Abstract: This turbo chiller includes a shell-and-tube condenser; a header along a length direction of a shell is installed on a refrigerant inlet of the condenser, and openings are formed at least on both end portions of the header in the length direction, which allows high-temperature and high-pressure refrigerant gas from a compressor to be smoothly and evenly distributed to both length-direction end areas in the shell of the condenser through the header.

Abstract: The object of the present invention is to suppress a mechanical loss caused by thermal elongation or rotational vibration of a rotary shaft of a turbo compressor for compressing a low pressure refrigerant used at a maximum pressure of less than 0.2 MPaG so as to enhance the efficiency of a turbo chilling apparatus. The turbo compressor is a turbo compressor for compressing a low pressure refrigerant used at a maximum pressure of less than 0.2 MPaG, the turbo compressor including: a rotary shaft; an electric motor coaxially disposed on an intermediate portion of the rotary shaft so a to rotationally drive the rotary shat impellers fixed to one end of the rotary shaft and forming a compression portion; a first bearing pivotally sporting the rotary shaft between the electric motor and the impellers; and a second bearing pivotally supporting the other end of the rotary shaft, wherein the first bearing is formed of a rolling bearing, and the second bearing is formed of a sliding bearing.

Abstract: This turbo chiller includes a shell-and-tube condenser; a header along a length direction of a shell is installed on a refrigerant inlet of the condenser, and openings are formed at least on both end portions of the header in the length direction, which allows high-temperature and high-pressure refrigerant gas from a compressor to be smoothly and evenly distributed to both length-direction end areas in the shell of the condenser through the header.

Abstract: This centrifugal compressor is provided with an impeller mounted on a main shaft rotating around an axis line, and a vane device for adjusting the flow rate of a fluid in an inflow flow path to the impeller. The vane device includes: a plurality of vane main bodies provided at intervals in a circumferential direction, wherein a mounting angle of the plurality of vane main bodies is changed by rotating the shaft portion; a plurality of link members which is rotated along with the shaft portion; a drive ring which is formed with an annular shape centered on the axis line and is moved in a moving direction along a rotation locus of the link member, and a drive mechanism which is connected to the drive ring and transmits a force in a tangential direction to the drive ring.

Abstract: A compressor driving motor includes: a rotor; a stator surrounding an outer peripheral part of the rotor; a case accommodating the rotor and the stator; a liquid introduction portion introducing a liquid refrigerant from a refrigerant circuit including the compressor into the case; a gas introduction portion introducing a gas refrigerant from the refrigerant circuit into the case; and an injector using, as driving fluid, the gas refrigerant introduced by the gas introduction portion, and using, as suction fluid, the liquid refrigerant introduced by the liquid introduction portion. Wet steam of a mixture of the liquid refrigerant and the gas refrigerant mixed by the injector is injected toward at least a gap between the outer peripheral part of the rotor and an inner peripheral part of the stator.

Abstract: Provided are an inlet guide vane and a centrifugal compressor such that air can be caused to efficiently flow in with use of a simple shape. The inlet guide vane is disposed upstream of an impeller in a flow path of a centrifugal compressor. The inlet guide vane has: a plate-shaped plate section that is disposed in the flow path; and a rotation part that causes the plate section to rotate along an axis of rotation aligned with the radial direction of a rotary shaft of the centrifugal compressor. In a cross-section orthogonal to the axis of rotation of the rotation part, the plate section has, at the leading edge thereof on the upstream side of the flow path, a bent part that is tilted with respect to the other portions.

Abstract: A compressor driving motor includes: a rotor; a stator surrounding an outer peripheral part of the rotor; a case accommodating the rotor and the stator; a liquid introduction path introducing a liquid refrigerant from a refrigerant circuit including a compressor; and a gas introduction path introducing a gas refrigerant from the refrigerant circuit. The case includes a downstream chamber located on one end side of the rotor and the stator in an axial direction and provided with the compressor, and an upstream chamber located on the other end side in the axial direction and communicating with the downstream chamber through a gap between the outer peripheral part of the rotor and an inner peripheral part of the stator. The introduced liquid refrigerant and the introduced gas refrigerant are mixed in the upstream chamber, and wet steam of the mixed refrigerant is supplied to at least the gap.

