Compressor and refrigeration device

Abstract

A compressor (100) is provided with a casing (10), a motor (20), a compression mechanism (40), an oil reservoir (14), a crankshaft (30), a rotating member (60), a first space (S1), a second space (S2), and a discharge pipe (17). The motor (20) has a stator (21), a rotor (25), a refrigerant lowering passage (54), and a refrigerant rising passage (50). The rotating member (60) rotates together with the rotor (25) and has an outer diameter (X) that is greater than an inner diameter (Y) of the stator (21). The crankshaft (30) transmits the 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 lowering passage (54) allows the refrigerant (R) to pass from the first space (S1) to the second space (S2). The refrigerant rising passage (50) allows the refrigerant (R) to pass from the second space (S2) to the first space (S1).

Description

Compressors and refrigeration equipment

[0001] The present disclosure relates to a compressor and a refrigeration device.

[0002] In order to reduce the amount of lubricating oil discharged outside the compressor, the compressor disclosed in Patent Document 1 (JP 2021-017849 A) ​​adjusts the dimensions of the balance weight attached to the underside of the motor rotor and the relative position of the balance weight with respect to other parts.

[0003] The refrigerant located below the motor contains lubricating oil. If this refrigerant reaches the compressor's discharge pipe, the lubricating oil will be discharged outside the compressor. To reduce this discharge, it is desirable to optimize the structure of not only the balance weight but also the components located near the bottom of the motor, thereby making it easier for the lubricating oil contained in the refrigerant to separate from the refrigerant.

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

[0005] With this configuration, the rotating member is located between the discharge pipe and the oil reservoir, so that the refrigerant ascending from the oil reservoir to the discharge pipe through the refrigerant ascending passage collides with the rotating member, which acts as an obstacle to the refrigerant, separating the lubricating oil contained in the refrigerant and thereby suppressing discharge of the lubricating oil from the compressor.

[0006] A compressor according to a second aspect is the compressor according to the first aspect, wherein 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 the outer periphery of the stator core. The rotating member is positioned lower than a lower end of the coil.

[0007] With this configuration, the refrigerant undergoes cyclone separation in the first space, where a predetermined amount of lubricating oil is separated, and then descends through the outer core cut into the second space. The refrigerant then attempts to rise from the second space adjacent to the oil reservoir toward the motor coil gap, colliding with a rotating member located below the motor coil before reaching the motor coil gap, further promoting the separation of the lubricating oil from the refrigerant. Because the cross-sectional area of ​​the coil gap accounts for a large proportion of the area through which the ascending refrigerant flow passes, the separation of the lubricating oil is efficient.

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

[0009] According to this configuration, the rotating member is disposed close to the lower end of the coil, and therefore 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, wherein the stator further includes an annular lower insulator. The lower insulator is disposed on the lower surface of the stator core. The lower insulator has an outer circumferential wall extending downward from near the outer periphery of the lower insulator. The rotating member is disposed higher than a lower end of the outer circumferential wall.

[0011] With this configuration, the downward flow of the refrigerant passing through the core cut moves further below the outer wall, which is positioned lower than the rotating member, and then changes into an upward flow, which makes it more likely for the upward flow of the refrigerant to collide with the rotating member.

[0012] A compressor according to a fifth aspect is the compressor according to any one of the first aspect to the fourth aspect, wherein the rotating member has grooves extending radially from the center to the periphery.

[0013] With this configuration, as the refrigerant moves near the rotating member, some of the refrigerant flows through the groove and collides with the wall of the groove. This collision causes the lubricating oil contained in the refrigerant to be absorbed into the oil film already adhering to the 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 aspect to the fourth aspect, wherein the rotary member has a plurality of grooves extending radially in the radial direction from the center to the periphery.

[0015] According to this configuration, the rotating member is provided with a plurality of grooves that function to separate the lubricating oil from the refrigerant, so that the lubricating oil contained in the refrigerant is separated from the refrigerant more efficiently.

