Method for effectively preventing water pump from generating cavitation phenomenon

Abstract

The invention relates to the technical field of water pumps, in particular to a method for effectively preventing a water pump from generating a cavitation phenomenon. The method comprises the following steps of finding out the first water pump net positive suction head NPSHr according to a model selection parameter table of a first water pump; measuring the height difference delta h between an inlet of the first water pump and the liquid level of a water tower communicated with the first water pump, and calculating the resistance loss Hf between the liquid level of the water tower and the first water pump; according to the height difference delta h and the resistance loss Hf, performing calculation to obtain the device net positive suction head NPSHa; and calculating a pressure compensation amount delta P according to the first water pump net positive suction head NPSHr and the device net positive suction head NPSHa. The device net positive suction head of the first water pump is calculated in detail according to the operation conditions of the first water pump under various working conditions, so that the pressure compensation amount is calculated, the pressure value of the firstwater pump is supplemented by assembling a corresponding second water pump, and the cavitation phenomenon of the first water pump is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of water pumps, in particular to a method for effectively preventing cavitation of water pumps. Background technique [0002] Cooling water pumps are widely used in industrial and commercial fields such as central air conditioning systems, air compressor systems, and vacuum pump systems. Due to its wide range of use, many fields and long time, the stable and safe operation of the cooling water pump plays an important role in the normal operation of the entire system. However, many projects that have been implemented in the market currently have the phenomenon of cavitation caused by the NPSH of the water pump not meeting the installation conditions. The cavitation phenomenon has the hazards of causing vibration and noise of the water pump, destroying the surface of the flow-passing parts, and changing the performance of the pump. [0003] After the project is finalized, we can only start with the water pum...

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Problems solved by technology

[0004] (1) The measures starting from the water pump itself, such as replacing the whole water pump, replacing the water pump impeller or returning the original water pump impeller to the factory for reconstruction, etc., have the defects of high cost and long time;

[0005] (2) Measures starting from the suction device, such as reducing the temperature of the medium, reducing the loss of the pipeline, and increasing the height between the pump inlet and the liquid level, etc., have the disadvantages of being impossible to implement or the transformation is too large and the cost is high

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