EP3334942B1 - Hood with mix axial/radial ventilator - Google Patents

Hood with mix axial/radial ventilator Download PDF

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Publication number
EP3334942B1
EP3334942B1 EP17719544.3A EP17719544A EP3334942B1 EP 3334942 B1 EP3334942 B1 EP 3334942B1 EP 17719544 A EP17719544 A EP 17719544A EP 3334942 B1 EP3334942 B1 EP 3334942B1
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Prior art keywords
cross
axial
extraction device
flow
set forth
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German (de)
French (fr)
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EP3334942A1 (en
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Daniel Gebert
Jens Müller
Oliver Haaf
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Ebm Papst Mulfingen GmbH and Co KG
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Ebm Papst Mulfingen GmbH and Co KG
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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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/06—Helico-centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F04D17/165—Axial entry and discharge
    • 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
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • 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
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F04D29/4253—Fan casings with axial entry and discharge
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes

Definitions

  • the invention relates to an extractor device with an intake area and a flow channel which is connected to the intake area in the direction of flow and has an outlet opening for blowing out the extracted air.
  • the outlet port is usually followed by a pipe that can be routed to an area outside the building.
  • Vapor extraction devices with an intake area, in which grease filters are usually integrated, and a flow channel connected thereto are known from the prior art.
  • the installation space available for the fan is extremely limited due to the flow channel, which is usually narrow for design reasons.
  • the large suction area covers the cooker underneath the extractor hood.
  • the air drawn in via the intake area is channeled into the much narrower flow channel, so that a significant proportion of the flow from the intake area enters the flow channel from the side and is deflected for the first time in an axial direction, ie in the center direction of the exhaust channel.
  • the centrifugal fan draws in air radially from the flow channel and blows it out axially.
  • the air is deflected at right angles for the second time. Any deflection of the air volume flow results in further pressure losses and thus reduced efficiency, since the fan output has to be adjusted.
  • the invention is therefore based on the object of providing an extractor device which, with the same extraction capacity, ensures lower power consumption and optionally reduced noise generation.
  • a fume extraction device with an intake area, a flow channel which is connected to the intake area in the direction of flow and is flow-connected, and an outlet opening proposed, wherein a suction cross-sectional area is larger than a flow channel cross-sectional area and an outlet opening cross-sectional area is smaller than the flow channel cross-sectional area.
  • a diagonal fan with an axial inlet and an axial outlet is arranged in the flow channel, which during operation draws in air axially from the flow channel via the axial inlet and blows it out axially via the axial outlet into the outlet opening flow-connected to the outlet.
  • the use of the diagonal fan in the flow channel advantageously results in a reduction in pressure loss of 40-60% compared to conventionally used radial fans. Deflection losses and power consumption are reduced accordingly. In addition, the generation of noise is reduced, since the flow, once it has entered the flow channel, does not undergo any further change of direction up to the outlet.
  • the advantageous flow control in the vapor extraction device is made possible by the diagonal fan with axial inlet and axial outlet.
  • an outlet cross-sectional area of the diagonal fan corresponds to the outlet opening cross-sectional area.
  • the diagonal fan is mounted with its outlet directly on the outlet opening, in particular, in order to provide a flush transition between the outlet on the fan and the outlet opening on the flow duct.
  • the diagonal fan is often connected directly to a pipe connected to the outlet opening.
  • the intake cross-sectional area is larger than the flow channel cross-sectional area by a factor of 2 to 20, preferably 3 to 10, more preferably 4 to 6.
  • Cross-sectional sizes of the flow channel that are often realized in practice are, for example, 240 mm x 240 mm.
  • outlet openings are usually set to a (pipe) diameter of 150mm.
  • the diagonal fan has a diagonal fan impeller with a surrounding cover plate.
  • the cover disk is arranged on the diagonal fan wheel on the side facing the inlet and covers the otherwise free axial fan blade edges. In a portion facing towards the inlet, the shroud runs parallel to an axial centerline detached from the fan blades.
  • an inlet nozzle which determines the axial inlet and has a flow cross-sectional area that decreases in the axial direction of flow, is arranged on the diagonal fan. It is advantageous to design the inlet nozzle in one piece with the fan housing or to define a part of the fan housing through the inlet nozzle.
  • the inlet nozzle extends in the axial direction into the diagonal fan wheel, so that an axial overlapping area is formed between the diagonal fan wheel and the inlet nozzle.
  • the inlet nozzle is surrounded at least in sections by the cover plate, in particular by the section directed towards the inlet and running parallel to the axial center line.
  • a flow-guiding preliminary guide grille is arranged on the suction side on the inlet nozzle, which contributes in particular to reducing noise emissions and minimizes disruptive low-frequency sounds.
