JP2015108334A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a scroll compressor which prevents a refrigeration oil or a mixture of the refrigeration oil and a refrigerant from being agitated and reduces an amount of the refrigeration oil flowing out to the exterior of a closed container during driving of an electric motor.SOLUTION: A scroll compressor includes: a closed container 10 where a refrigeration oil is stored at a bottom part; a compression mechanism part 14 which compresses a refrigerant suctioned into the closed container 10; an electric motor 5 which is formed by a motor rotor 5a and a motor stator 5b and drives the compression mechanism part 14 connected with the electric motor 5 through a main shaft 6; a sub frame 8 which is fastened to the closed container 10 and rotatably supports the main shaft 6 from the lower side of the electric motor 5; a lower balance weight 15b provided on a lower end surface of the motor rotor 5a; and a fixed cup 18 which is provided at an upper end of the sub frame 8 and encloses the lower balance weight 15b.

Description

  The present invention relates to a scroll compressor that suppresses the amount of refrigeration oil flowing out of a sealed container.

  Conventionally, in a scroll compressor that compresses a refrigerant introduced into a sealed container using a compression mechanism unit driven by an electric motor element, there is one that suppresses the amount of refrigerating machine oil flowing out of the sealed container (for example, Patent Documents). 1 and 2).

  The scroll compressor shown in Patent Document 1 includes a motor (3) having a compression element (2) in a lower part of a vertical hermetic casing (1) and a drive shaft (4) in the upper part of the compression element (2). ). A bearing (15) of the drive shaft (4) is provided at the upper portion of the motor, and an oil supply pump (8) is provided at the lower portion of the drive shaft (4). The oil supply pump (8) communicates with the oil supply passage (18) for supplying oil to the bearing (15), and oil is supplied to the bearing (15) on the outer peripheral surface of the rotor (31) of the motor (3). Provided with a spiral groove (19) for forcibly returning the oil to the bottom and forcibly supplying oil to the upper bearing (15), and supplying the oil after lubrication without providing a special oil separator Oil can be returned to the pump side.

  Moreover, the scroll compressor shown by patent document 2 is connected by the scroll compression mechanism part (11) which compresses a refrigerant | coolant inside a casing (3), a scroll compression mechanism part (11), and a drive shaft (15). A drive motor (13) for driving the scroll compression mechanism (11) is accommodated, and the scroll compression mechanism (11) is supported by the casing (3) by the main frame (21), and the drive motor (13). The drive shaft (15) is supported by the casing (3) by a bearing plate (8), and the bearing plate (8) has an opening (8E) communicating with the upper and lower spaces, and is connected to the drive motor (13) and the bearing. A cover (80) covering the periphery of the drive shaft (15) with the plate (8) is provided, and the cover (80) is divided into a size enough to pass through the opening (8E). Comprising a number of cover members (80A, 80B).

JP-A-5-302581 (for example, see FIG. 1) JP 2013-47481 A (see, for example, FIG. 1)

  However, in the conventional scroll compressors as shown in Patent Documents 1 and 2, the balance weight provided at the lower end of the rotor of the electric motor is rotated by driving the electric motor at the start of operation. When the liquid level of the refrigerating machine oil or the mixed liquid of the refrigerating machine oil and the refrigerant is near the lower end of the electric motor element or above the lower end of the electric motor element, the balance weight causes the refrigerant oil or the refrigerating machine oil and the refrigerant to The mixed solution might be stirred. As a result, there is a problem that the refrigeration oil flows out of the sealed container and the reliability of the bearing is lowered, and further, the amount of oil in the refrigeration circuit is increased and the cycle efficiency is lowered.

  The present invention has been made to solve the above-described problems, and prevents the refrigerating machine oil or the mixed liquid of the refrigerating machine oil and the refrigerant from being stirred when the electric motor is driven, so that the refrigerating machine oil flows out of the sealed container. It is an object to obtain a scroll compressor that suppresses the amount to be generated.

