Compressor

Abstract

To inhibit wear and seizure of a support part due to rotation of a crank shaft.SOLUTION: A sealed type scroll compressor includes: an electric motor having a rotor which rotates around a center axis C; a crank shaft 11 which is fixed to the rotor and rotates around the center axis C by driving force from the electric motor; and a thrust plate 40 which supports a load acting on the crank shaft 11 in a direction along the center axis C with an upper surface 40a. The thrust plate 40 has Vickers hardness of 700 Hv or more.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a compressor. [Background technology]

[0002] A vertical hermetic compressor accommodates a compression mechanism for compressing a refrigerant and a motor (electric motor) for driving the compression mechanism in a housing. A crankshaft for connecting the compression mechanism and the rotor of the motor is also accommodated in the housing, and the rotational driving force of the motor is transmitted to the compression mechanism via the crankshaft. The crankshaft is arranged so that its axial direction is vertical, and is rotated by the driving force of the motor. For this reason, the crankshaft is supported from below by a thrust bearing provided below the crankshaft. Patent documents that disclose such a hermetic compressor include Patent Document 1 and Patent Document 2.

[0003] Patent Document 1 describes a compressor having a thrust plate, which is a plate-like member provided in contact with the lower end surface of the crankshaft. In this compressor, a groove is formed in the thrust plate in the sliding area between the crankshaft and the thrust plate, and lubricating oil is supplied to the groove from a through hole.

[0004] Patent Document 2 describes a compressor in which the bottom end of the main shaft and a shaft thrust bearing provided on a subframe are in a sliding relationship with each other and constitute a sliding part. In this compressor, the shaft thrust bearing of the subframe is made of the same material as the subframe, such as iron, and the surface of the subframe, including the shaft thrust bearing of the subframe, is coated or film-treated. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2017-155718 A [Patent Document 2] International Publication No. 2009 / 154151 Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, in recent years, compressors have become larger in capacity. As the capacity of compressors increases, there is a tendency for motors with higher output to be used in the compressors. Such motors with higher output have heavy rotors. For this reason, in a compressor using a motor with higher output, the load acting on the crankshaft to which the rotor is fixed in the thrust direction (direction along the central axis of the crankshaft) increases. In addition, when a motor with higher output is used, the electromagnetic force acting in the thrust direction also increases, and it has been found that this electromagnetic force acts on the crankshaft to an extent that cannot be ignored as a load in the thrust direction (direction along the central axis of the crankshaft).

[0007] In the compressor described in Patent Document 1, a groove is formed in the thrust plate in the sliding area between the crankshaft and the thrust plate in order to reduce friction loss. However, the technical idea of ​​increasing the capacity of the compressor or the technical idea of ​​increasing the output of the motor are not disclosed. Furthermore, Patent Document 1 does not take into consideration wear and seizure of the thrust plate, and there is a possibility that wear and seizure of the thrust plate will occur when a motor with high output is applied to the compressor described in Patent Document 1, for example.

[0008] In the compressor described in Patent Document 2, a coating or film treatment is applied to the surface of the subframe including the axial thrust bearing. However, in the compressor described in Patent Document 2, when a refrigerant that is a halogenated hydrocarbon or a hydrocarbon having a carbon double bond in its composition or a mixture containing them is used, the surface of the subframe is coated or film treated in order to suppress decomposition or polymerization of the halogenated hydrocarbon or the double bond of the hydrocarbon having a carbon double bond in its composition in the sliding part of the scroll compressor with which the refrigerant may come into contact. Thus, even in Patent Document 2, wear and seizure of the axial thrust bearing are not taken into consideration. Therefore, in the compressor described in Patent Document 2, for example, when a motor with a large output is applied, there is a possibility that wear and seizure of the thrust plate may occur.

