Breathing cap for main feed pump of nuclear power plant

Abstract

The invention discloses a breathing cap for a main feed pump of a nuclear power plant. The breathing cap can effectively prevent bearing lubricating oil from leaking outwards from the breathing cap and an oil seal. The breathing cap comprises a locknut, a rubber gasket, a breathing cap upper cover, a filter element and a breathing cap base. The breathing cap upper cover is sleeved on the breathing cap base. The breathing cap upper cover and the breathing cap base are each of a cylindrical structure with one end open. The breathing cap has the advantages that the field use effect is good, and oil leakage at the breathing cap and an oil seal due to blockage of an original breathing cap is remarkably improved. The defect that an originally designed built-in sponge type pump bearing box breathing cap is generally prone to blockage and losing efficacy is overcome, and by means of the stainless steel wire net filter element breathing cap, it can be guaranteed that high-temperature and high-pressure gas is smoothly exhausted, pressure building in a bearing box body is avoided, and then lubricating oil is prevented from leaking from the bearing oil seal. Dirt particles are prevented from entering the bearing box, and oil in the bearing box is kept clean.

Description

technical field [0001] The invention belongs to a breathing cap of a pump equipment bearing box, in particular to a breathing cap used for a main feedwater pump of a nuclear power plant. Background technique [0002] For the front pump and pressure stage pump of Fangjiashan main feed water pump unit, the original breathing cap is designed with a sponge, which is riveted into the shell of the breathing cap. Once the sponge absorbs enough oil, it will cause blockage, hindering the exhalation of oil and gas, resulting in pressure inside the tank. When the air becomes higher, the exhalation is difficult, and the oil mist particles generated directly drop to the outside of the breathing cap, and cause oil leakage at the bearing oil seal, pollute the equipment, and cause fire hazards. Contents of the invention [0003] The object of the present invention is to provide a breathing cap used for the main feedwater pump of a nuclear power plant, which can effectively prevent bearing...

AI Technical Summary

Problems solved by technology

[0002] For the front pump and pressure stage pump of Fangjiashan main feed water pump unit, the original breathing cap is designed with a sponge, which is riveted into the shell of the breathing cap. Once the sponge absorbs enough oil, it will cause blockage, hindering the exhalation of oil and gas, resulting in pressure inside the tank. When the air becomes higher, the exhalation is not smooth, and the generated oil mist particles directly drop to the outside of the breathing cap, and cause oil leakage at the bearing oil seal, pollute the equipment, and cause fire hazards

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