EP3571416A1 - Gedecktes radialgebläserad mit einer periodisch und asymmetrisch geformten scheibe - Google Patents
Gedecktes radialgebläserad mit einer periodisch und asymmetrisch geformten scheibeInfo
- Publication number
- EP3571416A1 EP3571416A1 EP18762797.1A EP18762797A EP3571416A1 EP 3571416 A1 EP3571416 A1 EP 3571416A1 EP 18762797 A EP18762797 A EP 18762797A EP 3571416 A1 EP3571416 A1 EP 3571416A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fan wheel
- radial
- blade
- impeller
- blades
- 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
Links
- 238000010586 diagram Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- 230000008092 positive effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or 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
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
-
- 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
-
- 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
-
- 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
- F05D2250/00—Geometry
- F05D2250/70—Shape
Definitions
- the invention relates to a radial impeller with a plurality of impeller blades arranged in a blade ring and at least one disc axially overlapping the impeller blades at least in sections.
- Radial blower wheels are known from the prior art in various designs and are used in a variety of blowers with different uses. It is also known that flow separation should be avoided as much as possible, since this reduces the efficiency reduce the speed of the fans or fans and lead to increased noise. In operation, the suction side of the impeller blades typically tends to flow separation by boundary layer overload while the flow is against the pressure side of the impeller blades.
- the invention is therefore based on the object to provide an impeller, which leads to increased efficiency and improved noise behavior in radial blowers.
- a radial fan wheel with a large number of fan blades arranged in a blade ring and at least one disc axially overlapping at least sections of the fan wheel blades wherein two adjacent fan wheel blades each form a blade channel whose flow cross-section is bounded axially by the disk.
- the axial width of the blade channel increases, at least along an outer circumference of the radial fan wheel, starting from a suction side of an impeller blade defining the blade channel in the direction of a pressure side of the adjacent impeller blade which delimits the blade channel to a maximum.
- the maximum on is a radial section of the impeller, which is between 55-95%, more preferably between 65-80% of the distance between the suction side of the blade channel limiting impeller blade and the pressure side of the adjacent, the blade channel limiting fan blade, so that the disc seen in the circumferential direction between two adjacent impeller blades has an asymmetrical shape.
- the inventive asymmetrical design of the disc of the radial impeller leads to a narrowing of the blade channel in the region of the suction side of the impeller blade and to an enlargement of the blade channel or its flow cross-sectional area in the pressure side of the impeller blade. As a result, the flow is stabilized in the region of the suction side and prevents or minimizes flow separation.
- the enlargement of the flow cross section takes place in particular without the course of the flow cross section to change abruptly and thus advantageously by a continuous course of the disc in the circumferential direction.
- the disc is formed identical in shape between each adjacent impeller blades, so that the flow channels extending between the fan impeller vanes are also identical in shape.
- an embodiment of the radial impeller is favorable, in which the impeller blades have a constant axial width, in particular at the outer radius of the radial impeller.
- the entire impeller blades of the blade ring are formed positively in an advantageous solution.
- the radial impeller according to the invention can also be defined by the formula, wherein the axial width of the respective blade channel along the Outer circumference of the radial impeller through the formulas
- BS corresponds to an axial width of the blade channel on the fan blade
- BE to the extension of the axial width of the blade channel to the maximum
- P a position of the maximum of the axial width of the blade channel starting from the suction side of the fan blade limiting the blade channel
- X a circumferential direction of a developed section along the Disc contour, ie a course along the outer contour of the radial impeller.
- the axial width of the respective blade channel increases to the maximum at the position P and then drops again.
- the formulas express the course of the axial width of the blade channel in the circumferential direction between two adjacent impeller blades.
- the value of the axial width corresponds to BS at the adjacent fan wheel gauge.
- the axial width of the blade channel increases by the extension BE with the off-center maximum of the axial width B.
- an advantageous embodiment provides that the disc is formed by the suction-side cover plate.
- the invention is not limited thereto, so that the disc can also be realized by the bottom plate, which usually also forms at least parts of the hub of the radial impeller.
