Compressor and refrigeration device

Abstract

A compressor (100) includes a casing (10), a motor (20), a compression mechanism (40), an oil reservoir (14), a crankshaft (30), a rotary member (60), a first space (S1), a second space (S2), and a discharge pipe (17). The motor (20) includes a stator (21), a rotor (25), a refrigerant descending passage (54), and a refrigerant ascending passage (50). The rotary member (60) rotates together with the rotor (25) and has an outer diameter (X) larger than an inner diameter (Y) of the stator (21). The crankshaft (30) transmits rotation of the rotor (25) to the compression mechanism (40). The first space (S1) is formed between the compression mechanism (40) and the motor (20). The second space (S2) is formed between the motor (20) and the oil reservoir (14). The discharge pipe (17) is disposed in the first space (S1). The refrigerant descending passage (54) allows a refrigerant (R) to pass from the first space (S1) to the second space (S2). The refrigerant ascending passage (50) allows the refrigerant (R) to pass from the second space (S2) to the first space (S1).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a compressor and a refrigeration apparatus.BACKGROUND ART

[0002] In order to reduce the amount of a lubricating oil discharged to the outside of a compressor, in a compressor disclosed in Patent Literature 1 (JP 2021-017849 A), a dimension of a balance weight attached to a lower surface of a rotor of a motor and a relative position of the balance weight with respect to the other components are adjusted.SUMMARY OF THE INVENTION <Technical Problem>

[0003] A refrigerant located below the motor contains the lubricating oil. When the refrigerant in such a state reaches a discharge pipe of the compressor, the lubricating oil is discharged to the outside of the compressor. In order to reduce the discharge of the lubricating oil, it is desirable to optimize the structure of not only the balance weight but also a component group arranged near a lower portion of the motor so that the lubricating oil contained in the refrigerant is easily separated from the refrigerant.<Solution to Problem>

[0004] A compressor according to a first aspect includes a casing, a motor, a compression mechanism, an oil reservoir, a crankshaft, a rotary member, a first space, a second space, and a discharge pipe. The casing has an internal space. The motor includes a stator having a cylindrical shape, a rotor disposed in the stator, a refrigerant descending passage, and a refrigerant ascending passage. The motor is disposed in the internal space. The compression mechanism is disposed in the internal space and above the motor. A first space is formed between the compression mechanism and the motor. The compression mechanism compresses a refrigerant. The oil reservoir is disposed in the internal space and below the motor. A second space is formed between the oil reservoir and the motor. The crankshaft transmits rotation of the rotor to the compression mechanism. The rotary member rotates together with the rotor. The rotary member is disposed in the second space. The rotary member has a larger outer diameter than an inner diameter of the stator. The discharge pipe is disposed in the first space. The refrigerant descending passage allows the refrigerant to pass through from the first space to the second space. The refrigerant ascending passage allows the refrigerant to pass through from the second space to the first space.

[0005] In this configuration, the rotary member is positioned between the discharge pipe and the oil reservoir. Therefore, since the refrigerant ascending from the oil reservoir to the discharge pipe through the refrigerant ascending passage collides with the rotary member functioning as an obstacle to the refrigerant, the lubricating oil contained in the refrigerant is separated, and eventually, discharge of the lubricating oil from the compressor is suppressed.

[0006] A compressor according to a second aspect is the compressor according to the first aspect, in which the stator includes a stator core and a coil. The coil is formed by winding a conductive wire around the stator core. The refrigerant descending passage is a core cut formed on an outer periphery of the stator core. The rotary member is disposed lower than a lower end of the coil.

[0007] In this configuration, the refrigerant receives cyclone separation in the first space to separate a predetermined amount of lubricating oil, and then can descend to the second space through the core cut on the outer periphery. Subsequently, the refrigerant ascending from the second space adjacent to the oil reservoir to the coil gap of the motor collides with the rotary member disposed below the coil of the motor before reaching the coil gap of the motor, and thus separation of the lubricating oil from the refrigerant is further promoted. Since the proportion of the sectional area of the coil gap in the area through which the ascending refrigerant flow passes is large, the separation of the lubricating oil becomes efficient.

[0008] A compressor according to a third aspect is the compressor according to the second aspect, in which a height difference between the rotary member and the lower end of the coil is 20 mm or less.

[0009] In this configuration, the rotary member is disposed close to the lower end of the coil. Therefore, the rotary member can function as an obstacle to the refrigerant.

[0010] A compressor according to a fourth aspect is the compressor according to the second or third aspect, in which the stator further includes a lower insulator having an annular shape. The lower insulator is disposed on a lower surface of the stator core. The lower insulator has an outer peripheral wall extending downward from near an outer periphery of the lower insulator. The rotary member is disposed higher than a lower end of the outer peripheral wall.

