EP4063662A1 - Ventilateur axial à plusieurs étages - Google Patents

Ventilateur axial à plusieurs étages Download PDF

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Publication number
EP4063662A1
EP4063662A1 EP22160876.3A EP22160876A EP4063662A1 EP 4063662 A1 EP4063662 A1 EP 4063662A1 EP 22160876 A EP22160876 A EP 22160876A EP 4063662 A1 EP4063662 A1 EP 4063662A1
Authority
EP
European Patent Office
Prior art keywords
axial
fan wheel
fan
wheel
radial webs
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
EP22160876.3A
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 EP4063662A1 publication Critical patent/EP4063662A1/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
    • F04D19/007—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
    • F04D29/40—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
    • F04D29/542—Bladed diffusers
    • F04D29/544—Blade shapes
    • 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
    • F05D2250/40—Movement of components
    • F05D2250/44—Movement of components by counter rotation

Definitions

  • the invention relates to a multi-stage, in particular two-stage, axial fan with a housing forming a flow channel and a first and second fan wheel which can be rotated about an axis of rotation and which are accommodated in the housing and together generate an axial flow during operation.
  • Generic multi-stage axial fans are known from the prior art. These are used, for example, to cool compact high-performance machines such as highly integrated electronics in the areas IT, telecommunications, network technology and renewable energy used when conventional individual fans are too weak. In a two-stage axial flow fan, two connected individual fans work together and offer high efficiency with a minimum space requirement.
  • the object of the present invention is to further increase the efficiency of such a multi-stage axial fan and to reduce the noise development.
  • an axial fan is proposed with a housing that forms a flow channel and a first and second fan wheel that is accommodated in the housing and is rotatable about an axis of rotation.
  • the first fan wheel is arranged axially in series with the second fan wheel.
  • the fan wheels generate an axial flow through the flow channel, with a non-rotatable web arrangement having a plurality of radial webs being provided axially between the first fan wheel and the second fan wheel, which extend radially through the flow channel and have a curved profile.
  • the curved profiling is designed in such a way that a swirl of the axial flow of the first fan wheel generated during operation is converted into static pressure.
  • the radial webs each form a flow guide surface influencing the axial flow from the first to the second fan wheel.
  • the workload distribution between the first impeller and the second impeller is thus determined such that when both impellers are in operation, the workload of the first intake-side impeller is lower than the workload of the second outflow-side impeller.
  • the axial flow generated by the first fan impeller flows against the curved profiling of the radial webs of the web arrangement. through the curved profiling, the twist of this axial flow of the first fan wheel is partly converted into static pressure. The remaining twist that is still present is then removed by the second fan wheel with a comparatively lower build-up of static pressure than would be the case in an embodiment without radial ribs or with radial ribs without a profiled curvature.
  • the curved profiling of the radial webs is formed by a three-dimensional curvature of the radial webs.
  • the curvature thus takes place in relation to at least two planes.
  • the radial webs have, for example, a twisted shape.
  • the three-dimensional curvature of the radial webs is formed by a curvature of the radial webs at least in the axial direction and in the circumferential direction.
  • Circumferential camber corresponds to a type of forward camber or backward camber known in the impeller art.
  • a curvature in the axial direction of the radial webs leads to a flow guide surface along the axis of rotation, which is curved relative to an axial plane and thus the flow guide surface influences the axial flow along the axial direction.
  • the radial webs each have a leading edge and a trailing edge, as seen in the axial direction of flow.
  • An advantageous embodiment provides that the inflow edge and the outflow edge are each shaped differently, with the inflow edge having a more curved profile with respect to a radial plane than the outflow edge.
  • an embodiment is favorable in which the radial webs of the web arrangement of the axial fan have a greater axial extent in terms of absolute value in a radially outer edge section than in a radial one inner edge section.
  • the radial webs are axially wider radially on the outside than lying further radially on the inside, and in doing so offer an axially longer flow guide surface in the radially outer region.
  • the axial flow fan is further characterized in that it has a ring part.
  • the ring member forms part of the housing and includes the web assembly.
  • 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, while 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 first 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 first 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 second fan wheel has a hub from which fan wheel blades extend radially outwards and the second fan wheel forms a hub diffuser on the outflow side on the hub.
  • the axially shorter impeller blades on the second fan wheel create axial space for the hub diffuser.
  • the flow rate behind the second fan wheel can be delayed using the hub diffuser. This is done by gradually reducing the hub diameter and the associated increase in the free flow cross section.
  • One embodiment of the axial fan provides that the hub diffuser is connected to a region of the hub in which the fan wheel blades are formed, so that the hub diffuser is free of fan wheel blades. This also has a positive effect on solving the tasks.
  • the axial fan is characterized in one embodiment variant in that the motor mount has a plurality of recesses and stiffening struts distributed alternately in the circumferential direction.
  • the recesses ensure that there can be a flow in the axial direction and a cooling effect in the area of the motor mount and therefore of the motor or motors. In addition, weight is saved.
  • the axial fan is designed in particular in such a way that the first fan wheel and the second fan wheel are positioned relative to one another in such a way that during operation counterrotating rotation of the first fan wheel to the second fan wheel about the axis of rotation generates the axial flow parallel to the axis of rotation.
  • the second fan wheel can convert the residual spin of the first fan wheel into delivery capacity in a particularly efficient manner.
  • An embodiment of the axial fan also provides that the first and the second fan wheel each form a hub from which the first and second Fan wheel blades extend radially outward.
  • the hubs, together with the motor mount, each run parallel in an axial plane and thus form a radially inner wall surface of the flow channel parallel to the axis of rotation.
  • the flow channel is therefore delimited by the inner surface of the housing wall and by the hubs and the motor mount.
  • FIG 1 an exemplary embodiment of an axial fan 1 is shown in a lateral sectional view.
  • the axial fan 1 comprises a three-part, nested housing 2, in which seen axially in a row in the direction of flow S, the first fan wheel 4, the fixed, non-rotatable web arrangement 6 and the second fan wheel 5 are accommodated and together determine the flow channel 3 parallel to the axis of rotation RA of the fan wheels 4, 5.
  • 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.
  • the ring part 10 is in the Figures 2 - 4 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 portion, which is connected to the outer ring 76 of the motor mount 12 respectively.
  • 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 .
  • the leading edge 8 is provided with a more curved course compared to a radial plane the trailing edge 9.
  • the radial webs 7 extend radially through the flow channel 3 and have a curved profile.
  • 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.
  • 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 widens in the main flow direction.
  • the axially shorter impeller blades 15 on the second fan impeller 5 are only arranged in the section of the hub 25 parallel to the axis of rotation, so that the hub diffuser 26 is free of impeller blades 15 .
  • the implementation of the invention is not limited to the preferred exemplary embodiments specified above. Rather, it is a number of variants, which makes use of the solution shown even in fundamentally different designs, in particular one or more further stages can be provided by further fan wheels, additional ring parts, even if this is not shown in the exemplary embodiment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP22160876.3A 2021-03-24 2022-03-08 Ventilateur axial à plusieurs étages Pending EP4063662A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021107361.8A DE102021107361A1 (de) 2021-03-24 2021-03-24 Mehrstufiger Axiallüfter

