EP2940311B1 - Ventilateur radial présentant une géométrie de bord d'attaque améliorée - Google Patents

Ventilateur radial présentant une géométrie de bord d'attaque améliorée Download PDF

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Publication number
EP2940311B1
EP2940311B1 EP15163971.3A EP15163971A EP2940311B1 EP 2940311 B1 EP2940311 B1 EP 2940311B1 EP 15163971 A EP15163971 A EP 15163971A EP 2940311 B1 EP2940311 B1 EP 2940311B1
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EP
European Patent Office
Prior art keywords
edge section
impeller
radial fan
overflowed
opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15163971.3A
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German (de)
English (en)
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EP2940311A1 (fr
Inventor
Peter Rademacher
Tobias Hofmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication date
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Publication of EP2940311A1 publication Critical patent/EP2940311A1/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
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • 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
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • F04D29/444—Bladed diffusers
    • 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
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/52—Outlet

Definitions

  • the invention relates to a radial blower, in particular a radial blower for a vacuum cleaner, which comprises an impeller which can be rotated about an axis of rotation and can be driven by a motor and which has a plurality of blades for generating an at least partially radially outwardly directed air flow, and a stationary guide device which has a diffuser plate arranged perpendicular to the axis of rotation axially adjacent to the impeller, an annular wall surrounding the latter radially on the outside and a hood at least partially enclosing the impeller, a continuous annular space surrounding the impeller being formed between the hood, the impeller and the diffuser plate.
  • the task of a blower is to provide suction power as a product of the vacuum and volume flow.
  • Radial blowers are generally used in vacuum cleaners.
  • a radial fan comprises a drive motor, in particular an electric motor, and an aerodynamic device, which comprises a radial impeller and a follow-up device.
  • the air volume flow to be conveyed usually flows axially into the impeller, which generates an at least partially radially outward air flow, ie an air flow whose flow direction has a radially outward component.
  • the direction of flow when leaving the impeller also has a tangential component directed in the direction of rotation of the impeller.
  • the guide device serves to deflect the air flow generated in a desired direction.
  • the air flow generated is usually deflected such that components of the electric motor flow through and can be cooled.
  • the air flow generated by the impeller is deflected in particular from an obliquely outward, at least partially radial direction into an axial direction, the air flow usually being returned from a periphery of the impeller to the vicinity of the drive axis for cooling the motor becomes.
  • the air flow usually flows out of the fan in the axial direction.
  • the guide device is also used for pressure recovery and is therefore often referred to as a diffuser.
  • a follow-up device for a radial fan is designed as a plate diffuser.
  • a substantially circular plate which is also referred to as a diffuser plate, is arranged parallel to a disk-shaped base plate of the impeller, which is arranged perpendicular to the axis of rotation, at a short distance from the base plate.
  • the impeller is enclosed by a hood which delimits it from the surroundings, with a distance remaining between the hood and the periphery of the impeller.
  • the outer diameter of the diffuser plate is larger than the outer diameter of the impeller, so that there is an annular space between the periphery of the impeller, the diffuser plate and the hood, into which the air flow is conveyed through the blades of the stator.
  • Guide vanes can be arranged in the annular space, which interrupt the annular space and guide the air emerging from the impeller.
  • the annular space can also be empty, a plurality of openings being provided in the diffuser plate through which the air conveyed by the impeller can pass to the side of the diffuser plate opposite the impeller, where means for further guiding the air flow, for example in the axial direction and / or are arranged radially inwards.
  • a motor housing which has a circulation fan mounted on the motor shaft and a deflection means in order to guide the air flow emitted by the fan over the motor.
  • the deflection means has a deflection plate which has a plurality of openings on its outer edge. The openings are delimited by curved wall parts and open into air inlet openings through which the air flow reaches an air chamber on the other side of the diffuser plate. The air inlet openings have an edge against which the air flow flows and which is directed essentially in the radial direction.
  • an essentially disk-shaped diffuser which has openings on its circumference through which the air flow generated by the impeller of the blower can pass to the other side of the diffuser. These openings have a curved edge on their inner side and a flowed edge running essentially in a radial direction.
  • a vacuum cleaner with a blower which comprises a diffuser.
  • a plurality of blades, which guide the air flow conveyed by the impeller, are arranged in an annular space on an outside of the radial impeller.
  • a plate is arranged below the blades and has on its outer edge essentially triangular cutouts through which the air flow reaches the underside of the plate, where it is guided in the direction of the axis of rotation by return blades.