[0011] In this configuration, the descending flow of the refrigerant passing through the core cut moves further downward than the outer peripheral wall disposed lower than the rotary member and then changes to an ascending flow. Therefore, the ascending flow of the refrigerant easily collides with the rotary member.

[0012] A compressor according to a fifth aspect is the compressor according to any one of the first to fourth aspects, in which the rotary member has a groove radially extending from a center toward a peripheral edge.

[0013] In this configuration, when the refrigerant moves near the rotary member, a part of the refrigerant flows in the groove and collides with a wall of the groove. Due to this collision, the lubricating oil contained in the refrigerant is absorbed by the oil film already attached to an inner surface of the groove. Therefore, the lubricating oil contained in the refrigerant is efficiently separated from the refrigerant.

[0014] A compressor according to a sixth aspect is the compressor according to any one of the first to fourth aspects, in which the rotary member has a plurality of grooves radially extending from a center toward a peripheral edge in a radial pattern.

[0015] In this configuration, a plurality of grooves having a function of separating the lubricating oil from the refrigerant is formed in the rotary member. Therefore, the lubricating oil contained in the refrigerant is more efficiently separated from the refrigerant.

[0016] A compressor according to a seventh aspect is the compressor according to any one of the first to sixth aspects, in which the rotor includes a rotor refrigerant passage. The rotor refrigerant passage penetrates the rotor in an axial direction. The rotor refrigerant passage allows the refrigerant to pass through from the second space to the first space. An air gap that allows the refrigerant to pass from the second space to the first space is formed between the stator and the rotor. The stator has a coil gap located between two of the coils adjacent. The coil gap allows the refrigerant to pass from the second space to the first space.

[0017] In this configuration, the ascending flow of the refrigerant passes through the rotor refrigerant passage, the air gap, and the coil gap. The rotary member interrupts the entire rotor refrigerant passage, the entire air gap, and at least a part of the coil gap in plan view. Therefore, a large proportion of the ascending flow of the refrigerant collides with the rotary member.

[0018] A compressor according to an eighth aspect is the compressor according to any one of the first to seventh aspects, in which the rotor includes a rotor body and a lower balance weight provided on a lower surface of the rotor body. The rotary member is fixed to the lower balance weight.

[0019] In this configuration, the rotor has the lower balance weight. Therefore, vibration during rotation of the rotor can be suppressed.

[0020] A compressor according to a ninth aspect is the compressor according to any one of the first to seventh aspects, in which the rotor includes a rotor body and a lower balance weight provided on a lower surface of the rotor body. The rotary member is fixed to the rotor body.

[0021] In this configuration, the rotary member is fixed to the rotor body. Accordingly, the rotary member can interrupt a central portion of the refrigerant ascending flow.

[0022] A compressor according to a tenth aspect is the compressor according to any one of the first to seventh aspects, in which the rotary member is fixed to the crankshaft.

[0023] In this configuration, the rotary member is fixed to the crankshaft. Therefore, the rotary member can interrupt the refrigerant ascending flow near the crankshaft.

[0024] A compressor according to an eleventh aspect is the compressor according to any one of the first to tenth aspects, in which the rotary member has at least one of a first opening communicating with the rotor refrigerant passage or a second opening communicating with the air gap.

[0025] In this configuration, the rotary member has the first opening or the second opening. Therefore, since a part of the ascending flow of the refrigerant can pass through any of the rotor refrigerant passage, the air gap, or the coil gap after passing through the first opening or the second opening, a required amount of the ascending flow of the refrigerant can be secured.

[0026] A refrigeration apparatus according to a twelfth aspect includes the compressor according to any one of the first to eleventh aspects.

[0027] In this configuration, the compressor includes the rotary member which functions as an obstacle to the refrigerant. Therefore, in the refrigerant circuit of the refrigeration apparatus, discharge of the lubricating oil from the compressor is suppressed.BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG. 1 is a circuit diagram showing a configuration of a refrigeration apparatus 101 according to a first embodiment. FIG. 2 is a sectional view showing a configuration of a compressor 100 according to the first embodiment. FIG. 3 is an enlarged schematic diagram of a main part of FIG. 2. FIG. 4 is a plan view of a stator core 22. FIG. 5 is a schematic diagram showing an upper surface or a cross section of a main part of the compressor 100. FIG. 6 is a schematic diagram showing a lower surface of a rotary member 60. FIG. 7 is an enlarged schematic diagram of a main part of FIG. 3. FIG. 8 is a sectional view of the rotary member 60. FIG. 9 is a schematic diagram showing a lower surface or a cross section of the main part of the compressor 100. FIG. 10 is an enlarged schematic diagram of the main part of the compressor 100 according to a second embodiment. FIG. 11 is a schematic diagram showing a lower surface of the rotary member 60 according to the second embodiment. DESCRIPTION OF EMBODIMENTS <First embodiment>(1) Configuration of refrigeration apparatus 101

[0029] FIG. 1 shows a configuration of a refrigeration apparatus 101 according to a first embodiment. The refrigeration apparatus 101 includes a heat source unit 90, a utilization unit 80, and a connection pipe group 85.

