The mechanical seal belongs to the mechanical basic element mechanical seal with a relatively complex structure.

The mechanical seal is a mechanical basic element with a relatively complex structure.

2021-06-26 09:31

Mechanical seal is one of the basic components of machinery with strict structure and relatively complex structure. It is a key component of various mechanical seal pumps, reaction synthesis kettles, turbo compressors, submersible motors and other equipment. The sealing performance and service life of mechanical seals depend on many factors, such as type selection, machine accuracy, correct installation and application, etc.

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 function 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 useful space for installing the seal, etc.

The basic criteria for selection are:

1. According to the pressure of the sealing cavity, it is determined that the sealing structure adopts uniform or non-uniform type, single end face or double end face, etc.

2. According to the working speed, it is determined to adopt the torsional or static type, the fluid dynamic pressure type or the non-contact type.

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, and cooling, etc.

4. According to the effective space of the installation seal, determine the use of multiple springs or single springs or wave springs, built-in or external.