What factors affect the sealing performance of the piston vacuum pump?

In the context of the continuous expansion of the pharmaceutical industry and the continuous progress of vacuum pump technology, the market prospect of piston vacuum pump is broad, and the competition among manufacturers is also becoming more and more fierce.

According to the industry, during the use of the piston vacuum pump, the sealing effect is a key factor affecting the operation, which requires users to pay great attention. So, how to ensure the sealing effect of the piston vacuum pump? It is understood that many users have the following major misunderstandings.

Misunderstanding 1, the greater the spring compression, the better the sealing effect of the vacuum pump. Relevant technicians said that it is not the case. The excessive compression of the spring can lead to rapid wear and tear of the friction pair and instant burning. In addition, excessive compression may cause the spring to lose its ability to adjust the end face of the moving ring, resulting in seal failure.

Misunderstanding 2, the tighter the dynamic ring seal, the better. The technician said that the sealing ring of the moving ring is too tight, which is harmful and unhelpful. If the sealing ring of the moving ring is too tight, it will aggravate the wear and leakage between the sealing ring and the shaft sleeve; the second is to increase the resistance of the axial adjustment and movement of the moving ring, and it cannot be adjusted in time when the working conditions change frequently; The fourth is to deform the sealing ring of the moving ring, which affects the sealing effect.

Misunderstanding 3, the tighter the static ring seal, the better. It is reported that 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 of the piston vacuum pump; the second is that the static ring is mostly made of graphite, which is generally brittle, and is easily broken by excessive force; ring.

Misunderstanding 4: The tighter the impeller lock nut, the better. It is understood that the leakage between the shaft sleeve and the shaft is relatively common in the seal leakage of the piston vacuum pump.

The technicians believe that there are actually many factors that cause the leakage between the shafts, such as the failure and offset of the gasket between the shafts, the impurities in the shaft, the large shape and position error at the joint between the shaft and the shaft sleeve, the damage of the contact surface, and the various parts on the shaft. There is a gap between the components, the thread of the shaft head is too long, etc., which will cause leakage between the shafts. Excessive locking of the lock nut will lead to premature failure of the inter-shaft pads. On the contrary, moderately lock the lock nut so that the inter-shaft pad will always maintain a certain compression elasticity. Good sealing condition.

Myth 5: The new is better than the old. Many users believe that old equipment is short-lived and new equipment is replaced. Relatively speaking, the effect of using the new mechanical seal for the piston vacuum pump is better than that of the old one, but when the quality or material of the new equipment seal is not selected properly, the larger error of matching size will affect the sealing effect.

The technicians said that in polymeric and permeable media, if the static ring is not excessively worn, it is better not to replace it. 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.

Misunderstanding 6, dismantling is better than no dismantling. It is reported that many users are eager to dismantle and repair the equipment once they find the leakage of the equipment seal. The technician said that, in fact, sometimes the seal is not damaged, and the leakage can be eliminated by adjusting the working conditions or properly adjusting the seal.

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