Mixing devices for selective catalytic reduction fluid generators

A mixing device for a selective catalytic reduction fluid generator, comprising:

• a mixing cylinder having a mixing chamber, wherein an air outlet channel is formed on a right end surface of the mixing cylinder, and an air inlet channel is formed on a left end surface of the mixing cylinder;
• a first material pipe extending into the mixing cylinder, the first material pipe and the mixing cylinder being coaxially arranged, wherein a plurality of first through-holes are provided on the first material pipe at intervals along an axial direction of the first material pipe, and a scraper is fixed on the first material pipe, the scraper being located in the mixing chamber of the mixing cylinder and in contact with an inner wall of the mixing chamber of the mixing cylinder;
• a second material pipe extending into the mixing cylinder, the second material pipe being sleeved on the first material pipe, wherein a plurality of second through-holes are provided on the second material pipe at intervals along an axial direction of the second material pipe, and in a plane of rotation, each of the plurality of first through-holes corresponds to one of the plurality of second through-holes, such that when the plurality of first through-holes and the plurality of second through-holes are aligned, a pipe lumen of the first material pipe is in fluid communication with the mixing chamber of the mixing cylinder;
• and mixing blades are installed on the second material pipe;
• a driving assembly for providing power for rotation of the scraper and the mixing blades, wherein an output end of the driving assembly is drivingly connected to the first material pipe and the second material pipe to drive the first material pipe and the second material pipe to rotate at different speeds;
• and
• a purification mechanism for removing impurities in a fluid, the purification mechanism being disposed in the air outlet channel.