JP2010261353A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce sliding loss on a thrust surface on which a fixed scroll and an end plate of a turning scroll in a scroll compressor slide, in connection with efficiency improvement of a refrigerating air-conditioner and application of high-pressure refrigerant such as carbon dioxide in recent years. <P>SOLUTION: A passage 80 is formed inside the end plate 13a of the turning scroll 13. One opening of the passage opens to the thrust sliding surface 40 between the fixed scroll 12 and the end plate 13a of the turning scroll 13, while the other opening opens into a discharge space 31 at the back of an end plate 12b of the fixed scroll 12. Thus, oil can be supplied to the thrust sliding surface 40. This reduces the sliding loss and can achieve an improvement in the compression efficiency and higher reliability. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a scroll compressor used in a cooling device such as an air conditioning air conditioner or a refrigerator, a heat pump type hot water supply device, or the like.

  Conventionally, in a scroll compressor, in order to keep the sliding surface contact between the revolving and fixed end plates in a good state and reduce friction loss, one opening is provided inside the revolving scroll end plate and the fixed scroll end. It opens to the sliding part of the end plate, and the other opening part is provided on the back of the orbiting scroll, and has a configuration in which a passage is opened intermittently by the sliding partition ring to the high-pressure part inside the sliding partition ring. (For example, see Patent Document 1).

  FIG. 11 is a longitudinal sectional view of a compression mechanism portion of a conventional scroll compressor. As shown in FIG. 11, an oil passage 80 is provided in the end plate 13 a of the orbiting scroll 13, and the opening of the oil passage 50 faces the center side from the sliding partition ring 78 as the orbiting scroll 13 turns. The oil at 30 is guided to the sliding surface 40 between the end plate 13 a of the orbiting scroll 13 and the fixed scroll 12. As a result, the end plate 13a and the fixed scroll 12 are well lubricated, and the friction loss is reduced.

JP-A-6-307354

  In the conventional configuration, the oil passage 80 is provided inside the end plate 13a of the orbiting scroll 13 in order to guide the high-pressure oil to the end plate 13a of the orbiting scroll 13 and the sliding surface 13b of the fixed scroll 12. A plug to stop 80 is required, and the number of parts increases. In addition, when leakage from the stopcock occurs, it leads to performance deterioration and reliability deterioration, and thus a process such as leakage inspection is required. Further, the upper surface of the wrap of the fixed scroll 12 becomes difficult to slide between the end plate 13a of the orbiting scroll 13 and the upper surface of the wrap of the fixed scroll 12 due to pressure deformation and thermal expansion of the fixed scroll 12 and the orbiting scroll 13. Then, it was difficult to guide the oil to the end plate 13a of the orbiting scroll 13 and the sliding surface 40 on the upper surface of the wrap of the fixed scroll 12.

  The present invention provides a scroll compressor that can improve the lubrication performance of the sliding surface of the thrust with a simple configuration, reduce the sliding loss, and achieve high efficiency and high reliability in view of the conventional problems. For the purpose.

  In order to solve the above-mentioned conventional problems, the fixed scroll and the orbiting scroll where the spiral wrap rises from the end plate are meshed to form a compression chamber in both directions, and the orbiting scroll is circularly tracked under the restriction of rotation. The compression chamber is moved while changing its volume when it is swung along the line, and after sucking and compressing the refrigerant into the compression chamber, the refrigerant is discharged into the discharge space on the back surface of the fixed scroll. In the scroll compressor supported by the sliding surface between the end plate of the orbiting scroll and the fixed scroll by the back pressure applied to the back surface of the orbiting scroll, A passage through which oil flows is provided, and the passage communicates the discharge space and the sliding surface.

