Air Conditioning System

Abstract

The invention discloses an air conditioning system. The air conditioning system comprises a rotary compressor, an indoor heat exchanger, an outdoor heat exchanger and a throttling mechanism. The throttling mechanism is arranged between the indoor heat exchanger and the outdoor heat exchanger. The rotary compressor They are respectively connected to the indoor heat exchanger and the outdoor heat exchanger, wherein the throttling mechanism is composed of an expansion valve and / or a capillary tube. When the expansion valve is at the maximum opening, the minimum internal flow area of ​​the expansion valve is not greater than 9mm2, and the internal flow of the capillary tube The area is not greater than 9mm2; the rotary compressor contains hydrocarbon refrigerant and refrigerating machine oil, the hydrocarbon refrigerant and refrigerating machine oil form a composition, and the viscosity of the composition at a temperature of 0 degrees Celsius and a pressure of -0.05MPa is not greater than 1100mm2 / s; the viscosity at a temperature of -20 degrees Celsius and a pressure of -0.05MPa is not more than 4200mm2 / s; the viscosity at a temperature of -50 degrees Celsius and a pressure of -0.05MPa is not more than 25000mm2 / s. The use of the composition can effectively prevent the refrigerating machine oil from being brought into the throttling mechanism to block the expansion valve or the capillary, thereby effectively improving the reliability of the air-conditioning system.

Description

technical field [0001] The invention belongs to the field of air conditioning, in particular, the invention relates to an air conditioning system. Background technique [0002] R22 refrigerant has been listed as a phase-out refrigerant by the "Montreal Protocol". Europe and Japan have already begun to switch to R410A refrigerant replacement, and the United States will also ban the use of R22 in new refrigeration products in 2010. China has also accelerated the pace of R22 phase-out, which will be frozen at the average level from 2009 to 2010 in 2013, and the requirement of 10% of the baseline level must be reduced in 2015. And some major domestic brands have also begun to launch environmentally friendly air conditioners with R410A as the refrigerant. However, the GWP value of R410A is larger than that of R22. The "Kyoto Protocol" has listed R410A as a greenhouse gas for controlled emissions. All R410A is by no means a long-term alternative. Hydrocarbon refrigerants have a...

AI Technical Summary

Problems solved by technology

[0003] However, it was found in the development and research that hydrocarbon refrigerants are used in heating and cooling room air conditioner systems with expansion valves as throttling mechanisms. When the ambient temperature is lower than 0°C, the compressor starts, or after the "defrosting" operation is completed, the When the machine is restarted, the air conditioning system cannot work normally, which is mainly manifested by abnormally low power and abnormally low working pressure.

This abnormal situation can last for 30 to 40 minutes, and then it will lead to overheating inside the compressor, causing the compressor motor to burn out, and the compression mechanism to wear out and get stuck.