JP2014141887A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a lubrication oil 13 guided from a liquid storage part 12 by a centrifugal force involved with rotations of a drive shaft 6 are not sufficiently supplied to a slide part of a compression mechanism part 3 because the compression mechanism part 3 is disposed at an upper part of a motor 2.SOLUTION: A shape of an inner diameter part 7b of an oil sump space 7a, in which a cylindrical boss part 23a of a revolving scroll 23 of a main bearing member 7 revolves, is formed into a taper shape which extends to the upper opening side. In the structure, a centrifugal force is generated in the lubrication oil 13 of the oil sump space 7a in which the cylindrical boss part 23a of the revolving scroll 23 revolves and thus the lubrication oil 13 is actively supplied to a slide part of a compression mechanism part 3 to shorten the supply time. Therefore, the reliability is improved and slide loss is reduced.

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 type hot water supply device.

  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).

JP-A-11-182433

  However, in the conventional configuration, since the compression mechanism portion is disposed on the upper portion of the motor, the lubricating oil guided from the liquid storage portion by the centrifugal force of the drive shaft rotation cannot be sufficiently supplied to the sliding portion of the compression mechanism portion. Had.

  The present invention solves the conventional problems, and the orbiting scroll is formed by changing the shape of the inner diameter portion of the oil sump space in which the cylindrical boss portion of the orbiting scroll of the main bearing member revolves to the upper opening side. Centrifugal force is generated in the lubricating oil in the oil sump space where the cylindrical boss turns, and the lubricating oil can be supplied to the sliding part of the compression mechanism part actively and in a short time, improving reliability and sliding loss. The purpose is to reduce this.

  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 a motor and a compression mechanism section are provided in the lower low pressure chamber partitioned by the partition plate. Storing, the orbiting scroll formed by standing up the spiral wrap on the end plate, the fixed scroll formed by standing up the spiral wrap on the end plate combined with the orbiting scroll, the drive shaft, An eccentric shaft provided at one end of the drive shaft is integrally formed, the eccentric shaft is supported by a cylindrical boss portion of the orbiting scroll, and the main shaft on the eccentric shaft side of the drive shaft is supported by a main bearing member. The counter shaft on the opposite side is supported by the sub bearing member, and an oil pickup is attached to the lower end of the sub shaft, and the refrigerant compressed by the compression mechanism is partitioned by the partition plate via the discharge port of the fixed scroll. Is A scroll compressor having a structure for discharging to an upper high pressure chamber, wherein the shape of the inner diameter portion of the oil sump space in which the cylindrical boss portion of the orbiting scroll of the main bearing member revolves is expanded to the upper opening side. It is characterized by its shape.

  According to a second aspect of the present invention, in the scroll compressor according to the first aspect, the angle formed by the inner diameter portion of the main bearing member with the center line of the drive shaft is determined from the inner diameter of the oil supply hole of the oil pickup. A straight line connecting a point farthest from the center line of the drive shaft at the opening end on the eccentric shaft side of the hole is made larger than an angle formed with the center line of the drive shaft.

  According to a third invention, in the scroll compressor according to the first or second invention, a spiral groove is provided in an inner diameter portion of the main bearing member.

  According to a fourth aspect of the present invention, in the scroll compressor according to any one of the first to third aspects of the invention, the outer diameter portion of the cylindrical boss portion of the orbiting scroll has a tapered shape that increases in diameter upward. It is characterized by.

  According to a fifth invention, in the scroll compressor according to any one of the first to fourth inventions, a spiral groove is provided in an outer diameter portion of the cylindrical boss portion of the orbiting scroll.

  The scroll compressor according to the present invention has a cylindrical boss of the orbiting scroll by making the shape of the inner diameter portion of the oil sump space in which the cylindrical boss portion of the orbiting scroll of the main bearing member revolves into a taper shape extending to the upper opening side. Centrifugal force is generated in the lubricating oil in the oil sump space where the part turns, and the force acts in the direction of running up the slope along the taper shape, so the lubricating oil is actively applied to the sliding part of the compression mechanism and the time is shortened. Therefore, reliability is improved and sliding loss is reduced.

First sectional view of a scroll compressor according to an embodiment of the present invention Perspective view of the scroll compressor Exploded perspective view of the scroll compressor Cross section of main bearing member of the scroll compressor Second sectional view of the 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 a motor and a compression mechanism section are provided in the lower low pressure chamber partitioned by the partition plate. Storing, the orbiting scroll formed by standing up the spiral wrap on the end plate, the fixed scroll formed by standing up the spiral wrap on the end plate combined with the orbiting scroll, the drive shaft, An eccentric shaft provided at one end of the drive shaft is integrally formed, the eccentric shaft is supported by a cylindrical boss portion of the orbiting scroll, and the main shaft on the eccentric shaft side of the drive shaft is supported by a main bearing member. The counter shaft on the opposite side is supported by the sub bearing member, and an oil pickup is attached to the lower end of the sub shaft, and the refrigerant compressed by the compression mechanism is partitioned by the partition plate via the discharge port of the fixed scroll. Is A scroll compressor having a structure for discharging to an upper high pressure chamber, wherein the shape of the inner diameter portion of the oil sump space in which the cylindrical boss portion of the orbiting scroll of the main bearing member revolves is expanded to the upper opening side. By adopting the shape, centrifugal force is generated in the lubricating oil in the oil sump space where the cylindrical boss part of the orbiting scroll revolves, and the force acts in the direction of running up the slope along the taper shape. Lubricating oil can be supplied to the moving part actively and in a shorter time, improving reliability and reducing sliding loss.

