EP1462658B1 - Ventilateur radial - Google Patents

Ventilateur radial Download PDF

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Publication number
EP1462658B1
EP1462658B1 EP04400016A EP04400016A EP1462658B1 EP 1462658 B1 EP1462658 B1 EP 1462658B1 EP 04400016 A EP04400016 A EP 04400016A EP 04400016 A EP04400016 A EP 04400016A EP 1462658 B1 EP1462658 B1 EP 1462658B1
Authority
EP
European Patent Office
Prior art keywords
wheel
radial fan
fan according
reference surface
leading edge
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
EP04400016A
Other languages
German (de)
English (en)
Other versions
EP1462658A2 (fr
EP1462658A3 (fr
Inventor
Reinhold Hopfensperger
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.)
Ebm Papst Landshut GmbH
Original Assignee
Ebm Papst Landshut GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Ebm Papst Landshut GmbH filed Critical Ebm Papst Landshut GmbH
Publication of EP1462658A2 publication Critical patent/EP1462658A2/fr
Publication of EP1462658A3 publication Critical patent/EP1462658A3/fr
Application granted granted Critical
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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
    • F04D29/281—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
    • 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
    • F04D29/4226—Fan casings
    • F04D29/4233—Fan casings with volutes extending mainly in axial or radially inward direction

