JP2005048666A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the reliability by using a novel oil supplying mechanism for stably supplying lubricating oil to sliding portions. <P>SOLUTION: This scroll compressor comprises a first liquid reservoir space provided in the surface of a fixed spiral part sliding with a rotary spiral part and a second liquid reservoir space provided in the surface of a rotary spiral vane sliding with the rotary spiral part for intermittently communicating with the first liquid reservoir space and a suction space with the rotating motion of the rotary spiral part. A passage is provided in the rotary spiral part for intermittently communicating with the second liquid reservoir space and the first liquid reservoir space. A third oil supplying means is provided for intermittently communicating with the suction space of a compression space through a back pressure chamber with the rotating motion of the rotary spiral part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a scroll compressor.

  As the refrigerating and air-conditioning hermetic compressors, there are a reciprocating type, a rotary type, and a scroll type, and any type has been used in the field of refrigeration and air conditioning for home use and business use. Among them, a compressor in which a compression mechanism and an electric mechanism are housed in a container is represented by a so-called hermetic compressor intended for soundproofing and maintenance-free, and a scroll compressor and a rotary compressor are mainly used. In general, a scroll compressor forms a compression chamber between a fixed spiral part and a swirl spiral part that rise from the end plate and a swirl vortex part. The compression chamber moves while changing the volume when swirling along, and performs suction, compression, and discharge, and applies a predetermined back pressure to the outer periphery of the swirl swirl part and the back of the swirl wrap with lubricating oil, The swirl spiral part is prevented from being overturned away from the fixed spiral part.

  A scroll compressor according to the prior art is taken as an example. FIG. 8 is a cross-sectional view of the scroll compressor.

  This is a scroll compressor in which an electric motor 3 and a compression mechanism section 2 are disposed in a sealed container 1. The electric motor 3 includes a stator 4 fixed inside the sealed container 1 and a rotor 5 rotatably supported inside the stator 4, and a crankshaft 6 is coupled to the rotor 5 in a penetrating state. . One end of the crankshaft 6 is rotatably supported by a bearing 8 fixed to a bearing component 7 that constitutes a part of the compression mechanism section 2. An eccentric portion 9 that performs eccentric motion with respect to the crankshaft 6 is provided at the tip of the crankshaft 6 supported by the bearing 8. On the other hand, a plurality of compression spaces are formed by meshing the fixed swirl component 10 and the swirl swirl component 11, and the rotation constraining component 12 of the swirl swirl component 11 is provided to prevent rotation, and the eccentric swirl component 11 is formed by the eccentric portion 9. By causing only the swivel motion through the swivel bearing 13 joined to the swirl spiral part 11, the refrigerant space or the like is sucked from the suction port 13 by moving the compression space toward the center of the swirl while reducing the volume, Compress. The compressed refrigerant gas or the like passes through the discharge port 15 and is discharged into the sealed container inner space 16. The other end of the crankshaft 6 is supported by a bearing part 17, and a positive displacement pump 18 is provided at the other end of the crankshaft 6. The positive displacement pump 18 extends from the lubricating oil reservoir 19 to the crankshaft. 6, the bearing 13 is lubricated and cooled via the lubricating oil reservoir 21 at the upper part of the eccentric portion 9 through the oil supply path 20 for supplying the lubricating oil provided at the center of the axial direction 6, and the bearing through the lubricating oil reservoir 22. After lubricating 8, recirculate.

  On the other hand, as a first oil supply means, a part of the lubricating oil supplied to the lubricating oil reservoir 21 passes through the elongated hole 23 provided in the swirl spiral part 11 and is supported by the swivel end plate 25 and the bearing through the throttle hole 24. The pressure is reduced and supplied to a back pressure chamber 29 constituted by a recess 26 provided in the component 7, an upper surface 27 of the fixed spiral component 10, and a seal member 28. The seal member 28 serves as a seal between the lubricating oil reservoir 22 and the back pressure chamber 29 which are high pressure portions. The back pressure chamber 29 is provided with a rotation restraint component 12 and is lubricated by lubricating oil supplied to the back pressure chamber 29.

