Compressor

Abstract

To provide a compressor which inhibits a working fluid from being dissolved into a lubrication oil to keep lubricity of a slide part and an amount of the working fluid discharged from a compression mechanism at the high level.SOLUTION: A compressor 1 includes: compression mechanism parts (2, 3, 4) configured to compress a working fluid; electric motor parts (11, 12) configured to drive the compression mechanism parts; a closed vessel 5 which houses the compression mechanism parts and the electric motor parts; a rotary shaft 6 which transmits driving force of the electric motor parts to the compression mechanism parts; and an oil reservoir 17 in which a lubrication oil to be supplied to a slide part is stored at a bottom part of the closed vessel. The working fluid has a liquid density which is smaller than that of the lubrication oil when suctioned into the compressor 1. The compressor includes metal plate components 30, facing surfaces of a coil part forming a stator, provided in an area above the stator of the electric motor parts or an area below the stator of the electric motor parts or in both of the areas.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a compressor having a mechanism for suppressing dissolution of a working fluid into a lubricating oil. [Background technology]

[0002] Conventionally, hydrofluorocarbons (HFCs) have been used as refrigerants in refrigeration and air conditioning equipment such as air conditioners and freezers. HFCs are greenhouse gases with a high global warming potential (GWP) although their ozone depletion potential (ODP) is close to zero. Therefore, from the perspective of preventing global warming, efforts are being made to reduce the amount of HFCs used and emitted, and to switch to natural refrigerants with low GWP.

[0003] When switching refrigerants, it is necessary to ensure the reliability of the compressor incorporated in the refrigerant circuit and the safety of the refrigerant. In order to ensure the reliability of the compressor, it is important to ensure the lubrication of the sliding parts of the compressor. Lubricating oil is sealed in the compressor to lubricate the sliding parts. Some of the lubricating oil is compatible with the refrigerant and circulates through the refrigerant circuit together with the refrigerant. The refrigerant with the lubricating oil dissolved in it is compressed in the compressor incorporated in the refrigerant circuit.

[0004] It is known that when an excessive amount of refrigerant is dissolved in a lubricating oil, the viscosity of the lubricating oil decreases and the lubricating effect is weakened. Therefore, when switching between refrigerants, it is important to maintain the high viscosity of the lubricating oil even when an excessive amount of refrigerant is dissolved in the lubricating oil. It is desirable to prevent a situation in which the refrigerant dissolves in the lubricating oil excessively and a situation in which a large amount of lubricating oil is discharged from the compressor together with the refrigerant.

[0005] Patent Document 1 describes a compressor equipped with an oil agitation suppression element. In this compressor, the oil agitation suppression element suppresses the agitation of the lubricating oil stored at the bottom of the compressor by the rotor of the electric motor. By suppressing the agitation of the lubricating oil, it is possible to prevent situations that deteriorate the lubrication of the sliding parts of the compressor, such as the inclusion of air bubbles in the lubricating oil and the supply of lubricating oil containing air bubbles to the sliding parts.

[0006] Patent Document 2 describes a compressor equipped with an oil heating means for heating lubricating oil. The oil heating means transfers heat generated in a sealed container to the lubricating oil stored at the bottom of the sealed container to heat the lubricating oil. Heating the lubricating oil suppresses the decrease in viscosity of the refrigerant due to liquefaction and the foaming of the refrigerant when the lubricating oil is stirred. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 4-347387 [Patent Document 2] JP 2009-133233 A Summary of the Invention [Problem to be solved by the invention]

[0008] Natural refrigerants with low ODP and GWP include carbon dioxide, ammonia, and hydrocarbons such as propane and isobutane. Hydrocarbon refrigerants such as propane are relatively energy efficient, and are therefore being widely used in refrigeration and air conditioning equipment. However, when using a hydrocarbon refrigerant in a refrigerant circuit, there is a problem in that it is difficult to ensure lubricity of the sliding parts of the compressor.

[0009] Hydrocarbon refrigerants such as propane have high compatibility with lubricating oils, and therefore dissolve in large amounts in lubricating oils compared to conventional refrigerants. When the refrigerant dissolves in the lubricating oil, the viscosity of the lubricating oil decreases, making it difficult for an oil film to form on the sliding parts of the compressor. With the change in refrigerant, the lubricity of the sliding parts of the compressor deteriorates, causing a problem of reduced reliability of the compressor.

[0010] Furthermore, unlike hydrofluoroolefins (HFOs), hydrocarbon refrigerants do not generate lubricating components such as metal halides on the sliding parts of the compressor. When using hydrocarbon refrigerants, the action of the lubricating components derived from the refrigerant cannot be expected, making it more difficult to ensure lubricity of the sliding parts.

[0011] In addition, when a hydrocarbon refrigerant is used in the refrigerant circuit, there is a problem that it is difficult to ensure the amount of refrigerant circulating in the refrigerant circuit. Since the hydrocarbon refrigerant is easily dissolved in the lubricating oil, it is likely to remain inside the compressor, and the amount of refrigerant circulating in the refrigerant circuit decreases. When the amount of refrigerant circulating in the refrigerant circuit decreases, there is a problem that the efficiency of the refrigeration cycle and the refrigeration capacity decrease.

[0012] One method for ensuring the amount of refrigerant circulating through the refrigerant circuit is to increase the amount of refrigerant charged into the refrigerant circuit. However, since hydrocarbon refrigerants such as propane are flammable, the amount of refrigerant charged is limited from the viewpoint of safety. When the working fluid of the compressor is a type that is highly compatible with the lubricating oil, it is desirable to ensure the lubrication of the sliding parts of the compressor and the amount of working fluid circulating through the working fluid circuit by preventing the working fluid from dissolving excessively in the lubricating oil or a large amount of lubricating oil from being discharged from the compressor together with the working fluid.

[0013] In Patent Document 1, the oil agitation suppression element suppresses the intrusion of air bubbles into the lubricating oil and also suppresses the lubricating oil from escaping from the sealed container together with the refrigerant gas. However, the oil agitation suppression element is a disk-shaped element large enough to cover the entire lower end of the rotor, and does not actively separate the refrigerant dissolved in the lubricating oil. When the refrigerant and the lubricating oil are highly compatible with each other, the refrigerant dissolves in the lubricating oil above the liquid level of the lubricating oil, which may lead to poor lubrication of the sliding parts of the compressor and a decrease in the amount of refrigerant circulating in the refrigerant circuit.

[0014] In Patent Document 2, the lubricating oil stored at the bottom of the sealed container is heated by an oil heating means. However, the oil heating means transfers heat generated in the sealed container to the lubricating oil stored at the bottom of the sealed container, and does not act on the lubricating oil scattered as mist inside the sealed container. If the compatibility between the refrigerant and the lubricating oil is high, the refrigerant will also dissolve in the lubricating oil scattered as mist, which may cause poor lubrication of the sliding parts of the compressor and a decrease in the amount of refrigerant circulating in the refrigerant circuit.

[0015] Therefore, an object of the present invention is to provide a compressor that can suppress dissolution of the working fluid into the lubricating oil and maintain high levels of lubrication of the sliding parts and the amount of working fluid discharged from the compression mechanism. [Means for solving the problem]

[0016] In order to solve the above problems, the compressor of the present invention is a compressor comprising: a compression mechanism unit that compresses a working fluid; an electric motor unit that drives the compression mechanism unit; a sealed container that houses the compression mechanism unit and the electric motor unit; a rotating shaft that transmits the driving force of the electric motor unit to the compression mechanism unit; and an oil reservoir that stores lubricating oil at the bottom of the sealed container to be supplied to a sliding unit, wherein the working fluid has a lower liquid density than the lubricating oil when sucked into the compressor, and is provided with a metal plate component that faces the surface of a winding unit that constitutes the stator, above a stator of the electric motor unit, below the stator of the electric motor unit, or both. Effect of the Invention

[0017] According to the present invention, it is possible to provide a compressor that can suppress dissolution of the working fluid into the lubricating oil and maintain high levels of lubrication of the sliding parts and the amount of working fluid discharged from the compression mechanism. [Brief description of the drawings]

[0018] [Figure 1] 1 is a cross-sectional view illustrating an example of a compressor according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view showing an example of a stator that constitutes an electric motor unit. [Diagram 3] 1 is a perspective view showing an example of installation of a metal plate part relative to a winding portion of a stator constituting an electric motor unit; [Figure 4] FIG. 2 is a plan view showing an example of a metal plate part installed inside a compressor. [Diagram 5] FIG. 2 is a perspective view showing an example of a metal plate part installed inside a compressor. [Figure 6] FIG. 2 is a plan view showing an example of a metal plate part installed inside a compressor. [Figure 7] FIG. 2 is a perspective view showing an example of a metal plate part installed inside a compressor. [Figure 8] FIG. 2 is a plan view showing an example of a metal plate part installed inside a compressor. [Figure 9] FIG. 2 is a perspective view showing an example of a metal plate part installed inside a compressor. [Figure 10] 1 is a cross-sectional view illustrating an example of a compressor according to an embodiment of the present invention. [Figure 11] FIG. 4 is a perspective view showing an example of an insulator that constitutes an electric motor unit. [Figure 12] FIG. 4 is a perspective view showing an example of an insulator that constitutes an electric motor unit. [Figure 13] 1 is a perspective view showing an example of assembling a metal plate part to a stator constituting an electric motor unit; [Figure 14] 1 is a perspective view showing an example of installation of a metal plate part relative to a winding portion of a stator constituting an electric motor unit; [Figure 15]1 is a perspective view showing an example of installation of a metal plate part relative to a winding portion of a stator constituting an electric motor unit; [Figure 16] 1 is a perspective view showing an example of installation of a metal plate part relative to a winding portion of a stator constituting an electric motor unit; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] A compressor according to an embodiment of the present invention will be described with reference to the drawings. In the following drawings, the same components are denoted by the same reference numerals, and duplicated descriptions will be omitted.

