JP4848202B2 - Scroll compressor - Google Patents

Description

  The present invention relates to a scroll compressor, and more particularly to a scroll compressor that is suitable for use in an in-vehicle air conditioner or the like.

  In a general scroll compressor, a fixed scroll in which a spiral wall is provided on one side of an end plate in a housing, and a spiral having substantially the same shape as the fixed scroll wall on one side of the end plate. Are housed in combination with orbiting scrolls having a wall-like structure standing upright. In this state, the orbiting scroll revolves with respect to the fixed scroll, thereby gradually reducing the volume of the compression chamber formed between the walls and compressing the fluid in the compression chamber.

  In such a scroll compressor, a gas containing mist-like lubricating oil is sucked into the suction chamber, and the fluid gas is compressed by the compression mechanism and sent to the discharge chamber. Lubricating oil is separated from the gas and collected in the lower part. In some cases, the lubricating oil accumulated in the discharge chamber is returned to the suction chamber through a lubricating oil passage formed in a partition member that partitions the suction chamber using a pressure difference as a driving force. However, in such a scroll compressor, it is necessary to provide an oil separation cylinder having a predetermined volume in order to separate the fluid gas and the lubricating oil, and there is a problem that the apparatus becomes large. In order to solve such a problem, there is another conventional scroll compressor in which lubricating oil is directly supplied from a compression chamber to a portion to be lubricated through an oil supply passage. In such a scroll compressor, when a gas containing lubricating oil is compressed in the compression chamber, the lubricating oil adheres to the compression chamber. Since this lubricating oil is supplied directly to the portion to be lubricated via the oil supply passage formed in the end plate of the orbiting scroll, it is not necessary to provide the oil separation cylinder described above. Thereby, size reduction and weight reduction of the scroll compressor were able to be achieved (for example, patent document 1).

JP-A-10-141256

  However, in the scroll compressor described in Patent Document 1 described above, the lubricating oil is supplied to the eccentric portion, but in consideration of the efficiency of the scroll compressor and the like, the other sliding portions in the housing are also surely secured. It is more preferable to supply lubricating oil, and further improvement in lubricity is desired in order to increase the reliability of the scroll compressor.

  Therefore, an object of the present invention is to provide a scroll compressor that always secures a sufficient amount of lubricating oil and has improved performance and reliability.

  In order to achieve the above object, a scroll compressor according to a first aspect of the present invention includes a housing having a hollow inside and an end plate on which a spiral wall body is erected, and is fixed to the housing. The housing includes a fixed scroll provided and an end plate on which a spiral wall body is erected, and the wall body is engaged with the wall body of the fixed scroll and is capable of revolving while being prevented from rotating. A revolving scroll supported within, a suction chamber for introducing a fluid containing lubricating oil, and a compression for compressing the fluid introduced into the suction chamber by revolving orbiting the revolving scroll with respect to the fixed scroll A chamber and a housing are rotatably supported by a bearing portion, and an eccentric portion formed at one end portion is engaged with the orbiting scroll via an engaging portion, and a rotational force is transmitted to the orbiting scroll. A shaft, a mechanical chamber in which the bearing portion and the engaging portion are defined in the housing, a first oil supply passage for introducing the lubricating oil remaining in the compression chamber into the mechanical chamber, and an introduction into the mechanical chamber Leakage suppression means for suppressing leakage of the lubricating oil, and a discharge passage for discharging the fluid in the mechanical chamber to the suction chamber side, the cross-sectional area of the discharge passage being the cross-sectional area of the first oil supply passage Or larger than the cross-sectional area.

  In the scroll compressor according to a second aspect of the present invention, the leakage suppression means includes a thrust bearing that thrust-supports the back surface of the end plate of the orbiting scroll in contact with the wall surface of the housing.

  According to a third aspect of the present invention, the scroll compressor includes a balance weight connected to the mechanical chamber so as to rotate together with the drive shaft, and the discharge passage has an opening on the mechanical chamber side of the balance weight. It is formed above the lowest end position in

  In the scroll compressor according to the invention according to claim 4, the bearing portion includes a first bearing portion that supports one end portion of the drive shaft and a second bearing portion that supports the other end, and the mechanism. In the chamber, the first bearing portion is defined, and a lip seal is provided adjacent to the second bearing portion to seal between the housing and the drive shaft. A seal chamber defined by the lip seal, and a second oil supply passage that communicates the mechanical chamber and the seal chamber and introduces the lubricating oil into the seal chamber.

  In a scroll compressor according to a fifth aspect of the present invention, the second oil supply passage is a groove formed on the inner periphery of the housing.

  In the scroll compressor according to the invention of claim 6, the second oil supply passage is formed in the drive shaft, and the opening on the seal chamber side is more open than the opening on the mechanical chamber side with respect to the rotation axis of the drive shaft. Is also formed on the radially outer peripheral side.

  According to the scroll compressor according to the first aspect of the present invention, the housing having a hollow inside, and the fixed scroll having the end plate on which the spiral wall body is erected and fixed to the housing are provided. The orbiting scroll has an end plate on which a spiral wall body is erected, and is supported in the housing so as to be able to revolve while preventing rotation while the wall body is engaged with the wall body of the fixed scroll. And a suction chamber for introducing a fluid containing lubricating oil, a revolving scroll of the orbiting scroll with respect to the fixed scroll, a compression chamber for compressing the fluid introduced into the suction chamber, and a housing that can be rotated by a bearing portion. And an eccentric portion formed at one end of the shaft is engaged with the orbiting scroll through the engaging portion, and transmits the rotational force to the orbiting scroll, and the bearing portion and the engagement within the housing. Part And the mechanical chamber which is bounded, a first oil supply passage of the lubricant remaining in the compression chamber is introduced into the mechanical chamber is provided for suppressing leakage suppression means the leakage of the lubricating oil introduced into the mechanical chamber.