  The back pressure chamber 29 must always have a back pressure sufficient to prevent the swirl spiral component 11 from being pulled away from the fixed spiral component 10. However, when this back pressure becomes excessive, the swirl spiral component 11 is strongly pressed against the fixed spiral component 10, leading to abnormal wear of the sliding portion of the swirl spiral component 11 and the fixed spiral component 10 and an increase in input. For this reason, it is necessary to always keep the back pressure constant. Therefore, a back pressure adjustment mechanism 31 is provided. The back pressure adjusting mechanism 31 is installed in a passage communicating from the back pressure chamber 29 through the inside of the fixed spiral component 10 to the suction space 30, and the pressure of the back pressure chamber 29 is set as a second oil supply means. When the pressure becomes higher, the pressure adjusting mechanism 31 operates to supply the lubricating oil in the back pressure chamber 29 to the suction space 30, and the pressure in the back pressure chamber 29 is kept substantially constant and supplied to the suction space 30. The lubricated oil is guided to the compression space and plays a role of a seal that prevents leakage of refrigerant gas and the like during compression and a role of lubricating the contact surface between the fixed spiral component 10 and the swirl spiral component 11.

  However, in the case of the above-mentioned conventional scroll compressor, since the pressure difference between the discharge pressure and the suction pressure is small and the pressure in the back pressure chamber becomes lower than the set pressure for a while after the start of the compressor, the back pressure adjustment is performed. The mechanism does not operate, and the lubricating oil in the back pressure chamber is not supplied to the suction space of the compression chamber. For this reason, the lubricating oil is not supplied to the sliding portions of the fixed spiral component and the swirl spiral component, which has a problem in reliability.

  Therefore, the present invention aims to improve reliability by using a new oil supply mechanism and stably supplying lubricating oil to the sliding portion.

  The scroll compressor according to claim 1, wherein a fixed spiral member having a fixed spiral blade and a fixed end plate, a swirl spiral member having a swirl spiral blade and a swivel end plate, and the fixed spiral blade and the swirl spiral blade are engaged with each other. A plurality of compression spaces formed, a back pressure chamber provided on the opposite side of the swirl spiral blade surface of the swirl spiral member, a high pressure space and an intermediate pressure space in which the back pressure chamber is partitioned by a seal member, The first oil supply means for supplying the lubricating oil supplied to the high pressure space to the intermediate pressure space, and the pressure of the back pressure chamber is adjusted by supplying the lubricating oil supplied to the intermediate pressure space to the suction space. A scroll compressor having a second oil supply means having a pressure adjusting mechanism, wherein the lubricant supplied to the intermediate pressure space is supplied to the suction space via a throttle portion. Characterized by comprising a.

  The scroll compressor according to claim 2, wherein a fixed spiral member having a fixed spiral blade and a fixed end plate, a swirl spiral member having a swirl spiral blade and a swivel end plate, and the fixed spiral blade and the swirl spiral blade are engaged with each other. A plurality of compression spaces formed, a back pressure chamber provided on the opposite side of the swirl spiral blade surface of the swirl spiral member, a high pressure space and an intermediate pressure space in which the back pressure chamber is partitioned by a seal member, A first oil supply means for supplying the lubricating oil supplied to the high pressure space to the intermediate pressure space via the throttle portion; and the back pressure by supplying the lubricating oil supplied to the intermediate pressure space to the suction space. A scroll compressor comprising a second oil supply means having a pressure adjusting mechanism for adjusting the pressure in the chamber, wherein the lubricating oil supplied to the high pressure space is supplied to the suction space via a throttle portion. Characterized by comprising a fourth oil supply means.

  The scroll compressor according to claim 3 is the scroll compressor according to claim 1, wherein the fixed swirl part slides with the swirl swirl part on the first liquid pool space and swirl movement of the swirl swirl part. A second liquid pool space and a first liquid pool space on a surface that slides with the swirl spiral part of the swirl spiral blade so as to intermittently communicate with the first liquid pool space and the suction space. A passage that communicates intermittently with the swirl spiral component, and the third oil supply means that intermittently communicates from the intermediate pressure space to the suction space of the compression space by the swirl motion of the swirl spiral component. It is characterized by.

