Hybrid construction machinery hydraulic system and hybrid construction machinery

Abstract

The invention discloses a hydraulic system of a hybrid engineering machine and a hybrid engineering machine, which relate to the field of engineering machinery and are used for optimizing the performance of the hydraulic system of the hybrid engineering machine. The hydraulic system includes a pump, a switching valve group, a cooler, an actuator and an accumulator. The pump is configured to pump oil; a switching valve group is in fluid communication with the pump, and the switching valve group is configured to have two valve positions. The cooler is in fluid communication with the switching valve group; when the switching valve group is at the first valve position, the oil passage between the pump and the cooler is conducted. The actuator is in fluid communication with the switching valve group; when the switching valve group is in the second valve position, the oil passage between the pump and the actuator is conducted. The accumulator is configured to recover the gravitational potential energy or the oil released by the rotational kinetic energy of the hybrid construction machine, and the accumulator is in fluid communication with the actuator to drive the actuator to work. The above technical proposal optimizes the performance of the hydraulic system.

Description

technical field [0001] The invention relates to the field of construction machinery, in particular to a hybrid construction machinery hydraulic system and a hybrid construction machinery. Background technique [0002] Excavators, grabbers and other construction machinery with booms, the boom's ascent and descent are controlled by oil cylinders. During the lowering of the boom, the gravitational potential energy of the working device is converted into thermal energy loss, resulting in a waste of energy. In order to utilize the gravitational potential energy of the working device, the construction machinery will add an accumulator to store the gravitational potential energy of the working device. [0003] The inventor found that the prior art has at least the following problems: the energy stored in the accumulator is limited, and in some cases, the energy in the accumulator is not enough to drive the actuator to work. However, if a separate driving source is provided, the n...

AI Technical Summary

Problems solved by technology

[0003] The inventors have found that there are at least the following problems in the prior art: the energy stored in the accumulator is limited, and in some cases, the energy in the accumulator is not enough to drive the actuator to work

However, if another drive source is installed separately, it will cause an increase in the number of components and an increase in cost, and the drive source also consumes energy, and the energy utilization rate of the entire construction machinery will not be improved much.

Images