EP1998052A2 - Ventilateur axial doté d'un appareil directeur connecté en aval - Google Patents

Ventilateur axial doté d'un appareil directeur connecté en aval Download PDF

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Publication number
EP1998052A2
EP1998052A2 EP08006197A EP08006197A EP1998052A2 EP 1998052 A2 EP1998052 A2 EP 1998052A2 EP 08006197 A EP08006197 A EP 08006197A EP 08006197 A EP08006197 A EP 08006197A EP 1998052 A2 EP1998052 A2 EP 1998052A2
Authority
EP
European Patent Office
Prior art keywords
axial fan
diffuser
vanes
nozzle
guide
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.)
Granted
Application number
EP08006197A
Other languages
German (de)
English (en)
Other versions
EP1998052B1 (fr
EP1998052A3 (fr
EP1998052B9 (fr
Inventor
Gerd Bischof
Augustin Haas
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.)
EVG Lufttechnik GmbH
Original Assignee
EVG Lufttechnik GmbH
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 EVG Lufttechnik GmbH filed Critical EVG Lufttechnik GmbH
Publication of EP1998052A2 publication Critical patent/EP1998052A2/fr
Publication of EP1998052A3 publication Critical patent/EP1998052A3/fr
Publication of EP1998052B1 publication Critical patent/EP1998052B1/fr
Application granted granted Critical
Publication of EP1998052B9 publication Critical patent/EP1998052B9/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • 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
    • 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 downstream distributor.
  • Axial fans are used successfully in many industrial applications, such as the brick industry and the automotive industry.
  • a diffuser behind the fan as seen in the flow direction. The diffuser serves to remove the swirl generated by the fan from the extracted air.
  • the conventional nozzles are limited to hub ratios greater than 0.4. With smaller hub ratios, the number of vanes required increases significantly in conventional nozzles, which increases the cost of construction and reduces the efficiency of the nozzle.
  • the invention has for its object to provide a nozzle, an axial fan with downstream nozzle and a rotary fan, comprising an axial fan and a rotatable housing, whose efficiency compared to conventional nozzles and fans is significantly improved, the noise emission is reduced and have a wide range of applications ,
  • a diffuser for an axial fan wherein the diffuser comprises a plurality of substantially radially arranged vanes, wherein the diffuser is arranged in the flow direction behind an impeller of the axial fan, and wherein the vanes have an inlet edge and a trailing edge, solved in that the leading edges of the vanes are curved.
  • the curvature is understood to mean the course of the leading edge and not the additionally existing curvature of the guide vane in the direction from the leading edge to the trailing edge.
  • a guide blade is not made of a rectangular or trapezoidal sheet metal blank, but in a sheet metal blank for a Guide vane according to the invention, the leading edge of the sheet metal blank is already curved before bending.
  • the depth of the vanes changes continuously over a length of the vanes. It has proven to be particularly advantageous if a depth of the guide vanes in a range between 50% and 80% of the length of the guide vanes, preferably in a range between 60% and 80%, has a minimum. Furthermore, it has proved to be advantageous if the leading edge of the guide vanes is concavely curved.
  • the leading edge of the vane may in many cases be described by a second order polynomial, in particular a parabola, a hyperbola, an ellipse, or a combination thereof.
  • a parabolic leading edge has been found to be suitable.
  • the crest tangent of the parabolic inlet edge runs under an angle ⁇ to a radius R on a vertex S of the parabola, wherein the angle ⁇ is often in a range between 0 ° and 10 °.
  • the course of the leading edge results from the intersection line between said cylinder and a second-order surface, which in cross section has, for example, the shape of a parabola, a hyperbola or an ellipse.
  • Another advantage of the nozzle according to the invention is the reduced by its use noise emission of the axial fan.
  • Another advantage of the nozzle according to the invention is the fact that, compared to conventional nozzles, the number of vanes can be reduced. As a result, production costs are saved and the flow resistance is reduced due to the smaller number of vanes.
  • nozzle according to the invention it is also possible with the nozzle according to the invention to cover hub ratios up to 0.3, which is not possible with conventional downstream nozzles or at least not with reasonable economic effort.
  • a rotary fan comprising an axial fan and a rotatably mounted housing, wherein at least one air outlet opening is provided on the housing, wherein the nozzle has the inventive shape of the guide vanes.
  • FIG. 1 shows a front view of an embodiment of a nozzle according to the invention 1.
  • the nozzle 1 comprises mounting flanges 3, of which in FIG. 1 only one is visible, and a plurality of guide vanes 5, of which only one has been provided with the reference numeral 5 for reasons of clarity.
  • the vanes 5 extend from a hub 7 with a diameter D i to the flanges 3 with the diameter D a .
  • the hub 7 is at the in FIG. 1 illustrated embodiment designed as a pipe section.
  • FIGS. 2b and c results, between the flanges 3, an outer tube section 9 is provided.
  • the distributor 1 is designed as a welded construction. This means that the guide vanes 5 are welded at their first end to the hub 7 and at its second end to the pipe section 9.