[0030] The heat source unit 90 functions as a heat source or a cold source for a refrigerant R. The heat source unit 90 includes a compressor 100, a four-way switching valve 92, a heat source heat exchanger 93, a heat source fan 94, an expansion valve 95, an accumulator 96, a liquid shutoff valve 97, and a gas shutoff valve 98.

[0031] The utilization unit 80 provides a user with heat or cold received from the refrigerant R. The utilization unit 80 includes a utilization heat exchanger 81 and a utilization fan 82.

[0032] The connection pipe group 85 connects the heat source unit 90 and the utilization unit 80. The connection pipe group 85 includes a liquid pipe 86 and a gas pipe 87. The liquid pipe 86 connects the liquid shutoff valve 97 and the utilization heat exchanger 81. The gas pipe 87 connects the gas shutoff valve 98 and the utilization heat exchanger 81.

[0033] The constituent components of the heat source unit 90, the constituent components of the utilization unit 80, and the connection pipe group 85 constitute a refrigerant circuit. The refrigerant circuit circulates the refrigerant R.

[0034] The compressor 100 mounted on the heat source unit 90 compresses a low-pressure gas refrigerant (that is, the refrigerant R having a low pressure and being in a gas state) to generate a high-pressure gas refrigerant (that is, the refrigerant R having a high pressure and being in a gas state).

[0035] In a case where the four-way switching valve 92 achieves the connection indicated by the solid line, the refrigeration apparatus 101 performs a cold utilization operation. At this time, the utilization heat exchanger 81 functions as an evaporator or a heat absorber, and provides the user with cold obtained from the refrigerant R. In a case where the four-way switching valve 92 achieves the connection indicated by the broken line, the refrigeration apparatus 101 performs a heat utilization operation. At this time, the utilization heat exchanger 81 functions as a condenser or a heat radiator, and provides the user with heat obtained from the refrigerant R.(2) Configuration of compressor 100

[0036] FIG. 2 shows a configuration of the compressor 100. The compressor 100 is a scroll compressor, and includes a casing 10, a motor 20, a crankshaft 30, a compression mechanism 40, a partitioning member 70, and a support 77.(2-1) Casing 10

[0037] The casing 10 includes a body 11, an upper lid 12, and a lower lid 13 that are airtightly joined together.

[0038] An internal space S exists in the casing 10. Components of the compressor 100, the refrigerant R, and a lubricating oil L exist in the internal space S.

[0039] An oil reservoir 14 for storing the lubricating oil L is provided near the lower lid 13. The oil reservoir 14 is disposed in the internal space S and below the motor 20.

[0040] The internal space S is divided into a first space S1, a second space S2, and a third space S3 by the components of the compressor 100. The first space S1 is formed between the compression mechanism 40 and the motor 20. The second space S2 is formed between the motor 20 and the oil reservoir 14. The third space S3 is formed above the compression mechanism 40.

[0041] A suction pipe 15 for sucking the low-pressure gas refrigerant is attached to the upper lid 12. A discharge pipe 17 for discharging the high-pressure gas refrigerant is attached to the body 11. The discharge pipe 17 is disposed in the first space S1.(2-2) Motor 20

[0042] The motor 20 is disposed in the internal space S. The motor 20 generates power for driving the compression mechanism 40 by using power supplied from the outside of the compressor 100. The motor 20 includes a stator 21 and a rotor 25. The stator 21 and the rotor 25 have a columnar or cylindrical shape having a common center axis C. The stator 21 is fixed to the body 11. The rotor 25 is disposed in a cavity in a central portion of the stator 21 and is rotatably supported.(2-3) Crankshaft 30

[0043] The crankshaft 30 transmits the power generated by the motor 20 to the compression mechanism 40. The crankshaft 30 includes a main shaft portion 31, an eccentric portion 32 eccentric to the main shaft portion 31, and an upper balance weight 37. The main shaft portion 31 shares the center axis C with the stator 21 and the rotor 25.

[0044] A part of the main shaft portion 31 passes through a cavity in a central portion of the rotor 25 and is fixed to the rotor 25. As a result, the crankshaft 30 rotates together with the rotor 25. The upper balance weight 37 is for balancing the crankshaft 30. Unlike the configuration of the present embodiment, the upper balance weight 37 may be configured as a member different from the crankshaft 30 and fixed to an upper surface of the rotor 25.