  • the JP 2009299636 A describes an electric blower with a partition plate which is arranged on a rear side of a fan, a diffuser which is arranged on a front side of the partition plate and on an outer peripheral side of the fan.
  • a return is arranged on a rear side of the partition plate, and a fan housing is provided on an opening side of a housing, which covers the fan, the diffuser and the return.
  • the diffuser is provided with a plurality of diffuser wings.
  • a through hole extending from the partition plate is formed on the diffuser wing of at least a part of the plurality of diffuser wings.
  • the JP S5990799 A discloses a vacuum cleaner with curved suction vanes which form helical chambers which are connected via return channels in an electric fan contained in the main body of the vacuum cleaner.
  • the fan has an impeller around which numerous helical chambers are formed.
  • the outer wall of the helical chambers is defined by a curve and tongues that are formed along the curve.
  • the US 2003108442 A1 describes a blower having a rotor with a shaft, a stator coupled to the rotor, and a fan connected to the shaft. Furthermore, a one-piece diffuser is provided with a fan side opposite the motor side, the fan side being connected to the fan, and the diffuser Has openings for transferring the air flow from the fan side to the motor side.
  • a radial fan according to the invention which is designed in particular for use in a vacuum cleaner, preferably in a battery or battery-operated hand-held vacuum cleaner, comprises an impeller which is rotatably mounted about an axis of rotation and can be driven by a motor, in particular an electric motor.
  • the impeller has a plurality of blades that are used to generate a radially outward Airflow are arranged.
  • the blades are preferably arranged obliquely to a radial direction and, when the impeller rotates in a direction of rotation, are curved backwards as seen from the inside outwards.
  • an air flow which is directed at least partially radially outward is thereby generated, which is emitted at a periphery of the impeller into a space adjoining the impeller to the outside.
  • the fact that the air flow is at least partially directed radially outwards means that a direction of flow of the air flow generated has an outward component; due to the entrainment of the air by the blades of the impeller, the direction of flow of the air flow generally also has a tangential component which can exceed the radial amount.
  • the air flow when leaving the impeller can form an angle of less than 30 ° with a tangential direction of the impeller.
  • the air flow generated is in particular formed uniformly along the peripheral surface of the impeller.
  • the air conveyed by the impeller is supplied to the impeller in the axial direction near the axis of rotation.
  • the air flow supplied can be used with a vacuum cleaner to achieve the suction effect.
  • the blades of the impeller can be arranged on a base plate of the impeller or can also be at least partially free.
  • peripheral surface or circumferential surface of the impeller it is meant a substantially cylindrical surface which the radially outer edges of the blades of the impeller produce when the impeller rotates.
  • the radial fan further comprises a follow-up device which serves to deflect the air flow generated by the rotating impeller in an axial direction and which is non-rotatable.
  • the fact that the air flow has an axial direction means that at least one central flow direction of the air flow has an axially directed component;
  • radial and / or tangential components of the flow direction can also be present.
  • the follow-up device is designed as a plate diffuser, which has a diffuser plate arranged in the axial direction adjacent to the impeller, an annular wall surrounding it radially on the outside and a hood that at least partially surrounds the impeller.
  • the diffuser plate is essentially disc-shaped and is preferably arranged in a plane perpendicular to the axis of rotation at a short distance from the impeller, the axis of rotation penetrating the diffuser plate in a central region.
  • the ring wall can be connected to the hood or can be formed in one piece with it.
  • the hood and / or the Ring wall can be part of a housing of the radial fan.
  • the diameter of the diffuser plate is larger than the diameter of the impeller; the ratio of the outer diameter of the impeller to that of the diffuser plate 13 is in particular 0.8 to 0.9.
  • a circumferential continuous annular space is formed between the hood, the impeller and the diffuser plate, into which the generated air flow is conveyed by the impeller.
  • An air flow arises in the annular space, which has an at least partially radially outward flow direction, which can have a tangential component due to the entrainment of the air by the blades of the impeller.
  • the outer edge of the diffuser plate lies at least selectively on the ring wall or is at least selectively connected to it. Between the outer edge of the diffuser plate and the inside of the ring wall, a plurality of openings distributed along the outer circumference of the diffuser plate are formed by recesses in the diffuser plate, which openings allow air to pass from the annular space into a space formed on the side of the diffuser plate opposite the impeller.
