EP3768977B1 - In einer drehrichtung anzutreibendes lüfterrad - Google Patents

In einer drehrichtung anzutreibendes lüfterrad Download PDF

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Publication number
EP3768977B1
EP3768977B1 EP19717110.1A EP19717110A EP3768977B1 EP 3768977 B1 EP3768977 B1 EP 3768977B1 EP 19717110 A EP19717110 A EP 19717110A EP 3768977 B1 EP3768977 B1 EP 3768977B1
Authority
EP
European Patent Office
Prior art keywords
hub
drive
drive unit
fan blades
fan
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.)
Active
Application number
EP19717110.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3768977A1 (de
Inventor
Karl Hägele
Markus Lechler
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.)
IE Assets GmbH and Co KG
Original Assignee
IE Assets GmbH and Co KG
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Publication date
Application filed by IE Assets GmbH and Co KG filed Critical IE Assets GmbH and Co KG
Publication of EP3768977A1 publication Critical patent/EP3768977A1/de
Application granted granted Critical
Publication of EP3768977B1 publication Critical patent/EP3768977B1/de
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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
    • 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
    • F04D29/34—Blade mountings
    • F04D29/36—Blade mountings adjustable
    • F04D29/362—Blade mountings adjustable during rotation
    • 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
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
    • F05B2260/74—Adjusting of angle of incidence or attack of rotating blades by turning around an axis perpendicular the rotor centre line

