Centrifugal pump control water volume control into the water or out of the water

1. Self-induced water filling method: for the use of semi-submerged pumping station (i.e., intake pipe and pump pump top of the elevation are below the surface of the water intake pool pumping station), the water can be introduced into the pumps without having to artificially fill the water intake. The disadvantage of this pumping station is not fully utilize the pump's suction capacity, while the pump installation elevation is lowered, not only increased the amount of excavation of the foundation, and operation and management is more inconvenient; but the advantages are also more obvious, that is, easy to realize the automation of the pumping station, the timeliness of the stronger.

2. Artificial filling method: for the inlet pipe diameter less than 300mm small pumping station, inlet pipe inlet is usually equipped with a bottom valve, generally more artificial filling method, that is, from the centrifugal pump casing at the upper part of the special water-filled exhaust holes from the water-filled funnels (or an inverted bottle to remove the bottom of the ordinary bottles) filled with water. For the inlet pipe diameter of less than 300mm small pumping station, the inlet pipe inlet is usually equipped with a foot valve, you can also be from the pump outlet (outlet pipe line is shorter pumping station) to the pump filling. Because there is no need to buy other water filling equipment, in the current small rural pumping station, this filling method is more common.

For small pumping stations that do not have a foot valve, backstop valve and short piping, can also be used to start while filling the water from the outlet to the pump, so that the pump and piping air gradually out of the pump, generally a few minutes of continuous charging, the pump can be pumped to work normally.

3. Vacuum tank filling method: for small pumping stations without a foot valve, you can use a vacuum tank filling method. Vacuum tank is welded with iron closed tank, its volume at least 3 times the volume of the water intake pipe, the location of the tank should be installed as close as possible to the pump, the bottom of the tank should be slightly lower than the pump's axis. The height of the vacuum tank is generally 2 times the diameter of the tank.

Before starting the water pump, the water tank is filled with water for sealing. After the pump is started, the water pump is fed from the vacuum box, and a certain vacuum is formed in the water tank due to the drop of the water level in the water tank, and the water in the inlet pool will enter the water tank through the inlet pipe under the action of atmospheric pressure, thus forming the water cycle and making the pump start to run normally.

4. Jet pump filling method: with a diesel engine driven pump pumping, you can use the diesel engine to exclude the exhaust gas into the top of the water pump connected to the jet, pumping water, thus removing the bottom valve of the pump. When the pump is started, the valve cover connected to the handle is closed, and the exhaust gas is ejected from the jet, and the air in the pump is sucked out through the connecting pipe. After filling, the valve cover is opened and the control valve is closed. The advantage of this filling method is to make full use of the power machine, and the second is to improve the efficiency of the pumping station.