EP1998052B9 - Axial ventilator with subsequent guide vane apparatus - Google Patents
Axial ventilator with subsequent guide vane apparatus Download PDFInfo
- Publication number
- EP1998052B9 EP1998052B9 EP08006197A EP08006197A EP1998052B9 EP 1998052 B9 EP1998052 B9 EP 1998052B9 EP 08006197 A EP08006197 A EP 08006197A EP 08006197 A EP08006197 A EP 08006197A EP 1998052 B9 EP1998052 B9 EP 1998052B9
- Authority
- EP
- European Patent Office
- Prior art keywords
- guide vanes
- rotary fan
- fan according
- guide
- inlet edge
- 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.)
- Not-in-force
Links
- ASNHGEVAWNWCRQ-UHFFFAOYSA-N 4-(hydroxymethyl)oxolane-2,3,4-triol Chemical compound OCC1(O)COC(O)C1O ASNHGEVAWNWCRQ-UHFFFAOYSA-N 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000012356 Product development Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
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 a rotary fan comprising an axial fan with downstream distributor, as it is known from DE 1 928 391 A1 is known.
- Rotary 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.
- An example of such an axial fan is from the WO 89/12174 A1 known.
- the invention has for its object to provide a rotary fan comprising an axial fan with downstream diffuser and a rotatable housing, whose efficiency is significantly improved and has a wide range of applications.
- 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 proven 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.
- 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)
Description
Die Erfindung betrifft einen Drehlüfter umfassend einen Axiallüfter mit nachgeschaltetem Leitapparat, wie er aus der
Herkömmliche Leitapparate weisen einfach gekrümmte Leitschaufeln auf, die häufig aus einem aus einem rechteckigen oder trapezförmigen Blechzuschnitt geformt werden. Trotz des nachgeschalteten Leitapparats sind der Wirkungsgrad und die Geräuschentwicklung bei diesen Axiallüftern noch nicht optimal gestaltet.Conventional nozzles have simply curved vanes, which are often formed from one of a rectangular or trapezoidal sheet metal blank. Despite the downstream Leitapparats are the Efficiency and noise in these axial fans not yet optimally designed.
Des Weiteren sind die herkömmlichen Leitapparate auf Nabenverhältnisse von größer 0,4 beschränkt. Bei kleineren Nabenverhältnissen steigt bei herkömmlichen Leitapparaten die Zahl der erforderlichen Leitschaufeln stark an, was die Baukosten erhöht und den Wirkungsgrad des Leitapparats verringert. Ein Beispiel für einen solchen Axiallüfter ist aus der
Der Erfindung liegt die Aufgabe zugrunde, einen Drehlüfter umfassend einen Axiallüfter mit nachgeschaltetem Leitapparat und ein drehbares Gehäuse, bereitzustellen, dessen Wirkungsgrad deutlich verbessert ist und der einen großen Einsatzbereich hat.The invention has for its object to provide a rotary fan comprising an axial fan with downstream diffuser and a rotatable housing, whose efficiency is significantly improved and has a wide range of applications.
Diese Aufgabe wird erfindungsgemäß bei einem Drehlüfter mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved in a rotary fan with the features of
Im Zusammenhang mit der erfindungsgemäßen Gestaltung der Leitschaufeln wird als Krümmung der Verlauf der Eintrittskante und nicht die zusätzlich vorhandene Krümmung der Leitschaufel in Richtung von der Eintrittskante zur Austrittskante verstanden. Anders ausgedrückt: Bei dem erfindungsgemäßen Axiallüfter wird eine Leitschaufel nicht aus einem rechteckigen oder trapezförmigen Blechzuschnitt hergestellt, sondern bei einem Blechzuschnitt für eine erfindungsgemäße Leitschaufel ist die Eintrittskante des Blechzuschnitts auch vor dem Biegen bereits gekrümmt.In connection with the design of the guide vanes according to the invention, 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. In other words, in the axial fan according to the invention, 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.
Es hat sich weiter als vorteilhaft erwiesen, wenn sich die Tiefe der Leitschaufeln über eine Länge der Leitschaufeln stetig ändert. Als besonders vorteilhaft hat sich erwiesen, wenn eine Tiefe der Leitschaufeln in einem Bereich zwischen 50% und 80% der Länge der Leitschaufeln, bevorzugt in einem Bereich zwischen 60% und 80%, ein Minimum aufweist. Des Weiteren hat es sich als vorteilhaft erwiesen, wenn die Eintrittskante der Leitschaufeln konkav gekrümmt ist.It has also proved to be advantageous if 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 proven to be advantageous if the leading edge of the guide vanes is concavely curved.
