Scroll Compressor

Abstract

To provide a scroll compressor that can increase an amount of oil to be supplied to a bearing part, thereby reduce damage to the bearing part, and improve refrigeration capacity and a COP.SOLUTION: In a scroll compressor according to the present invention, a vertical groove 35 having a predetermined length from an upper end of a journal part 31 is formed in the journal part 31, a first oil supply hole 36 and a second oil supply hole 37 communicating with a main shaft oil supply hole 34 and opened in the vertical groove 35 are formed, a first opening part 36a of the first oil supply hole 36 is located on the side of a lower end of the vertical groove 35, and a second opening part 37a of the second oil supply hole 37 is located on the side of an upper end of the vertical groove 35.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a scroll compressor used in cooling devices such as air conditioners and refrigerators, or refrigeration devices such as heat pump type hot water supply devices. [Background technology]

[0002] In the scroll compressor described in Patent Document 1, the main shaft is formed with a journal portion that is placed in the bearing portion, an eccentric shaft that is inserted into the boss portion, and a main shaft oil supply hole that runs from the lower end of the main shaft to the eccentric shaft, and the journal portion is formed with a groove of a predetermined length and an oil supply hole that communicates with the main shaft oil supply hole and opens into the vertical groove. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-11482 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the scroll compressor described in Patent Document 1, the grooves formed in the journal portion do not have a path for discharging the lubricating oil, so the lubricating oil supplied from the oil supply hole to the grooves is difficult to discharge out of the grooves. Therefore, the lubricating oil is difficult to supply from the oil supply hole to the grooves, and sufficient lubricating oil is not supplied to the journal portion, resulting in a decrease in refrigeration capacity and COP, or damage to the bearing portion.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a scroll compressor capable of reducing damage to the bearings and improving the refrigeration capacity and COP by increasing the amount of oil supplied to the bearings. [Means for solving the problem]

[0006] The scroll compressor of the present invention described in claim 1 has a compression mechanism 10 for compressing a refrigerant, an electric mechanism 20 for driving the compression mechanism 10, and a main shaft 30 for operating the compression mechanism 10 by being rotated by the electric mechanism 20, arranged in a sealed vessel 1, an oil reservoir 4 is formed at the bottom of the sealed vessel 1, the compression mechanism 10 has a fixed scroll 11 and an orbiting scroll 12, the fixed scroll 11 has a disk-shaped fixed scroll end plate 11a, and a rotating scroll 12 is connected to the fixed scroll end plate 11a. The orbiting scroll 12 includes a disk-shaped orbiting scroll end plate 12a, an orbiting spiral wrap 12b standing on the wrap side end surface of the orbiting scroll end plate 12a, and a boss portion 12c formed on the opposite side of the wrap side end surface of the orbiting scroll end plate 12a. The fixed spiral wrap 11b and the orbiting spiral wrap 12b are meshed with each other to form a plurality of compression chambers 15 between the fixed spiral wrap 11b and the orbiting spiral wrap 12b. A main bearing 40 supporting the fixed scroll 11 and the orbiting scroll 12 is provided below the fixed scroll 11 and the orbiting scroll 12. The main bearing 40 is formed with a bearing portion 41 that supports the main shaft 30 and a boss accommodating portion 42 that accommodates the boss portion 12c. The main shaft 30 is formed with a journal portion 31 disposed in the bearing portion 41, an eccentric shaft 32 inserted into the boss portion 12c, and a main shaft oil supply hole 34 extending from a lower end portion 33 of the main shaft 30 to the eccentric shaft 32. a scroll compressor having a journal portion 31 formed with a longitudinal groove 35 having a predetermined length extending from an upper end of the journal portion 31, a first oil supply hole 36 and a second oil supply hole 37 communicating with the longitudinal groove 35 and opening into the longitudinal groove 35, a first opening 36a of the first oil supply hole 36 being located on the lower end side of the longitudinal groove 35, and a second opening 37a of the second oil supply hole 37 being located on the upper end side of the longitudinal groove 35. The longitudinal groove 35 reaches the upper end of the journal portion 31, so that the lubricating oil supplied to the longitudinal groove 35 is discharged from the upper end of the journal portion 31. It is characterized by: A second aspect of the present invention is the scroll compressor according to the first aspect, wherein the second opening 37a is enlarged by a chamfered portion 37b. The present invention described in claim 3 is characterized in that, in the scroll compressor described in claim 1 or claim 2, the upper part 41u of the bearing part 41 is a thicker part than the lower part 41d of the bearing part 41, the first opening 36a is located in the lower part 41d of the bearing part 41, and the second opening 37a is located in the upper part 41u of the bearing part 41. The present invention according to a fourth aspect is characterized in that, in the scroll compressor according to any one of the first to third aspects, a slit 44 is formed in the inner circumferential surface of the bearing portion 41, the slit 44 extending from the upper end to the lower end. The present invention according to a fifth aspect is characterized in that, in the scroll compressor according to the fourth aspect, a bush 41a is disposed on the inner periphery of the bearing portion 41, and the slit 44 is formed by the bush 41a. A sixth aspect of the present invention is the scroll compressor according to any one of the first to fifth aspects, wherein a ring-shaped flexible groove 46 is formed on the upper end surface 41b of the bearing portion 41. The present invention described in claim 7 is characterized in that, in the scroll compressor described in any one of claims 1 to 6, when the total length of the bearing portion 41 is L and the inner diameter of the bearing portion 41 is D, L / D≦1. The present invention as set forth in claim 8 provides a scroll compressor as set forth in any one of claims 1 to 7, which is characterized in that -1 The engine is characterized by having the following operating ranges: Effect of the Invention

