JP5824669B2 - Scroll compressor - Google Patents

Description

  The present invention relates to a scroll compression device that supplies lubricating oil to a meshing portion of a fixed scroll and a swing scroll, and compresses the mesh by meshing the fixed scroll and the swing scroll.

2. Description of the Related Art Conventionally, a compression mechanism including a fixed scroll having a spiral wrap meshing with each other and a swing scroll is provided in a sealed casing, and the compression mechanism is driven by a drive motor to swing with respect to the fixed scroll. 2. Description of the Related Art A scroll compression device that performs compression by causing a scroll to rotate circularly without rotating (for example, see Patent Document 1).
In this type of scroll compressor, the low-pressure refrigerant sucked from the suction pipe is compressed by a compression mechanism, and the compressed high-pressure refrigerant is discharged out of the casing from a discharge pipe provided in the casing. Lubricating oil is supplied to each sliding portion of the compression mechanism and lubricating portions such as a meshing portion of the fixed scroll and the swing scroll. Lubricating oil to be supplied is stored in an oil sump provided at the lower part of the casing, becomes excessive at each lubricating part, and leaked lubricating oil is returned to the sump by its own weight. The orbiting scroll is inserted into an eccentric shaft portion that is provided eccentric from the axis of the drive shaft of the drive motor. Therefore, in the scroll compression apparatus, generally, an upper balancer that opposes the centrifugal force accompanying the circular motion of the orbiting scroll is provided above the drive motor of the drive shaft.

JP 2004-60532 A

However, the lubricating oil leaking from each lubricating part is scattered toward the discharge pipe provided on the outer side of the casing toward the outer peripheral direction of the casing by the rotation of the drive shaft and the upper balancer. When the lubricating oil scatters to the discharge pipe side, there is a problem that a large amount of the lubricating oil is discharged from the discharge pipe to the outside of the casing.
An object of the present invention is to provide a scroll compression device that solves the problems of the conventional techniques described above and prevents the lubricating oil from scattering to the discharge pipe side.

In order to achieve the above object, the present invention includes a scroll compression mechanism that compresses a refrigerant in a casing, and a drive motor that is connected to the scroll compression mechanism by a drive shaft and drives the scroll compression mechanism. A scroll compression mechanism is supported by the casing by a main frame, a stator of the drive motor is directly or indirectly supported by the casing, the drive shaft is connected to a rotor of the drive motor, and the drive shaft is a bearing plate Is disposed on the lower surface of the main frame, and a cup having a lower opening for preventing splashing of lubricating oil is disposed on the lower surface of the main frame, and an insulator having an annular double wall structure surrounding the stator coil on the upper surface of the stator. is arranged, the peripheral wall of the cup is suspended between the double walls of the insulator The cup, the outer circumferential wall of the cup, the outer wall of said insulator, and, from the inner wall, characterized in that it is spaced apart at least a predetermined insulation distance.

  In this configuration, the peripheral wall of the cup may be suspended inward from the center of the double wall of the insulator. The outer wall of the double wall of the insulator may be formed higher than the inner wall. The upper end of the outer wall of the double wall of the insulator may extend to a height near the lower end of the cup. Moreover, it is good also as a structure which provided the notch which pulls out the lead wire of the said winding in the outer wall of the double wall of the said insulator. The drive motor may be a DC drive motor driven by an inverter.

  According to the present invention, a cup having a lower opening for preventing scattering of lubricating oil is disposed on the lower surface of the main frame, and an insulator having an annular double wall structure surrounding the winding is disposed on the upper surface of the stator, Since the cup's peripheral wall hangs down between the insulator's double walls, the lubricating oil scatters to the cup's peripheral wall, and the lubricant that scatters to the cup's peripheral wall side passes through the cup's peripheral wall and doubles the insulator. Since it drips between the walls, the lubricating oil can be prevented from scattering toward the discharge pipe.

