EP0922862B1 - Axial fan for ventilating systems - Google Patents

Axial fan for ventilating systems Download PDF

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Publication number
EP0922862B1
EP0922862B1 EP98122961A EP98122961A EP0922862B1 EP 0922862 B1 EP0922862 B1 EP 0922862B1 EP 98122961 A EP98122961 A EP 98122961A EP 98122961 A EP98122961 A EP 98122961A EP 0922862 B1 EP0922862 B1 EP 0922862B1
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EP
European Patent Office
Prior art keywords
axial fan
rotor
housing
spacer ring
impeller
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
EP98122961A
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German (de)
French (fr)
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EP0922862A2 (en
EP0922862A3 (en
Inventor
Volker Fröhlich
Frank Wahl
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.)
TLT Turbo GmbH
Original Assignee
Turbo-Lufttechnik GmbH
Turbo Lufttechnik GmbH
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Publication of EP0922862A2 publication Critical patent/EP0922862A2/en
Publication of EP0922862A3 publication Critical patent/EP0922862A3/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/08Sealings
    • F04D29/16Sealings between pressure and suction sides
    • F04D29/161Sealings between pressure and suction sides especially adapted for elastic fluid pumps
    • F04D29/164Sealings between pressure and suction sides especially adapted for elastic fluid pumps of an axial flow wheel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00Axial-flow pumps
    • F04D19/002Axial flow fans
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/02Selection of particular materials
    • F04D29/023Selection of particular materials especially adapted for elastic fluid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/40Casings; Connections of working fluid
    • F04D29/52Casings; Connections of working fluid for axial pumps
    • F04D29/522Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
    • F04D29/526Details of the casing section radially opposing blade tips
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00Materials; Properties thereof
    • F05D2300/50Intrinsic material properties or characteristics
    • F05D2300/502Thermal properties

