SYSTEM FOR IMPROVING THE ENERGY EFFICIENCY IN HYDRAULIC SYSTEMS

摘要

The invention relates to a system for improving the energy efficiency in hydraulic systems, comprising at least one working cylinder (58) which, in an operating state, operates as a consumer of hydraulic energy and, in a different operating state, as a generator of hydraulic energy, and a hydraulic accumulator (1) which, in an operating state of the working cylinder (58), can be charged by the same for storing energy and, in a different operating state, can be discharged for delivering energy to the working cylinder (58). The invention is characterized in that at least one hydraulic accumulator is provided in the form of an adjustable hydropneumatic piston accumulator (1), in which are formed a plurality of pressure chambers (19, 21, 23, 25) which adjoin effective surfaces (11, 13, 15, 17) of different sizes on the fluid side of the accumulator piston (5), and an adjusting arrangement (51) is provided which connects a selected pressure chamber (19, 21, 23, 25) or a plurality of selected pressure chambers (19, 21, 23, 25) of the piston accumulator (1) to the working cylinder (58) as a function of the pressure level that prevails respectively on the gas side of the piston accumulator (1) and on the working cylinder (58).

主权项

1. A system for improving the energy efficiency in hydraulic systems, having at least one working cylinder (58), which operates as a consumer of hydraulic energy in one operating state, and as a generator of hydraulic energy in another operating state, and having a hydraulic accumulator (1), which can be charged by the working cylinder for storing energy in one operating state, of the working cylinder (58), and which can be discharged for delivering energy to the working cylinder (58) in another operating state, characterized in that at least one hydraulic accumulator is provided in the form of an adjustable hydropneumatic piston accumulator (1), in which a plurality of pressure chambers (19, 21, 23, 25) are formed, which adjoin effective surfaces (11, 13, 15, 17) of different sizes on the fluid side of the accumulator piston (5), and that an adjustment assembly (51) is provided, which connects a selected pressure chamber (19, 21, 23, 25) or a plurality of selected pressure chambers (19, 21, 23, 25) of the piston accumulator (1) to a working cylinder (58), depending on the respective pressure level that prevails on the gas side of the piston accumulator (1) and at the working cylinder (58).