Diese Geometrien haben bei praktisch ausgeführten Prototypen zu einer Reduktion der Antriebsleistung bei konstanter Förderleistung des Axiallüfters um etwa ein Fünftel geführt.These geometries have led to a reduction of the drive power at a constant capacity of the axial fan by about one fifth in practically executed prototypes.
Da selbstverständlich zwischen dem Axiallüfter und dem Leitapparat eine Wechselwirkung besteht, ist es nicht möglich, im Sinne einer einfachen Formel die Geometrie der Eintrittskante festzulegen. Es hat sich daher bislang als notwendig erwiesen, die optimale Form der Eintrittskante durch eine Kombination aus Simulationsrechnung und einer örtlich hoch aufgelösten Messung der tatsächlichen Strömungsverhältnisse im Übergangsbereich zwischen Axiallüfter und Leitapparat zu ermitteln.Since, of course, an interaction exists between the axial fan and the diffuser, it is not possible to define the geometry of the leading edge in the sense of a simple formula. It has therefore been found to be necessary to determine the optimum shape of the leading edge by a combination of simulation calculation and a high spatial resolution measurement of the actual flow conditions in the transition region between the axial fan and diffuser.
In einer Ansicht von vorne kann die Eintrittskante der Leitschaufel in vielen Fällen durch ein Polynom, Kurve zweiter Ordnung, insbesondere eine Parabel, eine Hyperbel, eine Ellipse oder eine Kombination davon, beschrieben werden.
Bei vielen Anwendungen hat sich eine parabelförmige Eintrittskante als geeignet erwiesen. Dabei verläuft die Scheiteltangente der parabelförmigen Eintrittskante unter einem Winkel β zu einem Radius R auf einen Scheitel S der Parabel, wobei der Winkel β häufig in einem Bereich zwischen 0° und 10° liegt.In a front view, 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.
In many applications, a parabolic leading edge has been found to be suitable. The crest tangent of the parabolic inlet edge runs under an angle β to a radius R on a vertex S of the parabola, wherein the angle β is often in a range between 0 ° and 10 °.
Wenn die Leitschaufel zylindrisch gebogen ist, dann ergibt sich der Verlauf der Eintrittskante aus der Schnittlinie zwischen dem genannten Zylinder und einer Fläche zweiter Ordnung, die im Querschnitt beispielsweise die Form einer Parabel, einer Hyperbel oder einer Ellipse hat.If the guide vane is bent cylindrically, then 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.
Ein weiterer Vorteil des erfindungsgemäßen Leitapparats ist die durch seinen Einsatz reduzierte Geräuschemission des Axiallüfters. Bei versuchsweise ausgeführten Anlagen konnte sogar auf die am Luftauslass vorgesehenen Endschalldämpfer verzichtet werden, was erstens den Gesamtwirkungsgrad der lufttechnischen Einrichtung verbessert und naturgemäß die Investitionskosten sowie den Bauraumbedarf verringert.Another advantage of the nozzle according to the invention is the reduced by its use noise emission of the axial fan. In the case of experimental installations, it was even possible to dispense with the rear silencers provided at the air outlet, which firstly improves the overall efficiency of the ventilation system and, of course, reduces the investment costs and the space requirement.
Da heutzutage Axiallüfter üblicherweise aus Stahlblech und als Schweißkonstruktion ausgeführt werden, sind die Kosten für das Herstellen der Blechzuschnitte für die erfindungsgemäßen Leitschaufeln aufgrund der heutigen Fertigungsmöglichkeiten, insbesondere durch Laserschneiden, nahezu identisch zu den Herstellungskosten einer herkömmlichen Leitschaufel.Since nowadays axial fans are usually made of sheet steel and welded construction, the costs for producing the sheet metal blanks for the guide vanes according to the invention are almost identical to the production costs of a conventional guide blade due to today's production possibilities, in particular by laser cutting.
Selbstverständlich ist ein erheblicher Entwicklungs- und Forschungsaufwand zur Ermittlung des optimalen Verlaufs der Eintrittskante erforderlich. Dieser Aufwand ist jedoch nur bei der Produktentwicklung erforderlich. Bei der Serienfertigung können diese Kosten naturgemäß auf die produzierten Axiallüfter bzw. die produzierten Leitapparate umgelegt werden.Of course, a considerable development and research effort to determine the optimal course of the leading edge is required. However, this effort is required only during product development. In serial production, these costs can of course be transferred to the axial fans produced or the diffusers produced.
