Glossary
Triple Screw Pump/Three-Screw Pump
Its main components consist of one driving screw and two driven screws meshing with each other. As the screws rotate, fluid is pressed into the pump chamber by atmospheric pressure difference, and then moves along the spiral grooves toward the pump outlet for transportation. It is a positive displacement pump used to convey lubricating fluids that contain no abrasive particles or corrosive substances.
Positive Displacement Pump
A type of pump that transports fluid by changing the volume of the pump chamber, featuring stable flow rate which is not significantly affected by the outlet pressure.
Drive Screw
The core component in a triple screw pump that provides power and drives the driven screw to rotate.
Driven Screw
An auxiliary rotating component that meshes with the driving screw to form a sealed chamber.
Low Pulsation
Key Advantages of Triple Screw Pumps: Low pulsation refers to the characteristic of small fluctuations in pressure or flow during fluid transportation, enabling more stable operation and higher efficiency.
Self-priming
Self-priming is one of the characteristics of three-screw pumps, referring to the pump’s ability to automatically discharge gas from the suction pipeline and fill it with liquid without pre-filling during startup.
Flow Rate
The volume of fluid delivered by the pump per unit time, with common units including m³/h (cubic meters per hour), L/min (liters per minute), and GPM (gallons per minute). 0.06 m³/h ≈ 1 L/min = 0.264 US GPM = 0.22 UK GPM.
Discharge Pressure
The outlet pressure of the pump under rated operating conditions, with common units including bar, MPa, and psi. 1 bar = 0.1 MPa = 14.5 psi.
Fluid viscosity
The kinematic viscosity of the delivered fluid, with common units including cSt (centistokes) and mm²/s (square millimeters per second). 1 cSt = 1 mm²/s.
Rotational Speed
Screw rotation speed, with the commonly used unit rpm (revolutions per minute), affects the delivery flow rate and the service life of the pump.
Ignition Fuel Pump
It is a high-pressure triple screw pump (Series A3MG) designed specifically for ignition systems. It is mainly used in boiler ignition systems, burner supercharging, and auxiliary combustion systems in ships and power plants. The key features of the ignition fuel pump include high working pressure; providing stable fuel pressure to ensure reliable ignition; and achieving excellent fuel atomization for more complete combustion.
Lubricating Oil Pump
It provides reliable lubricating oil delivery service for industrial machinery and equipment. The triple screw pump (Series A3NG) can ensure stable oil supply.
High Pressure Coolant Pump
It is specially designed to supply high-pressure cooling lubricants (coolant, cooling oil, dilute solution, etc.) for machine tools(Series A3MT). They are especially used for washing, cooling, lubrication, chip breaking and chip removal of machining processes including turning, milling, drilling, grinding, etc.
Pump Core/Pump Assembly
The pump core (or pump assembly) is the core functional component of the triple screw pump, integrating key parts such as the driving screw, driven screws and bushing. Manufactured with high-precision machining and wear-resistant materials (e.g., alloy steel, engineering plastics), it directly determines the pump’s delivery efficiency, pressure stability and service life.
Pump Casing
The outer casing that encloses the pump core functions to seal, fix and guide the fluid.
Mechanical Seal
A sealing component that prevents fluid leakage at the pump shaft, replacing the traditional packing seal.
Safety Valve
An overload protection component for the pump body, which automatically relieves pressure when the pressure exceeds the rated value.
Cavitation
Air bubbles mixed in the oil are compressed to form explosions, resulting in the damage and erosion of component surfaces.
Wear
Loss of screws, bearings and other components caused by long-term operation, which affects the pump’s performance.
Wear Parts
Parts that require regular replacement during long-term use, such as mechanical seals, bearings, and O-rings.
Performance Degradation
A decrease in pump parameters such as flow rate and pressure, which can be restored through maintenance or component replacement.