How to solve the problem of self-priming sewage pump mechanical seal leakage?

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how to solve the problem of self-priming sewage pump mechanical seal leakage? Self-priming sewage pump mechanical seal leakage problem solving methods: 1, the mechanical seal leakage of the first possibility is dynamic and static ring sealing surface wear. Machine caused by dynamic and static ring sealing surface wear reasons of six aspects: 2, installation is too tight. Observing the mechanical seal ring plane, such as severe burning phenomenon, flat black and deep traces, sealing rubber harden and loss of elasticity, the phenomenon is caused by installation too tight. The solution: adjust the installation height, the impeller is installed, with screwdriver out spring, spring has the strong tension, loosen after reset, there are 2 - 4 mm distance moved. 3, installation is too loose. Observe the machine moving and static ring sealing surface, the surface has a very thin layer of scale, can wipe, basic no wear surface, which is caused, poor lose elasticity and spring assembly or motor axial channeling move. 4, poor water quality containing particles. Due to poor water quality, contains small particles and hydrochloride content in medium high, in the shape of abrasive wear machine sealing plane or strain the phenomenon such as surface groove, ring groove. The solution: to improve the hydraulic or medium, more replacement closure. 5, dry grinding damage caused by the water running. This phenomenon found in the bottom valve type installation forms inlet negative pressure, there is air inlet pipe, inside the pump chamber, air pump after startup, friction generated when the high-speed operation of high temperature by the machine and to cool, check machine, spring tension is normal, the friction surface burning black, rubber harden craze. The solution: although way and the air inside the water pump cavity, replacement of mechanical seal. 6, cavitation. Cavitation erosion is mainly produced in heat pumps. Since the medium is hot water, the water temperature is too high to produce steam pipe of the gas entering the water pump cavity, this section of the vapour cannot be ruled out, resulting in lack of operation, machine sealing failure, dry grinding cavitation automatic exhaust valve, a replacement.

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