JP2011075254A - Turbo refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turbo refrigerator including a centrifugal compressor suppressing deterioration of efficiency by eliminating pressure loss of a vapor refrigerant, reducing size by space saving, and smoothly guiding an evaporated refrigerant to a condenser by a simple configuration. <P>SOLUTION: In the turbo refrigerator, a refrigerant (R1) of a gaseous phase from an evaporator (1) is compressed by a turbo compressor (2), it is condensed by the condenser (4), an obtained refrigerant (R3) of a liquid phase is evaporated by the evaporator (1), and by this, a cooling object (W1) is cooled by heat of vaporization. The compressor (2) is an addorsed two-stage centrifugal type, and the condenser (4) is disposed in a position overlapping a compressor subsequent stage (2R) as seen from the axial direction (S) and the radial direction (R) in an outer side of the compressor subsequent stage (2R). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  In the present invention, a gas phase refrigerant is compressed by a turbo compressor and then condensed by a condenser, and the obtained liquid phase refrigerant is evaporated by an evaporator, whereby a turbo object that cools an object to be cooled with its heat of vaporization. It relates to a refrigerator.

  In recent years, a turbo chiller of this type has been proposed that uses water as a refrigerant instead of greenhouse gases such as chlorofluorocarbon for environmental measures. In such a turbo refrigerator, water having a higher boiling point than that of chlorofluorocarbon is evaporated under a low pressure, so that the density of the refrigerant decreases and the volume flow rate increases, so that the compressor becomes large. On the other hand, since water has better thermal conductivity than Freon, heat exchangers such as condensers and evaporators are not as large as compressors. Therefore, although the apparatus is enlarged, the compressor, the condenser and the evaporator are not enlarged at the same ratio, but only the compressor is larger than the other components. When a compressor, heat exchanger, which is a general structure of a Freon turbo chiller, is used as a separate element, and a structure in which pipes are connected to each other is applied to water refrigerant, only the compressor becomes larger and the centrifugal blade A large dead space is generated around the car. Moreover, in order to suppress the enlargement of the apparatus as much as possible, the piping is made as small as possible, so the flow rate of the refrigerant increases, pressure loss occurs, and the performance of the refrigerator decreases.

  As a countermeasure, the diffuser duct that follows the impeller is not arranged by arranging the impellers of the two-stage centrifugal compressor back to back, collecting the refrigerant that flows out radially by the scroll, and connecting it to the evaporator ⇒ condenser. A plurality of the first-stage diffuser ducts and the second-stage diffuser ducts are alternately arranged in the circumferential direction (see Patent Document 1).

Japanese Patent No. 4191477

  However, the compressor of Patent Document 1 has a very complicated configuration. Also, a large dead space remains around the centrifugal impeller.

  The present invention can reduce the pressure loss due to the connection pipe of the vapor refrigerant and suppress the decrease in efficiency, can be reduced in size to save space, and can smoothly guide the evaporative refrigerant to the condenser with a simple configuration. It is an object of the present invention to provide a turbo refrigerator equipped with a centrifugal compressor.

  In order to achieve the above object, a turbo refrigerator according to one configuration of the present invention compresses a gas-phase refrigerant from an evaporator with a turbo compressor, condenses it with a condenser, and converts the obtained liquid-phase refrigerant into A turbo chiller that cools an object to be cooled with its heat of vaporization by evaporating in the evaporator, wherein the compressor is a back-to-back two-stage centrifugal type, and the condenser is a rear stage of the compressor. Outside the compressor, it is disposed at a position where it overlaps with the rear stage of the compressor when viewed from the axial direction and the radial direction. Here, “polymerize” means a state in which at least a part of them overlap.

  According to this turbo chiller, the condenser is arranged outside the latter stage of the compressor at a position where it is superposed with the latter stage of the compressor when viewed from both the axial direction and the radial direction, that is, in the vicinity of the periphery of the latter stage of the compressor. Therefore, the vapor refrigerant flowing out from the impeller at the rear stage of the compressor is directly and smoothly supplied to the condenser without going through the scroll and the long connecting pipe, so that the latter stage of the compressor in the existing turbo refrigerator Both the scroll for collecting the evaporative refrigerant and the connecting pipe for guiding the collected vapor refrigerant to the condenser are not required. As a result, the pressure loss that has occurred in the scroll and the connecting piping is eliminated, so that a reduction in efficiency of the refrigerator can be suppressed. Further, since the condenser is provided using the space around the rear stage of the compressor, which has been a large dead space in the past, the entire refrigerator can be reduced in size by saving space.

