JP2005048689A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reliable scroll compressor not deteriorating refrigerating cycle efficiency in which quantity of lubricating oil of a turning bearing and a bearing does not decrease by increasing lubricating oil supplied to a low pressure space if pressure difference between the delivery pressure and the low pressure becomes large when lubricating oil is supplied to a compression mechanism part from a lubricating oil reservoir at a bottom of a hermetic vessel of a compressor by using a positive displacement pump, and branches to two routes, the one supplying lubricating oil to a low pressure space via a back pressure chamber using a restrictor and the other lubricating the turning bearing and the bearing. <P>SOLUTION: A space for reserving lubricating oil lubricating the bearing is provided in an electric motor side of the bearing and the space for reserving lubricating oil is isolated from a space in a lower side of the bearing by a seal part. A passage communicating the space for reserving lubricating oil and the lower part space of the electric motor is provided. Lubricating oil supplied to the bearing from a lead groove of a drive shaft can be discharged to a lower part of the electric motor via a passage communicating to the lower part space of the electric motor without mixing with refrigerant gas by the above mentioned structure. Consequently, take-out of lubricating oil to refrigerating cycle can be reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a scroll compressor used in a refrigeration cycle apparatus or the like.

  FIG. 6 is a cross-sectional view of a conventional scroll compressor. An electric motor 3 and a compression mechanism 2 are disposed in the sealed container 1. The electric motor 3 includes a stator 4 fixed inside the hermetic container 1 and a rotor 5 supported rotatably inside the stator 4, and a drive shaft 6 is coupled to the rotor 5 in a penetrating state. . One end of the drive shaft 6 is rotatably supported by a bearing 8 fixed to a bearing component 7 constituting a part of the compression mechanism portion 2. A crankshaft 9 that performs an eccentric motion with respect to the drive shaft 6 is provided at the tip of the drive shaft supported by the bearing 8.

  On the other hand, a plurality of compression spaces are formed by meshing the fixed spiral component 10 and the swirl swirl component 11, and the rotation restraint component 12 of the swirl swirl component 11 is provided to prevent rotation. By causing only the swivel motion through the swivel bearing 13 joined to the swirl spiral part 11, the refrigerant space and the like are 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 to the muffler space 38. The discharged gas is discharged to the rotor upper space 35 through the communication hole 39. Since the cylindrical cover 40 is mounted around the rotor upper space, it does not flow into the stator upper space 16 but flows to the motor lower space 37 via the rotor passage 36 and rises outside the stator 4 to move the stator upper space. After passing 16, it is discharged from the discharge pipe 41 to the refrigeration cycle through the sealed container upper space 40.

  The other end 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 of the drive shaft 6. The positive displacement pump 18 extends from the lubricating oil reservoir 19 to the drive shaft. 6 enters the lead groove A33 formed in the crankshaft 9 through the lubricating oil reservoir 21 at the upper part of the crankshaft 9 through the oil supply path 20 for supplying the lubricating oil provided in the center in the axial direction of the slewing bearing 13. After being lubricated and cooled, it enters the lead groove B 34 formed in the drive shaft 6 through the lubricating oil reservoir 22, lubricates the bearing 8, and then is discharged into the rotor upper space 35. The lubricating oil discharged to the rotor upper space 35 is discharged to the motor lower space through the rotor passage 36 while being mixed with the refrigerant gas. The lubricating oil discharged into the motor lower space is separated from the refrigerant gas and returned to the oil reservoir 19 for recirculation.

  On the other hand, a part of the lubricating oil supplied to the lubricating oil reservoir 21 passes through a long hole 23 provided in the swirl spiral part 11 and is a depression provided in the swivel end plate 325 and the bearing part 07 from the throttle part 24. 26, a space 29 formed by the upper surface 27 of the fixed spiral component 10 and the seal member 28 is supplied with reduced pressure. The seal member 28 serves as a seal between the lubricating oil reservoir 22 and the space 29 which are high pressure portions.

In addition, the rotation restraint component 12 is disposed in the space 29, and lubrication is performed with the lubricating oil supplied to the space 29. As the lubricating oil supplied to the space 29 accumulates, the pressure in the space 29 increases. In order to keep the pressure constant, a pressure adjusting mechanism 31 is configured between the space 29 and the suction space 30 that generates the compression space. When the pressure in the space 29 becomes higher than the set pressure, the pressure adjusting mechanism 31 is operated to supply the lubricating oil in the space 29 to the suction space 30, and the pressure in the space 29 is kept almost constant. At the same time, the lubricating oil supplied to the suction space 30 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. Yes. At the same time, the lubricating oil in the space 29 is guided to the suction space while lubricating the sliding surfaces of the end plate of the fixed spiral component and the swirl spiral component (for example, see Patent Document 1).
JP 2001-280252 A

