Compressor

Abstract

The invention provides a compressor which can restrain a working fluid from being dissolved in lubricating oil and keep the lubricity of a sliding part and the amount of the working fluid discharged from a compression mechanism at a high level. A compressor (1) is provided with: compression mechanism units (2, 3, 4) that compress a working fluid; motor units (11, 12) for driving the compression mechanism unit; a sealed container (5) which accommodates the compression mechanism part and the motor part; a rotating shaft (6) for transmitting the driving force of the motor unit to the compression mechanism unit; and an oil reservoir (17) in which the lubricating oil supplied to the sliding part is retained at the bottom of the sealed container, and the liquid density of the working fluid when sucked into the compressor (1) is lower than that of the lubricating oil. A metal plate member (30) is provided above the stator of the motor unit, below the stator of the motor unit, or both. The metal plate member (30) faces the surface of the winding unit constituting the stator.

Description

Technical Field

[0001] The present invention relates to a compressor having a mechanism for suppressing working fluid from dissolving into lubricating oil. Background Art

[0002] In the past, hydrofluorocarbons (HFCs) were used as refrigerants for refrigeration and air conditioning equipment such as air conditioners and refrigerators. HFCs are greenhouse gases with an ozone depletion potential (ODP) close to zero but a high global warming potential (GWP). Therefore, from the perspective of preventing global warming, efforts are being made to reduce the use and emission of HFCs and to switch to natural refrigerants with low GWP.

[0003] When switching refrigerants, it is necessary to ensure the reliability of the compressor assembled in the refrigerant circuit, the safety of the refrigerant, etc. In order to ensure the reliability of the compressor, it is important to ensure the lubricity of the sliding parts of the compressor. In the compressor, lubricating oil is sealed to lubricate the sliding parts. A part of the lubricating oil is dissolved in the refrigerant and circulates in the refrigerant circuit together with the refrigerant. In the compressor assembled in the refrigerant circuit, the refrigerant dissolved with the lubricating oil is compressed.

[0004] It is known that if the refrigerant is excessively dissolved, the viscosity of the lubricating oil decreases and the lubricating effect becomes weak. Therefore, when switching the refrigerant, it is important to maintain the lubricating oil at a high viscosity even when the refrigerant is excessively dissolved. It is desirable to prevent the refrigerant from excessively dissolving in the lubricating oil and a large amount of lubricating oil from being 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 lubricating oil retained at the bottom of the compressor is suppressed from being agitated by the rotating parts of the motor by the oil agitation suppression element. By suppressing the agitation of the lubricating oil, the lubricity of the sliding part of the compressor is prevented from being deteriorated, for example, bubbles are prevented from being mixed into the lubricating oil, and the lubricating oil mixed with bubbles is prevented from being supplied to the sliding part.

[0006] Patent Document 2 describes a compressor having an oil heating mechanism for heating lubricating oil. The oil heating mechanism transfers heat generated in a sealed container to the lubricating oil retained at the bottom of the sealed container to heat the lubricating oil. By heating the lubricating oil, a decrease in the viscosity of the refrigerant due to liquefaction and foaming of the refrigerant when the lubricating oil is stirred are suppressed.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Patent Application Laid-Open No. 4-347387

[0010] Patent Document 2: Japanese Patent Application Publication No. 2009-133233 Summary of the invention

[0011] Problems to be solved by the invention

[0012] As natural refrigerants with low ODP and GWP, there are hydrocarbons such as carbon dioxide, ammonia, propane, and isobutane. Hydrocarbon refrigerants such as propane have relatively high energy efficiency, so they are widely used in refrigeration and air-conditioning equipment. However, when hydrocarbon refrigerants are used in the refrigerant circuit, there is a problem that it is difficult to ensure the lubricity of the sliding parts of the compressor.

[0013] Hydrocarbon refrigerants such as propane have high compatibility with lubricating oils, so they are easier to dissolve in lubricating oils in large quantities than conventional refrigerants. When the refrigerant dissolves in the lubricating oil, the viscosity of the lubricating oil decreases, making it difficult to form an oil film on the sliding parts of the compressor. With the change of refrigerant, the lubricity of the sliding parts of the compressor deteriorates, and the reliability of the compressor is reduced.

[0014] In addition, hydrocarbon refrigerants, unlike hydrofluoroolefins (HFO) and the like, do not generate lubricating components such as metal halides in the sliding parts of the compressor. When hydrocarbon refrigerants are used, the effect of the lubricating components of the refrigerant cannot be expected, making it more difficult to ensure lubricity of the sliding parts.

[0015] In addition, when a hydrocarbon refrigerant is used in the refrigerant circuit, it is difficult to ensure the amount of refrigerant circulating in the refrigerant circuit. Hydrocarbon refrigerants are easily dissolved in lubricating oil, so they are easily retained inside the compressor, and the amount of refrigerant circulating in the refrigerant circuit decreases. If the amount of refrigerant circulating in the refrigerant circuit decreases, the refrigeration cycle efficiency and refrigeration capacity will decrease.

[0016] As a method of ensuring the amount of refrigerant circulating in the refrigerant circuit, there is also a method of increasing the amount of refrigerant sealed relative to the refrigerant circuit. However, hydrocarbon refrigerants such as propane are flammable, so from the perspective of safety, the amount of sealing is limited. In the case where the working fluid of the compressor is a type that has high compatibility with the lubricating oil, it is desirable to suppress the situation where the working fluid dissolves excessively in the lubricating oil and the situation where a large amount of lubricating oil is discharged from the compressor together with the working fluid, and to ensure the lubricity of the sliding parts of the compressor and the amount of working fluid circulating in the working fluid circuit.

[0017] In Patent Document 1, an oil agitation suppression element is used to suppress bubbles from mixing into the lubricating oil, and to suppress the lubricating oil from flowing out of the sealed container together with the refrigerant gas. However, the oil agitation suppression element is a disk-shaped element roughly covering the entire surface of the lower end of the rotating part, and does not actively separate the refrigerant dissolved in the lubricating oil. In the case where the refrigerant and the lubricating oil have high compatibility, the refrigerant dissolves into the lubricating oil at a position above the liquid level of the lubricating oil, which may cause poor lubrication of the sliding part of the compressor and a reduction in the amount of refrigerant circulating in the refrigerant circuit.

[0018] In Patent Document 2, the lubricating oil retained at the bottom of the sealed container is heated by an oil heating mechanism. However, the oil heating mechanism transfers the heat generated in the sealed container to the lubricating oil retained at the bottom of the sealed container, and does not represent an effect on the lubricating oil dispersed in the sealed container in the form of mist. In the case where the compatibility between the refrigerant and the lubricating oil is high, the refrigerant also dissolves in the lubricating oil dispersed in the form of mist, which may cause poor lubrication of the sliding part of the compressor and a reduction in the amount of refrigerant circulating in the refrigerant circuit.

[0019] Therefore, an object of the present invention is to provide a compressor capable of suppressing the dissolution of working fluid into lubricating oil and maintaining the lubricity of sliding parts and the amount of working fluid discharged from a compression mechanism at high levels.

[0020] Solutions to Solve Problems

[0021] In order to solve the above-mentioned problem, the compressor of the present invention comprises: a compression mechanism part which compresses a working fluid; a motor part which drives the compression mechanism part; a closed container which accommodates the compression mechanism part and the motor part; a rotating shaft which transmits the driving force of the motor part to the compression mechanism part; and an oil storage part which retains the lubricating oil supplied to the sliding part at the bottom of the closed container, wherein the liquid density of the working fluid when being sucked into the compressor is smaller than that of the lubricating oil, and a metal plate part which is opposite to the surface of the winding part constituting the fixed part is provided above the fixed part of the motor part, below the fixed part of the motor part, or both.

[0022] Effects of the Invention

[0023] According to the present invention, it is possible to provide a compressor capable of suppressing the dissolution of working fluid into lubricating oil and maintaining the lubricity of the sliding portion and the amount of working fluid discharged from the compression mechanism at high levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional view showing an example of a compressor according to an embodiment of the present invention.

[0025] Figure 2It is a perspective view showing an example of a stator constituting the motor part.

[0026] Figure 3 This is a perspective view showing an example of installing sheet metal parts in a winding portion of a stator constituting a motor portion.

[0027] Figure 4 This is a plan view showing an example of a metal plate component provided inside the compressor.

[0028] Figure 5 This is a perspective view showing an example of a metal plate component provided inside the compressor.

[0029] Figure 6 This is a plan view showing an example of a metal plate component provided inside the compressor.

[0030] Figure 7 This is a perspective view showing an example of a metal plate component provided inside the compressor.

[0031] Figure 8 This is a plan view showing an example of a metal plate component provided inside the compressor.

[0032] Fig. 9 This is a perspective view showing an example of a metal plate component provided inside the compressor.

[0033] Fig.10 It is a cross-sectional view showing an example of a compressor according to an embodiment of the present invention.

[0034] Fig.11 It is a perspective view showing an example of an insulator constituting a motor part.

[0035] Fig.12 It is a perspective view showing an example of an insulator constituting a motor part.

[0036] Fig.13 This is a perspective view showing an example of assembling a metal plate component to a stator constituting a motor portion.