  In this invention, it is preferable that the said condenser is arrange | positioned between the intermediate path which guide | induces a refrigerant | coolant from the said front stage of a compressor to the said back stage of a compressor, and the said back stage of a compressor. According to this configuration, the vapor refrigerant flowing radially from the rear stage of the compressor can be supplied to the condenser without traversing the intermediate passage.

  In this invention, it is preferable that the intermediate cooler which cools the refrigerant | coolant guide | induced to the said compressor back | latter stage from the said compressor front stage is arrange | positioned behind the said condenser. According to this structure, the compression efficiency of a compressor improves by supplying the vapor refrigerant | coolant which was compressed in the front stage of a compressor and the temperature rose to the back stage of a compressor after cooling with an intermediate cooler. Further, the intercooler can be arranged in a compact manner by concentric with the compressor.

  A turbo refrigerator according to another configuration of the present invention compresses a gas-phase refrigerant from an evaporator by a turbo compressor, condenses it by a condenser, and evaporates the obtained liquid-phase refrigerant by the evaporator. The centrifugal chiller cools the object to be cooled with the heat of vaporization, wherein the compressor is a multistage centrifugal type having two or more stages, and the condenser is located outside the last stage of the compressor and the last stage of the compressor. It arrange | positions in the position which overlaps seeing from a step and an axial direction and radial direction. This turbo refrigerator also eliminates the need for a scroll for collecting the evaporated refrigerant and a connecting pipe for guiding the collected vapor refrigerant to the condenser. As a result, a reduction in efficiency of the refrigerator can be suppressed, and the condenser is provided using the space around the last stage of the compressor, so that the entire refrigerator can be reduced in size by saving space.

  A turbo chiller according to still another configuration of the present invention compresses a gas-phase refrigerant from an evaporator with a turbo compressor, condenses with a condenser, and evaporates the obtained liquid-phase refrigerant with the evaporator. Thus, a centrifugal chiller that cools an object to be cooled with its heat of vaporization, wherein the compressor is a single-stage centrifugal type, and the condenser is outside the compressor, and is axially connected to the compressor. It arrange | positions in the position superposed | polymerized seeing from radial direction. This turbo refrigerator also eliminates the need for a scroll for collecting the evaporated refrigerant and a connecting pipe for guiding the collected vapor refrigerant to the condenser. As a result, a reduction in efficiency of the refrigerator can be suppressed, and the condenser is provided using the space around the compressor, so that the entire refrigerator can be reduced in size by saving space.

  In this invention, it can be set as the structure by which the said evaporator is arrange | positioned at the outer peripheral side of the drive device which drives the said compressor. According to this structure, there exists an advantage which can cool a drive machine with an evaporator.

  In the present invention, the evaporator may be arranged on one side in the axial direction of the compressor, and the drive unit that drives the compressor may be arranged on the other side. According to this configuration, it is possible to prevent the adverse effect that the evaporator is heated by the heat generated by the drive unit.

  In the present invention, it is preferable that at least the evaporator, the compressor, and the condenser are housed in a housing. In the present invention, since the condenser is arranged in the vicinity of the periphery of the compressor, the connection pipe for leading the vapor refrigerant flowing out from the compressor to the condenser after collecting the scroll by the scroll becomes unnecessary. The compressor and the condenser can be accommodated in the housing, resulting in a compact structure.

  In the configuration in which the evaporator, the compressor, and the condenser are housed in the housing, it is preferable that a return passage for returning the liquid phase refrigerant from the condenser to the evaporator is disposed in the housing. Since the return passage through which the liquid refrigerant having a small volume flow rate flows has a small diameter, the refrigerator can be made more compact by disposing the return passage inside the housing.

  According to the turbo chiller of the present invention, the condenser is arranged outside the latter stage of the compressor at a position where the condenser is seen from both the latter stage and the axial direction and the radial direction. Since the vapor refrigerant that flows out radially from the impeller is directly supplied to the condenser without going through the scroll or connecting pipe, the scroll and connecting pipe between the compressor and the condenser are not required and the refrigeration is performed. Reduction in machine efficiency can be suppressed. Further, since the condenser is provided by effectively using the space around the rear stage of the compressor, the entire refrigerator can be reduced in size by saving space.

