Regarding how to prevent cavitation
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To prevent cavitation, the following measures are adopted in the pump’s design: a double-suction impeller is used； Increase the inlet area of the impeller ； Increase the width of the blade inlet edge ； Increase the radius of curvature at the bends of the front and rear cover plates of the impeller ； The inlet edge of the blade extends toward the suction side ； The first stage of the impeller is made of cavitation-resistant material ； Let the pre-induction wheel be ； For existing pumps, measures to prevent cavitation include: minimizing the rate of change of the cross-section in the flow area and keeping the wall surfaces smooth ； The resistance of the inhalation tube should be low ； Choose the suction height correctly ； Epoxy resin coating is applied to the cavitation area. I hope someone can explain why adopting the above structure can prevent cavitation in the pump How is it implemented specifically?
As a supplementary note: a water ring vacuum pump is used for the circulating water pump to prevent cavitation during operation.
Reduce the material temperature, increase the diameter of the inlet pipe, and minimize the resistance losses in the inlet pipe as much as possible, such as those caused by pipe length and elbows!
1. Reduce the geometric suction height hg (or increase the geometric backflow height)； 2. Reduce suction losses hc; this can be achieved by increasing the pipe diameter, minimizing the length of the pipelines, as well as reducing the use of elbows and other accessories. 3. Prevent operation at high flow rates for extended periods of time ； 4. At the same speed and flow rate, a double-suction pump is used, as it reduces the inlet flow velocity and thus makes cavitation less likely to occur ； 5. When cavitation occurs in the water pump, the flow rate should be reduced or the pump should operate at a lower speed ； 6. The condition of the water pump’s suction tank has a significant impact on pump cavitation ； 7. For pumps operating under harsh conditions, to avoid cavitation damage, materials resistant to cavitation can be used. 8. The diameter variation of the suction pipe should be minimal, in order to reduce the resistance losses in that pipe as much as possible ； 9. Use the pump in accordance with its designed operating conditions ； 10. Reduce the pressure loss at the pump inlet ； The suction height of the 11 pumps should be selected according to the specified values, and these values must be maintained during production ； 12. When manufacturing replacement parts from materials resistant to cavitation, the surface must have sufficient smoothness.
Cavitation in pumps is an inherent phenomenon, which can be mitigated primarily through proper design of the installation height. Also, exhaust the gas before driving to prevent problems
Structural measures are to reduce the gas content in the liquid and prevent bubble formation. Another aspect is to improve the material of the impeller to make it more resistant to cavitation.
Is there a layer of adhesive on the surface of the impeller to prevent cavitation? Protect the impeller!
Before making a purchase, it is essential to carefully calculate the net positive suction head required by the device, as well as to know the minimum net positive suction head that the pump in question must have; having a sufficient safety margin between these two values is key
This theory is quite correct; only by gaining a thorough understanding of cavitation can one apply this theory skillfully. Cavitation is like a crowd at a market (the water flow); everyone moves forward together, and without any gaps, there is no risk of trampling (cavitation). Suddenly, there was a **vacuum or empty space on the back side of the impeller, and everyone rushed forward. It was already crowded, so trampling accidents became inevitable. Therefore, by understanding the theory of cavitation and its prevention in this way, it becomes much easier to grasp.