Daikin Industries Patente

A refrigeration cycle apparatus (100) includes a heat source heat exchanger (13) and a bridge circuit (40). The heat source heat exchanger (13) includes a refrigerant inlet pipe (13a), a refrigerant outlet pipe (13b), a plurality of refrigerant paths (61), a diverger (50), and a converger (70). The bridge circuit (40) always causes a refrigerant (R) to flow into the heat source heat exchanger (13) at the refrigerant inlet pipe (13a) and flow out of the heat source heat exchanger (13) at the refrigerant outlet pipe (13b). The plurality of refrigerant paths (61) is connected to a plurality of diverger pipes (56) of the diverger (50) and a plurality of converger pipes (75) of the converger (70). The number of the diverger pipes (56) is smaller than the number of the converger pipes (75).

A rotary compressor includes a shaft extending in a first direction, a motor to drive the shaft, a first bearing including a discharge hole to discharge a compressed refrigerant, and supporting the shaft, a cylinder including a cylinder chamber formed inside the cylinder, a roller to eccentrically rotate in the cylinder chamber, and a muffler disposed so as to cover the discharge hole, wherein the motor, the muffler, the first bearing, and the cylinder are arranged in stated order along the first direction, the first bearing includes a boss which supports the shaft and protrudes toward the muffler, the muffler includes an opening through which the boss is disposed, and the first bearing or the muffler includes one or more positioning structures to determine a position of the muffler with respect to the first bearing such that clearance in the opening is formed along an entire periphery of the boss.

The rotary compressor (1) includes a drive shaft (31), a compression mechanism (30) for a refrigerant, and a casing (10). The compression mechanism (30) has a bearing (41) fixed to the casing (10) by a fixture member (44). The fixture member (44) has a first plate portion (44a) above the bearing (41), and the fixture member (44) and the compression mechanism (30) have a flow path for a fluid. The flow path includes a fluid inlet (44d) including a first plate portion (44a), a wall surface (41k) below the fluid inlet (44d), a first space (P1) between the fluid inlet (44d) and the wall surface (41k), a second space (P2) which is positioned below the fixture member (44) and shifted from the first space (P1) in a radial direction and/or a circumferential direction and through which the fluid that has collided with the wall surface (41k) flows, and a fluid outlet (41j) below the second space (P2).

The displacement volume of a compression mechanism (40) is defined as Vc [cc], the density of a refrigerant at 1.9 Mpa and 75°C as Dg [g/cm<3>], the number of revolutions of a rotary shaft (30) as N [rps], the volume of a primary space (S1) as V1 [cc], the volume of a secondary space (S2) as V2 [cc], the height of the primary space (S1) as H1 [cm], the height of the secondary space (S2) as H2 [cm], the density of refrigerating machine oil at 15°C as Do [g/cm<3>], and the solution viscosity of the refrigerating machine oil present at a level of a suction port (71a) or lower as η [mPa·S]. The rotary compressor satisfies relational expressions: N ≥ 100 [rps]; and ((8.19 × 10<-8> × Vc × Dg + 0.000327) × Vc<3.657> × N<3.126>)/(V1 × V2 × H1<1.867> × H2<1.556> × Do × η) ≤ 1.0. <img class="EMIRef" id="9bc56977-2269-4b63-9ad7-c8054ca75a0e-ia01" />

An injection flow path (61) communicating with an injection pipe (9c) is formed in a first cylinder (31, 41), a middle plate (55), and a second cylinder (31, 41). The injection flow path (61) includes: a first flow path (61a) connected to the injection pipe (9c); a second flow path (61b, 61c) branching from the first flow path (61a) and communicating with a first cylinder chamber (S1, S2); and a third flow path (61b, 61c) branching from the first flow path (61a) and communicating with the second cylinder chamber (S1, S2).

In a rotary compressor, a cylinder (31, 41, 231, 241, 331) and a closing member (50, 55, 56, 250, 255, 256, 350, 356) are fixed to each other by a plurality of bolts (B) extending in an axial direction of a rotary shaft (90). The plurality of bolts (B) include: a first bolt (B1) between a suction pipe (14, 214a, 214b, 314) and a housing (33, 43) housing a blade (38, 48) as viewed in the axial direction; and a second bolt (B2) between the housing (33, 43) and an imaginary line (IL), which is symmetrical to a center line (AL) of the suction pipe (14, 214a, 214b, 314) with respect to the housing (33, 43), as viewed in the axial direction.

