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How to use the fluoroplastic chemical pump mechanical seal correctly?

26 Apr 2021Email

Fluoroplastic chemical pumps are generally made of corrosion-resistant materials, such as glass fiber, pvc, fluoroplastics, and stainless steel. They are suitable for pumping corrosive liquids from bottles, barrels, cylinders, pools or other containers. It is widely used in chemical, petroleum, metallurgy, light industry, synthetic fiber, environmental protection, food, medicine and other sectors. Fluoroplastic chemical pump has the advantages of stable and reliable performance, good sealing performance, beautiful appearance, convenient use and maintenance, etc. Before the engineering plastic chemical pump works, the pump body and the feed pipe must be filled with liquid to form a vacuum state. When the impeller rotates quickly, the blades cause the liquid to rotate at a high speed. The liquid flies away from the impeller under the action of centrifugal force, and the water in the pump After being thrown out, the central part of the impeller forms a vacuum area. The liquid material is pressed into the feed pipe through the pipe network under the action of atmospheric pressure. In this way, the circulation is endless, and continuous conveying can be realized.

 

Correct use method of fluoroplastic chemical pump mechanical seal:

1. The greater the compression of the mechanical seal spring of the fluoroplastic chemical pump, the better the sealing effect. In fact, if the spring compression is too large, it can cause the friction pair to wear rapidly and instantaneously burn out; excessive compression makes the spring lose the ability to adjust the end face of the moving ring, resulting in seal failure.

2. The tighter the sealing diagram of the dynamic ring of the fluoroplastic chemical pump, the better. In fact, too tight a dynamic ring seal is harmful and useless. The first is to aggravate the wear between the seal ring and the shaft sleeve, and the premature leakage; the second is to increase the resistance of the axial adjustment and movement of the fluoroplastic chemical pump mechanical seal moving ring, which cannot be adjusted in time when the working conditions change frequently; the third is fluorine The mechanical seal spring of the plastic chemical pump is easily damaged due to excessive fatigue; the fourth is to deform the moving ring seal ring, which affects the sealing effect.

3. The tighter the static ring seal of the fluoroplastic chemical pump, 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 too tight is also harmful. One is that the static ring seal is excessively deformed, which affects the sealing effect; the second is that the static ring is mostly made of graphite, which is generally brittle, and excessive force is very 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 impeller lock nut of the fluoroplastic chemical pump, 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 of the fluoroplastic chemical pump means that the impeller lock nut is not locked. In fact, there are many factors that cause the leakage between the shafts, such as the failure of the shaft pads, offsets, impurities in the shafts, and the joints between the shafts and the shaft sleeves. Larger form and position errors, damage to the contact surface, gaps between parts on the shaft of the fluoroplastic chemical pump, and excessively long threads on the shaft head will cause leakage between the shafts. Over-locking of 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 be automatically locked in time, so that the shafts are always 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 mechanical seal will affect the sealing effect; fluoroplastic chemical pumps are used in polymerizing and permeable media. , If the static ring is not excessively worn, it is better not to replace it. 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, and the leakage can be eliminated by adjusting the working conditions or properly adjusting the seal. This can not only avoid waste but also verify one's own fault judgment ability, accumulate maintenance experience and improve the quality of maintenance.

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