EP0166158A1 - Transverse-flow fan - Google Patents

Transverse-flow fan Download PDF

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Publication number
EP0166158A1
EP0166158A1 EP85105934A EP85105934A EP0166158A1 EP 0166158 A1 EP0166158 A1 EP 0166158A1 EP 85105934 A EP85105934 A EP 85105934A EP 85105934 A EP85105934 A EP 85105934A EP 0166158 A1 EP0166158 A1 EP 0166158A1
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EP
European Patent Office
Prior art keywords
cross
vortex
flow fan
fan
roller
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
EP85105934A
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German (de)
French (fr)
Other versions
EP0166158B1 (en
Inventor
Reinhold Hopfensperger
Klaus Täschner
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.)
Alcatel Lucent Deutschland AG
Original Assignee
Alcatel SEL AG
Standard Elektrik Lorenz AG
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.)
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Publication of EP0166158A1 publication Critical patent/EP0166158A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/02—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal
    • F04D17/04—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal of transverse-flow type
    • 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
    • F04D29/422—Discharge tongues
    • 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 a cross-flow fan consisting of a fan roller with blade edges running parallel to the axis of rotation, a guide plate partially encompassing the fan roller, a vortex former and the side parts wholly or partially surrounding the fan roller ends.
  • the cross-flow fan can produce a siren-like sound that clearly stands out from the usual noise.
  • This siren-like sound is known to the experts under the name "SchaufeL frequency peak"; the height of this tone can be: are calculated, where n is the number of revolutions of the fan roller per minute and z is the number of blades of the fan roller.
  • the invention is therefore based on the object of specifying measures which reduce the siren-like sound with a cross-flow fan operated at low to medium counterpressures or completely prevent such that no changes occur in the stable operating behavior and the air performance.
  • the new solution should also be effective for any length of cross-flow fan.
  • this object is achieved in that the vortex generator is provided on the suction side with a sharp-edged interfering body which extends at least over half its length, close to its greatest approximation to the circumference of the ventilation roll.
  • a cross-flow fan consists of the guide plate 1, the side parts 2, the fan roller 3 and the vortex former 4. If the fan roller 3 is rotated in the direction of the arrow 5 by a motor, not shown, then air becomes air sucked in from the space above the vortex former and blown out from the pressure chamber below the vortex former 4 in the direction of the arrow 6.
  • the fan roller should have diameter D.
  • the fan roller 4 which is rotated in the direction of the arrow 5, causes an intake flow in the space C above the vortex image 3.
  • the vortex flow 7 with the vortex center 8 is present in the fan roller 3 and below the vortex former 4 in space A is the flow on the pressure side.
  • the blades on their way from room A to room C cross room B, in which there is a strongly turbulent flow.
  • This strong turbulent flow has its cause in the disturbing body 9 on the vortex generator 4. It has the consequence that the blade does not come abruptly from the pressure into the suction zone, but that the transition takes place gradually.
  • room B can R.Hopfensperger-K.Täschner 11-4
  • the interfering body 9 can be a web which is stamped out of the vortex former 4 and which extends continuously or in sections over the entire length of the vortex former 4. It is not absolutely necessary for the interfering body 9 to have the same length as the vortex former, but it should be at least half the length of the vortex former.
  • the interference body can also be put on.
  • FIGS. 4 to 6 show three different embodiments of the interfering body 9.
  • the interfering body 9 is a web which is inclined in the direction of the direction of rotation of the fan roller (arrow 5).
  • the web is inclined counter to the direction of rotation of the fan roller and in the embodiment according to FIG. 6, the web is at right angles to the vortex forming surface.
  • the distance a between the ends of the webs and the vortex forming surface should be 0.01 to 0.08 times the fan roller diameter D.

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

Abstract

Bei einem Querstromlüfter ist der Wirbelbildner nahe seiner größten Annäherung an den Umfang der Lüfterwalze saugseitig mit sich wenigstens über die Hälfte seiner Länge erstreckendem scharfkantigen Störkörper versehen.In the case of a cross-flow fan, the vortex generator is provided on the suction side with its sharp-edged interfering body, which extends at least over half its length, near its closest approach to the circumference of the fan roller.

Description

Die Erfindung betrifft einen QuerstromLüfter, bestehend aus einer LüfterwaLze mit parallel zur Drehachse verLaufenden Schaufelkanten, einem die LüfterwaLze teilweise umfassenden LeitbLech, einem Wirbelbildner und den die Lüfterwalzenenden ganz oder teilweise umschließenden Seitenteilen.The invention relates to a cross-flow fan consisting of a fan roller with blade edges running parallel to the axis of rotation, a guide plate partially encompassing the fan roller, a vortex former and the side parts wholly or partially surrounding the fan roller ends.

