JP2014105672A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve separation efficiency of lubricant from discharge gas in a closed vessel, and to reduce an emission amount of lubricant to the outside of a compressor.SOLUTION: At least a part of an upper balance weight 7a attached to the upper part of a rotator 4a of an electric motor 4 is covered with a cylindrical part 10a of a discharge cover 10 attached to the lower part of a scroll compression mechanism 2, and a discharge pipe 9 attached while passing through a closed vessel 1 so as to communicate with a space in the discharge cover 10 is arranged at a position higher than the discharge cover 10. Consequently, lubricant having been blown out by centrifugal force of the upper balance weight 7a is prevented from being discharged from the discharge pipe 9 to the outside of a compressor.

Description

  The present invention relates to a scroll compressor.

  Conventionally, a scroll compressor used in a refrigeration cycle apparatus such as a refrigeration, air conditioning, or hot water supply device is a compression formed by a fixed vortex housed in a hermetic container and an oscillating vortex that rotates in opposition to the fixed vortex. Has a room. The compression chamber is gradually narrowed from the outer peripheral side toward the inner peripheral side by the rotation of the oscillating spiral, and the refrigerant gas is sucked and compressed from the outer peripheral side of the compression chamber, and from the central portion of the compression chamber It is discharged into a closed container. At this time, in the scroll compressor, it is necessary to lubricate each bearing portion. For this reason, lubricating oil is stored at the bottom of the sealed container, and this lubricating oil is supplied to each bearing portion through an oil supply hole provided in the axial direction in the crankshaft. However, the gas (discharged gas) discharged into the hermetic container and the lubricating oil are mixed, and this lubricating oil is discharged together with the discharged gas to the outside of the compressor, so that the lubricating oil inside the compressor may be exhausted. Therefore, a technique for preventing the exhaustion of lubricating oil has been proposed.

The following are known as conventional techniques for preventing the depletion of lubricating oil.
For example, a fan or vane is provided on the upper part of the rotor of the electric motor, a swirling flow is generated by the rotation of the fan or the vane, and a refrigerant flow path provided on the outer peripheral portion of the guide frame provided in the electric motor upper space There is one in which the discharge gas and lubricating oil that have passed through are prevented from being directly discharged from a refrigerant discharge pipe provided in a guide frame by the swirling flow (see, for example, Patent Document 1). Furthermore, in this conventional example, a refrigerant flow path is provided in the outer peripheral portion of the stator of the electric motor by a notch or a dent portion so that the discharge gas can be easily passed, and the flow rate of the discharge gas can be reduced. The oil separation efficiency is improved and the lubricant is not depleted.

As another conventional example, a cylindrical cover having an opening at the bottom is attached to the lower part of the frame in the upper space of the stator of the motor, and the inner diameter of the cylindrical cover is the rotation of the motor. The cylinder cover is set to cover the balance weight provided at the upper part of the rotor and smaller than the outer diameter of the rotor, and the refrigerant discharge pipe is passed through the cylindrical cover, and the opening of the refrigerant discharge pipe is formed inside the cylindrical cover. Is arranged (see, for example, Patent Document 2).
In this prior art, the lubricating oil present in the cylindrical cover is blown off and collided with the inner wall surface of the cylindrical cover by the centrifugal force of the balance weight, and the oil is separated and dropped onto the rotor of the electric motor. It is said that the oil separation efficiency is improved and the lubricating oil is prevented from being depleted by being blown off on the inner wall surface of the sealed container by the centrifugal force of the rotor.

Japanese Patent Laying-Open No. 2006-125211 (FIG. 2) JP 2002-317775 A (FIG. 6)

  However, the discharge gas and lubricating oil that have generated a swirling flow by the rotation of the fan and blades provided at the upper part of the rotor of the motor, and have passed through the refrigerant flow path in the outer peripheral part of the guide frame in the motor upper space. However, the technique disclosed in Patent Document 1 in which the swirling flow prevents direct discharge from the refrigerant discharge pipe provided in the guide frame has the following problems. In other words, the swirl flow generated by the fan and the blades affects the flow of the discharge gas, so that the discharge gas can smoothly pass through the refrigerant flow path provided on the outer periphery of the stator of the electric motor. Therefore, it cannot flow to the lower part of the stator of the motor. For this reason, there was a problem that the oil separation efficiency could not be improved.