  The scroll compressor according to the present invention includes a sealed container in which refrigeration oil is stored at the bottom, a compression mechanism that compresses refrigerant sucked into the sealed container, a motor rotor, and a motor stator. An electric motor that drives the compression mechanism connected through a shaft; a subframe that is fixed to the hermetic container and rotatably supports the shaft from the lower side of the motor; and a lower end surface of the motor rotor. A balance weight provided; and a fixed cup provided at an upper end of the subframe and surrounding the balance weight.

  According to the scroll compressor according to the present invention, since the fixed cup is provided at the upper end of the subframe fixed to the hermetic container, the fixed cup does not rotate even when the electric motor is driven. The balance weight is surrounded by the fixed cup. Therefore, it is possible to prevent the refrigerating machine oil or the mixture of the refrigerating machine oil and the refrigerant from being stirred by the rotation of the balance weight, the amount of the refrigerating machine oil flowing out of the sealed container can be suppressed, the reliability of the bearing is improved, and the freezing The cycle efficiency of the circuit is improved.

It is a longitudinal cross-sectional view of the scroll compressor which concerns on Embodiment 1 of this invention. It is a principal part enlarged view of FIG. It is a cross-sectional view of the guide frame in the AA cross section of FIG. It is a cross-sectional view of the electric motor stator in the BB cross section of FIG. It is a longitudinal cross-sectional view of the fixed cup which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the penetration flow path of the electric motor rotor which concerns on Embodiment 5 of this invention. It is a figure showing the relationship between the longitudinal cross-sectional area of the clearance gap of the scroll compressor which concerns on Embodiment 5 of this invention, and the circulation amount of refrigerating machine oil.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below. Moreover, in the following drawings, the relationship of the size of each component may be different from the actual one.

Embodiment 1 FIG.
1 is a longitudinal sectional view of a scroll compressor 100 according to Embodiment 1 of the present invention, and FIG. 2 is an enlarged view of a main part of FIG.
A scroll compressor 100 according to the first embodiment of the present invention includes a fixed scroll 1 and an orbiting scroll 2 inside a hermetic dome-shaped hermetic container 10, a compression mechanism unit 14 that compresses refrigerant, and an electric motor. An electric motor 5 configured to include a rotor 5a and an electric motor stator 5b and driving a compression mechanism unit 14 connected via a main shaft 6 is provided.

  The fixed scroll 1 is composed of a base plate portion 1a and plate-like spiral teeth 1b, and an outer peripheral portion thereof is fastened to the guide frame 4 by bolts (not shown). A plate-like spiral tooth 1b is provided on one surface (the lower side in FIG. 1) of the base plate portion 1a, and at the same time, two Oldham guide grooves 1c are formed on the outer periphery of the fixed scroll 1 on a substantially straight line. Is formed. Further, a fixed side key 9a of the Oldham mechanism 9 is engaged with the Oldham guide groove 1c so as to be reciprocally slidable. A discharge port 1d through which refrigerant is discharged is formed at the center of the base plate portion 1a. Further, a suction pipe 13 is press-fitted into the fixed scroll 1 so as to penetrate the sealed container 10 so that the suction port 1e is on the inner side.

  The orbiting scroll 2 is composed of a base plate portion 2a and plate-like spiral teeth 2b. A plate-like spiral tooth 2b having substantially the same shape as the plate-like spiral tooth 1b of the fixed scroll 1 is provided on one surface (upper side in FIG. 1) of the base plate portion 2a. The teeth 1b and the plate-like spiral teeth 2b of the orbiting scroll 2 geometrically form a compression chamber 1f. And the refrigerant | coolant suck | inhaled in the airtight container 10 is compressed with the volume change of this compression chamber 1f. Further, the surface of the base plate portion 2a opposite to the surface on which the plate-like spiral teeth 2b are provided (the lower side in FIG. 1 and hereinafter referred to as the lower surface) has a hollow cylindrical boss at the center thereof. 2d is provided, and the swinging shaft portion 6a at the upper end portion of the main shaft 6 is rotatably supported. Further, a thrust surface 2f is formed on the lower surface of the base plate portion 2a on the outer peripheral side of the boss portion 2d, and can be slidably pressed against the thrust bearing 3a of the compliant frame 3.

