WO2023144060A1 - Ventilateur pour dispositif de hotte aspirante, et dispositif de hotte aspirante - Google Patents

Ventilateur pour dispositif de hotte aspirante, et dispositif de hotte aspirante Download PDF

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Publication number
WO2023144060A1
WO2023144060A1 PCT/EP2023/051489 EP2023051489W WO2023144060A1 WO 2023144060 A1 WO2023144060 A1 WO 2023144060A1 EP 2023051489 W EP2023051489 W EP 2023051489W WO 2023144060 A1 WO2023144060 A1 WO 2023144060A1
Authority
WO
WIPO (PCT)
Prior art keywords
fan
motor
impeller
housing
rotor
Prior art date
Application number
PCT/EP2023/051489
Other languages
German (de)
English (en)
Inventor
Jens Herbst
Gerald Horst
Paul Wackwitz
Original Assignee
BSH Hausgeräte GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BSH Hausgeräte GmbH filed Critical BSH Hausgeräte GmbH
Publication of WO2023144060A1 publication Critical patent/WO2023144060A1/fr

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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
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
    • 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
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system

Definitions

  • the present invention relates to a fan for a vapor extraction device and a vapor extraction device with such a fan.
  • Vapor extraction devices are known in the kitchen, which are also referred to as hob extractors or table extractors. These downdraft fans are installed in or next to the hob. The fumes and vapors produced on the hob are sucked downwards into the extractor hood via an extraction opening in or next to the hob.
  • liquids can get into the motor, for example when food boils over, splashes or when cleaning the hob, which can lead to damage or failure of the motor.
  • the motor heats up during operation, so adequate cooling is required for reliable motor operation.
  • open motor designs are primarily used in extractor hoods. These open-plan engines are characterized by their efficient and robust design.
  • a main aspect is the open air accessibility which ensures sustainable cooling. Without taking the motor efficiency into account in detail, one can state that the waste heat from the motor increases with increasing shaft power. This increase in waste heat is compensated for by the simultaneous increase in the displacement volume of the fan. The cooling takes place by forced convection. From a cost and development point of view, enclosing the motors in these cases does not make sense. On the contrary, housing can lead to inadequate cooling and a safety-related electrical shutdown.
  • the motor in particular the stator
  • the encapsulated motor can have a temperature that is twice as high as an open motor design with the same shaft power. Assuming a limit temperature of, for example, 130-140° C. in the motor windings, the operation of such a motor in a fan for higher delivery volumes is ruled out.
  • the invention is therefore based on the object of creating a solution by means of which the motor can be successfully sealed off from liquid while cooling is ensured at the same time.
  • the invention therefore relates to a fan for a fume extraction device, which has a motor and an impeller which is connected to the rotor of the motor and has main blades arranged on the outer edge.
  • the fan is characterized in that the fan has a motor cover, there is a gap between the impeller and the motor cover, and the fan has auxiliary blades lying in the gap.
  • the fan can also be referred to as a fan or blower and, according to the invention, comprises a motor and an impeller.
  • the impeller can also be referred to as a paddle wheel.
  • the motor includes a rotor and a stator.
  • the impeller is connected to the rotor and is rotated by it.
  • the impeller has blades.
  • the main blades are the blades that are provided on the outer edge of the impeller.
  • the main blades are preferably arranged in an annular row.
  • the main blades can be arranged on the impeller at a distance from the outer circumference of the impeller be. In this case, the distance between the outer circumference and the main blades is small.
  • the outer edge of the impeller can also be referred to as the outer area of the impeller.
  • the impeller is connected to the rotor of the motor.
  • the impeller can include a fastening section, which can also be referred to as an impeller hub and which can represent a dome-shaped dome, for example.
  • a disc then connects to the lower edge of the impeller hub, the outer edge of the impeller adjoining the outer circumference of the disc.
  • the outer edge of the impeller is lower than the top of the impeller, in particular the top of the dome.
  • the intake area of the fan is defined by the main blades and the disc.
  • the main blades are preferably arranged directly on the outer circumference or at a small distance from the outer circumference.
  • the fan comprises a motor cover, which can also be referred to as a screen.
