EP2808553A2 - Impeller wheel - Google Patents

Abstract

The invention relates to an impeller (3) mounted on the rotor of an electric motor (1), the impeller (3) having an impeller axis (x) and impeller vanes (7) covered by a co-rotating cover part (8), the impeller vanes (7) further 7) have an extension in the axial direction. In order to further improve a fan wheel of the type in question in particular fluidically, it is proposed that the ceiling part (8) covers the fan wheel blades (7) radially outward in the direction of the axis (x) to half or more of the axial extent of the fan wheel blades (7) ,

Description

The invention relates to an impeller attached to the rotor of an electric motor, the impeller having an impeller axis and, covered by a co-rotating ceiling part impeller blades, further wherein the impeller blades have an extension direction in the axial direction.

Blower wheels of the type in question are known. These are preferably driven by an electric motor, wherein the impeller is further preferably non-rotatably attached to the rotor axis of the electric motor. As a result of the fan blades arranged, an air flow is achieved via the rotating fan wheel, in particular for cooling the electric motor, more preferably in the arrangement of the electric motor and fan wheel, for example in a vacuum cleaner or the like, for building up a suction air flow. The impeller blades are covered by a co-rotating ceiling part. This essentially serves for the targeted direction of flow in the area of the fan wheel, so on, in particular for achieving a radial fan. In this case, the air is preferably sucked in the axial direction, more preferably centrally of the impeller, more preferably passing through a corresponding opening of the ceiling portion, and passed at least according to the arrangement of the impeller blades radially outward.

An electric motor with such an impeller is, for example, from the DE 10 2008 014 624 A1 known.

In view of the known prior art, a technical problem of the invention is seen in an impeller of the type in question, in particular fluidically to further improve.

A possible solution of the problem is given according to a first inventive concept in an impeller in which it is geared to that the cover part covers the impeller blades radially outward in the direction of the axis to half or more of the axial extent of the impeller blades. As a result of this embodiment, in particular the radially outwardly directed opening areas between the impeller blades are at least partially covered radially on the outside, so that at least a partial deflection of the air flow and optionally entrained by the air flow particles results in this area. Accordingly, the ceiling part extends from an axial overlap of the impeller blades into an at least partially radial overlap, which results in a preferred embodiment, a ceiling part with one, the radially outwardly facing end edges of the impeller blades overlapping, circumferential wall area.

Further features of the invention are explained below, also in the description of the figures, often in their preferred association with the subject matter of claim 1 or with features of further claims. But they can also be in an assignment to only individual features of claim 1 or the respective further claim or each independently of importance.

Thus, it is provided in a further preferred embodiment that the cover part radially covers the impeller blades in the inflow direction of the air or in the direction of extent of the axis to a given in this direction end of the impeller blades. Correspondingly, the cover part extends at least in a region comprising the impeller blades radially outward, more preferably with respect to a cutting plane extending in the axial direction of the impeller at least approximately parallel to the inflow direction of the air, further approximately parallel to the axis of rotation of the impeller. More preferably takes such, the fan blades radially outwardly overlapping Section of the ceiling part an acute angle to the impeller axis, is oriented accordingly at an acute angle along an axis parallel. The ceiling part further preferably extends with the fan blades radially outwardly surrounding portion at least up to an axial end of the impeller blades, in particular an axial end of the radially outward preferably free existing front edge of the impeller blades, which end is further preferably opposite to the covered by the ceiling part axial end , More preferably, this section of the ceiling part extends beyond the axial end, in particular the free end edge of the edge of the impeller blades, more preferably also via a, the impeller blades carrying bottom part of the impeller.

The impeller blades are formed in a further preferred embodiment in a radial overlap area with the ceiling part at least over a part of the given length in the axial direction with respect to a radially outer end of an impeller with radial clearance to an inner surface of the ceiling part. This results in a further preferred embodiment, a gap portion, in particular a circumferential gap portion with respect to the axis of rotation between the radially outer ends of the impeller blades and the facing inner surface of the ceiling portion. Through this gap, a flow of air and possibly entrained particles is made possible, more particularly with a tendency in the axial direction, more preferably at least approximately the same direction to the inflow direction of the air.

