NMV industrial screw pump with variable frequency motor

Overview – NMV screw pump with VFD motor

The NMV industrial screw pump with variable frequency motor（VFD）operates on the principle of rotary positive displacement. The main working components are the eccentric screw (rotor) and the stationary liner (stator). Due to the unique geometry of these two components, separate sealing chambers are formed, allowing the medium to flow axially and uniformly. This design results in low internal flow velocity, minimal noise, constant volume, and stable pressure. Consequently, there are no vortices or turbulence, and the medium’s inherent structure remains intact.

The stator is made from various elastic materials, which allows the screw pump to handle high-viscosity fluids and media containing hard suspended particles or fibers more effectively than conventional pumps.

Advantages

• • Uniform Liquid Discharge, Stable Pressure: Unlike centrifugal pumps, screw pumps do not require valve installations, resulting in more stable flow rates and pulsation-free pressure.
  • Stronger Self-Priming Capability: Compared to piston pumps, single screw pumps offer superior self-priming ability, allowing them to handle various conditions with greater efficiency.
  • Multi-phase Medium Transport: Single screw pumps can handle a range of mixed media including liquids, gases, and solids, unlike diaphragm pumps. They can transport mediums containing gases and solid particles or fibers, and are also capable of handling corrosive substances.
  • High Viscosity Transport: Unlike gear pumps, screw pumps can handle higher viscosity mediums, making them suitable for transporting very thick fluids.
  • Chemical Dosing and Metering: Single screw pumps are used for chemical dosing and metering, providing a different capability compared to piston pumps, diaphragm pumps, and gear pumps.
  • Innovative Structural Design: The pump’s pitch is shortened, reducing its overall volume. The optimized universal joint design effectively reduces mechanical vibrations, extending the pump’s operational life.
  • Strong Medium Adaptability: Screw pumps are versatile, capable of handling lubricating or non-lubricating media, corrosive substances, mediums with small solid particles, and a wide range of viscosities from low to extremely high.