Definitions

  • the invention relates to a fan wheel to be driven in one direction of rotation.
  • the hub of the fan wheel has radial fan blades projecting on the peripheral side. These engage via pinions on the foot side of their blade axes between two drive tracks which are parallel to the plane of rotation of the fan wheel and are axially spaced apart from one another and are in permanent engagement with these drive tracks in a torque-transmitting manner.
  • the drive tracks which are coupled via the pinion and are axially opposite one another, can be adjusted in rotation about the hub axis by means of an adjusting drive which is accommodated in the hub and is coaxial with the hub; this means that the blade angles of the fan blades can also be adjusted via the pinions, in each case according to the given direction of rotation of the drive to a desired flow rate.
  • the invention relates to a fan wheel which, despite its limitation to only one driving direction of rotation and the resulting restricted requirements for the associated drive unit, meets the requirements for opposite conveying directions and for variability in the conveying volume, in particular depending on an axial load on the fan wheel, but also optionally selected ones. freely adjustable axial load on the fan wheel.
  • the fan wheel with a hub which is coaxial to the drive unit, preferably accommodates and/or encloses at least part of the drive unit and is axially displaceable with limited play and driven with rotational play to the drive unit.
  • the radial fan blades are held in this hub so that they can rotate about their blade axes and are supported synchronously in a drive-connected manner against the drive unit in a fixed position and axially spaced apart from one another, corresponding to the load-dependent axial adjustment of the hub to the drive unit.
  • the rotational play of the hub to the drive unit and thus the conversion of the fan blades mounted in the hub in their alignment to the plane of rotation of the fan wheel is also dampening and/or limited to at least one switching window depending on the temperature.
  • an adjusting drive is provided within the scope of the invention, namely in the axial connection between the drive unit and the hub head, with - non-rotatably to the hub head and together with the hub head corresponding to the axial play between the hub and drive unit axially displaceable - a switching star is provided.
  • This star switch is located in the axial overlapping area of two ring disks, which are connected to the drive unit, in particular a drive part of the drive unit, in a rotationally fixed and positionally fixed manner and in relation to which the star switch is axially adjustable within the scope of the intended axial play of the hub relative to the drive part.
  • These ring disks are not only connected to one another in a fixed position, but are also provided with the same meandering structures with respect to their inner circumference, to which an opposite meandering structure is provided on the circumference on the part of the switching star.
  • the switching process in the changeover from blowing to suction, or vice versa - and thus also the change in the axial load on the fan wheel, which depends on the air throughput and the direction of flow, is proportional small angle of rotation limited.
  • This angle of rotation range is dimensioned sufficiently to enable a largely unimpeded axial transition of the switching star from a given level position of one of the annular disks to the level of the other annular disk.
  • the switching process is not dependent on and/or associated with high actuating forces, especially since the rotation of the fan blades about their axes of rotation and over their transition level associated with the switching also promotes an overshooting of the switching level due to inertia in the event of abrupt switching processes, also as a function of inertial forces.
  • the switching forces required to change the conveying direction are introduced via the air impingement on the fan wheel, and thus only indirectly as a function of the controllable drive power.
  • the hub can also be assigned a separate adjusting device.
  • This adjusting device can be designed to work magnetically in a simple manner, so that, if necessary, via the Adjusting device alone and / or in combination with the aerodynamic loading, the changeover of the fan blades can be effected on the envelope level.
  • the number of switching windows can be selected in accordance with the respective shape of the meandering contouring, which requires at least two switching windows lying opposite one another with regard to the axis of rotation with regard to a support that is symmetrical to the axis of rotation and with regard to a smooth axial displacement of the switching star against the ring disks can also have adapted leading flanks.
  • the fan wheel according to 2 this in 1 is shown in detail in a perspective exploded view, is denoted overall by 1 and, as part of a drive unit 2, comprises a drive part 4 coaxial with the axis of rotation 3.
  • a respective motor drive possibly also an electric motor drive, can be integrated into this drive part 4, forming a drive unit 2, or also be provided directly or indirectly coupled.
  • the drive part 4 is preferably provided with two coaxially opposite annular drive tracks 6 and 7 in the direction of the axis of rotation 3 of the fan wheel 1, which form the opposite side walls of an annular channel 24 open radially outwards, into which the peg-like, in the hub 5 mounted foot parts 12 of the radial fan blades 8 of the fan wheel 1 protrude with radial play.
  • the projecting into the ring channel 24 ends of the peg-like foot parts 12 are preferably formed by drive elements such as pinion 10, the at Power transmission to one of the drive tracks 6, 7 against the other drive track 7.6 each in the circumferential direction are rotatable with limited play.
  • the drive part 4 can be displaced in the direction of the axis of rotation 3 within the scope of an axial play S, which alternatively allows the pinion 10 to be supported against one of the opposite drive tracks 6, 7 in the drive.
  • the fan blades 8 can be rotated about their blade axes 9 by this engagement of their end, preferably formed by a pinion 10, of the pin-like foot part 12 between the drive tracks 6 and 7 and the respective drive support for one of these drive tracks 6, 7.
  • This ability to rotate the fan blades 8 about their blade axes 9 enables the fan wheel 1 to be switched to opposite conveying directions while the direction of rotation of the fan wheel 1 remains the same, so that it is possible, for example, to switch between a working operation with suction of an air flow through an upstream cooler 11 from a suction position 25 and into a blowing position 26. in which a blowing against the cooler 11 directed air flow is generated via the fan wheel 1 in order - to free the cooler 11 of attached impurities - when blowing against the cooler 11.
  • a reversal of the conveying direction thus results with the same drive direction of rotation when the fan blades 8 are turned over via a turning plane 14 lying transversely to the circumferential plane 13 of the fan wheel 1.
  • the envelope plane 14 lies in the transition between the suction position 25 and blowing position 26 in suction operation and blowing operation assumed blade positions and corresponds to an intermediate, direction-neutral transition position of the fan blades 8 in relation to the conveying directions in suction and blowing operation.
  • the changeover via the envelope plane 14 is not associated with a change in the air impingement of the fan blades between their blade surfaces 33 and 34, which are opposite to the blade blade plane, as in the embodiment according to Figures 7 and 8 .
  • the same conveying conditions are thus given in both conveying directions.
  • the exemplary embodiment provides for the changeover of the fan blades 8 in their conveying direction under the influence of aerodynamic and/or inertia-related actuating forces, such as initiated by a brief interruption, e.g. B. Switching off the drive.
  • corresponding actuating pulses can be applied to the hub 5, for example by means of mechanical or electrical actuating devices, with which a desired, ie arbitrarily initiated changeover as well as a rotational fixation of the fan wheel can be achieved.
