Chinese Red Milano Tile,Black Red Milano Tile,Gray Milano Tile Shandong Yahong New Materials Technology Co., Ltd , https://www.okrooftile.com
The multi-stage pump housing is constructed from stainless steel, ensuring durability and resistance to corrosion. Multiple impellers are mounted on a single pump shaft and operate in series, progressively increasing the energy of the fluid through centrifugal force. As the liquid passes through each impeller sequentially, it gains pressure, ultimately achieving the highest head. The pump consists of four main components: the stator, rotor, bearings, and shaft seal. During operation, vibrations typically result from loose bolts or an unbalanced rotor. To resolve this, bolts should be tightened, and the bearings should be straightened.
When assembling the multi-stage pump, it's essential to apply a layer of lead powder oil to the bolts and nuts for smoother assembly. After installing the final impeller, measure the axial distance between the hub and the balance disc end face, then determine the sleeve's axial dimension based on that measurement. This ensures proper clearance between the retaining sleeve and the impeller hub, as well as the balance disc hub. Since the pump operates at high temperatures, the impeller and shaft may expand at different rates. An axial clearance of 0.3–0.5 mm is reserved to prevent excessive tensile stress caused by thermal expansion.
When installing the balance plate retainer ring, align one of the upper notches with the interface of the balance water pipe. Failure to do so can block the pipe and disable the entire axial balancing system. Long rod bolts should be initially tightened during assembly, but after the complete pump is installed on-site, they should be tightened according to recorded data. It’s important to tighten them symmetrically to avoid poor sealing between the sections.
The multi-stage pump is mainly composed of four parts: the stator, rotor, bearing, and shaft seal.
1. **Stator**: Includes the suction section, middle section, discharge section, and guide vanes. Tension bolts hold these sections together, forming the working chamber. Most multi-stage pumps are horizontally suctioned and vertically discharged. For oil field water injection, the inlet and outlet are often vertical.
2. **Rotor**: Composed of the shaft, impeller, balance disc, and bushing. The balance disc helps manage axial forces.
3. **Bearings**: Made up of the bearing housing, bearing, and gland. They are lubricated with grease or oil.
4. **Shaft Seal**: Uses soft packing, including a sealing body, packing, and water ring. The water seal is usually derived from the pressurized fluid inside the pump, while DG-type pumps use external water supply.
The multi-stage pump is driven directly by a prime mover via an elastic coupling. From the motor side, the pump rotates clockwise, making it suitable for horizontal, single-suction applications. It is ideal for pumping clean water or liquids similar to water, with a medium temperature below 80°C. It is commonly used in mine drainage, oilfield water injection, and municipal water supply and drainage systems. Oilfield pumps are made from materials suited to the corrosive nature of the medium. Some models can handle media up to 105°C, making them suitable for boiler feed water applications.
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