Progressive Cavity Pump

Overview

The NM series horizontal industrial screw pump 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.

Application

• Environmental Protection: Used for transporting industrial and domestic wastewater, sludge, and muddy water containing solid particles and short fibers. Particularly suited for oil-water separators and plate-and-frame filter presses.
• Marine Industry: Transports bottom sludge, oil-water mixtures, oil residues, and oil-contaminated water.
• Petroleum Industry: Moves crude oil, mixtures of crude oil and water, coal bed methane and water mixtures, and injects polymers into formations to reduce mechanical oil recovery and coal bed methane costs, increasing oil recovery rates.
• Pharmaceutical and Daily Chemicals: Handles various viscous slurries, emulsions, and ointments.
• Food Canning Industry: Transports viscous starches, cooking oils, honey, syrups, fruit pulps, creams, and meat pastes, as well as their by-products.
• Brewing Industry: Moves fermentation slurries, high-concentration brewers’ grains, cereal by-products, sauces, and slurries containing solid particles.
• Construction Industry: Pumps cement mortar, lime slurry, coatings, and other pastes for spraying and transport.
• Mining Industry: Delivers underground water and sludge containing solid particles from mines to the surface.
• Chemical Industry: Handles various suspensions, oils, colloidal slurries, and adhesives.
• Printing and Paper Industry: Transports high-viscosity inks, PVC polymer for wallpapers, and various concentrations of paper pulp and short-fiber slurries.
• Industrial Boilers and Power Plants: Moves coal-water slurries.

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.