Hot oil pump shutdown is mainly caused by the failure of the mechanical seal. Mainly due to failure of the performance of the leak, there are several reasons for leakage: static and dynamic ring seal surface leakage, mainly due to: face flatness, roughness does not meet the requirements, or scratch the surface; between the end of the particulate matter, resulting in the two ends Can not run the same; installation is not in place, the way is not correct. Compensation ring ring leakage, mainly due to: gland deformation, uneven pre-tightening; installation is not correct; seal quality does not meet the standards; seal selection wrong. The actual use of the results show that the sealing element failure is the most dynamic parts of the static and static ring end, hot oil pump machine seal, static ring end face cracking is a common phenomenon of failure, the main reasons are: installation of sealing surface clearance is too large, flushing Liquid too late to take away the heat generated by the friction; rinse liquid leak from the gap in the sealing surface, resulting in overheating and damage. Liquid medium vaporization expansion, so that both ends of the expansion by the vaporization and separation, when the two sealing surface force fit, the destruction of the lubricating film resulting in the end surface overheating. Liquid medium lubrication is poor, combined with the operating pressure overload, the two sealing surface tracking rotation is not synchronized. For example, high-speed pump speed of 20445r / min, when there is a sealing surface can not track the hysteresis rotation, instantaneous sealing surface damage caused by high temperature. Seal flushing fluid orifice plate or filter blockage, resulting in insufficient water, the machine seal failure. In addition, the sealing surface of the surface of the sliding groove, the end face of the gap caused by seal failure, the main reasons: the liquid medium is not clean, there are tiny hard particles, with a very high speed sliding sealing surface, the end surface scratches And failure. The coaxiality of the transmission parts of the pump is poor. After the pump is turned on, the end surface is wobbled and rubbed once per revolution, and the running track of the moving ring is not in the same heart, causing the end surface to vaporize and overheat and wear. The frequent occurrence of the hydraulic characteristics of the liquid medium causes the pump group to vibrate, resulting in the dislocation of the sealing surface and failure. Liquid medium on the sealing element corrosion, stress concentration, with hard and soft materials, erosion, auxiliary seal ring, ring, concave ring and the liquid medium incompatible, deformation and so on will cause mechanical seal surface damage failure, so its Damage to a comprehensive analysis of the form, identify the root causes, to ensure long-term mechanical seal operation.
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