  According to a fourth aspect of the present invention, the scroll compressor according to the second aspect of the present invention is the scroll compressor according to the second aspect, wherein a first liquid pool space and a swirling motion of the swirl swirl component are provided on a surface of the fixed swirl component that slides with the swirl swirl component. A second liquid pool space and a first liquid pool space on a surface that slides with the swirl spiral part of the swirl spiral blade so as to intermittently communicate with the first liquid pool space and the suction space. A passage that communicates intermittently with the swirl spiral component, and the fourth oil supply means that intermittently communicates from the high-pressure space to the suction space of the compression space by a swirling motion of the swirl spiral component. Features.

  The scroll compressor according to claim 5 is the scroll compressor according to claim 1 or 2, wherein the first oil supply means is provided in the orbiting end plate, and the first oil supply is performed by the orbiting motion of the orbiting spiral member. The high-pressure space and the intermediate-pressure space are intermittently communicated by reciprocating the high-pressure space and the intermediate-pressure space side across the seal member through the opening of the means.

  The scroll compressor according to claim 6 is characterized in that in the scroll compressor according to claim 1 or 2, carbon dioxide is used as a refrigerant.

  According to a seventh aspect of the present invention, in the scroll compressor according to the sixth aspect, an oil mainly composed of polyalkylene glycol is used as the lubricating oil.

  As is clear from the above embodiment, since the lubricating oil can be supplied from the intermediate pressure space or the high pressure space to the suction space even at the start of operation, it is possible to lubricate the sliding portions of the fixed and swirl components. And a highly reliable scroll compressor can be realized.

  The scroll compressor according to the first embodiment of the present invention comprises a third oil supply means for supplying the lubricating oil supplied to the intermediate pressure space to the suction space of the compression space via the throttle portion. Is. According to this configuration, since the lubricating oil can be supplied from the intermediate pressure space to the suction space of the compression space even at the start of operation, the sliding portion of the fixed spiral component and the swirl spiral component can be lubricated, and the reliability A highly efficient scroll compressor can be realized.

  The scroll compressor according to the second embodiment of the present invention includes a fourth oil supply means for supplying the lubricating oil supplied to the high-pressure space to the suction space of the compression space via the throttle portion. It is. According to this configuration, since the lubricating oil can be supplied from the high-pressure space to the suction space of the compression space even at the start of operation, the sliding portion of the fixed spiral component and the swirl spiral component can be lubricated, and the reliability High scroll compressor can be realized.

  The scroll compressor according to the third embodiment of the present invention is the scroll compressor according to the first embodiment of the present invention, wherein the first liquid pool space is formed on the surface of the fixed spiral component that slides with the swirl spiral component. The second liquid pool space and the first liquid pool space on the surface of the swirl swirl blade sliding with the swirl swirl component so as to intermittently communicate with the first liquid pool space and the suction space by the swirl movement of the swirl swirl component, A passage that communicates intermittently with the liquid reservoir space is provided in the swirl spiral component, and third oil supply means is provided that intermittently communicates from the intermediate pressure space to the suction space of the compression space by the swirl motion of the swirl spiral component. And According to this configuration, since the lubricating oil can be supplied from the intermediate pressure space to the suction space of the compression space even when the operation is started, the sliding portion of the fixed spiral component and the swirl spiral component can be lubricated. Further, the amount of lubricating oil supplied to the suction space can be easily controlled by the volumes of the first liquid reservoir space and the second liquid reservoir space. Therefore, a scroll compressor with high reliability and performance can be realized.

