EP2940311A1 - Ventilateur radial présentant une géométrie de bord d'attaque améliorée - Google Patents

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

Info

Publication number: EP2940311A1
Authority: EP; European Patent Office
Prior art keywords: impeller; edge portion; diffuser plate; radial fan; overflowed
Prior art date: 2014-04-30
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.): Granted

Application number

EP15163971.3A

Other languages

German (de)

English (en)

Other versions

EP2940311B1 (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

Original Assignee

BSH Hausgeraete 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.)

2014-04-30

Filing date

2015-04-17

Publication date

2015-11-04

2015-04-17 Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH

2015-11-04 Publication of EP2940311A1 publication Critical patent/EP2940311A1/fr

2020-07-01 Application granted granted Critical

2020-07-01 Publication of EP2940311B1 publication Critical patent/EP2940311B1/fr

Status Active legal-status Critical Current

2035-04-17 Anticipated expiration legal-status Critical

Images

Classifications

- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- 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 fan, in particular a radial fan for a vacuum cleaner, which comprises a rotatable about a rotation axis, driven by a motor impeller having a plurality of blades for generating an at least partially radially outward air flow, and a fixed Nachleit wisdom, the a perpendicular to the rotational axis axially adjacent to the impeller arranged diffuser plate, this radially outwardly surrounding annular wall and the impeller at least partially enclosing hood, wherein between the hood, the impeller and the diffuser plate, the impeller radially outer surrounding, continuous annular space is formed.
Vacuum cleaners usually use radial fans.
a radial fan comprises a drive motor, in particular an electric motor, and an aerodynamic device, which comprises a radial impeller and a guide device.
the air volume flow to be conveyed flows axially into the impeller, which generates an air flow directed at least partially radially outward, ie an air flow whose flow direction has a component directed radially outward.
the flow direction when leaving the impeller also has a directed in the direction of rotation of the impeller tangential component.
the Nachleit wisdom serves to deflect the generated air flow in a desired direction. Since the electric drive motor must be cooled as a rule, the generated air flow is usually deflected so that flows through components of the electric motor and can be cooled. In the Nachleit boots therefore takes place in particular a deflection of the air flow generated by the impeller of an obliquely outwardly directed, at least partially radial direction in an axial direction, usually being returned to the cooling of the engine, the air flow from a periphery of the impeller in the vicinity of the drive axle becomes. In the course of the air flow usually flows out of the fan in the axial direction.
the Nachleit Anlagen also serves the pressure recovery and is therefore often referred to as a diffuser.
a Nachleit adopted for a radial fan is designed as a plate diffuser.
a substantially circular plate is arranged parallel to a disc-shaped base plate of the impeller, which is arranged perpendicular to the axis of rotation, at a small distance to the base plate, which is also referred to as a diffuser plate.
the impeller is enclosed by a hood, which delimits it against the environment, leaving a gap 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 between the periphery of the impeller, the diffuser plate and the hood results in an annular space in which the air flow is conveyed through the blades of the stator.
the annulus guide vanes may be arranged, which interrupt the annulus and lead the exiting air from the impeller. But the annulus can also be empty, wherein in the diffuser plate a plurality of openings is provided, through which the air conveyed by the impeller can pass to the impeller opposite side of the diffuser plate, where means for further guidance of the air flow, for example in the axial direction and / or arranged radially inward.
a motor housing which has a circulation fan mounted on the motor shaft and a deflecting means to guide the air flow emitted by the fan via the motor.
the deflection means has a baffle plate which has a plurality of openings at its outer edge. The openings are bounded by curved wall parts and open into air inlet openings, through which the air flow passes into an air chamber on the other side of the diffuser plate.
the air inlet openings have an edge streamed by the air flow, which is directed essentially in the radial direction.
a substantially disc-shaped diffuser which has openings at 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 on their inside a curved edge and a substantially in a radial direction flowing against edge.
a vacuum cleaner with a blower which comprises a diffuser.
a plurality of blades are arranged in an annular space, which guide the air flow conveyed by the impeller.
a plate is arranged, which has at its outer edge substantially triangular recesses through which the air flow reaches the bottom of the plate, where it is guided by return vanes in the direction of the axis of rotation.
An inventive radial fan which is designed in particular for use in a vacuum cleaner, preferably in a battery or battery-operated hand vacuum cleaner, comprises an impeller which is rotatably mounted about a rotation axis and by a motor, in particular an electric motor driven.