  • a motor cover is a part that covers the motor in the direction that serves as the suction side when the fan is operating.
  • the fan is preferably a one-sided suction fan and the motor cover is arranged in such a way that it is located in the intake chamber of the fan and covers the motor.
  • the engine cover is preferably made of an air and liquid impermeable material.
  • the extractor device for which the fan is preferably used is a downdraft ventilation.
  • the fan is positioned in the extractor device in such a way that it is located below the suction opening and the suction side of the fan that sucks on one side faces upwards and thus faces the suction opening.
  • the motor cover is located above the motor.
  • directional references such as above and below refer to the fan and its components in a state installed in a range hood, in which the fan is used as a single-inlet fan and in which the suction side of the fan is directed upwards.
  • the invention is further characterized in that the fan has auxiliary blades located between the impeller and the motor cover.
  • the additional blades are on the rotor or on the impeller and preferably extend backwards above.
  • the distance between the additional blades and the underside of the engine cover is small. However, this distance is at least large enough to prevent the additional blade from hitting the motor cover when the rotor and thus the impeller rotate.
  • the shape of the engine cover can be adapted to the engine geometry.
  • the motor cover may have an inverted cup shape.
  • the distance between the auxiliary blades and the engine cover increases in the radially inward direction.
  • the engine cover is dimensioned so that it covers the engine, especially at the top.
  • the motor cover is preferably dimensioned such that it has a diameter that is larger than the diameter of the motor and particularly preferably also larger than the diameter of the impeller hub, by means of which the impeller is held on the motor. This reliably prevents liquid from entering from above.
  • the engine cover By positioning the engine cover so that the auxiliary blades are arranged between it and the engine, there is a gap between the engine cover and the engine at the top thereof.
  • the minimum height of the gap corresponds to the height of the additional blades.
  • the end of the gap can be vertical, ie in the radial direction, horizontal, ie in the axial direction, or at an angle between the vertical and the horizontal. As a result, an air flow leaving the gap can be discharged sideways, downwards or at an angle.
  • an air flow can be generated in the gap by rotating the additional blades in a gap between the motor and the motor cover, in particular between the impeller and the motor cover.
  • This air flow preferably results in air being sucked in from underneath the engine and thus being guided through the engine.
  • openings can be made in the engine that allow such suction, or the engine itself has an open geometry.
  • at least the top of the engine, but preferably the entire engine can be cooled by the air flow generated by the additional blades, which is also referred to as the cooling air flow, and the engine is still reliable against the ingress of liquids due to the engine cover provided in the intake chamber protected.
  • the motor cover is therefore used both for water protection, in particular with its top, and as a cooling fan, in particular with its underside in combination with the additional blades.
  • the structure of the fan according to the invention is therefore advantageous because it has a simple structure. In particular, no separate cooling fan is required.
  • the cooling fan which is formed by the motor cover and the auxiliary blades driven by the motor of the main fan, which comprises the motor, the main blades and preferably a housing, is scaled in its characteristics by the speed of the main fan. If the cooling is designed for the free air condition, this means an improvement in the cooling of the fan (cooling designed for V*max, same cooling capacity at V*max/2).
  • the engine cover at least partially covers the engine in the intake area.
  • the area that is surrounded by the main blades and in which the engine is located is referred to as the intake area.
  • the main air flow is sucked into the fan via this intake area.
  • the engine cover completely covers the engine at the top.
  • this can cover at least part of the lateral surface of the motor, in particular part of the lateral surface of the rotor and/or the impeller hub to the side.
  • the motor cover preferably covers the upper edge of the motor, in particular the rotor, or the impeller hub.
  • a gap is also formed in the radial direction between the motor, in particular the outside of the rotor or the impeller hub and the motor cover. This allows the air flow generated via the cooling fan to be discharged in a direction inclined downward or directed axially downward.
