low pressure heater drainage pump

NW Low pressure heater drainage pump

NW type drainage pump for low pressure heater is used for conveying the water in low pressure heater for power station. The temperature of liquid transported is not over 120 degrees Celsius except 150NW-90X2 type pump, for which the temperature is not over 130 degrees Celsius. This kind of pump is of good NPSH performance. It is suitable for the condition of lower NPSH.

Structure

The pump consists of stator, rotor, rolling bearing and shaft seal.

1. Stator: consists of pump casing and casing cover etc. jointed with bolts to form the working room. Flanges on both inlet and outlet are horizontally directed.

2. Rotor: consists of shaft, impeller, inducer, and shaft sleeve etc. The shaft transmits the power to the impeller to have it work. On both ends of the shaft there are mounted replaceable shaft sleeve for protecting it.

3. Rolling bearing: consists of bearing body, bearing, bearing gland etc. and used lubricating oil.

4. Shaft seal: packing seal and mechanical seal

Packing seal: consists of packing gland, packing, packing sleeve, packing etc. the liquid inside of the sealing-work room acts as water sealing, cooling, and lubricating. The water for water sealing comes from the pressured water inside of the pump.

Mechanical seal: consists of mechanical seal, mechanical seal gland etc. the rinsing liquid for the mechanical seal comes from the pressured water inside of the pump.

Besides, the pump is actuated directly by the prime mover via an elastic device. The pump can move either CW or CCW viewing from the prime mover.