EP4063663A1 - Diffuseur d'écoulement sans aube - Google Patents

Diffuseur d'écoulement sans aube Download PDF

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Publication number
EP4063663A1
EP4063663A1 EP22161823.4A EP22161823A EP4063663A1 EP 4063663 A1 EP4063663 A1 EP 4063663A1 EP 22161823 A EP22161823 A EP 22161823A EP 4063663 A1 EP4063663 A1 EP 4063663A1
Authority
EP
European Patent Office
Prior art keywords
axial
diffuser
fan
hub
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
Application number
EP22161823.4A
Other languages
German (de)
English (en)
Inventor
Saurabh Gupta
Tobias SIEGER
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 St Georgen GmbH and Co KG
Original Assignee
Ebm Papst St Georgen GmbH and Co KG
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 Ebm Papst St Georgen GmbH and Co KG filed Critical Ebm Papst St Georgen GmbH and Co KG
Publication of EP4063663A1 publication Critical patent/EP4063663A1/fr
Pending 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
    • 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
    • F04D19/00—Axial-flow pumps
    • F04D19/007—Axial-flow pumps multistage 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
    • 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
    • F04D29/545—Ducts
    • 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
    • F05D2250/50—Inlet or outlet
    • F05D2250/52—Outlet

Definitions

  • the invention relates to an axial fan with a housing that forms a flow channel and a fan wheel that is accommodated in the housing and can be rotated about an axis of rotation.
  • the invention is aimed at improving aerodynamic efficiency and thereby also reducing the power consumption in such axial fans.
  • the flow-related noise should be reduced.
  • an axial fan is proposed with a housing forming a flow channel and a fan wheel accommodated in the housing and rotatable about an axis of rotation, in which the fan wheel has a hub from which fan wheel blades extend radially outwards.
  • the fan wheel forms a hub diffuser on the hub, which axially adjoins an area of the hub in which the fan wheel blades of the fan wheel are formed, so that the hub diffuser is bladeless, i.e. free of fan wheel blades.
  • the hub diffuser can be used to delay the flow velocity at the downstream end and behind the impeller. This is done by gradually reducing the hub diameter and the associated increase in the free flow cross section in the flow channel.
  • the hub diffuser is unaffected by the impeller blades. This is achieved in that the impeller blades end axially in front of the hub diffuser, so that a hub diffuser wall surface facing the flow channel is formed without impeller blades and only the tapering cross-section of the hub diffuser wall surface acts on the downstream flow.
  • the dynamic exit losses, the power consumption and the generation of noise are reduced.
  • an axial section in the flow channel of the axial fan, in which the hub diffuser is formed is formed as a free space through which air can flow freely.
  • the hub diffuser wall surface is not only free of impeller blades, but that the hub diffuser wall surface is formed free of any components such as webs or other flow guide elements as well as the free space in the flow channel adjoining the hub diffuser wall surface radially. The flow can thus flow freely and unaffected through the flow channel in the axial section of the hub diffuser.
  • the housing has an outlet on the outflow side and a housing diffuser at the outlet, with the fan wheel being positioned within the housing in such a way that the hub diffuser of the fan wheel and the housing diffuser of the housing overlap in an axial plane.
  • the hub diffuser and the housing diffuser together have a positive effect on the flow at the outlet of the axial fan. It is also favorable if the housing diffuser has a rounded housing diffuser wall surface and the hub diffuser has a conical hub diffuser wall surface.
  • the hub diffuser and the housing diffuser increase a flow channel cross-sectional area of the flow channel at the outlet by a total of 25-30%.
  • a design in which the entire axial extent of the hub diffuser is greater than the entire axial extent of the housing diffuser also has a favorable effect in terms of flow technology in the case of the axial fan for solving the tasks.
  • an embodiment is also advantageous for the axial fan in which a radial indentation of the hub diffuser relative to the hub is less than a radial indentation of the housing diffuser relative to a housing inner wall surface axially adjoining the housing diffuser.
  • radial indentation is understood to mean the reduction in the extension in the radial direction perpendicular to the axis of rotation.
  • the fan wheel is therefore arranged axially in series with at least one second fan wheel.
  • the fan wheels together generate an axial flow through the flow channel, the fan wheel with the hub diffuser being positioned on the outflow side and the second fan wheel being positioned on the intake side.
  • a non-rotatable web arrangement with a plurality of radial webs is provided axially between the fan wheel and the second fan wheel, which extend radially through the flow channel and have a curved profile, which is designed to have an im Operation to convert generated swirl of the axial flow of the first fan wheel in static pressure.
  • the curved profiling can take place through a three-dimensional curvature of the radial webs, so that the radial webs form flow guide surfaces along the axial flow direction, which influence the axial flow aerodynamically.
  • the multi-stage axial fan comprises an annular part which forms part of the housing and comprises the web arrangement with the radial webs.
  • the ring part thus makes a contribution to the structural design and to the aerodynamics of the axial fan.
  • the ring part is preferably designed in one piece. In one embodiment, it has a ring element and an axially central motor mount which is coaxial with the ring element and to which at least one motor of the axial fan can be fastened.
  • the ring element forms part of the housing, the motor mount is another constructive part for integrating the motor or motors of the impellers.