  In particular, when operating at a high rotational speed, such as an inverter compressor, the swirl flow generated by the fan and blades becomes stronger, which has a greater effect on the flow of discharged gas than a constant speed compressor, and the stator of the motor This makes it more difficult for the discharge gas to pass through the refrigerant flow path provided on the outer periphery of the motor to the lower part of the stator of the electric motor, resulting in a problem that the oil separation efficiency is reduced and the lubricating oil flows out of the compressor. It was.

  In addition, a cylindrical cover with an open bottom is attached to the lower part of the frame in the upper space of the stator of the motor, and the cylindrical cover has an inner diameter smaller than the rotor outer diameter of the motor, In addition, the cylindrical cover is set so as to cover the balance weight provided at the upper part of the rotor, and the refrigerant discharge pipe is passed through the cylindrical cover, and the opening of the refrigerant discharge pipe is arranged inside the cylindrical cover. The technique of Patent Document 2 has the following problems. That is, in the technique of Patent Document 2, as described above, the lubricating oil present in the cylindrical cover is blown off to the inner wall surface of the cylindrical cover by the centrifugal force of the balance weight and dropped onto the rotor of the electric motor. The oil is separated by being blown off to the inner wall surface of the sealed container by the centrifugal force of the rotor. However, such a technique has a problem that the lubricating oil blown off by the centrifugal force of the balance weight is easily discharged from the opening of the refrigerant discharge pipe that passes through the cylindrical cover and opens inside the cylindrical cover.

  The present invention has been made to solve the above-described problems, and can improve the separation efficiency of the lubricating oil from the discharge gas in the sealed container, and the amount of the lubricating oil discharged to the outside of the compressor. It aims at enabling it to be able to reduce.

  A scroll compressor according to the present invention is provided on a scroll compression mechanism portion housed in an airtight container, an electric motor disposed below the scroll compression mechanism portion and rotating the scroll compression mechanism portion via a crankshaft, and an upper portion of the scroll compression mechanism portion. A first refrigerant flow path provided on the outer peripheral side of the scroll compression mechanism so that the discharged discharge space communicates with a first space provided between the scroll compression mechanism and the electric motor; The first refrigerant passage is provided on the outer peripheral side of the motor, and is attached to the upper portion of the rotor of the motor so that the first space communicates with the second space provided in the lower portion of the motor. A balance weight, a lower balance weight attached to the lower part of the rotor of the electric motor, and a cylindrical part that covers at least a part of the upper balance weight, and an opening is formed at the lower part of the scroll compression mechanism part. The discharge cover attached in this way, the third refrigerant flow path provided in the rotor of the electric motor so that the second space and the space in the discharge cover communicate with each other, and the space in the discharge cover communicate with each other. And a discharge pipe attached through the sealed container. The discharge pipe is arranged at a position higher than the discharge cover.

According to the scroll compressor of the present invention, since at least a part of the upper balance weight is covered with the cylindrical portion of the discharge cover attached to the lower portion of the scroll compression mechanism portion, the first between the scroll compression mechanism portion and the electric motor is provided. The swirling flow generated by the rotation of the rotor of the electric motor in the space, particularly the swirling flow generated when operating at a high rotation speed like an inverter compressor can be greatly reduced. For this reason, the amount of discharge gas that passes through the second refrigerant flow path provided on the outer peripheral side of the electric motor so that the first space and the second space communicate with each other increases, and the second refrigerant flow path The flow rate of the discharge gas at the time of passage decreases, and the separation efficiency of the lubricating oil from the discharge gas can be improved.
Then, by disposing the discharge pipe attached through the sealed container so as to communicate with the space in the discharge cover at a position higher than the discharge cover, the lubricating oil blown off by the centrifugal force of the upper balance weight is reduced. Therefore, it is possible to prevent the discharge pipe from being discharged out of the compressor, and to obtain a highly reliable scroll compressor.

1 is a longitudinal sectional view illustrating an overall configuration of a scroll compressor according to Embodiment 1. FIG. It is a schematic diagram which shows the flow of the discharge gas at the time of driving | running in the steady state of the scroll compressor which concerns on Embodiment 1, and lubricating oil. It is a schematic diagram showing the flow of the discharge gas at the time of driving | running in the steady state of the scroll compressor which concerns on Embodiment 2, and lubricating oil. It is a schematic diagram showing the flow of the discharge gas and lubricating oil at the time of driving | running in the steady state of the scroll compressor which concerns on Embodiment 3. It is a bottom view of the guide frame of the scroll compressor concerning Embodiment 3.

