Working Principle
Volume Change of the Meshing Space: The screw pump is composed of a driving screw and driven screws, which mesh with each other. When the driving screw rotates, it drives the driven screws to rotate synchronously, forming sealed spaces at the meshing points of the screws. As the screws rotate, these sealed spaces move axially from the suction end to the discharge end, and the volume of the spaces gradually decreases, so that the fuel is sucked in from the suction end, pressurized, and then discharged from the discharge end.
Sealing and Conveying: The spiral shape of the screws and the meshing clearance between them play a sealing role, preventing the fuel from flowing back in the pump and ensuring that the fuel can be stably conveyed under a certain pressure.
Structural Features
Screw Structure: Generally, a three-screw structure is adopted, including one driving screw and two driven screws. The driving screw is usually a convex screw, and the driven screws are concave screws. Their spiral surfaces mesh with each other to form a sealed chamber.
Pump Body and Bearings: The pump body is usually made of cast iron or cast steel, which has good strength and sealing performance. The bearings are used to support the screws and ensure the stable rotation of the screws. According to the characteristics of the conveyed medium and the working conditions, rolling bearings or sliding bearings can be selected.
Sealing Device: In order to prevent fuel leakage, the screw pump fuel booster pump is equipped with a mechanical seal or packing seal device.
Performance Advantages
Uniform and Stable Flow Rate: When the screws of the screw pump rotate, the volume change of the sealed chamber is uniform, making the fuel flow rate very stable with minimal pulsation, which can provide a stable fuel supply for the fuel system.
Wide Pressure Range: It can work under different pressures to meet the pressure requirements of various fuel systems.
Strong Self-priming Ability: It has good self-priming performance and can quickly suck the fuel from the fuel tank and convey it under pressure when starting, without the need for an additional fuel priming device.
Low Noise and Small Vibration: Due to the relatively smooth meshing movement of the screws and the small friction and impact inside the pump, the operation noise is low and the vibration is small, which is conducive to reducing the noise pollution during the operation of the equipment and the impact on the surrounding environment.
Application Areas
Marine Industry: It is used in the main engine and auxiliary engine fuel systems of ships to provide high-pressure fuel for the engines and ensure the normal operation of the ship engines.
Power Generation Field: In power plants, it provides pressurized fuel for the burners of fuel generator sets to ensure that the fuel can be fully burned and improve the power generation efficiency.
Industrial Boilers: It pressurizes the fuel supply system of industrial boilers, enabling the fuel to be uniformly and stably injected into the boiler furnace to achieve efficient combustion.
Maintenance Key Points
Regularly Check the Sealing Elements: The sealing elements are key components to prevent fuel leakage. The wear condition of the sealing elements needs to be checked regularly. If the sealing elements are found to be aged or damaged, they should be replaced in a timely manner.
Keep the Oil Clean: The impurities in the fuel will accelerate the wear of the screws and bearings and affect the performance and service life of the pump. Therefore, the fuel filter should be replaced regularly to prevent impurities from entering the pump.
Check the Wear of the Bearings and Screws: Regularly check the wear condition of the bearings and screws. If serious wear is found, the relevant components should be replaced in a timely manner to ensure the normal operation of the pump.