the impeller has a plurality of blades which are for generating a radially outward Air flow are arranged.
the blades are preferably arranged obliquely to a radial direction and curved backward when the impeller rotates in a direction of rotation from the inside to the outside.
an air flow directed at least partially radially outwards is thereby produced, which is discharged 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 here that a flow direction of the generated air flow has an outwardly directed 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 may exceed the radial magnitude.
the air flow can form an angle of less than 30 ° when leaving the impeller with a tangential direction of the impeller.
the generated air flow is uniform in particular along the peripheral surface of the impeller.
the air conveyed by the impeller is fed to the impeller in the axial direction in the vicinity of the axis of rotation.
the supplied air flow can be used in a vacuum cleaner to achieve the suction effect.
the blades of the impeller may be arranged on a base disk of the impeller or at least partially free.
the term "periphery” or “peripheral surface” of the impeller refers to a substantially cylindrical surface that produces the radially outer edges of the blades of the impeller upon rotation of the impeller.
the radial fan further comprises a guide device, which serves for deflecting the air flow generated by the rotating impeller in an axial direction and which is not rotatable. That the air flow has an axial direction means in this case that at least one mean flow direction of the air flow has an axially directed component; In addition, radial and / or tangential components of the flow direction may also be present.
the guide device is designed as a plate diffuser, which has a diffuser plate arranged adjacent to the impeller in the axial direction, an annular wall surrounding the latter radially on the outside, and a hood which at least partially surrounds the impeller.
the diffuser plate is substantially disc-shaped and preferably arranged in a plane perpendicular to the rotation axis at a small distance from the impeller, wherein the axis of rotation pierces the diffuser plate in a central region.
the annular wall may be connected to the hood or formed integrally therewith.
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.
the diffuser plate lies with its outer edge at least at points on the annular wall or is at least selectively connected thereto. Between the outer edge of the diffuser plate and the inside of the annular wall is formed by recesses of the diffuser plate a plurality of distributed along the outer periphery of the diffuser plate openings which allow air to pass from the annular space in a space formed on the opposite side of the impeller of the diffuser plate.
space guide channels can be arranged, through which the air flow is guided in the course; the guide channels can be formed for example by arranged on the diffuser plate ribs and the generated air flow radially inwardly 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 engine.
the outer edge of the diffuser plate due to the flow direction of the air flow prevailing in the annular space, has at least one edge section which is streamed by the air flow and at least one edge section which is overflowed by the air flow.
the flow direction which typically has a radial and a tangential component, is directed against the edge and directed away from the edge in an overflowed edge portion.
the outer edge of the diffuser plate may have further edge portions, for example, a tangential edge portion which may abut the annular wall.
the side facing the impeller of the diffuser plate is substantially flat, so that the flowed and the overflowed edge portion lie in a plane, namely in the plane of the diffuser plate.
the outer edge of the diffuser plate is designed such that at least one, preferably each streamed edge portion at an angle of at least 50 ° and at most 65 ° to a radial axis relative to the axis of rotation.
the at least one flowed-on edge section can form an obtuse angle, in particular with an edge section adjoining the inner end of the flowed-on edge section.
each inflowing edge section encloses an angle of at least 50 ° and at most 65 ° to a radial direction, it can be ensured in particular that the flowed-on edge section is not perpendicular, even not approximately perpendicular, to the flow direction of the air in any area the annulus stands. As a result, it can be achieved that the air is slowed down to a lesser extent when flowing against the flowed-on edge section and thus a higher air volume flow is made possible.
the at least one or each flowed edge portion forms an angle of at least 50 ° and at most 60 °, more preferably of about 55 ° with a radial direction. This allows a particularly high efficiency and / or a particularly low sound level.
the at least one streamlined edge portion is substantially straight. This allows for a particularly simple embodiment high efficiency at a low sound power level.
the at least one flowed-on edge portion is curved or sectionally straight and includes an angle of at least 50 ° and at most 65 ° with a radial direction relative to the rotation axis.
exactly one impinged edge portion is provided, and this is formed concavely curved, wherein a straight connecting line between a radially outer and a radially inner end point of the flowed edge portion forms an angle of about 65 ° with a radial direction.
