JP2008309078A - Scroll compressor - Google Patents

Abstract

[PROBLEMS] With the recent increase in efficiency of refrigeration and air-conditioning equipment and the application of high-pressure refrigerants such as carbon dioxide, leakage loss in a compression chamber formed by a fixed scroll and a turning scroll in a scroll compressor has been an issue. .
A tip seal storing groove 81 for storing the tip seal 80 is provided at the tip of the spiral wrap 13b of the orbiting scroll 13, and the bottom surface of the tip seal storing groove 81 communicates with an inner region of a sliding partition ring 78. The communication passages 82 and 83 are installed inside the orbiting scroll 13 so that the entire area of the tip seal 80 is surely pressed against the fixed scroll 12 from the inner region of the sliding partition ring 78 by the high pressure from a plurality of locations. During pressure operation, leakage in the compression chamber 15 can be reduced, and a highly efficient scroll compressor can be realized.
[Selection] Figure 2

Description

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

  Conventionally, in a scroll compressor, a configuration in which a bottom surface of a tip seal storage groove for storing a tip seal provided at a lap tip of the orbiting scroll and a communication groove for connecting a high-pressure sliding partition ring are provided inside the orbiting scroll. (For example, refer to Patent Document 1).

  FIG. 6 is a cross-sectional view of a compression mechanism portion of a conventional scroll compressor described in Patent Document 1.

As shown in FIG. 6, a tip seal storage groove 81 is provided in the wrap tip 13 b of the orbiting scroll 13, a tip seal 80 is mounted therein, and the sliding portion of the orbiting scroll 13 and the fixed scroll 12 is sealed. A communication passage 82 is provided to communicate the tip seal storage groove 81 with the high-pressure portion 30 on the back surface of the end plate 13a of the orbiting scroll 13, and oil in the high-pressure portion 30 in the inner region of the sliding partition ring 78 is supplied to the wrap tip of the orbiting scroll. By leading to 13b, a good lubrication situation is achieved and leakage loss is reduced.
JP 2000-213477 A

  When carbon dioxide refrigerant is used, the pressure difference between the discharge pressure and the suction pressure of the compressor is about 7 to 10 times higher than the pressure difference of the conventional refrigeration cycle using chlorofluorocarbon as the refrigerant. For this reason, the performance was lowered due to leakage in the compression chamber.

  Therefore, as in the above-described conventional configuration, oil is supplied from the inner region of the high-pressure sliding partition ring to the bottom surface of the chip seal storage groove, and the oil overflows from the chip seal storage groove and is formed outside across the perpendicular direction. The leakage passage to the compression chamber having a lower pressure is blocked, and further supplied to the wall surface forming the compression chamber. However, depending on the clearance between the chip seal and the chip seal storage groove during operation, the entire area of the chip seal is not pressed against the fixed scroll, and there is a problem that the performance deteriorates due to leakage in the compression chamber.

  Further, since the differential pressure between the inner region of the high-pressure sliding partition ring and the bottom surface of the chip seal storage groove is large, a large amount of oil is supplied to the compression chamber, and there is a problem that performance is deteriorated by suction heating and oil compression. .

  The present invention solves the above-mentioned conventional problems, wherein the bottom surface of the tip seal storage groove has a plurality of communication passages communicating with the inner region of the sliding partition ring, and an appropriate amount of oil is supplied to the tip seal storage groove. An object of the present invention is to provide a highly efficient and reliable scroll compressor that is supplied to reduce leakage in the compression chamber.

  In order to solve the above-described conventional problems, a scroll compressor according to the present invention is provided with a tip seal storage groove for storing a tip seal at the tip of a spiral wrap of a orbiting scroll, and the bottom surface of the tip seal storage groove is a sliding partition ring. A plurality of communication passages communicating with the inner region of the orbiting scroll are provided inside the orbiting scroll.

  With this configuration, during operation, a plurality of high pressures are led from the inner area of the sliding partition ring to the bottom surface of the chip seal storage groove, and the entire area of the chip seal is pressed against the fixed scroll by the pressure, causing leakage in the compression chamber. Can be reduced.

  The scroll compressor of the present invention can improve the efficiency of the compressor by reducing the leakage loss even when the pressure difference between the discharge pressure and the suction pressure is high. High reliability in terms of the Hanes last can be realized.

