Non-active pressure-boosting pressure-stabilizing system capable of alleviating cavitation abrasion of water lubricated main-pump bearing

The invention relates to a non-active pressure-boosting pressure-stabilizing system capable of alleviating cavitation abrasion of a water lubricated main-pump bearing. According to the system, a conventional openmouthed main pump head box is changed into a sealed head box, also two electric stop valves are additionally installed on an exhaust overflow pipe, and an exhaust valve is additionally installed at the upper part of the head box. Because of a pressure stabilizing system consisting of a throttling member, an inverted valve and a pressure-stabilizing tank, the influence of pressure fluctuation of a desalted water supply system to the head box is buffered; an inflation system of the pressure-stabilizing tank is formed by utilizing a conventional nitrogen low-pressure system and additionally installing a manual stop valve used for adjusting nitrogen pressure and a manual stop valve used for closing and stopping nitrogen supply; by opening the electric stop valve in parallel connection with the inverted valve and opening the exhaust valve at the exhaust overflow pipe of the main pump head box and closing the electric stop valve at the inlet pipe of the pressure-stabilizing tank, the connection between changed return part and the original system is rapidly cut off; and by opening the manual stop valve used for closing and stopping nitrogen supply and at an air inflation pipe of the pressure-stabilizing tank, air can be supplied when a reactor is operated.