EP0627560B1 - Radial blower - Google Patents

Radial blower Download PDF

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Publication number
EP0627560B1
EP0627560B1 EP94107578A EP94107578A EP0627560B1 EP 0627560 B1 EP0627560 B1 EP 0627560B1 EP 94107578 A EP94107578 A EP 94107578A EP 94107578 A EP94107578 A EP 94107578A EP 0627560 B1 EP0627560 B1 EP 0627560B1
Authority
EP
European Patent Office
Prior art keywords
radial fan
fan according
blade edge
outer blade
disk
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
EP94107578A
Other languages
German (de)
French (fr)
Other versions
EP0627560A1 (en
Inventor
Reinhold Hopfensperger
Martin Geiger
Rudolf Tungl
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.)
Motoren Ventilatoren Landshut GmbH
Original Assignee
Alcatel SEL 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.)
Filing date
Publication date
Application filed by Alcatel SEL AG filed Critical Alcatel SEL AG
Publication of EP0627560A1 publication Critical patent/EP0627560A1/en
Application granted granted Critical
Publication of EP0627560B1 publication Critical patent/EP0627560B1/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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/304—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the trailing edge of a rotor blade

Definitions

  • the invention relates to a radial fan consisting of a housing a spiral inner contour and a closed impeller, whose diameter is much larger than its flow exit width and which consists of a support plate, a cover plate and in between arranged backward curved blades, and the blades are tapered inside out as well as their length on the supporting disc is greater than on the cover disc.
  • Such a radial fan is known (EP-A-410 271).
  • the known Radial blower is for use in a device for conveying a gaseous medium provided which is a large Has flow resistance. That means the gaseous medium a relatively high back pressure of 400 to 450 Pascal has overcome and yet with an average volume flow of 7 to 10 1 / s should be delivered.
  • blower If the known blower is now used for an application, where it works against very low back pressures (e.g. 80-100 Pascal) and delivers a high volume flow (e.g. 10 1 / s), it can happen that there is a noise - especially amplified by sound pressure peaks generated.
  • very low back pressures e.g. 80-100 Pascal
  • a high volume flow e.g. 10 1 / s
  • a radial impeller is also known (DE-U-93 03 711), which consists of a Carrying disc, a cover plate and arranged between them Shovels exist.
  • the Diameter about four times the flow exit width, and the Bucket width is constant.
  • the efficiency and the Increase power density With the well-known radial impeller technical problem to be solved, the efficiency and the Increase power density.
  • the publication in which this known The radial impeller has no information on whether it is in is arranged in a housing and what shape it may have could.
  • the technical problem underlying the invention now exists in improving the known radial fan in such a way that the Subjectively perceived as very disturbing sound pressure peaks avoided without increasing the air noise (noise level) at the same time becomes.
  • the impeller consists of the support disk 1, the cover plate 2 and the blades 3. It can, for example, from Be made of plastic.
  • the embodiment of the blade edge shown in Fig. 2 has the shape an obtuse-angled triangle with a rounded tip.
  • Triangle is not an isosceles triangle, because the the left half of the triangle is slightly narrower than the right half. That's why the angles are different, which the edges 4 and 5 with the Connection line 6 between the ends of support plate 1 and Cover plate 2 (a parallel to the axis of rotation of the impeller) lock in.
  • the angle alpha has 43 degrees and the Angle beta 36 degrees.
  • the rounded tip 7 has for example a radius of curvature of 2 mm.
  • the embodiment of the blade edge according to FIG. 3 differs 2 in that the cover plate 2nd has a smaller diameter than the support disk 1. This is the edge 5 is somewhat longer than in FIG. 2.
  • the embodiment of the blade edge according to FIG. 4 does not contain any straight areas as in previous embodiments, but them is an arched curve, which is asymmetrical than the left part 8 has a different radius of curvature than the right part 9 owns.
  • the arched curve can also be symmetrical be, the radius of curvature is the same everywhere.
  • the blade edge In the exemplary embodiments of the blade edge according to FIGS. 5 and 6 it consists of a straight, oblique line 10 or 11. At 6 has the support plate 1 larger diameter than the cover plate 2. In the embodiment 5 is the reverse.
  • the outer blade edge is made of Trapezoidal, i.e. it consists of the straight line 12 parallel to Axis of rotation and the slope 13.
  • the slope can also on the support plate 1 and the straight line 12 lie on the cover plate 2.