Embodiment 1. FIG.
FIG. 1 is a longitudinal sectional view showing the overall configuration of the scroll compressor according to the first embodiment. Here, a gas containing a large amount of lubricating oil is referred to as a discharge gas, and a gas obtained by separating the lubricating oil from the discharge gas is referred to as a refrigerant gas.

  As shown in FIG. 1, the scroll compressor according to the first embodiment includes a scroll compression mechanism unit 2 and an electric motor 4 that rotationally drives the scroll compression mechanism unit 2 via a crankshaft 3 in an airtight container 1. . The bottom of the sealed container 1 is a sump 6 in which the lubricating oil 5 is stored. The lubricating oil 5 is sucked up from an oil supply hole 3 f that penetrates the crankshaft 3 in the axial direction, and is supplied to the bearing portion from the upper end of the crankshaft 3. Further, an upper balance weight 7a is attached to the upper part of the rotor 4a of the electric motor 4, and a lower balance weight 7b is attached to the lower part of the rotor 4a. A refrigerant gas suction pipe 8 is connected to the scroll compression mechanism unit 2, and the refrigerant gas containing a large amount of lubricating oil discharged from the scroll compression mechanism unit 2 into the sealed container 1, that is, the discharge gas, is separated on the way. Thus, the refrigerant gas is discharged from the discharge pipe 9 to the outside of the compressor through the discharge cover 10 attached to the lower portion of the scroll compression mechanism section 2.

  Next, the scroll compression mechanism unit 2 will be described. The scroll compression mechanism unit 2 is fixed in the sealed container 1 and has a fixed spiral 12 having spiral teeth 12a on one end of the end plate, and an oscillating spiral 13 having plate-shaped spiral teeth 13a and oscillating bearings 13b of the same shape. A compliant frame 14 and a guide frame 15 are provided. Between the fixed vortex 12 and the oscillating vortex 13, a compression chamber 2 a whose volume is relatively changed by the vortex having the same shape is formed.

  The fixed spiral 12 is fastened to the guide frame 15 by a bolt (not shown) at the outer periphery, and a refrigerant gas suction pipe 8 is press-fitted through the sealed container 1 to the side surface of the fixed spiral 12. A discharge port 12c that discharges compressed discharge gas that has become high pressure is provided at the center of the base plate portion 12b of the fixed spiral 12. The discharge gas is discharged from the discharge port 12c to the discharge space 16 above the fixed spiral 12.

  The oscillating vortex 13 performs a turning motion without rotating with respect to the fixed vortex 12. A cylindrical oscillating bearing 13b is formed at the center of the oscillating vortex 13 on the side opposite to the vortex 13a of the base plate portion 13c, and the oscillating bearing 13b is provided with an oscillating portion provided above the crankshaft 3. A shaft (eccentric shaft) 3a is rotatably engaged via a rocking bearing 13b. A thrust bearing 14a for the compliant frame 14 is formed on the lower surface of the base plate portion 13c.

  The Oldham ring 11 is used on the compliant frame 14 in order to prevent rotation of the swinging spiral 13 during the eccentric turning motion. The Oldham ring 11 has two claws 11a and 11b each having a phase difference of 90 degrees (however, in FIG. 1 etc., the claw 11a on the fixed vortex 12 side and the claw 11b on the swing vortex 13 side are 180 The claw 11a is reciprocally engaged with a pair of Oldham ring grooves 12d formed substantially in a straight line on the base plate portion 12b of the fixed spiral 12. The claw 11b is reciprocally engaged with two pairs of Oldham ring grooves 13d formed substantially in a straight line on the base plate portion 13c of the swing spiral 13.

  In the compliant frame 14, the upper and lower cylindrical portions 14 b and 14 c are supported in the radial direction by the cylindrical portions 15 a and 15 b of the guide frame 15. A central bearing 14d that supports the crankshaft 3 that is rotationally driven via the electric motor 4 in the radial direction is formed at the center.

  The compliant frame 14 is provided with a bleed hole 14e penetrating in the axial direction from the inner surface of the thrust bearing 14a, and an opening on the thrust bearing side is a bleed hole provided in the base plate portion 13c of the oscillating spiral 13. It arrange | positions facing the air hole 13e. The compliant frame 14 has a pressure adjusting valve 14f. The pressure adjusting valve 14f uses a spring 14g, and is formed by the compliant frame 14 and the swing spiral 13 by the spring 14g. The pressure in the rocking bearing space 14h is controlled.