  • the inlet nozzle has a maximum Inlet flow cross-sectional area, which determines a factor of 0.15 - 0.4 of the maximum flow channel cross-sectional area.
  • a guide wheel which determines the axial outlet and has a flow cross-sectional area that increases in the axial direction of flow, is arranged on the diagonal fan.
  • the flow cross-sectional area tapers to the outlet opening cross-sectional area.
  • the guide vane is arranged after the diagonal fan impeller and enables an increase in the axial outflow velocity. It therefore contributes to increasing the efficiency. It is also advantageous to design the guide wheel in one piece with the fan housing or to define a part of the fan housing with the guide wheel.
  • the diagonal fan has a multi-part housing, via which it is fastened to the flow duct.
  • the first part of the housing is formed by the inlet nozzle and the second part by the guide vane.
  • part of the invention is the use of a diagonal fan in an extractor device as described above.
  • the diagonal fan can include individual or all of the features disclosed, insofar as this is technically possible.
  • FIG 1 an extractor hood 200 according to the prior art with a double-flow radial fan 210 is shown schematically by way of example.
  • the air flow generated by the radial fan 210 is shown with arrows S, it being easy to see that the air flow is deflected several times.
  • figure 2 shows a fume extraction device 1 with an intake area 2, a flow-connected flow channel 3 with a square cross-section, which is directly adjacent to the intake area 2 in the direction of flow, and an outlet opening 4, which opens into a pipe 23.
  • the diagonal fan 5 is attached to the wall. The air flow generated by the diagonal fan 5 during operation is represented by the arrows P.
  • the intake area cross-sectional area of the intake area 2 is many times greater than the flow channel cross-sectional area of the flow channel 3, the outlet opening cross-sectional area of the outlet opening 4 is smaller than the flow channel cross-sectional area of the flow channel 3.
  • the diagonal fan 5 has the axial inlet 6 in the direction of the intake area 2, via which during operation Air is sucked in axially from the flow channel 3 and blown out directly into the tube 23 via the axial outlet 7 .
  • the axial outlet 7 is directly connected to the outlet opening 4 and the pipe 23 .
  • the outlet cross-sectional area of the outlet 7 of the diagonal fan 5 corresponds to that of the exhaust port cross-sectional area of the exhaust port 4.
  • the diagonal fan 5 has a structure with a motor 18 which is accommodated and fastened centrally on a motor mount 20 and around which the pressure chamber is routed.
  • the motor 18 drives a diagonal fan wheel 8 arranged upstream, which has a circumferential cover disk 9 which partially covers the axially exposed edges of the diagonal fan wheel blades 19 .
  • the cover disk 9 runs in the inlet section 21 parallel to the axial center line and obliquely outwards in the downstream direction, so that a flow space formed by the cover disk 9 and the base disk 28 merges essentially flush into the pressure space.
  • the axial inlet 6 is formed by the inlet nozzle 10, the flow cross-sectional area of which decreases in the axial direction of flow.
  • the inlet nozzle 10 has an inlet contour 24 which extends in the axial direction into the diagonal fan wheel 8 and forms the axial overlap region 11 with the inlet section 21 of the cover plate 9 .
  • a circumferential radial gap is provided between the inlet contour 24 of the inlet nozzle 10 and the inlet section 21 of the cover disk 9 .
  • the axial distance between the axial edges of the diagonal fan wheel blades 19 and the axial end of the inlet contour 24 of the inlet nozzle 10 is very small and corresponds to 10% of the axial extent of the inlet contour 24 of the inlet nozzle 10.
  • the inlet nozzle 10 forms a maximum inlet flow cross-sectional area which corresponds to 40% of the flow channel cross-sectional area.
  • the inlet nozzle 10 forms a first housing part of the diagonal fan 5.
  • the second housing part which is directly connected and fastened to the first housing part, is provided by the guide vane 12.
  • the guide vane 12 forms the axial outlet 7 and has the shape of the pressure chamber co-determining flow guide elements 22, which extend around the motor 18 to the outlet 7 and thereby in the axial direction of flow Increase flow cross-sectional area to create a venturi effect.
  • the outer housing wall of the guide vane 12 that guides the flow runs parallel to the axial center line.
  • figure 3 shows the lower pressure loss when using the in figure 2 shown diagonal fan 5 in an extractor device 1 compared to the solutions known from the prior art, with graphs 66 and 77 relating to a radial fan and a radial fan installed in an extractor device and graphs 88 and 99 relating to a diagonal fan 5 and a diagonal fan 5 in the refer to Figure 2 installed state.
  • the two graphs 88 and 99 are much closer together, especially at higher volume flows.
  • a flow guide grid can be arranged at the inlet nozzle upstream.
  • the diagonal fan can also be attached to the flow duct only on the axial side and be spaced apart from the flow duct in the radial direction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Extraction Or Liquid Replacement (AREA)

Description

Die Erfindung betrifft eine Dunstabzugsvorrichtung mit einem Ansaugbereich sowie einem sich in Strömungsrichtung an den Ansaugbereich anschließenden und strömungsverbundenen Strömungskanal, der eine Auslassöffnung zum Ausblasen der abgesaugten Luft aufweist. An die Auslassöffnung schließt sich üblicherweise ein Rohr an, das in einen Bereich außerhalb des Gebäudes geführt werden kann.The invention relates to an extractor device with an intake area and a flow channel which is connected to the intake area in the direction of flow and has an outlet opening for blowing out the extracted air. The outlet port is usually followed by a pipe that can be routed to an area outside the building.