[0045] A main passage 35 for sucking up the lubricating oil L in the oil reservoir 14 is provided inside the crankshaft 30. The lubricating oil L sucked up to an upper end of the main passage 35 is used to lubricate the compression mechanism 40. Furthermore, the main passage 35 communicates with a plurality of branch passages 36 extending in a radial direction of the crankshaft 30. The branch passage 36 supplies the lubricating oil L to a side surface of the main shaft portion 31 or the eccentric portion 32. As a result, the crankshaft 30 can smoothly rotate in a state of being supported by a sliding bearing to which the lubricating oil L is supplied in many cases at a location in contact with the compression mechanism 40, the partitioning member 70, and the support 77.(2-4) Compression mechanism 40

[0046] The compression mechanism 40 is disposed in the internal space S and above the motor 20. The compression mechanism 40 generates a high-pressure gas refrigerant by compressing a low-pressure gas refrigerant by using the power transmitted by the crankshaft 30. The compression mechanism 40 includes a fixed scroll 41 and a movable scroll 42. The fixed scroll 41 is supported by the partitioning member 70. The movable scroll 42 includes a boss 46. The eccentric portion 32 of the crankshaft 30 is fitted in a concave portion of the boss 46. The eccentric portion 32 contacts an inner surface of the concave portion of the boss 46, often via a sliding bearing. A rotation of the crankshaft 30 is transmitted to the boss 46, and accordingly, the movable scroll 42 revolves around the fixed scroll 41.

[0047] A plurality of compression chambers 43 is formed between the fixed scroll 41 and the movable scroll 42. The crankshaft 30 allows the movable scroll 42 to revolve, and thus, a volume of the compression chamber 43 changes, and the refrigerant R is compressed. The generated high-pressure gas refrigerant is discharged into the third space S3 through a discharge hole 45 provided in the fixed scroll 41.(2-5) Partitioning member 70 and support 77

[0048] The partitioning member 70 is attached to the body 11. The partitioning member 70 separates the third space S3 from the first space S1. The partitioning member 70 supports an upper portion of the main shaft portion 31 via a sliding bearing in many cases.

[0049] The partitioning member 70 is provided with a refrigerant passage 71. The refrigerant passage 71 allows the refrigerant R to pass from the third space S3 to the first space S1.

[0050] The partitioning member 70 further includes an accommodation portion 72. The accommodation portion 72 accommodates the boss 46 of the movable scroll 42. The accommodation portion 72 also functions as a temporary storage for collecting the lubricating oil L that has finished lubricating the compression mechanism 40. The lubricating oil L stored in the accommodation portion 72 moves along a path (not shown) to reach the first space S1, and then returns to the oil reservoir 14.

[0051] The support 77 is attached to the body 11. The support 77 supports a lower portion of the main shaft portion 31 of the crankshaft 30 via a sliding bearing in many cases.(3) Movement of refrigerant R and lubricating oil L

[0052] Subsequently, movement of the refrigerant R and the lubricating oil L will be described with reference to FIG. 2.

[0053] The refrigerant R compressed by the compression mechanism 40 into a high pressure state is discharged from the discharge hole 45 into the third space S3. The refrigerant R collides with the upper lid 12 of the casing 10 surrounding the third space S3 or moves along an inner surface of the upper lid 12. Thereafter, the refrigerant R passes through the refrigerant passage 71 and moves to the first space S1.

[0054] Usually, the refrigerant R has compatibility. Therefore, the refrigerant R filling the third space S3 includes a certain lubricating oil L. A part of the lubricating oil L also passes through the refrigerant passage 71 together with the refrigerant R and moves to the first space S1.

[0055] The first space S1 is also filled with a mixture of the refrigerant R and the lubricating oil L. The rotation of the rotor 25 imparts rotational motion to the mixture about the main shaft portion 31 of the crankshaft 30. As a result, especially in the mixture located between the partitioning member 70 and the motor 20, the lubricating oil L is separated from the refrigerant R by a centrifugal force and is hit against an inner wall of the body 11. This phenomenon is called cyclonic separation. The lubricating oil L on the inner wall of the body 11 finally falls into the oil reservoir 14. The refrigerant R from which the lubricating oil L has been removed passes through the discharge pipe 17 and is discharged to the outside of the compressor 100.(4) Detailed structure of motor 20

[0056] FIG. 3 is an enlarged schematic diagram of a main part of FIG. 2. The upper balance weight 37 is disposed between the height of the discharge pipe 17 and the height of the support 77 together with the motor 20.