  • the invention is not limited to weldments or certain materials.
  • the vanes 5 each have an entry edge 11 and an exit edge 13.
  • a length coordinate L begins at the hub 7 and ends at the pipe section 9.
  • the longitudinal coordinate L extends in the radial direction and begins at an inner diameter D i .
  • a depth T of the vanes 5 extends in the tangential direction.
  • the leading edge 11 is curved.
  • the trailing edge 13 is in the embodiment according to FIG. 1 just.
  • a depth T (r) of the guide vanes 5 depends on the radius R. Starting from a maximum depth at the root of the vane 5, where it is welded to the hub 7, the depth T of the vane 5 decreases steadily until a minimum depth T min is reached. Subsequently, the depth T rises again to the tip of the guide blade 5 "where it is welded to the outer pipe section 9.
  • minimum depth T min of the guide vanes 5 have proven to be optimal: Hub ratio D i / D a Minimum vane depth T min in percent of the depth T (D i ) on the inner diameter D i 0.315 75% 0.35 70% 0.45 75%
  • the concrete design of the concave curvature of the leading edge 11 naturally depends on the dimensions of the distributor, the blading of the axial fan, not shown, as well as the position of the optimum efficiency in the curve. Also, the downstream ones can Components, such as a diffuser or a housing of a rotary fan, have an influence on the flow behavior of the distributor 1 according to the invention. Therefore, it is not possible to specify the geometry of the curvature of the leading edge 11 of the guide vanes 5 according to the invention in the sense of a simple formula. Rather, a combination of measurements and simulation calculations is required in order to determine the optimum design of the leading edge 11 for specific axial fans.
  • a vertex tangent ST of the parabola encloses an angle ⁇ with a radius R of the vertex S. This angle ⁇ may be different from zero. In some applications, an angle ⁇ between 0 ° and 10 °, more preferably between 4 ° and 7 °, has been found to be advantageous.
  • a focal point of the parabola has been provided with the reference symbol F.
  • FIG. 2a is the view according to FIG. 1 shown a little scaled down. Also, not all references have been taken for the sake of clarity.
  • FIG. 2b shows a sectional view taken along the line AA through the nozzle according to the invention, while in the Figure 2c an isometric view of the embodiment of a nozzle according to the invention is shown.
  • the flow direction is indicated by a plurality of arrows 15.
  • the vanes 5 are simply curved in the region of the leading edge 11, wherein the guide vanes 5 extend in the region of the trailing edge 5 parallel to the longitudinal axis of the nozzle 1 and thus the air flowing through the nozzle or the flowing through the nozzle 1 gaseous Medium flows virtually swirl-free from the nozzle 1. It has proven to be particularly advantageous if the guide vanes 5 are curved in the region of the leading edge 11 in the form of a cylinder.
  • FIG. 3 is a side view of a equipped with a nozzle 1 according to the invention rotary fan 17 is shown.
  • the flow direction of the air is again indicated by arrows 15.
  • the rotary fan 17 includes an axial fan 19, a nozzle 1 according to the invention and a housing 21.
  • an impeller 23 is arranged, which is rotated by a drive shaft 25 in rotation.
  • the axial fan 19 may be a conventional axial fan.
  • an inventive nozzle 1 is arranged with vanes 5 in the housing 21 and secured thereto.
  • the housing 21 of the rotary fan is frusto-conical and has a plurality of baffles 27. For reasons of clarity, not all baffles are provided with reference numerals.
  • the baffles 27 cause that the air conveyed by the axial fan 19 or its impeller 23 is blown out horizontally.
  • the housing 21 is in its in FIG. 3 rotatably supported at the bottom and rotates during operation slowly about its longitudinal axis or is during the Operating slowly pivoted about its longitudinal axis. Together with the housing 21, the Nachleitapparat 5 and the housing of the axial fan 19 rotate.
  • the warehouse is in FIG. 3 provided with the reference numeral 29.
  • the outlet direction of the air changes continuously, so that the entire surrounding area of the rotary fan is supplied with dry air, as required, for example, in the manufacture of bricks.
  • the advantages of the nozzle 1 according to the invention can be achieved because the air flows into the housing 21 almost twist-free.
  • all baffles 27 are supplied with almost spin-free dry air and it turns over the entire length of the housing 21, a nearly constant exit velocity of the air from the outlet openings 27 a.
  • a very uniform dry result is achieved and also the performance of the axial fan 19 can be significantly reduced.
  • the throughput can be increased by the drying device in which the rotary fan 17 according to the invention are arranged, or it can be achieved with less energy use, the same drying performance.
  • the characteristic of an axial fan equipped with a Nachleitapparat 1 according to the invention is shown as a solid line, while the characteristic of a equipped with a conventional Nachleitapparat 1 axial fan is shown as a dashed line.
  • FIG. 5 Also in FIG. 5 is the characteristic of an equipped with a Nachleitapparat 1 axial fan according to the invention shown as a solid line, while the characteristic of a equipped with a conventional Nachleitapparat 1 axial fan is shown as a dashed line.
  • the pressure factor ⁇ tot and the efficiency ⁇ tot are based on the total pipe outlet area and were determined with a pressure-side equalizing pipe with a length of 2 x pipe diameter.

