Problems caused by cavitation in multi-stage centrifugal pumps

Output flow fluctuation Output flow fluctuation is related to many factors. The overflow valve is faulty or the adjustment pressure is low, and the system pressure cannot rise.

This phenomenon can also be caused by insufficient pump angle maintenance and wear of the tilt angle trunnion. (7) Overheating of the hydraulic pump There are two reasons for the excessive heating of the hydraulic pump. 2. The output pressure is too high. Therefore, the fuel Borehole Pumps Manufacturers tank must be designed correctly, and the oil filter, oil pipe and directional valve must be correctly selected. If the load is constant and the pressure of the pump exceeds the pressure required by the load, the hydraulic components other than the pump, such as directional valves, pressure valves, transmission devices and oil return pipelines, should be checked

 Problems caused by cavitation in multi-stage centrifugal pumps: The main reasons for the cavitation of the pump are the large resistance of the pump inlet pipe, the more gas phase of the conveying medium, the insufficient filling of the pump, and the insufficient energy head of the pump inlet. Multi-stage centrifugal pumps provide lubrication and cooling to the sliding bearing by the conveying medium. a. Security risks. Cavitation is the most harmful to the pump. d

When the required flow is less than the rated flow, the head of the frequency conversion speed regulation is smaller than the valve throttling, so the water supply power required for the frequency conversion speed regulation is also smaller than the valve throttling. But throttling adjustment is to consume the excess energy of the centrifugal pump to maintain a certain supply, and the efficiency of the centrifugal pump will also decrease accordingly, which is not economically reasonable. In addition, the use of frequency conversion speed regulation not only helps to reduce the possibility of cavitation in the centrifugal pump, but also prolongs the start/stop process by presetting the speed up/down time, so that the dynamic torque is greatly reduced.