It is further preferred that in a radial covering area to the fan wheel blades, the ceiling part extends widening radially outward in the direction of the axis. It results in this respect preferred - with respect to a vertical section through the impeller - an example. Conical expansion. In preferably parallel to the rotational axis of the impeller extending free end edge edges of the impeller blades results here further preferred an example. Wedge-shaped enlargement of the gap between the edge edge edge and facing inner surface of the ceiling part.

Based on a cross-section, in a further preferred embodiment, the radial extension over the length of the axis is formed, including different angles with the axis. Thus, it is further preferred that the area of the ceiling part formed in radial overlap with the impeller blades is rectilinear with respect to a cross-section, evenly spaced from the axis, while an adjoining, preferably free-terminating end portion of the ceiling part encloses an altered acute angle with respect to the axis , This end region further preferably extends below the impeller, in particular in the region of a formed diffuser.

The radially free end region of the ceiling part preferably encloses a larger angle with the axis than a middle region of the ceiling part, in particular as a region formed in radial overlap with the fan wheel blades. Thus, this range preferably includes an acute angle of 5 ° to 30 °, more preferably 10 ° to 20 °, while the free end portion of the ceiling portion preferably includes an angle of 30 ° to 75 °, more preferably 45 ° to 60 ° to the rotation axis ,

The ceiling portion extends in a preferred embodiment in the direction of the axis of the impeller blades by an amount beyond, which preferably corresponds to half or more of the axial height of the impeller blades, more preferably half or more of the largest axial height of the impeller blades in the course of their radial extent. More preferably, the ceiling part extends up to a three times the axial height of the impeller blades in the direction of the axis on the impeller blades.

It is further preferred that a radially free end region of the ceiling part passes through a motor housing of the electric motor in a plane transverse to the axis. In this case, enforcement of a partial region of the motor housing is furthermore preferably provided, more preferably such that the co-rotating cover part is at least further covered by a section of the motor housing at least in the region extending radially beyond the fan wheel blades in the axial direction.

A radial free end region of the ceiling part, in particular an end region of the ceiling part which extends beyond the fan wheel blades in the direction of the axes, is surrounded in a preferred embodiment by an annular receiving space such that optionally conveyed liquid is supplied to the receiving space on an inner side of the ceiling part. Any fluid particles entrained with the air flow or solid particles are first, in particular due to the design of the ceiling part, further derived from the resulting centrifugal forces along the inside of the ceiling part in the direction of the free end region and delivered into the receiving space adjoining this end region. The end region can end here with a small distance to the receiving space. In a further embodiment, it is provided that the end region extends into the receiving space. As a result of this refinement, a separation, in particular of liquid particles, from the air stream is achieved, which liquid particles are purposefully collected at least temporarily in the receiving space.

The fluid possibly collected in the receiving space is discharged regularly in one embodiment, for example. In this regard, it is preferred that the receiving space in any case has an outlet opening extending in the direction of the axis. More preferably, the outlet opening, in particular a central axis of the outlet opening, extends oriented parallel to the axis of rotation of the impeller. About this outlet opening can in the Receiving room supplied liquid or the like can be specifically removed. For example. can connect to the outlet opening a drain line, for example. In the form of a hose. More preferably, the outlet opening is associated with a bottom of the receiving space, which latter is designed in a trough-like manner in a preferred embodiment with respect to a cross section.

The acting centrifugal forces in the operation of the blower, the liquid phase is imparted a swirling energy, which leads in a preferred embodiment in the annular receiving space to a corresponding promotion of the liquid phase in the same. In order to prevent a possibly multiple circulation of the liquid phase in the receiving space, it is provided in a preferred embodiment that the outlet opening is associated with a Abteilausformung, which protrudes at a distance radially inward to an outer wall of the receiving space and the outlet opening. Preferably, this Abteilausformung is formed out of a radially outer annular wall of the receiving space. Due to the stagnation-like Abteilausformung the liquid phase is directed to the outlet opening. As a result, a multiple orbiting of the liquid phase is counteracted, which would otherwise lead to a reduction of the spin energy. Due to the selected measure, the system can be used regardless of location.