Dunstabzugsvorrichtungen mit einem Ansaugbereich, in dem zumeist Fettfilter integriert sind, und einem sich daran anschließenden Strömungskanal sind aus dem Stand der Technik bekannt. Dabei werden zur Ansaugung herkömmlicherweise doppelflutige vorwärts gekrümmte Radialventilatoren eingesetzt.Vapor extraction devices with an intake area, in which grease filters are usually integrated, and a flow channel connected thereto are known from the prior art. Conventionally, double-flow, forward-curved centrifugal fans are used for the intake.

Der Energieverbrauch sowie, je nach Ausführung, die Geräuschbildung der Dunstabzugsvorrichtungen sind bei einem derartigen Aufbau jedoch hoch.However, the energy consumption and, depending on the design, the noise of the fume extraction devices are high with such a structure.

Der für den Ventilator zur Verfügung stehende Einbauraum ist durch den zumeist auch aus designgründen schmalen Strömungskanal äußerst begrenzt. Der großflächige Ansaugbereich überdeckt in der Praxis den unter der Dunstabzugsvorrichtung liegenden Herd. Die über den Ansaugbereich angesaugte Luft wird in den deutlich schmaleren Strömungskanal kanalisiert, so dass ein wesentlicher Anteil der Strömung aus dem Ansaugbereich seitlich in den Strömungskanal eintritt und dabei das erste Mal in eine Axialrichtung, d.h. in Mittenrichtung des Abzugkanals umgelenkt wird. Der Radialventilator saugt Luft radial aus dem Strömungskanal an und bläst sie axial aus. Hierbei wird die Luft zum zweiten Mal im rechten Winkel umgelenkt. Jede Umlenkung des Luftvolumenstromes resultiert in weiteren Druckverlusten und damit einem verringerten Wirkungsgrad, da die Ventilatorleistung angepasst werden muss. Zudem wird aufgrund des beengten Bauraums die Luft strömungstechnisch ungünstig aus radialer Richtung in einem nahe an die Strömungskanalwand angrenzenden Bereich angesaugt. Aufgrund der beengten Platzverhältnisse wird die Luft beim radialen Einsaugen zusätzlich beschleunigt. Durch die am Eingang zum Radialgebläse erfolgte 90°-Umlenkung ergeben sich deutliche Druckverluste. Diesbezüglicher Stand der Technik ist beispielsweise aus der US 5,983,888 bekannt. Ein Ventilator in einem Strömungskanal wird in der CH 213309 offenbart. DE102012019419A1 stellt auch den technischen Hintergrund der Erfindung dar.The installation space available for the fan is extremely limited due to the flow channel, which is usually narrow for design reasons. In practice, the large suction area covers the cooker underneath the extractor hood. The air drawn in via the intake area is channeled into the much narrower flow channel, so that a significant proportion of the flow from the intake area enters the flow channel from the side and is deflected for the first time in an axial direction, ie in the center direction of the exhaust channel. The centrifugal fan draws in air radially from the flow channel and blows it out axially. Here, the air is deflected at right angles for the second time. Any deflection of the air volume flow results in further pressure losses and thus reduced efficiency, since the fan output has to be adjusted. In addition, due to the cramped installation space, the air is sucked in from a radial direction in an area close to the flow channel wall, which is unfavorable in terms of flow technology. Due to the limited space, the air is additionally accelerated during radial suction. The 90° deflection at the inlet to the radial fan results in significant pressure losses. Related prior art is for example from U.S. 5,983,888 known. A fan in a flow channel is in the CH213309 disclosed. DE102012019419A1 also represents the technical background of the invention.

Der Erfindung liegt deshalb die Aufgabe zugrunde, eine Dunstabzugsvorrichtung bereit zu stellen, die bei gleicher Abzugsleistung eine geringere Leistungsaufnahme und optional reduzierte Geräuschbildung gewährleistet. Diese Aufgaben werden durch die Merkmalskombinationen gemäß der Patentansprüche 1 und 13 gelöst.The invention is therefore based on the object of providing an extractor device which, with the same extraction capacity, ensures lower power consumption and optionally reduced noise generation. These objects are solved by the feature combinations according to patent claims 1 and 13.

Erfindungsgemäß wird eine Dunstabzugsvorrichtung mit einem Ansaugbereich, einem sich in Strömungsrichtung an den Ansaugbereich anschließenden und strömungsverbundenen Strömungskanal sowie einer Auslassöffnung vorgeschlagen, wobei eine Ansaugbereichsquerschnittsfläche größer als eine Strömungskanalquerschnittsfläche und eine Auslassöffnungsquerschnittsfläche kleiner als die Strömungskanalquerschnittsfläche ist. In dem Strömungskanal ist ein Diagonalventilator mit einem axialen Einlass und einem axialen Auslass angeordnet, der im Betrieb über den axialen Einlass Luft axial aus dem Strömungskanal ansaugt und axial über den axialen Auslass in die mit dem Auslass strömungsverbundene Auslassöffnung ausbläst.According to the invention, a fume extraction device with an intake area, a flow channel which is connected to the intake area in the direction of flow and is flow-connected, and an outlet opening proposed, wherein a suction cross-sectional area is larger than a flow channel cross-sectional area and an outlet opening cross-sectional area is smaller than the flow channel cross-sectional area. A diagonal fan with an axial inlet and an axial outlet is arranged in the flow channel, which during operation draws in air axially from the flow channel via the axial inlet and blows it out axially via the axial outlet into the outlet opening flow-connected to the outlet.

