JP2011094546A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vertical scroll compressor having improved rotational performance. <P>SOLUTION: In this vertical scroll compressor 10, a lower bearing member 30, an electric motor 35, a compression mechanism 40 and a drive shaft 20 are provided inside a casing 11. The drive shaft 20 is supported by a plurality of ball bearings 31, 47. The ball bearings 31, 47 are composed of outer rings 1, inner rings 2, a plurality of balls 3, and retainers 4 having pocket surfaces 5 for retaining the balls at regular intervals. The pocket surfaces 5 of the retainers 4 are formed with recessed portions 6 for keeping lubricating oil therein. The bearings 31, 47 are so incorporated that the recessed portions 6 are arranged just under the balls 3. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a measure for improving the rotational performance of a scroll compressor.

  As a conventional scroll compressor, Patent Document 1 discloses a scroll compressor 10 configured as a so-called hermetic seal as shown in FIG. The scroll compressor 10 includes a casing 11 formed in a vertically long and cylindrical sealed container shape. Inside the casing 11, a lower bearing member 30, an electric motor 35, and a compression mechanism 40 are arranged in order from the bottom to the top. A drive shaft 20 that extends vertically is provided inside the casing 11.

  A suction pipe 14 is attached to the body of the casing 11. The suction pipe 14 opens into the second chamber 13 in the casing 11. On the other hand, a discharge pipe 15 is attached to the upper end portion of the casing 11. The discharge pipe 15 is open to the first chamber 12 in the casing 11.

  The drive shaft 20 includes a main shaft portion 21, a flange portion 22, and an eccentric portion 23. The flange portion 22 is formed at the upper end of the main shaft portion 21 and has a disk shape having a larger diameter than the main shaft portion 21. On the other hand, the eccentric part 23 projects from the upper surface of the flange part 22. The eccentric portion 23 has a columnar shape with a smaller diameter than the main shaft portion 21, and the shaft center is eccentric with respect to the axis of the main shaft portion 21. The main shaft portion 21 of the drive shaft 20 passes through the housing 41 of the compression mechanism 40. The main shaft portion 21 is supported by the housing 41 via a roller bearing 42.

  A slide bush 25 is attached to the drive shaft 20. The slide bush 25 includes a cylindrical portion 26 and a balance weight portion 27 and is placed on the flange portion 22. An eccentric portion 23 of the drive shaft 20 is rotatably inserted into the cylindrical portion 26 of the slide bush 25.

  The lower bearing member 30 is fixed to the housing 41 by bolts 32. The lower bearing member 30 supports the main shaft portion 21 of the drive shaft 20 via a ball bearing 31.

  The electric motor 35 includes a stator 36 and a rotor 37. The stator 36 is fixed to the housing 41 by bolts 32 together with the lower bearing member 30. On the other hand, the rotor 37 is fixed to the main shaft portion 21 of the drive shaft 20.

    The compression mechanism 40 includes a movable scroll 50, an Oldham ring 43, and a thrust ring 46 in addition to the fixed scroll 55 and the housing 41. In the compression mechanism 40, the compression chamber 45 is formed by meshing the fixed side wrap 58 of the fixed scroll 55 and the movable side wrap 52 of the movable scroll 50. The fixed scroll 55 includes a fixed side flat plate portion 56 and an edge portion 57 in addition to the fixed side wrap 58.

  The fixed scroll 55 is fixed to the housing 41 by bolts 44. When the edge 57 of the fixed scroll 55 is in close contact with the casing 11, the inside of the casing 11 is partitioned into the first chamber 12 and the second chamber 13.

  The fixed side wrap 58 is erected on the lower surface side of the fixed side flat plate portion 56 and is formed integrally with the fixed side flat plate portion 56. The fixed side wrap 58 is formed in a spiral wall shape having a constant height. The side surface of the fixed side wrap 58 is an envelope surface of the movable side wrap 52 described later.

    The movable scroll 50 includes a movable side flat plate portion 51, a movable side wrap 52, and a protruding portion 53.

  The movable side flat plate portion 51 is formed in a slightly thick disk shape. The protruding portion 53 is formed in a cylindrical shape, and protrudes from the lower surface of the movable side flat plate portion 51 substantially at the center. The cylindrical portion 26 of the slide bush 25 is inserted into the protruding portion 53. That is, the movable scroll 50 is engaged with the eccentric portion 23 of the drive shaft 20 via the slide bush 25.

  The movable side wrap 52 is erected on the upper surface side of the movable side flat plate portion 51 and is formed integrally with the movable side flat plate portion 51. As shown in FIG. 5, the movable wrap 52 is formed in a spiral wall shape having a constant height. The movable wrap 52 has a spiral shape whose shape seen from the tip side draws an involute curve.

  The movable scroll 50 is placed on the housing 41 via the Oldham ring 43 and the thrust ring 46.

    The Oldham ring 43 is formed with two pairs of keys. In this Oldham ring 43, a pair of keys engage with the movable side flat plate portion 51 of the movable scroll 50 and the remaining pair of keys engage with the housing 41, respectively, to restrict the rotation of the movable scroll 50.