Definitions

  • the invention relates to an axial fan for ventilation systems for combined ventilation and smoke extraction operation with the Features of the preamble of claim 1.
  • Axial fans are used in ventilation technology for both ventilation and smoke extraction in Fire must be suitable.
  • One is with axial fans strives to leave a small impeller gap between the Bucket tips and the inner wall of the housing to be observed optimal values in terms of acoustics, aerodynamics Behavior, efficiency and vibration behavior of the Achieve axial fan.
  • Fire temperature must withstand far above normal Room temperature. Stretches under these operating conditions the impeller and the housing are different. It can the case occur that the impeller expands so far that brushes against the housing. It is essential to prevent this.
  • an axial fan which is based on a Oil tanker is arranged and which serves flammable gases aspirate from the oil tanks. With this axial fan, the Risk of explosion due to spark formation can be avoided.
  • a water turbine is used as the drive for the axial fan used.
  • the use of one is aimed in the same direction made of plastic ring inside the Fan housing is attached and the impeller of the axial fan surrounds. This ring is said to be a metal-to-metal contact and to avoid sparking.
  • the invention has for its object the generic Axial fan to be designed so that a combined ventilation and Smoke extraction operation of the axial fan in each case optimal conditions is possible.
  • the arrangement of the insert ring allows the Impeller gap to be set between the ventilation case Flow tips and the insert ring fluidically lay out correctly so that the axial fan in this Operating case runs optimally.
  • the insert ring is replaced by the Blade tips rubbed off. This brings the Impeller gap between the now enlarged impeller diameter and the reduced thickness insert ring on the bottom these operating conditions are technically correct on. This means that the axial fan also gets under in the event of a fire optimal conditions.
  • the axial fan shown is used for ventilation of Structures and is for combined ventilation and Smoke extraction suitable.
  • the axial fan contains a Housing 1, which is provided with two connecting flanges 2.
  • In the housing 1 is an impeller 3 and a motor pot 4th arranged.
  • the motor pot 4 takes a motor 5 for the drive of the impeller 3.
  • the impeller 3 consists of a through the Motor 5 driven shaft 6, from a hub 7 and out in the Hub 7 arranged, preferably adjustable blades 8th.
  • annular Flow channel 9 Between the housing 1 on the one hand and the motor pot 4 and the Hub 7 of the impeller 3, on the other hand, is annular Flow channel 9 through which the pumped medium in the direction of Arrows 10 is promoted. Downstream from the blades 8 are fixed guide vanes 11 in the flow channel 9 arranged.
  • an insert ring 12 is used, which is on the inside of the Housing 1 is attached.
  • This insert ring 12 consists of a material that is used in normal operation, i.e. for ventilation of rooms with promotion of indoor air, wear-resistant and at least briefly during a one-off Smoke extraction is heat-resistant.
  • the distance of the peaks the blades 8 from the inner wall of the housing 1 0.2 to 2%, and the distance between the tips of the blades 8 from the inside of the insert ring 12 is 0.0 to 0.5% of the impeller diameter. In normal or ventilation mode the impeller gap is fluidly correctly designed.
  • the axial fan should remove smoke and fire gases from Promote elevated temperature.
  • the material of the insert ring 12 is now chosen so that it is mechanical compared to the material of the impeller 3 with mutual friction stress between Impeller 3 and insert ring 12 is wearing. Since that Impeller 3 under the influence of the elevated temperature of the Pumped medium expands and thereby increases in diameter now the tips of the barrel 8 shovel the insert ring 12 rub without coming into contact with the housing 1.
  • the thickness of the insert ring 12 should be chosen so that the Never touch the blades 8 on the housing 1.
  • FIGS. 4 and 5 The mode of operation of the insert ring 12 is shown in FIGS. 4 and 5 shown clearly.
  • Fig. 4 the axial fan is in depicted in its original form as for the Ventilation operation comes into question.
  • Fig. 5 shows that the Diameter of the impeller 3 due to the increased Temperature of the hot smoke and combustion gases has increased.
  • the Tips of the blades 8 have a part of the insert ring 12 rubbed, so that in turn an impeller gap of less Height between the impeller 3 and the now changed insert ring 12 exists.
  • the front edge plane of the insert ring 12 is smooth and stands at an angle of 90 ° to the axis of the shaft 6 of the impeller 3.
  • the insert ring 12 is the largest possible Bucket setting angle as flush as possible Impeller entry level 13 installed to a flawless To ensure flow to the impeller 3. With smaller ones The blade leading angle is the front edge of the blade slightly above. If the insert ring 12 is not flush with Front edge of the blades 8 placed and is on the On the inflow side, in the event of a fire, it becomes the front Protruding area not sanded. This allows it to go through a bad flow against the expanded impeller 3 come to a stall. The impeller 3 then runs in one Bead that looks like a wheel gap that is too large. A little The projection of the insert ring 12 is, however, a few mm harmless.
  • the insert ring 12 extends at least over that of the Blades 8 coated area. He can also use the Trailing edge of the blades 8 out to the rear Edge of the hub 7 or up to the guide vanes 11.
  • the Trailing edge of the insert ring 12 can be just like that Leading edge be smooth or tapered in diameter Run in housing 1.
  • the material used for the insert ring 12 is flexible and consists preferably of fiber mats, which as webs to the Round shape of the housing 1 can be adjusted.
  • the insert ring 12 can consist of one or more layers 14 one above the other be built that glued to the inner wall of the housing 1 or be fastened with the help of rivets 15. These rivets 15 are in smoke extraction mode by the blades 8 rubbed together with the insert ring 12.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

An insert ring (12) is fastened on the inside wall of the housing (1) and comprises a material which does not wear in use and which wears during smoke removal. The distance of the tips of the blades (8) from the inside wall of the housing is preferably 0.2-2.0% of the impeller diameter and from the inside of the insert ring is 0-0.5% of the impeller diameter.

Description

Die Erfindung betrifft einen Axialventilator für Lüftungsanlagen für den kombinierten Lüftungs- und Entrauchungsbetrieb mit den Merkmalen des Oberbegriffes des Anspruches 1.The invention relates to an axial fan for ventilation systems for combined ventilation and smoke extraction operation with the Features of the preamble of claim 1.