  Two Oldham guide grooves 2c having a phase difference of 90 degrees with the Oldham guide groove 1c of the fixed scroll 1 are formed on the outer peripheral portion of the base plate portion 2a of the orbiting scroll 2 in a substantially straight line. The swing-side key 9b of the Oldham mechanism 9 is engaged with the guide groove 2c so as to be slidable back and forth. The base plate 2a is formed with an orbiting scroll bleed hole 2g penetrating the compression chamber 1f and the thrust surface 2f, and has a structure for extracting refrigerant gas during compression and guiding it to the thrust surface 2f. .

  The compliant frame 3 is supported in the radial direction by two cylindrical surfaces 3p and 3s provided on the outer periphery of the compliant frame 3 by cylindrical surfaces 4c and 4d provided on the inner periphery of the guide frame 4. Are formed with a main bearing 3c for supporting the main shaft 6 rotated by the electric motor 5 in the radial direction and an auxiliary main bearing 3d. Further, a communication hole 3e penetrating in the axial direction from the surface of the thrust bearing 3a is formed, and an opening 3t of the thrust bearing 3a is formed at a position facing the swing scroll bleed hole 2g.

  Further, a sliding surface 3b on which the Oldham mechanism annular portion 9c reciprocates is formed outside the thrust bearing 3a of the compliant frame 3, and the base plate outer peripheral space 2k and the frame upper space 4a communicate with each other. The communicating hole 3f is formed so as to communicate with the inside of the Oldham mechanism annular portion 9c. Further, the compliant frame 3 is provided with an intermediate pressure adjusting valve 3g and an intermediate pressure adjusting valve retainer 3h for adjusting the pressure in the outer diameter space 2n of the boss portion, and an intermediate pressure adjusting valve for accommodating the intermediate pressure adjusting spring 3k. A space 3n is formed. Then, the intermediate pressure adjusting spring 3k is retracted from the natural length and stored.

FIG. 3 is a cross-sectional view of the guide frame 4 taken along the line AA in FIG.
As shown in FIG. 3, the outer peripheral surface of the guide frame 4 is fixed to the hermetic container 10 by shrink fitting or welding, and the outer peripheral portion thereof is a passage for a mixed gas of refrigerant and refrigerating machine oil. One notch 4f is formed. Further, as shown in FIG. 1, the first notch 4 f is formed at a position opposite to the discharge pipe 12. In addition, a first discharge passage 4g that communicates from the center of the lower end of the guide frame 4 to the side surface is provided, and the discharge pipe 12 penetrates the sealed container 10 and the tip portion 12a is provided in the first discharge passage 4g. It has been. One surface (lower side in FIG. 1) of the guide frame 4 is provided with a cover 16 having an opening 4h and forming a second discharge passage 16a communicating with the first discharge passage 4g and an opening 16b.

  A frame lower space 4b formed by the inner side surface of the guide frame 4 and the outer side surface of the compliant frame 3 is partitioned by an upper ring-shaped sealing material 7a and a lower ring-shaped sealing material 7b. It should be noted that ring-shaped seal grooves for accommodating the upper ring-shaped seal material 7 a and the lower ring-shaped seal material 7 b are formed at two locations on the inner peripheral surface of the guide frame 4, and these seal grooves are formed on the compliant frame 3. It may be formed on the outer peripheral surface. The frame lower space 4b communicates only with the communication hole 3e of the compliant frame 3, and has a structure that encloses the refrigerant gas being compressed supplied from the swing scroll bleed hole 2g. Further, the space on the outer peripheral side of the thrust bearing 3a surrounded by the base plate portion 2a of the orbiting scroll 2 and the compliant frame 3, that is, the base plate outer peripheral space 2k, is a low pressure space of an intake gas atmosphere (intake pressure). It has become.