[0007] According to the present invention, the longitudinal grooves reach the upper end of the journal portion, and therefore the lubricating oil supplied to the longitudinal grooves is discharged from the upper end of the journal portion, and therefore sufficient lubricating oil is supplied to the longitudinal grooves from the first oil feed hole and the second oil feed hole. Also, the first opening of the first oil feed hole is located on the lower end side of the longitudinal groove, and the second opening of the second oil feed hole is located on the upper end side of the longitudinal groove, so that the amount of lubricating oil supplied to the longitudinal grooves can be increased in a balanced manner, and damage to the upper end of the bearing can be reduced, refrigeration capacity and COP can be improved, and input can be reduced. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a vertical sectional view of a scroll compressor according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a side view showing the main shaft of the scroll compressor shown in FIG. [Diagram 3] FIG. 2 is a cross-sectional view showing a bearing portion and a journal portion of the scroll compressor shown in FIG. [Figure 4] FIG. 2 shows the main bearing of the scroll compressor shown in FIG. 1. [Diagram 5] A diagram showing the performance verification results of the scroll compressor shown in Figure 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In a scroll compressor according to a first embodiment of the present invention, a vertical groove is formed in a journal portion from an upper end of the journal portion to a predetermined length, and a first oil feed hole and a second oil feed hole are formed in the journal portion, the first oil feed hole being connected to a main shaft oil supply hole and opening into the vertical groove, a first opening of the first oil feed hole being located on the lower end side of the vertical groove, and a second opening of the second oil feed hole being located on the upper end side of the vertical groove. In addition, the longitudinal grooves reach the upper end of the journal portion, so that the lubricating oil supplied to the longitudinal grooves is discharged from the upper end of the journal portion. According to this embodiment, since the longitudinal groove reaches the upper end of the journal portion, the lubricating oil supplied to the longitudinal groove is discharged from the upper end of the journal portion, and therefore sufficient lubricating oil is supplied to the longitudinal groove from the first oil feed hole and the second oil feed hole. Furthermore, since the first opening of the first oil feed hole is located on the lower end side of the longitudinal groove and the second opening of the second oil feed hole is located on the upper end side of the longitudinal groove, the amount of lubricating oil supplied to the longitudinal groove can be increased in a balanced manner, and damage to the upper end of the bearing can be reduced, refrigeration capacity and COP can be improved, and input can be reduced.

