Compressor and air conditioner

Abstract

To provide a compressor and related equipment that achieve improved efficiency in preheating operation.SOLUTION: A compressor 100 comprises: a sealed container 1; an electric motor 7 installed inside the sealed container 1 and having a stator 71 and a rotor 72; a crankshaft 3 that rotates integrally with the rotor 72; a compression mechanism 2 that compresses a refrigerant in accordance with rotation of the crankshaft 3; and metal members 8 and 9 fixed to an inner peripheral surface of the sealed container 1. The stator 71 includes a stator core 71a and a winding 71b, and the metal members 8 and 9 are arranged on one axial side or on both axial sides of the winding 71b in a state of being positioned close to the winding 71b in an axial direction of the crankshaft 3. During a preheating operation, a high frequency current having a frequency higher than that used during normal operation is supplied through the winding 71b.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to compressors and the like. [Background technology]

[0002] Known compressor-related technology is, for example, that described in Patent Document 1. Patent Document 1 describes a compressor that includes "mounting end plates attached to both axial end faces of a stator core." [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-138591 Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology described in Patent Document 1, distortion of the stator core is suppressed by fixing the stator core to the sealed container via an attachment end plate, but no particular consideration is given to preheating operation of the compressor. In other words, in the technology described in Patent Document 1, the attachment end plate is substantially integrated with the stator core, making it difficult to fully utilize changes in the magnetic field in the stator for preheating operation.

[0005] Therefore, an object of the present disclosure is to provide a compressor or the like that improves the efficiency of preheating operation. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the compressor according to the present disclosure comprises a sealed container, an electric motor installed inside the sealed container and having a stator and a rotor, a drive shaft that rotates integrally with the rotor, a compression mechanism that compresses a refrigerant as the drive shaft rotates, and a metal member fixed to the inner peripheral surface of the sealed container, wherein the stator has a stator core and a winding, and the metal member is arranged on one or both axial sides of the winding in a state close to the winding in the axial direction of the drive shaft, and during preheating operation, a high-frequency current having a frequency higher than that during normal operation flows through the winding. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a compressor or the like that improves the efficiency of preheating operation. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a vertical cross-sectional view of a compressor according to a first embodiment. [Figure 2] FIG. 2 is a perspective view of a metal member included in the compressor according to the first embodiment. [Figure 3] FIG. 2 is a perspective view of a stator core of the compressor according to the first embodiment. [Figure 4] FIG. 2 is an exploded perspective view of a stator and metal members of the compressor according to the first embodiment. [Figure 5] FIG. 10 is a perspective view of a metal member included in a compressor according to a second embodiment. [Figure 6] FIG. 11 is a perspective view of a metal member included in a compressor according to a third embodiment. [Figure 7] FIG. 10 is an exploded perspective view including a stator, a metal member, and an insulating member of a compressor according to a fourth embodiment. [Figure 8] FIG. 10 is a configuration diagram of an air conditioner according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] First Embodiment <Compressor configuration> FIG. 1 is a vertical cross-sectional view of a compressor 100 according to the first embodiment. The compressor 100 shown in Fig. 1 is a scroll compressor that compresses a gaseous refrigerant. As shown in Fig. 1, the compressor 100 includes a sealed container 1, a compression mechanism 2, a crankshaft 3 (drive shaft), a main bearing 4, and an orbiting bearing 5. In addition to the components described above, the compressor 100 also includes balance weights 61 to 63, an electric motor 7, metal members 8 and 9, and an oil introducing member 10.

[0010] The sealed container 1 is a metal container that houses the compression mechanism 2, crankshaft 3, electric motor 7, metal members 8 and 9, etc., and is substantially sealed. Lubricating oil is sealed in the sealed container 1 and is stored as an oil reservoir R1 at the bottom of the sealed container 1. The sealed container 1 includes a cylindrical chamber 1a, a lid chamber 1b that closes the upper opening of the cylindrical chamber 1a, and a bottom chamber 1c that closes the lower opening of the cylindrical chamber 1a.

[0011] A suction pipe P1 is inserted and fixed into the cover chamber 1b of the sealed container 1. The suction pipe P1 is a pipe that guides the refrigerant to a suction chamber (not shown) of the compression mechanism 2. A discharge pipe P2 is inserted and fixed into the cylindrical chamber 1a of the sealed container 1. The discharge pipe P2 is a pipe that guides the refrigerant compressed by the compression mechanism 2 to the outside of the compressor 100.

[0012] The compression mechanism 2 is a mechanism that compresses the refrigerant in accordance with the rotation of the crankshaft 3 (drive shaft). The compression mechanism 2 includes a fixed scroll 21, an orbiting scroll 22, an Oldham ring 23, and a frame 24, and is disposed in the upper space within the sealed container 1.

[0013] The fixed scroll 21 is a member that forms the compression chamber C1 together with the orbiting scroll 22. The fixed scroll 21 is installed on the upper side of a frame 24 and fixed to the frame 24 with a plurality of bolts. As shown in FIG. 1, the fixed scroll 21 includes a base plate 21a, a support portion 21b, and a fixed wrap 21c, which are integrally formed.

[0014] The base plate 21a is a thick portion that has a circular shape in a plan view. The support portion 21b is a cylindrical portion that supports the base plate 21a, and is provided on the peripheral edge of the base plate 21a so as to surround the fixed wrap 21c. The annular lower surface of the support portion 21b forms a mirror plate surface. The height position of this mirror plate surface is approximately equal to the height position of the tooth tip of the fixed wrap 21c. The fixed wrap 21c has a spiral shape and extends downward from the base plate 21a.

