Refrigerating system adapting to flammable refrigerant and control method of refrigerating system

Abstract

The invention discloses a refrigerating system. The refrigerating system comprises a refrigeration compressor, a four-way reversing valve, an indoor heat exchanger, an outdoor heat exchanger, a dry filter, a throttle mechanism, a solenoid valve on a connecting pipeline between the indoor heat exchanger and the outdoor heat exchanger, an indoor unit fan and an outdoor unit fan, and the indoor heat exchanger and the outdoor heat exchanger are used for heat exchanging of a refrigerant and an environmental medium. The throttle mechanism is closely connected with the solenoid valve, and the positions of the throttle mechanism and the solenoid valve are interchangeable. By reasonable control on running sequence and running time interval of the compressor, the solenoid valve and the two fans, smooth starting and running of the compressor is guaranteed, harm brought by flammable refrigerant accumulation due to the fact that the flammable refrigerant leaks in the period of stop is prevented, refrigerant-side volumes of an outdoor unit and an indoor unit can be effectively separated by the aid of the solenoid valve and the compressor, respective refrigerant amounts of the outdoor unit and the indoor unit are reduced greatly, burning danger possibly caused by refrigerant charge is lowered, and safety of the refrigerating system is improved. The refrigerating system can adopt the flammable refrigerant, and has the advantages of safety and environmental protection.

Description

technical field [0001] The present invention relates to a refrigerating system and its control, in particular to a refrigerating system and its control method suitable for flammable refrigerants used in refrigeration, air conditioning, heat pump and other equipment. Background technique [0002] At present, in small and medium-sized refrigeration, air-conditioning, and heat pump units (such as room air conditioners, unitary air-conditioning units, multi-connected units, etc.), HCFC- 22 is the most widely used refrigerant with the best comprehensive performance as a refrigerant, but HCFC-22 has ODP (Ozone Depletion Potential) value and high GWP (Global Warming Potential) value, which is not friendly to the environment and has been The 19th Conference of the Parties to the Montreal Protocol held in 2007 included substances that were required to be phased out in advance. [0003] For the research on the substitutes of HCFC-22, a lot of research work has been carried out at hom...

AI Technical Summary

Problems solved by technology

In some small and medium-sized refrigeration, air conditioning, heat pump units (such as room air conditioners, unitary air conditioning units, multi-connected units, etc.), capillary or thermal expansion valves (fixed frequency units) and electronic expansion valves (variable frequency units) are usually used as throttling valves. The flow mechanism, capillary tube or thermal expansion valve cannot close the refrigerant flow path from the condenser to the evaporator when the unit is shut down. Therefore, whether these fixed-frequency units are running or shutting down, once the flammable refrigerant leaks outward, It will cause all the flammable refrigerants in the unit to leak out, which will lead to danger; although the electronic expansion valve has the function of closing, it cannot be closed. According to the national standard of electronic expansion valve, when the electronic expansion valve is closed, the allowable leakage Therefore, in fact, when the electronic expansion valve is closed, there is still flammable refrigerant that can leak from the high-pressure condenser side to the low-pressure evaporator side until the two sides reach a pressure balance, and once the pressure on both sides Unbalance will leak from the high-pressure side to the low-pressure side. Therefore, in fact, whether the inverter unit is running or shutting down, once the flammable refrigerant leaks out, it will also cause all the flammable refrigerant in the unit to leak out, thus lead to danger

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