  However, when high speed operation is performed in the above configuration, the amount of lubricating oil supplied from the positive displacement pump 18 increases. The increased lubricating oil is discharged from the lead groove 34 to the rotor upper space 35, but the flow rate of the refrigerant gas flowing from the communication path 39 to the rotor upper space 35 is fast and the rotor 5 rotates fast. The air leaks from the upper gap into the stator upper space 16 and goes out to the refrigeration cycle together with the refrigerant gas. In addition, the lubricating oil discharged to the motor lower space 37 through the rotor passage 36 has a high flow rate of the refrigerant gas mixed therein, so that it cannot be sufficiently separated from the refrigerant gas and goes out to the refrigeration cycle.

  Taking out the lubricating oil to the refrigeration cycle has problems that the lubricating oil in the lubricating oil reservoir 19 is reduced and the reliability of the compressor is lowered and the efficiency of the refrigeration cycle is lowered. An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a scroll compressor that is highly reliable and does not reduce the efficiency of the refrigeration cycle.

  In order to solve the above-mentioned conventional problems, the present invention provides a space for storing lubricating oil that lubricates the bearing on the motor side of the bearing, and the space for storing the lubricating oil is separated from the space below the bearing by a seal portion. Is provided with a passage that communicates the space in which the air is accumulated and the lower space of the electric motor. With the above configuration, the lubricating oil supplied to the bearing from the lead groove of the drive shaft can be discharged to the lower part of the motor without being mixed with the refrigerant gas through a passage communicating with the lower space of the motor, and the take-out of the lubricating oil to the refrigeration cycle is reduced. I can do it.

  According to the present invention, a cylinder covering the periphery of the opening to the motor lower space is attached to a plate fixed to an airtight container that supports the auxiliary bearing. In the above configuration, the lubricating oil discharged from the opening can be received by the cylinder and quickly returned to the lubricating oil reservoir.

  Further, in the present invention, the opening is opened on a shaft that slides with the radial bearing of the auxiliary bearing. In the above configuration, the lubricity of the radial bearing can be improved.

  Further, in the present invention, the opening is opened on a surface that slides with the thrust bearing of the auxiliary bearing. In the above configuration, the lubricity of the thrust bearing can be improved.

  Further, in the present invention, the drive shaft is constituted by a core shaft and a cylinder that wraps the core shaft, and a groove is provided on the core shaft from the same position as the space for storing the lubricating oil of the bearing to the position of the motor lower space, and is positioned at both ends of the groove. A hole connecting the outer periphery of the cylinder and the groove is formed in the cylinder. With the above configuration, it is possible to configure a passage that communicates between the space for storing the lubricating oil of the bearing and the position of the motor lower space without making a long hole in the drive shaft.

  As described above, according to the scroll compressor of the present invention, the lubricating oil discharged from the bearing of the drive shaft can be quickly returned to the oil reservoir at the bottom of the sealed container without mixing with the compressed refrigerant gas. It is possible to reduce the carry-out of lubricating oil to the refrigeration cycle, increase the reliability of the scroll compressor, and prevent the efficiency of the refrigeration cycle from decreasing.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
1 is a cross-sectional view of a scroll compressor according to Embodiment 1 of the present invention. In FIG. 1, the description of the same configuration as in FIG. 6 is omitted. The lead groove 34 provided on the drive shaft is configured not to pass through the lower portion of the bearing. The bearing 8 located at the lower end of the lead groove 34 is formed with a circular groove 43 capable of storing lubricating oil supplied from the lead groove 34 to the bearing 8. A seal member 44 is attached to the lower side of the circular groove 43 so that the lubricating oil does not leak from the circular groove 43 into the rotor upper space 35. The drive shaft 6 located in the circular groove 43 is formed with a passage connecting the circular groove 45, 46 and 47 and the motor lower space 37.

  In such a configuration, the lubricating oil supplied to the lead groove 34 lubricates the bearing 8 and then accumulates in the circular groove 43, and passes through a passage made up of 45, 46 and 47 in order, and is quickly discharged into the motor lower space 37. Is done. Since the lubricating oil that has lubricated the bearing 8 as in the prior art is not discharged into the rotor upper space 35, the lubricating oil is less likely to be mixed with the compressed refrigerant gas, thereby reducing the carry-out of the lubricating oil to the refrigeration cycle.

(Embodiment 2)
FIG. 2 is a cross-sectional view of the scroll compressor according to Embodiment 2 of the present invention. In FIG. 2, the description of the same configuration as in FIG. 1 is omitted. In the present embodiment, a cylindrical part 48 is provided in addition to the first embodiment. The cylindrical part 48 can capture the lubricating oil discharged from the passage 47 and quickly return it to the oil reservoir 19.

