Rotary expansible chamber devices – With changeable working chamber magnitude – Rotating inner working or reacting member repositioned...
Patent
1988-06-16
1990-09-25
Vrablik, John J.
Rotary expansible chamber devices
With changeable working chamber magnitude
Rotating inner working or reacting member repositioned...
418138, 418252, 418256, F04C 2344, F04C 1500
Patent
active
049589920
DESCRIPTION:
BRIEF SUMMARY
The invention refers to a variable capacity swivelling vane pump for conveying liquid or gaseous mediums A large number of different pumps for liquid or gaseous mediums are known, which are demanded by the wide field of application. Positive displacement pumps are enlisted for duties which necessitate a substantially constant conveyed flow which is almost independent from the back pressure. In these pumps a part volume of the conveyed medium which is enclosed in a pumping space is conveyed by pistons, slide plates, diaphragms or by a designed shape of the parts from the inlet to the outlet. In case of incompressible mediums the conveying space is thereby not to be decreased after the shutting off relative to the inlet; in case of compressible mediums (e.g. gases) such may, however, be desirable for a pressure increase. This displacement characteristic leads in piston- or diaphragm pumps to an undesired pulsating of the flow being conveyed, which necessitates pulsating attentuators and/or a plurality of pumps operating at strokes which are unsynchronized per unit time. However, the residual pulsating which still is present prevents an exact measuring of the volume flow. Furthermore, the law of similarity reveals in these designs that an increasing design size results in an exponential increase of the oscillating masses which influences detrimentally the specific weight per horsepower as well as the assembly. Only intrinsic stroke controls or transmissions can be considered for controlling the volume flow. Rotating displacement pumps are here better because they operate practically without any pulsation and comprise no oscillating masses and no valves. Conclusively, high rotational speeds can be attained, which lead to space saving designs, which do not demand large foundations. These pumps have, however, the drawback that the inner leakage is larger than that of piston- or diaphragm pumps and accordingly an upper limit is present regarding the pressure differentials which may be obtained. Due to the small clearances between the rotating and the fixed structural elements or the displacement members engaging into each other most designs are extremely sensitive to abrasive additions. High rubbing speeds of shut-off elements do not allow a conveying of not self-lubricating mediums or a dry run due to wear and sealing reasons. Due to the displacing characteristic the control by throttle which is simple in case of centrifugal pumps cannot be used. For a controlling of the conveyed flow at a constant rotational speed only the common intrinsic methods can be considered in case of piston pumps. A pump which is known from literature only and in accordance with the German patent No. 942314 discloses the following design. The inner cylinder jacket of a cylinder revolving in a case comprises semicylinder shaped bearings for the receipt of vanes having a double-arm design. A loosely revolving rotary piston rotates within the cylinder on a bolt extending eccentrically relative to the cylinder, into which rotary piston the vanes engage by means of sliding flanges having recesses. The drawback of the double-arm design of the vanes is that the number of sealing edges is doubled. Furthermore, they render a complete emptying of the working spaces impossible such that the suction capacity of the pump is decreased. Furthermore, the rectangular design of the vanes engaging into the sliding flanges causes that each sliding flange must consist of two parts which conclusively jam in operation. A further known pump according to the British patent No. 109186 and only known from patent literature foresees the arrangement of a rotatable dog located between the casing and the rotor and having side plates. Vanes are pivoted onto the rotatable dog, which act in the rotor by articulated tips having slots. The synchronous rotating of the rotor with the rotatable dogs and the side plates is caused by pegs arranged at the plates and engaging in the rotor in bores. The rotatable dog is connected to one of the plates and rotates therewith such t
REFERENCES:
patent: Re12183 (1903-12-01), Guindon
patent: 1961592 (1934-06-01), Muller
patent: 2233269 (1941-02-01), Napolitano
patent: 2336344 (1943-12-01), Bullard
patent: 2336476 (1943-12-01), Fulcher
patent: 3190074 (1965-06-01), Johns
patent: 4033299 (1977-07-01), Manzoni
Notron Engineering
Szczecina Eugene L.
Vrablik John J.
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