[0020] Fig. 1 is a cross-sectional view showing an example of a compressor according to an embodiment of the present invention, in which a scroll-type hermetic electric compressor is shown as an example of the compressor. As shown in FIG. 1, the compressor 1 according to this embodiment includes a compression mechanism unit (2, 3, 4) that compresses a working fluid, an electric motor unit (11, 12) that drives the compression mechanism unit, a sealed container 5 that houses the compression mechanism unit and the electric motor unit, a rotating shaft that transmits the driving force of the electric motor unit to the compression mechanism unit, and an oil reservoir that collects lubricating oil at the bottom of the sealed container to be supplied to the sliding parts through the rotating shaft.

[0021] The compression mechanism unit forms a compression mechanism that compresses a working fluid in a compression chamber formed by combining a fixed part and a movable part. The compression mechanism unit is composed of a fixed scroll 2 which is a fixed part, an orbiting scroll 3 which is a movable part, and a frame 4 which supports them. In FIG. 1, the compression mechanism unit is housed in the upper part of the inside of a sealed container 5.

[0022] The frame 4 is disposed at the upper side inside the sealed container 5 and is fixed to the sealed container 5 by welding or the like. The fixed scroll 2 is disposed above the frame 4 and is fixed to the frame 4 by bolts or the like. The orbiting scroll 3 is disposed between the fixed scroll 2 and the frame 4 and is supported by the crankshaft 6 so as to be freely rotatable.

[0023] The fixed scroll 2 includes a disk-shaped base plate 2a and a fixed wrap 2b spirally provided on the base plate 2a. The fixed wrap 2b is erected on the base plate 2a so as to protrude downward from the lower surface of the base plate 2a. An intake hole 2c is formed on the outer side of the scroll of the base plate 2a so as to penetrate the base plate 2a. An exhaust hole 2d is formed on the center side of the scroll of the base plate 2a so as to penetrate the base plate 2a.

[0024] The orbiting scroll 3 includes a disk-shaped base plate 3a and an orbiting wrap 3b spirally provided on the base plate 3a. The orbiting wrap 3b is erected on the base plate 3a so as to protrude upward from the upper surface of the base plate 3a. A cylindrical boss 3c is formed in the center of the lower surface of the base plate 3a so as to protrude downward. An orbiting bearing 3d, which is a sliding bearing, is formed inside the boss 3c.

[0025] The fixed scroll 2 and the orbiting scroll 3 are arranged such that the fixed wrap 2b and the orbiting wrap 3b face each other. The fixed wrap 2b and the orbiting wrap 3b are provided in a spiral shape of substantially the same shape and are meshed with each other. As the fixed wrap 2b and the orbiting wrap 3b mesh with each other, a compression chamber 7 is formed between the lower surface of the base plate 2a of the fixed scroll 2 and the upper surface of the base plate 3a of the orbiting scroll 3.

[0026] The compression chamber 7 is a space for compressing the working fluid. The compression chamber 7 is formed with the base plate 2a of the fixed scroll 2 as the upper surface, the base plate 3a of the orbiting scroll 3 as the lower surface, and the fixed wrap 2b and the orbiting wrap 3b as the side surfaces. When the orbiting scroll 3 orbits relative to the fixed scroll 2, the compression chamber 7 moves from the outside of the scroll formed by the fixed wrap 2b and the orbiting wrap 3b toward the center. The volume of the compression chamber 7 decreases as it moves toward the center of the scroll.

[0027] The crankshaft 6 constitutes a rotating shaft that transmits the driving force of the electric motor to the compression mechanism. An eccentric pin 6a is provided at the upper end of the crankshaft 6. The eccentric pin 6a is eccentric from the main shaft portion of the crankshaft 6 and is fitted into the orbiting bearing 3d of the orbiting scroll 3. An Oldham ring 8 that prevents the orbiting scroll 3 from rotating on its own axis is engaged with the lower surface side of the orbiting scroll 3.

[0028] A shaft hole 4a is formed at the center of the frame 4, penetrating the frame 4 from top to bottom. A main bearing 9, which is a rolling bearing, is fixed to the upper part of the shaft hole 4a. The shaft hole 4a functions as a sliding bearing. The main shaft portion of the crankshaft 6 is rotatably supported by the main bearing 9 and the shaft hole 4a.

[0029] The electric motor unit is composed of an electric motor that drives the compression mechanism unit. The electric motor unit is composed of a stator 11 which is a fixed part, a rotor 12 which is a rotating part, etc. In Fig. 1, the electric motor unit is housed below the compression mechanism unit inside the sealed container 5 and above an oil reservoir 17. The oil reservoir 17 is formed in the bottom part of the sealed container 5.

[0030] The stator 11 is disposed below the frame 4 inside the sealed container 5 and is fixed to the sealed container 5 by shrink fitting or the like. The stator 11 includes a stator core, which is the iron core of the stator, and a winding portion formed by winding a conductor into a coil shape. In Fig. 1, an upper coil end 11a is formed on the upper side of the stator 11 so as to protrude upward. A lower coil end 11b is formed on the lower side of the stator 11 so as to protrude downward.

[0031] In Fig. 1, the stator 11 is configured without insulators above or below the stator core. The insulators are resin-molded insulating parts that are fitted to the stator core to electrically insulate the stator core from the windings. The upper coil end 11a and the lower coil end 11b are not surrounded by insulators and protrude above and below the stator core.

[0032] The rotor 12 is disposed in a rotor hole 11c provided on the central side of the stator 11. The rotor 12 includes a rotor core, which is the iron core of the rotor, and permanent magnets that generate a magnetic field. The permanent magnets are housed in slots in the rotor core. A plurality of slots are provided at predetermined intervals along the circumferential direction of the rotor core. A crankshaft 6 is coupled to the rotor 12. The crankshaft 6 is fixed by press fitting or the like so as to pass through the rotor 12 from top to bottom. The rotor 12 is supported by the crankshaft 6 so as to be freely rotatable.

[0033] A balance weight 15 is attached below the rotor 12. The balance weight 15 is provided, for example, in a columnar shape that has a partially annular shape in a plan view. The balance weight 15 is disposed along the circumferential direction of the rotor 12 so as to be unevenly distributed on one side of the rotor 12. The balance weight 15 can suppress the movement of the center of gravity caused by the orbiting motion of the orbiting scroll 3, thereby reducing the vibration and load caused by the orbiting motion.

[0034] An oil supply pipe 16 is connected to the lower end of the crankshaft 6. An oil sump 17 for storing lubricating oil is formed at the bottom of the sealed container 5. The lower end side of the oil supply pipe 16 protrudes downward beyond the electric motor section and is immersed in the lubricating oil stored in the oil sump 17. An oil supply hole (not shown) is formed inside the crankshaft 6 so as to penetrate the crankshaft 6 from top to bottom. The oil supply hole communicates between the oil supply pipe 16 and the back pressure chamber 18 and the compression chamber 7.

[0035] A back pressure chamber 18 is formed between the orbiting scroll 3 and the frame 4. The back pressure chamber 18 communicates with the suction side compression chamber 7 and the oil supply hole of the crankshaft 6 via a through hole (not shown). The back pressure chamber 18 is at an intermediate pressure between the discharge pressure and the suction pressure of the compressor 1 while the compression mechanism is in operation. Lubricating oil stored in the oil reservoir 17 is pumped into the back pressure chamber 18 and the suction side compression chamber 7 due to the pressure difference. The pressure in the back pressure chamber 17 is increased by the pumping up of the lubricating oil, and a force is obtained that presses the orbiting scroll 3 against the fixed scroll 2.

[0036] The lubricating oil is stored in an oil reservoir 17 at the bottom of the sealed container 5, and is supplied to the compression mechanism and the sliding parts of the bearings through the oil supply pipe 8 and the oil supply hole of the crankshaft 6. The lubricating oil lubricates the sliding parts, seals the gaps between the members, cools the frictional heat generated in the sliding parts, etc. Any type of lubricating oil can be used, such as polyol ester oil (POE), polyvinyl ether oil (PVE), polyalkylene glycol oil, paraffinic mineral oil, naphthenic mineral oil, etc.

[0037] The sealed container 5 houses the compression mechanism and the electric motor, arranged vertically. The sealed container 5 is composed of a deep dish-shaped bottom lid 5a that forms the bottom of the container, a cylindrical outer cylinder 5b that forms the body of the container, and an upper lid 5c that forms the top of the container. The bottom lid 5a and the upper lid 5c are joined to the outer cylinder 5b by welding or the like. The sealed container 5 is provided as a sealed chamber with high airtightness.

[0038] A suction pipe 21 is connected to the upper part of the sealed container 5 so as to penetrate the sealed container 5. The suction pipe 21 is a pipe that draws the working fluid into the sealed container 5. One end of the suction pipe 21 is connected to an external working fluid circuit or the like. The other end of the suction pipe 21 is connected to the suction hole 2c of the fixed scroll 2. The suction pipe 21 communicates with the suction side compression chamber 7 located outside the scroll through the suction hole 2c.