[0057] The stator 21 of the motor 20 includes a stator core 22, an upper insulator 23a, a lower insulator 23b, and a plurality of coils 24. The stator core 22 includes a large number of laminated steel plates. The upper insulator 23a and the lower insulator 23b are both components made of resin. The upper insulator 23a is disposed on an upper surface of the stator core 22. The lower insulator 23b is disposed on a lower surface of the stator core 22. The plurality of coils 24 is formed by winding a conductive wire around the stator core 22. The plurality of coils 24 generates a magnetic field for interacting with the rotor 25 with the received power.

[0058] The rotor 25 of the motor 20 rotates about the center axis C. The rotor 25 includes a rotor body 26 and a lower balance weight 27.

[0059] The rotor body 26 includes a rotor core 26a, a permanent magnet 26b, and end plates 26c. The rotor core 26a includes a plurality of laminated steel plates. The permanent magnet 26b is installed in a space provided inside the rotor core 26a. The end plates 26c are provided on an upper surface and a lower surface of the rotor core 26a. The end plates 26c prevent the permanent magnet from being detached from the space of the rotor core 26a.

[0060] The lower balance weight 27 is disposed on a lower surface of the rotor body 26. Similarly to the upper balance weight 37, the lower balance weight 27 is for balancing the crankshaft 30. The lower balance weight 27 is in contact with the end plate 26c.

[0061] The rotary member 60 rotates together with the rotor 25. The rotary member 60 is fixed to the lower balance weight 27.

[0062] A rotor refrigerant passage 51 penetrating the rotor 25 in an axial direction of the compressor 100 is formed in the rotor 25. The rotor refrigerant passage 51 may also be referred to as "air hole". The rotor refrigerant passage 51 allows the refrigerant R to pass from the second space S2 to the first space S1.

[0063] FIG. 4 is a plan view of the stator core 22. The stator core 22 has an annular portion 22a. The annular portion 22a has an annular shape centered on the center axis C. A plurality of concave portions is formed on an outer periphery E of the annular portion 22a. These concave portions are referred to as core cuts 54. The core cuts 54 allow the refrigerant R to pass from the first space S1 to the second space S2. A plurality of teeth 22b protruding toward the center of the annular portion 22a is formed on an inner periphery of the annular portion 22a.

[0064] FIG. 5 is a schematic diagram showing an upper surface or a cross section of a main part of the compressor 100. In this drawing, the motor 20 is depicted as a plan view. On the other hand, the casing 10 and the crankshaft 30 are depicted as sectional views.

[0065] Each of the teeth 22b of the stator core 22 forms one coil 24 by winding a wire together with a portion of the insulator 23 covering each of the teeth 22b.

[0066] The plurality of core cuts 54 included in the stator core 22 forms a passage for the refrigerant R extending in the axial direction of the compressor 100 together with an inner peripheral surface of the body 11 of the casing 10.

[0067] A coil gap 53 is formed between the adjacent coils 24. The coil gap 53 also functions as a passage for the refrigerant R extending in the axial direction of the compressor 100. The coil gap 53 allows the refrigerant R to pass from the second space S2 to the first space S1.

[0068] A gap called an air gap 52 is formed between the stator 21 and the rotor 25. The air gap 52 also functions as a passage for the refrigerant R extending in the axial direction of the compressor 100. An air gap is formed between the stator and the rotor. The air gap 52 allows the refrigerant R to pass from the second space S2 to the first space S1.

[0069] The rotor refrigerant passage 51 included in the rotor 25 also functions as a passage for the refrigerant R extending in the axial direction of the compressor 100.

[0070] FIG. 6 shows a lower surface of the rotary member 60. The rotary member 60 is fixed to the lower balance weight 27. The rotary member 60 has three attachment openings 67. The attachment opening 67 allows a fastener for fixing the rotary member 60 to the lower balance weight 27 to pass therethrough. The rotary member 60 has a plurality of grooves 67. The plurality of grooves 67 radially extends from the center axis C toward a peripheral edge P in a radial pattern.

[0071] Referring to FIG. 3 again, as indicated by thick arrows, each of the rotor refrigerant passage 51, the air gap 52, and the coil gap 53 allows the refrigerant R to pass from below to upward when the compressor 100 compresses the refrigerant R. Each of the rotor refrigerant passage 51, the air gap 52, and the coil gap 53 allows the refrigerant R to pass from below to above the motor 20, and are thus collectively referred to as a refrigerant ascending passage 50. On the other hand, the core cut 54 allows the refrigerant R to pass from above to downward as indicated by thick arrows, and thus can be also referred to as a refrigerant descending passage.(5) Structure around rotary member 60

[0072] FIG. 7 is an enlarged schematic diagram of a main part of FIG. 3. The lower insulator 23b has a base P1, an outer peripheral wall P2, and an inner peripheral wall P3. The base P1 is an annular portion in contact with the stator core 22. The outer peripheral wall P2 extends downward from near an outer periphery of the base P1. The inner peripheral wall P3 extends downward from near an inner periphery of the base P1.