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

[0017] With this configuration, the upward flow of the refrigerant passes through the rotor refrigerant passage, the air gap, and the coil gap. In plan view, the rotating member blocks the entire rotor refrigerant passage, the entire air gap, and at least a portion of the coil gap. Therefore, a large proportion of the upward flow of the refrigerant collides with the rotating member.

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

[0019] According to this configuration, the rotor has a lower balance weight, which makes it possible to suppress vibrations during rotation of the rotor.

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

[0021] According to this configuration, the rotating member is fixed to the rotor body, and therefore the rotating member can block the center of the upward flow of the refrigerant.

[0022] A compressor according to a tenth aspect is the compressor according to any one of the first aspect to the seventh aspect, wherein the rotating member is fixed to a crankshaft.

[0023] According to this configuration, the rotating member is fixed to the crankshaft, and therefore the rotating member can block the upward flow of refrigerant near the crankshaft.

[0024] A compressor of an eleventh aspect is the compressor of any one of the first aspect to the tenth aspect, wherein the rotating member has at least one of a first opening communicating with the rotor refrigerant passage and a second opening communicating with the air gap.

[0025] According to this configuration, the rotating member has the first opening or the second opening, so that a portion of the upward flow of the refrigerant can pass through the first opening or the second opening and then pass through the rotor refrigerant passage, the air gap, or the coil gap, thereby ensuring the required amount of upward flow of the refrigerant.

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

[0027] According to this configuration, the compressor has a rotating member that functions as an obstacle to the refrigerant, and therefore, the lubricating oil is prevented from being discharged from the compressor in the refrigerant circuit of the refrigeration device.

[0028] FIG. 1 is a circuit diagram showing the configuration of a refrigeration apparatus 101 according to a first embodiment. FIG. 2 is a cross-sectional view showing the configuration of a compressor 100 according to the first embodiment. FIG. 3 is an enlarged schematic view of a main portion of FIG. 2. FIG. 4 is a plan view of a stator core 22. FIG. 5 is a schematic view showing the top surface or cross section of a main portion of the compressor 100. FIG. 6 is a schematic view showing the bottom surface of a rotating member 60. FIG. 7 is an enlarged schematic view of a main portion of FIG. 3. FIG. 8 is a cross-sectional view of the rotating member 60. FIG. 9 is a schematic view showing the bottom surface or cross section of a main portion of the compressor 100. FIG. 10 is an enlarged schematic view of a main portion of a compressor 100 according to a second embodiment. FIG. 11 is a schematic view showing the bottom surface of a rotating member 60 according to the second embodiment.

[0029] 1 shows the configuration of a refrigeration device 101 according to the first embodiment. The refrigeration device 101 has a heat source unit 90, utilization units 80, and a communication pipe group 85.

[0030] The heat source unit 90 functions as a heat source or a cold source for the 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 shut-off valve 97, and a gas shut-off valve 98.

[0031] The utilization unit 80 provides the user with the 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 communication pipe group 85 connects the heat source unit 90 and the utilization unit 80. The communication pipe group 85 has a liquid pipe 86 and a gas pipe 87. The liquid pipe 86 connects the liquid shut-off valve 97 and the utilization heat exchanger 81. The gas pipe 87 connects the gas shut-off valve 98 and the utilization heat exchanger 81.

[0033] The components of the heat source unit 90, the components of the utilization units 80, and the communication 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 generates high-pressure gas refrigerant (i.e., refrigerant R having a high pressure and in a gaseous state) by compressing low-pressure gas refrigerant (i.e., refrigerant R having a low pressure and in a gaseous state).

[0035] When the four-way selector valve 92 is connected as shown by the solid lines, the refrigeration system 101 operates in cold heat utilization mode. At this time, the utilization heat exchanger 81 functions as an evaporator or heat absorber, and provides the cold obtained from the refrigerant R to the user. When the four-way selector valve 92 is connected as shown by the dashed lines, the refrigeration system 101 operates in hot heat utilization mode. At this time, the utilization heat exchanger 81 functions as a condenser or heat radiator, and provides the hot heat obtained from the refrigerant R to the user.

