EGR (Exhaust Gas Recirculation) cooler with degassing anti-backflow structure and engine

The EGR cooler comprises a cooler body, the cooler body comprises a shell and further comprises a degassing pipe, one end of the degassing pipe is communicated with the interior of the shell, the other end of the degassing pipe is communicated with an expansion water tank, a one-way valve is arranged on the degassing pipe, and the other end of the degassing pipe is communicated with the expansion water tank. The one-way valve is used for controlling cooling liquid and gas to flow to the expansion water tank only from the cooler. Due to the fact that the one-way valve is additionally arranged on the EGR cooler, the one-way valve is opened normally, gas enters the expansion water tank, the overheating risk of the cooler is reduced, and the reliability of the cooler is improved. Under partial transient working conditions, the pressure of the cooler side is smaller than that of the expansion water tank side, so that the one-way valve is closed, gas in the expansion water tank is prevented from entering the EGR co