What are the reasons for the damage of the mechanical seal of the mixer

The mechanical seal plays an important role in the mixer, but the use of the equipment will inevitably cause damage. In this regard, in order to better ensure the use of the equipment, the following is the reason for the damage of the seal in the mixer. Introduced for better equipment resolution.

1. The installation of the static ring seat lacks precision

Under normal circumstances, there is no corresponding positioning member between the agitator static ring seat and the sealing chamber. The concentricity during the installation of the shaft sleeve and the time static ring is mainly determined by the experience of the staff, resulting in the installation efficiency being affected by human factors. direct impact.

Among them, the distance between the shaft sleeve and the static ring is relatively small, and the half-edge distance is 0.5 mm. Therefore, under the influence of factors such as the large swing of the agitator shaft and the error before the installation of the static ring seat, the friction phenomenon between the static ring and the shaft sleeve It often occurs and leads to its rupture, which further leads to the occurrence of damage to the mechanical seal of the agitator.

2. The stirring shaft swings and the stirrer vibrates

Under normal circumstances, the thickness of the melamine slurry tank wall of the agitator itself is relatively small, and its frontal rigidity cannot well meet the relevant requirements, resulting in a large vibration of the agitator during actual operation. The wear phenomenon is serious, and the matching distance between the shaft and the shaft sleeve is relatively large, which further causes a large swing of the stirring shaft during operation. The length of the cantilever of the stirring shaft is relatively large, and the deflection of the stirring shaft is relatively high. Although the relevant staff of the company have strengthened its design, the spacing between the shaft sleeve at the connection between the gearbox and the stirring shaft, as well as the increase and fixation, lead to the oscillation phenomenon of the stirring shaft during operation cannot be changed. During the continuous operation of the agitator, the wear phenomenon between the shaft sleeve and the shaft is gradually serious, which will lead to the continuous increase of the running swing of the agitator shaft. Under the influence of the vibration of the stirring shaft, the overall vibration frequency of the stirrer will gradually increase. On the contrary, the violent vibration of the stirrer will also promote the wear degree of the stirring shaft and the shaft sleeve of the reduction box, and cause its swing amplitude to be further increased. In this vicious circle, the seal damage of the agitator often occurs.

3. There are problems in the selection of friction materials

In the past, the friction pair materials used in mechanical seals were mainly emery and carbon graphite, which were mainly composed of soft and hard materials according to their physical properties. At the same time, the processing material is melamine slurry, which contains a large amount of granular melamine crystalline material, which is very easy to cause strong wear on the soft ring (that is, the moving ring), resulting in a decrease in the effect of the seal and the occurrence of leakage problems. .

The main reasons for the leakage of the mechanical seal in the mixer are the above-mentioned reasons. According to the above situation, we can understand the reasons for the damage of the equipment and formulate solutions to the equipment, so as to better ensure the use of the equipment and prolong the service life of the equipment.