JPH01170774A - Bearing device for compressor - Google Patents

Abstract

PURPOSE:To facilitate fitting work by providing a flange portion of a specified structure below a bearing on a frame to which an outer ring is fitted in a roller bearing for rotatably supporting a rotary shaft of a scroll compressor. CONSTITUTION:A scroll compressor comprises an electric motor portion 2 and a scroll compressor portion 4 which are accommodated in a closed receptacle 1, wherein 8 frame 8 fixed to the scroll compressor portion 4 is placed on the upper end surface of a cylindrical case 3 of the closed receptacle 1 and a roller bearing portion 10 supporting a rotary shaft 9 is provided in the center of the frame 8. The bearing portion 10 comprises an inner ring 11 fitted to the rotary shaft 9, an outer ring 12 fitted to the frame 8 and a rolling element 13. The frame 8 has a flange portion 38 positioned below the bearing portion 10. In this case, the flange portion 38 is extended inside the outer periphery of the inner ring 11, and the flange portion is formed in such a manner as to set a gap 40 between the flange portion and the lower end surface of the inner ring 11.

Description

[Detailed description of the invention] B) Industrial application fields This invention relates to improvements in bearing devices for compressors.

(B) Prior Art A conventional compressor is constructed as shown in, for example, Japanese Patent Application Laid-Open No. 61-4801. Here, a conventional example will be explained with reference to this publication. In Figures 4 and 5,
The scroll compressor has a scroll compressor section 53 consisting of a fixed scroll 51 and an orbiting scroll 52 supported by a frame 54 inside the closed container 50 in the upper part thereof.

An electric motor section 55 is installed in the lower part of the airtight container 50, and an eccentric section 58 of a rotating shaft 57 connected to a rotor 56 of the electric motor section is connected to a boss hole 59 formed on the back side of the orbiting scroll 52. .

The frame 54 is assembled inside the closed container 50, and
A fixed scroll 51 is attached to the top of this frame with bolts 60.
At the same time, the lower part of this frame is integrally provided with a leg part 61 extending in the vertical direction, and the electric motor part 5 is attached to this leg part.
The stator 62 of No. 5 is fixed with a port 63, and first and second rolling bearings 64.6 are installed at two locations above and below the frame 54.
5, and a rotary shaft 57 is rotatably supported by each bearing.

A rotation prevention mechanism 66 is provided on the back side of the orbiting scroll 52 to prevent rotation of the orbiting scroll, and when the fluid sucked between the orbiting scroll 52 and the fixed scroll 51 is compressed by each of these scrolls ( are doing.

The rotating shaft 57 is provided with oil supply means 67 for lubricating the connecting portion between the eccentric portion 58 of the rotating shaft and the boss hole 59 of the orbiting scroll 52, and the rolling bearings 64 and 65 of the rotating shaft 57 relative to the frame 54, respectively. It is provided.

The oil supply means 67 is provided with a pickup mechanism 69 facing the bottom oil reservoir 68 of the closed container 50 at the lower end of the rotary shaft 57, and has a refueling passage 70 penetrating vertically inside the rotary shaft 57.
On the other hand, this oil supply passage is connected all the way to the part corresponding to the oil supply point of the rotating shaft 57.
The oil in the oil reservoir 68 is pumped up by the pickup mechanism 69,
Each oil supply point is supplied with oil from the oil supply passage 70.

A bearing body 71 is provided at the lower part of the frame 54, and this bearing body supports a second rolling bearing 65. second part of vomit
An annular oil chamber 72 extending in the circumferential direction is formed on the outer periphery of the rotating shaft 57 facing the lower end side of the rolling bearing. A part of the bearing body 71 facing the lower part of the inner ring 74 at 65 is cut out, a thrust plate 75 is installed in this cutout, and between this plate and the inner ring 74, the inner ring 74 and the outer ring of the second rolling bearing 65 are inserted. A groove 78 is formed in which oil can be supplied to the sphere 77 interposed between the bearing body 71 and the inner peripheral surface 80 of the thrust plate 75 and the rotating shaft 57. The gap is set small to prevent the oil supplied to the oil chamber 72 from flowing downward through the gap.