  • Guide channels can be arranged in the latter space, through which the air flow is guided in the further course; the guide channels can be formed, for example, by ribs arranged on the diffuser plate and guide the generated air flow radially inward to the vicinity of the axis of rotation, where the air flow can be deflected in the axial direction and then used to cool the motor.
  • the outer edge of the diffuser plate has at least one edge section against which the air flow flows and at least one edge section over which the air flow flows due to the direction of flow of the air flow in the annular space.
  • the flow direction which generally has a radial and a tangential component, is directed toward the edge in a flowed-over edge section, and is directed away from the edge in a flowed over edge section.
  • the outer edge of the diffuser plate can have further edge sections, for example a tangential edge section, which can rest against the ring wall.
  • the side of the diffuser plate facing the impeller is essentially flat, so that the flowed over and the overflowed edge section lie in one plane, namely in the plane of the diffuser plate.
  • the outer edge of the diffuser plate is designed in such a way that at least one, preferably each, flowed edge section at an angle of runs at least 50 ° and at most 65 ° to a radial direction related to the axis of rotation.
  • the at least one flowed-on edge section can in particular form an obtuse angle with an edge section adjoining the inner end of the flowed-on edge section.
  • At least one, preferably each, flowed-in edge section encloses an angle of at least 50 ° and at most 65 ° to a radial direction ensures, in particular, that the flowed-in edge section in no area is perpendicular, even not approximately perpendicular, to the flow direction of the air in the annulus stands. In this way it is achievable that the air is braked to a lesser extent when the flow flows towards the edge section, and thus a higher air volume flow is made possible.
  • the oscillation amplitude of pressure fluctuations which arise when the edge flows against the air volume flow pulsating due to the blading of the impeller and which contribute significantly to the sound level generated by the blower can be reduced if the mentioned angular range of the inflow edge is maintained.
  • the design according to the invention thus creates a radial fan, in which an improved aerodynamic efficiency and / or a reduction in noise emission is made possible, in particular in a work area of a vacuum cleaner.
  • the at least one or each flowed edge section forms an angle of at least 50 ° and at most 60 °, particularly preferably of approximately 55 °, with a radial direction. This enables a particularly high efficiency and / or a particularly low sound level.
  • the at least one flowed-on edge section is curved and encloses an angle of at least 50 ° and at most 65 ° with a radial direction related to the axis of rotation.
  • Exactly one flowed edge section is preferably provided, and this is concavely curved, a straight connecting line between a radially outer and a radially inner end point of the flowed edge section forming an angle of approximately 65 ° with a radial direction.
  • the flow toward the edge section is designed to be concavely curved in such a way that the surface of the area delimited by it.
  • the opening of the diffuser plate is equal to the area of such an opening, which is delimited by an edge section that has just been flown against and has the same outer end point and encloses an angle of 55 ° with a radial direction.
  • each opening has only a flowed-on edge section, each opening being assigned a guide channel formed on the side of the diffuser plate opposite the impeller, which is formed by an inner wall and an outer wall, and which has an inner wall at an inner end point and an outer wall adjoins an outer end point of one of the flowed edge sections.
  • the edge section against which flow flows covers the guide channel.
  • the inner wall and the outer wall can be designed as ribs of the diffuser plate, one rib being the outer wall of one guide channel and the inner wall of an adjacent guide channel.
  • the guide channels can be open on the side facing away from the diffuser plate or at least partially closed off by a base.
  • the guide channels serve to guide the air flow generated, in particular in an obliquely inward direction, ie with a flow direction with a radially inward and a tangential component. Characterized in that the guide channel assigned to an opening in each case adjoins the flow of the edge section, a maximum cross-sectional area of the guide channel and thereby a particularly high efficiency of the fan is made possible.
  • each opening has only one edge section overflowed, the inner end point of the flowed edge section coinciding with the inner endpoint of the overflowed edge section.
  • a continuation of the inner wall of the guide channel and from the outer end point of the overflowed edge section to the entry opening into the guide channel is preferably arranged along the overflowed edge section an inclined descending ramp.
  • the end of the inclined ramp can define an entry opening into the guide channel together with the adjoining regions of the inner wall and the outer wall of the guide channel, as well as with the flowed-on edge section.
  • the direction of flow of the air flow entering through the inlet opening also has an axial component. This enables a particularly efficient guidance of the air flow.
  • the inlet opening extends in the direction of the axis of rotation beyond the radius of the impeller; in other words, the inlet opening and the impeller overlap when the radial fan is viewed in the direction of the axis of rotation.
