Respirator of lifeboat diesel engine

A lifeboat diesel engine respirator comprises a diesel engine crankcase, a connecting pipe B and an oil gas condensing device. The lower end of the connecting pipe B is communicated with the crankcase, the upper end of the connecting pipe B is communicated with a gas inlet and oil return port of the oil-gas condensing device, and a gas outlet in the upper end of the oil-gas condensing device is communicated with space atmosphere; and the oil gas condensing device is a water-cooled heat exchanger and is provided with a cooling water inlet and a cooling water outlet. Oil gas in the crankcase is introduced into the oil gas condensing device through the connecting pipe B, after the oil gas is condensed through the oil gas condensing device, on one hand, the oil gas in the crankcase is cooled, on the other hand, when the hot oil gas is cooled, kinetic energy of the hot oil gas is rapidly reduced, engine oil in the oil gas is separated out, and gas and oil in the oil gas are cooled and separated through the labyrin