[0015] The orbiting scroll 22 is a member that orbits in conjunction with the rotation of the crankshaft 3 and forms a compression chamber C1 between itself and the fixed scroll 21. The orbiting scroll 22 is disposed opposite the fixed scroll 21 with its central axis eccentric by a predetermined distance from the central axis of the fixed scroll 21.

[0016] As shown in FIG. 1, the orbiting scroll 22 includes an end plate 22a, an orbiting wrap 22b, and a boss portion 22c, which are integrally formed. The end plate 22a is a portion that slides between the end plate 22a and the fixed scroll 21 and is disk-shaped. The sliding surface of the end plate 22a between the end plate 22a and the fixed scroll 21 is the end plate surface of the orbiting scroll 22. The orbiting wrap 22b is spiral-shaped and extends upward from the end plate 22a. The boss portion 22c is a cylindrical portion that fits onto the eccentric portion 3b of the crankshaft 3 and extends downward from the center of the back surface of the end plate 22a.

[0017] A compression chamber C1 is formed between the spiral fixed wrap 21c and the spiral orbiting wrap 22b. The compression chamber C1 is a space for compressing a gaseous refrigerant, and is formed on each of the outer and inner line sides of the orbiting wrap 22b. A discharge port K1 is provided near the center of the base plate 21a of the fixed scroll 21, and guides the refrigerant compressed in the compression chamber C1 to a discharge space C2 above the compression mechanism 2. The refrigerant discharged into the discharge space C2 via this discharge port K1 is guided below the compression mechanism 2 via a predetermined gap between the sealed container 1 and the compression mechanism 2.

[0018] The Oldham ring 23 is a ring-shaped member that receives the eccentric rotation of the eccentric portion 3b and orbits the orbiting scroll 22 without rotating on its axis. The Oldham ring 23 is installed on the orbiting scroll 22 and a frame 24.

[0019] The frame 24 is a member for supporting the fixed scroll 21 and for fixing the main bearing 4, and has a generally rotationally symmetrical shape. The frame 24 is fixed to the inner peripheral surface of the cylindrical chamber 1a and is also fixed with bolts to the underside of the fixed scroll 21. The frame 24 is provided with an insertion hole (reference number not shown) for the crankshaft 3.

[0020] The crankshaft 3 (drive shaft) is a shaft that rotates integrally with the rotor 72 of the electric motor 7 and extends in the vertical direction. As shown in FIG. 1, the crankshaft 3 includes a main shaft portion 3a and an eccentric portion 3b that extends upward from the main shaft portion 3a. The main shaft portion 3a is fixed coaxially to the rotor 72 of the electric motor 7 and rotates integrally with the rotor 72. The eccentric portion 3b is a shaft that rotates eccentrically with respect to the main shaft portion 3a, and as described above, is fitted into the boss portion 22c of the orbiting scroll 22. The eccentric rotation of the eccentric portion 3b causes the orbiting scroll 22 to orbit.

[0021] As shown in FIG. 1, an oil supply passage 3c through which lubricating oil flows is provided axially inside the crankshaft 3. A tubular oil introduction member 10 extending in the axial direction of the crankshaft 3 is installed near the lower end of the crankshaft 3. The oil introduction member 10 is a tubular member that sucks up lubricating oil from an oil reservoir R1 at the bottom of the sealed container 1 and guides it to the oil supply passage 3c, and is inserted into the oil supply passage 3c. As the electric motor 7 drives, the pressure difference between the upper and lower sides of the crankshaft 3 causes the lubricating oil to be sucked up sequentially through the oil introduction member 10 and the oil supply passage 3c. This ensures that the compression mechanism 2, main bearing 4, and orbiting bearing 5 are adequately lubricated.

[0022] The main bearing 4 rotatably supports the upper part of the main shaft portion 3a relative to the frame 24. The main bearing 4 is installed on the peripheral wall surface of an insertion hole (reference number not shown) in the frame 24 for the crankshaft 3. While FIG. 1 shows an example in which a roller bearing is used as the main bearing 4, other types of bearings such as a plain bearing or a ball bearing may also be used. The orbiting bearing 5 rotatably supports the eccentric portion 3b with respect to the boss portion 22c of the orbiting scroll 22, and is installed on the inner peripheral surface of the boss portion 22c. As such an orbiting bearing 5, for example, a plain bearing is used.

[0023] The balance weights 61 to 63 are members for suppressing vibration of the compressor 100. In the example of FIG. 1, the balance weight 61 is attached to the crankshaft 3. More specifically, the balance weight 61 is attached to the crankshaft 3 between the orbiting scroll 22 and the main bearing 4. The other balance weights 62 and 63 are attached to the rotor 72 of the electric motor 7. More specifically, one balance weight 62 is attached to the upper side of the rotor 72, and the other balance weight 63 is attached to the lower side of the rotor 72. The number and locations of the balance weights can be changed as appropriate.

[0024] The electric motor 7 is a drive source that rotates the crankshaft 3, and is installed inside the sealed container 1. For example, a permanent magnet synchronous motor is used as the electric motor 7, but other types of motors may also be used. The electric motor 7 includes a stator 71 and a rotor 72, and is installed below the compression mechanism 2.

[0025] The stator 71 has a stator core 71a and windings 71b, and is fixed to the inner circumferential surface of the cylindrical chamber 1a. The stator core 71a is a cylindrical member configured by stacking electromagnetic steel sheets in the axial direction. The windings 71b are wound around the stator core 71a in a predetermined manner via an insulating insulator (not shown). When a predetermined current flows through the windings 71b, magnetic attractive and repulsive forces are generated between the stator 71 and the rotor 72, causing the rotor 72 to rotate.

