Mechanical seals are delicate and complex mechanical structure is one of the basic components, is all sorts of pumps, synthesis reaction kettle, key components of the turbine compressor, submersible motors and other equipment.The sealing performance and service life depends on many factors, such as selection, the precision of the machine, the correct installation use, etc.
Mechanical seal selection methods:
Mechanical seal according to the working conditions and the properties of medium, there are high temperature resistant, resistant to low temperature mechanical seal, mechanical seal, high pressure resistance and corrosion resistance of granules medium mechanical seal and adapt to vaporize the mechanical seal of light hydrocarbon medium, etc., should be according to the different use to select different structure and materials of mechanical seal.
Selection of main parameters are: seal cavity pressure (MPa), fluid temperature (℃), the working speed (m/s), the characteristics of the fluid and install sealed effective space, etc.
The basic principles of selection of mechanical seals are as follows:
1. According to the sealed cavity pressure, determine the seal structure is balanced or unbalanced type, single or double face, etc.
2. According to the working speed, determination by rotating or stationary type, the hydrodynamic pressure type and non-contact type.
3. According to the temperature, and fluid properties, determine the friction pair and auxiliary sealing material, as well as the correct selection of lubrication, flushing, insulation, cooling and other mechanical seal protection system etc.
4. According to the installation of sealed space effectively, identify with spring or single spring or waveform spring, built in or outside the container type