Selection method and principle of mechanical seal

Mechanical seals are one of the basic mechanical components with relatively complex structures, and are key components of various mechanical seal pumps, reaction synthesis kettles, turbo compressors, submersible motors and other equipment. Its sealing performance and service life depend on many factors, such as selection, so the method and principle of its selection will be introduced next.

1. 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), characteristics of fluid mechanical seal, and effective space for installing the seal, etc.

The basic principles of model selection are:

1. According to the pressure of the sealing cavity, it is determined that the sealing structure adopts a balanced or unbalanced type, a single end face or a double end face, etc.

2. Depending on the working speed, determine the use of rotary or static, hydrodynamic or non-contact.

3. According to the temperature and fluid properties, determine the friction pair and auxiliary sealing material, and correctly select the mechanical seal cycle protection system such as lubrication, flushing, heat preservation, cooling, 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 or outside-mounted.

In short, the selection of mechanical seals according to the above method can better ensure the use of equipment and related performance, prolong the use and reduce damage.