Derartige Querstromlüfter sind als in Großserien gefertigte Massenprodukte bekannt, welche in großer ZahL in Haushaltsgeräten, Heizlüftern, Klimageräten, Konvektoren, Kopiergeräten, Projektoren, Einschüben elektrischer und elektronischer Geräte und dergleichen verwendet werden. Sie besitzen einen einfach aufgebauten Wirbelbildner, der folgende drei Funktionen zu erfüllen hat:

  • 1. AusbiLdung einer kontinuierlichen Wirbelströmung,
  • 2. StabiLisierung der Lage des Wirbelzentrums,
  • 3. LeiteLement für die Zuund Abströmung des Lüfters.
Such cross-flow fans are known as mass-produced mass products, which are used in large numbers in household appliances, fan heaters, air conditioners, convectors, copiers, projectors, plug-ins of electrical and electronic devices and the like. They have a simple vortex generator that has the following three functions:
  • 1. formation of a continuous vortex flow,
  • 2. Stabilization of the position of the vortex center,
  • 3. Control element for the inflow and outflow of the fan.

Das stabile BetriebsverhaLten des QuerstromLüfters bei den geforderten Leistungs- und Geräuschwerten setzt sowohl eine stabile Lage des Wirbelzentrums als auch mögtienst verlustarme Ansaug- und Ausblasströmung voraus. Eine wesentliche RoLLe bei der R.Hopfensperger-K.Täschner 11-4The stable operating behavior of the cross-flow fan with the required performance and noise values requires both a stable position of the vortex center and low-loss intake and exhaust flow. An essential role at R.Hopfensperger-K.Täschner 11-4

ErfüLLung dieser Voraussetzungen kann dabei die Leitwirkung der Wirbelbildnerwandungen spieLen. Ursache dafür ist, daß bei geringer bis mittlerer DrosseLung des Querstromlüfters das Wirbelzentrum sehr nahe am Uirbelbildner Liegt, wodurch auf der Saugseite des Wirbelbildners hohe Geschwindigkeiten des Strömungsmediums entstehen.Fulfillment of these requirements can play the guiding effect of the vortex walls. The reason for this is that at low to medium throttling of the cross-flow fan, the vortex center is very close to the vortex generator, which results in high velocities of the flow medium on the suction side of the vortex generator.

Dabei kann der QuerstromLüfter einen sirenenartigen Ton erzeugen, der aus dem üblichen Rauschen deutlich hervortritt. Dieser sirenenartige Ton ist unter dem Namen "SchaufeL-Frequenz-Spitze" den FachLeuten bekannt; die Höhe dieses Tones kann nach der FormeL:

Figure imgb0001

berechnet werden, wobei n die AnzahL der Umdrehungen der LüfterwaLze pro Minute und z die AnzahL der SchaufeLn der LüfterwaLze ist.The cross-flow fan can produce a siren-like sound that clearly stands out from the usual noise. This siren-like sound is known to the experts under the name "SchaufeL frequency peak"; the height of this tone can be:
Figure imgb0001
are calculated, where n is the number of revolutions of the fan roller per minute and z is the number of blades of the fan roller.

Verantwortlich für diesen sirenenartigen Ton sind die am Wirbelbildner vorbeilaufenden SchaufeLn der LüfterwaLze, welche an dieser SteLLe auf einem kleinen DrehwinkeL eine Wechselbeaufschlagung in folgender Weise erfahren.

  • a) die Strömungsrichtung erfährt eine Drehung von fast 1800
  • b) der üoergang vom Druckraum zum Saugraum, d.h. eine erhebliche Druckdifferenz.
Responsible for this siren-like sound are the blades of the fan roller passing by the vortex generator, which are subjected to alternating impacts in the following manner at a small angle of rotation.
  • a) the direction of flow undergoes a rotation of almost 1 80 0
  • b) the transition from the pressure chamber to the suction chamber, ie a considerable pressure difference.