In der Lüftungstechnik werden Axialventilatoren eingesetzt, die sowohl für den Lüftungsfall als auch für die Entrauchung im Brandfall geeignet sein müssen. Bei Axialventilatoren ist man bestrebt, einen kleinen Laufradspalt zwischen den Laufschaufelspitzen und der Gehäuseinnenwand einzuhalten, um optimale Werte im Hinblick auf die Akustik, das aerodynamische Verhalten, den Wirkungsgrad und das Schwingungsverhalten des Axialventilators zu erreichen. Für den Brandfall besteht die Forderung, daß der Ventilator eine definierte Zeitspanne Brandtemperatur standhalten muß, die weit über der normalen Raumtemperatur liegen. Unter diesen Betriebsbedingungen dehnt sich das Laufrad und das Gehäuse unterschiedlich aus. Dabei kann der Fall eintreten, daß sich das Laufrad soweit aufweitet, daß es am Gehäuse anstreift. Dies ist unbedingt zu verhindern. Man ist daher gezwungen, den Laufradspalt bei kombinierten Lüftungs-und Brandgasventilatoren soweit zu vergrößern, daß ein Anstreifen des Laufrades aufgrund der Wärmedehnung und der bleibenden Dehnung bei hohen Umfangsgeschwindigkeiten nicht auftreten kann. Eine solche Vergrößerung des Laufradspaltes führt jedoch zu enormen aerodynamischen Leistungseinbußen und zur Schallerhöhung, die für den Einsatz der Brandgasaxialventilatoren im Lüftungsbetrieb nicht hinnehmbar sind.Axial fans are used in ventilation technology for both ventilation and smoke extraction in Fire must be suitable. One is with axial fans strives to leave a small impeller gap between the Bucket tips and the inner wall of the housing to be observed optimal values in terms of acoustics, aerodynamics Behavior, efficiency and vibration behavior of the Achieve axial fan. In the event of fire there is Requirement that the fan has a defined period of time Fire temperature must withstand far above normal Room temperature. Stretches under these operating conditions the impeller and the housing are different. It can the case occur that the impeller expands so far that brushes against the housing. It is essential to prevent this. you is therefore forced to use the combined ventilation and impeller gap Increase fire gas fans so far that a Brushing the impeller due to thermal expansion and permanent elongation at high peripheral speeds can occur. Such an enlargement of the impeller gap leads to enormous aerodynamic performance losses and to increase noise, which is necessary for the use of Fire gas axial fans in ventilation mode not acceptable are.

Aus der GB 879 740 A ist ein Axiallüfter bekannt, der auf einem Öltanker angeordnet ist und der dazu dient, entflammbare Gase aus den Ölbehältern abzusaugen. Bei diesem Axiallüfter muss die Explosionsgefahr durch Funkenbildung vermieden werden. Zu diesem Zweck wird als Antrieb für den Axiallüfter eine Wasserturbine verwendet. In die gleiche Richtung zielt die Verwendung eines aus Kunststoff gefertigten Ringes, der innerhalb des Lüftergehäuses angebracht ist und das Laufrad des Axiallüfters umgibt. Dieser Ring soll einen Metall-zu-Metall-Kontakt und damit eine Funkenbildung vermeiden.From GB 879 740 A an axial fan is known which is based on a Oil tanker is arranged and which serves flammable gases aspirate from the oil tanks. With this axial fan, the Risk of explosion due to spark formation can be avoided. To this A water turbine is used as the drive for the axial fan used. The use of one is aimed in the same direction made of plastic ring inside the Fan housing is attached and the impeller of the axial fan surrounds. This ring is said to be a metal-to-metal contact and to avoid sparking.

Aus der DE 14 03 039 B ist ein Axialverdichter bekannt, bei dem zwischen den Köpfen der Laufschaufeln ein abschabbarer Überzug aus einem porösen Metall vorgesehen ist. Durch ein Abschaben des Überzuges beim Einlaufen des Axialverdichters stellt der Axialverdichter selbst die Spaltbreite ein, so dass das Spiel zwischen Laufschaufeln und Gehäuse bei der normalerweise gefahrenen höchsten Betriebstemperatur am geringsten ist.From DE 14 03 039 B an axial compressor is known in which a scrapable coating between the blades' heads is provided from a porous metal. By scraping the The coating when the axial compressor runs in provides the Axial compressor itself the gap width, so the game between blades and housing at the normally driven highest operating temperature is the lowest.

