Refrigerating and freezing device

A refrigerating and freezing device, comprising:

• a cabinet body in which a storage compartment is provided, a first sealed space and a second sealed space being formed in the storage compartment;
• and
• a nitrogen generation device comprising an adsorption device and an air compressor, wherein the air compressor supplies compressed air for the adsorption device in a controlled manner, the adsorption device is communicated with the first sealed space or the second sealed space in a controlled manner, and the nitrogen generation device is configured to:
• supply the compressed air for the adsorption device, communicate the adsorption device with the first sealed space so as to enable the adsorption device to prepare nitrogen and to provide the prepared nitrogen for the first sealed space;
• and
• communicate the adsorption device with the second sealed space after stopping supplying the compressed air for the adsorption device so as to enable the adsorption device to desorb an oxygen-enriched gas and to provide the desorbed oxygen-enriched gas for the second sealed space,
• wherein the adsorption device further comprises:
• a first barrel in which a first adsorption room and a nitrogen room that are isolated from each other are provided, and the nitrogen room being communicated with the first sealed space;
• and
• a second barrel in which a second adsorption room and an air room that are isolated from each other are provided, wherein:
• the air compressor is communicated with the air room through an air inlet pipe so as to supply the compressed air for the air room in a controlled manner;
• carbon molecular sieves are disposed in the first adsorption room and the second adsorption room;
• the air room alternately supplies the compressed air for the first adsorption room and the second adsorption room in a controlled manner;
• when one of the first adsorption room and the second adsorption room adsorbs the oxygen-enriched gas to prepare nitrogen, the other thereof desorbs the carbon molecular sieves which have finished adsorption;
• the adsorption room that prepares the nitrogen is communicated with the nitrogen room;
• and the adsorption room that performs desorption is communicated with the second sealed space.