External Factors Affecting Mechanical Seal Effect

It is reported that mechanical seals are one of the mechanical basic components with more complex structures and can be widely used in many different industries. There are many factors that determine the sealing effect of equipment, such as model selection, machine accuracy, correct installation and use, etc. Today, the external factors that affect the sealing effect of seals are introduced:

1. The machining accuracy is not enough

There are many reasons for the insufficient machining accuracy. Some of them are the insufficient machining accuracy of the seal itself. The reasons for this are easy to attract people's attention and easy to find. But sometimes the machining accuracy of other parts of the pump is not enough, and this reason is not easy to attract people's attention. For example: the increase in accuracy of the pump shaft, shaft sleeve, pump body, and sealing cavity is not enough. The existence of these reasons is very detrimental to the sealing effect of the seal.

2. The vibration is too large

The vibration of the seal is too large, which eventually leads to the loss of the sealing effect. However, the reason for the large vibration of the seal is often not the cause of the seal itself. Other parts of the pump are the source of the vibration, such as unreasonable design of the pump shaft, processing reasons, insufficient bearing accuracy, poor parallelism of the coupling, Radial force and other reasons.

3. The axial channeling of the pump shaft is large

The sealing surface of the seal must have a certain specific pressure, so that the sealing effect can be achieved. This requires the spring of the seal to have a certain amount of compression, giving a thrust to the end face of the seal, and rotating the sealing surface to produce the required sealing. than pressure. In order to ensure this specific pressure, the seal requires that the pump shaft cannot have too much channeling, and cannot bear the axial force during use. If there is an axial force, the impact on the seal is serious. Sometimes due to the unreasonable design of the axial force balance mechanism of the pump and the reasons of manufacture, installation and use, the axial force is not balanced. The mechanical seal is subjected to an axial force, and the temperature of the sealing gland will be high during operation. For polypropylene media, it will be melted at high temperature, so the sealing effect will be lost soon after the pump is started, and the sealing end face will appear when the pump is stationary. Intermittent leaks.

4. There is no auxiliary flushing system or the setting of the auxiliary flushing system is unreasonable

The auxiliary flushing system of the seal is very important. The auxiliary flushing system of the seal can effectively protect the sealing surface, and play the role of cooling, lubricating, and washing away debris. Sometimes the designer does not configure the auxiliary flushing system reasonably, and the sealing effect cannot be achieved; sometimes although the designer designs the auxiliary system, due to impurities in the flushing fluid, the flow and pressure of the flushing fluid are not enough, and the location of the flushing port is unreasonably designed. , also can not achieve the sealing effect.

There are a total of four external factors that affect the effect of mechanical seals. Presumably, according to the introduction of these four items above, we can more clearly understand the use of the product and the reduction of failures, thereby effectively prolonging its service life.