JP2014234785A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which an oil groove is provided in a radial direction of a thrust bearing 7a from space 7b inside the thrust bearing, so that an annular flat surface part of the thrust bearing 7a becomes discontinuous at the portion of the radial direction oil groove, and this causes deterioration of bearing performance.SOLUTION: By providing an inside communication passage 7c between a thrust bearing 7a and space 7b inside the thrust bearing, a lubricating oil 13 is supplied to the thrust bearing 7a through the inside communication passage 7c. Thereby, an oil groove from the space 7b inside the thrust bearing to a radial direction of the thrust bearing 7a becomes unnecessary, and the thrust bearing 7a can be configured by a continuous flat surface. Thus, reliability improves and sliding loss reduces.

Description

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

  2. Description of the Related Art Conventionally, a compressor used in an air conditioner, a cooling device, or the like generally includes a compression mechanism unit and an electric motor unit that drives the compression mechanism unit in a casing. The refrigerant gas returned from the refrigeration cycle is compressed by the compression mechanism and fed into the refrigeration cycle. Compressors are classified into several types depending on the compression method, and one of them is a scroll compressor. In addition to the features of low vibration and noise compared to other compression methods, the scroll compressor has the advantage of being able to achieve high output with a relatively small size.

  A partition plate is provided in the sealed container, and the motor and the compression mechanism portion having the fixed scroll and the orbiting scroll are accommodated in the lower low pressure chamber partitioned by the partition plate, and compressed by the compression mechanism portion. There is a scroll compressor having a configuration in which a refrigerant is discharged to an upper high pressure chamber partitioned by a partition plate through a discharge port of a fixed scroll (for example, see Patent Document 1).

  FIG. 9A is a plan view of the main bearing member 38 that supports the rear face of the orbiting scroll of the conventional scroll compressor, and FIG. 9B is a cross-sectional view of the main bearing member 38. In order to lubricate the thrust bearing 38a, the lubricating oil supplied to the thrust bearing inner space 38b is guided to the radial oil groove 38c, the annular oil groove 38d, the outer communication path 38e, and the thrust bearing outer space 38f.

Japanese Patent No. 2133579

  However, in the conventional configuration, in order to lubricate the thrust bearing that supports the rear surface of the end plate of the orbiting scroll, an oil groove is provided in the radial direction of the thrust bearing from the space inside the thrust bearing, and the thrust bearing is provided in the radial oil groove portion. This has the problem that the annular plane becomes discontinuous and the bearing performance deteriorates.

  In order to solve the above problems, the scroll compressor according to the present invention is provided with a partition plate that partitions the inside of the sealed container into a lower low pressure chamber and an upper high pressure chamber, and stores the motor and the compression mechanism in the lower low pressure chamber, The compression mechanism unit is an orbiting scroll formed by standing up a spiral wrap on the end plate, a main bearing member that supports the back of the end plate of the orbiting scroll, and the orbiting scroll combined with the orbiting scroll to erect the spiral wrap on the end plate. The fixed scroll, the drive shaft, and the eccentric shaft provided at one end of the drive shaft are integrally formed, and the eccentric shaft is supported by the cylindrical boss portion of the orbiting scroll, and the main shaft of the drive shaft Is a scroll compressor supported by the main bearing member, and the space in which the cylindrical boss part of the orbiting scroll turns inside the thrust bearing in the main bearing member And space, the said motor upper space outside the thrust bearing and the thrust bearing outer space, are provided inside the communicating path between said thrust bearing the thrust bearing inner space.

  According to the scroll compressor of the present invention, by providing the inner communication path between the thrust bearing and the thrust bearing inner space, the lubricating oil is supplied to the thrust bearing through the inner communication path, so that the reliability is improved and the sliding is improved. Dynamic loss is reduced.

Sectional drawing of the scroll compressor in Embodiment 1 of this invention The perspective view of the scroll compressor in Embodiment 1 of this invention 1 is an exploded perspective view of a scroll compressor according to Embodiment 1 of the present invention. (A) The top view of the main bearing member of the scroll compressor in Embodiment 1 of this invention, (b) Sectional drawing of the main bearing member of the scroll compressor (A) Sectional drawing of the main bearing member of the scroll compressor in Embodiment 1 of this invention, (b) Sectional drawing of the main bearing member of the scroll compressor (A) The top view of the main bearing member of the scroll compressor in Embodiment 2 of this invention, (b) Sectional drawing of the main bearing member of the scroll compressor (A) The top view of the main bearing member of the scroll compressor in Embodiment 2 of this invention, (b) Sectional drawing of the main bearing member of the scroll compressor (A) The top view of the main bearing member of the scroll compressor in Embodiment 2 of this invention, (b) Sectional drawing of the main bearing member of the scroll compressor (A) The top view of the main bearing member of the conventional scroll compressor, (b) Sectional drawing of the main bearing member of the scroll compressor of the conventional scroll compressor

