Common materials and selection principles of mechanical seals

Mechanical seals are one of the basic components of machinery with precision and complex structures, and are key components of various pump equipment. For mechanical pumps, the cause of leakage problems with a probability of more than 50% is often the mechanical seal.

Machine seal selection method:

According to different working conditions and medium properties, mechanical seals include high temperature resistant and low temperature resistant mechanical seals, high pressure resistant and corrosion resistant mechanical seals, mechanical seals resistant to granular media and mechanical seals suitable for light hydrocarbon media that are easy to vaporize. The usefulness of selecting different structural types and materials of mechanical seals.

The main parameters of type selection are: seal chamber pressure (MPa), fluid temperature (°C), working speed (m/s), fluid characteristics and effective space for installing seals, etc.

The basic principles of selection:

1. According to the pressure of the sealing cavity, it is determined that the sealing structure is balanced or unbalanced, single-end or double-end

Face and so on.

2. According to the working speed, determine the use of rotary or static, fluid dynamic pressure or non-contact type.

3. According to the temperature and fluid properties, determine the friction pair and auxiliary sealing material, and correctly select the lubrication,

Flushing, heat preservation, cooling and other mechanical seal circulation protection systems, etc.

4. According to the effective space of the installation seal, it is determined to use multiple springs or single springs or wave springs, built-in type

or exterior mount.