Abstract: A scroll fluid machine comprises a stationary scroll having a stationary wrap and an orbiting scroll having an orbiting wrap. A tip seal is provided in a tip-seal groove at the ends of the stationary and orbiting wraps to allow the stationary wrap to engage with the orbiting wrap slidably. The tip seal comprises a sealing material in the tip-seal groove and a backup material between the sealing material and the bottom of the tip-seal groove. The tip seal tightly contact the backup material without an adhesive to keep their sideward positional relationship exact.

Abstract: In a scroll fluid machine, a driving shaft has an eccentric axial portion around which an orbiting scroll revolves while the orbiting scroll engages with a fixed scroll. A cooling path extends through the driving shaft to a gap between the outer circumferential surface of the eccentric axial portion and the inner circumferential surface of an axial hole of the orbiting scroll. A cooling gas is introduced into the cooling path to cool bearings around the driving shaft. A forced convection generating portion is provided on the driving shaft for sucking the cooling gas into the gap and discharging the gas.

Abstract: A scroll fluid machine comprises a fixed scroll, an orbiting scroll and a self-rotation-preventing device for preventing the orbiting scroll from rotating on its own axis. The self-rotation-preventing device comprises a bearing in a support hole of the orbiting scroll, a crank pin which connects the orbiting scroll to the orbiting scroll, and an adjusting member interposed between the inner circumferential surface of the support hole and the outer circumferential surface of the bearing to correct an error in orbiting motion between the two scrolls.

Abstract: The method of managing time M, at which maintenance of a gas compressor multiple system incorporating therein a plurality of gas compressors should be carried out, involves making a comparison between a value of M and a predetermined time N for necessary maintenance to carry out the maintenance when the value of M is larger than or substantially equal to a value of N, where M is equal to the product of the operating time T of the system, the average load factor L, and a safety factor C.

Abstract: An acoustic fluid machine such as an air compressor comprises an acoustic resonator, a valve device and a piston. Air is sucked into the resonator through the valve device at one end of the resonator. The piston at the other end of the resonator is reciprocated by an actuator to compress the air in the resonator to cause resonance to increase pressure of the air significantly. The inner surface of the resonator is suitably curved to comply with the formula of a half-period cosine function.

Abstract: In a scroll compressor, a fixed wrap of a fixed end plate engages with an orbiting wrap of an orbiting plate to form a compressing chamber. A gas is introduced into the compressing chamber from the outer circumference and compressed towards the center as the orbiting end plate revolves with a driving shaft with respect to the fixed end plate. The gas is sent to a reciprocating compressor in which a piston moves up and down in a cylinder and further compressed therein.

Abstract: A scroll fluid machine has a fixed scroll in a housing and an orbiting scroll rotatably mounted to a driving shaft. A fixed wrap of the fixed scroll is engaged with an orbiting wrap of the orbiting scroll. The orbiting scroll is revolved at a certain eccentricity by the driving shaft, so that a gas sucked through the circumference of the housing is compressed as it moves toward the center, and discharged through the center. A gas-guiding bore is formed near the center of the orbiting scroll, and a heat-releasing rod is inserted in the bore. One end of the heat-releasing rod is projected from the fixed scroll to release heat to atmosphere.

Abstract: In a scroll fluid machine, an orbiting scroll engages with a stationary scroll to form a sealed chamber in which fluid can be compressed toward a center with revolution of the orbiting scroll with respect to the stationary scroll. An annular groove is formed near the outer circumference of the stationary scroll. A dust seal fits in the annular groove of the stationary scroll. The annular groove has almost the same width, but has a wider portion having the twice the width as the other. In the wider portion of the annular groove, the ends of the dust seal are overlapped. The overlapped surfaces are rough to engage with each other.

Abstract: A scroll fluid machine comprises an orbiting scroll and a stationary scroll. The orbiting scroll comprises an orbiting end plate having an orbiting wrap, and the stationary scroll comprises a stationary end plate having a stationary wrap. The orbiting scroll is supported to turn on an eccentric shaft portion of a drive shaft. The orbiting wrap engages with the stationary wrap to form a sealed chamber therebetween. A bearing tube is detachably disposed in a housing. The drive shaft is supported to turn in the bearing tube.