  • the additional blades can be located on the upper side of the rotor or the impeller hub or alternatively or additionally can be arranged on the outer lateral surface of the rotor or the outer lateral surface of the impeller hub.
  • the additional blades are preferably provided on the impeller hub. However, it is also within the scope of the invention to attach them to the rotor, if necessary, by means of an additional element. If the additional blades are provided on the impeller hub, they can, as described, preferably be on the upper side of the impeller hub and/or be provided on the jacket wall of the impeller hub in an upper area that is covered laterally by the motor cover.
  • the ventilator is preferably a unidirectional suction ventilator. This type of fan is particularly suitable for use in an extractor device that represents downdraft ventilation.
  • the motor has an air-permeable geometry.
  • a geometry that allows an axial flow of air through the engine is referred to as an air-permeable geometry.
  • the air permeability can be created by the distances between the windings of the stator and, if necessary, cutouts in the rotor.
  • the fan preferably has a fan housing with a housing base.
  • the fan housing is particularly preferably a spiral housing.
  • the air inlet opening of the fan housing is provided on the side of the fan housing opposite the housing base, through which air can enter the fan housing and reach the suction chamber of the impeller.
  • At least one opening is provided in the housing floor of the fan housing.
  • the at least one opening is at a distance from the axis of the motor, which is also referred to as the axis of rotation, and is preferably below the motor.
  • the at least one opening is particularly preferably located below the stator windings of the stator and/or below the gap between the stator and the rotor.
  • a plurality of openings are preferably provided in the housing base.
  • Cooling air can be sucked in through the at least one opening in the housing floor, which air then flows through the motor to the additional blades and is blown out of the gap via them.
  • the available for the cooling air flow The amount of air is increased compared to the pure use of the leakage and the cooling is thus further improved.
  • Both the main blades and the holes in the housing are designed in such a way that the necessary flow of cooling air can be guaranteed. If the necessary cooling should be less than expected, the cooling air intake via the openings can be dispensed with, i.e. the openings can be closed or not provided, and work is carried out purely with the leakage flow below the impeller.
  • the housing base is inclined upwards towards the axis of rotation. Due to the slope of the bottom of the housing in the direction of the axis of rotation, the ingress of liquids, which may be entrained by the leakage, into the motor can be prevented.
  • the inclination or slope in the bottom of the housing allows the liquid to flow away from the motor.
  • the slope in the bottom of the housing can extend over the entire radial distance between the outside of the bottom of the housing and the axis of rotation. Alternatively, the gradient can also extend over only part of the radial distance.
  • the incline in the housing base can end in front of the opening in the radially inward direction. Thus, in front of the opening, an elevation is created on the bottom of the housing, which prevents liquids from entering the opening and into the motor.
  • At least one projection is provided on the underside of the impeller.
  • the at least one projection is provided on the outer edge of the underside of the impeller. This provides additional protection against the ingress of liquid into the space between the bottom of the housing and the underside of the impeller.
  • These rapidly rotating protrusions which can also be referred to as ridges, displace liquid on contact. This acceleration takes place radially outwards and thus counteracts a penetrating flow of liquid.
  • a labyrinth seal is provided between the housing floor and the impeller. In this way, the lower area of the fan can be sealed against the ingress of liquid and a possible loss of pressure.
  • the labyrinth seal is arranged as close as possible to the axis of rotation.
  • the labyrinth seal is formed by a plurality of circular ribs on the underside of the rotor and a plurality of offset circular ribs on the upper side of the housing base.
  • the invention relates to an extractor device which has at least one fan according to the invention.
  • the fume extraction device is preferably an fume extraction device that has a suction opening through which air is drawn in downwards.
  • This type of extractor device can also be referred to as a downdraft fan.
  • the at least one fan is preferably arranged below the intake opening.
  • the at least one fan can be aligned with the suction opening in plan view or be offset to it.
  • the fan is preferably arranged in such a way that the intake space of the fan faces upwards.
  • the suction chamber of the fan is therefore preferably facing the suction opening.
