Control method for electronic expansion valve, self-adaptive control method for heat pump, and device thereof

Abstract

The invention discloses a control method for an electronic expansion valve, a self-adaptive control method for a heat pump, and a device thereof; wherein, the control method for the electronic expansion valve comprises the steps as follows: S110: the electronic expansion valve is started and initiated; a controller arranges the openness of the electronic expansion valve as an initial value; S120: after starting prearranged time, the controller determines the practical over-heat degree of the electronic expansion valve; S130: controller compares the practical over-heat degree with a destination over-heat degree so as to determine the optimum openness value domain of the electronic expansion valve, and S140: the controller adjusts the openness of the electronic expansion valve to the optimum openness value domain. Therefore, automatic regulation of refrigerant flux and throttling degree of the heat pump device according to the working conditions can be ensured, the system is protected and runs at a best state, the optimum openness of the electronic expansion valve can be quickly gained, the lag time is greatly reduced, and the throttling degree of the system can be adjusted according to the running state.

Description

technical field [0001] The invention relates to a heat pump device and automatic control, in particular to a control method of an electronic expansion valve, a self-adaptive control method and a device of a heat pump device. Background technique [0002] At present, in order to improve energy utilization efficiency, the use of heat pump devices to provide domestic hot water has been paid more and more attention. The purpose of water, and because the system operates at a higher condensation temperature, the reliability of the system is difficult to guarantee. [0003] However, when capillary tubes are used, the refrigerant flow rate and throttling degree cannot be automatically regulated, and often can only meet the requirements of certain working conditions. As a result, the exhaust temperature and pressure of the system are too high under low or high temperature conditions, so that the reliability and safety of the system cannot be guaranteed, and the service life of the s...

AI Technical Summary

Problems solved by technology

[0002] At present, in order to improve energy utilization efficiency, the use of heat pump devices to provide domestic hot water has been paid more and more attention. The purpose of water, and because the system operates at a higher condensation temperature, the reliability of the system is difficult to guarantee

[0003] However, when capillary tubes are used, the refrigerant flow rate and throttling degree cannot be automatically regulated, and often can only meet the requirements of certain working conditions. As a result, the exhaust temperature and pressure of the system are too high under low or high temperature conditions, so that the reliability and safety of the system cannot be guaranteed, and the service life of the system is greatly reduced.

[0004] In addition, for the thermal expansion valve, since it is automatically adjusted according to the superheat degree of the suction end of the system, although it has improved compared with the capillary tube, the adjustment process is obviously lagging behind, and it cannot effectively ensure that the system operates in the most suitable state, especially the operation of the heat pump device. When the state is changing in real time, the lag in the adjustment process often leads to a decrease in system performance, and it cannot quickly adapt to changes in various working conditions

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