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Gear pump on the mechanical seal requirements
Mechanical seal, also known as the mechanical seal, is a dynamic seal for the rotating shaft. The mechanical seal has reliable performance, small amount of leakage, long service life and low power consumption. It does not need regular maintenance and can be adapted to the production process automation and high temperature, low temperature, High pressure, vacuum, high speed and a variety of highly corrosive media. Containing solid particulate media and other harsh conditions of the hungry seal requirements. Mechanical seal is by one or several pairs of perpendicular to the shaft for relative lubrication of the end face in the fluid pressure and compensation mechanism (Or magnetic force) under the effect of maintaining engagement and with the secondary seal to achieve the leakage of shaft seal device. Gear pump mechanical seal requirements, mechanical seals and soft packing seal as follows: Advantages: 1) reliable sealing, In the long-term operation of the seal is very stable, the amount of leakage is very small, the leakage is about 1% of the soft packing seal: 2) long life, in oil and water media generally up to 1 to 2 years or longer in the chemical industry Medium generally work for more than six months: 3) Low friction power consumption, the friction power is only 10% ~ 50% of the soft packing seal 4) Shaft or sleeve basically does not wear: 5) Long maintenance cycle. Automatic compensation, under normal circumstances do not need 6) Good vibration resistance, vibration to the rotating shaft and insensitive to the deflection of the sealed chamber 7) Wide range of application, mechanical seal can be used for high temperature, low temperature, high pressure, vacuum, different rotation frequency, and Various corrosive media and seals containing abrasive media Disadvantages: 1) more complex, high processing requirements 2) installation and replacement is too much trouble, requiring workers have a certain level of technology 3) in the event of accidental handling more difficult. Pre-seal preparation: 1) Check the mechanical seal model. Whether the specifications meet the requirements of the design drawings, so parts (especially sealing surface, auxiliary seal) for damage. Deformation. Cracks and other phenomena, if any defects, you must Replacement or repair 2) Check the mechanical seal parts with the size, roughness, parallelism meets the design requirements 3) When using a small spring mechanical seal should check the length and stiffness of the small spring is the same 4) Check the host of the amount of movement. Swinging amount and degree of compliance meet the technical requirements, the sealing chamber is in line with the installation of standards, the sealing end cover and the shaft is vertical, the general requirements: Shaft runout is not greater than ± 0.5mm: Shaft swing (rotating ring seal) is not greater than 0.06 mm: The maximum degree of deviation of not more than 0.05mm: Seal end cap and gasket contact plane to the centerline of the non-perpendicularity should be poor 0.03 ~ 0.05mm. 5) should be kept clean, especially the rotating ring and stationary ring sealing surface and auxiliary ring surface Should be free of impurities. Dust. Do not answer the unclean use not clean the sealing surface. 6) do not answer the application of tools percussion sealing element to prevent the seal is damaged.