The vertical long axis semi submersible axial flow turbine pump is a type of axial flow pump designed specifically for high flow, low head, and deep water level conditions. The impeller is completely submerged below the liquid surface and relies on the long axis to transmit power. Its core advantage is that it does not require pre injection of water and can deliver extremely high flow rates. The vertical long axis semi submersible axial flow turbine pump is the core equipment for large-scale water conservancy, municipal, and industrial high flow water supply scenarios.
🔧  Core structural characteristics
Fully submerged axial flow impeller: The impeller is equipped with 2-7 blades and rotates inside the circular tube pump casing. The liquid is transported in the axial direction, and the upper fixed guide vanes can eliminate the rotational motion of the liquid, efficiently converting kinetic energy into pressure energy.
Multi section customizable long shaft: The transmission shaft adopts a multi section flange splicing structure, with a conventional customized underwater depth of 1-10 meters. The ultra deep working condition can be extended to more than 30 meters. The concentricity error of the shaft system is strictly controlled within 0.05mm to avoid vibration and swinging during high-speed operation.
Double bearing lubrication system: The upper rolling bearings are lubricated with grease, while the lower liquid guide bearings can self lubricate through the conveying medium; When transporting sewage or granular media, it is possible to connect water with a pressure of 0.2 MPa or above for cooling and lubrication, which greatly extends the life of the bearings.
Leak free and shaft seal design: The pump body is completely submerged below the liquid level, eliminating traditional mechanical seals and completely eliminating the risk of medium leakage during operation. It is suitable for conveying flammable, explosive, and highly corrosive media.
Adjustable blade structure: The installation angle of large blade models can be manually or electrically adjusted, and they can operate in the high-efficiency range under different working conditions, greatly expanding the high-efficiency operating range.
📊  Typical performance parameters
parameter item
Industry wide scope
Rated flow rate of 600~34000 m ³/h, with extra large models reaching tens of thousands of m ³/h
The total lift is 0.8~26 meters, and the two-stage special design can be raised to 40 meters
Medium temperature ≤ 55 ℃, special materials can withstand high temperatures up to 90 ℃
Rated speed 245~1450 r/min
Operating efficiency ranges from 74% to 89%, with the high-efficiency zone covering 70% to 120% of the rated flow rate
Specific speed range of 500~1600, belonging to the category with the highest specific speed among power pumps
🏭  Main application scenarios
Water conservancy flood control and drainage: urban waterlogging control, large-scale drainage of farmland, irrigation of large irrigation areas. A single pump can transport tens of thousands of tons of water per hour and is the main equipment for pumping station drainage.
Industrial circulating water supply: The circulating cooling water system of thermal power plants, nuclear power plants, and large chemical plants directly draws water from rivers and reservoirs to provide stable high flow cooling water for heat exchange equipment.
Municipal water supply and drainage engineering: Large scale water plants can extract raw water, urban sewage treatment plants can increase flow rates, and are suitable for underground water collection tanks with larger burial depths.
Special engineering water intake: dock lifting and lowering water level regulation, canal lock replenishment, offshore platform seawater intake, using 316L stainless steel or titanium alloy material to resist seawater corrosion.
Emergency rescue drainage: Large flow emergency drainage in tunnel engineering, underground spaces, and underground mines, with fast response speed and can be immediately put into operation without the need for pumping.
✨  Core operational advantages
Zero risk start-up: The impeller is always completely submerged in water, without the need for water injection or vacuum pumping. It can be synchronously pressurized and supplied with water upon start-up, completely eliminating the risk of start-up failure caused by no water in the pump.
Extremely high conveying efficiency: Under high flow conditions, the operating efficiency can reach 89%, saving more than 20% energy compared to centrifugal pumps with the same flow rate. Long term operation can significantly reduce electricity costs.
Extremely small footprint: The vertical structure is directly installed at the top of the water tank, requiring only two support beams to support and fix it, without the need for additional pump room space. The infrastructure investment is reduced by more than 50% compared to horizontal axial flow pumps.
Stable operation and long service life: The radial runout of the shaft system is controlled within 0.13mm, with low operating noise and vibration. The overcurrent components are treated with wear-resistant coatings, and the service life is extended by 30% compared to ordinary axial flow pumps.
Strong adaptability to working conditions: By adjusting the installation angle of the blades, the flow rate and head can be adjusted over a large range, suitable for river water intake scenarios with large seasonal water level changes.
Attention: When the vertical long shaft semi submersible axial flow turbine pump reaches its maximum shaft power at zero flow, the valve on the discharge pipeline must be fully opened before starting to avoid motor overload and burnout.