  With this configuration, since the passage is provided inside the fixed scroll end plate, there is no need for a stop stopper, and the oil in the refrigerant in the discharge space on the back of the fixed scroll is slid between the end plate of the orbiting scroll and the fixed scroll. It can be guided to the surface with a simple configuration. Accordingly, it is possible to provide a scroll compressor that can improve the lubrication performance of the sliding surface of the thrust, reduce the sliding loss, and realize high efficiency and high reliability. Further, the wrap upper surface of the fixed scroll has a severe sliding due to the pressure deformation and thermal expansion of the fixed scroll and the orbiting scroll. Since oil can be easily guided to the sliding surface of the top surface of the fixed scroll lap, the lubrication performance of the sliding surface of the thrust can be improved, and the sliding loss is reduced, so that the sliding surface is highly efficient. Since abnormal wear can be suppressed, a scroll compressor that realizes high reliability can be provided.

  The scroll compressor according to the present invention can reduce thrust sliding loss, particularly under a high compression ratio operation, and can realize high efficiency and high reliability of the refrigeration air conditioner.

Sectional drawing of the scroll compressor in Embodiment 1 of this invention Sectional drawing of the compression mechanism part of the scroll compressor in Embodiment 1 of this invention The top view of the compression mechanism part of the scroll compressor in Embodiment 1 of this invention Sectional drawing of the compression mechanism part of the scroll compressor in Embodiment 2 of this invention The top view of the compression mechanism part of the scroll compressor in Embodiment 2 of this invention The top view of the compression mechanism part of the scroll compressor in Embodiment 3 of this invention The top view of the compression mechanism part of the scroll compressor in Embodiment 3 of this invention Sectional drawing of the compression mechanism part of the scroll compressor in Embodiment 4 of this invention Sectional drawing of the compression mechanism part of the scroll compressor in Embodiment 5 of this invention Sectional drawing of the compression mechanism part of the scroll compressor in Embodiment 6 of this invention Sectional view of a conventional scroll compressor

  In the first invention, a fixed scroll where a spiral wrap rises from an end plate and a turning scroll are meshed to form a compression chamber in both directions, and the turning scroll is turned along a circular orbit under the restriction of rotation. When the compression chamber moves while changing the volume, the refrigerant is sucked into the compression chamber, compressed, and then discharged into the discharge space on the back of the fixed scroll. In a scroll compressor supported by a sliding surface between the end plate of the orbiting scroll and the fixed scroll by a back pressure applied to the back surface of the orbiting scroll, a passage through which oil flows is provided in the fixed scroll, and the passage is a discharge space. Communicate with the sliding surface.

With this configuration, since the passage is provided inside the fixed scroll end plate, there is no need for a stop stopper, and the oil in the refrigerant in the discharge space on the back of the fixed scroll is slid between the end plate of the orbiting scroll and the fixed scroll. It can be guided to the surface with a simple configuration. Accordingly, it is possible to provide a scroll compressor that can improve the lubrication performance of the thrust sliding surface, reduce sliding loss, and realize high efficiency and high reliability. Further, the wrap upper surface of the fixed scroll has a severe sliding due to the pressure deformation and thermal expansion of the fixed scroll and the orbiting scroll. Since oil can be easily guided to the sliding surface on the top surface of the fixed scroll lap, the lubrication performance of the sliding surface of the thrust can be improved. Since abnormal wear can be suppressed, a scroll compressor that realizes high reliability can be provided.

  In a second aspect of the invention, particularly in the first aspect of the invention, the first opening on the sliding surface side of the passage is provided in the end plate around the outer periphery of the wrap of the fixed scroll. As a result, oil in the refrigerant in the discharge space at the back of the fixed scroll can be guided to the thrust sliding surface around the outer periphery of the fixed scroll wrap, so that the lubrication performance can be improved, the sliding loss can be reduced, and the high A scroll compressor that achieves high efficiency and high reliability can be provided.

  In the third invention, particularly in the first or second invention, the first opening on the sliding surface side of the passage is provided on the upper surface of the wrap of the fixed scroll. As a result, the upper surface of the fixed scroll and the upper surface of the fixed scroll have severe sliding due to pressure deformation and thermal expansion of the fixed scroll and the orbiting scroll. Since oil can be easily guided to the sliding surface on the top surface of the lap, the lubrication performance of the sliding surface of the thrust can be improved, and sliding loss is reduced, resulting in high-efficiency galling and abnormal wear on the sliding surface. Since it can suppress, the scroll compressor which implement | achieves high reliability can be provided.