Aus der Verwendung des Diagonalventilators im Strömungskanal ergibt sich in vorteilhafter Weise eine Reduktion des Druckverlusts gegenüber herkömmlich eingesetzten Radialventilatoren von 40 - 60%. Umlenkverluste sowie die Leistungsaufnahme werden entsprechend verringert. Zudem reduziert sich die Geräuschbildung, da die einmal im Strömungskanal eingetretene Strömung bis zum Auslass keine weitere Richtungsänderung erfährt. Die vorteilhafte Strömungsführung in der Dunstabzugsvorrichtung ist durch den Diagonalventilator mit axialem Einlass und axialem Auslass ermöglicht.The use of the diagonal fan in the flow channel advantageously results in a reduction in pressure loss of 40-60% compared to conventionally used radial fans. Deflection losses and power consumption are reduced accordingly. In addition, the generation of noise is reduced, since the flow, once it has entered the flow channel, does not undergo any further change of direction up to the outlet. The advantageous flow control in the vapor extraction device is made possible by the diagonal fan with axial inlet and axial outlet.

In einer Ausführungsvariante ist vorgesehen, dass eine Auslassquerschnittsfläche des Diagonalventilators der Auslassöffnungsquerschnittsfläche entspricht. Dabei wird der Diagonalventilator mit seinem Auslass insbesondere unmittelbar an der Auslassöffnung montiert, um einen bündigen Übergang zwischen Auslass am Ventilator und Auslassöffnung am Strömungskanal bereit zu stellen. In der Praxis erfolgt der Anschluss des Diagonalventilators häufig unmittelbar an ein an die Auslassöffnung angeschlossenes Rohr.In one embodiment variant it is provided that an outlet cross-sectional area of the diagonal fan corresponds to the outlet opening cross-sectional area. In this case, the diagonal fan is mounted with its outlet directly on the outlet opening, in particular, in order to provide a flush transition between the outlet on the fan and the outlet opening on the flow duct. In practice, the diagonal fan is often connected directly to a pipe connected to the outlet opening.

In einem Ausführungsbeispiel ist die Ansaugquerschnittsfläche um einen Faktor 2 bis 20, bevorzugt 3 bis 10, weiter bevorzugt 4 bis 6 größer als die Strömungskanalquerschnittsfläche. In der Praxis vielfach realisierte Querschnittsgrößen des Strömungskanals liegen z.B. bei 240mm x 240mm. Auslassöffnungen sind in der Praxis meist auf einen (Rohr-)Durchmesser von 150mm festgelegt.In one embodiment, the intake cross-sectional area is larger than the flow channel cross-sectional area by a factor of 2 to 20, preferably 3 to 10, more preferably 4 to 6. Cross-sectional sizes of the flow channel that are often realized in practice are, for example, 240 mm x 240 mm. In practice, outlet openings are usually set to a (pipe) diameter of 150mm.

In einer vorteilhaften Ausführung der Dunstabzugsvorrichtung weist der Diagonalventilator ein Diagonallüfterrad mit umlaufender Deckscheibe auf. Die Deckscheibe wird dabei auf dem Diagonallüfterrad auf der zum Einlass weisenden Seite angeordnet und überdeckt die sonst freien axialen Ventilatorschaufelkanten. In einem zum Einlass gerichteten Abschnitt verläuft die Deckscheibe parallel zu einer axialen Mittellinie gelöst von den Ventilatorschaufeln.In an advantageous embodiment of the extractor device, the diagonal fan has a diagonal fan impeller with a surrounding cover plate. The cover disk is arranged on the diagonal fan wheel on the side facing the inlet and covers the otherwise free axial fan blade edges. In a portion facing towards the inlet, the shroud runs parallel to an axial centerline detached from the fan blades.

Ferner ist eine Weiterbildung der Erfindung günstig, bei der an dem Diagonalventilator eine den axialen Einlass bestimmende Einlassdüse mit sich in axialer Strömungsrichtung verringernder Strömungsquerschnittsfläche angeordnet ist. Vorteilhaft ist dabei, die Einlaufdüse einteilig mit dem Ventilatorgehäuse auszubilden bzw. durch die Einlaufdüse einen Teil des Ventilatorgehäuses zu bestimmen.Furthermore, a further development of the invention is favorable in which an inlet nozzle, which determines the axial inlet and has a flow cross-sectional area that decreases in the axial direction of flow, is arranged on the diagonal fan. It is advantageous to design the inlet nozzle in one piece with the fan housing or to define a part of the fan housing through the inlet nozzle.

