Acoustic waveguide tube with planar structure

The invention discloses a plane structure acoustic waveguide tube, and relates to the technical field of acoustic waveguide tubes, the plane structure acoustic waveguide tube comprises a front plate, a middle plate, a rear plate, a sound throat inlet hole and a spure spreader, the front plate is arranged on one side of the middle plate, the edge of the front plate is tightly attached to the middle plate, the rear plate is arranged on the other side of the middle plate, the rear plate is tightly attached to the surface of the other side of the middle plate, and the spure spreader is arranged in the middle plate. The front plate and the rear plate are connected through the bolt, one end of the bolt is in threaded connection with the front plate, and the waveguide tube formed by the front plate, the middle plate and the rear plate is small in size and does not occupy space; the bamboo-hat-shaped sound spure spreader is adopted, so that sound can uniformly flow through a parabolic route to reach the long-strip-sh