[0009] The present invention has been made in consideration of the above circumstances, and has an object to provide a compressor that can suppress wear and seizure of a support portion caused by rotation of the crankshaft. [Means for solving the problem]

[0010] In order to solve the above problems, the compressor of the present invention employs the following measures. A compressor according to one embodiment of the present invention includes an electric motor having a rotor that rotates about a central axis, a crankshaft that is fixed to the rotor and rotates about the central axis by driving force from the electric motor, and a support part that supports a load acting on the crankshaft in a direction along the central axis by a support surface, and the support surface of the support part has a Vickers hardness of 700 Hv or more.

[0011] In the above configuration, when the electric motor is driven and the rotor rotates about the central axis, the crankshaft fixed to the rotor also rotates about the central axis. Since the crankshaft is supported by the support surface of the support part, the rotation of the crankshaft causes the crankshaft to slide against the support surface. In the above configuration, the hardness of the support surface is increased to a Vickers hardness of 700 Hv or more. This improves the wear resistance and seizure resistance of the support portion. Therefore, wear and seizure of the support portion caused by the rotation of the crankshaft can be suppressed. When the capacity of the compressor is increased and the output of the electric motor used in the compressor is increased accordingly, the load acting on the crankshaft in the direction along the central axis increases, but with the above-mentioned configuration, it is possible to suppress wear and seizure of the support part caused by the rotation of the crankshaft, and therefore it is possible to increase the capacity of the compressor.

[0012] A compressor according to one aspect of the present invention includes an electric motor having a rotor that rotates about a central axis, a crankshaft that is fixed to the rotor and rotates about the central axis by driving force from the electric motor, and a support part that supports a load acting on the crankshaft in a direction along the central axis by a support surface, and the support surface of the support part is provided with a coating layer that is harder than the support surface.

[0013] In the above-mentioned configuration, the support surface is provided with a coating layer having a harder layer than the support surface. This improves the wear resistance and seizure resistance of the support portion. This makes it possible to suppress wear and seizure of the support portion caused by the rotation of the crankshaft. This allows the compressor to have a larger capacity.

[0014] A compressor according to one embodiment of the present invention comprises an electric motor having a rotor rotating about a central axis, a crankshaft fixed to the rotor and rotating about the central axis by driving force from the electric motor, and a support portion that supports a load acting on the crankshaft in a direction along the central axis by a support surface, wherein the crankshaft has a first magnetic material portion that is a magnetic material, and the support portion has a second magnetic material portion that is also a magnetic material, and the first magnetic material portion and the second magnetic material portion are arranged so that the same magnetic poles face each other.

[0015] In the above configuration, the first magnetic body part provided on the crankshaft and the second magnetic body part provided on the support part are arranged so that the same magnetic poles face each other. As a result, the first magnetic body part and the second magnetic body part repel each other, thereby reducing the load from the crankshaft acting on the support surface of the support part. This makes it possible to suppress wear and seizure of the support part caused by the rotation of the crankshaft. This makes it possible to increase the capacity of the compressor.

[0016] In the compressor according to one aspect of the present invention, a concave groove may be formed in the support surface of the support portion, and lubricating oil may be supplied to the groove.

[0017] In the above configuration, a groove is formed on the support surface, and lubricating oil is supplied to the groove. By supplying the lubricating oil to the groove, an oil film is formed between the support surface and the crankshaft. This improves the wear resistance and seizure resistance of the support. Therefore, wear and seizure of the support caused by the rotation of the crankshaft can be suppressed. This allows the compressor to have a large capacity.

[0018] In the compressor according to an aspect of the present invention, the electric motor may have an output of 15 kW or more.