Zudem erstreckt sich die Einlassdüse in einer Ausführungsvariante in axialer Richtung in das Diagonallüfterrad hinein, so dass ein axialer Überlappungsbereich zwischen dem Diagonallüfterrad und der Einlassdüse gebildet ist. Für eine kompakte Bauweise und ein strömungstechnisch optimales Zusammenwirken ist die Einlassdüse zumindest abschnittsweise von der Deckscheibe, insbesondere dem zum Einlass gerichteten parallel zur axialen Mittellinie verlaufenden Abschnitt umgeben.In addition, in one embodiment variant, the inlet nozzle extends in the axial direction into the diagonal fan wheel, so that an axial overlapping area is formed between the diagonal fan wheel and the inlet nozzle. For a compact design and an optimal interaction in terms of flow technology, the inlet nozzle is surrounded at least in sections by the cover plate, in particular by the section directed towards the inlet and running parallel to the axial center line.

In einer Weiterbildung der Dunstabzugsvorrichtung ist saugseitig an der Einlassdüse ein strömungsführendes Vorleitgitter angeordnet, das insbesondere zur Reduzierung der Geräuschemissionen beiträgt und störende niederfrequente Töne minimiert.In a further development of the fume extraction device, a flow-guiding preliminary guide grille is arranged on the suction side on the inlet nozzle, which contributes in particular to reducing noise emissions and minimizes disruptive low-frequency sounds.

Die Einlassdüse weist in einer vorteilhaften Ausführung eine maximale Einlassströmungsquerschnittsfläche auf, die Faktor 0,15 - 0,4 der maximalen Strömungskanalquerschnittsfläche bestimmt.In an advantageous embodiment, the inlet nozzle has a maximum Inlet flow cross-sectional area, which determines a factor of 0.15 - 0.4 of the maximum flow channel cross-sectional area.

Ferner ist in einer Ausführung der Dunstabzugsvorrichtung vorgesehen, dass an dem Diagonalventilator ein den axialen Auslass bestimmendes Nachleitrad mit sich in axialer Strömungsrichtung vergrößernder Strömungsquerschnittsfläche angeordnet ist. Vorzugsweise verjüngt sich die Strömungsquerschnittsfläche auf die Auslassöffnungsquerschnittsfläche. Dabei wird das Nachleitrad in axialer Strömungsrichtung gesehen nach dem Diagonallüfterrad angeordnet und ermöglicht eine Erhöhung der axialen Abströmgeschwindigkeit. Es trägt mithin zur Erhöhung des Wirkungsgrades bei. Vorteilhaft ist dabei ferner, das Nachleitrad einteilig mit dem Ventilatorgehäuse auszubilden bzw. durch das Nachleitrad einen Teil des Ventilatorgehäuses zu bestimmen.Furthermore, in one embodiment of the extractor device, it is provided that a guide wheel, which determines the axial outlet and has a flow cross-sectional area that increases in the axial direction of flow, is arranged on the diagonal fan. Preferably, the flow cross-sectional area tapers to the outlet opening cross-sectional area. Viewed in the axial flow direction, the guide vane is arranged after the diagonal fan impeller and enables an increase in the axial outflow velocity. It therefore contributes to increasing the efficiency. It is also advantageous to design the guide wheel in one piece with the fan housing or to define a part of the fan housing with the guide wheel.

Der Diagonalventilator weist in einem Ausführungsbeispiel ein mehrteiliges Gehäuse auf, über das er an dem Strömungskanal befestigt wird. Bei einer zweiteiligen Ausführung wird der erste Teil des Gehäuses durch die Einlassdüse, der zweite Teil durch das Nachleitrad gebildet.In one exemplary embodiment, the diagonal fan has a multi-part housing, via which it is fastened to the flow duct. In a two-part design, the first part of the housing is formed by the inlet nozzle and the second part by the guide vane.

Ferner ist Teil der Erfindung die Verwendung eines Diagonalventilators in einer Dunstabzugsvorrichtung wie vorstehend beschrieben. Der Diagonalventilator kann dabei einzelne oder alle der offenbarten Merkmale umfassen, soweit dies technisch möglich ist.Furthermore, part of the invention is the use of a diagonal fan in an extractor device as described above. The diagonal fan can include individual or all of the features disclosed, insofar as this is technically possible.

Andere vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet bzw. werden nachstehend zusammen mit der Beschreibung der bevorzugten Ausführung der Erfindung anhand der Figuren näher dargestellt. Es zeigen:

Fig. 1
eine beispielhaft schematische Darstellung einer Dunstabzugsvorrichtung gemäß dem Stand der Technik;
Fig. 2
eine seitliche Schnittansicht einer erfindungsgemäßen Dunstabzugsvorrichtung;
Fig. 3
ein Diagramm zur Darstellung des Druckverlaufs über dem Volumenstrom von Dunstabzugsvorrichtung.
Other advantageous developments of the invention are characterized in the dependent claims or are presented in more detail below together with the description of the preferred embodiment of the invention with reference to the figures. Show it:
1
an exemplary schematic representation of a fume extraction device according to the prior art;
2
a side sectional view of a vapor extraction device according to the invention;
3
a diagram to show the pressure curve over the volume flow of vapor extraction device.

