Today, let's explain the working principle of an axial flow pump for diving.

1. The QZ series submersible axial flow pumps are specifically designed for high flow rates and low lift applications. Submersible axial flow pumps typically operate with a lift of less than 10 meters. This product serves as a replacement for traditional axial flow pumps, featuring an integrated motor and pump unit that operates submerged in water, offering a series of advantages unmatched by conventional units.

2. In agriculture, for irrigation and drainage; in municipal applications, for stormwater and light sewage drainage; in industry, for water supply, cooling water, and raw water supply; and in hydraulic projects, for water regulation. Suitable for conveying clean water or light sewage. The pump nominal discharge diameter is available in sizes of 350, 500, 600, 700, 800, 900, 1000, 1200, 1400, 1600, and 1800mm.

3. Due to the integrated design of the motor and pump, there is no need for labor-intensive, time-consuming, and complex alignment procedures on-site. Installation is extremely convenient and quick, allowing for the elimination of a designated space for a backup pump. Instead, the backup pump can be stored in the warehouse, saving on investment in the pump station's intake pool. The submersible operation significantly simplifies the pump station and structural engineering, reducing installation area, and can cut the total cost of the pump station by 30-40%.

4. Pumps operate in water, with water flowing around the motor, resulting in low noise and excellent cooling conditions for the motor. They can be constructed as underground pump stations to maintain the natural landscape of the ground. The use of submersible electric pumps is a method to address the construction of pump stations and flood prevention issues in areas with significant fluctuations in water levels along rivers and lakes, eliminating the need for long shafts between the machines and pumps, thus enhancing operational safety and reliability.

5. The impeller is calculated based on the current hydraulic model, featuring excellent performance, stability, and maturity. The selection of a smaller nD value ensures good anti-cavitation performance and smooth operation. Two independent mechanical seals isolate the motor from the pump, with a vertical and sequential installation providing multiple safety measures and enhancing reliability. The oil chamber utilizes oil lubrication and cooling for the seals, acting as an isolation between the motor and the medium being transported. The retained volume within can mitigate the rise in pressure inside the oil chamber.

6. Upon the startup of the unit, the reactive torque of the motor's starting torque often causes the entire unit to rotate in the opposite direction. The anti-rotation device addresses this issue. The bearings utilize rolling bearings, capable of withstanding all axial and radial loads while being completely isolated from the medium pumped by the pump. The pump is coaxial with the motor, featuring a compact structure with minimized shaft extension, reducing deflection in design, resulting in minimal vibration during operation, and extended seal and bearing life.

High-performance squirrel-cage induction motors, specifically designed and manufactured for submersible pumps, meet the GB755 standard. The insulation grade is F, with operating temperatures up to 135°C. Depending on the power rating, voltages of 380V, 660V, 3KV, 6KV, and 10KV can be used. For high-voltage motors, a double VPI insulation process is employed to ensure reliable insulation. The motor housing directly transfers heat to the surrounding medium, which is then carried away by the water flow.

The submersible pump is equipped with multiple protection devices, allowing the leads to be connected to the electrical control box. These protection devices include overloading, phase failure, leakage, overtemperature, humidity, and water immersion protection, all installed in a form with a sealed intake water channel.