Commonly used vertical multi-stage sectional centrifugal pump lift shaft

Lift shaft is refers to the vertical multi-stage sectional centrifugal pump before installing the coupling due to water pump with the momentum of the axial of rotor, which export center line and guide vane impeller imports the midline for not neat, carried through, adjust the axial displacement of the rotor parts, import to export the midline and guide vane impeller center line alignment of assembly process.

there are many factors that can affect water pump energy loss, for sectional multi-stage pump, the impeller outlet center line and guide vane inlet line alignment ( Alignment) Is one of the important factors. Tested, export the midline and guide vane impeller import midline deviation to the impeller outlet width of less than 5%, has had little impact on the performance of the water pump, the deviation of 10%, the pump flow rate decreased by 5% ~ 6%, energy consumption has risen sharply. So precise lift shaft, to minimize alignment deviation, to ensure efficient and reliable operation in the pump has a great significance.

in order to facilitate the description, now in the process of lift shaft, the following set of pump rotor state of several location:

1, the pump rotor parts under gravity in free static state, in the biggest channeling move down position ( See figure 1) And the initial state of lift shaft assembly.

2, rotor pump parts by the upward force, to achieve the biggest channeling move upward position ( See figure 2) 。

3, export center axis and guide vane water pump impeller axis coincidence, meet the design ideal, See figure 3)

 

       1. Line method

this is in the absence of other effective auxiliary assembly tool assembly at the scene of the lift shaft method to be used. Specific implementation plan: before assembly, vertical installation is in state 1 position of rotor, general with near the coupling gland as reference, make a mark on the axis line ( As shown in figure 1 A) Crow bar or lever to lift and using dynamic state until 2 of rotor position, similarly crossed to tag ( As shown in figure 2 C) 。 Take A and C the centerline of the marking line ( As shown in figure 3 B) 。 According to experience, general multistage pump at both ends of rotor design up momentum or were similar, same ideal assembly position is roughly in line B, impeller and guide blade alignment state at this time. The line B and the relative position of the referents unchanged, the coupling installation and debugging.

this method randomness, under the same conditions, for batch production of water pump, may cause the water pump performance has a certain difference.

 

       2. Standard module method

based on the size of the design pattern on the assembly parts, calculate the amount of lift shaft you need theory aligned H, making a standard module axial size of H ( As a general rule, be a ring) , radial size to fit the module put advisable, lift the rotor shaft to A line with the module at the top level ( See figure 4) , is the ideal assembly position, impeller and guide blade alignment. Keep line position, for coupling, after the completion of installation of the removed module. This method is simple, practical strong, but different types of pumps, amount of lift shaft H is not necessarily completely consistent, may need different specifications of the module, the module of the preservation and use easy to cause confusion. Due to reasons such as wear and tear, it is necessary to test module, maintenance on a regular basis.

 

       3. Calibration method

homemade a simple special tools, tool composed of magnetic block, connecting rod and the measuring scale as a whole. Magnetic block adsorbed on the relatively static parts such as bearing gland, according to calculate the amount of lift shaft you need theory H, lift the rotor shaft to delimit A spool displacement for H, displacement made reference to scale on the measuring scale ( See figure 5) 。 Keep line position, for coupling, after the completion of installation of the remove the special tool. This method with the help of measuring scale calibration, installation, according to the amount of lift shaft to implement digital simple and direct, avoids the multiple modules in method 2, applied more widely, but the brightness to the operating space and the environment have certain requirements.

 

       4. Spiral ranging method

for larger series and more weight of rotor pump, to lift the shaft was more difficult, but also for the amount of lift shaft is difficult to achieve the lift shaft. Aiming at the above problems, self-made auxiliary tool, use the principle of spiral rangefinder, on the one hand, utilizing the structural characteristics of screw transmission, reach the purpose of save Labour, fine-tuning, on the other hand, the tool radial surface with scale, to achieve precise control the amount of lift shaft. The assembly workshop practice, the method on improving work efficiency.

this is simple and practical method are produced in the working people wisdom of the brain, all roads lead to Rome, all the way to the quality of the products. In the context of today's energy conservation and emissions reduction, the source from the design and operation of active assembly as much as possible to improve the quality of the products, to reduce energy consumption of products use, which is of great significance to improve the corporate image, also as a force for environmental protection career.

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