the flowed-on edge portion is concavely curved such that the area of the opening of the diffuser plate bounded by this is equal to the area of such an opening formed by a straight-edged straight edge portion having the same outer end point and a radial direction Angle of 55 ° is limited.
a particularly high efficiency and / or a particularly low sound level can also be achieved.
each aperture has only one flowed-on edge portion, each aperture being associated with a guide channel formed on the opposite side of the diffuser plate from the impeller, formed by an inner wall and an outer wall, and with its inner wall at an inner end point and with its outer wall connects to an outer end point of a flowed edge portion.
the streamlined edge portion thus covers the guide channel.
the inner wall and the outer wall may be formed as ribs of the diffuser plate, wherein one rib at a time is the outer wall of a 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 by a bottom.
the guide channels serve to guide the generated air flow, in particular in an obliquely inward direction, ie with a flow direction with a radially inwardly directed and a tangential component.
a maximum cross-sectional area of the guide channel and thus a particularly high efficiency of the fan is made possible.
each opening has only one overflowed edge section, wherein the inner end point of the flowed edge section coincides with the inner end point of the overflowed edge section.
an inclined ramp descending into the guide channel is arranged along the overflowed edge portion.
the flow direction of the air flow entering through the inlet opening also has an axial component. This allows a particularly efficient management 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 each other when the radial fan is viewed in the direction of the axis of rotation.
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 largest possible volume flow through the inlet opening is advantageously achievable.
the ratio between the distance of the rotation axis-side boundary of the inlet opening from the axis of rotation and the radius of the impeller is less than 0.95, particularly preferably less than 0.9.
the ratio between the distance of the rotation axis-side boundary of the inlet opening from the axis of rotation and the radius of the impeller is more than 0.75, particularly preferably more than 0.8, for example 0.83.
a not too small distance of the rotation axis-side boundary of the inlet opening from the axis of rotation can ensure pressure recovery in the inlet opening downstream region of the radial fan.
the at least one overflowed edge portion is arranged at least in sections obliquely to a radial direction relative to the axis of rotation, in particular at an angle of at least 50 ° to the radial direction.
an edge vortex can arise at an overflowed edge, which can also represent a sound source.
the edge vortex obstruct the free outflow from the impeller and thus adversely affect the efficiency of the fan.
the overflowed edge portion is oriented obliquely to the radial direction, the formation of such eddy vortex is reduced or suppressed, whereby the efficiency can be further increased and the sound power level can be further reduced.
the overflowed edge portion is at least partially arcuate, in particular in an arcuate manner in such a way that the center of curvature of the curvature of the overflowed edge portion is arranged radially inside, but offset from the axis of rotation.
the overflowed edge portion may also be formed straight in sections. In both cases, it is advantageous that the overflowed edge portion in each section forms an angle of at least 50 ° and a maximum of 90 ° to a radial direction.
the overflowed edge section comprises a partial section in the form of a circular arc with the axis of rotation as the center, it is advantageous that one or each further partial section of the overflowed edge section forms an angle of at least 50 ° and at most 90 ° to a radial direction. As a result, a particularly lossless and low-noise overflow is possible.
the outer edge of the diffuser plate is formed such that the at least one overflowed edge portion has a portion which is formed as a circular arc whose center lies on the axis of rotation, and thus as a tangentially extending portion.
One or more further sections of the overflowed edge section may extend at an angle to a tangential direction. Due to the fact that the at least one overflowed edge section has a section formed as a circular arc with the axis of rotation as the center point, a particularly large cross section of the passage openings through which the air stream flows and thus a high aerodynamic efficiency can be achieved can be achieved, but a generated sound power level remains at a low level.
the plurality of openings are distributed uniformly on the circumference of the diffuser plate and in particular each have the same shape and size. As a result, a simplification of the production as well as a particularly uniform air flow are made possible.
the outer end point of the flowed edge portion of a first opening adjacent to the outer end point of the overflowed edge portion of a second opening or coincides with this.