  A scroll compressor according to a fourth embodiment of the present invention is the scroll compressor according to the second embodiment of the present invention, wherein a first liquid pool space is formed on a surface of the fixed spiral component that slides with the swirl spiral component. The second liquid pool space and the first liquid pool space on the surface of the swirl swirl blade sliding with the swirl swirl component so as to intermittently communicate with the first liquid pool space and the suction space by the swirl movement of the swirl swirl component, A passage that communicates intermittently with the liquid pool space is provided in the swirl spiral component, and fourth oil supply means is provided that intermittently communicates from the high-pressure space to the suction space of the compression space by the swirl motion of the swirl spiral component. To do. According to this configuration, since the lubricating oil can be supplied from the high-pressure space to the suction space of the compression space even when the operation is started, the sliding portions of the fixed spiral component and the swirl spiral component can be lubricated. Further, the amount of lubricating oil supplied to the suction space can be easily controlled by the volumes of the first liquid reservoir space and the second liquid reservoir space. Therefore, a scroll compressor with high reliability and performance can be realized.

  A scroll compressor according to a fifth embodiment of the present invention is the scroll compressor according to the first or second embodiment of the present invention, wherein the first oil supply means is provided on the swivel end plate, and the swirl spiral member is The high pressure space and the intermediate pressure space are intermittently communicated by reciprocating the high pressure space and the intermediate pressure space side across the seal member through the opening of the first oil supply means by a turning motion. According to this configuration, an appropriate amount of high-pressure lubricating oil can be supplied to the intermediate pressure chamber and the suction chamber, and a scroll compressor with high performance and reliability can be realized.

  A scroll compressor according to a sixth embodiment of the present invention is characterized in that carbon dioxide is used as a refrigerant in the scroll compressor according to the first or second embodiment of the present invention. Since this scroll compressor is a carbon dioxide refrigerant, the differential pressure between the high pressure side and the low pressure side is large, and the intermediate pressure is set high, so that the discharge pressure and suction pressure at the start of operation and low differential pressure operation are reduced. Since the pressure difference is small and the pressure in the back pressure chamber is lower than the set pressure, the back pressure chamber is closed and the lubricating oil in the back pressure chamber is not supplied to the suction chamber. Even during start-up and low differential pressure operation, lubricating oil can always be supplied to the suction space of the compression space, so the sliding part of the fixed and swirl parts can be lubricated with an appropriate amount of lubricating oil. A highly reliable scroll compressor can be realized.

  A scroll compressor according to a seventh embodiment of the present invention is characterized in that, in the scroll compressor according to the sixth embodiment of the present invention, an oil mainly composed of polyalkylene glycol is used as the lubricating oil. To do. Since this scroll compressor is an oil mainly composed of a polyalkylene glycol that is hardly compatible with a carbon dioxide refrigerant, the oil viscosity is high at the start of operation, etc. Although it takes a long time to supply the lubricating oil to the suction space, in this configuration, since the lubricating oil can be supplied to the suction space of the compression space in a short time, the sliding between the fixed swirl part and the swirl swirl part The part can be lubricated with an appropriate amount of lubricating oil, and a highly reliable scroll compressor can be realized.

  Each embodiment will be described with reference to the drawings.

(Example 1)
FIG. 1 is a cross-sectional view of one embodiment of a scroll compressor according to the present invention. In this figure, in order to clarify the difference between the scroll compressor of this embodiment and the conventional scroll compressor, the same reference numerals are given to the same or functionally equivalent parts as in FIG. An electric motor 3 and a compression mechanism unit 2 are disposed inside the sealed container 1. The electric motor 3 includes a stator 4 fixed inside the sealed container 1 and a rotor 5 rotatably supported inside the stator 4, and a crankshaft 6 is coupled to the rotor 5 in a penetrating state. . One end of the crankshaft 6 is rotatably supported by a bearing 8 fixed to a bearing component 7 that constitutes a part of the compression mechanism section 2. An eccentric portion 9 that performs eccentric motion with respect to the crankshaft 6 is provided at the tip of the crankshaft 6 supported by the bearing 8. On the other hand, a plurality of compression spaces are formed by meshing the fixed swirl component 10 and the swirl swirl component 11, and the rotation constraining component 12 of the swirl swirl component 11 is provided to prevent rotation, and the eccentric swirl component 11 is formed by the eccentric portion 9. By causing only the swivel motion through the swivel bearing 13 joined to the swirl spiral component 11, the refrigerant space or the like is sucked from the suction port 14 by moving the compression space toward the center of the swirl while reducing the volume, Compress. The compressed refrigerant gas or the like passes through the discharge port 15 and is discharged into the sealed container inner space 16. The other end of the crankshaft 6 is supported by a bearing component 17.