  According to a first aspect of the present invention, there is provided a tip seal storage groove for storing the tip seal at the tip of the spiral wrap of the orbiting scroll, and the bottom surface of the tip seal storage groove passes through the communication path communicating with the inner region of the sliding partition ring. A plurality of them are installed inside.

  In particular, when carbon dioxide refrigerant is used, the pressure difference between the discharge pressure and the suction pressure of the compressor is high, and the performance is degraded due to leakage in the compression chamber. According to the present invention, during operation, high pressure oil is guided from a plurality of locations from the inner region of the sliding partition ring to the bottom surface of the chip seal storage groove, and the entire tip seal is surely pressed against the fixed scroll by the pressure. Leakage in the compression chamber can be reduced, and a highly efficient scroll compressor can be realized. In addition, during high differential pressure operation, oil is supplied from the inner area of the high-pressure sliding partition ring to the bottom surface of the chip seal storage groove, and an appropriate amount of oil overflows from the chip seal storage groove into the compression chamber, so that it is relatively free of sliding. High reliability can be realized because it is possible to supply even the strict Hanelast surface.

  The second aspect of the invention is particularly the first aspect of the invention, wherein a part of the communication path is a narrow hole having a throttling effect. This makes it possible to adjust the amount of oil supplied from the inner area of the high-pressure sliding partition ring to the bottom surface of the chip seal storage groove, reducing losses due to suction heating and oil compression, and reducing leakage loss in the compression chamber. A highly efficient scroll compressor can be realized.

  The third invention is the first or second invention, particularly, wherein the radial clearance between the chip seal storage groove and the chip seal is in the range of 0.05 to 0.10 times the thickness of the chip seal.

  By setting the radial clearance between the tip seal storage groove and tip seal to 0.05 times the thickness of the tip seal, even if the tip seal is thermally expanded during operation, the tip seal is removed from the inner area of the sliding partition ring. The high pressure at multiple locations led from the bottom of the storage groove ensures that the entire chip seal is pressed against the fixed scroll, reducing leakage in the compression chamber and realizing a highly efficient scroll compressor. . In addition, since an appropriate amount of oil that overflows from the radial clearance between the tip seal storage groove and the tip seal into the compression chamber can be supplied to the Hanes last surface that is relatively slid, high reliability can be realized. . By setting it to 0.10 or less, oil is supplied from the inner region of the high-pressure sliding partition ring to the bottom surface of the chip seal storage groove, and the high-temperature oil is compressed from the radial clearance between the chip seal storage groove and the chip seal. By suppressing the amount of overflow, the intake heating and oil compression can be suppressed, leakage loss in the compression chamber can be reduced, and a highly efficient scroll compressor can be realized.

  The fourth invention is the first to third inventions, in particular, in which the axial clearance between the chip seal storage groove and the chip seal is 0 to 0.06 times the thickness of the chip seal.

By setting the axial clearance between the tip seal storage groove and the tip seal to be 0 times or more the thickness of the tip seal, the tip seal storage groove and the tip in an amount corresponding to the difference between the wrap height of the orbiting scroll and the wrap height of the fixed scroll. The seal's axial clearance is filled with high-pressure oil, and the entire tip seal is reliably pressed against the fixed scroll, reducing leakage in the compression chamber and realizing a highly efficient scroll compressor. . And by making it 0.06 times or less, an appropriate amount of oil is guided from the inner region of the sliding partition ring to the bottom surface of the chip seal storage groove and is not excessively supplied to the compression chamber. Performance degradation due to compression can be suppressed.

  The fifth invention is particularly the first to fourth inventions, in which a spring member is disposed between the chip seal storage groove and the chip seal.

  As a result, the entire area of the chip seal is more reliably pressed against the fixed scroll, leakage in the compression chamber can be reduced, and a highly efficient scroll compressor can be realized.

  The sixth invention is particularly the first to fifth inventions, and uses carbon dioxide as a working refrigerant.

