Abstract: A waste heat utilization device for an air compressor includes: a discharge path of an oil free air compressor; a circulation path along which a low boiling point medium circulates; an evaporator provided on the circulation path to heat and evaporate the low boiling point medium using the potential heat of the compressed air; and a preheater provided on an upstream side of the evaporator to preheat the low boiling point medium using the potential heat of the compressed air. A scroll type expansion machine is rotated by the low boiling point medium evaporated by the evaporator and increased in pressure, and power is generated by a power generator connected to a rotary shaft of the scroll type expansion machine. The low boiling point medium discharged from the scroll type expansion machine is then cooled and condensed by a condenser.

Abstract: To realize an increase in lifespan and a reduction in cost in an interlocking mechanism that causes a driving scroll and a driven scroll to rotate synchronously, a through hole is drilled into a peripheral edge portion of a driving scroll side end plate, and a pin member is fixed to the through hole. A base is provided on a driven scroll side spiral projection that faces the through hole. A columnar recessed portion is carved into an opposing surface of the base, and an aluminum rotary body is loosely fitted into the recessed portion. An eccentric hole is drilled into the rotary body, and the pin member is loosely fitted into the eccentric hole. The interlocking mechanism is disposed in an odd number at equal intervals on an outer edge portion of the scroll end plate such that loads exerted on the rotary body act in an identical plane.

Abstract: A multistage vacuum pump unit can save a power requirement and prevent the gas discharged outside of the unit from flowing-back inside the pump unit. A plurality of vacuum pumps are connected in series to form the multistage vacuum pump unit. A suction inlet of a first stage vacuum pump thereof is connected to a to-be-vacuumized container so that the space inside of the container becomes under a high vacuum condition. In an operating method, part of the gas discharged into a first intermediate passage from the first stage vacuum pump is branched during a low vacuum operation, and discharged toward an air atmosphere through a low conductance line provided with check valves that prevent the branched gas from flowing back.

Abstract: A multistage vacuum pump has a pair of rotors disposed in each of pump chambers connected in stages. As the rotors rotate while intermeshing, a suctioned gas is compressed and discharged, angles of the rotors are adjusted so that a phase angle ?? of the rotors of adjacent pump chambers relative to a rotation angle C of the rotors during a single cycle of the pump chambers from intake to discharge and the number of stages S of the rotors satisfies ???C/S. When a rotor angle is ?1, an mth stage rotor angle is ?m, and an nth stage rotor angle is ?n in order from an upstream side of a gas flow direction, relationships of ?1??m??n and ?1<?n, where n and m are natural numbers and n>m, are satisfied.

Abstract: A Volatile Organic Compounds (VOC) removal solution regeneration and recovery apparatus removes VOC contained in a VOC removal solution. The apparatus includes a liquid pump, a vacuum vessel, a vacuum pump, a gas introducing mechanism that introduces an evaporation enhancing gas into the vacuum vessel, and a liquid discharge mechanism that discharges processed VOC removal solution from the vacuum vessel. The apparatus further includes a compressor that generates compressed air having thermal energy and pressure energy. The liquid pump is an air-driven pump that is driven by air pressure as a power source, and the pressure energy of the compressed air is used as the power source of the liquid pump.

Abstract: The rotating shaft is connected to the generator; the high-pressure steam s is introduced to the expansion chamber b through the guide passage; when the energy of the high-pressure steam s during expansion process revolves the revolving scroll, the generator regenerates electric power. The connecting housing is provided with the inlet opening and the outlet opening; the ventilation blades are fitted to the rotating shaft. When the ventilation blades rotate, the outside air is introduced (inside of the housing) from and through the inlet opening; the air passes by the air opening and the backside of the revolving scroll, and is discharged through the outlet opening. Thus, by the approach that the air passage is formed inside of the connecting housing and the scroll housing, the high-pressure steam s is prevented from being directed toward the backside of the revolving scroll.

Abstract: A scroll fluid machine has a stationary scroll having a stationary scroll lap fixed to a scroll casing and an orbiting scroll having an orbiting scroll lap that orbits relative to the stationary scroll lap. The stationary and orbiting scrolls are connected via a coupling mechanism other than an Oldham coupling or pin crank type mechanism having sliding parts. The coupling mechanism includes plate springs that connect the stationary scroll to the orbiting scroll. The orbiting scroll lap engages with the stationary scroll lap to form a closed compression chamber.

Abstract: A scroll fluid machine has a stationary scroll having a stationary scroll lap and an orbiting scroll having an orbiting scroll lap that orbits relative to the stationary scroll lap. The orbiting scroll lap engages with the stationary scroll lap to form a closed compression chamber. An intermediate ring is positioned to surround the orbiting scroll lap. A plurality of first plate springs connect the intermediate ring and the orbiting scroll, while supporting the intermediate ring to enable the intermediate ring to move in a first direction orthogonal to a rotation axis of the machine. A plurality of second plate springs connect the intermediate ring and the stationary scroll, while supporting the intermediate ring to enable the intermediate ring to move in a second direction orthogonal to the rotation axis of the machine as well as orthogonal to the first direction.