  The fourth invention is particularly the second or third invention, wherein at least one of the fixed scroll and the orbiting scroll is formed with a recess, and the recess communicates with the first opening. As a result, oil can be supplied to the recess communicating with the opening on the sliding surface side of the passage, so that the lubrication performance can be improved over a wide range of the thrust sliding surface, and further, the sliding loss can be reduced and high A scroll compressor that achieves high efficiency and high reliability can be provided.

  The fifth invention is any one of the second to fourth inventions, and at least a back pressure chamber is formed on the back surface of the orbiting scroll, and the first opening is provided at a position not communicating with the back pressure chamber. As a result, an increase in the back pressure applied to the back surface of the orbiting scroll due to high pressure oil flowing into the back pressure chamber from the discharge space on the back surface of the fixed scroll can be suppressed, and the lubrication performance of the thrust sliding surface is deteriorated. Therefore, it is possible to provide a scroll compressor that achieves high reliability because it can prevent galling and abnormal wear on the thrust sliding surface.

  The sixth aspect of the invention is particularly any one of the first to fifth aspects of the invention, and a mechanism for separating oil is provided in the second opening on the discharge space side of the passage. The refrigerant discharged into the discharge space on the back of the fixed scroll is in a state where approximately 5 to 10 wt% of oil is mixed, but with this configuration, the oil in the refrigerant is separated by the oil separation mechanism, so Since oil can be guided to the thrust sliding surface, the lubrication performance of the thrust sliding surface can be improved without causing deterioration of lubrication due to the supply of refrigerant gas to the thrust sliding surface, and sliding loss Since the reduction can suppress the galling and abnormal wear on the sliding surface with high efficiency, a scroll compressor realizing high reliability can be provided.

  The seventh invention is the sixth invention, in particular, in which a recess is provided in the second opening. By providing a recess in the opening on the discharge space side of the passage, the oil present in the refrigerant in the discharge space is separated and stored in the recess, and the oil is not supplied to the thrust sliding surface, It is possible to guide, the lubrication performance of the sliding surface of the thrust can be improved reliably, and the sliding loss is reduced, and the high efficiency can be achieved to suppress the galling and abnormal wear on the sliding surface. A scroll compressor can be provided.

The eighth invention is any one of the first to seventh inventions, and the discharge space is formed by installing a muffler. As a result, the refrigerant discharged into the discharge space on the back surface of the fixed scroll once collides with the muffler, so that the oil in the refrigerant is separated and stored on the back surface of the fixed scroll, and the oil is passed from the passage to the thrust sliding surface as a refrigerant gas. Can be guided without being supplied, the lubrication performance of the sliding surface of the thrust can be improved reliably, and the sliding loss can be reduced to suppress galling and abnormal wear on the sliding surface with high efficiency. Therefore, it is possible to provide a scroll compressor that realizes high reliability.

  The ninth aspect of the invention is any one of the first to eighth aspects of the invention, and the passage is provided with a filter for capturing foreign matter. With this configuration, since the filter captures the foreign matter adhering to the fixed scroll back surface and the foreign matter discharged into the discharge space, it can be prevented from being mixed with the oil from the passage into the thrust sliding surface. . Accordingly, a scroll compressor that realizes high efficiency and high reliability by suppressing a deterioration in performance caused by a foreign matter causing a scratch on a thrust sliding surface and leaking from a back pressure chamber to a suction chamber and a compression chamber is provided. Can do.

  A tenth aspect of the invention is any one of the first to ninth aspects of the invention, in which a throttle portion is provided in the passage. Accordingly, an appropriate amount of oil can be supplied to the end plate of the orbiting scroll and the thrust sliding surface of the fixed scroll, and a highly efficient and highly reliable scroll compressor can be realized.

