Air inlet device for pneumatic dust fall

The air inlet device comprises a connecting pipe, one end of the connecting pipe is fixedly connected with a flange plate, the other end of the connecting pipe is connected with one end of an air inlet connector, two ends in the air inlet connector are communicated, and the other end of the air inlet connector is fixedly connected with a connector seat. A pipe core is inserted into the air inlet connector and is of a Venturi structure, and a one-way valve is installed on the outer wall of the air inlet connector and communicated with the interior of the pipe core. The tube core comprises a first copper core and a second copper core which are in threaded connection, a first through hole penetrating through the two ends is formed in the first copper core, a second through hole penetrating through the two ends is formed in the second copper core, and the first through hole and the second through hole are coaxial. According to the utility model, the structure is simple, the built-in detachable Venturi tube core i