  Accordingly, the drive shaft is rotatably supported by the bearing portion on the housing, the eccentric portion is engaged with the orbiting scroll via the engaging portion, and the rotational force is transmitted to the orbiting scroll, and the compression chamber is a fixed scroll. On the other hand, the orbiting scroll revolves to compress the fluid introduced from the suction chamber. At this time, the lubricating oil contained in the fluid is separated from the fluid. The first oil supply passage introduces the lubricating oil remaining in the compression chamber into the mechanical chamber described above, and the leakage suppression means suppresses leakage of the lubricating oil stored in the mechanical chamber. Therefore, the mechanical chamber can sufficiently secure the introduced lubricating oil in the interior, and the bearing portion and the engaging portion can be lubricated by the stored lubricating oil. It is possible to provide a scroll compressor that secures the lubricant oil and has improved performance and reliability.

  According to the scroll compressor according to the second aspect of the present invention, the leakage suppression means has a thrust bearing that thrust-supports the back surface of the end plate of the orbiting scroll in contact with the wall surface of the housing. Therefore, the thrust bearing supports the orbiting scroll rotatably by maintaining the back surface of the end plate of the orbiting scroll and the wall surface of the housing in contact with each other, and the lubricating oil stored in the mechanical chamber on the thrust surface. Since the leakage is suppressed, it is possible to provide a scroll compressor that always secures a sufficient amount of lubricating oil without increasing the number of parts and improves performance and reliability.

  According to the scroll compressor according to the first aspect of the present invention, the discharge compressor includes the discharge passage, and the discharge passage discharges the fluid in the mechanical chamber to the suction chamber side. Therefore, since the pressure increase in the mechanical chamber is suppressed, the lubricating oil can be stably introduced into the mechanical chamber for a long time via the first oil supply passage, so that sufficient lubricating oil is always secured in the mechanical chamber. can do.

  According to the scroll compressor according to the first aspect of the present invention, the cross-sectional area of the discharge passage is equal to or larger than the cross-sectional area of the first oil supply passage. By doing so, although the pressure in the mechanical chamber is slightly higher than the pressure in the suction chamber, it can be made as equal as possible.

  According to the scroll compressor according to the invention of claim 3, the mechanical chamber is provided with the balance weight connected to the drive shaft so as to be integrally rotatable with the drive shaft, the drive shaft is provided along the horizontal direction, and the discharge passage is provided in the mechanical chamber. The opening on the side is formed above the lowest end position on the balance locus rotation locus. Therefore, when the drive shaft rotates, the balance weight rotates in the space in the mechanical chamber together with the drive shaft, scoops up the lubricating oil in the rotation range of the balance weight, and evenly spreads in the mechanical chamber. Since the opening on the mechanical chamber side of the discharge passage is formed above the lowest end position in the balance locus rotation locus, the lubricating oil is always stored so as to cover the rotation range of the balance weight. Therefore, a sufficient amount of lubricating oil can always be secured in the mechanical chamber.

  According to the scroll compressor of the invention according to claim 4, the bearing portion includes a first bearing portion that supports one end portion of the drive shaft and a second bearing portion that supports the other end, and a mechanical chamber. Includes a lip seal that seals between the housing and the drive shaft, and is partitioned by the lip seal within the housing. And a second oil supply passage for introducing lubricating oil into the seal chamber. Therefore, the lip seal suppresses fluid leakage to the outside of the housing and is slid by the drive shaft as the drive shaft rotates. The second oil supply passage introduces the lubricating oil stored in the mechanical chamber into the seal chamber, and the sealing chamber stores the lubricating oil introduced therein, and the stored lubricating oil causes the drive shaft of the lip seal to Since the contact portion is lubricated, the reliability of the lip seal can be improved.

  According to the scroll compressor of the invention according to claim 5, the second oil supply passage is a groove formed in the inner periphery of the housing. Accordingly, since the lubricating oil is introduced into the seal chamber along the housing, the lubricating oil can be introduced into the seal chamber through a passage with less resistance, and the efficiency of introducing the lubricating oil into the seal chamber is improved. Sufficient lubricating oil can be secured in the seal chamber. Further, the second oil supply passage can be formed by a relatively simple process of forming a groove in the housing, and the manufacturing efficiency can be improved.

  According to the scroll compressor of the invention according to claim 6, the second oil supply passage is formed in the drive shaft. Further, in the second oil supply passage, the opening on the seal chamber side is formed on the outer peripheral side in the radial direction relative to the opening on the mechanical chamber side with respect to the rotation axis of the drive shaft. Therefore, since the second oil supply passage introduces the lubricating oil into the seal chamber along the drive shaft, the lubricating oil can be introduced into the seal chamber through the passage with less resistance, and the lubricating oil to the seal chamber can be introduced. Therefore, sufficient lubricating oil can be secured in the seal chamber. Further, the second oil supply passage rotates with the rotation of the drive shaft. Therefore, the lubricating oil that has entered the second oil supply passage from the opening on the mechanical chamber side is easily led out from the opening on the sealing chamber side by centrifugal force, so that the efficiency of introducing the lubricating oil into the sealing chamber is further improved.

Below, the reference example and Example of the scroll compressor which concern on this invention are demonstrated in detail based on drawing. In addition, this invention is not limited by this reference example and Example. In addition, constituent elements in the following reference examples and examples include those that can be easily replaced by those skilled in the art or those that are substantially the same.

[Reference example]
FIG. 1 is a cross-sectional view of a scroll compressor 1 according to a reference example of the present invention. The scroll compressor 1 shown in the figure is a scroll compressor suitable for use in an in-vehicle air conditioner or the like, and refrigerant gas is used as a fluid. The scroll compressor 1 includes a housing 11 having a hollow inside, a fixed scroll 14 that is fixedly installed inside the housing 11, and a turning scroll 15 that is supported in the housing 11 so as to be capable of revolution while being prevented from rotating. Prepare.

