EP2930372A1 - Drum impeller with balancing pockets - Google Patents
Drum impeller with balancing pockets Download PDFInfo
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- EP2930372A1 EP2930372A1 EP15161266.0A EP15161266A EP2930372A1 EP 2930372 A1 EP2930372 A1 EP 2930372A1 EP 15161266 A EP15161266 A EP 15161266A EP 2930372 A1 EP2930372 A1 EP 2930372A1
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- European Patent Office
- Prior art keywords
- balancing
- bulge
- rotor wheel
- drum rotor
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- 238000000926 separation method Methods 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000035508 accumulation Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/027—Arrangements for balancing
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- 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
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
- F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
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- 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
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
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- 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
- F04D29/662—Balancing of rotors
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- 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
- F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
- F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
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- 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
- F05D2240/00—Components
- F05D2240/20—Rotors
- F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D2240/306—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the suction side of a rotor blade
Definitions
- the invention relates to a drum rotor wheel for a fan.
- Tumbler fans are radial flow machines with a rotor wheel having numerous short, forwardly curved blades. Due to the forward curved blading drum runners reach in terms of producible flow velocity and pressure increase in the flow medium desired operating points at significantly lower speeds than radial fan with backward curved blading, which is desired, for example, when used in air conditioning. The forward curvature causes a high energy transfer from the fan to the delivery fluid. Drum runners are used with a housing that converts the high kinetic energy into pressure energy. The flow enters axially into the fan, is accelerated and leaves the housing radially.
- the forward curvature of the blades is characterized by a strong flow deflection, wherein the flow can not follow the blade curvature in most cases and peels or flows back.
- the detachment bladder on the suction side of the blade thereby represents a loss area.
- the efficiency of such drum rotor fans is therefore relatively low. Nevertheless, the high power density and therefore the low installation space required has led to a widespread use in the field of heating, air conditioning and ventilation technology.
- Rotor impellers for blowers and fans usually need to be balanced for practical use to ensure smooth, low-vibration running.
- balancing weights are arranged above all on the outer periphery.
- a radial impeller arrangement with a backward curved radial impeller wheel with a circular bottom disk and circular cover disc with Einpressronde on at least one of the two discs in the disc edge area to attach at least one balance weight.
- the impeller can build larger by the balance weight.
- a two-piece balancing weight can be used, which has a spring clip and an additional weight, wherein the spring clip has a holding portion for attachment to the impeller and a receiving portion for holding the additional weight.
- Such balancing weights must be laboriously assembled. In particular, it is customary to mount balancing weights manually.
- the present invention is therefore based on the object to provide a Drummellellerrad that is easily balanced and automatically ausuchtbar is also manually balanced, the efficiency of the Trommelelerierrads should not be degraded.
- An inventive drum rotor wheel has numerous short, forwardly curved blades.
- the blades have a suction side and a pressure side.
- a cover plate and a bottom plate are provided at the Trommelrellerrad.
- At least one blade of the drum rotor wheel has a bulge on its suction side. The bulge minimizes the area of flow separation, thereby also minimizing the amount of flow separation. In other words, the efficiency of the Trommelelpitrrads is increased by the bulge.
- the bulge is connected to the bottom plate.
- the stability of the blade provided with the bulge is positively influenced by the enlarged connection via the bulge to the bottom plate and the efficiency of the Trommeleltechnikrrads not deteriorated.
- the bulge is completely provided in the field of flow separation. If the bulge lies only in the region of the flow separation, but substantially completely fills it, the vortex formation is almost completely prevented and the efficiency of the drum rotor wheel is optimized. On the other hand, the maximum cross section for the flow between the blades is available, whereby the flow resistance is minimized and the efficiency of the Trommeleltechnikrrads is further optimized.
- the balancing bag is designed in a hollow shape for receiving a balancing weight. Characterized in that the balancing pocket extends into the bottom plate and is guided through it, it has an opening in the bottom plate through which a balancing weight can be spent in the balancing bag. In particular, it is possible in an open design of the balancing pocket to automatically spend a balance weight in the balancing bag.
- the balancing bag can be designed so that a rectangular plug-in weight for balancing can be pressed into the balancing pocket in a form-fitting manner.
- Tumbler wheels are usually made of plastics, especially thermoplastics and mainly by injection molding.
- Tumbler wheels are usually made of plastics, especially thermoplastics and mainly by injection molding.
- the problem arises that sinking points and / or voids occur due to the shrinkage of the plastic during the cooling, which weaken the mechanical stability of the molding and can result in a contour change.
- the shape of the bulge may deviate from the intended shape, which again dead water areas can occur in the flow during operation, which can reduce the efficiency of the Trommelzustäuferrads.
- This risk is significantly reduced.
- material is saved.
- the bulge in the axial direction x is made shorter than the axial extent of the blade.
- the balancing pocket extends into the cover disk.
- the bulge extends over the entire height of the blade.
- a correspondingly increased balance weight can be spent, whereby the balancing effect can be increased.
