Safety control method for lubricating oil of multi-unit air conditioner of screw compressor
A screw compressor oil and screw compressor technology, applied in the direction of refrigeration safety arrangements, refrigerators, refrigeration components, etc., can solve the problem of stagnation, above the safe oil level, or the duration of the oil level below the safe oil level. More than 3 minutes and other problems, to achieve uniform distribution of lubricating oil, safe and reliable operation, and ensure the effect of lubricating oil distribution
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Embodiment 1
[0025] As shown in the drawings, the screw compressor multi-connected air conditioner includes an outdoor unit and a multi-connected indoor unit 7, and the outdoor unit includes three screw compressors 1, an oil-gas separator 4, an air-cooled condenser 5, and a high-pressure liquid storage tank 6 and the gas-liquid separator 8, the oil pools of the screw compressors 1 are only connected by oil balance pipes; the return pipes to the respective return pipes are installed between the bottom of the oil-gas separator 4 and the return pipes of the screw compressor 1 The oil pipe 3 and the oil return electromagnetic valve 3.1 are used to send the lubricating oil at the bottom of the oil-gas separator 4 to the air return pipe of the screw compressor 1; To the gas-liquid separation oil return pipe 9 and solenoid valve 9.1 of the total air return pipe of the screw compressor 1.
[0026] A method for safety control of lubricating oil in multi-connected air conditioners of screw compresso...
Embodiment 2
[0038] A method for safety control of lubricating oil in multi-connected air conditioners of screw compressors, comprising the following steps:
[0039] 1) After the air conditioner unit is powered on, the oil heater 2 of the screw compressor 1 is in the power-on working state to heat the lubricating oil in the oil pool of the screw compressor 1; when the indoor unit 7 of the indoor unit receives the start signal, The control device of the indoor unit 7 sends a start signal to the electric control device of the screw compressor 1;
[0040] 2) When the temperature of the lubricating oil in the oil pool of the screw compressor 1 is ≥22°C, the unloading solenoid valve 10 is opened, and after the pressure difference between the high pressure HP and the low pressure LP satisfies︱HP-LP︱≤△P,△ P is 0.13MPa, start the screw compressor 1; if the temperature of the lubricating oil does not reach the set value, the screw compressor 1 is always in the standby state, and the oil heater 2 is...
Embodiment 3
[0050] A method for safety control of lubricating oil in multi-connected air conditioners of screw compressors, comprising the following steps:
[0051] 1) After the air conditioner unit is powered on, the oil heater 2 of the screw compressor 1 is in the power-on working state to heat the lubricating oil in the oil pool of the screw compressor 1; when the indoor unit 7 of the indoor unit receives the start signal, The control device of the indoor unit 7 sends a start signal to the electric control device of the screw compressor 1;
[0052] 2) When the temperature of the lubricating oil in the oil pool of the screw compressor 1 is ≥22°C, the unloading solenoid valve 10 is opened, and after the pressure difference between the high pressure HP and the low pressure LP satisfies︱HP-LP︱≤△P,△ P is 0.13MPa, start the screw compressor 1; if the temperature of the lubricating oil does not reach the set value, the screw compressor 1 is always in the standby state, and the oil heater 2 is...
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