Packing shaft seal: a simple and practical sealing method for slurry pumps

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• TIME : 2024-12-09

1、 The basic structure of packing shaft seal in slurry pump

The packing shaft seal consists of packing sleeve, packing ring, packing, packing cover, long buckle double head bolt and nut, etc.

2、 Working principle

Sealing implementation method: Sealing is achieved by tightly contacting the packing with the outer surface of the shaft. During normal operation, it is necessary to use a gland to press the packing tightly to prevent liquid leakage from the pump shaft, but it should not be pressed too tightly. If the pressure is too tight, the friction between the shaft and the packing will increase, and in severe cases, it will heat up, reducing the efficiency of the pump.

The function of shaft seal water: The packing seal requires injection of shaft seal water, and the pressure of the shaft seal water is required. The pressure of the general shaft seal water should be greater than the outlet pressure of the pump. Its function is to prevent the leakage of the pump slurry and prevent air from entering the pump chamber, which is particularly important for suction pumps.

3、 Applicable working pressure and packing type

Packing selection under different pressures

When the working pressure of the pump is below 0.5 MPa, butter boiled cotton thread roots or oil immersed asbestos roots can be used.

When the working pressure of the pump is above 0.5 MPa, PTFE packing or carbon fiber impregnated PTFE packing can be used.

4、 Advantages and disadvantages of packing shaft seals

advantage

Simple structure: Its components are relatively few, the structure is not complicated, and it is easy to understand and install.

Convenient maintenance: In case of problems, maintenance personnel can easily carry out maintenance operations without the need for special tools or complex techniques.

Cheap price: Compared with other sealing methods, the cost of packing sealing is lower, which makes it advantageous in some cost sensitive application scenarios.

shortcoming

Cannot transport specific media: When transporting corrosive materials, it may cause corrosion to the packing, so this sealing form is not suitable for transporting toxic and highly corrosive liquids.

It is necessary to control the pressure of the gland reasonably: as mentioned earlier, the pressure of the gland on the packing should be moderate, otherwise it will affect the efficiency of the pump, which requires certain operational experience and skills to grasp.

　　This article originates from https://www.fuyangpumps.com/news/280.html. Please indicate the source when reprinting.

(Editor in charge: Slurry Pump https://www.fuyangpumps.com/)

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