[0019] In the above configuration, the output of the electric motor is 15 kW or more. When an electric motor with a large output is used, the load acting on the crankshaft in the direction along the central axis increases due to the weight of the rotor and the increase in electromagnetic force. In the above configuration, the wear resistance and seizure resistance of the support part can be improved, so that even when an electric motor with a large output is used, wear and seizure of the support part caused by the rotation of the crankshaft can be suppressed. Therefore, the capacity of the compressor can be increased. Effect of the Invention

[0020] According to the present invention, wear and seizure of the support portion caused by the rotation of the crankshaft can be suppressed. [Brief description of the drawings]

[0021] [Figure 1] 1 is a vertical sectional view showing a scroll compressor according to a first embodiment of the present invention. [Diagram 2] 2 is a partially enlarged vertical sectional view showing a thrust plate of the scroll compressor of FIG. 1. [Diagram 3] 2 is a vertical cross-sectional view showing a lower end portion of a crankshaft, a thrust plate, and a suction pipe of the scroll compressor of FIG. 1. [Figure 4] FIG. 6 is a partially enlarged vertical sectional view showing a thrust plate of a scroll compressor according to a second embodiment of the present invention. [Diagram 5] FIG. 11 is a partially enlarged vertical sectional view showing a thrust plate of a scroll compressor according to a third embodiment of the present invention. [Figure 6] FIG. 11 is a plan view showing a thrust plate of a scroll compressor according to a third embodiment of the present invention. [Figure 7] FIG. 11 is a vertical cross-sectional view showing an example of a groove portion formed in a thrust plate of a scroll compressor according to a third embodiment of the present invention. [Figure 8] FIG. 11 is a vertical cross-sectional view showing an example of a groove portion formed in a thrust plate of a scroll compressor according to a third embodiment of the present invention. [Figure 9] FIG. 11 is a vertical cross-sectional view showing an example of a groove portion formed in a thrust plate of a scroll compressor according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] [First embodiment] A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. As shown in Fig. 1, a hermetic scroll compressor 1, which is a scroll fluid machine, is provided with a vertically long cylindrical hermetic housing 2 whose bottom is sealed by a lower cover. The upper part of this hermetic housing 2 is sealed by a discharge cover 3 and an upper cover 4, and a discharge chamber 5 into which compressed high-pressure gas is discharged is formed between the discharge cover 3 and the upper cover 4.

[0023] An upper bearing member 6 is fixedly installed at the upper portion within the sealed housing 2, and a scroll compression mechanism 7 is incorporated through the upper bearing member 6, and an electric motor 10 consisting of a stator 8 and a rotor 9 is installed at the lower portion thereof.

[0024] The electric motor 10 is incorporated in the sealed housing 2 by having the stator 8 fixedly installed in the sealed housing. A rotor 9 is disposed inside the stator 8. A crankshaft 11 made of steel is fixed to the rotor 9. When power is supplied to the electric motor 10, the rotor 9 rotates about a central axis C extending in the vertical direction. The electric motor 10 has an output of 15 kW or more. The electric motor 10 can be operated at a rotation speed of 100 rps or more. The rotor 9 of the electric motor 10 has an outer diameter of 80 mm or more. The electric motor 10 is a concentrated winding motor.

[0025] The crankshaft 11 is a member extending along the central axis C. The crankshaft 11 is fixed to the rotor 9, and is rotated about the central axis C by the driving force from the electric motor 10. A crankpin 12, the axis of which is offset by a predetermined dimension, is provided at the upper end of the crankshaft 11. By connecting the crankpin 12 to the scroll compression mechanism 7, the scroll compression mechanism 7 can be driven by the electric motor 10. The crankshaft 11 has an upper portion rotatably supported by a journal bearing portion 6A of the upper bearing member 6, and a lower end portion rotatably supported by a lower journal bearing 13 made of cast iron provided in a lower portion of the sealed housing 2.

[0026] A positive displacement oil pump 14 is provided between the lower journal bearing 13 and the lower end of the crankshaft 11, and is configured to suck in lubricating oil 15 filled in the bottom of the sealed housing 2 via a suction pipe 16 and discharge it to a flow passage 17 drilled in the crankshaft 11 along the axial direction. This lubricating oil 15 can be supplied via the flow passage 17 to parts that require lubrication, such as the upper bearing member 6, the scroll compression mechanism 7, and the lower journal bearing 13. A tapered surface 43 is formed at the lower end of the flow passage 17 so that the diameter of the flow passage 17 increases downward.

