Mechanical seals will inevitably be damaged during daily use. In daily maintenance, mechanical seals often have the following misunderstandings. Below, the editor will give you a detailed introduction to common misunderstandings in mechanical seal maintenance.

1. The larger the spring compression, the better the sealing effect:

This is a misunderstanding that everyone is easy to fall into. In fact, it is not the case. Excessive spring compression can cause rapid wear of the friction pair and instant burn. Excessive compression will make the spring lose its ability to adjust the end face of the moving ring and cause the mechanical seal to fail;

2. The tighter the moving ring seal, the better:

Too tight the sealing ring of the moving ring is harmful and unhelpful. One is to aggravate the wear between the sealing ring and the shaft sleeve, and to leak prematurely; the other is to increase the resistance of the axial adjustment and movement of the moving ring, which cannot be carried out in a timely manner when the working conditions change frequently. Adjustment, thirdly, the spring is easily damaged due to excessive fatigue; fourthly, it deforms the moving ring seal ring and affects the effect of the mechanical seal;

3. The tighter the static ring seal, the better:

The static ring sealing ring is basically in a static state, and the sealing effect will be better if it is relatively tight, but too tight is also harmful: first, it causes excessive deformation of the static ring seal, which affects the sealing effect; second, the static ring is mostly made of graphite, which is generally brittle , Excessive force is very easy to cause breakage; third, it is difficult to install and disassemble, and it is easy to damage the static ring;

4. The tighter the impeller lock nut, the better:

In mechanical seal leakage, the leakage between the sleeve and the shaft (inter-shaft leakage) is relatively common. It is generally believed that the leakage between the shafts means that the impeller lock nut is not locked. In fact, there are many factors that cause leakage between the shafts, such as between the shafts. Pad failure, offset, impurities in the shaft, large form and position error at the matching part of the shaft and the sleeve, damage to the contact surface, gaps between the parts on the shaft, and excessively long threads on the shaft head will cause leakage between the shafts. Over-locking the lock nut will only cause premature failure of the inter-axis pad. On the contrary, properly lock the lock nut so that the inter-axis pad always maintains a certain compression elasticity. During operation, the lock nut will automatically lock in time to keep the shafts in good condition. The sealed state;

5. The new one is better than the old one:

Relatively speaking, the effect of using the new mechanical seal is better than the old one, but the quality or material of the new mechanical seal is improperly selected, and the large size error of the fit will affect the sealing effect. In the polymerizable and permeable media, the static ring is not excessive. Worn, it is better not to replace. Because the static ring stays in a static state for a long time in the static ring seat, the polymer and impurities are deposited as a whole, which has a better sealing effect;

6. It is better to dismantle and repair than not to dismantle:

Once the mechanical seal leaks, it is eager to dismantle and repair. In fact, sometimes the seal is not damaged. You only need to adjust the working conditions or properly adjust the seal to eliminate the leakage. This will not only avoid waste but also verify your fault judgment ability, accumulate maintenance experience and improve maintenance. quality.

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