Electric proportion displacement pump with proportional pressure cutoff control device and control method

Abstract

The invention belongs to the field of oil pump opening pressure control adjusting devices and particularly relates to an electric proportion displacement pump with a proportional pressure cutoff control device and a control method. The electric proportion displacement pump comprises an electric proportion displacement pump body, a pressure stabilizing control oil source and a safety valve block. The pressure stabilizing control oil source is communicated with the electric proportion displacement pump through the safety valve block, a control module is connected between the safety valve block and the electric proportion displacement pump, an oil outlet pipe of the pressure stabilizing control oil source is connected with a P1 port of the control module through the safety valve block, a P2 port of the control module is connected with a P port of the electric proportion displacement pump, and an X port of the control module is communicated with a B1 port of the electric proportion displacement pump through a feedback oil pipe. The electric proportion displacement pump is simple in structure and convenient to implement; according to actual use working conditions and hydraulic characteristics, a logic valve and a proportional overflow valve are arranged on the oil control and pressure stabilizing control oil source of a pump outlet, the pump achieves proportional pressure cutoff, and accordingly pressure of the pump outlet undergoes stepless adjustment. By adopting oil line pressure and adjusting a pressure value of the proportional overflow valve, the logic valve forms differential pressure to control reversing of a valve core of the logic valve, and the electric proportion displacement pump is high in efficiency, convenient to operate, safe and reliable.

Description

technical field [0001] The invention belongs to the field of oil pump port pressure control and adjustment devices, and in particular relates to an electric proportional displacement pump with a proportional pressure cut-off control device and a control method. Background technique [0002] In the field of industrial applications, many electric proportional displacement pumps have no pressure cut-off. When we use this kind of pump, the displacement of the pump can be adjusted proportionally, and the actuator can be adjusted steplessly. However, since the pump itself has no pressure cut-off, therefore, The system is not safe, so a safety valve can only be installed at the pump outlet to limit the pressure at the pump outlet. At the same time, by adding a safety valve to limit the pressure at the pump outlet, the pump will still operate under high pressure for a long time, which is not conducive to the long-term work of the pump and also causes energy consumption. Waste, poor ...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the existence of the existing technology that can only limit the pressure of the pump outlet by adding a safety valve at the pump outlet. At the same time, the pressure of the pump outlet is limited by adding a safety valve, and the pump is still operating under high pressure for a long time, which is not conducive to the long-term work of the pump. Problem, propose an electric proportional displacement pump with proportional pressure cut-off control device and its control method

Images