  • the suction chamber of the fan and in particular the air inlet opening of the fan can be parallel to the suction opening or at an angle to the suction opening. This angle is preferably in a range between 0 and 90°.
  • the vapor extraction device is particularly preferably integrated into a hob.
  • the suction opening is preferably in an opening in the surface of the hob.
  • the extractor device can also be connected to the hob, in particular the suction opening can be arranged adjacent to the hob.
  • the ingress of liquids is particularly prevented by the engine cover.
  • penetration can be further prevented by the geometry of the housing floor, the underside of the impeller and/or by one or more seals, for example labyrinth seals.
  • Cooling is provided by the flow of cooling air generated by the additional blades in cooperation with the engine cover.
  • the flow of cooling air preferably flows through the motor in the axial direction.
  • the cooling air can be sucked in through the space between the underside of the impeller and the top of the housing base.
  • cooling air can preferably be sucked in via at least one opening in the housing base of the fan housing.
  • FIG. 1 a schematic sectional view of an embodiment of a vapor extraction device according to the invention
  • Figure 2 is a schematic perspective view of a stator of an open geometry motor
  • Figure 3 a schematic perspective sectional view of a first
  • Figure 4 a schematic sectional view of part of a second
  • FIG. 5 a schematic sectional view of part of a third embodiment of the fan according to the invention.
  • FIG. 6 a schematic sectional view of part of a fourth
  • Embodiment of the fan according to the invention Embodiment of the fan according to the invention.
  • FIG. 1 shows an embodiment of the fume extraction device 1 according to the present invention.
  • the extractor device 1 is a downdraft fan.
  • the extractor device 1 is integrated into a hob 2 .
  • the hob 2 has a cover plate 20 .
  • the hob 2 preferably has heating modules (not shown), which can be attached to the underside of the cover plate 20 .
  • An opening is made in the cover plate 20 and forms the suction opening 10 of the fume extraction device 1 .
  • a filter unit 11 is arranged in the suction opening 10 .
  • the fume extraction device 1 also has a fan 3 which is arranged below the extraction opening 10 . Only the fan housing 4 of the fan 3 is visible in FIG.
  • the fan 3 is arranged on the floor of the vapor extraction device 1 and is located below the filter unit 11. Vapors and vapors that arise during cooking are sucked in by the fan 3 via the suction opening 10, preferably cleaned in the filter unit 11 and after passing the fan 3 via an air outlet (not shown) from the extractor device 1.
  • the fan 3 is operated with a motor 5 (see FIGS. 3 to 6).
  • the motor 5 represents an electric motor with a stator 50 and a rotor 51 (see FIGS. 3 to 6).
  • FIG. 2 shows an embodiment of a stator 50 by way of example. As can be seen from FIG. 2, the stator 50 has an open structure. In particular, the gaps between the windings 500 are not closed. The stator 50 is therefore permeable to air in the axial direction.
  • FIG. 3 shows a schematic view of a first embodiment of the fan 3 according to the invention.
  • the fan 3 includes a fan housing 4, which is preferably a spiral housing.
  • An air inlet opening 41 is provided in the upper side of the housing, which is covered by a protective grille 42 in the embodiment shown.
  • the fan housing 4 also has an air outlet provided on the circumference of the housing 4, which is not shown in FIG.
  • a motor 5 with an impeller 52 provided thereon is accommodated in the housing 4 .
  • the motor 5 comprises a stator 50 and a rotor 51.
  • the stator 50 has windings 500 which are arranged radially in the circumferential direction around the axis of rotation 510 at a distance from one another.
  • the rotor 51 is designed as an external rotor and is also referred to as a rotor or motor rotor.
  • the rotor 51 has a U-shaped cross section in the radial direction, the open side of which is directed downward.
  • the U-shaped cross section of the rotor 51 surrounds the windings 500 of the stator 50. In the embodiment shown, cutouts are made on the upper side of the rotor 51, so that the rotor 51 is also permeable to air in the axial direction of the axis of rotation 510.
  • An impeller 52 which can also be referred to as an impeller, is attached to the rotor 51.
  • the impeller 52 can be molded onto the rotor 51 .
  • the impeller 52 has a mounting portion 522, which is also referred to as an impeller hub, a disc 523 and an outer rim 524.
  • the impeller 52 is connected to the rotor 51 at the fastening section 522 .
  • the attachment portion 522 has a dome shape, surrounds the periphery of the U-shaped rotor 51 and covers part of the bottom of the U-shape, that is, part of the top of the rotor 51 . On the part that at the Additional blades (not shown) rest against the top of the rotor 51 . This will be explained in more detail later with reference to FIGS.