- the increase in the axial width of the flow cross-section of the flow channel through both the bottom and the cover disc is formed with a corresponding asymmetrical contour on both sides.
- the asymmetrical disc is designed as a suction-side cover disk and the bottom disk extends parallel to an axial plane extending perpendicularly with respect to an axis of rotation of the radial fan wheel.
- the impeller blades preferably extend curved in the circumferential direction and terminate flush with the outer edge of the bottom disk and / or cover disk.
- the bottom disk completely covers the axial end faces of the fan wheel blades and that the cover disk partially covers the radially inward direction on the opposite axial end sides of the fan wheel blades, starting from the outside radius of the radial fan wheel.
- the axial end faces of the fan wheel blades are thus free on the suction side.
- the cover plate forms the suction opening extending around the rotation axis and the asymmetrical shape of the cover plate merges into a symmetrical shape in a direction pointing radially inward toward the suction opening.
- the suction opening itself or a section which is already radially adjacent to the suction opening is or are then annular.
- FIGS. 1 shows an embodiment of a radial impeller in a perspective view
- Fig. 2 shows the embodiment of the radial impeller of Fig. 1 in a side view
- FIG. 3 shows a diagram of the profile of the axial width of a blade channel along the circumferential direction of the radial fan wheel
- Fig. 4 is a diagram for comparing the efficiency and the
- Figures 1 and 2 show an embodiment of a Radialgebläserads 1 with a plurality of arranged in a blade ring backward curved fan blades 4, the lower axial end faces of which are parallel to the perpendicular to the axis of rotation of the Radialgebläserads 1 extending axial plane extending bottom plate 3 completely covered.
- the impeller blades 4 are partially covered with the suction side cover plate 2, wherein the impeller blades 4 are exposed in the region of the suction port 7 of the radial impeller 1 and extend with an arcuate radial end edge in the direction of the bottom disk 3.
- the suction port 7 is formed by the circular peripheral edge 9.
- each adjacent fan wheel blades 4 each form a blade channel 5 whose flow cross sections are respectively determined and limited by the fan wheel blades 4, the flat bottom disk 3 and the cover disk 2.
- all impeller blades 4 are identical and have a constant axial width. All too Flow channels 5 have the identical shape, as well as the cover plate 2 is formed identical in shape between each adjacent impeller blades 4.
- the axial width B of the respective blade channel 5 is not constant over the extent in the circumferential direction of the radial impeller 1, but is adjusted via the shape of the cover plate, so that it starts from the suction side S of the impeller 4 in the direction of the pressure side D of the adjacent impeller 4 of an axial width of the fan wheel bucket BS is increased to the maximum M and then back to the size of the axial width BS of the adjacent fan wheel bucket
- the course of the cover plate 2 is continuous.
- the maximum is off-center and on a radial section of the Radialgebläserads 1, in the embodiment shown at 75% of the distance between the suction side S of the impeller blade 4 and the pressure side D of the adjacent fan blade 4, measured at the outer radius of the radial impeller 1, so that the cover plate 2 seen in the circumferential direction between two adjacent impeller blades 4 has an asymmetrical shape.
- the asymmetrical shape is determined in particular at the outer radius of the radial impeller 1, but also runs over a certain length also radially inwards, so that a three-dimensional Axialbreitenveriererung in the radial outer region of the pressure side D of the individual impeller blades 4 is present.
- the asymmetrical shape of the cover plate 2 is continuous in the radially inwardly toward the suction port 7 facing direction in a symmetrical shape, wherein the adjoining the intake collar 8 is already formed as a ring.
- FIG. 3 shows a diagram of the course of the axial width B of the blade channel
- the center Z of the blade channel 5 is shown between two adjacent impeller blades 4 by the dot-dash line, left of the center Z, the suction side S and right of the center Z is the pressure side of the impeller blades 4.
- the mean axial width MB is entered.
- the maximum M of the axial width B is entered at 75% of the distance between the suction side S of the impeller blade 4 and the pressure side D of the adjacent impeller blade 4 as a dotted line.
