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.

APPLICATIONS

The NMV industrial screw pump have a wide range of applications and are widely used in the following fields:

-Environmental Protection

• Industrial and Domestic Wastewater: Effective for conveying wastewater with solid particles and short fibers. Particularly suitable for applications involving oil-water separators and plate-and-frame filter presses.

-Shipbuilding Industry

• Bilge Cleaning: Efficiently pumps bilge water, oil-water mixtures, oil residues, and oily wastewater from ships.

-Oil Industry

• Crude Oil and Mixtures: Handles the transport of crude oil, oil-water mixtures, coal bed methane-water mixtures, and the injection of polymers into geological formations. This reduces the cost of mechanical oil extraction and enhances oil recovery rates.

-Pharmaceuticals and Personal Care

• Viscous Slurries and Emulsions: Suitable for transferring various viscous slurries, emulsions, and soft-paste cosmetics.

-Food Canning Industry

• Thick Liquids and Pastes: Conveys a range of thick starches, cooking oils, honey, syrups, fruit pulps, creams, minced fish, and by-products.

-Brewing Industry

• Fermentation and By-products: Handles thick fermentation slurries, concentrated lees, grain residues, various sauces, and slurries containing solid chunks.

-Construction Industry

• Mortar and Slurries: Effective for spraying and transporting cement mortars, lime slurries, paints, and other pasty materials.

-Mining Industry

• Slurry Transport: Pumps groundwater containing solid particles and sludge from underground mines to the surface.

-Chemical Industry

• Suspensions and Adhesives: Suitable for transporting various suspensions, oils, colloidal slurries, and adhesives.

-Printing and Papermaking Industry

• High Viscosity Inks and Slurries: Conveys high-viscosity inks, PVC polymers for wallpapers, and various concentrations of paper pulps and short-fiber slurries.

-Industrial Boilers and Power Plants

• Coal-Water Slurries: Effective for transporting coal-water slurries in industrial boilers and power plants.

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.