Mechanical seal for kettle What are the requirements of gear oil pump for mechanical seal?

Mechanical seal, also known as mechanical seal, is a dynamic seal for rotating shaft. Mechanical seal has reliable performance, small leakage, long service life and low power consumption. It does not need frequent maintenance, and can meet the sealing requirements of production process automation, high temperature, low temperature, high pressure, vacuum, high speed and all kinds of corrosive media of strong corrosion mechanical seal, including solid particle media and other harsh conditions Mechanical seal is a shaft seal device that can prevent leakage by one or more pairs of opposite lubricated end faces perpendicular to the shaft, under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, and by matching with auxiliary seals The requirements of gear oil pump for mechanical seal, mechanical seal and soft packing seal are compared as follows:

Advantages:

(1) The sealing is reliable, the sealing state is very stable in long-term operation, and the leakage is very small, about 1% of the leakage of soft packing seal:

(2) Long service life, generally 1~2 years or longer in oil and water medium mechanical seals, and more than half a year in chemical medium:

(3) The friction power consumption is small, and the friction power is only 10%~50% of that of soft packing seal

(4) The shaft or shaft sleeve is basically free of friction loss:

(5) The maintenance cycle is long. After the end face is worn, it can be automatically compensated. In general, the mechanical seal without water pump needs regular maintenance:

(6) Good seismic resistance, insensitive to vibration of rotating shaft and deflection of shaft to sealing chamber:

(7) The mechanical seal can be used in high temperature, low temperature, high pressure, vacuum, different rotation frequencies, as well as various corrosive media and abrasive media

Disadvantages:

(1) Relatively complex, with high processing requirements

(2) Installation and replacement are troublesome, and workers are required to have a certain level of skill

(3) It is difficult to deal with accidental accidents

Preparation before sealing with high price:

(1) Check whether the model and specification of the mechanical seal meet the requirements of the design drawing, so whether the parts (especially the sealing surface and auxiliary sealing ring) are damaged, deformed, cracked, etc. If there are defects, they must be replaced or repaired

(2) Check whether the matching size, roughness and parallelism of all parts of the mechanical seal meet the design requirements

(3) When using small spring mechanical seal, check whether the length and rigidity of small spring are the same

(4) Check whether the displacement, swing and degree of rotation of the main engine meet the technical requirements, whether the seal chamber meets the installation dimensions, and whether the seal end cover is vertical to the shaft. General requirements: the shaft displacement is not more than ± 0.5mm, the shaft swing (at the rotating ring seal ring) is not more than 0.06mm, and the maximum degree of rotation of the shaft is not more than 0.05mm. The allowable difference of non perpendicularity between the contact plane of the seal end cover and the gasket and the centerline is 0.03~0.05mm

(5) Keep clean, especially the sealing surfaces of rotating ring, stationary ring and auxiliary sealing ring shall be free of impurities and dust. It is not allowed to wipe the sealing surface with unclean non wiping

(6) It is not allowed to knock the sealing element with tools to prevent the sealing element from being damaged