  • the top of the motor 5, in particular the rotor 51 is covered by a motor cover (not shown). This is also explained in more detail later with reference to FIGS.
  • the disc 523 of the impeller 52 extends outward.
  • the disk 523 extends radially outward from the lower end of the mounting portion 522 and slopes downward.
  • the outer edge 524 of the impeller 52 adjoins the outer circumference of the disk 523 .
  • Outer rim 524 is preferably level, that is, perpendicular to the axis of rotation 510 of rotor 51.
  • a row of main vanes 520 are provided on top of outer rim 524.
  • the main blades 520 are distributed in the circumferential direction.
  • the inner diameter of the blade ring formed by the main blades 520 is larger than the diameter of the air inlet opening 41 of the housing 4.
  • the housing base 40 of the housing 4 has a wall thickness which increases towards the axis of rotation.
  • the top of the housing base 40 forms a cone shape.
  • the inclination of the housing base 40 corresponds to the inclination of the disc 523 of the impeller 52.
  • the stator 50 is fixed in the middle of the housing base 40.
  • a gap 8 is formed between the underside of the impeller 52 and the top of the housing base 40 (see FIG. 2).
  • the second embodiment shown in Figure 4 differs from the first embodiment in that the disk 523 of the impeller 52 consists of a horizontal outer part and an inclined inner part, the inner part being inclined upwards in a steeper than the disk 523 of the first embodiment.
  • the slope of the elevation 41 on the upper side of the housing base 40 is steeper.
  • 52 projections 6 are provided in the second embodiment on the underside of the impeller, which extend downwards.
  • the projections 6 are provided on the underside of the outer edge 524 and the outer part of the disc 523 in the embodiment shown.
  • the projections 6 can be ring-shaped and extend in the circumferential direction of the impeller 52 .
  • the projections 6 may be punctiform and for one or more rows of projections 6 to be arranged in the circumferential direction of the impeller 52 on the underside of the impeller 52 .
  • the other components of the fan 3 correspond to those of the first embodiment and are therefore not explained again.
  • the fan 3 also has a motor cover 53 in the second embodiment.
  • the motor cover 53 covers the motor 5 from above.
  • the motor cover 53 has a diameter that is larger than the largest diameter of the motor 5, in particular than the outer diameter of the rotor 51.
  • the diameter of the motor cover 53 is larger than the outer diameter of the rotor 51 with the attachment portion 522 of the impeller 52 attached thereto.
  • the fan 3 has additional blades 521 in the second embodiment as well.
  • the additional blades 521 are arranged in a ring shape on the upper side of the rotor 51 , in particular on the upper part of the fastening section 522 of the impeller 52 .
  • the additional blades thus extend parallel to the axis of rotation 510.
  • the engine cover has an inverted cup or cap shape in the first and second embodiments.
  • the bottom of the cap rests on the top of the stator 50 or is located a small distance above the top of the stator 50 .
  • the engine cover 53 extends downwardly from the floor at an angle and terminates with a fold downwardly at an even steeper angle.
  • the bevel is offset outwards in the radial direction relative to the outer diameter of the fastening section 522 of the impeller.
  • a gap 531 is formed between the motor cover 53 and the motor 5 .
  • the gap 531 extends radially outwards in particular over the top of the rotor 51 and ends in the distance between the axial part of the Fastening section 522 and the fold of the motor cover 53.
  • the additional blades 521 are located in this gap 531.
  • the function of the first embodiment of the fan 3 is explained below.
  • the impeller 52 is rotated by the motor 5, as a result of which air is sucked into the fan 3.
  • This air is also referred to as the main volume flow H.
  • the air emerges from the intake chamber 30 through the spaces between the main blades 520 and is discharged from the fan 3 and then from the fume extraction device 1 via an air outlet opening (not shown). Since the auxiliary blades 521 are provided on the rotor 51, and particularly on the top of the impeller 52 fixed to the rotor 51, as the impeller 52 rotates, the row of auxiliary blades 521 is also rotated.
  • the cooling air K is sucked out of the intake space 30 through the intermediate space 8 formed between the underside of the impeller 52 , in particular the disk 523 , and the top side of the housing base 40 .
  • the cooling air K thus flows in the intermediate space 8 from the outside of the impeller 52 inwards and flows from below towards the motor 5, in particular the rotor 51 and the windings 50 of the stator 50 surrounded by it.
