▎ 摘　　要

NOVELTY - The mask has two air pumps whose output ends are connected with a Laval pipe (3). The two Laval pipes are connected together with an air knife (7). A lower unit of the air knife is provided with a guide air nozzle for discharging air. An inner unit of an elastic clamp (4) is provided on an inner side of the elastic clamp. The elastic clamp is used for clamping with a cap brim of a hat. The air flow input by the air pump is connected with the air curtain to form an air curtain through the guide gas nozzle and the air nozzle through the rawal pipe and the accelerating knife. An air curtain and a human face clearance fit, where inlet radius of the Laval tube is 3 mm. The throat radius is 1.2 mm. An input end of the air pump is provided with a detachable graphene filter film. An inner side of the elastic clamp is provided with a power supply module. USE - Cap-type air curtain mask for filtering air inlet nose to stop harmful gas, smell, foam, virus and gauze or paper. Can also be used as air filter mask and air supply mask. ADVANTAGE - The clean air flow output by the Laval pipe and the super air knife to the air pump is accelerating for forming the air curtain under the guide air nozzle, the external harmful gas and dust are isolated, ensuring the safety of the user and ensuring the smooth breath, reducing the uncomfortable feeling of wearing. The thin film solar assembly and the lithium battery are matched to realize the convenient energy supply of the device, it is convenient to carry, it ensures the durability. The air quality sensor is electrically connected with the air pumps to sense the air quality, so as to conveniently control the flow rate of air pump, realizing the real-time control of air flow rate. DESCRIPTION OF DRAWING(S) - The drawing shows an isometric view of the cap-type air curtain mask. Air pump (1) Connecting pipe (2) Laval tube (3) Elastic clamp (4) Rubber magnet (5) Slot (6) Air knife (7) Thin film solar module (8) Lithium battery (9) Air quality sensor (10)