[0010] In the second embodiment of the present invention, in the scroll compressor according to the first embodiment, the second opening is enlarged by a chamfered portion. According to this embodiment, by enlarging the second opening by the chamfered portion, it is possible to supply lubricating oil with high oil pressure (due to the centrifugal force caused by the rotation of the main shaft) discharged from the second oil supply hole to a wide area at the upper end of the bearing.

[0011] A third embodiment of the present invention is a scroll compressor according to the first or second embodiment, in which an upper part of the bearing part is thicker than a lower part of the bearing part, the first opening part is located at the lower part of the bearing part, and the second opening part is located at the upper part of the bearing part. According to this embodiment, by positioning the second opening part at the upper part of the bearing part which is thick, damage to the thick part (upper end part of the bearing) which is difficult to deform can be reduced, and the refrigeration capacity and COP can be improved, and the input power can be reduced.

[0012] In a fourth embodiment of the present invention, in the scroll compressor according to any one of the first to third embodiments, a slit is formed on the inner peripheral surface of the bearing portion from the upper end to the lower end. According to this embodiment, when the longitudinal groove passes through the slit due to the rotation of the main shaft, the lubricating oil can be discharged from the slit, so that the lubricating oil can be supplied to the lower end of the journal portion 31, which does not have the longitudinal groove.

[0013] A fifth embodiment of the present invention is a scroll compressor according to the fourth embodiment, in which a bush is disposed on the inner periphery of the bearing portion, and the slit is formed by the bush. According to this embodiment, the slit can be formed by the bush.

[0014] A sixth embodiment of the present invention is a scroll compressor according to any one of the first to fifth embodiments, in which a ring-shaped flexible groove is formed on the upper end surface of the bearing part. According to this embodiment, by forming a flexible groove in the upper part of the bearing part, which is a thick part, deformation can be easily caused, and the stress generated at the upper end part of the bearing due to the bearing load can be reduced.

[0015] A seventh embodiment of the present invention is a scroll compressor according to any one of the first to sixth embodiments, in which, where L is the overall length of the bearing portion and D is the inner diameter of the bearing portion, L / D≦1. This embodiment is highly effective for bearing portions in which L / D≦1.

[0016] An eighth embodiment of the present invention is a scroll compressor according to any one of the first to seventh embodiments, -1 The following rotation speeds are included in the operating range. -1 It is highly effective at the following rotation speeds: EXAMPLES

[0017] A scroll compressor according to an embodiment of the present invention will be described below, however, the present invention is not limited to the following embodiment. FIG. 1 is a vertical sectional view of a scroll compressor according to the present embodiment. Within the sealed container 1, there are arranged a compression mechanism unit 10 that compresses the refrigerant, an electric mechanism unit 20 that drives the compression mechanism unit 10, and a main shaft 30 that is rotated by the electric mechanism unit 20 to operate the compression mechanism unit 10. The sealed container 1 is composed of a body 1a formed in a cylindrical shape extending in the vertical direction, an upper lid 1c that closes the upper opening of the body 1a, and a lower lid 1b that closes the lower opening of the body 1a. The sealed container 1 is provided with a refrigerant suction pipe 2 for introducing a refrigerant into the compression mechanism 10, and a refrigerant discharge pipe 3 for discharging the refrigerant compressed by the compression mechanism 10 to the outside of the sealed container 1. The compression mechanism 10 has a fixed scroll 11 and an orbiting scroll 12. The orbiting scroll 12 is driven to orbit by a main shaft 30. The electric mechanism 20 includes a stator 21 fixed to the sealed container 1, and a rotor 22 disposed inside the stator 21. A main shaft 30 is fixed to the rotor 22.