[0027] The scroll compression mechanism 7 has an upper bearing member 6 as one of its components, and is equipped with a fixed scroll 18 fixedly installed on the upper bearing member 6, an orbiting scroll 19 slidably supported by a thrust bearing portion 6B of the upper bearing member 6 and meshing with the fixed scroll 18 to form a compression chamber 20, a rotation prevention mechanism 21 such as an Oldham ring that is interposed between the upper bearing member 6 and the orbiting scroll 19 and prevents the orbiting scroll 19 from rotating and allows its orbital motion, and a drive bush 22 and an orbiting bearing 23 that are provided between the crank pin 12 of the crankshaft 11 and a bearing boss 19C provided on the back surface of the orbiting scroll 19 and transmit the rotational force of the crankshaft 11 to the orbiting scroll 19, and are installed on the upper bearing member 6 with the center of the end plate of the fixed scroll 18 connected to the discharge cover 3.

[0028] The fixed scroll 18 includes an end plate 18A and a spiral wrap 18B standing on the end plate 18A, with a discharge port 24 provided at the center of the end plate 18A and a tip seal 25 provided on the wrap tooth tip surface of the spiral wrap 18B. The orbiting scroll 19 includes an end plate 19A and a spiral wrap 19B standing on the end plate 19A, with a bearing boss 19C provided on the back surface of the end plate 19A and a tip seal 26 provided on the wrap tooth tip surface of the spiral wrap 19B.

[0029] The scroll compression mechanism 7 sucks the refrigerant gas sucked into the sealed housing 2 via the suction piping 27 into the compression chamber 20 from the suction port 28 provided on the outer periphery of the fixed scroll 18, and compresses it into a high-temperature, high-pressure gas. This compressed gas is discharged into the discharge chamber 5 via the discharge port 24 provided in the center of the fixed scroll 18 and a discharge valve 29 provided in the discharge cover 3, and is further sent out to the outside of the compressor via the discharge piping 30 connected to the discharge chamber 5.

[0030] As shown in FIG. 2, the thrust plate (supporting portion) 40 is a plate-like member provided such that an upper surface (supporting surface) 40a contacts the lower end surface of the crankshaft 11. The upper surface 40a of the thrust plate 40 supports the load acting on the crankshaft 11 in the direction along the central axis C (thrust direction) from below. The thrust plate 40 is installed between the lower surface of the lower journal bearing 13 and the upper surface of the intake pipe 16. The thrust plate 40 has a thickness of, for example, about 1 to 2 mm. The thrust plate 40 is formed of a high-hardness material. In particular, the thrust plate 40 is formed of a material having a Vickers hardness of 700 Hv or more. Specifically, the thrust plate 40 is formed of an alloy steel such as chromium steel or chromium molybdenum steel that has been subjected to heat treatment (hardening, nitriding, etc.).

[0031] A through hole 41 through which lubricating oil 15 flows is formed in thrust plate 40. Through hole 41, flow passage 51 formed in suction pipe 16 communicates with flow passage 17 formed in crankshaft 11. As a result, as shown in Fig. 3, lubricating oil 15 that has passed through suction pipe 16 flows through through hole 41 in thrust plate 40, and after lubricating oil 15 flows through through hole 41 in thrust plate 40, lubricating oil 15 flows through flow passage 17 in crankshaft 11. A pump rotor 45 of the positive displacement oil supply pump 14 is provided outside the area where the thrust plate 40 contacts the crankshaft 11. The lower surface of the pump rotor 45 is provided so as to be flush with the lower surface of the crankshaft 11.

[0032] According to this embodiment, the following advantageous effects are obtained. In this embodiment, when the electric motor 10 is driven and the rotor 9 of the electric motor 10 rotates about the central axis C, the crankshaft 11 fixed to the rotor 9 also rotates about the central axis C. The crankshaft 11 is supported from below by the thrust plate 40 as its lower end comes into contact with the upper surface 40a of the thrust plate 40. Therefore, as the crankshaft 11 rotates, the lower end of the crankshaft 11 slides against the upper surface 40a of the thrust plate 40.