  In particular, in the scroll compressor according to the first aspect of the invention, the angle formed by the inner diameter portion of the main bearing member and the center line of the drive shaft is changed from the inner diameter of the oil pickup oil hole to the oil supply hole of the drive shaft. Lubricating the oil sump space where the cylindrical boss part of the orbiting scroll turns by making the straight line connecting the point farthest from the center line of the drive shaft at the eccentric shaft side open end larger than the angle formed with the center line of the drive shaft The ascending force component generated in the oil is larger than the ascending force component generated by the rotation of the drive shaft, and can be supplied to the sliding part of the compression mechanism part more actively and with reduced time, improving reliability and reducing sliding loss. To reduce.

  According to a third aspect of the invention, in the scroll compressor of the first or second aspect of the invention, the oil reservoir space in which the cylindrical boss portion of the orbiting scroll revolves by providing a spiral groove in the inner diameter portion of the main bearing member. Since the lubricating oil is guided to the sliding portion along the spiral groove, the lubricating oil can be stably supplied to the sliding portion of the compression mechanism portion, and the reliability is improved and the sliding loss is reduced.

  According to a fourth aspect of the invention, in particular, in the scroll compressor according to any one of the first to third aspects of the present invention, the shape of the outer diameter portion of the cylindrical boss portion of the orbiting scroll is a taper shape that increases the diameter upward. As a result, the volume of the space between the outer diameter portion of the cylindrical boss portion and the inner diameter portion which is the tapered shape of the main bearing member is reduced, and the lubricating oil is likely to run up by centrifugal force. Lubricating oil can be supplied to the sliding portion actively and with reduced time, improving reliability and reducing sliding loss.

  According to a fifth aspect of the present invention, in the scroll compressor according to any one of the first to fourth aspects of the present invention, a spiral groove is provided in the outer diameter portion of the cylindrical boss portion of the orbiting scroll. Since the lubricating oil in the oil sump space where the cylindrical boss part turns is guided to the sliding part along the spiral groove, the lubricating oil can be stably supplied to the sliding part of the compression mechanism part, and the reliability is improved. At the same time, sliding loss is reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment)
1 and 5 are sectional views 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. 4 is the scroll compressor. It is sectional drawing of the main bearing member.

  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.

  FIG. 4A shows a cross-sectional view of the main bearing member 7, which has a tapered shape in which the inner diameter portion 7 b of the oil reservoir space 7 a in which the cylindrical boss portion 23 a of the orbiting scroll 23 revolves spreads upward. The thrust bearing portion 7c is provided with an oil groove 7d, communicates with the oil hole 7e, and opens to the back surface portion 7f.

  FIG. 4B also shows a cross-sectional view of the main bearing member 7 as in FIG. 4A, and a spiral groove 7g is provided in the inner diameter portion 7b which is a tapered shape of the main bearing member 7 of the present embodiment. Thus, the lubricating oil 13 is stably guided to the thrust bearing portion 7c along the spiral groove 7g. For example, by providing the spiral groove 7g according to the turning direction of the cylindrical boss 23a of the orbiting scroll 23, further stable oil supply becomes possible, reliability is improved, and sliding loss is reduced.

  Further, although not shown, the outer diameter of the cylindrical boss 23a of the orbiting scroll 23 is tapered so that the outer diameter of the cylindrical boss 23a is increased upward. The volume of the space between the inner diameter portion 7b and the tapered shape is reduced, and the lubricating oil 13 is likely to run up by centrifugal force. Further, by providing a spiral groove on the outer diameter surface of the cylindrical boss portion 23a of the orbiting scroll 23, further stable oil supply becomes possible, reliability is improved, and sliding loss is reduced.

  FIG. 5 shows an oil supply path from the liquid storage part 12 of the lubricating oil 13 to the sliding part of the compression mechanism part 3. 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, and a part of the lubricating oil 13 lubricates the auxiliary shaft 6 c and returns to the liquid storage unit 12 through the gap. Most of the lubricating oil 13 lubricates the main shaft 6b and the eccentric shaft 6a, is guided to the tapered inner diameter portion 7b of the main bearing member 7, and further lubricates the thrust bearing portion 7c. Then, it is guided from the back surface portion 7f to the outer peripheral portion notch 4a of the stator 4 and returns to the liquid storage portion 12.