[0026] The rotor 72 rotates around the central axis of the crankshaft 3 and is disposed radially inside the stator 71. The rotor 72 is configured, for example, with a cylindrical rotor core having multiple permanent magnets embedded in it. The crankshaft 3 is fixed to the rotor 72 so as to be coaxial with the central axis of the rotor 72.

[0027] The metal members 8 and 9 are metallic members that generate heat by electromagnetic induction during preheating operation of the compressor 100, and are fixed to the inner circumferential surface of the sealed container 1. In the example of FIG. 1, the metal member 8 is installed above the winding 71b. Furthermore, another metal member 9 is installed below the winding 71b. These metal members 8 and 9 are located close to the winding 71b. In other words, the metal members 8 and 9 are located on both axial sides of the winding 71b, close to the winding 71b in the axial direction of the crankshaft 3 (drive shaft).

[0028] Here, "close to" means that the metal members 8 and 9 are arranged slightly apart from the winding 71b. The vertical distance between the metal members 8 and 9 and the winding 71b may be, for example, 0.1 mm or more and 3 mm or less, but is not limited to this. The distance between the metal members 8 and 9 and the winding 71b is appropriately set so as to ensure a predetermined insulation distance (a distance sufficient to prevent dielectric breakdown). By placing the metal members 8 and 9 close to the winding 71b, eddy currents are more likely to be generated in the metal members 8 and 9 due to electromagnetic induction when a high-frequency current flows through the winding 71b during preheating operation.

[0029] For example, a metal having a higher volume resistivity than the stator core 71a is used as the material for such metal members 8 and 9. A magnetic conductor may also be used as the material for the metal members 8 and 9. Specifically, the material for the metal members 8 and 9 may be stainless steel, iron, brass, or a predetermined alloy, but is not limited to these.

[0030] <About electromagnetic induction heating> For example, when the compressor 100 is used in a cold region, the compressor 100 may be started when the ambient temperature is low. In conventional technology, the compressor is started after the lubricating oil is warmed by heating the bottom of the compressor with a heater so that an oil film is formed on the sliding parts such as bearings. However, this tends to increase the amount of power consumption.

[0031] Therefore, in the first embodiment, a control device (not shown) performs a predetermined preheating operation before starting the compressor 100, thereby warming the lubricating oil at the bottom of the compressor 100. That is, during the preheating operation, a high-frequency current having a higher frequency than during normal operation of the compressor 100 is caused to flow through the winding 71b. The frequency of such a high-frequency current is high enough that the rotor 72 cannot follow changes in the magnetic flux, and therefore the rotor 72 is maintained in a stopped state during the preheating operation.

[0032] Incidentally, the "high frequency current" during preheating operation may be a sinusoidal AC current, or may be a DC current with AC current superimposed on it. Other currents that have a non-sinusoidal waveform and missing-phase currents (for example, currents for two of the three phases) are also considered to be "high frequency currents" if they have a higher frequency than that during normal operation.

[0033] When a high-frequency current flows through winding 71b, an eddy current (induced current) flows through metal members 8 and 9 that are close to winding 71b, causing the metal members 8 and 9 to heat up due to eddy current loss. As a result, the heat from metal members 8 and 9 is transferred to the lubricating oil in oil reservoir R1 via metal sealed container 1, warming the lubricating oil. This allows an oil film to be formed on sliding parts such as bearings even immediately after compressor 100 is started, thereby suppressing wear and seizure of the sliding parts.

[0034] Furthermore, even when a large amount of liquid refrigerant is stored inside the sealed container 1 (a so-called stagnant state), the heat of the metal members 8 and 9 is transferred to the sealed container 1, so that the liquid refrigerant is appropriately gasified inside the sealed container 1. As a result, liquid compression can be prevented from occurring immediately after the compressor 100 is started.

[0035] Next, the configuration of the metal members 8, 9 will be described in detail. Since the metal members 8, 9 have the same configuration, only the configuration of one of the metal members 8 will be described, and the description of the other metal member 9 will be omitted. In the following description, the "axial direction" means a direction parallel to the axial direction of the crankshaft 3.

[0036] FIG. 2 is a perspective view of a metal member 8 provided in the compressor. As described above, the metal member 8 is a metal member for promoting heating of the lubricating oil during the preheating operation of the compressor 100. Such a metal member 8 is formed, for example, by casting, forging, punching, or bending. As shown in Fig. 2, the metal member 9 includes an annular portion 81 having an annular shape in a plan view, and a plurality of claw portions 82 provided on the outer periphery of the annular portion 81.

[0037] The annular portion 81 has an annular shape in a plan view and is a thin plate. A circular hole H1 is provided in the center of the annular portion 81. When the metal member 8 is installed inside the sealed container 1, the plate surface of the annular portion 81 is perpendicular to the axial direction of the crankshaft 3 (see FIG. 1).

[0038] The inner diameter of the annular portion 81 is sized so that the annular portion 81 does not interfere with the frame 24 (see FIG. 1). In plan view, the inner peripheral edge of the annular portion 81 is preferably positioned radially inward relative to the inner peripheral edge of the winding 71b (see FIG. 1), and the outer peripheral edge of the annular portion 81 is preferably positioned radially outward relative to the outer peripheral edge of the winding 71b (see FIG. 1). In other words, the inner diameter of the annular portion 81 is preferably smaller than the inner diameter of the winding 71b, and the outer diameter of the annular portion 81 is preferably longer than the outer diameter of the winding 71b.