(Embodiment 3)
FIG. 3 is a cross-sectional view of the scroll compressor according to Embodiment 3 of the present invention. In FIG. 3, the description of the same configuration as in FIG. 1 is omitted. In this embodiment, in addition to the first embodiment, the position of the passage 47 is opened on the surface of the radial bearing 49 of the auxiliary bearing 17. With this configuration, in addition to the effects of the first embodiment, the radial bearing 49 can be lubricated well.

(Embodiment 4)
FIG. 4 is a cross-sectional view of a scroll compressor according to Embodiment 4 of the present invention. In FIG. 4, the description of the same configuration as in FIG. 3 is omitted. In this embodiment, in addition to the third embodiment, a passage 46 is opened on the surface of the thrust bearing 50 of the auxiliary bearing 17. With this configuration, in addition to the effects of the third embodiment, the thrust bearing 50 can be lubricated well.

(Embodiment 5)
FIG. 5 is a cross-sectional view of a scroll compressor according to Embodiment 5 of the present invention. In FIG. 5, the description of the same configuration as in FIG. 1 is omitted. In this embodiment, the drive shaft 6 is composed of a core shaft 51 and a cylinder 52 that encloses the core shaft 51. The cylinder 52 is fixed to the core shaft 51 by press fitting or shrink fitting. A groove 53 is formed in the core shaft 51 from the same position as the circular groove 43 to the position of the motor lower portion 37. The cylinder 52 has a hole 54 that communicates the groove 53 and the circular groove 43, and a hole 55 that communicates the groove 53 and the motor lower space 37. With this configuration, the lubricating oil accumulated in the circular groove 43 passes through the groove 53 covered with the hole 53 and the cylinder 52 and is discharged from the hole 54 to the lower space of the electric motor. The passage which connects 43 and the motor lower space 37 can be comprised easily.

Sectional drawing of the scroll compressor in Embodiment 1 of this invention Sectional drawing of the scroll compressor in Embodiment 2 of this invention Sectional drawing of the scroll compressor in Embodiment 3 of this invention Sectional drawing of the scroll compressor in Embodiment 4 of this invention Sectional drawing of the scroll compressor in Embodiment 5 of this invention Sectional view of a conventional scroll compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Compression mechanism part 3 Electric motor 6 Drive shaft 8 Bearing 10 Fixed spiral part 11 Turning spiral part 13 Turning bearing 19, 21, 22 Lubricating oil pool 20 Oil supply path 25 Turning end plate 33 Lead groove A
34 Lead groove B
43 Circular groove 45 Passage A
46 Passage B
47 Passage C
48 cylinders 52 cylinders

Claims (5)

A scroll compressor unit and an electric motor unit are housed in a sealed container, and a lubricating oil reservoir is provided for storing lubricating oil at the bottom of the sealed container. The scroll compressor unit has a fixed spiral component having a fixed spiral blade and a fixed end plate. A swirl spiral blade and a swirl spiral part having a swirl end plate are formed to form a plurality of compression spaces, and a rotation restraint part that causes the swirl swirl part to swivel, a drive shaft provided with a crankshaft, and the swirl swirl part And a bearing part having a bearing for supporting the drive shaft, and the drive shaft is disposed near the lower portion of the hermetic container on the opposite side of the electric motor part with respect to the scroll compressor part. A secondary bearing that supports the end and a positive displacement lubricant pump, and the lubricant supplied from the positive displacement lubricant pump is supplied from the end of the drive shaft on the positive displacement lubricant pump side to the crank. In the scroll compressor for lubricating the bearing after lubricating the eccentric bearing through a hole penetrating to the end of the bearing, a space for storing the lubricating oil for lubricating the bearing is provided on the motor portion side of the bearing, and the lubricating oil is stored The scroll compressor is characterized in that the space is separated from the space below the bearing by a seal portion, and a passage is provided to connect the space for storing the lubricating oil and the lower space of the motor portion. The cylinder which covers the circumference | surroundings of the opening part to the said motor lower space of the channel | path which communicates with the said lower space was attached to the plate fixed to the said airtight container which supports the said secondary bearing. Scroll compressor. The scroll compressor according to claim 1, wherein an opening portion of a passage communicating with the lower space is opened in a shaft that slides with a radial bearing of the sub-bearing. The scroll compressor according to claim 1, wherein an opening portion of a passage communicating with the lower space is opened on a surface that slides with a thrust bearing of the auxiliary bearing. The drive shaft is composed of a core shaft and a cylinder surrounding the core shaft, a groove is formed from the position of the space where the lubricating oil is stored in the core shaft to the position of the opening, and the cylinder positioned at both ends of the groove The scroll compressor according to any one of claims 1 to 4, wherein a hole connecting the outer periphery of the cylinder and the groove is formed.

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