Electrical control variable plunger pump and pump control hydraulic system thereof

Abstract

The invention discloses an electrical control variable plunger pump which is composed of a driver (102), electric actuators (101,81), mechanical connecting devices (100, 82), n groups of plunger groups, a cylinder body (87), oil inlet channels (97, 88), oil outlet channels (96, 85); oil inlet valves (88, 90, 95) and oil outlet valves (89, 93, 94), and a pump control system can be formed by matching a controller, an executing mechanism, a feedback system and a loading object; the controller generates control amount according to received external instructions, feedback information and built-in control algorithm; the driver changes the driving current and voltage of the electric actuators according to the control amount; the electric actuators drive the plunger groups to perform the corresponding linear movement to finish the oil intake and oil exhaust through the mechanical connecting devices, the instant displacement of the pump follows the changes of the external instructions, and the control of motion parameters and process changes of the loading object is realized; and the whole pump control system has the advantages of simple structure, rapid response and flexible control strategy.

Description

technical field [0001] The hydraulic system is a fluid power transmission system, which is widely used in various aspects of the industrial field, and the power device of the hydraulic system is its key component, which largely determines the static and dynamic characteristics of the system. The present invention proposes a new type of variable displacement pump and a pump control system using the pump, especially an electronically controlled variable displacement plunger pump and the pump control system for the power device of the hydraulic system. Background technique [0002] The power unit in the existing hydraulic system is mainly a hydraulic pump, which is driven by a prime mover, converts the input electric energy or mechanical energy into hydraulic energy, and delivers it to the system in the form of pressure and flow. Hydraulic pumps are generally driven by (rotating) electric motors, and are also driven by other power machinery (diesel engines, gasoline engines, ga...

AI Technical Summary

Problems solved by technology

The low efficiency of the hydraulic system, high energy consumption, and high heat generation are essentially caused by excess flow. Unnecessary flow must be discharged, resulting in leakage loss and overflow loss. When the required flow cannot be met (excess flow is negative), it will cause insufficient load driving force, power drop, and cavitation may occur

[0010] The existing pump control systems of variable displacement plunger pumps, variable vane pumps or other variable pumps all rely on variable mechanisms to respond to instantaneous changes in the flow demand of the system, and it is very difficult to achieve rapid response. The system is also slow to respond

[0011] In addition, most of the hydraulic system is controlled by throttling, and the reduction of flow and pressure is realized by reducing the orifice. The throttling loss is huge, and it is converted into heat.

However, volumetric speed regulation and frequency conversion speed regulation are due to the low frequency response and slow response of the variable mechanism of the pump and the variable frequency motor itself, resulting in more instantaneous excess flow, and the improvement of dynamic performance is also limited.

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