  • This can be achieved in that the inner wall of the guide channel at the location of the inlet opening has a smaller distance from the axis of rotation than the outer edge of the impeller.
  • the ratio between the distance of the limit of the inlet opening on the axis of rotation from the axis of rotation and the radius of the impeller is preferably less than 0.95, particularly preferably less than 0.9.
  • the ratio between the distance of the inlet opening from the axis of rotation from the axis of rotation and the radius of the impeller is preferably more than 0.75, particularly preferably more than 0.8, for example 0.83.
  • a not too small distance between the boundary of the inlet opening on the axis of rotation and the axis of rotation can ensure pressure recovery in the region of the radial fan downstream of the inlet opening.
  • the at least one overflowed edge section is arranged at least in sections obliquely to a radial direction related to the axis of rotation, in particular at an angle of at least 50 ° to the radial direction.
  • an edge vortex can arise on an overflowed edge, which can also represent a sound source.
  • the edge vortex can hinder the free flow out of the impeller and thus also adversely affect the efficiency of the fan. Due to the fact that the overflowed edge section is oriented obliquely to the radial direction, the formation of such an edge vortex is reduced or suppressed, as a result of which the efficiency can be further increased and the sound power level can be further reduced.
  • the overflowed edge section is advantageously at least sectionally arched, in particular in such a way that the center of curvature of the curvature of the overflowed edge section is arranged radially within, but offset from the axis of rotation.
  • the overflowed edge section can also be straight in sections. In both cases, it is advantageous that the overflowed edge section forms an angle of at least 50 ° and at most 90 ° to a radial direction in each section. If the overflowed edge section comprises a section in the form of a circular arc with the axis of rotation as the center, it is advantageous that one or each further section of the overflowed edge section encloses an angle of at least 50 ° and at most 90 ° to a radial direction. This enables a particularly loss-free and low-noise overflow.
  • the outer edge of the diffuser plate is designed in such a way that the at least one overflowed edge section has a section which is designed as an arc, the center of which lies on the axis of rotation, and thus as a tangential section.
  • One or more further sections of the overflowed edge section can run at an angle to a tangential direction. Due to the fact that the at least one edge section overflowed has a partial section shaped as a circular arc with the axis of rotation as the center, a particularly large cross section of the passage openings through which the air flow flows and thus a high aerodynamic efficiency can be achieved, while a generated sound power level remains at a low level.
  • the plurality of openings are distributed uniformly around the circumference of the diffuser plate and in particular each have the same shape and size. This enables a simplification of the production as well as a particularly uniform air flow.
  • the outer end point of the flowed edge section of a first opening is adjacent to or corresponds to the outer end point of the flowed edge section of a second opening.
  • This preferably applies to each opening, so that the openings connect to one another almost without gaps and occupy practically the entire outer circumference of the diffuser plate; a contact with the ring wall, which delimits the opening to the outside, is therefore only selective, namely at the outer end points of the flowed or overflowed edge sections.
  • the openings are arranged outside the surface of the diffuser plate which is swept by the blades of the impeller.
  • the overflowed edge section has a partial section designed as a circular arc with a center lying on the axis of rotation, it is particularly advantageous that the circular arc has a radius which corresponds approximately to the outer radius of the impeller. This not only enables maximum use of the passage area of the openings, but also more efficient guidance of the air flow.
  • the diffuser plate is formed in one piece with the ring wall or the diffuser plate and the ring wall are connected using a suitable joining method, for example ultrasound welding or adhesive bonding.
  • the diffuser plate together with the Ring wall thus represents a deflecting body, which deflects the air flow from the annular space for further use in the axial direction and, if appropriate, radially inwards.
  • the deflection body, such as the impeller and the hood, are preferably made of plastic. This enables particularly simple manufacture and / or assembly.
  • FIG. 1 A radial blower 1 is shown in an axial longitudinal section, for example suitable for a battery-operated hand-held vacuum cleaner, which comprises an impeller 2, a follow-up device 3 and an electric motor 4.
  • the impeller 2 consists of a disk-shaped base plate 5 and a likewise disk-shaped cover plate 6, which is slightly curved in the central area, between which a plurality of blades 7 are arranged.
  • the impeller 2 is rotatably supported and is driven by the electric motor 4 via a shaft 8.
  • the axis of rotation of the shaft 8 or the impeller 2 is in Fig. 1 marked with the reference number 9.