[0037] Fig.14 This is a perspective view showing an example of installing sheet metal parts in a winding portion of a stator constituting a motor portion.

[0038] Fig.15 This is a perspective view showing an example of installing sheet metal parts in a winding portion of a stator constituting a motor portion.

[0039] Fig.16 This is a perspective view showing an example of installing sheet metal parts in a winding portion of a stator constituting a motor portion. DETAILED DESCRIPTION

[0040] A compressor according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the following drawings, the same reference numerals are given to common structures, and duplicate descriptions are omitted.

[0041] Figure 1 1 is a cross-sectional view showing an example of a compressor according to an embodiment of the present invention. Figure 1 In the specification, a scroll-type hermetic electric compressor is illustrated as an example of a compressor.

[0042] like Figure 1 As shown, the compressor 1 of this embodiment comprises: compression mechanism parts 2, 3, 4, which compress the working fluid; motor parts 11, 12, which drive the compression mechanism parts; a closed container 5, which accommodates the compression mechanism part and the motor part; a rotating shaft, which transmits the driving force of the motor part to the compression mechanism part; and an oil storage part, which retains the lubricating oil supplied to the sliding part through the rotating shaft at the bottom of the closed container.

[0043] The compression mechanism is a compression mechanism that compresses the working fluid in a compression chamber formed by combining the fixed part and the movable part. The compression mechanism 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 that supports them. Figure 1 In the embodiment, the compression mechanism is accommodated in the upper part of the sealed container 5.

[0044] The frame 4 is arranged on the upper side of the interior of the sealed container 5 and is fixed to the sealed container 5 by welding or the like. The fixed scroll 2 is arranged above the frame 4 and is fixed to the frame 4 by bolts or the like. The orbiting scroll 3 is arranged between the fixed scroll 2 and the frame 4 and is supported by the crankshaft 6 so as to be rotatable.

[0045] The fixed scroll 2 includes a circular plate 2a and a fixed wrap 2b arranged on the plate 2a in a spiral shape. The fixed wrap 2b is arranged upright on the plate 2a in a manner protruding downward from the lower surface of the plate 2a. A suction hole 2c is formed on the outer side of the vortex of the plate 2a in a manner penetrating the plate 2a. A discharge hole 2d is formed on the central side of the vortex of the plate 2a in a manner penetrating the plate 2a.

[0046] The orbiting scroll 3 includes a circular plate 3a and an orbiting lap 3b arranged on the plate 3a in a spiral shape. The orbiting lap 3b is vertically arranged on the plate 3a in a manner protruding upward from the upper surface of the plate 3a. A cylindrical boss 3c is formed in the center of the lower surface side of the plate 3a in a manner protruding downward. A sliding bearing, i.e., an orbiting bearing 3d, is formed on the inner side of the boss 3c.

[0047] The fixed scroll 2 and the orbiting scroll 3 are arranged in a direction in which the fixed wrap 2b and the orbiting wrap 3b are opposite to each other. The fixed wrap 2b and the orbiting wrap 3b are arranged in a spiral shape of substantially the same shape and mesh with each other. The fixed wrap 2b and the orbiting wrap 3b mesh with each other, so that 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.

[0048] 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 outer side of the vortex formed by the fixed wrap 2b and the orbiting wrap 3b to the center side. The volume of the compression chamber 7 decreases as it moves toward the center side of the scroll.

[0049] The crankshaft 6 constitutes a rotating shaft for transmitting the driving force of the motor part to the compression mechanism part. An eccentric pin 6a is provided at the upper end of the crankshaft 6. The eccentric pin 6a is eccentric from the main shaft part of the crankshaft 6 and is embedded in the orbiting bearing 3d of the orbiting scroll 3. A cross ring 8 is engaged with the lower surface side of the orbiting scroll 3 to prevent the orbiting scroll 3 from rotating.

[0050] An axial hole 4a is formed at the center side of the frame 4, which passes through the frame 4 vertically. A rolling bearing, i.e., a main bearing 9, is fixed to the upper part of the axial hole 4a. The axial 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 axial hole 4a.

[0051] The motor part is composed of a motor that drives the compression mechanism part. The motor part is composed of a stator 11, a rotating part, a rotor 12, etc. Figure 1 In the embodiment, the motor part is housed below the compression mechanism part in the sealed container 5 and above the oil reservoir 17. The oil reservoir 17 is formed at the bottom of the sealed container 5.

[0052] The stator 11 is disposed below the frame 4 inside the sealed container 5 and fixed to the sealed container 5 by shrink fitting or the like. The stator 11 includes a stator core, which is an iron core of a fixing member, and a winding portion formed by winding a conducting wire into a coil. Figure 1 In the embodiment, 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.

[0053] exist Figure 1In the embodiment, the stator 11 is configured without insulators on both the upper and lower sides of the stator core. The insulator is an insulating component formed of resin and is engaged with the stator core to electrically insulate the stator core from the winding portion. The upper coil end 11a and the lower coil end 11b are not surrounded by insulators but protrude upward and downward from the stator core.

[0054] The rotor 12 is arranged in a rotor hole 11c provided at the center side of the stator 11. The rotor 12 includes a rotor core, which is an iron core of a rotating member, and a permanent magnet that generates a magnetic field. The permanent magnet is accommodated in a slot of the rotor core. A plurality of slots are provided at predetermined intervals along the circumferential direction of the rotor core. The crankshaft 6 is coupled to the rotor 12. The crankshaft 6 is fixed by press fitting or the like in a manner that the crankshaft 6 passes through the rotor 12 from top to bottom. The rotor 12 is supported by the crankshaft 6 so as to be rotatable.

[0055] A balancing weight 15 is installed below the rotor 12. The balancing weight 15 is provided in a columnar shape that is, for example, partially annular in plan view. The balancing weight 15 is arranged along the circumferential direction of the rotor 12 in a manner biased toward one side relative to the rotor 12. The balancing 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 accompanying the orbiting motion.

[0056] An oil supply pipe 16 is connected to the lower end of the crankshaft 6. An oil reservoir 17 for retaining lubricating oil is formed at the bottom of the sealed container 5. The lower end side of the oil supply pipe 16 protrudes downward from the motor part and is immersed in the lubricating oil retained in the oil reservoir 17. An oil supply hole (not shown) is formed in the crankshaft 6 so as to penetrate the crankshaft 6 from top to bottom. The oil supply hole connects the oil supply pipe 16 with the back pressure chamber 18 and the compression chamber 7.

[0057] A back pressure chamber 18 is formed between the orbiting scroll 3 and the frame 4. The back pressure chamber 18 is connected to the compression chamber 7 on the suction side and the oil supply hole of the crankshaft 6 via a through hole not shown in the figure. The back pressure chamber 18 becomes an intermediate pressure between the discharge pressure and the suction pressure of the compressor 1 during the operation of the compression mechanism. The lubricating oil retained in the oil reservoir 17 is drawn into the back pressure chamber 18 or the compression chamber 7 on the suction side by the pressure difference. The pressure increase of the back pressure chamber 18 caused by the drawing of the lubricating oil obtains a force that presses the orbiting scroll 3 toward the fixed scroll 2.

[0058] The lubricating oil is retained in the oil reservoir 17 at the bottom of the sealed container 5, and is supplied to the compression mechanism and the sliding part of the bearing through the oil supply pipe 8 and the oil supply hole of the crankshaft 6. The lubricating oil lubricates the sliding part, seals the gap between the parts, cools the friction heat generated in the sliding part, etc. As the lubricating oil, any type such as polyol ester oil (POE), polyvinyl ether oil (PVE), polyalkylene glycol oil, paraffin mineral oil, cycloparaffin mineral oil, etc. can be used.

[0059] The sealed container 5 is configured with a compression mechanism and a motor portion arranged above and below and accommodates them. The sealed container 5 is composed of a bottom cover 5a in a deep dish shape forming the bottom of the container, a cylindrical outer cylinder 5b forming the main body of the container, and an upper cover 5c forming the top of the container. The bottom cover 5a, the upper cover 5c and the outer cylinder 5b are joined by welding or the like. The sealed container 5 is provided as a sealed chamber with high airtightness.

[0060] A suction pipe 21 is connected to the upper part of the sealed container 5 in a manner that penetrates the sealed container 5. The suction pipe 21 is a pipe for sucking 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 is connected to the compression chamber 7 on the suction side located outside the scroll through the suction hole 2c.

[0061] The interior 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 motor, and a lower space 24 below the motor. The oil reservoir 17 is provided at the bottom of the sealed container 5 and below the lower space 24.

[0062] An upper side passage 25 is formed between the outer side surface of the fixed scroll 2 and the inner surface of the closed container 5, and between the outer side surface of the frame 4 and the inner surface of the closed container 5, so as to vertically penetrate the fixed scroll 2 and the frame 4. The upper space 22 and the middle space 23 are communicated with each other via the upper side passage 25. The upper side passage 25 serves as a passage for the working fluid discharged from the compression chamber 7 to flow.

