Mechanical Seal Why Use Aids?
In Fluid Machinery (such as pumps, compressors
, agitator and centrifuge, etc.), working conditions should be considered the most demanding mechanical seal parts. As axial thrust bearings as force; as the heat exchanger as the heat generated by export. In the high temperature, high pressure, corrosive
And other parts have been difficult to achieve static seal, require high-speed rotation, in a few millimeters wide end seal the moving sealing surface is even more difficult. In order to solve this thorny problem, the long-term practice by Laos, people have found two ways: one
Is sealed structures and materials from start to adapt them to harsh working conditions. This is the cost of higher cost, however, not fundamentally solve the problem. Once the seal failure, serious consequences. Another way is through the support facilities to change
Good working environment. Currently, practical work without any aids mechanical seal is rare. Such as the use of tandem high-pressure and high temperature mechanical seal pump mechanical seal and so must be appropriate support facilities. Through facilities, certain
Harsh working environment acceptable to change the seal, so that the effect of greatly enhanced mechanical seals, using the scope is broader. Mechanical sealing friction generated heat, so that Seals temperature, if not take the appropriate facilities, will produce many
Adverse consequences.
1. The increase of temperature between the liquid film vaporization seal faces, wear increased, so that seal failure:
2. Temperature to produce thermal deformation ring movement, leakage increased, wear increased;
3. Temperature also increased the corrosion medium on the mechanical seal;
4. Auxiliary ring so that the aging temperature, deterioration and failure;
5. Temperature, synthetic resin impregnated graphite, carbon and the performance degradation due to resin, immersed metal graphite ring, because of the metal melt and leak.
Thus, the temperature rise is the mechanical seal does not allow the enemy. Auxiliary facilities in order to: reduce the temperature rise that people do not want to maintain good lubrication between seal faces state, so that each part of a good mechanical seal, normal work; in easy to steam
Of media to ensure that the pressure in the sealed chamber, so that no vaporization; pump seal at low temperature can play the role of insulation and heating; For the crystallization of solid particles occurs and the seal of strong corrosive medium, but also remain sealed not compromised. Therefore, it is
The auxiliary system, known as the national protection system. 1983 China Petrochemical Corporation was organized on the pump seal seven petrochemical investigation said: "The imported seal centrifugal pump and compressor, according to different conditions with different ancillary facilities
. Proved. Often reasonable structure, material good and ignore the ancillary facilities, resulting in difficult working conditions. Lead to early seal failure. On the contrary, some occasions the structures and materials is not enough to meet the requirements of working conditions, use of effective secondary
Help facilities, the results prompted sealed to meet the requirements of working conditions, smooth operation. "
Some mechanical sealing temperature, pressure and speed is not too high, you can work without aids. However, the stability and service life of sealing point of view to consider, with supporting facilities is beneficial. Therefore, support facilities should be as
Mechanical seal part of the work under different conditions, different support facilities. Common international standards for the American Petroleum Institute (centrifugal APl610), which have made specific provisions. Proper and reasonable use facilities, not only
The stability of the seal and extend the life of the great significance; on safe production and to reduce leakage, reduce the maintenance workload and reduce production costs to a certain extent, must be given adequate attention. It was known as the seal through the support facilities
Ring protection system, or referred to as sealed system or protection system.
by: lucy00123
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