Вертикальный длинновальный многоступенчатый погружной насос HLC

Structural Features of HLC Long-shaft Multistage Submerged Pump
The HLC vertical long-shaft pump features a vertically downward inlet and horizontal outlet with single-base installation and direct coupling between the pump and motor. Viewed from the top of the motor end, the pump rotates counterclockwise. Its main structural features are as follows:
Optimized design is adopted via hydraulic design software with superior performance. The abrasion and corrosion resistance of impellers and guide vanes are fully considered, greatly extending the service life of vulnerable parts such as impellers. The pump operates stably, safely, reliably, efficiently and energy-saving.
A filter screen is installed at the pump inlet with appropriately sized openings. It effectively prevents large particle impurities from entering and damaging the pump, while ensuring the net inlet area is more than 3.5 times the cross-sectional area of the lift pipe. This reduces inlet flow loss and improves pump efficiency.
Balance holes are adopted on the impeller to balance axial thrust. Replaceable wear rings are fitted on both front and rear shrouds of the impeller to protect the impeller and pump casing. The wear ring adopts a special weir-type structure, which effectively prevents scale, iron oxide scale and other impurities from settling into the gap inlet of the wear ring after pump shutdown, significantly prolonging the service life of wear rings and impellers.
The pump intermediate shaft, lift pipe and protective pipe are segmented into multiple sections. The intermediate connecting shaft adopts sleeve coupling technology, improving radial concentricity by ten times compared with other coupling methods and reducing overall unit vibration by more than 70%. The number of lift pipes can be increased or decreased according to user requirements to adapt to different submerged depths. Multi-stage impellers and guide vane assemblies are available to meet different head requirements.
The pump lift pipes are connected by flanges, with guide bearings arranged in the middle section. The guide bearings are made of reinforced filled PTFE or Canadian Xylon bearings; nitrile rubber is also optional for medium temperatures above 55℃. The shaft is protected by a protective pipe. When conveying clean water, the protective pipe can be omitted and no cooling/lubricating water is required for guide bearings. When conveying sewage, external cooling and lubricating water must be supplied to the guide bearings.For sites without available clean water or with high clean water costs, a special structure can be added. The medium pumped by the unit can be filtered or sedimentated and separated to supply cooling and lubrication for guide bearings.The lubrication water system can be equipped with control components such as flow and pressure relays. The pump cannot start if the water supply flow is lower than the rated flow before startup. If water shortage or pressure loss occurs due to pipeline blockage or other faults during operation, the relay will send an alarm signal, triggering buzzer sound and red light alarm in the control room. At this time, the bypass valve can be opened to ensure sufficient water supply while troubleshooting. This control system supports remote control operation.
The residual axial thrust and the weight of the rotor assembly are borne by the thrust bearing inside the motor base or by a motor equipped with an integral thrust bearing. The thrust bearing adopts thin oil lubrication with external water cooling. Temperature sensing elements can be embedded in the thrust bearing for temperature monitoring.
The pump adopts stuffing box shaft sealing. Replaceable shaft sleeves are installed at the shaft seal and guide bearing positions to protect the main shaft. The axial position of the impeller can be easily adjusted via the adjusting nut at the upper end of the bearing assembly or inside the pump coupling.
The pump can be equipped with a control cabinet, which integrates functions such as automatic start-stop according to liquid level, overload alarm and real-time remote monitoring, supporting networked centralized remote control of multiple pumps. Pumps with a caliber larger than 500 mm are equipped with an automatic exhaust system.