[0036] (2) Configuration of Compressor 100 Fig. 2 shows the 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 partition member 70, and a support member 77.

[0037] (2-1) Casing 10 The casing 10 has a body 11, an upper cover 12, and a lower cover 13 that are airtightly joined together.

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

[0039] An oil reservoir 14 for storing lubricating oil L is provided near the lower cover portion 13. The oil reservoir 14 is disposed within 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 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 drawing in low-pressure gas refrigerant is attached to the upper lid portion 12. A discharge pipe 17 for discharging high-pressure gas refrigerant is attached to the body portion 11. The discharge pipe 17 is disposed in the first space S1.

[0042] (2-2) Motor 20 The motor 20 is disposed within the internal space S. The motor 20 generates power for driving the compression mechanism 40 by utilizing electric power supplied from outside the compressor 100. The motor 20 has a stator 21 and a rotor 25. The stator 21 and the rotor 25 are columnar or cylindrical and share a common central axis C. The stator 21 is fixed to the body 11. The rotor 25 is disposed in a cavity in the center of the stator 21 and is rotatably supported.

[0043] (2-3) Crankshaft 30 The crankshaft 30 transmits the power generated by the motor 20 to the compression mechanism 40. The crankshaft 30 has a main shaft portion 31, an eccentric portion 32 that is eccentric with respect to the main shaft portion 31, and an upper balance weight 37. The main shaft portion 31 shares a central axis C with the stator 21 and the rotor 25.

[0044] A portion of the main shaft 31 passes through a cavity in the center of the rotor 25 and is fixed to the rotor 25. This allows the crankshaft 30 to rotate together with the rotor 25. The upper balance weight 37 is used to balance the crankshaft 30. Unlike the configuration of this embodiment, the upper balance weight 37 may be configured as a member separate from the crankshaft 30 and fixed to the upper surface of the rotor 25.

[0045] A main passage 35 is provided inside the crankshaft 30 to draw up the lubricating oil L from the oil reservoir 14. The lubricating oil L drawn up to the upper end of the main passage 35 is used to lubricate the compression mechanism 40. The main passage 35 also communicates with a plurality of branch passages 36 extending radially of the crankshaft 30. The branch passages 36 supply the lubricating oil L to the side surfaces of the main shaft portion 31 or the eccentric portion 32. This allows the crankshaft 30 to rotate smoothly at points of contact with the compression mechanism 40, the partition member 70, and the support member 77, often supported by plain bearings supplied with the lubricating oil L.

[0046] (2-4) Compression Mechanism 40 The compression mechanism 40 is disposed within the internal space S and above the motor 20. The compression mechanism 40 generates high-pressure gas refrigerant by compressing low-pressure gas refrigerant using power transmitted by the rotation of the crankshaft 30. The compression mechanism 40 has a fixed scroll 41 and a movable scroll 42. The fixed scroll 41 is supported by the partition member 70. The movable scroll 42 has a boss 46. The eccentric portion 32 of the crankshaft 30 is fitted into a recess of the boss 46. The eccentric portion 32 contacts the inner surface of the recess of the boss 46, often via a plain bearing. The rotation of the crankshaft 30 is transmitted to the boss 46, causing the movable scroll 42 to revolve relative to the fixed scroll 41.

[0047] A plurality of compression chambers 43 are formed between the fixed scroll 41 and the movable scroll 42. When the crankshaft 30 revolves the movable scroll 42, the volume of the compression chambers 43 varies, thereby compressing the refrigerant R. The generated high-pressure gas refrigerant is discharged from a discharge hole 45 provided in the fixed scroll 41 into the third space S3.

[0048] (2-5) Partition member 70, support member 77 The partition member 70 is attached to the body portion 11. The partition member 70 separates the third space S3 from the first space S1. The partition member 70 supports the upper part of the main shaft portion 31, often via a slide bearing.

[0049] The partition 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 partition member 70 further has a storage section 72. The storage section 72 stores the boss 46 of the movable scroll 42. The storage section 72 also functions as a temporary storage section for collecting the lubricating oil L that has finished lubricating the compression mechanism 40. The lubricating oil L stored in the storage section 72 travels through a path not shown to reach the first space S1 and then returns to the oil reservoir 14.