In addition, it is preferred that the compartment formation ends projecting freely in the projection in a projection corresponding to a center axis of the outlet opening. Thus, in such a projection, the compartment formation preferably extends from an edge of the outlet opening over 20% to 80% of the largest cross-sectional dimension of the outlet opening freely into the outlet opening.

The ceiling part is preferably covered by a fixed motor housing section. More preferably, the ceiling part is completely covered by the fixed motor housing section rotates accordingly in the operation of the Blower in a hiding position. Here, the motor housing portion in cooperation with areas of the ceiling part form a barrier against in particular liquids between the ceiling part and the motor housing portion. In a preferred embodiment, this is achieved by a labyrinthine interaction of the ceiling part and the motor housing section.

The ceiling part preferably forms, at least in a covering area, seen transversely to the axis, to the electric motor or motor housing, in cooperation with the motor housing, a radially directed channel between an upper side of the motor housing and an underside of the ceiling part. Through this channel, the separated, liquid phase is directed towards the receiving space, which receiving space preferably connects to the channel. The channel is in this case further preferably formed circumferentially with respect to the axis. Essentially projects into this channel, the free end portion of the ceiling part, which includes a larger angle with the axis. With respect to a cross section, the upper side of the motor housing and the underside of the cover part extend at least approximately parallel, so that the channel formed thereby has a constant extent over its entire (tendency) radial length.

This given perpendicular to the flow direction of the channel width of the channel corresponds in a preferred embodiment a third or less of the given radially outside at the free end free height of the impeller blades. More preferably, the width corresponds to 0.2 to 1 times the radially outside given free height of the impeller blades. In a further embodiment, the gap dimension selected (width of the channel) corresponds to about 1% to 5%, more preferably about 2% of the maximum diameter of the channel considered in a plane oriented transversely to the axis.

The given in the flow direction length of the channel preferably corresponds to 0.1 to 0.3 times the diameter of the impeller at the free end of an impeller blade, here possibly based on the largest diameter of the impeller if it changes over the axial height of the impeller blades , In a further embodiment, the gap length of the channel given thereby corresponds to approximately 5% to 15%, more preferably approximately 9% of the largest channel diameter with respect to the axis.

More preferably, the length of the channel at least approximately corresponds to the given in cross-section length of the region of the ceiling part, which includes a larger acute angle with the axis.

From the outlet opening, the liquid phase is optionally conveyed away in a preferred embodiment with a partial air flow against gravity. This partial air flow results from the total air flow, which is constructed by the activated impeller. The partial air flow in this case preferably corresponds to up to 10% of the intake air volume and is preferably guided through the channel and the receiving space to the outlet opening, with the preferred support of the removal of the liquid phase from the receiving space.

With regard to the disclosure, the ranges and / or ranges of values or multiple ranges given above also include all intermediate values, in particular in 1/10 increments of the respective dimension, if necessary also dimensionless, in particular 1.01 times etc., on the one hand for delimitation the aforementioned range limits from below and / or above, alternatively or additionally, but also with regard to the disclosure of one or more singular values from the respectively specified range.

Figur 1:

Einen Elektromotor mit einem in einem Motorgehäuse partiell verdeckt angeordneten Gebläserad in perspektivischer Darstellung;

Figur 2:

den Schnitt gemäß der Linie II-II in Figur 1;

Figur 3:

den Schnitt gemäß der Linie III-III in Figur 2;

Figur 4:

eine perspektivische Schnittdarstellung im Wesentlichen des Bereiches IV in Figur 2.

The invention is explained below with reference to the accompanying drawings, which, however, illustrate only one embodiment. The drawing shows:

FIG. 1:

An electric motor with a partially hidden in a motor housing arranged impeller in a perspective view;

FIG. 2:

the section according to the line II-II in FIG. 1 ;

FIG. 3:

the section according to the line III-III in FIG. 2 ;

FIG. 4:

a perspective sectional view substantially of the area IV in FIG. 2 ,

Illustrated and described first with reference to the FIGS. 1 and 2 an electric motor 1 with an impeller 3 arranged on a rotor shaft 2 and a guide stage in the form of a diffuser 4. The impeller 3 is rotatably mounted on the rotor shaft 2 and is rotated about this, wherein the rotor shaft 2 rotatably with a rotor of the Electric motor 1 is connected. The rotor interacts with a stator, not shown, of the electric motor. The diffuser 4 is not rotatably mounted in a, the electric motor 1 substantially receiving the motor housing 5.