[0033] In this embodiment, the thrust plate 40 is made of a material with a Vickers hardness of 700 Hv or more. That is, the thrust plate 40 is made of a high-hardness material in the sliding area where the crankshaft 11 slides. This improves the wear resistance and seizure resistance of the thrust plate 40. Therefore, wear and seizure of the thrust plate 40 caused by the rotation of the crankshaft 11 can be made less likely to occur.

[0034] When an electric motor 10 with a large output is used, the load in the thrust direction acting on the crankshaft 11 increases due to an increase in the weight of the rotor 9 and an increase in the electromagnetic force in the thrust direction. In this embodiment, as described above, wear and seizure of the thrust plate 40 caused by the rotation of the crankshaft 11 can be prevented, so that even if an electric motor with a large output of 15 kW or more is used, wear and seizure of the thrust plate 40 caused by the rotation of the crankshaft 11 can be suppressed. Therefore, it is possible to adopt an electric motor 10 with a large output, and therefore the capacity of the hermetic scroll compressor 1 can be increased.

[0035] Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment differs from the first embodiment in that the thrust plate 40 is made of a steel material rather than a high hardness material, and in that a coating layer 46 having a harder hardness than the thrust plate 40 is provided on the upper surface 40a of the thrust plate 40. The same components as those in the first embodiment are given the same reference numerals, and detailed descriptions thereof will be omitted.

[0036] 4, the coating layer 46 is provided so as to cover the upper surface 40a of the thrust plate 40 from above. That is, in this embodiment, the thrust plate 40 and the crankshaft 11 are in contact with each other via the coating layer 46. The coating layer 46 is formed by applying, for example, a DLC coating process or a ceramic-based coating process to the upper surface 40a of the thrust plate 40. The coating layer 46 may be provided on substantially the entire upper surface 40a of the thrust plate 40, or may be provided only in the region that comes into contact with the crankshaft 11.

[0037] According to this embodiment, the following advantageous effects are obtained. In this embodiment, a coating layer 46 having a harder hardness than the thrust plate 40 is provided on the upper surface 40a of the thrust plate 40. This improves the wear resistance and seizure resistance of the thrust plate 40. This makes it possible to suppress wear and seizure of the thrust plate 40 caused by the rotation of the crankshaft 11. This makes it possible to employ an electric motor 10 with a high output, thereby enabling the capacity of the hermetic scroll compressor 1 to be increased.

[0038] Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS. This embodiment differs from the first embodiment in that a groove 42 is formed in an upper surface 40a of a thrust plate 40. The same components as those in the first embodiment are given the same reference numerals and detailed description thereof will be omitted.

[0039] 5 and 6, a groove 42 is formed in the upper surface 40a of the thrust plate 40 in a region where the lower surface of the crankshaft 11 and the upper surface 40a of the thrust plate 40 face each other. Note that, in the following, a case where the groove 42 is formed only in the thrust plate 40 will be described, but the present invention is not limited to this example. For example, the groove 42 according to the present invention may be formed only in the crankshaft 11 in a region where the lower surface of the crankshaft 11 and the upper surface 40a of the thrust plate 40 face each other, or may be formed in both the crankshaft 11 and the thrust plate 40.

[0040] As shown in Fig. 6, the grooves 42 have a sector shape with a central angle of 60°, and are provided at four locations every 90° in the circumferential direction. As shown in Fig. 5, the grooves 42 are formed so as to be recessed from the upper surface 40a of the thrust plate 40. Lubricating oil 15 is supplied into the grooves 42 from the through holes 41. That is, the grooves 42 communicate with the flow passage 51 formed in the intake pipe 16 and the flow passage 17 formed in the crankshaft 11 at the end (inner peripheral end) of the thrust plate 40 on the through hole 41 side.