A first cylinder (31) is provided with a first valve housing portion (31j) recessed from the inner peripheral surface toward the outer side and housing a first reed valve (63) and a valve retainer (64). The valve retainer (64) has a first surface (64b) facing the first reed valve (63) and a second surface (64c) opposite to the first surface (64b). A center line (C1) extending in the longitudinal direction of the first reed valve (63) crosses an opening of the first valve housing portion (31j) that is close to the first cylinder chamber (S1). A first edge (31k) that is located on the opening of the first valve housing portion (31j) which is close to the first cylinder chamber (S1) and that is close to the valve attachment surface (31g) is located closer to the second surface (64c) of the valve retainer (64) than the valve attachment surface (31g) in a first direction orthogonal to the valve attachment surface (31g).

The first surface (51) includes a valve seat surface (58) that is in contact with the tip portion (72) of the reed valve (70) in a closed state and a groove (59) that is formed around the valve seat surface (58) and overlaps an outer edge (72a) of the tip portion (72) as viewed in a second direction. The first surface (51) has a contact surface (75) that is configured to be in contact with the movable portion (73) of the reed valve (70) in the closed state.

An injection mechanism (40) includes a valve chamber (50), a first flow path (42, 43) that allows an injection pipe (39) and the valve chamber (50) to communicate with each other and has an outflow port (44) facing the valve chamber (50), and a second flow path (45) that is located at one end of the valve chamber (50) in a first direction and allows the valve chamber (50) and a compression chamber (15b, 25b) to communicate with each other. An inner surface forming the valve chamber (50) includes a first surface (51) forming the outflow port (44), and an inner surface forming the first flow path (42, 43) includes a first inclined surface (47) that is continuous with the first surface (51) and is inclined toward one end in the first direction to approach the second flow path (45) as the first inclined surface (47) extends toward the first surface (51).

The reed valve (70) includes a base portion (71) fixed to the valve retainer (60), a tip portion (72) configured to open and close the outflow port (44), and a constricted portion (73) connecting the base portion (71) and the tip portion (72). The constricted portion (73) has a narrower width in a third direction orthogonal to the first direction and the second direction than the base portion (71). An inner side surface (53, 54) forming the valve chamber (50) is formed outside the constricted portion (73) in the third direction as viewed in the second direction. The valve retainer (60) has a side surface (61, 62) formed outside the constricted portion (73) in the third direction as viewed in the second direction.

The fastening member (80) includes a head (80a) and a shaft (80b) extending from the head (80a) in a second direction. The base portion (71) of the reed valve (70) has a first hole (83) through which the shaft (80b) of the fastening member (80) is inserted. The valve retainer (60) has a second hole (84) through which the shaft (80b) is inserted. The partitioning member (90) has a first space (81a) that is located outside the valve chamber (50) and houses the head (80a).

A refrigerant is a single component refrigerant composed of a hydrocarbon refrigerant, or a refrigerant mixture containing the hydrocarbon refrigerant. Refrigerating machine oil present at a level of a suction port (71a) or lower in an oil reservoir (35) has a solution viscosity η of 5.0 [mPa·s] or more.

A refrigerant compressor (10) uses carbon dioxide as a refrigerant. A casing (13) houses a crankshaft (25), a motor (21), and a compression mechanism (30). The crankshaft (25) is provided with, at a lower end portion thereof, an oil supply mechanism (38) having a suction port (39) through which oil stored in a lower end portion of the casing (13) is drawn. A displacement volume Vcc [cc] per rotation of the compression mechanism (30) and a distance L1 [mm] between the suction port (39) and a lower end of a member joined to the casing (13), among members constituting the compression mechanism (30), satisfy the following condition: L 1 / Vcc > 13 . <img class="EMIRef" id="5739c957-1320-495d-92b5-3d7afefa9609-ia01" />

An air composition adjustment device adjusts a composition of air in an internal space (5) of a container (1), the air composition adjustment device including a composition adjuster (200) that supplies, to the internal space (5), a gas to be treated having a composition different from a composition of external air generated by treating the external air, a control unit (110) that controls the composition adjuster (200), and a first pressure detector (170) that detects a pressure in the internal space (5), in which the composition adjuster (200) includes a conveyor (231a, 231b) that conveys the external air or the gas to be treated to the internal space (5), and the control unit (110) evaluates airtightness of the internal space (5) on the basis of a change in the pressure in the internal space (5) caused by operation of the conveyor (231a, 231b).

