Urea solution injection device integrated with mixer

A urea solution injection device comprising:

• an exhaust pipe for discharging exhaust gas generated in a combustion chamber to an exterior;
• an injector disposed in the exhaust pipe that pierces the exhaust pipe to inject urea solution into the exhaust gas flowing in the exhaust pipe;
• a catalyst disposed at a position after the injector when viewed in a flow direction of the exhaust gas to decompose the exhaust gas mixed with the urea solution;
• and
• a urea solution mixer disposed at a first end of the injector and installed within the exhaust pipe and pierces the exhaust pipe to inject and disperse the urea solution from the injector,
• wherein the urea solution mixer comprises a connection member formed in a pipe shape, of which both ends are opened and a first end is inserted around an outer peripheral surface of a lower end of the injector, and a mixer member coupled to a second end of the connection member to scatter the urea solution injected from the injector,
• wherein the mixer member comprises a ring member inserted around and coupled to an edge of an opening at the second end of the connection member and having an aperture formed at a center thereof, and a urea solution dispersion member composed of a plurality of fin members, wherein each of the fin members being arranged to form a fan shape with its adjacent fin member in a manner that a first end of the fin members are adjacent to the center of the aperture and a second end of the fin members are spaced apart from each other at an interval of a predetermined angle and adjacent to an edge of the aperture having a plurality of dispersion apertures for dispersing the urea solution, and
• wherein the urea solution mixer further comprises a urea solution guide member coupled to an interior of the connection member to guide the urea solution injected from the injector to the urea solution dispersion member, wherein an interior peripheral surface of the urea solution guide member has a groove of a projection-shaped spiral portion that guides the urea solution injected from the injector in a shape of swirl.