HLC Long Axial Multi-Stage Submerged Pumps Structural Features

The HLC vertical long shaft pump has an inlet that is vertically downward and an outlet that is horizontal. It is installed on a single foundation and features direct coupling between the pump and the motor. When viewed from above the motor end, the pump rotates counterclockwise. Its main features include:

1. Optimized with hydraulic design software, the product boasts superior performance and takes into account the anti-abrasion properties of the impeller and guide vanes, significantly extending the lifespan of wear-prone parts like the impeller. The product operates smoothly, is safe and reliable, and highly energy-efficient.

2. The pump's inlet is equipped with a filter screen, with appropriately sized openings. This effectively prevents large particles from entering the pump and damaging it, while also ensuring that the net water intake area is over 3.5 times the cross-sectional area of the discharge pipe, thereby minimizing inlet losses and enhancing pump efficiency.

3. The impeller is balanced with balancing holes to counteract axial force, and both the front and rear covers of the impeller are equipped with replaceable sealing rings to protect the impeller and pump body. The sealing rings feature a special weir-type structure, which effectively prevents the sedimentation of oxide scales or other impurities in the gap of the sealing ring after the pump shuts down, significantly enhancing the lifespan of the sealing rings and impeller.

4. Pump intermediate shaft, discharge pipe, and protective pipe are segmented. The intermediate shaft utilizes a sleeve-type coupling patent technology, achieving a radial coaxiality ten times better than other coupling methods, reducing the whole machine vibration by over 70%. The number of discharge pipes can be increased or decreased according to customer requirements, accommodating various submersible depths. The impeller and guide vane body can be multi-stage, meeting different lift requirements.

5. The pump's lifting pipe is connected by flanges, featuring a guide bearing in the middle. The pump guide bearing is made of reinforced filled polyethylene.PTFEOr Canadian Saer Bearing, Nitrile rubber can also be used (for medium temperatures above 55℃), with the shaft protected by a conduit. When transporting clean water, the conduit can be removed, and the guide bearing does not require cooling lubrication water. When transporting wastewater, the guide bearing must be externally connected to a cooling lubrication water supply. In areas where there is no clean water or the cost of clean water is high, a special structure can be added, using a pump to transport medium, which is filtered or sediment-separated before cooling and lubricating the guide bearing. The lubrication water system can be equipped with flow and pressure relays, etc., for control elements. If the water supply before startup is below the rated supply, the pump will not start. If, during operation, water or pressure is lost due to some reason (pipe blockage), the relay will send an alarm signal, the control room buzzer will sound, and the red light will alarm. At this time, the valve of the bypass system can be opened to supply water, ensuring sufficient water supply, and the fault can be repaired simultaneously. This control system can be remotely controlled.

6. The residual axial force of the pump and the weight of the rotor components are supported by the thrust bearing within the motor housing or by the motor equipped with a thrust bearing. The thrust bearing is lubricated with light oil and cooled externally with water. The thrust bearing can be fitted with a temperature control element.

7. The pump shaft seal is a packing seal, and replaceable shaft sleeves are installed at the shaft seal and guide bearing to protect the shaft. The axial position of the impeller can be adjusted conveniently either from the top of the bearing assembly or from the adjusting nut within the pump coupling.

8. Pumps can be equipped with control cabinets featuring automatic start/stop based on liquid level, overload alarms, and real-time remote monitoring. This enables centralized remote control for multiple pumps. Pumps with an inlet diameter greater than 500mm are equipped with an automatic venting system.

HLC Model Significance

Model Significance
　　300HLC2-50A
300—Pump outlet diameter φ300mm
HLC—Vertical Long-Shaft Pump
2 - Number of impeller stages: 2 stages (omitted when stage number is 1)

50 - Design head is 50m

A - Impeller Outer Diameter Cutting Code

HLC Vertical Long Axle Multi-Stage Submersible Pump Performance Parameters Table