[0039] The inner diameter of winding 71b (see FIG. 1) is the diameter of a circle passing through the inner circumferential edge (inner peripheral edge) of winding 71b when viewed from above. The outer diameter of winding 71b is the diameter of a circle passing through the outer circumferential edge (outer peripheral edge) of winding 71b when viewed from above. The above-described configuration ensures that an area of ​​annular portion 81 overlaps with winding 71b in the axial direction, making it easier for eddy currents to be generated in annular portion 81 when a high-frequency current flows through winding 71b.

[0040] As shown in Fig. 2, the annular portion 81 has a plurality of radial notches N1. In the example shown in Fig. 2, a total of nine notches N1 are provided at equal intervals in the circumferential direction. Each notch N1 is cut out radially outward from the inner peripheral edge of the annular portion 81.

[0041] In plan view, it is preferable that each notch N1 overlaps with a gap between circumferentially adjacent windings 71b (see FIG. 4). This prevents the flow of refrigerant flowing in the vertical direction through the gap between windings 71b from being obstructed by metal member 8. As a result, it is possible to prevent the lubricating oil mixed in the refrigerant from being agitated by collision with metal member 8, and ultimately to prevent the lubricating oil from leaking from compressor 100 (see FIG. 1).

[0042] Incidentally, the V-phase winding 71b, the U-phase winding 71b, and the W-phase winding 71b are arranged in sequence in the circumferential direction in the electric motor 7 (see FIG. 1). Therefore, the metal member 8 is arranged so that the notch N1 overlaps in the vertical direction with the gaps between the U-phase and V-phase windings 71b, 71b, the gaps between the V-phase and W-phase windings 71b, 71b, and the gaps between the W-phase and U-phase windings 71b.

[0043] It is also preferable that the radially outer end of the notch N1 is positioned radially outward from the outer circumferential edge of the winding 71b (see FIG. 1) in plan view, so that the refrigerant blown up through the gap between the windings 71b is guided directly upward through the notch N1.

[0044] The multiple claws 82 shown in Fig. 2 are portions that are fixed to the inner peripheral surface of the sealed container 1 (see Fig. 1) by press-fitting or the like, and are provided on the outer peripheral edge of the annular portion 81. In the example of Fig. 2, a total of nine claws 82 are provided at equal intervals in the circumferential direction. The circumferential positions of the claws 82 correspond to the positions of the notches N1 of the annular portion 81. In other words, the claws 82 are provided radially outward of the notches N1.

[0045] Each of the claws 82 has a connecting portion 82a extending in the radial direction and a contact portion 82b extending in the axial direction from the connecting portion 82a, and has an L-shaped vertical cross section. The connecting portion 82a is a portion connected to the annular portion 81, and extends radially outward from the outer circumferential edge of the annular portion 81. The outer circumferential edge of the annular portion 81 is a circle that passes through the outer circumferential edge (arcuate edge) of the annular portion 81 between adjacent claws 82, 82 in the circumferential direction.

[0046] When the metal member 8 is installed in the sealed container 1 (see FIG. 1), a total of nine flow paths are formed by the outer circumferential edge of the annular portion 81, the radial edges of each connecting portion 82a, and the inner circumferential surface of the sealed container 1 (see FIG. 1). Directly below these flow paths, groove V1 (see FIG. 3) of the stator core 71a (see FIG. 4) is provided. The refrigerant compressed in the compression mechanism 2 (see FIG. 1) is guided downward sequentially through the above-mentioned flow paths and groove V1.

[0047] 2 is a portion that comes into contact with the inner peripheral surface of the sealed container 1 (see FIG. 1), and extends axially upward from the radially outer end of the connecting portion 82a. When the metal member 8 is installed in the sealed container 1 by press-fitting or the like, the claw portion 82 elastically deforms and comes into close contact with the inner peripheral surface of the sealed container 1.

[0048] In addition, it is preferable that the axial length L1 of each claw portion 82 is shorter than the axial length L2 (see FIG. 1) of the portion of the winding 71b (see FIG. 1) that extends outside the stator core 71a (L1 < L2). By doing so, since the surface area of the claw portion 82 becomes relatively narrow, when the compressor 100 is operating normally, it is possible to suppress excessive heat transfer from the metal member 8 to the gas refrigerant inside the sealed container 1 (see FIG. 1). Therefore, it is possible to suppress a decrease in the efficiency of the compressor 100 (see FIG. 1) due to an increase in the temperature of the refrigerant.

[0049] Also, it is preferable that the axial length L1 of each claw portion 82 is shorter than the radial length L3 of the annular portion 81 (L1 < L3: see FIG. 2). Even with such a configuration, since the surface area of the claw portion 82 becomes relatively narrow, it is possible to suppress the temperature of the gas refrigerant from rising too much due to the heat of the metal member 8 during normal operation.

[0050] FIG. 3 is a perspective view of the stator core 71a of the compressor. As shown in FIG. FIG. 3, the stator core 7la includes a yoke 711a and a plurality of teeth 712a. The yoke 711a is an annular yoke in a plan view that forms part of the magnetic circuit. On the outer peripheral surface of the yoke 711a, grooves V1 parallel to the axial direction are provided at positions corresponding to the teeth 71Z2a. These grooves V1 are configured to be recessed radially inward from the outer peripheral surface of the stator 71. Then, the refrigerant compressed by the compression mechanism portion 2 is guided downward through the gap between the wall surface of the groove V1 and the sealed container 1 (see FIG. 1).