  The electric motor rotor 5a is arranged inside the electric motor stator 5b, and a through passage 5f is formed in the inside along the axial direction. The electric motor stator 5b is disposed outside the electric motor rotor 5a, and an electric motor stator coil 5c is wound around the electric motor stator 5b. A main shaft portion 6b of the main shaft 6 is fixed inside the electric motor rotor 5a, and the main shaft 6 is also rotated by the rotation of the electric motor rotor 5a, and a driving force is applied to the compression mechanism portion 14 connected via the main shaft 6. Is telling. Further, a second cutout portion 5g serving as a mixed gas passage between the refrigerant and the refrigerating machine oil is formed between the outer peripheral portion of the motor stator 5b and the sealed container 10.

  The main shaft 6 is formed with an oscillating shaft portion 6a that is rotatably supported by the oscillating bearing 2e of the oscillating scroll 2 at the upper end portion thereof, and a main shaft balance weight 6f is fitted on the lower side thereof. Yes. Further, a main shaft portion 6b that is rotatably supported by the main bearing 3c and the auxiliary main bearing 3d of the compliant frame 3 is formed below the main shaft portion 6b. Further, the lower side of the main shaft 6 is formed with a sub-shaft portion 6c that is rotatably supported by a sub-bearing 8a of a sub-frame 8 provided on the lower side of the electric motor 5, and the outer peripheral surface of the sub-frame 8 is It is fixed to the closed container 10 by shrink fitting or welding. Moreover, the electric motor rotor 5a is shrink-fitted between the auxiliary shaft portion 6c and the main shaft portion 6b described above. Refrigerator oil is stored in the oil reservoir 11 at the bottom of the sealed container 10, and the refrigeration oil is sucked up from an oil supply port 6 d formed on the lower end surface of the main shaft 6 by an oil supply mechanism provided on the main shaft 6.

  An upper balance weight 15a is fixed to the upper end surface of the motor rotor 5a, and a lower balance weight 15b is fixed to the lower end surface, respectively. Dynamic balance. In other words, these balance weights balance the electric motor 5 when it is stopped and cancel the unbalance between the centrifugal force and the moment generated in the compression mechanism 14 when the electric motor 5 is driven. An upper cup 17 is provided at the upper end of the motor rotor 5a so as to surround the upper balance weight 15a, and a fixed cup 18 is provided at the upper end of the subframe 8 so as to surround the lower balance weight 15b. . The fixed cup 18 includes a cup inner space 18e that encloses the lower balance weight 15b (formed inside the fixed cup 18) and a lower balance weight 15b in the space from the upper end of the subframe 8 to the lower balance weight 15b. The cup outer space 18f that is not included (formed outside the fixed cup 18) is shielded. As shown in FIG. 2, a gap space 18d is formed between the upper end of the fixed cup 18 and the lower end of the motor rotor 5a.

FIG. 4 is a cross-sectional view of the electric motor stator 5b in the BB cross section of FIG.
As shown in FIG. 4, the outer peripheral surface of the electric motor stator 5b is fixed to the sealed container 10 by shrink fitting or welding, and the outer peripheral portion serves as a mixed gas passage of refrigerant and refrigeration oil. A second notch 5g is provided. Moreover, as shown in FIG. 1, the glass terminal 10a is installed in the side surface of the airtight container 10, and the lead wire 5h from the electric motor stator 5b is joined.