  Since the carbon dioxide refrigerant is a high differential pressure refrigerant, an excessive pressing force is generated on the surface on which the end plate of the orbiting scroll and the end plate of the fixed scroll slide. It will cause abnormal wear. When carbon dioxide refrigerant is used, the pressure difference between the discharge pressure and the suction pressure of the compressor is about 7 to 10 times higher than the pressure difference of the conventional refrigeration cycle using chlorofluorocarbon as a refrigerant. Furthermore, the performance was reduced. According to the first to fifth inventions, since the high pressure oil is guided from a plurality of locations from the inner region of the sliding partition ring to the bottom surface of the tip seal storage groove, the entire tip seal is reliably pressed against the fixed scroll by the high pressure. Thus, leakage in the compression chamber can be reduced, and a highly efficient scroll compressor can be realized.

  In addition, since the appropriate amount of high-pressure oil in the inner area of the sliding partition ring is guided to the bottom surface of the tip seal storage groove, an appropriate amount of oil is also introduced into the compression chamber, and there is no loss in performance due to suction heating and leakage loss in the compression chamber. This makes it possible to realize a highly efficient and highly reliable scroll compressor. Further, sliding loss can be reduced, and galling and abnormal wear on the sliding surface can be suppressed by good lubrication with oil, and a highly reliable scroll compressor can be realized.

  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 the first embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a main part of a compression mechanism portion of FIG. 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 of the present invention includes a main bearing member 11 of a crankshaft 4 fixed by welding or shrink fitting in an airtight container 1, and a fixed 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 between the scroll 12 and prevents the orbiting scroll 13 from rotating between the orbiting scroll 13 and the main bearing member 11. By providing an anti-rotation mechanism 14 such as an Oldham ring that guides the orbit to move, the orbiting scroll 13 is eccentrically driven by the eccentric shaft portion 4a at the upper end of the crankshaft 4, thereby causing the orbiting scroll 13 to move in a circular orbit, Thereby, the compression chamber 15 formed between the fixed scroll 12 and the orbiting scroll 13 is small while moving from the outer peripheral side to the center portion. The refrigerant gas is sucked and compressed from the suction pipe 16 communicating with the outside of the hermetic container 1 and the suction port 17 on the outer peripheral portion of the fixed scroll 12, and the refrigerant gas exceeding the predetermined pressure is fixed. Reed valve 1 from the discharge port 18 at the center of the scroll 12
9 is repeatedly opened and discharged into the sealed container 1.

  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 portion that is an inner region of the sliding partition ring 78 is formed by the sliding partition ring 78 while performing the orbiting motion. 30 and a back pressure space 29 set to an intermediate pressure of high pressure and 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 9 that controls the pressure in the back pressure space 29 on the back surface of the orbiting scroll 13.

  During operation of the compressor, a pump 25 is provided at the other downward end of the crankshaft 4 and is driven simultaneously with the scroll compressor. 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 it 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.

  Further, the oil 6 supplied to the high pressure portion 30 enters the back pressure space 29 around the outer peripheral portion of the orbiting scroll 13 where the rotation restricting mechanism 14 is located by the communication passage 54 provided in the orbiting scroll. The back pressure of the orbiting scroll 13 is applied in the back pressure space 29 in addition to lubricating the sliding portion by the meshing of the fixed scroll 12 and the orbiting scroll 13 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 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. The pressure increases as the incoming oil is filled, and when the pressure exceeds a predetermined pressure, the back pressure adjusting 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 a combination of the repetitive cycle of suction, compression, and discharge, and the relationship between the pressure setting by the throttle hole 57 and the pressure setting by the back pressure adjusting mechanism 9. As a result, the sliding of the fixed scroll 12 and the wrap 13b of the orbiting scroll 13 is intentionally lubricated. This intentional lubrication is always ensured by the opening of the communication path 10 into the recess 105 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. 1 and 2, a tip seal storage groove 81 for storing the tip seal 80 and the tip seal storage groove 81 is provided at the tip of the spiral wrap 13b of the orbiting scroll 13, and the bottom surface of the tip seal storage groove 81 is a sliding partition ring 78. A plurality of communication passages 82 and 83 communicating with the inner region of the orbiting scroll 13 are provided.

  As shown in FIG. 2, since the openings on the sliding partition ring 78 side of the plurality of communication passages 82 and 83 are open to the high pressure portion 30, the pressure difference between the high pressure portion 30 and the bottom surface of the chip seal storage groove 81 is caused. The oil 6 of the high-pressure unit 30 is supplied to the bottom surface of the chip seal storage groove 81.