Wegen des erheblichen Einsparpotentials von teilweise bis 20% bei der Antriebsleistung und der hohen Nutzungsdauern der industriell eingesetzten Axiallüfter amortisieren sich die Kosten für den erfindungsgemäßen Leitapparat häufig bereits nach kurzer Zeit. Ein weiterer Vorteil des erfindungsgemäßen Leitapparats ist darin zu sehen, dass, verglichen mit herkömmlichen Leitapparaten, die Zahl der Leitschaufeln verringert werden kann. Dadurch werden Produktionskosten eingespart und der Strömungswiderstand aufgrund der geringeren Zahl der Leitschaufeln reduziert.Because of the considerable savings potential of sometimes up to 20% in the drive power and the high service life of the industrially used axial fans, the costs for the distributor according to the invention often pay for themselves after a short time. 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.
Auch ist es mit dem erfindungsgemäßen Leitapparat möglich, Nabenverhältnisse bis zu 0,3 abzudecken, was mit herkömmlichen nachgeschalteten Leitapparaten nicht oder zumindest nicht mit vertretbarem wirtschaftlichem Aufwand möglich ist.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.
Weitere Vorteile und vorteilhafte Ausgestaltungen der Erfindung sind der nachfolgenden Zeichnung, deren Beschreibung und den Patentansprüchen entnehmbar. Alle in der Zeichnung, deren Beschreibung und den Patentansprüchen offenbarten Merkmale können sowohl einzeln als auch in beliebiger Kombination miteinander erfindungswesentlich sein.Further advantages and advantageous embodiments of the invention are the following drawings, the description and the claims removable. All of the features disclosed in the drawing, the description and the claims can be essential to the invention both individually and in any combination with one another.
In der Zeichnung zeigen:
Figur 1- eine Ansicht von vorne auf ein Ausführungsbeispiel eines erfindungsgemäßen Leitapparats;
- Figur 2
- das Ausführungsbeispiel gemäß
in verschiedenen Ansichten,Figur 1 Figur 3- einen Drehlüfter mit Axiallüfter und erfindungsgemäßem Leitapparat in einer Seitenansicht und
Figur 4- ein weiteres Ausführungsbeispiel eines erfindungsgemäßen Axiallüfters.
Figur 4- ein Diagramm, welches die Druckerhöhung in Abhängigkeit der Durchflusszahl zeigt und
Figur 5- ein Diagramm, welches den Wirkungsgrad in Abhängigkeit der Durchflusszahl zeigt.
- FIG. 1
- a front view of an embodiment of a nozzle according to the invention;
- FIG. 2
- the embodiment according to
FIG. 1 in different views, - FIG. 3
- a rotary fan with axial fan and inventive nozzle in a side view and
- FIG. 4
- a further embodiment of an axial fan according to the invention.
- FIG. 4
- a diagram showing the pressure increase as a function of the flow rate and
- FIG. 5
- a diagram showing the efficiency as a function of the flow rate.