[0051] The teeth 712a are portions around which the winding 71b (see FIG. 4) is wound via an insulating insulator (not shown), and extend radially inward from the yoke 711a. In the example of FIG. 3, a total of nine teeth 712a are provided at equal intervals in the circumferential direction. The slot 713a is the space between adjacent teeth 712a, 712a in the circumferential direction. The windings 71b (see FIG. 4) of the U phase, V phase, and W phase are accommodated in each slot 了13a. Note that the configuration of the stator core 71a shown in FIG. 3 is an example and is not limited thereto.

[0052] FIG. 4 is an exploded perspective view of the stator 71 and the metal member 8 of the compressor. As described above, the circumferential position of the notch N1 of the metal member 8 corresponds to the position of the gap between the windings 71b, 71b. This prevents the metal member 8 from blocking the flow of refrigerant that passes through the gap between the windings 71b, 71b. Furthermore, the claws 82 of the metal member 8 are located between the grooves V1, V1 of the stator 71 in plan view. This prevents the claws 82 from blocking the flow of refrigerant toward the groove V1.

[0053] In the example of Fig. 4, in the metal member 8 provided on the upper side of the stator 71, the claw portions 82 extend upward from the outer periphery of the annular portion 81. On the other hand, in the metal member 9 (see Fig. 1) provided on the lower side of the stator 71, the claw portions (no reference numeral is shown in Fig. 1) extend downward from the annular portion (no reference numeral is shown in Fig. 1). Note that the direction in which the claw portions 82 of the metal member 8 and the claw portions of the other metal member 9 extend in the axial direction can be changed as appropriate.

[0054] <Effects> According to the first embodiment, the metal members 8 and 9 are provided adjacent to the winding 71b. When a high-frequency current flows through the winding 71b during preheating operation, eddy currents are generated in the metal members 8 and 9. As a result, the metal members 8 and 9 generate heat, and the heat is transferred to the lubricating oil in the oil reservoir R1 via the sealed container 1, warming the lubricating oil. Therefore, even in cold climates, an oil film can be formed on the sliding parts, such as bearings, immediately after the compressor 100 is started, thereby suppressing wear and seizure of the sliding parts. Furthermore, even when a large amount of liquid refrigerant accumulates inside the sealed container 1, the heat of the metal members 8 and 9 causes the liquid refrigerant to evaporate appropriately and become a gas refrigerant, preventing liquid compression in the compressor 100. Thus, according to the first embodiment, a compressor 100 with high performance and reliability can be provided.

[0055] Furthermore, since the lubricating oil is heated by electromagnetic induction using the metal members 8, 9, the efficiency of the preheating operation of the compressor 100 can be improved. Furthermore, since there is no particular need to provide a separate heater (not shown) for warming the lubricating oil during the preheating operation, the manufacturing cost of the compressor 100 can be reduced. Furthermore, in the first embodiment, a predetermined flow path is provided between the claw portions 82, 82 adjacent to each other in the circumferential direction, and a plurality of notches N1 are provided in the annular portion 81. This makes it possible to prevent the flow of refrigerant inside the sealed container 1 from being obstructed by the metal members 8, 9.

[0056] Second Embodiment The second embodiment differs from the first embodiment in that the annular portion 81A (see FIG. 5) of the metal member 8A (see FIG. 5) is provided with a protrusion A2 (see FIG. 5). The rest of the second embodiment is the same as the first embodiment. Therefore, only the parts that are different from the first embodiment will be described, and a description of the overlapping parts will be omitted.

[0057] FIG. 5 is a perspective view of a metal member 8A included in the compressor according to the second embodiment. 5, the metal member 8A includes an annular portion 81A and a claw portion 82. The annular portion 81A is a portion that has an annular shape in a plan view, and includes a plurality of extending portions A1 and a plurality of protruding portions A2.

[0058] The extension portion A1 is a portion that extends radially inward from the base end (the lower end in FIG. 5) of the claw portion 82. In the example of FIG. 5, the circumferential angular range of the extension portion A1 is substantially the same as the circumferential angular range of the claw portion 82. Each extension portion A1 is provided with one notch N1. Note that the configuration of the notch N1 is the same as in the first embodiment, and therefore description thereof will be omitted.

[0059] The protruding portion A2 is a portion that protrudes from the extending portion A1 in the axial direction (upward in FIG. 5). The protruding portion A2 is provided between the extending portions A1, A1 that are adjacent in the circumferential direction, and is fan-shaped in a plan view. As shown in FIG. 5, the protruding portion A2 has a pair of side portions A21, A22 and a flat portion A23 that is continuous with the side portions A21, A22. The pair of side portions A21, A22 form the side surfaces on both sides of the protruding portion A2. The side portions A21, A22 extend in the axial direction (upward in the example of FIG. 5) from the radial edge of the extending portion A1. The flat portion A23 is a flat portion that connects the pair of side portions A21, A22, and is fan-shaped in a plan view.

[0060] It is preferable that the cross-sectional shape of protruding portion A2 when cut along a cylindrical surface (not shown) whose central axis is the axis of crankshaft 3 (drive shaft: see FIG. 1) corresponds to the outer shape of the portion of winding 71b (see FIG. 4) that protrudes outside stator core 71a. Furthermore, it is preferable that a part of the side surface of protruding portion A2 (for example, the lower portion) overlaps winding 71b (see FIG. 4) in the circumferential direction.

[0061] With this configuration, the total area of ​​the portion of the metal member 8A that overlaps with the winding 71b in the axial and circumferential directions is larger than in the first embodiment (see FIG. 2). That is, since the metal member 8A is close to the winding 71b not only in the axial direction but also in the circumferential direction, eddy currents are likely to be generated in the metal member 8A due to the high-frequency current in the winding 71b. Note that the cross-sectional shape of the protruding portion A2 does not necessarily have to be the same as the outer shape of the winding 71b, and it may have a shape that is slightly different from the outer shape of the winding 71b.