Next, the operation | movement at the time of the driving | operation of the scroll compressor 100 which concerns on Embodiment 1 is demonstrated.
When the scroll compressor 100 is started up and operated, the suction refrigerant is sucked from the suction pipe 13 and enters the compression chamber 1 f formed by the plate-like spiral teeth 1 b of the fixed scroll 1 and the plate-like spiral teeth 2 b of the swing scroll 2. enter. The orbiting scroll 2 driven by the electric motor 5 reduces the volume of the compression chamber 1f with an eccentric orbiting motion. Due to this compression stroke, the suction refrigerant becomes high pressure. In the compression stroke, the intermediate-pressure refrigerant gas is compressed from the swing scroll bleed hole 2g of the swing scroll 2 through the communication hole 3e of the compliant frame 3 to the frame lower space 4b. An intermediate pressure atmosphere in the space 4b is maintained.

  The mixed gas of the refrigerant and the refrigerating machine oil sucked from the suction port 1e of the fixed scroll 1 and discharged from the discharge port 1d through the compression stroke is a first notch portion 4f formed on the outer peripheral portion of the guide frame 4. And it guide | induces to the bottom face of the airtight container 10 through the 2nd notch part 5g formed in the outer peripheral part of the electric motor stator 5b. The mixed gas of the refrigerant and the refrigerating machine oil is separated in the process of being led to the bottom surface of the sealed container 10. The separated refrigerant gas passes through the discharge pipe 12 through the clearance space 18d between the upper end of the fixed cup 18 and the lower end of the electric motor rotor 5a, and the through flow path 5f of the electric motor rotor 5a, and is outside the sealed container 10. Released.

Next, the state at the time of the stop of the scroll compressor 100 in Embodiment 1 is demonstrated.
If the temperature of the scroll compressor 100 is low when the scroll compressor 100 is stopped, the refrigerant in the refrigeration circuit is liquefied and flows into the scroll compressor 100 to become a mixed liquid with the refrigeration oil, and the liquid level of the mixed liquid is It reaches near the lower end of the electric motor stator coil 5c wound around the electric motor stator 5b or up to the upper end of the lower end of the electric motor stator coil 5c.

Next, the operation at the start of operation of the scroll compressor 100 in the first embodiment will be described.
Since the fixed cup 18 is provided at the upper end of the subframe 8, the fixed cup 18 does not rotate even when the electric motor 5 is driven. Further, the lower balance weight 15 b is surrounded by the fixed cup 18. Therefore, the stirring of the refrigerating machine oil or the mixed liquid of the refrigerating machine oil and the refrigerant due to the rotation of the lower balance weight 15b can be prevented, the amount of the refrigerating machine oil flowing out of the sealed container can be suppressed, and all bearings (swinging bearing 2e, thrust) The reliability of the bearing 3a, the main bearing 3c, the auxiliary main bearing 3d, and the auxiliary bearing 8a) is improved, and further, the cycle efficiency of the refrigeration circuit is improved.

  The refrigerating machine oil may be compatible or incompatible with the refrigerant. In the case of the compatible refrigerating machine oil, the refrigerating oil discharged into the refrigerating circuit together with the refrigerant flowing from the refrigerating circuit when the scroll compressor 100 is stopped. By returning the machine oil to the scroll compressor 100, the liquid level of the mixed liquid becomes higher than that of the incompatible refrigerating machine oil. Therefore, the fixed cup 18 is more effective when using compatible refrigerating machine oil.

Embodiment 2. FIG.
Next, a scroll compressor according to Embodiment 2 will be described. In the second embodiment, the scroll compressor is sealed until the liquid level of the refrigeration oil is above the lower end of the motor stator coil 5c wound around the motor stator 5b.
Hereinafter, the description of the structure and operation common to the first embodiment will be omitted.
When the scroll compressor is installed in an air conditioner with a large refrigeration circuit or a refrigerator, in order to maintain the reliability of the scroll compressor, the refrigeration sealed in the scroll compressor as the refrigerant amount in the refrigeration circuit increases. The machine oil is increased and sealed until the liquid level of the refrigeration oil is above the lower end of the electric motor 5.

