According to the first aspect of the invention, a kind of spraying device, for generating aerosol. Injection apparatus includes reservoir for accommodating many liquid; Conveying chamber includes that one liquid is got before reservoir discharge; Punch unit includes one or more nozzles; Driving mechanism, for driving liquid to pass through one or more nozzles from discharge room; And flow measurement system. Flow measurement system includes driving valve, can be in closed position and open position. The control valve of opening and closing can sort, with control fluid from reservoir to discharge room.
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