[0073] The rotary member 60 is fixed to the lower balance weight 27 as described above. The rotary member 60 is indirectly fixed to the rotor body 26 via the lower balance weight 27. The lower balance weight 27 is fixed to the end plate 26c of the rotor body 26. The rotary member 60 rotates together with the crankshaft 30, the rotor body 26, and the lower balance weight 27.

[0074] The rotary member 60 is disposed lower than a lower end B of the coil 24. The height difference between the rotary member 60 and the lower end of the coil 24 is, for example, 20 mm or less, preferably 15 mm or less. An outer diameter X of the rotary member 60 is larger than an inner diameter Y of the stator 21. As a result, the rotary member 60 covers a refrigerant inlet below the refrigerant ascending passage 50. In FIG. 7, only a half of the outer diameter X and the inner diameter Y is illustrated, and is indicated as (X / 2) and (Y / 2), respectively. The rotary member 60 is disposed higher than a lower end T of the outer peripheral wall P2 of the lower insulator 23b.

[0075] The refrigerant R ascending from below changes its traveling direction after colliding with the rotary member 60. At this time, the lubricating oil L contained in the refrigerant R in the state of fine particles of oil mist is absorbed by an oil film already existing on the lower surface of the rotary member 60.

[0076] FIG. 8 is a sectional view of the rotary member 60. The groove 67 provided on the lower surface of the rotary member 60 has an inner wall 68. Below the rotary member 60, the refrigerant R flows in a circumferential direction of the rotary member 60 and moves outward in a radial direction of the rotary member 60 as a whole. A part of the refrigerant R flows into the groove 67 and forms a vortex, and the oil mist in the refrigerant R collides with the inner wall 68 located on a side opposite to the traveling direction of the refrigerant R and other portions. The lubricating oil L contained in the refrigerant R is also absorbed by the oil film on the inner wall 68 of the groove 67.

[0077] The lubricating oil L constituting the oil film on the lower surface of the rotary member 60 moves on the surface of the rotary member 60 so as to spiral radially outward from the center of the rotary member 60 by the action of viscosity and centrifugal force of the lubricating oil L. The lubricating oil L constituting the oil film of the inner wall 68 moves radially outward along the groove 67. Thereafter, the lubricating oil L protrudes radially from the outer periphery of the rotary member 60. Then, the lubricating oil L collides with the casing 10 and other constituent components and falls into the oil reservoir 14.(6) Characteristics

[0078] (6-1) The rotary member 60 is positioned between the discharge pipe 17 and the oil reservoir 14. Therefore, since the refrigerant R ascending from the oil reservoir 14 to the discharge pipe 17 collides with the rotary member 60 functioning as an obstacle to the refrigerant R, the lubricating oil L contained in the refrigerant R is separated, and eventually, discharge of the lubricating oil L from the compressor 100 is suppressed. (6-2) The rotary member 60 is disposed below the coil 24. Therefore, since the refrigerant R ascending from the oil reservoir 14 to the coil gap 53 collides with the rotary member 60, the lubricating oil L contained in the refrigerant R is separated. Since the proportion of the sectional area of the coil gap 53 in the area through which the ascending refrigerant flow passes is large, the separation of the lubricating oil L becomes efficient. (6-3) The rotary member 60 is disposed close to the lower end of the coil 24, and as a result, the height difference between the rotary member 60 and the lower end of the coil 24 is 20 mm or less, or preferably 15 mm or less. Therefore, the rotary member 60 can function as an obstacle to the refrigerant R. (6-4) The descending flow of the refrigerant R passing through the core cut 54 moves further downward than the outer peripheral wall P2 disposed lower than the rotary member 60 and then changes to an ascending flow. Therefore, the ascending flow of the refrigerant R easily collides with the rotary member 60. (6-5) When the refrigerant R moves near the rotary member 60, a part of the refrigerant R flows in the groove 69 and collides with the inner wall 68 of the groove 69. Due to this collision, the lubricating oil L contained in the refrigerant R may be absorbed by the oil film already attached to the inner wall 68 of the groove 69. Therefore, the lubricating oil L contained in the refrigerant R is efficiently separated from the refrigerant R. (6-6) The ascending flow of the refrigerant R passes through the rotor refrigerant passage 51, the air gap 52, and the coil gap 53. The rotary member 60 interrupts the entire rotor refrigerant passage 51, the entire air gap 52, and at least a part of the coil gap 53 in plan view. Therefore, a large proportion of the ascending flow of the refrigerant R collides with the rotary member 60. (6-7) The rotary member 60 is indirectly fixed to the rotor body 26. Accordingly, the rotary member 60 can interrupt a central portion of the refrigerant ascending flow. (6-8) The rotor 25 has the lower balance weight 27. Therefore, vibration during rotation of the rotor 25 can be suppressed. (6-9) The rotary member 60 is fixed to the lower balance weight 27. Accordingly, the rotary member 60 is fixed to the rotor body 26 via the lower balance weight 27. (6-10) The compressor 100 includes the rotary member 60 which functions as an obstacle to the refrigerant R. Therefore, in the refrigerant circuit of the refrigeration apparatus 101, discharge of the lubricating oil L from the compressor 100 is suppressed. (7) Modifications