[0041] Furthermore, the cross-sectional shape of the groove 42 cut in the circumferential direction may be a step shape as shown in Fig. 7, a tapered shape as shown in Fig. 8, or a dimple shape as shown in Fig. 9. In other words, general shapes used in thrust bearings and the like can be applied to this embodiment as well.

[0042] By forming minute recesses (groove portions 42) in the upper surface 40a of the thrust plate 40, dynamic pressure is generated between the upper surface 40a of the thrust plate 40 and the lower end of the crankshaft 11, causing floating due to oil film pressure. As a result, friction loss generated between the lower end of the crankshaft 11 and the upper surface 40a of the thrust plate 40 can be reduced.

[0043] A radially outer end 42a of the groove 42 is located inside the outer circumferential surface of the crankshaft 11. Therefore, the lubricating oil 15 supplied from the through hole 41 to the groove 42 tends to remain in the groove 42 and is unlikely to leak outward beyond the outer circumferential surface of the crankshaft 11.

[0044] For example, if groove 42 were formed outside the outer circumferential surface of crankshaft 11, unlike this embodiment, lubricating oil 15 would flow out of the circulation system, reducing the amount of lubricating oil 15 supplied to journal bearings, compression mechanism, etc. In contrast, in this embodiment, radial outer end 42a of groove 42 is located inside the outer circumferential surface of crankshaft 11, so sufficient lubricating oil 15 can be supplied to journal bearings, compression mechanism, etc. without reducing the amount of lubricating oil 15.

[0045] According to this embodiment, the following advantageous effects are obtained. In this embodiment, the thrust plate 40 is made of a high-hardness material, and further, a groove 42 is formed on the upper surface 40a of the thrust plate 40, and the lubricating oil 15 is supplied to the groove 42. By supplying the lubricating oil 15 to the groove 42, an oil film is formed between the upper surface 40a of the thrust plate 40 and the crankshaft 11. This can further improve the wear resistance and seizure resistance of the thrust plate 40. Therefore, the wear and seizure of the thrust plate 40 caused by the rotation of the crankshaft 11 can be further suppressed. Therefore, it is possible to adopt an electric motor 10 with a large output, and the capacity of the hermetic scroll compressor 1 can be increased.

[0046] [Fourth embodiment] Next, a fourth embodiment of the present invention will be described. The configuration according to this embodiment differs from the second embodiment in that a groove 42 is formed on an upper surface 40a of a thrust plate 40. That is, the third embodiment includes both the coating layer 46 described in the second embodiment and the groove 42 described in the third embodiment. The same components as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0047] The step of forming the coating layer 46 and the step of forming the grooves 42 may be performed in either order. That is, the coating layer 46 may be provided so as to cover the upper surface 40a of the thrust plate 40, and then the grooves 42 may be formed in the upper surface 40a of the thrust plate 40. In this case, the coating layer 46 is not provided on the inner circumferential surface of the grooves 42. Furthermore, after the grooves 42 are formed in the upper surface 40a of the thrust plate 40, the coating layer 46 may be provided so as to cover the upper surface 40a of the thrust plate 40. In this case, the coating layer 46 is provided on the inner circumferential surface of the grooves 42 (in particular, the bottom surface of the grooves 42).

[0048] According to this embodiment, the following advantageous effects are obtained. In this embodiment, a coating layer 46 is provided on the upper surface 40a of the thrust plate 40, and further, a groove 42 is formed on the upper surface 40a of the thrust plate 40, and lubricating oil 15 is supplied to the groove 42. By supplying the lubricating oil 15 to the groove 42, an oil film is formed between the upper surface 40a of the thrust plate 40 and the crankshaft 11. This can further improve the wear resistance and seizure resistance of the thrust plate 40. Therefore, wear and seizure of the thrust plate 40 caused by the rotation of the crankshaft 11 can be further suppressed. Therefore, it is possible to adopt an electric motor 10 with a large output, and the capacity of the hermetic scroll compressor 1 can be increased.