In Figur 1 ist beispielhaft schematisch eine Dunstabzugshaube 200 gemäß dem Stand der Technik mit einem doppelflutigen Radialgebläse 210 dargestellt. Die von dem Radialgebläse 210 erzeugte Luftströmung ist mit Pfeilen S gezeigt, wobei gut zu erkennen ist, dass die Luftströmung mehrfach umgelenkt wird. Insbesondere erfolgt eine erste 90°-Umlenkung im Randabschnitt zwischen dem Strömungskanal und dem Radialventilator 210 beim Eintritt in den Ansaugabschnitt 211 sowie eine zweite 90°-Umlenkung innerhalb des Radialventilators 210, bevor die Strömung am Ausblasabschnitt 212 austritt.In figure 1 an extractor hood 200 according to the prior art with a double-flow radial fan 210 is shown schematically by way of example. The air flow generated by the radial fan 210 is shown with arrows S, it being easy to see that the air flow is deflected several times. In particular, there is a first 90° deflection in the edge section between the flow channel and the radial fan 210 upon entry into the intake section 211 and a second 90° deflection within the radial fan 210 before the flow exits at the exhaust section 212 .

Figur 2 zeigt eine Dunstabzugsvorrichtung 1 mit einem Ansaugbereich 2, einem sich in Strömungsrichtung an den Ansaugbereich 2 unmittelbar anschließenden, strömungsverbundenen und im Querschnitt quadratischen Strömungskanal 3 sowie einer Auslassöffnung 4, die in ein Rohr 23 mündet. In dem Strömungskanal 3 ist der Diagonalventilator 5 wandseitig befestigt. Die im Betrieb vom Diagonalventilator 5 erzeugte Luftströmung ist mittels der Pfeile P dargestellt. figure 2 shows a fume extraction device 1 with an intake area 2, a flow-connected flow channel 3 with a square cross-section, which is directly adjacent to the intake area 2 in the direction of flow, and an outlet opening 4, which opens into a pipe 23. In the flow channel 3, the diagonal fan 5 is attached to the wall. The air flow generated by the diagonal fan 5 during operation is represented by the arrows P.

Die Ansaugbereichsquerschnittsfläche des Ansaugbereichs 2 ist um ein Vielfaches größer als die Strömungskanalquerschnittsfläche des Strömungskanals 3, die Auslassöffnungsquerschnittsfläche der Auslassöffnung 4 ist kleiner als die Strömungskanalquerschnittsfläche des Strömungskanals 3. Der Diagonalventilator 5 weist in Richtung des Ansaugbereichs 2 den axialen Einlass 6 auf, über den im Betrieb Luft axial aus dem Strömungskanal 3 angesaugt und über den axialen Auslass 7 direkt in das Rohr 23 ausgeblasen wird. Der axiale Auslass 7 steht dabei unmittelbar mit der Auslassöffnung 4 und dem Rohr 23 in Verbindung. Die Auslassquerschnittsfläche des Auslasses 7 des Diagonalventilators 5 entspricht der der Auslassöffnungsquerschnittsfläche der Auslassöffnung 4.The intake area cross-sectional area of the intake area 2 is many times greater than the flow channel cross-sectional area of the flow channel 3, the outlet opening cross-sectional area of the outlet opening 4 is smaller than the flow channel cross-sectional area of the flow channel 3. The diagonal fan 5 has the axial inlet 6 in the direction of the intake area 2, via which during operation Air is sucked in axially from the flow channel 3 and blown out directly into the tube 23 via the axial outlet 7 . The axial outlet 7 is directly connected to the outlet opening 4 and the pipe 23 . The outlet cross-sectional area of the outlet 7 of the diagonal fan 5 corresponds to that of the exhaust port cross-sectional area of the exhaust port 4.