  A scroll compressor according to a first aspect of the present invention is provided with a partition plate that partitions a sealed container into a lower low pressure chamber and an upper high pressure chamber, and the motor and the compression mechanism are stored in the lower low pressure chamber partitioned by the partition plate. The compression mechanism unit is combined with the orbiting scroll in which a spiral wrap is formed upright on the end plate, a main bearing member that supports the rear surface of the end plate of the orbiting scroll, and the orbiting scroll. A fixed scroll formed upright, a drive shaft, and an eccentric shaft provided at one end of the drive shaft are integrally formed, and the eccentric shaft is supported by a cylindrical boss portion of the orbiting scroll, and the drive shaft The main shaft is a scroll compressor supported by the main bearing member, and a cylindrical boss portion of the orbiting scroll inside the thrust bearing of the main bearing member that supports the rear surface of the end plate of the orbiting scroll The pivoting space and the thrust bearing inner space, the motor upper space outside the thrust bearing and the thrust bearing outer space, is provided with a inner communicating passage between said thrust bearing thrust bearing inner space. According to this configuration, since the lubricating oil is supplied to the thrust bearing through the inner communication path, it is not necessary to provide an oil groove in the radial direction of the thrust bearing from the thrust bearing inner space, and the thrust bearing is a continuous plane. Thus, the reliability is improved and the sliding loss is reduced.

  In a second aspect of the invention, in particular, in the scroll compressor of the first aspect, the distance between the center of the drive shaft and the center of the main shaft is the turning radius of the orbiting scroll, and the radial width of the thrust bearing is turned. This is smaller than twice the radius. According to this configuration, the lubricating oil can be supplied to the entire thrust bearing by the orbiting motion of the rear surface of the orbiting scroll, which improves the reliability and reduces the sliding loss.

  According to a third aspect of the invention, in particular, in the scroll compressor of the first or second aspect of the invention, an outer communication path that connects the inner communication path and the thrust bearing outer space is provided. According to this configuration, since the lubricating oil can be discharged from the thrust bearing to the thrust bearing outer space, heat generated in the thrust bearing can be forcibly discharged to the thrust bearing outer space. Improves.

According to a fourth aspect of the invention, in particular, in the scroll compressor of the first aspect, an annular oil groove communicating with the inner communication passage is provided in the thrust bearing. According to this configuration, the lubricating oil can be supplied to the entire circumference of the thrust bearing through the annular oil groove, so that reliability is improved and sliding loss is reduced.

  The fifth aspect of the invention is particularly the scroll compressor of the fourth aspect of the invention, wherein the distance between the center of the drive shaft and the center of the main shaft is the turning radius of the orbiting scroll, and the inner thrust bearing and the outer side of the annular oil groove The radial width of the thrust bearing is smaller than twice the turning radius. According to this configuration, the lubricating oil can be supplied to the entire thrust bearing by the orbiting motion of the rear surface of the orbiting scroll, which improves the reliability and reduces the sliding loss.

  In a sixth aspect of the invention, in particular, in the scroll compressor of the fourth or fifth aspect of the invention, an outer communication passage that connects the annular oil groove and the thrust bearing outer space is provided. According to this configuration, since the lubricating oil can be discharged from the thrust bearing to the thrust bearing outer space, heat generated in the thrust bearing can be forcibly discharged to the thrust bearing outer space. Improves.

  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)
1 is a cross-sectional view of a scroll compressor according to an embodiment of the present invention, FIG. 2 is a perspective view of the scroll compressor, FIG. 3 is an exploded perspective view of the scroll compressor, and FIG. 4A is the scroll compressor. FIG. 4B is a cross-sectional view of the main bearing member of the scroll compressor.