  Further, the other end side of the drive shaft 6 is supported by a bearing component 17, and a positive displacement pump 18 is provided at the tip of the other end side of the drive shaft 6. The positive displacement pump 18 is driven from the lubricating oil reservoir 19. The swivel bearing 13 is lubricated and cooled via a lubricating oil reservoir 21 at the top of the crankshaft 9 via an oil supply path 20 for supplying lubricating oil provided in the axial center of the shaft 6, and then passed through a lubricating oil reservoir 22. After the bearing 8 is lubricated, it returns to the lubricating oil reservoir 19.

  On the other hand, a part of the lubricating oil supplied to the lubricating oil reservoir 21 as the first oil supply means is from a throttle portion 24 configured by a narrow hole via a long hole 23 provided in the inside of the swirl spiral component 11. The pressure is reduced and supplied to a back pressure chamber 29 composed of a swivel end plate 25, a recess 26 provided in the bearing component 2, an upper surface 27 of the fixed spiral component 10, and a seal member 28. The seal member 28 serves as a seal between the lubricating oil reservoir 22 and the back pressure chamber 29 which are high pressure portions. The back pressure chamber 29 is provided with a rotation restraint component 12 and is lubricated by lubricating oil supplied to the back pressure chamber 29. As the lubricating oil supplied to the back pressure chamber 29 accumulates, the pressure in the back pressure chamber 29 rises. In order to keep the pressure constant, the pressure between the back pressure chamber 29 and the suction space 30 that generates the compression space 32 is increased. The pressure adjusting mechanism 31 is configured so that when the pressure in the back pressure chamber 29 becomes higher than the pressure set as the second oil supply means, the pressure adjusting mechanism 31 is activated and the lubricating oil in the back pressure chamber 29 is sucked into the suction space. 30 and the pressure in the back pressure chamber 29 is kept substantially constant, and the lubricating oil supplied to the suction space 30 is guided to the compression space, and serves as a seal that prevents leakage of refrigerant gas and the like during compression. The contact surface of the fixed spiral component 10 and the swirl spiral component 11 is lubricated.

  Further, a part of the lubricating oil in the back pressure chamber 29 as the third oil supply means is supplied to the suction space 30 by being depressurized from the throttle portion 33 constituted by a narrow hole provided in the fixed spiral component 10. The

  With such a configuration, the pressure difference between the discharge pressure and the suction pressure is small for a while after activation, and the pressure in the back pressure chamber 29 becomes lower than the set pressure. Therefore, the back pressure adjustment mechanism 31 is activated. The lubricating oil in the back pressure chamber 29 is not supplied to the suction space 30 via the back pressure adjustment mechanism 31, but the lubricating oil in the back pressure chamber 29 is provided inside the fixed spiral component 10. Since it is guided to the suction space 30 via the throttle portion 33, it plays a role of lubricating the sliding portion of the fixed spiral component 10 and the swirl spiral component 11, and a highly reliable scroll compressor can be realized.

(Example 2)
FIG. 2 is a cross-sectional view of one embodiment of the scroll compressor according to the present invention. As shown in the figure, the second embodiment differs from the first embodiment in that a part of the lubricating oil supplied to the lubricating oil reservoir 21 as the fourth oil supply means is part of the swirl spiral component 11. This is a configuration in which the pressure is reduced in pressure and supplied to the suction space 30 by the throttle portion 34 constituted by the pores provided inside.

