EP3821132A1 - Diagonal fan having an optimised diagonal impeller - Google Patents
Diagonal fan having an optimised diagonal impellerInfo
- Publication number
- EP3821132A1 EP3821132A1 EP19798270.5A EP19798270A EP3821132A1 EP 3821132 A1 EP3821132 A1 EP 3821132A1 EP 19798270 A EP19798270 A EP 19798270A EP 3821132 A1 EP3821132 A1 EP 3821132A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- diagonal
- impeller
- hub
- fan according
- air inlet
- 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.)
- Pending
Links
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
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/06—Helico-centrifugal 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/384—Blades characterised by form
- F04D29/386—Skewed blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/002—Axial flow fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
-
- 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
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
- F04D29/326—Rotors specially for elastic fluids for axial flow pumps for axial flow fans comprising a rotating shroud
-
- 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
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
- F04D29/329—Details of the hub
-
- 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
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially 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
- F04D29/18—Rotors
- F04D29/181—Axial flow rotors
- F04D29/183—Semi axial flow rotors
Definitions
- the invention relates to a diagonal fan with an optimized diagonal impeller to increase the efficiency.
- Diagonal fans and their use are generally known from the prior art, for example from DE 10 2014 210 373 A1.
- Diagonal fans are used in applications with high air performance requirements with higher back pressure and a small installation space, for example in cooling technology or extractor hoods. Due to the large diameter of the axially central motor in diagonal fans in relation to the installation space and the radial expansion the hub, the blow-out area at the blow-out opening is relatively small, which leads to high outlet losses in the flow due to high dynamic pressure at the outlet of the diagonal fan.
- the invention solves the problem of a diagonal fan with an axial
- a diagonal fan with an electric motor and a diagonal impeller that can be driven via the electric motor about an axis of rotation the diagonal impeller determining an air inlet and an air outlet and having a hub and impeller blades that extend in the circumferential direction and extend from the hub to the outside of the dial , which are surrounded radially on the outside by a slinger. It is provided that a flow angle formed by the centrifugal ring with respect to the axis of rotation from the air inlet to the air outlet increases and a flow angle formed by the hub with respect to the axis of rotation from the air inlet to the air outlet decreases.
- the area of the impeller blades represents the section through which the flow can flow.
- the quality of the flow along the radially outer and radially inner wall sections formed by the thrower ring and the hub is an important aspect with regard to the pressure generation, the throwing distance and the efficiency of the diagonal fan .
- the geometry on the centrifugal wheel and the hub is correspondingly increased by an increase in the flow angle on the centrifugal ring and a decrease in the flow angle on the hub adjusted to get improved values in this regard.
- the rotation axis serves as a reference point, the flow angle increasing in the direction of the rotation axis starting from the value 0 ° (0 ° corresponds to an axial plane parallel to the rotation axis).
- the diagonal fan provides particularly advantageous angular ranges for the flow angles at the radially outer region of the diagonal impeller, the flow angle aD1 formed by the centrifugal ring with respect to the axis of rotation at the air inlet in an angular range of 0 ° ⁇ aD1 ⁇ 12 ° and that through the Centrifugal ring with respect to the axis of rotation formed flow angle aD2 at the air outlet is set in an angular range of 10 ° ⁇ aD2 ⁇ 30 °, preferably 15 ° ⁇ aD2 ⁇ 20 °.
- the angular range is disclosed that the difference between the flow angles aD2-aD1 is defined in a range of values, that is, 2 ° ⁇ aD2-aD1 ⁇ 20 °.
- the flow angle aN formed by the hub with respect to the axis of rotation from the air inlet to the air outlet is in an angular range of 20 ° ⁇ aDN1 ⁇ 55 ° at the air inlet and through the flow angle aN2 formed at the air outlet relative to the axis of rotation is defined in an angular range of 0 ° ⁇ aDN2 ⁇ 15 °.
- an embodiment of the diagonal fan is favorable in which the flow angles aD and aN change in a continuous course of the slinger and the hub, i.e. the profiles of the slinger and the hub are continuous in radial section.
- the diagonal fan also provides that the mean stagger angle of the impeller blades is above their respective axial course in a radial outer section of the respective impeller blade adjoining the thrower ring is reduced by an angular range of 5 ° to 15 °. The direction of the angle reduction is outward.
- the stagger angle of the impeller blades is known in the art and determines the angle of attack of the impeller blades with respect to an axial plane perpendicular to the axis of rotation.