Definitions

  • a radial fan which has in the pressure chamber a guide for guiding the air flow in the pressure chamber towards the air outlet. This allows a higher specific air power. Also, the noise is reduced. With regard to further necessary increases in efficiency and increasingly stringent requirements in the area of noise development, however, this arrangement can still be improved.
  • this is the flush termination of the air outlet openings of the impeller with the so-called ground reference surface. This is generally defined as the area of the floor, if it had no recesses in the form of the hollow cylindrical pot and (optionally) the pressure chamber extension.
  • the air taken in by the wheel during operation can thus enter the airspace directly without having to overcome an obstacle.
  • this arrangement prevents excess air ejected from the wheel from getting underneath the wheel support plate, which would reduce the efficiency of air delivery.
  • the axis of rotation of the wheel or the imaginary center of rotation of the air in the spiral-shaped pressure chamber is to be understood as “axle” or “axially”.
  • the bottom reference surface is an imaginary surface which would be the interior surface of the housing if the bottom did not have recesses such as the hollow cylindrical pot and / or the axial extension of the pressure space.
  • the floor reference surface will be used as a reference surface to describe various elements of the radial fan of the present invention.
  • the radial direction in the sense of the present invention is a direction extending radially away from the axis.
  • the axial direction is a direction parallel to the axis in one of two possible directions.
  • the wheel has blades which have an arrow-shaped blade outer edge at the wheel circumference.
  • the blade outer edge which may have, for example, the outermost point (blade tip) approximately in its center, the air conveyed by the blades is expelled at an angle which prevents a synchronous impact of the entire air front on the housing wall and thus the operating noise is reduced.
  • the exit angle which forms a tangent at the outer edge with a tangent at the circumference of the wheel at the point of the outer edge, is preferably ⁇ 35 °, for example 25-30 ° and in a particularly preferred embodiment 22 °.
  • the entrance angle which forms a tangent to an inner edge of the blade with a tangent to the circumference of the wheel at the point of the inner edge, is preferably 17-35 °, in particular, this initial angle can be 24 °.
  • the blades may be bent in an S-shape (the wheel or the air inlet) when viewed from above, wherein the exit angle is then preferably approximately 90 ° and the air output is increased with lower efficiency.
  • All blades of a wheel can have the same length and thus begin or end at circumferences with respect to the axis of rotation of the wheel, which for all blades are the same size.
  • alternately shorter and longer blades are arranged in the wheel, wherein the outer edges are all on the same circumference and the inner edges of the blades are radially offset from each other.
  • the tongue is arranged, which extends in the circumferential direction in the pressure chamber substantially, and formed by the tongue leading edge forms in lateral projection over its course different angles with the bottom reference plane of the blower.
  • a tongue between the area in which the wheel rotates, and the air outlet, radially to the wheel into the housing in order to dissipate the airflow in the pressure chamber through the air outlet can, without too much of the Let the air get carried away again by the spinning wheel.
  • Such a tongue basically serves to separate the pressure space from the rest of the housing space, i. the area of the housing in which there is a pressure which is lower than that at the end of the pressure chamber in front of the air outlet.
  • the inventors have found that the use of steps and plateaus, even in combination, in the leading edge is particularly advantageous. It is therefore preferred that the leading edge in lateral projection forms at least one stage, in which over an area of the leading edge of the angle with the ground reference surface is substantially 90 °.
  • leading edge in lateral projection forms at least one plateau in which the angle with the ground reference surface is substantially 0 ° over a region of the leading edge.
  • the cover disk of the wheel has an axially arranged air intake opening and the cover disk on the wheel of the air intake opening is bulged in the axial direction of the housing and on the circumference of the air inlet, a U-shaped profile is provided with which the edge of the air intake opening is sealingly engaged ,
  • the air inlet bead has a spatially curved guide surface over its course. As a result, the sucked medium is forwarded streamlined.
  • the radial fan according to the invention is equipped with a two-part housing, in which the housing is divided in a plane parallel to the plane of rotation and the housing peripheral wall is disposed substantially over its entire width at one of these parts, it can be particularly favorable be that the inlet bead and the Ausleitwulst are arranged as a substantially one-piece elevation on the designed as a substantially flat lid part of the housing.
  • the bottom of the hollow cylindrical pot has a bevelled, inclined or curved shape, so that the depression in the axis region is smaller.
  • the curvature of the bottom of the pot improves the stability of the housing in this area.