[0039] The inside of the sealed container 5 is divided into an upper space 22 above the compression mechanism, a middle space 23 below the compression mechanism and above the electric motor, and a lower space 24 below the electric motor. The oil reservoir 17 is provided at the bottom of the sealed container 5, below the lower space 24.

[0040] An upper side passage 25 is formed between the outer side surface of the fixed scroll 2 and the inner surface of the sealed container 5, and between the outer side surface of the frame 4 and the inner surface of the sealed container 5, so as to vertically penetrate the fixed scroll 2 and the frame 4. The upper space 22 and the middle space 23 communicate with each other via the upper side passage 25. The upper side passage 25 serves as a passage through which the working fluid discharged from the compression chamber 7 flows.

[0041] A lower-side passage 26 is formed between the outer side surface of the stator 11 and the inner surface of the sealed container 5 so as to vertically penetrate the stator 11. The middle space 23 and the lower space 24 communicate with each other via the lower-side passage 26. The middle space 23 and the lower space 24 also communicate with each other via the gap between the stator 11 and the rotor 12. The lower-side passage 26 and the gap between the stator 11 and the rotor 12 serve as passages through which lubricating oil entrained in the working fluid separates from the working fluid and flows downward.

[0042] A discharge pipe 27 is connected to the side of the sealed container 5 so as to penetrate the sealed container 5. The discharge pipe 27 is a pipe that discharges the working fluid from inside the sealed container 5. One end of the discharge pipe 27 is connected to the middle space 23. The other end of the discharge pipe 27 is connected to an external working fluid circuit or the like. The inside of the sealed container 5 communicates with the external working fluid circuit or the like through the discharge pipe 27.

[0043] The compressor 1 operates as follows. The compression mechanism of the compressor 1 is driven by passing a three-phase AC current through the windings of the stator 11. The three-phase AC current generates a rotating magnetic field in the windings of the stator 11 and the permanent magnets of the rotor 12, driving the rotational motion of the rotor 12 by electromagnetic force. When the rotational motion of the rotor 12 is driven, the crankshaft 6 rotates integrally with the rotor 12. The rotational motion of the crankshaft 6, which is provided with an eccentric pin 6a, drives the orbital motion of the orbiting scroll 3, which is eccentric with respect to the fixed scroll 2.

[0044] As the orbiting scroll 3 orbits, the compression chamber 7 moves from the outside of the scroll communicating with the suction hole 2c to the center of the scroll communicating with the discharge hole 2d. The volume of the compression chamber 7 decreases as it moves from the outside to the center of the scroll. As the orbiting scroll 3 orbits, the movement of the compression chamber 7 on the scroll and the reduction in volume are repeated. During this process, the working fluid flowing into the compression chamber 7 is continuously compressed.

[0045] The working fluid flows from an external working fluid circuit or the like into the suction side compression chamber 7 located outside the scroll through the suction pipe 21 and the suction hole 2c. Then, as the compression chamber 7 moves, the working fluid is compressed to a pressure higher than the suction pressure. Then, the working fluid is discharged from the discharge side compression chamber 7 located toward the center of the scroll through the discharge hole 2d into the upper space 22. Then, the working fluid flows from the upper space 22 through the upper side passage 25 to the middle space 23. Then, the working fluid is discharged from the middle space 23 through the discharge pipe 27 to the external working fluid circuit or the like.

[0046] The lubricating oil is pumped from the oil reservoir 17 to the back pressure chamber 18 and the compression chamber 7 to lubricate the sliding parts such as the compression mechanism, main bearing 9, lower bearing, and slewing bearing 3d. A part of the lubricating oil is compatible with the working fluid and flows inside the sealed container 5 and in the external working fluid circuit. Another part of the lubricating oil scatters in the form of mist inside the sealed container 5, or condenses into droplets and flows down to the bottom side of the sealed container 5. The liquefied lubricating oil returns to the oil reservoir 17 through the lower passage 26 and the gap between the stator 11 and the rotor 12.

[0047] It is generally known that if the working fluid dissolves excessively in the lubricating oil, the lubricating effect of the lubricating oil decreases. If the working fluid dissolves in the lubricating oil, the viscosity of the lubricating oil decreases, making it difficult for an oil film to form on the sliding parts. If the working fluid dissolves excessively in the lubricating oil, the lubrication of the sliding parts deteriorates, making them more susceptible to seizure, wear, and the like. In such cases, the compression mechanism will not operate normally, causing a problem of reduced reliability of the compressor.

[0048] In addition, if the working fluid dissolves excessively in the lubricating oil, the amount of working fluid discharged from the compressor decreases. If the working fluid dissolves excessively in the lubricating oil, the working fluid tends to remain inside the compressor together with the lubricating oil, and is difficult to discharge from the compressor. Since the amount of working fluid discharged to an external working fluid circuit or the like decreases, the compressor no longer functions properly, resulting in a problem of reduced reliability of the compressor.

[0049] These problems become more pronounced when the working fluid is a hydrocarbon. Hydrocarbons are relatively compatible with common hydrocarbon-based lubricating oils, ester-based lubricating oils, ether-based lubricating oils, etc., and therefore tend to dissolve in the lubricating oil filled in the compressor. When the working fluid is a hydrocarbon, the viscosity of the lubricating oil tends to decrease, and the amount of working fluid discharged from the compressor tends to decrease.

[0050] In the refrigerant circuits of refrigeration and air conditioning equipment, when a hydrocarbon refrigerant is used, the lubricity of the sliding parts of the compressor is more likely to deteriorate and the amount of refrigerant circulating in the refrigerant circuit is more likely to decrease than when hydrofluoroolefins (HFOs), hydrofluorocarbons (HFCs), etc. The decrease in the amount of refrigerant circulating in the refrigerant circuit causes problems such as a decrease in the efficiency and refrigeration capacity of the refrigeration cycle.

[0051] In addition, when a hydrocarbon refrigerant is used, lubricating components derived from the refrigerant are not generated on the sliding parts of the compressor. When HFO, HFC, etc. are used, metal halides such as iron fluoride and iron chloride are generated on the sliding parts, etc., so lubrication and wear resistance due to the metal halides may be obtained. However, when the working fluid is a hydrocarbon, lubricating components derived from the refrigerant are not generated, so the lubrication of the sliding parts of the compressor deteriorates and the sliding parts are easily worn.

[0052] In order to prevent the deterioration of the lubrication of the sliding parts of the compressor and the decrease in the amount of working fluid discharged from the compressor, it is effective to prevent the working fluid from dissolving excessively in the lubricating oil and to separate the working fluid dissolved in the lubricating oil from the lubricating oil before it is discharged from the compressor. Since the working fluid and the lubricating oil tend to phase separate more easily as the temperature increases, it is effective to increase the temperature within a range that does not significantly affect the refrigeration cycle.

[0053] Therefore, in the compressor 1 according to this embodiment, from the viewpoint of obtaining the effect of suppressing the working fluid from dissolving in the lubricating oil and the effect of separating the working fluid dissolved in the lubricating oil from the lubricating oil, a metal plate part 30 is provided inside the sealed container 5. As shown in Fig. 1, the metal plate part 30 is disposed so as to face the surface of the winding part constituting the stator 11.

[0054] The metal plate part 30 is made of a metal that is a good conductor. The metal plate part 30 is made of a material that generates electromagnetic induction due to the magnetic field generated by the winding part of the stator 11 and generates Joule heat due to the induced current. The metal plate part 30 is disposed close to the winding part of the stator 11 without directly contacting the winding part of the stator 11 in order to ensure an insulation distance.

[0055] The metal plate part 30 made of such a good conductor can raise the temperature of the lubricating oil and working fluid around the metal plate part 30 by induction heating using electromagnetic induction. The rise in temperature facilitates phase separation between the working fluid and the lubricating oil, and can suppress the working fluid from dissolving in the lubricating oil and can separate the working fluid dissolved in the lubricating oil from the lubricating oil. This can suppress a decrease in the amount of working fluid discharged from the compressor 1 and excessive discharge of the lubricating oil through the discharge pipe 27.

[0056] Moreover, the metal plate part 30 is provided in a structure mainly composed of a plate-shaped part. The metal plate part 30 collects the lubricating oil scattered in a mist state inside the sealed container 5 by colliding it with the plate-shaped part. In Fig. 1, the metal plate part 30 is provided in a cylindrical shape having an inner flange. The metal plate part 30 is arranged so as to surround the upper coil end 11a and the lower coil end 11b of the winding part that constitutes the stator 11.

[0057] According to the metal plate part 30 having such a plate-like portion, the lubricating oil scattering in the form of mist can be collided with the plate-like portion to efficiently liquefy the lubricating oil. The lubricating oil scattering inside the sealed container 5 can be collected, turned into droplets, and returned to the oil reservoir 17, so that it is possible to obtain an effect of suppressing the working fluid from dissolving in the lubricating oil scattering in the form of mist, and an effect of separating the working fluid dissolved in the lubricating oil from the lubricating oil. Therefore, it is possible to suppress a decrease in the amount of working fluid discharged from the compressor 1 and an excessive discharge of the lubricating oil through the discharge pipe 27.

[0058] 1, metal plate components 30 are disposed both above and below the stator 11 inside the compressor 1. An upper metal plate component 30a is disposed above the stator 11. A lower metal plate component 30b is disposed below the stator 11.

[0059] With this arrangement, electromagnetic induction can be generated by the upper and lower coil ends 11a, 11b both above and below the stator 11, so that the temperature of the surrounding lubricating oil and working fluid can be efficiently raised by induction heating. Also, the upper surface and outer side surface of the upper coil end 11a and the lower surface and outer side surface of the lower coil end 11b can be covered with the upper metal plate component 30a and the lower metal plate component 30b, so that lubricating oil that splashes into the middle space 23 and the lower space 24 can be collided and collected.