A turbo compressor includes an impeller including a hub and a blade provided on an outer peripheral surface of the hub, a shaft connected to the impeller, a bearing supporting the shaft, a casing accommodating the impeller, the shaft, and the bearing, and including a first surface facing the blade, a gap sensor provided in the casing and configured to detect a size of a gap between the impeller and the first surface, and a control unit configured to control the size of the gap based on the size of the gap detected by the gap sensor.

An air conditioner 1, which is a refrigeration apparatus, includes a compressor 21; an outdoor heat exchanger 22, which is a condenser; an expansion mechanism 23; an indoor heat exchanger 31, which is an evaporator; and a refrigerant circuit 10 configured to circulate a refrigerant and refrigerating machine oil. The expansion mechanism 23 includes an expansion valve including a metal part. The refrigerant contains a hydrocarbon having one to four carbon atoms. The refrigerating machine oil is polyalkylene glycol, and contains an acid scavenger in an amount of 0.1% by weight to 2.0% by weight relative to the refrigerating machine oil. A filling amount of a sulfur-based odor component relative to a filling amount of the refrigerant is 50 ppm by weight to 2,000 ppm by weight.

A stator (21) has a core (22), a coil (23), a first insulating portion (26), and a connecting portion (100). The coil (23) is a winding (23a) wound around each of teeth (25). The first insulating portion (26) is provided between the core (22) and the coil (23), and insulates the core (22) and the coil (23) from each other. The connecting portion (100) connects the first insulating portion (26) and the core (22). The connecting portion (100) is formed so that the coil (23) and the first insulating portion (26) can vibrate in the radial direction relative to the core (22).

A power conversion apparatus includes: a rectifier circuit configured to rectify AC power from a three-phase AC power source; an inverter circuit configured to modulate a voltage rectified by the rectifier circuit based on a carrier frequency, convert the rectified voltage back to a voltage of a predetermined frequency, and apply the voltage to a motor; a first capacitor provided between the rectifier circuit and the inverter circuit and having a capacitance satisfying predetermined conditions; and a composite coil provided between the three-phase AC power source and the first capacitor and having both common-mode inductance and normal-mode inductance. The coupling coefficient between the respective windings of the composite coil is 0.85 or more and less than 1. The carrier frequency is 17.7 kHz or higher.

To provide a heat exchanger capable of enhancing the flexibility of arrangement of a communication path that communicates with a flat tube. The liquid header (60) includes a first channel (A), a second channel (B), and a third channel (C) that are connected to each other at a branch portion (65c), the second channel (B) is located on a front side with respect to the branch portion (65c) in a front-rear direction and includes a second main channel (B2) extending along the up-down direction, a second connection channel (B 1) that connects an end portion of the second main channel (B2) and the branch portion (65c), and a plurality of second liquid flow division openings (64b) that connects the second main channel (B2) and the plurality of flat tubes (28), and the third channel (C) is located on a rear side with respect to the branch portion (65c) in the front-rear direction, and includes a third main channel (C2) extending along the up-down direction, a third connection channel (C1) that connects an end portion of the third main channel (C2) and the branch portion (65c), and a plurality of third liquid flow division openings (64c) that connects the third main channel (C2) and the plurality of flat tubes (28).

A heat exchanger unit (40) includes a plate structure (62) in which a connection flow path (75) is formed. The connection flow path (75) has a first portion (80), a second portion (85), and a third portion (90). The first portion (80) communicates with all inner flow paths (50a) of a first heat transfer tube (51). The second portion (85) communicates with all inner flow paths (50a) of a second heat transfer tube (52). One end of the third portion (90) is connected to a first long side (81a), one of the long sides of the first portion (80). The other end of the third portion (90) is connected to a second long side (86b), one of the long sides of the second portion (85).

Suppose a position of the rotor (31) in a circumferential direction where magnetic flux generated by a magnet (33) reaches its maximum is a first position (PI), and an imaginary straight line passing the first position (P1) and a rotation axis (O) is a magnetic pole centerline (CL), at least a portion of the magnet (33) or a rotor core (32) is asymmetrical with respect to the magnetic pole centerline (CL) as viewed from an axial direction. A position of the rotor (31) in the circumferential direction where magnetic resistance reaches its maximum, which is a second position (P2), is shifted backward from the first position (P1) in a rotation direction of the rotor (31).

A hot water supply unit includes: a refrigerant unit (U) including a refrigerant circuit (R1) that performs a refrigeration cycle using a first refrigerant that is a flammable refrigerant; a tank (41) configured to store water directly or indirectly heated by the first refrigerant; and a casing (60) disposed in the indoor space (I) and configured to house the refrigerant unit (U) and the tank (41). The refrigerant unit (U) is disposed below the tank (41).