Bei dem Ausführungsbeispiel gemäß
Die Leitschaufeln 5 weisen jede eine Eintrittskante 11 und eine Austrittskante 13 auf. Eine Längenkoordinate L beginnt an der Nabe 7 und endet am Rohrabschnitt 9. Die Längenkoordinate L verläuft in radialer Richtung und beginnt an einem Innendurchmesser Di. Eine Tiefe T der Leitschaufeln 5 verläuft in tangentialer Richtung.The
Bei der erfindungsgemäßen Geometrie der Leitschaufeln 5 ist die Eintrittskante 11 gekrümmt ausgeführt. Die Austrittskante 13 ist bei dem Ausführungsbeispiel gemäß
Es hat sich bei ausgeführten Prototypen als vorteilhaft erwiesen, wenn die minimale Tiefe Tmin der Leitschaufeln in einem Bereich zwischen 50% und 85% der Länge L der Leitschaufeln, besonders bevorzugt aber in einem Bereich zwischen 60% und 80%, der Länge der Leitschaufeln liegt. Dabei ist die Gesamtlänge L der Leitschaufeln 5 nach der Formel
Bei ausgeführten erfindungsgemäßen Nachleitapparaten haben sich folgende Werte für minimale Tiefe Tmin der Leitschaufeln 5 als optimal erwiesen:
Die konkrete Gestaltung der konkaven Krümmung der Eintrittskante 11 hängt naturgemäß von den Abmessungen des Leitapparats, der Beschaufelung des nicht dargestellten Axiallüfters sowie der Lage des optimalen Wirkungsgrades in der Kennlinie ab. Auch können die stromabwärts gelegenen Bauteile, wie ein Diffusor oder ein Gehäuse eines Drehlüfters, Einfluss auf das Strömungsverhalten des erfindungsgemäßen Leitapparats 1 haben. Daher ist es nicht möglich, im Sinne einer einfachen Formel die Geometrie die Krümmung der Eintrittskante 11 der erfindungsgemäßen Leitschaufeln 5 anzugeben. Es ist vielmehr eine Kombination aus Messungen und Simulationsrechnungen erforderlich, um für konkrete Axiallüfter die optimale Gestaltung der Eintrittskante 11 zu ermitteln.The concrete design of the concave curvature of the leading
In guter Näherung kann der Verlauf des gekrümmten Teils der Eintrittskante 11 in der Ansicht von vorne (
In
Aus der
In
Die Strömungsrichtung der Luft ist wiederum durch Pfeile 15 angedeutet. Der Drehlüfter 17 umfasst einen Axiallüfter 19, einen erfindungsgemäßen Leitapparat 1 und ein Gehäuse 21. In dem Axiallüfter 19 ist ein Laufrad 23 angeordnet, das durch eine Antriebswelle 25 in Drehung versetzt wird. Der Axiallüfter 19 kann ein herkömmlicher Axiallüfter sein. Bei dem in
Das Gehäuse 21 des Drehlüfters ist kegelstumpfförmig ausgebildet und weist mehrere Leitbleche 27 auf. Aus Gründen der Übersichtlichkeit sind nicht alle Leitbleche mit Bezugszeichen versehen.The
Die Leitbleche 27 bewirken, dass die von dem Axiallüfter 19 bzw. dessen Laufrad 23 geförderte Luft horizontal ausgeblasen wird. Das Gehäuse 21 ist in seinem in
Das Lager ist in
The warehouse is in
Auch bei dem in
In
- ψtot: Druckzahl total
- ψfa: Druckzahl frei ausblasend / statisch
- ψ dead : total pressure
- ψ fa : pressure freely blowing / static
Dabei ist die Kennlinie eines mit einem erfindungsgemäßen Nachleitapparat 1 ausgerüsteten Axiallüfters als durchgezogene Linie dargestellt, während die Kennlinie eines mit einem herkömmlichen Nachleitapparat 1 ausgerüsteten Axiallüfters als gestrichelt Linie dargestellt ist.In this case, the characteristic of an axial fan equipped with a
In
- ηtot: Wirkungsgrad total
- ηfa: Wirkungsgrad frei ausblasend / statisch
- η dead : total efficiency
- η fa : Efficiency free blowing / static
Auch in
Die Druckzahl ψtot und der Wirkungsgrad ηtot sind auf die gesamte Rohraustrittsfläche bezogen und wurden mit einem druckseitigen Ausgleichsrohr mit einer Länge von 2 x Rohrdurchmesser ermittelt.The pressure factor ψ tot and the efficiency η 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.
Die Durchflusszahl ϕ wurde nach folgender Gleichung bestimmt:
Die Druckzahl ψ wurde nach folgender Gleichung bestimmt:
Mit:
- V°: Volumenstrom [m3/s]
- Δp: Druckerhöhung [Pa]
- ρ: Dichte [kg/m3]
- D: Schaufelraddurchmesser [m]
- n: Drehzahl [1/s]
- V °: volumetric flow [m 3 / s]
- Δp: pressure increase [Pa]
- ρ: density [kg / m 3 ]
- D: paddle wheel diameter [m]
- n: speed [1 / s]
Aus dem Vergleich der in
Claims (10)
- A rotary fan comprising an axial fan (19), a guide apparatus (1) downstream of the axial fan (19), and a rotatably supported housing (21), in which at least one air outlet opening (27) is provided on the housing (21), characterized in that the guide apparatus (1) includes a plurality of substantially radially disposed guide vanes (5); that the guide apparatus (1) is disposed downstream in the flow direction of an impeller (23) of the axial fan (19); that the guide vanes (5) have an inlet edge (11) and an outlet edge (13); that the inlet edges (11) are curved; and that the drive of the impeller (23) is effected by means of a drive shaft (25) disposed upstream in the flow direction of the impeller (23).
