Abstract
Overflow loss is one of the main reasons for the inefficiency of the hydraulic system. Aiming at the overflow loss in the hydraulic system, an energy recovery system based on a hydraulic motor and generator is proposed. Further, a pressure monitoring and control strategy based on variable speed control for electric generator is adopted, which can control the pressure differential between the inlet and outlet of the proportional relief valve as a small value, and achieve the purpose of energy recovery by reducing the loss of the pressure differential between the inlet and outlet of the relief valve. Through establishing a simulation system model and test platform, the stability, step response characteristics and energy saving of the system are studied. The results show that the energy recovery unit at the outlet of the relief valve does not affect the normal operation of the relief valve, but also greatly reduces the pressure regulation deviation. Besides, the efficiency of overflow loss recovery system about is 67%.
Highlights
In order to decrease the overflow pressure loss of the relief valve, by connecting the electrical energy recovery unit at the outlet of the pilot proportional relief valve, the pressure oil overflowing from the main valve port of the relief valve is recovered to the electric energy storage unit through the hydraulic motor and electric generator
If the port K is connected to another remote pressure regulating valve, the hydraulic pressure at the upper end of the main valve core of the relief valve can be regulated by adjusting the spring force of the remote pressure regulating valve, so as to realize the remote control of the overflow pressure of the relief valve
When the oil outlet of the main valve core of the proportional relief valve is connected with the energy recovery unit, there is a cerof the proportional relief valve is connected with the energy recovery unit, there is a certain tain pressure in the energy recovery unit, which makes the oil outlet pressure rise
Summary
A lot of research has been carried out to reduce the overflow loss at home and abroad Most of these studies are from the overall system aspect, reducing the flow through the relief valve by the flow matching between the pump and the load, such as volume control technology [5,6,7], variable frequency technology [8,9], and so on. In order to decrease the overflow pressure loss of the relief valve, by connecting the electrical energy recovery unit at the outlet of the pilot proportional relief valve, the pressure oil overflowing from the main valve port of the relief valve is recovered to the electric energy storage unit through the hydraulic motor and electric generator.
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