[0018] Below the fixed scroll 11 and the orbiting scroll 12, a main bearing 40 that supports the fixed scroll 11 and the orbiting scroll 12 is provided. The main bearing 40 is formed with a bearing portion 41 that supports the main shaft 30, a boss accommodating portion 42, a ring-shaped recess 43 for sealing, and a ring-shaped recess 45 for a rotation restraining member. The main bearing 40 is fixed to the sealed container 1 by welding or shrink fitting.

[0019] The fixed scroll 11 comprises a circular fixed scroll end plate 11a, a fixed spiral wrap 11b standing on the fixed scroll end plate 11a, and an outer peripheral wall portion 11c standing so as to surround the periphery of the fixed spiral wrap 11b, and a discharge port 14 is formed approximately in the center of the fixed scroll end plate 11a. The orbiting scroll 12 comprises a disk-shaped orbiting scroll end plate 12a, an orbiting spiral wrap 12b erected on the wrap side end surface of the orbiting scroll end plate 12a, and a cylindrical boss portion 12c formed on the opposite side from the wrap side end surface of the orbiting scroll end plate 12a. The fixed spiral wrap 11b of the fixed scroll 11 and the orbiting spiral wrap 12b of the orbiting scroll 12 are meshed with each other, and a plurality of compression chambers 15 are formed between the fixed spiral wrap 11b and the orbiting spiral wrap 12b. The boss portion 12c is formed at approximately the center of the orbiting scroll end plate 12a. The boss portion 12c is accommodated in the boss accommodating portion .

[0020] The main shaft 30 is formed with a journal portion 31 disposed in the bearing portion 41, an eccentric shaft 32 inserted into the boss portion 12c, and a main shaft oil supply hole 34 extending from a lower end portion 33 of the main shaft 30 to the eccentric shaft 32. The eccentric shaft 32 is formed at the upper end of the main shaft 30, and the journal portion 31 is formed below the eccentric shaft 32.

[0021] The fixed scroll 11 is fixed to the main bearing 40 at its outer circumferential wall portion 11c by using a plurality of bolts 16. On the other hand, the orbiting scroll 12 is supported by the fixed scroll 11 via a rotation restraining member 17 such as an Oldham ring. The rotation restraining member 17, which restrains the rotation of the orbiting scroll 12, is disposed in a ring-shaped recess 45 for the rotation restraining member, and is provided between the fixed scroll 11 and the main bearing 40. As a result, the orbiting scroll 12 orbits relative to the fixed scroll 11 without rotating on its own axis. A lower end 33 of the main shaft 30 is journalled on a sub-bearing 18 arranged in the lower part of the sealed container 1 .

[0022] The sealed container 1 has an oil reservoir 4 formed at its bottom for storing lubricating oil. A positive displacement oil pump 5 is provided at the lower end of the main shaft 30. The oil pump 5 is arranged so that its suction port is located inside the oil reservoir 4. The oil pump 5 is driven by the main shaft 30. The oil pump 5 can reliably suck up the lubricating oil in the oil reservoir 4 provided at the bottom of the sealed container 1 regardless of the pressure conditions or operating speed, eliminating concerns about running out of oil. The lubricating oil pumped up by the oil pump 5 is supplied through a main shaft oil supply hole 34 formed in the main shaft 30 to the bearing of the sub-bearing 18, the bearing portion 41, and the boss portion 12c.

[0023] The refrigerant sucked through the refrigerant suction pipe 2 is guided through the suction port 15a to the compression chamber 15. The compression chamber 15 moves from the outer periphery toward the center while reducing its volume, and when the refrigerant reaches a predetermined pressure in the compression chamber 15, it is discharged from the discharge port 14 provided in the center of the fixed scroll 11 to the discharge chamber 6. A discharge valve (not shown) is provided in the discharge port 14. When the refrigerant reaches a predetermined pressure in the compression chamber 15, it pushes open the discharge valve and is discharged into the discharge chamber 6. The refrigerant discharged into the discharge chamber 6 is led to the upper part of the sealed container 1, passes through a refrigerant passage (not shown) formed in the compression mechanism 10, reaches the periphery of the electric mechanism 20, and is discharged from the refrigerant discharge pipe 3.