  The guide frame 15 is fixed to the sealed container 1 by shrink fitting or welding on the outer periphery, and the discharge space 16 and the first space 17 between the scroll compression mechanism 2 and the motor 4 communicate with each other. As described above, the first coolant channel 18 is formed on the outer peripheral portion of the guide frame 15 by notches, holes, dents, and the like. Therefore, the discharge gas discharged from the discharge port 12 c of the fixed spiral 12 to the discharge space 16 is discharged from the discharge space 16 through the first refrigerant channel 18 to the first between the scroll compression mechanism unit 2 and the electric motor 4. Guided to space 17.

  The compliant frame 14 is provided with sealing materials 15 c and 15 d on upper and lower cylindrical surfaces that engage with the inner diameter of the guide frame 15. The frame space 15e sealed by the upper and lower sealing materials 15c and 15d communicates only with the bleed hole 14e of the compliant frame 14, and the inside of the compression chamber supplied by the bleed hole 13e provided in the swinging spiral 13 is provided. The refrigerant gas is extracted.

  In addition, the discharge cover 10 is attached to the lower side (lower side in FIG. 1) of the guide frame 15 so that the opening portion is downward and the cylindrical portion 10a can cover the entire upper balance weight 7a. It is longer on the 4th side. The discharge cover 10 is attached to the guide frame 15 with bolts or the like. In the space between the guide frame 15 and the discharge cover 10, a discharge flow path 10b is provided. A discharge pipe 9 communicates with the discharge flow path 10 b and is attached to a position higher than the discharge cover 10 through the sealed container 1 and the guide frame 15.

  The electric motor 4 includes a rotor 4a attached to the crankshaft 3 and a stator 4b that rotationally drives the rotor 4a. The stator 4b has an upper coil end 4c and a lower coil end 4d. . Further, the outer peripheral surface of the stator 4b of the electric motor 4 is fixed to the sealed container 1 by shrink fitting or the like, and the first space 17 above the electric motor 4 and the electric motor are formed on the outer peripheral portion by notches or holes. 4 A second refrigerant channel 20 is provided so as to communicate with the second space 19 below. Further, the rotor 4a is provided with a third coolant channel 21 so that the second space 19 and the space in the cylindrical portion 10a of the discharge cover 10 communicate with each other.

  At the upper end of the crankshaft 3, there is formed a swinging shaft portion 3a that is rotatably engaged with a swinging bearing 13b of the swinging spiral 13, and a main shaft balancer 3d is fixed to the lower portion by shrink fitting. Has been. Further, a main shaft portion 3b that is rotatably engaged with the main bearing 14d of the compliant frame 14 is formed below the main shaft portion 3b. In addition, a sub shaft portion 3c that is rotatably engaged with a sub bearing 22a of the sub frame 22 is formed in the lower portion of the crankshaft 3. Between the sub shaft portion 3c and the main shaft portion 3b, the electric motor 4 is provided. The rotor 4a is fixed by shrink fitting. An upper balance weight 7a is fixed to the upper end of the rotor 4a of the electric motor 4, and a lower balance weight 7b is fixed to the lower end, and the balance between static and dynamic is adjusted by the spindle balancer 3d described above. Further, an oil pipe 3 e is press-fitted into the lower end of the crankshaft 3 so that the lubricating oil 5 collected in the oil sump 6 at the bottom of the sealed container 1 is sucked up.

  In this scroll compressor, a scroll compression mechanism portion 2 is disposed in the upper portion of the hermetic container 1, and an electric motor 4 is disposed in the lower portion. The scroll compression mechanism portion 2 is rotationally driven by the electric motor 4 via the crankshaft 3. 1 is a high-pressure shell-type scroll compressor that provides a discharge gas atmosphere.

