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water Pump mechanical seal is a widely used rotary shaft dynamic seal, also known as end face seal. In recent decades, mechanical sealing technology has made great progress and has been widely used in industries such as petroleum, chemical industry, light industry, metallurgy, machinery, aviation and atomic energy. According to the statistics of my country's contemporary petrochemical industry, 80%-90% of centrifugal pumps have adopted mechanical seals.
The mechanical seal is defined according to relevant standards as: a device that prevents fluid leakage by keeping a few pairs of end faces perpendicular to the rotation axis under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism and the cooperation of the auxiliary seal to keep fit and relatively slide.
The mechanical seal is an important seal in the pump. It is installed at the connection point between the motor and the pump body to ensure that the medium does not leak during the operation of the pump. The mechanical seal is also a wearing part of the pump. If the mechanical seal is damaged, it will not only reduce the use of the pump. efficiency, and more damage to the pump over time. Therefore, in the daily use of the water pump, the mechanical seal must be properly maintained so that it has a better sealing effect and a long service life. So how to prevent mechanical seal damage? Pay attention to the following aspects when overhauling the mechanical seal of the water pump.
1.Avoid leakage due to loose parts, and pay attention to the heating phenomenon caused by impurities entering the end face and whether there is any abnormal noise during operation. For pumps that run continuously, more attention should be paid to preventing dry friction during operation. Do not allow the pump to evacuate, if necessary, set an automatic device to prevent the pump from evacuating. For pumps running intermittently, attention should be paid to the crystals formed due to drying of the material after the pump is stopped, or the crystals precipitated by cooling, and heating or flushing measures should be taken when the pump is started to prevent the crystals from scratching the end face and affecting the sealing effect.
2.Whether the circulating protection systems and instruments such as flushing and cooling work normally and stably. It is necessary to pay attention to the failure of cooling due to sudden water stoppage, resulting in seal failure, or accidents due to blockage of cooling pipes, flushing pipes, and pressure equalizing pipes.
3.Factors such as vibration and heat generation of the centrifugal pump itself will also affect the sealing performance, which must be observed frequently. When the bearing part is damaged, it will also affect the sealing performance, so pay attention to whether the bearing is hot and whether the sound is abnormal during operation, so that it can be repaired in time.
