Pumps – Successive stages – With interstage intake or additional inlet to latter stage
Patent
1975-06-27
1977-02-15
Nilson, Robert G.
Pumps
Successive stages
With interstage intake or additional inlet to latter stage
137 99, 417251, 417492, G05D 11035
Patent
active
040080030
ABSTRACT:
There is disclosed a valveless positive displacement pump having a cylinder with a piston reciprocal and rotatable therein and dividing the cylinder into two working chambers. Inlet and outlet ports communicate with the working chambers and the piston has ducts at each end which are sequentially brought into register with the ports as the piston reciprocates and rotates in the cylinder to produce a pumping action in each chamber. A piston rod is secured to the piston and extends from one end of the piston through one of the working chambers to the outside of the cylinder and is connected to a drive mechanism. In certain embodiments of the invention illustrated, means are provided to equalize the output from the two chambers and in other embodiments the fact that the effective volumes of the chambers are unequal is utilized to achieve proportional joining, mixing or separation of fluids handled by the pump.
REFERENCES:
patent: 2034964 (1936-03-01), Thompson
patent: 2887094 (1959-05-01), Krukemeier
patent: 3091186 (1963-05-01), Hofmeister
patent: 3168872 (1965-02-01), Pinkerton
patent: 3495610 (1970-02-01), Van Aken, Jr.
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