  With such a configuration, the pressure difference between the discharge pressure and the suction pressure is small for a while after activation, and the pressure in the back pressure chamber 29 becomes lower than the set pressure. Therefore, the back pressure adjustment mechanism 31 is activated. The lubricating oil in the back pressure chamber 29 is not supplied to the suction space 30 via the back pressure adjusting mechanism 31, but a part of the lubricating oil supplied to the lubricating oil reservoir 21 is part of the swirl spiral component 11. Since the pressure is reduced and guided to the suction space 30 via the constricted portion 34 provided in the interior, it plays a role of lubricating the sliding portion of the fixed spiral component 10 and the swirl spiral component 11, and a highly reliable scroll compressor. Can be realized.

(Example 3)
FIG. 3 is a cross-sectional view of an embodiment of the scroll compressor according to the present invention, and FIG. 4 is a partial cross-sectional view of the compression mechanism showing the oil supply mechanism.

  As shown in FIG. 4A, the lubricating oil stored in the back pressure chamber 29 is fixed to the swirl component via a passage 35 provided in the swirl swirl component 11 as the swirl motion of the swirl swirl component 11. It is once stored in a liquid storage space 36 provided on a surface that slides with the 10 swirling spiral components 11. Thereafter, as the swirl swirl component 11 swivels, the lubricant stored in the liquid pool space 36 is provided on the surface of the swirl swirl component 11 that slides with the fixed swirl component 10 as shown in FIG. The liquid is stored in the liquid storage space 37. Further, as the swirl spiral component 11 swivels, the lubricating oil stored in the liquid pool space 37 is supplied to the suction space 30 as shown in FIG.

  With such a configuration, the pressure difference between the discharge pressure and the suction pressure is small for a while after activation, and the pressure in the back pressure chamber 29 becomes lower than the set pressure. Therefore, the back pressure adjustment mechanism 31 is activated. However, the lubricating oil in the back pressure chamber 29 is not supplied to the suction space 30 via the back pressure adjusting mechanism 31, but the lubricating oil in the back pressure chamber 29 is intermittently guided to the suction space 30. Thus, it plays a role of lubricating the sliding portion of the fixed spiral component 10 and the swirl spiral component 11, and a highly reliable scroll compressor can be realized. Further, since the amount of the lubricating oil supplied to the suction space 30 can be easily controlled by the volume of the liquid storage spaces 36 and 37, a large amount of lubricating oil in the back pressure chamber 29, which is an intermediate pressure, enters the low pressure suction space 30. It is possible to prevent performance degradation due to suction heating that occurs due to inflow. It goes without saying that the same effect can be expected even if the passage 35 provided in the swirl spiral part has a throttling effect such as pores.

(Example 4)
FIG. 5 is a cross-sectional view of an embodiment of the scroll compressor according to the present invention, and FIG. 6 is a partial cross-sectional view of the compression mechanism showing the oil supply mechanism.

  As shown in FIG. 6A, the lubricating oil stored in the high-pressure lubricating oil reservoir 21 is fixed to the fixed swirl via a passage 35 provided in the swirl spiral component 11 as the swirl motion of the swirl spiral component 11 is performed. The component 10 is temporarily stored in a liquid storage space 36 provided on a surface that slides with the swirl spiral component 11. Thereafter, as the swirl swirl component 11 swivels, the lubricating oil stored in the liquid pool space 36 is provided on the surface of the swirl swirl component 11 that slides with the fixed swirl component 10 as shown in FIG. The liquid is stored in the liquid storage space 37. Further, as the swirl spiral component 11 swivels, the lubricating oil stored in the liquid pool space 37 is supplied to the suction space 30 as shown in FIG.

  With such a configuration, the pressure difference between the discharge pressure and the suction pressure is small for a while after activation, and the pressure in the back pressure chamber 29 becomes lower than the set pressure. Therefore, the back pressure adjustment mechanism 31 is activated. However, the lubricating oil in the back pressure chamber 29 is not supplied to the suction space 30 via the back pressure adjusting mechanism 31, but the lubricating oil in the lubricating oil reservoir 21 is intermittently guided to the suction space 30. It plays the role which lubricates the sliding part of the fixed spiral component 10 and the turning spiral component 11, and a highly reliable scroll compressor is realizable. Further, since the amount of the lubricating oil supplied to the suction space 30 can be easily controlled by the volume of the liquid storage spaces 36 and 37, the suction heating generated when a large amount of the high-pressure lubricating oil flows into the low-pressure suction space 30. It is possible to prevent performance degradation due to. It goes without saying that the same effect can be expected even if the passage 35 provided in the swirl spiral part has a throttling effect such as pores.

