JP7608042B2 - Compressor - Google Patents

Description

The present invention relates to a compressor.

A vertical hermetic compressor contains within its housing a compression mechanism that compresses the refrigerant and a motor (electric motor) that drives the compression mechanism. Also contained within the housing is a crankshaft that connects the compression mechanism to the rotor of the motor, 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. Documents that disclose such a hermetic compressor include Patent Document 1 and Patent Document 2.

Patent document 1 describes a compressor having a thrust plate, which is a plate-shaped member that is 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.

Patent document 2 describes a compressor in which the bottom end of the main shaft and an axle thrust bearing provided on a subframe are in a sliding relationship with each other and constitute a sliding part. In this compressor, the axle 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 axle thrust bearing of the subframe, is coated or treated with a film.

JP 2017-155718 A International Publication No. 2009/154151

In recent years, the capacity of compressors has been increasing. As the capacity of compressors increases, there is a tendency for motors with higher output to be used with the compressors. Such motors with high output have heavy rotors. For this reason, in compressors using motors with high output, the load acting in the thrust direction (direction along the central axis of the crankshaft) on the crankshaft to which the rotor is fixed increases. In addition, when a motor with high 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).

The compressor described in Patent Document 1 has a groove 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 if a motor with high output is used in the compressor described in Patent Document 1, for example, there is a possibility that wear and seizure of the thrust plate will occur.

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 to prevent the halogenated hydrocarbon or the double bond of the hydrocarbon having a carbon double bond in its composition from being decomposed or polymerized in the sliding parts of the scroll compressor with which the refrigerant may come into contact. Thus, Patent Document 2 does not take into consideration wear and seizure of the axial thrust bearing. 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.

The present invention was made in consideration of these circumstances, and aims to provide a compressor that can suppress wear and seizure of the support parts caused by the rotation of the crankshaft.

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 comprises 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.

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-mentioned configuration, the hardness of the support surface is increased to 700 Hv or more in Vickers hardness. 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.

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 the 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.

In the above configuration, the support surface is provided with a coating layer that is harder 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.

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 the 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, the crankshaft having a first magnetic part that is a magnetic material, the support part having a second magnetic part that is a magnetic material, and the first magnetic part and the second magnetic part are arranged so that the same magnetic poles face each other.

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, 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.

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

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.

In addition, in one aspect of the compressor of the present invention, the output of the electric motor may be 15 kW or more.

In the above configuration, the output of the electric motor is 15 kW or more. When an electric motor with high 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 high output is used, wear and seizure of the support part caused by the rotation of the crankshaft can be suppressed. This allows the compressor to have a large capacity.

The present invention makes it possible to suppress wear and seizure of the support parts caused by the rotation of the crankshaft.

1 is a vertical cross-sectional view showing a scroll compressor according to a first embodiment of the present invention. FIG. 2 is a partially enlarged vertical cross-sectional view showing a thrust plate of the scroll compressor of FIG. 1 . 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. FIG. 6 is a partially enlarged vertical cross-sectional view showing a thrust plate of a scroll compressor according to a second embodiment of the present invention. FIG. 11 is a partially enlarged vertical cross-sectional view showing a thrust plate of a scroll compressor according to a third embodiment of the present invention. FIG. 11 is a plan view showing a thrust plate of a scroll compressor according to a third embodiment of the present invention. 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. 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. 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.

First Embodiment
A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3. 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 the 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.

An upper bearing member 6 is fixedly installed in the upper part of the sealed housing 2, and a scroll compression mechanism 7 is installed through the upper bearing member 6, and an electric motor 10 consisting of a stator 8 and a rotor 9 is installed below it.

The electric motor 10 is incorporated into the sealed housing 2 by fixing the stator 8 to the sealed housing 2. The 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 around 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.

The crankshaft 11 is a member extending along the central axis C. The crankshaft 11 is fixed to the rotor 9, and rotates about the central axis C by the driving force from the electric motor 10. A crank pin 12, whose axis is offset by a predetermined dimension, is provided at the upper end of the crankshaft 11, and the scroll compression mechanism 7 can be driven by the electric motor 10 by connecting the crank pin 12 to the scroll compression mechanism 7. The crankshaft 11 has an upper portion rotatably supported by the 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 the lower portion of the sealed housing 2.

