External components that affect the service life of mechanical sealsMechanical seals

External components that affect the service life of mechanical seals

2021-09-06 10:23

1. About the service life of mechanical seals

In the mechanical seal, the main wear is the end face of the sealing pair, because the wear amount of the sealing end face is not large under normal working conditions, such as the graphite pair with an average coefficient of 0.75, the wear amount is about 0.1 micron per hour in water and engine oil , That is to say, the wear amount of 10,000 hours of continuous operation is about 1 mm, which shows that the wear amount of the debate pair generally does not affect the life of the mechanical seal. Generally, mechanical seals can be used continuously for 1 to 2 years, and it is no problem that they can be used for 5 to 10 years in some places. The premise of the above life is that the mechanical seal operates under the allowable working conditions, such as the movement and runout of the shaft, the concentration of medium particles, temperature, corrosion and other components.

External components that affect the life of mechanical seals:

1. The displacement of the pump shaft is large

2. The axial force is too large

3. The disturbance of the pump shaft is too large

4. Help flush the system for unreasonable

2. Specifications on the amount of catharsis

my country's JB4127.1-1999 'Technical Conditions for Mechanical Seals' stipulates:“In the environment of reasonable selection, correct placement and application, and when the sealed medium is clean water, oil and similar media, the service life of the mechanical seal is generally not less than one year. When the sealed medium is corrosive medium, the service life of the mechanical seal is generally 6 months to 1 year. However, when the application conditions are harsh, it is not limited to this.”Sealing test, the average leakage volume is not more than 5mL/h when the outer diameter of the shaft (or sleeve) is greater than 50mm, and the leakage volume is not greater than 3mL/h when the outer diameter of the shaft (or sleeve) is not greater than 50mm