The Overall Mechanical Seal With The Heat Difference
Sealing face width of the need to consider what factors
?
mechanical seals are generally first determine the width of the width of the soft surface, hard surface width of self goes without saying. Leakage has little to do with the face width. However, the friction heat generated is narrower is better, produce less heat, the temperature gradient is small, thermal deformation too small, wear more evenly; from the narrow perspective of negative force, destruction and increased the likelihood of capsule-shaped. At the same time wide diameter of mechanical seals face is a function of load factor. Therefore, the mechanical seals faces. Sufficient width should be taken into account. Generally speaking, on the general through media mechanical seals widened with the increase in diameter. Ring diameter (mm) ring width (ram) 20, v60 60, ~ 100 100 ~ 200 2 ~ 4 4 ~ 6 5 ~ 7 for the hydrocarbon class media, face width than the width of some of the medium in general: two high-speed machinery close letters, face relatively narrower width, or too much heat and can not operate normally, usually around 3mm.
Integral sealing ring What kind?
This mechanical seals ring by using the same material, the material properties of the various parts in the sealing ring uniform, there is no separation of combined seal ring leakage and defects, there is no possibility of electrochemical corrosion. Most of soft graphite ring, making hard ring available a variety of alloy steel, such as bearing steel (GCr9), high speed steel (w18 cr4V) and other alloy steel (such as 40Cr, 3Crl3, etc.), and some cast iron alloy (such as silicon, chromium and nickel cast iron). When using these materials must be complemented by appropriate heat treatment to improve its hardness and wear resistance. Low prices of such materials, if used properly, but also a longer life. To further improve the hardness and extended service life, can be used carbide manufacturing. Commonly used for the Co-WC cemented carbide, sexual can be better, but the price is high. The lower the price of steel bonded carbide. In order to improve the corrosion resistance in corrosive media, there has nickel, tungsten carbide, and Hastelloy higher corrosion resistance, but the high price of public funds. In addition, silicon carbide and other ceramic materials with manufacture of the sealing ring.
Thermal structure of the sealing ring mounted what?
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 (Figure 23). This combination mechanical seals ring will 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, 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 ), Material physical properties (mainly thermal expansion coefficient) of the difference 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.
mechanical seals degree of deformation and failure of the plane, even worse than the loss of profit, so that connection failures, carbide ring off. Hot-mounted sealing ring there are three structures, Figure 23a is a manufacturer of early production, the structure is relatively simple. However, due to carbide mechanical seal ring and auxiliary contacts, if carbide ring loose, running is a serious supporting ring wear, there will be a lot of leakage. Figure 23b Figure 23a is based on the improvement, support and carbide mechanical seal ring does not contact the above does not exist defects, only cemented carbide ring and a small leak between the Central Block. Carbide ring mechanical seal faces to reduce the uneven deformation of the thermal loading parts seat ring set inside and outside the ring groove (Figure 23c), so that cylindrical carbide ring the contact stress tends to be uniform cylinder to reduce the tungsten carbide ring deformation effect is good.
by: lucy00123
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