Der Erfindung liegt die Aufgabe zugrunde, den gattungsgemäßen Axialventilator so zu gestalten, daß ein kombinierter Lüftungs-und Entrauchungsbetrieb des Axialventilators jeweils unter optimalen Bedingungen möglich ist.The invention has for its object the generic Axial fan to be designed so that a combined ventilation and Smoke extraction operation of the axial fan in each case optimal conditions is possible.

Diese Aufgabe wird bei einem gattungsgemäßen Axialventilator erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruches 1 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.This task is performed with a generic axial fan according to the invention by the characterizing features of Claim 1 solved. Advantageous embodiments of the invention are the subject of the subclaims.

Durch die Anordnung des Einlegeringes läßt sich der im Lüftungsfall einzustellende Laufradspalt zwischen den Laufschaufelspitzen und dem Einlegering strömungstechnisch korrekt auslegen, so daß der Axialventilator in diesem Betriebsfall optimal läuft. In dem Maße, wie das Laufrad im Brandfall bei der Entrauchung mit ansteigender Temperatur des Fördermediums wächst, wird der Einlegering durch die Laufschaufelspitzen abgerieben. Dadurch nähert sich der Laufradspalt zwischen dem jetzt vergrößerten Laufraddurchmesser und dem in der Dicke verringerten Einlegering auf den unter diesen Betriebsverhältnissen strömungstechnisch korrekten Wert an. Damit läuft der Axialventilator auch im Brandfall unter optimalen Bedingungen.The arrangement of the insert ring allows the Impeller gap to be set between the ventilation case Flow tips and the insert ring fluidically lay out correctly so that the axial fan in this Operating case runs optimally. To the extent that the impeller in Fire event during smoke extraction with increasing temperature of the Medium is growing, the insert ring is replaced by the Blade tips rubbed off. This brings the Impeller gap between the now enlarged impeller diameter and the reduced thickness insert ring on the bottom these operating conditions are technically correct on. This means that the axial fan also gets under in the event of a fire optimal conditions.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher erläutert. Es zeigen:

  • Fig. 1 den Längsschnitt durch einen Axialventilator,
  • Fig. 2 die Seitenansicht nach Fig. 1,
  • Fig. 3 die Einzelheit Z nach Fig. 2,
  • Fig. 4 schematisch einen Axialventilator im Lüftungsfall und
  • Fig. 5 schematisch einen Axialventilator im Entrauchungsfall.
  • An embodiment of the invention is shown in the drawing and is explained in more detail below. Show it:
  • 1 shows the longitudinal section through an axial fan,
  • 2 shows the side view of FIG. 1,
  • 3 shows the detail Z according to FIG. 2,
  • Fig. 4 shows schematically an axial fan in the case of ventilation and
  • Fig. 5 shows schematically an axial fan in the case of smoke extraction.
  • Der dargestellte Axialventilator dient der Belüftung von Bauwerken und ist für den kombinierten Lüftungs- und Entrauchungsbetrieb geeignet. Der Axialventilator enthält ein Gehäuse 1, das mit zwei Anschlußflanschen 2 versehen ist. In dem Gehäuse 1 sind ein Laufrad 3 und ein Motortopf 4 angeordnet. Der Motortopf 4 nimmt einen Motor 5 für den Antrieb des Laufrades 3 auf. Das Laufrad 3 besteht aus einer durch den Motor 5 angetriebenen Welle 6, aus einer Nabe 7 und aus in der Nabe 7 angeordneten, vorzugsweise einstellbaren Laufschaufeln 8.The axial fan shown is used for ventilation of Structures and is for combined ventilation and Smoke extraction suitable. The axial fan contains a Housing 1, which is provided with two connecting flanges 2. In the housing 1 is an impeller 3 and a motor pot 4th arranged. The motor pot 4 takes a motor 5 for the drive of the impeller 3. The impeller 3 consists of a through the Motor 5 driven shaft 6, from a hub 7 and out in the Hub 7 arranged, preferably adjustable blades 8th.