It is sectional drawing of the scroll compression apparatus which concerns on embodiment of this invention. It is a plane sectional view of a scroll compression device. It is a figure which shows the internal structure of the scroll compression apparatus of a modification.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a scroll compressor having an internal high pressure, and this compressor 1 is connected to a refrigerant circuit (not shown) that performs a refrigeration cycle operation by circulating the refrigerant, and compresses the refrigerant. . The compressor 1 has a vertically long cylindrical hermetic dome-shaped casing 3.
The casing 3 includes a casing body 5 that is a cylindrical body having an axis extending in the vertical direction, and a bowl-shaped upper cap having a convex surface that is welded and integrally joined to the upper end of the casing body 5. 7 and a flange-like lower cap 9 which is welded and integrally joined to the lower end portion of the casing body 5 and has a convex surface protruding downward, and is formed as a pressure vessel. Yes. A terminal cover 52 is provided on the outer peripheral surface of the casing 3, and a power supply terminal 53 that supplies power to a stator 37 described later is provided inside the terminal cover 52.

  The casing 3 accommodates a scroll compression mechanism 11 that compresses the refrigerant and a drive motor 13 that is disposed below the scroll compression mechanism 11. The scroll compression mechanism 11 and the drive motor 13 are connected to each other by a drive shaft 15 disposed so as to extend in the vertical direction in the casing 3. A gap space 17 is formed between the scroll compression mechanism 11 and the drive motor 13.

  A main frame 21 is accommodated in the upper part of the casing 3, and a radial bearing portion 28 and a boss accommodating portion 26 are formed at the center of the main frame 21. The radial bearing portion 28 is for supporting the tip (upper end) side of the drive shaft 15 and is formed to project downward from the center of one surface (lower surface) of the main frame 21. . The boss accommodating portion 26 is for accommodating a boss 25C of the swing scroll 25 described later, and is formed by recessing the center of the other surface (upper surface) of the main frame 21 downward. An eccentric shaft portion 15 </ b> A is formed at the tip (upper end) of the drive shaft 15. The eccentric shaft portion 15 </ b> A is provided so that the center thereof is eccentric from the axis of the drive shaft 15, and is inserted into the boss 25 </ b> C via the turning bearing 24 so as to be capable of turning.

  The scroll compression mechanism 11 includes a fixed scroll 23 and a swing scroll 25. The fixed scroll 23 is disposed in close contact with the upper surface of the main frame 21. The main frame 21 is attached to the inner surface of the casing body 5, and the fixed scroll 23 is fixed to the main frame 21. The swing scroll 25 meshes with the fixed scroll 23 and is disposed in the swing space 12 formed between the fixed scroll 23 and the main frame 21. The casing 3 is partitioned into a high-pressure space 27 below the main frame 21 and a discharge space 29 above the main frame 21. The spaces 27 and 29 communicate with each other through vertical grooves 71 formed to extend vertically on the outer periphery of the main frame 21 and the fixed scroll 23.

  The upper cap 7 of the casing 3 has a suction pipe 31 that guides the refrigerant in the refrigerant circuit to the scroll compression mechanism 11, and the casing body 5 has a discharge pipe 33 that discharges the refrigerant in the casing 3 to the outside of the casing 3. It is fixed in a penetrating manner. The suction pipe 31 extends vertically in the discharge space 29, and an inner end thereof passes through the fixed scroll 23 of the scroll compression mechanism 11 and communicates with the compression chamber 35, and the refrigerant is introduced into the compression chamber 35 by the suction pipe 31. Is inhaled.

  In the present embodiment, the drive motor 13 is a DC (Direct Current) motor that is driven by receiving an input from a direct current power source, and includes an annular stator 37 and a rotor 39 that is configured to be rotatable inside the stator 37. Is provided. The drive motor 13 receives a constant input voltage, and its rotational torque is controlled by a PWM (Pulse Width Modulation) inverter that controls the duty ratio of the pulse wave, that is, the period for outputting the pulse wave and the pulse width when the pulse wave is output. To drive. In the present embodiment, the drive motor 13 is a DC motor. However, in addition, the drive motor 13 may be an AC (Alternating Current) motor that is driven by receiving an input of an alternating current. good.

