Rotary expansible chamber devices – Working member has planetary or planetating movement – Plural working members or chambers
Patent
1996-01-03
1998-01-06
Freay, Charles G.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Plural working members or chambers
418182, 418209, F01C 102
Patent
active
057047740
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a pump, and more particularly to a pump which includes a pair of cylindrical impellers respectively adapted to revolve about a pair of shafts in opposite directions at the same eccentricity with respect to the associated shafts while keeping a constant distance therebetween, thereby obtaining a silent and strong fluid pumping function with a high efficiency.
2. Description of the Prior Art
Generally, conventional pumps achieve a fluid pumping function by rotating blade type, gear type, scroll type or cam type impellers about a fixed axis in a pump body. However, such conventional pumps have a disadvantage of a large consumption of force because of a large movement length of the impeller per suction/delivery stroke, a very large area of impeller in contact with a fluid being discharged, and an intense turbulent contact condition between the impeller and the fluid. Furthermore, the pumps generate a large amount of frictional heat and an abrasion phenomenon. Consequently, they have difficulty achieving a high speed operation and they have a short life span. Since these conventional pumps have a complex impeller construction and a complex impeller chamber construction, they have a limitation on design and application. For example, the pump of the blade type is very difficult and expensive to manufacture its impeller. In particular, the pump of this type is inefficient in pumping out of human waste, waste water including a variety of foreign matters or other fluid including other solid matters because the matters included in the fluid interfere with blades of the impeller, and thereby disturb the pumping action of the impeller. In addition, this pump has an improper construction for discharge of a chemical liquid which should not be exposed to a turbulent flow and to application for a vacuum pump.
In the case of a pump of the type including a cylindrical pump body having check valve means and a piston adapted to reciprocate linearly in the pump body, a low pump efficiency is obtained since it involves a pulsative pumping action which is disadvantageous to the pump efficiency and has a relatively high proportion of ineffective volume between the cylinder head and the piston, which does not contribute to the suction and delivery of fluid. Since the stroke of the piston is relatively long, this pump also has a drawback that it is unreasonably large in size for its pumping capacity.
Korean Paten Publication No. 91-4769 (corresponding to Japanese Patent Application No. Sho 63-126511) discloses a rotary type compressor which operates in a manner similar to that of the pump according to the present invention. This compressor includes a cylinder, a circular rotor arranged in the cylinder to perform an eccentric rotation in a circumferential direction along the inner surface of the cylinder, and a movable blade member adapted to divide the fluid chamber defined between the cylinder and the rotor into a suction-side low pressure space and a delivery-side high pressure space. However, this construction involves a long stroke of the rotor for carrying out one complete pumping cycle because its pumping action is obtained by the eccentric rotation of only one single circular rotor. As a result, a low pump efficiency is obtained. Furthermore, this compressor has a complex construction including a number of weakened parts mainly due to its relatively thin movable blade member for dividing the fluid chamber defined between the rotor and the cylinder into the low pressure-side space and the high pressure-side space and valve means for preventing a reverse flow of fluid from a discharge port during the suction stroke of the rotor. As a result, the compressor involves drawbacks of difficulty in achieving a trouble-free operation under a high pressure and at a high speed, and it has a short life span.
There has also been proposed a vane pump of the type including an eccentrically rotating circular member, a plurality of plate-shaped vanes mounte
REFERENCES:
patent: 720542 (1903-02-01), Wharton
patent: 1041606 (1912-10-01), Dembrowsky
patent: 2103474 (1937-12-01), Lindberg
patent: 2606498 (1952-08-01), Witherell
patent: 3567349 (1971-03-01), Meulendyk
patent: 4371323 (1983-02-01), Fischer et al.
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