    Zwischen dem Gehäuse 1 einerseits und dem Motortopf 4 und der Nabe 7 des Laufrades 3 andererseits besteht ein ringförmiger Strömungskanal 9, durch den das Fördermedium in Richtung der Pfeile 10 gefördert wird. Stromabwärts von den Laufschaufeln 8 sind in dem Strömungskanal 9 feststehende Leitschaufeln 11 angeordnet.Between the housing 1 on the one hand and the motor pot 4 and the Hub 7 of the impeller 3, on the other hand, is annular Flow channel 9 through which the pumped medium in the direction of Arrows 10 is promoted. Downstream from the blades 8 are fixed guide vanes 11 in the flow channel 9 arranged.

    In den Laufradspalt zwischen dem Gehäuse 1 und dem Laufrad 3 ist ein Einlegering 12 eingesetzt, der an der Innenseite des Gehäuses 1 befestigt ist. Dieser Einlegering 12 besteht aus einem Werkstoff, der im Normalbetrieb, das heißt zur Lüftung von Räumen unter Förderung von Raumluft, verschleißfest und zumindest kurzfristig während eines einmaligen Entrauchungsfalles wärmebeständig ist. Der Abstand der Spitzen der Laufschaufeln 8 von der Innenwand des Gehäuses 1 beträgt 0,2 bis 2 %, und der Abstand der Spitzen der Laufschaufeln 8 von der Innenseite des Einlegeringes 12 beträgt 0,0 bis 0,5 % des Laufraddurchmessers. Im Normal- oder Lüftungsbetrieb ist der Laufradspalt strömungstechnisch korrekt ausgelegt.In the impeller gap between the housing 1 and the impeller 3 an insert ring 12 is used, which is on the inside of the Housing 1 is attached. This insert ring 12 consists of a material that is used in normal operation, i.e. for ventilation of rooms with promotion of indoor air, wear-resistant and at least briefly during a one-off Smoke extraction is heat-resistant. The distance of the peaks the blades 8 from the inner wall of the housing 1 0.2 to 2%, and the distance between the tips of the blades 8 from the inside of the insert ring 12 is 0.0 to 0.5% of the impeller diameter. In normal or ventilation mode the impeller gap is fluidly correctly designed.

    Im Brandfall soll der Axialventilator Rauch- und Brandgase von erhöhter Temperatur fördern. Der Werkstoff des Einlegeringes 12 ist nun so gewählt, daß er mechanisch gegenüber dem Werkstoff des Laufrades 3 bei gegenseitiger Reibbeanspruchung zwischen Laufrad 3 und Einlegering 12 verschleißend ist. Da sich das Laufrad 3 unter dem Einfluß der erhöhten Temperatur des Fördermediums dehnt und dadurch im Durchmesser wächst, werden jetzt die Spitzen der Lauf schaufeln 8 den Einlegering 12 abreiben, ohne mit dem Gehäuse 1 in Berührung zu kommen. Die Dicke des Einlegeringes 12 ist so zu wählen, daß die Laufschaufeln 8 niemals an dem Gehäuse 1 anstreifen. Durch das Abtragen des Einlegeringes 12 stellt sich im Entrauchungsbetrieb bzw. im Brandfall ein Laufradspalt von optimaler Breite selbsttätig ein.In the event of a fire, the axial fan should remove smoke and fire gases from Promote elevated temperature. The material of the insert ring 12 is now chosen so that it is mechanical compared to the material of the impeller 3 with mutual friction stress between Impeller 3 and insert ring 12 is wearing. Since that Impeller 3 under the influence of the elevated temperature of the Pumped medium expands and thereby increases in diameter now the tips of the barrel 8 shovel the insert ring 12 rub without coming into contact with the housing 1. The The thickness of the insert ring 12 should be chosen so that the Never touch the blades 8 on the housing 1. By the Removal of the insert ring 12 turns in Smoke extraction operation or an impeller gap in the event of fire optimal width automatically.

