The invention discloses a recovered energy utilization
system of an
excavator. The recovered energy utilization
system is mainly composed of a pump-controlled fan
motor loop, an energy-accumulator-controlled fan
motor loop and an energy-accumulator-controlled
drive motor loop. A
hydraulic motor used for independent cooling is directly driven through recovered energy stored in an energy accumulator, no other links exist in the process, and the transmission efficiency is high. Meanwhile, the recovered energy is not coupled with a working oil cylinder or a motor, and the complete-
machine control performance is not influenced. The energy-accumulator-controlled
drive motor loop and the pump-controlled fan
motor loop are designed, and when the environment temperature is low, independent cooling is not needed for
excavator hydraulic oil or an engine cooling water
system or when the energy of the energy accumulator cannot meet the
energy requirement of an independent cooling system. According to the system, the energy-accumulator-controlled fan motor loop can be turned off and switched to the energy-accumulator-controlled
drive motor loop, or the energy-accumulator-controlled drive motor loop can be turned off and switched to the pump-controlled fan motor loop. In this way, the recovered energy can be efficiently utilized, and reliable work of the independent cooling system is also ensured.