Fire-fighting smoke exhaust ventilation fan with differential pressure alarm structure

The utility model relates to the technical field of fire-fighting fans, in particular to a fire-fighting smoke exhaust ventilation fan with a pressure difference alarm structure. According to the technical scheme, the device comprises an outer cover, a control box and supports, an inner container sleeve is installed in the outer cover, a protective net is installed on one side in the outer cover, two sets of differential pressure switches are installed on the two sides in the outer cover, an installation frame is installed in the outer cover, two sets of supports are installed on the two sides of the bottom of the outer cover, and the control box is installed on the front face of the outer cover; a loudspeaker is installed at the bottom in the control box, and a welding base is installed at the top of the outer cover. According to the utility model, two groups of differential pressure switches are arranged on the two sides inside the outer cover, when the differential pressure is increased along with the incr