Several cooling methods of mechanical seal

Flushing type cooling: When the temperature of the sealing medium is 0~80t, usually the mechanical seal is purchased with flushing type cooling. The inlet of the flushing fluid is aligned with the friction surface. The purpose of flushing is to keep the temperature of the friction surface within a certain range and to prevent the accumulation of impurities near the seal face. This is a commonly used cooling method, which can be divided into self-flushing and external flushing.​​

The inner body flushing uses the sealed medium as the flushing liquid, which can be applied to the general pump and mechanical seal equipment. A small part of the liquid is drawn from the pump outlet, directly flushes the friction end face, and then flows into the pump cavity. When conveying high temperature or medium with particles, a cooler or filter can be added to the pipeline between the pump outlet and the flushing inlet.​​

External flushing is a separate flushing fluid system for flushing and cooling. It is mostly used to seal high temperature or particle-containing media, but its structure is more complicated.​​

Static ring back cooling: In this cooling method, the cooling medium (such as water) is directly sent to the friction end face that needs to be cooled through the back of the static ring, and the cooling medium and the working medium are not mixed. This cooling method has a simple structure, good effect, and a wide range of applicable temperatures. But its disadvantage is that the hardness of cooling water is required to be low, especially the sealing of high temperature medium. Because the hardness of the water is high, scale will be generated on the shaft near the end face of the seal and the seal will fail. At the same time, it is necessary to prevent the cooling water from leaking out along the extension end of the shaft. Cooling of the outer periphery of the stationary ring: In order to solve the problem of scale, the outer periphery of the stationary ring is cooled. This method avoids the generation of scale on the shaft or the shaft sleeve because the cooling water does not directly contact the shaft or the shaft sleeve, and also prevents the water along the shaft. Axial leakage on the atmospheric side can reduce the quality of cooling water, but its cooling effect is not as good as the cooling of the back of the static ring.