Type 206 of 304

Mechanical seal is one of the precision and complex mechanical basic elements, and it is the key component of various pumps, reaction synthesis kettles, turbine compressors, submersible motors and other equipment. Its sealing performance and service life depend on many factors, such as model selection, machine accuracy, correct installation and use, etc.

According to different working conditions and medium properties, mechanical seals include high-temperature and low-temperature resistant mechanical seals, high-pressure and corrosion resistant mechanical seals, particle resistant mechanical seals, and mechanical seals suitable for light hydrocarbon media that are easy to vaporize. Mechanical seals with different structures and materials shall be selected according to different uses.

The main parameters of model selection include: pressure of sealing chamber (MPa), fluid temperature (℃), working speed (m/s), fluid characteristics and effective space for installing seals.

The basic principles of model selection are:

1. According to the pressure of the sealing chamber, determine whether the sealing structure is balanced or unbalanced, single end or double end.

2. According to the working speed, the rotary type or static type, hydrodynamic type or non-contact type shall be adopted.

3. According to the temperature and fluid properties, determine the friction pairs and auxiliary sealing materials, and correctly select the lubrication, flushing, insulation, cooling and other mechanical seal cycle protection systems.

4. Multiple springs or single springs or Wave spring , internal or external.