Positive displacement fluid motor with flexible blades

Rotary expansible chamber devices – Non-metallic working member – cylinder or partition – Resilient

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418156, F03C 230

Patent

active

054565855

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a fluid motor having a shaft which is operated by means of a flowing fluid, e.g. for measuring of fluid, and having a rotor mounted in a housing having a number of blades mounted regularly around the bearing shaft, each blade composed by a stiff blade of metal and a flexible, elastomeric part.


BACKGROUND ART

For volume measurement of flowing fluid it is known to use a rotor with blades mounted in a housing, which blades are pivotally connected with a rotor body and which are forcibly guided in such a way that over one part of the cylindrical wall of the housing they are turned towards this to form a barrier between the inlet and outlet port, and over another part of the cylindrical wall of the housing having a smaller diameter than the former they are deflected backwards relative to the rotating direction to form a sealing between this part of the cylindrical wall and the rotor. The known devices of this kind, e.g. water meters, are relatively expensive to produce and repair, the blades being difficult to exchange piece by piece, for which reason it is often necessary to exchange the whole rotor. In many cases the rotor provides an undesired, great resistance against rotation, too. Yet another drawback of some of the known liquid meters is that the pivotally connected blades have a tendency to stick when the device has not been used for a longer period of time, and that they are noise generating.
However, from U.S. Pat. No. 2,753,809 a motor or pump is known, the rotor of which is provided with blades where a metal plate is mounted along the flexible elastomeric blade part to reinforce this part which is constituted by an extending tab on an elastomeric base embedded in a groove in the rotor. By this construction a relatively great amount of elastomeric material for each blade is involved, and in connection with abrasion of the material it is necessary to renew the whole blade.
Besides, from U.S. Pat. Nos. 2,636,478 and 2,636,479 liquid meters are known where wings of flexible material are extending practically from the center of the hub to the circumference and which are supported by intricately constructed metal parts. Also by this construction it is difficult to exchange worn parts piece by piece, and furthermore, the wings, which slide against the wall of the housing, involve a relatively great resistance against the movement of the rotor in the housing.


DISCLOSURE OF THE INVENTION

It is the object of the present invention to provide a fluid motor of the kind referred to initially having a rotor, the production of which is connected with low costs, is smooth-running, noise-free and inexpensive to repair because the worn parts are easily exchangeable. A rotor having these properties is not only desired in any volume meter which is to operate with a great accuracy, e.g. in order to secure an exact blending ratio in a dosage apparatus, but also in an apparatus where the rotor has to function as a driving or turbine wheel.
The fluid motor according to the present invention is characterized in that the elastomeric parts of the blades are plate-formed wings mounted at the radially outer ends of the stiff blades, each wing with a thin, flexible part fixed to and overlapping the outer end of the blade on the side thereof facing backwards relative to the rotating direction, whereas the part of the wing lying radially outside the stiff blade has a greater plate thickness and at the interface to the flexible part overlaps the edge of the blade.
A rotor like that is smooth-running, and without generating serious resistance the wings are able to move tightly closing along a wall in the housing concentric to the rotor shaft and can also without serious resistance be folded and tightly closing follow the wall of the housing placed closer to the shaft and form a barrier between the inlet and outlet of the housing. Where the housing of the rotor functions as a mixing chamber, to which a dosed admixture is introduced, it is besides an advantage that the wings gener

REFERENCES:
patent: 2636478 (1953-04-01), Smyser
patent: 2636479 (1953-04-01), Smyser
patent: 2753809 (1956-07-01), Garrison
patent: 2882868 (1959-04-01), Smyser
patent: 3054355 (1962-09-01), Neely
patent: 3169841 (1965-02-01), Weis
patent: 3510229 (1970-05-01), Smith

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