- the balancing pocket is guided through the cover disk.
- an opening of the balancing pocket is achieved in the cover plate, whereby a balancing weight can be brought into the balancing pocket.
- this embodiment provides an additional feeding possibility for a balancing weight, which is advantageous in the case of an automated balancing of the feed through the bottom disk, since the flexibility of the supply of a balancing weight is increased. If, for example, due to geometric conditions on the balancing machine, no balancing weight can be supplied through the bottom disk, in this embodiment the balancing weight can alternatively be introduced through the cover disk.
- all blades have a bulge. This minimizes flow separation on all blades, further increasing the efficiency of the entire drum rotor wheel.
- the balancing quality can be increased since the location of a balancing weight required for optimal balancing can be more accurately determined.
- the cover disc has an additional ring on its outer side, wherein the inner contour of the additional ring has a radius-shaped region.
- the radius-shaped area on the inner contour of the ring allows a guided deflection of the flow and further minimizes the flow losses, whereby the efficiency of the Trommeleltechnikrrads is further increased.
- the additional ring has at least one second balancing pocket.
- a second level is still obtained for the balance, whereby the balancing quality is improved.
- Fig. 1 shows a flow pattern on a Trommelellibraryrrad 10 according to the prior art.
- the blades 20 are curved forward with great curvature.
- the flow can not follow the high curvature and dissolves on the suction side 21 of the blades 20, creating an area 25 of flow separation, which causes vortex formation in this area 25, causing losses due to dissipation.
- Fig. 2 shows a drum pulley 10 according to the invention in a three-dimensional view from the perspective of the cover plate 30.
- the drum rotor 10 has numerous short, forward curved blades 20.
- the blades 20 have a suction side 21 and a pressure side 22.
- the blades 20 of the Drummelêtrrads 10 have on their suction side 21 bulges 23.
- the area 25 in Fig. 1 minimizes flow separation on each blade 20, thereby also minimizing the amount of total flow separation.
- the bulges 23 are connected to the bottom plate 40 and made shorter in the axial direction x than the axial extent of the blade 20 itself.
- the cover plate 30 has an additional ring 31.
- This additional ring 31 has second balancing pockets 33.
- Fig. 3 shows a drum rotor 10 according to the invention in a three-dimensional representation from the perspective of the bottom plate 40.
- the drum rotor 10 is made for example of a thermoplastic material by injection molding.
- the bulge 23 (in Fig. 3 not visible) on the blades 20 of the Drummel culminrrads 10 have balancing pockets 24 which extend into the bottom plate 40 into and are guided therethrough.
- the balancing pockets 24 are hollow shaped, so that they can take balancing weights. Characterized in that the balancing pockets 24 extend into the bottom plate 40 and are guided through them, they have openings 41 in the bottom plate 40, can be spent by the balancing weights in the balancing pockets 24.
- Fig. 4 shows the Drummell 10 in longitudinal section.
- the cover plate 30 has an additional ring 31.
- This additional ring 31 has a second balancing pocket 33.
- the second balancing pockets 33 in the additional ring 31 is still a second level for the balance obtained the balancing quality can be improved.
- the additional ring 31 has below the second balancing pocket 33 in the opposite x-direction an annular material cut with a radius-shaped region 32.
- Fig. 5 shows the section C - C through the bulges 23 of the blades 20 on the bottom plate 40 of a Trommeleltechnikrrads 10.
- the bulges 23 have substantially a contour, that of the area 25 of the flow separation from Fig. 1 equivalent.
- the balancing pockets 24 have, for example, a rectangular cross section, so that suitable rectangular balancing weights can be pressed into the balancing pockets 24 in a form-fitting manner. Other balancing pocket and balancing weights geometries are also possible.
- Fig. 6 shows a flow pattern on a drum rotor 10 according to the invention.
- the bulge 23 is completely provided in the region 25 of the flow separation. If the bulge 23 is only in the region 25 of the flow separation, but substantially completely fills it, the vortex formation is almost completely prevented, as can be seen from the vortex arrows, and the efficiency of the Trommeleltechnikrrads 10 is optimized.
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
Die Erfindung betrifft ein Trommelläuferrad für einen Lüfter mit Auswölbungen zur Aufnahme von Wuchtgewichten. Ein erfindungsgemäßes Trommelläuferrad weist mehrere, vorwärts gekrümmte Schaufeln auf. Die Schaufeln haben eine Saugseite und eine Druckseite. An dem Trommelläuferrad sind eine Deckscheibe und eine Bodenscheibe vorgesehen. Zumindest eine Schaufel des Trommelläuferrads weist ihrer Saugseite eine Auswölbung auf, die ihrerseits eine Wuchttasche aufweist. Durch die Auswölbung wird das Gebiet der Strömungsablösung minimiert, wodurch das Ausmaß der Strömungsablösung ebenfalls minimiert wird. Mit anderen Worten wird durch die Auswölbung der Wirkungsgrad des Trommelläuferrads erhöht.The invention relates to a drum rotor wheel for a fan with bulges for receiving balancing weights. An inventive drum rotor wheel has a plurality of forwardly curved blades. The blades have a suction side and a pressure side. At the Trommelrellerrad a cover plate and a bottom plate are provided. At least one blade of the drum rotor wheel has its suction side a bulge, which in turn has a balancing pocket. The bulge minimizes the area of flow separation, thereby also minimizing the amount of flow separation. In other words, the efficiency of the Trommelelläuferrads is increased by the bulge.
