Abstract: A turbo refrigerator is provided with: a turbo compressor having a motor; an oil cooling unit which cools lubricating oil which is supplied to at least a portion of the turbo compressor; a refrigerant introduction part which introduces some of the refrigerant which circulates between an evaporator and a condenser into a motor accommodation space and the oil cooling unit; and a cooling unit which cools the refrigerant which is introduced into the motor accommodation space and the oil cooling unit.

Abstract: Provided are a turbo compressor which is provided with an impeller rotating about a rotating shaft, and a seal part having a facing portion which faces an outer diameter portion of a hub of the impeller in a radial direction, in which a shunting groove for foreign matter which has infiltrated between the outer diameter portion and the facing portion is formed in the seal part, and a turbo refrigerating machine which is provided with the turbo compressor.

Abstract: A sealing mechanism (40) includes: a ring-shaped sealing body (41) which surrounds a rotating shaft (24) when viewed from an axial direction; a sealing-body support part (42) which supports the sealing body (41) so as to be movable in a radial direction of the rotating shaft (24); and an elastic member (44) which is interposed between the sealing body (41) and the sealing-body support part (42).

Abstract: A centrifugal compressor (1) that includes: an auxiliary bearing (7) which supports a shaft (2), which is supported by a magnetic bearing (6), when the shaft (2) is displaced from a reference position; and a stopper (8) that is provided only for a first auxiliary bearing (7a) among the first auxiliary bearing (7a) and a second auxiliary bearing (7b), that is fixed to the shaft (2), and that restricts a movement of the shaft (2) in both directions in an axial direction by the stopper (8) being brought into contact with the first auxiliary bearing (7a).

Abstract: A liquid level indicator including a liquid level calm portion that is provided with a liquid introduction inlet that communicates with a portion below the liquid level in an oil tank and a gas vent that communicates with a portion above the liquid level; and a sight glass for observing a liquid level in the liquid level calm portion, having a liquid introduction tube provided with an extension portion that communicates with the liquid introduction inlet and extends toward the bottom portion of the oil tank, and a distal end portion that communicates with the extension portion and opens in a direction other than the downward direction below the liquid level.

Abstract: A turbo compressor includes: a compressor casing which accommodates impellers compressing gas by rotation; and a motor casing which accommodates a motor rotating the impellers, wherein the motor casing has a cylindrical main body part having a larger diameter than a mounting flange provided in the compressor casing, and the compressor casing and the motor casing are connected through an adapter member.

Abstract: A turbo refrigerator (1) includes: a turbo compressor (5) to which a gas-phase component (X3) of a refrigerant from an economizer (3) is supplied, wherein the turbo compressor (5) includes a first flow path (R10) through which a compressed refrigerant gas (X1) flows, and a connecting pipe (5b) connected to the first flow path (R10) and a second flow path (R3) through which the gas-phase component (X3) of the refrigerant flows, and the diameter of the connecting pipe (5b) reduces toward the first flow path (R10) from the second flow path (R3).

Abstract: A turbo compressor that has a pressure equalizing tube that circulates a gas from a gear unit accommodation space toward an IGV accommodation space, and an oil separation device that is provided in the gear unit accommodation space to separate lubricating oil that is contained in the gas, in which the oil separating device has a suction duct that communicates with the pressure equalizing tube, and the suction duct has a centrifugal separation portion provided with a first demister, a second demister provided on the downstream side of the first demister in relation to the suction direction, and a curved passage provided between the first demister and the second demister.

Abstract: A turbo-compressor including a variable vane that adjusts the flow rate of a fluid, a drive shaft that is connected to the variable vane and is rotated to drive the variable vane, a motor that rotationally drives the drive shaft, and a coupling that couples the drive shaft with an output shaft of the motor. Between the drive shaft and output shaft and the coupling, a vibration isolation means is arranged to connect the drive shaft and output shaft to each other so that they rotate together and allow the drive shaft and output shaft to move in a vibration direction.

Abstract: A turbo compressor that has a compression stage provided with an impeller that rotates; a housing provided with a gear unit accommodation space that accommodates lubricating oil and accommodates a large diameter gear that transmits rotating force to the impeller, an IGV accommodation space in which the ambient pressure is lower than the gear unit accommodation space, and a gap that brings the IGV accommodation space and the air intake side of a first compression stage into communication; a pressure equalizing tube that causes a gas to circulate from the gear unit accommodation space toward the IGV accommodation space; and a second oil separating device that separates, in the IGV accommodation space, the lubricating oil contained in the gas.