- The rotary fan according to claim 1, characterized in that a depth (T) of the guide vanes (5) varies continuously over a length (L) of the guide vanes (5).
- The rotary fan according to claim 1 or 2, characterized in that a depth (T) of the guide vanes (5) has a minimum (Tmin) in a range of between 50% and 85%, and especially preferably in a range between 60% and 80%, of the length (L) of the guide vanes (5).
- The rotary fan according to one of the foregoing claims, characterized in that the inlet edge (11) of the guide vanes (5) is concavely curved.
- The rotary fan according to one of the foregoing claims, characterized in that in at least some regions, in a view from the front, the inlet edge (11) can be approximated to a polynomial second-order curve, in particular a parabola, a hyperbola, and/or an ellipse.
- The rotary fan according to claim 5, characterized in that in at least some regions, in a view from the front, the inlet edge (11) is approximated, by a parabola; and that at the vertex (S) of the parabolic region of the inlet edge (11), a depth (T) of the guide vanes (5) is minimal (T = Tmin).
- The rotary fan according to claim 5 or 6, characterized in that in least some regions, in a view from the front, the inlet edge (11) is approximated by a parabola; and that a vertex tangent (ST) and a radius (R) form an angle (ß) to the vertex (S) of the parabolic region of the inlet edge (11) of between 0° and 10°.
- The rotary fan according to one of the foregoing claims, characterized in that the number of guide vanes (5), as a function of the outer diameter (Da), is in a range which is calculated by the following equation:
in which:c = constant for the particular type of impellerDa = outer diameter of guide apparatusL = total length of guide apparatus. - The rotary fan according to one of the foregoing claims, characterized in that the axial fan (19) has a hub ratio (Di/Da) of 0.3 or greater, and especially preferably of 0.315 or 0.35.
- The rotary fan according to one of the foregoing claims, characterized in that the housing (21) is embodied frustoconically.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007025696A DE102007025696A1 (en) | 2007-06-01 | 2007-06-01 | Axial fan with downstream diffuser |
Publications (4)
Publication Number | Publication Date |
---|---|
EP1998052A2 EP1998052A2 (en) | 2008-12-03 |
EP1998052A3 EP1998052A3 (en) | 2009-10-28 |
EP1998052B1 EP1998052B1 (en) | 2012-08-15 |
EP1998052B9 true EP1998052B9 (en) | 2013-02-27 |
Family
ID=39590331
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08006197A Not-in-force EP1998052B9 (en) | 2007-06-01 | 2008-03-29 | Axial ventilator with subsequent guide vane apparatus |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1998052B9 (en) |
DE (1) | DE102007025696A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010051760A1 (en) | 2010-11-17 | 2012-05-24 | Evg Lufttechnik Gmbh | Axial fan with upstream connection hood and a downstream diffuser |
DE102010051759A1 (en) | 2010-11-17 | 2012-05-24 | Evg Lufttechnik Gmbh | Axial fan with downstream diffuser and a device for equalizing the flow velocity |
DE102019110934A1 (en) * | 2019-04-29 | 2020-10-29 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Guide device for an axial fan |
DE102019134796B4 (en) * | 2019-12-17 | 2023-02-02 | Langmatz Gmbh | distribution cabinet |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE607134C (en) * | 1932-10-26 | 1934-12-18 | Paul Havard | Guide vanes for screw fans |
SE461112B (en) | 1988-06-08 | 1990-01-08 | Flaekt Ab | LED LIGHT SHOWS AN AXIAL FLAT |
US6142733A (en) * | 1998-12-30 | 2000-11-07 | Valeo Thermique Moteur | Stator for fan |
EP1600640A3 (en) * | 2004-04-26 | 2009-11-04 | Behr GmbH & Co. KG | Fan shroud for a heat exchanger, in particular for vehicles. |
-
2007
- 2007-06-01 DE DE102007025696A patent/DE102007025696A1/en not_active Ceased
-
2008
- 2008-03-29 EP EP08006197A patent/EP1998052B9/en not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
EP1998052A3 (en) | 2009-10-28 |
DE102007025696A1 (en) | 2008-12-04 |
EP1998052A2 (en) | 2008-12-03 |
EP1998052B1 (en) | 2012-08-15 |
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