  The swing scroll 25 of the scroll compression mechanism 11 is drivingly connected to the rotor 39 via the drive shaft 15. The stator 37 includes a stator core 37 </ b> A and the stator coil 18. The stator core 37A is formed by stacking thin iron plates, and has a plurality of grooves inside although not shown. The stator coil 18 is formed by winding a plurality of phases of stator windings. The stator coil 18 is fitted into each groove formed in the stator core 37A and protrudes up and down the stator core 37A. Each stator coil 18 is accommodated in the insulator 19 above and below the stator core 37A. The stator coil 18 is connected to the power supply terminal 53 via a lead wire 20 (see FIG. 2) connecting the stator coils 18. The drive motor 13 rotates the rotor 39 by switching the stator coil 18 through which current flows.

The rotor 39 is formed of a ferrite magnet or a neodymium magnet and is magnetized by magnetization. As a method for magnetizing the rotor 39, after the rotor 39 is inserted into the stator 37, winding magnetization is performed by passing a current through the stator coil 18 of the stator 37 and magnetizing the rotor 39 or an external magnetizing device. There is external magnetization that is inserted into the stator 37 after being magnetized. A holder (pin holder) 58 used for positioning the rotor 39 when the rotor 39 is magnetized by winding is press-fitted inside the drive shaft 15.
The stator 37 is supported on the inner wall surface of the casing 3 by an annular spacer ring 38. The spacer ring 38 is fixed to the inner wall surface of the casing 3 by shrink fitting, and the stator 37 is fixed to the inner wall surface of the spacer ring 38 by shrink fitting. The upper end surface of the spacer ring 38 is provided below the upper end surface of the stator 37.

Below the drive motor 13, there is provided a bearing plate 8 that rotatably fits and supports the lower end portion of the drive shaft 15. The bearing plate 8 is formed in a cylindrical shape with a boss portion 8A into which the drive shaft 15 is inserted, and an arm portion 8B that is provided around the boss portion 8A at substantially equal intervals and extends in four directions and is fixed to the casing body 5. Is provided. That is, the drive shaft 15 is supported on the casing 3 by the bearing plate 8. The bearing plate 8 is formed between the arm portions 8B and has an opening 8E that communicates the upper and lower spaces.
A lower space (oil sump) 40 below the bearing plate 8 shown in FIG. 1 is maintained at a high pressure, and oil is stored in the inner bottom portion of the lower cap 9 corresponding to the lower end portion thereof. An annular plate 59 is fixed to the bearing plate 8 between the bearing plate 8 and the oil sump 40. In addition, the baffle plate 14 is supported by the annular plate 59 and provided above the annular plate 59. The baffle plate 14 is made of, for example, a thin plate-shaped punching metal having a large number of pores 14D.

  An oil supply passage 41 as a part of the high pressure oil supply means is formed in the drive shaft 15, and this oil supply passage 41 extends vertically inside the drive shaft 15 and enters an oil chamber 43 on the back surface of the swing scroll 25. Communicate. The oil supply path 41 is connected to an oil pickup 45 provided at the lower end of the drive shaft 15. A lateral hole 57 extending in the radial direction of the drive shaft 15 and penetrating the oil supply passage 41 is provided on the back side of the oil pickup 45. The holder 58 described above is press-fitted into the horizontal hole 57. The oil pickup 45 is press-fitted into the drive shaft 15 after the rotor 39 is magnetized.

  The oil pickup 45 includes a suction port 42 provided at the lower end and a paddle 44 formed above the suction port 42. The lower end of the oil pickup 45 is immersed in the lubricating oil (lubricating oil) stored in the oil sump 40, and the suction port 42 of the oil supply path 41 is opened in the lubricating oil. When the drive shaft 15 rotates, the lubricating oil stored in the oil sump 40 enters the oil supply passage 41 from the suction port 42 of the oil pickup 45 and is pumped upward along the paddle 44 of the oil supply passage 41. Then, the pumped lubricating oil is supplied to the sliding portions of the scroll compression mechanism 11 such as the radial bearing 28 and the orbiting bearing 24 through the oil supply passage 41. Further, the lubricating oil is supplied to the oil chamber 43 on the back of the orbiting scroll 25 through the oil supply passage 41, and is supplied from the oil chamber 43 to the compression chamber 35 through the communication path 51 provided in the orbiting scroll 25. The

