Boiler pump motor having one-way sealing property stuffing box

Abstract

The invention relates to a boiler pump motor having a one-way sealing property stuffing box, which comprises a motor and a boiler pump. The motor comprises a sealing container, a stator, a rotor and a shaft, wherein an external extending end of the shaft is connected to the boiler pump; a hot neck is at the joint between the motor and the boiler pump; the shaft at the hot neck is shaft extension part; the shaft at the shaft extension part is sleeved on more than two abnormal sealing rings; and a groove is arranged on the external axial end face of each abnormal sealing ring. The inner ring of the abnormal sealing ring of the invention and the external ring at the shaft extension part form a sealing clearance which is filled with water so as to form an additional water lubrication bearing, shorten the hanging arm length of the traditional hanging arm into 1/4 to 1/6, decrease the deflection to 1/64 to 1/216, promote the rotating speed for 30 to 50%, and efficiently prevent the shaft from bending and avoid the premature failure of the pump bearing. The leakage quantity of fault leakage is reduced to 1/10. High-temperature boiler water almost can be automatically prevented from entering in the motor so as to prevent the accident caused by burning the motor winding insulator.

Description

technical field [0001] The invention belongs to the technical field of a driving motor for a boiler boiler water circulation pump of a large steam turbine generator set, and in particular relates to a boiler water pump motor. Background technique [0002] The furnace water pump motor is the driving equipment used to drive the forced circulation pump in large power plants. The inlet and outlet pipes of the forced circulation pump are connected to the pipeline system of the boiler to provide power for the boiler working medium circulation, and to reduce fuel consumption and improve power generation efficiency. Boiler The parameters of the working fluid have reached the so-called ultra-supercritical parameter boiler-steam turbine system with a pressure of 30MPa and a temperature above 300°C. The furnace water pump motor is directly connected to the forced circulation pump. In the early stage of the development of the furnace water pump motor from the 1950s to the 1960s, there w...

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Problems solved by technology

[0005] In order to solve the problem of premature failure of the guide bearing at the pump end of the boiler water pump motor, the easy bending of the shaft extension, and the sealing problem, the present invention provides a boiler stuffing box with one-way sealing performance without changing the structure of the existing boiler water pump motor. water pump motor

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