[0060] However, the metal plate part 30 may be installed above the stator 11, below the stator 11, or both. From the viewpoint of reliably suppressing a decrease in the viscosity of the lubricating oil and a decrease in the amount of working fluid discharged from the compressor 1, it is preferable that the metal plate part 30 is installed at least above the stator 11.

[0061] Furthermore, the metal plate part 30 may be disposed so as to face a portion of the winding part of the stator 11 other than the upper and lower coil ends 11a and 11b. The metal plate part 30 can be disposed so as to face one or more of the upper surface of the winding part constituting the stator 11, the outer peripheral side surface of the coil end of the winding part, the inner peripheral side surface of the coil end of the winding part, and the lower surface of the winding part. By disposing the metal plate part 30 so as not to interfere with the surroundings, it is possible to cause electromagnetic induction due to the magnetic field generated by the winding part and collision with the lubricating oil scattered in a mist form.

[0062] The working fluid compressed by the compressor 1 is preferably a fluid whose liquid density is lower than that of the lubricating oil when it is sucked into the compressor 1. The liquid density when it is sucked into the compressor 1 depends on the pressure and temperature at the time of sucking. If the liquid density of the working fluid is lower than that of the lubricating oil, when the lubricating oil scattered in a mist form is collided with the working fluid and liquefied, the working fluid that is compatible with the lubricating oil is easily separated from the lubricating oil. Therefore, with such a combination of the working fluid and the lubricating oil, the action of the metal plate component 30 becomes more effective.

[0063] The working fluid compressed by the compressor 1 is preferably a hydrocarbon, and more preferably propane, propylene, or isobutane. Hydrocarbons are highly compatible with lubricating oils, and therefore tend to dissolve in large amounts in the lubricating oil. Furthermore, propane, propylene, and isobutane have a lower liquid density when sucked into the compressor 1 than general lubricating oils. Therefore, when these working fluids are used, the action of the metal plate component 30 becomes more effective.

[0064] Fig. 2 is a perspective view showing an example of a stator constituting the electric motor unit of the compressor 1. Fig. 2 shows an example of the configuration of a stator 11 that does not include an insulator constituting the electric motor unit of the compressor 1. As shown in FIG. 2, stator 11 constituting an electric motor section includes a stator core 110 around which a winding section is wound.

[0065] The stator core 110 is a member that forms the iron core of the stator. The stator core 110 is provided with a roughly cylindrical shape. The stator core 110 is formed by laminating a plurality of electromagnetic steel plates in a direction parallel to the central axis. In the stator core 110 shown in FIG. 2, a winding portion is formed by winding a conductor (not shown) in a coil shape.

[0066] The stator core 110 has a back yoke 111 having a roughly cylindrical shape, a plurality of teeth 112 protruding from an inner peripheral end of the back yoke 111 toward the center, and slots 113 which are spaces formed between the teeth 112. In Fig. 2, nine teeth 112 and nine slots 113 are formed in the stator core 110.

[0067] The back yoke 111 constitutes a part of the magnetic circuit together with the windings and the teeth 112. In Fig. 2, the back yoke 111 is provided with a shape having a vertical groove 111a on its outer circumferential surface. The vertical groove 111a is formed by cutting out a part of the outer circumferential surface of the back yoke in a concave shape toward the center.

[0068] The longitudinal grooves 110a extend in a direction parallel to the central axis of the stator 11, and are provided at predetermined intervals from one another along the circumferential direction of the back yoke 111. The longitudinal grooves 110a form a lower-side passage 26 (see FIG. 1) between the outer circumferential surface of the back yoke 111 and the inner surface of the sealed container 5 so as to vertically penetrate the stator 11. When the lubricating oil entrained in the working fluid is separated from the working fluid, it is returned to the oil reservoir 17 through the lower-side passage 26 and the gap between the stator 11 and the rotor 12.

[0069] The teeth 112 are provided so as to protrude from the inner peripheral end of the back yoke 111 toward the center to a position close to the side surface of the rotor 12. The teeth 112 are provided in a columnar shape with a tip end width greater than the base end width in a plan view of the stator core. The teeth 112 are provided at predetermined intervals from each other along the circumferential direction of the back yoke 111.

[0070] The conductor wire forming the winding portion is wound around the teeth 112. The slots 113 provide spaces to accommodate the windings wound around the teeth 112. In the compressor 1, the windings can be wound in an appropriate manner, such as distributed winding or concentrated winding. Distributed winding can reduce torque ripple and iron loss in the motor portion. Concentrated winding can shorten the length of the windings that make up the winding portion, allowing for a high density winding, which is effective in miniaturizing the motor portion and increasing its efficiency. There is also a tendency for the height of the coil ends to be reduced.

[0071] Fig. 3 is a perspective view showing an example of installation of a metal plate part on a winding part of a stator constituting an electric motor part. Fig. 3 shows an example of installation in which a metal plate part 30 is installed on a stator 11 that does not have an insulator. In Fig. 3, dashed lines indicate upper and lower coil ends 11a, 11b of the winding part. A two-dot chain line (shaded area) indicates the metal plate part 30. A part of the stator 11 is shown in perspective through the upper and lower coil ends 11a, 11b and the metal plate part 30.

[0072] As shown in Fig. 3, the metal sheet components 30 can be installed on the upper or lower surface side of the stator core 110 so as to face the surfaces of the coil ends 11a, 11b of the winding portion. The upper metal sheet component 30a can be installed so as to surround the upper coil end 11a from above or laterally. The lower metal sheet component 30b can be installed so as to surround the lower coil end 11b from below or laterally. The metal sheet components 30 can be fixed to the stator core 110, the inner members of the sealed container 5, etc. via insulating components made of resin, ceramics, etc.

[0073] In Fig. 3, the metal sheet component 30 is provided in a cylindrical shape with an inner flange. With this shape, the plate-shaped portion can be brought close to the upper surface and outer side surface of the upper coil end 11a and the lower surface and outer side surface of the lower coil end 11b. Since electromagnetic induction by the upper and lower coil ends 11a and 11b can be caused at each portion, the surrounding lubricating oil and working fluid can be efficiently induction heated. In addition, the lubricating oil scattered in a mist form can be widely collided with the plate-shaped portions forming the upper and lower surfaces and side surfaces.

[0074] However, the metal plate part 30 can be provided in an appropriate shape, such as a flat, curved, bent, hemispherical, or a combination of these, in accordance with the shape of the winding part and the surrounding shape that constitute the stator 11. The metal plate part 30 may have a flat plate-like portion or a curved plate-like portion, as well as portions for joining portions together, reinforcing portions, fixing portions, and the like.

[0075] The metal plate component 30 needs to be installed in a state in which it is electrically insulated from the winding portion constituting the stator 11. As long as the metal plate component 30 does not directly contact the winding portion, it may be installed with a space between it and the winding portion, or an insulating material or insulating component such as insulating paper may be sandwiched between the metal plate component 30 and the winding portion. The metal plate component 30 is installed close to the winding portion while being electrically insulated from the surroundings in order to generate electromagnetic induction by the magnetic field generated by the winding portion of the stator 11.

[0076] The metal plate component 30 is preferably installed so that the shortest distance from the surface of the winding part of the stator 11 is more than 0.25 mm and not more than 20 mm. If the shortest distance from the surface of the winding part is 0.25 mm or less, it is difficult to ensure the spatial distance required for insulation even if the winding part is insulated like an enameled wire. On the other hand, if the distance from the surface of the winding part exceeds 20 mm, electromagnetic induction by the winding part is difficult to occur. In contrast, if the distance is more than 0.25 mm and not more than 20 mm, induction heating by electromagnetic induction can be efficiently used while ensuring the insulation distance. From the viewpoint of ensuring the insulation distance, the shortest distance from the surface of the winding part of the stator 11 is preferably 1 mm or more, more preferably 3 mm or more, and even more preferably 5 mm or more, when the rated voltage is 1 kV or more.

[0077] The metal plate component 30 is preferably formed of a material having a larger iron loss value than the electromagnetic steel sheet forming the stator core 110, which is the iron core constituting the stator 11. The metal plate component 30 is also preferably formed of a material having a larger sheet thickness than the electromagnetic steel sheet forming the stator core 110. Such a material can generate a large amount of heat by electromagnetic induction due to the magnetic field generated by the winding part of the stator 11, so that the temperature of the surrounding lubricating oil and working fluid can be efficiently raised by induction heating.

[0078] Examples of the material of the metal plate part 30 include iron steel, carbon steel, alloy steel, etc. The material of the metal plate part 30 may be any of cold-rolled material and hot-rolled material. Specific examples of the material of the metal plate part 30 include general structural rolled steel material (Steel Structure: SS material), cold-rolled steel plate material (Steel Plate Cold Commercial: SPCC material), hot-rolled steel plate material (Steel Plate Hot Commercial: SPHC material), stainless steel material (Stainless Used Steel: SUS material), etc. In addition, the material of the metal plate part 30 may be an electromagnetic steel plate as long as the electromagnetic steel plate has a larger iron loss value and a larger plate thickness than the electromagnetic steel plate forming the stator core 110.

[0079] Fig. 4 is a plan view showing an example of a metal plate part installed inside a compressor. Fig. 5 is a perspective view showing an example of a metal plate part installed inside a compressor. Figs. 4 and 5 show a metal plate part 30A that is cylindrically formed with an inner flange and has an oil drain hole in the inner flange.