the openings are arranged outside the surface of the diffuser plate swept by the blades of the impeller. This means that the inner end point of the flowed as well as the overflowed edge portion are at a greater or equal distance from the axis of rotation than corresponds to the radius of rotation of the outer ends of the blades of the impeller. If the overflowed edge portion has a section formed as a circular arc with a center lying on the axis of rotation part section, it is particularly advantageous that the circular arc has a radius which corresponds approximately to the outer radius of the impeller. This not only allows maximum use of the passage area of the openings, but also a more efficient guidance of the air flow.
the diffuser plate is integrally formed with the annular wall or the diffuser plate and the annular wall are connected by a suitable joining method, such as ultrasonic welding or gluing.
the diffuser plate is in common 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 possibly radially inwardly.
the deflecting body such as the impeller and the hood, are preferably made of plastic.
Fig. 1 is an axial longitudinal section, for example, a suitable for a battery-powered hand-held vacuum cleaner radial fan 1 shown, comprising an impeller 2, a Nachleit Vintage 3 and an electric motor 4.
the impeller 2 consists of a disk-shaped base plate 5 and a likewise disk-shaped, in the central region slightly high-curved cover plate 6, between which a plurality of blades 7 is arranged.
the impeller 2 is rotatably mounted and is driven by the electric motor 4 via a shaft 8.
the axis of rotation of the shaft 8 and the impeller 2 is in Fig. 1 designated by the reference numeral 9.
the engine includes, as in Fig. 1 is symbolically shown, a stator 10 and connected to the shaft 8 rotor 11 and has a plurality of windings 12, which are traversed by the drive current of the electric motor.
the guide 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 small distance below it.
the outer diameter of the diffuser plate 13 is greater than the outer diameter of the impeller 2.
the diffuser plate 13 is connected to a short cylindrical annular wall 14.
the diffuser plate 13 on its underside on a plurality of ribs 15 which form downwardly open guide channels 16, through which a through in Fig. 1 not shown air passage openings through the diffuser plate 13 passed air flow is guided radially inwardly.
oblique ramps 43 are arranged below the air passage openings, which lead the air passing through the openings in the guide channels 16.
the diffuser plate 13 has a bevel 18 for further deflection of 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 optionally further, in Fig. 1 not shown components.
the diffuser plate 13 with the annular wall 14 is arranged fixed in the housing 19.
the hood 21 encloses the impeller 2 and partially the diffuser plate 13 and the annular wall 14, wherein 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, an annular space 23 is formed.
the annular space 23 is formed continuously along the circumference of the impeller 2 and does not itself contain any flow-conducting 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, with the aid of the blades 7, an air flow directed at least partially radially outward, as in FIG Fig. 1 indicated by the arrows.
air is sucked in along the axis of rotation 9 through the intake flange 22, which in the case of a vacuum cleaner can be connected, for example, to a suction hose.
the air conveyed to the outside first passes into the annular space 23, where, due to the entrainment by the blades 7, it also carries out a movement directed tangentially to the axis of rotation 9.
openings in the diffuser plate 13 passes the generated air flow via the ramp 43 into the space below the diffuser plate 13 and into the guide channels 16, through which it is guided radially inwardly while maintaining a tangential component.
the air flow is deflected further by the bevel 18 in the axial direction and reaches the electric motor 4, where it can be used to cool the windings 12.
the air flow finally reaches the outside area of the blower 1.
the radial and the axial component of the flow direction of the generated air flow are in the in Fig. 1 to recognize shown sectional view with reference to the arrows.
FIGs 2 and 3 are in perspective view the impeller 2 according to Fig. 1 and a guide device 31 designed according to the invention is shown in a perspective view, wherein the hood 21 has been omitted for reasons of illustration.
the impeller 2 a base plate 5 and a cover plate 6, between which a plurality, for example, 13, perpendicular, arcuate curved blades 7 are arranged.
the blades 7 are arranged at the same angular distance from each other and overlap each other, each blade seen from the axis of rotation each covers an angle of about 50 °.
the cover plate 6 has a central recess 26, which allows an axial subsequent flow of air into the central region of the impeller 2.
a bore 27 is introduced, in which for driving the impeller 2, the shaft 8 connected to the rotor 11 of the electric motor 4 can be used and connected to the impeller 2 (s. Fig. 1 ). If the impeller 2 is moved in the predetermined direction of rotation, an obliquely outwardly directed air flow is generated by the inclined, backward-curved blades 7.
the diffuser plate 32 is arranged, whose outer edge with the annular wall 14 defines a plurality of openings 33. Through the openings 33, the air flow from the outside of the impeller 2 adjoining annular space, which passes upwards and outwards through the in Fig. 2 not shown hood 21 is limited (s. Fig. 1 ), in the space below the diffuser plate 32 a. There the airflow, how to Fig. 1 explained, guided radially inward and finally deflected again in the axial direction.
