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Troubleshooting methods for common parts of segmented multistage pumps

15 Apr 2021Email

Segmental multi-stage pump is a kind of water pump with more comprehensive functions, but in the process of using this kind of segmental multi-stage pump, some failures will often occur, such as some common failures of parts, know what causes and it The processing method will make the use process better.

 

Segmented multistage pump

1. Faults and solutions for the balancing device of segmented multistage centrifugal pumps

When the balance disc and the balance ring are worn too much (generally more than 2mm) or uneven, first flatten the worn grooves of the two, and add a gasket behind the balance ring to compensate for the reduced thickness. The added gasket must be even and flat, and should be replaced when it is worn too much.

 

2. Faults of impeller and mouth ring of segmented multi-stage pump and solutions

The blades of the water pump impeller are damaged due to cavitation or inhalation of solid impurities. If the orifice ring is too worn to be repaired, the impeller should be replaced; if there is only a little wear on the impeller orifice ring, repair can be performed. The method is to pierce the impeller with a mandrel on the lathe to flatten the groove of the impeller mouth ring, and then determine the inner diameter of the seal ring according to the size of the impeller mouth ring after turning. The gap between the impeller mouth ring and the seal ring is determined by the inner diameter of the seal ring, generally 0.3~0.5mm, and the outer diameter of the seal ring remains unchanged.

 

3. Faults of the shaft seal device of the segmented multi-stage pump and the solutions:

(1) The packing must be replaced when the water pump is overhauled, and the other parts must be cleaned and checked.

(2) When the shaft sleeve is ground out of the groove by the filler, it should be replaced or welded and repaired by turning.

(3) When installing the packing ring, the water seal hole must be aligned to avoid being blocked by the packing and making the water seal useless.

 

4. The shaft failure of the vertical segment multi-stage pump and the treatment method

The pump shaft is the core part of the rotor, which is equipped with an impeller and a shaft sleeve, and rotates at a high speed in the pump body.

As long as the pump shaft does not produce cracks and serious surface wear or bending, it can be repaired and used. The bending amount of the shaft should not exceed 0.06mm. When it is greater than this value, it should be straightened. It is best to straighten it with a screw press without heating.

 

5. The axial movement fault of the rotor of the segmented multistage pump and the treatment method

The neutrality of the inlet of the guide wing and the outlet of the impeller is very important and affects the performance of the pump. The inspection method is to check the rotor movement after the final assembly. The total movement of the 6-10 pump should be 1.0~2.0mm. If the axial movement is large, it is allowed to add a smooth surface and thickness between the balance plate and the balance ring. Even adjustment of the adjustment pad.

 

6. Faults of the bearing body of the segmented multi-stage pump and the solutions

Generally, the bearing body will not be damaged, but in case of improper fit or poor device to grind the shaft hole large, first boring the bearing hole with a boring machine (to ensure concentricity), then insert the sleeve, the outer diameter of the sleeve and the bearing The holes match, and the inner diameter matches the outer diameter of the bearing.

 

7. Severe vibration or noise

In the process of using stainless steel segment multi-stage pumps, various problems such as severe vibration or noise generation are likely to occur. In this case, if you want to repair this kind of failure, then you must We must first understand the reason for it. The reason for this situation is generally because the multi-stage pump is not installed firmly or is not installed in the correct position. On the other hand, if the multi-stage pump motor ball If the bearing is damaged, some noise may also occur. In the face of this failure, when repairing, you must use appropriate methods to further stabilize the pump. At the same time, you should also find a way to lower the installation height of the pump. It is caused by the damage of the motor ball bearing, so the motor ball bearing must be replaced in time at this time, so that the problem can be solved in time.

 

8. The drive shaft or motor bearing is overheated

This is also some of the faults that may often occur in the process of using multi-stage pumps. The reason for this situation is that there is a very important reason for the excessive consumption of lubricating oil in the process of using the multi-machine function. If the amount is too small, huge friction may be generated in this case, which may lead to overheating of the transmission shaft or motor bearing. On the other hand, if the bearing is broken, it may also cause this problem. Therefore, in the face of this kind of failure, When repairing a multi-stage pump, you must add some lubricating oil, or replace the bearing when the bearing is broken. If you continue to use the motor bearing or the drive shaft when the motor bearing is overheated, then it will be very difficult in this case. It may cause damage to various parts and accessories, which will have extremely serious consequences.

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