Problems with the pump body bottom sleeve
Thread Content
When the gap between the bottom sleeve and the shaft sleeve of a single-stage centrifugal pump decreases – for example, if the original gap was 0.7 millimeters and it is now reduced to 0.2 millimeters as a result of modifications – will the pressure in this sealing chamber change? Will it extend the service life of the seal? What are the benefits for the operation of sealing if spiral grooves are turned on the inner wall of the bottom sleeve?
Reducing the gap between the bottom sleeve of the single-stage centrifugal pump casing and the shaft sleeve from 0.7 millimeters to 0.2 millimeters helps to decrease the leakage rate; this reduction in the sealing gap may lead to an increase in pressure within the sealing chamber, as the pathways for fluid leakage become narrower. This change can theoretically improve the sealing effect, thereby extending the service life of the seal. Turning spiral grooves on the inner wall of the bottom sleeve can help guide the fluid to flow along a specific path, which facilitates the formation of a liquid film, reduces friction and wear, thereby improving the sealing performance and enhancing the cooling effect of the sleeve. This design can also help stabilize the sealing environment, thereby further optimizing the operating condition of the seal. .
The question is too vague; it’s necessary to consider under what operating conditions the pump is used, what medium it handles. Factors such as particle size in the medium and temperature should also be taken into account, and the clearance cannot be reduced arbitrarily
Well, that’s right; high-temperature pumps certainly require larger clearances. However, pump manufacturers usually provide a margin of safety when delivering these pumps, with some having clearances as large as 5–10 millimeters. Low-temperature pumps generally don’t require such considerations, but when there are frequent seal leaks, solutions can be found by looking at this aspect