Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Radially extending web or end plate
Patent
1993-09-23
1995-12-26
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Rotor having flow confining or deflecting web, shroud or...
Radially extending web or end plate
416189, 416241A, F04D 2928
Patent
active
054782066
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an impeller for a radial fan, and in particular, for electric motor-driven hand-held machine tools or the like electric tool. Impellers of this type, in which the rotor blades are curved in a two-dimensional manner, are known. Although costly to produce such impellers have the disadvantage of low output.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an impeller for a radial fan, which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in an impeller for a radial fan, which has a hub with a plurality of rotor blades wherein in accordance with the present invention every rotor blade is constructed so as to be curved three-dimensionally, at least within some areas.
When the impeller for a radial fan is designed in accordance with the present invention, it has the advantage over the prior art that a higher output in addition to a greater air throughput, improved efficiency, reduced noise, and reduced blade wear due to abrasive dust can be achieved within the same constructional space.
In accordance with another feature of the present invention every rotor blade of the impeller has a primary part located in an inflow region and curved in various ways, a center part connected to the primary part and forming a surface which is as uniform and free of gaps as possible, and a secondary part which is also curved in certain ways.
In accordance with a further feature of the present invention a guide ring adjoining the rotor blades can be provided and formed for example of one piece with the rotor blades.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a schematic side view in partial section of a part of an impeller for a radial fan;
FIGS. 2 and 3, respectively, show a schematic view of a part of the impeller in arrow directions II and III in FIG. 1;
FIGS. 4 and 5, respectively, show a schematic view of a part of the impeller roughly corresponding to that shown in FIG. 2 in different constructions; and
FIGS. 6 and 7 show a guide ring associated with the impeller blades.
FIGS. 8 and 9 are views showing further details of the inventive impeller.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 is a schematic view of an impeller 10 suitable for a radial fan, radial blower or the like and particularly for fans for electric motor-driven hand-held tools or the like electric tools. The impeller 10 serves, fore example, to cool the motor, as a dust exhaust or the like. In particular, the impeller 10 has a hub 11 and a plurality of rotor blades 12. The rotor blades 12 are curved three-dimensionally at least within some areas. Consequently, compared to known blades which are curved in two dimensions, a greater air throughput, decreased noise, reduced blade wear due to abrasive dust or the like, improved efficiency, reduced constructional volume, and reduced expenditure on manufacture, in particular lower production costs, are achieved.
Details of the curvature of the rotor blades 12 which is three-dimensional at least within some areas are described in the following. Each rotor blade 12 has a primary part 13 located in the inflow region. This primary part 13 is curved to the left or to the right as considered in direction of rotation, at least partially, out of a diametrical plane, where the radius of curvature of the blade is R1 for example. The impeller 10 can be fastened by its hub 11 to a shaft 15, e.g. of an electric motor, a hand-held machine tool or the like, and the longit
REFERENCES:
patent: 2301857 (1942-11-01), Criqui
patent: 2399852 (1946-05-01), Campbell
patent: 3782851 (1974-01-01), Hackbarth
patent: 4543041 (1985-09-01), French et al.
patent: 4566852 (1986-01-01), Hauser
Look Edward K.
Robert & Bosch GmbH
Striker Michael J.
Verdier Christopher
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