Cause and Prevention of Pump Cavitation

1, pump cavitation at the pump inlet, due to high vacuum formed by the vacuum, and high-speed placement of the impeller where the pressure is often so low, which provides the conditions for the evaporation of water. When the pressure is reduced to the vapor pressure of water temperature, a large amount of water vapor bubbles formed by the vaporization flows into the high-pressure area inside the impeller with the non-vaporized water, and the bubbles burst under a high pressure in a very short period of time and recondensate into Water, bubbles around the water rapidly to the center of the bubble burst concentration and have a great impact. This impact on the role of the pump wall, it formed on the pump cavitation.

2, the dangers of pump cavitation Pump wall in the repeated impact of the impact, the first appears pitting, and then into a honeycomb. Severe walls will be hit short in the short term. In the cavitation occurs at the same time, generally accompanied by cracked bubble crackling, roar and vibration. As there is still a part of the bubble is not broken with the water out of the pump, resulting in reduced pump flow. Lifts, efficiency drops, and even interrupts water supply.

3, pump cavitation prevention and treatment

(1) Correctly determine the suction height of the pump to ensure that the pressure at the impeller inlet is not lower than the vapor pressure.

(2) try to reduce the loss of water pipe head. Because of this greater loss, the pressure at the pump inlet decreases more and the water tends to vaporize. So try to shorten the length of the suction pipe to reduce the attachment on the pipe, the pipe wall to be smooth and appropriate to increase the suction pipe diameter.

(3) pump downhole installation. If cavitation is caused by excessive water absorption, install the pump downhole or below the surface, near the water absorption surface.

(4) using jet to increase the pressure on imports.

(5) try to make the pump run under rated conditions. If the pump is operating below the rated head or above the rated speed, the flow through the pump must be greater than the rated flow and the flow rate at the inlet of the impeller will inevitably increase, whereupon the pressure will be further reduced. Therefore, the pump is not free to reduce head and increase speed.

(6) Design and manufacture of reasonable pump impeller inlet shape and size; and can be set at the pump induction wheel, or the use of anti-cavitation materials such as pump parts.

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