[0079] (7-1) In the compressor 100 according to the first embodiment described above, the rotary member 60 is indirectly fixed to the rotor body 26 via the lower balance weight 27. Alternatively, the rotary member 60 may be fixed to the crankshaft 30.

[0080] In this configuration, the rotary member 60 is fixed to the crankshaft 30. Therefore, the rotary member 60 can interrupt the refrigerant ascending flow near the crankshaft 30. (7-2) The compressor 100 according to the first embodiment described above is a scroll compressor. Alternatively, the compressor 100 may be a compressor other than a scroll compressor. For example, the compressor 100 may be a rotary compressor or a screw compressor. (7-3) In the compressor 100 according to the first embodiment described above, the rotary member 60 is provided with the plurality of grooves 67. Alternatively, the rotary member 60 may be provided with only one groove 67 radially extending from the center axis C toward the peripheral edge P. Alternatively, the rotary member 60 is not required to be provided with the groove 67. (7-4) In the compressor 100 according to the first embodiment described above, the lower balance weight 27 has an arc shape as shown in FIG. 6. Alternatively, the lower balance weight 27 may have a semicircular shape as shown in FIG. 9. FIG. 9 shows a lower surface of the rotor 25. The lower balance weight 27 includes a semicircular weight portion 27a, two legs 27b extending radially, and a cyclic portion 27c connecting the weight portion 27a and the legs 27b.

[0081] In this configuration, a region of the rotary member 80 not supported by the weight portion 27a is supported by the legs 27b. Therefore, since the risk of deformation of the rotary member 80 is reduced by the legs 27b, the rotary member 80 can stably separate the lubricating oil L contained in the refrigerant R.<Second embodiment>(1) Configuration

[0082] FIG. 10 is an enlarged schematic diagram of the compressor 100 according to a second embodiment. The compressor 100 according to the present embodiment is different from the compressor according to the first embodiment in the structure of the rotary member 60. The rotary member 60 according to the present embodiment is different from the rotary member 60 according to the first embodiment in that the rotary member has a first opening 61 and a second opening 62.

[0083] FIG. 11 is a plan view of the rotary member 60 according to the present embodiment. FIG. 11 also shows a position of the lower balance weight 27 fixed to the rotary member 60. The shape of the rotation balance weight 27 is the same as in the modification of the first embodiment shown in FIG. 7. In addition to the plurality of grooves 67, the rotary member 60 has four first openings 61, eight second openings 62, and five attachment openings 67. The attachment opening 67 allows a fastener for fixing the rotary member 60 to the lower balance weight 27 to pass therethrough. An outer region Q of the rotary member 60 is sandwiched between the peripheral edge P and the second opening 62.

[0084] Referring to FIG. 10 again, the first opening 61 is configured to communicate with the rotor refrigerant passage 51. The second opening 62 is configured to communicate with the air gap 52. The outer region Q has a function of at least partially interrupting the ascending flow of the refrigerant passing through the coil gap 53.(2) Characteristics

[0085] The rotary member 60 has the first opening 61 or the second opening 62. Therefore, since a part of the ascending flow of the refrigerant R can pass through any of the rotor refrigerant passage 51, the air gap 52, or the coil gap 53 after passing through the first opening 61 or the second opening 62, a required amount of the ascending flow of the refrigerant R can be secured.(3) Modifications

[0086] (3-1) The numbers of the first openings 61, the second openings 62, and the attachment openings 67 are not necessarily limited to the configuration shown in FIG. 11. The rotary member 60 may have only one of the first opening 61 or the second opening 62. (3-2) In the compressor 100 according to the second embodiment described above, the rotary member 60 is indirectly fixed to the rotor body 26 via the lower balance weight 27. Alternatively, the rotary member 60 may be directly fixed to the rotor body 26. When the rotary member 60 passes through the first opening 61 or the second opening 62, the refrigerant ascending flow can reach the rotor refrigerant passage 51 or the air gap 52. (3-3) A part of the configuration disclosed as the first embodiment or the modification of the first embodiment may be applied to the present embodiment. <Conclusion>

