Mechanical seals are one of the basic components of precision machines. Mechanical seals

Mechanical seals are one of the basic components of precision machines

2021-08-16 10:21

Mechanical seal is one of the basic components of precision machines, with a relatively complex structure. It is a joint part of various pumps, reactive and synthetic sealing devices, turbo compressors and submersible motors. The tightness and service life of the seal depends on the selection, accuracy and correctness of installation and use of the machine equipment. The sealing capacity related to centrifugal force is also increased.

Selection skills:

Due to the differences in the working conditions and medium characteristics of mechanical seals, there are mechanical seals that are resistant to high temperature, low temperature, high pressure, corrosion, and granular media, and mechanical seals that are suitable for light hydrocarbon media that are easy to evaporate, so they should be used according to the application. Choose different structural types and materials for different mechanical seals.

The main parameters selected are: seal chamber pressure (MPA), liquid temperature (°C), working speed (M/S), liquid-liquid characteristics and space for installing the seal, etc.

The selection principles of mechanical seals for seal manufacturers are:

According to the pressure of the sealing chamber, the sealing structure can be balanced or unbalanced, such as single end face or double end face, etc.

According to the operation speed, it can be rotated or consolidated, hydraulic pressure or non-contact.

According to the temperature and the characteristics of the fluid, select the material of the auxiliary seal and the auxiliary seal, as well as the circulation protection system of the mechanical seal such as lubrication, flushing, heat preservation, and cooling.

According to the size of the installation space of the mechanical seal, multiple springs or single springs or wave springs are used, either inside or outside. There are impurities deposited on the veneer of the mechanical seal.

The technical requirements for installation and use are relatively high, especially sensitive to shaft shifting and shaft jumping. During machine maintenance, the bearings and motors should be adjusted strictly and finely.