A rotary compressor includes: a casing (16) that forms a first space (Si) in which a refrigerant at a suction pressure flows; an electric motor (10) disposed in the first space (Si); a drive shaft (70) that is rotated about its axis; and a compression mechanism (15) that compresses the refrigerant in the first space (Si) and discharges the compressed refrigerant from a discharge port (24, 29). The casing (16) forms the oil reservoir (85) that stores the refrigerating machine oil and the high-pressure gas space (HS) into which the refrigerant discharged from the discharge port (24, 29) flows and which communicates with the vane chambers (48, 49). The oil separation mechanism (82) that separates the refrigerant and the refrigerating machine oil discharged from the discharge port (24, 29) from each other is disposed in the high-pressure gas space (HS).

A refrigeration apparatus includes a refrigerant unit (U) that includes a first refrigerant circuit (R1) configured to perform a refrigeration cycle by using a first refrigerant, which is a highly flammable refrigerant, in which the first refrigerat circuit (R1) includes a first refrigerant pipe (27a) that is configured to connect a first heat exchanger (23) and a decompression mechanism (24) to each other, a second refrigerant pipe (27b) that is configured to connect the decompression mechanism (24) and a second heat exchanger (22) to each other, a third refrigerant pipe (27c) that is configured to connect the second heat exchanger (22) and a compressor (21) to each other, and a fourth refrigerant pipe (27d) that is configured to connect the compressor (21) and the first heat exchanger (23) to each other, and in which the first to fourth refrigerant pipes (27a to 27d) have structures in which a first capacity, which is a sum of a capacity of the first refrigerant pipe (27a) and a capacity of the second refrigerant pipe (27b), is smaller than a second capacity, which is a sum of a capacity of the third refrigerant pipe (27c) and a capacity of the fourth refrigerant pipe (27d).

A first switching mechanism (15) is switchable between a first state in which a discharge side of a first compressor (11) is connected to a first water heat exchanger (14) or a refrigerant heat exchanger (30) and a second state in which the discharge side of the first compressor (11) is connected to a heat source heat exchanger (12). In a defrosting operation for defrosting the heat source heat exchanger (12), a control unit (100) drives the first refrigerant circuit (10) with the first switching mechanism (15) set in the second state.

The indoor unit is a wall-mounted indoor unit of an air conditioner. The indoor unit includes a heat exchanger, a refrigerant detection sensor, a partitioning member, and an auxiliary pipe. The heat exchanger is disposed in a first space. The refrigerant detection sensor is disposed in a second space. The partitioning member partitions the first space and the second space. The auxiliary pipe is disposed to extend from the first space to the second space across the partitioning member. One end of the auxiliary pipe is connected to the heat exchanger in the first space, and the other end of the auxiliary pipe is located in the second space.

An air conditioner (1) includes an indoor unit (2) and an outdoor unit (3). The indoor unit (2) includes a first heat exchanger (20). The outdoor unit (3) includes a second heat exchanger (30). The first heat exchanger (20) includes a first flat tube (21) including a first base material (212) and a first surface layer (213), and a first fin (22). The first fin (22) is joined to the first flat tube (21). The second heat exchanger (30) includes a second flat tube (31) including a second base material (312) and a second surface layer (313), and a second fin (32). The second fin (32) is joined to the second flat tube (31). A potential increases in the order of the first surface layer (213), the first fin (22), and the first base material (212), a potential increases in the order of the second fin (32), the second surface layer (313), and the second base material (312).

A refrigeration apparatus (1) includes a refrigerant circuit (10), wherein tetrahydrothiophene, as an odor component, is sealed in the refrigerant circuit (10) along with a refrigerant and a refrigerating machine oil, and following Formula (1) is satisfied, where an amount of leakage of the refrigerant that leaks from the refrigerant circuit (10) at a leakage rate of 0.001 kg/h for four minutes is referred to as M<leak1> [kg], a fill amount of the odor component into the refrigerant circuit (10) is referred to as M<od> [kg], a fill amount of the refrigerating machine oil is referred to as M<oil> [kg], solubility of the odor component in the refrigerating machine oil is referred to as S<oil> [weight ppm], a fill amount of the refrigerant into the refrigerant circuit (10) is referred to as M<ref> [kg], a volume of a room (LS) is referred to as V [m<3>], and a density of the odor component is referred to as ρ [kg/m<3>]. [Formula 1] 1 > M leak 1 × M od − M oil × S oil / M ref 0.25 × V × ρ <img class="EMIRef" id="47e9cd3b-fd97-46d5-a8ba-803150d14fef-ia01" />