[0024] In the scroll compressor of this embodiment, the boss accommodating portion 42 is a high-pressure region, and the outer periphery of the rotating scroll 12 where the rotation restraint member 17 is arranged is an intermediate pressure region, and the rotating scroll 12 is pressed against the fixed scroll 11 by the pressures of the high-pressure region and the intermediate pressure region. The eccentric shaft 32 is inserted into the boss portion 12c via a rotary bearing so as to be rotatable. An oil groove 38 (see FIG. 2) is formed on the outer circumferential surface of the eccentric shaft 32. The sealing ring-shaped recess 43 is formed on the thrust surface of the main bearing 40 that receives the thrust force of the orbiting scroll end plate 12a. A ring-shaped seal member is provided in the sealing ring-shaped recess 43. The seal member is disposed on the outer periphery of the boss accommodating portion 42. The sealed container 1 is filled with the same high-pressure refrigerant as the refrigerant discharged into the discharge chamber 6, and the main shaft oil supply hole 34 opens to the upper end of the eccentric shaft 32, so that the pressure inside the boss portion 12c becomes a high-pressure region equivalent to the pressure of the discharged refrigerant. The lubricating oil introduced into the boss portion 12c through the spindle oil supply hole 34 is supplied to the orbiting bearing and the boss accommodating portion 42 by an oil groove 38 formed on the outer circumferential surface of the eccentric shaft 32. A seal member is provided on the outer periphery of the boss accommodating portion 42, so the boss accommodating portion 42 is a high-pressure area.

[0025] FIG. 2 is a side view showing the main shaft of the scroll compressor shown in FIG. A vertical groove 35 of a predetermined length is formed in the journal portion 31 from the upper end of the journal portion 31. Also, a first oil supply hole 36 and a second oil supply hole 37 are formed in the journal portion 31, which communicate with the spindle oil supply hole 34 and open into the vertical groove 35. The first oil supply hole 36 and the second oil supply hole 37 are formed in the radial direction of the journal portion 31. The first oil supply hole 36 and the second oil supply hole 37 have the same hole diameter. A first opening 36 a of the first oil supply hole 36 is located on the lower end side of the vertical groove 35 , and a second opening 37 a of the second oil supply hole 37 is located on the upper end side of the vertical groove 35 . The second opening 37a is enlarged by a chamfered portion 37b (see FIG. 3). In this embodiment, the chamfered portion 37b is formed in a circular shape, but may be an ellipse or other shape. It is preferable that the chamfered portion 37b is enlarged in the vertical direction of the vertical groove 35 by a length approximately equal to the width of the vertical groove 35. The lubricating oil in the oil reservoir 4 is guided to the inner circumferential surface of the bearing 41 via the spindle oil supply hole 34 , the first oil supply hole 36 , and the second oil supply hole 37 .

[0026] In this way, since the longitudinal groove 35 reaches the upper end of the journal portion 31, the lubricating oil supplied to the longitudinal groove 35 is discharged from the upper end of the journal portion 31, and therefore a sufficient amount of lubricating oil is supplied to the longitudinal groove 35 from the first oil supply hole 36 and the second oil supply hole 37. Furthermore, since the first opening 36a of the first oil supply hole 36 is located on the lower end side of the longitudinal groove 35 and the second opening 37a of the second oil supply hole 37 is located on the upper end side of the longitudinal groove 35, the amount of lubricating oil supplied to the longitudinal groove 35 can be increased in a balanced manner, and damage to the upper end of the bearing can be reduced, refrigeration capacity and COP can be improved, and input can be reduced. In addition, by enlarging the second opening 37a with the chamfered portion 37b, it is possible to supply lubricating oil with high oil pressure (due to the centrifugal force caused by the rotation of the main shaft) discharged from the second oil supply hole over a wide area at the upper end of the bearing.