Es sind aucn schon Vorschläge für die Reduzierung bzw. R.Hopfensperger-K.Täschner 11-4There are also suggestions for the reduction or R.Hopfensperger-K.Täschner 11-4

Verhinderung des sirenenartigen Tons gemacht worden, welche jedoch entweder bei besonders Langen QuerstromLüftern nicht mehr die erwünschte Wirkung aufweisen oder bei kurzen QuerstromLüftern eine Verminderung der tuft-Leistung bewirken.Prevention of the siren-like sound has been made, which, however, either no longer has the desired effect with particularly long cross-flow fans or, in the case of short cross-flow fans, results in a reduction in the tuft performance.

Der Erfindung Liegt daher die Aufgabe zugrunde, Maßnahmen anzugeben, welche den sirenenartigen Ton bei einem bei geringen bis mittleren Gegendrücken betriebenen Querstromlüfter vermindern oder vollständig in der Weise verhindern, daß sich am stabilen BetriebsverhaLten und der LuftLeistung keine Veränderungen ergeben. Die neue Lösung soll darüberhinaus bei jeder Baulänge des QuerstromLüfters wirksam sein.The invention is therefore based on the object of specifying measures which reduce the siren-like sound with a cross-flow fan operated at low to medium counterpressures or completely prevent such that no changes occur in the stable operating behavior and the air performance. The new solution should also be effective for any length of cross-flow fan.

Diese Aufgabe ist erfindungsgemäß dadurch gelöst, daß der Wirbelbildner nahe seiner größten Annäherung an den Umfang der LüftewrwaLze saugseitig mit einem sich wenigstens über die HäLfte seiner Länge erstreckenden scharfkantigen Störkörper versehen ist.According to the invention, this object is achieved in that the vortex generator is provided on the suction side with a sharp-edged interfering body which extends at least over half its length, close to its greatest approximation to the circumference of the ventilation roll.

VorteiLhafte AusgestaLtungen der Erfindung sind in den Ansprüchen 2 bis 5 enthalten, welche nachstehend anhand der Figuren 1 bis 6 erläutert sind. Es zeigen:

  • Fig. 1 in perspektivischer DarsteLLung den vorderen TeiL eines Querstromlüfters,
  • Fig. 2 den Querschnitt eines QuerstromLüfters,
  • Fig. 3 den StrömungsverLauf in einem QuerstromLüfter im Bereich des Wirbelbildners, R.Hopfensperger-K.Täschner 11-4
  • Fig. 4 eine Ausführungsform des Störkörpers,
  • Fig. 5 eine andere Ausführungsform des Störkörpers und
  • Fig. 6 eine weitere Ausführungsform des Störkörpers.
Advantageous embodiments of the invention are contained in claims 2 to 5, which are explained below with reference to FIGS. 1 to 6. Show it:
  • 1 is a perspective view of the front part of a cross-flow fan,
  • 2 shows the cross section of a cross-flow fan,
  • 3 shows the flow profile in a cross-flow fan in the area of the vortex generator, R.Hopfensperger-K.Täschner 11-4
  • 4 shows an embodiment of the interfering body,
  • Fig. 5 shows another embodiment of the interfering body and
  • Fig. 6 shows another embodiment of the interfering body.

Wie aus Fig. 1 ersichtlich ist, besteht ein QuerstromLüfter aus dem LeitbLech 1, den SeitenteiLen 2, der LüfterwaLze 3 und dem Wirbelbildner 4. Wenn die Lüfterwalze 3 von einem nicht gezeigten Motor in Richtung des PfeiLes 5 in Drehung versetzt wird, dann wird Luft aus dem Raum oberhalb des Wirbelbildners angesaugt und aus dem Druckraum unterhalb des Wirbelbildners 4 in Richtung des PfeiLes 6 ausgebLasen.As can be seen from FIG. 1, a cross-flow fan consists of the guide plate 1, the side parts 2, the fan roller 3 and the vortex former 4. If the fan roller 3 is rotated in the direction of the arrow 5 by a motor, not shown, then air becomes air sucked in from the space above the vortex former and blown out from the pressure chamber below the vortex former 4 in the direction of the arrow 6.

Aus dem Querschnitt des QuerstromLüfters gemäß Fig. 2 ist besonders das LeitbLech 1 deutlich zu erkennen. Die LüfterwaLze soLL den Durchmesser D besitzen.From the cross-section of the cross-flow fan according to FIG. 2, the guide plate 1 in particular can be clearly seen. The fan roller should have diameter D.

