Mechanical seal is a sophisticated, complex structure of the mechanical basis of one of the components, is the vacuum pump, diaphragm pump key components. The sealing performance and service life depends on the vacuum pump, diaphragm pump selection, the accuracy of the machine, the correct installation and use.
Seal selection principle:
Mechanical seal according to the working conditions and the nature of the media, a high temperature, low temperature mechanical seal, high pressure, corrosion-resistant mechanical seal, mechanical seal resistant to particulate media and easy to vaporize light hydrocarbon medium mechanical seal should be based on different The use of different structures and materials selection of mechanical seal. Selection of the main parameters are: sealed chamber pressure (MPa), the fluid temperature (℃), the working speed (m / s), the fluid properties and the effective space to install the seal.
The basic principles of selection of the following four:
1, according to the pressure in the sealed chamber, determine the seal structure using balanced or unbalanced, single-ended or double-ended and so on.
2, according to the speed of work, to determine the use of rotary or static, hydrodynamic or non-contact type.
3, According to the temperature and fluid properties, determine the friction pair and auxiliary sealing materials, and the correct choice of lubrication, washing, insulation, cooling and other mechanical seal cycle protection system.
4, according to the installation of effective space sealed to determine the use of multi-spring or single spring or wave spring, built-in or external.
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