Cable pit ventilation dampproof device

Cable pit ventilation dampproof device, including frame and frequency conversion air exhauster, be equipped with inverter motor and outer tube in the frame, the outer tube internal rotation is connected with an interior sleeve pipe, interior sleeve pipe rear end is connected with inverter motor's power take off end transmission, the outer tube front end is equipped with preceding crown plate, wear -resisting sealing washer before preceding crown plate inner circle is equipped with, be equipped with the posterior annulus board in the outer tube, posterior annulus inboard circle is equipped with the wear -resisting sealing washer in back, be equipped with the ventilative hole between the wear -resisting sealing washer of wear -resisting sealing washer and back before lieing in on the interior sleeve pipe, the outer tube outer wall passes through the coupling and the guide duct is connected with the frequency conversion air exhauster, interior sleeve pipe front end is connected with the air -supply line through