[0062] The other metal member (not shown in FIG. 5) provided below the electric motor 7 (see FIG. 1) has the same configuration as the metal member 8A described above, and therefore description thereof will be omitted.

[0063] <Effects> According to the second embodiment, the annular portion 81A of the metal member 8A has a protrusion A2, and a portion of this protrusion A2 circumferentially overlaps the winding 71b. This makes it easier for eddy currents to be generated in the metal member 8A when a high-frequency current flows through the winding 71b during preheating operation, thereby enabling the lubricating oil to be heated more efficiently than in the first embodiment.

[0064] Third Embodiment The third embodiment differs from the second embodiment in that an inner circumferential wall B3 (see FIG. 6) and an outer circumferential wall B4 (see FIG. 6) are provided on the protruding portion B2 (see FIG. 6) of the metal member 8B (see FIG. 6). The rest of the third embodiment is the same as the second embodiment. Therefore, only the parts that differ from the second embodiment will be described, and a description of the overlapping parts will be omitted.

[0065] FIG. 6 is a perspective view of a metal member 8B included in the compressor according to the third embodiment. 6, the metal member 8B includes an annular portion 81B and claw portions 82. The annular portion 81B is a portion that has an annular shape in a plan view, and includes an extending portion B1, a protruding portion B2, an inner circumferential wall B3, and an outer circumferential wall B4. Note that the extending portion B1 and the protruding portion B2 have the same configuration as the extending portion A1 (see FIG. 5) and the protruding portion A2 (see FIG. 5) in the second embodiment, and therefore description thereof will be omitted.

[0066] The inner circumferential wall B3 shown in FIG. 6 is a circumferential wall provided on the inner circumferential edge of the protruding portion B2. The inner circumferential wall B3 extends downward from the inner circumferential edge of the upper surface of the protruding portion B2. The height position of the lower end of the inner circumferential wall B3 is, for example, approximately equal to the height position of the extending portion B1. The inner circumferential wall B3 is also provided radially inside the winding 71b (see FIG. 1), and a portion of the inner circumferential wall B3 (for example, a lower portion) overlaps the winding 71b in the radial direction. With this configuration, because the inner circumferential wall B3 overlaps the winding 71b in the radial direction, eddy currents are also likely to be generated in the inner circumferential wall B3 during preheating operation.

[0067] The outer peripheral wall B4 shown in FIG. 6 is a peripheral wall provided on the outer peripheral edge of the protruding portion B2. The outer peripheral wall B4 extends downward from the outer peripheral edge of the upper surface of the protruding portion B2. The height position of the lower end of the outer peripheral wall B4 is, for example, approximately equal to the height position of the extending portion B1. Furthermore, the outer peripheral wall B4 is provided radially outside the winding 71b (see FIG. 1), and a portion (for example, a lower portion) of the outer peripheral wall B4 overlaps the winding 71b in the radial direction. With this configuration, because the outer peripheral wall B4 overlaps the winding 71b in the radial direction, eddy currents are also likely to be generated in the outer peripheral wall B4 during preheating operation.

[0068] The other metal member (not shown in FIG. 6) provided below the electric motor 7 (see FIG. 1) has the same configuration as the metal member 8B described above, and therefore a description thereof will be omitted.

[0069] <Effects> According to the third embodiment, the inner circumferential wall B3 and the outer circumferential wall B4 of the metal member 8B overlap the winding 71b in the radial direction, so that eddy currents can be generated in the inner circumferential wall B3 and the outer circumferential wall B4 during preheating operation, thereby enabling the lubricating oil to be heated more efficiently than in the second embodiment.

[0070] Fourth Embodiment The fourth embodiment differs from the first embodiment in that an insulating member 31 (see FIG. 7) is interposed between a metal member 8 (see FIG. 7) and a stator 71 (see FIG. 7). The remaining features are the same as those of the first embodiment. Therefore, only the parts that differ from the first embodiment will be described, and a description of the overlapping parts will be omitted.

[0071] FIG. 7 is an exploded perspective view including a stator 71, a metal member 8, and an insulating member 31 of a compressor according to the fourth embodiment. 7 is a plate- or film-like member used to insulate the metal member 8 from the winding 71b, and is interposed between the metal member 8 and the winding 71b. The insulating member 31 is generally annular in plan view and is a thin plate. The inner and outer diameters of the insulating member 31 are, for example, approximately the same as the inner and outer diameters of the annular portion 81 of the metal member 8.

[0072] Examples of materials that can be used to form the insulating member 31 include, but are not limited to, polyethylene terephthalate (PET) and polyethylene naphthalate (PEN).

[0073] The insulating member 31 may be attached to the lower surface (the surface on the stator 71 side) of the metal member 8, or may be fixed to the metal member 8 by a predetermined fixing means. Regarding the positional relationship between the insulating member 31 and the winding 71b, the insulating member 31 may be in contact with the winding 71b, or may be slightly spaced apart from the winding 71b.

[0074] 7, insulating member 31 is provided with a plurality of notches N2. Each notch N2 is cut out radially outward from the inner circumferential edge of insulating member 31. The position and range of these notches N2 correspond to the position and range of notches N1 provided in annular portion 81 of metal member 8. In other words, notch N2 of insulating member 31 is provided directly below notch N1 of annular portion 81. This prevents the flow of refrigerant flowing in the vertical direction through the gap between windings 71b, 71b from being obstructed by metal member 8 or insulating member 31.

