FIELD: engines and pumps.
SUBSTANCE: invention relates to oil-free screw compressors. Compressor 10 has main part 11, oil feed tank 13, oil feed line 60 and oil return line 59. Besides, has shaft seals 28, 41 fitted on opposite sides of compression chamber 24 of screw rotor 25 in direction of shafts 26, 38 to prevent leaks of oil from bearings 27, 39, to into compression chamber 24 and those of process gas from compression chamber 24 via return line 52 for suction hole, shaft seals 41 to be jointed together on compression chamber pressure side and suction hole 17 of said main part 11, communication line 61 for fed process gas to communicate suction hole 17 with top section of tank 13, and shaft seal 53 to separate main part inside and atmosphere.
EFFECT: compressor with cheap and reliable seals.
3 cl, 5 dwg
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