  As described above, the lower balance weight 15b is surrounded by the fixed cup 18 provided at the upper end of the subframe 8 even in the state where the liquid level of the refrigerating machine oil is sealed until it is above the lower end of the electric motor 5. In addition, it is possible to prevent the refrigerating machine oil or the mixed liquid of the refrigerating machine oil and the refrigerant from being agitated by the rotation of the lower balance weight 15b, and to suppress the amount of the refrigerating machine oil flowing out of the hermetic container. Also in the machine, the reliability of all the bearings is improved, and further the cycle efficiency of the refrigeration circuit is improved.

Embodiment 3 FIG.
Next, a scroll compressor according to Embodiment 3 will be described. In Embodiment 3, the scroll compressor has a structure in which the fixed cup 18 is formed by two members.
Hereinafter, the description of the structure and operation common to the first embodiment or the second embodiment will be omitted.
FIG. 5 is a longitudinal sectional view of the fixed cup 18 according to the third embodiment of the present invention.
As shown in FIG. 5, the fixed cup 18 includes a pedestal member 18b for fixing to the subframe 8 and a cup member 18a surrounding the lower balance weight 15b. The cup member 18a is a pedestal at its joint 18c. It is joined to the member 18b.

  As described above, since the fixed cup 18 is formed by the two members of the pedestal member 18b and the cup member 18a, the pedestal member 18b can be thick and can maintain a fixed strength, and the cup member 18a. Can be made thin to reduce material costs.

Embodiment 4 FIG.
Next, a scroll compressor according to Embodiment 4 will be described. In Embodiment 4, in the scroll compressor, the base member 18b and the cup member 18a are joined by welding.
Hereinafter, description of the structure and operation common to any of Embodiments 1 to 3 will be omitted.
In FIG. 5, the cup member 18a is joined to the base member 18b by welding at the joint 18c.

  As described above, since the fixed cup 18 joins the base member 18b and the cup member 18a by welding, the cup member 18a is detached from the base member 18b due to a pressure difference between the cup inner space 18e and the cup outer space 18f. Can be prevented.

Embodiment 5 FIG.
Next, a scroll compressor according to Embodiment 5 will be described. In the fifth embodiment, the dimension between the electric motor rotor 5a and the fixed cup 18 is defined in the scroll compressor.
Hereinafter, description of the structure and operation common to any of Embodiments 1 to 4 will be omitted.
FIG. 6 is a cross-sectional view showing a through passage 5f of an electric motor rotor 5a according to Embodiment 5 of the present invention. 6A is a longitudinal sectional view of the electric motor rotor 5a, and FIG. 6B is a horizontal sectional view of the electric motor rotor 5a.
In the scroll compressor according to the fifth embodiment of the present invention, the vertical cross-sectional area of the gap space 18d between the upper end of the fixed cup 18 and the lower end of the motor rotor 5a shown in FIG. The dimension of the fixed cup 18 is defined so as to be larger than the vertical cross-sectional area of the through flow passage 5f of the rotor 5a.

FIG. 7 is a diagram showing the relationship between the longitudinal sectional area of the gap space of the scroll compressor according to Embodiment 5 of the present invention and the circulation amount of the refrigerating machine oil. In FIG. 7, the horizontal axis represents the vertical cross-sectional area of the gap space 18d, and the vertical axis represents the amount of refrigeration oil circulating in the refrigeration circuit during operation of the scroll compressor. Moreover, the dotted line has shown the position of the longitudinal cross-sectional area of the penetration flow path 5f of the electric motor rotor 5a in FIG.
As shown in FIG. 7, when the vertical cross-sectional area of the gap space 18d is larger than the vertical cross-sectional area of the through passage 5f of the electric motor rotor 5a, the circulation amount of the refrigerating machine oil during the operation of the scroll compressor is reduced. From this relationship, the height or diameter dimension of the fixed cup 18 is regulated so that the vertical cross-sectional area of the gap space 18d is larger than the vertical cross-sectional area of the through flow passage 5f of the motor rotor 5a, thereby scrolling during operation. The amount of refrigerating machine oil discharged from the compressor into the refrigerating circuit can be reduced. Therefore, the reliability of all the bearings is improved, and further, the cycle efficiency of the refrigeration circuit is improved.