each opening 33 is bounded by the inner wall of the short-cylindrical annular wall 14. Inwardly, each opening 33 is bounded by a flowed-on edge portion 34 and an overflowed edge portion 35 of the outer edge of the diffuser plate 32. Neither the flowed edge portion 34 nor the overflowed edge portion 35 in this case run in the radial direction.
the opening 33 has approximately the shape of an obtuse-angled isosceles triangle, wherein the side defined by the annular wall 14 and the side formed by the overflowed edge portion 35 are each arcuately curved with an outward bulge.
the flowed edge portion 34 is formed substantially straight.
the radial blower according to the first embodiment of the invention is the same as before FIGS. 1 and 2 explained educated.
the impeller 2 is formed as described above and disposed adjacent to the top of the diffuser plate 32.
the diffuser plate 32 has a central bore 36.
the diffuser plate 32 according to Fig. 3 is in Fig. 4 together with the impeller 2 again schematically shown in plan view.
the shaft 8 is fixed to drive the impeller 2.
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 and the impeller 2 to the outer diameter D 'of the diffuser plate 32 is about 0.88 .
the cover plate 6 of the impeller 2 (s. Fig. 1 and 2 ) is in Fig. 4 not shown.
the diffuser plate 32 has peripheral recesses, which together with the annular wall 14 form a plurality of openings 33; for clarity, one of the openings 33 in FIG Fig. 4 characterized by hatching.
the openings 33 are limited by the annular wall 14.
the openings 33 are delimited by the outer edge of the diffuser plate, which in the region of the openings has a streamlined edge section 34 and an overflowed edge section 35.
the openings 33 are not covered by the impeller 2, that is, the distance of the openings 33 from the axis of rotation is at least as large as the radius of the impeller 2.
the flowed edge portion 34 is straight, while the overflowed edge portion 35 is arcuate convexly curved.
the overflowed edge portion 35 includes at each point with a radial direction an angle ⁇ of more than 50 ° and less than 90 °; in Fig. 4 the angle ⁇ between a respective tangent to the overflowed edge portion 35 and a respective radial direction in the inner end point 39 and in the outer end point 40 of the overflowed edge portion 35 is entered.
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 thereto. When exiting the impeller 2, the flow direction of the air at an angle of less than 30 ° to a tangential direction.
Fig. 5 is a diffuser plate 48 according to a second embodiment of the invention, together with the impeller 2 simplified in plan view. Also, this diffuser plate 48, as in the Figures 3 and 4 represented diffuser plate 32 in the radial fan according to Fig. 1 may be used so that a radial fan equipped with the diffuser plate 48 corresponds to the second embodiment of the invention.
diffuser plate 48 of the overflowed edge portion 49 with two sections 46, 47 is formed.
a first section 46 of the overflowed edge section 49 adjoins the flowed-on edge section 29, wherein the first section 46 has the shape of a circular arc whose center 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 arc corresponds to the radius of the impeller 2, so that the first portion 46 comes to lie approximately in extension of the peripheral surface of the impeller 2.
a second portion 47 of the overflowed edge portion 30 is arcuate and forms with a radial direction an angle ⁇ between 50 ° and 90 °, in the example shown by about 80 °, ie with a tangential direction an angle of about 10 °.
Fig. 5 only two openings 50 are shown with an overflowed edge section 49 formed in this way; the remaining openings are also formed in Fig. 5 but only symbolically indicated.
the diffuser plate 48 is like that too Fig. 3 and 4 described diffuser plate 32 is formed, wherein the reference numerals have the same meaning.
the flow direction of a guided below the diffuser plate 48 in a guide channel 16 air flow is in Fig. 5 indicated by the dashed arrows 41.
the passage of the air flow through the diffuser plate 32 is in the in Fig. 6 shown, partially sectioned side view shown.
the indicated by the arrows 42 air flow passes from the annular space 23 through the in Fig. 6 not shown opening 33 (s. Fig. 3 . 4 ) in the space below the diffuser plate 32.
the air flow is guided by an inclined ramp 43, which begins at the outer end point 40 of the overflowed edge 35 (s. Fig. 4 ).
the air flow in this area is guided on the one hand by the annular wall 14 and on the other hand by a vertical sidewall 44 extending along the overflowed edge 35 or slightly offset inwards.
the air flow then passes through the formed between the diffuser plate 32 in the area of the flowed edge portion 34 and the end of the ramp 43, slightly oblique to an axial direction inlet opening 45 into the space below the diffuser plate 32, where a guide channel 16 for further guidance of the air serves (in Fig. 6 Not shown).
a guide channel 16 for further guidance of the air serves (in Fig. 6 Not shown).
two inlet openings in Fig. 6 hatched shown.
the passage of the air flow through the diffuser plate 48 takes place in a similar manner as in Fig. 6 for the first embodiment (s. Fig. 3 . 4 ).
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 of the rotation axis-side boundary of the inlet opening 45 from 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)

