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Replacing the horizontal slurry sand mechanical mechanical seal, 85 percent of the seal leakage was not caused by wear, but leaked before it was worn.
When the sealing surface is opened, the solid particles in the medium flow into the sealing surface under the action of liquid pressure. After the sealing surface is closed, these solid slurry particles are embedded in the surface of the soft ring (usually the right ink ring), and the rough particles wear the surface.
Because the moving ring or rubber ring is tightly fastened to the shaft (sleeve), when the shaft is moving in series, the moving ring cannot be fitted with zero time difference, so that the sealing surface is opened and the sealing surface is closed with hysteresis, causing solid particles to enter In the sealing surface.
At the same time, there are solid particles between the shaft (sleeve) and the sliding parts, which affect the sliding of the rubber ring or the moving ring (relative to the dynamic seal point, common failure). In addition, the medium will also produce crystals at the friction between the rubber ring and the shaft (sleeve), and there will also be solid substances in the spring, which will cause the sealing surface to open.
Due to the heat generated on the sealing surface, the temperature of the rubber ring should be lower than the design specification. The service temperature of fluorine rubber and polytetrafluoroethylene is 216℃, and the service temperature of nitrile rubber is 162℃. Although they can withstand higher temperatures, the heat generated by the sealing surface is higher, so the rubber ring continues to vulcanize In the end, it loses its elasticity and leaks. (Consider cold brittleness in the cold zone) The heat between the sealing surfaces will also cause the crystallization of the medium, such as carbon formation, causing the sliding parts to be stuck and the sealing surface to be condensed. Moreover, some polymers are coked due to overheating, and some fluids lose lubrication due to overheating, and even flash fire. In addition to changing the condition of the medium, overheating can also increase its corrosion rate. Cause the deformation of metal parts, cracks on the alloy surface, and some cracks in the coating, the design should select a balanced mechanical seal to reduce the specific pressure to prevent overheating.
The correct assembly tolerances are necessary for the installation of mechanical seals. The shaft (sleeve) must have the proper surface roughness and the correct size, but the manufacturer rarely provides tolerance data, which are critical for installation. of. The dimensional accuracy and form and position tolerances of the mechanical seal must meet the requirements of the drawings, and excessive tolerance will cause the seal to fail prematurely.
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