Abstract: A compressor capacity control method and a device is provided. The changeover from a loading state regarding the compressor to an unloading state regarding the compressor and vice versa is controlled, whereby, during a time span from a starting time point when the compressor operation state changes into an unloading state to a time point when a loading/unloading operation-cycle is finished and a predetermined time duration has passed after the starting time point, the time cycle control is performed so that the loading state is changed into the unloading state, at a time point when the predetermined time duration has passed. Further, the discharge pressure of the fluid discharged from the compressor is detected so that the loading state is changed into the unloading state in a case where the discharge pressure exceeds a prescribed upper limit pressure.

Abstract: To provide a motor-directly connected compressor unit which is equipped with a cooling means for suppressing the heating of the compressor and is easy to transfer without upsizing the compressor unit in size or weight, the compressor unit is configured such that a sirocco fan 30 is arranged between a scroll compressor 20 and a drive motor 60 located under the sirocco fan 30; an output shaft 62 of the drive motor 60, a drive shaft 33 of the sirocco fan 30 and a rotation shaft 28 of the scroll compressor 20 are linearly connected in the same straight line; a housing 32 of the sirocco fan 30 is fixed on a mount 50 which is supported on legs 54 via anti-vibration rubber pads 52; a cooling jacket is arranged to cover a top of a housing 21 of the scroll compressor 20; and an air outlet 31 arranged in the housing 32 of the sirocco fan 30 is in communication with a cooling jacket 40 via a duct 44 so as to feed air a from the sirocco fan 30 to the cooling jacket 40, thereby cooling the scroll compressor.

Abstract: A follower shaft is rotatably supported coaxially with a driving shaft. An inner rotary permanent magnet having poles in a radial direction is fixed around an outer circumference of the end of the follower shaft. On the inner circumferential surface of a cylindrical coupling, an outer rotary permanent magnet is fixed such that opposite poles face each other between the inner rotary permanent magnet and the outer rotary permanent magnet. A fixed permanent magnet is fixed such that like poles face each other between the fixed permanent magnet and the inner rotary permanent magnet. Thus, rotation of the driving shaft is transmitted to the follower shaft without contact.

Abstract: A scroll fluid machine comprises a driving shaft in a housing. An orbiting scroll is eccentrically revolved around an eccentric axial portion of the driving shaft via a bearing. Air is introduced from outside through an intake port of a circumferential wall of the housing and directed toward the bearing by a guide to cool the bearing.

Abstract: A rotor shaft sealing method for an oil-free rotary compressor is provided, with which occurrence of lubrication oil intrusion into the compression chamber of the compressor which is liable to occur when negative pressure is produced in the compression chamber, is prevented. With a rotor shaft sealing structure composed such that two shaft seal means are provided in the rotor casing between the oil lubricated bearing and the compression chamber such that an annular airspace is formed between the two shaft seal means, at least one communicating hole is provided to communicate the annular airspace to the outside of the rotor casing, and the annular airspace of the male rotor shaft sealing part and the annular airspace of the female rotor shaft sealing part are connected by a between-rotor shaft communication passage, pressurized air is supplied to the annular airspaces by which lubrication oil intrusion into the compression chamber is prevented.

Abstract: A multistage vacuum pump unit can save a power requirement and prevent the gas discharged outside of the unit from flowing-back inside the pump unit. A plurality of vacuum pumps are connected in series to form the multistage vacuum pump unit. A suction inlet of a first stage vacuum pump thereof is connected to a to-be-vacuumized container so that the space inside of the container becomes under a high vacuum condition. In an operating method, part of the gas discharged into a first intermediate passage from the first stage vacuum pump is branched during a low vacuum operation, and discharged toward an air atmosphere through a low conductance line provided with check valves that prevent the branched gas from flowing back.

Abstract: A drive transmission mechanism for transmitting torque between two or more rotary shafts in synchronization with one another without need for lubrication thereby eliminating occurrence of oil contamination, and an oil-free fluid machine equipped with the mechanism, are provided. A magnetic drive disk and a synchronization gear are attached to a rotary shaft connected to a drive motor, a magnetic drive disk and a synchronization gear is attached to a rotary shaft, torque transmission from the rotary shaft to the rotary shaft is carried out in two ways, via the magnetic drive disks and via the synchronization gears and at least one of the synchronization gears is made of plastic material. With the construction, torque transmit load between the rotary shafts via the synchronization gears is decreased, and a plastic gear or gears can be adopted for synchronization gears without reducing life of the gears without need for lubrication oil.

Abstract: In an acoustic fluid machine, an acoustic resonator gradually reduces in diameter towards the top on which a valve device is provided to suck a gas into the resonator. The gas is compressed in the resonator by a circular-plate piston at the lower end of the resonator and discharged via an outlet of the valve device. The piston comprises a rubber plate fixed to the resonator and a metal plate attached on the rubber plate.