Screw Pump Production Guide

Screw Pump Production Guide

What Is A Screw Pump?

The screw pump is a type of dry compressed gas transfer pump. They are positive displacement pumps that transport fluid or water along a screw shaft using one or more screws. These screws interlock to pressurize and circulate the fluid through the system. These screws engage and reciprocate within the cylinder’s hollow. They are often employed in industrial vacuum applications, frequently in conjunction with Roots blowers, and as oil-free roughing pumps in high and ultra-high vacuum systems.

What Are The Parts Of A Screw Pump?

A screw pump is made up of many parts, including a casing, a screw (depending on the kind of screw pump, it can have one to five screws), bearings, a seal, a motor adapter, and a driving shaft. Screw pumps are built in a straightforward manner.

Screw pump parts

How Does A Screw Pump Work?

The screw pump, as the name indicates, has a screw thread-like shape and so the fluid passes down the screw thread from the suction side to the discharge side of the pump by turning it. The volumetric efficiency is high due to relatively close clearances inside the pump, especially with viscous fluids, since this lowers the amount of fluid slippage from the high pressure to the low pressure side. The pump, like any positive displacement pump, does not generate pressure; it merely transports fluid; it is the system as a whole that generates back pressure due to friction loss.

Type of Screw Pump

Screw pumps are a form of positive displacement pump that captures and transfers a variety of materials, including fluids, gas-liquid mixes, and solid-liquid mixtures, by employing screw-shaped rotors that intermesh and rotate together.

Screw pumps come in a variety of configurations suited to handle certain chemicals or purposes, such as:

Single Screw Pumps – The most popular, single screw pumps are also known as progressive cavity pumps. Their stator (screw) makes light contact with an elastomer stator, forming permanent chambers that transport a range of difficult-to-pump media.

Twin Screw Pumps – These pumps’ drive and driven shafts and screws are normally timed with timing gears. For handling various materials, a range of screw shapes are offered.

Triple screw pumps have a driving screw and two driven screws, but no timing gears. They are often employed in low-flow, high-pressure applications like lubricant oil systems.

Four Screw Pumps – These types have two opposing, twin screw pumps that use drive shafts and timing gears to operate their screws synchronously without interacting.

Five Screw Pumps – These pumps, which include a driving screw and four driven screws with timing gears, are widely used for high-viscosity fluids at greater flow rates and pressures.

Screw pumps are particularly successful in transferring high viscosity fluids and solid mixes, and they also allow pulsation-free, low-shear handling of a wide range of materials, making them helpful in a number of food and beverage processing activities.

Advantages of Screw Pump

  • These pumps are simple to keep in working order.
  • Progressive cavity pumps can handle any fluid.
  • These pumps deliver a steady, non-pulsating flow of fluid.
  • The pump has a higher volumetric efficiency.
  • Capability of self-priming
  • The progressive cavity pump does not pump fluid impurities.
  • You may also pump high viscosity fluids with a progressive cavity pump without losing flow.
  • Water vapor and particle/dust resistance is excellent.
  • Pumping speed is extremely fast, with no contamination of the pumped material.
  • Rotation is frictionless, which eliminates rotor wear.
  • Internal compression results in increased efficiency.
  • Operating and maintenance expenditures are quite minimal.
  • Inverter operation is simple to tune for process needs, resulting in good energy efficiency.

Disadvantages of Screw Pump

  • Installation fees are expensive for small businesses.
  • To transport light gases of high quality, the pump requires a gas ballast.
  • Without gas ballast, the final pressure and pumping speed of light gases (helium and hydrogen) cannot be scaled down to modest pumping rates of less than 50 m3/h; below about 100 m3/h multi-stage pumps are required. Root or scroll pumps are employed.

What Are The Applications And Uses Of Screw Pumps?

Screw pumps are typically employed on fluids with a greater viscosity; moving these fluids using screw pumps results in a more energy-efficient and compact machine when compared to other pump types, such as centrifugal pumps. Because the screws are not geared together and rely on the fluid to lubricate the screws, screw pumps with more than two screws are often utilized solely on lubricating fluids.

A twin screw pump has geared screws that keep the screws from touching each other and may thus be used on non-lubricating fluids, chemicals, and food-stuffs, among other things. Twin screw pumps have a higher flow rate than higher screw pump types, which have more than two screws.

  • A screw pump’s primary uses include oil-based fluids, tar bituminous, industrial adhesives, chemicals, and dairy products.
  • Screw pumps are more effective for pumping heavy oil. They can even pump larger flow rates and higher viscosity fluids.
  • These pumps can transport both liquids and gasses. As a result, these pumps are employed in a variety of pumping sectors.
  • Pumps are also utilized in the mining, oil and gas, and industrial industries.
  • Ceramic, chemical, paint, food, and paper industries all employ these pumps.

Screw Pump FAQs

Are screw pumps still used today?

This ancient structure is still employed in a variety of low-tech applications, including irrigation systems and agricultural machines for conveying grain and other materials.

What is the screw pump concept?

The screw pump is powered by two counter-rotating screw rotors that are deliberately engineered to revolve “towards each other.” This confines the gas between the “screws” of the rotor. This confined volume is lowered as the screws revolve, which not only compresses the gas but also propels it toward the exhaust port.

Why screw pumps are used instead of centrifugal pump?

Screw pumps often use less energy, i.e. a smaller motor, than centrifugal pumps for the same application due to their volumetric efficiency.

Are screw pumps efficient?

pump using a screwdriver High efficiency with changeable capacity.

A screw pump’s efficiency curve is flat on top. Because of this efficiency feature, the screw pump delivers even higher efficiency when operating at 50% of its capacity.

What is the main advantage of screw pump rather than external gear pump?

A screw pump’s operation is more gentler, with less pulsations, noise, and vibrations, resulting in a longer lifespan. Gear pumps are louder, more turbulent, and introduce more vibrations into the pump and piping, resulting in a shorter operating life.

summary

We are a solution provider specializing in generating screw pumps. If you have any questions, you can contact us

Scroll to Top

Let's get in touch