[0063] 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 penetrate the stator 11 up and down. The middle space 23 and the lower space 24 are connected to each other via the lower side passage 26. In addition, the middle space 23 and the lower space 24 are connected to each other via the gap between the stator 11 and the rotor 12. The gap between the lower side passage 26 and the stator 11 and the rotor 12 serves as a passage for the lubricating oil accompanying the working fluid to separate from the working fluid and flow down.

[0064] A discharge pipe 27 is connected to the side of the sealed container 5 in a manner that penetrates the sealed container 5. The discharge pipe 27 is a pipe that discharges the working fluid from the inside of 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 is connected to an external working fluid circuit or the like through the discharge pipe 27.

[0065] The operation of the compressor 1 is performed as follows. The compression mechanism of the compressor 1 is driven by supplying three-phase alternating current to the winding portion of the stator 11. By supplying three-phase alternating current, a rotating magnetic field is generated in the winding portion of the stator 11 and the permanent magnet of the rotor 12, and the rotational motion of the rotor 12 based on the electromagnetic force is driven. When the rotational motion of the rotor 12 is driven, the crankshaft 6 rotates integrally with the rotor 12. The rotational motion of the orbiting scroll 3 eccentric to the fixed scroll 2 is driven by the rotational motion of the crankshaft 6 provided with the eccentric pin 6a.

[0066] The compression chamber 7 moves from the outer side of the vortex connected to the suction hole 2c to the center side of the vortex connected to the discharge hole 2d as the vortex 3 rotates. The volume of the compression chamber 7 decreases as it moves from the outer side of the vortex to the center side. As the vortex 3 rotates, the movement and volume reduction of the compression chamber 7 on the vortex are repeated. In this process, the working fluid flowing into the compression chamber 7 is continuously compressed.

[0067] The working fluid flows from the external working fluid circuit, etc., into the compression chamber 7 on the suction side located outside the vortex through the suction pipe 21 and the suction hole 2c. And, as the compression chamber 7 moves, it is compressed to a pressure higher than the suction pressure. After that, it is discharged from the compression chamber 7 on the discharge side located on the center side of the vortex through the discharge hole 2d to the upper space 22. Then, it flows from the upper space 22 to the middle space 23 through the upper side passage 25. Then, it is discharged from the middle space 23 to the external working fluid circuit, etc. through the discharge pipe 27.

[0068] The lubricating oil is drawn 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, the main bearing 9, the lower bearing, and the slewing bearing 3d. A part of the lubricating oil is dissolved in the working fluid and flows in the working fluid circuit inside and outside the closed container 5. Another part of the lubricating oil is dispersed in the form of mist inside the closed container 5, or condensed into droplets and flows down to the bottom side of the closed container 5. The liquefied lubricating oil returns to the oil reservoir 17 through the lower side passage 26 and the gap between the stator 11 and the rotor 12.

[0069] Generally, it is known that if the working fluid dissolves excessively in the lubricating oil, the lubricating effect of the lubricating oil is reduced. If the working fluid dissolves in the lubricating oil, the viscosity of the lubricating oil is reduced, so it is difficult to form an oil film on the sliding part. If the working fluid dissolves excessively in the lubricating oil, the lubricity of the sliding part deteriorates, which easily causes sintering, wear, etc. In such a case, the compression mechanism cannot operate normally and the reliability of the compressor is reduced.

[0070] In addition, if the working fluid dissolves excessively in the lubricating oil, there is a problem that the amount of working fluid discharged from the compressor is reduced. When the working fluid dissolves excessively in the lubricating oil, it is easy to be retained inside the compressor together with the lubricating oil and is difficult to be discharged from the compressor. Since the amount of working fluid discharged to the external working fluid circuit is reduced, the compressor cannot function properly, resulting in a problem of reduced reliability of the compressor.

[0071] These problems become more prominent when the working fluid is hydrocarbon. Hydrocarbons have a relatively high compatibility with general hydrocarbon-based lubricating oils, ester-based lubricating oils, ether-based lubricating oils, etc., and therefore are easily dissolved into the lubricating oil sealed in the compressor. When the working fluid is hydrocarbon, it is easy to cause a decrease in the viscosity of the lubricating oil and a decrease in the amount of working fluid discharged from the compressor.

[0072] Regarding the refrigerant circuit of refrigeration and air conditioning equipment, when a hydrocarbon-based refrigerant is used, the lubricity of the sliding part of the compressor is easily reduced and the amount of refrigerant circulating in the refrigerant circuit is reduced compared to the case of using hydrofluoroolefins (HFO) and hydrofluorocarbons (HFC). Due to the reduction in the amount of refrigerant circulating in the refrigerant circuit, the efficiency of the refrigeration cycle and the refrigeration capacity are reduced.

[0073] In addition, when a hydrocarbon-based refrigerant is used, no lubricating component from the refrigerant is generated in the sliding part of the compressor. When HFO, HFC, etc. are used, since metal halides such as iron fluoride and iron chloride are generated in the sliding part, lubrication and wear resistance due to the metal halides are sometimes obtained. However, when the working fluid is a hydrocarbon, no lubricating component from the refrigerant is generated, so it is easy to cause the lubricity of the sliding part of the compressor to deteriorate and the sliding part to wear.

[0074] In order to suppress the deterioration of the lubricity of the sliding part of the compressor and the reduction of the amount of working fluid discharged from the compressor, it is effective to suppress the excessive dissolution of the working fluid into the lubricating oil and to separate the working fluid dissolved in the lubricating oil from the lubricating oil before being discharged from the compressor. The working fluid and the lubricating oil tend to separate from each other more easily as the temperature increases, so it is effective to increase the temperature within a range that does not significantly affect the refrigeration cycle.

[0075] Therefore, in the compressor 1 of the present embodiment, the metal plate part 30 is provided inside the sealed container 5 from the viewpoint of obtaining the effect of suppressing the working fluid from dissolving into the lubricating oil and the effect of separating the working fluid dissolved in the lubricating oil from the lubricating oil. Figure 1 As shown, the sheet metal component 30 is disposed so as to face the surface of the winding portion constituting the stator 11 .

[0076] The metal plate component 30 is formed of a metal which is a good conductor. The metal plate component 30 is formed of a material which causes electromagnetic induction by the magnetic field generated by the winding part of the stator 11 and generates Joule heat generated by the induced current. In order to ensure the insulation distance, the metal plate component 30 is not in direct contact with the winding part of the stator 11, but is arranged close to the winding part of the stator 11.

[0077] According to the metal plate part 30 formed of such a good conductor, the temperature of the lubricating oil and the working fluid around the metal plate part 30 can be increased by induction heating based on electromagnetic induction. The working fluid and the lubricating oil can be easily separated from each other by the increase in temperature, and the effect of suppressing the working fluid from dissolving into the lubricating oil and the effect of separating the working fluid dissolved in the lubricating oil from the lubricating oil can be obtained. Therefore, the reduction in the amount of working fluid discharged from the compressor 1 and the excessive discharge of the lubricating oil through the discharge pipe 27 can be suppressed.

[0078] The metal plate part 30 is provided with a structure mainly composed of a plate-shaped portion. The metal plate part 30 causes the lubricating oil scattered in the sealed container 5 in a mist to collide with the plate-shaped portion and be captured. Figure 1 In the embodiment, the sheet metal component 30 is provided in a cylindrical shape having an inner flange. The sheet metal component 30 is arranged so as to surround the upper coil end 11 a and the lower coil end 11 b constituting the winding portion of the stator 11 .

[0079] According to the metal plate part 30 having such a plate-shaped portion, the lubricating oil scattered in a mist can be collided with the plate-shaped portion to effectively liquefy the lubricating oil. Since the lubricating oil scattered inside the closed container 5 can be captured and returned to the oil reservoir 17 in the form of droplets, the effect of suppressing the working fluid from dissolving in the lubricating oil scattered in a mist and the effect of separating the working fluid dissolved in the lubricating oil from the lubricating oil can be obtained. Therefore, the reduction in the amount of working fluid discharged from the compressor 1 and the excessive discharge of the lubricating oil through the discharge pipe 27 can be suppressed.

[0080] exist Figure 1 In the embodiment, the sheet metal parts 30 are provided both above and below the stator 11 in the compressor 1. The upper sheet metal part 30a is provided above the stator 11, and the lower sheet metal part 30b is provided below the stator 11.

[0081] With such an arrangement, electromagnetic induction caused by the upper and lower coil ends 11a and 11b can be caused both above and below the stator 11, so that the surrounding lubricating oil and working fluid can be effectively heated by induction heating. In addition, 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 by the upper side metal plate parts 30a and the lower side metal plate parts 30b, so that the lubricating oil scattered into the middle space 23 and the lower space 24 can collide and be captured.

[0082] However, the metal plate part 30 may be disposed 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 the working fluid discharged from the compressor 1, the metal plate part 30 is preferably disposed at least above the stator 11.

[0083] In addition, the metal plate component 30 may be arranged to face a portion other than the upper and lower coil ends 11a and 11b in the winding portion of the stator 11. The metal plate component 30 may be arranged to face any one or more of the upper surface of the winding portion constituting the stator 11, the side surface on the outer peripheral side of the coil end of the winding portion, the side surface on the inner peripheral side of the coil end of the winding portion, and the lower surface of the winding portion. By arranging the metal plate component 30 so as not to interfere with the surroundings, electromagnetic induction caused by the magnetic field generated by the winding portion and collision with the lubricating oil scattered in a mist form can be generated.