  DESCRIPTION OF SYMBOLS 1 Fixed scroll, 1a Base plate part of (fixed scroll), 1b Plate-shaped spiral tooth of 1b (fixed scroll), 1d Oldham guide groove of (fixed scroll), 1d Discharge port, 1e Suction port, 1f Compression chamber, 2 Swing Scroll, 2a (oscillating scroll) base plate part, 2b (oscillating scroll) plate-like spiral teeth, 2c (oscillating scroll) Oldham guide groove, 2d boss part, 2e orbit bearing, 2f thrust surface, 2g Swing scroll bleed hole, 2k base plate outer space, 2n boss outer space, 3 compliant frame, 3a thrust bearing, 3b sliding surface, 3c main bearing, 3d auxiliary main bearing, 3e communication hole, 3f communication hole 3g Intermediate pressure adjustment valve, 3h Intermediate pressure adjustment valve retainer, 3k Intermediate pressure adjustment spring, 3n Intermediate pressure adjustment valve space, 3p (Compliant valve (Rame) cylindrical surface, 3t thrust bearing opening, 4 guide frame, 4a frame upper space, 4b frame lower space, 4c (guide frame) cylindrical surface, 4f first notch, 4g first discharge passage, 4h opening 5, motor, 5a motor rotor, 5b motor stator, 5c motor stator coil, 5f through passage, 5g second notch, 5h lead wire, 6 main shaft, 6a swing shaft portion, 6b main shaft portion, 6c Countershaft, 6d Oil filler port, 6f Main shaft balance weight, 7a Upper ring-shaped seal material, 7b Lower ring-shaped seal material, 8 Subframe, 8a Sub-bearing, 9 Oldham mechanism, 9a Oldham mechanism fixed key, 9b Oldham Mechanism swing side key, 9c Oldham mechanism annular part, 10 airtight container, 10a glass terminal, 11 oil reservoir, 12 discharge Pipe, 12a tip (of discharge pipe), 13 suction pipe, 14 compression mechanism, 15 balance weight, 15a upper balance weight, 15b lower balance weight, 16 cover, 16a second discharge passage, 16b opening, 17 upper cup , 18 fixed cup, 18a cup member, 18b pedestal member, 18c joint, 18d gap space, 18e cup inner space, 18f cup outer space, 100 scroll compressor.

Claims (6)

A sealed container in which refrigeration oil is stored at the bottom;
A compression mechanism for compressing the refrigerant sucked into the sealed container;
An electric motor configured by an electric motor rotor and an electric motor stator and driving the compression mechanism unit connected via a shaft;
A subframe fixed to the sealed container and rotatably supporting the shaft from the lower side of the electric motor;
A balance weight provided on a lower end surface of the electric motor rotor;
A scroll compressor, comprising: a fixed cup provided at an upper end of the subframe and surrounding the balance weight. The said fixed cup shields the inner space which contains the said balance weight, and the outer space which does not contain the said balance weight in the space from the upper end of the said sub-frame to the said balance weight. The scroll compressor described. The scroll compressor according to claim 1, wherein the liquid level of the refrigerating machine oil is sealed until the liquid level is higher than a lower end of the electric motor. The said fixing cup is comprised by joining the base member for fixing to the said sub-frame, and the cup member surrounding the said balance weight. The Claim 1 characterized by the above-mentioned. Scroll compressor. The scroll compressor according to claim 4, wherein a base member for fixing to the subframe and a cup member surrounding the balance weight are joined by welding. The electric motor rotor has a through passage formed along the axial direction inside the rotor.
The longitudinal cross-sectional area of the clearance space formed between the upper end of the said fixed cup and the lower end of the said motor rotor is larger than the vertical cross-sectional area of the said through flow path. The scroll compressor according to item.

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