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WO2013060358A1 - Axial ventilator wheel - Google Patents

Axial ventilator wheel

Info

Publication number
WO2013060358A1
WO2013060358A1 PCT/EP2011/068630 EP2011068630W WO2013060358A1 WO 2013060358 A1 WO2013060358 A1 WO 2013060358A1 EP 2011068630 W EP2011068630 W EP 2011068630W WO 2013060358 A1 WO2013060358 A1 WO 2013060358A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
hub
side
fan
flow
wheel
Prior art date
Application number
PCT/EP2011/068630
Other languages
German (de)
French (fr)
Inventor
Oliver Haaf
Erhard Gruber
Original Assignee
Ebm-Papst Mulfingen Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/32Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/329Details of the hub
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE DISPLACEMENT PUMPS
    • F04D25/00Pumping installations or systems
    • F04D25/02Units comprising pumps and their driving means
    • F04D25/08Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F04D25/082Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor

Abstract

The invention relates to an axial ventilator wheel (1), comprising a wheel body (2) having a hollow cylindrical hub (4) and a plurality of ventilator blades (6) which are distributed around the circumference and connected to the hub (4). Each ventilator blade (6) extends in an axial direction in the area of a blade base (8) connected to the hub (4), and is inclined in a peripheral direction between an inflow side (10) and an outflow side (12) of the hub (4). The hub (4) is shortened with respect to the axial hub length thereof at its inflow side (10) in a peripheral direction between the blade bases (8) of the adjacent ventilator blades (6), respectively, by means of recesses (16) around the edges.

Description

"Axialventilatorrad"

The present invention relates according to the preamble of claim 1 a Axialventilatorrad with a wheel body which is arranged in a tube-like, hollow cylindrical hub and a plurality of distributed over the circumference, with the outer

Peripheral surface of the hub associated fan blades, wherein each fan blade in the region of a hub associated with the blade root extends axially and in the circumferential direction obliquely between an inflow side and an outflow side of the hub.

Such an axial fan impeller is described in the document EP 1609996 A1 / B1. This wheel is provided with its hub for mounting on a rotating part, in particular on a rotor of an electric motor, aufpressbar. For this purpose, within the hub of a substantially cylindrical or ring-shaped blank is arranged.

The known axial fan impeller has proven itself well in practice because it particularly allows for easy installation and a secure mounting on the rotor. In addition, a cooling air flow can be allowed through axial openings of the blank. However, it has been shown that in terms of actual pumping flow-through, ie the main flow of the fan, the flow properties are still in need of improvement.

Therefore, the present invention is based on the object of improving a Axialventilatorrad of the type described, the generic terms of its mainstream and its air power. this is achieved by the features of independent claim 1. According to the invention. Advantageous embodiments of the invention are in the dependent

Claims as well as in the subsequent description.

According to the invention, therefore, the hub is shortened on its upstream side in the circumferential direction between the blade roots of the adjacent fan blades over randliche recesses with respect to its axial hub length. Preference is given by the recesses of the hub between the hub blade roots concave curved edge portions with continuous, edge-free transitions to the in

formed circumferentially adjacent edge sections. In this way, weak points, notch effects and the like can be avoided advantageously.

The formed at the upstream edge of the hub, according to the invention

Recesses are designed appropriately so that troublesome in operation, upon rotation of the Axialventilatorrades by eliminating or minimizing

Edge portions of the delivered air a fan wheel bearing and the rotary-driving electric motor and the hub itself with minimal

Impairments caused by vortex and the like in the region between the

can flow around the fan blades. The inventive recesses a particularly optimized with respect to the air capacity Ventilatorrad- consequently can be achieved by flow.

Reference to a preferred, illustrated in the drawings embodiment of the invention hereinafter will be explained in more detail. Show it:

Fig. 1 is an axial plan view of the front inlet side of a

Axialventilatorrades invention (view taken in the direction of arrow I of FIG. 2),

Fig. 2 side view in direction of arrow II of FIG. 1. FIG. 3 is a perspective view of the Axialventilatorrades according to Fig. 1 and 2 obliquely from the rear toward the downstream side,

Fig. 4 is a perspective view similar to Fig. 3 but in the mounted on a

Electric motor crimped state of Axialventilatorrades invention,

Fig. 5 is a side view similar to Fig. 2 in the assembled state according to FIGS. 4 and

Fig. 6 is a perspective view of FIG. 4 and 5, obliquely from the front in the direction of the inflow side.

In the various figures of the drawing, identical parts are provided with the same reference numerals.

At the subsequent description is emphasized that the invention is not limited to the embodiments and not to all or several features described combinations of features, but each individual partial feature of the / each embodiment can also be detached from all others in connection therewith described part features for themselves and also in combination with any features of another embodiment as well as independently of the combinations of features and relationships of the return

Claims have an inventive significance.