  • the air After passing through the recesses in the top of the rotor 51, the air is deflected through the engine cover into the gap 531 and discharged into the intake chamber 30 at the outer diameter of the rotor 51 and the fastening section 522 attached thereto.
  • Liquid that may enter the fan 3 through the suction opening 10 of the fume extraction device 1 is prevented from entering the motor 5 from above by the motor cover 53 .
  • Liquid which has already entered the fan housing 4 is prevented from entering the motor 5 via the gap 8 by the slope provided at the top of the housing bottom 4.
  • Embodiment and differs only by the additional protection provided by the Projections 6 is created.
  • the rapidly rotating projections 6 displace liquid upon contact. This acceleration takes place radially outwards and thus counter to the penetrating flow of liquid.
  • FIG. 5 shows a third embodiment of the fan 3 according to the invention.
  • This embodiment differs from the second embodiment only in that openings 9 are provided in the housing base 40, only one of which is visible in FIG.
  • the openings 9 are distributed in the circumferential direction in the housing base 40 .
  • the opening 9 is preferably below the rotor 51 and the windings 500 of the stator 50.
  • an additional air flow to the cooling air flow K can be provided when the fan 5 is in operation. This additional air flow is sucked in from below the fan housing 4 .
  • the further mode of operation of the third embodiment corresponds to that of the second embodiment.
  • a fourth embodiment of the fan 3 is shown in FIG. This embodiment differs from the third embodiment in that no projections are provided on the underside of the impeller 52 . Instead, a seal 7 is provided between the impeller 52 and the housing floor 40 .
  • the seal 7 constitutes a labyrinth seal.
  • the labyrinth seal is formed by circular ribs 70 extending downward from the underside of the impeller 52 and offset circular ribs 71 extending from the housing bottom 40 upwards.
  • the seal 7 is arranged at the transition between the outer part and the inner part of the disk 523 of the impeller 52 . Should liquid penetrate into the labyrinth seal, it will be greatly accelerated by the shearing forces and increased centrifugal forces will occur.
  • the seal is provided as close as possible to the axis of rotation 510, in particular at the point on the impeller 52 at which the distance from the housing base 40 is small and which has the smallest distance to the axis of rotation 510.
  • the present invention is not limited to the embodiments shown.
  • an embodiment can be used which corresponds to the fourth embodiment, but which has no openings 9.
  • the fan according to the invention can also be used in applications in which the fan is a fan without a requirement for cooling air.
  • the lack of cooling demand may be due to the low flow rate required or due to the dispensability of the liquid shield.
  • the motor cover can be omitted in fans where no increased water protection measures are necessary.
  • the holes in the fan housing can be sealed on the device side (e.g. with a non-perforated sheet metal rear panel).
  • the additional blades or cooling air blades are still included and rotate, but due to the lack of housing due to the lack of engine cover and the resulting lack of volume flow, they hardly contribute to the power conversion.
  • the motor cover ensures liquid protection, which can also be referred to as splash water protection.
  • the additional blades on the top of the rotor or impeller provide a cooling fan with the same impeller as for the main fan in a simple manner.
  • the cooling is automatically controlled via the speed of the impeller.
  • the cooling depends on the pressure difference between the environment (cooling air opening) and the intake chamber. With different appliance arrangements, in particular fan arrangements or extractor arrangement, the cooling will potentially behave differently. The cooling decreases at lower main volume flows. Since cooling is not required in this operating state of the fan, energy is saved.
  • the fan according to the invention can also be used in other ways. In particular, this can be used for the second application in which there is no requirement for spray water.
  • auxiliary blades which may also be referred to as cooling fan blades, will impart some energy to the fluid, which is not necessary but manageable.
  • the fan can be designed uniformly for different applications.
  • the variants can differ in the motor mount in the device, especially in the fan.
  • the engine cover is a separate, preferably detachable component. In the application without an engine cover, only the engine mount is available as a separate component.
  • the fan housings which can also be referred to as spirals, can preferably have openings, which can also be referred to as small holes, for the inflow of cooling air for all applications.
  • a possible closure can be implemented on the device side, eg by means of a sheet metal mount on the underside or rear of the fan.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

