Rotary expansible chamber devices – Working member has planetary or planetating movement – Non-metallic working member – cylinder or partition
Patent
1987-07-08
1989-06-06
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Non-metallic working member, cylinder or partition
418 60, 418 66, 418131, 418153, 418178, F04C 204, F04C 500, F04C 1100, F04C 1804
Patent
active
048367591
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
(1) Field of the Invention
This invention relates to rotary pumps.
(2) Prior Art
Rubber impeller pumps are commonly used in marine and other applications because of their self-priming ability. This type of pump is found in almost every type of vessel afloat and has been blamed for more engine seizures and failures caused through engine overheating than any other component. The problem with this type of pump is the high friction in the pump due to the impeller vanes' continuous hard contact with the housing and its compression by the cam. The impeller vanes compressed by the cam between the inlet and exhaust ports act as a valve. Damage is also caused by "engine rolling" when a diesel engine stops.
This is caused by compression bouncing the pistons in reverse on stopping, causing the impellor to be turned in reverse. When the engine is started, the impeller is turned in the original direction. When the impeller vanes are turned over during the reversal of direction at least some of the vanes are pinched between the cam and the housing which eventually results in failure of the vane. The broken vanes reduce the capacity of the pump, can damage or break other vanes and can enter the engine block and block the flow causing overheating.
When started dry, the friction can rapidly destroy the impeller and both the impeller and housing are damaged by sand or mud in the water being pumped.
Despite the widespread use of such pumps, their failures are well known.
SUMMARY OF THE PRESENT INVENTION
It is an object of the present invention to provide a rotary pump which is preferably self-priming.
It is a preferred object to provide a pump which is suitable for a wide range of applications and which can provide over a wide range of speeds with a low energy input required.
It is a further preferred object to provide a pump which is chemical resistant, which has a high volume output and where the output can be varied by changing only the cam and rotor.
It is a still further preferred object to provide such a pump which is suitable for high/speed high pressure applications, low speed/high volume applications and as an air compressor.
It is still further preferred object to provide a pump which will pump in either direction and will pump water, chemicals, viscous fluids, compressed air and hydraulic fluids.
Other preferred objects of the present invention will become apparent from the following description.
In a broad aspect the present invention resides in a rotary pump including:
a pump housing with a stator having an inlet port, and an exhaust port;
a rotor, within the stator mounted, on a shaft or a cam on the shaft, the shaft or cam being rotatably mounted in the housing; and
a lobe on the rotor engageable in a recess within the stator to prevent rotation of the rotor, the lobe being intermediate the inlet and exhaust ports; the rotor and lobe being formed of, or coated with, an elastomeric material of different hardness to an elastomeric material forming, or lining, the stator so that the rotor and lobe, and/or the stator, are at least partially compressed as the rotor moves in an orbital path within the stator to form two pumping chambers of variable capacity.
Preferably the housing is formed of cast or extruded metal (e.g. aluminium) or moulded plastics material and the stator comprises a liner of elastomeric material of low Durometer hardness.
Preferably the shaft is mounted substantially co-axially in end plates in the housing and has an eccentric cam rotatably received in an eccentrically or concentrically located bore in the rotor. The rotor or lobe are preferably formed of an elastomeric material of higher Durometer hardness than the stator and the cam, which may be formed integrally with the shaft, is preferably formed of material of higher Durometer hardness than the rotor.
Preferably the lobe acts as a valve to control the flow of fluid through the ports.
BRIEF DESCRIPTION OF THE DRAWINGS
To enable the invention to be fully understood, a number of preferred embodiments will
REFERENCES:
patent: 428740 (1890-05-01), Almond
patent: 1628888 (1927-05-01), Klinge
patent: 1876370 (1932-09-01), Weber
patent: 2237075 (1941-04-01), Kemper
patent: 2313387 (1943-03-01), McArthur et al.
patent: 2578798 (1951-12-01), Gordinier
patent: 3161141 (1964-12-01), Refson
patent: 3265003 (1966-08-01), Kaechele
patent: 3514233 (1970-05-01), Braun
patent: 3978665 (1976-09-01), Yoshioka
Nautical Services Pty. Ltd.
Vrablik John J.
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