- the radial outer section is preferably in a range between 75% -100% of the radial extension of the respective impeller blade, 0% of the radial extension being determined on the hub and 100% of the radial extension on the slinger.
- the impeller blades have a blade edge pointing towards the air inlet and a blade edge pointing towards the air outlet.
- at least the trailing edge of the blade has an S-shaped profile when viewed in an axial plan view.
- the turning point arcs in the S-shaped course i.e. the point at which the arc direction changes is in a range between 50% -90%, in particular 70% -90% of the radial extent of the respective impeller blade.
- Diameter Ds wherein a ratio of the suction diameter Ds to the impeller diameter Da is fixed that applies
- an embodiment of the diagonal fan is favorable in which the impeller blades have an average axial blade extension La which is in relation to a maximum impeller diameter Da of the diagonal impeller, that is 0.05 ⁇ La / Da ⁇ 0.25, preferably 0 , 09 ⁇ La / Da ⁇ 0.18.
- the electric motor forms the flow contour of the hub in the central area.
- the hub has an axis-central recess, through which the electric motor extends in the axial direction and also forms an inflow surface facing the air inlet. Axis center always defines the arrangement on the axis of rotation.
- the diagonal fan is further characterized in one exemplary embodiment in that the hub forms a motor receptacle and a plurality of openings are provided on a side facing the air outlet on the motor receptacle, which provides an axial flow connection from the side of the air outlet to the side of the air inlet. Part of the air sucked in by the diagonal impeller at the air inlet and blown out at the air outlet can thus flow back through the openings on the hub and improve the application of the flow to the hub. The backflow also serves as a cooling flow along the electric motor.
- the diagonal fan in one embodiment, viewed in the axial flow direction, subsequently comprises a diagonal impeller which evens out an air flow generated by the diagonal impeller.
- the device can have a plurality of guide vanes distributed in the circumferential direction.
- the follow-up device has a protective grille which extends over a blow-out section of the diagonal fan.
- Figure 1 is a perspective view of an embodiment of a diagonal fan according to the invention.
- FIG. 2 is a radial sectional view of the diagonal fan from FIG. 1; 3 shows the radial sectional view of the diagonal fan from FIG. 2 with further explanations;
- FIG. 4 shows an axial rear view of the diagonal fan from FIG. 1;
- FIG. 5 shows an axial top view of the diagonal fan from FIG. 1.
- Figures 1-5 show an embodiment of the diagonal fan 1 in several views.
- the diagonal fan 1 comprises the electric motor 10, which is designed as an external rotor motor, and the diagonal impeller 12 with its impeller blades 121 which extend radially outward from the hub 35, which extends around the axis of rotation RA, and which are distributed in the circumferential direction and which are enclosed radially on the outside by the thrower ring 122 .
- the diagonal impeller 12 has the flow channel through which the diagonal impeller 12 promotes air from the air inlet 30 to the air outlet 31.
- the radially inner wall of the flow channel is determined by the outer surface of the hub 35, the radially outer wall by the inner wall of the centrifugal ring 122.
- the flow angle aD1 formed at the air inlet 30 by the centrifugal ring 122 with respect to the rotation axis RA is set at 10 ° in the embodiment shown
- the flow angle aD2 formed at the air outlet by the centrifugal ring 122 with respect to the axis of rotation RA is fixed at 18 °, so that the angle difference at 8 °.
- the flow angle aN1 formed at the air inlet 30 by the jacket surface of the hub 35 with respect to the axis of rotation RA is 40 °
- the flow angle at the air outlet 31 formed by the jacket surface of the hub 35 with respect to the axis of rotation RA is 2 °, so that the angle difference has a value of 38 °.
- Both the slinger ring 122 and the outer surface of the hub 35 have a continuous course in the region forming the flow channel.
- the hub 35 has an axially central recess 79 with a Motoraufnah me 29.
- the electric motor 10 runs in the axial direction through the recess 79 and forms the inflow surface 15 on the suction side.
- a plurality of openings 85 distributed in the circumferential direction are provided in the hub 35, through which part of the flow along of the electric motor 10 is returned and then conveyed again through the flow channel.
- a plurality of openings 73 distributed in the circumferential direction are also provided in the axially foremost edge of the lateral surface of the hub 35, which are in flow connection with the area of the air outlet 31.
- the centrifugal ring 122 of the diagonal fan 1 at the air inlet 30 forms two axially extending, coaxial annular lips 130, 131, which converge on the exhaust side to form a type of cover plate.
- the radial outer edge section 123 of the respective impeller blades 121 is specially designed in the range of 75-100% of the radial extent S.
