Push and pull cylinder variable frequency energy-saving hydraulic elevator system of balancing load by accumulator loop

Abstract

An energy-saving hydraulic elevator system is composed of a mechanical system, a master hydraulic loop with vectorial frequency-varying volume control to regulate the rotation speed of motor, and an energy accumulator loop system for balancing the most of the weight of cage system. Said energy accumulator loop can absorb energy when cage is moving down or release energy when cage is moving up.

Description

technical field [0001] The invention relates to a control system of an elevator, in particular to a push-pull cylinder frequency conversion energy-saving hydraulic elevator system adopting an accumulator circuit to balance loads. Background technique [0002] Hydraulic elevators have the advantages of no need for a top-floor machine room, large load capacity, stable and comfortable operation, high safety and reliability, making them cheaper and easier to debug and maintain than traction elevators of the same specification. Therefore, in recent decades, hydraulic elevators have been widely promoted and applied in various countries. [0003] Because the general hydraulic elevator does not have a counterweight, the elevator completely relies on the power system to do work when it goes up, unlike the traction elevator that can rely on the counterweight to provide part of the power, and the efficiency of the hydraulic power system is not high, so the installed capacity of the hyd...

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