The screw pump relies on one or several screws meshing with each other to form a space whose volume continuously changes to transport liquid. According to the number of intermeshing screws, it can be divided into single screw pump, twin screw pump, three screw pump and so on. According to the position of the screw, it can be divided into vertical or horizontal type. Among them, the outdoor meshing screw pump of the twin-screw pump consists of a pump body, a driving rod, a driven rod, gears and bearings. One of the driving rod and the driven rod has a left-hand thread and the other a right-hand thread.

The screw pump relies on the meshing of the screw teeth of several screws, and the space volume between the screw teeth is formed to transport liquid when the screw rotates.

The difference between it and the centrifugal pump is that it has a constant volume, that is, the flow rate does not change with the outlet pressure and is basically constant. The difference from the plunger pump is that the flow rate is large but the pressure is low.

Applications include chemical and petrochemical industries.

1. Features:

The 3G three-screw pump is a rotor-type positive displacement pump. Due to the mutual meshing of the spiral grooves on the driving screw and the driven screw and their interaction with the inner surface of the three holes of the bushing, With the cooperation, several levels of dynamic seal chambers can be formed between the inlet and outlet of the pump. These dynamic seal chambers will continuously move the liquid axially from the pump inlet to the pump outlet, and increase the pressure of the delivered liquid step by step, thus forming a Continuous, smooth, axial movement of pressure fluid.

2. Applicable media and performance range:

The liquid delivered by the three-screw pump is a variety of lubricating liquids that do not contain solid particles, corrosive oils and similar oils. The viscosity of the infusion liquid is 1.2~100°E (3.0~760cst), and high-viscosity liquids can also be transported after being heated and reduced in viscosity. The flow range is 0.2~590m3/h, the maximum working pressure is 100bar, and the maximum temperature is 150℃.

3. Structure:

1. Simple structure: It has a variety of structural forms, generally small flow 0.2~6.5m3/h, the pump body and bushing are integrated into one ( (collectively referred to as the pump body), the shaft seal is a mechanical seal.

The bushing of pumps with medium flow and above is a separate part fixed in the pump body. Large flow pumps are mostly made of double-suction structure and installed horizontally. The shaft seal has mechanical seals and packing seals depending on the transmission medium. Two kinds.

Marine pumps are installed in two types: horizontal and vertical. The prime mover is an AC or DC marine motor.

2. Long service life: The active screw of the three-screw pump is driven by an electric motor. There is no mechanical contact between the main and slave rods. Instead, the supplied pressure liquid drives the slave rod to rotate around the axis. There is a layer of oil film protection between the rods and between the screw and the bushing, so the mechanical friction of the pump is extremely small and the service life is semi-permanent.

3. The delivered liquid moves in an axial and uniform linear motion in the pump, so the pressure pulsation is small, the flow is stable, and the noise is low. Since the inertia of the rotating parts is small, the starting torque and vibration are very small.

4. It has high inhalation capacity.

5. In order to ensure the safety of the pump, motor and piping system, screw pumps with medium flow 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 pump. Oil inlet.

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