gleichen Durchmesser aufweist wie der zylindrische Gahäuseteil (3) und von einem Ringkanal (7) umgeben ist, wobei der Leitring (6) von den beiden Enden des Ringkanals (7) etwa den glei­chen Abstand aufweist und innerhalb des Ringkanals (7) gegen dessen Achse angestellte Lenkschaufeln (10) angeordnet sind, deren Anströmkanten schräg nach außen verlaufen, dadurch gekennzeichnet, daß die Lenkschaufeln (10) aus ebenen Blechen bestehen, deren Abströmkanten ebenfalls schräg verlaufen.Axial fan with a conically narrowing inlet part (2) and an adjoining cylindrical housing part (3), in which an impeller (4) is rotatably arranged, which is preceded by a fixed guide ring (6) which has approximately the same diameter as that cylindrical housing part (3) and surrounded by an annular channel (7), the guide ring (6) being approximately the same distance from the two ends of the annular channel (7) and steering vanes (10) positioned within the annular channel (7) against its axis are arranged, the leading edges of which run obliquely outwards, characterized in that the steering blades (10) consist of flat metal sheets, the trailing edges of which also run obliquely. 2. Axialgebläse nach Anspruch 1, dadurch gekenn­zeichnet, daß die Lenkschaufeln (10) achs­parallel angeordnet und gegen einen Durchmesser des Leitringes (6) geneigt sind.2. Axial fan according to claim 1, characterized in that the steering blades (10) are arranged axially parallel and are inclined against a diameter of the guide ring (6). 3. Axialgebläse nach Anspruch 1, dadurch gekenn­zeichnet, daß die Lenkschaufeln (10) radial angeordnet und zur Umfangsrichtung des Leitringes (6) geneigt sind.3. Axial fan according to claim 1, characterized in that the steering blades (10) are arranged radially and are inclined to the circumferential direction of the guide ring (6).
EP86100670A 1985-11-08 1986-01-20 Axial fan Expired - Lifetime EP0221227B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86100670T ATE61452T1 (en) 1985-11-08 1986-01-20 AXIAL FAN.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3539604A DE3539604C1 (en) 1985-11-08 1985-11-08 Axial fan
DE3539604 1985-11-08

Publications (3)

Publication Number Publication Date
EP0221227A2 true EP0221227A2 (en) 1987-05-13
EP0221227A3 EP0221227A3 (en) 1988-09-14
EP0221227B1 EP0221227B1 (en) 1991-03-06

Family

ID=6285446

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86100670A Expired - Lifetime EP0221227B1 (en) 1985-11-08 1986-01-20 Axial fan

Country Status (14)

Country Link
US (1) US4673331A (en)
EP (1) EP0221227B1 (en)
JP (1) JP2605019B2 (en)
CN (1) CN86105014B (en)
AT (1) ATE61452T1 (en)
AU (1) AU588170B2 (en)
CS (1) CS261249B2 (en)
DD (1) DD252216A5 (en)
DE (2) DE3539604C1 (en)
IN (1) IN167807B (en)
MX (1) MX168407B (en)
PL (1) PL149336B1 (en)
SU (1) SU1486067A3 (en)
ZA (1) ZA864651B (en)