[0080] 4 and 5, the metal plate part 30 can be provided in a cylindrical shape having an inner flange at one end. The metal plate part 30 can be provided in a form (metal plate part 30A) having an oil drain hole as an oil drain structure that allows the lubricating oil separated from the working fluid to flow down from the metal plate part 30.

[0081] The metal sheet part 30A includes a cylindrical body portion 31 and an annular inner flange portion 32. The inner flange portion 32 is provided at only one of both ends in a direction parallel to the central axis of the body portion 31. The inner flange portion 32 protrudes radially inward from the inner surface of the one end in a direction parallel to the central axis of the body portion 31.

[0082] The body portion 31 is formed into a cylindrical shape by a curved plate-like portion. The inner flange portion 32 is formed into an annular shape by a flat plate-like portion. The body portion 31 and the inner flange portion 32 are made of a metal that is a good conductor. The metal sheet part 30A can be installed so as to cover the upper and lower coil ends 11a, 11b of the winding portion of the stator 11 from the outside in the radial direction and the vertical direction.

[0083] With this metal sheet component 30A, the body portion 31 can be made to face the outer side surface of the upper coil end 11a and the outer side surface of the lower coil end 11b. Also, the inner flange portion 32 can be made to face the top surface of the upper coil end 11a and the bottom surface of the lower coil end 11b. Therefore, by utilizing the magnetic fields generated by the upper and lower coil ends 11a, 11b, heat can be generated by electromagnetic induction over a wide range at each location.

[0084] Moreover, with such metal plate part 30A, the paths of the lubricating oil scattering inside the sealed container 5 can be blocked in multiple directions by the body part 31 and the inner flange part 32. The lubricating oil scattering in multiple directions inside the sealed container 5 widely collides with the body part 31 and the inner flange part 32, so that the lubricating oil can be efficiently collected and induction heated.

[0085] 4 and 5, the inner flange portion 32 may be provided with oil drainage holes 33 as an oil drainage structure for draining away lubricating oil accumulated in the plate-like portion. The oil drainage holes 33 are formed near the radial center of the inner flange portion 32 as through-holes that vertically penetrate the inner flange portion 32. The oil drainage holes 33 are formed at equal intervals along the circumferential direction of the inner flange portion 32.

[0086] The oil drain hole 33 is preferably provided with a diameter or inner width of 1 mm or more. For example, the oil drain hole 33 can be provided with a diameter of 1 mm or more that is smaller than the radial width of the inner flange portion 32. If the diameter is 1 mm or more, the lubricating oil, which exhibits viscosity and surface tension, can be stably drained off the surface of the plate-shaped portion.

[0087] 4 and 5, a total of eight oil drain holes 33 are provided in the inner flange portion 32. However, any number of oil drain holes 33 may be provided. The multiple oil drain holes 33 may be arranged in any number of rows and at any intervals along the circumferential or radial direction of the inner flange portion 32. The oil drain holes 33 may be provided in any appropriate shape, such as a circle or a rectangle.

[0088] According to the metal plate part 30A having the oil drain hole 33, the lubricating oil collected in the inner flange portion 32 can be drained below the metal plate part 30A through the oil drain hole 33. The lubricating oil scattered in the form of mist inside the sealed container 5 can be liquefied by colliding with the plate-like portion, and then efficiently returned to the oil reservoir 17. Since the lubricating oil circulates properly inside the compressor 1, it is possible to suppress deterioration of the lubricity of the sliding parts of the compressor 1 and a decrease in the amount of working fluid discharged from the compressor 1 due to excessive dissolution into the lubricating oil.

[0089] In particular, metal plate component 30A having oil drain hole 33 can secure a large area for the plate-like portion, so that electromagnetic induction can be generated over a wide range by utilizing the magnetic field generated by the winding portion of stator 11. Since the surrounding lubricating oil and working fluid can be efficiently induction heated, it is possible to effectively suppress the working fluid from dissolving into the lubricating oil and to separate the working fluid dissolved in the lubricating oil from the lubricating oil.

[0090] Fig. 6 is a plan view showing an example of a metal plate part installed inside a compressor. Fig. 7 is a perspective view showing an example of a metal plate part installed inside a compressor. Figs. 6 and 7 show a metal plate part 30B that is cylindrical with an inner flange and has an oil drain groove on the side.

[0091] 6 and 7, the metal plate part 30 can be provided in a cylindrical shape having an inner flange at one end. The metal plate part 30 can be provided in a form (metal plate part 30B) having a notched oil drain groove as an oil drain structure that allows the lubricating oil separated from the working fluid to flow down from the metal plate part 30.

[0092] The metal plate part 30B includes a body portion 34 having a cylindrical shape with a portion cut out in the circumferential direction, and an inner flange portion 35 having an annular shape with a portion cut out on the outer circumferential side in the circumferential direction. The inner flange portion 35 is provided at only one end of the body portion 34 in a direction parallel to the central axis. The inner flange portion 35 protrudes radially inward from the inner surface of the one end in a direction parallel to the central axis of the body portion 34.

[0093] The body portion 34 is formed in a cylindrical shape with a portion of the circumferential direction cut out by a curved plate-like portion. The inner flange portion 35 is formed in an annular shape with a portion of the outer circumferential direction cut out by a flat plate-like portion. The body portion 34 and the inner flange portion 35 are made of metal, which is a good conductor. The metal plate part 30B can be installed so as to cover the upper and lower coil ends 11a, 11b of the winding portion of the stator 11 from the outside in the radial direction and the vertical direction.

[0094] According to the metal plate part 30B, similarly to the metal plate part 30A, heat generation by electromagnetic induction can be generated over a wide area at each part by utilizing the magnetic fields generated by the upper and lower coil ends 11a, 11b. Also, the lubricating oil that scatters in multiple directions inside the sealed container 5 collides widely against the body part 34 and the inner flange part 35, so that the lubricating oil can be efficiently collected and induction heated.

[0095] 6 and 7, an oil drain groove 36 can be provided in the body portion 34 and the inner flange portion 35 as an oil drainage structure for draining away lubricating oil accumulated in the plate-like portion. The oil drain groove 36 is formed as a through groove that cuts out the outer periphery of the metal plate part 30B and vertically penetrates the outer periphery of the metal plate part 30B.

[0096] The oil drain grooves 36 are formed by cutting out part of the outer circumferential side of the inner flange portion 35 inward, forming openings that vertically penetrate the inner flange portion 35. Also, part of the circumferential direction of the body portion 34 is cut out to form gaps that vertically penetrate the inside and outside of the body portion 34. The oil drain grooves 36 are formed at equal intervals along the circumferential direction of the body portion 34 and the inner flange portion 35.

[0097] The oil drain groove 36 is preferably provided with a width of 1 mm or more. For example, the oil drain groove 36 can be provided with a width of 1 mm or more that is smaller than the radial width of the inner flange portion 35. If the diameter is 1 mm or more, the lubricating oil, which exhibits viscosity or surface tension, can be stably drained off the surface of the plate-shaped portion or can flow through openings or gaps.

[0098] 6 and 7, a total of eight oil drain grooves 36 are provided in the body portion 34 and the inner flange portion 35. However, any number of oil drain grooves 36 may be provided. The multiple oil drain grooves 36 may be disposed at appropriate intervals along the circumferential direction of the body portion 34 or the inner flange portion 35. The oil drain grooves 36 may be provided in any appropriate shape, such as a semicircular shape or a rectangular shape.

[0099] According to the metal plate part 30B having the oil drain groove 36, the lubricating oil collected in the inner flange part 35 can be drained below the metal plate part 30B through the oil drain groove 36. In addition, the working fluid and the lubricating oil can be caused to flow inside and outside the body part 34 through the oil drain groove 36 and collide with the surroundings. The lubricating oil scattered in the form of mist inside the sealed container 5 can be liquefied by colliding with a plate-shaped part, and then efficiently returned to the oil reservoir 17. Since the lubricating oil circulates properly inside the compressor 1, it is possible to suppress deterioration of the lubricity of the sliding parts of the compressor 1 and a decrease in the amount of working fluid discharged from the compressor 1 due to excessive dissolution into the lubricating oil.

[0100] In particular, the metal plate part 30B having the oil drain groove 36 can improve the oil drainage on the side surface. Even when the metal plate part 30B is disposed inside the surrounding members, the oil drain groove 36 ensures an oil drainage path with a through structure between the inner surface of the surrounding members and the outer side surface of the metal plate part 30B. Therefore, the lubricating oil that collides with the inner surface of the surrounding members can be efficiently drained down toward the oil reservoir 17.

[0101] When a vertical groove extending in the up-down direction is formed on the outer side surface of the stator core of the stator 11, the metal sheet component 30B is preferably arranged so that the vertical groove overlaps the oil drain groove 36 in a side view. With such an arrangement, the lubricating oil liquefied by a collision can flow through the oil drain groove 36 into the vertical groove on the outer side surface of the stator core, so that efficient oil drainage can be achieved by utilizing both the oil drain groove 36 and the vertical groove on the outer side surface of the stator core.

[0102] Fig. 8 is a plan view showing an example of a metal plate part installed inside a compressor. Fig. 9 is a perspective view showing an example of a metal plate part installed inside a compressor. Figs. 8 and 9 show a metal plate part 30C having a cylindrical shape and an inclined inner flange.

