Electronic expansion valve control method and device and heat pump unit

Abstract

The invention belongs to the technical field of heat pump control, and particularly relates to an electronic expansion valve control method and device and a heat pump unit. The electronic expansion valve control method comprises the steps that an environment temperature TA is acquired, an initial opening degree of an electronic expansion valve is determined according to the environment temperatureTA and a preset initial opening degree rule, then after the electronic expansion valve operates for a first preset duration, a suction superheat degree deviation and a suction superheat degree deviation change rate between a theoretical suction superheat degree SH and a target suction superheat degree SHT are calculated, and finally an opening degree adjustment amount of the electronic expansionvalve is determined according to the superheat degree deviation, the superheat degree deviation change rate and a preset opening degree change table, so as to enable the electronic expansion valve tocarry out opening degree adjustment according to the opening degree adjustment amount. According to the electronic expansion valve control method and device and the heat pump unit, the electronic expansion valve can quickly match a target opening degree after entering automatic adjustment, and therefore the opening degree adjusting efficiency of the electronic expansion valve is improved.

Description

technical field [0001] The invention belongs to the technical field of heat pump control, and in particular relates to an electronic expansion valve control method, device and heat pump unit. Background technique [0002] As the country vigorously promotes coal-to-electricity heating in recent years, the air source heat pump unit used for heating has flourished, and the traditional high-power heating fixed-frequency heat pump unit has gradually withdrawn from household heating due to its characteristics of difficult start-up, loud noise, and frequent start-up. In the market, frequency conversion heat pump units are more and more favored by users. [0003] Heat pump units are usually used for household heating, and the terminal heating equipment can generally be floor heating or radiators. The heat pump unit and the terminal heating equipment use water as the medium to transfer energy. Among them, the heat pump unit directly heats water. During the operation of the heat pump...

AI Technical Summary

Problems solved by technology

[0004] However, when the traditional electronic expansion valve is first turned on, it is adjusted gradually from a small opening, and it usually takes a long time to adjust to a suitable opening.

However, if the electronic expansion valve cannot control the proper opening for a long time, it will easily lead to the problem of liquid back or high exhaust of the equipment

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