JP2011012600A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor capable of stably pressing a turning scroll to a fixed scroll.SOLUTION: This scroll compressor delivers refrigerant gas to a delivery space by compressing the refrigerant gas sucked in a compression space 15 formed between the fixed scroll 12 and the turning scroll 13 by eccentrically driving the turning scroll 13, and has first and second lubricating oil reservoirs 81 and 82 arranged in a mutually opposed position with the turning center of the turning scroll 13 as a reference on the anti-lap side of the fixed scroll 12 and storing lubricating oil included in the delivery refrigerant gas to the delivery space 31, and first and second high pressure oil supply passages 81a and 82a for communicating the first and second lubricating oil reservoirs 81 and 82 and opening on a lap side sliding surface of the fixed scroll 12.

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.

  Hereinafter, a conventional scroll compressor will be described with reference to FIGS. FIG. 5 is a vertical cross-sectional view of a conventional scroll compressor, and FIG. 6 is an enlarged vertical cross-sectional view within a dashed line A in FIG.

  In the scroll compressor of FIGS. 5 and 6, a main bearing member 11 that receives a crankshaft 4 that is fixed by welding, shrink fitting, or the like, and a fixed scroll that is bolted onto the main bearing member 11 in the sealed container 1. The scroll-type compression mechanism 2 is configured by sandwiching the orbiting scroll 13 that engages with the fixed scroll 12.

  In the sealed container 1, a rotation restricting mechanism 14 is provided between the orbiting scroll 13 and the main bearing member 11 by an Oldham ring or the like that guides the orbiting scroll 13 so as to prevent the rotation of the orbiting scroll 13 and perform a circular orbit movement.

  In the conventional scroll compressor, the orbiting scroll 13 is eccentrically driven by the eccentric shaft portion 4 a at the upper end of the crankshaft 4, thereby causing the orbiting scroll 13 to move in a circular path, and thereby, between the fixed scroll 12 and the orbiting scroll 13. Refrigerant gas from the suction pipe 16 communicating with the outside of the hermetic container 1 and the suction port 17 on the outer peripheral part of the fixed scroll 12 by utilizing the fact that the compression chamber 15 formed on the outer side becomes smaller while moving from the outer peripheral side to the central part. (For example, a high pressure refrigerant such as carbon dioxide) is sucked in and compressed. 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 discharge space 31. Here, the discharge space 31 is formed by the muffler 77 installed on the side opposite to the wrap (that is, the back surface) of the fixed scroll 12 and the back surface of the fixed scroll 12.

  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 sliding partition ring 78 causes a high pressure region 30 that is an inner region of the sliding partition ring 78 and an outer region. Is divided into a back pressure space 29 set at an intermediate pressure of high pressure and low pressure. 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 includes a back pressure adjusting valve 9 that controls 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. During operation of the compressor, this pump 25 is driven simultaneously with the scroll compressor. 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 extending vertically through the crankshaft 4. 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 each other, 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. 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 region 30 is driven by the orbiting scroll 13 through a passage 54 having an opening in the high pressure region 30, and the end plate of the fixed scroll 12 and the wrap 13 c of the orbiting scroll 13. It branches into the sliding portion 13d and a back pressure space 29 around the outer periphery of the orbiting scroll 13 where the rotation restricting mechanism 14 is located. The entering oil 6 applies the back pressure of the orbiting scroll 13 in the back pressure space 29 in addition to lubricating the sliding portion 13d and 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 region 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 region 30 and the high pressure side by an annular partition ring 78. The pressure increases as the incoming oil fills up, and when the pressure exceeds a predetermined pressure, the back pressure regulating valve 9 Acts to return to the suction portion of the compression chamber 15 and enter.