  According to this configuration, the lubricating oil 13 is guided to the oil reservoir space 7a of the main bearing member 7 by the centrifugal force accompanying the rotation of the drive shaft 6, and before the lubricating oil 13 fills the oil reservoir space 7a, the turning scroll 23 Since the lubricating oil 13 acts in the direction of running up the slope along the tapered shape of the inner diameter portion 7b due to the centrifugal force accompanying the turning of the cylindrical boss portion 23a, the thrust bearing portion 7c is actively and shortened in time. This improves reliability and reduces sliding loss.

  Further, the angle α between the inner diameter portion 7b of the main bearing member 7 of the present embodiment and the center line 6e of the drive shaft 6 is set to the eccentric shaft of the oil supply hole 6d of the drive shaft 6 from the inner diameter of the oil supply hole 30a of the oil pickup 30. Since the straight line connecting the point 6f farthest from the center line 6e of the drive shaft 6 at the opening end on the 6a side is larger than the angle β formed with the center line 6e of the drive shaft 6, the lubricating oil 13 becomes the inner diameter of the main bearing member 7. Since the force component rising along the taper shape of the portion 7b is larger than the force component rising along the oil supply hole 6d of the drive shaft 6, the force component is supplied to the thrust bearing portion 7c more positively and with reduced time. Reliability is improved and sliding loss is reduced.

As described above, the scroll compressor according to the present invention has a tapered shape in which the inner diameter shape of the oil sump space in which the cylindrical boss portion of the orbiting scroll of the main bearing member revolves is expanded to the upper opening side. Centrifugal force is generated in the lubricating oil in the oil sump space where the cylindrical boss turns, and the lubricating oil can be supplied to the sliding part of the compression mechanism part actively and with reduced time, improving reliability and sliding. Since the loss is reduced, the working fluid is not limited to the 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 6e Center line 6f Point farthest from center line 7 Main bearing member 7a Oil sump space 7b Inner diameter portion 7c Thrust bearing portion 7d Oil groove 7e Oil hole 7f Back surface portion 7g Spiral groove 8 Suction tube 9 Discharge tube 10 High pressure chamber 11 Low pressure chamber 12 Liquid storage portion 13 Lubricating oil 14 End cap 15 Mounting bracket 16 Partition plate 17 Sealing material 18 Guide 19 Float valve 20 Fixed scroll 21 Key 22 Tip seal 23 Orbiting scroll 23a Cylindrical boss portion 24 Tip seal 25 Oldham ring 26 Oil cover 27 Body 28 Terminal 29 Terminal cover 30 Oil pickup 30a Oil supply hole 31 Balancer 32 Balancer 33 Sub bearing Member 34 Thrust 35 Cover 36 Mounting leg 37 Bottom

Claims (5)

A partition plate for partitioning the inside of the hermetic container into a lower low pressure chamber and an upper high pressure chamber is provided, and a motor and a compression mechanism unit are housed in a lower low pressure chamber partitioned by the partition plate. An orbiting scroll formed upright with a spiral wrap, a fixed scroll combined with the orbiting scroll and formed with an upright spiral wrap on an end plate, a drive shaft, and an eccentricity provided at one end of the drive shaft The shaft is integrally formed, the eccentric shaft is supported by the cylindrical boss portion of the orbiting scroll, the main shaft on the eccentric shaft side of the drive shaft is supported by the main bearing member, and the counter shaft on the opposite side is the sub bearing member And an oil pickup is attached to the lower end of the auxiliary shaft, and the refrigerant compressed by the compression mechanism is discharged into the upper high-pressure chamber partitioned by the partition plate through the discharge port of the fixed scroll. With A scroll compressor characterized in that the shape of the inner diameter portion of the oil sump space in which the cylindrical boss portion of the orbiting scroll of the main bearing member revolves is a tapered shape that expands toward the upper opening side. . The angle formed by the inner diameter portion of the main bearing member and the center line of the drive shaft is from the inner diameter of the oil supply hole of the oil pickup, and from the center line of the drive shaft at the eccentric shaft side opening end of the oil supply hole of the drive shaft. The scroll compressor according to claim 1, wherein a straight line connecting the farthest points is larger than an angle formed with a center line of the drive shaft. The scroll compressor according to claim 1 or 2, wherein a spiral groove is provided in an inner diameter portion of an oil reservoir space of the main bearing member. The scroll compressor in any one of Claim 1 to 3 which made the shape of the outer-diameter part of the cylindrical boss | hub part of the said orbiting scroll into the taper shape which becomes upward diameter expansion. The scroll compressor according to any one of claims 1 to 4, wherein a spiral groove is provided in an outer diameter portion of the cylindrical boss portion of the orbiting scroll.