EP3880966A1 - Diagonal fan having swirl reduction at the diagonal impeller - Google Patents
Diagonal fan having swirl reduction at the diagonal impellerInfo
- Publication number
- EP3880966A1 EP3880966A1 EP19786299.8A EP19786299A EP3880966A1 EP 3880966 A1 EP3880966 A1 EP 3880966A1 EP 19786299 A EP19786299 A EP 19786299A EP 3880966 A1 EP3880966 A1 EP 3880966A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- diagonal
- diagonal fan
- flow
- impeller
- housing
- 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
- 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
- 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
- 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
- F04D29/08—Sealings
- F04D29/16—Sealings between pressure and suction sides
- F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
- F04D29/164—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of an axial flow wheel
-
- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
Definitions
- the invention relates to a diagonal fan with a swirl reduction on the diagonal impeller.
- 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 motor diameter of diagonal fans in relation to the installation space Knife of the axially central motor and the radial expansion of 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.
- Axial fans are usually used to achieve long throwing distances. However, diagonal fans are cheap for the compact design.
- the invention solves the problem of providing a diagonal fan which is improved in terms of efficiency and throwing distance and can therefore be used in a wider range of applications. This object is achieved by the combination of features according to claim 1.
- a diagonal fan with an electric motor, a housing and a diagonal impeller which is accommodated within the housing and can be driven by the electric motor is proposed.
- the diagonal flow generated by the diagonal impeller during operation is deflected by the housing in an axial flow direction.
- the diagonal impeller has impeller blades distributed in the circumferential direction and a thrower ring which surrounds the impeller blades in the circumferential direction.
- the diagonal fan further comprises an inlet nozzle on the suction side, through which a main flow of the diagonal fan is sucked, the inlet nozzle, seen in radial section, extending overlapping at least in sections to the centrifuge ring and thereby forming a nozzle gap with the centrifugal ring.
- a bypass duct is also provided on the housing, which forms a flow connection from a pressure-side surrounding area of the diagonal fan to an inflow side of the nozzle gap, so that during operation of the diagonal fan, a swirl-free secondary flow is conducted to the inflow side of the nozzle gap via the bypass duct.
- the invention solves the problem by the inflow of the swirl-free secondary Flow in the nozzle gap via the bypass channel.
- a gap flow is generated in the nozzle gap, which leads to an improved application of the flow to the centrifugal ring.
- this gap flow is fed in particular by the highly turbulent and swirling flow at the outlet (pressure side) of the diagonal impeller.
- the turbulent gap flow causes an increased noise when interacting with the leading edge of the fan blades.
- the inflow vector to the diagonal impeller changes significantly between the gap flow and the main flow within the shear layer, which leads to an incorrect flow against the fan impeller blades, that is to say an inflow at a non-optimal angle.
- the respective angle difference of the inflow vector is dependent on the operating point and cannot be geometrically compensated for on the fan wheel blades.
- the bypass duct runs parallel to an outer casing wall of the housing and determines an inner wall of the housing, which deflects the diagonal flow generated by the diagonal impeller in the axial flow direction.
- the bypass channel is thus installed as an integral part of the housing to save space.
- An embodiment of the diagonal fan is advantageous in terms of flow technology, in which the bypass duct has an axial flow cross-sectional area AB that has a ratio to an axial flow cross-sectional area AS of the nozzle gap, that is 0.5 ⁇ AB / AS ⁇ 5.
- the ratio is preferably chosen so that: 0.75 ⁇ AB / AS ⁇ 2.5. In the areas, the influence of the swirl-free secondary flow via the bypass channel is particularly effective.
- bypass duct surrounds the diagonal impeller radially on the outside and is therefore arranged at an axial height with respect to the diagonal impeller.
- a completely enclosing channel e.g. two or four channels can also be arranged in the corners in order to make better use of the installation space.