[0084] The working fluid compressed by the compressor 1 is preferably a fluid whose liquid density when sucked into the compressor 1 is smaller than that of the lubricating oil. The liquid density when sucked into the compressor 1 depends on the pressure and temperature at the time of suction. If the liquid density of the working fluid is smaller than the liquid density of the lubricating oil, when the lubricating oil scattered in a mist is collided and liquefied, the working fluid that is soluble in the lubricating oil is easily separated from the lubricating oil. Therefore, if it is such a combination of the working fluid and the lubricating oil, the action produced by the metal plate part 30 becomes more effective.

[0085] The working fluid compressed by the compressor 1 is preferably a hydrocarbon, more preferably propane, propylene or isobutane. Hydrocarbons have high compatibility with lubricating oils and are therefore easily dissolved in the lubricating oil in large quantities. In addition, propane, propylene and isobutane have a lower liquid density when sucked into the compressor 1 than ordinary lubricating oils. Therefore, if these working fluids are used, the action produced by the metal plate part 30 becomes more effective.

[0086] Figure 2 It is a perspective view showing an example of a stator constituting the motor part. Figure 2 The structure of the stator 11 without the structure of the insulator constituting the motor part of the compressor 1 is exemplified.

[0087] like Figure 2 As shown, the stator 11 constituting the motor portion includes a stator core 110 around which a winding portion is wound.

[0088] The stator core 110 is a component that forms the core of the stator. The stator core 110 is generally cylindrical in shape. The stator core 110 is formed by stacking a plurality of electromagnetic steel sheets in a direction parallel to the central axis. Figure 2 In the stator core 110 shown, a conducting wire (not shown) is wound in a coil to form a winding portion.

[0089] The stator core 110 includes: a back yoke 111 having a substantially cylindrical shape; a plurality of teeth 112 protruding from the inner peripheral end of the back yoke 111 toward the center; and slots 113 which are spaces formed between the teeth 112. Figure 2 In the embodiment, nine teeth 112 and nine slots 113 are formed on the stator core 110 .

[0090] The back yoke 111, the winding part, the teeth 112, etc. together constitute a part of the magnetic circuit. Figure 2 In the embodiment, the back yoke 111 is provided in a shape having a longitudinal groove 111a on the outer peripheral surface. The longitudinal groove 111a is formed by cutting a part of the outer peripheral surface of the back yoke in a concave shape toward the center in the circumferential direction.

[0091] The longitudinal grooves 110a extend in a direction parallel to the central axis of the stator 11 and are arranged at predetermined intervals along the circumferential direction of the back yoke 111. A lower side passage 26 is formed between the outer peripheral surface of the back yoke 111 and the inner surface of the sealed container 5 so as to penetrate the stator 11 up and down (see Figure 1 When the lubricating oil accompanying the working fluid is separated from the working fluid, it returns to the oil reservoir 17 through the lower side passage 26 and the gap between the stator 11 and the rotor 12 .

[0092] The teeth 112 are arranged so as to protrude from the inner peripheral end of the back yoke 111 toward the center side to a position close to the side surface of the rotor 12. The teeth 112 are arranged in a columnar shape in which the width of the front end portion is larger than the width of the base end side when the stator core is viewed from above. The teeth 112 are arranged at predetermined intervals from each other along the circumferential direction of the back yoke 111.

[0093] The conductive wire forming the winding portion is wound around the teeth 112. The slots 113 serve as spaces for accommodating the winding wound around the teeth 112. In the compressor 1, the winding can be wound in an appropriate winding manner such as distributed winding and concentrated winding. According to the distributed winding, the torque pulsation and iron loss of the motor portion can be reduced. According to the concentrated winding, the length of the winding constituting the winding portion can be shortened, thereby achieving high density of the winding portion, which is effective for miniaturization and high efficiency of the motor portion. In addition, there is a tendency for the height of the coil end to become lower.

[0094] Figure 3 This is a perspective view showing an example of installing sheet metal parts in a winding portion of a stator constituting a motor portion. Figure 3 FIG. 1 shows an example of installing the metal plate component 30 on the stator 11 which does not include an insulator. Figure 3 In FIG. 1 , the dotted lines indicate the upper and lower coil ends 11a and 11b of the winding portion. The two-dot chain lines (hatched areas) indicate the sheet metal parts 30. A portion of the stator 11 is shown in the figure with the upper and lower coil ends 11a and 11b and the sheet metal parts 30 being transparent.

[0095] like Figure 3 As shown, the metal plate parts 30 can be arranged on the upper surface side and the lower surface side of the stator core 110 in a manner opposite to the surface of the coil ends 11a and 11b of the winding part. The upper metal plate parts 30a can be arranged in a manner to surround the upper coil end 11a from the top and the side. In addition, the lower metal plate parts 30b can be arranged in a manner to surround the lower coil end 11b from the bottom and the side. The metal plate parts 30 can be fixed to the stator core 110, the parts inside the closed container 5, etc. via insulating parts made of resin, ceramic, etc.

[0096] exist Figure 3 In the embodiment, the metal plate part 30 is set in a cylindrical shape with an inner flange. With such a shape, the plate-shaped part can be 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 caused by the upper and lower coil ends 11a and 11b is caused in each part, the surrounding lubricating oil and working fluid can be effectively inductively heated. In addition, the lubricating oil scattered in the form of mist can be widely collided with the plate-shaped parts forming the upper and lower surfaces and sides.

[0097] However, the metal plate component 30 can be provided in an appropriate shape such as a plane, a curved surface, a bent shape, a hemispherical shape, or a combination thereof, in accordance with the shape of the winding portion constituting the stator 11 and the shape of the surroundings. The metal plate component 30 may have a portion for joining portions, a portion for reinforcement, a portion for fixing, etc. in addition to the plane plate-shaped portion and the curved plate-shaped portion.

[0098] The metal plate component 30 needs to be provided in a state of being electrically insulated from the winding part constituting the stator 11. As long as the metal plate component 30 is not in direct contact with the winding part, it may be provided with a space between it and the winding part, or it may be provided with an insulating material or insulating component such as insulating paper between it and the winding part. The metal plate component 30 is provided in a state of being electrically insulated from the surroundings and close to the winding part in order to generate electromagnetic induction through the magnetic field generated by the winding part of the stator 11.

[0099] The metal plate part 30 is preferably arranged in a manner that the shortest distance relative to the surface of the winding part of the stator 11 exceeds 0.25 mm and is less than 20 mm. If the shortest distance relative to the surface of the winding part is less than 0.25 mm, it is difficult to ensure the spatial distance required for insulation even when the winding part is insulated like an enameled wire. On the other hand, if the distance relative to the surface of the winding part exceeds 20 mm, it is difficult to cause electromagnetic induction caused by the winding part. In contrast, if it exceeds 0.25 mm and is less than 20 mm, the insulation distance can be ensured and the induction heating caused by electromagnetic induction can be effectively utilized. From the viewpoint of ensuring the insulation distance, when the rated voltage is 1 kV or more, the shortest distance relative to the surface of the winding part of the stator 11 is preferably more than 1 mm, more preferably more than 3 mm, and further preferably more than 5 mm.

[0100] The metal plate component 30 is preferably formed of a material having a larger iron loss value than the electromagnetic steel plate forming the stator core 110 constituting the stator 11. In addition, the metal plate component 30 is preferably formed of a material having a larger plate thickness than the electromagnetic steel plate forming the stator core 110. If such a material is used, a high amount of heat generated by electromagnetic induction can be generated by the magnetic field generated by the winding portion of the stator 11, so that the surrounding lubricating oil and working fluid can be effectively heated by induction heating.

[0101] As the material of the metal plate part 30, steel, carbon steel, alloy steel, etc. can be cited. As the material of the metal plate part 30, any of cold-rolled materials, hot-rolled materials, etc. can be used. Specific examples of the material of the metal plate part 30 include ordinary structural rolled steel (Steel Structure: SS material), cold-rolled steel plate (Steel Plate Cold Commercial: SPCC material), hot-rolled steel plate (Steel Plate Hot Commercial: SPHC material), stainless steel (Stainless Used Steel: SUS material), etc. In addition, as the material of the metal plate part 30, as long as the iron loss value and the plate thickness are larger than those of the electromagnetic steel plate forming the stator core 110, an electromagnetic steel plate can also be used.

[0102] Figure 4 This is a plan view showing an example of a metal plate component provided inside the compressor. Figure 5 This is a perspective view showing an example of a metal plate component provided inside the compressor. Figure 4 as well as Figure 5 A sheet metal part 30A is shown which is provided in a cylindrical shape with an inner flange and has an oil drain hole in the inner flange.

[0103] like Figure 4 as well as Figure 5As shown, the sheet metal part 30 may be provided in a cylindrical shape having an inner flange at one end. The sheet metal part 30 may be provided in a form (sheet metal part 30A) having an oil drain hole as an oil drain structure for allowing lubricating oil separated from the working fluid to flow down from the sheet metal part 30 .