[0075] It should be noted that an insulating member (not shown) is also interposed between a metal member (not shown in FIG. 7) and winding 71b on the lower side of electric motor 7 (see FIG. 1).

[0076] <Effects> According to the fourth embodiment, the insulating member 31 is interposed between the metal member 8 and the winding 71b, which ensures insulation between the metal member 8 and the winding 71b. This makes it possible to further improve the reliability of the compressor compared to the first embodiment.

[0077] Fifth Embodiment In the fifth embodiment, an air conditioner W1 (see FIG. 8) including a compressor 100 (see FIG. 8) having the configuration described in the first embodiment will be described. Note that the configuration of the compressor 100 is the same as in the first embodiment, and therefore description thereof will be omitted.

[0078] FIG. 8 is a configuration diagram of an air conditioner W1 according to the fifth embodiment. The solid arrows in FIG. 8 indicate the flow of the refrigerant in the heating cycle. The dashed arrows in FIG. 8 indicate the flow of the refrigerant in the cooling cycle. The air conditioner W1 is a device that performs air conditioning such as cooling and heating. As shown in Fig. 8, the air conditioner W1 includes, as components provided in the outdoor unit U1, a compressor 100, an outdoor heat exchanger 11, an outdoor fan 12, an expansion valve 13, and a four-way valve 14. The air conditioner W1 also includes, as components provided in the indoor unit U2, an indoor heat exchanger 15 and an indoor fan 16.

[0079] The compressor 100 is a device that compresses a low-temperature, low-pressure gas refrigerant and discharges it as a high-temperature, high-pressure gas refrigerant, and has a configuration similar to that of the first embodiment (see FIG. 1). Although not shown in FIG. 8, an accumulator for separating the refrigerant into gas and liquid is connected to the suction side of the compressor 100.

[0080] The outdoor heat exchanger 11 is a heat exchanger in which heat is exchanged between a refrigerant flowing through its heat transfer tubes and outside air sent in from an outdoor fan 12. The outdoor fan 12 is a fan that sends outside air into the outdoor heat exchanger 11. The outdoor fan 12 has an outdoor fan motor 12a that serves as a drive source, and is installed near the outdoor heat exchanger 11.

[0081] The expansion valve 13 is a valve that reduces the pressure of the refrigerant condensed in the "condenser" (one of the outdoor heat exchanger 11 and the indoor heat exchanger 15). The refrigerant reduced in pressure by the expansion valve 13 is guided to the "evaporator" (the other of the outdoor heat exchanger 11 and the indoor heat exchanger 15). The indoor heat exchanger 15 is a heat exchanger in which heat is exchanged between the refrigerant flowing through its heat transfer tubes (not shown) and the indoor air (air in the air-conditioned room) sent in from the indoor fan 16. The indoor fan 16 is a fan that sends indoor air to the indoor heat exchanger 15. The indoor fan 16 is provided with an indoor fan motor 16a that serves as a drive source, and is installed near the indoor heat exchanger 15.

[0082] The four-way valve 14 is a valve that switches the refrigerant flow path depending on the operation mode of the air conditioner W1. For example, during cooling operation (see the dashed arrow in FIG. 8), the refrigerant circulates sequentially through the compressor 100, the outdoor heat exchanger 11 (condenser), the expansion valve 13, and the indoor heat exchanger 15 (evaporator). During heating operation (see the solid arrow in FIG. 8), the refrigerant circulates sequentially through the compressor 100, the indoor heat exchanger 15 (condenser), the expansion valve 13, and the outdoor heat exchanger 11 (evaporator). The air that has exchanged heat with the refrigerant flowing through the indoor heat exchanger 15 is then blown out of the indoor unit U2 into the air-conditioned room.

[0083] <Effects> According to the fifth embodiment, the air conditioner W1 is equipped with a compressor 100 having the same configuration as that of the first embodiment. Therefore, the preheating operation of the compressor 100 can be performed with high efficiency, thereby improving the performance and reliability of the air conditioner W1.

[0084] <<Variations>> The compressor 100 and the air conditioner W1 according to the present disclosure have been described above in the various embodiments, but the present disclosure is not limited to these descriptions and can be modified in various ways. For example, in each embodiment, the metal members 8 and 9 (see FIG. 1) are provided on both axial sides of the winding 71b (see FIG. 1), but one of these metal members 8 and 9 may be omitted. That is, a metal member may be disposed on one axial side of the winding 71b in proximity to the winding 71b in the axial direction of the crankshaft 3 (drive shaft).

[0085] In addition, in each embodiment, a configuration has been described in which the claw portions 82 extend from the annular portion 81 of the metal member 8 (see FIG. 2) to one side in the axial direction, but this is not limiting. For example, the claw portions 82 included in one metal member may be a mixture of those extending upward and those extending downward from the annular portion 81. Furthermore, the claw portions 82 may extend both upward and downward from the annular portion 81.

[0086] In addition, in each embodiment, the annular portion 81 of the metal member 8 (see FIG. 2) has been described as having a plurality of radial notches N1, but this is not limiting. That is, the annular portion 81 may have a plurality of radial holes (not shown). In plan view, each of the holes overlaps with the gap between the windings 71b, 71b adjacent in the circumferential direction. With this configuration, the same effects as those of the embodiments can be achieved. The same can be said for the other metal member 9 (see FIG. 1).