Abstract: A scroll fluid machine comprises a housing, a drive shaft, a stationary scroll fixed to the housing, and an orbiting scroll driven by the drive shaft. A gas from the outer circumference of the housing is introduced between the stationary and orbiting scrolls, and sent to the center by revolving the orbiting scroll in engagement with the stationary scroll. On the rear surface of the stationary scroll, there are provided a plurality of cooling fins that radially extend. Between the adjacent cooling fins, a silencer is provided to prevent noise caused by discharge of the gas.

Abstract: A scroll fluid machine comprises a housing having a fixed scroll and an orbiting scroll revolved by a driving shaft which is driven by a motor behind the housing. A blowing fan is provided between the orbiting scroll and the motor. Rotation of the fan causes decompression in the housing to allow primary external air to be sucked from the outside into the housing through a primary sucking hole. Secondary external air is introduced from a secondary sucking hole and mixed with the primary external air of the scroll fluid machine to cool the parts of the scroll fluid machine in the housing and/or the motor.

Abstract: In a scroll fluid machine, an orbiting scroll comprises an orbiting end plate having an orbiting wrap and a fixed scroll comprises a fixed end plate having a fixed wrap. An engagement groove is formed at the tip ends of the orbiting wrap and fixed wrap, and/or the fixed or orbiting end plate. A seal is fitted in the engagement groove in sliding contact with a counter member. The seal comprises a sealing material and a backup material between the sealing material and the bottom of the engagement groove. The backup material has a plurality of projections which elastically stretch to press the inner circumferential surface of the engagement groove when the seal is pressed.

Abstract: In a scroll fluid machine, a stationary scroll and an orbiting scroll are provided. On the stationary scroll opposing the orbiting scroll, an annular groove is formed. An O-ring, a flexible support ring and a sliding member are put in the annular groove. The support ring has legs between which the O-ring is held. The sliding member in sliding contact with the annular groove is placed on the support ring, thereby decreasing deterioration and keeping stable sealing.

Abstract: In a scroll fluid machine, an orbiting scroll is eccentrically revolved with respect to a stationary scroll so that fluid in a sealed chamber between the stationary and orbiting scrolls may be compressed toward a center. A first magnet is mounted on the stationary scroll and a second magnet is mounted on the orbiting scroll so that the same poles of the first and second scrolls may be opposite to each other thereby preventing the orbiting scroll from pressing the stationary scroll excessively.

Abstract: An oilless reciprocating fluid machine has a piston mounted to a connecting rod by inserting a piston pin in a pin bore of a cylinder. The piston is reciprocally moved up and down in the cylinder with reciprocating of the connecting rod. A reinforcement plate is embedded in the top wall of the piston or attached on the lower surface of the top wall to increase strength of the piston. The reinforcement plate may be formed in various shapes.

Abstract: A scroll fluid machine comprises a stationary scroll having a stationary wrap and an orbiting scroll having an orbiting wrap. A tip seal is provided in a tip-seal groove at the ends of the stationary and orbiting wraps to allow the stationary wrap to engage with the orbiting wrap slidably. The tip seal comprises a sealing material in the tip-seal groove and a backup material between the sealing material and the bottom of the tip-seal groove. The tip seal tightly contact the backup material without an adhesive to keep their sideward positional relationship exact.

Abstract: A cup (6) for spray guns, comprising a disposable container (8) joined in removable fashion to a lid (5) with axial outflow fitting (7), independent of the cup and integrated with the body (4) of the gun (1), and a lining element (18) whose shape is complementary to that of the lid (5) and which is inserted in removable fashion within said lid (5) between the container (8) and the outflow fitting (7).

Abstract: An inert gas is fed from an inert gas source to a piston-reciprocating compressor and compressed therein. The compressed gas is sent to a high-pressure storage tank. Pressure of the gas in the high-pressure storage tank is detected. When it reaches an upper limit, the piston-reciprocating compressor is stopped by a controller. At the same time, the gas is not fed from the inert gas source into the piston-reciprocating compressor and the gas from the compressor is released to outside. Meanwhile, when the pressure of the gas in the high-pressure storage tank reaches to a lower limit, the compressor starts. At the same time, the inert gas source is allowed to communicate with the compressor, and the gas which reaches to a desired density after the gas is released is sent from the compressor to the tank.

Abstract: An acoustic fluid machine has an acoustic resonator and a piston reciprocated by an actuator at the base of the acoustic resonator. A valve device is provided on the upper end of the acoustic resonator. External air is introduced into the acoustic resonator through the valve device. The piston has through-holes, through which front space communicates with rear space thereby reducing load applied onto the piston.