EP0627560A1 - Radial blower - Google Patents

Radial blower Download PDF

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Publication number
EP0627560A1
EP0627560A1 EP94107578A EP94107578A EP0627560A1 EP 0627560 A1 EP0627560 A1 EP 0627560A1 EP 94107578 A EP94107578 A EP 94107578A EP 94107578 A EP94107578 A EP 94107578A EP 0627560 A1 EP0627560 A1 EP 0627560A1
Authority
EP
European Patent Office
Prior art keywords
fan according
radial fan
blade edge
outer blade
radial
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
EP94107578A
Other languages
German (de)
French (fr)
Other versions
EP0627560B1 (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 embodiment of the blade edge according to FIG. 4 does not contain any straight regions as in previous embodiments, but it is an arc-shaped curve which is asymmetrical in that the left part 8 has a different radius of curvature than the right part 9.
  • the arc-shaped curve can also be symmetrical, the radius of curvature is the same everywhere.

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

Abstract

The invention relates to a radial-flow blower known per se which consists of a casing having a scroll-like (spiral-shaped, volute) inner profile and a closed blower rotor (impeller). The diameter of the blower rotor is very much larger than its flow outlet width, and the closed blower rotor consists of a supporting disc (1), a back disc (2) and recurved blades (vanes) (3) arranged between these. To make the known radial-flow blower suitable for use with low back pressures and large volume flows it is proposed that the outer blade edges be designed so as to run obliquely. <IMAGE>

Description

Die Erfindung betrifft ein Radialgebläse bestehend aus einem Gehäuse mit einer spiralförmigen Innenkontur und einem geschlossenen Gebläserad, dessen Durchmesser sehr viel größer als seine Strömungsaustrittsbreite ist und welches aus einer Tragscheibe, einer Deckscheibe und dazwischen angeordneten rückwärts gekrümmten Schaufeln besteht.The invention relates to a radial fan consisting of a housing with a spiral-shaped inner contour and a closed impeller, the diameter of which is very much larger than its flow outlet width and which consists of a support plate, a cover plate and backward-curved blades arranged in between.

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 l/s geliefert werden soll.Such a radial fan is known (EP-A-410 271). The known radial fan is intended for use in a device for conveying a gaseous medium which has a large flow resistance. This means that the gaseous medium has to overcome a relatively high back pressure of 400 to 450 Pascal and still should be delivered with an average volume flow of 7 to 10 l / s.

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 l/s) liefert, kann es vorkommen, daß es ein - insbesondere durch Schalldruckspitzen verstärktes - Geräusch erzeugt.If the known blower is used for an application in which it works against very low back pressures (e.g. 80-100 Pascal) and delivers a high volume flow (e.g. 10 l / s), it can happen that - especially due to sound pressure peaks amplified - noise generated.

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 on which the invention is based is to improve the known radial fan in such a way that the sound pressure peaks, which are subjectively perceived as very disturbing, are avoided without simultaneously increasing the air noise (noise level).

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 a part of the outer blade edge encloses an acute angle with a parallel to the axis of rotation.

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, it was found that the occurrence of sound pressure peaks can be completely avoided by this measure.

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 contained in claims 2 to 9. 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,
Fig. 4 to Fig. 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 plate 1, the cover plate 2 and the blades 3. It can be made of plastic, for example.

Die in Fig. 2 gezeigte Ausführungsform der Schaufelkante hat die Form eines stumpfwinkligen Dreiecks mit einer abgerundeten Spitze. Bei dem Dreieck handelt es sich nicht um ein gleichschenkliges Dreieck, denn die linke 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 of an obtuse-angled triangle with a rounded tip. The triangle is not an isosceles triangle, because the left half of the triangle is slightly narrower than the right half. Therefore, the angles are different, which include the edges 4 and 5 with the connecting line 6 between the ends of the support plate 1 and cover plate 2 (a parallel to the axis of rotation of the impeller). 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 from the embodiment according to FIG. 2 in that the cover disk 2 has a smaller diameter than the support disk 1. As a result, 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 regions as in previous embodiments, but it is an arc-shaped curve which is asymmetrical in that the left part 8 has a different radius of curvature than the right part 9. The arc-shaped curve can also be symmetrical, 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, this consists of a straight, oblique line 10 or 11. In the exemplary embodiment according to FIG. 6, the support disc 1 has a larger diameter than the cover disc 2. In the exemplary embodiment according to FIG Fig. 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 formed from trapezoid, i.e. it consists of the straight line 12 parallel to the axis of rotation and the bevel 13. In the exemplary embodiment shown in FIG. 7, the straight line lies on the support disk 1 and the bevel 13 on the cover disk 2. However, the bevel can also be on the support disk 1 and the straight line 12 lie on the cover plate 2.