(Example 5)
FIG. 7 is a partial cross-sectional view showing an oil supply mechanism of one embodiment of the scroll compressor according to the present invention. As shown in the figure, in the fifth embodiment, as the first oil supply means, a part of the lubricating oil supplied to the lubricating oil reservoir 21 is passed through the passage 23 by the throttle hole 24 and the seal member 28. That is, the back pressure chamber 29 is intermittently supplied.

  The throttle hole 24 performs a circular motion while straddling the seal member 28 between the lubricating oil reservoir 22 and the back pressure chamber 29. As shown in FIG. 7A, when the throttle hole 24 faces the back pressure chamber 29, the lubricating oil in the lubricating oil reservoir 21 is supplied to the back pressure chamber 29 through the long hole 23 and the throttle hole 24. On the other hand, as shown in FIG. 7B, when the throttle hole 24 faces the seal member 28 or the lubricating oil reservoir 22, the lubricating oil is not supplied to the back pressure chamber 29. Therefore, the amount of lubricating oil supplied to the back pressure chamber 29 can be adjusted by changing the time ratio at which the throttle hole 24 faces the back pressure chamber 29. In this case, the diameter of the locus of the throttle hole 24 can be varied by adjusting the formation position, and the time ratio facing the back pressure chamber 29 can be adjusted. Further, there is no problem as in the case of increasing the length.

  The throttle hole 24 intermittently communicates with the back pressure chamber 29, and instead of supplying lubricating oil to the back pressure chamber 29 through the long hole 23, the throttle hole 24 intermittently enters the liquid pool space 22. Of course, the same effect can be obtained by using a configuration in which lubricating oil is supplied to the back pressure chamber 29 through the long hole 23.

  With this configuration, in addition to the operation in each of the embodiments described above, an appropriate amount of lubricating oil can be supplied to the compression chamber near the suction hole, and a high-performance and low-cost scroll compressor can be realized.

  Further, when high pressure carbon dioxide is used as a refrigerant, the pressure difference between the high pressure side and the low pressure side is large, and the pressure in the back pressure chamber 29, which is an intermediate pressure, is set high. The pressure difference between the discharge pressure and the suction pressure is small, and the pressure in the back pressure chamber 29 is lower than the set pressure. Therefore, the state in which the lubricating oil in the back pressure chamber 29 is not supplied to the suction space 30 continues for a long time when the back pressure adjusting mechanism 31 is not operated. Even during operation, since the lubricating oil can be always supplied to the suction space 30 of the compression space, the sliding portion of the fixed spiral component 10 and the swirl spiral component 11 can be lubricated with an appropriate amount of lubricating oil, and the reliability can be improved. A high scroll compressor can be realized.

  In addition, when a lubricating oil mainly composed of polyalkylene glycol that is hardly compatible with a carbon dioxide refrigerant is used, the viscosity of the lubricating oil increases at the start of operation, so that the suction space of the compression space from the lubricating oil reservoir at the bottom of the compressor However, according to the configuration of the above embodiment, the lubricating oil is supplied to the suction space 30 of the compression space in a short time, so that the fixed spiral component 10 and the swirl spiral component are supplied. The 11 sliding portions can be lubricated with an appropriate amount of lubricating oil, and a highly reliable scroll compressor can be realized.

