Multi-stage centrifugal pumps are a special type of centrifugal pumps, consisting of two or more centrifugal pumps, each of which works independently but shares the same shaft. Multi-stage centrifugal pumps are usually used in high-pressure applications, such as water supply systems, pressurized systems, and high-pressure cleaning systems. The core operation of multi-stage centrifugal pumps is based on the principle of centrifugal pumps and has been exquisitely expanded in multiple stages. It consists of multiple impellers connected in series on the same shaft, and the motor drive shaft drives the impeller to rotate at high speed. When the first impeller rotates, like an ordinary centrifugal pump, a negative pressure is formed in the pump cavity, and water is sucked in and thrown to the periphery of the pump casing under the action of centrifugal force. After gaining a certain speed and pressure, it enters the next level of impellers. With each impeller, the energy of the water is further increased, so that the pressure is increased step by step, and finally the water is delivered to a place with higher pressure requirements. This multi-stage series structure, like a relay race, pushes water to a distance step by step, greatly improving the head.
There are many advantages of multi-stage centrifugal pumps:
1. High head and excellent performanceCompared with
Compared with single-stage centrifugal pumps, the biggest highlight of multi-stage centrifugal pumps is the ultra-high head. In some high-rise water supply, long-distance water delivery in mountainous areas, and high-pressure liquid delivery in petrochemicals, it can easily overcome huge resistance and deliver water or other liquids to a height of tens of meters or even hundreds of meters, meeting the strict requirements of industrial production and living facilities for high-pressure liquid transmission.
2. High operating efficiency
The design of multi-stage centrifugal pumps enables them to operate in a wider range of high-efficiency ranges. By reasonably matching the number of impellers and motor power, each stage of the impeller can fully play its role, reduce energy loss, and efficiently convert electrical energy into water energy. In the long run, it can save considerable energy consumption costs for enterprises and achieve a win-win situation of energy saving and high efficiency.
3. Flexible flow regulation
It can be matched with a variety of flow regulation methods, such as using variable frequency speed regulation technology, accurately changing the motor speed according to the actual water use or liquid delivery needs, and then flexibly adjusting the flow of the pump. Reduce the speed to save energy during the low water use period, increase the speed to meet the large flow supply during the peak period, adapt to the changing working conditions, and ensure the stable operation of the system.