A heat source unit (10) includes a casing (50), a vertical partition plate (70), a compressor (11), and a heat source fan (14). The casing (50) has a bottom plate (52) and an internal space (S). The vertical partition plate (70) partitions the internal space (S) into a fan chamber (S3) and a machine chamber (S4). The compressor (11) is disposed in the machine chamber (S4) and compresses a refrigerant (R). The heat source fan (14) is disposed in the fan chamber (S3). The bottom plate (52) has a machine chamber wall (526). The machine chamber wall (526) extends upward from a peripheral edge of a machine chamber bottom surface portion (522). The vertical partition plate (70) has a partition opening (75). The partition opening(75) allows the fan chamber (S3) and the machine chamber (S4) to communicate with each other. A height (H2) of a lower end (75L) of the partition opening (75) is lower than a height (H0) of the machine chamber wall (526).

A screw compressor includes a compression mechanism including a screw rotor and configured to compress a refrigerant, a motor configured to rotate the screw rotor and including a coil and a stator core, an inverter configured to supply electric power to the motor and to be cooled by a liquid refrigerant, and a casing including a suction chamber configured to receive the refrigerant from outside, a rotor chamber configured to accommodate the compression mechanism, and a motor chamber configured to accommodate the motor and located between the suction chamber and the rotor chamber, wherein the liquid refrigerant that has cooled the inverter is supplied to one or more coil ends of the coil or the stator core.

A rotary compressor includes: a casing (11); a cylinder (41, 42) disposed inside the casing; a piston (61, 62) configured to eccentrically rotate inside the cylinder; a shaft (81) coupled to the piston (61, 62) and having a cavity (81a) therein; piping (85, 185, 285, 385) disposed inside the cavity (81a) and spaced apart from a wall of the cavity (81a); an upper bearing (32) disposed over the cylinder and configured to rotatably support the shaft; a lower bearing (31) disposed under the cylinder and configured to rotatably support the shaft; a rear muffler (34) disposed under the lower bearing; and a positive displacement pump (50) attached to the rear muffler and configured to discharge oil between the piping and the wall.

A technique by which the performance of a closed impeller of a centrifugal compressor can be improved is provided. A compressor 10 according to an embodiment of the present disclosure includes an impeller 200, and a casing 100 configured to house the impeller 200. The impeller 200 includes a hub 210 having a meridional plane 211, a plurality of blades 220 provided on the meridional plane 211, and a shroud 230 provided on tips of the plurality of blades 220 so as to cover the meridional plane 211. The shroud 230 has a first passage 235 penetrating between an inner surface of the shroud 230 facing the meridional plane 211 and an outer surface of the shroud 230 facing an inner surface of the casing 100. The first passage 235 has a first opening 235B in the outer surface of the shroud 230 and a second opening 235A in the inner surface of the shroud 230. In a cross section including an axis AX of a rotating shaft 250 of the impeller 200, the first passage 235 is inclined such that a center 235Bc of the first opening 235B is located on an inlet 200in side of the impeller 200 relative to a center 235Ac of the second opening 235A.

Providing a refrigeration cycle apparatus capable of suppressing liquid compression. An air conditioner includes a first refrigerant circuit, a second refrigerant circuit, and a control device. The first refrigerant circuit includes a first compressor, a first heat exchanger functioning as a radiator during cooling operation, a first expansion valve, and a second heat exchanger functioning as a heat absorber during the cooling operation. The second refrigerant circuit c a portion between the first compressor and the first heat exchanger and a portion between the first heat exchanger and the first expansion valve. The second refrigerant circuit includes a second compressor and a first valve. The first valve is disposed on an upstream side of the second compressor. The control device controls the first compressor, the second compressor, the first expansion valve, and the first valve. The control device closes the first valve when the second compressor is to be stopped.

A rotary compressor includes: a casing; cylinders disposed inside the casing; pistons configured to eccentrically rotate inside the cylinders; a shaft connected to the pistons and including a cavity; a pipe disposed inside the cavity and apart from a wall of the cavity; an upper bearing disposed over the cylinders and configured to pivotally support the shaft; a lower bearing disposed below the cylinders and configured to pivotally support the shaft; a rear muffler disposed below the lower bearing; and a positive displacement pump attached to the rear muffler and configured to discharge oil into the pipe.