[0103] 8 and 9, the metal plate part 30 can be provided in a cylindrical shape having an inner flange at one end. The metal plate part 30 can be provided in a form having an inclined inner flange (metal plate part 30C) as an oil drainage structure that allows the lubricating oil separated from the working fluid to flow down from the metal plate part 30.

[0104] The metal plate part 30C includes a cylindrical body 31 and an inclined inner flange 37. The inner flange 37 is provided at only one end of the body 31 in a direction parallel to the central axis. The inner flange 37 protrudes radially inward from the inner surface of the one end in a direction parallel to the central axis of the body 31.

[0105] The body 31 is formed into a cylindrical shape by a curved plate-like portion. The inner flange 37 is formed into an inclined annular shape by a flat plate-like portion. The body 31 and the inner flange 37 are made of a metal that is a good conductor. The metal plate part 30C can be installed so as to cover the upper and lower coil ends 11a, 11b of the winding part of the stator 11 from the outside in the radial direction and the vertical direction.

[0106] According to the metal plate part 30C, similarly to the metal plate part 30A, heat generation by electromagnetic induction can be efficiently generated at each part by utilizing the magnetic fields generated by the upper and lower coil ends 11a, 11b. Also, the lubricating oil scattering in multiple directions inside the sealed container 5 efficiently collides with the body part 31 and the inner flange part 37, so that the lubricating oil can be efficiently collected and induction heated.

[0107] 8 and 9, the inner flange portion 37 can be provided with a slope as an oil drainage structure for draining off lubricating oil accumulated in the plate-like portion. The inner flange portion 37 is provided in a tapered shape that is sloped so that the height decreases from the center side to the outer periphery side of the metal plate part 30C.

[0108] The inclination angle θ of the inner flange portion 37 is not particularly limited and can be set in the range of more than 0 degrees and less than 90 degrees with respect to a horizontal plane perpendicular to the central axis. The inclination angle θ of the inner flange portion 37 is preferably 15 degrees or more, and more preferably 15 degrees or more and 45 degrees or less. When the inclination angle θ is 15 degrees or more, the lubricating oil, which exhibits viscosity and surface tension, can be stably drained off the surface of the plate-shaped portion.

[0109] According to the metal plate part 30C provided with a slope, the lubricating oil collected in the inner flange portion 37 can be made to flow down below the metal plate part 30C due to the slope. The lubricating oil that scatters in the form of a mist inside the sealed container 5 can be liquefied by colliding with the plate-like portion, and then efficiently returned to the oil reservoir 17. Since the lubricating oil circulates properly inside the compressor 1, it is possible to suppress deterioration of the lubricity of the sliding parts of the compressor 1 and a decrease in the amount of working fluid discharged from the compressor 1 due to excessive dissolution into the lubricating oil.

[0110] In particular, the inclined metal plate part 30C can improve the oil drainage on the upper surface side. Whether the metal plate part 30C is arranged facing upward or downward, the lubricating oil adhering to the upper or lower surface of the inclined inner flange part 37 can be efficiently drained off. Therefore, whether the metal plate part 30C is located above or below the stator 11, the lubricating oil that collides with the metal plate part 30C can be efficiently returned to the oil reservoir 17.

[0111] The metal plate part 30A shown in Figures 4 and 5, the metal plate part 30B shown in Figures 6 and 7, and the metal plate part 30C shown in Figures 8 and 9 may be installed above the stator 11, below the stator 11, or both. In one compressor 1, only the metal plate part 30A having the oil drain hole 33 may be installed, only the metal plate part 30B having the oil drain groove 36 may be installed, only the metal plate part 30C having an inclination may be installed, or two or more of them may be installed.

[0112] In addition, the structure of the metal sheet part 30A shown in Fig. 4 and Fig. 5, the structure of the metal sheet part 30B shown in Fig. 6 and Fig. 7, and the structure of the metal sheet part 30C shown in Fig. 8 and Fig. 9 may be appropriately combined and applied. For example, the oil drain hole 33 and the oil drain groove 36 may be provided in the inclined inner flange part 37. The oil drain hole 33 and the oil drain groove 36 may be provided in one metal sheet part. The inner flange part 37 may be provided in an inclined shape so that the height increases from the center side to the outer periphery side of the metal sheet part 30C. From the viewpoint of obtaining high oil drainage efficiency, the inclination as the oil drainage structure is formed is preferably inclined along the radial direction.

[0113] Fig. 10 is a cross-sectional view showing an example of a compressor according to an embodiment of the present invention. Fig. 10 shows, as an example of the compressor, a scroll-type hermetic electric compressor in which an insulator 13 is provided on a stator 11 (compressor 1A). As shown in FIG. 10, a metal plate part 30 used to suppress the penetration of lubricating oil and to separate the working fluid from the lubricating oil can also be installed on a stator 11 equipped with an insulator 13.

[0114] As shown in FIG. 10, similar to the compressor 1 described above, the compressor 1A according to this embodiment includes a compression mechanism unit (2, 3, 4) that compresses a working fluid, an electric motor unit (11, 12) that drives the compression mechanism unit, a sealed container 5 that houses the compression mechanism unit and the electric motor unit, a rotating shaft that transmits the driving force of the electric motor unit to the compression mechanism unit, and an oil reservoir that collects lubricating oil at the bottom of the sealed container to be supplied to the sliding parts through the rotating shaft.

[0115] The compressor 1A according to this embodiment differs from the compressor 1 in that insulators 13 are attached above and below the stator 11. The insulators 13 are resin-molded components that are fitted into the stator core to electrically insulate the stator core from the windings. The metal plate component 30 can be disposed so as to face the surface of the windings of the stator 11 to which the insulators 13 are attached.

[0116] 10, the motor section of compressor 1A includes upper insulator 13a attached to the upper side of stator 11 and lower insulator 13b attached to the lower side of stator 11. An upper metal sheet component 30a is provided above upper insulator 13a. A lower metal sheet component 30b is provided below lower insulator 13b.

[0117] With this arrangement, electromagnetic induction can occur between the upper and lower coil ends 11a, 11b, while the stator core and the windings are electrically insulated by the insulator 13 both above and below the stator 11. In addition, the upper surface of the upper coil end 11a and the lower surface of the lower coil end 11b can be covered with the upper metal plate component 30a and the lower metal plate component 30b, respectively, so that lubricating oil that splashes into the middle space 23 and the lower space 24 can be collided and collected.

[0118] Fig. 11 and Fig. 12 are perspective views showing an example of an insulator constituting the electric motor unit. Fig. 11 shows an example of an upper insulator 13a attached to the upper side of the stator 11. Fig. 12 shows an example of a lower insulator 13b attached to the lower side of the stator 11. As shown in FIGS. 11 and 12, upper insulator 13a and lower insulator 13b are provided in a shape having portions covering back yoke 111 and teeth 112 of stator core 110 (FIG. 2).

[0119] The upper insulator 13a is an insulating component that is fitted to the upper side of the stator core 110 to electrically insulate the stator core 110 from the windings. The upper insulator 13a mainly insulates the upper coil ends 11a from the surroundings. The lower insulator 13b is an insulating component that is fitted to the lower side of the stator core 110 to electrically insulate the stator core 110 from the windings. The lower insulator 13b mainly insulates the lower coil ends 11b from the surroundings.

[0120] The upper and lower insulators 13a and 13b are resin-molded using insulating resin such as polyphenylene sulfide (PPS), liquid crystal polymer (LCP), polyamide (PA), polybutylene terephthalate (PBT), etc. The upper and lower insulators 13a and 13b are fixed to the stator core 110 by, for example, fitting with recesses and protrusions (not shown).

[0121] As shown in Figures 11 and 12, the upper insulator 13a and the lower insulator 13b each have a back yoke insulating portion 131 having a rough annular shape, a plurality of tooth insulating portions 132 protruding from the inner end of the back yoke insulating portion 131 toward the center, a side insulating portion 133 protruding from the outer periphery of the back yoke insulating portion 131 in a direction parallel to the central axis of the insulators 13a, 13b, and a slot 134 which is a space formed between the tooth insulating portions 132.

[0122] Back yoke insulating portion 131 is a portion that is interposed between back yoke 111 and the winding portion to provide electrical insulation between back yoke 111 and the winding portion. Tooth insulating portion 132 is a portion that is interposed between teeth 112 and the winding portion to provide electrical insulation between teeth 112 and the winding portion. Side surface insulating portion 133 is a portion that is interposed between the side surface of the winding portion and the surrounding members of stator core 110 to provide electrical insulation between the winding portion and the surrounding members.

[0123] The conducting wire forming the winding portion is wound around a columnar portion formed by overlapping the teeth 112 and the tooth insulating portion 132. The slot 134 is a space that accommodates the winding wound around the columnar portion. A coil stopper 135 is formed at the tip of the tooth insulating portion 132 so as to protrude in a direction parallel to the central axis of the insulators 13a, 13b. The upper and lower coil ends 11a, 11b are accommodated in the space between the coil stopper 134 and the side insulating portion 133. The side insulating portion 133 has a plurality of slits 136 formed therein for drawing in and drawing out the winding.

[0124] 11 and 12, upper insulator 13a and lower insulator 13b are resin-molded into a predetermined shape, but may be formed into any suitable shape as long as they electrically insulate stator core 110 from the windings. Back yoke insulating portion 131, teeth insulating portion 132, side surface insulating portion 133, etc. may be formed into different shapes or the same shapes between upper insulator 13a and lower insulator 13b.