Anhand von Fig. 3 ist die Erfindung und deren Wirkungsweise verdeutlicht. Die in Richtung des PfeiLes 5 in Drehung versetzte LüfterwaLze 4 bewirkt in dem Raum C oberhalb des WirbeLbiLdners 3 eine Ansaugströmung. In der LüfterwaLze 3 ist die Wirbelströmung 7 mit dem WirbeLzentrum 8 vorhanden und unterhalb des Wirbelbildners 4 ist in dem Raum A die Strömung auf der Druckseite. Wie aus Fig. 3 ersichtlich, durchqueren die SchaufeLn auf ihrem Weg vom Raum A zum Raum C den Raum B, in dem eine stark turbulente Strömung herrscht. Diese stark turbulente Strömung hat ihre Ursache in dem Störkörper 9 auf dem Wirbelbildner 4. Sie hat zur FoLge, daß die SchaufeL nicht abrupt aus der Druckin die Saugzone gelangt, sondern da3 der übergang allmählich erfolgt. Im Raum B kann R.Hopfensperger-K.Täschner 11-43, the invention and its mode of operation is illustrated. The fan roller 4, which is rotated in the direction of the arrow 5, causes an intake flow in the space C above the vortex image 3. The vortex flow 7 with the vortex center 8 is present in the fan roller 3 and below the vortex former 4 in space A is the flow on the pressure side. As can be seen from FIG. 3, the blades on their way from room A to room C cross room B, in which there is a strongly turbulent flow. This strong turbulent flow has its cause in the disturbing body 9 on the vortex generator 4. It has the consequence that the blade does not come abruptly from the pressure into the suction zone, but that the transition takes place gradually. In room B can R.Hopfensperger-K.Täschner 11-4

ein gewisser DruckausgLeich zwischen A und C erfolgen. Die stark turbulente Strömung im Raum B entsteht an einer scharfen Kante des Störkör- pers 9, an welcher die Strömung abzureißen beginnt.a certain pressure equalization between A and C. The strongly turbulent flow in room B arises at a sharp edge of the disturbing body 9, at which the flow begins to break off.

Bei dem Störkörper 9 kann es sich um einen aus dem Wirbelbildner 4 herausgeprägten Steg handeln, der sich kontinuierLich oder in Abschnitten über die gesamte Länge des Wirbelbildners 4 erstreckt. Es ist nicht unbedingt erforderlich, daß der Störkörper 9 die gleiche Länge wie der Wirbelbildner besitzt, jedoch soLLte er wenigstens die halbe Länge des Wirbelbildners besitzen.The interfering body 9 can be a web which is stamped out of the vortex former 4 and which extends continuously or in sections over the entire length of the vortex former 4. It is not absolutely necessary for the interfering body 9 to have the same length as the vortex former, but it should be at least half the length of the vortex former.

AnsteLLe der Herausprägung kann der Störkörper auch aufgesetzt sein.Instead of being stamped out, the interference body can also be put on.

Die Figuren 4 bis 6 zeigen drei verschiedene Ausführungsformen des Störkörpers 9. Bei dem AusführungsbeispieL gemäß Fig. 4 ist der Störkörper 9 ein Steg, der in Richtung der Drehrichtung der LüfterwaLze (Pfeil 5) geneigt ist. Bei der Ausführungsform gemäß Fig. 5 ist der Steg entgegen der Drehrichtung der LüfterwaLze geneigt und bei der Ausführungsform gemäß Fig. 6 steht der Steg im rechten WinkeL zur Wirbelbildneroberfläche. Der Abstand a zwischen den Enden der Stege und der Wirbelbildneroberfläche soLLte das 0,01 bis 0,08-fache des LüfterwaLzendurchmessers D betragen.FIGS. 4 to 6 show three different embodiments of the interfering body 9. In the exemplary embodiment according to FIG. 4, the interfering body 9 is a web which is inclined in the direction of the direction of rotation of the fan roller (arrow 5). In the embodiment according to FIG. 5, the web is inclined counter to the direction of rotation of the fan roller and in the embodiment according to FIG. 6, the web is at right angles to the vortex forming surface. The distance a between the ends of the webs and the vortex forming surface should be 0.01 to 0.08 times the fan roller diameter D.

Durch Vergleichsmessungen an Ausführungsbeispielen, bei R.Hopfensperger-K.Täschner 11-4By comparative measurements on exemplary embodiments, at R.Hopfensperger-K.Täschner 11-4

denen die LüfterwaLze 20 SchaufeLn besaß und mit Drehzahlen von 1800 bis 2000 Umdrehungen pro Minute betrieben wurde, ist festgesteLLt worden, daß bei dem QuerstromLüfter, dessen Wirbelbildner den Störkörper aufwies, die Frequenzspitzen bei 600 bis 700 Hz sehr stark reduziert waren.to whom the fan roller had 20 blades and was operated at speeds of 1800 to 2000 revolutions per minute, it was found that the frequency peaks at 600 to 700 Hz were greatly reduced in the cross-flow fan, the vortex generator of which had the interfering body.