  The fixed scroll 14 has an end plate 44 on which a spiral wrap 45 as a spiral wall body is erected. The orbiting scroll 15 has an end plate 50 on which a spiral wrap 51 as a spiral wall body is erected, and can be revolved while the spiral wrap 51 is engaged with the spiral wrap 45 of the fixed scroll 14. Supported. The fixed scroll 14 and the orbiting scroll 15 constitute a compression unit 12 described later.

  The scroll compressor 1 includes a drive device 13 that drives the orbiting scroll 15. The orbiting scroll 15 and the drive device 13 are connected by a drive shaft 16 that transmits rotational force to the orbiting scroll 15, and the orbiting scroll 15 can be driven by the drive device 13. The drive shaft 16 is rotatably supported by the housing 11 by a bearing portion, and an eccentric portion 60 formed at one end portion is engaged with the orbiting scroll 15 via the engaging portion.

  The scroll compressor 1 further includes a suction chamber 39 for introducing a refrigerant gas containing lubricating oil, and a compression chamber 40 for compressing the refrigerant gas introduced into the suction chamber 39. The compression chamber 40 compresses the refrigerant gas when the orbiting scroll 15 revolves around the fixed scroll 14.

  The housing 11 is disposed horizontally and is configured as a sealed container having a substantially cylindrical shape surrounding each part of the scroll compressor. The housing 11 includes a center housing 21 and a lid-shaped housing 22 disposed adjacent to the center housing 21. The center housing 21 is formed in a substantially cylindrical shape, and the lid-shaped housing 22 is formed in a substantially cylindrical shape with one end closed. The lid-shaped housing 22 is fixed to the center housing 21 with a plurality of fastening bolts 23 in a state where the open end is fitted to the center housing 21. In the housing 11, a suction port 26 is formed in the center housing 21, and a discharge port 27 is formed in the lid-shaped housing 22. The suction port 26 and the discharge port 27 are connected to a refrigerant gas path (not shown) outside the scroll compressor 1.

  The center housing 21 is formed with a ring-shaped support portion 28 at the opposite end of the lid-shaped housing 22. The drive shaft 16 is provided in the housing 11 in a direction and position where the central axis that is the center of rotation substantially coincides with the central axis of the center housing 21. A lip seal 31 that seals the gap between the center housing 21 and the drive shaft 16 and suppresses leakage of the refrigerant gas to the outside of the housing 11 is attached to the inner peripheral portion of the center housing 21. Further, a rolling bearing 30 as a first bearing portion and a ball bearing 29 as a second bearing portion are mounted on the inner peripheral portion of the center housing 21. The ball bearing 29 is provided so as to be adjacent to the lip seal 31 and rotatably supports the drive shaft 16 as a rotation shaft at a short portion outside the lip seal 31. The rolling bearing 30 rotatably supports the large-diameter portion 16a (end portion on the eccentric portion 60 side) of the drive shaft 16 inside the lip seal 31. The ball bearing 29 and the rolling bearing 30 provided between the center housing 21 and the drive shaft 16 constitute a bearing portion of the present invention that rotatably supports the drive shaft 16 on the housing 11.

  The drive device 13 is provided at the end of the drive shaft 16 opposite to the lid-shaped housing 22. A rotating plate 32 is fixed to this end portion of the drive shaft 16 by a connecting bolt 33. A ring-shaped support ring 34 is connected to the outer peripheral portion of the rotating plate 32 by a plurality of connecting pins 35. Then, the end surface of the driven pulley 36 is fixed to the support ring 34 and is rotatably supported by the support portion 28 of the center housing 21 via the bearing 37. A magnet clutch is configured by mounting an electromagnet 38 in the driven pulley 36. The driven pulley 36 is connected to a drive source (for example, an engine) via a drive belt (not shown).

  The drive shaft 16 is formed with an eccentric portion 60 at the end opposite to the drive device 13 side. The eccentric part 60 is configured by an eccentric drive pin 54 and a drive bush 55. The eccentric drive pin 54 is formed in a substantially cylindrical shape. Further, the eccentric drive pin 54 is positioned so that the center axis of the eccentric drive pin 54 and the center axis of the drive shaft 16 are parallel, and the center axis of the eccentric drive pin 54 is separated from the center axis of the drive shaft 16 by a predetermined amount. To be provided. Therefore, the eccentric drive pin 54 is eccentric by a predetermined amount with respect to the central axis that is the center of rotation of the drive shaft 16. The drive bush 55 is fitted to the eccentric drive pin 54 so as to cover the outer peripheral side of the eccentric drive pin 54. The drive shaft 16 is connected to a balance weight 58 for canceling the unbalance amount given to the orbiting scroll 15 by the revolving orbiting motion.

  Furthermore, the compression part 12 mentioned above is provided in the lid-shaped housing 22 side of the eccentric part 60. FIG. The compression unit 12 is installed in the center housing 21. The compression unit 12 is provided so that the orbiting scroll 15 is positioned on the eccentric portion 60 side and the fixed scroll 14 is positioned on the lid-shaped housing 22 side.

  The orbiting scroll 15 is disposed such that an end plate 50 formed in a substantially disk shape faces the eccentric portion 60. The spiral wrap 51 is erected on the surface of the end plate 50 on the fixed scroll 14 side (surface opposite to the surface facing the eccentric portion 60). The orbiting scroll 15 is thrust supported by a thrust bearing 61 so that the end plate 50 can rotate. Further, the orbiting scroll 15 is formed with a boss portion 53 for engaging the eccentric portion 60 substantially at the center of the surface where the end plate 50 faces the eccentric portion 60.