Abstract: Provided is an oil tank of a turbo chiller compressor whose heater can be replaced or checked without removing oil from an oil tank and removing refrigerant from a turbo chiller, and a turbo chiller compressor. An oil tank (10) of a turbo chiller compressor (3A) includes a bottom plate (11) and side plates (12, 13) standing upright so as to extend upward from an outer peripheral edge portion of the bottom plate (11). The oil tank (10) forms a bottom portion of a casing (14) forming the turbo chiller compressor (3A), a through-hole (21) is formed so as to penetrate the side plate (12) in a plate thickness direction, a protective tube (22) closed at a tip end thereof is inserted into the through-hole (21), and a rod-shaped heater (26) configured to be able to be pulled out from the protective tube (22) and be inserted into the protective tube (22) is inserted into the protective tube (22).

Abstract: A centrifugal chiller in which a closed-cycle refrigeration cycle is formed by connecting a compressor, a condenser, an economizer and decompression means forming a multi-stage compression cycle, and an evaporator, with the refrigeration cycle being charged with a low-pressure refrigerant. The condenser and the economizer are integrated with each other by having a portion of their vessel walls form a shared wall, with the base surface of the economizer being positioned below the base surface of the condenser and above the base surface of the evaporator.

Abstract: An evaporator includes: a vessel having a refrigerant inlet for receiving a refrigerant at a lower part of the vessel, and a refrigerant outlet for discharging the refrigerant in an evaporated state at an upper part of the vessel; and a plurality of heat-transfer tubes disposed so as to extend inside the vessel along a longitudinal direction of the vessel, and configured to transfer heat received from a fluid flowing inside the heat-transfer tubes to the refrigerant flowing outside the heat-transfer tubes. The plurality of heat-transfer tubes are disposed so that at least one downward flow passage is defined through the plurality of heat-transfer tubes or around the plurality of heat-transfer tubes, the at least one downward flow passage having a width larger than a representative interval between the plurality of heat-transfer tubes.

Abstract: A turbo chiller that has an oil-free configuration, which reduces the frequency of maintenance and maintenance-induced release of refrigerant, and can achieve a reduced environmental impact by utilizing the characteristics of the low-pressure refrigerant R1233zd(E) that reaches negative pressure at a saturation temperature of 18° C. or lower. The turbo chiller comprises a refrigeration cycle that includes a turbo compressor, a condenser, a decompression device, and an evaporator connected in sequence via piping and is filled with a refrigerant; wherein the refrigerant is a low-pressure refrigerant R1233zd(E) refrigerant with low global warming potential and low ozone depletion potential; the turbo compressor has a direct drive configuration in which a rotating shaft of impellers is directly joined to a motor; and the rotating shaft is supported by magnetic bearings.

Abstract: This invention relates to a method producing a common rail excellent in fatigue strength from an inexpensive steel which uses as the material of the common rail a steel for high-strength liquid phase diffusion bonding having good toughness and fatigue strength, which steel contains, in mass %, C: 0.01 to 0.3%, Si: 0.01 to 0.5%, Mn: 0.01 to 3.0%, Cr: 1.0 to 12.0% and Mo: 0.1 to 2.0%, further contains, in mass %, V: 0.01 to 1.0%, B: 0.0003 to 0.01%, Ti: 0.01 to 0.05% and N: 0.001 to 0.01%, has P content limited to 0.03% or less, S content to 0.01% or less and O content to 0.01% or less, further has total content of grain boundary segregated embrittling elements As, Sn, Sb, Pb and Zn limited to 0.015% or less, and a balance of unavoidable impurities and Fe.

Abstract: A control apparatus for a parallel-type chiller provided with multiple shell-and-tube-type heat exchangers and multiple compressors, the control apparatus having an estimation section which estimates a terminal temperature difference in an upstream-side space on the basis of a terminal temperature difference between a saturation temperature of a second fluid and a measured exit temperature value, the saturation temperature being estimated on the basis of a pressure value of the second fluid in a downstream-side space, the measured exit temperature value being a temperature of the first fluid measured at an exit of the heat exchanger, and estimates a temperature of the first fluid in the vicinity of an exit of the upstream-side space on the basis of the terminal temperature difference in the upstream-side space and the saturation temperature of the second fluid in the upstream-side space.

Abstract: The present invention has an object to suppress an overshoot in the outlet temperature of a heat medium. A heat source machine controlling apparatus includes a computing unit and a set temperature changing unit. The computing unit calculates a load change rate using a predetermined arithmetic expression. The set temperature changing unit determines whether or not the load change rate calculated by the computing unit exceeds a predetermined threshold value. In the case where the load change rate exceeds the predetermined threshold value, the set temperature changing unit changes a set chilled water outlet temperature so as to suppress a change in a chilled water outlet temperature.

