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What Are The External Factors Of The Mechanical Seal Sealing Effect?
May 02, 2018

What are the external factors of the mechanical seal sealing effect?

What are the effects of mechanical seals? Where does the mechanical seal come from? Is the mechanical seal widely used?

     1. One of the external factors that affect the effect of mechanical seals: insufficient machining accuracy

The machining accuracy is not enough because there are many reasons. Some of them are not enough precision in the machining of the mechanical seal itself. The reasons in this respect are easy to attract people's attention and are easy to find. But sometimes the processing accuracy of other parts of the pump is not enough. This is not easy to attract people's attention. For example: the pump shaft, bushing, pump body, seal chamber, and other reasons for the lack of accuracy. The presence of these causes is very detrimental to the sealing effect of mechanical seals.

2. External factors affecting the effect of mechanical seals Part 2: Large vibration

The vibration of the mechanical seal is too large and eventually leads to loss of sealing effect. However, the reason for mechanical seal vibration is often not the cause of the mechanical seal itself. The pump's other components are the source of vibration, such as the irrational design of the pump shaft, the processing reasons, the bearing accuracy is not enough, and the parallelism of the coupling is poor. , radial force and other reasons.

3. External factors affecting the effect of mechanical seals (3): Large axial displacement of the pump shaft

The sealing surface of the mechanical seal must have a certain pressure, so that it can play a sealing role, which requires a certain amount of compression of the mechanical seal spring, a thrust to the mechanical seal end surface, and the requirements for the seal surface to produce a seal when rotated The pressure ratio. In order to ensure this ratio of pressure, mechanical seals require the pump shaft can not have too much weight, mechanical seals in the process of use is not able to withstand the axial force, if there is an axial force, the impact on the mechanical seal is serious. Sometimes the axial force is not balanced due to the irrational design of the axial force balance mechanism and the manufacturing, installation, and use of the pump. The mechanical seal is subjected to an axial force, and the temperature of the seal gland will be high during operation. For polypropylene-based media, it will be melted at high temperatures. Therefore, the seal effect will be lost soon after the pump is started, and the seal face will be sealed when the pump is at rest. Intermittent blowout.

4. External factors affecting the effect of mechanical seals: No. 4: Unreasonable setting of auxiliary flushing system or auxiliary flushing system

The auxiliary flushing system for mechanical seals is very important. The mechanical seal auxiliary flushing system can effectively protect the sealing surface, and can play the role of cooling, lubrication, and washing away debris. Sometimes the designer does not properly configure the auxiliary flushing system to achieve the sealing effect; sometimes, although the designer has designed the auxiliary system, due to impurities in the flushing fluid, the flow rate and pressure of the flushing fluid are not enough, and the position of the flushing port is not designed properly. , also can not reach the sealing effect.

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