  The boss portion 53 is formed so as to protrude toward the eccentric portion 60 side. The boss portion 53 is formed in a substantially cylindrical shape having a hollow inside. A rolling bearing 56 is provided inside the boss portion 53. The eccentric part 60 is engaged with the orbiting scroll 15 via the rolling bearing 56. The rolling bearing 56 provided between the boss portion 53 and the eccentric portion 60 constitutes an engaging portion of the present invention in which the eccentric portion 60 is engaged with the orbiting scroll 15. The eccentric drive pin 54 is rotatably supported by the boss portion 53 via a drive bush 55 and a rolling bearing 56. As a result, the orbiting scroll 15 can revolve by the rotation of the drive shaft 16. Further, an anti-rotation mechanism 57 is interposed between the center housing 21 and the orbiting scroll 15, and the orbiting scroll 15 is revolved with the center axis of the drive shaft 16 as the revolution axis while being prevented from rotating by these structures. It can be swiveled.

  The fixed scroll 14 is provided by being fitted to the inner peripheral surface of the lid-shaped housing 22 in a state where the spiral wrap 45 is engaged with the spiral wrap 51 of the orbiting scroll 15. In the fixed scroll 14, the end plate 44 is fixed to the lid-shaped housing 22 by the fastening bolt 23 described above.

  The fixed scroll 14 and the orbiting scroll 15 are combined so that the spiral wrap 45 of the fixed scroll 14 and the spiral wrap 51 of the orbiting scroll 15 are engaged with each other, thereby forming a compression chamber 40 between the wraps 45 and 51. . A suction chamber 39 is formed between the compression section 12 constituted by the fixed scroll 14, the orbiting scroll 15, and the compression chamber 40 and the center housing 21. Further, on the opposite side of the fixed scroll 14 from the spiral wrap 45, a discharge chamber 41 is defined by the end plate 44 and the inner peripheral surface of the lid-shaped housing 22.

  The suction port 26 described above opens to a suction chamber 39 as a low pressure portion, and the discharge port 27 opens to a discharge chamber 41 as a high pressure portion. The suction chamber 39 introduces refrigerant gas containing lubricating oil into the compression chamber 40. The compression chamber 40 compresses the refrigerant gas inside as the orbiting scroll 15 revolves around the fixed scroll 14. The high-pressure refrigerant gas compressed in the compression chamber 40 is discharged into the discharge chamber 41. A discharge port 46 that communicates the compression chamber 40 and the discharge chamber 41 is provided at the center of the end plate 44 of the fixed scroll 14, and the discharge port 46 can be opened and closed by a discharge valve 47.

  The reason why the suction port 26 is opened so as to be substantially opposite to the compression portion 12 is that the refrigerant gas taken into the housing 11 from the suction port 26 is directly introduced into the compression chamber, thereby reducing the compression efficiency and pressure loss. This is to suppress an increase in the amount of. The refrigerant gas compressed in the compression chamber 40 contains a lubricating oil that lubricates each part in the housing 11 of the scroll compressor 1 in a mist state. Each sliding part is lubricated.

  The scroll compressor 1 is further defined by a mechanical chamber 80 in which a rolling bearing 30 as a first bearing portion and a rolling bearing 56 as an engaging portion are defined in the housing 11 and a lip seal 31 in the housing 11. A sealing chamber 81. The mechanical chamber 80 is a space defined by the inner peripheral surface of the center housing 21, the end plate 50 of the orbiting scroll 15, and the end surface of the large-diameter portion 16 a of the drive shaft 16. The seal chamber 81 is defined by the inner peripheral surface of the center housing 21, the end surface of the large-diameter portion 16 a of the drive shaft 16 (end surface opposite to the mechanical chamber 80), and the surface of the lip seal 31 on the large-diameter portion 16 a side. It is a space that is separated from the mechanical chamber 80 by the rolling bearing 30 and the large-diameter portion 16 a of the drive shaft 16.

  The scroll compressor 1 further includes a first oil supply passage 83 for introducing into the mechanical chamber 80 lubricating oil that is separated from the refrigerant gas in the compression chamber 40 and remains on the inner surface when the refrigerant gas is compressed. , And a leakage suppression means for suppressing leakage of the lubricating oil introduced into the mechanical chamber 80 via the first oil supply passage 83. The first oil supply passage 83 is provided in the end plate 50 of the orbiting scroll 15 so as to communicate the compression chamber 40 and the mechanical chamber 80. Here, the leakage suppression means is the thrust bearing described above that thrust-supports the back surface of the end plate 50 of the orbiting scroll 15 (the surface opposite to the surface on which the spiral wrap 51 is erected) in contact with the wall surface of the housing. 61. The thrust bearing 61 forms a wall surface portion that is substantially parallel to the radial direction of the center housing 21. The orbiting scroll 15 is provided so as to be in contact with the wall surface of the end plate 50. The thrust surface of the thrust bearing 61 is coated with a fluororesin having a low coefficient of friction and excellent wear resistance. The thrust bearing 61 as a leakage suppressing means seals the suction chamber 39 and the mechanical chamber 80, which are low pressure portions, by supporting the back surface of the end plate 50 opposite to the thrust surface in a contact state with no gap therebetween. The lubricating oil introduced into 80 is prevented from leaking to the suction chamber 39 side. The lubricating oil introduced and stored in the mechanical chamber 80 is also introduced and stored in the seal chamber through the gap between the rolling bearing 30 and the drive shaft 16.

