Device for preventing oil station from discharging oil mist

The invention relates to the technical field of lubricating oil stations, in particular to a device for preventing an oil station from discharging oil mist. An external discharge prevention assembly comprises a connecting plate fixed outside an oil station, a shell fixed in the oil station and dividing the oil station into a first cavity and a second cavity which are arranged up and down, an air bag fixed with the connecting plate and located in the first cavity, and a cooling air inlet pipe and a cooling air outlet pipe which are communicated with the air bag; when equipment runs, generated oil mist enables the pressure in the oil station to rise, the air bag shrinks under the action of the pressure, the oil mist enters the shell through the oil mist inlet in the side edge of the shell, and pressure balance in the oil station is achieved. The temperature of cooling gas introduced into the air bag through the cooling gas inlet pipe is far lower than the temperature of the oil mist, so that the oil mist in con