A volumetric 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 the lubricating oil 15 filled in the bottom of the sealed housing 2 through a suction pipe 16 and discharge it into a flow passage 17 drilled along the axial direction within the crankshaft 11. This lubricating oil 15 can be supplied through 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 as it approaches the bottom.

The scroll compression mechanism 7 includes an upper bearing member 6 as one of its components, a fixed scroll 18 fixedly installed on the upper bearing member 6, an orbiting scroll 19 slidably supported by the 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 interposed between the upper bearing member 6 and the orbiting scroll 19 to prevent the orbiting scroll 19 from rotating and allow the orbital rotation, and a drive bush 22 and orbiting bearing 23 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 to transmit the rotational force of the crankshaft 11 to the orbiting scroll 19. The fixed scroll 18 is installed on the upper bearing member 6 with the center of the end plate connected to the discharge cover 3.

The fixed scroll 18 comprises an end plate 18A and a spiral wrap 18B erected on the end plate 18A, with a discharge port 24 provided in 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 comprises an end plate 19A and a spiral wrap 19B erected 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.

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

As shown in FIG. 2, the thrust plate (supporting portion) 40 is a plate-shaped member with an upper surface (supporting surface) 40a in contact with 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 made of a high-hardness material. In detail, the thrust plate 40 is made of a material with a Vickers hardness of 700 Hv or more. Specifically, the thrust plate 40 is made of an alloy steel such as chromium steel or chromium molybdenum steel that has been subjected to heat treatment (hardening, nitriding, etc.).

The thrust plate 40 is formed with a through hole 41 through which the lubricating oil 15 flows. The through hole 41 connects a flow passage 51 formed in the suction pipe 16 with a flow passage 17 formed in the crankshaft 11. As a result, as shown in Fig. 3, the lubricating oil 15 that has passed through the suction pipe 16 flows through the through hole 41 of the thrust plate 40, and after the lubricating oil 15 flows through the through hole 41 of the thrust plate 40, the lubricating oil 15 flows through the flow passage 17 of the 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.

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.

In this embodiment, the thrust plate 40 is made of a material with a Vickers hardness of 700 Hv or more. In other words, 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.

When a high-output electric motor 10 is used, the thrust load acting on the crankshaft 11 increases due to the weight of the rotor 9 and the 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 a high-output electric motor with an 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, since it is possible to adopt an electric motor 10 with a high output, the capacity of the hermetic scroll compressor 1 can be increased.

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 steel material instead of 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 denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 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 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 area that comes into contact with the crankshaft 11.

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.

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 denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in Figures 5 and 6, a groove 42 is formed on the upper surface 40a of the thrust plate 40 in the region where the lower surface of the crankshaft 11 and the upper surface 40a of the thrust plate 40 face each other. Note that, below, a case where the groove 42 is formed only on 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 on the crankshaft 11 in the 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 on both the crankshaft 11 and the thrust plate 40.

As shown in FIG. 6, the grooves 42 are sector-shaped 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 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.

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.

By forming minute recesses (groove portions 42) on 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 occurring between the lower end of the crankshaft 11 and the upper surface 40a of the thrust plate 40 can be reduced.

The 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 less likely to leak outward beyond the outer circumferential surface of the crankshaft 11.

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

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.

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 the upper surface 40a of the 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 descriptions thereof will be omitted.

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).

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 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.

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.

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. In other words, the crankshaft 11 and the thrust plate 40 are arranged so that the same magnetic poles face each other.

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.

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.

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 and may also be applied to, for example, a rotary compressor or a reciprocating compressor.

In addition, in each of the above embodiments, an example in which the thrust plate 40 is provided below the crankshaft 11 has been described, but the present invention is not limited to this example. The thrust plate 40 only needs to support the load in the thrust direction of the crankshaft 11 from below, and may be provided, for example, at a midpoint in the longitudinal direction of the crankshaft 11. In addition, the thrust plate 40 does not have to be plate-shaped, and may be, for example, cylindrical.

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

Claims (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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