Next, with reference to FIG. 1, the effect | action of the scroll compressor 1 which concerns on the reference example of this invention is demonstrated. When the driving source is driven, the driving force is transmitted to the driven pulley 36 of the driving device 13, the driving shaft 16 rotates, and this rotational force is transmitted to the orbiting scroll 15 via the eccentric portion 60 and the like. While the rotation prevention mechanism 57 prevents the rotation, it turns on the revolution track. Then, refrigerant gas containing mist of lubricating oil is sucked into the suction chamber 39 in the housing 11 from the suction port 26 and introduced into the compression chamber 40.

  As the orbiting scroll 15 continues to rotate, the compression chamber 40 is gradually narrowed accordingly, and the refrigerant gas inside reaches the center while being compressed, and is discharged to the discharge chamber 41 through the discharge port 46. The discharge valve 47 opens and closes due to the differential pressure between the compression chamber 40 and the discharge chamber 41. That is, when the pressure of the refrigerant gas in the compression chamber 40 becomes higher than the pressure in the discharge chamber 41, the discharge valve 47 is pushed open and the high-pressure refrigerant gas flows out into the discharge chamber 41. Thereafter, the high-pressure refrigerant gas is discharged from the discharge chamber 41 through the discharge port 27 to the outside.

  At this time, the refrigerant gas containing mist-like lubricating oil is introduced into the compression chamber 40, and the orbiting scroll 15 is rotated and the volume of the compression chamber 40 is gradually reduced. Mist lubricating oil is separated from the refrigerant gas. The separated lubricating oil is collected by the meshing portion when the orbiting scroll 15 rotates with respect to the fixed scroll 14, and is introduced into the mechanical chamber 80 through the first oil supply passage 83 by the pressure of the compression chamber 40. The The introduced lubricating oil is stored inside the mechanical chamber 80, and further introduced into the seal chamber 81 through the gap between the rolling bearing 30 and the drive shaft 16 and stored.

  Lubricating oil stored in the mechanical chamber 80 leaks into the suction chamber 39, which is a low-pressure portion, because the suction chamber 39 and the mechanical chamber 80 are sealed by the thrust surface of the thrust bearing 61 and the end plate 50. Is suppressed. Therefore, a sufficient amount of lubricating oil is secured in the mechanical chamber 80 and the seal chamber 81. The sufficient amount of lubricating oil is applied to the rolling bearing 30 as a bearing section partitioned in the mechanical chamber 80, the large diameter portion 16a of the drive shaft 16, the rolling bearing 56 as an engaging portion, the eccentric drive pin 54, The drive bush 55 and the lip seal 31 that partitions the seal chamber 81 are reliably lubricated.

According to the scroll compressor 1 according to the reference example of the present invention described above, the housing 11 having a hollow inside, the fixed scroll 14 fixedly provided inside the housing 11, and the revolution can be swung while being prevented from rotating. A revolving scroll 15 supported in the housing 11, a suction chamber 39 for introducing a refrigerant gas containing lubricating oil, a compression chamber 40 for compressing the refrigerant gas introduced into the suction chamber 39, and a bearing portion in the housing 11. And an eccentric portion 60 formed at one end is engaged with the orbiting scroll 15 via a rolling bearing 56 as an engaging portion, and the rotational force is transmitted to the orbiting scroll. Drive shaft 16, a mechanical chamber 80 in which a rolling bearing 30 as a bearing portion and a rolling bearing 56 as an engaging portion are defined in the housing 11, and a compression chamber 40. A first oil supply passage 83 for introducing lubricating oil remaining to mechanical chamber 80 is provided with a thrust bearing 61 for suppressing leakage suppressing means the leakage of the lubricating oil to be introduced into the mechanical chamber 80.

  Therefore, the drive shaft 16 is rotatably supported by the housing 11 by the rolling bearing 30 as the bearing portion, and the eccentric portion 60 is engaged with the orbiting scroll 15 via the rolling bearing 56 as the engaging portion, and the rotational force is increased. This is transmitted to the orbiting scroll 15, and the compression chamber 40 compresses the refrigerant gas introduced from the suction chamber 39 when the orbiting scroll 15 revolves around the fixed scroll 14. At this time, the lubricating oil contained in the refrigerant gas is separated from the refrigerant gas. The first oil supply passage 83 introduces the lubricating oil remaining in the compression chamber 40 into the mechanical chamber 80 described above, and the thrust bearing 61 as the leakage suppressing means suppresses leakage of the lubricating oil stored in the mechanical chamber 80. To do. Therefore, the mechanical chamber 80 can sufficiently secure the lubricating oil introduced therein, and the rolling bearing 30 as the bearing portion and the rolling bearing 56 as the engaging portion can be secured by the stored lubricating oil. Since the lubrication can be achieved and the reliability of the bearing portion and the engagement portion is improved, it is possible to provide a scroll compressor that always secures a sufficient amount of lubricating oil and has improved performance and reliability.

Furthermore, according to the scroll compressor 1 according to the reference example of the present invention described above, the lip seal 31 that seals between the housing 11 and the drive shaft 16, the rolling bearing 30, and the large diameter portion of the drive shaft 16. 16a is provided with a seal chamber 81 separated from the mechanical chamber 80 and adjacent thereto. The lip seal 31 suppresses leakage of the refrigerant gas to the outside of the housing 11. The seal chamber 81 is partitioned by the lip seal 31 in the housing 11. The lip seal 11 is slid by the drive shaft 16 as the drive shaft 16 rotates. The lubricating oil introduced and stored in the mechanical chamber 80 described above is also introduced into the seal chamber 81 through the gap between the rolling bearing 30 and the drive shaft 16 and stored there. The contact portion of the lip seal 31 with the drive shaft 16 is lubricated by the stored lubricating oil. Therefore, the reliability of the lip seal 31 can be improved.