  • the radial webs preferably extend from the ring element to the motor mount through the flow channel.
  • the fan wheel and the second fan wheel are preferably each arranged directly adjacent to the annular part.
  • a development of the axial fan is also characterized in that the fan wheel has impeller blades with a first axial extent and the second fan wheel with impeller blades with a second axial extent, the first axial extent being greater than the second axial extent.
  • This constructive solution also contributes to the solution of the tasks.
  • the radial webs with a curved profile, on which the static pressure is built up the load and the speed of the following impeller blades of the second fan wheel are reduced and the axial extension can be reduced. This in turn has a positive effect on providing the hub diffuser in the fan wheel, since the axially shorter impeller blades on the fan wheel create axial space for the hub diffuser.
  • the axial fan 1 comprises a three-part, nested housing 2, in which the first fan wheel 4, the fixed, non-rotatable web arrangement 6 and the second fan wheel 5 are accommodated, viewed axially in a row in the direction of flow S, and together the flow channel 3 parallel to the axis of rotation RA of the fan wheels 4, 5 determine.
  • the two fan wheels 4, 5 generate the axial flow AS through the flow channel 3, with the proportion of the axial flow AS generated by the first fan wheel 4 initially flowing against the web arrangement 6 and then being carried on by the second fan wheel 5.
  • the non-rotatable web arrangement 6 is formed by the ring part 10 and comprises a plurality of radial webs 7.
  • a wall insert 93 (see figure 2 ) to compensate for the rectangular or square outer contour provided in a flow channel 3 with a round cross section.
  • the ring part 10 is in figure 6 shown closer. It is designed in one piece with the ring element 11, which forms part of the housing 2, an axle-central motor mount 12 with an outer ring 12 and two hollow-cylindrical axial sockets 80, 81 for fastening the motors 44, 45 on the outside and the motor bearing on the inside (see Fig figure 1 ). Between the axial sockets 80, 81 and the outer ring 12, a plurality of recesses 22 through which flow can flow and stiffening struts 23 are alternately distributed in the circumferential direction. Thus, cooling air can also get into the area of the motors 44, 45 and flow through the recesses 22.
  • the radial webs 7 of the web arrangement 6 extend radially between the ring element 11 and the outer ring 76 of the motor mount 12.
  • the axial extent of the radial webs 7 in their radially outer edge section, in which they are connected to the ring element 11, is greater in terms of amount than the axial extent in the radially inner edge section, which is respectively attached to the outer ring 76 of the engine mount 12 is connected.
  • the outer ring 76 is coaxial with the ring element 11.
  • Each of the radial webs 7 has the same shape and each has the leading edge 8 and the trailing edge 9 . Viewed from a radial plane, the leading edge 8 is more curved than the trailing edge 9.
  • the radial webs 7 extend radially through the flow channel 3 and have a curved profile. In the embodiment shown, the radial webs 7 are curved both in the circumferential direction and in the axial direction. A three-dimensional curvature of the radial webs 7 results in at least two directions. This results in flow guide surfaces 77 on the radial webs 7 along the axial flow direction S, so that these are designed to convert a swirl of the axial flow of the first fan wheel 4 generated during operation into static pressure. The remaining twist is then removed by the second fan wheel 5 with a low build-up of static pressure. In the embodiment shown, the two fan wheels 4, 5 rotate in opposite directions during operation.
  • the first fan wheel 4 has the hub 24 from which the impeller blades 14 extend radially outwards.
  • the second fan wheel 5 has the hub 25 from which the impeller blades 15 extend radially outwards.
  • the hubs 24, 25 each run parallel to the motor mount 12 in the axial plane AE and thus form a radially inner wall surface of the flow channel 3 parallel to the axis of rotation RA.
  • An interruption is provided between the hubs 24, 25 and the outer ring 76 of the motor mount 12, so that air can flow into the area of the axial sockets.
  • the first fan wheel 4 has impeller blades 14 with a greater axial extent than the second fan wheel 5 .
  • the hub diffuser 26 is formed on the hub 25 of the second fan wheel 5 with a cross section that tapers conically.
  • the axially shorter impeller blades 15 on the second fan wheel 5 are only arranged in the section of the hub 25 parallel to the axis of rotation, so that the hub diffuser wall surface of the hub diffuser facing the flow channel 3 is formed without impeller blades 15 or other components and only the tapering cross section of the hub diffuser wall surface on the downstream side flow acts.
  • the area in the flow channel 3 adjoining the second impeller 5 in the direction of flow can be freely traversed, so that the axial section of the axial fan with the hub diffuser 26 is designed as a freely traversable free space.
  • the housing diffuser 27 formed at the outlet of the housing can be clearly seen, which has a rounded housing diffuser wall surface.
  • the fan wheel 5 with its hub 25 is positioned within the housing 2 in such a way that the housing diffuser 27 and the hub diffuser 26 overlap in an axial plane.
  • Both diffusers thus work together directly and increase the flow channel cross-sectional area of the flow channel 3 at the outlet in the embodiment shown by 28%, as can also be seen in the sectional views F and G of FIG Figures 4 and 5 can be seen.
  • the embodiment of the invention is not limited to the preferred exemplary embodiments specified above, in particular not to the embodiment of multi-stage axial fans. However, the advantageous fluidic effect is particularly pronounced in the multi-stage design.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP22161823.4A 2021-03-24 2022-03-14 Diffuseur d'écoulement sans aube Pending EP4063663A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021107355.3A DE102021107355A1 (de) 2021-03-24 2021-03-24 Schaufelloser Strömungsdiffusor

