Views: 0 Author: Site Editor Publish Time: 2021-09-27 Origin: Site
Seal ring is the general name of dynamic ring and static ring, which is the most important component of mechanical seal. The seal ring largely determines the performance and life of the mechanical seal; therefore, some requirements are made for it.
In addition to seals, there are many important components in a mechanical seal that need to be given adequate attention. Let's learn more about them.
This passage is going to talk about the followings of mechanical seal:
1) System components of mechanical seals
2) Technical Requirements of Seals
3) Choose our best Mechanical seals
Shaft seal box
In the past, the shaft seal box for mechanical seals was a stuffing box designed for soft packing seals. It is not suitable for holding mechanical seal, not only the size is too small, the clearance is too narrow, and the simple cylindrical shape is not suitable.
Foreign countries have developed the standard of mechanical seal shaft seal box with increased size. In addition, the U.S.A. Duramitec company and the British Fluid Mechanics Research Group are studying a reasonable mechanical seal shaft seal box, the shape should not only be conducive to fluid flow and heat dissipation, but also should be conducive to the removal of solid particles, causing a good surrounding environment for the seal.
Volatile matter escape control
In the past, only pay attention to the elimination of visible fluid leakage, but do not pay attention to the invisible volatile escape control, which will cause environmental pollution and dangerous to the device and the person. Overseas, such as the American Institute of Friction and the Institute of Lubrication Engineers Seals Technical Committee developed SP-30 (1994), SP-32 (1990) and SP-33 (1991) with mechanical seals rotating machinery, compressors and screw systems to control volatile fugitive regulations guidelines. SP-30 is implemented in three phases. It specifies the definition of blocking fluid and buffering fluid, and clarifies wrong and confusing concepts. A blocking fluid is a fluid introduced between double seals that completely blocks the process fluid from leaking into the surrounding environment. The pressure of the blocking fluid is always higher than the pressure of the process fluid being sealed. A buffer fluid is a fluid used as a lubricant or buffer between double seals. The buffer fluid pressure is always lower than the pressure of the process fluid being sealed.
Auxiliary system support
Mechanical seal auxiliary system has cooling, heating, flushing and other systems need to be matched, pump circulation needs to be optimized, state monitoring system and other issues in the study to solve. In the API-682 standard, the auxiliary system is specified.
Gas obstruction sealing system
In the past, the blocking seal system commonly used liquid blocking liquid or liquid blocking gas in order to simplify the huge blocking liquid system, change the blocking gas to block the liquid or gas blocking seal system can be used in the spiral groove gas seal and blocking gas, floating set and blocking gas, etc. to block the gas and liquid.
Adequate strength and stiffness
Under the working conditions (such as pressure, temperature and sliding speed, etc.) is not damaged, deformation should be as small as possible, and the sealing can still be maintained when the working conditions fluctuate. In particular, the sealing end face should have sufficient strength and certain corrosion resistance to ensure that the product has a satisfactory service life.
Good thermal shock resistance
To this end, the material is required to have a high thermal conductivity and a small coefficient of linear expansion to withstand thermal shock without cracking.
Smaller coefficient of friction
Seal ring matching should have a small coefficient of friction.
If a short period of dry friction occurs during work, it will not damage the sealing end face. Therefore, the seal ring should have good self-lubrication, seal ring material and sealing fluid also have good wettability.
Seal ring structure should strive to simple symmetry, give priority to the use of the overall structure, can also be used in combination (such as mounted) seal ring, try to avoid the use of sealing end spray type structure.
Easy installation and maintenance
Seal ring should be easy to process and manufacture, installation and maintenance should be convenient.
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