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JPH04132899A (en) * 1990-09-25 1992-05-07 Mitsubishi Heavy Ind Ltd Axial blower
EP0497574B1 (en) * 1991-01-30 1995-09-20 United Technologies Corporation Fan case treatment
US5282718A (en) * 1991-01-30 1994-02-01 United Technologies Corporation Case treatment for compressor blades
US5489186A (en) * 1991-08-30 1996-02-06 Airflow Research And Manufacturing Corp. Housing with recirculation control for use with banded axial-flow fans
US5358373A (en) * 1992-04-29 1994-10-25 Varian Associates, Inc. High performance turbomolecular vacuum pumps
ES2173121T3 (en) * 1993-08-30 2002-10-16 Bosch Robert Corp COMBINATION OF FAN AND HOUSING.
GB9400254D0 (en) * 1994-01-07 1994-03-02 Britisch Technology Group Limi Improvements in or relating to housings for axial flow fans
US6302640B1 (en) * 1999-11-10 2001-10-16 Alliedsignal Inc. Axial fan skip-stall
EP1404975B1 (en) 2001-06-15 2009-08-26 Concepts ETI, Inc. Flow stabilizing device
DE10135003C1 (en) * 2001-07-18 2002-10-02 Mtu Aero Engines Gmbh Compressor housing structure in axially, through-flowing moving blade ring for use in pumps
DE10330084B4 (en) * 2002-08-23 2010-06-10 Mtu Aero Engines Gmbh Recirculation structure for turbocompressors
WO2004018844A1 (en) 2002-08-23 2004-03-04 Mtu Aero Engines Gmbh Recirculation structure for a turbocompressor
US7025557B2 (en) * 2004-01-14 2006-04-11 Concepts Eti, Inc. Secondary flow control system
DE102004032978A1 (en) 2004-07-08 2006-02-09 Mtu Aero Engines Gmbh Flow structure for a turbocompressor
CN101382145B (en) * 2007-09-07 2010-08-04 株式会社瑞典 Blowing and discharging fan
US8598751B2 (en) 2011-05-09 2013-12-03 Honeywell International Inc. Generator with integrated blower
US9303561B2 (en) 2012-06-20 2016-04-05 Ford Global Technologies, Llc Turbocharger compressor noise reduction system and method
US10337529B2 (en) 2012-06-20 2019-07-02 Ford Global Technologies, Llc Turbocharger compressor noise reduction system and method
CN105697421A (en) * 2016-03-23 2016-06-22 江苏大学 Saddle-area-free axial flow fan
RU2750512C2 (en) * 2016-11-04 2021-06-29 Форд Глобал Текнолоджиз, Ллк System and method for reducing turbocharger compressor noise
CN115264599A (en) * 2022-08-04 2022-11-01 珠海格力电器股份有限公司 Guiding device, fan and air conditioner

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WO1982001919A1 (en) * 1980-12-03 1982-06-10 Abdel Fattah Adnan M Stall-free axial flow fan
GB2124303A (en) * 1982-07-29 1984-02-15 Do Gpkexi Komplex Mekh Shakht Axial-flow ventilation fan
EP0122892A1 (en) * 1983-03-18 1984-10-24 Fläkt Aktiebolag Method of producing a guide vane ring for a return flow passage in axial fans
WO1985000640A1 (en) * 1983-07-28 1985-02-14 Nordisk Ventilator Co. A/S Axial-flow fan

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Publication number Priority date Publication date Assignee Title
WO1982001919A1 (en) * 1980-12-03 1982-06-10 Abdel Fattah Adnan M Stall-free axial flow fan
GB2124303A (en) * 1982-07-29 1984-02-15 Do Gpkexi Komplex Mekh Shakht Axial-flow ventilation fan
EP0122892A1 (en) * 1983-03-18 1984-10-24 Fläkt Aktiebolag Method of producing a guide vane ring for a return flow passage in axial fans
WO1985000640A1 (en) * 1983-07-28 1985-02-14 Nordisk Ventilator Co. A/S Axial-flow fan

Also Published As

Publication number Publication date
EP0221227B1 (en) 1991-03-06
SU1486067A3 (en) 1989-06-07
ZA864651B (en) 1987-02-25
DD252216A5 (en) 1987-12-09
CS261249B2 (en) 1989-01-12
CN86105014B (en) 1988-12-21
ATE61452T1 (en) 1991-03-15
AU6080786A (en) 1987-05-14
PL261049A1 (en) 1987-08-10
US4673331A (en) 1987-06-16
CS787986A2 (en) 1988-04-15
AU588170B2 (en) 1989-09-07
EP0221227A3 (en) 1988-09-14
PL149336B1 (en) 1990-02-28
DE3677891D1 (en) 1991-04-11
CN86105014A (en) 1987-05-13
JPS62111198A (en) 1987-05-22
DE3539604C1 (en) 1987-02-19
IN167807B (en) 1990-12-22
MX168407B (en) 1993-05-24
JP2605019B2 (en) 1997-04-30

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