Many people know the water pump, and this pump is more widely used in our country, including the water used in our lives, agriculture and forestry irrigation. The use of the pump for a long time will have some problems, especially the pump but not water, this situation is a problem we often meet. So today Xiaobian will introduce the pump to you but not water? What is the protection of pump dry rotation? Follow the editor to have a look!
First, the pump turns but does not water
1, for all kinds of pump products, the pump dry rotation is a very bad idling situation, the pump dry rotation does not produce water generally because the liquid elements in the discharge medium are not all or there are bubbles in the normal discharge time, and it is good that a part of the dry rotation usually occurs on the wet rotating parts.
2, if the centrifugal pump structure is more suitable, then in normal operation, the discharge medium will generally fill the entire flow field and the impeller packing seal or mechanical seal in the narrow seal gap, these liquids directly play a lubricating role in the parts, and also in the impeller and pump shaft channel in the throttling gap plus centripetal force, And it makes it possible for long, thin segment pumps to operate without contact.
Second, what is the protection of the pump dry rotation
1, if judging from the operation, it is likely to increase the cost so that the pump will be calculated separately, which also includes strengthening the pump shaft, which can better prevent the radial and pump shell part of the contact.
2, some pumps will also be equipped with a direct pressure relief device to prevent the axial thrust bearing from biting tightly, and can also be equipped with a dry rotation protection device, so that there will be a direct stop when dry rotation, in order to protect the pump.
3, self-priming centrifugal pump must be filled with a certain amount of liquid for self-priming, this type of pump is partially dry when self-priming. The main protection of the pump is to prevent the liquid pump from running when there is no discharge medium state, so in order to monitor the pump with different measurement procedures, if the limit value is exceeded during operation, the system will be shut down directly with the warning, and then automatically or manually restart the system according to the safety needs.