The fan wheel 3 further preferably has an initially substantially perpendicular to the axis of rotation x aligned fan base 6. This is in particular hub-thickened in the central region, for rotationally fixed connection to the rotor shaft. 2

On the impeller bottom 6, in particular facing away from the electric motor 1, impeller blades 7 are formed. These are further preferred in particular in the embodiment of the impeller 3 from a plastic injection molded part in one piece and of the same material formed with the impeller bottom 6. The Fan blades 7 extend substantially from radially inward to radially outward, in particular up to the edge of the fan wheel base 6, more preferably in this case with respect to a floor plan or a projection on the impeller bottom 6 curved in a circular segment.

The impeller blades 7 preferably have a constant height h over their radial longitudinal extent. This preferably corresponds to about 0.1 to 0.3 times the impeller diameter.

The impeller blades 7 are further preferably at least largely covered on the side facing away from the impeller bottom 6 by a ceiling part 8. This ceiling part 8 initially has a preferably parallel or substantially parallel to the blower bottom 6 extending ceiling portion 9, in which a central inlet opening 10 is left.

The ceiling part 8 is rotatably connected to the impeller 3, rotates accordingly in operation of the electric motor 1 with.

Starting from the ceiling section 9, the ceiling part 8 further extends at least in radial overlap to the radially outer ends of the fan wheel blades 7, more preferably starting from the ceiling section 9 to beyond the plane of the fan wheel base 6 addition.

This radial extension 11 extends with respect to a cross section according to FIG. 2 at an acute angle α of 5 ° to 15 °, more preferably about 10 ° to an axis parallel. More preferably, the radial extension 11 extends from the ceiling portion 9 to above a level on the impeller bottom 6 addition, which corresponds to about 0.5 to 1 times the impeller blade height h. Here, the radial extension 11 extends in cross section starting from the ceiling portion 9 towards the free end region radially widening.

The radial extension 11 merges into a free end region 12. This is, as well as the radial extension 11, in cross section according to FIG. 2 formed elongated rectilinearly, in this case more preferably an angle β of 40 ° to 60 °, more preferably about 45 ° to 50 ° to an axis parallel enclosing. The free end region 12 extends radially widening starting from the radial extension 11 in the direction of the free end.

The length l of the free end region 12 in cross section preferably corresponds to 0.8 to 1.2 times the fan blade height h.

Like the fan wheel bottom 6, the ceiling part 8 with its radial extension 11 and the free end area 12 is designed to be rotationally symmetrical with respect to the axis of rotation x.

In particular, the free end region 12, moreover also the section of the radial extension 11 projecting beyond the blower bottom 6, are arranged in a preferred embodiment in radial overlap with the diffuser 4, whereby the diffuser 4 can directly also be part of the motor housing 5.

The free end portion 12 of the ceiling part 8, together with one, the radially inner side of the free end portion 12 facing surface of the motor housing 5 and diffuser 4 with respect to the axis of rotation x annular channel 13. In this case, the free end portion 12 facing surface of the Motor housing 5 preferably parallel to the facing inner surface of the free end portion 12, whereby substantially the channel 13 extends at an acute angle corresponding to the angle β sloping radially outward.

The resultant gap height in the channel 13 or the width b given thereby transversely to the longitudinal extension of the free end region 12 preferably corresponds to approximately 2% of the largest diameter d of the channel 13 FIG. 2 considered length of the channel 13 preferably corresponds to the length of the free end portion 12, more preferably about 9% of the diameter d of the channel thirteenth

The channel 13 is designed to be open both radially inward in the direction of the impeller 3 receiving space, as well as circumferentially radially outward. This is followed by the channel 13 an annular, correspondingly circumferential receiving space 14 at. Whose receiving space floor extends in a direction transverse to the axis of rotation x extending plane, which is further spaced from the ceiling portion 9 than the circumferential free edge of the free end portion 12th

The receiving space 14 is limited in cross-section on the one hand by the motor housing 5 and an extension of the diffuser 4, further by the hereby preferably integrally formed and uniform material receiving space floor 15 and more preferably by a foot portion of a further preferably fixed motor housing portion 16. This motor housing portion 16 cup-like over the It is further preferred with the other motor housing 5 and / or the diffuser 4 and rotatably connected thereto to the electric motor 1.