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

Description

Die Erfindung betrifft ein Radialgebläse bestehend aus einem Gehäuse mit einer spiralförmigen Innenkontur und einem geschlossenen Gebläserad, dessen Durchmesser viel größer als seine Strömungsaustrittsbreite ist und welches aus einer Tragscheibe, einer Deckscheibe und dazwischen angeordneten rückwärts gekrümmten Schaufeln besteht, und die Schaufeln sich innen nach außen verjüngend ausgebildet sind sowie ihre Länge an der Tragscheibe größer als an der Deckscheibe ist.The invention relates to a radial fan consisting of a housing a spiral inner contour and a closed impeller, whose diameter is much larger than its flow exit width and which consists of a support plate, a cover plate and in between arranged backward curved blades, and the blades are tapered inside out as well as their length on the supporting disc is greater than on the cover disc.

Ein solches Radialgebläse ist bekannt (EP-A-410 271). Das bekannte Radialgebläse ist für den Einsatz in einer Vorrichtung zum Fördern eines gasförmigen Mediums vorgesehen, welche einen großen Strömungswiderstand aufweist. Das bedeutet, daß das gasförmige Medium einen verhältnismäßig hohen Gegendruck von 400 bis 450 Pascal zu überwinden hat und dennoch mit einem mittleren Volumenstrom von 7 bis 10 1/s geliefert werden soll.Such a radial fan is known (EP-A-410 271). The known Radial blower is for use in a device for conveying a gaseous medium provided which is a large Has flow resistance. That means the gaseous medium a relatively high back pressure of 400 to 450 Pascal has overcome and yet with an average volume flow of 7 to 10 1 / s should be delivered.

Wenn nun das bekannte Gebläse für einen Anwendungsfall eingesetzt wird, bei dem es gegen sehr niedrige Gegendrücke (z.B. 80-100 Pascal) arbeitet und einen hohen Volumenstrom (z.B. 10 1/s) liefert, kann es vorkommen, daß es ein - insbesondere durch Schalldruckspitzen verstärktes - Geräusch erzeugt. If the known blower is now used for an application, where it works against very low back pressures (e.g. 80-100 Pascal) and delivers a high volume flow (e.g. 10 1 / s), it can happen that there is a noise - especially amplified by sound pressure peaks generated.

Es ist auch ein Radiallaufrad bekannt (DE-U-93 03 711), welches aus einer Tragscheibe, einer Deckscheibe und zwischen diesen angeordneten Schaufeln besteht. Bei diesem bekannten Radiallaufrad beträgt der Durchmesser etwa das Vierfache der Strömungsaustrittsbreite, und die Schaufelbreite ist konstant. Mit dem bekannten Radiallaufrad soll das technische Problem gelöst werden, den Wirkungsgrad und die Leistungsdichte zu erhöhen. Die Druckschrift, in welcher dieses bekannte Radiallaufrad beschrieben ist, enthält keine Angaben darüber, ob es in einem Gehäuse angeordnet ist und welche Gestalt dieses ggf.haben könnte.A radial impeller is also known (DE-U-93 03 711), which consists of a Carrying disc, a cover plate and arranged between them Shovels exist. In this known radial impeller, the Diameter about four times the flow exit width, and the Bucket width is constant. With the well-known radial impeller technical problem to be solved, the efficiency and the Increase power density. The publication in which this known The radial impeller has no information on whether it is in is arranged in a housing and what shape it may have could.