  The main frame 21 is formed with a return oil passage 47 that penetrates the main frame 21 from the boss accommodating portion 26 in the radial direction and opens into the vertical groove 71. Of the lubricating oil supplied to the sliding portions of the scroll compression mechanism 11 and the compression chamber 35 through the oil supply passage 41, excess lubricating oil is returned to the oil sump 40 through the return oil passage 47. It is. An oil collector 46 is provided below the return oil passage 47, and the oil collector 46 extends to the vicinity of the upper end of the spacer ring 38. A plurality of notches 54 are formed on the outer peripheral surface of the stator 37 so as to extend up and down the stator 37. Lubricating oil returned from the oil supply passage 41 through the return oil passage 47 and the oil collector 46 is returned to the oil sump 40 through the notches 54 and between the arm portions 8B of the bearing plate 8. In the cross-sectional view of FIG. 1, the discharge pipe 33 is shown by a broken line for convenience of explanation, but the discharge pipe 33 is arranged out of phase with the oil collector 46.

  The fixed scroll 23 is composed of an end plate 23A and a spiral (involute) wrap 23B formed on the lower surface of the end plate 23A. On the other hand, the orbiting scroll 25 is composed of an end plate 25A and a spiral (involute) wrap 25B formed on the upper surface of the end plate 25A. The wrap 23B of the fixed scroll 23 and the wrap 25B of the swing scroll 25 are meshed with each other, so that a plurality of compression is performed between the fixed scroll 23 and the swing scroll 25 by the both wraps 23B and 25B. A chamber 35 is formed.

The orbiting scroll 25 is supported by the fixed scroll 23 via the Oldham ring 61, and a bottomed cylindrical boss 25C projects from the center of the lower surface of the end plate 25A. On the other hand, an eccentric shaft portion 15 </ b> A is provided at the upper end of the drive shaft 15, and the eccentric shaft portion 15 </ b> A is rotatably fitted to a boss 25 </ b> C of the swing scroll 25.
Further, the drive shaft 15 is provided with a counterweight portion (upper balancer) 63 below the main frame 21, and a lower balancer 77 is provided below the rotor 39. The drive shaft 15 is dynamically balanced with the orbiting scroll 25, the eccentric shaft portion 15A, and the like by the upper balancer 63 and the lower balancer 77.

  By rotating the drive shaft 15 while balancing the weight by the counterweight portion 63 and the lower balancer 77, the swing scroll 25 is revolved. As the swing scroll 25 revolves, the compression chamber 35 is configured to compress the refrigerant sucked from the suction pipe 31 as the volume between the wraps 23B and 25B contracts toward the center. Yes. A lower plate of the lower balancer 77 is provided with a rotor 39 and a regulation plate 55 that is caulked together with the lower balancer 77. The restriction plate 55 is used to restrict the rotation of the rotor 39 when the rotor 39 is wound and magnetized.

  A cup 48 is fixed to the lower side of the main frame 21 with bolts 49 so as to surround the counterweight portion 63. The cup 48 prevents the lubricating oil leaking from the clearance between the main frame 21 and the drive shaft 15 from being scattered to the discharge pipe side due to the rotation of the counterweight part 63.

  A discharge hole 73 is provided in the central portion of the fixed scroll 23, and the gas refrigerant discharged from the discharge hole 73 is discharged to the discharge space 29 through the discharge valve 75, and the main frame 21 and the fixed scroll 23. The refrigerant flows out into the high-pressure space 27 below the main frame 21 through the vertical grooves 71 provided on the outer circumferences, and the high-pressure refrigerant is discharged out of the casing 3 through the discharge pipe 33 provided in the casing body 5.

The operation of the scroll compressor 1 will be described.
When the drive motor 13 is driven, the rotor 39 rotates with respect to the stator 37, and thereby the drive shaft 15 rotates. When the drive shaft 15 rotates, the swinging scroll 25 of the scroll compression mechanism 11 does not rotate with respect to the fixed scroll 23 but only revolves. As a result, the low-pressure refrigerant is sucked into the compression chamber 35 from the peripheral side of the compression chamber 35 through the suction pipe 31, and the refrigerant is compressed as the volume of the compression chamber 35 changes. The compressed refrigerant becomes high pressure and is discharged from the compression chamber 35 through the discharge valve 75 to the discharge space 29, and through the vertical grooves 71 provided on the outer circumferences of the main frame 21 and the fixed scroll 23. The refrigerant flows out into the high-pressure space 27 below the main frame 21, and the high-pressure refrigerant is discharged out of the casing 3 through a discharge pipe 33 provided in the casing body 5. The refrigerant discharged to the outside of the casing 3 circulates through a refrigerant circuit (not shown), and is again sucked into the compressor 1 through the suction pipe 31 and compressed, and the circulation of the refrigerant is repeated.