[0125] The upper insulator 13a and the lower insulator 13b preferably have a shape in which slits 136 for drawing in and drawing out the windings and multiple insertion openings for wedges used in manufacturing an inserter-type motor are provided on the side surface. With such a shape, the slits 136 and the wedge insertion openings can cooperate with the oil drainage structure of the metal sheet part 30. For example, the metal sheet part 30B having the oil drainage groove 36 can be arranged so that the slits 136 and the wedge insertion openings overlap the oil drainage groove 36 in a side view.

[0126] Fig. 13 is a perspective view showing an example of assembling a metal plate part to a stator constituting an electric motor unit. Fig. 13 shows an assembly relationship between parts when a metal plate part 30 is attached to a stator 11 having an insulator 13. 13, the stator 11 can include an insulator 13, which is an insulating component, and insulating paper 14, which is an insulating material. The metal plate component 30 can also be installed inside the insulator 13 with the insulating paper 14 sandwiched therebetween.

[0127] Upper insulator 13a is attached to the upper surface side of stator core 110 so that tooth insulating parts 132 and slots 134 overlap with teeth 112 and slots 113 of stator core 110 in a plan view. Lower insulator 13b is attached to the lower surface side of stator core 110 so that tooth insulating parts 132 and slots 134 overlap with teeth 112 and slots 113 of stator core 110 in a plan view.

[0128] The upper insulator 13a and the lower insulator 13b are fitted into the stator core 110 so that each slot 134 overlaps with the slot 113 of the stator core 110. Insulating paper 14 is inserted into these slots 113, 134. The insulating paper 14 is an insulating material that is inserted into the slots 113 of the stator core 110, which is the iron core that constitutes the stator 11, and electrically insulates the stator core 110 from the winding portion.

[0129] The metal plate component 30 can be provided with an inner diameter larger than the outer diameter of the insulator 13 and installed outside the insulator 13 so as to sandwich the insulator 13 between the winding portion constituting the stator 11. An insulating material such as insulating paper 14 may be sandwiched between the metal plate component 30 and the winding portion constituting the stator 11, but the metal plate component 30 may be installed in a position where no insulating material such as insulating paper 14 is sandwiched. Sandwiching an insulating material such as the insulator 13 or insulating paper 14 can stably insulate the metal plate component 30 from the winding portion. However, if the spatial distance and creepage distance from the winding portion are secured, the metal plate component 30 can be installed in a position where no insulating component or insulating material is sandwiched.

[0130] Fig. 14 is a perspective view showing an example of installation of a metal plate component on the winding section of a stator constituting an electric motor section. Fig. 14 shows an example of installation in which an upper metal plate component 30a is installed on a stator 11 having an insulator 13. In Fig. 14, the dashed line indicates the upper coil end 11a of the winding section. The two-dot chain line (shaded area) indicates the upper metal plate component 30a. A part of the stator 11 is shown in perspective through the upper coil end 11a and the upper metal plate component 30a.

[0131] 14, the upper metal sheet component 30a can be installed so as to face the surface of the upper coil end 11a of the winding portion, outside the upper coil end 11a and outside the side insulating portion 133 of the upper insulator 13a, and cover the upper coil end 11a and the upper insulator 13a from above. The upper metal sheet component 30a can be fixed to the upper insulator 13a via an insulating component made of insulating resin or the like, or a fixing portion provided on the upper insulator 13a. The upper metal sheet component 30a may also be fixed to the inside of the stator core 110 or the sealed container 5 via an insulating component or the like.

[0132] In Fig. 14, the upper metal plate component 30a is installed close to the top surface and outer side surface of the upper coil end 11a without directly contacting the upper coil end 11a. Therefore, the magnetic field generated by the upper coil end 11a causes electromagnetic induction, and the surrounding lubricating oil and working fluid can be heated by induction heating. By facilitating phase separation between the working fluid and the lubricating oil, it is possible to obtain the effect of suppressing the working fluid from dissolving in the lubricating oil and the effect of separating the working fluid dissolved in the lubricating oil from the lubricating oil.

[0133] The upper metal plate part 30a is disposed so as to cover the upper surface of the upper coil end 11a. Therefore, the lubricating oil scattered in the space above the upper coil end 11a can be collided with the plate-shaped part and efficiently liquefied. The lubricating oil scattered inside the sealed container 5 can be collected, and the working fluid can be prevented from dissolving in the lubricating oil, the amount of working fluid discharged from the compressor 1 can be prevented from decreasing, and the lubricating oil can be prevented from being excessively discharged. The upper metal plate part 30a is disposed so as to sandwich the upper insulator 13a between the winding part and the upper metal plate part 30a, so that the insulation against the winding part can be stably secured.

[0134] The upper metal plate component 30a may be installed so as to contact the outer surface of the side insulating portion 133 of the upper insulator 13a, but is preferably installed so as not to contact it. Also, the upper metal plate component 30a is preferably installed so as not to contact the inner surface of the sealed container 5. By ensuring a gap between the upper metal plate component 30a and the side insulating portion 133 or the sealed container 5, efficient oil drainage through the gap becomes possible. Also, since induction heating of the side insulating portion 133 can be suppressed, thermal deterioration of the upper insulator 13a can be suppressed.

[0135] The upper metal plate component 30a may be provided with a height from the horizontal plane on which the tooth insulating portions 132 of the upper insulator 13a extend that is higher than the side insulating portions 133, but is preferably provided with a height lower than the side insulating portions 133. If the height of the upper metal plate component 30a is lower than the side insulating portions 133, when an induced current generated in the upper metal plate component 30a causes a discharge, the upper metal plate component 30a is more likely to be insulated by the side insulating portions 133, thereby improving the reliability of the compressor 1.

[0136] Fig. 15 is a perspective view showing an example of installation of a metal plate part on the winding part of a stator constituting an electric motor part. Fig. 15 shows an example of installation in which a lower metal plate part 30b is installed on a stator 11 having an insulator 13. In Fig. 15, the dashed line indicates the lower coil end 11b of the winding part. The two-dot chain line (shaded area) indicates the lower metal plate part 30b. A part of the stator 11 is shown in perspective through the lower coil end 11b and the lower metal plate part 30b.

[0137] 15, the lower metal sheet component 30b can be installed facing the surface of the lower coil end 11b of the winding portion, outside the lower coil end 11b and outside the side insulating portion 133 of the lower insulator 13b, so as to cover the lower coil end 11b and the lower insulator 13b from below. The lower metal sheet component 30b can be fixed to the lower insulator 13b via an insulating component made of insulating resin or the like, or a fixing portion provided on the lower insulator 13b. The lower metal sheet component 30b may also be fixed to the inside of the stator core 110 or the sealed container 5 via an insulating component or the like.

[0138] In Fig. 15, the lower metal sheet component 30b is installed close to the lower surface and outer side surface of the lower coil end 11b without directly contacting the lower coil end 11b. Therefore, the magnetic field generated by the lower coil end 11b causes electromagnetic induction, and the surrounding lubricating oil and working fluid can be heated by induction heating. This facilitates phase separation between the working fluid and the lubricating oil, and can provide the effect of preventing the working fluid from dissolving in the lubricating oil and the effect of separating the working fluid dissolved in the lubricating oil from the lubricating oil.

[0139] In addition, the lower metal plate component 30b is disposed so as to cover the lower surface of the lower coil end 11b. Therefore, the lubricating oil scattering downward from the lower coil end 11b can be caused to collide with the plate-shaped portion and efficiently liquefied. The lubricating oil scattering inside the sealed container 5 can be collected, and it is possible to suppress dissolution of the working fluid into the lubricating oil, a decrease in the amount of working fluid discharged from the compressor 1, and excessive discharge of the lubricating oil.

[0140] The lower metal plate component 30b may be installed so as to contact the outer surface of the side insulating portion 133 of the lower insulator 13b, but is preferably installed so as not to contact it. Also, the lower metal plate component 30b is preferably installed so as not to contact the inner surface of the sealed container 5. By ensuring a gap between the lower metal plate component 30b and the side insulating portion 133 or the sealed container 5, efficient oil drainage through the gap becomes possible. Also, since induction heating of the side insulating portion 133 can be suppressed, thermal deterioration of the lower insulator 13b can be suppressed.

[0141] The height of the lower metal plate component 30b from the horizontal plane on which the tooth insulating portions 132 of the lower insulator 13b extend may be higher than that of the side insulating portion 133, but is preferably lower than that of the side insulating portion 133. If the height of the lower metal plate component 30b is lower than that of the side insulating portion 133, the lower metal plate component 30b is more likely to be insulated by the side insulating portion 133 when an induced current generated in the lower metal plate component 30b causes a discharge, thereby improving the reliability of the compressor 1.

[0142] Fig. 16 is a perspective view showing an example of installation of a metal sheet part relative to the winding part of a stator constituting an electric motor part. Fig. 16 shows an example of installation in which a metal sheet part 30 is installed so as to face the surface of the winding part of a stator 11 equipped with an insulator cover 28. In Fig. 16, the dashed line (inner shaded area) indicates the upper coil end 11a of the winding part. The two-dot chain line (outer shaded area) indicates the metal sheet part 30. Parts of the stator 11 and the insulator cover 28 are shown in perspective through the metal sheet part 30.

[0143] 16, the stator 11 can include an insulator 13 and an insulator cover 28. The metal plate component 30 can also be installed outside the insulator cover 28 with the insulator 13, which is an insulating component, and the insulator cover 28, which is an insulating component cover, sandwiched between the metal plate component 30 and the winding portion.