Description
Die Erfindung betrifft ein Trommelläuferrad für einen Lüfter.The invention relates to a drum rotor wheel for a fan.
Trommelläufer-Lüfter sind radiale Strömungsmaschinen mit einem Läuferrad, das zahlreiche kurze, vorwärts gekrümmte Schaufeln aufweist. Durch die vorwärtsgekrümmte Beschaufelung erreichen Trommelläufer hinsichtlich erzeugbarer Strömungsgeschwindigkeit und Druckerhöhung im Strömungsmedium gewünschte Betriebspunkte bei deutlich niedrigeren Drehzahlen als Radiallüfter mit rückwärtsgekrümmter Beschaufelung, was beispielsweise bei der Verwendung in Klimaanlagen gewünscht ist. Die Vorwärtskrümmung bewirkt einen hohen Energietransfer vom Lüfter auf das Förderfluid. Trommelläufer werden mit einem Gehäuse verwendet, welches die hohe kinetische Energie in Druckenergie umwandelt. Die Strömung tritt axial in den Lüfter ein, wird beschleunigt und verlässt radial das Gehäuse. Die Vorwärtskrümmung der Schaufeln ist geprägt von einer starken Strömungsumlenkung, wobei die Strömung in den meisten Fällen der Schaufelkrümmung nicht folgen kann und ablöst beziehungsweise rückströmt. Die Ablöseblase auf der Saugseite der Schaufel stellt dabei ein Verlustgebiet dar. Der Wirkungsgrad solcher Trommelläufer-Lüfter ist daher relativ niedrig. Dennoch hat die hohe Leistungsdichte und der daher benötigte geringe Bauraum zu einer starken Verbreitung im Bereich der Heizungs-, Klima- und Lüftungstechnik geführt.Tumbler fans are radial flow machines with a rotor wheel having numerous short, forwardly curved blades. Due to the forward curved blading drum runners reach in terms of producible flow velocity and pressure increase in the flow medium desired operating points at significantly lower speeds than radial fan with backward curved blading, which is desired, for example, when used in air conditioning. The forward curvature causes a high energy transfer from the fan to the delivery fluid. Drum runners are used with a housing that converts the high kinetic energy into pressure energy. The flow enters axially into the fan, is accelerated and leaves the housing radially. The forward curvature of the blades is characterized by a strong flow deflection, wherein the flow can not follow the blade curvature in most cases and peels or flows back. The detachment bladder on the suction side of the blade thereby represents a loss area. The efficiency of such drum rotor fans is therefore relatively low. Nevertheless, the high power density and therefore the low installation space required has led to a widespread use in the field of heating, air conditioning and ventilation technology.
Läuferräder für Gebläse und Lüfter müssen in aller Regel für den praktischen Einsatz ausgewuchtet werden, um einen ruhigen, schwingungsarmen Lauf zu gewährleisten. Dazu werden vor allem an der äußeren Peripherie Wuchtgewichte angeordnet.Rotor impellers for blowers and fans usually need to be balanced for practical use to ensure smooth, low-vibration running. For this purpose, balancing weights are arranged above all on the outer periphery.
Beispielsweise ist es möglich, an einer Radial-Läuferrad-Anordnung mit einem rückwärts gekrümmten Radialläuferrad mit kreisförmiger Bodenscheibe und kreisförmiger Deckscheibe mit Einpressronde auf mindestens einer der beiden Scheiben im Scheibenrandbereich mindestens ein Ausgleichgewicht zu befestigen. Dabei kann das Läuferrad durch das Ausgleichsgewicht größer bauen. Beispielsweise kann ein zweiteiliges Wuchtgewicht verwendet werden, das eine Federklammer und ein Zusatzgewicht aufweist, wobei die Federklammer einen Halteabschnitt zum Befestigen an dem Laufrad und einen Aufnahmeabschnitt zur Halterung des Zusatzgewichtes aufweist. Solche Wuchtgewichte müssen aufwändig montiert werden. Insbesondere ist es üblich, Wuchtgewichte manuell zu montieren.For example, it is possible on a radial impeller arrangement with a backward curved radial impeller wheel with a circular bottom disk and circular cover disc with Einpressronde on at least one of the two discs in the disc edge area to attach at least one balance weight. The impeller can build larger by the balance weight. For example, a two-piece balancing weight can be used, which has a spring clip and an additional weight, wherein the spring clip has a holding portion for attachment to the impeller and a receiving portion for holding the additional weight. Such balancing weights must be laboriously assembled. In particular, it is customary to mount balancing weights manually.