Claims (9)

Radialgebläse bestehend aus einem Gehäuse mit einer spiralförmigen Innenkontur und einem geschlossenen Gebläserad, dessen Durchmesser sehr viel größer als seine Strömungsaustrittsbreite ist und welches aus einer Tragscheibe, einer Deckscheibe und dazwischen angeordneten rückwärts gekrümmten Schaufeln besteht,
dadurch gekennzeichnet, daß wenigstens ein Teil der äußeren Schaufelkante mit einer Parallelen zur Drehachse einen spitzen Winkel einschließt.Radial blowers consisting of a housing with a spiral-shaped inner contour and a closed impeller, the diameter of which is much larger than its flow outlet width and which consists of a support plate, a cover plate and backward-curved blades arranged between them
characterized in that at least a part of the outer blade edge encloses an acute angle with a parallel to the axis of rotation. Radialgebläse nach Anspruch 1,
dadurch gekennzeichnet, daß die äußere Schaufelkante als stumpfwinkliges Dreieck ausgebildet ist.Radial fan according to claim 1,
characterized in that the outer blade edge is formed as an obtuse-angled triangle. Radialgebläse nach Anspruch 1,
dadurch gekennzeichnet, daß die äußere Schaufelkante als Trapez ausgebildet ist.Radial fan according to claim 1,
characterized in that the outer blade edge is designed as a trapezoid. Radialgebläse nach Anspruch 1,
dadurch gekennzeichnet, daß die äußere Schaufelkante als Rundung (8, 9) ausgebildet ist.Radial fan according to claim 1,
characterized in that the outer blade edge is designed as a curve (8, 9). Radialgebläse nach Anspruch 1,
dadurch gekennzeichnet, daß die äußere Schaufelkante eine zwischen den Enden von Tragscheibe (1) und Deckscheibe (2) verlaufende schräge Linie (10, 11) ist.Radial fan according to claim 1,
characterized in that the outer blade edge is an oblique line (10, 11) extending between the ends of the support disc (1) and cover disc (2). Radialgebläse nach den Ansprüchen 1 und 2,
dadurch gekennzeichnet, daß die stumpfwinklige Spitze des Dreiecks als abgerundete Spitze (7) ausgebildet ist.Radial fan according to claims 1 and 2,
characterized in that the obtuse-angled tip of the triangle is designed as a rounded tip (7). Radialgebläse nach den Ansprüchen 1 bis 6,
dadurch gekennzeichnet, daß die Tragscheibe (7) und die Deckscheibe (2) verschiedene Durchmesser aufweisen.Radial fan according to claims 1 to 6,
characterized in that the supporting disc (7) and the cover disc (2) have different diameters. Radialgebläse nach Anspruch 4,
dadurch gekennzeichnet, daß die Rundung (8, 9) symmetrisch ausgebildet ist.Radial fan according to claim 4,
characterized in that the curve (8, 9) is symmetrical. Radialgebläse nach Anspruch 4,
dadurch gekennzeichnet, daß die Rundung (8, 9) asymmetrisch ausgebildet ist.Radial fan according to claim 4,
characterized in that the curve (8, 9) is asymmetrical.
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 true EP0627560A1 (en) 1994-12-07
EP0627560B1 EP0627560B1 (en) 1998-07-01

