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Mechanical seal failure treatment and analysis
As a key component to prevent fluid leakage in rotating equipment, the performance and stability of mechanical seal directly affect the operating efficiency and safety of equipment. However, in practical applications, mechanical seals may encounter various failures, such as leakage, vibration, heating and so on. This article will introduce the common failures of mechanical seals and their treatment and analysis methods to help readers better understand and solve these problems.
First, the common failure of mechanical seal
- Leakage
Leakage is one of the most common faults of mechanical seals, mainly manifested as medium leakage between sealing surfaces. Causes of leakage may include:
Sealing surface damage: such as wear, heat cracking, deformation, damage, etc., especially the non-metal sealing end face is more vulnerable to damage.
Improper assembly: if the sealing end face is damaged or deformed during installation, or the sealing surface is not fully fitted.
Spring failure: spring relaxation, fracture or insufficient compression, resulting in the sealing surface can not be tightly fitted.
Auxiliary sealing ring failure: such as sealing ring deformation, hardening, cracking or improper assembly.
- Vibration and heat
If there is vibration and heat during the operation of the mechanical seal, it is usually related to the following factors:
The end face of the dynamic and static ring is rough: resulting in increased friction, heat and vibration.
Improper clearance: The clearance between the static ring and the sealing chamber is too small, causing collision and vibration.
Insufficient cooling: The sealing surface lacks sufficient cooling, resulting in high temperature.
Medium problem: the medium contains suspended particles or crystals, blocking the sealing surface, affecting the sealing effect.
Second, the treatment of mechanical seal failure
- Leakage treatment
Check the sealing surface: Observe whether the sealing surface has signs of wear, hot cracking, deformation, etc., and replace the sealing ring if necessary.
Adjust assembly: Ensure that the sealing surface is not damaged during installation and that the sealing surface is fully fitted.
Check the spring: confirm whether the spring is intact and the amount of compression is appropriate.
Replace auxiliary seals: Inspect and replace damaged auxiliary seals to ensure that their material, size and assembly meet requirements.
- Vibration and heat treatment
Improved lubrication and cooling: Ensure adequate lubrication and cooling of the sealing surface to reduce friction and heat generation.
Adjust the gap: increase the inner diameter of the sealing cavity or reduce the outer diameter of the rotating part to ensure a suitable gap.
Cleaning the medium: improve the filtration and separation effect of the medium, reduce the impact of suspended particles and crystals on the sealing surface.
Check the accuracy of the device: Ensure that the accuracy of the device meets the requirements to avoid seal failure caused by misalignment and vibration.
Third, mechanical seal failure analysis
- Improper design and selection
The design and selection of mechanical seals should fully consider the characteristics of the medium, working pressure, temperature and other factors. Improper selection may lead to the sealing surface material is not corrosion resistant, not temperature resistant, or the sealing structure is unreasonable, thus affecting the sealing effect.
- Improper installation
Any negligence during installation may result in failure of the mechanical seal. For example, the sealing surface is not carefully cleaned and checked before installation, the uneven force during installation leads to the deformation of the sealing surface, or the assembly is not carried out in accordance with the technical requirements.
- The device is faulty
The accuracy, operating state and working environment of the equipment have an important impact on the performance of the mechanical seal. If the equipment is not centered, the vibration is too large, the temperature is too high or too low, it may lead to the failure of the mechanical seal.
- Media problem
Suspended particles, crystals or corrosive substances in the medium may block the sealing surface and affect the sealing effect. In addition, the temperature, pressure and other parameters of the medium may also have an adverse effect on the mechanical seal.
Iv. Conclusion
The fault treatment and analysis of mechanical seals need to consider many factors such as design selection, installation process, equipment status and media characteristics. Through reasonable selection, correct installation, regular inspection and maintenance, and timely troubleshooting, the stable operation of mechanical seals can be ensured and their service life can be extended. I hope this article can provide readers with useful reference and help.