  With this configuration, the oil 6 in the high-pressure unit 30 is supplied to the space formed in the gap on the back surface of the chip seal storage groove 81 and the chip seal 80 by the communication passages 82 and 83, and from the discharge hole to the suction hole. Oil 6 is supplied to the entire compression space.

  During operation, the high pressure oil 6 is guided from a plurality of locations from the inner region of the sliding partition ring 78 to the bottom surface of the tip seal storage groove 81, and the entire tip seal 80 is surely pressed against the fixed scroll 12 by the pressure. In particular, during a high differential pressure operation, leakage in the compression chamber can be reduced, and a highly efficient scroll compressor can be realized.

  In addition, during high differential pressure operation, oil is supplied from the inner region of the high-pressure sliding partition ring 78 to the bottom surface of the chip seal storage groove 81, and an appropriate amount of oil 6 overflows from the chip seal storage groove 81 to the compression chamber 15. High reliability can be realized because it can also be supplied to the Hanes last surface which is relatively slid.

(Embodiment 2)
In the scroll compressor according to the second embodiment of the present invention, a part of the communication passages 82 and 83 is a narrow hole having a throttle effect.

  FIG. 3 is an enlarged cross-sectional view of a main part of the compression mechanism unit. A part of the communication passages 82 and 83 is a narrow hole 84 having a throttling effect.

  Thereby, it is possible to adjust the amount of oil 6 supplied from the high pressure portion 30 that is the inner region of the sliding partition ring 78 to the bottom surface of the chip seal storage groove 81, and to reduce loss due to suction heating and oil compression, Leakage loss in the compression chamber 15 can be reduced, and a highly efficient scroll compressor can be realized.

(Embodiment 3)
In the scroll compressor according to the third embodiment of the present invention, the radial clearance ΔW between the tip seal storage groove 81 and the tip seal 80 is set in a range of 0.05 to 0.10 times the thickness W of the tip seal. is there.

  FIG. 4 is an enlarged cross-sectional view of a main part of the wrap 13 b of the orbiting scroll 13. By setting the radial clearance ΔW between the tip seal storage groove 81 and the tip seal 80 to be 0.05 times or more the thickness W of the tip seal, even if the tip seal 80 is thermally expanded during operation, the sliding partition ring 78 The plurality of high pressures led from the bottom surface of the chip seal storage groove 81 from the inner region of the chip seal ensure that the entire chip seal 80 is pressed against the fixed scroll 12, thereby reducing leakage in the compression chamber 15 and high efficiency. A simple scroll compressor can be realized. Further, since an appropriate amount of oil 6 overflowing from the radial clearance ΔW between the tip seal storage groove 81 and the tip seal 80 to the compression chamber 15 can be supplied also to the Hanes last surface having relatively severe sliding, high reliability is achieved. Can be realized. By setting the pressure to 0.10 or less, oil is supplied from the inner region of the high-pressure sliding partition ring 78 to the bottom surface of the chip seal storage groove 81, and the high-temperature oil 6 is reduced in diameter between the chip seal storage groove 81 and the chip seal 80. By suppressing the amount of overflow from the directional clearance ΔW into the compression chamber 15, suction heating and oil compression can be suppressed, leakage loss in the compression chamber 15 can be reduced, and a highly efficient scroll compressor can be realized.

(Embodiment 4)
In the scroll compressor according to the fourth embodiment of the present invention, the axial clearance ΔH between the tip seal storage groove 81 and the tip seal 80 is 0 to 0.06 times the thickness H of the tip seal 80.

  As a result, the high-pressure oil is filled in the axial clearance ΔH between the tip seal storage groove 81 and the tip seal 80, and the entire tip seal 80 is surely pressed against the fixed scroll, so that leakage in the compression chamber 15 can be reduced. A highly efficient scroll compressor can be realized. And, by setting it to 0.06 times or less, an appropriate amount of oil 6 is guided from the inner region of the sliding partition ring 78 to the bottom surface of the chip seal storage groove 81 and is not excessively supplied to the compression chamber 15. Performance degradation due to suction heating and oil compression can be suppressed.

(Embodiment 5)
In the scroll compressor according to the fourth embodiment of the present invention, a spring member 85 is disposed between the tip seal storage groove 81 and the tip seal 80.