  The flow of the lubricating oil will be described. The lubricating oil stored in the inner bottom portion of the lower cap 9 in the casing 3 is sucked up by the oil pickup 45, and this lubricating oil passes through the oil supply passage 41 of the drive shaft 15 and the scroll compression mechanism 11. Each of the sliding parts and the compression chamber 35 are supplied. The excess lubricating oil in each sliding portion of the scroll compression mechanism 11 and the compression chamber 35 is collected from the return oil passage 47 to the oil collector 46 and passes through the notch 54 provided on the outer periphery of the stator 37. And returned to the lower side of the drive motor 13.

  Further, the lubricating oil supplied to the radial bearing 30 through the oil supply passage 41 leaks from the lower end of the radial bearing portion 28, and the outer peripheral wall (peripheral wall) of the cup 48 by the rotation of the drive shaft 15 and the upper balancer 63. It is scattered on the 48A side. The lower (lower end) 48B of the cup 48 is opened. An insulator 19 that surrounds the stator coil 18 is provided on the upper surface of the stator 37, and the insulator 19 is formed in a double wall structure including an annular outer wall 19A and an inner wall 19B. The outer peripheral wall 48A of the cup 48 is closer to the inner side than the center C of the outer wall 19A and the inner wall 19B between the outer wall 19A and the inner wall 19B of the insulator 19 having a double wall structure, that is, the inner wall 19B side. And drooping. Further, the outer peripheral wall 48 of the cup 48, the outer wall 19A of the insulator 19, and the inner wall 19B are provided at positions separated from each other by a predetermined insulation distance or more.

  According to this configuration, the lubricating oil that leaks from the lower end of the radial bearing portion 28 and is scattered to the outer peripheral wall 48A side of the cup 48 by the rotation of the drive shaft 15 and the upper balancer 63 passes through the outer peripheral wall 48A. It is dropped between the outer wall 19A and the inner wall 19B of the insulator 19. Thereby, it is possible to prevent the lubricating oil scattered by the rotation of the drive shaft 15 and the upper balancer 63 from being scattered to the discharge pipe 33 provided on the outer periphery of the casing 3. It is possible to prevent a large amount of lubricating oil leaking from the lower end from being discharged out of the casing 3 from the discharge pipe 33.

  The outer wall 19 </ b> A of the insulator 19 is formed to be higher than the inner wall 19 </ b> B, and the outer wall 19 </ b> A is formed to a height at which the upper end 19 </ b> C extends to the vicinity of the lower end 48 </ b> A of the cup 48. The height of the outer wall 19A of the insulator 19 is set such that a gap g is provided between the upper end 19C and the lower end 48A of the cup 48 so that the upper end 19C is positioned slightly below the lower end 48A.

  According to this configuration, the lubricating oil that leaks from the lower end of the radial bearing portion 28 and is scattered on the outer peripheral wall 48A side of the cup 48 by the rotation of the drive shaft 15 and the upper balancer 63 passes through the outer peripheral wall 48A. Even when the drive shaft 15 and the upper balancer 63 are rotated and dropped from the cup 48 obliquely downward when being dropped between the outer wall 19A and the inner wall 19B, the outer wall 19A of the insulator 19 is dropped. It is dripped inside. As a result, it is possible to prevent the lubricating oil from being scattered on the discharge pipe 33 side provided on the outer periphery of the casing 3 and to prevent a large amount of the lubricating oil from being discharged from the casing 3 to the outside of the casing 3. .

FIG. 2 is a plan sectional view of the scroll compression device cut above the drive motor 13. The drive shaft 15 and the rotor 39 are not shown in FIG. As shown in FIG. 2, the lead wire 20 extending from the stator coil 18 is connected to the power supply terminal 53 through the upper side of the upper end 19 </ b> C of the insulator 19. Each stator coil 18 provided on the upper surface of the stator 37 is accommodated between an outer wall 19A and an inner wall 19B of an insulator 19 having a double wall structure.
The stator 37 is provided with a notch 54 that communicates the space above and below the drive motor 13. A plurality of cutouts 38 </ b> A are formed on the outer periphery of the spacer ring 38 so as to extend above and below the spacer ring 38. The lubricating oil is returned from the upper side of the drive motor 13 to the lower side of the drive motor 13 through the notches 54 and the notches 38.