[0104] The sheet metal component 30A includes a cylindrical main body 31 and an annular inner flange 32. The inner flange 32 is provided only at one of the two ends of the main body 31 in a direction parallel to the central axis. The inner flange 32 protrudes radially inward from the inner surface of one end of the main body 31 in a direction parallel to the central axis.

[0105] The main body 31 is formed into a cylindrical shape by a curved plate-shaped portion. The inner flange portion 32 is formed into a circular ring shape by a flat plate-shaped portion. The main body 31 and the inner flange portion 32 are formed of a good conductor, that is, metal. The metal plate component 30A can be provided in a manner that covers 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.

[0106] According to such a metal plate component 30A, the main body 31 can be placed opposite to the outer side surface of the upper coil end 11a and the outer side surface of the lower coil end 11b. In addition, the inner flange 32 can be placed opposite to the upper surface of the upper coil end 11a and the lower surface of the lower coil end 11b. Therefore, the magnetic field generated by the upper and lower coil ends 11a and 11b can be used to generate heat caused by electromagnetic induction in a wide range of various parts.

[0107] In addition, according to such a metal plate part 30A, the path of the lubricating oil scattered inside the closed container 5 can be blocked in multiple directions by the main body 31 and the inner flange 32. The lubricating oil scattered in multiple directions inside the closed container 5 collides with the main body 31 and the inner flange 32 in a wide range, so the lubricating oil can be effectively captured and induction heated.

[0108] like Figure 4 as well as Figure 5 As shown, an oil drain hole 33 can be provided in the inner flange portion 32 as an oil drain structure for allowing the lubricating oil retained in the plate-shaped portion to flow down. The oil drain hole 33 is formed as a through hole that penetrates the inner flange portion 32 vertically near the radial center of the inner flange portion 32. The oil drain holes 33 are formed at equal intervals along the circumferential direction of the inner flange portion 32.

[0109] The oil drain hole 33 is preferably set to a diameter and inner width of 1 mm or more. The oil drain hole 33 can be set to a diameter of, for example, 1 mm or more and smaller than the radial width of the inner flange portion 32. When the diameter is 1 mm or more, the lubricating oil showing viscosity and surface tension can be stably flowed down from the surface of the plate-shaped portion.

[0110] exist Figure 4 as well as Figure 5 In the embodiment, a total of eight drain holes 33 are provided in the inner flange portion 32. However, the number of drain holes 33 can be set appropriately. The plurality of drain holes 33 can be arranged in an appropriate number of rows and at appropriate intervals along the circumferential direction and radial direction of the inner flange portion 32. The drain holes 33 can be set in an appropriate shape such as a circle or a rectangle.

[0111] According to the metal plate component 30A having the oil drain hole 33, the lubricating oil collected by the inner flange portion 32 can flow down to the lower side of the metal plate component 30A through the oil drain hole 33. The lubricating oil scattered in the form of mist inside the sealed container 5 can collide with the plate-shaped portion and liquefy, and then be effectively returned to the oil reservoir 17. The lubricating oil circulates appropriately inside the compressor 1, so that the lubricity of the sliding part of the compressor 1 is deteriorated and the amount of the working fluid discharged from the compressor 1 due to excessive dissolution of the lubricating oil can be suppressed.

[0112] In particular, the metal plate component 30A having the oil drain hole 33 can ensure a large area of ​​the plate-shaped portion, so that electromagnetic induction using the magnetic field generated by the winding portion of the stator 11 can be generated in a wide range. Since the surrounding lubricating oil and working fluid can be effectively inductively heated, the effect of suppressing the working fluid from dissolving into the lubricating oil and the effect of separating the working fluid dissolved in the lubricating oil from the lubricating oil can be effectively obtained.

[0113] Figure 6 This is a plan view showing an example of a metal plate component provided inside the compressor. Figure 7 This is a perspective view showing an example of a metal plate component provided inside the compressor. Figure 6 as well as Figure 7 A sheet metal part 30B is shown which is provided in a cylindrical shape with an inner flange and has an oil drainage groove on the side.

[0114] like Figure 6 as well as Figure 7 As shown, the sheet metal part 30 may be provided in a cylindrical shape having an inner flange at one end. The sheet metal part 30 may be provided in a form having a notched oil drain groove as an oil drain structure for allowing the lubricating oil separated from the working fluid to flow down from the sheet metal part 30 (sheet metal part 30B).

[0115] The sheet metal component 30B includes a main body 34 having a cylindrical shape with a portion of the circumference cut away, and an inner flange 35 having a circular ring shape with a portion of the outer circumference cut away. The inner flange 35 is provided only at one of the two ends of the main body 34 in a direction parallel to the central axis. The inner flange 35 protrudes radially inward from the inner surface of one end of the main body 34 in a direction parallel to the central axis.

[0116] The main body 34 is formed into a cylindrical shape with a portion of the circumference cut away by a curved plate-like portion. The inner flange portion 35 is formed into a circular ring shape with a portion of the circumference cut away by a flat plate-like portion. The main body 34 and the inner flange portion 35 are formed of a good conductor, that is, metal. The metal plate component 30B can be provided in a manner that covers 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 up-down direction.

[0117] According to such a metal plate component 30B, similarly to the metal plate component 30A, it is possible to generate heat by electromagnetic induction in various parts in a wide range by utilizing the magnetic field generated by the upper and lower coil ends 11a and 11b. In addition, the lubricating oil scattered in multiple directions inside the sealed container 5 collides with the main body 34 and the inner flange 35 in a wide range, so that the lubricating oil can be effectively captured and induction heated.

[0118] like Figure 6 as well as Figure 7 As shown, the main body 34 and the inner flange 35 can be provided with an oil drain groove 36 as an oil drain structure for draining the lubricating oil accumulated in the plate-shaped portion. The oil drain groove 36 is formed as a through groove that cuts the outer peripheral side of the metal plate part 30B and penetrates the outer peripheral side of the metal plate part 30B vertically.

[0119] The oil drain groove 36 is formed by cutting away the outer circumference of a portion of the inner flange portion 35 toward the inside to form an opening that vertically penetrates the inner flange portion 35. In addition, a portion of the circumference of the main body portion 34 is cut away to form a gap that penetrates the inside and outside of the main body portion 34 and extends in the vertical direction of the main body portion 34. The oil drain grooves 36 are formed at equal intervals along the circumference of the main body portion 34 and the inner flange portion 35.

[0120] The oil drain groove 36 is preferably set to a lateral width of 1 mm or more. The oil drain groove 36 can be set to a lateral width of, for example, 1 mm or more and smaller than the radial width of the inner flange portion 35. When the diameter is 1 mm or more, the lubricating oil showing viscosity and surface tension can be stably flowed down from the surface of the plate-shaped part or flowed through the openings and gaps.

[0121] exist Figure 6 as well as Figure 7 In the embodiment, a total of eight oil drain grooves 36 are provided in the main body 34 and the inner flange 35. However, the number of oil drain grooves 36 can be appropriately provided. The plurality of oil drain grooves 36 can be arranged at appropriate intervals along the circumference of the main body 34 and the inner flange 35. The oil drain grooves 36 can be provided in appropriate shapes such as a semicircular shape or a rectangular shape.

[0122] According to the metal plate part 30B having the oil drain groove 36, the lubricating oil captured by the inner flange part 35 can flow down to the bottom of the metal plate part 30B through the oil drain groove 36. In addition, the working fluid and the lubricating oil can flow to the inside and outside of the main body part 34 through the oil drain groove 36 and collide with the surroundings. The lubricating oil that is scattered in the form of mist inside the closed container 5 can collide with the plate-shaped part and liquefy, and then effectively return to the oil reservoir 17. In the compressor 1, the lubricating oil circulates appropriately, so that the lubricity of the sliding part of the compressor 1 deteriorates and the amount of the working fluid discharged from the compressor 1 due to excessive dissolution of the lubricating oil can be suppressed.

[0123] In particular, the oil drainage performance of the side surface can be improved according to the metal plate component 30B having the oil drainage groove 36. Even when the metal plate component 30B is arranged inside the surrounding components, an oil drainage path of a through structure formed by the oil drainage groove 36 is ensured between the inner surface of the surrounding components and the outer side surface of the metal plate component 30B. Therefore, the lubricating oil that collides with the inner surface of the surrounding components can be effectively flowed down toward the oil reservoir 17.

[0124] When the outer side surface of the stator core of the stator 11 is formed with a vertical groove extending in the up-down direction, the metal plate component 30B is preferably arranged so that the vertical groove overlaps with the oil drain groove 36 when viewed from the side. With such an arrangement, the lubricating oil liquefied by the collision can flow through the oil drain groove 36 to the vertical groove on the outer side surface of the stator core, so that the oil can be effectively drained by using both the oil drain groove 36 and the vertical groove on the outer side surface of the stator core.

[0125] Figure 8 This is a plan view showing an example of a metal plate component provided inside the compressor. Fig. 9 This is a perspective view showing an example of a metal plate component provided inside the compressor. Figure 8 as well as Fig. 9 A sheet metal part 30C is shown which is provided in the shape of a cylinder with an inclined inner flange.

