Venturi mixer with insert pipe

The utility model discloses a venturi mixer with an insert pipe, and the venturi mixer is mainly applied to gas-liquid mixing. The venturi mixer comprises a main stream venturi pipe inflowing pipeline, a main stream venturi pipe gradual shrinking section, a main stream venturi pipe throat part, a main stream venturi pipe diffusing section and a main stream venturi pipe outflowing pipeline, and also comprises the special insert pipe communicated with the main stream venturi pipe throat part, wherein the main stream venturi pipe inflowing pipeline, the main stream venturi pipe gradual shrinking section, the main stream venturi pipe throat part, the main stream venturi pipe diffusing section and the main stream venturi pipe outflowing pipeline are successively communicated, the inner wall of the special insert pipe is composed of an inlet section arranged on the outer end, a small throat part arranged on the inner end, and a gradual shrinking section connected with the inlet section and the small throat part; the outer wall of the special insert pipe is provided with a thread, the turbulent flow action of a flowing body is enhanced, the inserting depth of the special insert pipe is adjustable, and a defect that the spraying distance of gas in liquid is small is effectively offset; and meanwhile, the gas is introduced in the small throat part of the special insert pipe and suddenly diffuse, the flow speed of the introduced gas is effectively accelerated, the mixing efficiency of the venturi mixer effectively is improved, the venturi mixer is suitable for flow matching of the introduced gas and main stream fluid within a large range, and the range of application of the venturi mixer is expanded.