Little Knowledge Of The Mechanical Seals Knowledge
Mechanical seals packaging machine in a machine plays a very important role in the
decision good or bad mechanical seals mechanical performance during use and maintenance of the frequency, I give you the following brief mechanical seals knowledge. We Ningbo Cixi Hongye Sealing & Packing Co., Ltd. will be in strict accordance with national standards, higher than the national standard.
Mechanical seals are precision, structural basis for the more complex mechanical components is one of a variety of pumps, reaction kettle, turbo compressors, diving equipment, electrical and other key components. The sealing performance and service life depends on many factors, such as selection, the machine precision, the correct installation and so on.
I. Selection method
Packing mechanical seals according to the nature of working conditions and the different media, with high temperature, low temperature mechanical seals, high pressure, corrosion-resistant mechanical seals, mechanical seals and medium resistance to particle vaporization of light hydrocarbons easily adapt to the mechanical seals and other media, should the usefulness of selecting different structural types and materials of mechanical seals.
Selection of the main parameters are: sealed chamber pressure (MPa), fluid temperature (), working speed (m / s), fluid sealing characteristics and installation of effective space.
Selection of the basic principles are:
1. Under the seal chamber pressure to determine the sealing structure using balanced or unbalanced type, such as single face or double face.
2. According to the speed of work, determine the use of rotary or static, fluid dynamic pressure type non-contact type.
3. According to the temperature and fluid properties, determine the friction pair and the secondary sealing material, as well as the right choice lubrication, washing, heat, cooling, mechanical seals loop protection system.
4. According to the effective installation of sealed space, determined by a single spring or multiple springs or wave springs, Built-in or externally mounted.
Second, mechanical seals installation and use requirements
1. Packaging machinery sealing machine precision requirements (for example pump mechanical seals)
2. Rotor axial movement of not more than 0:3 mm.
3. Sealed chamber combined with the positioning and sealing cover end face of the shaft (or sleeve) beating the surface of the maximum tolerance of no more than 0:04 ~ 0:06 mm.
Third, the installation
Installation method with the mechanical seals type, different types of machines vary, but the installation of almost all essentials the same installation steps and precautions are as follows:
1. Install installation to determine the size, should be the product manual or the sample size to ensure the installation of mechanical seals.
2. Loaded before the shaft (sleeve), gland should be no burr, bearing in good condition; seals, shaft seal cavity, gland should be cleaned. To reduce friction, shaft installation of mechanical seals packaging machine such parts to be coated with a thin layer of oil
3. First stationary ring and the gland together on the shaft, careful not to collide with the axis, and then ring components into. Block Spring Block or drive several times set screws should be tightened evenly.
Fourth, the use
1. When the transmission medium temperature too high, too low, or contain impurities particles, flammable, explosive, toxic, must take the appropriate block letters, washing, cooling, filtration and other measures.
2. Run before hand drive cars, pay attention to whether the torque is too large, with or without a collision and abnormal voice.
3. Note rotation, whether the coupling, the bearing parts of the lubricant additive is appropriate piping is correct.
4. Running before the first medium, the cooling water valve to open, check the seal chamber is full of gas discharge, to prevent static pressure caused by leakage, and then switched on.
5. After the work is normal and stable driving, whether caused by abnormal axial rotation torque, and abnormal noise and overheating.
by: lucy00123
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