  The inner wall 19B is composed of a plurality of walls 19D provided inside each stator coil 18, and a predetermined separation interval is provided between adjacent walls 19D. The lubricating oil dropped between the outer wall 19A and the inner wall 19B of the insulator 19 may be discharged below the stator 37 through the gap between the walls constituting the inner wall 19B.

  FIG. 3 is a diagram showing a modification of the scroll compressor 1 shown in FIG. In the scroll compression apparatus 1 described above, the height of the outer wall 19A of the insulator 19 is set so that the upper end 19C is positioned slightly below the lower end 48A of the cup 48, and the upper side of the upper end 19C of the outer wall 19A. The lead wire 20 is connected to the power supply terminal 53 through the through hole. In the modification shown in FIG. 3, the height of the outer wall 19 </ b> A of the insulator 19 is set so that the upper end 19 </ b> C is located above the lower end 48 </ b> A of the cup 48. Further, a cutout 14 for drawing out the lead wire 20 extending from the stator coil 18 to the outside of the insulator 19 is provided on the outer wall 19A of the insulator 19. As shown in FIG. 3, the notch 14 is formed by partially cutting the outer wall 19A from above. The lead wire 20 drawn to the outside of the insulator 19 through the notch 14 is connected to the power supply terminal 53 using the connection terminal 20A. The notch 14 is provided in the vicinity of the notch 38 </ b> A formed over the spacer ring 38. The notch 14 is provided at a position away from the discharge pipe 33 in the circumferential direction.

  According to this configuration, the lubricating oil that leaks from the lower end of the radial bearing portion 28 and is scattered by the rotation of the drive shaft 15 and the upper balancer 63 toward the outer peripheral wall 48 </ b> A side of the cup 48 is surely secured to the insulator 19. It can be dripped between the outer side wall 19 </ b> A and the inner side wall 19 </ b> B, and the lubricating oil can be prevented from being scattered on the discharge pipe 33 side provided on the outer periphery of the casing 3. As a result, a large amount of lubricating oil can be prevented from being discharged out of the casing 3 from the discharge pipe 33.

  Further, according to this configuration, even if the height of the outer wall 19A is set so that the upper end 19C of the outer wall 19A of the insulator 19 is located above the lower end 48A of the cup 48, the cut provided on the outer wall 19A is provided. Since the lead wire 20 can be drawn out of the insulator 19 from the notch 14, the insulation distance between the lead wire 20 and the cup 48 can be maintained.

  As described above, according to the embodiment to which the present invention is applied, the scroll compression mechanism 11 that compresses the refrigerant inside the casing 3, the scroll compression mechanism 11 and the drive shaft 15 are connected to drive the scroll compression mechanism 11. The scroll compression mechanism 11 is supported by the casing 3 by the main frame 21, the stator 37 of the drive motor 13 is directly or indirectly supported by the casing 3, and the rotor 39 of the drive motor 13 is supported by the rotor 39. The drive shaft 15 is connected, the drive shaft 15 is supported by the casing 3 by the bearing plate 8, and a cup 48 having a lower opening for preventing splashing of lubricating oil is disposed on the lower surface of the main frame 21, and a stator 37. An insulator 19 having an annular double wall structure surrounding the winding is disposed on the upper surface of the cup 48. Since the peripheral wall 48A is suspended insulator double walls 19A, during 19B, it is possible to collect leaked from the lubricating portions, the lubricating oil splashed by the rotation of the drive shaft 15 in the cup 48. Further, since the lubricating oil collected in the cup 48 is dropped between the double walls 19A and 19B of the insulator through the outer peripheral wall 48A of the cup 48, the lubricating oil is discharged outside the casing 3. It is possible to prevent scattering to the pipe 33 side, and it is possible to prevent a large amount of lubricating oil from being discharged from the discharge pipe 33.