It is a schematic block diagram which shows the operating principle of the turbo refrigerator which concerns on 1st Embodiment of this invention. It is a longitudinal cross-sectional view of a turbo refrigerator same as the above. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is sectional drawing which shows the modification of the turbo refrigerator of FIG. It is sectional drawing which shows the further another modification of the turbo refrigerator of FIG. It is a longitudinal section showing a turbo refrigerator concerning a 2nd embodiment of the present invention. It is a longitudinal cross-sectional view which shows the turbo refrigerator based on 3rd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the turbo refrigerator based on 4th Embodiment of this invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a turbo refrigerator according to a first embodiment of the present invention. In this embodiment, water is used as a liquid refrigerant. The turbo chiller evaporates a liquid refrigerant (water) R3 in the evaporator 1 while being sprayed on the heat transfer tube 5 from above, and the cooling target (hereinafter referred to as the cooling target) flowing in the heat transfer tube 5 with the heat of vaporization. Takes heat from W1 (called cold water). The low-pressure vapor refrigerant R1 is sucked and compressed by a turbo compressor 2 that is rotationally driven by a drive unit 3 such as an electric motor, so that the high-pressure vapor refrigerant R2 is sent to the condenser 4 . The vapor refrigerant R2 is supplied to the evaporator 1 after being dissipated in the waste heat object (hereinafter referred to as cooling water) W2 flowing in the cooling pipe 6 in the condenser 4 to form a liquid refrigerant R3. The

  In this turbo chiller, water having a higher boiling point is used as a refrigerant compared with conventional refrigerant such as Freon, so the compressor 2 is, for example, 1/100 atm on the inflow side and the outflow side on the outflow side. Negative pressure operation is set at 1/10 atm. Therefore, since the density of the refrigerant decreases and the volume flow rate increases, the size of the refrigerant is increased as compared with a refrigerator using refrigerant such as Freon. Further, from the compressor 2, the vapor refrigerant R <b> 2 is supplied to the condenser 4. The chilled water W1 in the heat transfer tube 5 is, for example, cooled from 12 ° C. to 7 ° C. by the evaporator 1 and sent out, and is used for indoor cooling of a building or the like. The cooling water W2 in the cooling pipe 6 takes heat from the vapor refrigerant R2 in the condenser 4, for example, and is sent to the cooling tower at a temperature of 32 ° C. to 37 ° C.

  In FIG. 2 showing a longitudinal sectional view of the turbo chiller, a housing 8 serving as an exterior body has a structure in which an upper opening of a bottomed cylindrical housing body 9 is sealed with a housing lid body 10. Main components including the evaporator 1, the compressor 2 and the condenser 4 are accommodated in a housing 8. The housing 8 and the compressor 2 are arranged concentrically. An electric motor 3 that drives the compressor 2 is disposed at the bottom of the housing 8 and is directly connected to the rotating shaft 11 of the compressor 2. One end portion (upper end portion) of the rotating shaft 11 is rotatably supported by the rear end wall 17 of the housing lid body 10 via the bearing 12, and the other end portion is supported by the bottom plate portion 9 a of the housing body 9 via the bearing 13. Is supported rotatably.

  An annular evaporator 1 is provided on the bottom plate portion 9 a of the housing body 9 so as to surround the motor 3. The motor 3 is supported by the housing body 9 by fixing a ring-shaped mounting plate 18 fitted and fixed to the motor 3 to the inner surface of the peripheral wall of the housing body 9 via a plurality of radial stays 19. . The outer periphery of the front inlet side (lower side) of the casing 14 of the compressor 2 and the housing 8 are connected by a front partition wall 15A, and the outer periphery of the rear inlet side (upper side) of the casing 14 and the housing 8 are connected. Are connected by a rear partition wall 15B. The vapor refrigerant R1 from the evaporator 1 receives the suction force generated by the compressor 2 and passes from between the stays 19 to the compressor 2 through a passage between the mounting plate 18 and the front partition wall 15A. Inhaled.

  The compressor 2 is a two-stage centrifugal type in which a lower compressor front stage 2F and an upper compressor rear stage 2R are arranged back to back, and the compressor front stage 2F includes a front impeller (impeller) 20, The compressor rear stage 2R is also constituted by a rear stage impeller (impeller) 22 and a rear stage diffuser 23 concentrically arranged on the outer side in the radial direction R. Yes.