    Die Wirkungsweise des Einlegeringes 12 ist in den Fig. 4 und 5 anschaulich gezeigt. In Fig. 4 ist der Axialventilator in seiner ursprünglichen Form dargestellt, wie er für den Lüftungsbetrieb in Frage kommt. Die Fig. 5 zeigt, daß sich der Durchmesser des Laufrades 3 aufgrund der angestiegenen Temperatur der heißen Rauch- und Brandgase vergrößert hat. Die Spitzen der Laufschaufeln 8 haben einen Teil des Einlegeringes 12 abgerieben, so daß wiederum ein Laufradspalt von geringer Höhe zwischen dem Laufrad 3 und dem nun veränderten Einlegering 12 besteht.The mode of operation of the insert ring 12 is shown in FIGS. 4 and 5 shown clearly. In Fig. 4 the axial fan is in depicted in its original form as for the Ventilation operation comes into question. Fig. 5 shows that the Diameter of the impeller 3 due to the increased Temperature of the hot smoke and combustion gases has increased. The Tips of the blades 8 have a part of the insert ring 12 rubbed, so that in turn an impeller gap of less Height between the impeller 3 and the now changed insert ring 12 exists.

    Die Vorderkantenebene des Einlegeringes 12 ist glatt und steht unter einem Winkel von 90° zur Achse der Welle 6 des Laufrades 3. Der Einlegering 12 ist bei dem größtmöglichen Schaufeleinstellwinkel möglichst bündig zur Laufradeintrittsebene 13 eingebaut, um eine einwandfreie Anströmung des Laufrades 3 zu gewährleisten. Bei kleineren Schaufeleinstellwinkeln steht die Schaufelvorderkante geringfügig über. Wird der Einlegering 12 nicht bündig zur Vorderkante der Laufschaufeln 8 plaziert und steht an der Anströmseite über, so wird im Brandfall dieser vorne überstehende Bereich nicht abgeschliffen. Dadurch kann es durch eine schlechte Anströmung des aufgeweiteten Laufrades 3 zu einem Strömungsabriß kommen. Das Laufrad 3 läuft dann in einer Sicke, die wie ein zu großer Laufradspalt wirkt. Ein geringer Überstand des Einlegeringes 12 von wenigen mm ist jedoch unschädlich.The front edge plane of the insert ring 12 is smooth and stands at an angle of 90 ° to the axis of the shaft 6 of the impeller 3. The insert ring 12 is the largest possible Bucket setting angle as flush as possible Impeller entry level 13 installed to a flawless To ensure flow to the impeller 3. With smaller ones The blade leading angle is the front edge of the blade slightly above. If the insert ring 12 is not flush with Front edge of the blades 8 placed and is on the On the inflow side, in the event of a fire, it becomes the front Protruding area not sanded. This allows it to go through a bad flow against the expanded impeller 3 come to a stall. The impeller 3 then runs in one Bead that looks like a wheel gap that is too large. A little The projection of the insert ring 12 is, however, a few mm harmless.

    Der Einlegering 12 erstreckt sich mindestens über den von den Laufschaufeln 8 bestrichenen Bereich. Er kann auch über die Abströmkante der Laufschaufeln 8 hinaus bis zur rückwärtigen Kante der Nabe 7 oder bis zu den Leitschaufeln 11 reichen. Die Abströmkante des Einlegeringes 12 kann ebenso wie die Anströmkante glatt sein oder konisch in den Durchmesser des Gehäuses 1 einlaufen.The insert ring 12 extends at least over that of the Blades 8 coated area. He can also use the Trailing edge of the blades 8 out to the rear Edge of the hub 7 or up to the guide vanes 11. The Trailing edge of the insert ring 12 can be just like that Leading edge be smooth or tapered in diameter Run in housing 1.

