Low idling energy consumption hydraulic power source

Abstract

The hydraulic power source with low idling energy consumption belongs to the field of fluid transmission and control technology, and is one oil supply device designed to lower the energy consumption in the non-work period and partial load work condition of hydraulic system. The present invention consists of hydraulic pump, motor, motor rotation speed controller, energy accumulator, solenoid valve, pressure sensor, displacement sensor, controller, pipeline, executor controlling proportion valve, direction valves and other parts. The present invention features that the hydraulic pump is one constant pressure variable capacity pump with displacement sensor for detecting the displacement of the pump, altering the rotation speed of the pump can reach the composite functions of making the power source possess constant pressure, constant flow and constant power, and lowering the rotation speed in the non-work period and partial load work condition of hydraulic pump can lower the power consumption of the system.

Description

1. Technical field: [0001] The low idling energy consumption hydraulic power source of the invention belongs to the technical field of fluid transmission and control, and is a power source device for providing certain pressure and flow for hydraulic actuators. 2. Background technology: [0002] The hydraulic power source is the unit that provides power for the actuator in the fluid transmission and control system. It converts mechanical energy into hydraulic energy with a certain pressure and flow, which is used to drive hydraulic cylinders and hydraulic motors. The traditional hydraulic power source consists of a fixed-speed electric motor driving a fixed or variable pump. In order to match the load and reduce energy consumption, various forms of variable hydraulic pumps have been developed internationally. Commonly used variable displacement pumps have three forms: constant pressure, constant current and constant power. The working characteristic of the constant pressure...

AI Technical Summary

Problems solved by technology

Compared with the power source composed of quantitative pumps, these three types of pumps have reduced the energy consumption of the system to a certain extent, but the test shows that when the system is in a non-working cycle, such as the pump is in a low-pressure and high-flow discharge work. In other cases, the pump is under high pressure and low flow conditions, and the motor is still running at the rated speed, which will cause a large energy loss

[0003] In order to reduce the energy loss caused by the motor still running at the rated speed during the non-working period, a new trend is to control the flow and pressure of the pump by changing the speed of the hydraulic pump. The control method that has appeared is useful for AC asynchronous motors. By changing Speed ​​controls the output flow and pressure of the quantitative hydraulic pump, European patent, publication number EP 0752304 A1; a variable speed asynchronous motor, combined with a proportional pressure and flow valve and a quantitative pump to form a power source to control the flow and pressure of the supply system, European patent , Publication No. EP 0509 724 A1, their shortcoming is that the dynamic response is relatively slow; in the German patent DE 3919823 A1, the output flow and pressure of the quantitative hydraulic pump are controlled by a servo motor, but the problem is that the cost is high, which affects its promotion and application There are also people in Germany who study the combination of variable speed AC asynchronous motor and electronic proportional control variable displacement hydraulic pump to control the output flow and pressure of the pump. The disadvantages are still high cost and the system is very complicated.

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