초록 ▼

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 pisto

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.

대표청구항 ▼

A pressure responsive driver for coupling a reciprocating output from a motor means to a reciprocable piston of a pump having a fluid inlet and a fluid outlet, wherein the pressure of fluid at the pump outlet is in accordance with the magnitude of reciprocation forces exerted on the piston, said pre

A pressure responsive driver for coupling a reciprocating output from a motor means to a reciprocable piston of a pump having a fluid inlet and a fluid outlet, wherein the pressure of fluid at the pump outlet is in accordance with the magnitude of reciprocation forces exerted on the piston, said pressure responsive driver comprising reciprocable input means adapted for connection to the motor means output for being reciprocated thereby; reciprocable output means adapted for connection to the pump piston to reciprocate the piston; and means for coupling said input means to said output means, said coupling means including a single spring for transferring reciprocation forces exerted on said input means by the motor means output from said input means to said output means in both directions of reciprocation and being responsive to the magnitude of transferred reciprocation forces to limit transferred reciprocation forces to a predetermined magnitude while said input means is reciprocated by the motor means output, whereby reciprocation forces exerted on the pump piston are limited to said predetermined magnitude to limit the pressure of fluid at the pump outlet to a selected maximum pressure.