Marine 3G type three screw pump

　
3G three screw pump is used to transport media with temperature ≤ 150 ℃, viscosity 3-760cst, no solid particles, non corrosive, and lubricating properties. 3G three screw pumps are mainly used in fuel transportation, hydraulic engineering machinery industry and heavy machinery industry, shipbuilding and offshore engineering, oil tank and printing and dyeing industry, chemical industry, petrochemical industry and other industries.

Performance parameter table of 3G triple screw pump:

The 3G three screw pump includes 3GR three screw pump, 3GC marine type and special type. This type of 3G screw pump is a rotary displacement pump. Due to the mutual engagement of the spiral grooves on the active screw and the driven screw, as well as their cooperation with the inner surface of the three holes of the liner, several dynamic sealing chambers are formed between the inlet of the 3G screw pump. These dynamic sealing chambers will continuously move the liquid from the inlet of the 3G three screw pump to the pump outlet, and gradually increase the pressure of the delivered liquid, thus forming a continuous, stable, and axially moving pressure liquid in the 3G three screw pump.

The liquid conveyed by the 3G three screw pump is various lubricating liquids that do not contain solid particles, corrosive oils, and similar oils. The viscosity of the conveyed liquid is 1.2-100E (3.0-760cst), and high viscosity liquids can also be transported after heating to reduce viscosity

The flow range of 3G triple screw pump is 0.2-590m/h, with a maximum working pressure of 100bar and a maximum temperature of 150 ℃

1. Simple structure: The 3G screw pump has various structural forms, generally with a small flow rate of 0.2-6.5m/h. The pump body and liner of the 3G three screw pump are combined into one (collectively referred to as the pump body), and the shaft seal is a mechanical seal on the end face. The pump liner of the 3G three screw pump with medium flow rate or above is fixed as a separate part in the pump body. For high flow rate 3G three screw pumps, it is often made into a double suction structure and installed horizontally. The shaft seal has two types: end face mechanical seal and packing seal according to the different conveying media. There are two installation forms for marine 3G three screw pumps: horizontal and vertical, with AC and DC marine electric motors as the prime movers.

2. Long service life: The active screw of the 3G three screw pump is driven by an electric motor, and there is no mechanical contact between the main and auxiliary rods. Instead, it is driven by the transmitted pressure liquid to rotate around the axis. There is a layer of oil film protection between the main and auxiliary rods, as well as between the screw and the liner. Therefore, the mechanical friction of the 3G screw pump is extremely small, and its service life can be considered semi permanent.

3. The liquid being transported undergoes axial uniform linear motion in the 3G three screw pump, resulting in small pressure pulsation, stable flow rate, and low noise. Due to the small inertia of the rotating part of the 3G three screw pump, the starting torque and vibration are very small.

The 4.3G three screw pump has high suction capacity.

To ensure the safety of the 3G three screw pump, motor, and pipeline system, screw pumps with medium flow rates and above are equipped with safety valves. When the pressure exceeds the set pressure of the safety valve. The high-pressure oil will flow back to the inlet of the 3G three screw pump.