- the bypass duct is also preferably of an axial length such that it extends over the diagonal impeller in the axial direction on both sides, i.e. seen in radial section on both sides beyond axial edge planes of the diagonal impeller. It is particularly advantageous if the inlet of the bypass duct on the pressure side is connected to the surroundings of the diagonal fan separately from the blow-out area of the main flow.
- bypass duct In order to reduce the number of parts and simplify assembly, the preferred procedure is for the bypass duct to be formed in one piece on the housing.
- the centrifugal ring and the inlet nozzle run parallel at least in sections in the region of the nozzle gap.
- the centrifugal ring runs coaxially radially outside the inlet nozzle, so that the nozzle gap is formed radially on the outside of the inlet nozzle.
- the centrifugal ring in the nozzle section extends parallel to an axis of rotation of the diagonal impeller extending in the axial direction of the diagonal fan, i.e. in the overlap section, the thrower ring and the inlet nozzle run parallel to the axially sucked-in flow direction.
- the centrifugal ring has a flow cross section which widens radially outward in the axial flow direction and is directed toward an inner wall of the housing.
- an advantageous embodiment provides that the after-guiding device is formed in one piece with the housing. The number of parts and assembly steps can thus be reduced. A seal between the components can also be dispensed with.
- the follow-up device has a protective grille extending over a blow-out section of the diagonal fan.
- a variant of the diagonal fan in which the secondary guide device, the housing and the protective grille are formed in one piece is also favorable.
- At least two axial screwing levels are each formed on the housing with fastening means for fastening the diagonal fan.
- the diagonal fan is attached, for example, to a heat exchanger.
- the secondary guide has a motor mount for the electric motor in the hub area.
- the attachment of the electric motor can thus be taken over by the guide device.
- the diagonal fan 1 comprises a housing 11, in which the electric motor 10 is embodied as an external rotor motor and is connected to the diagonal impeller 12 in order to rotate the latter about the axis of rotation RA during operation.
- the diagonal impeller 12 is fastened to the electric motor 10 with its hub 119.
- a plurality of impeller blades 121 which are distributed in the circumferential direction and extend radially outward from the hub 119, the radially outer end of which is closed by the slinger ring 122.
- the fan impeller blades 121 have a blade leading edge 117 and a blade trailing edge 118, each of which is inclined to the inlet side of the diagonal fan 1 with respect to a vertical perpendicular to the axis of rotation from radially inward to radially outward, the angle at the trailing edge 118 of the blade being greater than at the leading edge of the blade 117.
- the inlet nozzle 6 which is formed in one piece on the housing 11, is provided, through which the diagonal impeller 12 draws in the main flow HS during operation.
- the inlet nozzle 6 has a flow cross-section which is reduced in the axial direction and which is the smallest at the axial free end section 7.
- This free end section 7 runs parallel to the axis of rotation RA and overlaps in the overlap region 30 with the front section 123 of the slinger ring 122, which also extends parallel to the axis of rotation RA.
- the nozzle gap 19 is formed.
- Vorderab section 123 directly adjoins the sling ring 122 which extends obliquely outwards and angled with respect to the axis of rotation, the rear section 124 which defines the radially outward widening in the axial flow direction, to an inner wall 111 of the housing 11 directed flow cross section .
- the bypass duct 22 is formed in one piece on the housing 11, which extends from the blow-out section 27 of the diagonal fan 1 in the axial direction to the inlet nozzle 6 and a flow connection from the pressure-side surrounding area U of the diagonal fan 1 via the axial inlet opening 21 to the inflow side of the nozzle gap 19 forms.
- the oppositely running, swirl-free secondary flow NS in the bypass channel 22 is generated and fed to the main flow HS via the nozzle gap 19.
- the bypass channel 22 extends in the axial direction of the entire diagonal impeller 12 and is arranged radially on the outside in one piece on the housing 11.
- the ratio is preferably set in a range of 0.5-5.0.
- the diagonal fan 1 comprises a follow-up device 90 on the blow-out section 27, which then smoothes out the diagonal flow blown out of the diagonal impeller 12 and then deflected back into the axial direction by the inner wall 11.
