Patent ID: 7815721

Claim:
A gas filtering-buffering device, comprising: at least one gas filtering unit; a gas inlet, the gas to be processed flows into the at least one gas filtering unit from the gas inlet; and a gas outlet, the gas processed by the at least one gas filtering unit is discharged out of the at least one gas filtering unit via the gas outlet, wherein the at least one gas filtering unit comprising: a first gas filtering unit and a second gas filtering unit connected hermetically and in series, wherein the first gas filtering unit including a first gas buffering cavity and a first gas filtering part, and the second gas filtering unit including a second gas buffering cavity and a second gas filtering part, wherein the first and second gas buffering cavities are used for performing buffering function for the gas, and the first and second gas filtering part are used for performing filtering function for the gas, wherein: a first precise filtering layer is provided between the gas inlet and the first gas buffering cavity; and a second precise filtering layer is provided between the gas outlet and the second gas buffering cavity.