standard seals According to working conditions
Standard seal is one of the most complex mechanical base components of precision and structure. It is a key component of all kinds of pump, anti-chemical pump standard seal, synthetic kettle, turbine compressor, submersible motor and other equipment. The sealing performance and service life depend on many factors, such as selection, machine accuracy, proper installation and so on.
First, the selection method
Standard seal according to the working conditions and the nature of the textile printing and dyeing standard seal different, high temperature, low temperature standard seal, high pressure, corrosion resistance standard seal, resistant to granular media standard seal and to adapt to easy vaporization of light hydrocarbon medium standard seal , Should be based on different uses of different structural types and materials to choose the standard seal.
The main parameters of the selection are: sealed chamber pressure (MPa), fluid temperature (℃), working speed (m / s), the characteristics of the fluid assembly standard seal and the installation of the effective space for sealing.
The basic principles of selection are:
1. According to the sealing chamber pressure, to determine the sealing structure using balanced or non-balanced type, single-ended or double-ended and so on.
2. According to the speed of work, to determine the use of rotary or static, hydrodynamic or non-contact type
3. According to the temperature and fluid properties, to determine the friction and auxiliary sealing materials, and the correct selection of lubrication, washing, insulation, cooling and other standard sealed cycle protection system.
4. According to the installation of the effective space of the seal, to determine the use of multi-spring or single spring or wave spring, built-in or exterior type.
Second, the standard seal installation and use requirements
1. Standard seal on the machine accuracy requirements (to pump standard seal as an example)
(1) The radial runout tolerance of the shaft (or sleeve) of the standard seal is not to exceed 0.04 to 0.06 mm.
(2) the rotor axial movement does not exceed 0.3mm.
(3) The tolerance of the positioning end to the shaft (or sleeve) surface of the sealing chamber and the sealing end cover is not more than 0.04 to 0.06 mm.
2. Confirmation of seal
(1) Check that the installed seal is in accordance with the required model.
(2) before the installation carefully carefully with the assembly diagram, the number of parts is complete.
(3) the use of circular spring and the standard seal, the spring left and right of the points, according to the rotation of the shaft to choose.