  The eleventh aspect of the invention is particularly any one of the first to tenth aspects of the invention, wherein the refrigerant is carbon dioxide. As a result, the back pressure of the orbiting scroll becomes excessive, and the increase in the sliding loss can be suppressed even in the scroll compressor that tends to increase the sliding loss at the end plate of the orbiting scroll and the thrust sliding portion of the fixed scroll. A scroll compressor that achieves high efficiency and high reliability can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a scroll compressor according to a first embodiment of the present invention, FIG. 2 is an enlarged sectional view of a main part of the compression mechanism portion of FIG. 1, and FIG. 3 is a fixed scroll of the compression mechanism portion. It is the top view which looked at from the downward direction. The operation and action of the scroll compressor configured as shown in the figure will be described below.

  As shown in FIG. 1, the scroll compressor includes a main bearing member 11 of a crankshaft 4 fixed by welding or shrink fitting in a sealed container 1, and a fixed scroll 12 bolted on the main bearing member 11. The scroll-type compression mechanism 2 is configured by sandwiching the orbiting scroll 13 that meshes with the fixed scroll 12. The scroll compressor is further provided with a rotation restricting mechanism 14 such as an Oldham ring that guides the orbiting scroll 13 to rotate in a circular orbit between the orbiting scroll 13 and the main bearing member 11, and the crankshaft. When the orbiting scroll 13 is eccentrically driven by the eccentric shaft portion 4a at the upper end of the orbiting 4, the orbiting scroll 13 moves circularly. Thereby, the compression chamber 15 formed between the fixed scroll 12 and the orbiting scroll 13 becomes smaller while moving from the outer peripheral side to the central portion. During this time, when the refrigerant gas is sucked from the suction pipe 16 communicating with the outside of the sealed container 1 and the suction port 17 on the outer peripheral portion of the fixed scroll 12, the scroll compressor compresses the sucked refrigerant gas. When the refrigerant gas reaches a predetermined pressure or higher, the reed valve 19 is pushed open from the discharge port 18 at the center of the fixed scroll 12 and discharged into the sealed container 1. The scroll compressor repeats such operations and processes.

A sliding partition ring 78 disposed on the main bearing member 11 is provided on the back surface portion of the orbiting scroll 13, and the high-pressure atmosphere that is an inner region of the sliding partition ring 78 is formed by the sliding partition ring 78 while performing the orbiting motion. And a back pressure space 29 set to an intermediate pressure between the high pressure and the low pressure, which is an outer region. By applying pressure on the back surface, the orbiting scroll 13 is stably pressed against the fixed scroll 12, reducing leakage and performing stable circular orbit movement.

  Further, the fixed scroll 12 is provided with a back pressure adjusting valve (not shown) for controlling the pressure in the back pressure space 29 on the back surface of the orbiting scroll 13.

  A pump 25 is provided at the other downward end of the crankshaft 4 and is driven simultaneously with the scroll compressor during compressor operation. As a result, the pump 25 sucks up the oil 6 in the oil reservoir 20 provided at the bottom of the hermetic container 1 and supplies the oil 6 to the compression mechanism 2 through the oil supply hole 26 penetrating the crankshaft 4 along its central axis. . The supply pressure at this time is substantially equal to the discharge pressure of the scroll compressor, and also serves as a back pressure source for the orbiting scroll 13. As a result, the orbiting scroll 13 does not move away from the fixed scroll 12 and does not come into contact with one another, and the predetermined compression function is stably exhibited.

  A part of the oil 6 supplied in this way is obtained by a supply pressure or its own weight so as to obtain a clearance, between the fitting portion between the eccentric shaft portion 4a and the orbiting scroll 13, and between the crankshaft 4 and the main bearing member 11. Then, the oil enters the bearing portion 66, lubricates the respective portions, falls, and returns to the oil sump 20. Another part of the oil 6 supplied to the high-pressure part 30 passes through a passage 54 having an opening in the high-pressure part 30, is around the outer peripheral part of the orbiting scroll 13, and the back pressure at which the rotation restricting mechanism 14 is located. The back pressure of the orbiting scroll 13 is applied in the back pressure space 29 while entering the space 29 and lubricating the sliding portion of the rotation restricting mechanism 14.