  The front stage impeller 20 sucks the vapor refrigerant R1 from the evaporator 1 upward along the axial direction S of the rotating shaft 11 from the inlet portion, causes the fluid to flow outward in the radial direction R, and radially from the outer peripheral outlet. Let it flow out. The vapor refrigerant R21 flowing out from the front stage impeller 20 flows toward the peripheral wall of the housing body 9 through the front stage diffuser 21. The vapor refrigerant R21 that exits the front diffuser 21 is formed between the drum-shaped passage inner wall 16 and the peripheral wall of the housing body 9, and between the rear partition wall 15B and the rear end wall 17 behind the intermediate passage 24. And flows toward the rear stage 2R of the compressor. An intermediate cooler 28 formed of an annular heat exchanger is disposed between the rear partition wall 15B and the rear end wall 17, and the vapor refrigerant R21 is cooled by the intermediate cooler 28 when passing through the intermediate passage 24. Is done. For example, water is used as the refrigerant of the intercooler 28.

  The vapor refrigerant R22 flowing out of the intercooler 28 is sucked downward along the axial direction S of the rotary shaft 11 from the inlet of the rear impeller 22, and is directed radially outward from the outlet on the outer periphery of the rear impeller 22. Leaked. The vapor refrigerant R2 flowing out from the rear stage impeller 22 flows toward the peripheral wall of the housing body 9 through the rear stage diffuser 23, and flows out from an annular outlet 29 provided inside the casing 14. The condenser 4 is disposed in an annular space 30 provided between the rear-stage diffuser 23 and the rear-stage partition wall 15B, and the vapor refrigerant R2 that has exited the outlet 29 flows into the condenser 4. In the condenser 4, the vapor refrigerant R2 is liquefied. The refrigerant R3 that has become liquid returns to the evaporator 1 through the return passage 31 formed of a pipe having a small diameter shown in FIG. The return passage 31 is disposed in the housing 8 and penetrates the front-stage diffuser 21 and the rear-stage diffuser 23 in the axial direction S. The return passage 31 may be disposed so as to pass outside the housing 8.

  In the above configuration, the condenser 4 is positioned outside the compressor rear stage 2R and overlaps with the compressor rear stage 2R when viewed from the axial direction S and the radial direction R, that is, radially outside the rear impeller 22 of the compressor rear stage 2R. Therefore, the vapor refrigerant R2 flowing out of the rear impeller 22 of the compressor 2 can be directly and smoothly guided to the condenser 4 via the rear diffuser 23. Thereby, both the scroll for collecting the refrigerant R2 flowing out from the latter stage of the compressor of the conventional two-stage centrifugal compressor and the long connecting pipe for guiding the collected vapor refrigerant to the condenser become unnecessary. As a result, the pressure loss that has occurred in the scroll and the connecting piping is eliminated, so that a reduction in efficiency of the refrigerator can be suppressed.

  In addition, since the position near the radially outer side of the rear impeller 22 in the rear stage 2R of the compressor is a large dead space in the conventional turbo refrigerator, by utilizing this place for the installation location of the condenser 4, By reducing the space, the entire refrigerator can be reduced in size. In particular, since this turbo chiller uses water with a high boiling point as a refrigerant and operates at a low pressure and the density is reduced, it is necessary to use the compressor 2 having the impellers 20 and 22 having a relatively large diameter. Since the rear stage 2R of the compressor composed of the rear stage impeller 22 and the rear stage diffuser 23 has a large space outside as viewed in the axial direction S and radial direction R, the condenser 4 can be easily placed in this large space. Can be installed.

  As shown in FIG. 2, in this embodiment, the entire condenser 4 is superposed on the compressor rear stage 2R including the rear stage impeller 2 and the rear stage diffuser 23. On the other hand, it is good also as an arrangement | positioning with which other parts of the condenser 4 except the axial rear part (upper part of FIG. 2) of the condenser 4 superpose | polymerize. In addition, the compressor front stage 2F composed of the front stage impeller 20 and the front stage diffuser 21 and the annular space 32 existing at the position where the polymerization is seen when viewed from the axial direction S and the radial direction R are also part or all of the evaporator 1 here. It can also be used effectively by installing.