  • the engine includes, as in Fig. 1 is shown symbolically, a stator 10 and a rotor 11 connected to the shaft 8 and has a plurality of windings 12 through which the drive current of the electric motor flows.
  • the follow-up device 3 is designed as a plate diffuser and comprises a circular diffuser plate 13 which has a substantially flat upper side and is arranged parallel to the base plate 5 of the impeller 2 at a short distance below it.
  • the outer diameter of the diffuser plate 13 is larger than the outer diameter of the impeller 2.
  • the diffuser plate 13 is connected to a short cylindrical ring wall 14.
  • the diffuser plate 13 has on its underside a plurality of ribs 15, which form downwardly open guide channels 16 through which one through in Fig. 1 Air passage openings, not shown, are guided radially inward through the diffuser plate 13.
  • inclined ramps 43 are arranged below the air passage openings, which guide the air passing through the openings into the guide channels 16.
  • the diffuser plate 13 has a bevel 18 for further deflecting the air flow in a radial direction.
  • the Radial fan also has a housing 19, which consists of a lower housing part 20, a hood 21 and a suction flange 22 and, if appropriate, further, in Fig. 1 components not shown.
  • the diffuser plate 13 with the ring wall 14 is arranged in a fixed manner in the housing 19.
  • the hood 21 encloses the impeller 2 and partially the diffuser plate 13 and the ring wall 14, an annular space 23 being formed between the periphery, ie the outer peripheral surface of the impeller 2, the top of the diffuser plate 13 and the inside of the hood 21.
  • the annular space 23 is continuous along the circumference of the impeller 2 and does not itself contain any flow-guiding elements.
  • the impeller 2 If the impeller 2 is rotated by the electric motor 4 via the shaft 8 in a predetermined direction of rotation indicated by the arrow 24, the impeller 2 generates an at least partially radially outward air flow with the help of the blades 7, as in FIG Fig. 1 is indicated by the arrows.
  • air is sucked in along the axis of rotation 9 through the suction flange 22, which in a vacuum cleaner can be connected, for example, to a suction hose.
  • the air conveyed to the outside first enters the annular space 23, where, due to the entrainment by the blades 7, it also executes a movement directed tangentially to the axis of rotation 9.
  • the air flow generated passes via the ramp 43 into the space below the diffuser plate 13 and into the guide channels 16, through which it is guided radially inward while maintaining a tangential component.
  • the air flow is deflected further in the axial direction by the bevel 18 and reaches the electric motor 4, where it can be used for cooling the windings 12.
  • the air flow finally reaches the outer region of the blower 1 through outlet openings 25.
  • the radial and the axial components of the flow direction of the air flow generated are in FIG Fig. 1 to recognize the sectional view shown with the arrows.
  • FIGs 2 and 3rd are in a perspective view of the impeller 2 according Fig. 1 and a follow-up device 31 designed according to the invention is shown in a perspective view, the hood 21 having been omitted for reasons of illustration.
  • the impeller 2 has a base plate 5 and a cover plate 6, between which several, for example 13, standing vertically, arcuately curved blades 7 are arranged.
  • the blades 7 are arranged at the same angular distance from one another and overlap one another, with each blade covering an angle of approximately 50 ° as seen from the axis of rotation.
  • the cover plate 6 has a central cutout 26, which allows air to flow axially into the central region of the impeller 2.
  • a bore 27 is made in the base plate 5, into which the shaft 8 connected to the rotor 11 of the electric motor 4 can be inserted for driving the impeller 2 and connected to the impeller 2 (see FIG. Fig. 1 ). If the impeller 2 is moved in the predetermined direction of rotation, the obliquely positioned, backward-curved blades 7 generate an obliquely outwardly directed air flow.
  • the diffuser plate 32 is arranged below the base plate 5 and parallel to it, the outer edge of which defines a plurality of openings 33 with the annular wall 14. The air flow exits through the openings 33 from the annular space adjoining the impeller 2 on the outside Fig. 2 Hood 21, not shown, is limited (s. Fig. 1 ) in the space below the diffuser plate 32. There the air flow becomes like Fig. 1 explained, guided radially inwards and finally deflected again in the axial direction.
  • each opening 33 is delimited by the inner wall of the short cylindrical ring wall 14.
  • Each opening 33 is delimited on the inside by an edge section 34 and an overflow edge section 35 of the outer edge of the diffuser plate 32. Neither the flowed edge section 34 nor the flowed over edge section 35 run in the radial direction.