  FIG. 2 is a schematic diagram illustrating the flow of the discharge gas and the lubricating oil when the scroll compressor according to the first embodiment is operated in a steady state. In the drawing, the white arrow indicates the flow of the discharge gas and the black paint. The arrow indicates the flow of the lubricating oil. In FIG. 2, the mixed gas (discharge gas) of the refrigerant gas and the lubricating oil discharged from the discharge port 12 c passes through the first refrigerant flow path 18 provided in the outer peripheral portion of the guide frame 15, and the inside of the sealed container 1. The first space 17 is reached. Since the entire upper balance weight 7a attached to the upper portion of the rotor 4a of the electric motor 4 is covered with the cylindrical portion 10a of the discharge cover 10, the generation of swirling flow by the upper balance weight 7a is suppressed. Therefore, the discharge gas that has reached the first space 17 smoothly passes through the second refrigerant flow path 20 provided by the notch or the recess of the outer peripheral portion of the stator 4b of the electric motor 4, and It flows into the second space 19. For this reason, the flow rate of the discharge gas decreases, and the lubricating oil is separated from the discharge gas. Thereafter, a flow that rises through the third refrigerant flow path 21 provided in the rotor 4a of the electric motor 4 is generated, and the flow rate of the discharge gas also decreases at this time, so that the lubricating oil is separated from the discharge gas.

  Next, the discharge gas that has risen through the third refrigerant flow path 21 of the rotor 4 a of the electric motor 4 passes through the cylindrical portion 10 a of the discharge cover 10 and collides with the lower portion of the guide frame 15. At that time, the lubricating oil is separated from the discharge gas and dropped downward. Further, since the discharge pipe 9 is attached at a position higher than the discharge cover 10, only the refrigerant gas separated from the lubricating oil and having a density lower than that of the lubricating oil passes through the discharge flow path 10 b and passes through the discharge cover 10. It is discharged out of the compressor from the discharge pipe 9 located above.

  In particular, when operating up to a high rotational speed like an inverter compressor, the effect of suppressing the swirling flow generated by the upper balance weight 7a is great, and the oil separation efficiency can be improved.

  As described above, in the scroll compressor according to the first embodiment, since the discharge cover 10 covers the entire upper balance weight 7a, the swirl flow generated in the first space 17 due to the rotation of the rotor 4a of the motor 4 is suppressed. can do. Therefore, the discharge gas can be smoothly lowered from the second refrigerant flow path 20 to the second space 19, and the amount of discharge gas passing through the second refrigerant flow path can be increased. As a result, the flow rate of the discharge gas when passing through the second refrigerant flow path is reduced, and the separation efficiency of the lubricating oil from the discharge gas can be improved. Furthermore, after that, by raising from the third refrigerant flow path 21 provided in the stator 4b of the electric motor 4, the flow rate of the discharge gas can be reduced and the lubricating oil can be separated. Then, the discharge gas rising from the third refrigerant flow path 21 collides with the lower portion of the guide frame 15 to further separate the lubricating oil, and only the refrigerant gas having a density lower than that of the lubricating oil is higher than the discharge cover 10. It is possible to discharge from the discharge pipe 9 installed to the outside of the compressor, and it is possible to prevent the lubricating oil from being discharged. For this reason, a scroll compressor with higher reliability can be obtained.

Embodiment 2. FIG.
FIG. 3 is a schematic diagram illustrating the flow of discharge gas and lubricating oil when the scroll compressor according to the second embodiment is operated in a steady state.
In the first embodiment described above, when the discharge gas that has risen through the third refrigerant flow path 21 provided in the rotor 4a of the electric motor 4 passes through the cylindrical portion 10a of the discharge cover 10, the inside of the cylindrical portion 10a. In addition, there is lubricating oil that is blown off to the inner wall of the cylindrical portion 10a by the centrifugal force generated by the balance weight 7a. The lubricating oil may be dropped and mixed with the rising discharge gas and discharged from the discharge pipe 9 as it is. Therefore, here, the cylindrical portion 10a of the discharge cover 10 does not cover the entire upper balance weight 7a, but covers only a part thereof, for example, to cover 1/3 or more of the height H of the upper balance weight 7a. It is a thing. As a result, the lubricating oil that is blown off and dripped onto the inner wall of the cylindrical portion 10a of the discharge cover 10 by the centrifugal force generated by the upper balance weight 7a, as shown by the arrows in FIG. It is possible to discharge the discharge cover 10 from the gap 10c. For this reason, the discharge amount of the lubricating oil to the outside of the compressor can be reduced, and a highly reliable scroll compressor can be obtained.

