Working principle of mechanical seal Mechanical seal, also known as mechanical seal, is a dynamic seal for rotating shaft. The mechanical seal has reliable performance, small amount of leakage, long service life and low power consumption. It does not need regular maintenance and can be adapted to the production process automation And high temperature, low temperature, high pressure, vacuum, high speed and a variety of strong corrosive media. Containing solid particulate media and other harsh conditions of the hungry seal requirements. Mechanical seal is by one or several pairs perpendicular to the axis of the relative movement of the end face in Fluid pressure and the compensating mechanism elastic (or magnetic) to maintain the engagement and with the secondary seal to achieve the leakage seal shaft seal gear pump mechanical seal requirements, the mechanical seal and the soft packing seal as follows:
advantage:
1) Sealed, reliable, long-term operation of the seal is very stable, the amount of leakage is very small, the leak is about 1% of the soft packing seal:
2) long service life, generally up to 1 ~ 2 years or longer in oil and water medium, generally working in chemical medium for more than half a year:
3) Power consumption is small, its frictional power is only 10% ~ 50%
4) The shaft or sleeve is basically not worn:
5) long maintenance cycle. End face wear can be automatically compensated, under normal circumstances do not need regular maintenance:
6) Good shock resistance, vibration of the rotating shaft and shaft insensitivity to the seal chamber deflection:
7) wide range of applications, mechanical seals can be used for high temperature, low temperature, high pressure, vacuum, different rotation frequency, and a variety of corrosive media and abrasive media containing the seal.
Disadvantages:
1) more complex, demanding processing 2) installation and replacement is too much trouble, requiring workers to have a certain level of technology 3) incidental accidents, the handling more difficult.
High price seal before the preparatory work:
1) Check the model number of the mechanical seal. Whether the specifications meet the requirements of the design drawings, so there is no damage to the parts (especially the sealing surface and auxiliary sealing ring). Deformation, cracks and other phenomena, if defective, must be replaced or repaired 2) Check the machinery Seal the parts with the size, roughness, parallelism meets the design requirements 3) When using a small spring mechanical seal, should check the length and stiffness of the small spring is the same 4) Check the host of the amount of run-in. Technical requirements, the sealing chamber is in line with the installation of standards, the sealing end cap and the shaft is vertical, the general requirements: Shaft movement is not greater than ± 0.5mm: Shaft swing (rotating ring seal) is not greater than 0.06mm: Greater than 0.05mm: seal end cap and gasket contact plane perpendicular to the center line of the non-perpendicularity should be poor 0.03 ~ 0.05mm
5) should be kept clean, especially the rotating ring and stationary ring seal surface and auxiliary seal surface should be free of impurities. Dust. Do not answer the application of unclean not clean seal surface.
6) Do not allow the tool to hit the sealing element to prevent the seal from being damaged.
Unsaturated polyester resin is a polymer obtained by the polycondensation reaction between polyacids and polyalcohols. The development of water is the by-product of this polycondensation process. Specifically, the Unsaturated Polyester Resin, also known by the English acronym UPR, is an easily printable liquid polymer which, once cured (cross-linked with styrene, by the use of particular substances, organic peroxides, named hardeners), keeps the solid shape taken in the mold. The items so realized have exceptional strength and durability characteristics. Unsaturated polyester resins are mostly used in combination with reinforcing materials such as glass fibres, that give life to the FRP (an acronym deriving from the English), a polyester reinforced with glass fibres, better known with the name of fiberglass.
Unsaturated Polyester Resin
Unsaturated polyester resin
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