Working Principle of Sludge Screw Pumps
Working Principle of Sludge Screw Pumps
The sludge screw pump is a single-screw positive displacement pump. Its principle involves the rotation of an eccentric single-spiral screw within a double-spiral liner, which pushes thick slurry along the spiral groove from the suction inlet to the discharge outlet, thereby achieving the pump's conveying function. Below is a detailed introduction to the principle and performance of the sludge screw pump.
The slude screw pump uses the rotation of the screw to suction and discharge liquids. The central screw is the driving screw, rotated by the prime mover, while the screws on both sides are driven screws that rotate in the opposite direction to the driving screw. The threads of both the driving and driven screws are double-headed. Due to the mutual engagement of the screws and the tight fit between the screws and the liner wall, one or more sealed spaces are formed between the suction and discharge ports of the sludge screw pump. As the screws rotate and engage, these sealed spaces continuously form at the suction end of the pump, encapsulating the liquid from the suction chamber and axially conveying it along the screw to the discharge end. This process continuously discharges the liquid enclosed in each space, much like a nut being progressively pushed forward as the screw rotates. This is the fundamental working principle of the sludge screw pump.
Key Technical Features:
Employs modern CAD design methods for excellent hydraulic performance, high efficiency, and low wear rates.
Features spacious flow passages for superior anti-clogging performance and exceptional cavitation resistance.
Utilizes a combination of an auxiliary impeller, packing seal, and mechanical seal to ensure zero slurry leakage.
Incorporates reliability-focused engineering, significantly increasing the Mean Time Between Failures (MTBF).
Adopts metric bearings with oil lubrication and an optimized lubrication and cooling system for low-temperature bearing operation.
Wetted parts are made from special materials, offering outstanding wear and corrosion resistance.
Specially treated to handle seawater ash removal and environments with seawater and salt spray causing electrochemical corrosion.
Supports multi-stage series operation within allowable pressure limits, with a maximum working pressure of 3.6 MPa.
Performance Parameters:
Flow Rate: 0-150 m³/h
Head: 60-120 m
Power: 0.75-37 kW
Speed: 500-960 r/min
Inlet Diameter: 20-135 mm
Temperature Range: -15 to 200 °C
Applications:
The sludge screw pump is widely applicable in industries such as power, metallurgy, coal, building materials, and chemicals for conveying abrasive or corrosive slurries. It is particularly suited for handling ash and slag in power plants, concentrates and tailings in mineral processing plants, coal slurry in coal washing plants, and ore slurry in coastal and river mining operations. The maximum weight concentration it can handle is 45% for ash slurry and 60% for ore slurry.
This pump series is recognized for its rational structure, high efficiency, reliable operation, and ease of maintenance.