  • a relevant adjusting device 35 can, for example, be used in addition to or independently of the aerodynamic loading, for example for Specification of speed-dependent and/or temperature-dependent switchover points.
  • the actuator 35 is in 1 illustrated axially following the drive part 4 as an electrically controllable magnetic actuator, which is supported axially in a fixed position.
  • the drive tracks 6, 7 are formed by ring gears which are opposite one another with their ring gears 29 and between which the pinions 10 protrude.
  • the pinion 10 has enough play in relation to the ring gears 29 that, depending on the size of the backlash between the toothing of the ring gears 29 and the pinion 10, there is no drive loading between the respective pairs of teeth when the hub 5 is subjected to an axial load, but there is play in the pinion 10 to the ring gears 29 are still fixed synchronously in terms of rotation, so that all fan blades 8 have mutually corresponding adjustment positions.
  • This conversion takes place in the exemplary embodiment via a concentric to the drive part 4 and the hub 5, from the Hub 5 enclosed actuator 15, as for example in 1 is illustrated.
  • This adjusting drive 15 comprises two annular disks 16, 17 which are concentric to the axis of rotation 3 of the fan wheel 1 and are therefore also coaxial to the hub axis and which are each provided with at least essentially congruent, approximately meandering inner contours 18 on their inner ring circumference, which delimits their central recess.
  • the annular disks 16, 17 are offset from one another in the circumferential direction and connected to one another in an axially fixed position.
  • Matched to the inner contour 18 of the ring disks 16, 17 is a switching star 19 with a circumferential, complementary meandering outer contour 32.
  • the respective meandering contouring 18 or 32 results from the fact that the ring disks 16, 17 have recesses 20 open to the respective inner ring circumference, which are delimited from one another by arms 21 projecting radially between the recesses 20.
  • the complementary outer contouring 32 of the switching star 19 provides arms 22 that protrude against its outer circumference, i.e. radially outwards, to form recesses 23 in between in the circumferential direction, with the distance measured in the circumferential direction between the respective radially protruding adjacent arms 21 of the ring disks 16, 17, and thus the width of the recesses 20 of the annular discs 16, 17, measured in the circumferential direction, is greater than the width of the arms 22 of the switching star 19.
  • the switching star 19 has a respective arm 22 with respect to a respective receiving recess 20 of one of the ring disks 16, 17 in the circumferential direction, so that a switching window 30 is formed.
  • the snag-free gliding of the arms 22 of the switching star 19 in corresponding recesses 20 can be facilitated by rounded edges and / or bevels.
  • the switching star 19 is supported in a fixed position relative to the coaxial hub 5 in an axial overlapping position with respect to the annular discs 16, 17 and, corresponding to the axial loading of the hub 5 by the opposing axial loading forces in "suction operation" 25 or "blowing operation” 26, lies in relation to one of the annular disks 16 , 17 in the same plane, the annular discs 16, 17 mutually support each other due to their combination to form a "package" and, despite their small thickness, can also transmit large torques to the switching star 19 while maintaining their flat design.
  • the thickness of which is matched to the thickness of the ring disks 16, 17 at least in the area of its outer contour, there is the possibility of reinforcing this in the area of its central area by thickening or the like and/or bulging like a bowl. In particular, this also comes into question with regard to the rigid connection of the star wheel 19 to the hub head 27 .
  • the axial loading of the fan wheel 1 associated with the blowing state decreases as the alignment of the fan blades 8 approaches their envelope plane 14, leads in a border area around the Turnover level for reversing the axial loading of the fan wheel and turning over the blades 8 and for changing the contact of the pinion 10 between the drive tracks 6 and 7. This takes place in the area of the switching window 30 provided.
  • At least one switching window 30 is provided over the respective circumference, but preferably at least two or more diametrically opposite switching windows 30 are also provided with regard to supporting forces that are symmetrical to the axis of rotation 3.
  • the invention makes it possible, regardless of the Extension of the functions a very compact structure.
  • the rotational play between the selector star 19 and the respective ring disk 16, 17 located in the axial overlapping position has a low-impact transition when changing the selector star 19 between the ring disks 16, 17 due to the corresponding rotational speeds and the result of the drive connection that is interrupted in each case with limited play.
  • the separation according to the invention of the axial and radial engagement path in the drive connection between the drive part 4 and the hub 5 acted upon by the aerodynamic force has an advantageous effect on the structural design options, in particular with regard to the design of the actuating drive 15 from elements which are easy to produce and interact with one another in a space-saving manner. which, with mutual support between these elements, also enables a very light and compact design.
  • the actuator 15 according to the invention has the result that the fan blades 8 are stationarily “engaged” via the pinions 10 assigned to them with one of the drive tracks 6, 7 and the fan wheel 1 is thus supported in a rotationally fixed manner via drive tracks parallel to the drive part 4. This is due to the engagement of the pinion 10 in one of the drive tracks 6, 7 and the mounting of the fan blades 8 in the hub 5, which is non-rotatable in relation to the drive part 4, which leads to mutual relief.
  • a design is provided in which the fan blades 8 are positioned at the foot side between two to the drive unit 2 in a fixed position and engage in the direction of the axis of rotation 3 of the fan wheel 1 coaxially opposite drive tracks 6.7 and in their wing angle by driving one of the drive tracks 6.7 around their wing axes 8 via an envelope plane 14 in opposite conveying directions are convertible, wherein the envelope plane 14 is transverse to the circulation plane 13 or, according to Figures 7 and 8 , the envelope plane 14 coincides with the circulation plane 13.
  • the direction of rotation of the driven fan wheel 1 is illustrated by the arrow 31 .
  • the fan blades 8 are set at an angle to the direction of rotation 31, and thus also to the plane of rotation 13 of the fan wheel, depending on the desired direction of conveyance, based on 7 in the sense of a blowing operation in a blowing position 26 accordingly figure 5 and in 8 in the sense of a suction operation in a suction position 25 analogous to 3 .
  • the changeover between suction and blowing operation takes place via a turnover plane 36, which is neutral with respect to the conveying direction and coincides with the circulation plane 13, as the turnover position.
  • the reversal position of the fan blades 8, which is neutral with respect to the conveying direction, can also be used according to the invention as a held intermediate layer in order to interrupt and temporarily switch off the air conveyance despite the possibly continuous drive of the fan impeller 1.
  • the intermediate layer to be held can be adjusted and held via the adjusting device 35, in particular also in the configuration as a magnetic adjuster, also independently of other adjusting forces acting on the fan impeller 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Automatic Cycles, And Cycles In General (AREA)
EP19717110.1A 2018-03-20 2019-03-15 In einer drehrichtung anzutreibendes lüfterrad Active EP3768977B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018106455.1A DE102018106455B4 (de) 2018-03-20 2018-03-20 In einer Drehrichtung anzutreibendes Lüfterrad
PCT/DE2019/100234 WO2019179562A1 (de) 2018-03-20 2019-03-15 In einer drehrichtung anzutreibendes lüfterrad