Der vorliegenden Erfindung liegt daher die Aufgabe zu Grunde, ein Trommelläuferrad anzugeben, das auf einfache Weise automatisiert auswuchtbar ist als auch manuell auswuchtbar ist, wobei der Wirkungsgrad des Trommelläuferrads nicht verschlechtert werden soll.The present invention is therefore based on the object to provide a Drummellellerrad that is easily balanced and automatically ausuchtbar is also manually balanced, the efficiency of the Trommelelläuferrads should not be degraded.
Erfindungsgemäß wird diese Aufgabe durch ein Trommelläuferrad mit den Merkmalen des unabhängigen Anspruches 1 gelöst. Vorteilhafte Weiterbildungen des Trommelläuferrads ergeben sich aus den Unteransprüchen 2 - 9.According to the invention, this object is achieved by a drum rotor wheel having the features of independent claim 1. Advantageous developments of the Drummelläuferrads emerge from the dependent claims 2-9.
Ein erfindungsgemäßes Trommelläuferrad weist zahlreiche kurze, vorwärts gekrümmte Schaufeln auf. Die Schaufeln haben eine Saugseite und eine Druckseite. An dem Trommelläuferrad sind eine Deckscheibe und eine Bodenscheibe vorgesehen. Zumindest eine Schaufel des Trommelläuferrads weist auf ihrer Saugseite eine Auswölbung auf. Durch die Auswölbung wird das Gebiet der Strömungsablösung minimiert, wodurch das Ausmaß der Strömungsablösung ebenfalls minimiert wird. Mit anderen Worten wird durch die Auswölbung der Wirkungsgrad des Trommelläuferrads erhöht.An inventive drum rotor wheel has numerous short, forwardly curved blades. The blades have a suction side and a pressure side. At the Trommelrellerrad a cover plate and a bottom plate are provided. At least one blade of the drum rotor wheel has a bulge on its suction side. The bulge minimizes the area of flow separation, thereby also minimizing the amount of flow separation. In other words, the efficiency of the Trommelelläuferrads is increased by the bulge.
Die Auswölbung ist mit der Bodenscheibe verbunden. Dadurch wird die Stabilität der mit der Auswölbung versehenen Schaufel durch die über die Auswölbung vergrößerte Anbindung an die Bodenscheibe positiv beeinflusst und der Wirkungsgrad des Trommelläuferrads nicht verschlechtert.The bulge is connected to the bottom plate. As a result, the stability of the blade provided with the bulge is positively influenced by the enlarged connection via the bulge to the bottom plate and the efficiency of the Trommelelläuferrads not deteriorated.
Weiterhin ist die Auswölbung vollständig im Gebiet der Strömungsablösung vorgesehen. Wenn die Auswölbung nur im Bereich der Strömungsablösung liegt, diesen aber im Wesentlichen vollständig ausfüllt, ist die Wirbelbildung nahezu vollständig verhindert und der Wirkungsgrad des Trommelläuferrads optimiert. Andererseits steht der maximale Querschnitt für die Durchströmung zwischen den Schaufeln zu Verfügung, wodurch der Strömungswiderstand minimiert und der Wirkungsgrad des Trommelläuferrads weiter optimiert wird.Furthermore, the bulge is completely provided in the field of flow separation. If the bulge lies only in the region of the flow separation, but substantially completely fills it, the vortex formation is almost completely prevented and the efficiency of the drum rotor wheel is optimized. On the other hand, the maximum cross section for the flow between the blades is available, whereby the flow resistance is minimized and the efficiency of the Trommelelläuferrads is further optimized.