Das der Erfindung zugrunde liegende technische Problem besteht nun darin, das bekannte Radialgebläse in der Weise zu verbessern, daß die subjektiv als sehr störend empfundenen Schalldruckspitzen vermieden werden, ohne daß gleichzeitig das Luftrauschen (Rauschpegel) verstärkt wird.The technical problem underlying the invention now exists in improving the known radial fan in such a way that the Subjectively perceived as very disturbing sound pressure peaks avoided without increasing the air noise (noise level) at the same time becomes.

Dieses technische Problem ist erfindungsgemäß dadurch gelöst, daß wenigstens ein Teil der äußeren Schaufelkante mit einer Parallelen zur Drehachse einen spitzen Winkel einschließt.This technical problem is solved according to the invention in that at least part of the outer blade edge with a parallel to Axis of rotation encloses an acute angle.

Durch Messungen an verschiedenen Ausführungsformen der vorgeschlagenen Lösung wurde festgestellt, daß durch diese Maßnahme das Auftreten von Schalldruckspitzen vollständig vermieden werden kann.By measurements on various embodiments of the proposed solution was found to be through this measure the occurrence of sound pressure peaks can be completely avoided.

Vorteilhafte Ausgestaltungen der Erfindung sind in den Ansprüchen 2 bis 9 enthalten. Sie ist nachstehend anhand der Figuren 1 bis 7 erläutert.Advantageous embodiments of the invention are in claims 2 to 9 contain. It is explained below with reference to FIGS. 1 to 7.

Es zeigen:

Fig. 1
einen Längsschnitt durch ein Gebläserad mit einer gemäß der Erfindung ausgebildeten äußeren Schaufelkante,
Fig. 2
einen vergrößerten Ausschnitt aus dem Gebläserad gemäß Fig. 1 im Bereich der äußeren Schaufelkante,
Fig. 3
einen vergrößerten Ausschnitt entsprechend Fig. 2 mit einer anderen Ausführungsform der äußeren Schaufelkante,
Fig. 4 bis Fig. 7
vergrößerte Ausschnitte entsprechend Fig. 2 mit weiteren Ausführungsformen der äußeren Schaufelkante.
Show it:
Fig. 1
2 shows a longitudinal section through an impeller with an outer blade edge designed according to the invention,
Fig. 2
2 shows an enlarged section from the impeller according to FIG. 1 in the region of the outer blade edge,
Fig. 3
2 with another embodiment of the outer blade edge,
4 to 7
enlarged sections corresponding to FIG. 2 with further embodiments of the outer blade edge.

Wie aus Fig. 1 zu erkennen ist, besteht das Gebläserad aus der Tragscheibe 1, der Deckscheibe 2 und den Schaufeln 3. Es kann beispielsweise aus Kunststoff hergestellt sein.As can be seen from Fig. 1, the impeller consists of the support disk 1, the cover plate 2 and the blades 3. It can, for example, from Be made of plastic.

Die in Fig. 2 gezeigte Ausführungsform der Schaufel kante hat die Form eines stumpfwinkligen Dreiecks mit einer abgerundeten Spitze. Bei dem Dreieck handelt es sich nicht um ein gleichschenkliges Dreieck, denn die linkle Hälfte des Dreiecks ist etwas schmaler als die rechte Hälfte. Deshalb sind auch die Winkel verschieden, welche die Kanten 4 und 5 mit der Verbindungslinie 6 zwischen den Enden von Tragscheibe 1 und Deckscheibe 2 (eine Parallele zur Drehachse des Gebläserades) einschließen. Beispielsweise hat der Winkel alpha 43 Winkelgrade und der Winkel beta 36 Winkelgrade. Die abgerundete Spitze 7 besitzt beispielsweise einen Krümmungsradius von 2 mm.The embodiment of the blade edge shown in Fig. 2 has the shape an obtuse-angled triangle with a rounded tip. In which Triangle is not an isosceles triangle, because the the left half of the triangle is slightly narrower than the right half. That's why the angles are different, which the edges 4 and 5 with the Connection line 6 between the ends of support plate 1 and Cover plate 2 (a parallel to the axis of rotation of the impeller) lock in. For example, the angle alpha has 43 degrees and the Angle beta 36 degrees. The rounded tip 7 has for example a radius of curvature of 2 mm.