  • the radial fan according to the invention is preferably used in composite systems, which consist of other, interacting components in addition to the radial fan.
  • composite systems which consist of other, interacting components in addition to the radial fan.
  • pneumatic composite systems in which the control is pneumatic by vacuum
  • electrical interconnected systems in which, in the case of a gas burner, a probe measures the exhaust gas and a computer calculates and electrically controls the gas supply
  • mass flow systems in which the air mass and gas mass are measured and controlled by computer.
  • Fig. 1 the housing 1 of a radial fan is shown in a perspective plan view of the interior.
  • the radial blower has a lid 2 which can be placed on the housing (FIG. Fig. 3 ) and an impeller 3 on.
  • the bottom portion 6 of the housing 1 is surrounded by spiral pressure space 8.
  • the pressure chamber 8 has its greatest width in the radial direction at an air outlet 5 and narrows in a spiral manner on the circumference of the bottom portion 6 from the air outlet 5 away.
  • the bottom portion 6 is in addition to the pressure chamber 8 from the bottom reference surface 7 and a relative to the bottom reference surface 7 depressed hollow cylindrical pot portion 9, which serves the partial inclusion of the wheel 3.
  • Opening 22 in the axis of the bottom portion 6 serves to carry out a drive axle (not shown) for rotating the wheel 3.
  • the pressure chamber 8 has an axial extension, which over the entire or substantially entire region of the pressure chamber 8, especially where there is also a radial extension of the pressure chamber 8 in the spiral extends.
  • the wheel blower according to the invention is further provided with a tongue 18.
  • This tongue 18 extends substantially in the circumferential direction in the pressure chamber 8 inside.
  • the tongue 18 has a leading edge 20, which has a continuous non-linear curve, wherein portions of the leading edge 20 have different slopes.
  • the leading edge 20 includes sections of their course with the bottom reference surface 7 of the fan different angles.
  • the tongue 18 has a minimum height on the wall opposite the air inlet 4 and a maximum height in the area of the air outlet 5.
  • the extension can have a projection or one or more steps 21 approximately in the middle of its leading edge 20 as the expression of the different angles.
  • a circumferential on one side 25 of the housing 1 groove 26 serves to receive an O-ring seal for sealing of the housing 1 and cover 2 to each other.
  • Fig. 3 shows a lid 2 for use with the housing 1 of Fig. 1 and 2
  • Air inlet 4 serves for the suction of air through the wheel.
  • a ramp 27 is arranged so that it can bridge the distance of the upper edge of the side wall 25 of the housing 1 from the opening of the air outlet 5 without edges (see. Fig. 1 ). In this way turbulence and / or backwater can be avoided at this edge. In other embodiments of the present invention, such an edge may be avoided other than by way of ramp 27.
  • the housing 1 final cover 2 may be designed in a special way to meet a mounting requirements and to avoid other resonant vibrations. As a result of the requirement, at least three threaded bores can be provided on the cover 2 'in the area of the inlet opening. In order that the geometry of the cover 2 'created by the required accumulation of material for the screw-in depth does not lead to problems in the production of the cover or in the pressure chamber to a negative influence on the flow conditions, the material thickening in a circumferential, inwardly opening groove 31' is formed , so that a kind of labyrinth seal is created.
  • the lid may have a shape in the manner of a plate, resulting in an additional radial extension for the pressure chamber.
  • the tongue 18 rises from the bottom reference surface 7 at a predetermined angle, so that the tongue edge extends to a height of 2/3 of the exit width of the wheel is substantially rectilinear.
  • This first section extends over a distance of about 20 to 40 mm, depending on the diameter of the wheel.
  • This first section includes a substantially vertical step whose height is about 1/3 of the outlet width.
  • This stage is followed by a substantially horizontal tongue portion, which is in a predetermined ratio to the exit width, here about 1.5 X exit width.
  • the last section of the tongue rises relatively steeply.
  • the inner edges 19 of the blades 13 are preferably obliquely inclined to a vertical of the support plate 12, preferably at an angle between 80 and 60 °, for example, as shown here, 76 °.
  • the hub 23 has an axle channel 24, which is arranged axially above the opening 22 and serves to receive a drive shaft.
  • a U-shaped profile 31 is arranged in the cover 2 on the circumference of the air inlet 4, in which a bulged inner edge 11 b of the cover plate 11 engages so that a labyrinth seal is formed, which is to minimize a shunt of air from the pressure chamber 8 back to the air inlet 4 ,
  • the bottom of the hollow-cylindrical pot region 9 is arched to improve the stability. In this way, it is additionally achieved that the surface area receives a reduced vibration capability and the resonance vibrations are reduced.
  • the cavity formed between the support plate 12 and the bottom in the region of the axis can be kept small, whereby pressure losses are avoided.
  • Fig. 6 shows a further embodiment of a wheel 3 according to the present invention.

