The problem of oil leakage from the bearing box of the feed pump motor in domestic thermal power plants is widespread. The causes can be roughly divided into two types: poor sealing of the motor oil shield or damage to the oil shield after prolonged operation; Due to poor casting technology, the original cast bearing box had casting defects such as sand holes, air holes, cracks, and shrinkage porosity, which caused leakage after long-term operation.

After a long time of operation, the motor bearing box of the electric feed pump of the 8 # and 9 # units in a power plant presented the appearance of oil leakage, resulting in severe loss of turbine oil. Repeated oil replenishment has affected the output of the feed pump, and the environment has also suffered a certain degree of pollution.

Based on extensive research and consulting many relevant materials, this plan is formulated by contacting the actual situation on site. The HT series products produced by Huitian Rubber Industry in China are selected for leakage coating treatment. Due to leakage caused by casting defects, it is generally difficult to identify the location of leakage, so all internal and external surfaces are coated with anti leakage coatings to completely eliminate leakage.

The operation process is as follows: First, clean the inner and outer surfaces of the bearing seat of the bearing retainer manufacturer, clean them, and dry them in the sun. Then, soak the inner cavity of the bearing seat with special impregnation glue. After the impregnation glue has filled and solidified the casting defects such as cracks and micro cracks, use corrosion resistant repair agent for outer anti-corrosion and leakage prevention treatment.

The detailed operation method is as follows. First, clean the oil slick on the surface with high-efficiency cleaning agent HT755, and then remove the paint on the surface with scraper HT790. Use an acetylene flame to remove oil stains from dead corners and cracks. Grind with abrasive cloth, wire brush, etc. until the casting body is clean and dry.

The life of the upper bearing is longer than that of the lower bearing, and the lower bearing is cracked, causing the electric pump to fail to operate; The direct and primary reason for the rapid failure of the lower bearing is that the lower bearing and the bearing cavity are filled with coal cinders, sand particles, and water; The coal cinders, sand particles, and water in the lower bearing and bearing cavity come from the motor cavity, while the coal cinders, sand particles, and water in the motor cavity come from the operating water, due to the wear and failure of the skeleton oil seals 5, 10, and 14.