  Further, according to the embodiment to which the present invention is applied, since the peripheral wall 48A of the cup 18 is suspended inward from the center of the double walls 19A and 19B of the insulator 19, the outer peripheral wall 48A of the cup 48 is suspended. Even if the lubricating oil guided below the cup 48 scatters obliquely downward from the opening below the cup 48 due to the rotation of the drive shaft 15, the lubricating oil can be dripped inside the outer wall 19 </ b> A of the insulator 19. Further, it is possible to prevent the lubricating oil from being scattered toward the discharge pipe 33 disposed outside the casing 3, and to prevent a large amount of the lubricating oil from being discharged from the discharge pipe 33.

  Further, according to the embodiment to which the present invention is applied, the outer wall 19A of the double wall of the insulator 19 is formed higher than the inner wall 19B. Lubricating oil that scatters to the side can be more effectively dropped onto the inside of the outer wall 19 </ b> A of the insulator 19. Thereby, it is possible to prevent the lubricating oil from being scattered to the side of the discharge pipe 33 disposed outside the casing 3 and to prevent a large amount of the lubricating oil from being discharged from the discharge pipe 33.

  According to the embodiment to which the present invention is applied, the upper end of the outer wall 19A of the double wall of the insulator 19 extends to a height near the lower end of the cup. Lubricating oil that scatters diagonally downward from the opening can be more reliably dropped onto the inner side of the outer wall 19A of the insulator 19. Thereby, it is possible to prevent the lubricating oil from being scattered to the side of the discharge pipe 33 disposed outside the casing 3 and to prevent a large amount of the lubricating oil from being discharged from the discharge pipe 33.

  Further, according to the embodiment to which the present invention is applied, since the notch 14 for drawing out the lead wire 20 of the winding is provided on the outer wall 19A of the double wall of the insulator 19, the lead is provided from the notch 14 provided on the outer wall 19A. The wire 20 can be pulled out to the outside of the insulator 19 and the insulation distance between the lead wire 20 and the cup 48 can be maintained.

  In addition, according to the embodiment to which the present invention is applied, the drive motor 13 is a DC drive motor that is driven with a rotational torque controlled by a PWM inverter. Miniaturization can be achieved, and further, driving by an inverter can prevent generation of useless heat due to increase / decrease of the voltage of the drive motor 13 and improve drive efficiency.

DESCRIPTION OF SYMBOLS 1 Scroll compression apparatus 3 Casing 11 Scroll compression mechanism 13 Drive motor 14 Lead wire notch 19 Insulator 19A Outer side wall 19B Inner side wall 20 Lead wire 21 Main frame 37 Stator 39 Rotor 48 Cup 48A Peripheral wall (outer peripheral wall)

Claims (6)

A scroll compression mechanism that compresses the refrigerant inside the casing, and a drive motor that is connected to the scroll compression mechanism by a drive shaft and drives the scroll compression mechanism are housed.
The scroll compression mechanism is supported by the casing by a main frame;
A stator of the drive motor is directly or indirectly supported by the casing;
The drive shaft is coupled to the rotor of the drive motor, the drive shaft is supported on the casing by a bearing plate,
A cup having a lower opening for preventing splashing of lubricating oil is disposed on the lower surface of the main frame, and an annular double-walled insulator surrounding the stator coil is disposed on the upper surface of the stator, and the peripheral wall of the cup Is suspended between the double walls of the insulator, and the cup is arranged such that the outer peripheral wall of the cup is separated from the outer wall and the inner wall of the insulator by at least a predetermined insulating distance. Scroll compressor.   The scroll compression device according to claim 1, wherein a peripheral wall of the cup is suspended inward from a center of the double wall of the insulator.   The scroll compression apparatus according to claim 1 or 2, wherein an outer wall of the double wall of the insulator is formed higher than an inner wall.   The scroll compression apparatus according to claim 3, wherein the upper end of the outer wall of the double wall of the insulator extends to a height near the lower end of the cup.   5. The scroll compressor according to claim 1, wherein a notch for drawing out the lead wire of the stator coil is provided on an outer wall of the double wall of the insulator.   The scroll compressor according to any one of claims 1 to 5, wherein the drive motor is a DC drive motor driven by an inverter.

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