Accurate control method for electric throttle mechanism of large-cooling-capacity centrifugal unit

• Main Authors: FENG LINPING, GAO TENGFEI, QU YONGHAO, BAI ZHENGBIN, ZHU CUI
• Format: Patent
• Language: Chinese; English
• Published: 10.01.2023
• Subjects: BLASTING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; HEATING; LIGHTING; LIQUEFACTION SOLIDIFICATION OF GASES; MANUFACTURE OR STORAGE OF ICE; MECHANICAL ENGINEERING; REFRIGERATION MACHINES, PLANTS OR SYSTEMS; REFRIGERATION OR COOLING; WEAPONS

The invention relates to the technical field of water chilling units, in particular to a precise control method for an electric throttle mechanism of a large-cooling-capacity centrifugal unit, and the precise control method comprises the following steps: in a starting stage, an electric control valve is opened to an initial opening degree V0, and when an actually measured temperature difference TL of an evaporator is greater than a temperature difference protection set value Tp, the electric control valve is quickly opened to a temperature difference protection opening degree Vp; in the soft loading stage, guide blades of the compressor are continuously opened, the front and back pressure difference P of the electric control valve and the current percentage Ip of the compressor are continuously increased, and the electric control valve is controlled through the actually measured temperature difference TL value; in the stable operation stage, the microprocessor samples the front and back pressure difference P