subject: Heat Sealing Ring Mounted Sealing Ring Structure And The Characteristics Of Modular Description [print this page] Hot-mounted Mechanical seals ring structure is like?
To improve the O-ring Mechanical seals ring with the use of temperature, there has been heat-mounted sealing ring. It is by carbide ring and ring interference fit between the seat to transfer torque and achieve sealing, is the most widely used as a sealing ring. This combination will ring Mechanical seals ring seat heating, Central heating swell seat hole, into the cemented carbide ring, and cooling to complete the interference between the two in combination, and then at room temperature, grinding and polishing Mechanical seals faces to the required accuracy. The drawbacks of this ring, as time goes by, the environment and the use of temperature degree of change, Mechanical seals faces of the plane will not meet the requirements change. The reason, one hot charging structure inherent interference, and the uneven contact stress, thus producing mechanical deformation; Second, the use of high temperature (or low), materials Differences in physical properties to carbide ring and ring seat location can not be synchronized with the expansion and contraction, the amount of interference change, contact stress. Also with the changes, such changes affect the use of sealing rings. Seals degree of deformation and failure of the plane, what is more, the loss of interference, so that connection failures, carbide ring off. Heat sealing ring mounted there are two structures, the first is the early production factory, the structure is relatively simple. However, due to carbide Mechanical seals ring and the auxiliary contact, once the hard quality alloy ring loose, running is a serious supporting ring wear, there will be a lot of leakage. The second is based on the first improvement, support and carbide ring engagement ring does not, there is no such defects, but carbide ring and ring seat slight leakage between. Carbide ring Mechanical seals faces to reduce the uneven deformation of the thermal loading parts seat ring set inside and outside the ring tank, cylinder cylindrical carbide ring contact stress tends to be uniform in order to reduce the deformation of tungsten carbide ring, using results better.
Combined welding sealing ring which features?
To overcome the heat Mechanical seals ring loose equipment defects, there has been welding the sealing ring. Carbide is used in cr, c2, Ni-based. Corrosion resistance superior to YG6 carbide, high temperature, excellent oxidation resistance, heating the air at 1000 ""? 2 hours without any change. However, poor thermal conductivity, only YC. 6 1 / 3; linear expansion coefficient than the large one times YG6 for 10.2 10_8 / ""? (10 ~ 500 ""? pm). These two points determine the thermal shock resistance than YG6 good. Because of line expansion expansion coefficient larger, and martensitic stainless steel close to the Central Block, and provide favorable conditions for welding. Welding between the seat ring and be laying in a layer of nickel powder, placed in a vacuum resistance furnace, at 1100 ""? high temperature welding, and then tempered to eliminate in addition to welding stress. As the welding of the Mechanical seals ring, carbide ring thickness can be thinner than YG6, blank thickness of only 3 ~ 3.5mm. But does not produce transmission failure.
