The mechanical seal is one of the common wearing parts of water pumps, but if used or installed improperly, the mechanical seal will be more prone to wear and leakage, so we should pay attention to which aspects and which will affect the life of the mechanical seal, the following is Let’s summarize for your reference:

1. The axial force is too large:

The mechanical seal cannot withstand the axial force during use. If there is axial force, the impact on the mechanical seal will be serious. Sometimes the axial force is not balanced due to the improper design of the axial force balance mechanism of the pump, manufacturing, installation, and use. The mechanical seal bears an axial force, and the temperature of the sealing gland will be higher during operation. For polypropylene-based media, it will be melted at high temperatures, so the sealing effect will be lost soon after the pump is started, and the sealing end surface will appear when the pump is stationary. Intermittent blowout phenomenon.

2. The deflection of the pump shaft is too large:

Mechanical seal, also known as end face seal, is a contact type dynamic seal with a rotating axis. Under the action of fluid medium and elastic elements, two seal end faces perpendicular to the axis line closely fit and rotate relative to each other to achieve The sealing effect requires uniform force between the two seals. However, due to the unreasonable design of the pump product, when the pump shaft is running, the deflection generated at the installation of the mechanical seal is large, which makes the force between the sealing surfaces uneven, resulting in a poor sealing effect.

3. There is no auxiliary flushing system or the auxiliary flushing system setting is unreasonable:

The auxiliary flushing system of the mechanical seal is very important. It can effectively protect the sealing surface and play a role in cooling, lubricating, and flushing away debris. Sometimes the designer does not properly configure the auxiliary flushing system, and the sealing effect is not achieved; sometimes although the designer designs the auxiliary system, but 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 unreasonable. , The sealing effect is also not achieved.

4. Vibration is too large:

The vibration of the mechanical seal is too large, which will eventually lead to the loss of the sealing effect. However, the reason for the excessive vibration of the mechanical seal is often not the reason of the mechanical seal itself. Other parts of the pump are the source of vibration, such as the unreasonable design of the submersible sewage pump shaft, the reason for the processing, the insufficient precision of the bearing, and the parallelism of the coupling. Causes such as poor, large radial force.

5. Reasons for pump cavitation:

Due to unreasonable operation of the device system, poor cavitation performance at the pump inlet, and high speed of the pump, local cavitation occurs at the pump inlet. After cavitation occurs, there will be bubbles in the water, which will impact the mechanical sealing surface on the one hand. The outer surface causes the surface to be damaged; on the other hand, the flow film of the anastomotic surface of the dynamic and static ring will also contain air bubbles, which cannot form a stable flow film, resulting in dry friction of the anastomotic surface of the dynamic and static ring, and damage the mechanical seal device.

6. Insufficient machining precision:

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

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