The motor housing portion 16 further preferably extends the free end portion 12, the radial extension 11 as well as the ceiling portion 9 each substantially (with respect to the inner wall) extending parallel thereto covering, more preferably in vertical projection to the inlet opening 10 of the ceiling part 8 and in the motor housing portion 16, a corresponding inlet opening 17 is formed.

More preferably, inside, i. facing the impeller 3, circumferentially to the inlet opening edge edge reaches a labyrinthine interaction with the ceiling part 8. For this purpose, the cover part 8 engages with preferably two concentric with each other, the cover part upper side shaped ribs 18 in correspondingly positioned grooves 19 of the motor housing portion 16 a.

In the receiving space bottom 15, an outlet opening 20 is further preferably provided, with a preferably circular opening edge edge.

The outlet opening 20, facing away from the receiving space 14, merges into an outlet channel 21. This further extends preferably in the direction of the axis of rotation x, according to parallel thereto or along a parallel oriented along.

The outlet channel 21 is open in the representations to the environment. It may continue to connect to the outlet 21, a hose or the like.

Further associated with the outlet opening 20 is a stowage wall-shaped Abteilausformung 22 is provided. This Abteilausformung 22 is preferably made of the radially outer wall of the receiving space 14, protrudes here with the free end radially inward - with respect to the axis of rotation x - before, so that the free end portion a radial distance to the outer wall or to an extension of Outside wall occupies. Viewed in projection onto the outlet opening 20, the compartment formation 22 projects freely into the outlet opening 20, more preferably approximately in the area of an outlet opening central axis, with a preferred diameter of the outlet opening 20 that is at least 1.5 times the radial extent of the receiving room floor 15 corresponds. The radial outer wall of the receiving space 14 extends here correspondingly different from the otherwise concentric alignment with the axis of rotation x (see. FIG. 3 ).

Due to the above-described embodiment, a preferably position-independent water separation is achieved in such a blower. This with a low building requirement.

During operation of the electric motor 1 or the blower wheel 3, air tends to be sucked in the axial direction through the inflow opening 10 and tends to be directed radially outwards by the blower wheel 3. A possible air-water mixture is in this case offset by the impeller 3 in spin, whereby the heavier liquid phase by the resulting centrifugal forces on the co-rotating, cup-shaped ceiling part 8, further reflected in particular in the region of the radial extension 11.

The liquid phase is thrown off from the co-rotating, in the flow direction twice conically radially expanded portion 11 into the receiving space 14, wherein the impressed swirl energy is used to promote the liquid phase at the periphery of the receiving space 14 along the outlet opening 20.

Here, the liquid phase is deflected by the counter to the flow direction within the receiving space 14 directed Abteilausformung 22 to the outlet opening 20. A multiple orbiting of the liquid phase within the receiving space 14 is counteracted. A multiple circling would lead to a reduction of the swirl energy, whereby the desired position independence of the system would be disturbed.

From the outlet opening 20, the liquid phase with a relatively small partial air flow (preferably less than 10% of the total sucked

Air quantity in the region of the inflow opening 10) possibly also transported away against gravity.

In the channel 13, the twist is kept so high by the co-rotating cover part 8 that water is prevented from flowing back in the direction of the diffuser 4 along the motor housing side wall of the channel 13.

The receiving space 14 is formed spirally with a further preferred embodiment. Further, distributed over the circumference of the receiving space 14 a plurality of outlet openings 20 may be assigned, so for example, two, three, four or more, which may also be radially aligned with respect to the axis of rotation x, beyond preferably also tangentially.