  Further, since the condenser 4 is disposed between the intermediate passage 24 and the rear impeller 22 of the compressor rear stage 2R, the vapor refrigerant R2 flowing out from the compressor rear stage 2R in the axial direction rearward is discharged from the compressor front stage 2F. The refrigerant can be supplied to the condenser 4 without crossing the intermediate passage 24 that guides the vapor refrigerant R21 to the rear stage 2R of the compressor. Therefore, the passage connecting the compressor rear stage 2R and the condenser 4 is short and has a simple shape.

  In addition, since the vapor refrigerant R21, which has been compressed in the upstream stage 2F of the compressor and increased in temperature, is supplied to the downstream stage 2R of the compressor after being cooled by the intermediate cooler 28, the compression efficiency of the compressor 2 is improved. Furthermore, as described above, the scroll downstream of the rear stage 2R of the compressor and the connecting piping are not required, so that main components including the evaporator 1, the compressor 2 and the condenser 4 can be accommodated in the housing 8. It becomes a compact structure. Further, a pipe having a small diameter can be disposed inside the housing 8 as the return passage 31 for returning the liquid refrigerant R3 having a small volume flow rate from the condenser 4 to the evaporator 1, and this also allows a more compact structure. Become.

  Since the evaporator 1 is arranged on the outer peripheral side of the driving machine 3 that drives the compressor 2, the driving machine 3 can be cooled by absorbing the radiant heat from the driving machine 3 by the relatively low temperature evaporator 1. .

  The condenser 4 is not limited to the annular shape shown in FIG. 3, and as shown in FIG. 4, two condensers 4 having a rectangular parallelepiped shape or an arc shape are provided in an arrangement opposite to each other in the radial direction of the rear impeller 22. May be. In addition, as shown in FIG. 5, four cube-shaped condensers 4 may be provided on the concentric circles outside the rear impeller 22 at an angular interval of 90 °.

  FIG. 6 shows a turbo refrigerator according to a second embodiment of the present invention. The turbo chiller is different from that of the first embodiment only in the configuration in which the electric motor 3 that drives the compressor 2 is disposed above the compressor 2 and separated from the evaporator 1. is there. In this embodiment, there exists an advantage which can prevent the bad influence by which the evaporator 1 is heated by the heat generated by the electric motor 3.

  FIG. 7 shows a turbo refrigerator according to a third embodiment of the present invention. This turbo refrigerator includes a two-stage centrifugal compressor 33 provided in a series arrangement in which the impellers 20 and 22 of the compressor front stage 2F and the post-compression stage 2R are in the same direction. The evaporator 1 is disposed on the upper side of the compressor 33, and the electric motor 3 is disposed on the radially inner side of the evaporator 1. The refrigerant vapor R21 that has passed through the front-stage diffuser 21 from the front-stage impeller 20 is guided to the inlet of the rear-stage impeller 22 through a crossover-shaped intermediate passage 34 that turns back at an angle of 180 °. The condenser 4 is arranged in a position near the outside in the radial direction of the rear stage impeller 22 of the rear stage 2R of the compressor, and at a position where both are superposed with respect to the rear stage 2R of the compressor when viewed from the axial direction S and the radial direction R.

  Thereby, compared with the conventional turbo refrigerator of this type, the vapor refrigerant R2 flowing out from the rear impeller 22 can be directly and smoothly supplied to the condenser 4 without going through the scroll and the long connection pipe. The pressure loss that has occurred in the scroll and the connecting piping is eliminated, and a reduction in efficiency of the refrigerator can be suppressed. Moreover, by providing the condenser 4 by effectively using the space around the rear impeller 22, it is possible to eliminate the dead space and save space, and to achieve downsizing of the entire refrigerator.

  In this series-arranged compressor 33, since the compressor front stage 2F and the compressor rear stage 2R are both facing forward, the intermediate passage 34 connecting the compressor front stage 2F and the compressor rear stage 2R, and the compressor rear stage The problem existing in the back-to-back two-stage centrifugal compressor that the passage connecting the 2R to the condenser 4 does not exist originally.

