Impeller for a side channel flow machine in particular designed as a side channel blower

Abstract

An impeller for a side channel flow machine has impeller blades. An inlet region of the impeller blade is off-set from the outlet region. The inlet region is connected to the outlet region via a sloped transition region. The impeller allows a high degree of efficiency of the side channel flow machine and can be produced at particularly low cost.

Claims

1. An impeller for a side channel continuous flow machine comprising: a ring of impeller blades that delimit blade chambers, in at least one of the impeller's end sides, the impeller blades each having a radially inner inlet region and a radially outer outlet region in a plan view of an end side of the impeller, the impeller blades being inclined differently in the radially inner inlet region and in the radially outer outlet region, wherein respective edges of the impeller blades that adjoin the end side of the impeller have sections that are offset with respect to one another in the radially inner inlet region and in the radially outer outlet region, and in that the radially inner inlet region and the radially outer outlet region are connected to one another via an inclined transition region, wherein an end of each of the impeller blades that faces away from the impeller's end side has a continuous circular arc that extends entirely from the radially outer outlet region to the radially inner inlet region.

2. The impeller as claimed in claim 1, wherein the radially inner inlet region is inclined more in a rotational direction of the impeller than the radially outer outlet region.

3. The impeller as claimed in claim 2, wherein the impeller blades are substantially planar in the radially inner inlet region and in the radially outer outlet region.

4. The impeller as claimed in claim 3, wherein the respective edges of the impeller blades that adjoin the end side of the impeller resembles a shape of a hyperbolic tangent function.

5. The impeller as claimed in claim 4, wherein the respective edges of the impeller blades that adjoin the end side has a same wall thickness over an entire length of the respective edge.

6. The impeller as claimed in claim 5, wherein at least a portion of the respective edges of the impeller blades that adjoins the end side point toward a center of the impeller.

7. The impeller as claimed in claim 1, wherein the impeller blades are substantially planar in the radially inner inlet region and in the radially outer outlet region.

8. The impeller as claimed in claim 1, wherein each respective edge of the impeller blades that adjoins the end side of the impeller resembles a shape of a hyperbolic tangent function.

9. The impeller as claimed in claim 1, wherein the respective edge of the impeller blades that adjoins the end side has a same wall thickness over an entire length of the respective edge.

10. The impeller as claimed in claim 1, wherein at least a portion of the respective edges of the impeller blades that adjoins the end side point toward a center of the impeller.

11. The impeller as claimed in claim 1, wherein the side channel continuous flow machine is a side channel blower.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The impeller blades might, for example, be inclined in the circumferential direction of the impeller as in the prior art. According to another advantageous development of the invention, however, a contribution is made to further simplifying the manufacturing of the impeller if the edge of the impeller blades which adjoins the end side points toward the center of the impeller in the inlet region and in the outlet region.

(2) The invention allows numerous embodiments. For further clarification of its fundamental principle, one of them is shown in the drawing and will be described in the following text. In the drawings:

(3) FIG. 1 diagrammatically shows a side channel continuous flow machine for extracting gases of a vent;

(4) FIG. 2 prospectively shows a part region of an impeller of the side channel continuous flow machine from FIG. 1; and

(5) FIG. 2a is a blade chamber of the impeller from FIG. 2 on a greatly enlarged scale.

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS

(6) FIG. 1 diagrammatically shows a side channel continuous flow machine 2 driven by an electric motor 1 for extracting gases from a fuel vessel 3. The continuous flow machine 2 has an impeller 6 arranged rotatably in front of a housing wall 4 and is fastened on a shaft 5 of the electric motor 1. The housing wall 4 has an inlet duct 7 and an outlet duct 8. In order to simplify the drawing, the inlet duct 7 and the outlet duct 8 are shown such that they are turned into the plane of the drawing. A partially annular duct 9 is arranged in the housing wall 4. The partially annular duct 9 extends from the inlet duct 7 as far as the outlet duct 8. The impeller 6 has a ring of blade chambers 10 in a manner that lies opposite the partially annular duct 9. The blade chambers 10 will be explained in greater detail with respect to FIG. 2. The inlet duct 7 is connected to an activated carbon filter 11 arranged on the fuel vessel 3. As a result, gases accumulated in the activated carbon filter 11 can be extracted by the side channel continuous flow machine 2. In an alternative embodiment (not shown), the side channel continuous flow machine 2 and the activated carbon filter 11 can also be arranged in such a way that the gases are blown out of the activated carbon filter 11. The activated carbon filter 11 is part of a ventilating device 12 of the fuel vessel 3.

(7) FIG. 2 shows, on an enlarged scale, a part region of the impeller 4 from FIG. 1, which part region has the ring of blade chambers 10. It can be seen here that the blade chambers are delimited by impeller blades 13. For clarification, FIG. 2a shows one of the blade chambers 10 with two impeller blades 13 on a greatly enlarged scale. The impeller blades 13 in each case have an edge 14 that terminates with the end side of the impeller 4, with a radially inner inlet region 15 and a radially outer outlet region 16. The inlet region 15 and the outlet region 16 are arranged offset with respect to one another and are connected to one another via an inclined transition region 17. In a plan view of the impeller 6, the edge 14, which adjoins the end side, has the shape of a hyperbolic tangent function. That end of the edge 14 that faces away from the end side has a continuous circular arc 18. As a result, the impeller blades 13 are inclined to a differently pronounced extent with respect to the rotational direction of the impeller 4 in the inlet region 15 and in the outlet region 16. Furthermore, FIG. 2 shows that the edge 14 of the impeller blades 13 which adjoins the end side points into the center of the impeller 4 with the inlet regions 15 and the outlet regions 16.

(8) Thus, while there have shown and described and pointed out fundamental novel features of the invention as applied to a preferred embodiment thereof, it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit of the invention. For example, it is expressly intended that all combinations of those elements and/or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Moreover, it should be recognized that structures and/or elements and/or method steps shown and/or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.