[0027] FIG. 3 is a cross-sectional view showing a bearing portion and a journal portion of the scroll compressor shown in FIG. An upper portion 41u of the bearing portion 41 is thicker than a lower portion 41d of the bearing portion 41. The first opening 36a is located in a lower portion 41d of the bearing portion 41, and the second opening 37a is located in an upper portion 41u of the bearing portion 41. In this way, by positioning the second opening 37a relative to the upper portion 41u (upper end portion of the bearing) of the bearing portion 41, which is a thick portion, damage to the thick portion, which is less likely to deform, can be reduced, the refrigeration capacity and COP can be improved, and input power can be reduced. A bush 41a (see FIG. 4) is disposed on the inner periphery of the bearing portion 41. A ring-shaped flexible groove 46 is formed in the upper end surface 41b of the bearing portion 41. By forming the flexible groove 46 in the upper portion 41u of the bearing portion 41, which is a thick portion, deformation can be easily caused.

[0028] FIG. 4 is a diagram showing a main bearing of the scroll compressor shown in FIG. FIG. 4(a) is a top view of the main bearing, FIG. 4(b) is a side sectional view of the main bearing, and FIG. 4(c) is an enlarged view of a main portion of FIG. 4(a). 4(b), where L is the overall length of the bearing portion 41 and D is the inside diameter of the bearing portion 41, L / D≦1. This embodiment is highly effective for a bearing portion 41 in which L / D≦1. 4(c), it is preferable to form a slit 44 extending from the upper end to the lower end on the inner circumferential surface of the bearing portion 41. By forming such a slit 44, when the longitudinal groove 35 passes through the slit 44 due to the rotation of the main shaft 30, the lubricating oil can be discharged from the slit 44, so that it is possible to supply oil to a portion of the journal portion 31 that does not have a longitudinal groove. In this embodiment, a bush 41a is disposed on the inner circumferential surface of the bearing portion 41, and the slit 44 is formed by the bush 41a.

[0029] FIG. 5 is a diagram showing the results of performance verification of the scroll compressor shown in FIG. Fig. 5(a) shows the cooling capacity, Fig. 5(b) shows the input, and Fig. 5(c) shows the COP. -1 , 60s -1 , 90s -1 The performance was compared as follows. The lower oil supply is a comparative example in which only the first oil supply hole 36 is provided, the upper oil supply is a comparative example in which only the second oil supply hole 37 is provided, and the two oil supply holes are the present embodiment in which the first oil supply hole 36 and the second oil supply hole 37 are provided, and the lower oil supply is compared with the comparative example in which only the first oil supply hole 36 is provided as 100%. As shown in Fig. 5(a), the cooling capacity increases at all rotation speeds, especially at the medium rotation speed (60s -1 , 90s -1 ) is highly effective. As shown in Fig. 5(b), the input is reduced at all rotation speeds, especially at low rotation speeds (30s -1 ) is highly effective. As shown in Fig. 5(c), the COP increased at all rotation speeds, especially at low rotation speeds (30s -1 ) is highly effective. In this way, 30s -1 Since the effect is high for rotation speeds below 30s, it is an inverter scroll compressor with variable rotation speed. -1 It is most suitable for compressors with the following rotation speeds in their operating range: [Industrial Applicability]

[0030] The scroll compressor of the present invention is useful for refrigeration cycle devices such as hot water heating devices, air conditioners, water heaters, and refrigerators. [Explanation of symbols]