[0051] The support member 77 is attached to the body portion 11. The support member 77 supports the lower portion of the main shaft portion 31 of the crankshaft 30, often via a slide bearing.

[0052] (3) Movement of Refrigerant R and Lubricating Oil L With continued reference to FIG. 2, the movement of refrigerant R and lubricating oil L will be described.

[0053] The refrigerant R compressed in the compression mechanism 40 and brought to a high-pressure state is discharged into the third space S3 from the discharge hole 45. The refrigerant R collides with the top cover 12 of the casing 10, which surrounds the third space S3, or moves along the inner surface of the top cover 12. The refrigerant R then passes through the refrigerant passage 71 and moves into the first space S1.

[0054] Generally, the refrigerant R is compatible with the refrigerant R. Therefore, the refrigerant R filling the third space S3 contains a certain amount of lubricating oil L. A portion 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 refrigerant R and lubricating oil L. The rotation of the rotor 25 imparts rotational motion to this mixture around the main shaft portion 31 of the crankshaft 30. As a result, the lubricating oil L, particularly in the mixture located between the partition member 70 and the motor 20, is separated from the refrigerant R by centrifugal force and slammed against the inner wall of the body portion 11. This phenomenon is called cyclone separation. The lubricating oil L on the inner wall of the body portion 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.

[0056] (4) Detailed Structure of Motor 20 Figure 3 is an enlarged schematic view of the main part of Figure 2. The upper balance weight 37, together with the motor 20, is disposed between the height of the discharge pipe 17 and the height of the support member 77.

[0057] The stator 21 of the motor 20 has a stator core 22, an upper insulator 23a, a lower insulator 23b, and multiple coils 24. The stator core 22 is formed from multiple laminated steel plates. The upper insulator 23a and the lower insulator 23b are both made of resin. The upper insulator 23a is disposed on the upper surface of the stator core 22. The lower insulator 23b is disposed on the lower surface of the stator core 22. The multiple coils 24 are formed by winding conductive wires around the stator core 22. The multiple coils 24 use the received power to generate a magnetic field that interacts with the rotor 25.

[0058] The rotor 25 of the motor 20 rotates around a central axis C. The rotor 25 has a rotor body 26 and a lower balance weight 27.

[0059] The rotor body 26 has a rotor core 26a, permanent magnets 26b, and end plates 26c. The rotor core 26a is made of multiple laminated steel plates. The permanent magnets 26b are installed in a space provided inside the rotor core 26a. The end plates 26c are provided on the upper and lower surfaces of the rotor core 26a. The end plates 26c prevent the permanent magnets from falling out of the space inside the rotor core 26a.

[0060] The lower balance weight 27 is installed on the underside of the rotor body 26. Like the upper balance weight 37, the lower balance weight 27 is used to balance the crankshaft 30. The lower balance weight 27 is in contact with the end plate 26c.

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

[0062] The rotor 25 is formed with a rotor refrigerant passage 51 that penetrates the rotor 25 in the axial direction of the compressor 100. The rotor refrigerant passage 51 is also called an "air hole." The rotor refrigerant passage 51 allows the refrigerant R to pass from the second space S2 to the first space S1.

[0063] 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 a central axis C. A plurality of recesses are formed on the outer periphery E of the annular portion 22a. These recesses are called 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 are formed on the inner periphery of the annular portion 22a, protruding toward the center of the annular portion 22a.

[0064] 5 is a schematic diagram showing a top view or a cross section of a main part of the compressor 100. In this figure, the motor 20 is drawn as a plan view, while the casing 10 and the crankshaft 30 are drawn as cross sections.

[0065] Each tooth 22 b of the stator core 22 is wound with a winding together with a portion of the insulator 23 that covers the tooth 22 b , thereby forming one coil 24 .