JP 2005-201140 A

  However, since the conventional scroll compressor has a structure in which the lubricating oil is supplied only to the bearings that support the drive shaft during operation, the lubricating oil is supplied to the bearings when the operation is stopped. There is no. Further, during operation stop, the lubricating oil remaining inside the bearing also flows out of the bearing due to gravity. Therefore, at the initial stage of rotation when the operation is resumed, there is a problem that the amount of lubricating oil in each bearing becomes insufficient, and wear on the raceway surface is likely to occur.

  Furthermore, in the conventional scroll compressor, a cylindrical roller bearing is used as the upper bearing that supports the drive shaft, but there is a problem that the rotational torque becomes larger than that of the ball bearing.

  Therefore, the present invention provides a vertical scroll compressor that improves the disadvantages of the conventional example described above, prevents damage to the bearing that supports the drive shaft at the initial stage of rotation, and further improves the rotational performance. It is an issue.

  In order to solve the above problems, the present invention provides a vertical scroll compressor in which a bearing member, an electric motor, a compression mechanism, and a drive shaft are provided inside a casing, and the drive shaft is supported by a plurality of ball bearings. The ball bearing is composed of an outer ring, an inner ring, a plurality of balls, and a cage having a pocket surface for holding the balls at equal intervals, and a pocket for holding lubricating oil is provided on the pocket surface of the cage. And the bearing is incorporated so that the concave portion is arranged directly under each ball.

  The present invention has the above-described configuration, and since all the bearings that support the drive shaft are configured by ball bearings, a reduction in torque can be realized. In addition, since the pocket surface immediately below the ball has a recess, the oil does not flow down from the cage even during a long-term stop, and the lubricating oil can be reliably held. Therefore, the lubricating oil can be supplied to the raceway surface via the balls even when the lubricating oil at the initial stage of rotation is not sufficiently supplied, and there is an effect that wear and seizure at the initial stage of the rotation can be prevented.

It is a figure which shows the axial direction cross section of the scroll compressor of Embodiment 1. FIG. It is an enlarged view which shows the axial cross section of the ball bearing of FIG. It is an enlarged view which shows the perspective view of the holder | retainer of FIG. It is an enlarged view which shows the axial direction cross section of the ball bearing of the scroll compressor of Embodiment 2. It is a figure which shows the axial direction cross section of the conventional scroll compressor.

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

Example 1
1 is an axial sectional view of a scroll compressor showing an embodiment according to the present invention, FIG. 2 is an enlarged view showing a ball bearing of FIG. 1, and FIG. 3 is an enlarged view showing a cage of FIG.

  A configuration of a scroll compressor 10 according to the present invention is shown in FIG. In the figure, the bearings that support the drive shaft 20 are all composed of ball bearings 31 and 47. Thereby, it is possible to realize a reduction in torque.

  Further, as shown in FIGS. 2 and 3, the bearing is incorporated in the drive shaft 20 so that the recess 6 provided in the pocket surface 5 of the cage 4 is disposed immediately below the ball 3. With the above configuration, the lubricating oil can be reliably held in the recess 6 even when the operation is stopped. Therefore, even when the lubricating oil is not sufficiently supplied as in the initial stage of rotation, the lubricating oil can be supplied to the raceway surfaces 7 and 8 through the balls 3, and initial wear and seizure can be prevented. Become.

  FIG. 3 shows an example of the shape of a cage to be incorporated, which is a cage generally called a crown shape.

  FIG. 4 shows an embodiment of another shape of the cage 4 '. This is a shape generally called a press holder. Also in this embodiment, since the concave portion 6 ′ is provided in the pocket surface directly below the ball 3 ′, the same effect as in the first embodiment is exhibited. In the case of the present embodiment, initial wear can be suppressed regardless of the direction in which the cage 4 ′ is assembled (even if the upper and lower sides are reversed in the drawing).

  The scroll compressor of the present invention can be suitably used as a compressor for compressing refrigerants of various refrigerators.

1,1 'outer ring
2,2 'inner ring
3,3 'ball
4,4 'cage
5 Pocket surface
6,6 'recess
7,7 'raceway surface (outer ring)
8,8 'raceway surface (inner ring)
10 Scroll compressor
11 Casing
12 Room 1
13 Room 2
14 Suction pipe
15 Discharge pipe
20 Drive shaft
21 Main shaft
22 Buttocks
23 Eccentric part
25 Slide bush
26 Cylindrical part
30 Lower bearing member
31 Ball bearing
32 volts
35 Electric motor
36 Stator
37 Rotor
40 Compression mechanism
41 housing
42 Roller bearings
43 Oldham Ring
44 volts
45 Compression chamber
46 Thrust Ring
47,47 'ball bearing
50 working scroll
51 Movable plate
52 Movable wrap
53 Protrusion
55 Fixed scroll
56 Fixed plate
57 Edge
58 Fixed wrap

Claims (1)

  In a vertical scroll compressor in which a bearing member, an electric motor, a compression mechanism, and a drive shaft are provided inside the casing, the drive shaft is supported by a plurality of ball bearings, and the ball bearing includes an outer ring, an inner ring, a plurality of balls, And a retainer having a pocket surface for holding the balls at equal intervals, the pocket surface of the retainer is provided with a recess for retaining lubricating oil, and the recess is disposed immediately below each ball. The vertical scroll compressor is characterized in that the bearing is incorporated as described above.

Images