  The approach of the oil 6 is repeated at a predetermined cycle, and the timing of this repetition is determined by the combination of the repetitive cycle of suction, compression and discharge and the relationship between the pressure reduction setting by the throttle 57 and the pressure setting by the back pressure adjusting mechanism 9. In addition, intentional lubrication of the sliding portion 13d between the fixed scroll 12 and the wrap 13c of the orbiting scroll 13 is achieved. This intentional lubrication is always guaranteed by the opening of the communication path 10 by the back pressure regulating valve 9 as described above. 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.

  Further, as shown in FIGS. 3 and 4, one opening is provided inside the end plate 13 a of the orbiting scroll 13 so that the fixed scroll 12 and the end plate 13 a of the orbiting scroll 13 slide with each other as the orbiting scroll 13 is driven. A communication passage 80 is provided which is intermittently opened in the moving sliding surface 13 b and intermittently opened in the compression chamber 15, and the other opening is always opened in the high-pressure part 30.

  Inside the end plate 13a of the orbiting scroll 13, one opening is intermittently opened to the sliding surface 13a between the end plate 12a of the fixed scroll 12 and the end plate 13a of the orbiting scroll 13 and the compression chamber 15, and the other opening is open. By providing the communication passage 80 that is always open in the high-pressure part 30, by always supplying the oil 6 to the sliding surface 13a, the sliding loss is reduced, and the leakage loss of the compression chamber 15 is reduced, Improved compression efficiency and higher reliability can be realized.

JP 2007-32294 A

  In the conventional configuration, in order to guide the high-pressure lubricating oil from the orbiting scroll 13 toward the fixed scroll 12, a force that resists the pressing force from the back of the orbiting scroll 13 acts, and the orbiting scroll 13 is stably stabilized. It was difficult to press.

  Therefore, an object of the present invention is to provide a scroll compressor capable of stably pressing a turning scroll against a fixed scroll.

To achieve the above object, the present invention provides a scroll that compresses refrigerant gas sucked into a compression chamber formed between the fixed scroll and the orbiting scroll and discharges it into the discharge space by driving the orbiting scroll eccentrically. A compressor that is provided on the opposite side of the fixed scroll on the opposite side of the fixed scroll and facing each other with respect to the orbiting center of the orbiting scroll, and stores the lubricating oil contained in the refrigerant gas discharged to the discharge space; A second lubricating oil reservoir and first and second high-pressure oil supply passages communicating with the first and second lubricating oil reservoirs and opening on the sliding surface on the wrap side of the fixed scroll are provided.

  According to the above configuration, since the distribution of the force that presses against the fixed scroll is evenly arranged from the opposite side of the orbiting scroll, the abnormal phenomenon that the orbiting scroll leaves the orbiting scroll and becomes incompressible during operation. Can be prevented. In addition, 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.

Sectional drawing of the compression mechanism of the scroll compressor which concerns on one embodiment of this invention Plan view of fixed scroll according to the present embodiment The top view which looked at the 1st and 2nd lubricating oil reservoirs 81 and 82 of FIG. 1, and each periphery from upper direction The schematic diagram which shows the alternative example of the 1st and 2nd high pressure oil supply path 81a, 82a of FIG. Longitudinal sectional view of a conventional scroll compressor The longitudinal cross-sectional view which expanded the dashed-dotted line A inside of FIG.

  As described above, the present invention is a scroll compressor that compresses the refrigerant gas sucked into the compression chamber formed between the fixed scroll and the orbiting scroll by driving the orbiting scroll eccentrically and discharges the refrigerant gas into the discharge space. A first scroll and a second scroll which are provided on opposite sides of the fixed scroll and are opposed to each other with respect to the turning center of the orbiting scroll, and store lubricating oil contained in the refrigerant gas discharged to the discharge space. A lubricating oil reservoir and first and second high-pressure oil supply passages that communicate with the first and second lubricating oil reservoirs and open to the sliding surface on the wrap side of the fixed scroll are provided. With this configuration, the force that presses the fixed scroll against the force that separates the orbiting scroll due to the pressure in the compression chamber is determined by the sliding pressure from the lubricant applied to the back of the orbiting scroll and the resultant force of the intermediate pressure between the suction pressure and the discharge pressure. This is the balance of the force applied to the orbiting scroll by the high-pressure lubricant guided to the surface. By placing the high-pressure lubricant at a position facing the center of the orbiting scroll, the orbiting scroll has an average force in the circumferential direction. Since the orbiting scroll is pressed against the fixed scroll, the orbiting scroll can be revolved on the basis of good lubrication without leaving the fixed scroll, and a scroll compressor can be provided that reduces sliding loss and realizes high efficiency and high reliability.

