Difference between a helical gear pump and a screw pump

A helical gear pump and a screw pump are fundamentally similar. Nevertheless, there exists some important differentiation here. This article will enlighten you on the distinction between a helical gear pump and a screw pump hence helping you in choosing the best one for your needs.

Helical gear pumps have a lower RPM than screw pumps

This makes them perfect for situations where the pump needs to run continually such as water purification and filtration. In reality, helical gears can circulate power at high pressures with no damage to the pump because of their low RPMs. In fact, this is a big advantage of screw pumps which can only get power delivered at lower pressure.

After all, helical gear pumps have multiple gears one above another so that each gear exerts a force on the next through rolling bearings. This design enables very high speed rotations of these gears while at the same time reducing friction between them. They are able to turn at very fast speeds resulting in little drag thereby making it possible for them to rotate smoothly and silently hence increasing efficiency by the amount of work done per revolution made by the shaft of a pump (RPM).

Helical gear pumps have higher volumetric efficiencies than screw pumps

Helical gear pumps are preferred for their high volumetric efficiency and are used in a wide range of applications. For highly viscous liquid, the helical-gear pump is efficient and dependable; it consumes low power, wears little and need not be lubricated.

Helical gear pumps come in both positive displacement and displacement types. The positive displacement type is more common because it occupies less space due to its smaller diameter.

Increasing the pressure increases the torque required to rotate the shaft of a helical gear pump. It suggests that helical gear pump can run at higher pressures than screw pumps without needing specific protection measures such as coolers or fans.

Helical gear pumps require more power input than screw gear pumps

In the oil industry, water treatment and wastewater treatment industries, helical gear pumps are used. These also find use in other sectors like textile industry, food processing as well as pharmaceutical and chemical industries.

Helical gear pumps have higher volumetric efficiencies than screw pumps. In comparison with common screw pumps, they can deliver more volume per revolution. This is because for instance the helix of the pump builds up pressure over time rather than all at once which would be disadvantageous compared to a conventional screw pump.

Helical gear pumps have higher operating temperatures than screw gear pumps

Temperature range for helical gear pumps is between -20°F to +130°F (-29°C to 55°C) and when temperature of the helical gear pump increases, also speed of the shaft increases. Speed of rotation of the shaft thus depends on how high its temperature end up.

Helical gear pumps are used in cooling water or oil system components that require low-speed operation. They cannot be used in high-pressure systems with large-volume liquid flows or medium-pressure applications requiring high operating temperatures.

The helical gear pump is more susceptible to corrosion than the screw gear pump

As regards corrosion resistance, the helix has a smaller diameter in comparison to that of the screw gear pump.

However, even if there is some water or dirt inside the tube, it can still cause damages to the pump since they result in friction which will wear out the teeth/bearings of gears within.

Compared to helical gears, the screw gear pump has an outer cover which protects its internal parts from rusting and corroding. Nevertheless, this covering is less efficient than one found on helical gears because it allows more dirt and water into its inner parts.

Helical gear pumps have minimal pulsation, while screw gear pumps produce high pressure pulsations at low speeds

A number of helical spur gears mesh with the driven output shaft and are arranged on a cylindrical or conical gear set. The input shaft drives them since they are set up on a cantilevered shaft, which is allowed to rotate in bearings.

It separates liquid from solids, compress air and raise water levels in well fields and drill holes for oil wells using the rotation of two or more rotating disks or bars. There are low-speed as well as high-speed models that operate through drive impeller shafts by either helical spiral gearing mechanisms.

Helical gear pumps are much more robust than screw pumps

More long-lasting and less prone to breaking down is how the helical gear pump is made. It does this by using gears in place of screws or other fasteners. In this way, it can be used in heavy duty applications without failure.

On the other hand, a higher flow rate is possible with the helical gear pump as compared to screw-based types. This feature proves useful especially when pumping up oils or water under high pressure situations that would require speedy operations.

Moreover; you can easily tailor-make the helical gear pump to suit your working conditions’ space limitations. Therefore, you may have your liquids/gases pumped into anywhere quickly at small or big spaces comfortably.