  The oil 6 entering the back pressure space 29 is set to an intermediate pressure that is intermediate between the pressures of the high pressure portion 30 and the low pressure side of the compression chamber 15 by the throttle action of the throttle 57. The back pressure space 29 is sealed between the high pressure portion 30 and the high pressure side by an annular partition ring 78, and the pressure increases as the incoming oil 6 is filled. The provided back pressure regulating valve acts, whereby the oil 6 is returned to the suction portion of the compression chamber 15 and enters.

  The oil 6 supplied to the suction port 17 moves to the compression chamber 15 along with the orbiting motion of the orbiting scroll 13 and serves to prevent leakage between the compression chambers 15.

  The oil 6 mixed with the refrigerant gas is roughly present in the refrigerant in an amount of 5 to 10 wt%. After the oil 6 is compressed in the compression chamber 15, the reed valve is discharged from the discharge port 18 at the center of the fixed scroll 12. 19 is pushed open to enter the discharge space 31 on the back of the fixed scroll.

  Thereafter, the refrigerant containing the mist-like oil 6 collides with the muffler 77, and the muffler 77 plays a role of an oil separation mechanism, and the oil 6 is stored in the discharge space 31 side of the end plate 12 b of the fixed scroll 12.

  Further, as shown in FIGS. 1 to 3, a communication path 80 is formed inside the end plate 12 a of the fixed scroll 12. One opening portion (hereinafter referred to as a first opening portion) 80a of the communication path 80 opens to a thrust sliding surface 40 on which the fixed scroll 12 and the end plate 13a of the orbiting scroll 13 slide, and the other opening portion (hereinafter referred to as a first opening portion). , 80 b) opens into the discharge space 31.

Under an operation at a high compression ratio, an excessive pressing force is generated on the sliding surfaces of the end plate 12 a around the outer periphery of the wrap of the fixed scroll 12 and the end plate 13 a of the orbiting scroll 13. For this reason, it is difficult to form an oil film on the sliding surface 40 between the end plate 12a around the outer periphery of the fixed scroll 12 and the end plate 13a of the orbiting scroll 13, and the sliding loss increases and the performance deteriorates. Thus, the oil 6 stored on the discharge space 31 side of the end plate 12b of the fixed scroll 12 is positively supplied to the sliding surface 40, thereby increasing the oil film thickness and reducing the sliding loss and improving the compressor efficiency. In addition, high reliability can be realized.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is an enlarged cross-sectional view of the main part of the compression mechanism portion of the scroll compressor according to the second embodiment of the present invention, and FIG. 5 is a plan view of the fixed scroll of the compression mechanism portion as viewed from below. 4 and 5, configurations corresponding to those in FIGS. 2 and 3 are denoted by the same reference numerals.

  As shown in FIGS. 4 and 5, a communication path 80 is formed inside the end plate 12 a of the fixed scroll 12. The first opening 80 a opens in the thrust sliding surface 40 on which the wrap 12 b of the fixed scroll 12 and the end plate 13 a of the orbiting scroll 13 slide, and the second opening 80 b opens in the discharge space 31.

  As a result, the upper surface of the wrap 12b of the fixed scroll 12 is deformed so that the end plate 13a protrudes upward on the fixed scroll 12 side by the back pressure due to the pressure deformation and thermal expansion of the fixed scroll 12 and the orbiting scroll 13. Since the wrap 12b of the fixed scroll 12 is also deformed upwardly toward the orbiting scroll 13, the end plate 13a of the orbiting scroll 13 and the sliding surface 40 on the upper surface of the wrap 12b of the fixed scroll 12 become more severe. Since oil is guided to the sliding surface 40 on the top surface of the end plate 13a and the wrap 12b of the fixed scroll 12, the lubricating performance of the thrust sliding surface 40 can be improved, and the sliding surface 40 is highly efficient by reducing sliding loss. A scroll compressor that achieves high reliability because it can suppress galling and abnormal wear It is possible.