Publications (2)

Publication Number Publication Date
EP3768977A1 EP3768977A1 (de) 2021-01-27
EP3768977B1 true EP3768977B1 (de) 2023-04-26

Family

ID=66102839

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19717110.1A Active EP3768977B1 (de) 2018-03-20 2019-03-15 In einer drehrichtung anzutreibendes lüfterrad

Country Status (8)

Country Link
US (1) US11365749B2 (pl)
EP (1) EP3768977B1 (pl)
DE (1) DE102018106455B4 (pl)
DK (1) DK3768977T3 (pl)
ES (1) ES2951018T3 (pl)
FI (1) FI3768977T3 (pl)
PL (1) PL3768977T3 (pl)
WO (1) WO2019179562A1 (pl)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019134887A1 (de) * 2019-12-18 2021-06-24 Ie Assets Gmbh & Co. Kg Lüfterrad
US11778947B2 (en) * 2021-01-13 2023-10-10 Deere & Company Automated adjustable angle of incidence fan for cleaning sugarcane
CN113082276B (zh) * 2021-04-09 2022-12-23 河北医科大学第二医院 一种预防院内感染的消毒灭菌护理装置
CN114576188B (zh) * 2022-02-23 2023-04-25 浙江尔格科技股份有限公司 换热器用可自动调节风向的风机

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563011A (en) * 1948-06-29 1951-08-07 Arthur E Dehnicke Two-part hub adjustable pitch fan
US3054458A (en) * 1959-07-11 1962-09-18 Marsico Corrado Variable pitch fan
GB1443735A (en) 1972-09-08 1976-07-21 Parsons Co Ralph M Production of substitute natural gas
JPS6027837B2 (ja) * 1981-07-31 1985-07-01 株式会社荏原製作所 軸流送風機
US4919623A (en) * 1989-02-13 1990-04-24 Amp Incorporated Burn-in socket for integrated circuit device
US6592328B1 (en) * 2001-04-17 2003-07-15 Emerson Electric Co. Method and apparatus for adjusting the pitch of a fan blade
DE102004035631B4 (de) * 2004-07-22 2006-04-13 Hägele GmbH Lüfterrad, insbesondere im Kühlsystem von Brennkraftmaschinen einsetzbares Lüfterrad
US20120240878A1 (en) * 2011-03-21 2012-09-27 Haegele Karl Internal combustion engine with fan system

Also Published As

Publication number Publication date
EP3768977A1 (de) 2021-01-27
PL3768977T3 (pl) 2023-08-21
WO2019179562A1 (de) 2019-09-26
US20210003141A1 (en) 2021-01-07
US11365749B2 (en) 2022-06-21
ES2951018T3 (es) 2023-10-17
DK3768977T3 (da) 2023-07-24
DE102018106455B4 (de) 2020-03-26
DE102018106455A1 (de) 2019-09-26
FI3768977T3 (fi) 2023-07-25

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