Abstract: A mounting structure for a main terminal for mounting the main terminal to a housing in the state of one end portion to which a lead wire can be affixed being inserted into the housing, and the other end portion being exposed to the outside of the housing, in which the housing has a mounting hole for inserting and extracting the one end portion together with the lead wire; and the main terminal has a flange portion that can mount the main terminal about the mounting hole from the outside of the housing without involving rotation of the main terminal.

Abstract: A turbo compressor includes a housing in which lubrication oil is accumulated, a gear that is housed in the housing and to which the lubrication oil is supplied, a demister that is disposed above the gear and on which an intake is provided to catch oil mist of the lubrication oil in the housing, a gear cover that is provided surrounding the gear to catch lubrication oil splashed by the gear and then drip the caught lubrication oil downward, and a demister cover that is disposed near the demister to drip the lubrication oil caught by the demister downward. Here, a narrow gap is formed between the demister cover and an inner wall surface of the housing. According to the turbo compressor, an amount of lubrication oil flowing through the demister can be reduced by the gear cover and the demister cover.

Abstract: A turbo compressor includes: a compressor casing which accommodates impellers compressing gas by rotation; and a motor casing which accommodates a motor rotating the impellers, wherein the motor casing has a cylindrical main body part having a larger diameter than a mounting flange provided in the compressor casing, and the compressor casing and the motor casing are connected through an adapter member.

Abstract: A turbo compressor which is provided with a lubricant spray nozzle which is disposed to penetrate a housing and sprays a lubricant toward a bearing accommodated in the housing, and an external manifold which is detachably mounted on the housing and supports the lubricant spray nozzle outside of the housing is adopted.

Abstract: Provided are a turbo compressor which is provided with an impeller rotating about a rotating shaft, and a seal part having a facing portion which faces an outer diameter portion of a hub of the impeller in a radial direction, in which a shunting groove for foreign matter which has infiltrated between the outer diameter portion and the facing portion is formed in the seal part, and a turbo refrigerating machine which is provided with the turbo compressor.

Abstract: A turbo refrigerator (1) includes: a turbo compressor (5) to which a gas-phase component (X3) of a refrigerant from an economizer (3) is supplied, wherein the turbo compressor (5) includes a first flow path (R10) through which a compressed refrigerant gas (X1) flows, and a connecting pipe (5b) connected to the first flow path (R10) and a second flow path (R3) through which the gas-phase component (X3) of the refrigerant flows, and the diameter of the connecting pipe (5b) reduces toward the first flow path (R10) from the second flow path (R3).

Abstract: A sealing mechanism (40) includes: a ring-shaped sealing body (41) which surrounds a rotating shaft (24) when viewed from an axial direction; a sealing-body support part (42) which supports the sealing body (41) so as to be movable in a radial direction of the rotating shaft (24); and an elastic member (44) which is interposed between the sealing body (41) and the sealing-body support part (42).

Abstract: A turbo refrigerator is provided with: a turbo compressor having a motor; an oil cooling unit which cools lubricating oil which is supplied to at least a portion of the turbo compressor; a refrigerant introduction part which introduces some of the refrigerant which circulates between an evaporator and a condenser into a motor accommodation space and the oil cooling unit; and a cooling unit which cools the refrigerant which is introduced into the motor accommodation space and the oil cooling unit.

Abstract: An electrical motor includes a motor case inside which an inner space is formed, a bearing disposed so as to pass through a wall of the motor case, a rotor shaft rotatably supported by the bearing, and an earth conductor fixed with the motor case and provided with a frame and an electrical conductor provided on the frame. The frame has an annular inner circumferential surface along an outer circumference of the rotor shaft and is fixed with the motor shaft. The electrical conductor is disposed on the inner circumferential surface of the frame so as to slidably contact its end with the rotor shaft. A bypass flow passage is provided between the earth conductor and the motor case. The inner space is communicated with an outside of the motor case via the bypass flow passage. According to the motor, its inside can be cooled without damaging the earth conductor.

Abstract: A turbo compressor that has a pressure equalizing tube that circulates a gas from a gear unit accommodation space toward an IGV accommodation space, and an oil separation device that is provided in the gear unit accommodation space to separate lubricating oil that is contained in the gas, in which the oil separating device has a suction duct that communicates with the pressure equalizing tube, and the suction duct has a centrifugal separation portion provided with a first demister, a second demister provided on the downstream side of the first demister in relation to the suction direction, and a curved passage provided between the first demister and the second demister.