The SNF three-screw fuel booster pump is a type of rotary positive displacement pump, which is widely applied in the field of fuel boosting. The following is the relevant introduction:
Working Principle: The SNF three-screw fuel booster pump utilizes the principle of screw meshing. Relying on the rotating screws that mesh with each other inside the pump casing, the conveyed fuel is enclosed in the meshing cavity and continuously and evenly pushed along the axial direction of the screws to the discharge port, providing a stable pressure for the system. 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. At the same time, the spiral shape of the screws and the meshing clearance between them play a sealing role, preventing the fuel from flowing back inside the pump and ensuring that the fuel can be stably conveyed under a certain pressure.
Structural Features: Generally, it adopts a three-screw structure, 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. The pump casing is usually made of cast iron or cast steel, which has good strength and sealing performance. Bearings are used to support the screws to ensure the stable rotation of the screws, and rolling bearings or sliding bearings can be selected. In order to prevent fuel leakage, a mechanical seal or packing seal device is also equipped.
Performance Advantages:
Uniform and Stable Flow Rate: When the screws 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 Scenarios:
Marine Field: It is used in the main engine and auxiliary engine fuel systems of ships to provide high-pressure fuel for the engines, ensuring the normal operation of the ship engines. It can also be used in the ship fuel transportation system to transport the fuel from the ship's oil storage tanks to various equipment and systems that require fuel.
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. It can also serve as an important part of the standby power supply system. In case of power grid failures or other emergencies, it provides a reliable fuel pressurization supply for standby fuel generators.
Industrial Field: 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. In the combustion systems of some industrial furnaces, such as glass furnaces and ceramic furnaces, it pressurizes the fuel supply to ensure that the fuel can be accurately transported to the burners in a high-temperature and high-pressure environment.
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.
