Servomechanism for pump capacity control

Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage

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Details

60444, 60447, F04B 4900, F16D 3102

Patent

active

040211541

ABSTRACT:
A servomechanism for pump capacity control includes an adjustable throttle of the "nozzle-gate" type formed with two operating slots communicating through two fixed throttles with duct, a source of supply feeding the duct, an input signal converter whose movable element is connected to the gate of the nozzle-gate throttle and a four-slot, five-line distributor whose control spaces are in communication through two fixed throttles with the duct of the source of supply, two operating slots being formed in the adjustable throttle, whereas its operating spaces communicate with the corresponding spaces of an actuating hydraulic cylinder. The latter is connected to the control element and, by a mechanical position feedback, to the gate. The mechanical position feedback is constituted by a bar which is linked to the movable element of the hydraulic cylinder and has a slanted surface. The slanted surface interacts with a spring-loaded pusher, whose springs act on the gate. The servomechanism incorporates a device which ensures linear dependence of the speed of hydraulic cylinder movement on the displacement of the gate away from the neutral position, and acts on the slide valve of the four-slot five-line distributor. The servomechanism additionally includes a mechanism for limiting the power of the controlled pump, the mechanism being linked mechanically with the hydraulic cylinder and the gate of the nozzle-gate throttle, and hydraulically with the discharge line of the controlled pump.

REFERENCES:
patent: 3065735 (1962-11-01), Chaves et al.
patent: 3270508 (1966-09-01), Smith et al.
patent: 3416452 (1968-12-01), Misulis

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