Precise defrosting intelligent control method and system for air-conditioning refrigerator

Abstract

The invention discloses an accurate defrosting intelligent control method and system for air conditioners and refrigerators. The intelligent control method comprises the following implementation steps that defrosting starting power and defrosting stop power corresponding to a target fan of controlled equipment are set, the controlled equipment is an air conditioner or a refrigerator, and the target fan is an outdoor unit fan of the air conditioner or an evaporator fan of the refrigerator; and the operation power of the target fan is detected in real time in the work process, when the operation power of the target fan reaches the defrosting starting power, defrosting of blades of the controlled equipment is started, and when the operation power of the target fan reaches the defrosting stop power, defrosting of the blades of the controlled equipment is stopped. The intelligent control system comprises a power setting unit and a defrosting control unit. The accurate defrosting intelligent control method and system for air conditioners and refrigerators have the advantages that defrosting control accuracy is high, wrong operation caused by inaccuracy of measurement in an existing defrosting mode can be avoided, and the operation energy consumption of the air conditioners and the refrigerators can be lowered as much as possible.

Description

technical field [0001] The invention relates to the defrosting technology of an air-conditioning refrigerator, in particular to an intelligent control method and system for precise defrosting of an air-conditioning refrigerator. Background technique [0002] When air conditioners and refrigerators are refrigerated, the compressor first compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant and flows into the condenser. After being condensed by the condenser, it becomes a high-temperature and high-pressure liquid refrigerant, which flows into the expansion valve after being dried and filtered. Throttling becomes a low-temperature and low-pressure liquid refrigerant, which flows into the evaporator, absorbs the heat of the air flowing through the evaporator in the evaporator, lowers the air temperature, and the evaporator fan blows cold air to produce a cooling effect. During the entire refrigeration pr...

AI Technical Summary

Problems solved by technology

However, although defrosting is a very simple matter, you only need to heat the fins to melt the frost, and with the rapid development of current science and technology, people have adopted many methods to defrost, but because the specific situation of frosting cannot be detected , such as whether frost has formed, the thickness of the frost, the degree to which the gap between the fins is covered by frost, etc. The unclear situation leads to the general blindness of the existing defrosting technology. When is the best defrosting effect? How long is the best time to defrost? What is the most energy-saving defrosting power control? ..., due to the existence of these unknown uncertainties, defrosting has become a mechanical and imaginary action

Therefore, the overall efficiency of various existing defrosting methods is not good. Some defrosting technologies consume too much energy, while others are too expensive to be popularized. Therefore, how to use high-efficiency and low-cost technologies for defrosting, Become the difficulty and hotspot that needs to be overcome in today's world science and technology

[0007] At present, there are mainly the following defrosting control methods: (1) Timed defrosting method: it cannot feedback the influence of heat and humidity load well, and it is easy to cause premature or late defrosting operation, resulting in increased energy consumption

(2) Time-temperature control method: This method adds a temperature monitoring circuit on the basis of timing defrosting. Although the defrosting effect is improved, there are still premature or late defrosting operations. At the same time, due to It cannot reflect the temperature change of the refrigerator environment, and the corresponding large-capacity refrigerator is easily affected by disturbances such as the opening and closing of the air door, and cannot accurately find the ideal defrosting entry point, resulting in defrosting delays, defrosting, etc.

[0010] The Chinese patent document with the Chinese patent application number CN201510980937.4 discloses a heat pump defrosting control method. This technical solution also adopts the time-temperature control method: real-time detection of the coil temperature of the evaporator, as long as the coil temperature is lower than the preset The first coil temperature threshold, then start to accumulate time, as long as the coil temperature is higher than the preset value higher than the first coil temperature threshold, it must be worth the second coil temperature threshold, then stop the accumulated time, and as long as the coil temperature is high If the preset temperature threshold of the third coil is higher than the temperature threshold of the second coil by a certain value, the previous accumulated time will be cleared. This technical solution indirectly calculates the frosting situation through time and temperature, and there is a problem of inaccurate judgment. , leading to disordered defrost control

Images