- the staggering angle of the impeller blades 121 is reduced over their respective axial course on average by a value of approximately 10 ° with respect to the area lying radially further inwards.
- the blade leading edges 33 have a continuous arch shape without changing direction.
- the blade trailing edges 32 run in an S-shape, where at the inflection point W between the two opposing arc shapes is 75% of the radial extent S, as shown in FIG. 4.
- the diagonal fan 1 can also have a follow-up device, which, seen in the axial flow direction, adjoins the diagonal impeller 12 and which uniformizes the air flow generated by the diagonal impeller 12.
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 |
---|---|---|---|
DE102018128821.2A DE102018128821A1 (en) | 2018-11-16 | 2018-11-16 | Diagonal fan with optimized diagonal impeller |
PCT/EP2019/080093 WO2020099167A1 (en) | 2018-11-16 | 2019-11-04 | Diagonal fan having an optimised diagonal impeller |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3821132A1 true EP3821132A1 (en) | 2021-05-19 |
Family
ID=68468726
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19798270.5A Pending EP3821132A1 (en) | 2018-11-16 | 2019-11-04 | Diagonal fan having an optimised diagonal impeller |
Country Status (5)
Country | Link |
---|---|
US (1) | US11542955B2 (en) |
EP (1) | EP3821132A1 (en) |
CN (2) | CN209781249U (en) |
DE (1) | DE102018128821A1 (en) |
WO (1) | WO2020099167A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018128820A1 (en) * | 2018-11-16 | 2020-05-20 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Diagonal fan with optimized housing |
DE102018128821A1 (en) | 2018-11-16 | 2020-05-20 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Diagonal fan with optimized diagonal impeller |
AT17059U1 (en) * | 2020-02-11 | 2021-04-15 | Thomas Euler Rolle | Axial fan |
CN113685371A (en) * | 2021-09-26 | 2021-11-23 | 中车株洲电机有限公司 | Motor fan impeller |
DE102022131248A1 (en) | 2022-11-25 | 2024-05-29 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Diagonal impeller with varying hub area |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4127134B4 (en) * | 1991-08-15 | 2004-07-08 | Papst Licensing Gmbh & Co. Kg | diagonal fan |
JP4530249B2 (en) | 2003-06-27 | 2010-08-25 | 大王製紙株式会社 | Pants-type disposable diapers |
JP4512352B2 (en) * | 2003-12-02 | 2010-07-28 | 株式会社日立製作所 | Pipe fan |
DE20319741U1 (en) * | 2003-12-18 | 2004-10-28 | Ruck Ventilatoren Gmbh | Radial or diagonal fan for ventilation has shaped blades, twisted in three dimensions |
DE20319749U1 (en) * | 2003-12-18 | 2004-11-04 | Ruck Ventilatoren Gmbh | tubefan |
WO2011038884A1 (en) * | 2009-10-03 | 2011-04-07 | Ebm-Papst St. Georgen Gmbh & Co. Kg | Cross-flow fan |
DE102014212561A1 (en) * | 2013-08-21 | 2015-02-26 | Ford Global Technologies, Llc | Quiet fan for a motor vehicle |
DE102014210373A1 (en) | 2014-06-02 | 2015-12-03 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Radial or diagonal fan |
DE202015100654U1 (en) * | 2015-02-11 | 2015-04-02 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Fan wheel and fan |
DE102018128821A1 (en) * | 2018-11-16 | 2020-05-20 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Diagonal fan with optimized diagonal impeller |
-
2018
- 2018-11-16 DE DE102018128821.2A patent/DE102018128821A1/en active Pending
-
2019
- 2019-01-31 CN CN201920172751.XU patent/CN209781249U/en active Active
- 2019-11-04 EP EP19798270.5A patent/EP3821132A1/en active Pending
- 2019-11-04 US US17/274,767 patent/US11542955B2/en active Active
- 2019-11-04 WO PCT/EP2019/080093 patent/WO2020099167A1/en unknown
- 2019-11-04 CN CN201980067351.5A patent/CN112840128B/en active Active
Also Published As
Publication number | Publication date |
---|---|
WO2020099167A1 (en) | 2020-05-22 |
DE102018128821A1 (en) | 2020-05-20 |
US20220049715A1 (en) | 2022-02-17 |
US11542955B2 (en) | 2023-01-03 |
CN112840128B (en) | 2024-01-09 |
CN112840128A (en) | 2021-05-25 |
CN209781249U (en) | 2019-12-13 |
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Legal Events
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Effective date: 20230703 |