[0066] The multiple core cuts 54 of the stator core 22 , together with the inner circumferential surface of the body portion 11 of the casing 10 , form a passage for the refrigerant R extending in the axial direction of the compressor 100 .

[0067] Coil gaps 53 are formed between adjacent coils 24. The coil gaps 53 also function as passages for the refrigerant R extending in the axial direction of the compressor 100. The coil gaps 53 allow 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 25 has a rotor refrigerant passage 51 which also functions as a passage for the refrigerant R extending in the axial direction of the compressor 100 .

[0070] 6 shows the underside of the rotating member 60. The rotating member 60 is fixed to the lower balance weight 27. The rotating member 60 has three mounting openings 67. The mounting openings 67 are for fasteners to pass through to fix the rotating member 60 to the lower balance weight 27. The rotating member 60 has a plurality of grooves 67. The plurality of grooves 67 extend radially from the central axis C toward the circumferential edge P.

[0071] 3 , as indicated by the thick arrows, the rotor refrigerant passage 51, the air gap 52, and the coil gap 53 all allow the refrigerant R to pass from below to above when the compressor 100 compresses the refrigerant R. Because the rotor refrigerant passage 51, the air gap 52, and the coil gap 53 all allow the refrigerant R to pass from below to above the motor 20, they are collectively referred to as the refrigerant ascending passage 50. On the other hand, the core cut 54 allows the refrigerant R to pass from above to below as indicated by the thick arrow, and therefore can also be referred to as the refrigerant descending passage.

[0072] (5) Structure around the rotating member 60 Figure 7 is an enlarged schematic diagram of a main portion of Figure 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 that contacts the stator core 22. The outer peripheral wall P2 extends downward from near the outer periphery of the base P1. The inner peripheral wall P3 extends downward from near the inner periphery of the base P1.

[0073] As described above, the rotating member 60 is fixed to the lower balance weight 27. The rotating 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 rotating member 60 rotates together with the crankshaft 30, the rotor body 26, and the lower balance weight 27.

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

[0075] The refrigerant R rising from below changes direction after colliding with the rotating member 60. At this time, the lubricating oil L contained in the refrigerant R in the form of tiny particles of oil mist is absorbed into the oil film already present on the underside of the rotating member 60.

[0076] 8 is a cross-sectional view of the rotating member 60. A groove 67 provided on the lower surface of the rotating member 60 has an inner wall 68. Below the rotating member 60, the refrigerant R flows in the circumferential direction of the rotating member 60 while moving radially outward of the rotating member 60 as a whole. Some of the refrigerant R flows around the groove 67 and creates a vortex, and oil mist in the refrigerant R collides with the inner wall 68 and other locations located on the opposite end from the direction of travel of the refrigerant R. The lubricating oil L contained in the refrigerant R is also absorbed into an oil film on the inner wall 68 of the groove 67.

[0077] The lubricating oil L that forms the oil film on the underside of the rotating member 60 moves in a spiral from the center of the rotating member 60 toward the radially outward direction on the surface of the rotating member 60 due to its own viscosity and the action of centrifugal force. The lubricating oil L that forms the oil film on the inner wall 68 moves radially outward along the grooves 67. The lubricating oil L then splashes out radially from the outer periphery of the rotating member 60. The lubricating oil L then collides with the casing 10 and other components and falls into the oil reservoir 14.

[0078] (6) Features (6-1) Rotating member 60 is located between discharge pipe 17 and oil reservoir 14. Therefore, refrigerant R rising from oil reservoir 14 to discharge pipe 17 collides with rotating member 60, which functions as an obstacle to refrigerant R, so that lubricating oil L contained in refrigerant R is separated, and thus discharge of lubricating oil L from compressor 100 is suppressed.

[0079] (6-2) Rotating member 60 is disposed below coil 24. Therefore, refrigerant R attempting to rise from oil reservoir 14 to coil gap 53 collides with rotating member 60, causing lubricating oil L contained in refrigerant R to be separated. Because the cross-sectional area of ​​coil gap 53 accounts for a large proportion of the area through which the rising refrigerant flow passes, separation of lubricating oil L is efficient.

