1. Flushing function
Flushing function is the most basic function of mechanical seal system and the most common working mode of mechanical seal system. Liquid is injected directly into the high pressure side of single face seal or double face seal. Generally, mechanical seal should be flushed, especially for light hydrocarbon pump; flushing can achieve the purpose of isolating medium, cooling and improving lubrication. The purpose of isolating the medium can be achieved by injecting liquid compatible with the medium into the sealing cavity for external circulation flushing.
2. The function of regulating and controlling the temperature of the working environment of the mechanical seal
The mechanical seal system has the function of regulating and controlling the temperature of the working environment of the mechanical seal. Temperature adjustment and control include cooling and heat preservation. The medium with high saturated vapor pressure absorbs the mixing heat and friction heat of mechanical seal in the sealing cavity, which causes the temperature to rise; if the cooling and cooling are not carried out in time, it is likely that the abnormal medium will vaporize at the end surface, which will worsen the lubrication of the end surface and lead to the sealing effect. But for the medium easy to crystallize and solidify. The insulation measures shall be taken to prevent the medium from crystallization and solidification.
3. The function of regulating and controlling the working pressure of the seal
The mechanical seal system also has the function of regulating and controlling the working pressure of the seal: for the ordinary double face mechanical seal, the pressure of the isolated fluid in the seal cavity needs to be maintained slightly higher than that of the sealed medium, while in the step-by-step pressure reducing series mechanical seal, the pressure difference of the sealing fluid between stages needs to be maintained.
4. The functions of removing impurities and filtration
The impurities in the sealing fluid, such as fine solid particles and dirt are very harmful to the mechanical seal, which may cause serious abrasive wear on the seal face and may also block the i-line of the sealing system pipe. The sealing system has the functions of removing impurities and maintaining liquid cleanness. When the density of impurities is lower than the density of liquid medium, the impurities can be removed by filter; when the density of Ma impurities is higher than the density of liquid medium, the impurities can be removed by spiral liquid separator or mesh filter.
5. Fluid substitution function
It is very difficult to directly seal gas-phase medium and medium with high temperature or toxic and valuable medium, it is also difficult for medium that is easy to vaporize and form products and liquid-phase medium containing solid particles. The sealed medium can be replaced by double face mechanical seal with the help of mechanical seal system, and the medium with more difficult direct seal can be converted into the sealed medium with good sealing and lubricating performance and clean sealing performance.
In addition to the above functions, the sealing system also has the functions of flushing, diluting and transferring the normal leaking and harmful medium to health and environment.