EGR mixing and adjusting apparatus and internal combustion engine

An EGR mixing and adjusting device, comprising an EGR pipe internally provided with an EGR mixing chamber, wherein an exhaust gas inlet channel in communication with the EGR mixing chamber is provided on a side wall of the EGR pipe;

• and
• wherein a gas guide sliding block for blocking or opening the exhaust gas inlet channel is slidably provided in the EGR pipe along an axial direction, and the EGR mixing and adjusting device further comprises a driving device for driving the gas guide sliding block to slide to a predetermined opening degree,
• wherein, the gas guide sliding block comprises a gas guide channel communicating the exhaust gas inlet channel with the EGR mixing chamber, and a blocking structure for blocking the exhaust gas inlet channel,
• wherein, the gas guide sliding block is a gas guide cylinder slidably fitting with an inner wall of the EGR pipe, and the gas guide channel and the blocking structure are respectively arranged on cylinder walls at two ends of the gas guide cylinder in an axial direction,
• wherein, a guide vane for guiding an inlet gas in the gas guide channel is provided on the inner wall of the gas guide cylinder, and the guide vane is inclined with respect to a radial direction of the gas guide cylinder and extends inward.