Porous mechanical seal Principle and Application

Car, that ring does not rotate, the spring force, the stationary ring plane static and dynamic sealing rings, so that the fluid medium to be sealed. When the ring rotates, the surface of the stationary ring has many pores, rotating ring and the stationary ring so that the surface pores on the surface of the fluid film formation convergence gap, so that each hole is like a micro power sliding bearings. That is, when the other end surface of the porous surface of the slide, the hole will be generated around the top and the fluid dynamic pressure, which is the fluid dynamic pressure effect. Fluid dynamic pressure bearing capacity depends on sliding speed, viscosity of the medium and the fluid film thickness. These holes generate dynamic pressure effect of the joint action of the result that the two sealing surfaces apart.pull tight plastic seals Since the presence of two fluid film between the seal faces, no direct contact with the two sealing surfaces, the sealing surface between the friction state of fluid friction. Experimental studies have shown that, in the face load and speed are the same, porous mechanical seal ring is always greater than the gap between ordinary mechanical seal the gap between the rings. End load increases, the ordinary mechanical seal ring end gap suddenly decreases, so that direct contact with the end face, film destroyed, so wear and tear. For porous face mechanical seal ring, end load increases, the end clearance is reduced, film increased stiffness, and also happens to be a small gap to minimize leakage to meet stringent mechanical seal leakage requirements, while reducing the sealing surface wear. Therefore, the porous mechanical seal can effectively prolong seal life.
Maximum PV value sealing mechanical seal is to evaluate the operational safety an important indicator of the porous mechanical seal mechanical seal can effectively improve the maximum PV value. Face of the porous ratio of hole depth and diameter to optimize the maximum PV value is about ordinary mechanical seals largest PV value of 2.5 times.
Thus, the porous mechanical seal can effectively improve the sealing parameters to ensure the safe operation of the mechanical seal. Porous mechanical seal has been applied to the petrochemical industry, stainless steel wire ties such as light hydrocarbons and toluene sealing medium at a temperature of 266 ~ 320 ℃, pressure 0.67MPa porous mechanical seal. After six months of actual operation, a satisfactory sealing effect.