Diesel engine respirator

A diesel engine respirator comprises a diesel engine air inlet pipe, a crankcase and a connecting pipe. The connecting pipe is divided into two sections, namely a connecting pipe A and a connecting pipe B; the upper end of the connecting pipe A is communicated with the gas inlet pipe, and the lower end is communicated with a gas outlet of the oil-gas condensing device; 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 the lower end is communicated with the crankcase; 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, and after the oil gas is condensed through the oil gas condensing device, on one hand, the maximum oil gas amount capable of being contained in gas is reduced when hot oil gas is cooled, and on the other hand, the kinetic energy