Die Ausführungsform der Schaufelkante gemäß Fig. 3 unterscheidet sich von der Ausführungsform gemäß Fig. 2 dadurch, daß die Deckscheibe 2 einen geringeren Durchmesser als die Tragscheibe 1 aufweist. Dadurch ist die Kante 5 etwas länger als in Fig. 2.The embodiment of the blade edge according to FIG. 3 differs 2 in that the cover plate 2nd has a smaller diameter than the support disk 1. This is the edge 5 is somewhat longer than in FIG. 2.

Die Ausführungsform der Schaufelkante gemäß Fig. 4 enthält keine geraden Bereiche wie bei vorhergehenden Ausführungsformen, sondern sie ist eine bogenförmige Rundung, welche insofern asymmetrisch ausgebildet ist, als der linke Teil 8 einen anderen Krümmungsradius als der rechte Teil 9 besitzt. Die bogenförmige Rundung kann auch symmetrisch ausgebildet sein, der Krümmungsradius ist überall gleich.The embodiment of the blade edge according to FIG. 4 does not contain any straight areas as in previous embodiments, but them is an arched curve, which is asymmetrical than the left part 8 has a different radius of curvature than the right part 9 owns. The arched curve can also be symmetrical be, the radius of curvature is the same everywhere.

Bei den Ausführungsbeispielen der Schaufelkante gemäß Fig. 5 und Fig .6 besteht diese aus einer geraden, schräg verlaufenden Linie 10 bzw. 11. Bei dem Ausführungsbeispiel gemäß Fig. 6 besitzt die Tragscheibe 1 einen größeren Durchmesser als die Deckscheibe 2. Bei dem Ausführungsbeispiel gemäß Fig. 5 ist es umgekehrt.In the exemplary embodiments of the blade edge according to FIGS. 5 and 6 it consists of a straight, oblique line 10 or 11. At 6 has the support plate 1 larger diameter than the cover plate 2. In the embodiment 5 is the reverse.

Bei dem Ausführungsbeispiel gemäß Fig. 7 ist die äußere Schaufelkante aus Trapez ausgebildet, d.h. sie besteht aus der Geraden 12 parallel zur Drehachse und der Schräge 13. Bei dem in Fig. 7 gezeigten Ausführungsbeispiel liegt die Gerade an der Tragscheibe 1 und die Schräge 13 an der Deckscheibe 2. Die Schräge kann aber auch an der Tragscheibe 1 und die Gerade 12 an der Deckscheibe 2 liegen.In the exemplary embodiment according to FIG. 7, the outer blade edge is made of Trapezoidal, i.e. it consists of the straight line 12 parallel to Axis of rotation and the slope 13. In the shown in Fig. 7 Embodiment is the straight line on the support plate 1 and the slope 13 on the cover plate 2. The slope can also on the support plate 1 and the straight line 12 lie on the cover plate 2.

Claims (9)