  The fixed scroll is formed with a discharge hole that opens toward the discharge space, and the bottoms of the first and second lubricating oil reservoirs are preferably lower than the opening of the discharge hole. As a result, the first and second lubricating oil reservoirs can separate and capture the lubricating oil contained in the discharged refrigerant.

  The first and second high-pressure oil supply paths are preferably provided with first and second throttle portions. Thus, an appropriate amount of lubricating 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.

It is preferable to further include a first filter and a second filter that are installed in the first and second lubricating oil reservoirs and capture foreign substances. With this configuration, foreign matter that adheres to the back surface of the fixed scroll or is discharged into the discharge space is captured by each filter, so these foreign matters are mixed with the lubricating oil from the high-pressure oil supply path into the thrust sliding surface. This can be suppressed. 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.

  It is preferable that the scroll compressor further includes a muffler that is installed on the fixed scroll and forms a discharge space. As a result, the refrigerant discharged into the discharge space on the back side of the fixed scroll once collides with the muffler, so that the lubricating oil in the refrigerant is separated and stored on the back side of the fixed scroll, and the lubricating oil is thrust through the high-pressure oil supply passage. It becomes possible to guide without supplying refrigerant gas to the moving surface, and the lubrication performance of the sliding surface of the thrust can be reliably improved, and the sliding loss is reduced, and the sliding surface is highly efficient to cause galling and abnormal wear. Therefore, it is possible to provide a scroll compressor that realizes high reliability.

  In the scroll compressor, the refrigerant is, for example, carbon dioxide. In this case, this suppresses an increase in sliding loss even in a scroll compressor in which the back pressure of the orbiting scroll becomes excessive and the sliding loss tends to increase between the end plate of the orbiting scroll and the thrust sliding portion of the fixed scroll. Therefore, it is possible to provide a scroll compressor that achieves high efficiency and high reliability.

  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)
FIG. 1 is a sectional view of a compression mechanism of a scroll compressor according to an embodiment of the present invention, and FIG. 2 is a plan view of a fixed scroll according to the present embodiment. In the present embodiment, the same reference numerals are given to the corresponding parts in FIG. 3 or FIG.

  The scroll compressor shown in FIGS. 1 and 2 is different from those shown in FIGS. 5 and 6 in that the first and second lubricating oil reservoirs 81 and 82, The second difference is that the second high-pressure oil supply passages 81a and 82b are provided. Further, the scroll compressor shown in FIGS. 1 and 2 is different from that shown in FIGS. 5 and 6 in that the back pressure adjusting valve 9 and the communication passage 10 are omitted. As described above, the scroll compressor according to the present embodiment has many parts in common with the conventional one. Therefore, in FIGS. 1 and 2, components corresponding to those in FIGS. 5 and 6 are denoted by the same reference numerals, and description thereof is omitted or simplified.

  The first and second lubricating oil reservoirs 81 and 82 are on the opposite side of the fixed scroll 12, and both are provided at positions opposite to each other with respect to the turning center of the turning scroll 13. Here, the bottoms of the first and second lubricating oil reservoirs 81 and 82 are preferably positioned lower than the opening portion of the discharge hole 18. As a result, the first and second lubricating oil reservoirs 81 and 82 can separate and capture the lubricating oil contained in the refrigerant discharged from the discharge hole 18.