  Further, it goes without saying that by configuring both the first embodiment and the second embodiment, it is more efficient and highly reliable.

(Embodiment 3)
A third embodiment of the present invention will be described with reference to FIGS. 6 and 7 are plan views of the fixed scroll of the compression mechanism portion of the scroll compressor according to the third embodiment of the present invention as seen from below. 6 particularly shows a case where the first opening 80a is provided in the end plate 12a around the outer periphery of the wrap 12b of the fixed scroll 12, and FIG. 7 particularly shows the first opening 80a in the wrap 12b of the fixed scroll 12. The case where it provided is shown.

  As shown in FIGS. 6 and 7, the fixed scroll 12 is formed with a recess 81 a that communicates with the opening on the thrust sliding surface 40 side of the passage 80.

  6 and 7, oil can be supplied to the recess 81 a communicating with the first opening 80 a on the thrust sliding surface 40 side of the passage 80, so that lubrication is performed over a wide range of the thrust sliding surface 40. It is possible to provide a scroll compressor that can improve performance, reduce sliding loss, and achieve high efficiency and high reliability.

  6 and 7, the recessed portion 81a communicating with the first opening 80a on the thrust sliding surface 40 side is provided in the fixed scroll 12, but the same effect can be obtained by providing it in the end plate 13a of the orbiting scroll 13. Needless to say.

Further, the first opening 80a and the recess 81a communicating with the first opening 80a are provided at a position not communicating with the back pressure chamber 29 (see FIG. 1). Thereby, the increase in the back pressure applied to the back surface of the orbiting scroll 13 due to the high pressure oil 6 flowing into the back pressure chamber 29 from the discharge space 31 on the back surface of the fixed scroll 12 can be suppressed, and the thrust sliding surface Therefore, it is possible to provide a scroll compressor that achieves high reliability because it is possible to prevent deterioration of the lubrication performance of 40 and suppress galling and abnormal wear on the thrust sliding surface 40.

(Embodiment 4)
A fourth embodiment of the present invention will be described with reference to FIG. FIG. 8 is an enlarged cross-sectional view of a main part of a compression mechanism portion of a scroll compressor according to the fourth embodiment of the present invention. As shown in FIG. 8, a recess 81 b is formed in the second opening 80 b of the passage 80.
Since the refrigerant discharged into the discharge space 31 on the back surface of the fixed scroll 12 once collides with the muffler 77, the oil in the refrigerant is separated and stored in the end plate 12a on the discharge space 31 side of the fixed scroll 12. However, by providing the recess 81b in the second opening 80b of the passage 80, the oil stored in the end plate 12a of the fixed scroll 12 is further separated, captured and stored in the recess 81b. Can be guided to the thrust sliding surface 40 without being supplied with refrigerant gas, the lubrication performance of the thrust sliding surface 40 can be reliably improved, and the sliding loss can be reduced and the sliding can be performed with high efficiency. Since it is possible to suppress galling and abnormal wear on the surface 40, it is possible to provide a scroll compressor that achieves high reliability.

(Embodiment 5)
The fifth embodiment of the present invention will be described with reference to FIG. FIG. 9 is an enlarged cross-sectional view of the main part of the compression mechanism of the scroll compressor according to the fifth embodiment of the present invention. As shown in FIG. 9, the scroll compressor includes a filter 82 that captures foreign matter in the passage 80.

  Thereby, since the filter 82 captures the foreign matter adhering to the back surface portion of the fixed scroll 12 and the foreign matter discharged into the discharge space 31, the foreign matter is mixed with the oil from the passage 80 into the thrust sliding surface 40. Can be suppressed. That is, the foreign matter mixed through the passage 80 causes a scratch on the thrust sliding surface 40, and the deterioration of performance due to leakage from the back pressure chamber 29 to the suction chamber and the compression chamber 15 is suppressed, and the efficiency is high. A scroll compressor that realizes reliability can be provided.