  1. A radial fan, comprising a housing with a spiral-shaped inner contour and a closed impeller, the diameter of which is much greater than its flow outlet width (c) and which consists of a supporting disk (1), a cover disk (2) and rearwardly curved blades (3) arranged therebetween, the blades (3) being constructed so as to taper from the inside to the outside and the length thereof being greater at the supporting disk (1) than at the cover disk (2),
    characterised in that at least part of the outer blade edge forms an acute angle with a line parallel to the axis of rotation.
  2. A radial fan according to claim 1,
    characterised in that the outer blade edge takes the form of an obtuse-angled triangle.
  3. A radial fan according to claim 1,
    characterised in that the outer blade edge takes the form of a trapezium.
  4. A radial fan according to claim 1,
    characterised in that the outer blade edge takes the form of a curve (8, 9).
  5. A radial fan according to claim 1,
    characterised in that the outer blade edge comprises an oblique line (10, 11) extending between the ends of the supporting disk (1) and the cover disk (2).
  6. A radial fan according to claims 1 and 2,
    characterised in that the obtuse-angled vertex of the triangle takes the form of a rounded vertex (7).
  7. A radial fan according to claims 1 to 6,
    characterised in that the supporting disk (7) and the cover disk (2) have different diameters.
  8. A radial fan according to claim 4,
    characterised in that the curve (8,9) is of symmetrical construction.
  9. A radial fan according to claim 4,
    characterised in that the curve (8,9) is of asymmetrical construction.
EP94107578A 1993-06-04 1994-05-17 Radial blower Expired - Lifetime EP0627560B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4318580 1993-06-04
DE4318580A DE4318580A1 (en) 1993-06-04 1993-06-04 Radial fan

Publications (2)

Publication Number Publication Date
EP0627560A1 EP0627560A1 (en) 1994-12-07
EP0627560B1 true EP0627560B1 (en) 1998-07-01

Family

ID=6489633

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94107578A Expired - Lifetime EP0627560B1 (en) 1993-06-04 1994-05-17 Radial blower

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EP (1) EP0627560B1 (en)
DE (2) DE4318580A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2014393558B2 (en) * 2014-05-09 2017-09-07 Mitsubishi Electric Corporation Centrifugal blower and electric vacuum cleaner

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19918085A1 (en) * 1999-04-21 2000-10-26 Bsh Bosch Siemens Hausgeraete Blower with a spiral casing
ITAN20010008U1 (en) * 2001-03-01 2002-09-01 Giacalone Ignazio AIR CONVEYOR FOR HOUSEHOLD APPLIANCES ELECTRIC COOKER HOOD
DE10313054B4 (en) * 2003-03-24 2012-10-04 Motoren Ventilatoren Landshut Gmbh centrifugal blower
EP1940496B1 (en) 2005-10-28 2016-02-03 ResMed Motor Technologies Inc. Single or multiple stage blower and nested volute(s) and/or impeller(s) therefor
EP2090788A1 (en) * 2008-02-14 2009-08-19 Napier Turbochargers Limited Impeller and turbocharger
DE102016113589A1 (en) * 2016-07-22 2018-01-25 Ebm-Papst Landshut Gmbh blower
DE102020131789A1 (en) * 2019-12-09 2021-06-10 Löwenstein Medical Technology S.A. Impeller with reduced inertia for a respiratory therapy device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1341882A (en) * 1915-09-07 1920-06-01 Buffalo Forge Co Centrifugal fan
DE800238C (en) * 1948-10-02 1950-10-17 Maschf Augsburg Nuernberg Ag Blower wheel
DE3137554A1 (en) * 1981-09-22 1983-03-31 Wilhelm Gebhardt Gmbh, 7112 Waldenburg "RADIAL FAN"
DE3924281A1 (en) * 1989-07-22 1991-01-31 Standard Elektrik Lorenz Ag DEVICE FOR CONVEYING A GASEOUS MEDIUM
DE8909594U1 (en) * 1989-08-10 1989-10-05 Metronic Electronic GmbH, 7210 Rottweil Blower with an electric motor
DE9303711U1 (en) * 1993-03-13 1993-05-13 Babcock-BSH AG vormals Büttner-Schilde-Haas AG, 4150 Krefeld Radial impeller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2014393558B2 (en) * 2014-05-09 2017-09-07 Mitsubishi Electric Corporation Centrifugal blower and electric vacuum cleaner

Also Published As

Publication number Publication date
DE4318580A1 (en) 1994-12-08
EP0627560A1 (en) 1994-12-07
DE59406358D1 (en) 1998-08-06

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