In einer vorteilhaften Ausführungsform weist die Auswölbung an einer Schaufel des Trommelläuferrads wenigstens eine Wuchttasche auf, die bis in die Bodenscheibe hinein reicht und durch sie hindurch geführt ist. Die Wuchttasche ist hohlförmig zur Aufnahme eines Wuchtgewichts ausgestaltet. Dadurch, dass die Wuchttasche bis in die Bodenscheibe hinein reicht und durch sie hindurch geführt ist, weist sie eine Öffnung in der Bodenscheibe auf, durch die ein Wuchtgewicht in die Wuchttasche verbracht werden kann. Insbesondere ist es bei einer offenen Ausgestaltung der Wuchttasche möglich, ein Wuchtgewicht automatisiert in die Wuchttasche zu verbringen. Beispielsweise kann die Wuchttasche so gestaltet werden, dass ein rechteckiges Steckgewicht zur Auswuchtung formschlüssig in die Wuchttasche einpressbar ist. Eine solche Ausgestaltung eignet sich besonders gut für die automatisierte Auswuchtung von Trommelläuferrädern. Darüber hinaus wird durch die hohle Gestaltung der Auswölbung eine Materialanhäufung minimiert. Trommelläuferräder werden üblicherweise aus Kunststoffen, insbesondere thermoplastischen Kunststoffen und hauptsächlich im Spritzgußverfahren hergestellt. Bei Materialanhäufungen von im Spritzgußverfahren hergestellten Kunststoffteilen tritt das Problem auf, dass durch die Schwindung des Kunststoffs während der Erkaltung Einfallstellen und/oder Lunker auftreten, die die mechanische Stabilität des Formteils schwächen und eine Konturveränderung zur Folge haben können. Durch eine solche Konturveränderung kann die Form der Auswölbung von der vorgesehen Form abweichen, wodurch im Betrieb erneut Totwassergebiete in der Strömung auftreten können, die den Wirkungsgrad des Trommelläuferrads verringern können. Durch das Vorsehen einer Wuchttasche in der Auswölbung wird diese Gefahr deutlich verringert. Darüber hinaus wird Material eingespart.In an advantageous embodiment, the bulge on a blade of the Trommelelläuferrads on at least one balancing pocket, which extends into the bottom plate and is guided through them. The balancing bag is designed in a hollow shape for receiving a balancing weight. Characterized in that the balancing pocket extends into the bottom plate and is guided through it, it has an opening in the bottom plate through which a balancing weight can be spent in the balancing bag. In particular, it is possible in an open design of the balancing pocket to automatically spend a balance weight in the balancing bag. For example, the balancing bag can be designed so that a rectangular plug-in weight for balancing can be pressed into the balancing pocket in a form-fitting manner. Such a configuration is particularly well suited for the automated balancing of drum rotor wheels. In addition, the hollow design of the bulge material accumulation is minimized. Tumbler wheels are usually made of plastics, especially thermoplastics and mainly by injection molding. When material accumulations of injection-molded plastic parts, the problem arises that sinking points and / or voids occur due to the shrinkage of the plastic during the cooling, which weaken the mechanical stability of the molding and can result in a contour change. By such a contour change, the shape of the bulge may deviate from the intended shape, which again dead water areas can occur in the flow during operation, which can reduce the efficiency of the Trommelzustäuferrads. By providing a balancing pocket in the bulge, this risk is significantly reduced. In addition, material is saved.
In einer weiteren Ausführungsform ist die Auswölbung in axialer Richtung x kürzer ausgeführt als die axiale Ausdehnung der Schaufel.In a further embodiment, the bulge in the axial direction x is made shorter than the axial extent of the blade.
In einer alternativen Ausführungsform reicht die Wuchttasche bis in die Deckscheibe hinein. Dabei erstreckt sich die Auswölbung über die gesamte Höhe der Schaufel. In eine derart vergrößerte Wuchttasche lässt sich ein entsprechend vergrößertes Wuchtgewicht verbringen, wodurch der Auswuchteffekt vergrößert werden kann.In an alternative embodiment, the balancing pocket extends into the cover disk. The bulge extends over the entire height of the blade. In such an enlarged balancing pocket, a correspondingly increased balance weight can be spent, whereby the balancing effect can be increased.
In einer vorteilhaften Ausführungsform ist die Wuchttasche durch die Deckscheibe hindurch geführt. Hierdurch wird eine Öffnung der Wuchttasche in der Deckscheibe erreicht, wodurch ein Wuchtgewicht in die Wuchttasche verbringbar ist. Insbesondere eröffnet diese Ausführungsform eine zu der Zuführung durch die Bodenscheibe zusätzliche Zuführungsmöglichkeit für ein Wuchtgewicht, was bei einer automatisierten Wuchtung vorteilhaft ist, da die Flexibilität der Zuführung eines Wuchtgewichts erhöht wird. Kann beispielsweise aus geometrischen Gegebenheiten an der Wuchtmaschine kein Wuchtgewicht durch die Bodenscheibe zugeführt werden, kann in dieser Ausführungsform das Wuchtgewicht alternativ durch die Deckscheibe eingebracht werden.In an advantageous embodiment, the balancing pocket is guided through the cover disk. As a result, an opening of the balancing pocket is achieved in the cover plate, whereby a balancing weight can be brought into the balancing pocket. In particular, this embodiment provides an additional feeding possibility for a balancing weight, which is advantageous in the case of an automated balancing of the feed through the bottom disk, since the flexibility of the supply of a balancing weight is increased. If, for example, due to geometric conditions on the balancing machine, no balancing weight can be supplied through the bottom disk, in this embodiment the balancing weight can alternatively be introduced through the cover disk.
In einer vorteilhaften Ausführungsform weisen alle Schaufeln eine Auswölbung auf. Dadurch wird eine Strömungsablösung an allen Schaufern minimiert, wodurch der Wirkungsgrad des gesamten Trommelläuferrads weiter steigt. Weisen darüber hinaus mehrere Auswölbungen Wuchttaschen auf, lässt sich die Wuchtqualität erhöhen, da der für eine optimale Auswuchtung erforderliche Anbringungsort eines Wuchtgewichts sich genauer treffen lässt.In an advantageous embodiment, all blades have a bulge. This minimizes flow separation on all blades, further increasing the efficiency of the entire drum rotor wheel. In addition, if several bulges have balancing pockets, the balancing quality can be increased since the location of a balancing weight required for optimal balancing can be more accurately determined.
