Air Conditioning System and Its Frequency Converter Anti-condensation Control Method

Abstract

The present invention provides an air-conditioning system and its frequency converter anti-condensation control method, wherein the air-conditioning system includes an internal machine heat exchanger, an external machine heat exchanger, and a frequency converter in the external machine, and the frequency converter has a supercooling tube , when the air conditioning system is in the heating mode, the refrigerant outlet of the internal unit heat exchanger communicates with the first port of the supercooling pipe through the first throttling element, and the second port of the supercooling pipe passes through the second section The flow element communicates with the refrigerant inlet of the heat exchanger of the external unit, and the subcooling pipe is provided with a first temperature sensor. According to the present invention, the first temperature sensor provided on the supercooling pipe can detect the temperature of the supercooling pipe in real time, and can detect the temperature of the refrigerant in the supercooling pipe more accurately. The control realizes the anti-condensation control of the frequency converter.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to an air conditioning system and a frequency converter anti-condensation control method thereof. Background technique [0002] For household air conditioners and small commercial air conditioners, due to their small power, the air-cooled heat dissipation solution can generally solve the problem of module heat dissipation. However, for a commercial air conditioner with a relatively large cooling capacity, such as a multi-split unit with a rated cooling capacity of about 50kw, its power is high and the module generates a large amount of heat, so it needs to be cooled by refrigerant to meet the heat dissipation requirements. In the cooling mode, the refrigerant condenses from the condenser and cools the IPM heat sink through the supercooling tube to achieve the purpose of cooling the module. Since the temperature of the module is higher than the ambient temperatur...

AI Technical Summary

Problems solved by technology

When the temperature of the control board is lower than the dew point temperature, condensation will occur, and the condensation water will drop on the components, causing the control board to burn out due to a short circuit

[0003] In the prior art, an anti-condensation control method is to use the temperature detection components of the control board (IPM module) to detect the real-time temperature of the control board. Board temperature, which is used as the reference temperature of condensation, may have the problem of condensation on the control board but cannot be detected by the system; The sensor acquires the real-time temperature of the subcooling pipe and combines it with the operating mode of the air-conditioning system to control the on / off of the air-conditioning system, the opening / closing of the first solenoid valve, the opening degree of the indoor solenoid valve, and the opening of the main electronic expansion valve. Adjustment of the opening degree and the opening degree of the auxiliary electronic expansion valve ensures the effect of using the refrigerant to dissipate heat and cool the inverter module, and also ensures the safety risk of no condensation during the cooling process, and also allows the air-conditioning system to get better overcooling To reduce the impact of heat dissipation and cooling on the heating or cooling work of the air conditioning system, but it is equipped with a humidity sensor on the outside, and both ends of the supercooled copper tube of the frequency converter are equipped with temperature sensing packages, the cost of components is high, and the actual application range is small.

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