Sectional drawing of the scroll compressor which shows 1st Example of this invention Sectional drawing of the scroll compressor which shows 2nd Example of this invention Sectional drawing of the scroll compressor which shows 3rd Example of this invention Partial sectional view of a compression mechanism of a scroll compressor showing a third embodiment of the present invention Sectional drawing of the scroll compressor which shows 4th Example of this invention Partial sectional view of a compression mechanism of a scroll compressor showing a fourth embodiment of the present invention Partial sectional view of a compression mechanism of a scroll compressor showing a fifth embodiment of the present invention Diagram showing a conventional scroll compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism part 7, 17 Bearing part 8 Bearing 9 Eccentric part 10 Fixed vortex part 11 Rotating spiral part 12 Rotation restraint part 13 Rotating bearing 19, 21, 22 Lubricating oil reservoir 20 Oil supply path 23 Elongated hole 24 Restriction hole 28 Seal member 29 Back pressure chamber 30 Suction space 31 Pressure adjustment mechanism 32 Compression space 33, 34, 35 Restriction portion 36 First liquid pool space 37 Second liquid pool space

Claims (7)

A fixed swirl member having a fixed swirl blade and a fixed end plate, a swirl swirl member having a swirl swirl blade and a swivel end plate, a plurality of compression spaces formed by meshing the fixed swirl blade and the swirl swirl blade, and A back pressure chamber provided on the opposite side of the swirl spiral blade surface of the swirl spiral member, a high pressure space and an intermediate pressure space in which the back pressure chamber is partitioned by a seal member, and lubricating oil supplied to the high pressure space A second oil supply having a first oil supply means for supplying the intermediate pressure space and a pressure adjusting mechanism for adjusting the pressure of the back pressure chamber by supplying the lubricating oil supplied to the intermediate pressure space to the suction space. A scroll compressor comprising means, comprising: a third oil supply means for supplying lubricating oil supplied to the intermediate pressure space to the suction space via a throttle portion. Compressor. A fixed swirl member having a fixed swirl blade and a fixed end plate, a swirl swirl member having a swirl swirl blade and a swivel end plate, a plurality of compression spaces formed by meshing the fixed swirl blade and the swirl swirl blade, and A back pressure chamber provided on the opposite side of the swirling spiral blade surface of the swirling spiral member, a high pressure space and an intermediate pressure space in which the back pressure chamber is partitioned by a seal member, and a lubricating oil supplied to the high pressure space is throttled A first oil supply means for supplying the intermediate pressure space to the intermediate pressure space, and a pressure adjusting mechanism for adjusting the pressure of the back pressure chamber by supplying the lubricating oil supplied to the intermediate pressure space to the suction space. A scroll compressor having a second oil supply means having a fourth oil supply means for supplying the lubricating oil supplied to the high-pressure space to the suction space via a throttle portion. Scroll compressor. The third oil supply means includes a first liquid pool space on a surface of the fixed swirl part that slides with the swirl swirl part, and the first liquid sump space and the suction space by swirl movement of the swirl swirl part. A second liquid pool space and a passage intermittently communicating with the first liquid pool space on the surface of the swirl spiral blade that slides with the swirl spiral component so as to intermittently communicate with the swirl spiral blade. 2. The scroll compressor according to claim 1, wherein the scroll compressor is provided in a component and intermittently communicates from the intermediate pressure space to the suction space of the compression space by a swiveling motion of the swirl spiral component. The fourth oil supply means includes a first liquid pool space on a surface of the fixed swirl part that slides with the swirl swirl part, and the first liquid sump space and the suction space by swirl movement of the swirl swirl part. A second liquid pool space and a passage intermittently communicating with the first liquid pool space on the surface of the swirl spiral blade that slides with the swirl spiral component so as to intermittently communicate with the swirl spiral blade. 3. The scroll compressor according to claim 2, wherein the scroll compressor is provided in a component and intermittently communicates from the high-pressure space to the suction space of the compression space by a swirling motion of the swirl spiral component. The first oil supply means is provided on the swivel end plate, and reciprocates between the high-pressure space and the intermediate-pressure space side across the seal member through the opening of the first oil supply means by the revolving motion of the swirl spiral member. 3. The scroll compressor according to claim 1, wherein the high-pressure space and the intermediate-pressure space are intermittently communicated with each other. The scroll compressor according to claim 1 or 2, wherein carbon dioxide is used as a refrigerant. The scroll compressor according to claim 6, wherein an oil mainly composed of polyalkylene glycol is used as the lubricating oil.

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