[0126] like Figure 8 as well as Fig. 9 As shown, the sheet metal part 30 may be provided in a cylindrical shape having an inner flange at one end. The sheet metal part 30 may be provided in a form having an inclined inner flange as an oil drain structure for allowing lubricating oil separated from the working fluid to flow down from the sheet metal part 30 (sheet metal part 30C).

[0127] The sheet metal component 30C includes a cylindrical main body 31 and an inclined inner flange 37. The inner flange 37 is provided only at one of the two ends of the main body 31 in a direction parallel to the central axis. The inner flange 37 protrudes radially inward from the inner surface of one end of the main body 31 in a direction parallel to the central axis.

[0128] The main body 31 is formed into a cylindrical shape by a curved plate-like portion. The inner flange portion 37 is formed into an inclined annular shape by a flat plate-like portion. The main body 31 and the inner flange portion 37 are formed of a good conductor, that is, metal. The metal plate component 30C can be provided in a manner 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.

[0129] According to such a metal plate component 30C, similarly to the metal plate component 30A, the magnetic field generated by the upper and lower coil ends 11a and 11b can be used to effectively cause heating by electromagnetic induction at various locations. In addition, the lubricating oil scattered in multiple directions inside the sealed container 5 effectively collides with the main body 31 and the inner flange 37, so that the lubricating oil can be effectively captured and induction heated.

[0130] like Figure 8 as well as Fig. 9 As shown, the inner flange portion 37 can be provided with an inclination as an oil drain structure to make the lubricating oil accumulated in the plate-shaped portion flow down. The inner flange portion 37 is provided in a tapered inclination shape so that the height decreases from the center side toward the outer peripheral side of the metal plate component 30C.

[0131] The inclination angle θ of the inner flange portion 37 is not particularly limited, and can be set in a range of more than 0 degrees and less than 90 degrees relative to the 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 showing viscosity and surface tension can be stably flowed down from the surface of the plate-shaped portion.

[0132] According to the inclined metal plate part 30C, the lubricating oil captured by the inner flange part 37 can flow down to the bottom of the metal plate part 30C due to the inclination. The lubricating oil scattered in the sealed container 5 in the form of mist can collide with the plate-shaped part and liquefy, and then effectively return to the oil reservoir 17. The lubricating oil circulates appropriately inside the compressor 1, so that the lubricity of the sliding part of the compressor 1 is reduced, and the amount of working fluid discharged from the compressor 1 due to excessive dissolution of the lubricating oil can be suppressed.

[0133] In particular, the oil discharge performance on the upper surface side can be improved by providing the inclined metal plate component 30C. In the case where the metal plate component 30C is arranged upward or downward, the lubricating oil adhering to the upper surface or the lower surface of the inclined inner flange portion 37 can be effectively flowed down. Therefore, at any position above or below the stator 11, the lubricating oil that collides with the metal plate component 30C can be effectively returned to the oil reservoir 17.

[0134] Figure 4 as well as Figure 5 The sheet metal part 30A shown, Figure 6 as well as Figure 7 The sheet metal part 30B shown, Figure 8 as well as Fig. 9 The metal plate part 30C shown may be provided 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 provided, only the metal plate part 30B having the oil drain groove 36 may be provided, only the metal plate part 30C having the inclination may be provided, or two or more thereof may be provided.

[0135] in addition, Figure 4 as well as Figure 5 The structure of the sheet metal part 30A shown, Figure 6 as well as Figure 7 The structure of the sheet metal part 30B shown, Figure 8 as well as Fig. 9 The structure of the metal plate part 30C shown can also be combined and applied appropriately. For example, the oil drain hole 33 and the oil drain groove 36 can also be provided in the inclined inner flange part 37. The oil drain hole 33 and the oil drain groove 36 can also be provided in one metal plate part. The inner flange part 37 can also be provided in a shape inclined in a manner that the height increases from the central side of the metal plate part 30C toward the outer peripheral side. From the viewpoint of obtaining high oil drain efficiency, the oil drain structure, i.e., the inclination, is preferably an inclination along the radial direction.

[0136] Fig.10 1 is a cross-sectional view showing an example of a compressor according to an embodiment of the present invention. Fig.10 In the embodiment, as an example of a compressor, a scroll-type sealed electric compressor is illustrated in which an insulator 13 is provided on a stator 11 (compressor 1A).

[0137] like Fig.10 As shown, the metal plate component 30 for suppressing the infiltration of the lubricating oil and the separation of the working fluid from the lubricating oil can also be provided in the stator 11 including the insulator 13 .

[0138] like Fig.10 As shown, the compressor 1A of this embodiment is the same as the compressor 1, and comprises: a compression mechanism part (2, 3, 4), which compresses the working fluid; a motor part (11, 12), which drives the compression mechanism part; a closed container 5, which accommodates the compression mechanism part and the motor part; a rotating shaft, which transmits the driving force of the motor part to the compression mechanism part; and an oil storage part, which retains the lubricating oil supplied to the sliding part through the rotating shaft at the bottom of the closed container.

[0139] The compressor 1A of this embodiment is different from the compressor 1 in that insulators 13 are mounted above and below the stator 11. The insulator 13 is a resin-molded component that is fitted into the stator core to electrically insulate the stator core from the winding portion. The metal plate component 30 can be arranged so as to face the surface of the winding portion of the stator 11 to which the insulator 13 is mounted.

[0140] exist Fig.10 In the embodiment, the motor part of the compressor 1A includes an upper insulator 13a mounted on the upper side of the stator 11 and a lower insulator 13b mounted on the lower side of the stator 11. An upper metal plate fitting 30a is provided above the upper insulator 13a. A lower metal plate fitting 30b is provided below the lower insulator 13b.

[0141] With such an arrangement, the stator core and the winding portion can be electrically insulated by the insulator 13 at both the upper and lower sides of the stator 11, and electromagnetic induction can be caused by the upper and lower coil ends 11a and 11b. In addition, the upper surface of the upper coil end 11a and the lower surface of the lower coil end 11b can be covered by the upper metal plate part 30a and the lower metal plate part 30b, so that the lubricating oil scattered into the middle space 23 and the lower space 24 can collide and be captured.

[0142] Fig.11 as well as Fig.12 It is a perspective view showing an example of an insulator constituting a motor part. Fig.11 An example of the upper insulator 13 a attached to the upper side of the stator 11 is shown. Fig.12 An example of the lower insulator 13 b attached to the lower side of the stator 11 is shown.

[0143] like Fig.11 as well as Fig.12 As shown, the upper insulator 13a and the lower insulator 13b are arranged to cover the stator core 110 ( Figure 2 )'s back yoke 111 and teeth 112.

[0144] The upper insulator 13a is an insulating component that is embedded in the upper side of the stator core 110 and electrically insulates the stator core 110 from the winding part. The upper insulator 13a mainly insulates the upper coil end 11a from the surroundings. The lower insulator 13b is an insulating component that is embedded in the lower side of the stator core 110 and electrically insulates the stator core 110 from the winding part. The lower insulator 13b mainly insulates the lower coil end 11b from the surroundings.

[0145] The upper and lower insulators 13a and 13b are made of 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 fitting, for example, with recesses and projections (not shown).

[0146] like Fig.11 as well as Fig.12 As shown, the upper insulator 13a and the lower insulator 13b respectively include: a back yoke insulation portion 131, which is roughly in the shape of a circular ring; a plurality of tooth insulation portions 132, which protrude from the inner peripheral end of the back yoke insulation portion 131 toward the center side; a side insulation portion 133, which protrudes from the outer peripheral side of the back yoke insulation portion 131 toward a direction parallel to the center axis of the insulators 13a and 13b; and a groove 134, which is a space formed between the tooth insulation portions 132.

[0147] The back yoke insulating portion 131 is a portion between the back yoke 111 and the winding portion to electrically insulate the back yoke 111 and the winding portion. The tooth insulating portion 132 is a portion between the teeth 112 and the winding portion to electrically insulate the teeth 112 and the winding portion. The side insulating portion 133 is a portion between the side surface of the winding portion and the surrounding components of the stator core 110 to electrically insulate the winding portion and the surrounding components.

[0148] The conducting wire forming the winding part is wound around the columnar part formed by overlapping the teeth 112 and the tooth insulating part 132. The groove 134 is a space for storing the winding wound around the columnar part. A coil stopper 135 is formed at the front end of the tooth insulating part 132 so as to protrude in a direction parallel to the central axis of the insulators 13a and 13b. The upper and lower coil ends 11a and 11b are stored in the space between the coil stopper 135 and the side insulating part 133. A plurality of slits 136 for introducing and pulling out the winding are formed in the side insulating part 133.

[0149] exist Fig.11 as well as Fig.12 In the embodiment, the upper insulator 13a and the lower insulator 13b are resin-molded into a predetermined shape, but can be set to an appropriate shape as long as the stator core 110 and the winding part are electrically insulated. The back yoke insulation part 131, the tooth insulation part 132, the side insulation part 133, etc. can be set to different shapes between the upper insulator 13a and the lower insulator 13b, or can be set to the same shape.