The bladed diffuser 4 provided axially behind the fan wheel bottom 6 (viewed in the inflow direction) has an axial distance to the ceiling section 9 which is approximately 0.2 times the fan wheel diameter. It is also preferable to provide an overlap of diffuser 4 and co-rotating cover part 8 present in the axial direction, which overlap preferably corresponds to approximately 0.1 times the fan wheel diameter. <B><u> REFERENCE LIST </ u></b> 1 electric motor b width 2 rotor shaft d diameter 3 blower H height 4 diffuser l length 5 motor housing x axis of rotation 6 Gebläseradboden 7 Gebläseradschaufel 8th cover part α angle 9 ceiling section β angle 10 inflow 11 radial extension 12 free end area 13 channel 14 accommodation space 15 Receiving chamber floor 16 Motor housing portion 17 inlet opening 18 rib 19 groove 20 outlet 21 exhaust port 22 Abteilausformung

Claims (10)

An impeller (3) mounted on the rotor of an electric motor (1), the impeller (3) having an impeller axis (x) and impeller vanes (7) covered by a co-rotating ceiling portion (8), further wherein the impeller vanes (7) extend have in the axial direction, characterized in that the cover part (8) the impeller blades (7) radially outwardly in the direction of the axis (x) covers half or more of the axial extent of the impeller blades (7). Fan wheel according to Claim 1, characterized in that the cover part (8) radially covers the fan wheel blades (7) in the inflow direction of the air or in the extension direction of the axle (x) beyond an end of the fan wheel blades (7) provided in this direction. Blower wheel according to claim 1, characterized in that the impeller blades (7) in a radial overlap area with the ceiling part (8) at least over a part of the given height in the axial direction (h) with respect to a radially outer end of an impeller blade (7) with radial clearance an inner surface of the ceiling part (8) are formed and / or, preferably, that in a radial coverage area to the impeller blades (7), the ceiling part (8) extends in the direction of the axis (x) expanding radially outward. Fan wheel according to claim 1 or 3, characterized in that the radial extension (11) with respect to a cross section, over the length of the axis (x) including different angles (α, β) with the axis (x) is formed and / or in that a radial free end region (12) of the cover part (8) with the axis (x) encloses a larger angle (β) than a middle region. Fan wheel according to claim 1, characterized in that the cover part (8) extends in the direction of the axis (x) beyond the impeller blades (7) by an amount equal to half or more of the axial height (h) of the impeller blades (7). corresponds and / or, preferably that the ceiling part (8) extends in the direction of the axis (x) over the impeller blades (7) by an amount up to a 3 times the axial height (h) of the impeller blades (7 ) corresponds. Blower wheel according to claim 1, characterized in that a radially free end region (12) of the ceiling part (8) passes through a motor housing (5) of the electric motor (1) in a plane transverse to the axis (x) and / or, preferably, that a radially free end region (12) of the cover part (8) is surrounded by an annular receiving space (14) such that liquid conveyed on an inner side of the cover part (8) is delivered into the receiving space (14). Blower wheel according to claim 6, characterized in that the receiving space (14) in any case in the direction of the axis (x) extending outlet opening (20). Fan wheel according to claim 6 or 7, characterized in that the outlet opening (20) is associated with a Abteilausformung (22) which projects at a distance radially inward to an outer wall of the receiving space (14) and the outlet opening (20) and / or preferred that the Abteilausformung (22) in a projection corresponding to a central axis of the outlet opens freeaufend into the outlet opening (20). Blower wheel according to claim 1, characterized in that the ceiling part (8) of a fixed motor housing portion (16) overlap is and / or, preferably, that the cover part (8), at least in a transverse to the axis (x) covered area to the electric motor (1) or motor housing (5), in cooperation with the motor housing (5) has a radially directed channel (13) between an upper side of the motor housing (5) and an underside of the ceiling part (8). Fan wheel according to claim 9, characterized in that a perpendicular to the flow direction of the channel (13) given width (b) of the channel (13) corresponds to one third or less of the radially outside given free height (h) of the impeller blades (7) and / or , preferably that the width (b) of the channel (13) corresponds to 0.2 to 1.0 times the radially outside given free height (h) of the impeller blades (7) and / or preferred that given in the flow direction Length (l) of the channel (13) corresponds to 0.1 to 0.3 times the diameter of the impeller at the free end of an impeller blade (7), possibly related to the largest diameter.

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