Furthermore, according to the scroll compressor 1 according to the reference example of the present invention described above, the leakage suppression means includes a thrust bearing 61 that thrust-supports the back surface of the end plate 50 of the orbiting scroll 15 in contact with the wall surface of the housing 11. Have Accordingly, the thrust bearing 61 maintains the back surface of the end plate 50 of the orbiting scroll 15 and the wall surface of the housing 11 in contact with each other, thereby supporting the orbiting scroll 15 so as to be rotatable, and in the mechanical chamber 81 on the thrust surface. Since leakage of stored lubricating oil is suppressed, it is possible to provide a scroll compressor in which a sufficient amount of lubricating oil is always ensured without increasing the number of parts, and performance and reliability are improved.

In addition, the scroll compressor 1 which concerns on the reference example of this invention mentioned above is not limited to the reference example mentioned above, A various change is possible. In the above description, the thrust surface of the thrust bearing 61 as the leakage suppressing means has been described as being coated with fluororesin, but is not limited thereto. Further, the leakage suppressing means has been described as being the thrust bearing 61, but a plate may be simply used as long as it is a means for suppressing leakage of the lubricating oil introduced into the mechanical chamber 80.

[Example 1]
FIG. 2 is a cross-sectional view of the scroll compressor 201 according to the first embodiment of the present invention. Scroll compressor 201 according to the first embodiment has substantially the same structure as the scroll compressor 1 according to the reference example differs from the scroll compressor 1 according to a reference example in that a discharge passage 284. In addition, about the structure, operation | movement, and effect which are common in a reference example , while overlapping description is abbreviate | omitted as much as possible, the same code | symbol is attached | subjected.

  The scroll compressor 201 further includes a discharge passage 284 that discharges the refrigerant gas in the mechanical chamber 80 to the suction chamber 39 side. The discharge passage 284 is formed in the center housing 21 in a groove shape. The discharge passage 284 is provided on the thrust surface of the thrust bearing 61 that forms part of the center housing 21, and is defined as a passage when the end plate 50 abuts against this thrust surface. The discharge passage 284 is provided so as to communicate the mechanical chamber 80 and the suction chamber 39. Further, the radial cross-sectional area of the discharge passage 284 is formed larger than the radial cross-sectional area of the first oil supply passage 83.

FIG. 3 is a cross-sectional view of the center housing 21 of the scroll compressor 201 according to the first embodiment of the present invention. This figure is a cross-sectional view of the thrust surface of the thrust bearing 61. Here, the balance weight 58 described above also in FIG. 1 is provided in the mechanical chamber 80 connected to the drive shaft 16. The balance weight 58 is disposed so as to be rotatable together with the drive shaft 16, and cancels centrifugal force caused by the turning motion of the orbiting scroll 15. The balance weight 58 rotates together with the drive shaft 16 in the mechanical chamber 80 when the drive shaft 16 rotates.

  The discharge passage 284 described above is installed when the entire scroll compressor 201 is installed so that the central axis of the drive shaft 16 is substantially horizontal, and the opening on the mechanical chamber 80 side is more than the lowermost position in the rotation locus of the balance weight 58. It is formed on the upper side. That is, an opening on the mechanical chamber 80 side is formed on the upper side in the vertical direction with respect to the line indicated by the one-point difference line in the drawing.

  The discharge passage 284 discharges the refrigerant gas that flows when the lubricating oil is introduced into the mechanical chamber 80 to the suction chamber 39 side, which is a low-pressure portion. Thereby, the pressure rise in the mechanical chamber 80 is suppressed. Therefore, the inside of the mechanical chamber 80 can be maintained at a low pressure relative to the compression chamber 40, and the lubricating oil can be stably introduced into the mechanical chamber 80 through the first oil supply passage 83 for a long time. Further, since the radial cross-sectional area of the discharge passage 284 is formed larger than the radial cross-sectional area of the first oil supply passage 83, the pressure in the mechanical chamber 80 is made substantially equal to the pressure in the suction chamber 39. be able to. Further, when the drive shaft 16 rotates, the balance weight 58 rotates together with the drive shaft 16 in the space in the mechanical chamber 80, and the lubricating oil in the rotation range of the balance weight 58 is lifted up, so that the balance weight 58 is uniformly distributed in the mechanical chamber 80. Scatter. Further, since the opening on the mechanical chamber 80 side of the discharge passage 284 is formed above the lowermost position in the rotation trajectory of the balance weight 58, the balance weight 58 is always maintained even when the scroll compressor 201 is stopped. The lubricating oil can be stored so as to be within the rotation range.

According to the scroll compressor 201 according to the first embodiment of the present invention described above, the discharge passage 284 is provided, and the discharge passage 284 discharges the refrigerant gas in the mechanical chamber 80 to the suction chamber 39 side which is a low pressure portion. To do. Thereby, the pressure rise in the mechanical chamber is suppressed, and the inside of the mechanical chamber 80 can be maintained at a low pressure relative to the compression chamber 40. Therefore, the lubricating oil can be stably introduced into the mechanical chamber 80 through the first oil supply passage 83 for a long time, and sufficient lubricating oil can always be secured in the mechanical chamber 80. Further, since the radial cross-sectional area of the discharge passage 284 is formed larger than the radial cross-sectional area of the first oil supply passage 83, the pressure in the mechanical chamber 80 is set to the pressure in the suction chamber 39 which is a low-pressure portion. However, it can be made as high as possible although it is slightly higher.

Furthermore, according to the scroll compressor 201 according to the first embodiment of the present invention described above, the balance weight 58 is provided in the mechanical chamber 80 so as to be integrally rotatable with the drive shaft 16. In the discharge passage 284, the opening on the mechanical chamber 80 side is formed above the lowest end position in the rotation locus of the balance weight 58. When the drive shaft 16 rotates, the balance weight 58 rotates in the space in the mechanical chamber 80, and the lubricating oil in the rotation range of the balance weight 58 is lifted up and spread evenly in the mechanical chamber 80. Since the opening on the mechanical chamber 80 side of the discharge passage 284 is formed at the position described above, the lubricating oil is always applied to the rotation range of the balance weight 58 even when the scroll compressor 201 is stopped. Stored. Therefore, a sufficient amount of lubricating oil can always be secured in the mechanical chamber 80.

