Electric Single Suction Fire Pump
The single-suction pump sucks in horizontally and axially, and spit out radially upwards. The pump is a suspension structure, and the rotor parts can be withdrawn for maintenance without disassembling the inlet and outlet pipelines during maintenance. The pump is connected with the motor through a common elastic coupling or an extended elastic coupling, and the shaft seal of the pump is sealed with a soft packing. The bearing is a single row radial ball bearing, lubricated with lubricating oil. From the motor side, the pump rotates clockwise.
The working principle of single suction pump:
When the single-suction pump is started, the pump shaft drives the impeller to rotate together at high speed, forcing the liquid prefilled between the blades to rotate. Under the action of inertial centrifugal force, the liquid moves radially from the center of the impeller to the outer circumference. The liquid obtains energy during the movement of the impeller, the static pressure energy increases, and the flow rate increases. When the liquid leaves the impeller and enters the pump casing, it decelerates due to the gradual expansion of the flow passage in the casing, and part of the kinetic energy is converted into static pressure energy, and finally flows into the discharge pipeline along the tangential direction. Therefore, the volute pump casing is not only a component that collects the liquid flowing out of the impeller, but also an energy conversion device. When the liquid is thrown from the center of the impeller to the periphery, a low pressure area is formed in the center of the impeller, and the liquid is sucked into the center of the impeller under the action of the total potential energy difference between the liquid level of the storage tank and the center of the impeller. Relying on the continuous operation of the impeller, the liquid is continuously sucked and discharged. The mechanical energy obtained by the liquid in the centrifugal pump is ultimately manifested as an increase in the static pressure energy.