A screw compressor includes a compression mechanism including a screw rotor and configured to compress a refrigerant; a rotation shaft to which the screw rotor is fixed; a motor configured to rotate the rotation shaft; and a casing having a suction chamber configured to introduce the refrigerant from outside, a rotor chamber configured to house the compression mechanism, and a motor chamber configured to house the motor and positioned between the suction chamber and the rotor chamber, wherein the rotation shaft includes a first flow path that communicates with the suction chamber and that extends along a first direction that is an axial direction; and a second flow path that communicates with the motor chamber and the first flow path and that extends along a second direction intersecting the first direction.

A rotary compressor including: a casing; a cylinder disposed inside the casing; a piston configured to eccentrically rotate inside the cylinder; a hollow shaft coupled to the piston and having an internal space; an upper bearing disposed over the cylinder and configured to rotatably support the shaft; a lower bearing disposed under the cylinder and configured to rotatably support the shaft; a rear muffler disposed under the lower bearing; and a positive displacement pump attached to the rear muffler and configured to discharge oil into the internal space.

To provide a refrigeration cycle apparatus capable of performing efficient operation even under a low-load condition. An air conditioner (100) includes a first refrigerant circuit (110), a second refrigerant circuit (120), a bypass flow path (130), and a bypass valve (132). The first refrigerant circuit includes a first compressor (10), a radiator (40), a first expansion valve (50), and a heat absorber (60). The second refrigerant circuit connects a portion between the first compressor and the radiator and a portion between the radiator and the first expansion valve to each other and includes an economizer (70), a first valve (80), and a second compressor (20). The economizer is disposed between the radiator and the heat absorber, and the second compressor sucks a refrigerant that has passed through the economizer. The bypass flow path connects a portion between the first valve and the second compressor and a portion between the heat absorber and the first compressor. The bypass valve is disposed in the bypass flow path. The second compressor is a compressor that is smaller in displacement than the first compressor.

A refrigeration cycle apparatus with which highly efficient operation is possible has been demanded. An air conditioner (100) includes a first refrigerant circuit (110) and a second refrigerant circuit (120). The first refrigerant circuit includes a first compressor (10), a first heat exchanger (40) functioning as a radiator for a refrigerant, a first expansion valve (50), and a second heat exchanger (60) functioning as a heat absorber for the refrigerant. The second refrigerant circuit connects a portion between the first compressor and the first heat exchanger and a portion between the first heat exchanger and the first expansion valve. The second refrigerant circuit includes a second compressor (20). Suction pressure of the first compressor is lower than suction pressure of the second compressor. The first compressor is a scroll compressor, and the second compressor is a rotary compressor. Alternatively, the first compressor is a scroll compressor having a first design compression ratio, and the second compressor is a scroll compressor having a second design compression ratio smaller than the first design compression ratio.

An outdoor unit (3) of an air conditioner (1) is provided with a blow-out grille (59) including a connecting rib (70) extending radially and a plurality of concentric annular ribs (80) intersecting the connecting rib (70). The annular ribs (80) include a first annular rib (81) and a second annular rib (82). In a direction orthogonal to an rotation axis (X1) of the fan (38), the first annular rib (81) is disposed in a first region (61), and the second annular rib (82) is disposed in a second region (62) located further toward the outer peripheral side of the blow-out grille (59) than the first region (61). In a cross-section including the rotation axis (X1), the first annular rib (81) is inclined in a direction further toward the rotation axis (X1) with increasing distance from the fan (38), and the second annular rib (82) is inclined in a direction further toward an outer periphery of the blow-out grille (38) than the first annular rib (81), with increasing distance from the fan (38).

With respect to a thrust magnetic bearing, a technology for appropriately holding an assembly of an insulating member and a coil in a groove portion of a core is provided. A thrust magnetic bearing 500 according to an embodiment of the present disclosure is a thrust magnetic bearing 500 for supporting a thrust load on a rotating shaft 250 of a compressor 10, the thrust magnetic bearing including an annular core 520 provided with a groove portion 521 having an annular opening 521A at an end face in an axial direction; and a coil assembly 530 including an annular insulating member 540 and a coil 550 wound around the insulating member 540, the coil assembly 530 being accommodated in the groove portion 521, wherein an outer diameter D2 of the opening 521A is shorter than an outer diameter d2 of the coil assembly 530 in a part of or an entirety of a circumferential direction, or an inner diameter D1 of the opening 521A is longer than an inner diameter d1 of the coil assembly 530 in a part of or an entirety of the circumferential direction.