  In FIG. 1, an end cap 14 from the upper end side and a bottom 37 from the lower end side are combined with a cylindrical body 27 whose both ends are open, and the sealed container 1 having both ends closed is formed. The inside of the hermetic container 1 is partitioned by a partition plate 16 into a high pressure chamber 10 at the top and a low pressure chamber 11 at the bottom. The low-pressure chamber 11 includes a motor 2, a compression mechanism unit 3, and a liquid storage unit 12 that stores lubricating oil 13. The motor 2 is driven by a motor drive circuit unit (not shown). The motor 2 includes a stator 4 fixed to the inner wall surface of the hermetic container 1 and a rotor 5 rotatably supported on the inner side of the stator 4. A drive shaft 6 is coupled to the rotor 5 in a penetrating state. ing. One of the drive shafts 6 is rotatably supported by a main bearing member 7 that constitutes a part of the compression mechanism section 3 and the other is supported by a sub-bearing member 33. Then, the refrigerant gas is sucked into the compression mechanism section 3 from the suction pipe 8 through the low pressure chamber 11 to compress the refrigerant gas, and the compressed refrigerant gas is discharged from the discharge pipe 9 through the high pressure chamber 10. The lubricating oil 13 lubricates each sliding part and is used as a seal for the sliding part of the compression mechanism part 3 and is compatible with the refrigerant.

  However, the present invention is not limited to these. Basically, the compression mechanism part 3 that sucks, compresses and discharges the working fluid, the motor 2 that drives the compression mechanism part 3, and the liquid that is used for lubrication of each sliding part including the compression mechanism part 3 is stored. The liquid storage unit 12 is not limited to the following description as long as it is a scroll compressor in which the low-pressure chamber 11 of the sealed container 1 is built and the motor 2 is driven by the motor drive circuit unit.

2 and 3, the mounting bracket 15 is attached to the end cap 14, and the mounting leg 36 is attached to the bottom 37. The sealing material 17 seals between the partition plate 16 and the fixed scroll 20. The float valve 19 is fixed to the discharge port of the fixed scroll 20 to constitute a float valve mechanism. A guide 18 is attached to the float valve mechanism, and a key 21 is integrally attached to the fixed scroll 20. A tip seal 22 is attached to the tip of the wrap of the fixed scroll 20, and a tip seal 24 is attached to the tip of the wrap of the orbiting scroll 23, as with the fixed scroll 20. Between the main bearing member 7 and the orbiting scroll 23, an Oldham ring 25 that restricts the rotation of the orbiting scroll 23 is provided. An oil cover 26 is attached to the lower side of the main bearing member 7.

  A terminal 28 is provided on the side surface of the body 27, and is connected to the lead wire of the stator 4 that is shrink-fitted or press-fitted into the body 27. The terminal 28 is covered with a terminal cover 29. The eccentric shaft 6 a is supported by the cylindrical boss portion 23 a of the orbiting scroll 23 and the main shaft 6 b is supported by the main bearing member 7. An oil pickup 30 is attached to the end of the drive shaft 6 to pick up the lubricating oil 13. Balancers (end surface members that also serve as balance weights) 31 and 32 are attached to the top and bottom of the rotor 5 and are extrapolated to the drive shaft 6. The auxiliary bearing member 33 supports the auxiliary shaft 6 c of the drive shaft 6, and a thrust bearing is provided at a lower portion thereof by attaching a thrust 34 with a cover 35.

  In FIG. 1, the lubricating oil 13 is guided from the oil supply hole 30 a of the oil pickup 30 to the oil supply hole 6 d of the drive shaft 6. Return to 12. Most of the lubricating oil 13 lubricates the main shaft 6 b and the eccentric shaft 6 a and is guided to the thrust bearing inner space 7 b of the main bearing member 7. An inner communication path 7c is provided between the thrust bearing 7a and the thrust bearing inner space 7b. According to this configuration, since the lubricating oil 13 is supplied to the thrust bearing 7a through the inner communication path 7c, it is not necessary to provide an oil groove in the radial direction of the thrust bearing 7a from the thrust bearing inner space 7b, and the thrust bearing 7a It can be constituted by a continuous annular plane without any separation in the radial direction, smooth sliding, improving reliability, and reducing sliding loss.

  Further, as shown in FIGS. 4A and 4B, it is preferable to provide a plurality of inner communication paths 7c. The lubricity of the thrust bearing 7a is further improved, the reliability is improved, and the sliding loss is reduced. Moreover, the lubricity of the thrust bearing 7a is further stabilized by arranging the plurality of inner communication paths 7c at equal intervals.

  In addition, it is preferable that the radial width Wa of the thrust bearing 7a of the present embodiment is smaller than twice the turning radius. The revolving motion of the orbiting scroll 23 on the back of the end plate allows the lubricant 13 to be supplied evenly from the inside to the outside of the thrust bearing 7a, improving the lubrication performance, improving the reliability, and reducing the sliding loss. To do.