[0080] (6-3) The rotating member 60 is disposed close to the lower end of the coil 24, so that the difference in height between the rotating member 60 and the lower end of the coil 24 is 20 mm or less, or preferably 15 mm or less. Therefore, the rotating member 60 can function as an obstacle to the refrigerant R.

[0081] (6-4) The downward flow of refrigerant R passing through core cut 54 changes to an upward flow after moving further downward from outer peripheral wall P2, which is positioned lower than rotating member 60. Therefore, the upward flow of refrigerant R is likely to collide with rotating member 60.

[0082] (6-5) When refrigerant R moves near rotating member 60, part of the refrigerant R flows through groove 69 and collides with inner wall 68 of groove 69. This collision may cause lubricating oil L contained in refrigerant R to be absorbed into the oil film already adhering to inner wall 68 of groove 69. Therefore, lubricating oil L contained in refrigerant R is efficiently separated from refrigerant R.

[0083] (6-6) The upward flow of refrigerant R passes through rotor refrigerant passage 51, air gap 52, and coil gap 53. In plan view, rotating member 60 blocks the entire rotor refrigerant passage 51, the entire air gap 52, and at least a portion of the coil gap 53. Therefore, a large proportion of the upward flow of refrigerant R collides with rotating member 60.

[0084] (6-7) The rotating member 60 is indirectly fixed to the rotor body 26. Therefore, the rotating member 60 can block the center of the upward flow of the refrigerant.

[0085] (6-8) The rotor 25 has a lower balance weight 27. Therefore, vibrations of the rotor 25 during rotation can be suppressed.

[0086] (6-9) The rotating member 60 is fixed to the lower balance weight 27. Therefore, the rotating member 60 is fixed to the rotor body 26 via the lower balance weight 27.

[0087] (6-10) The compressor 100 has the rotating member 60 that functions as an obstacle to the refrigerant R. Therefore, in the refrigerant circuit of the refrigeration device 101, the discharge of the lubricating oil L from the compressor 100 is suppressed.

[0088] (7) Modifications (7-1) In the compressor 100 according to the first embodiment described above, the rotating member 60 is indirectly fixed to the rotor body 26 via the lower balance weight 27. Alternatively, the rotating member 60 may be fixed to the crankshaft 30.

[0089] According to this configuration, the rotating member 60 is fixed to the crankshaft 30. Therefore, the rotating member 60 can block the upward flow of refrigerant near the crankshaft 30.

[0090] (7-2) The compressor 100 according to the first embodiment 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.

[0091] (7-3) In the compressor 100 according to the first embodiment described above, the rotating member 60 is provided with a plurality of grooves 67. Alternatively, the rotating member 60 may be provided with only one groove 67 extending radially from the central axis C toward the periphery P. Alternatively, the rotating member 60 may not be provided with a groove 67.

[0092] (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 the underside of the rotor 25. The lower balance weight 27 has a semicircular weight portion 27a, two legs 27b extending in the radial direction, and an annular portion 27c connecting the weight portion 27 and the legs 27b.

[0093] According to this configuration, the region of the rotating member 80 that is not supported by the weight portion 27 is supported by the legs 27b. Therefore, the risk of deformation of the rotating member 80 is reduced by the legs 27b, and the rotating member 80 can stably separate the lubricating oil L contained in the refrigerant R.

[0094] Second Embodiment (1) Configuration Fig. 10 is an enlarged schematic view of a compressor 100 according to a second embodiment. The compressor 100 according to this embodiment differs from the first embodiment in the structure of the rotating member 60. The rotating member 60 according to this embodiment differs from the rotating member 60 of the first embodiment in that it has a first opening 61 and a second opening 62.

[0095] FIG. 11 is a plan view of the rotating member 60 according to this embodiment. The position of the lower balance weight 27 fixed to the rotating member 60 is also shown in this figure. The shape of the rotating balance weight 27 is the same as that of the modified example of the first embodiment shown in FIG. 7. In addition to multiple grooves 67, the rotating member 60 has four first openings 61, eight second openings 62, and five mounting openings 67. The mounting openings 67 are for passing fasteners to fix the rotating member 60 to the lower balance weight 27. The outer region Q of the rotating member 60 is sandwiched between the periphery P and the second openings 62.