[0087] The embodiments of the present disclosure have been described above. It is understood that various changes to modes and details should be available without departing from the gist and scope of the present disclosure recited in the claims.REFERENCE SIGNS LIST

[0088] 10: casing 14: oil reservoir 15: suction pipe 17: discharge pipe 20: motor 21: stator 22: stator core 23a: upper insulator 23b: lower insulator 24: coil 25: rotor 26: rotor body 26a: rotor core 26b: permanent magnet 26c: end plate 27: lower balance weight 30: crankshaft 37: upper balance weight 40: compression mechanism 50: refrigerant ascending passage 51: rotor refrigerant passage 52: air gap 53: coil gap 54: core cut (refrigerant descending passage) 60: rotary member 61: first opening 62: second opening 69: groove 80: utilization unit 90: heat source unit 100: compressor 101: refrigeration apparatus B: coil lower end (lower end) E: outer periphery of stator core (outer periphery) L: lubricating oil P1: base P2: outer peripheral wall P3: inner peripheral wall R: refrigerant S: internal space S1: first space S2: second space S3: third space T: lower end of outer peripheral wall (lower end) X: outer diameter of rotary member (outer diameter) Y: inner diameter of stator (inner diameter) CITATION LIST PATENT LITERATURE

[0089] Patent Literature 1: JP 2021-017849 A

Claims

1. A compressor (100) comprising: a casing (10) having an internal space (S); a motor (20) that includes a stator (21) having a cylindrical shape, a rotor (25) disposed in the stator, a refrigerant descending passage (54), and a refrigerant ascending passage (50), and is disposed in the internal space; a compression mechanism (40) that is disposed in the internal space and above the motor, a first space (S1) being formed between the compression mechanism and the motor, the compression mechanism compressing a refrigerant (R); an oil reservoir (14) that is disposed in the internal space and below the motor, a second space (S2) being formed between the oil reservoir and the motor; a crankshaft (30) that transmits rotation of the rotor to the compression mechanism; a rotary member (60) that is disposed in the second space, rotates together with the rotor, and has an outer diameter (X) larger than an inner diameter (Y) of the stator; and a discharge pipe (17) disposed in the first space, wherein the refrigerant descending passage allows the refrigerant to pass from the first space to the second space, and the refrigerant ascending passage allows the refrigerant to pass from the second space to the first space.

2. The compressor according to claim 1, wherein the stator includes a stator core (22) and a coil (24) that is formed by winding a conductive wire around the stator core, the refrigerant descending passage is a core cut (54) formed on an outer periphery (E) of the stator core, and the rotary member is disposed lower than a lower end (B) of the coil.

3. The compressor according to claim 2, wherein a height difference between the rotary member and the lower end (B) of the coil is 20 mm or less.

4. The compressor according to claim 2 or 3, wherein the stator further includes a lower insulator (23b) having an annular shape and disposed on a lower surface of the stator core, the lower insulator has an outer peripheral wall (P2) extending downward from near an outer periphery of the lower insulator, and the rotary member is disposed higher than a lower end (T) of the outer peripheral wall.

5. The compressor according to any one of claims 1 to 4, wherein the rotary member has a groove (67) radially extending from a center toward a peripheral edge.

6. The compressor according to any one of claims 1 to 4, wherein the rotary member has a plurality of grooves (67) radially extending from a center toward a peripheral edge in a radial pattern.

7. The compressor according to any one of claims 1 to 6, wherein the rotor includes a rotor refrigerant passage (51) penetrating the rotor in an axial direction, an air gap (52) is formed between the stator and the rotor, the stator has a coil gap (53) located between two of the coils adjacent, and the refrigerant ascending passage (50) includes the rotor refrigerant passage (51), the air gap (52), and the coil gap (53).

8. The compressor according to any one of claims 1 to 7, wherein the rotor includes a rotor body and a lower balance weight (27) provided on a lower surface of the rotor body, and the rotary member is fixed to the lower balance weight.

9. The compressor according to any one of claims 1 to 7, wherein the rotor includes a rotor body and a lower balance weight (27) provided on a lower surface of the rotor body, and the rotary member is fixed to the rotor body.

10. The compressor according to any one of claims 1 to 7, wherein the rotary member is fixed to the crankshaft.

11. The compressor according to any one of claims 1 to 10, wherein the rotary member has at least one of a first opening (61) communicating with the rotor refrigerant passage or a second opening (62) communicating with the air gap.

12. A refrigeration apparatus (101) comprising the compressor according to any one of claims 1 to 11.

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