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

Claims (19)

  1. Ventilateur radial avec un carter (1, 2) et une roue de ventilation (3) disposée axialement, le carter présentant une entrée d'air (4) disposée axialement, une sortie d'air (5), une zone de fond (6) avec une surface de référence de fond (7) et une chambre de pression en forme de spirale amenée autour de la roue, chambre qui s'étend jusqu'à la sortie d'air et donc aussi bien dans le sens radial que dans le sens axial en direction de la sortie d'air (6),
    et la roue (3) présentant un disque de recouvrement (11) tourné vers l'entrée d'air (4) et un disque support (12),
    une extension axiale et radiale étant formée sur le carter sur au moins au-delà de 180° de la périphérie de spirale, caractérisé en ce que dans la zone de fond (6) dans le sens axial au-delà de la surface de référence de fond (7), il est plongé une zone de pot cylindrique creuse (9) dans laquelle est insérée la roue (3), en ce qu'une face interne (12a) du disque support (12) de la roue (3) s'étend affleure avec la surface de référence de fond (7),
    dans le carter (1) une languette (18) étant disposée qui s'étend dans la chambre de pression (8) sensiblement dans le sens périphérique et forme un bord d'écoulement entrant (20) réalisé par la languette (18) en projection latérale au-dessus de sa courbe différents angles avec la surface de référence de fond (7).
  2. Ventilateur radial selon la revendication 1, caractérisé en ce que la chambre de pression s'étend dans le sens axial au-delà de la surface de référence de fond (7).
  3. Ventilateur radial selon la revendication 1 ou 2, caractérisé en ce que la le carter présente un couvercle (2) et que la chambre de pression (8) s'étend dans le sens axial et pénètre à l'intérieur du couvercle (2).
  4. Ventilateur radial selon l'une des revendications 1 á 3, caractérisé en ce que la roue (3) présente des aubes (13, 14) qui sont sur la périphérie de roue (15) un bord externe (16) d'aubes en forme de flèche.
  5. Ventilateur radial selon la revendication 4, caractérisé en ce que les bords externes (16) des aubes (13, 14) font saillie dans le sens radial au delà de la périphérie (15) de disque de couverture (11) et du disque support (12) de la roue.
  6. Ventilateur radial selon la revendication 4 ou 5, caractérisé en ce que les aubes (13) sont courbées vers l'arrière par rapport à la direction de rotation de service de la roue (3).
  7. Ventilateur radial selon la revendication 4, caractérisé en ce que l'angle de sortie (β2) qu'une tangente (T1) forme sur le bord externe (16) de l'aube (13, 14) avec une tangente (T2) sur la périphérie (15) de la roue (3) sur le point du bord externe (16), est égal ou inférieur á 35°.
  8. Ventilateur radial selon l'une des revendications 1 á 7, caractérisé en ce que l'angle d'entrée (β1), que forme une tangente (T3) sur un bord interne (18) de l'aube (13, 14) avec une tangente (T4) sur une périphérie de la roue (3) au point du bord interne (18), est 17-35°.
  9. Ventilateur radial selon l'une des revendications 4 á 8, caractérisé en ce qu'au moins une partie des aubes (13, 14) est courbée en forme de S en vue de dessus, et présente un angle de sortie (β2) inférieure ou égale à 90°.
  10. Ventilateur radial selon l'une es revendications 4 á 9, caractérisée en ce que la roue (3) présente en alternance des aubes plus courtes (14) et plus longues (13).
  11. Ventilateur radial selon la revendication 1, caractérisé en ce que le bord d'écoulement (20) forme en projection latérale au moins un palier où l'angle avec la surface de référence de fond (7) au dessus d'une zone du bord d'écoulement (20) s'élève essentiellement 90°.
  12. Ventilateur radial selon la revendication 1 ou 11, caractérisé en ce que le bord d'arrivée d'écoulement (20) forme en projection latérale au moins un plateau où l'angle avec la surface de référence de fond (7) est au moins égale à 0° sur une zone du bord d'arrivée d'écoulement (20).
  13. Ventilateur radial selon l'une des revendications 11 ou 12, caractérisé en ce que la zone verticale du bord présente une hauteur de 4 mm, en ce que le plateau s'étend environ sur 12 mm au dessus de la surface de référence de fond sur une longueur d'environ 18 mm, en ce que la zone inclinée du bord d'arrivée d'écoulement mesuré depuis son début sur le plan de référence de fond jusqu'au palier, est de 20 mm et en ce que la hauteur entre le plateau et l'extrémité supérieure du bord d'écoulement est de par exemple 16 mm, toutes les d'indications de mesure se référant á une largueur de sortie de la roue d'environ 12 mm.
  14. Ventilateur radial selon la revendication 1, caractérisé en ce que le bord d'arrivée d'écoulement (20) présente une saillie (21).
  15. Ventilateur radial selon la revendication 14, caractérisé en ce que la roue (3) présente des aubes (13, 14) qui ont sur la périphérie de roue (15) un bord externe (16) de l'aube en forme de flèche et la pointe d'aube (17) ne présente pas sur le bord externe d'aube (16), la même distance orthogonale par rapport à la surface de référence de fond (7) que la pointe de la saillie (21) du bord d'écoulement (20).
  16. Ventilateur radial selon l'une des revendications précédentes, caractérisé en ce que le carter présente un couvercle (2) et que sur le couvercle (2) il est disposé une rampe de guidage d'air (25) qui provoque un transfert continu entre le couvercle (2) et la sortie d'air (5).
  17. Ventilateur radial selon l'une des revendications précédentes, caractérisé en ce que le disque de recouvrement de la roue présente une ouverture d'aspiration d'air (3a) disposé axialement et le disque de recouvrement (3) est bombé sur le bord (3b) de l'ouverture d'aspiration d'air dans le sens axial par rapport au carter et qu'il est prévu sur la périphérie de rentré d'air (4) un profil en forme de U (31) avec lequel le bord (3b) de l'ouverture d'aspiration d'air (3a) s'engage de manière étanche.
  18. Ventilateur radial selon l'une des revendications précédentes, caractérisé en ce que le fond de la zone de fond cylindrique creuse (9) présente une forme inclinée, bombée ou ondulée respectivement divergeant d'un plan rectiligne.
  19. Ventilateur radial selon l'une des revendications précédentes, caractérisé en ce que pour la génération d'une sous-pression derrière le disque support, la roue présente des perçages dans le disque support (12) dans la zone du moyeu.
EP04400016A 2003-03-24 2004-03-22 Ventilateur radial Expired - Lifetime EP1462658B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10313054A DE10313054B4 (de) 2003-03-24 2003-03-24 Radialgebläse
DE10313054 2003-03-24

Publications (3)

Publication Number Publication Date
EP1462658A2 EP1462658A2 (fr) 2004-09-29
EP1462658A3 EP1462658A3 (fr) 2005-12-14
EP1462658B1 true EP1462658B1 (fr) 2009-08-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP04400016A Expired - Lifetime EP1462658B1 (fr) 2003-03-24 2004-03-22 Ventilateur radial

Country Status (5)

Country Link
US (1) US7179050B2 (fr)
EP (1) EP1462658B1 (fr)
AT (1) ATE438804T1 (fr)
DE (2) DE10313054B4 (fr)
ES (1) ES2331308T3 (fr)

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ATE438804T1 (de) 2009-08-15
EP1462658A2 (fr) 2004-09-29
US7179050B2 (en) 2007-02-20
DE10313054A8 (de) 2005-02-17
US20040219013A1 (en) 2004-11-04
ES2331308T3 (es) 2009-12-29
DE10313054B4 (de) 2012-10-04
EP1462658A3 (fr) 2005-12-14
DE502004009845D1 (de) 2009-09-17
DE10313054A1 (de) 2004-10-14

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