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Reconstruction Of Sewage Pump Seal
Nov 02, 2017

Sewage treatment project is an important project of environmental protection, and sewage pump as a major auxiliary equipment for sewage treatment works are widely used in urban sewage, mining, metallurgy, electricity and petrochemical and other sewage treatment operations, development prospects. Sewage pump products in addition to the requirements of good technical performance, the seal is the key to sewage pumps, must be high reliability, sewage pump running for a long time without failure. Sewage pump in the work, the seal once the failure, the external media or oil in the oil chamber will enter the motor chamber, causing the diving motor phase, short circuit, leakage, burn the motor, and even affect personal safety. Therefore, in order to further improve the safety of the use of sewage pumps, operational reliability and improve the operating time of the sewage pump trouble-free, it is necessary for the sewage pump is usually used mechanical seal structural analysis, implementation improvements.

Sewage treatment project is an important project of environmental protection, and sewage pump as a major auxiliary equipment for sewage treatment works are widely used in urban sewage, mining, metallurgy, electricity and petrochemical and other sewage treatment operations, development prospects. Sewage pump products in addition to the requirements of good technical performance, the seal is the key to sewage pumps, must be high reliability, sewage pump running for a long time without failure. Sewage pump in the work, the seal once the failure, the external media or oil in the oil chamber will enter the motor chamber, causing the diving motor phase, short circuit, leakage, burn the motor, and even affect personal safety. Therefore, in order to further improve the safety of the use of sewage pumps, operational reliability and improve the operating time of the sewage pump trouble-free, it is necessary for the sewage pump is usually used mechanical seal structural analysis, implementation improvements.

First, the commonly used form of sealing and inadequate

At present, the sewage pump products commonly used in the form of two seals: packing seal and mechanical seal. The packing seal, shown in Figure 1, is one of the oldest sealed structures that originated from the traditional seal before the Industrial Revolution, with a 100-year material process, a lubricant system and a manufacturing method, and maintained a continuous improvement Application. It has been analyzed that the soft packing structure has the following drawbacks:

1.jpg

1. Sealing media contains impurities that seriously affect the sealing performance. Impurities into the soft packing seal inside, further increasing the filler seal and the friction between the sleeve and wear. Although the material wear resistance is better, but the effect is still poor, frequent leakage. In addition, because there is no use of liquid seal on the packing seal lubrication, but also exacerbated the wear between the filler and the sleeve.

2. The working state is unstable and need to adjust and replace the packing frequently. Due to the viscoelastic properties of the soft filler itself, there will be significant stress relaxation in the working condition. In order to maintain its normal sealing function, it is necessary to continuously increase the radial contact force between the packing and the shaft by pressing the gland, and also to increase the wear of the soft filler and the shaft. Therefore, it is necessary to replace (or add) the filler , Maintenance workload and cost greatly increased.

3. Wearing serious energy consumption. According to the working mechanism of the soft packing seal, the packing seal and the shaft (or sleeve) must maintain a large radial contact pressure to maintain the seal, so the packing and shaft (or sleeve) friction, wear is very serious Sealing soon lost the ability to work at the same time, resulting in considerable waste of energy consumption.

Mechanical seal with a small loss of friction power, long life, no leakage and many other advantages, has been widely used in the pump. To seal the structure of the pump structure into a mechanical seal structure from the design, structure and processing to consider several aspects.