[0150] The upper insulator 13a and the lower insulator 13b are preferably provided with a plurality of slits 136 for introducing or pulling out the windings and a wedge insertion opening used when manufacturing an inserter-type motor on the side. With such a shape, the slits 136 and the wedge insertion opening can cooperate with the oil drainage structure formed by the metal plate part 30. For example, the metal plate part 30B having the oil drainage groove 36 can be arranged so that the slits 136, the wedge insertion opening and the oil drainage groove 36 overlap in a side view.

[0151] Fig.13 This is a perspective view showing an example of assembling a metal plate component to a stator constituting a motor portion. Fig.13 The assembly relationship between the components when the metal plate component 30 is mounted on the stator 11 including the insulator 13 is shown.

[0152] like Fig.13 As shown in FIG. 1 , the stator 11 may include an insulator 13 as an insulating component and an insulating paper 14 as an insulating material. The metal plate component 30 may be provided inside the insulator 13 via the insulating paper 14 .

[0153] The upper insulator 13a is mounted on the upper surface side of the stator core 110 in a manner that the tooth insulating portion 132 and the slot 134 overlap with the teeth 112 and the slot 113 of the stator core 110 in a plan view. The lower insulator 13b is mounted on the lower surface side of the stator core 110 in a manner that the tooth insulating portion 132 and the slot 134 overlap with the teeth 112 and the slot 113 of the stator core 110 in a plan view.

[0154] The upper insulator 13a and the lower insulator 13b are embedded in the stator core 110 so that the slots 134 overlap the slots 113 of the stator core 110. Insulation paper 14 is inserted into these slots 113 and 134. The insulation paper 14 is an insulating material that is inserted into the slots 113 of the stator core 110, which is the core of the stator 11, and electrically insulates the stator core 110 from the winding portion.

[0155] The metal plate part 30 is provided with an inner diameter larger than the outer diameter of the insulator 13, and can be provided outside the insulator 13 in such a manner that the insulator 13 is sandwiched between the metal plate part 30 and the winding part constituting the stator 11. The metal plate part 30 can sandwich an insulating material such as insulating paper 14 between the metal plate part 30 and the winding part constituting the stator 11, but can also be provided at a position where the insulating material such as insulating paper 14 is not sandwiched. If the insulating material such as the insulator 13 and insulating paper 14 is sandwiched, the metal plate part 30 and the winding part can be electrically insulated stably. However, while ensuring the spatial distance and the surface distance relative to the winding part, the metal plate part 30 can be provided at a position where the insulating parts and insulating materials are not sandwiched.

[0156] Fig.14This is a perspective view showing an example of installing sheet metal parts in a winding portion of a stator constituting a motor portion. Fig.14 FIG. 1 shows an example of installing the upper metal plate component 30a on the stator 11 having the insulator 13. Fig.14 In FIG. 1 , the dotted line indicates the upper coil end 11a of the winding portion. The two-dot chain line (hatched area) indicates the upper sheet metal component 30a. A portion of the stator 11 is shown in the figure with the upper coil end 11a and the upper sheet metal component 30a being transparent.

[0157] like Fig.14 As shown, the upper metal plate part 30a can be arranged on the outside of the upper coil end 11a and the outside of the side insulating portion 133 of the upper insulator 13a in a manner opposite to the surface of the upper coil end 11a of the winding part, so as to cover the upper coil end 11a and the upper insulator 13a from above. The upper metal plate part 30a can be fixed to the upper insulator 13a via an insulating part formed of an insulating resin or the like and arranged at a fixing portion of the upper insulator 13a. In addition, it can also be fixed to the stator core 110 and the inner side of the sealed container 5 via an insulating part or the like.

[0158] exist Fig.14 In the embodiment, the upper metal plate part 30a is not in direct contact with the upper coil end 11a, but is arranged close to the upper surface and the outer side surface of 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. The working fluid and the lubricating oil are easily separated from each other, and the working fluid can be inhibited from dissolving into the lubricating oil and the working fluid dissolved in the lubricating oil can be separated from the lubricating oil.

[0159] In addition, the upper metal plate part 30a is arranged in a manner covering the upper surface of the upper coil end 11a. Therefore, the lubricating oil scattered to the space above the upper coil end 11a can collide with the plate-shaped part and effectively liquefy the lubricating oil. The lubricating oil scattered inside the closed container 5 is captured, which can prevent the working fluid from dissolving into the lubricating oil, reducing the amount of working fluid discharged from the compressor 1, and excessively discharging the lubricating oil. In addition, the upper metal plate part 30a is arranged with the upper insulator 13a sandwiched between the winding part, so that the insulation relative to the winding part can be stably ensured.

[0160] The upper metal plate part 30a may be provided in contact with the outer side surface of the side insulating portion 133 of the upper insulator 13a, but is preferably provided in a non-contacting manner. In addition, the upper metal plate part 30a is preferably provided in a non-contacting manner with the inner surface of the closed container 5. If a gap is ensured between the upper metal plate part 30a and the side insulating portion 133 or the closed container 5, effective oil discharge through the gap can be achieved. In addition, induction heating of the side insulating portion 133 can be suppressed, so that thermal aging of the upper insulator 13a can be suppressed.

[0161] The height of the upper metal plate part 30a from the horizontal plane where the tooth insulating part 132 of the upper insulator 13a extends may be set higher than the side insulating part 133, but is preferably set lower than the side insulating part 133. If the height of the upper metal plate part 30a is lower than the side insulating part 133, when the induced current generated in the upper metal plate part 30a is discharged, it is easy to be insulated by the side insulating part 133, so the reliability of the compressor 1 can be improved.

[0162] Fig.15 This is a perspective view showing an example of installing sheet metal parts in a winding portion of a stator constituting a motor portion. Fig.15 FIG. 1 shows an example of installing the lower metal plate component 30b on the stator 11 having the insulator 13. Fig.15 In FIG. 1 , the dotted line indicates the lower coil end 11b of the winding portion. The two-dot chain line (hatched area) indicates the lower sheet metal component 30b. A part of the stator 11 is shown in the figure with the lower coil end 11b and the lower sheet metal component 30b being transparent.

[0163] like Fig.15 As shown, the lower metal plate part 30b can be arranged on the outside of the lower coil end 11b and the outside of the side insulating portion 133 of the lower insulator 13b in a manner opposite to the surface of the lower coil end 11b of the winding part, and can be arranged in a manner covering the lower coil end 11b and the lower insulator 13b from below. The lower metal plate part 30b can be fixed to the lower insulator 13b via an insulating part formed of an insulating resin or the like and arranged at a fixing portion of the lower insulator 13b. Alternatively, it can be fixed to the stator core 110 or the inner side of the sealed container 5 via an insulating part or the like.

[0164] exist Fig.15 In the embodiment, the lower metal plate part 30b is not in direct contact with the lower coil end 11b, but is arranged close to the lower surface and the outer side surface of 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. The working fluid and the lubricating oil are easily separated from each other, and the working fluid can be inhibited from dissolving into the lubricating oil and the working fluid dissolved in the lubricating oil can be separated from the lubricating oil.

[0165] In addition, the lower metal plate part 30b is provided in a manner covering the lower surface of the lower coil end 11b. Therefore, the lubricating oil scattered toward the lower side of the lower coil end 11b can collide with the plate-shaped part and effectively liquefy the lubricating oil. The lubricating oil scattered inside the sealed container 5 is captured, and it is possible to suppress the working fluid from dissolving into the lubricating oil, reducing the amount of working fluid discharged from the compressor 1, and excessively discharging the lubricating oil.

[0166] The lower metal plate part 30b may be provided in contact with the outer side surface of the side insulating portion 133 of the lower insulator 13b, but is preferably provided in a non-contacting manner. In addition, the lower metal plate part 30b is preferably provided in a non-contacting manner with the inner surface of the closed container 5. If a gap is ensured between the lower metal plate part 30b and the side insulating portion 133 or the closed container 5, effective oil discharge through the gap can be achieved. In addition, induction heating of the side insulating portion 133 can be suppressed, so that thermal aging of the lower insulator 13b can be suppressed.

[0167] The height of the lower metal plate part 30b from the horizontal plane extending from the tooth insulating part 132 of the lower insulator 13b may be set higher than the side insulating part 133, but is preferably set lower than the side insulating part 133. If the height of the lower metal plate part 30b is lower than the side insulating part 133, when the induced current generated by the lower metal plate part 30b is discharged, it is easy to be insulated by the side insulating part 133, so that the reliability of the compressor 1 can be improved.

[0168] Fig.16 This is a perspective view showing an example of installing sheet metal parts in a winding portion of a stator constituting a motor portion. Fig.16 The following is an example of a metal plate component 30 being provided so as to face the surface of the winding portion of the stator 11 provided with the insulator cover 28. Fig.16 In FIG. 1 , the dotted line (the inner shaded area) indicates the upper coil end 11a of the winding portion. The two-dot chain line (the outer shaded area) indicates the sheet metal component 30. The stator 11 and a part of the insulator cover 28 are shown in the figure with the sheet metal component 30 being seen through.

[0169] like Fig.16 As shown, the stator 11 can include the insulator 13 and the insulator cover 28. The metal plate component 30 can also be provided outside the insulator cover 28 with the insulator 13 as an insulating component and the insulator cover 28 as an insulating component cover sandwiched between the metal plate component 30 and the winding portion.