EP15163971.3A 2014-04-30 2015-04-17 Ventilateur radial présentant une géométrie de bord d'attaque améliorée Active EP2940311B1 (fr)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
DE102014208127.0A DE102014208127A1 (de)	2014-04-30	2014-04-30	Radialgebläse mit verbesserter Anströmkantengeometrie

Publications (2)

Publication Number	Publication Date
EP2940311A1 true EP2940311A1 (fr)	2015-11-04
EP2940311B1 EP2940311B1 (fr)	2020-07-01

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Application Number	Title	Priority Date	Filing Date
EP15163971.3A Active EP2940311B1 (fr)	2014-04-30	2015-04-17	Ventilateur radial présentant une géométrie de bord d'attaque améliorée

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EP (1)	EP2940311B1 (fr)
DE (1)	DE102014208127A1 (fr)

Cited By (4)

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CN107401517A (zh) *	2016-05-20	2017-11-28	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
CN114704479A (zh) *	2022-04-12	2022-07-05	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
WO2024109123A1 (fr) *	2022-11-22	2024-05-30	广东美的白色家电技术创新中心有限公司	Ventilateur électrique et dispositif terminal

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CN107401517A (zh) *	2016-05-20	2017-11-28	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
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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
CN114704479A (zh) *	2022-04-12	2022-07-05	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
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
WO2024109123A1 (fr) *	2022-11-22	2024-05-30	广东美的白色家电技术创新中心有限公司	Ventilateur électrique et dispositif terminal

Also Published As

Publication number	Publication date
DE102014208127A1 (de)	2015-11-05
EP2940311B1 (fr)	2020-07-01

Publication	Publication Date	Title
DE60125267T2 (de)	2007-09-27	Verfahren und Gerät zur Erweiterung des Betriebsgebietes eines Kreiselverdichters
DE10313054B4 (de)	2012-10-04	Radialgebläse
EP1608875B1 (fr)	2010-12-22	Roue de soufflante radiale, unite de soufflante, et dispositif de soufflante radiale
DE2837543C2 (de)	1984-03-15	Dunstabzugsvorrichtung
EP2875718B1 (fr)	2019-06-05	Appareil de travail manuel doté d'un tube de soufflage
DE19946187A1 (de)	2000-06-29	Transportables Gebläse für fliessfähige Medien
EP3824190B1 (fr)	2024-08-28	Ventilateur et équipement conducteur pour un ventilateur
DE2551614A1 (de)	1976-05-20	Axial kurzer axialventilator
EP2940311B1 (fr)	2020-07-01	Ventilateur radial présentant une géométrie de bord d'attaque améliorée
DE102008001258A1 (de)	2009-10-22	Werkzeugmaschine mit elektrischem Antriebsmotor
EP2740942A2 (fr)	2014-06-11	Ventilateur médical ou dentaire
EP2940310B1 (fr)	2017-09-13	Ventilateur radial à géométrie de bord d'attaque améliorée
DE3907308A1 (de)	1989-09-21	Leitrad fuer ein geblaese
EP2808553B1 (fr)	2017-11-22	Moteur électrique avec roue de ventilateur
DE102008053144A1 (de)	2010-04-29	Lüfteranordnung und Gargerät
DE10020750C2 (de)	2002-01-10	Motorgebläse
EP3617529B1 (fr)	2022-01-26	Bâti de ventilateur d'un véhicule automobile
EP3887684A1 (fr)	2021-10-06	Roue de ventilateur d'un véhicule automobile
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DE102005027460B4 (de)	2013-07-11	Wärme ableitende Vorrichtung
DE3029507A1 (de)	1982-03-04	Seitenkanalgeblaese
DE102005012815A1 (de)	2005-10-06	Gehäuse, Laufrad und Radialgebläse mit einem Gehäuse und einem Laufrad
DE102020216155A1 (de)	2022-06-23	Ventilator und Spiralgehäuse für einen Ventilator
DE102015113985A1 (de)	2016-05-19	Zentrifugalpumpe

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