The rotating joint: mechanical seals use common sense

A mechanical seal, the selection method Mechanical seal according to working conditions and different nature of medium, high temperature resistant, good low temperature resistance mechanical seal, resistance to high pressure, corrosion resistance of mechanical seal, resistance to particulate medium mechanical seal and adapt to slip rings the light hydrocarbon vapors to the medium of the mechanical seal, should according to different use choosing different structure and material of mechanical seal.

The selection of main parameters is: seal chamber body pressure (MPA), fluid temperature (), working speed (M/S), the characteristics of fluid and installation of the seal of effective space, etc. The selection of basic principle for the:
1. According to seal chamber body pressure, determine the sealing structure with balancing or not balance type, single or double end face, etc.
2. According to the speed of work, make sure the rotary or motionless, the fluid dynamic pressure type or non-contact.
3. According to temperature and fluid properties, determine the friction pair and assisting sealing materials, and choose the correct lubrication, washing, heat preservation, cooling mechanical seal circulation protection system, etc.
4. According to the installation of the seal of effective space, make sure the spring or a single spring or waveform spring, loading or within the loading. Second, mechanical seal the installation and operation requirements 1 and mechanical seal to through bore slip rings the machine precision requirements (to pump with mechanical seal for example)
(1) installation mechanical seal parts of the axis (or are) the biggest radial beat tolerance not more than 0.04 ~ 0.06 MM.
(2) the rotor shaft to channel not more than 0.3mm moving.
(3) seal chamber body and cover with the positioning of the sealing face axis (or are) the biggest surface beat tolerance not more than 0.04 ~ 0.06 MM. 2, seal confirmation
(1) to confirm that the installation of the seal and requirements of the model are consistent.
(2) carefully before installation and assembly figure controls, the number of parts is all ready.
(3) the adoption and circle the spring drives mechanical seal. The spring has left, dextral cent, must accord to the spin axis have choice.
3, installation Installation method with mechanical seal type, different kinds of machines and somewhat different, but the installation bring are nearly identical, the installation process and pay attention to the following matters:
(1) to determine the size of the installation When installation should be according to the use of the product manual or sample, and ensure the installation of mechanical seal size.
(2) in front axle (collar), gland should be no burr, bearing in good condition; Seal, shaft, seal chamber, gland should be cleaned clean. To reduce friction resistance, shaft installation mechanical seal to Mercury Slip Rings the parts of the thing to coat with oil, for lubrication, considering the rubber o-ring XiangRongXing of, if not oil, can besmear soap water. Float loading static ring with the structure of the not presenting, unfavorable with oil, should be dry in the gland.
(3) to ring and static pressure covers on the shaft together. Take care not to and shaft together, and then will move ring component load. Spring seat or drives a tight set screw within a few times evenly on tight. Not fixed before gland, and on compensation for axial compression ring, loosen the compensation can automatically return after ring without card lag phenomenon, then will gland to screw evenly lock.