  FIG. 8 shows a turbo refrigerator according to a fourth embodiment of the present invention. This turbo refrigerator includes a single-stage centrifugal compressor 38 having only a single impeller 39 and a diffuser 40. The condenser 4 is disposed on the radially outer side of the impeller 39 of the compressor 38 at a position where the compressor 38 overlaps the compressor 38 when viewed in the axial direction S and the radial direction R. Therefore, also in this turbo chiller, the vapor refrigerant R2 can be directly and smoothly supplied to the condenser 4 without going through the conventional scroll and connection piping, so the pressure loss that has occurred in the scroll and connection piping is eliminated. Reduction in efficiency of the refrigerator can be suppressed. Further, by providing the condenser 4 using the space around the impeller 39, the dead space can be eliminated and the space can be saved, and the entire refrigerator can be reduced in size.

  In each of the above-described embodiments, the vertical type in which the rotary shaft 11 of the compressors 2, 33, 38 is oriented in the vertical direction is described as an example. The present invention can also be applied to a horizontal type in which the rotation shaft 11 is oriented in the horizontal direction. Moreover, the structure of FIG. 6 which has arrange | positioned the evaporator 1 and the electric motor 3 on the opposite side on both sides of the compressor 2 is applicable also to 3rd Embodiment of FIG. 7, and 4th Embodiment of FIG. Furthermore, the electric motor 3 that drives the compressors 2, 33, and 38 may be provided outside the housing 8. A speed increaser (gear) may be interposed between the electric motor 3 and the compressors 2, 33 and 38.

  Further, the present invention is not limited to the contents shown in the above embodiment, and various additions, modifications, or deletions are possible within the scope not departing from the gist of the present invention. It is included within the scope of the present invention.

1 Evaporator 2, 33, 38 Turbo compressor 2F Compressor front stage 2R Compressor rear stage 3 Electric motor (drive machine)
4 Condenser 8 Housings 24, 34 Intermediate passage 28 Intermediate cooler 31 Return passages R1, R2 Vapor refrigerant (vapor phase refrigerant)
R3 Liquid refrigerant (liquid phase refrigerant)
W1 Cold water (cooling object)
S Axial direction R Radial direction

Claims (9)

Turbo that cools the object to be cooled with the heat of vaporization by compressing the gas-phase refrigerant from the evaporator with a turbo compressor, condensing with the condenser, and evaporating the obtained liquid-phase refrigerant with the evaporator A freezer,
The compressor is a back-to-back two-stage centrifugal type,
The condenser is a turbo chiller disposed outside the latter stage of the compressor at a position where it is superposed with the latter stage of the compressor when viewed in the axial direction and the radial direction.   2. The turbo refrigerator according to claim 1, wherein the condenser is disposed between an intermediate passage for introducing a refrigerant from the front stage of the compressor to the rear stage of the compressor and the second stage of the compressor.   3. The turbo refrigerator according to claim 1, wherein an intermediate cooler that cools the refrigerant guided from the front stage of the compressor to the rear stage of the compressor is disposed behind the condenser. 4. Turbo that cools the object to be cooled with the heat of vaporization by compressing the gas-phase refrigerant from the evaporator with a turbo compressor, condensing with the condenser, and evaporating the obtained liquid-phase refrigerant with the evaporator A freezer,
The compressor is a multi-stage centrifugal type having two or more stages,
The condenser is a turbo refrigerator disposed outside the last stage of the compressor and at a position where the condenser is superposed on the last stage of the compressor when viewed in the axial direction and the radial direction. Turbo that cools the object to be cooled with the heat of vaporization by compressing the gas-phase refrigerant from the evaporator with a turbo compressor, condensing with the condenser, and evaporating the obtained liquid-phase refrigerant with the evaporator A freezer,
The compressor is a single-stage centrifugal type,
The condenser is a turbo refrigerator disposed outside the compressor at a position where it is overlapped with the compressor when viewed in the axial direction and the radial direction.   The turbo chiller according to any one of claims 1 to 5, wherein the evaporator is disposed on an outer peripheral side of a drive unit that drives the compressor.   The turbo refrigerator according to any one of claims 1 to 5, wherein the evaporator is disposed on one side in an axial direction of the compressor, and a drive unit that drives the compressor is disposed on the other side.   The turbo refrigerator according to any one of claims 1 to 5, wherein at least the evaporator, the compressor, and the condenser are housed in a housing.   9. The turbo refrigerator according to claim 8, wherein a return passage for returning liquid phase refrigerant from the condenser to the evaporator is disposed in the housing.

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