Mistaken area of ​​mechanical seal repair of centrifugal stainless steel chemical pump

Mistaken area of ​​mechanical seal repair of centrifugal stainless steel chemical pump

1. The greater the amount of spring compression, the better the sealing effect is not necessarily the better

Some people mistakenly believe that the greater the amount of spring compression, the better the sealing effect. In fact, if the spring compression amount is too large, the friction pair may be sharply worn and burned instantaneously; excessive compression causes the spring to lose the ability to adjust the end face of the moving ring, resulting in seal failure.

2. The repair is better than not

In the event of a mechanical seal leak, it is urgent to dismantle. In fact, sometimes the mechanical seal is not damaged. It is only necessary to adjust the working condition or properly adjust the seal to eliminate the leak. This avoids waste.

3. The moving ring seal is not as tight as possible.

In fact, the dynamic ring seal is too tight and harmful, firstly, the wear between the seal ring and the bushing is intensified, and the leakage is premature; secondly, the resistance of the axial adjustment and movement of the moving ring is increased, and it is impossible to carry out timely when the working conditions change frequently. Adjustment; the third is that the spring is excessively fatigued and easy to damage; the fourth is to deform the moving ring seal ring and affect the sealing effect.

4. Static ring seal is not as tight as possible

The static ring seal is basically at rest, and the seal will be better when it is relatively tight, but too tight is also harmful. First, it causes excessive deformation of the static ring seal and affects the sealing effect. Secondly, the static ring material is mostly graphite, which is generally brittle. Excessive force is easy to cause fragmentation. Third, it is difficult to install and disassemble, and it is easy to damage the static ring.

5. The impeller lock is not as tight as possible.

In mechanical seal leaks, leakage between the bushing and the shaft (interaxial leakage) is more common. It is generally believed that the leakage between the shafts is that the impeller locks are not locked. In fact, there are many factors causing leakage between the shafts, such as the failure of the washer between the shafts, the offset, the impurities in the end faces between the shafts, and the large fit between the shaft and the sleeve. Shape and position errors, contact surface damage, gaps between components on the shaft, and excessive length of the shaft threads can cause leakage between the shafts.

Keeping in mind the above misunderstandings, you can take less detours when dealing with centrifugal stainless steel chemical pump failures, which is more convenient.