  • the opening 33 has approximately the shape of an obtuse-angled isosceles triangle, the side which is defined by the annular wall 14 and the side which is formed by the overflowed edge section 35 each being curved in an arc shape with an outwardly directed bulge.
  • the flow toward the edge section 34 is essentially straight.
  • the radial fan according to the first embodiment of the invention is the same as before Figures 1 and 2nd explained.
  • the impeller 2 is configured as described above and is arranged adjacent to the upper side of the diffuser plate 32.
  • the diffuser plate 32 has a central bore 36 for the passage of the shaft 8 for driving the impeller 2.
  • the diffuser plate 32 according to Fig. 3 is in Fig. 4 together with the impeller 2 again shown schematically in plan view.
  • the shaft 8 is fastened to drive the impeller 2.
  • the oblique, backward-curved blades 7 are on the base plate 5.
  • the base plate 5 covers the central region of the diffuser plate 32.
  • the ratio of the outer diameter D of the base plate 5 or of the impeller 2 to the outer diameter D 'of the diffuser plate 32 is approximately 0.88 .
  • By arrows 37 is in Fig. 4 the direction of flow of the air conveyed by the impeller 2 is indicated relative to the impeller 2.
  • the cover plate 6 of the impeller 2 (s. Fig. 1 and 2nd ) is in Fig. 4 not shown.
  • the diffuser plate 32 has recesses on the edge which, together with the ring wall 14, form a plurality of openings 33; for clarification, one of the openings 33 in Fig. 4 indicated by hatching.
  • the openings 33 are delimited by the ring wall 14.
  • the openings 33 are delimited by the outer edge of the diffuser plate, which in the area of the openings has an edge section 34 and an overflowed edge section 35.
  • the openings 33 are not covered by the impeller 2, that is to say the distance of the openings 33 from the axis of rotation is at least as large as the radius of the impeller 2.
  • the edge section 34 that is flown against is straight, while the edge section 35 that is overflowed is curved in a convex shape.
  • the overflowed edge section 35 forms an angle ⁇ of more than 50 ° and less than 90 ° in each point with a radial direction; in Fig. 4 the angle ⁇ is entered between a respective tangent to the overflowed edge section 35 and a respective radial direction in the inner end point 39 and in the outer endpoint 40 of the overflowed edge section 35.
  • the arrows 38 show the direction of flow of the air flow conveyed by the impeller 2 in the annular space outside the impeller 2 and above the diffuser plate 32 relative to the latter. When leaving the impeller 2, the direction of flow of the air has an angle of less than 30 ° to a tangential direction.
  • the outer end point 40 of the flow edge of an adjacent opening 33 and the flow edge 35 coincide.
  • a diffuser plate 48 according to a second embodiment of the invention is shown together with the impeller 2 in a simplified plan view.
  • This diffuser plate 48 like that in FIGS Figures 3 and 4th shown diffuser plate 32 in the radial fan according to Fig. 1 are used, so that a radial fan equipped with the diffuser plate 48 corresponds to the second exemplary embodiment of the invention.
  • the overflowed edge section 49 is formed with two sections 46, 47.
  • a first section 46 of the overflowed edge section 49 adjoins the flowed-over edge section 29, the first section 46 having the shape of an arc, the center of which lies in the center of the diffuser plate 48, ie on the axis of rotation of the impeller 2 or in the center of the central bore 36 (s. Fig. 3 ).
  • the radius of the circular arc corresponds to the radius of the impeller 2, so that the first section 46 comes to lie approximately in an extension of the peripheral surface of the impeller 2.
  • a second section 47 of the overflowed edge section 30 is arc-shaped and forms an angle ⁇ of between 50 ° and 90 ° with a radial direction, in the illustrated example of approximately 80 °, ie with an tangential direction an angle of approximately 10 °.
  • a radial direction in the illustrated example of approximately 80 °, ie with an tangential direction an angle of approximately 10 °.
  • the diffuser plate 48 is like that with respect to the flow against the edge section 34 and for the rest Fig. 3 and 4th Diffuser plate 32 described formed, the reference numerals have the same meaning.
  • the direction of flow of an air flow guided in a guide channel 16 below the diffuser plate 48 is shown in FIG Fig. 5 indicated by the dashed arrows 41.
  • FIG Fig. 6 The passage of the air flow through the diffuser plate 32 is shown in FIG Fig. 6 shown, partially sectioned side view.