[0087] In the third embodiment, the metal member 8B (see FIG. 6) has both the inner circumferential wall B3 and the outer circumferential wall B4, but one of the inner circumferential wall B3 and the outer circumferential wall B4 may be omitted. Even with this configuration, the lubricating oil can be heated with high efficiency during preheating operation. In addition, in each embodiment, the compressor 100 is described as a scroll compressor, but this is not limited to this. That is, each embodiment can also be applied to other types of compressors, such as a rotary compressor. In addition, the configuration of the compressor 100 (see FIG. 1) described in the first embodiment is an example, and can be modified as appropriate.

[0088] Furthermore, the respective embodiments can be combined as appropriate. For example, the second embodiment and the fourth embodiment can be combined, and in a configuration in which the metal member 8A has the protrusion A2 (second embodiment: see FIG. 5), an insulating member 31 can be interposed between the metal member 8A and the winding 71b (fourth embodiment: see FIG. 7). Similarly, the third embodiment and the fourth embodiment can be combined. Furthermore, for example, the second embodiment and the fifth embodiment may be combined, and in the compressor 100 of the air conditioner W1 (fifth embodiment: see FIG. 8), the metal member 8A may be configured to have a protrusion A2 (second embodiment: see FIG. 5). In addition, a combination of the third embodiment and the fifth embodiment, or a combination of the fourth embodiment and the fifth embodiment is also possible.

[0089] Furthermore, in the fifth embodiment, a configuration has been described in which the air conditioner W1 (see FIG. 8) is provided with the four-way valve 14, but this is not limiting. That is, the four-way valve 14 may be omitted, and the air conditioner may be dedicated to cooling or heating. Furthermore, the air conditioner W1 (see FIG. 8) described in the fifth embodiment can be applied to various types of air conditioners, such as room air conditioners, package air conditioners, and multi-air conditioners for buildings.

[0090] Furthermore, in the fifth embodiment, the air conditioner W1 (see FIG. 8) including the compressor 100 has been described, but the present invention is not limited to this. For example, the fifth embodiment can also be applied to other refrigeration cycle devices such as a refrigerator, a hot water heater, an air-conditioning hot water heater, and a refrigerator.

[0091] Furthermore, each embodiment has been described in detail to clearly explain the present disclosure, and is not necessarily limited to having all of the configurations described. Furthermore, part of the configuration of each embodiment can be appropriately added to, deleted from, or replaced with other configurations. Furthermore, the mechanisms and configurations described above are those that are considered necessary for the explanation, and do not necessarily represent all mechanisms and configurations of the product. [Explanation of symbols]

[0092] 1. Airtight container 2 Compression mechanism 3 Crankshaft (drive shaft) 4 Main bearing 5 Slewing bearing 7 Electric motor 8, 8A, 8B, 9 Metallic parts 10 Oil introduction member 11 Outdoor heat exchanger 12 Outdoor fan 13 Expansion valve 14 Four-way valve 15 Indoor heat exchanger 16 Indoor fan 31 Insulating material 71 Stator 71a stator core 71b Winding 72 rotor 61,62 Balance weight 81, 81A, 81B Annular section 82 Claw 82a Continuous part 82b Contact part 100 Compressor A1,B1 extension part A2,B2 protrusion B3 Inner wall B4 Outer wall N1 notch V1 groove W1 Air Conditioner

Claims

1. A sealed container and an electric motor installed inside the sealed container and having a stator and a rotor; a drive shaft that rotates integrally with the rotor; a compression mechanism that compresses a refrigerant as the drive shaft rotates; a metal member fixed to the inner circumferential surface of the sealed container, the stator has a stator core and a winding, the metal member is disposed on one axial side or both axial sides of the winding in a state close to the winding in the axial direction of the drive shaft, During preheating operation, a high frequency current having a higher frequency than during normal operation is passed through the windings of the compressor.

2. the metal member has an annular portion having an annular shape in a plan view and a plurality of claw portions provided on an outer circumferential edge of the annular portion, a plate surface of the annular portion is perpendicular to the axial direction, The plurality of claws contact the inner circumferential surface of the sealed container. The compressor according to claim 1 .

3. The axial length of each of the claw portions is shorter than the axial length of a portion of the winding that protrudes outside the stator core. The compressor according to claim 2 .

4. In a plan view, an inner peripheral edge of the annular portion is located radially inward of an inner peripheral edge of the winding, and an outer peripheral edge of the annular portion is located radially outward of an outer peripheral edge of the winding. The compressor according to claim 2 .

5. The annular portion has a plurality of radial notches or holes, In a plan view, each of the notches or holes overlaps a gap between adjacent windings in the circumferential direction. The compressor according to claim 2 .

6. The annular portion has an extending portion extending radially inward from a base end of the claw portion and a protruding portion protruding in the axial direction from the extending portion, a cross-sectional shape of the protruding portion cut along a cylindrical surface having a center axis coincident with the axis of the drive shaft corresponds to an outer shape of a portion of the winding that protrudes outside the stator core, A part of the side surface of the protrusion overlaps with the winding in the circumferential direction. The compressor according to claim 2 .

7. the annular portion has an inner peripheral wall provided on an inner peripheral edge of the protruding portion, the inner circumferential wall is provided radially inward of the winding, A part of the inner circumferential wall overlaps with the winding in the radial direction. The compressor according to claim 6,

8. the annular portion has an outer peripheral wall provided on an outer peripheral edge of the protrusion, the outer peripheral wall is provided radially outward of the winding, A portion of the outer peripheral wall overlaps with the winding in the radial direction. The compressor according to claim 6,

9. A plate-shaped or film-shaped insulating member is provided, The insulating member is interposed between the metal member and the winding. The compressor according to claim 1 .

10. The compressor according to any one of claims 1 to 9 is provided, An air conditioner comprising an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger.

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