Hot-gas bypass defrosting system for variable-frequency air conditioner

Abstract

The invention provides a hot-gas bypass defrosting system for a variable-frequency air conditioner. Firstly, the exhaust pipe, return gas pipe and condenser coil of a compressor are provided with a temperature detector respectively and are connected with a microcomputer; the temperature detectors transmit detected temperature data into the microcomputer, the microcomputer analyzes and compares received data and controls the progress of hot-gas bypass by detecting the change in exhaust temperature, return gas temperature and condenser coil intermediate temperature parameters according to the characteristic that the variable-frequency air conditioner can intelligently control the operation of a compressor in actual operation. Thus, the phenomenon that defrosting capacity is insufficient in a later half defrosting course is avoided when overlong hot gas bypass time leads to overlow exhaust temperature; compressor liquid hammer is prevented when the return gas temperature is overlow; and due to the introduction of a defrosting compensation phase, the highest defrosting effect of the hot gas bypass is ensured.

Description

Technical field: [0001] The invention relates to the technical field of defrosting of frequency conversion air conditioners, in particular to a hot gas bypass defrosting system for frequency conversion air conditioners. Background technique: [0002] At present, the defrosting method of inverter air conditioners is not only the heat pump defrosting technology with four-way valve reversing, but also the hot gas bypass defrosting method. Among them, in the existing hot gas bypass defrosting technology, the intermediate temperature of the condenser coil after the bypass valve is opened is the direct basis for judging whether the defrosting process is completed or not. However, in this process, because only a small pressure drop occurs in the bypass solenoid valve in the whole system, the pressure difference between high and low pressure is small, so that the input power of the compressor drops rapidly; at this time, the hot refrigerant vapor enters the condenser, due to The te...

AI Technical Summary

Problems solved by technology

However, in this process, because only a small pressure drop occurs in the bypass solenoid valve in the whole system, the pressure difference between high and low pressure is small, so that the input power of the compressor drops rapidly; at this time, the hot refrigerant vapor enters the condenser, due to The temperature of the condenser coil and the ambient temperature are both low. The heat exchange effect of the hot refrigerant vapor in the condenser is excellent. The refrigerant flowing out of the condenser has basically changed from gas to liquid, resulting in low suction temperature and easy liquid hammer

Images