La présente invention concerne un ventilateur pour un dispositif de hotte aspirante (1), lequel ventilateur a un moteur (5) et une roue (52) qui est reliée au rotor (51) du moteur (5) et au niveau du bord externe (524) duquel des pales principales (520) sont agencées. Le ventilateur est caractérisé en ce que : le ventilateur (3) a un carter de moteur (53) ; il existe un espace (531) entre la roue (52) et le carter de moteur (53) ; et le ventilateur (3) comprend des pales supplémentaires (521) qui sont situées dans l'espace (531). L'invention concerne également un dispositif de hotte aspirante (1) comprenant au moins un ventilateur (3) de ce type.
PCT/EP2023/051489 2022-01-26 2023-01-23 Ventilateur pour dispositif de hotte aspirante, et dispositif de hotte aspirante WO2023144060A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022200839.1A DE102022200839A1 (de) 2022-01-26 2022-01-26 Ventilator für Dunstabzugsvorrichtung und Dunstabzugsvorrichtung
DE102022200839.1 2022-01-26

Publications (1)

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WO2023144060A1 true WO2023144060A1 (fr) 2023-08-03

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DE (1) DE102022200839A1 (fr)
WO (1) WO2023144060A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2209410A5 (fr) * 1972-11-03 1974-06-28 Technicair Sa
EP1993864B1 (fr) * 2006-02-01 2011-03-16 Robert Bosch GmbH Canal de refroidissement pour assemblage de ventilateur cvca d'automobile
US20130323096A1 (en) * 2011-03-26 2013-12-05 Ebm-Papst St. Georgen Gmbh & Co. Kg Diagonal fan
EP2741403A2 (fr) * 2012-12-10 2014-06-11 Nidec Corporation Moteur et ventilateur
US20150044076A1 (en) * 2013-08-07 2015-02-12 Delta Electronics, Inc. Fan

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2209410A5 (fr) * 1972-11-03 1974-06-28 Technicair Sa
EP1993864B1 (fr) * 2006-02-01 2011-03-16 Robert Bosch GmbH Canal de refroidissement pour assemblage de ventilateur cvca d'automobile
US20130323096A1 (en) * 2011-03-26 2013-12-05 Ebm-Papst St. Georgen Gmbh & Co. Kg Diagonal fan
EP2741403A2 (fr) * 2012-12-10 2014-06-11 Nidec Corporation Moteur et ventilateur
US20150044076A1 (en) * 2013-08-07 2015-02-12 Delta Electronics, Inc. Fan

Also Published As

Publication number Publication date
DE102022200839A1 (de) 2023-07-27

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