Es hat sich als besonders vorteilhaft erwiesen, wenn die Auswölbung vollständig im Gebiet der Strömungsablösung vorgesehen ist. Der Wirkungsgrad des Trommelläuferrads wird hierdurch weiter erhöht, wobei gleichzeitig ein maximierter Durchströmungsquerschnitt zur Verfügung gestellt wird.It has proven to be particularly advantageous if the bulge is completely provided in the field of flow separation. The efficiency of the Trommelelläuferrads is thereby further increased, while a maximized flow area is provided at the same time.
Eine noch weitere Erhöhung des Wirkungsgrads des Trommelläuferrads lässt sich erreichen, wenn die Auswölbung in radialer Richtung im Wesentlichen der Form des Gebiets der Strömungsablösung entspricht.An even further increase in the efficiency of the Trommelelläuferrads can be achieved if the bulge corresponds in the radial direction substantially the shape of the area of the flow separation.
In einer weiteren vorteilhaften Ausführungsform weist die Deckscheibe einen zusätzlichen Ring auf ihrer Außenseite auf, wobei die Innenkontur des zusätzlichen Rings einen radiusförmigen Bereich aufweist. Der radiusförmige Bereich an der Innenkontur des Rings ermöglicht eine geführte Umlenkung der Strömung und minimiert weiter die Strömungsverluste, wodurch der Wirkungsgrad des Trommelläuferrads weiter erhöht wird.In a further advantageous embodiment, the cover disc has an additional ring on its outer side, wherein the inner contour of the additional ring has a radius-shaped region. The radius-shaped area on the inner contour of the ring allows a guided deflection of the flow and further minimizes the flow losses, whereby the efficiency of the Trommelelläuferrads is further increased.
Es hat sich weiterhin als vorteilhaft erwiesen, wenn der zusätzliche Ring mindestens eine zweite Wuchttasche aufweist. In den Fällen, in denen zu der Gestaltung der Wuchttasche auf der Bodenscheibenseite eine Wuchttaschengestaltung auf der Deckscheibe nicht möglich ist, wird dennoch eine zweite Ebene für die Wuchtung erhalten, wodurch die Wuchtqualität verbesserbar ist.It has also proved to be advantageous if the additional ring has at least one second balancing pocket. In those cases in which a balancing pocket design on the cover plate is not possible to the design of the balancing pocket on the bottom disc side, a second level is still obtained for the balance, whereby the balancing quality is improved.
In einer weiteren vorteilhaften Ausführungsform weist der zusätzliche Ring unterhalb der zweiten Wuchttasche einen ringförmigen Materialausschnitt auf, um durch die Materialreduzierung ein verbessertes Verzugsverhalten zu unterstützen.In a further advantageous embodiment, the additional ring below the second balancing pocket on an annular material cutout to support by the material reduction improved distortion behavior.
Weitere Vorteile, Besonderheiten und zweckmäßige Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Darstellung bevorzugter Ausführungsbeispiele anhand der Abbildungen.Further advantages, features and expedient developments of the invention will become apparent from the dependent claims and the following description of preferred embodiments with reference to the drawings.
Von den Abbildungen zeigt:
- Fig. 1
- Strömungsbild an einem Trommelläuferrad nach dem Stand der Technik
- Fig. 2
- erfindungsgemäßes Trommelläuferrad in dreidimensionaler Darstellung aus Sicht der Deckscheibe
- Fig. 3
- erfindungsgemäßes Trommelläuferrad in dreidimensionaler Darstellung aus Sicht der Bodenscheibe
- Fig. 4
- Erfindungsgemäßes Trommelläuferrad im Längsschnitt
- Fig. 5
- Schnitt C-C durch die Auswölbungen der Schaufeln an der Bodenscheibe des erfindungsgemäßen Trommelläuferrads
- Fig. 6
- Wirbelbild an einem erfindungsgemäßen Trommelläuferrad
- Fig. 1
- Flow pattern on a Trommelelläuferrad according to the prior art
- Fig. 2
- Invention Drummellellerrad in three-dimensional representation from the perspective of the cover plate
- Fig. 3
- Drum rotor wheel according to the invention in three-dimensional representation from the perspective of the bottom disk
- Fig. 4
- Inventive Trommelrollerrad in longitudinal section
- Fig. 5
- Section CC through the bulges of the blades on the bottom plate of the drum rotor according to the invention
- Fig. 6
- Vortex image on a drum rotor wheel according to the invention
Die Deckscheibe 30 weist einen zusätzlichen Ring 31 auf. Dieser zusätzliche Ring 31 weist zweite Wuchttaschen 33 auf.The
Der Einsatz unterschiedlicher Materialien für die Schaufeln 20 ist in den
Die hier gezeigten Ausführungsformen stellen nur Beispiele für die vorliegende Erfindung dar und dürfen daher nicht einschränkend verstanden werden. Alternative durch den Fachmann in Erwägung gezogene Ausführungsformen sind gleichermaßen vom Schutzbereich der vorliegenden Erfindung umfasst.The embodiments shown herein are only examples of the present invention and therefore should not be considered as limiting. Alternative embodiments contemplated by one skilled in the art are equally within the scope of the present invention.