Claims (6)

1. Querstromlüfter, bestehend aus einer LüfterwaLze mit parallel zur Drehachse verlaufenden SchaufeLkanten, einem die LüfterwaLze teilweise umfassenden LeitbLech, einem Wirbelbildner und den die LüfterwaLzenenden ganz oder teilweise umschließenden SeitenteiLen. dadurch gekennzeichnet, daß der Wirbelbildner (4) nahe seiner größten Annäherung an den Umfang der LüfterwaLze (3) saugseitig mit einem sich wenigstens über die Hälfte seiner Länge erstreckenden scharfkantigen Störkörper (9) versehen ist.1. Cross-flow fan, consisting of a fan roller with blade edges running parallel to the axis of rotation, a guide plate that partially encompasses the fan roller, a vortex former and the side parts that completely or partially enclose the fan roller ends. characterized in that the vortex generator (4) is provided on the suction side with a sharp-edged interfering body (9) which extends at least over half its length, close to its closest approach to the circumference of the fan roller (3). 2. Querstromlüfter nach Anspruch 1, dadurch gekennzeichnet, daß der Störkörper aus einem senkrecht auf der OberfLäche des Wirbelbildners stehenden Steg besteht.2. Cross-flow fan according to claim 1, characterized in that the disturbing body consists of a web standing vertically on the surface of the vortex generator. 3. Querstromlüfter nach Anspruch 1, dadurch gekennzeichnet, daß der Störkörper aus einem entgegengesetzt zur Walzendrehrichtung geneigten Steg auf der Oberfläche des wirbelbildners besteht.3. Cross-flow fan according to claim 1, characterized in that the disturbing body consists of a web inclined opposite to the direction of rotation of the roll on the surface of the vortex former. R.Hopfensperger-K.Täschner 11-4R.Hopfensperger-K.Täschner 11-4 4. QuerstromLüfter nach Anspruch 1, dadurch gekennzeichnet, daß der Störkörper aus einem in Walzendrehrichtung geneigten Steg auf der Oberfläche des Wirbelbildners besteht.4. Cross-flow fan according to claim 1, characterized in that the interfering body consists of a web inclined in the direction of roll rotation on the surface of the vortex former. 5. QuerstromLüfter nach Anspruch 1, dadurch gekennzeichnet, daß der Abstand zwischen Störkörperende und der Oberfläche des Wirbelbildners das 0,01 bis 0,08-fache des Walzendurchmessers (D) beträgt.5. cross-flow fan according to claim 1, characterized in that the distance between the interfering body end and the surface of the vortex former is 0.01 to 0.08 times the roller diameter (D).
EP85105934A 1984-05-16 1985-05-14 Transverse-flow fan Expired EP0166158B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843418160 DE3418160A1 (en) 1984-05-16 1984-05-16 CROSS-FLOW FAN
DE3418160 1984-05-16

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EP0166158A1 true EP0166158A1 (en) 1986-01-02
EP0166158B1 EP0166158B1 (en) 1989-03-08

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JP (1) JPS60256594A (en)
DE (2) DE3418160A1 (en)

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US3223313A (en) * 1964-02-04 1965-12-14 Lau Blower Co Air moving device
DE1428130A1 (en) * 1964-10-03 1968-11-28 Ernst Heinkel Ag Fan, especially tangential fan
FR2266016A1 (en) * 1974-03-26 1975-10-24 Int Standard Electric Corp
DE2448362A1 (en) * 1974-10-10 1976-04-22 Standard Elektrik Lorenz Ag CROSS-FLOW FAN DESIGNED AS SMALL OR SMALL FAN WITH INCREASED AIR OUTLET SPEED IN THE EDGE ZONES NEAR THE END DISC

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10038753B4 (en) * 2000-08-09 2006-07-06 Ltg Aktiengesellschaft Tangential fan

Also Published As

Publication number Publication date
US4712976A (en) 1987-12-15
EP0166158B1 (en) 1989-03-08
JPS60256594A (en) 1985-12-18
JPH0448959B2 (en) 1992-08-10
DE3418160A1 (en) 1985-11-28
DE3568613D1 (en) 1989-04-13

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