EP1258636B1 - Fan rotor and fan, particularly a radial fan - Google Patents

Abstract

A ventilator fan unit has a housing at the centre of which is an electric motor with an upright shaft. In plan view the housing has a ring-shaped outer panel which translates at approx. the mid-point to a shallow V-shaped ring with flange at the centre of which is the motor housing. The motor stands proud of the ring. The ring has a number of drain hole detents at the interface between the motor housing and the ring flange.

Description

The invention relates to a fan wheel, in particular a radial fan wheel, with several Scoops and with an end face, in particular connecting the blades, in substantially circular, substantially perpendicular to a longitudinal axis of the Fan wheel arranged cover disc, the inside diameter of the annular cover plate a tubular receptacle for the fan wheel protrudes driving motor, the jacket of which runs coaxially to the longitudinal axis. Furthermore The invention relates to a fan, in particular a radial fan, with such a fan Fan wheel and with a motor driving the fan wheel.

Fans are often used under conditions, under where there are strong temperature fluctuations, the air has a high relative humidity has or can even be loaded with fog droplets. In these cases, on condensation or a build-up on the surfaces of the motor and fan Water precipitation occurs. To prevent the separated water in penetrates the engine and causes damage, one possibility is to to drain this water. Otherwise there is a risk that Electronics fault of the motor or short or winding shorts occur.

The risk of water or moisture penetration occurs in particular standing motor and depends on the type and installation position of the arrangement. On A particularly critical case is when the fan is vertical arranged shaft is installed. With the fan running, the problem is natural significantly lower, since the existing water quantities due to the radial forces be thrown out.

In particular, the problem occurs with external rotor motors, which often have this Fan wheel is attached to the rotor of the motor, for example by a Pressing the fan wheel on the rotor can happen. As with external rotor motors an air gap between the rotor and stator is unavoidable, it is under Possible under certain circumstances, a certain seal between the rotor and stator To ensure labyrinth sealing elements, however, is such a secure seal not possible in this way as with internal rotor motors.

Furthermore, due to the described accumulation of water, in particular Radial fans affected, where the radial wheel has an annular shape Cover plate (preferably a sheet metal blank) comprises, on the outer edge of several Blades or fan blades are attached that extend axially to one another arranged, curved further cover plate or one piece with the Extend ring-shaped blades.

For example, in DE 29 19 843 A1 there is a radial fan wheel of the type mentioned at the beginning described backward curved blades and associated sheet blank, in which Buckets made of plastic, in which axially, to those made of metal Ronde indicating end edges at right angles to the outer edges of the blades run and are attached to the round blank (cover plate). The front edges opposite edges of the blades widen from the periphery starting in the radial direction in an arc and are at one in Air flow direction molded plastic ring. Such a fan wheel, which in Similar execution also in the German utility model DE 72 31 389 U1 has an excellent efficiency, works extremely quietly and can be produced with comparatively little effort.

The sheet metal disk of the well-known fan wheel, also called the rear cover plate, which in the is essentially flat, but also - at least in some areas - in plate form can have a central opening for receiving the motor, in particular whose rotors. In order to be able to accommodate the motor, the fan wheel is like this formed that the edge of the cover plate around the opening axially, approximately parallel to the axis, is bent into the interior of the fan wheel, so that a tubular Recording, a so-called passage, is formed for the engine. In this opening In particular, the rotor of an external rotor motor with the formation of a force and positive connection pressed.

With this fan wheel, the water accumulation on the upper (the Form air side facing away) side of the rear cover plate and at one certain water level through the gap between the rotor and stator in the motor penetration. Therefore, it is known to manufacture these fan wheels Several holes are provided to drain condensation or otherwise enable water to accumulate on the sheet metal blank. This Holes are located in the area of the kink, i.e. at the transition from that flat or plate-shaped area of the cover plate in the tubular axial, the Engine mounting area (passage). Through various influences, such as e.g. due to tolerances in the stamping and bending process for the production of Sheet metal or due to inaccuracies when pressing the rotor into the fan wheel, the problem may arise that optimal water drainage is no longer possible. In addition, it proves problematic that during assembly due to a previous punch burr formation on the fan wheel in the area of the bore damage the surface (color) of the rotor can occur.

For possible tolerances, e.g. due to inaccuracies of the Compensate with the rotor or the passage of the sheet metal blank when pressing in the rotor to be able to, therefore, the axial in the known fan wheel Motor mounting area also provided with a segmentation. that is, starting from its end region, the tubular are in the jacket Motor mount incisions introduced to the peripheral area in approximately the same Divide areas, but with an increased manufacturing effort connected is.

The invention has for its object with little manufacturing effort to provide a fan wheel and a fan of the type described in the introduction, such that, on the one hand, water separation endangering the function of a fan can be counteracted effectively, but on the other hand none structural disadvantages, such as in particular those related to those described above Lead to problems that have to be accepted.