  Further, the larger the width of the thrust bearing 7a, the larger the bearing area, and the reduction in surface pressure improves performance and reliability. For example, the same effect can be obtained by removing the inner side and the outer side of the thrust bearing 7a gently by buffing or the like so that the width of the flat portion remaining without being removed is smaller than twice the turning radius.

  For example, it is preferable to provide a recess (not shown) on the rear surface of the end plate of the orbiting scroll 23. The recess moves back and forth through the thrust bearing 7a by the turning motion. By disposing the recesses at the positions where the inner side and the outer side of the thrust bearing 7a communicate with each other, the lubricating oil 13 can be quantitatively guided to the compression mechanism unit 3, and the sealing performance in the compression stroke is improved and the compression efficiency is improved. improves.

As shown in FIG. 5A, an outer communication path 7e that connects the inner communication path 7c and the thrust bearing outer space 7d of the present embodiment may be provided. The lubricating oil 13 lubricates the thrust bearing 7 a, and then is guided from the thrust bearing outer space 7 d to the outer peripheral notch 4 a of the stator 4 through the outer communication path 7 e and returns to the liquid storage section 12. According to this configuration, the heat generated in the thrust bearing 7a can be transferred to the lubricating oil 13 and forcibly discharged to the thrust bearing outer space 7d through the outer communication path 7e. improves. Further, by providing a plurality of outer communication passages 7e, the discharge amount of the lubricating oil 13 is stabilized and the heat dissipation is improved.

  Further, as shown in FIG. 5B, the inner communication path 7c and the outer communication path 7e of the present embodiment may be communicated with each other by a thrust bearing 7a. According to this configuration, all of the lubricating oil 13 guided to the thrust bearing inner space 7b passes through the thrust bearing 7a and then is forcibly discharged to the thrust bearing outer space 7d through the outer communication path 7e. The amount of heat generated in 7a is increased, and the reliability is further improved. Further, by providing a plurality of outer communication passages 7e, the discharge amount of the lubricating oil 13 is stabilized and the heat dissipation is improved.

(Embodiment 2)
FIG. 6A is a plan view of the main bearing member 7, and FIG. 6B is a cross-sectional view of the main bearing member 7. In the present embodiment, an annular oil groove 7f communicating with the inner communication path 7c is provided in the thrust bearing 7a. According to this configuration, the lubricating oil 13 can be distributed over the entire circumference of the thrust bearing 7a through the annular oil groove 7f, so that the lubricating oil 13 can be evenly supplied to the entire area of the thrust bearing 7a, improving reliability and sliding loss. Is reduced.

  It is preferable to provide a plurality of inner communication paths 7c. Thereby, the quantity of the lubricating oil 13 supplied to the annular oil groove 7f is stabilized. Moreover, it is preferable to make the diameter of the inner side communication path 7c below the groove width of the annular oil groove 7f. There is no corner in the thrust bearing 7a, improving the reliability and reducing the sliding loss.

  Further, the radial width Wg of the inner thrust bearing 7g and the radial width Wh of the outer thrust bearing 7h of the annular oil groove 7f of the present embodiment are smaller than twice the turning radius, respectively. Due to the swivel motion of the back of the end plate, the lubricating oil 13 can be supplied evenly from the inside to the outside of each of the inner thrust bearing 7g and the outer thrust bearing 7h, improving the lubricating performance, improving the reliability, Dynamic loss is reduced.

  Further, the larger the width of the inner thrust bearing 7g and the outer thrust bearing 7h, the larger the bearing area, and the reduction in surface pressure improves performance and reliability. For example, the inner side and the outer side of the inner thrust bearing 7g and the outer thrust bearing 7h are gently removed by buffing or the like, so that the width of the flat portion remaining without being removed is smaller than twice the turning radius. The effect is obtained.

  Further, for example, by providing a recess (not shown) on the back of the end plate of the orbiting scroll 23, the recess moves back and forth through the outer thrust bearing 7h by the orbiting motion. By disposing the recesses at the positions where the inner side and the outer side of the outer thrust bearing 7 h communicate with each other, the lubricating oil 13 can be quantitatively guided to the compression mechanism unit 3, the sealing performance in the compression stroke is improved, and the compression efficiency Will improve.

  Further, as shown in FIGS. 7A and 7B, an outer communication path 7e that connects the annular oil groove 7f and the thrust bearing outer space 7d of the present embodiment is provided. According to this configuration, heat generated in the inner thrust bearing 7g and the outer thrust bearing 7h can be transferred to the lubricating oil 13 and forcibly discharged to the thrust bearing outer space 7d through the outer communication path 7e. To improve reliability. Further, by providing a plurality of outer communication passages 7e, the discharge amount of the lubricating oil 13 is stabilized and the heat dissipation is improved.

