What Are the Water Filling Methods for Centrifugal Pumps(Part 3)?

6. Vacuum pump filling method

For large and medium-sized pumping stations with a water inlet pipe diameter greater than 300mm, or pumping stations with a high degree of automation requirements, a vacuum pumping device is a commonly used water filling device. It is assembled by vacuum pumps and other equipment. The vacuum pumps often used in irrigation and drainage stations are mostly water ring vacuum pumps.

An eccentric toothed impeller is installed in the cylindrical pump casing of the water ring vacuum pump. The pump casing is filled with circulating water. When vacuuming, the impeller rotates. Under the action of centrifugal force, the circulating water in the pump casing is thrown around the impeller, forming a rotating water ring on the inner wall of the pump casing. Because the impeller is eccentrically installed in the pump casing, the size of the space formed between the water ring and the toothed blades is different. When the impeller rotates clockwise, the space between the two blades of the right half of the impeller gradually increases. Under the closed condition, as the air volume increases, the pressure decreases, forming a vacuum, and the air in the water pump and the pipeline passes through The suction pipe enters the crescent-shaped suction port on the right side of the vacuum pump casing and is sucked into the vacuum pump. The space between the two blades of the left half of the vacuum pump impeller is gradually reduced. Therefore, the air is compressed and the pressure increases, and finally passes through the vacuum pump. The crescent-shaped exhaust port on the left side of the pump casing discharges the vacuum pump and enters the water-gas separation box to separate the circulating water that is carried out before reuse. When the impeller keeps rotating, the vacuum pump continuously sucks and exhausts air, and finally fills the water pump with water.

7. Hand pump filling method

As a kind of reciprocating positive displacement pump, manual pumps are widely used in rural my country. Farmers can use their own manual pumps as vacuum pumps to fill centrifugal pumps with water, which is convenient and economical. The most common usage is: install the hand pump on the suction hole of the centrifugal pump or on the water inlet pipe close to the water pump to pump air and divert water, making it a tool for filling water when the centrifugal pump is turned on, thus eliminating the need for the water pump inlet pipe The bottom valve reduces energy loss and improves the efficiency of the water pump device.

8. Self-diversion and water filling method

For the semi-submerged pump house (that is, the pump station where the height of the inlet pipe and the pump top are below the water surface of the inlet pool), water can be introduced into the pump by itself without manual irrigation. The disadvantage of this type of pumping station is that it does not make full use of the water absorption capacity of the pump. At the same time, the installation elevation of the pump is reduced, which not only increases the amount of foundation excavation but also has less convenient operation and management; but the advantages are also obvious, that is, it is easy to achieve automation and timeliness is strong.

The above information is provided by centrifugal pump factory.