This object is achieved in that the tubular tubular Motor receptacle extending the entire length of the receptacle Bulges bulging radially outward are arranged.

The fact that, according to the invention, in the axial area serving to fasten the engine, Bead-like bulges are provided radially outward, which are Extending over the entire engine mounting area advantageously results on the one hand, a defined trough for any that are to be drained off Water accumulations that can form on the sheet round plate. Through the Bead-shaped formation of this area, on the other hand, there is the advantage that a elastic range is formed within certain limits to compensate for the above Tolerances addressed, so that no further segmentation in the form of incisions in the edge area is required.

With a fan, especially with a radial fan, with a fan wheel and with a motor driving the fan wheel, which according to the invention has a fan wheel with the Features mentioned, the motor can preferably as an external rotor motor be formed, advantageously an outer contour of the motor, in particular a Outer contour of a rotor of the motor designed as an external rotor motor, one Press fit with the tubular receptacle of the cover plate of the fan wheel forms. Such a fan is good in front of it both during operation and when it is at a standstill protected that moisture gets to endangered components, on the other hand it is manufacturing technology with - compared to the fans described - reduced Effort can be made.

Fig. 1

eine, teilweise geschnittene Aufsicht auf einen Lüfter mit einem Lüfterrad, in erfindungsgemäßer Ausbildung,

Fig. 2

einen Axialschnitt durch den Lüfter gemäß Fig. 1 in der Ebene II-II.

Further advantageous embodiments of the invention are contained in the subclaims and the description below. The invention will be explained in more detail with reference to an embodiment shown in the accompanying drawing figures. Show it:

Fig. 1

a partially sectioned top view of a fan with a fan wheel, in the inventive design,

Fig. 2

an axial section through the fan of FIG. 1 in the plane II-II.

In the two figures of the drawing, the same parts are always the same Provide reference numerals so that they are usually only described once become.

In the preferred embodiment of Figs. 1 and 2 illustrated in Figs The invention is an electric motor 1 for driving an embodiment of the invention Fan wheel 2 provided and for this purpose in a tubular receptacle 3 (passage) the fan wheel 2 held.

The fan wheel 2, which is in particular a radial fan wheel, has a plurality of blades 4 and one connecting the blades 4 at the end, essentially circular cover plate 5. The cover plate 5 is substantially vertical arranged to a longitudinal axis X-X of the fan wheel 2, the inside diameter Dl of the annular cover plate 5, the tubular receptacle 3 for the motor 1st protrudes.

The jacket 6 of the receptacle 3 is cylindrical, the central axis of which Cylinder is formed by the longitudinal axis X-X of the fan wheel 2 (or coaxially with this runs).

The cover plate 5 has between a bordering on its outer diameter DA flat edge region 7 and its inner diameter Dl a plate-like curvature 8 and - including the passage - is preferred as a bent stamped part made of sheet metal executed.

The electric motor 1 is preferably designed as an external rotor motor, with an over a stator flange 9 stator 10 which can be fastened to a fixed base by a rotor 11 is enclosed. A stator lamination stack 10a of the stator 10 is clearly shown in FIG. 2 and windings 10b. Power is supplied via a Connection cable 12.

An outer contour 13 of the motor 1, in particular an outer contour of the rotor 11 of the motor 1 designed as an external rotor forms an interference fit with the jacket 6 of the tubular receptacle 3 of the cover plate 5 of the fan wheel 2.

In the jacket 6 of the tubular receptacle 3 for the motor 1 are according to the invention Extending radially outward over the entire length L of the receptacle 3 Bulges 14 arranged. Through this bead-shaped bulges 14 on the one hand, an optimal drainage of condensate or other water accumulations guaranteed and on the other hand a secure attachment of the Fan wheel 2 ensured on the rotor 11 of the motor 1.

It can preferably be two to eight, in particular - as shown - four, preferably with the same distance from each other (in Fig. 2 each by 90 ° offset against each other) act bulges 14 arranged in the jacket 6.

From the side of the fan wheel 2 facing away from the cover disk 5, there is a coaxial Longitudinal axis X-X arranged air inlet 15 with a circular cross section and smaller diameter than the outer diameter DA of the cover plate 5. After the air has passed this air inlet 15, it is passed through between the Blades 4 radially extending, in particular curved air outlet channels 16 out and emerges radially from the fan wheel 2. Due to the formation of condensate in the case of moisture-laden air, water accumulations on the air inlet 15 Form the opposite (upper) side of the (rear) cover plate 5. The arrow P in FIG. 2 denotes the area of the kink, i.e. the transition from the level, or - as shown - plate-shaped, area 8 in the axial, the motor fastening serving Area (intake 3, passage), where it is known that there are holes for Water drainage.

It should also be added that the cover plate 2, in particular in its plane Edge area 7, has passage openings for fastening elements 17 (e.g. pins), the edges 18 of the blades 4 running perpendicular to the longitudinal axis X-X are arranged, with the passage openings and fastening elements 17th a non-positive and / or positive face connection of blades 4 and cover plate can be manufactured.