  FIG. 5 is an enlarged cross-sectional view of a main part of the wrap 13 b of the orbiting scroll 13. As a result, the entire area of the tip seal 80 is more reliably pressed against the fixed scroll 12 by the spring force, leakage in the compression chamber 15 can be reduced, and a highly efficient scroll compressor can be realized.

(Embodiment 6)
The scroll compressor according to the fifth embodiment of the present invention uses carbon dioxide as a working refrigerant. Since the carbon dioxide refrigerant is a high differential pressure refrigerant, an excessive pressing force is generated on the surface on which the end plate 13a of the orbiting scroll 13 and the wrap end 12b of the fixed scroll 12 slide, so that the sliding loss increases. Or it will cause galling and abnormal wear. Also, when carbon dioxide refrigerant is used, the pressure difference between the discharge pressure and the suction pressure of the compressor is about 7 to 10 times higher than the pressure difference of the conventional refrigeration cycle using chlorofluorocarbon as a refrigerant. Furthermore, the performance was reduced. According to the first to fourth embodiments of the present invention, an appropriate amount of the oil 6 of the high-pressure portion 30 in the inner region of the sliding partition ring 78 is guided to the bottom surface of the chip seal storage groove 81, so that an appropriate amount is also introduced into the compression chamber. The oil 6 can be guided to reduce the leakage loss in the compression chamber without any deterioration in performance due to suction heating, and a highly efficient and highly reliable scroll compressor can be realized. In addition, the sliding loss can be reduced, and the good lubrication by the oil 6 can suppress galling and abnormal wear on the sliding surface, thereby realizing a highly reliable scroll compressor.

  As described above, the scroll compressor according to the present invention can improve the compression efficiency even under high differential pressure operation, and the air scroll compressor, the vacuum pump, the scroll type expansion can be realized without limiting the working fluid to the refrigerant. It can also be applied to the use of scroll fluid machines such as machines.

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 Sectional drawing of the compression mechanism part of the scroll compressor in Embodiment 2 of this invention Sectional drawing of the lap part of the turning scroll of the scroll compressor in Embodiment 3 and 4 of this invention Sectional drawing of the lap part of the turning scroll of the scroll compressor in Embodiment 5 of this invention Sectional view of a conventional scroll compressor

Explanation of symbols

6 Oil 11 Main bearing member 12 Fixed scroll 12a End plate 12b Wrap 13 Orbiting scroll 13a End plate 13b Wrap 14 Rotation restricting mechanism 15 Compression chamber 17 Suction port 29 Back pressure space 30 High pressure part 31 High pressure space 78 Sliding partition ring 80 Tip seal 81 Tip Seal storage groove 82, 83 Communication path 84 Narrow hole 85 Spring

Claims (6)

By engaging the fixed scroll and the orbiting scroll where the spiral wrap rises from the end plate, and moving the orbiting scroll along a circular orbit under the regulation of rotation, it moves while changing the volume, so that suction, compression, A compression chamber for discharging is formed, and a ring-shaped groove is provided in a bearing member that substantially supports the orbiting scroll and the back side of the end plate, and a high pressure is applied to the bearing member and the central part on the back side of the end plate by lubricating oil. The high pressure portion to be applied and the high pressure portion are partitioned by a ring-shaped sliding partition ring having a joint portion attached to the groove portion, and a predetermined pressure lower than that of the high pressure portion is applied to the outer peripheral portion of the rear surface of the orbiting scroll end plate In the scroll compressor provided with a back pressure space, a tip seal storage groove for storing the tip seal is provided at the tip of the spiral wrap of the orbiting scroll. Scroll compressor bottom of the tip seal storage groove, characterized in that a communicating passage communicating with the inner region of the sliding partition rings plurality installed inside of the orbiting scroll. The scroll compressor according to claim 1, wherein a part of the communication path is a narrow hole having a throttling effect. 3. The scroll compressor according to claim 1, wherein a radial clearance between the tip seal storage groove and the tip seal is in a range of 0.05 to 0.10 times the thickness of the tip seal. The scroll compressor according to any one of claims 1 to 3, wherein an axial clearance between the tip seal storage groove and the tip seal is 0 to 0.06 times a thickness of the tip seal. The scroll compressor according to any one of claims 1 to 4, wherein a spring member is disposed between the tip seal storage groove and the tip seal. The scroll compressor according to any one of claims 1 to 5, wherein carbon dioxide is used as a working refrigerant.

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