Multistage centrifugal pump structure description
The stator section of a multistage centrifugal pump typically consists of the suction section, middle section, discharge section, and guide vanes. These components are clamped together using tension bolts to create the working chamber. A multistage centrifugal pump is generally made up of four main parts: the stator, rotor, bearings, and shaft seal.
1. The stator part includes the suction, middle, and discharge sections, along with guide vanes. Tension bolts hold these sections in place to form the pump’s internal chamber. D-type pumps usually have a horizontal suction and vertical discharge, while DG-type pumps typically have vertical inlet and outlet. When used for oilfield water injection, the inlet and outlet of D-type pumps are often directed vertically upwards.
2. The bearing system comprises the bearing housing, bearings, and bearing gland. Lubrication can be achieved through grease or thin oil, depending on the application and operating conditions.
3. The rotor assembly includes the shaft, impellers, balance disc, and bushing. The balance disc helps to counteract the axial forces generated during operation, ensuring smooth and stable performance.
4. The shaft seal is commonly made of soft packing and consists of a sealing body, packing material, and a water-retaining ring. For D-type pumps, the sealing water comes from the pressure inside the pump, while DG-type pumps use external water supply for this purpose.
5. The pump is driven directly by a prime mover via an elastic coupling. From the motor side, the pump rotates clockwise. The DL-type pump is a horizontal, single-suction, multistage centrifugal pump designed for clean water or liquids with similar properties, such as those containing less than 1% impurities and particles smaller than 0.1 mm. D-type pumps operate at temperatures below 80°C and are suitable for applications like mine drainage, oilfield water injection, and municipal water supply. DG-type pumps handle media at temperatures below 105°C and are commonly used for boiler feedwater.
What distinguishes a multistage centrifugal pump from a single-stage one?
1. A single-stage pump has only one impeller and typically achieves a maximum head of around 125 meters.
2. A multistage pump, on the other hand, uses two or more impellers, allowing it to generate a much higher head—often exceeding 125 meters. If a higher head is required, multiple stages can be added instead of using multi-motor configurations. Multistage pumps are often used to extend pump life and reduce noise levels. However, they tend to be more complex to repair compared to single-stage models.
3. When the required head is below 125 meters, the choice between a single-stage and multistage pump depends on factors such as space availability, cost (multistage pumps are generally more expensive), and overall efficiency.
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Source: China Hardware Business Network – [http://news.chinawj.com.cn](http://news.chinawj.com.cn)
Editor: Hardware Business Network Information Center
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