Abstract: A multi-staged screw compressor system includes a gearbox, a drive gear located in the gearbox, and a first, second and third screw compressor that are fastened to the gearbox and coupled to the drive gear such that the first, second, and third screw compressors are all driven in common by the drive gear. During operation the first screw compressor compresses a flow of gaseous fluid from an inlet pressure to a first intermediate pressure, the second screw compressor compresses the flow of fluid from the first intermediate pressure to a second intermediate pressure, and the third screw compressor compresses the flow of fluid from the second intermediate pressure to a final pressure. The final pressure is at least thirty times the inlet pressure.

Abstract: A multi-staged screw compressor system includes a gearbox, a drive gear located in the gearbox, and a first, second and third screw compressor that are fastened to the gearbox and coupled to the drive gear such that the first, second, and third screw compressors are all driven in common by the drive gear. During operation the first screw compressor compresses a flow of gaseous fluid from an inlet pressure to a first intermediate pressure, the second screw compressor compresses the flow of fluid from the first intermediate pressure to a second intermediate pressure, and the third screw compressor compresses the flow of fluid from the second intermediate pressure to a final pressure. The final pressure is at least thirty times the inlet pressure.

Abstract: The invention relates to a multi step helical screw compressor unit which consists of a drive housing (90), wherein a first, second, and third helical screw compressor (60, 70, 80) are secured in a protruding manner parallel to each other and are driven together by a drive toothed wheel in the drive housing. A gas-like fluid is compressed by the first helical screw compressor (60) at a first intermediate pressure of approximately 3.5 bars, by the second helical screw compressor (70) at a second intermediate pressure of approximately 12 bars and by the third helical screw compressor (80) at an end pressure of approximately 40 bars. The driven toothed wheels (65, 75) of the first and the second helical screw compressors are in contact with the drive toothed wheel (95) above the axes thereof, when the driven toothed wheel (85) of the third helical screw compressor (80) is in contact with the drive toothed wheel (95) in the vicinity of the deepest point thereof (T).

Abstract: A helical screw compressor includes two rotors which are mounted in the rotor housing. The helical screw compressor includes sealing arrangements (11, 11?) for sealing the pressure-sided shaft journals of the rotors. Each sealing arrangement includes a plurality of annular seals (11a, 11b) which are arranged in a row adjacent to each other, and an annular-shaped discharge chamber (51) is associated with the system on an intermediate position and is connected, via a discharge channel (53), to the chamber in the rotor housing, wherein pressure which is higher than the atmospheric pressure. Preferably, the discharge channel is connected to the suction chamber (10) of the rotor housing (1), and is impinged upon by precompressed gas from an upstream compressor step.

Abstract: A screw compressor rotor housing is surrounded by a cooling housing that forms an annular cooling chamber. The cooling chamber is interrupted at one point by a separating wall that connects the rotor housing to the cooling housing. Coolant is fed at an inlet opening and is directed at the bottom side of the separating wall by an entrance channel, is redirected, and flows around the rotor housing until it reaches the top side of the separating wall. The coolant is redirected and is withdrawn through an exit channel that runs upward to the outlet opening. A bleed opening in the wall of the entrance channel and a vent opening in the wall of the exit channel allow for a residual amount of air to remain in the cooling chamber when it is filled with coolant, and for a residual fluid to remain when it is emptied.

Abstract: The invention relates to a multi step helical screw compressor unit which consists of a drive housing (90), wherein a first, second, and third helical screw compressor (60, 70, 80) are secured in a protruding manner parallel to each other and are driven together by a drive toothed wheel in the drive housing. A gas-like fluid is compressed by the first helical screw compressor (60) at a first intermediate pressure of approximately 3.5 bars, by the second helical screw compressor (70) at a second intermediate pressure of approximately 12 bars and by the third helical screw compressor (80) at an end pressure of approximately 40 bars. The driven toothed wheels (65, 75) of the first and the second helical screw compressors are in contact with the drive toothed wheel (95) above the axes thereof, when the driven toothed wheel (85) of the third helical screw compressor (80) is in contact with the drive toothed wheel (95) in the vicinity of the deepest point thereof (T).

Abstract: A screw compressor with two rotors held in a rotor housing has sealing arrangements 11, 11? to seal the pressurized side shaft pin of the rotors, wherein each sealing arrangement has a number of successive radial seal rings 11a, 11b and wherein it contains an annular relief chamber 51 at an intermediate position that is connected by means of a vent channel 53 to a chamber in the rotor housing in which a pressure is present that is higher than atmospheric pressure. It is preferred that the vent channel be connected to the intake chamber 10 of the rotor housing 1 and that this intake chamber be fed by a gas that is pre-compressed by a compressor stage.

Abstract: The invention relates to the rotor housing (1) of a helical screw compressor which is surrounded by a cooling housing (21, 23, 25) which forms a cooling chamber (27) which surrounds the rotor housing (1) in an annular-shaped manner, said cooling chamber being intercepted on a point by a separating wall (29) which connects the rotor housing (1) to the cooling housing (21). The coolant, which is guided to an inlet (31), is oriented counter to the lower side of the separating wall (29) through a perpendicular inlet channel (35) which flows in an upward direction, is deviated there and flows about the rotor housing (1) until the upper side of the separating wall (29), where it is deviated again and is discharged to the outlet opening (33) through a perpendicular outlet channel (37) which extends in an upward manner.

Abstract: The invention relates to a helical screw compressor which comprises two rotors (7, 9) having ribs (7?, 9) which extend a screw-like manner and grooves which engage with each other in a combing and sealing manner. The total number of ribs of both rotors is at least 14, and the height (H) of the grooves is no more than 0.15 times the external diameter (Da) of the rotor profile (7) and/or (9). The shaft journals of the rotors have a diameter which is not smaller than half of the external diameter (Da) of the rotor profile.