  FIG. 3 is a plan view of the first and second lubricating oil reservoirs 81 and 82 and their surroundings as viewed from above. As shown in FIG. 3, the first and second lubricating oil reservoirs 81 are provided. , 82 are provided with first and second filters 81b, 82b made of mesh, for example. As a result, foreign matter that adheres to the back surface of the fixed scroll 12 or is discharged into the discharge space is captured by the filters 81b and 82b. Can be mixed.

  Further, first and second high-pressure oil supply passages 81 a and 82 a are formed from the lubricating oil reservoirs 81 and 82 so as to open on the sliding surface on the lap side of the fixed scroll 12. Here, in the example of FIG. 1, the first and second high-pressure oil supply paths 81 a and 82 a have substantially uniform diameters from the wrap side of the fixed scroll 12 to the orbiting scroll 13. However, the present invention is not limited to this, and as shown in FIG. 4, the first and second throttle portions 81c and 82c are provided by changing the diameters of the first and second high-pressure oil supply paths 81a and 82a. It doesn't matter. Thereby, an appropriate amount of lubricating oil can be supplied to the end plate of the orbiting scroll 13 and the thrust sliding surface of the fixed scroll 12, and a highly efficient and highly reliable scroll compressor can be realized.

  The refrigerant gas that has come out from the discharge hole 18 into the discharge space contains lubricating oil that seals the lubrication in the compression chamber and the leak of the minute gap. A part of such lubricating oil adheres to the upper surface of the fixed scroll 12 and collects in the lubricating oil reservoirs 81 and 82. The collected lubricating oil passes from the lubricating oil reservoirs 81 and 82 through the high pressure oil supply paths 81a and 82a, and the high pressure lubricating oil is supplied to the sliding surface on the lap side.

  The anti-lap side of the orbiting scroll 13 is in contact with the high pressure lubricant and the back pressure space. Further, combined with the pressure generated in the compressor section, it resists the force of separating the orbiting scroll 13 from the fixed scroll 12. Here, since the high-pressure oil supply passages 81a and 82a are set at positions opposed to the center of the orbiting scroll 13, only one side of the orbiting scroll 13b is not separated and the lubricating oil in the sliding portion is secured. Reduces friction loss and ensures high reliability.

  In addition, since a high-pressure supply path can be easily formed simply by communicating the anti-wrap surface of the fixed scroll 12 and the wrap surface, a scroll compressor that achieves high efficiency and high reliability by reducing sliding loss with an inexpensive configuration. Can be provided.

  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 applications of scroll fluid machines such as compressors, vacuum pumps, and scroll type expanders.

12 Fixed scroll 13 Orbiting scroll 15 Compression chamber 81, 82 Lubricating oil reservoir 81a, 82a High pressure oil supply path 81b, 82b Filter 81c, 82c Restriction part

Claims (6)

A scroll compressor that compresses refrigerant gas sucked into a compression chamber formed between the fixed scroll and the orbiting scroll by eccentric driving of the orbiting scroll and discharges the refrigerant gas into the discharge space,
First and second lubrication provided on opposite sides of the fixed scroll and at positions opposed to each other with respect to the orbiting center of the orbiting scroll and for accumulating lubricating oil contained in the refrigerant gas discharged to the discharge space. An oil sump,
First and second high-pressure oil supply passages communicating with the first and second lubricating oil reservoirs and opening on a sliding surface on the lap side of the fixed scroll;
A scroll compressor. The fixed scroll has a discharge hole that opens toward a discharge space, and the bottoms of the first and second lubricating oil reservoirs are lower than the opening of the discharge hole. The scroll compressor according to claim 1. The scroll compressor according to claim 1 or 2, wherein the first and second high-pressure oil supply paths are provided with first and second throttle portions. The scroll compressor according to any one of claims 1 to 3, further comprising first and second filters that are installed in the first and second lubricating oil reservoirs and capture foreign substances.   The scroll compressor in any one of Claims 1-4 further equipped with the muffler which is installed in the said fixed scroll and forms the said discharge space.   The scroll compressor according to any one of claims 1 to 5, wherein the refrigerant is carbon dioxide.