  • the air flow indicated by the arrows 42 passes from the annular space 23 through the in Fig. 6 not shown opening 33 (s. Fig. 3 , 4th ) in the space below the diffuser plate 32.
  • the air flow is guided through an inclined ramp 43, which begins at the outer end point 40 of the overflowed edge 35 (see. Fig. 4 ). Laterally, the air flow in this area is guided on the one hand through the ring wall 14 and on the other hand through a vertical side wall 44 which runs along the overflowed edge 35 or is slightly offset inwards.
  • the air flow then passes through the inlet opening 45, which is formed between the diffuser plate 32 in the area of the flowed edge section 34 and the end of the ramp 43 and is at a slight angle to an axial direction, into the space below the diffuser plate 32, where a guide channel 16 for further guiding the air serves (in Fig. 6 Not shown).
  • a guide channel 16 for further guiding the air serves (in Fig. 6 Not shown).
  • Fig. 6 there are two entry openings in Fig. 6 shown hatched.
  • the air flow passes through the diffuser plate 48 in a corresponding manner as in FIG Fig. 6 for the first embodiment (see Fig. 3 , 4th ).
  • the outer side wall 44 of the rib 15 has a smaller distance from the axis of rotation than the outer edge of the impeller 2.
  • the inlet opening 45 extends in the direction of the axis of rotation 9 beyond the radius of the impeller 2, so that inlet opening 45 and Cover impeller 2.
  • the ratio between the distance between the boundary of the inlet opening 45 on the axis of rotation and the axis of rotation 9 and the radius of the impeller 2 is 0.83.

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

Claims (12)

  1. Ventilateur radial, notamment pour un aspirateur, comprenant une roue mobile (2) rotative autour d'un axe de rotation (9), entraînable par un moteur, laquelle présente une pluralité de pales (7) destinées à générer un flux d'air orienté au moins en partie radialement vers l'extérieur, et comprenant un dispositif diffuseur (31) stationnaire qui présente une plaque de diffuseur (13, 32, 48) disposée axialement de manière avoisinante à la roue mobile (2), perpendiculairement à l'axe de rotation (9), comprenant une paroi annulaire (14) entourant la plaque de diffuseur radialement de manière extérieure, et un capot (21) entourant au moins en partie la roue mobile (2), un espace annulaire (23) continu, entourant la roue mobile (2) radialement de manière extérieure étant formé entre le capot (21), la roue mobile (2) et la plaque de diffuseur (13, 32, 48), une pluralité d'ouvertures (33, 50) étant réalisées entre une arête extérieure de la plaque de diffuseur (13, 32, 48) et la paroi annulaire (14), lesquelles permettent un passage d'air de l'espace annulaire (23) vers le côté de la plaque de diffuseur (13, 32, 48) opposé à la roue mobile (2), et l'arête extérieure de la plaque de diffuseur (13, 32, 48) présentant dans la partie de chaque ouverture (33, 50) au moins une section d'arête (34) insufflée et au moins une section d'arête (35, 49) submergée, caractérisé en ce que l'au moins une section d'arête (34) insufflée comprend un angle γ d'au moins 50° et de maximum 65° avec une direction radiale et est réalisée de manière courbée.
  2. Ventilateur radial selon la revendication 1, caractérisé en ce que l'au moins une section d'arête (34) insufflée comprend un angle γ d'au moins 50° et de maximum 60° avec une direction radiale, de préférence un angle γ d'environ 55°.
  3. Ventilateur radial selon la revendication 1 ou 2, caractérisé en ce que l'au moins une section d'arête (34) insufflée est réalisée avec courbure concave, une ligne de liaison rectiligne entre un point terminal extérieur et un point terminal intérieur comprenant un angle γ d'environ 65° avec une direction radiale, et l'ouverture (33, 50) présentant une surface aussi grande qu'une ouverture ayant une section d'arête (34) insufflée réalisée de manière rectiligne qui comprend un angle γ égal à 55° avec une direction radiale.
  4. Ventilateur radial selon l'une quelconque des revendications précédentes, caractérisé en ce que chaque ouverture (33, 50) présente exactement une section d'arête (34) insufflée et en ce qu'un canal de guidage (16) disposé sur le côté de la plaque de diffuseur (13, 32, 48) opposé à la roue mobile (2) est associé à chaque ouverture (33, 50), une paroi intérieure du canal de guidage (16) se raccordant à un point terminal (39) intérieur et une paroi extérieure du canal de guidage (16) se raccordant à un point terminal extérieur de la section d'arête (34) insufflée.