(Embodiment 6)
A sixth embodiment of the present invention will be described with reference to FIG. FIG. 10 is an enlarged cross-sectional view of the main part of the compression mechanism of the scroll compressor according to the sixth embodiment of the present invention.
As shown in FIG. 10, the scroll compressor includes a throttle portion 83 in a part of the communication path 80.

  Thus, an appropriate amount of oil 6 can be supplied to the thrust sliding surface 40 of the end plate 13a of the fixed scroll 12 and the orbiting scroll 13, and a more efficient scroll feel can be realized. In addition, when the throttle portion 83 is provided, it is possible to prevent foreign matter from entering the throttle portion and the high reliability of the thrust sliding surface 40 can be realized.

(Embodiment 7)
In the scroll compressor according to the seventh embodiment of the present invention, the refrigerant is a high-pressure refrigerant, for example, carbon dioxide (not shown). Even in a scroll compressor in which the back pressure of the orbiting scroll 13 is excessive and the sliding loss at the thrust sliding portion 40 tends to increase, if the first embodiment is used, the increase in sliding loss can be suppressed, A highly efficient and highly reliable scroll compressor can be realized.

As described above, the scroll compressor according to the present invention can achieve higher efficiency and higher reliability than reduction of sliding loss even under high compression ratio operation, and the air scroll compression is not limited to the working fluid as a refrigerant. The present invention can also be applied to the use of scroll fluid machines such as compressors, vacuum pumps, and scroll type expanders.

6 Oil 11 Main bearing member 12 Fixed scroll 12a End plate 12b Wrap 13 Orbiting scroll 13a End plate 14 Rotation restricting mechanism 15 Compression chamber 17 Suction port 29 Back pressure space 30 High pressure portion 31 Discharge space 40 Thrust slide surface 77 Muffler 78 Slide partition ring 80 passage 80a first opening 80b second opening 81a concave portion of sliding surface side opening portion 81b concave portion of discharge space side opening portion 82 filter 83 restricting portion

Claims (11)

When the fixed scroll and the orbiting scroll where the spiral wrap rises from the end plate are meshed to form a compression chamber in both directions, and when the orbiting scroll is orbited along a circular orbit under the regulation of rotation, By moving the compression chamber while changing the volume, the refrigerant is sucked into the compression chamber and compressed, and then discharged into the discharge space on the back surface of the fixed scroll. In the scroll compressor supported by the sliding surface between the end plate of the orbiting scroll and the fixed scroll by the back pressure applied to the back of the orbiting scroll,
The fixed scroll is provided with a passage through which oil flows, and the passage communicates the discharge space and the sliding surface.   2. The scroll compressor according to claim 1, wherein the first opening portion on the sliding surface side of the passage is provided in an end plate around an outer periphery of the wrap of the fixed scroll.   The scroll compressor according to claim 1 or 2, wherein the first opening portion on the sliding surface side of the passage is provided on the upper surface of the wrap of the fixed scroll.   The scroll compressor according to claim 2 or 3, wherein a recess is formed in at least one of the fixed scroll and the orbiting scroll, and the recess communicates with the first opening.   5. The scroll compressor according to claim 2, wherein at least a back pressure chamber is formed on a back surface of the orbiting scroll, and the first opening is provided at a position not communicating with the back pressure chamber.   The scroll compressor according to any one of claims 1 to 5, wherein a mechanism for separating oil is provided in a second opening of the passage on the discharge space side.   The scroll compressor according to claim 6, wherein the second opening is provided with a recess.   The scroll compressor according to any one of claims 1 to 7, wherein the discharge space is formed by installing a muffler.   The scroll compressor according to claim 1, wherein the passage is provided with a filter for capturing foreign matter.   The scroll compressor according to any one of claims 1 to 9, wherein a throttle portion is provided in the passage.   The scroll compressor according to any one of claims 1 to 10, wherein the refrigerant is carbon dioxide.