[0144] The insulator cover 28 is an insulating component cover that is placed above the insulator 13, which is an insulating component, and covers the winding portion and the insulator 13. The insulator cover 28 has a function of preventing the connections to the winding portion from interfering with surrounding members. The insulator cover 28 is formed in an annular shape and is placed above the upper insulator 13a so as to cover the winding portion and the upper surface side of the upper insulator 13a. The insulator cover 28 is attached, for example, by fitting into the upper insulator 13a.

[0145] The insulator cover 28 is provided with an insertion hole 28a for a lead wire 29 and an oil drain hole 28b that penetrate the insulator cover 28 vertically. The lead wire 29 is inserted into the insertion hole 28a. The lead wire 29 electrically connects the winding section and a power source of the electric motor section. A plurality of oil drain holes 28b are arranged at intervals from each other along the circumferential direction of the insulator cover 28. The oil drain holes 28b are provided to allow lubricating oil that accumulates on the upper surface of the insulator cover 28 to flow down.

[0146] 16, the metal plate part 30 can also be installed on the outside of the insulator cover 28 so as to cover the insulator cover 28. The metal plate part 30 can be fixed to the insulator cover 28, for example, via a fixing portion provided on the insulator cover 28. The metal plate part 30 may be installed on the stator core 110 or fixed to the inside of the sealed container 5 by fitting it onto the outside of the insulator cover 28.

[0147] In Fig. 16, the metal plate component 30 is installed close to the top surface and outer side surface of the upper coil end 11a, sandwiching the insulator cover 28, without directly contacting the upper coil end 11a. Therefore, the magnetic field generated by the upper coil end 11a causes electromagnetic induction, and the surrounding lubricating oil and working fluid can be heated by induction heating. By facilitating phase separation between the working fluid and the lubricating oil, it is possible to obtain the effect of suppressing the working fluid from dissolving in the lubricating oil and the effect of separating the working fluid dissolved in the lubricating oil from the lubricating oil.

[0148] Moreover, the metal plate part 30 is installed so as to cover the upper surface of the insulator cover 28. Therefore, the lubricating oil scattered in the space above the insulator cover 28 can be collided with the plate-shaped part and efficiently liquefied. The lubricating oil scattered inside the sealed container 5 can be collected, and it is possible to suppress dissolution of the working fluid into the lubricating oil, a decrease in the amount of working fluid discharged from the compressor 1, and excessive discharge of the lubricating oil.

[0149] When the metal plate component 30 is installed outside the insulator 13, as shown in FIG. 16, it may have an opening 38 for exposing the neutral terminal block 138 to which the neutral wire of the winding part is connected toward the outside of the metal plate component 30, and a notch 39 for drawing the lead 29 to the outside of the metal plate component 30. The opening 38 can be provided as a through hole penetrating the body part of the metal plate component 30 from the inside to the outside. The notch 39 can be formed by cutting out the inner peripheral end of the inner flange part of the metal plate component 30 toward the outside. Providing the opening 38 or the notch 39 can prevent the metal plate component 30 from interfering with the connection to the winding part. The opening 38 or the notch 39 can also be used for draining oil.

[0150] According to the compressor 1 according to the present embodiment, the metal plate part 30 is disposed so as to face the surface of the winding part constituting the stator 11, so that the surrounding lubricating oil and working fluid can be heated by induction heating, and the working fluid and the lubricating oil can be easily phase-separated. In addition, the lubricating oil scattered in the form of mist can be collided with a plate-shaped part to efficiently liquefy the lubricating oil. Therefore, the induction heating by the metal plate part 30, the liquefaction of the lubricating oil scattered in the form of mist, and the cooperation of these can provide an effect of suppressing the working fluid from dissolving in the lubricating oil, and an effect of separating the working fluid dissolved in the lubricating oil from the lubricating oil. These effects can suppress the decrease in the amount of working fluid discharged from the compressor and the excessive discharge of the lubricating oil through the discharge pipe. Therefore, a highly reliable compressor can be provided that can suppress the dissolution of the working fluid into the lubricating oil and maintain the lubrication of the sliding parts and the amount of working fluid discharged from the compression mechanism at a high level.

[0151] The compressor 1 according to the present embodiment described above is particularly preferably connected to a refrigerant circuit of a refrigeration and air conditioning device for use. The compressor 1 according to the present embodiment can be used to compress the refrigerant circulating in the refrigerant circuit. The compressor 1 according to the present embodiment can be applied to a refrigerant circuit including, for example, a condenser that condenses the refrigerant compressed by the compressor 1, a pressure reducer that reduces the pressure of the refrigerant condensed by the condenser, and an evaporator that evaporates the refrigerant reduced in pressure by the pressure reducer.

[0152] As a refrigeration and air conditioning device to which the compressor 1 according to this embodiment is applied, an air conditioner using a refrigerant mainly composed of a hydrocarbon is preferable. Examples of such refrigerants include R290 (propane), R1270 (propylene), R600 (normal butane), and R600a (isobutane). Examples of air conditioners include room air conditioners, packaged air conditioners, home multi-air conditioners, commercial multi-air conditioners, and building multi-air conditioners.

[0153] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are included as long as they do not deviate from the technical scope. For example, the above-described embodiments are not necessarily limited to those having all the configurations described. It is also possible to replace a part of the configuration of an embodiment with another configuration, or to add another configuration to the configuration of an embodiment. It is also possible to add another configuration to, delete a configuration, or replace a configuration with respect to a part of the configuration of an embodiment.

[0154] For example, the compressor 1 is a scroll compressor, but the type of compressor in which the metal plate parts are installed may be a screw compressor, a rotary compressor, a twin rotary compressor, a two-stage compression rotary compressor, a swing compressor in which rollers and vanes are integrated, or the like, in addition to the scroll compressor.

[0155] Moreover, the metal plate part 30 is disposed outside the insulator 13, but may be disposed inside the insulator 13. The metal plate part 30 is disposed outside the winding part constituting the stator 11 in the radial direction of the stator 11, but may be disposed inside the stator 11 in the radial direction without sandwiching an insulating part between the winding part and the metal plate part 30. When disposing in this way, it is necessary to install it at a position that does not interfere with the crankshaft 6 and the rotor 12, so it can be fixed to the tip side of the teeth of the stator core 110, etc.

[0156] Further, the metal sheet part 30 is provided in a shape in which an inner flange is formed on a cylindrical body, but may be provided in a shape in which an outer flange is formed on a cylindrical body. The outer flange is provided so as to protrude radially outward from the outer surface of one end in a direction parallel to the central axis of the body. The metal sheet part 30 having the outer flange may be disposed on the outer side or the inner side of the winding part constituting the stator 11. [Explanation of symbols]

[0157] 1 Compressor 2 Fixed Scroll 3 Swivel Scroll 4 Frames 5. Airtight containers 6. Crankshaft 7 Compression Chamber 8 Oldham Ring 9 Main bearing 11 Stator 11a Upper coil end 11b Lower coil end 12 Rotor 13 Insulators (insulating parts) 14 Insulating paper (insulating material) 15 Balance weight 16 Fuel Pipe 17 Oil Sump 18 Back pressure chamber 28 Insulator cover (insulating part) 30 Metal plate parts

Claims

1. A compressor including a compression mechanism that compresses a working fluid, an electric motor that drives the compression mechanism, a sealed container that houses the compression mechanism and the electric motor, a rotating shaft that transmits a driving force of the electric motor to the compression mechanism, and an oil reservoir that stores lubricating oil to be supplied to a sliding part at a bottom of the sealed container, The working fluid has a liquid density lower than that of the lubricating oil when suctioned into the compressor, A compressor comprising a metal plate part facing a surface of a winding part constituting the stator, above the stator of the electric motor part, below the stator of the electric motor part, or both.

2. 2. The compressor according to claim 1, The compressor wherein the working fluid is propane, propylene, or isobutane.

3. 2. The compressor according to claim 1, The metal plate part has an oil drainage structure that allows the lubricating oil separated from the working fluid to flow down from the metal plate part, The oil drainage structure is a through hole that passes vertically through the metal plate part, a through groove that passes vertically so as to cut out the outer circumferential side of the metal plate part, or a slope provided in the metal plate part.

4. 2. The compressor according to claim 1, The metal plate part is installed so as to face one or more of the upper surface of the winding portion, the outer circumferential side surface of the coil end of the winding portion, the inner circumferential side surface of the coil end of the winding portion, and the lower surface of the winding portion.

5. 2. The compressor according to claim 1, the stator includes an insulating part that is fitted to an iron core constituting the stator and electrically insulates the iron core from the winding portion, The metal plate component is disposed in a compressor with the insulating component sandwiched between the metal plate component and the winding portion.

6. 2. The compressor according to claim 1, the stator includes an insulating material that is inserted into slots of an iron core that constitutes the stator to electrically insulate the iron core from the winding portion; The metal plate component is installed with the insulating material sandwiched between the metal plate component and the winding portion.

7. 2. The compressor according to claim 1, the stator includes an insulating part that is fitted to an iron core constituting the stator and electrically insulates the iron core from the winding portion, and an insulating part cover that is placed above the insulating part and covers the winding portion and the insulating part, The metal plate component is installed in the compressor with the insulating component cover sandwiched between the metal plate component and the winding portion.

8. A compressor according to any one of claims 1 to 7, The compressor, wherein the metal plate component is installed so that the shortest distance from the surface of the winding portion is greater than 0.25 mm and not greater than 20 mm.

9. A compressor according to any one of claims 1 to 7, The compressor, wherein the metal plate components are formed of a material having a greater iron loss value and plate thickness than the electromagnetic steel sheets of the iron core that constitute the stator.

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