  5. Ventilateur radial selon l'une quelconque des revendications précédentes, caractérisé en ce que chaque ouverture (33, 50) présente exactement une section d'arête (35, 49) submergée, le point terminal (39) intérieur de la section d'arête (34) insufflée coïncidant avec le point terminal (39) intérieur de la section d'arête (35, 49) submergée, et un prolongement de la paroi intérieure du canal de guidage (16) étant disposé le long de la section d'arête (35, 49) submergée et une rampe oblique (43) étant disposée du point terminal extérieur de la section d'arête (35, 49) submergée jusqu'à l'ouverture d'entrée (45) dans le canal de guidage (16).
  6. Ventilateur radial selon l'une quelconque des revendications précédentes, caractérisé en ce que l'au moins une section d'arête (35, 49) submergée s'étend de manière oblique vers une direction radiale au moins dans une section partielle (47), notamment en ce qu'elle comprend un angle θ d'au moins 50° avec une direction radiale.
  7. Ventilateur radial selon l'une quelconque des revendications précédentes, caractérisé en ce que l'au moins une section d'arête (35, 49) submergée est réalisée en forme d'arc au moins dans une section partielle (46, 47).
  8. Ventilateur radial selon la revendication 7, caractérisé en ce que l'au moins une section d'arête (49) submergée présente une section partielle (46) qui est réalisée comme arc de cercle dont le centre est situé sur l'axe de rotation (9).
  9. Ventilateur radial selon l'une quelconque des revendications précédentes, caractérisé en ce que la pluralité d'ouvertures (33, 50) sont réparties de manière régulière le long de la circonférence de la plaque de diffuseur (13, 32, 48).
  10. Ventilateur radial selon l'une quelconque des revendications précédentes, caractérisé en ce que le point terminal extérieur d'une section d'arête (34) insufflée d'une ouverture (33, 50) est voisin au point terminal extérieur d'une section d'arête (35, 49) submergée d'une ouverture voisine (33, 50) ou coïncide avec celui-ci.
  11. Ventilateur radial selon l'une quelconque des revendications précédentes, caractérisé en ce que les ouvertures (33, 50) sont disposées à l'extérieur de la surface de la plaque de diffuseur (13, 32, 48) balayée par les pales (7) de la roue mobile (2).
  12. Ventilateur radial selon l'une quelconque des revendications précédentes, caractérisé en ce que la plaque de diffuseur (13, 32, 48) est réalisée d'une seule pièce avec la paroi annulaire (14) ou est assemblée avec celle-ci et forme ainsi un corps de déviation.
EP15163971.3A 2014-04-30 2015-04-17 Ventilateur radial présentant une géométrie de bord d'attaque améliorée Active EP2940311B1 (fr)

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DE102014208127.0A DE102014208127A1 (de) 2014-04-30 2014-04-30 Radialgebläse mit verbesserter Anströmkantengeometrie

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CN107401517B (zh) * 2016-05-20 2023-12-05 阿美德格工业技术（上海）有限公司 使空气流动装置的风路结构及使空气流动装置
CN111765123A (zh) * 2019-04-01 2020-10-13 博西华电器（江苏）有限公司 吸油烟机的风机及吸油烟机
CN114704479B (zh) * 2022-04-12 2023-11-28 中国科学院空天信息创新研究院 一种用于平流层的离心风机
CN115681213A (zh) * 2022-11-22 2023-02-03 广东美的白色家电技术创新中心有限公司 组装电风机的方法
CN115788962A (zh) * 2022-11-22 2023-03-14 广东美的白色家电技术创新中心有限公司 电风机和终端设备

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JPS5990799A (ja) * 1982-11-16 1984-05-25 Matsushita Electric Ind Co Ltd 電気掃除機
US5734214A (en) 1995-11-09 1998-03-31 Ametek, Inc. Molded through-flow motor assembly
JP3775542B2 (ja) 1998-01-29 2006-05-17 東芝テック株式会社 電動送風機
US6648613B2 (en) * 2001-12-11 2003-11-18 Ametek, Inc. Fan blower assembly with one-piece air diffuser and bayonet-style end cap
JP4596995B2 (ja) 2005-06-24 2010-12-15 日立アプライアンス株式会社 電動送風機及びこれを備えた電気掃除機
JP4729599B2 (ja) * 2008-06-17 2011-07-20 日立アプライアンス株式会社 電動送風機及びこれを備えた電気掃除機

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