- 1010
- TrommelläuferradTrommelläuferrad
- 2020
- Schaufelshovel
- 2121
- Saugseitesuction
- 2222
- Druckseitepressure side
- 2323
- Auswölbungbulge
- 2424
- Wuchttaschebalancing pocket
- 2525
- Gebiet der StrömungsablösungField of flow separation
- 3030
- Deckscheibecover disc
- 3131
- Ringring
- 3232
- radiusförmiger Bereichradius-shaped area
- 3333
- zweite Wuchttaschesecond balancing bag
- 4040
- Bodenscheibebottom disk
- 4141
- Öffnungopening
- xx
- axiale Richtungaxial direction
Claims (9)
dadurch gekennzeichnet,
dass das Trommelläuferrad (10) zumindest eine Schaufel (20) aufweist, die auf ihrer Saugseite (21) eine Auswölbung (23) aufweist, wobei die Auswölbung (23) mit der Bodenscheibe (40) verbunden ist und die Auswölbung (23) vollständig im Gebiet der Strömungsablösung (25) vorgesehen ist und die Auswölbung (23) weiterhin eine Wuchttasche (24) aufweist, die bis in die Bodenscheibe (40) hinein reicht und durch sie hindurch geführt istDrum rotor wheel (10) comprising a plurality of short, forwardly curved blades (20), the blades (20) having a suction side (21) and a pressure side (22), a cover disk (30) and a bottom disk (40),
characterized,
in that the drum rotor wheel (10) has at least one blade (20) which has a bulge (23) on its suction side (21), the bulge (23) being connected to the bottom disk (40) and the bulge (23) being completely in Flow separation (25) is provided and the bulge (23) further comprises a balancing pocket (24) which extends into the bottom plate (40) into and is guided therethrough
dadurch gekennzeichnet,
dass die Auswölbung (23) in axialer Richtung x kürzer ausgeführt ist als die axiale Ausdehnung der Schaufel (20).Drum rotor wheel (10) according to claim 1,
characterized,
that the bulge (23) is performed x is shorter in axial direction than the axial extent of the blade (20).
dadurch gekennzeichnet,
dass die Wuchttasche (24) bis in die Deckscheibe (30) hinein reicht.Drum rotor wheel (10) according to claim 1,
characterized,
that the balancing pocket (24) extends into the cover disk (30).
dadurch gekennzeichnet,
dass die Wuchttasche (24) durch die Deckscheibe (30) hindurch geführt ist.Drum rotor wheel (10) according to claim 3,
characterized,
in that the balancing pocket (24) is guided through the cover disk (30).
dadurch gekennzeichnet,
dass alle Schaufeln (20) eine Auswölbung (23) aufweisen.Drum rotor wheel (10) according to one of the preceding claims,
characterized,
that all blades (20) have a bulge (23).
dadurch gekennzeichnet,
dass die Auswölbung (23) in radialer Richtung im Wesentlichen der Form des Gebiets der Strömungsablösung (25) entspricht.Drum rotor wheel (10) according to one of the preceding claims,
characterized,
that the bulge (23) in the radial direction substantially corresponds to the shape of the area of the flow separation (25).
dadurch gekennzeichnet,
dass die Deckscheibe (30) einen zusätzlichen Ring (31) auf ihrer Außenseite aufweist, wobei die Innenkontur des zusätzlichen Rings (31) einen radiusförmigen Bereich (32) aufweist.Drum rotor wheel (10) according to one of the preceding claims,
characterized,
that the cover plate (30) comprises an additional ring (31) on its outer side, wherein the inner contour of the additional ring (31) has a radius-shaped area (32).
dadurch gekennzeichnet,
dass der zusätzliche Ring (31) mindestens eine zweite Wuchttasche (33) aufweist.Drum rotor wheel (10) according to claim 7,
characterized,
that the additional ring (31) has at least one second balancing pocket (33).