- FIG. 4 shows a diagram with characteristic curves measured with an identical experimental setup for the pressure curve psf [Pa] and the efficiency nse [%] at different volume flows qv [m 3 / h] of the radial fan wheel 1 according to FIG. 1 and of the identical radial fan wheel 100 only shown with flat cover plate 200 according to Figure 5, wherein the solid curves characterize the Radialgebläserad 1 according to Figure 1 with the cover plate 2 and the finely dotted curves respectively the Radialgebläserad 100 according to Figure 5.
- the advantageous effect with increased peak efficiency starts already at a volume flow from about 150 m 3 / h upwards.
- the superior pressure curve already starts at approx. 225 m 3 / h.
- the reduction of noise is in the range from 225 m 3 / h at least 5%.
- all the features disclosed in the present description or the claims can be integrated, or the features described as an alternative can replace the features disclosed with reference to FIG. 1, without a separate exemplary embodiment being shown for this purpose.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017120537.3A DE102017120537A1 (de) | 2017-09-06 | 2017-09-06 | Radialgebläserad mit asymmetrischer Scheibe |
PCT/EP2018/072693 WO2019048241A1 (de) | 2017-09-06 | 2018-08-22 | Gedecktes radialgebläserad mit einer periodisch und asymmetrisch geformten scheibe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3571416A1 true EP3571416A1 (de) | 2019-11-27 |
EP3571416B1 EP3571416B1 (de) | 2023-10-04 |
Family
ID=63222494
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18762797.1A Active EP3571416B1 (de) | 2017-09-06 | 2018-08-22 | Gedecktes radialgebläserad mit einer periodisch und asymmetrisch geformten scheibe |
Country Status (5)
Country | Link |
---|---|
US (1) | US11143197B2 (de) |
EP (1) | EP3571416B1 (de) |
CN (1) | CN207777266U (de) |
DE (1) | DE102017120537A1 (de) |
WO (1) | WO2019048241A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD949315S1 (en) * | 2016-06-24 | 2022-04-19 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Vane damper with trailing edge |
DE102020114389A1 (de) * | 2020-05-28 | 2021-12-02 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Gebläserad mit ener nahtlosen Anbindung der Laufradschaufeln an einen Scheibenkörper |
DE102022113706A1 (de) * | 2022-05-31 | 2023-11-30 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Kühlrad zur aktiven Kühlung eines Stators eines Elektromotors |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008223741A (ja) | 2007-03-16 | 2008-09-25 | Daikin Ind Ltd | 遠心送風機 |
JP5634782B2 (ja) * | 2009-08-11 | 2014-12-03 | 山洋電気株式会社 | 遠心ファン |
JP4902718B2 (ja) * | 2009-10-07 | 2012-03-21 | 三菱電機株式会社 | 遠心送風機および電気掃除機 |
DE202010018509U1 (de) * | 2010-02-26 | 2017-03-15 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Radial- oder Diagonal-Ventilatorrad |
JP5783305B2 (ja) | 2013-09-18 | 2015-09-24 | ダイキン工業株式会社 | ギヤ流体装置 |
KR101720491B1 (ko) * | 2015-01-22 | 2017-03-28 | 엘지전자 주식회사 | 원심팬 |
KR102257480B1 (ko) * | 2015-03-24 | 2021-05-31 | 삼성전자주식회사 | 원심팬 |
-
2017
- 2017-09-06 DE DE102017120537.3A patent/DE102017120537A1/de not_active Withdrawn
-
2018
- 2018-01-05 CN CN201820017251.4U patent/CN207777266U/zh active Active
- 2018-08-22 US US16/607,321 patent/US11143197B2/en active Active
- 2018-08-22 WO PCT/EP2018/072693 patent/WO2019048241A1/de unknown
- 2018-08-22 EP EP18762797.1A patent/EP3571416B1/de active Active
Also Published As
Publication number | Publication date |
---|---|
EP3571416B1 (de) | 2023-10-04 |
DE102017120537A1 (de) | 2019-03-07 |
US20200080565A1 (en) | 2020-03-12 |
CN207777266U (zh) | 2018-08-28 |
WO2019048241A1 (de) | 2019-03-14 |
US11143197B2 (en) | 2021-10-12 |
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