An inventive Axialventilatorrad 1 consists of a wheel body 2, which in turn arranged from a tube-like, hollow cylindrical hub 4 and a plurality of distributed over the circumference, with the outer peripheral surface of the hub 4

connected and starting from the hub 4 or radially inclined outwardly extending fan blades 6 there. The term "inclined" also includes a blade curvature A, as shown by way of example in the drawings. The blades 6 are inclined forward or curved, in particular in the direction of rotation, but may also be inclined backward or curved. In the illustrated

Embodiment, the fan wheel 1 on seven fan blades. 6 The fan blades 6 can evenly with equal angular intervals, or - for the purpose of "natural balance" - uneven with uneven

Angular distances be arranged distributed over the circumference. Each fan blade 6 extends in the region of a blade root 8 connected to the hub 4 and axially obliquely in the circumferential direction, in particular with a certain curvature, between an inlet end 10 and an outflow side 12 of the hub 4 and the

The fan wheel 1. The term "transverse" accordingly also includes here a certain curvature. See, for example, Fig. 3. By this inclination, inclination or curvature of the fan blades 6 during rotation a in Fig. 2 and 5 by arrows 14 illustrated air flow caused as the main flow from the inlet 10 to the outlet 12. the inlet side 10 is also referred to as the suction side and the discharge side 12 and pressure side.

According to the invention the hub 4 respectively between the blade roots 8 of the adjacent fan blades 6 about randliche recesses 16 is now on the upstream side 10 in the circumferential direction in regions with regard to their axial or

axially parallel measured hub length shortened formed. Through this

Recesses 16 in the upstream edge portion of the hub 4 8 hub edge portions 18 are formed between the respective adjacent blade roots, which

preferably concavely curved run. Here, it is further advantageous if the hub concave curved edge portions 18 with continuous, edge- and corner-free transitions pass over into the adjacent respective circumferential edge portions of the hub. 4 In this way, advantageously of mechanical weakness, notch effects and the like are avoided.

As already explained above, an improvement of the flow properties is the effect achieved by the formed at the upstream edge of the hub 4 recesses 16 that, in operation, upon rotation of the Axialventilatorrades 1, lying by eliminating or at least minimizing interfering in the flow area of ​​the main flow hub -Kantenbereichen the conveyed air, the hub 4 with a minimal impairment by vortex, and the like can flow around the area between the fan blades. 6 The inventive

Recesses 16 an optimized fan wheel-flow can thus be achieved. This has a positive impact on air power.

For rotationally driving the Axialventilatorrad 1 is mounted on a rotating part. For this purpose, in a preferred embodiment that an annular blank 20 is mounted within the hub 4 of the wheel 2 with the wheel body 2 to the rotating part, as shown in FIG. 4 to 6 and in particular a cylindrical

Outer circumferential surface of an outer rotor-rotor 22 of an electric motor 24,

is frictionally aufpressbar. We particularly from Fig. 4 and 6, the hub is spaced 4 coaxially with the rotor 22 in the radial direction over the blank 20 due to this type of fastening. The blank 20 is seated in the thus formed

extensive modern annular gap between the rotor 22 and the hub 4. It is provided in a further preferred feature that the circular blank 20 in its

Annular cross-section distributed over the periphery are arranged, which in axial or axially parallel direction through openings 26 in particular for a through-flow of cooling air. Thus, the openings 26 form cooling channels connect the two axially on both sides of the round plate 20 and each extending radially between the hub 4 and the rotor 22 formed annular gap portions to each other so that the rotor 22 during rotation of the pressure side, which is the discharge side 12 for suction side, which is the inflow side 10, flows around with the cooling air, and thereby the motor 24 is effectively cooled. In addition, the openings 26 also permit drainage of condensate, which can form in certain applications and under certain operating conditions.

In a further preferred embodiment of the wheel body 2 to the hub 4 and the fan blades 6 in particular of plastic is formed as a one-piece molding. The blank 20 is comprised at least partially of metal, for example from a molded plastic sheet metal. In a not shown in the drawing configuration can - be provided that the circular blank 20 has on its inner circumference in the circumferential direction alternately arranged first and second surface sections, wherein the first surface portions include a first - in the sense of the aforementioned EP 609,996 A1 / B1 1 define larger inner diameter and the second surface portions of a second, smaller inner diameter. The smaller inner diameter of the second surface portions is such that in this area the force-locking mounting is effected on the rotor 22 during pressing. Accordingly, it is a segmented Ronde, wherein the inner circumferential surface is divided into said sections with different inner diameters. The portions with the smaller diameter to be widened during the pressing, while the portions with the larger diameter or only alter their radial position during the pressing slightly, but advantageously bring about a lowering of the middle level of the mechanical stress values. When pressing is avoided that a developing deformation of the blank could be transferred to the hub.

The blank 20 may be cohesively formed during injection molding of the wheel body 2 directly in the material and optionally additionally coated with plastic.

