Flow priority control loop

Abstract

The invention relates to a flow priority control loop. The control loop is provided with an oil inlet, a first working port and a second working port. An adjustable throttling valve and a pressure compensation valve are arranged on an oil way between the oil inlet and the first working port in series. A control oil port of a spring cavity of the pressure compensation valve and a control oil port of a non-spring cavity of the pressure compensation valve communicate with an oil inlet port and an oil outlet port of the adjustable throttling valve correspondingly. A pressure control valve is arranged on an oil way between the oil inlet and the second working port. The opening degree of a valve port of the pressure control valve is related to the oil pressures of the first working port and the oil inlet. The oil pressure of the oil inlet enables the opening degree of the valve port of the pressure control valve to tend to increase, the oil pressure of the first working port enables the opening degree of the valve port of the pressure control valve to tend to decrease, and thus pressure oil supplied through the oil inlet can be supplied to the first working oil port in a prioritized mode. Through the control loop, oil can be supplied to one of the working ports in a prioritized mode, the flow of the control loop can be prevented from being influenced by load changes, and accurate control of a priority valve is achieved.

Description

technical field [0001] The invention relates to a hydraulic control circuit, in particular to a flow priority control circuit. Background technique [0002] In the hydraulic transmission system, the displacement of the hydraulic pump is generally selected according to the requirement of the highest speed under the highest load, and the fixed-quantity pump is often used in consideration of the cost. In fact, construction machinery does not always run at the highest speed. Therefore, in fact, the oil of the hydraulic pump is not fully utilized. The slower the action, the more oil is wasted, and the greater the energy loss, the consequence is increased energy consumption and higher system oil temperature. A hydraulic power element (hydraulic pump) provides hydraulic oil to multiple loads at the same time to drive different functional components at the same time. For such a hydraulic transmission system, since different functional components are connected to each other, the flow...

AI Technical Summary

Problems solved by technology

The valve port opening of the pressure control valve in the flow priority valve mentioned in the patent is related to the oil pressure of the first working port, which provides a constant flow rate for the pressure difference between the two control oil circuits of the pressure control valve. However, a flow control valve is installed on the oil circuit between the oil inlet P and the first working port A, but the method for stabilizing the feedback pressure and the specific solution to the feedback oil pressure loss caused by the flow control valve are not given. The system It has not been taken into account, it cannot guarantee the control stability of the flow priority valve, so it is difficult to ensure the accuracy of the component action

Images