In addition, the scroll compressor 201 which concerns on Example 1 of this invention mentioned above is not limited to the Example mentioned above, A various change is possible in the range described in the claim. In the above description, the discharge passage 284 is described as communicating between the mechanical chamber 80 and the suction chamber 39, but is configured to communicate a refrigerant gas path (not shown) connected to the mechanical chamber 80 and the suction port 26. May be. Further, although the balance weight 58 is illustrated integrally with the drive bush 55, it may be formed separately. Further, although the radial cross-sectional area of the discharge passage 284 has been described as being formed larger than the radial cross-sectional area of the first oil supply passage 83, the radial cross-sectional area of the first oil supply passage 83 is You may form in equal magnitude | size.

[Example 2]
FIG. 4 is a cross-sectional view of the scroll compressor 301 according to the second embodiment of the present invention. The scroll compressor 301 according to the second embodiment has substantially the same configuration as the scroll compressor 201 according to the first embodiment, but the second embodiment is provided with a second oil supply passage 385 formed in the housing 11. This is different from the scroll compressor 201 according to the above. In addition, about the structure, effect | action, and effect which are common in Example 1 , while overlapping description is abbreviate | omitted as much as possible, the same code | symbol is attached | subjected.

  The second oil supply passage 385 is formed to communicate the mechanical chamber 80 and the seal chamber 81. The second oil supply passage 385 is formed in a groove shape on the inner peripheral surface of the center housing 21. The second oil supply passage 385 introduces the lubricating oil stored in the mechanical chamber 80 into the seal chamber 81 where the lip seal 31 is defined. The introduction of the lubricating oil from the mechanical chamber 80 to the seal chamber 81 is also performed through the gap between the rolling bearing 30 and the drive shaft 16, but by introducing the lubricating oil through the second oil supply passage 385, Since the resistance when the lubricating oil is introduced is reduced, the lubricating oil can be introduced into the seal chamber 81 more stably. The seal chamber 81 stores the lubricating oil introduced therein, and the sliding portion of the lip seal 31 is lubricated by the stored lubricating oil.

The scroll compressor 301 according to the second embodiment of the present invention described above includes the second oil supply passage 385 that allows the mechanical chamber 80 and the seal chamber 81 to communicate with each other. Therefore, the second oil supply passage 385 introduces the lubricating oil stored in the mechanical chamber 80 into the seal chamber 81, and the sealing chamber 81 stores the introduced lubricating oil inside, and the stored lubricating oil Since the contact portion of the lip seal 31 with the drive shaft 16 is lubricated, the reliability of the lip seal 31 can be improved. Further, the second oil supply passage 385 is formed in a groove shape on the inner peripheral surface of the center housing 21, and the lubricating oil is introduced into the seal chamber 81 along the inner peripheral surface. Thus, the introduction efficiency of the lubricating oil into the seal chamber 81 can be improved. In addition, the second oil supply passage 385 can be formed by a relatively simple process of forming a groove on the inner peripheral surface of the center housing 21, and the manufacturing efficiency can be improved. Further, since the pressure increase in the mechanical chamber is suppressed by the discharge passage 284, the lubricating oil can be stably introduced into the mechanical chamber 80 for a long time, and as a result, the seal chamber 81 can be stably lubricated for a long time. Oil can be introduced.

[Example 3]
FIG. 5 is a cross-sectional view of the scroll compressor 401 according to the third embodiment of the present invention. Scroll compressor 401 according to the third embodiment has substantially the same structure as the scroll compressor 201 according to the first embodiment, carried out in that it includes a second oil supply passage 485 formed in the drive shaft 16 Example 1 is different from the scroll compressor 201 according to FIG. In addition, about the structure, effect | action, and effect which are common in Example 1 , while overlapping description is abbreviate | omitted as much as possible, the same code | symbol is attached | subjected.

  The second oil supply passage 485 is formed to communicate the mechanical chamber 80 and the seal chamber 81. The second oil supply passage 485 is formed inside the large diameter portion 16 a of the drive shaft 16. Further, in the second oil supply passage 485, the opening on the seal chamber 81 side is formed on the outer peripheral side in the radial direction with respect to the rotation axis of the drive shaft 16 than the opening on the mechanical chamber 80 side. In the present embodiment, the second oil supply passage 485 is formed in a substantially L shape.

  The second oil supply passage 485 introduces the lubricating oil stored in the mechanical chamber 80 into the seal chamber 81 where the lip seal 31 is partitioned. The introduction of the lubricating oil from the mechanical chamber 80 to the seal chamber 81 is also performed through the gap between the rolling bearing 30 and the drive shaft 16, but by introducing the lubricating oil through the second oil supply passage 485, Since the resistance when the lubricating oil is introduced is reduced, the lubricating oil can be introduced into the seal chamber 81 more stably.

  Further, the second oil supply passage 485 rotates with the rotation of the drive shaft 16. Therefore, the lubricating oil that has entered the second oil supply passage 485 from the opening on the mechanical chamber 80 side is easily led out from the opening on the sealing chamber 81 side by centrifugal force (centrifugal pump action). The seal chamber 81 stores the lubricating oil introduced therein, and the sliding portion of the lip seal is lubricated by the stored lubricating oil.