By the invention is a significant improvement in air capacity of

Axialventilatorrades reached first The largest effects are in short engine sizes, ie with a small axial length. For applications without the

Cooling flow (rotor-back flow) results by the selected hub geometry a significant advantage, because the main flow in the hub area to avoid or eliminate impurities significantly smaller vortices caused to the hub.

The invention is not limited to the illustrated and described embodiments, but also all the purposes of the invention, the same effect versions. It is emphasized that the embodiments are not limited to, all features in combination, rather, each individual

Part feature and separate from all other sub-features for a

have inventive significance. Furthermore, the invention is so far still not restricted to the feature combination defined in claim 1, but may also be defined by any other desired combination of particular features of all the individual features disclosed. This means that in principle, virtually eliminated any individual feature of claim 1 and can be replaced with at least one disclosed elsewhere in the application minutia. Insofar as the claim 1 is to be understood merely as a first attempt at formulating an invention.

Claims

claims
1. Axialventilatorrad (1) with a wheel body (2) consisting of a hollow cylindrical hub (4) and a plurality of distributed over the periphery are arranged, with the hub (4) fan blades (6) connected, wherein each fan blade (6) in the region one with the hub (4) is inclined axially and circumferentially between an inflow side (10) and an outflow side (12) of the hub (4) runs associated blade root (8),
characterized in that the hub (4) on its upstream side (10) in the circumferential direction between the blade roots (8) of the adjacent fan blades (6) via randliche recesses (16) is shortened with respect to its axial hub length.
2. Axialventilatorrad according to claim 1,
characterized in that through the recesses (16) of the hub (4) between the blade roots (8) concavely curved hub edge portions (18) are formed.
3. Axialventilatorrad according to claim 1 or 2,
characterized in that there is fixed a ring-shaped blank (20) within the hub (4), with the wheel body (2) on a rotating part,
in particular an external rotor-rotor (22) of an electric motor (24) is aufpressbar.
4. Axialventilatorrad according to claim 3,
characterized in that the circular blank (20) arranged distributed in the ring cross-section over the periphery, axial through holes (26) in particular for a through-flow of cooling air.
5. Axialventilatorrad according to any one of claims 1 to 4,
characterized in that the wheel body (2) to the hub (4) and the fan blades (6), in particular made of plastic, is formed as a one-piece molding.
6. Axialventilatorrad according to any one of claims 3 to 5,
characterized in that the circular blank (20) at least partially consists of metal.
PCT/EP2011/068630 2011-10-25 2011-10-25 Axial ventilator wheel WO2013060358A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2011/068630 WO2013060358A1 (en) 2011-10-25 2011-10-25 Axial ventilator wheel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20110773290 EP2771581A1 (en) 2011-10-25 2011-10-25 Axial ventilator wheel
PCT/EP2011/068630 WO2013060358A1 (en) 2011-10-25 2011-10-25 Axial ventilator wheel

Publications (1)

Publication Number Publication Date
WO2013060358A1 true true WO2013060358A1 (en) 2013-05-02

Family

ID=45688098

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/068630 WO2013060358A1 (en) 2011-10-25 2011-10-25 Axial ventilator wheel

Country Status (2)

Country Link
EP (1) EP2771581A1 (en)
WO (1) WO2013060358A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1219837A2 (en) * 2001-01-02 2002-07-03 Behr GmbH & Co. Fan with axial blades
WO2003010438A1 (en) * 2001-07-27 2003-02-06 Spal S.R.L. Ventilation unit
US20030138324A1 (en) * 2002-01-24 2003-07-24 Hsieh Hsin-Mao Cooling fan
DE202004005548U1 (en) * 2003-04-19 2004-06-17 Ebm-Papst St. Georgen Gmbh & Co. Kg Fan
EP1609996A1 (en) 2004-06-25 2005-12-28 ebm-papst Mulfingen GmbH & Co.KG Rotor, in particular for an axial fan
US20070172350A1 (en) * 2006-01-23 2007-07-26 Delta Electronics, Inc. Fan and impeller thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1219837A2 (en) * 2001-01-02 2002-07-03 Behr GmbH & Co. Fan with axial blades
WO2003010438A1 (en) * 2001-07-27 2003-02-06 Spal S.R.L. Ventilation unit
US20030138324A1 (en) * 2002-01-24 2003-07-24 Hsieh Hsin-Mao Cooling fan
DE202004005548U1 (en) * 2003-04-19 2004-06-17 Ebm-Papst St. Georgen Gmbh & Co. Kg Fan
EP1609996A1 (en) 2004-06-25 2005-12-28 ebm-papst Mulfingen GmbH & Co.KG Rotor, in particular for an axial fan
US20070172350A1 (en) * 2006-01-23 2007-07-26 Delta Electronics, Inc. Fan and impeller thereof

Also Published As

Publication number Publication date Type
EP2771581A1 (en) 2014-09-03 application

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