Pumps – Processes
Patent
1989-07-27
1991-04-02
Smith, Leonard E.
Pumps
Processes
417214, 92 84, F04B 906
Patent
active
050044036
ABSTRACT:
A pressure responsive driver couples a reciprocating motor output to a reciprocable piston of a double-acting pump. In one embodiment, the driver comprises a single spring and in another a pair of springs, which transfer reciprocation forces of the motor output to the piston to reciprocate the piston through its pumping strokes. The spring(s) transfers the entirety of the reciprocation forces of the motor output to the piston until a selected outlet pressure from the pump is reached, whereupon the spring(s) compresses to absorb cranking forces and limit maximum pump outlet pressure to about the selected pressure. The reciprocating motion of the motor output is divided between the spring(s) and piston, such that the extent of flexure of the spring(s) is inversely proportional to movement of the piston, whereby the spring(s) takes up any motion of the motor output not used to move the piston. The driver therefore limits pump outlet pressure to about the selected pressure while allowing the motor to operate continuously.
REFERENCES:
patent: 3779669 (1973-12-01), Sommer
patent: 4006797 (1977-02-01), Keske
patent: 4009971 (1977-03-01), Krohn et al.
patent: 4080108 (1978-03-01), Keske et al.
patent: 4527463 (1985-07-01), Albarda
Culbertson Samuel W.
Williams Keith G.
Binks Manufacturing Company
Smith Leonard E.
Szczecina Jr. Eugene L.
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