Variable-frequency refrigerant pump inlet cavitation-erosion-resistant system and control method thereof

Abstract

The invention relates to the technical field of cavitation-erosion-resistant systems, in particular to a variable-frequency refrigerant pump inlet cavitation-erosion-resistant system and a control method thereof. The variable-frequency refrigerant pump inlet cavitation-erosion-resistant system comprises a refrigerant pump, a liquid accumulator, a condenser, a fan, a refrigerant temperature sensor, a refrigerant pressure sensor, a liquid level sensor and a controller. The output end of the condenser is connected with the input end of the liquid accumulator. The output end of the liquid accumulator is connected with the input end of the refrigerant pump. The refrigerant temperature sensor and the refrigerant pressure sensor are mounted on an inlet pipeline of the refrigerant pump. The liquid level sensor is connected with the liquid accumulator. The fan is connected with the condenser. The refrigerant pump, the fan, the refrigerant temperature sensor, the refrigerant pressure sensor and the liquid level sensor are electrically connected with the controller. Through the cavitation-erosion-resistant system and the control method thereof, the design capacity and refrigerant charge amount of the liquid accumulator can be greatly reduced, meanwhile, the liquid accumulator does not need to be designed in the high position away from a refrigerant pump inlet, and the system is compact in structure, low in cost and reliable in operation.

Description

technical field [0001] The invention relates to the technical field of anti-cavitation systems, in particular to an anti-cavitation system for a variable frequency refrigerant pump inlet and a control method thereof. Background technique [0002] The use of refrigerant pumps in computer room air conditioners to achieve natural cooling and energy saving is a new energy-saving technology that has emerged in recent years. However, there are great technical risks in the application of this technology at present. It is easy to damage the refrigerant pump after a long time. [0003] At present, in order to prevent the cavitation of the refrigerant pump, the existing technology generally installs a large-capacity liquid receiver at the inlet of the refrigerant pump to ensure that there is refrigerant supply in the liquid receiver at any time, and at the same time, the The liquid receiver is hung at a higher height (usually more than 1 meter) to prevent the refrigerant from flashin...

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Problems solved by technology

[0004] With the scheme of the above-mentioned prior art, the design capacity of the liquid receiver is very large, the amount of refrigerant charge is large, and the entire refrigerant pump device is large in size and high in cost, which is not conducive to on-site installation and product promotion, and if refrigerant leakage occurs There is no guarantee to avoid the occurrence of refrigerant pump cavitation, and the reliability is not high.

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