Fixed-frequency refrigerant pump inlet cavitation-erosion-resistant system and control method thereof
A refrigerant pump, anti-cavitation technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve problems such as unfavorable on-site installation and product promotion, can not guarantee the avoidance of refrigerant pumps, low reliability, etc., to reduce The effect of refrigerant charge, reduction of design capacity, and reliable operation
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Embodiment 1
[0042] A kind of anti-cavitation system at the inlet of the fixed-frequency refrigerant pump in this embodiment, such as figure 1 As shown, it includes a refrigerant pump 1, a liquid receiver 2, a condenser 3, a fan 4, a refrigerant temperature sensor 5, a refrigerant pressure sensor 6, a liquid level sensor 7, an electric two-way regulating valve 8 and a controller 9; The output end of the receiver 3 is connected to the input end of the liquid accumulator 2, the output end of the liquid accumulator 2 is connected to the input end of the refrigerant pump 1, and the refrigerant temperature sensor 5 and the refrigerant pressure sensor 6 are installed on the refrigerant pump 1 The inlet pipeline of the motor, the electric two-way regulating valve 8 is set on the outlet pipeline of the refrigerant pump 1, the liquid level sensor 7 is connected with the liquid receiver 2, and the fan 4 is connected with the condenser 3; among them, the refrigerant pump 1 and the fan 4 , the refrige...
Embodiment 2
[0050] The control method of a fixed-frequency refrigerant pump inlet anti-cavitation system of this embodiment includes the following points:
[0051]1) When it is detected that the subcooling degree of the refrigerant drops to the lower limit value set for the subcooling degree, start to increase the speed of the fan 4 to increase the subcooling degree of the refrigerant until the subcooling degree of the refrigerant reaches the supercooling degree degree setting value, then stop the speed regulation of the blower fan 4 and keep the current speed constant, and the opening degree of the electric two-way regulating valve 8 remains unchanged during this process;
[0052] 2) If the speed of the fan 4 reaches the maximum value, but the subcooling degree still cannot reach the set value of the supercooling degree, the fan 4 will keep running at the maximum speed, and the opening of the electric two-way regulating valve 8 will remain unchanged;
[0053] 3) If the speed of the fan 4...
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