Rotary kinetic fluid motors or pumps – With means for re-entry of working fluid to blade set – Turbine regenerative pump
Patent
1998-12-08
2000-11-07
Look, Edward K.
Rotary kinetic fluid motors or pumps
With means for re-entry of working fluid to blade set
Turbine regenerative pump
415 557, 237 123R, F04D 2300
Patent
active
061427284
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to a side-channel fan, especially for feeding combustion air in a parking heater or auxiliary heater of a motor vehicle, with a fan body part in an axial connection to an impeller, wherein the fan body part has an inlet channel and an outlet channel and, on the axial connection side of the impeller, a bent side-channel, which connects the inlet channel to the outlet channel, and a separating web, which together form the 360.degree. circumference of the axial connection side.
BACKGROUND OF THE INVENTION
A side-channel fan of the above-described type has been known from DE 42 30 014 C1. The side-channel and the separating web are an integrated part of the fan body. The separating web, which is also called an interrupter, has baffling means in the form of material recesses, e.g., notch-like recesses, which reduce the generation of noise during the operation of the fan.
The difficult and expensive manufacture of the fan body is a drawback. Complex, spatially difficult flow channels or baffling means can be brought about to a limited extent only. Flow optimization and noise optimization and minimization are therefore possible to a limited extent only.
SUMMARY AND OBJECTS OF THE INVENTION
The object of the present invention is to provide a side-channel fan of the above-described type, which makes it possible to optimize the noise and flow with simple means.
According to the invention, a side-channel blower is provided especially for feeding combustion air in a parking heater of a motor vehicle. The blower has a fan body part in an axial connection to an impeller. The fan body part has an inlet channel and an outlet channel and, on the axial connection side of the impeller, a side channel connecting the inlet channel to the outlet channel and a separating web, which together form the 360.degree. circumference of the axial connection side. The separating web is a separate component.
The essence of the present invention is to make the fan body part and the combustion air fan housing in two parts, wherein the separating web between the inlet and outlet is a separate component, especially a separate molding, especially a casting.
As a result, the separating web per se may be shaped in a nearly freely selectable manner, and the side-channel or the ring channel and especially also the inlet and outlet openings per se can also be shaped better. There are more degrees of freedom and more possibilities for optimizing the flow conditions of the combustion air and the generation of noise. According to the state of the art, the one-piece design of a fan body, undercuts at the separating web are possible only conditionally for reasons of the casting technology. The present invention makes possible development variants that are precisely not possible according to the state of the art. In particular, simple development work can be performed on the fan according to the present invention. It is possible, e.g., to use different separating web configurations in the same basic fan body, i.e., the flow conditions are changed in a comparatively simple manner in order to finally obtain an optimal solution.
In a preferred variant of the present invention, the separating web has a flat surface, which is located in the close, contact-free proximity of the impeller.
The flat surface preferably has individual contours, wherein a first contour is associated with the inlet opening of the inlet channel and a second contour is associated with the outlet opening of the outlet channel. The first and second contours may be profiled as desired, e.g., made concave or convex, straight, jagged and/or wave-shaped corresponding to an individual application in order to optimize the flow and noise conditions.
A third, preferably concave, round contour, which adjoins the thrust bearing of the impeller, may be provided between the first and second contours.
A fourth, convex, round contour extends coaxially to the third round contour and preferably forms the extension of a circular outer circumfere
REFERENCES:
patent: 3951567 (1976-04-01), Rohs
Eppler Hermann
Humburg Michael
J. Eberspacher GmbH & Co.
Look Edward K.
McDowell Liam
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