Publications (1)

Publication Number Publication Date
EP4063663A1 true EP4063663A1 (fr) 2022-09-28

Family

ID=80739067

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22161823.4A Pending EP4063663A1 (fr) 2021-03-24 2022-03-14 Diffuseur d'écoulement sans aube

Country Status (2)

Country Link
EP (1) EP4063663A1 (fr)
DE (1) DE102021107355A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080031723A1 (en) * 2006-08-02 2008-02-07 Nidec Corporation Axial fan unit
US20090035154A1 (en) * 2007-07-31 2009-02-05 Delta Electronics, Inc. Serial fan module and frame structure thereof
US20160040684A1 (en) * 2014-08-06 2016-02-11 Nidec Corporation Axial fan and fan assembly
KR20200116301A (ko) * 2019-04-01 2020-10-12 엘지전자 주식회사 팬 어셈블리

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3320215B1 (fr) 2015-07-09 2022-02-09 Bascom Hunter Technologies, Inc. Ventilateur axial compact

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080031723A1 (en) * 2006-08-02 2008-02-07 Nidec Corporation Axial fan unit
US20090035154A1 (en) * 2007-07-31 2009-02-05 Delta Electronics, Inc. Serial fan module and frame structure thereof
US20160040684A1 (en) * 2014-08-06 2016-02-11 Nidec Corporation Axial fan and fan assembly
KR20200116301A (ko) * 2019-04-01 2020-10-12 엘지전자 주식회사 팬 어셈블리

Also Published As

Publication number Publication date
DE102021107355A1 (de) 2022-09-29

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