Further, as shown in FIGS. 8A and 8B, the inner communication path 7c and the outer communication path 7e of the present embodiment are arranged at positions where they do not overlap each other. According to this configuration, the inner communication path 7
Since all of the lubricating oil 13 guided to c passes through the annular oil groove 7f and is forcibly discharged to the thrust bearing outer space 7d through the outer communication passage 7e, it is generated in the inner thrust bearing 7g and the outer thrust bearing 7h. This increases the amount of heat discharged and further improves the reliability. Further, by providing a plurality of outer communication passages 7e, the discharge amount of the lubricating oil 13 is stabilized and the heat dissipation is improved.

  As described above, in the scroll compressor according to the present invention, the lubricating oil is supplied to the thrust bearing through the inner communication path by providing the inner communication path between the thrust bearing and the thrust bearing inner space. Therefore, it is not necessary to provide an oil groove in the radial direction of the thrust bearing from the inner space of the thrust bearing, and the thrust bearing can be constituted by a continuous annular plane, improving reliability and reducing sliding loss. The working fluid is not limited to a refrigerant, and can be applied to applications of scroll fluid machines such as an air scroll compressor, a vacuum pump, and a scroll type expander.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Motor 3 Compression mechanism part 4 Stator 4a Notch 5 Rotor 6 Drive shaft 6a Eccentric shaft 6b Main shaft 6c Sub shaft 6d Oil supply hole 7 Main bearing member 7a Thrust bearing 7b Thrust bearing inner space 7c Inner communication path 7d Thrust bearing outer Space 7e Outer communication path 7f Annular oil groove 7g Inner thrust bearing 7h Outer thrust bearing 8 Suction pipe 9 Discharge pipe 10 High pressure chamber 11 Low pressure chamber 12 Liquid storage section 13 Lubricating oil 14 End cap 15 Mounting bracket 16 Partition plate 17 Sealing material 18 Guide DESCRIPTION OF SYMBOLS 19 Float valve 20 Fixed scroll 21 Key 22 Tip seal 23 Orbiting scroll 23a Cylindrical boss part 24 Tip seal 25 Oldham ring 26 Oil cover 27 Body 28 Terminal 29 Terminal cover 30 Oil pickup 30a Oil supply hole 31 Balun Support 32 Balancer 33 Sub-bearing member 34 Thrust 35 Cover 36 Mounting leg 37 Bottom

Claims (6)

A partition plate for partitioning the inside of the sealed container into a lower low pressure chamber and an upper high pressure chamber is provided, and the motor and the compression mechanism are stored in the lower low pressure chamber,
The compression mechanism unit is an orbiting scroll formed by standing up a spiral wrap on the end plate, a main bearing member that supports the back of the end plate of the orbiting scroll, and the orbiting scroll combined with the orbiting scroll to erect the spiral wrap on the end plate. A fixed scroll, a drive shaft, and an eccentric shaft provided at one end of the drive shaft are integrally formed;
The eccentric shaft is supported by a cylindrical boss portion of the orbiting scroll, and the main shaft of the drive shaft is a scroll compressor supported by the main bearing member,
Inside the thrust bearing in the main bearing member, the space in which the cylindrical boss portion of the orbiting scroll revolves is the thrust bearing inner space,
The space above the motor outside the thrust bearing is the thrust bearing outer space,
A scroll compressor, wherein an inner communication path is provided between the thrust bearing and the thrust bearing inner space. The distance between the center of the drive shaft and the center of the main shaft is the turning radius of the orbiting scroll,
The scroll compressor according to claim 1, wherein a radial width of the thrust bearing is smaller than twice the turning radius. The scroll compressor according to claim 1 or 2, further comprising an outer communication path that connects the inner communication path and the thrust bearing outer space. The scroll compressor according to claim 1, wherein an annular oil groove communicating with the inner communication path is provided in the thrust bearing. The distance between the center of the drive shaft and the center of the main shaft is the turning radius of the orbiting scroll,
The scroll compressor according to claim 4, wherein the radial width of the inner thrust bearing and the outer thrust bearing of the annular oil groove is smaller than twice the turning radius. The scroll compressor according to claim 4 or 5, wherein an outer communication path that connects the annular oil groove and the thrust bearing outer space is provided.

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