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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)
EP08006197A 2007-06-01 2008-03-29 Ventilateur axial doté d'un appareil directeur connecté en aval Not-in-force EP1998052B9 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007025696A DE102007025696A1 (de) 2007-06-01 2007-06-01 Axiallüfter mit nachgeschaltetem Leitapparat

Publications (4)

Publication Number Publication Date
EP1998052A2 true EP1998052A2 (fr) 2008-12-03
EP1998052A3 EP1998052A3 (fr) 2009-10-28
EP1998052B1 EP1998052B1 (fr) 2012-08-15
EP1998052B9 EP1998052B9 (fr) 2013-02-27

Family

ID=39590331

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08006197A Not-in-force EP1998052B9 (fr) 2007-06-01 2008-03-29 Ventilateur axial doté d'un appareil directeur connecté en aval

Country Status (2)

Country Link
EP (1) EP1998052B9 (fr)
DE (1) DE102007025696A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019110934A1 (de) * 2019-04-29 2020-10-29 Ebm-Papst Mulfingen Gmbh & Co. Kg Nachleitvorrichtung für einen Axialventilator
DE102019134796A1 (de) * 2019-12-17 2021-06-17 Langmatz Gmbh Verteilerschrank und Belüftungsvorrichtung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010051760A1 (de) 2010-11-17 2012-05-24 Evg Lufttechnik Gmbh Axiallüfter mit vorgeschalteter Anschlusshaube und einem nachgeschalteten Leitapparat
DE102010051759A1 (de) 2010-11-17 2012-05-24 Evg Lufttechnik Gmbh Axiallüfter mit nachgeschaltetem Leitapparat und einer Einrichtung zur Vergleichmäßigung der Strömungsgeschwindigkeit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1928391A1 (de) 1969-06-04 1970-12-10 Max Wagner Getriebeloser Antrieb fuer Luftverteiler
WO1989012174A1 (fr) 1988-06-08 1989-12-14 ABB Fläkt AB Aube directrice pour soufflante axiale

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE607134C (de) * 1932-10-26 1934-12-18 Paul Havard Leitschaufeln fuer Schraubenventilatoren
US6142733A (en) * 1998-12-30 2000-11-07 Valeo Thermique Moteur Stator for fan
US7811055B2 (en) * 2004-04-26 2010-10-12 Behr Gmbh & Co. Kg Fan housing for a heat exchanger, particular for motor vehicles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1928391A1 (de) 1969-06-04 1970-12-10 Max Wagner Getriebeloser Antrieb fuer Luftverteiler
WO1989012174A1 (fr) 1988-06-08 1989-12-14 ABB Fläkt AB Aube directrice pour soufflante axiale

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019110934A1 (de) * 2019-04-29 2020-10-29 Ebm-Papst Mulfingen Gmbh & Co. Kg Nachleitvorrichtung für einen Axialventilator
DE102019134796A1 (de) * 2019-12-17 2021-06-17 Langmatz Gmbh Verteilerschrank und Belüftungsvorrichtung
DE102019134796B4 (de) 2019-12-17 2023-02-02 Langmatz Gmbh Verteilerschrank

Also Published As

Publication number Publication date
DE102007025696A1 (de) 2008-12-04
EP1998052B1 (fr) 2012-08-15
EP1998052A3 (fr) 2009-10-28
EP1998052B9 (fr) 2013-02-27

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