The scroll compressor 401 according to the third embodiment of the present invention described above includes the second oil supply passage 485 that allows the mechanical chamber 80 and the seal chamber 81 to communicate with each other. Therefore, the second oil supply passage 485 introduces the lubricating oil stored in the mechanical chamber 80 into the seal chamber 81, and the sealing chamber 81 stores the introduced lubricating oil inside, and the stored lubricating oil Since the contact portion of the lip seal 31 with the drive shaft 16 is lubricated, the reliability of the lip seal 31 can be improved. Further, the second oil supply passage 485 is formed inside the large-diameter portion 16a of the drive shaft 16, and the lubricating oil is introduced into the seal chamber 81 along the inside of the driving shaft 16, so that the lubricating oil has less resistance. It can be introduced into the seal chamber 81 through the passage, and the efficiency of introducing the lubricating oil into the seal chamber 81 can be improved. The second oil supply passage 485 is formed such that the opening on the seal chamber 81 side is formed on the outer peripheral side in the radial direction from the opening on the mechanical chamber 80 side with respect to the rotation axis of the drive shaft 16 and rotates with the rotation of the drive shaft 16. Therefore, the lubricating oil that has entered the second oil supply passage 485 from the opening on the mechanical chamber 80 side is easily led out from the opening on the sealing chamber 81 side by centrifugal force, and the introduction efficiency of the lubricating oil into the sealing chamber 81 is further improved. can do. Further, since the pressure increase in the mechanical chamber is suppressed by the discharge passage 284, the lubricating oil can be stably introduced into the mechanical chamber 80 for a long time, and as a result, the seal chamber 81 can be stably lubricated for a long time. Oil can be introduced.

In addition, the scroll compressor 401 which concerns on Example 3 of this invention mentioned above is not limited to the Example mentioned above, A various change is possible in the range described in the claim. In the above description, the second oil supply passage 485 has been described as having a substantially L shape. For example, the opening on the seal chamber 81 side is the opening on the mechanical chamber 80 side with respect to the rotation axis of the drive shaft 16. Alternatively, it may be formed in a curved shape so as to be on the outer peripheral side in the radial direction, or simply formed in a straight line.

  The scroll compressor according to the present invention is intended to improve performance and reliability by always securing a sufficient amount of mist-like oil contained in the fluid sucked into the inside as a lubricating oil. It is useful when applied to a compressor having a pair of scrolls.

It is sectional drawing of the scroll compressor which concerns on the reference example of this invention. It is sectional drawing of the scroll compressor which concerns on Example 1 of this invention. It is sectional drawing of the center housing of the scroll compressor which concerns on Example 1 of this invention. It is sectional drawing of the scroll compressor which concerns on Example 2 of this invention. It is sectional drawing of the scroll compressor which concerns on Example 3 of this invention.

1, 201, 301, 401 Scroll compressor 11 Housing 12 Compressor 13 Drive unit 14 Fixed scroll 15 Orbiting scroll 16 Drive shaft 21 Center housing 22 Lid housing 26 Suction port 27 Ejection port 30, 56 Rolling bearing 31 Lip seal 39 Suction Chamber 40 Compression chamber 41 Discharge chamber 46 Discharge port 47 Discharge valve 58 Balance weight 60 Eccentric portion 61 Thrust bearing 80 Mechanical chamber 81 Seal chamber 83 First oil supply passage 284 Discharge passages 385 and 485 Second oil supply passage

Claims (6)

A hollow housing inside,
A fixed scroll having an end plate on which a spiral wall body is erected and fixed to the housing;
An orbiting scroll having an end plate on which a spiral wall body is erected, and supported in the housing so as to be able to revolve while preventing rotation while the wall body meshes with the wall body of the fixed scroll. When,
A suction chamber for introducing a fluid containing lubricating oil;
A compression chamber that compresses the fluid introduced into the suction chamber by the orbiting scroll revolving with respect to the fixed scroll;
A drive shaft that is rotatably supported by the housing by a bearing portion, and an eccentric portion formed at one end is engaged with the orbiting scroll via an engaging portion, and a rotational force is transmitted to the orbiting scroll;
A mechanical chamber in which the bearing portion and the engaging portion are partitioned in the housing;
A first oil supply passage for introducing lubricating oil remaining in the compression chamber into the mechanical chamber;
Leakage suppression means for suppressing leakage of lubricating oil introduced into the mechanical chamber ;
A discharge passage for discharging the fluid in the mechanical chamber to the suction chamber side ,
The cross-sectional area of the discharge passage is equal to or larger than the cross-sectional area of the first oil supply passage ,
Scroll compressor. The leakage suppression means includes a thrust bearing that thrust-supports the rear surface of the end plate of the orbiting scroll in contact with the wall surface of the housing.
The scroll compressor according to claim 1. A balance weight connected to the drive shaft so as to rotate integrally with the drive shaft is provided in the mechanical chamber,
The drive shaft is provided along a horizontal direction,
The discharge passage is characterized in that the opening on the mechanical chamber side is formed above the lowest end position in the rotation locus of the balance weight.
The scroll compressor according to claim 1 or 2 . The bearing portion includes a first bearing portion that supports one end portion of the drive shaft, and a second bearing portion that supports the other end.
In the mechanical chamber, the first bearing portion is partitioned,
A lip seal that seals between the housing and the drive shaft is provided adjacent to the second bearing portion,
A seal chamber defined by the lip seal in the housing;
The mechanical chamber and the seal chamber are communicated with each other, and a second oil supply passage for introducing the lubricant into the seal chamber is provided.
The scroll compressor according to any one of claims 1 to 3 . The second oil supply passage is a groove formed in an inner periphery of the housing.
The scroll compressor according to claim 4 . The second oil supply passage is formed in the drive shaft, and the opening on the seal chamber side is formed on the outer peripheral side in the radial direction with respect to the rotation axis of the drive shaft than the opening on the mechanical chamber side. And
The scroll compressor according to claim 4 .

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