[0096] 10 , 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 the function of at least partially blocking the upward flow of refrigerant attempting to pass through the coil gap 53.

[0097] (2) Features Rotating member 60 has first opening 61 or second opening 62. Therefore, a portion of the upward flow of refrigerant R can pass through either first opening 61 or second opening 62 and then through rotor refrigerant passage 51, air gap 52, or coil gap 53, thereby ensuring the required amount of upward flow of refrigerant R.

[0098] (3) Modifications (3-1) The numbers of the first openings 61, the second openings 62, and the attachment openings 67 do not need to be limited to the configuration shown in Fig. 11. The rotating member 60 may have only one of the first openings 61 and the second openings 62.

[0099] (3-2) In the compressor 100 according to the second embodiment described above, the rotating member 60 is indirectly fixed to the rotor body 26 via the lower balance weight 27. Alternatively, the rotating member 60 may be directly fixed to the rotor body 26. The upward refrigerant flow can reach the rotor refrigerant passage 51 or the air gap 52 by the rotating member 60 passing through the first opening 61 or the second opening 62.

[0100] (3-3) A part of the configuration disclosed as the first embodiment or its modified example may be applied to this embodiment.

[0101] <Conclusion> Although the embodiments of the present disclosure have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the present disclosure as defined in the claims.

[0102] 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: Rotating member 61: First opening 62: Second opening 69: Groove 80: Utilization unit 90: Heat source unit 100: Compressor 101 : Refrigeration device B: Lower end of coil (lower end) E: Outer periphery of stator core (outer periphery) L: Lubricating oil P1: Base P2: Outer periphery wall P3: Inner periphery wall R: Refrigerant S: Internal space S1: First space S2: Second space S3: Third space T: Lower end of outer periphery wall (lower end) X: Outer diameter of rotating member (outer diameter) Y: Inner diameter of stator (inner diameter)

[0103] Japanese Patent Application Laid-Open No. 2021-017849

Claims

a casing (10) having an internal space (S); a motor (20) having a cylindrical stator (21), a rotor (25) disposed in the stator, a refrigerant descending passage (54), and a refrigerant ascending passage (50), and disposed in the internal space; a compression mechanism (40) disposed in the internal space and above the motor, forming a first space (S1) between the motor and the compression mechanism for compressing a refrigerant (R); an oil reservoir (14) disposed in the internal space and below the motor, forming a second space (S2) between the motor and the oil reservoir; a crankshaft (30) that transmits rotation of the rotor to the compression mechanism; a rotating member (60) disposed in the second space, rotating together with the rotor, and having 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 passes the refrigerant from the first space to the second space, The refrigerant ascending passage passes the refrigerant from the second space to the first space.

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

3. The compressor according to claim 2, wherein the height difference between the rotating 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 comprises an annular lower insulator (23b) disposed on the lower surface of the stator core, the lower insulator having an outer peripheral wall (P2) extending downward from near the outer periphery of the lower insulator, and the rotating member is disposed higher than a lower end (T) of the outer peripheral wall.

5. A compressor according to any one of claims 1 to 4, wherein the rotating member has a groove (67) extending radially from the center to the periphery.

6. A compressor according to any one of claims 1 to 4, wherein the rotating member has a plurality of grooves (67) extending radially from the center to the periphery.

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

8. A compressor according to any one of claims 1 to 7, wherein the rotor has a rotor body and a lower balance weight (27) provided on the underside of the rotor body, and the rotating member is fixed to the lower balance weight.

9. A compressor according to any one of claims 1 to 7, wherein the rotor has a rotor body and a lower balance weight (27) provided on the underside of the rotor body, and the rotating member is fixed to the rotor body.

10. A compressor as claimed in any one of claims 1 to 7, wherein the rotating member is fixed to the crankshaft.

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

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

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