Hydraulic circuit including hydraulic pressure reduction energy recovery

Abstract

The invention relates to a hydraulic circuit including hydraulic reduced pressure energy recovery. A hydraulic circuit includes a prime mover configured to generate an oscillatory flow of hydraulic fluid and an actuator driven by the prime mover and configured to provide an oscillatory motion and connected to a load in each direction of the motion. The hydraulic circuit also includes a recovery device disposed in the hydraulic circuit between the prime mover and the actuator. The recovery device captures and stores a portion of the hydraulic fluid displaced from the actuator during a transition between the opposite movements, where the portion of the hydraulic fluid corresponds to an amount of the hydraulic fluid, that is, the amount of hydraulic fluid is equal to the volume of fluid required to compensate for fluid compression within the hydraulic circuit due to system pressure and load pressure. The stored fluid is used by the circuit in subsequent motion.

Description

Background technique [0001] Hydraulic circuits enable the transmission and control of power or signals through fluids, especially liquids, and are used in industrial and mobile applications to transmit power from prime movers to operate machine components or vehicles. A hydraulic circuit consists of several components such as: a prime mover configured to supply pressurized hydraulic fluid to an actuator that converts fluid pressure into mechanical force; and Auxiliary components such as valves, filters, etc. [0002] Because fluids are compressible, the minimum pressure P must be increased min The volume V of the fluid under min , in order to fill the higher pressure P s The system volume under V system . The extra volume is referred to herein as "additional compression volume" V c , thus at pressure P min The volume V of the fluid drawn from the reservoir under min is compressed to a higher pressure P s : [0003] V min = V system +V c [0004] The fluid conta...

AI Technical Summary

Problems solved by technology

In some conventional hydraulic circuits, excess fluid is vented into a reservoir to reduce pressure, essentially wasting energy and generating heat

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