[0031] 1. Airtight container 1a Torso 1b Lower lid 1c top lid 2 Refrigerant suction pipe 3 Refrigerant discharge pipe 4 Oil storage section 5. Oil pump 6 Discharge chamber 10 Compression mechanism 11 Fixed Scroll 11a Fixed scroll head plate 11b Fixed spiral wrap 11c Outer wall 12 Swivel Scroll 12a Rotating scroll head plate 12b Swirling Spiral Wrap 12c Boss part 14 Discharge port 15 Compression chamber 15a Intake port 16 Volts 17 Rotation restraint member 18 Sub-bearing 20 Electric mechanism section 21 Stator 22 Rotor 30 main axis 31 Journal Section 32 Eccentric shaft 33 Lower end 34 Spindle oil supply hole 35 Vertical groove 36 No. 1 oil hole 36a 1st opening 37 No. 2 oil hole 37a 2nd opening 37b Chamfered part 38 Oil groove 40 Main bearing 41 Bearing section 41a Bush 41b Upper end surface 41d Lower 41u Upper part (upper end of bearing) 42 Boss housing 43 Sealing ring recess 44 Slit 45 Ring-shaped recess for rotation restraint member 46 Flexible Groove

Claims

1. A compression mechanism that compresses a refrigerant, an electric mechanism that drives the compression mechanism, and a main shaft that is rotated by the electric mechanism to operate the compression mechanism are arranged in the sealed container, An oil reservoir is formed at the bottom of the sealed container, The compression mechanism includes a fixed scroll and an orbiting scroll, The fixed scroll includes a disk-shaped fixed scroll end plate and a fixed spiral wrap provided upright on the fixed scroll end plate, The orbiting scroll includes a disk-shaped orbiting scroll end plate, an orbiting spiral wrap provided on a wrap side end surface of the orbiting scroll end plate, and a boss portion formed on the opposite side of the wrap side end surface of the orbiting scroll end plate, the fixed spiral wrap and the orbiting spiral wrap are intermeshed with each other to form a plurality of compression chambers between the fixed spiral wrap and the orbiting spiral wrap; A main bearing for supporting the fixed scroll and the orbiting scroll is provided below the fixed scroll and the orbiting scroll, The main bearing is formed with a bearing portion that supports the main shaft and a boss accommodating portion that accommodates the boss portion, The main shaft is formed with a journal portion disposed in the bearing portion, an eccentric shaft inserted into the boss portion, and a main shaft oil supply hole extending from a lower end portion of the main shaft to the eccentric shaft, A scroll compressor in which lubricating oil in the oil reservoir is guided to the bearing section through the main shaft oil supply hole, A longitudinal groove having a predetermined length is formed on the journal portion from the upper end of the journal portion, a first oil supply hole and a second oil supply hole are formed in communication with the spindle oil supply hole and opening into the longitudinal groove; a first opening of the first oil supply hole is located on a lower end side of the longitudinal groove, a second opening of the second oil supply hole is located on an upper end side of the longitudinal groove, The longitudinal groove extends to the upper end of the journal portion, so that the lubricating oil supplied to the longitudinal groove is discharged from the upper end of the journal portion. A scroll compressor characterized by:

2. The second opening is enlarged by a chamfer.

2. The scroll compressor according to claim 1 .

3. An upper portion of the bearing portion is thicker than a lower portion of the bearing portion, the first opening is located in the lower portion of the bearing portion, The second opening is located at the upper portion of the bearing portion.

3. The scroll compressor according to claim 1 or 2.

4. A slit is formed on the inner peripheral surface of the bearing portion from the upper end to the lower end. The scroll compressor according to any one of claims 1 to 3.

5. A bush is disposed on the inner periphery of the bearing portion, and the slit is formed by the bush.

5. The scroll compressor according to claim 4.

6. A ring-shaped flexible groove is formed on the upper end surface of the bearing portion. The scroll compressor according to any one of claims 1 to 5.

7. Let L be the overall length of the bearing portion and D be the inside diameter of the bearing portion, and L / D≦1. The scroll compressor according to any one of claims 1 to 6.

8. 30s －１ The following rotation speeds are included in the operating range: The scroll compressor according to any one of claims 1 to 7.

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