Balance gas cavity type shaft end sealing mechanism and sealing gas adjustment device of compressor

The invention discloses a balance gas cavity type shaft end sealing mechanism and a sealing gas adjustment device of a compressor and the compressor, and belongs to the technical field of compressors. The shaft end sealing mechanism is arranged between an impeller outlet and a gearbox of the compressor and comprises a first sealing section and a second sealing section. A balance gas cavity is formed between the first sealing section and the second sealing section. The inlet end of the balance gas cavity is used for communicating with a gas inlet pipeline, and the outlet end of the balance gas cavity is used for communicating with a discharging pipeline. The adjustment device is used for adjusting the sealing gas in the sealing mechanism. The shaft end sealing gas adjustment device of the compressor comprises a gas source, the gas inlet pipeline, a valve set and the discharging pipeline. The gas source communicates with the inlet end of the balance gas cavity through the gas inlet pipeline. The outlet end of t