Sand prevention device for outdoor security system camera lens

The invention relates to a sand prevention device for an outdoor security system camera lens, and is characterized by consisting of a waterproof brushless high-speed motor (1), a motor fixture (2), a fan blade flange disc (3), a fan blade (4), a protective cover (5) and a shell (6). The position connection relationships of the six parts are as follows: the waterproof brushless high-speed motor (1) is located by a motor lower fixture (7) and a motor upper fixture (8) in the motor fixture (2), namely the motor (1) is fixed by a motor mounting screw (15) via an upper fixture mounting hole (21) and a lower fixture mounting hole (14), and then the motor (1) is fixed on the shell (6) via a fixture mounting screw (40); the fan blade flange disc (3) is fixed on a motor shaft (10) via a jack screw (16); the fan blade comprises three blades, and all the blades are fixed on the fan blade flange disc (3) by rivets (17) via fan blade mounting holes (18); the protective cover is fixed at a shell protective cover mounting hole (20) on the outer side of the shell (6) via a protective cover mounting screw (35).