Centrifugal Oil Pump: Only One Drainage is Required, and the Rest Can Be Self-priming

Centrifugal Oil Pump: Only One Drainage is Required, and the Rest Can Be Self-priming

The centrifugal oil pump has the function of "one-time drainage, life-long self-priming". When used in oil tankers or marine oil pumps, it can also be used as a cleaning pump, and the cleaning effect is good. It has the characteristics of simple structure, convenient operation, stable operation, easy maintenance, high efficiency, long life, and has the self-priming function that other pumps do not have. There is no need for a bottom valve in the pipeline, and it is only necessary to ensure that a certain amount of pilot oil is stored in the pump body before working.

1. The main flow components of centrifugal oil pump are suction chamber, impeller and pressurized water chamber

The water suction chamber is located in front of the water inlet of the impeller, and plays the role of guiding the liquid to the impeller; the water pressure chamber mainly has three forms: spiral pressure water chamber (volute type), guide vane and space guide vane; the impeller is an important part of the pump. The working element is the heart of the flow component, and the impeller consists of a cover plate and a middle blade.

The centrifugal oil pump power device needs to use explosion-proof or explosion-proof motor; the packing used for sealing is deeper than the ordinary pump, and the liquid sealing ring in the soft cushion material adopts normal temperature oil as oil seal or mechanical seal; in order to ensure free thermal expansion, the pump body is vertically split; The impeller and the shaft are of cantilever beam structure and rest on the feet, and the shaft is connected with an elastic coupling; the overcurrent parts of the hot oil pump are made of high temperature resistant materials, and the dynamic and static rings of the packing gland, bracket, bracket and shaft seal are made of water clamps The jacket is cooled; the suction port and the discharge port are upward to discharge the vapor in the pump and improve the cavitation resistance of the pump; the sealing gap of the hot oil pump is larger than that of the cold oil pump to prevent sticking and burning.

Before the centrifugal pump works, first fill the pump with liquid, then start the centrifugal pump, the impeller rotates rapidly, and the blades of the impeller drive the liquid to rotate. When the liquid rotates, it flows to the outer edge of the impeller by inertia. In this process, the liquid in the impeller flows around the blades, and the liquid acts a lift force on the blades during the flow movement, and in turn, the blades act on the liquid with a force equal to and opposite to the lift force, and this force does work on the liquid, The liquid gets energy and flows out of the impeller, at this time, the kinetic energy and pressure energy of the liquid increase.

2. The centrifugal oil pump transfers the mechanical energy of the prime mover to the liquid by the action of the rotating impeller on the liquid

Due to the action of a centrifugal pump, when the liquid flows from the inlet to the outlet of the impeller, its velocity energy and pressure energy are increased. The liquid discharged by the impeller passes through the pressure chamber, and most of the velocity energy can be converted into pressure energy, and then transported along the discharge pipeline. At this time, a vacuum or low pressure is formed at the inlet of the impeller due to the discharge of the liquid, and the liquid in the suction pool is pressed into the inlet of the impeller under the action of the liquid surface pressure (atmospheric pressure), so the rotating impeller is continuously suction and discharge of fluids.