Carbon dioxide compressor capable of recycling leaked gas

The utility model discloses a carbon dioxide compressor capable of recycling leaked gas, which belongs to the technical field of centrifugal compressor gas seals and comprises a volute. The impeller is positioned in the volute; a driving shaft is connected and penetrates through the volute; a first sealing piece and a second sealing piece are sequentially arranged between the volute and the driving shaft in the axial direction of the driving shaft. A first gap is formed between the first sealing element and the second sealing element; the collecting pipeline penetrates through the volute and is communicated with the first gap; a first sealing piece and a second sealing piece are arranged between a volute and a driving shaft, and a first gap is formed between the first sealing piece and the second sealing piece; when the compressor runs, a small amount of high-pressure medium gas in the volute leaks into the first gap through the gap between the first sealing piece and the driving shaft under the action of pre