hot mechanical seals The basic principle of
Thermal mechanical seal are delicate, complex mechanical structure is one of the basic components, is all sorts of pumps, chemical pump mechanical seal shall be synthetic kettle, key components of the turbine compressor, submersible motors and other equipment. Its sealing performance and service life depend on many factors, such as type selection, precision of machine, correct installation and so on.
1. Selection method
Mechanical seal according to the working conditions and dielectric properties of textile printing and dyeing machinery seal is different, have a 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 container type mechanical seal and install effective space of the seal, etc.
The basic principle of selection is:
1. Determine the seal structure with balanced or unbalanced type, single end face or double end face, according to the pressure of seal chamber.
2. According to the working speed, the fluid dynamic pressure type or non-contact type is determined by rotating or static type.
3. According to the temperature and fluid properties, the friction pairs and auxiliary sealing materials should be determined, as well as the correct selection of mechanical seal circulation protection system such as lubrication, flushing, heat preservation and cooling.
4. According to the effective space of the installation seal, the multi-spring or single spring or corrugated spring shall be adopted, which shall be installed in or outside.
Installation and use of mechanical seals
1. Mechanical seal requirements for machine precision (in case of mechanical seal of pump)
(1) the radial runout tolerance of the shaft (or axle sleeve) of the installed mechanical seal is not greater than 0.04 ~ 0.06 mm.
(2) the rotor axial movement shall not exceed 0.3 mm. =
(3) the locating end of the joint of the sealing cavity and the sealing end is the maximum difference of 0.04 ~ 0.06mm on the surface of the shaft (or axle sleeve).
2. Confirmation of seals
(1) confirm whether the installed seal is in accordance with the required model.
(2) before installation, carefully check with the general assembly drawing, the number of parts is complete.
(3) the mechanical seal is adopted and coil spring drive. The spring has a left and right rotation and must be selected according to the rotation of the rotation axis.