[0170] The insulator cover 28 is an insulating component cover that is provided 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 wiring of the winding portion from interfering with surrounding components. The insulator cover 28 is formed in an annular shape and is arranged 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 mounted by, for example, fitting with respect to the upper insulator 13a.

[0171] The insulator cover 28 is provided with an insertion hole 28a for a lead wire 29 and an oil drain hole 28b so as to penetrate the insulator cover 28 vertically. The lead wire 29 is inserted through the insertion hole 28a. The lead wire 29 electrically connects the winding part and the power supply of the motor part. A plurality of oil drain holes 28b are arranged at intervals along the circumferential direction of the insulator cover 28. The oil drain hole 28b is provided to allow the lubricating oil accumulated on the upper surface of the insulator cover 28 to flow down.

[0172] like Fig.16 As shown, the metal plate part 30 can also be provided on the outside of the insulator cover 28 in a manner covering 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 can also be provided on the stator core 110 by being embedded in the outside of the insulator cover 28, or fixed to the inside of the closed container 5.

[0173] exist Fig.16 In the embodiment, the metal plate part 30 is not in direct contact with the upper coil end 11a, but is arranged close to the upper surface and the outer side surface of the upper coil end 11a through the insulator cover 28. 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. The working fluid and the lubricating oil are easily separated from each other, and the effect of suppressing the working fluid from dissolving into the lubricating oil and the effect of separating the working fluid dissolved in the lubricating oil from the lubricating oil can be obtained.

[0174] In addition, the metal plate part 30 is provided 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 collide with the plate-shaped portion, and the lubricating oil can be effectively liquefied. The lubricating oil scattered inside the sealed container 5 is captured, and it is possible to suppress the working fluid from dissolving into the lubricating oil, the amount of the working fluid discharged from the compressor 1 from decreasing, and the lubricating oil from being discharged excessively.

[0175] When the metal plate part 30 is arranged outside the insulator 13, Fig.16As shown in the figure, an opening 38 for exposing the neutral point terminal block 138 to which the neutral line of the winding part is connected to the outside of the metal plate part 30 and a notch 39 for leading the lead wire 29 to the outside of the metal plate part 30 may also be provided. The opening 38 can be set as a through hole that penetrates the main body of the metal plate part 30 inside and outside. The notch 39 can be formed in a manner that the inner peripheral end of the inner flange part of the metal plate part 30 is cut out toward the outside. If the opening 38 and the notch 39 are provided, it is possible to prevent the metal plate part 30 from interfering with the wiring relative to the winding part. In addition, the opening 38 and the notch 39 can be used for oil drainage.

[0176] According to the compressor 1 of the present embodiment described above, the metal plate part 30 is arranged in a manner opposite to 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, so that the working fluid and the lubricating oil can be easily separated from each other. In addition, the lubricating oil scattered in a mist can be caused to collide with the plate-shaped part to effectively liquefy the lubricating oil. Therefore, through the induction heating caused by the metal plate part 30, the liquefaction of the lubricating oil scattered in a mist, and their cooperation, 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 can be obtained. Through these effects, the reduction in the amount of working fluid discharged from the compressor and the excessive discharge of the lubricating oil through the discharge pipe can be suppressed. Therefore, a compressor can be provided, which can suppress the working fluid from dissolving in the lubricating oil, and maintain the lubricity of the sliding part and the amount of working fluid discharged from the compression mechanism at a high level with high reliability.

[0177] The compressor 1 of the present embodiment described above is particularly preferably used in connection with a refrigerant circuit of a refrigeration and air conditioning device. The compressor 1 of the present embodiment can be used to compress the refrigerant circulating in the refrigerant circuit. The compressor 1 of the present embodiment can be applied to a refrigerant circuit including, for example, a condenser for condensing the refrigerant compressed by the compressor 1, a pressure reducer for decompressing the refrigerant condensed by the condenser, and an evaporator for evaporating the refrigerant decompressed by the pressure reducer.

[0178] As a refrigeration and air conditioning device to which the compressor 1 of this embodiment is applied, an air conditioner using a refrigerant having hydrocarbon as a main component is preferred. Examples of such refrigerants include R290 (propane), R1270 (propylene), R600 (n-butane), and R600a (isobutane). Examples of air conditioners include room air conditioners, cabinet air conditioners, household multi-split air conditioners, business multi-split air conditioners, and building multi-split air conditioners.

[0179] The embodiments of the present invention are described above, but the present invention is not limited to the embodiments, and various modifications are included as long as they do not depart from the technical scope. For example, the embodiments are not necessarily limited to having all the structures described. In addition, a part of the structure of a certain embodiment can be replaced with other structures, or other structures can be added to the structure of a certain embodiment. In addition, for a part of the structure of a certain embodiment, other structures can be added, the structure can be deleted, and the structure can be replaced.

[0180] For example, the compressor 1 is a scroll compressor, but as a type of compressor provided with metal plate parts, in addition to the scroll compressor, a screw compressor, a rotary compressor, a twin-rotary compressor, a two-stage compression rotary compressor, a swing compressor in which rollers and blades are integrated, etc. can also be used.

[0181] In addition, the metal plate component 30 is arranged outside the insulator 13, but it can also be arranged inside the insulator 13. In addition, the metal plate component 30 is arranged outside the stator 11 in the radial direction relative to the winding part constituting the stator 11, but it can also be arranged inside the stator 11 in the radial direction without sandwiching an insulating component between the stator 11 and the winding part. In the case of such an arrangement, it is necessary to set it at a position that does not interfere with the crankshaft 6 and the rotor 12, so it can be fixed to the front end side of the teeth of the stator core 110, etc.

[0182] The sheet metal part 30 is provided in a shape in which an inner flange is formed with respect to the cylindrical main body, but may be provided in a shape in which an outer flange is formed with respect to the cylindrical main body. The outer flange is provided in a manner protruding outward in the radial direction from the outer surface of one end of the main body in a direction parallel to the central axis. The sheet metal part 30 having the outer flange may be arranged on the outside or inside of the winding part constituting the stator 11.

[0183] Explanation of symbols

[0184] 1—compressor; 2—fixed scroll; 3—orbiting scroll; 4—frame; 5—sealed container; 6—crankshaft; 7—compression chamber; 8—cross ring; 9—main bearing; 11—stator; 11a—upper coil end; 11b—lower coil end; 12—rotor; 13—insulator (insulating part); 14—insulating paper (insulating material); 15—balancing weight; 16—oil supply pipe; 17—oil storage part; 18—back pressure chamber; 28—insulator cover (insulating part); 30—metal plate part.

Claims

1. A compressor comprising: A compression mechanism portion that compresses a working fluid; a motor portion that drives the compression mechanism portion; A sealed container that accommodates the compression mechanism and the motor; a rotating shaft that transmits a driving force of the motor portion to the compression mechanism portion; and an oil reservoir for retaining the lubricating oil supplied to the sliding part at the bottom of the closed container, The compressor is characterized in that The liquid density of the working fluid when it is sucked into the compressor is smaller than that of the lubricating oil. A metal plate component facing a surface of a winding portion constituting the fixing member is provided above the fixing member of the motor portion, below the fixing member of the motor portion, or both.

2. The compressor according to claim 1, characterized in that The working fluid is propane, propylene or isobutane.

3. The compressor according to claim 1, characterized in that The sheet metal part has an oil discharge structure that allows the lubricating oil separated from the working fluid to flow down from the sheet metal part. The oil drain structure is a through hole that vertically penetrates the metal plate component, a through groove that vertically penetrates the metal plate component by cutting off the outer peripheral side of the metal plate component, or a slope provided on the metal plate component.

4. The compressor according to claim 1, characterized in that The metal plate component is provided to face at least one of an upper surface of the winding portion, an outer peripheral side surface of a coil end of the winding portion, an inner peripheral side surface of the coil end of the winding portion, and a lower surface of the winding portion.

5. The compressor according to claim 1, characterized in that The fixing member includes an insulating component which is engaged with an iron core constituting the fixing member and electrically insulates the iron core from the winding portion. The metal plate component is provided so as to sandwich the insulating component between the metal plate component and the winding portion.

6. The compressor according to claim 1, characterized in that The fixture includes an insulating material that is inserted into a slot of an iron core constituting the fixture and electrically insulates the iron core from the winding portion. The metal plate component is provided so as to sandwich the insulating material between the metal plate component and the winding portion.

7. The compressor according to claim 1, characterized in that The fixture includes: an insulating component that is engaged with an iron core constituting the fixture and electrically insulates the iron core from the winding portion; and an insulating component cover that is disposed above the insulating component and covers the winding portion and the insulating component. The metal plate component is provided so as to sandwich the insulating component cover between the metal plate component and the winding portion.

8. The compressor according to any one of claims 1 to 7, characterized in that The metal plate component is provided so that the shortest distance from the surface of the winding portion is more than 0.25 mm and less than or equal to 20 mm.

9. The compressor according to any one of claims 1 to 7, characterized in that The metal plate component is formed of a material having a larger iron loss value and a larger plate thickness than the electromagnetic steel plate constituting the iron core of the stator.

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