Der Diagonalventilator 5 weist in dem gezeigten Ausführungsbeispiel einen Aufbau mit einem zentral an einer Motoraufnahme 20 aufgenommenen und befestigten Motor 18 auf, um den der Druckraum herum geführt ist. Der Motor 18 treibt ein stromaufwärts angeordnetes Diagonallüfterrad 8 an, das eine umlaufende Deckscheibe 9 aufweist, die axial frei liegende Kanten der Diagonallüfterradschaufeln 19 teilweise überdeckt. Die Deckscheibe 9 verläuft im Einlaufabschnitt 21 parallel zur axialen Mittellinie und in stromabwärtiger Richtung schräg nach außen, so dass ein von der Deckscheibe 9 und der Bodenscheibe 28 gebildeter Strömungsraum im Wesentlichen bündig in den Druckraum übergeht. Der axiale Einlass 6 wird durch die Einlassdüse 10 gebildet, deren Strömungsquerschnittsfläche sich in axialer Strömungsrichtung verringert. Die Einlassdüse 10 weist eine Einlasskontur 24 auf, die sich in axialer Richtung in das Diagonallüfterrad 8 hinein erstreckt und mit dem Einlassabschnitt 21 der Deckscheibe 9 den axialen Überlappungsbereich 11 bildet. Zwischen der Einlasskontur 24 der Einlassdüse 10 und dem Einlassabschnitt 21 der Deckscheibe 9 ist ein umlaufender Radialspalt vorgesehen. Der Axialabstand zwischen den axialen Kanten der Diagonallüfterradschaufeln 19 und dem axialen Ende der Einlasskontur 24 der Einlassdüse 10 ist sehr gering und entspricht 10% der Axialerstreckung der Einlasskontur 24 der Einlassdüse 10. Die Einlassdüse 10 bildet eine maximale Einlassströmungsquerschnittsfläche, die 40% der Strömungskanalquerschnittsfläche entspricht. Ferner bildet die Einlassdüse 10 einen ersten Gehäuseteil des Diagonalventilators 5. Der zweite Gehäuseteil, der an den ersten Gehäuseteil unmittelbar angeschlossen und befestigt ist, wird durch das Nachleitrad 12 bereit gestellt. Das Nachleitrad 12 bildet den axialen Auslass 7und weist die Form des Druckraums mitbestimmende Strömungsleitelemente 22 auf, die sich um den Motor 18 bis zum Auslass 7 erstrecken und dabei in axialer Strömungsrichtung die Strömungsquerschnittsfläche zur Erzeugung einer Venturiwirkung vergrößern. Am Auslass 7 verläuft die die Strömung leitende Gehäuseaußenwand des Nachleitrads 12 parallel zur axialen Mittellinie.In the exemplary embodiment shown, the diagonal fan 5 has a structure with a motor 18 which is accommodated and fastened centrally on a motor mount 20 and around which the pressure chamber is routed. The motor 18 drives a diagonal fan wheel 8 arranged upstream, which has a circumferential cover disk 9 which partially covers the axially exposed edges of the diagonal fan wheel blades 19 . The cover disk 9 runs in the inlet section 21 parallel to the axial center line and obliquely outwards in the downstream direction, so that a flow space formed by the cover disk 9 and the base disk 28 merges essentially flush into the pressure space. The axial inlet 6 is formed by the inlet nozzle 10, the flow cross-sectional area of which decreases in the axial direction of flow. The inlet nozzle 10 has an inlet contour 24 which extends in the axial direction into the diagonal fan wheel 8 and forms the axial overlap region 11 with the inlet section 21 of the cover plate 9 . A circumferential radial gap is provided between the inlet contour 24 of the inlet nozzle 10 and the inlet section 21 of the cover disk 9 . The axial distance between the axial edges of the diagonal fan wheel blades 19 and the axial end of the inlet contour 24 of the inlet nozzle 10 is very small and corresponds to 10% of the axial extent of the inlet contour 24 of the inlet nozzle 10. The inlet nozzle 10 forms a maximum inlet flow cross-sectional area which corresponds to 40% of the flow channel cross-sectional area. Furthermore, the inlet nozzle 10 forms a first housing part of the diagonal fan 5. The second housing part, which is directly connected and fastened to the first housing part, is provided by the guide vane 12. The guide vane 12 forms the axial outlet 7 and has the shape of the pressure chamber co-determining flow guide elements 22, which extend around the motor 18 to the outlet 7 and thereby in the axial direction of flow Increase flow cross-sectional area to create a venturi effect. At the outlet 7, the outer housing wall of the guide vane 12 that guides the flow runs parallel to the axial center line.

Figur 3 zeigt den geringeren Druckverlust bei der Verwendung des in Figur 2 gezeigten Diagonalventilators 5 in einer Dunstabzugsvorrichtung 1 gegenüber den aus dem Stand der Technik bekannten Lösungen, wobei die Graphen 66 und 77 sich auf einen Radialventilator und einen Radialventilator eingebaut in einer Dunstabzugsvorrichtung und die Graphen 88 und 99 sich auf einen Diagonalventilator 5 und einen Diagonalventilator 5 im gemäß Figur 2 eingebauten Zustand beziehen. Die beiden Graphen 88 und 99 liegen vor allem bei höheren Volumenströmen deutlich näher zusammen. figure 3 shows the lower pressure loss when using the in figure 2 shown diagonal fan 5 in an extractor device 1 compared to the solutions known from the prior art, with graphs 66 and 77 relating to a radial fan and a radial fan installed in an extractor device and graphs 88 and 99 relating to a diagonal fan 5 and a diagonal fan 5 in the refer to Figure 2 installed state. The two graphs 88 and 99 are much closer together, especially at higher volume flows.

Die Erfindung beschränkt sich in ihrer Ausführung nicht auf die vorstehend angegebenen bevorzugten Ausführungsbeispiele. Vielmehr ist eine Anzahl von Varianten denkbar, welche von der dargestellten Lösung auch bei grundsätzlich anders gearteten Ausführungen Gebrauch macht. Beispielsweise kann an der Einlassdüse stromaufwärts ein Vorleitgitter angeordnet werden, selbst wenn dies nicht in den Figuren gezeigt ist. Zudem kann der Diagonalventilator auch nur axialseitig am Strömungskanal befestigt werden und in radialer Richtung zum Strömungskanal beabstandet sein.The implementation of the invention is not limited to the preferred exemplary embodiments specified above. Rather, a number of variants are conceivable which make use of the solution shown even in the case of fundamentally different designs. For example, even if it is not shown in the figures, a flow guide grid can be arranged at the inlet nozzle upstream. In addition, the diagonal fan can also be attached to the flow duct only on the axial side and be spaced apart from the flow duct in the radial direction.

