Patent ID: 8434701

Claim:
A device for intermittently jetting gas, comprising: a gas source; a nozzle; a gas conduit with a first end in communication with the gas source and a second end being in communication with the nozzle; a rotary disc; and a motor having a shaft, said rotary disc being mounted on the shaft of the motor for rotating along with the shaft of the motor, said rotary disc having at least one opening through which a gas in the gas conduit can be jetted from the nozzle when the at least one opening is aligned with the nozzle, wherein said rotary disc and said motor are internally disposed; said rotary disc and said motor are received within a sealing device; said rotary disc divides an internal space of the sealing device into a left space and a right space which are communicated with each other via the at least one opening in the rotary disc; an outlet of the gas conduit is communicated with a side of the sealing device, and the nozzle is mounted on another side of the sealing device; when the nozzle is aligned with the at least one opening of the rotary disc, a gas with a first pressure is jetted from the nozzle; and when the nozzle is misaligned with the at least one opening of the rotary disc, a gas, having a second pressure different from the first pressure, is jetted from the nozzle.