Other side, i.e. on its (front) side facing away from the cover plate 5 the blades 4 - as shown - by a second, in particular metallic, annular (front) attachable to the blades 4 in a positive and / or non-positive manner Cover plate 20 may be connected to each other. This cover plate 20 can also Have passage openings for fasteners 21 which on the corresponding edges 19 of the blades 4 to be connected to one another are arranged.

As can be seen from the above, this is Invention is not limited to the illustrated embodiment, but includes all means and measures having the same effect in the sense of the invention. That's how they go Bulges 14 in the embodiment shown parallel to the longitudinal axis X-X of Fan wheel 2, but alternatively another one would be, e.g. a helical one Course possible.

Furthermore, it is also, for example, in contrast to the embodiment shown possible that the blades 4 on their front side at their edges 19 by a Uniform material and in one piece with the blades 4 executed ring together are connected, e.g. known from the aforementioned DE 29 19 843 A1 is. Another blade orientation, shape, attachment to the cover disks 5, 20 and / or another air duct falls within the scope of the invention.

reference numeral

1

engine

2

fan

3

Recording 2 for 1, swipe

4

Shovel of 2

5

(rear) cover plate from 2

6

Coat of 3

7

Border area of 5

8th

domed area of 5

9

Flange of 10

10

Stator of 1

10a

Sheet pack of 10

10b

Winding of 10

11

Rotor of 1

12

Connection cable for 1

13

Outer contour of 11

14

Bulges in 6

15

air intake

16

air outlet duct

17

Fasteners on 18 for 5

18

(rear) edge of 4

19

(front) edge of 4

20

(front) cover plate

21

Fasteners on 19 for 20

THERE

Outside diameter of 5

DI

Inner diameter of 5

L

Length of 3

P

kink

X X

Longitudinal axis of 2

Claims (13)

1. Impeller, particularly a centrifugal impeller, having a plurality of blades (4) and having, at an end, a substantially annular cover disc (5) which is arranged substantially perpendicularly to a longitudinal axis (X-X) of the impeller (2) and which, in particular, connects the blades (4), a tubular receptacle (3) for a motor (1) which drives the impeller (2) projecting down from the circumference defining the inside diameter (DI) of the annular cover disc (5), the shell (6) of which receptacle (3) extends co-axially to the longitudinal axis (X-X), characterised in that, arranged in the shell (6) of the tubular receptacle (3) for the motor (1), there are convexities (14) which are curved out radially and extend for the full length (L) of the receptacle (3).
2. Impeller according to claim 1, characterised by two to eight, and in particular four, convexities (14) preferably arranged in the shell (6) at equal distances from one another.
3. Impeller according to claim 1 or 2, characterised in that the convexities (14) extend parallel to the longitudinal axis (X-X).
4. Impeller according to any of claims 1 to 3, characterised in that the cover disc (5) has a dish-like concavity (8) between a plane edge-region (7) bordering the circumference which defines its outside diameter (DA), and the circumference defining its inside diameter (DI).
5. Impeller according to any of claims 1 to 4, characterised in that cover disc (5) is in the form of a bent and stamped part of sheet metal.
6. Impeller according to any of claims 1 to 5, characterised in that, particularly in its plane edge-region (7), the cover disc (5) has openings for the passage of fastening members (17) which are arranged on those edges (18) of the blades (4) which extend substantially perpendicularly to the longitudinal axis (X-X).
7. Impeller according to any of claims 1 to 6, characterised in that, from the end remote from the cover disc (5), there extends an air inlet (15) of circular cross-section arranged co-axially to the longitudinal axis (X-X) and preferably of a diameter smaller than the outside diameter (DA) of the cover disc (5).
8. Impeller according to any of claims 1 to 7, characterised in that radially extending and in particular curved air-outlet passages (16) are formed between the blades (4).
9. Impeller according to any of claims 1 to 8, characterised in that, at their ends remote from the cover disc (5), the blades (4) are connected together at the edges by a ring which is produced in one piece with the blades (4) and from the same material.
10. Impeller according to any of claims 1 to 8, characterised in that, at their ends remote from the cover disc (5), the blades (4) are connected together at the edges by a second, further annular cover disc (20) which is in particular metallic and can be fastened to the blades (4) by positive interengagement and/or non-positively.
11. Blower, particularly a centrifugal blower, having an impeller (2) and a motor (1) driving the impeller (2), characterised by an impeller (2) according to one of claims 1 to 10.
12. Blower according to claim 11, characterised in that the motor (1) is in the form of an external-rotor motor.
13. Blower according to claim 11 or 12, characterised in that an external contour (13) of the motor (1), and in particular an external contour (13) of a rotor (11) of the motor (1) in the form of an external-rotor motor, is a press fit in the tubular receptacle (3) on the cover disc (5) of the impeller (2).

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