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Screw Pump

Screw Pump


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Screw pumps are positive displacement pumps that can be constructed with multiple threads. These threads are connected to compress the liquid & transfer it into the system. The threads in the pump pick up the liquid and push it out of the other surface while increasing its pressure.

How the Screw Pump Works

The way the screw pump works is that when the screw pump pushes a thick liquid, then the thread can be firmly connected without permission, because the front is lubricated like the fluid in the pump. When the liquid is pumping, then these parts can not touch each other, also the elements wear out quickly. For this reason, three screw pumps should not be used for multi-phase or water service.

In three screw pumps, only a shaft seal is required during rotor drive. Additional rotors include bearings, which are enclosed in the pump chamber. In 2-thread pumps as opposed to 4-thread pumps, generally, the rotor protrudes across the pump housing into the gear housing wherever the timing gear is enclosed. For this reason, a 4-shaft seal is mandatory in screw pumps through two rotors.

Screw Pump Type

There are various types of screw pumps available in the market in various designs. They are discussed briefly below.

1. Single screw pump

This type of screw pump is called PC pump or progressive cavity pump, and Worm pump. In general, this type of pump is not included in the screw pump group. Because the rotor in this pump is not like an ordinary thread but rather a bent rotation shaft. Progressive cavity pumps include a single shaft slightly bent in the form of a thread, & enclosed in a pump chamber which is generally rubberised.

2. Two Threaded Screw Pump

This type of pump is generally called double screw pump, and it is the most commonly used type with high power applications such as heavy oil tube transfer. The threads on the pump are driven from the motor, & a timing gear is generally included to turn the next thread.

3. Three Threaded Screw Pump

This type of pump is also called triple screw pump. This type of pump is typically used in small applications such as lubrication systems. The threads in the pump are determined from the motor to rotate the remaining two threads around it without using the timing wheel.

4. Four Threaded Screw Pump

These screw pumps are basically two screw pumps, but with two threads for each rotor in opposite directions. This pump absorbs the liquid in the suction port, then splits evenly & diverted to both ends of the pump.

The two fluids flow with the help of a pump towards the center & connect together again before leaving the release port. Similar to a double screw pump, it includes a timing mechanism to keep the second rotor running. These pumps are often used in Multi-phase applications & oil transport pipelines.

5. Five Threaded Screw Pump

These pumps are mostly like three screw pumps; but with five threads instead of three. Similar to a 3-thread pump, this pump includes one submersible rotor that drives all remaining threads. This type of pump is often used in many applications such as tubular or hydraulic oil.

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