    Das für den Einlegering 12 verwendete Material ist biegsam und besteht vorzugsweise aus Fasermatten, die als Bahnen an die runden Form des Gehäuse 1 angepaßt werden. Der Einlegering 12 kann aus einer oder mehreren Schichten 14 übereinander aufgebaut werden, die an der Innenwand des Gehäuse 1 angeklebt oder mit Hilfe von Nieten 15 befestigt werden. Diese Nieten 15 werden im Entrauchungsbetrieb durch die Laufschaufeln 8 zusammen mit dem Einlegering 12 abgerieben.The material used for the insert ring 12 is flexible and consists preferably of fiber mats, which as webs to the Round shape of the housing 1 can be adjusted. The insert ring 12 can consist of one or more layers 14 one above the other be built that glued to the inner wall of the housing 1 or be fastened with the help of rivets 15. These rivets 15 are in smoke extraction mode by the blades 8 rubbed together with the insert ring 12.

    Claims (6)

    1. Axial fan for a combined ventilating and smoke-removing operation, comprising a rotor (3) rotating in a housing (1) and provided with rotor blades (8), wherein a rotor gap exists between the tips of the rotor blades (80 and the inner wall of the housing (1) and a spacer ring (12) is arranged in the rotor gap and fastened to the inner wall of the housing (1), characterised in that the spacer ring (12) consists of a heat-resistant material which in ventilating operation at normal room temperature enables a substantially wear-free operation of the rotor (3) relative to the spacer ring and in smoke-removing operation at burning temperature enables a wear-free operation of the rotor (3) relative to the spacer ring (12).
    2. Axial fan according to claim 1, characterised in that the spacing of the tips of the rotor blades (8) from the inner wall of the housing (1) amounts to 0.2 to 2% of the spacing of the tips of the rotor blades (8) from the inner side of the spacer ring (12) amounts to 0.0 to 0.5 % of the rotor diameter.
    3. Axial fan according to claim 1 or 2, characterised in that the spacer ring (12) is flush with the leading edge of the rotor blades (8) or protrudes slightly beyond the leading edge.
    4. Axial fan according to any one of claims 1 to 3, characterised in that the spacer ring (12) corresponds with at least the width of the region swept by the rotor (3).
    5. Axial fan according to any one of claims 1 to 4, characterised in that the spacer ring (12) projects beyond the leading edge of the rotor blades (8).
    6. Axial fan according to any one of claims 1 to 5, characterised in that the spacer ring (12) consists of flexible fibre mats shaped at the inner wall of the housing (1) and fastened there.
    EP98122961A 1997-12-13 1998-12-03 Axial fan for ventilating systems Expired - Lifetime EP0922862B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19755615 1997-12-13
    DE19755615A DE19755615A1 (en) 1997-12-13 1997-12-13 Axial fan for ventilation systems

    Publications (3)

    Publication Number Publication Date
    EP0922862A2 EP0922862A2 (en) 1999-06-16
    EP0922862A3 EP0922862A3 (en) 2000-04-12
    EP0922862B1 true EP0922862B1 (en) 2003-07-16

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    ID=7851917

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP98122961A Expired - Lifetime EP0922862B1 (en) 1997-12-13 1998-12-03 Axial fan for ventilating systems

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    EP (1) EP0922862B1 (en)
    AT (1) ATE245255T1 (en)
    DE (2) DE19755615A1 (en)

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    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE202015104163U1 (en) 2015-08-07 2016-11-10 Systemair GmbH Rotor blades for an axial fan

    Family Cites Families (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    GB851267A (en) * 1958-04-28 1960-10-12 Gen Motors Corp Improvements relating to axial-flow compressors
    GB879740A (en) * 1959-01-02 1961-10-11 Axia Fans Ltd Apparatus for expurging an enclosed space of gaseous media fouling the atmosphere therein
    DE4423447A1 (en) * 1994-07-05 1996-01-11 Turbo Lufttechnik Gmbh Axial ventilator with motor=driven fan
    DE4439726A1 (en) * 1994-11-09 1996-05-15 Siemens Ag Rotor wheel for electric ventilator or fan

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    ATE245255T1 (en) 2003-08-15
    EP0922862A2 (en) 1999-06-16
    DE19755615A1 (en) 1999-06-17
    EP0922862A3 (en) 2000-04-12
    DE59809019D1 (en) 2003-08-21

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