Publications (1)

Publication Number Publication Date
EP4063662A1 true EP4063662A1 (fr) 2022-09-28

Family

ID=80683824

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22160876.3A Pending EP4063662A1 (fr) 2021-03-24 2022-03-08 Ventilateur axial à plusieurs étages

Country Status (2)

Country Link
EP (1) EP4063662A1 (fr)
DE (1) DE102021107361A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007022663A1 (de) * 2006-05-15 2007-12-13 Denso Corp., Kariya Gebläseeinheit
US20080031723A1 (en) * 2006-08-02 2008-02-07 Nidec Corporation Axial fan unit
US20090060732A1 (en) * 2007-08-31 2009-03-05 Delta Electronics, Inc. Serial fan module and frame structure thereof
US20170122327A1 (en) * 2014-06-06 2017-05-04 Ebm-Papst St. Georgen Gmbh & Co. Kg Fan arrangement
US20200378401A1 (en) * 2019-05-31 2020-12-03 Minebea Mitsumi Inc. Axial flow fan device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4128194B2 (ja) 2005-09-14 2008-07-30 山洋電気株式会社 二重反転式軸流送風機
DE202006016932U1 (de) 2006-11-02 2006-12-28 Asia Vital Components Co., Ltd., Hsin Chuan City Kühlventilatormodul mit erhöhtem Luftdruck
JP5244620B2 (ja) 2008-05-26 2013-07-24 山洋電気株式会社 送風装置
WO2010048730A2 (fr) 2008-10-30 2010-05-06 Distributed Thermal Systems Ltd. Optimiseur d’écoulement multi-étage
DE102012019795A1 (de) 2012-10-05 2014-04-10 Ziehl-Abegg Ag Ventilatoreinheit
DE202019102382U1 (de) 2019-04-29 2019-06-07 Ebm-Papst Mulfingen Gmbh & Co. Kg Nachleitvorrichtung für einen Axialventilator
DE102019123687A1 (de) 2019-09-04 2021-03-04 Bayerische Motoren Werke Aktiengesellschaft Lüftervorrichtung, Lüftersystem und Belüftungsvorrichtung für ein Fahrzeug sowie Fahrzeug mit einer Lüftervorrichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007022663A1 (de) * 2006-05-15 2007-12-13 Denso Corp., Kariya Gebläseeinheit
US20080031723A1 (en) * 2006-08-02 2008-02-07 Nidec Corporation Axial fan unit
US20090060732A1 (en) * 2007-08-31 2009-03-05 Delta Electronics, Inc. Serial fan module and frame structure thereof
US20170122327A1 (en) * 2014-06-06 2017-05-04 Ebm-Papst St. Georgen Gmbh & Co. Kg Fan arrangement
US20200378401A1 (en) * 2019-05-31 2020-12-03 Minebea Mitsumi Inc. Axial flow fan device

Also Published As

Publication number Publication date
DE102021107361A1 (de) 2022-09-29

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