Oil returning gas removal device and lubricating oil system

Abstract

The invention discloses an oil returning gas removal device and a lubricating oil system, and relates to the technical field of power devices. The oil returning gas removal device is arranged in an oil tank of the lubricating oil system and comprises a connecting part, an oil returning pipe assembly, a sleeve and a filter assembly; the connecting part is used for mounting the oil returning gas removal device in an oil returning hole in the inner wall of the oil tank, the inlet end of the oil returning pipe assembly is connected with the connecting part, the sleeve is arranged at the outlet endof the oil returning pipe assembly, the sleeve and the oil returning pipe assembly form a continuous pipeline, multiple oil passing holes are formed in the periphery of the wall of the sleeve, the filter assembly is detachably arranged on the circumferential outer side and the bottom of the sleeve, and the filter assembly is provided with a filter net with the hole diameter smaller than 0.3 mm. Oil returning turning over and bubbles generated by traditional gravity oil returning can be avoided, the filter net of the filter assembly can effectively separate bubbles with the diameter above 0.3mm in the oil returning process, the gas containing amount in lubricating oil can be effectively reduced, the lubricating effect of the lubricating oil is ensured, and cavitation noise caused by gas containing of the lubricating oil can be reduced.

Description

technical field [0001] The invention relates to the technical field of power devices, in particular to an oil return and degassing device and a lubricating oil system. Background technique [0002] The lubricating oil system of the steam turbine and the reducer is connected to the atmosphere, and the oil return will bring the gas into the oil tank of the lubricating oil system. The diameter of these bubbles is mainly distributed between 0.3 and 0.5mm. Due to the small diameter of the bubbles, it is difficult for the bubbles to float up to the surface of the fuel tank by their own buoyancy to gather and remove them. In addition, the circulation rate of the fuel tank is limited, which makes these tiny bubbles very difficult. It quickly spreads to all corners of the fuel tank, making it more difficult to remove. Under normal circumstances, after long-term operation, the air content of the lubricating oil in the lubricating oil system of the steam turbine and the reducer is abo...

AI Technical Summary

Problems solved by technology

The diameters of these bubbles are mainly distributed between 0.3 and 0.5 mm. Due to the small diameter of the bubbles, it is difficult for the bubbles to float up to the surface of the fuel tank through their own buoyancy to collect and remove them. In addition, the circulation rate of the fuel tank is limited, so these tiny bubbles are very difficult. Quickly spreads to all corners of the tank, making it more difficult to remove

Under normal circumstances, after a long period of operation, the air content of the lubricating oil in the lubricating oil system of the steam turbine and reducer is about 8-10%. These air bubbles seriously affect the normal operation of the lubricating oil system, resulting in the following adverse consequences: (1) The delivery capacity of lubricating oil is reduced, which greatly reduces the cooling and lubricating effect

As a result, problems such as instability of the bearing oil film, excessive temperature of the bearing bush, or damage to the tooth surface of the reducer may be caused; (2) When the air bubbles enter the high-pressure area through the lubricating oil pump with the lubricating oil, the air bubbles are instantly crushed to generate cavitation noise, This kind of irregular noise spectrum has broadband characteristics, and its energy can excite the natural vibration of movable parts in pumps, valves or pipelines, resulting in abnormal vibration and noise of the system

At present, there are no effective degassing and defoaming measures for the lubricating oil system of steam turbines and reducers

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