Abstract: In a turbo chiller, pipe joint groups (23 to 26) provided to refrigerant cooling pipe systems (13 to 16) and lubricant pipe systems connected to a turbo compressor (2) and a motor (3), as well as a joint group (28) of various replacement components (27) provided to the pipe systems, are intensively placed, and at least one refrigerant detection sensor (32) is arranged below the intensive placement region (30) of the joint groups (23 to 28) and at a pre-identified point at which a slight amount of refrigerant that leaks from each of the joint groups (23 to 28) and flows downward is distributed and pools at a high concentration, whereby the slight amount of refrigerant leakage can be detected by the refrigerant detection sensor (32).

Abstract: The purpose of the present invention is to provide: a turbo compressor which is provided with an open impeller and has the minimal gap between the shroud and the impeller such that efficiency is improved and the safe operating region is enlarged; and a turbo chiller using the same. The turbo compressor is provided with an open impeller with a shroud provided on the side of a casing, and the rotary shaft is supported by a radial magnetic bearing and a magnetic thrust bearing. The turbo compressor is provided with a control unit that comprises: a load calculating means that calculates the axial thrust load generated by the pressure distribution of the compressor; and an axial support position control means that controls a gap between the impeller and the shroud to be a target gap by varying, on the basis of the axial thrust load, the axial support position of the rotary shaft due to the magnetic thrust bearing.

Abstract: Provided is an oil tank of a turbo chiller compressor whose heater can be replaced or checked without removing oil from an oil tank and removing refrigerant from a turbo chiller, and a turbo chiller compressor. An oil tank (10) of a turbo chiller compressor (3A) includes a bottom plate (11) and side plates (12, 13) standing upright so as to extend upward from an outer peripheral edge portion of the bottom plate (11). The oil tank (10) forms a bottom portion of a casing (14) forming the turbo chiller compressor (3A), a through-hole (21) is formed so as to penetrate the side plate (12) in a plate thickness direction, a protective tube (22) closed at a tip end thereof is inserted into the through-hole (21), and a rod-shaped heater (26) configured to be able to be pulled out from the protective tube (22) and be inserted into the protective tube (22) is inserted into the protective tube (22).

Abstract: This centrifugal compressor is provided with an impeller mounted on a main shaft rotating around an axis line, and a vane device for adjusting the flow rate of a fluid in an inflow flow path to the impeller. The vane device includes: a plurality of vane main bodies provided at intervals in a circumferential direction, wherein a mounting angle of the plurality of vane main bodies is changed by rotating the shaft portion; a plurality of link members which is rotated along with the shaft portion; a drive ring which is formed with an annular shape centered on the axis line and is moved in a moving direction along a rotation locus of the link member, and a drive mechanism which is connected to the drive ring and transmits a force in a tangential direction to the drive ring.

Abstract: This invention provides Cephem compounds having the formula: or an ester, a protected compound at the amino on the ring in the 7-side chain, a pharmaceutically acceptable salt, or a solvate thereof, a pharmaceutical composition thereof, and a method for treating a bacterial infectious disease with the compound, the ester, the protected compound, the salt, or the solvate thereof, wherein the symbols in the formula are defined in the specification. The compounds exhibit potent antimicrobial spectrum against a variety of bacteria including Gram negative bacteria and/or Gram positive bacteria, preferably beta-lactamase producing Gram negative bacteria, more preferably, multi-drug resistant microbials, in particular, Class B type metallo-beta-lactamase producing Gram negative bacteria, and still preferably extended-spectrum beta-lactamase (ESBL) producing bacteria. The compounds most preferably do not exhibit cross-resistance against known Cephem drugs or Carbapenem drugs.

Abstract: A fabrication method for a multi-piece board includes: checking whether pieces (printed wiring boards) are defect-free or not; forming a first recess in a joint portion between a defective piece and a frame; forming a first fitting portion at the frame by separating the defective piece; cutting out a defect-free piece having a second fitting portion from another board; forming a second recess in the second fitting portion; fitting the second fitting portion into the first fitting portion; flattening a joint portion; and filling an adhesive in a third recess which is formed by the first recess and the second recess, and curing the adhesive to adhere the frame and the defect-free piece.