Frequency-varying driving elevator hydraulic control system

Abstract

The present invention provides one effective way for solving the problems of power consumption and temperature raise in valve controlled hydraulic elevator. In the frequency-varying driving hydraulic elevator, voltage-varying and frequency-varying technology is used to control the rotation speed of triphase AC asynchronous motor and thus the output flow rate of the rationing hydraulic pump and the upwards running speed of cage jacked by hydraulic plunger cylinder; or braking moment is provided to control the rotation of the rotioning hydraulic motor and thus the downwards cage speed. The frequency-varying speed-regulating hydraulic control system can lower greatly the elevator power consumption. When frequency converter with feedback function or similar feedback device is used, energy may be fed back to power network for saving power and reaching stable braking.

Description

technical field [0001] The utility model relates to a variable frequency drive elevator liquid control system, which belongs to the field of elevator manufacturing. Background technique [0002] From the creation of hydraulic elevators to the present, it has experienced the development of valve-controlled hydraulic systems to frequency conversion controlled hydraulic systems. The valve-controlled throttling speed regulation system is the most mature technology and the most widely used in the current elevator hydraulic control system. It mainly uses the throttling speed regulation technology in hydraulic technology to control the running speed of hydraulic elevators. Its biggest advantage is that the system is simple. , easy to control. However, the essential characteristics of its ascending bypass throttling load adaptation, self-weight descending energy converted into heat energy loss determine its following defects: [0003] 1) The overflow loss of the throttling speed r...

AI Technical Summary

Problems solved by technology

Lead to low system efficiency and high energy consumption;

[0005] 2) The starting current is large, which has a serious impact on the power grid;

[0006] 3) The temperature rise of the oil quickly leads to the need to use an expensive cooling system to reduce the temperature rise during frequent operation

[0009] 4) The structure of the integrated control valve block is complex and difficult to process

The disadvantage of this solution is that high-precision dynamic two-way flow sensor and electro-hydraulic proportional control valve are required, the cost is high, and the energy-saving function of the frequency conversion speed control system is not fully utilized; and the system structure is not compact

Images