- the follow-up device 90 comprises a plurality of guide vanes distributed in the circumferential direction and a protective grille which then extends over the blow-out section 27 of the diagonal fan 1.
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 |
---|---|---|---|
DE102018128813.1A DE102018128813A1 (en) | 2018-11-16 | 2018-11-16 | Diagonal fan with swirl reduction on the diagonal impeller |
PCT/EP2019/077103 WO2020099027A1 (en) | 2018-11-16 | 2019-10-07 | Diagonal fan having swirl reduction at the diagonal impeller |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3880966A1 true EP3880966A1 (en) | 2021-09-22 |
Family
ID=68208290
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19786299.8A Pending EP3880966A1 (en) | 2018-11-16 | 2019-10-07 | Diagonal fan having swirl reduction at the diagonal impeller |
Country Status (5)
Country | Link |
---|---|
US (1) | US11692553B2 (en) |
EP (1) | EP3880966A1 (en) |
CN (1) | CN209704875U (en) |
DE (1) | DE102018128813A1 (en) |
WO (1) | WO2020099027A1 (en) |
Families Citing this family (2)
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 |
DE102022131248A1 (en) | 2022-11-25 | 2024-05-29 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Diagonal impeller with varying hub area |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8334120D0 (en) * | 1983-12-21 | 1984-02-01 | Gerry U K | Diffusers |
KR100548036B1 (en) * | 1998-12-31 | 2006-05-09 | 한라공조주식회사 | Axial fan shroud assembly with guide vane for axial fan and its guide vane |
DE102006049076B4 (en) * | 2006-10-13 | 2019-09-26 | Mahle International Gmbh | Axial fan arranged to promote cooling air for a cooling device of a motor vehicle |
WO2008074307A1 (en) * | 2006-12-18 | 2008-06-26 | Temic Automotive Electric Motors Gmbh | Axial fan for a vehicle radiator |
CN101652573B (en) * | 2007-04-05 | 2012-02-01 | 博格华纳公司 | ring fan and shroud air guide system |
DE102010032168A1 (en) | 2010-07-23 | 2012-01-26 | Ruck Ventilatoren Gmbh | Diagonal fan |
DE102011015784A1 (en) * | 2010-08-12 | 2012-02-16 | Ziehl-Abegg Ag | fan |
DE102014210373A1 (en) | 2014-06-02 | 2015-12-03 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Radial or diagonal fan |
DE102015207800A1 (en) * | 2015-04-28 | 2016-11-03 | Ziehl-Abegg Se | Diagonal or centrifugal fan, guide for such a fan and system with such a fan or with several such fans |
KR101707618B1 (en) | 2015-05-07 | 2017-02-21 | 삼성전자주식회사 | Air conditioner and method for controlling the same |
US10473116B2 (en) * | 2016-02-08 | 2019-11-12 | Robert Bosch Gmbh | Engine cooling fan casing shroud with unobstructed outlet |
DE102016122533A1 (en) * | 2016-11-22 | 2018-05-24 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Diagonal fan |
DE202017102950U1 (en) | 2017-05-16 | 2017-06-21 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Blower arrangement with flow dividing nozzle |
-
2018
- 2018-11-16 DE DE102018128813.1A patent/DE102018128813A1/en active Pending
-
2019
- 2019-02-12 CN CN201920191641.8U patent/CN209704875U/en active Active
- 2019-10-07 WO PCT/EP2019/077103 patent/WO2020099027A1/en unknown
- 2019-10-07 US US17/281,688 patent/US11692553B2/en active Active
- 2019-10-07 EP EP19786299.8A patent/EP3880966A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
US20220025892A1 (en) | 2022-01-27 |
CN209704875U (en) | 2019-11-29 |
DE102018128813A1 (en) | 2020-05-20 |
US11692553B2 (en) | 2023-07-04 |
WO2020099027A1 (en) | 2020-05-22 |
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Effective date: 20210215 |
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Effective date: 20230119 |