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DE (2) DE4318580A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1236908A2 (en) * 2001-03-01 2002-09-04 ELIN S.r.l. Motorised fan for suction hoods
EP1046822A3 (en) * 1999-04-21 2002-10-09 BSH Bosch und Siemens Hausgeräte GmbH Blower and scroll casing
EP1462658A2 (en) * 2003-03-24 2004-09-29 ebm-papst Landshut GmbH Radial fan
WO2009101376A1 (en) * 2008-02-14 2009-08-20 Napier Turbochargers Limited Impeller and turbocharger
US9512729B2 (en) 2005-10-28 2016-12-06 Resmed Motor Technologies Inc. Single or multiple stage blower and nested volute(s) and/or impeller(s) therefor
EP3273066A1 (en) * 2016-07-22 2018-01-24 ebm-papst Landshut GmbH Blower wheel
US20210170125A1 (en) * 2019-12-09 2021-06-10 Loewenstein Medical Technology S.A. Impeller with reduced mass inertia for a respiration therapy appliance

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015170401A1 (en) * 2014-05-09 2015-11-12 三菱電機株式会社 Centrifugal blower and electric vacuum cleaner

Citations (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
GB2105791A (en) * 1981-09-22 1983-03-30 Gebhardt Gmbh Wilhelm >Centrifugal fan
DE8909594U1 (en) * 1989-08-10 1989-10-05 Metronic Electronic GmbH, 7210 Rottweil Blower with an electric motor
EP0410271A2 (en) * 1989-07-22 1991-01-30 Alcatel SEL Aktiengesellschaft Feed device for gaseous medium
DE9303711U1 (en) * 1993-03-13 1993-05-13 Babcock-BSH AG vormals Büttner-Schilde-Haas AG, 4150 Krefeld Radial impeller

Patent Citations (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
GB2105791A (en) * 1981-09-22 1983-03-30 Gebhardt Gmbh Wilhelm >Centrifugal fan
EP0410271A2 (en) * 1989-07-22 1991-01-30 Alcatel SEL Aktiengesellschaft Feed device for 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 (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1046822A3 (en) * 1999-04-21 2002-10-09 BSH Bosch und Siemens Hausgeräte GmbH Blower and scroll casing
EP1236908A2 (en) * 2001-03-01 2002-09-04 ELIN S.r.l. Motorised fan for suction hoods
EP1236908A3 (en) * 2001-03-01 2003-08-27 ELIN S.r.l. Motorised fan for suction hoods
EP1462658A2 (en) * 2003-03-24 2004-09-29 ebm-papst Landshut GmbH Radial fan
EP1462658A3 (en) * 2003-03-24 2005-12-14 ebm-papst Landshut GmbH Radial fan
US9512729B2 (en) 2005-10-28 2016-12-06 Resmed Motor Technologies Inc. Single or multiple stage blower and nested volute(s) and/or impeller(s) therefor
US10267320B2 (en) 2005-10-28 2019-04-23 Resmed Motor Technologies Inc. Single or multiple stage blower and nested volute(s) and/or impeller(s) therefor
US10865796B2 (en) 2005-10-28 2020-12-15 Resmed Motor Technologies Inc. Single or multiple stage blower and nested volute(s) and/or impeller(s) therefor
US10871165B2 (en) 2005-10-28 2020-12-22 Resmed Motor Technologies Inc. Single or multiple stage blower and nested volute(s) and/or impeller(s) therefor
US20100322781A1 (en) * 2008-02-14 2010-12-23 Napier Turbochargers Limited Impeller and turbocharger
CN101952603A (en) * 2008-02-14 2011-01-19 内皮尔涡轮增压器有限公司 Impeller and turbocharger
WO2009101376A1 (en) * 2008-02-14 2009-08-20 Napier Turbochargers Limited Impeller and turbocharger
EP3273066A1 (en) * 2016-07-22 2018-01-24 ebm-papst Landshut GmbH Blower wheel
US20210170125A1 (en) * 2019-12-09 2021-06-10 Loewenstein Medical Technology S.A. Impeller with reduced mass inertia for a respiration therapy appliance
EP3835592A1 (en) * 2019-12-09 2021-06-16 Löwenstein Medical Technology S.A. Fan wheel with reduced mass inertia for breathing therapy apparatus
US11925755B2 (en) * 2019-12-09 2024-03-12 Loewenstein Medical Technology S.A. Impeller with reduced mass inertia for a respiration therapy appliance

Also Published As

Publication number Publication date
EP0627560B1 (en) 1998-07-01
DE4318580A1 (en) 1994-12-08
DE59406358D1 (en) 1998-08-06

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