Claims (13)

  1. A fume extraction device with an intake region (2), a flow channel (3) which is adjacent and fluidly connected to the intake region (2) in the direction of flow, and an outlet opening (4), wherein a cross-sectional surface area of the intake region is larger than a cross-sectional surface area of a flow channel, and a cross-sectional surface area of an outlet opening is smaller than the cross-sectional surface area of a flow channel, wherein a diagonal fan (5) with an axial inlet (6) and an axial outlet (7) is arranged in the flow channel (3) which, during operation, sucks air axially out of the flow channel (3) via the axial inlet (6) and blows the same out axially via the axial outlet (7) into the outlet opening (4), which is fluidly connected to the outlet (7).
  2. The fume extraction device as set forth in claim 1, characterized in that a cross-sectional surface area of the outlet of the diagonal fan (5) corresponds to the cross-sectional surface area of the outlet opening.
  3. The fume extraction device as set forth in claim 1 or 2, characterized in that the cross-sectional surface area of the intake is larger by a factor of from 2 to 20 than the cross-sectional surface area of the flow channel.
  4. The fume extraction device as set forth in at least one of preceding claims, characterized in that the diagonal fan (5) has a diagonal fan wheel (8) with circumferential cover plate (9).
  5. The fume extraction device as set forth in the preceding claim, characterized in that the cover plate (9) is arranged on the diagonal fan wheel (8) on a side pointing toward the inlet (6) of the diagonal fan (5).
  6. The fume extraction device as set forth in at least one of the preceding claims, characterized in that an inlet nozzle (10) which defines the axial inlet (6) and has a flow cross-sectional surface area that decreases in the axial direction of flow is arranged on the diagonal fan (5).
  7. The fume extraction device as set forth in the preceding claim, characterized in that the inlet nozzle (10) extends in the axial direction into the diagonal fan wheel (8), whereby an axial overlapping region (11) is formed.
  8. The fume extraction device as set forth in the preceding claim, characterized in that the inlet nozzle (10) is surrounded at least in portions by the cover plate (9), whereby the inlet nozzle (10) and the cover plate (9) form the overlapping region (11).
  9. The fume extraction device as set forth in any one of the preceding claims, characterized in that a flow-guiding flow grid is arranged at the inlet nozzle (10).
  10. The fume extraction device as set forth in at least one of preceding claims 6 to 9, characterized in that the inlet nozzle (10) has an inlet flow cross-sectional surface area which determines the cross-sectional surface area of the flow channel by a factor of from 0.15 to 0.4.
  11. The fume extraction device as set forth in at least one of the preceding claims, characterized in that a guide wheel (12) which defines the axial outlet (7) is arranged at the diagonal fan (5), with a housing wall portion of the guide wheel (12) extending at the outlet (7) parallel to an axial center line of the diagonal fan (5).
  12. The fume extraction device as set forth in at least one of the preceding claims, characterized in that the diagonal fan (5) has a multipart housing which is attached to the flow channel (3).
  13. Use of a diagonal fan (5) in a fume extraction device (1) as set forth in one of the preceding claims.
EP17719544.3A 2016-04-28 2017-04-20 Hood with mix axial/radial ventilator Active EP3334942B1 (en)

Applications Claiming Priority (2)

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DE102016107921.9A DE102016107921A1 (en) 2016-04-28 2016-04-28 Extractor fan with diagonal fan
PCT/EP2017/059387 WO2017186565A1 (en) 2016-04-28 2017-04-20 Steam extraction device with diagonal ventilator

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EP3334942A1 EP3334942A1 (en) 2018-06-20
EP3334942B1 true EP3334942B1 (en) 2022-08-10

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DE (1) DE102016107921A1 (en)
ES (1) ES2927704T3 (en)
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WO (1) WO2017186565A1 (en)

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AU2020233744B2 (en) * 2019-09-20 2023-06-29 ResMed Pty Ltd System and Method for Reducing Noise in a Flow Generator
SE545112C2 (en) * 2020-03-24 2023-04-04 Swegon Operations Ab Air Handling Unit comprising flow guiding stator disc
US11668314B2 (en) 2020-11-10 2023-06-06 Greenheck Fan Corporation Efficient fan assembly
DE202022101494U1 (en) 2021-11-10 2022-11-03 Berbel Ablufttechnik Gmbh extractor hood
DE102021129263A1 (en) 2021-11-10 2023-05-11 Berbel Ablufttechnik Gmbh extractor hood

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WO2017186565A1 (en) 2017-11-02
DE102016107921A1 (en) 2017-11-02
PL3334942T3 (en) 2022-10-24
ES2927704T3 (en) 2022-11-10

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