[0049] Fifth embodiment Next, a fifth embodiment of the present invention will be described. In this embodiment, the materials of the crankshaft 11 and the thrust plate 40 are different from those of the first embodiment. Since the other points are substantially the same as those of the first embodiment, the same components as those of the first embodiment are denoted by the same reference numerals and detailed description thereof will be omitted.

[0050] The crankshaft 11 of this embodiment is entirely made of a magnetic material. The thrust plate 40 is entirely made of a magnetic material. The crankshaft 11 and the thrust plate 40 are formed so that the lower surface of the crankshaft 11 and the upper surface 40a of the thrust plate 40 have the same magnetic polarity. That is, the crankshaft 11 and the thrust plate 40 are arranged so that the same magnetic poles face each other.

[0051] Although an example in which the entire crankshaft 11 is made of a magnetic material has been described, only a part of the crankshaft 11 may be made of a magnetic material. That is, a magnetic material portion made of a magnetic material may be embedded in the crankshaft 11 made of steel. Similarly, a portion of the thrust plate 40 may be made of a magnetic material. That is, a magnetic material portion made of a magnetic material may be embedded in the thrust plate 40 made of steel.

[0052] According to this embodiment, the following advantageous effects are obtained. In this embodiment, the crankshaft 11 and the thrust plate 40 are arranged so that the same magnetic poles face each other. As a result, the crankshaft 11 and the thrust plate 40 repel each other, thereby reducing the load from the crankshaft 11 acting on the upper surface 40a of the thrust plate 40. This makes it possible to further suppress wear and seizure of the thrust plate 40 caused by the rotation of the crankshaft 11. This makes it possible to employ an electric motor 10 with a large output, thereby enabling the capacity of the hermetic scroll compressor 1 to be increased.

[0053] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and scope of the present invention. For example, in each of the above embodiments, the present invention has been described as being applied to a scroll compressor, but the present invention is not limited to this example. For example, the present invention may be applied to a rotary compressor or a reciprocating compressor.

[0054] In addition, in each of the above embodiments, an example has been described in which thrust plate 40 is provided below crankshaft 11, but the present invention is not limited to this example. It is sufficient that thrust plate 40 supports the load in the thrust direction of crankshaft 11 from below, and may be provided, for example, at a midpoint in the longitudinal direction of crankshaft 11. In addition, thrust plate 40 does not have to be plate-shaped and may be, for example, cylindrical. [Explanation of symbols]

[0055] 1: Hermetic scroll compressor 2: Sealed housing 3: Discharge cover 4: Top cover 5: Discharge chamber 6: Upper bearing member 6A: Journal bearing part 6B: Thrust bearing part 7: Scroll compression mechanism 8: Stator 8A: Stator winding 9: Rotor 10: Electric motor 11: Crankshaft 12: Crank pin 13: Lower journal bearing 14: Positive displacement oil pump 15: Lubricating oil 16: Intake pipe 17: Distribution path 18: Fixed scroll 18A: End plate 18B: Spiral wrap 19: Rotating Scroll 19A: End plate 19B: Spiral wrap 19C: Bearing boss 20: Compression chamber 21: Rotation prevention mechanism 22: Drive bush 23: Swing bearing 24:Discharge port 25: Chip seal 26: Chip seal 27: Suction pipe 28: Intake port 29: Discharge valve 30:Discharge piping 40: Thrust plate 40a:Top surface 41:Through hole 42: Groove 42a: Outer end 43: Tapered surface 45: Pump rotor 46: Coating layer 51: Distribution path C: Center axis line

Claims

[Claim 1] an electric motor having a rotor that rotates about a central axis; a crankshaft fixed to the rotor and rotated about the central axis by a driving force from the electric motor; a journal bearing that rotatably supports the crankshaft; a support portion that supports a load acting on the crankshaft in a direction along the central axis by a support surface, A concave groove is formed on the support surface of the support portion, A lubricant is supplied to the groove, a coating layer having a harder layer than the support surface is provided on the entire surface of the support surface of the support part except for the groove portion, A compressor, wherein the output of the electric motor is 15 kW or more.

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