Self-balancing multi-stage pump manufacturers regular drawings

Self-balancing multi-stage pump drawings Balanced shaft seal device, which replaces the multi-stage pump balance disc and shaft seal after it, both axial force balance, but also basically no leakage, so the balance of the device can fully recover the leakage loss . General multi-stage pump with the device, the total pump efficiency increased by about 3% to 6% (4% energy saving effect ~ 10%). The principle of this device is suitable for all multistage pumps (including deep submersible pumps). Currently in the head 300m following several pumps on trial, proved significant energy-saving effect. INTRODUCTION Self-balancing multi-stage pumps are normally operated with an axial force on the shaft that forces the rotor to move in the axial direction. Therefore, the axial force must be balanced or eliminated in order for the pump to work properly. There are many traditional balancing devices, such as balancing holes, balancing drums and balancing disks. These balance methods all play the role of balancing the axial force, but all have the disadvantages of large amount of leakage and complicated structure. Therefore, the balance of the axial force has always been a key issue of the pump. Although many scholars have conducted a large number of experimental studies, but its basic principles and structure can be said that no change. The new multi-stage pump balancing device proposed in this paper breaks the traditional structure of the pump balance device with new principle, new principle and new mechanism, which will have a far-reaching impact on the future development of pump technology. A new type of balancing device works New self-balancing multi-stage pump drawing balance device is a pair of static and dynamic friction mounted on the final impeller, the moving ring with the impeller rotation, stationary ring does not rotate. In front of the frictions of the end face is the high-pressure liquid at the exit of the last stage impeller. After the frictions of the face face, it communicates with the low pressure region of the air or pump inlet. The sealing face thus separates the high-pressure liquid from the low-pressure region. The total axial force directed towards the front of the impeller, acting on the inlet of the final stage impeller (equal to the pressure of the n ~ 1 stage pump) and below (ie equal to atmospheric pressure) behind the last stage impeller. Because the final impeller inlet pressure is high, the diameter of the friction end surface is less than the impeller inlet seal ring diameter, it is possible to balance the total axial force. Although sealed liquid pressure is relatively high, but can refer to the mechanical seal technology, try balanced structure, you can control the specific pressure, making the end of the friction pair like a floating bearing, so that frictional power loss is very small, and has a very long life.

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