Compressor and design method of compressor

The embodiment of the invention discloses a compressor and a design method of the compressor, the compressor provided by the embodiment of the invention comprises a compressor main body, a gas taking assembly and a sealing interstage, the compressor main body comprises a plurality of impellers, and the multiple impellers are arranged at an air outlet of the compressor main body in a multi-stage series connection mode; the gas taking end of the gas taking assembly is arranged between the two adjacent stages of impellers, and the gas taking assembly comprises a flow guide pipe; the sealing interstage is arranged at the shaft end of the last-stage impeller of the compressor main body, and the sealing interstage is communicated with the air outlet end of the flow guide pipe; according to the technical scheme, the temperature and the pressure of the sealing gas are reduced, and on the premise that better high-temperature-resistant and high-pressure-resistant dry gas sealing materials do not need to be adopted, the