Misunderstandings of Mechanical Seal Manufacturers

Mechanical seals are a kind of accessories that are used more frequently now, but in the process of using the product, it is easy to have some use errors to affect people's judgment, resulting in decreased use efficiency and damage. Therefore, for the convenience of everyone's understanding, the following The error of its use will be introduced.

1. The greater the spring compression, the better the sealing effect

In fact, the compression of the spring is too large, which can lead to rapid wear and tear of the friction pair and instant burning; excessive compression makes the spring lose its ability to adjust the end face of the moving ring, resulting in seal failure.

2. The tighter the dynamic ring seal, the better

In fact, too tight of the moving ring seal is harmful and unhelpful. One is to intensify the wear between the sealing ring and the shaft sleeve, resulting in premature leakage; the other is to increase the resistance of the moving ring to adjust and move in the axial direction, and it cannot be adjusted in time when the working conditions change frequently; the third is that the spring is too tired and easily damaged; It is to deform the moving ring sealing ring and affect the sealing effect.

3. The tighter the static ring seal, the better

The static ring seal is basically in a static state, and the sealing effect will be better if it is relatively tight, but it is also harmful if it is too tight. One is the excessive deformation of the static ring seal, which affects the sealing effect; the second is that the material of the static ring is mostly graphite, which is generally brittle, and excessive stress is easy to cause fragmentation; the third is that it is difficult to install and disassemble, and it is easy to damage the static ring.

4. The tighter the lock nut of the multi-stage centrifugal pump impeller, the better

Among the mechanical seal leakage, the leakage between the shaft sleeve and the shaft (inter-shaft leakage) is relatively common. It is generally believed that the leakage between the shafts means that the lock nut of the impeller is not locked. In fact, there are many factors that lead to the leakage between the shafts, such as the failure of the gasket between the shafts, the offset, the impurities in the shaft, and the large shape of the shaft and the shaft sleeve. Position errors, damage to the contact surface, gaps between the components on the shaft, and excessively long threads on the shaft head will lead to leakage between shafts. Excessive locking of the lock nut will only lead to premature failure of the inter-shaft pads. On the contrary, moderately lock the lock nut so that the inter-shaft pads always maintain good compression elasticity. During operation, the lock nut will automatically lock in a timely manner, so that the shafts are always in good condition. sealed state.

5. New is better than old

Relatively speaking, the effect of using the new mechanical seal for the water pump is better than that of the old one, but when the quality or material of the new mechanical seal is not selected properly, the large error in the matching size will affect the sealing effect; in polymeric and permeable media, if the static ring has no Excessive wear, it is better not to replace. Because the static ring is in a static state for a long time in the static ring seat, the polymer and impurities are deposited as a whole, which plays a better sealing effect.

6. Dismantling is better than no dismantling

Once the mechanical seal leaks, it is urgent to dismantle and repair. In fact, sometimes the seal is not damaged, and the leakage can be eliminated by adjusting the working conditions or properly adjusting the seal. This not only avoids waste, but also can verify its own fault determination ability, and accumulate maintenance experience to improve the quality of maintenance.