Embodiment 3. FIG.
FIG. 4 is a schematic diagram showing the flow of discharge gas and lubricating oil when the scroll compressor according to the third embodiment is operated in a steady state. FIG. 5 is a bottom view of the guide frame of the scroll compressor according to the third embodiment.
In the first and second embodiments, the discharge gas that has risen in the cylindrical portion 10 a of the discharge cover 10 from the third refrigerant flow path 21 provided in the rotor 4 a of the electric motor 4 is located below the guide frame 15. collide. However, particularly during high-speed operation of an inverter compressor or the like, the speed of the discharge gas that collides with the lower portion of the guide frame 15 is high, so that the oil separation efficiency is lowered and the lubricating oil may be discharged from the discharge pipe 9. Therefore, here, as shown in FIGS. 4 and 5, one or more recess portions 15 f (three in this case) are provided in the lower portion of the guide frame 15. As a result, the discharge gas that has moved up the cylindrical portion 10a of the discharge cover 10 can collide with the recess 15f at the lower portion of the guide frame 15 and be convected therein. By doing so, the flow rate of the discharge gas is reduced, the oil separation efficiency is further improved, and the lubricating oil drops downward. Then, only the refrigerant gas having a density lower than that of the lubricating oil passes through the discharge passage 10b and is discharged out of the compressor from the discharge pipe 9 above the discharge cover. Furthermore, by providing a plurality of recesses 15f at the lower part of the guide frame 15, ribs 15g are formed between the recesses 15f, so that the strength of the guide frame 15 can be increased. Therefore, the amount of lubricating oil discharged outside the compressor can be further reduced, and the strength of the guide frame 15 can be increased at the same time, so that a scroll compressor with higher reliability can be obtained.

  DESCRIPTION OF SYMBOLS 1 Airtight container, 2 Scroll compression mechanism part, 2a Compression chamber, 3 Crankshaft, 3a Oscillating shaft, 3b Main shaft, 3c Sub shaft, 3d Main shaft balancer, 3e Oil pipe, 3f Oil supply hole, 4 Electric motor, 4a Rotor, 4b Stator, 4c Upper coil end, 4d Lower coil end, 5 Lubricating oil, 6 Oil sump, 7a Upper balance weight, 7b Lower balance weight, 8 Suction pipe, 9 Discharge pipe, 10 Discharge cover, 10a Cylindrical part of discharge cover 10b Discharge flow path, 10c Clearance between cylindrical portion of discharge cover and upper balance weight, 11 Oldham ring, 11a Claw on fixed spiral side, 11b Claw on swing spiral side, 12 Fixed spiral, 12a Spiral tooth, 12b Base plate Part, 12c discharge port, 12d Oldham ring groove, 13 swing spiral, 13a spiral tooth, 13b swing bearing 13c Base plate part, 13d Oldham ring groove, 13e Extraction hole, 14 compliant frame, 14a Thrust bearing, 14b Upper cylindrical part, 14c Lower cylindrical part, 14d Main bearing, 14e Extraction hole, 14f Pressure adjustment valve, 14g Spring, 14h Oscillating bearing space, 15 guide frame, 15a upper cylindrical portion, 15b lower cylindrical portion, 15c upper sealing material, 15d lower sealing material, 15e frame space, 15f recessed portion, 15g rib, 16 discharge space, 17 first space, 18 1st refrigerant | coolant flow path, 19 2nd space, 20 2nd refrigerant | coolant flow path, 21 3rd refrigerant | coolant flow path, 22 Sub-frame, 22a Sub bearing.

Claims (3)

A scroll compression mechanism housed in a hermetic container, and an electric motor disposed below the scroll compression mechanism and rotating the scroll compression mechanism via a crankshaft;
On the outer peripheral side of the scroll compression mechanism part, the discharge space provided in the upper part of the scroll compression mechanism part and the first space provided between the scroll compression mechanism part and the electric motor communicate with each other. A provided first refrigerant flow path;
A second refrigerant channel provided on the outer peripheral side of the electric motor so that the first space communicates with a second space provided in a lower part of the electric motor;
An upper balance weight attached to an upper portion of the rotor of the electric motor;
A lower balance weight attached to the lower part of the rotor of the electric motor;
A discharge cover that has a cylindrical portion that covers at least a portion of the upper balance weight, and is attached to a lower portion of the scroll compression mechanism portion with an opening portion downward;
A third refrigerant flow path provided in the rotor of the electric motor so that the second space communicates with the space in the discharge cover;
A discharge pipe attached through the sealed container so as to communicate with the space in the discharge cover,
The scroll compressor, wherein the discharge pipe is arranged at a position higher than the discharge cover.   2. The scroll compressor according to claim 1, wherein the cylindrical portion of the discharge cover covers a part of the upper balance weight and covers 1/3 or more of the height.   The scroll compressor according to claim 1, wherein at least one recess is provided in a lower portion of the scroll compression mechanism.

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