Air separation device

The utility model provides an air separation device which comprises a low-temperature device, a high-temperature device and a high-temperature device, the blowing and defrosting mechanism comprises an air supply part and an annular defrosting part which are connected with each other, the air supply part is internally provided with heating air, the air supply part is communicated with the annular defrosting part so as to provide the heating air for the annular defrosting part, the annular defrosting part is arranged around the executing mechanism, and the annular defrosting part blows the heating air towards the peripheral surface of the executing mechanism. By the adoption of the scheme, defrosting of the peripheral face of the executing mechanism is achieved through the annular defrosting part, the situation that low-temperature equipment of the air separation device fails or is damaged due to frosting caused by cold air leakage in part of the peripheral face of the executing mechanism is avoided, and reliab