dadurch gekennzeichnet,
dass der zusätzliche Ring (31) unterhalb der zweiten Wuchttasche (33) in entgegengesetzter x-Richtung einen ringförmigen Materialschnitt aufweist.Drum rotor wheel (10) according to claim 8,
characterized,
that the additional ring (31) in the opposite x-direction comprises an annular material section below the second force pocket (33).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI201530134T SI2930372T1 (en) | 2014-04-11 | 2015-03-27 | Drum impeller with balancing pockets |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014207059 | 2014-04-11 | ||
DE102014208372.9A DE102014208372A1 (en) | 2014-04-11 | 2014-05-05 | balancing bags |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2930372A1 true EP2930372A1 (en) | 2015-10-14 |
EP2930372B1 EP2930372B1 (en) | 2017-09-27 |
Family
ID=53058897
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15161266.0A Active EP2930372B1 (en) | 2014-04-11 | 2015-03-27 | Drum impeller with balancing pockets |
Country Status (7)
Country | Link |
---|---|
US (1) | US9909423B2 (en) |
EP (1) | EP2930372B1 (en) |
CN (2) | CN204828033U (en) |
DE (2) | DE102014208372A1 (en) |
ES (1) | ES2653529T3 (en) |
HU (1) | HUE037743T2 (en) |
SI (1) | SI2930372T1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD771235S1 (en) * | 2014-04-11 | 2016-11-08 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Fan drum rotor |
US11105203B2 (en) | 2018-01-29 | 2021-08-31 | Carrier Corporation | High efficiency centrifugal impeller with balancing weights |
TWI681127B (en) * | 2018-02-01 | 2020-01-01 | 大陸商佛山市建準電子有限公司 | Centrifugal fan and impeller thereof |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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DE202009006872U1 (en) * | 2008-05-27 | 2009-10-29 | Ebm-Papst St. Georgen Gmbh & Co. Kg | radial fans |
DE102009032411A1 (en) * | 2008-07-25 | 2010-02-04 | Denso Corporation, Kariya-City | Centrifugal multi-blade blower |
DE102011000208A1 (en) * | 2011-01-19 | 2012-07-19 | Minebea Co., Ltd. | Blade wheel for fan i.e. radial fan, has hub for connecting wheel with drive motor, fan blades arranged around hub, and pockets provided for inserting balancing weights and arranged partially in all fan blades or in selected fan blades |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS5331206A (en) * | 1976-09-06 | 1978-03-24 | Hitachi Ltd | Fan with forward blades |
DE4136293B4 (en) * | 1990-11-03 | 2004-08-26 | Papst Licensing Gmbh & Co. Kg | Impeller for a blower, especially a radial blower |
US6042335A (en) * | 1998-05-04 | 2000-03-28 | Carrier Corporation | Centrifugal flow fan and fan/orifice assembly |
JP2006077723A (en) * | 2004-09-13 | 2006-03-23 | Matsushita Electric Ind Co Ltd | Multi-blade fan |
EP1902220B1 (en) * | 2005-07-04 | 2012-09-12 | Behr GmbH & Co. KG | Blower wheel |
US8167562B2 (en) * | 2007-06-29 | 2012-05-01 | Denso Corporation | Centrifugal fan and blower having the same |
JP5634782B2 (en) * | 2009-08-11 | 2014-12-03 | 山洋電気株式会社 | Centrifugal fan |
JP5287772B2 (en) * | 2010-03-16 | 2013-09-11 | 株式会社デンソー | Centrifugal multi-blade fan |
DE202012103554U1 (en) * | 2012-09-18 | 2013-12-20 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Impeller with balancing |
-
2014
- 2014-05-05 DE DE102014208372.9A patent/DE102014208372A1/en not_active Withdrawn
-
2015
- 2015-03-09 US US14/642,215 patent/US9909423B2/en active Active
- 2015-03-26 CN CN201520176422.4U patent/CN204828033U/en active Active
- 2015-03-26 CN CN201510137716.0A patent/CN104976151A/en active Pending
- 2015-03-27 EP EP15161266.0A patent/EP2930372B1/en active Active
- 2015-03-27 ES ES15161266.0T patent/ES2653529T3/en active Active
- 2015-03-27 HU HUE15161266A patent/HUE037743T2/en unknown
- 2015-03-27 DE DE202015101563.1U patent/DE202015101563U1/en active Active
- 2015-03-27 SI SI201530134T patent/SI2930372T1/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202009006872U1 (en) * | 2008-05-27 | 2009-10-29 | Ebm-Papst St. Georgen Gmbh & Co. Kg | radial fans |
DE102009032411A1 (en) * | 2008-07-25 | 2010-02-04 | Denso Corporation, Kariya-City | Centrifugal multi-blade blower |
DE102011000208A1 (en) * | 2011-01-19 | 2012-07-19 | Minebea Co., Ltd. | Blade wheel for fan i.e. radial fan, has hub for connecting wheel with drive motor, fan blades arranged around hub, and pockets provided for inserting balancing weights and arranged partially in all fan blades or in selected fan blades |
Also Published As
Publication number | Publication date |
---|---|
DE202015101563U1 (en) | 2015-04-28 |
US20150292331A1 (en) | 2015-10-15 |
HUE037743T2 (en) | 2018-09-28 |
SI2930372T1 (en) | 2018-01-31 |
CN104976151A (en) | 2015-10-14 |
CN204828033U (en) | 2015-12-02 |
EP2930372B1 (en) | 2017-09-27 |
US9909423B2 (en) | 2018-03-06 |
DE102014208372A1 (en) | 2015-10-15 |
ES2653529T3 (en) | 2018-02-07 |
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