In the compressor bearing device of this structure, the pickup mechanism 69 of the oil supply means 67 allows the oil supply passage 70 and the branch passage 73 to
The oil supplied to the oil chamber 72 through the oil chamber 72 is supplied to the sphere 77'llC between the inner and outer rings 74 and 76 of the second rolling bearing 65.
This prevents the windings from falling onto the windings of the motor section 550 through the gap between them and causing deterioration and damage to the windings.

(c) Problems to be Solved by the Invention However, the bearing body 71 of the frame 54 has a groove 78 between it and the lower end of the inner ring 74 of the second rolling bearing 65 that supplies oil to the sphere 77 of the second rolling bearing. Since it is necessary to secure a clearance between the inner ring 74 of the second rolling bearing 65 and the inner ring 74 of the second rolling bearing 65 to move due to the axial load applied to the one-rotation shaft 57, the inner ring 7
When abnormal load is applied in the axial direction of the one-rotation shaft 57 without regulating the movement of the second rolling bearing 65, the inner ring 74 and the outer ring 76 become misaligned, causing the second rolling bearing 65 to malfunction.

The present invention is intended to solve the above-mentioned problems, and aims to prevent the function of the rolling bearing from deteriorating and to simplify the mounting operation during one assembly.

B.) Means for Solving the Problems This invention comprises a bearing portion including an inner ring fitted to a rotating shaft, an outer ring attached to a frame, and a rolling body rotatably held between the outer ring and the inner ring. The frame is provided with a flange located below the bearing, and this flange extends inward from the outer circumference of the inner ring of the bearing, with a gap provided between it and the lower end surface of the inner ring. be.

(e) Effect This invention is configured as described above.

The flange part located at the bottom of the bearing part is extended inward from the outer circumference of the inner ring of this bearing part, and a gap is provided between the inner ring and the flange part to absorb dimensional errors during assembly.
In addition, the movement of the inner ring of the bearing is restricted by the flange, so that even if an abnormal load is applied to the rotating shaft in the axial direction, there will be no scratches between the inner and outer rings of the bearing that would deteriorate the bearing function. be.

(f) Example This invention will be explained below based on the example shown in FIGS. 1 and 2.

Reference numeral 1 denotes a closed container, and this container is composed of a cylindrical case 3 to which the electric motor section 2 is attached, an upper lid body 5 to which the scroll compressor section 4 is attached, and a lower lid body 7 having an oil reservoir 6 in which oil is stored. has been done.

A frame 8 fixed to the scroll compressor section 4 is mounted on the upper end surface of the cylindrical case 3. A rolling bearing portion 10 for pivotally supporting the rotating shaft 9 is provided at the center of the frame. This bearing part has an inner ring 11 fitted to the rotating shaft 9.
, an outer ring 12 attached to the frame 8, and a cylindrical rolling body 13 rotatably held between the inner ring and the outer ring. The electric motor section 2 includes a stator 14 attached to the inner wall of the cylindrical case 3, and a rotor 16 inserted into the rotating shaft 9 through an air gap 15 inside the stator. The scroll compressor section 4 is composed of a fixed scroll 17 and an orbiting scroll 18. The fixed scroll 17 has a disc-shaped end plate 19 that partitions the inside of the closed container 1 into upper and lower parts, an annular wall 20 that projects from the periphery of one side of this end plate, and is surrounded by the annular wall and is surrounded by the end plate 19. It is composed of a spiral wrap 21 formed of an upright involute shape or a curved line approximating the involute shape.

A discharge hole 22 is provided in the center of the end plate 19 of the fixed scroll 17. The fixed scroll 17 is fixed to a mounting leg 23 on the periphery of the frame 8 with bolts 24, with the annular wall 20 and the wrap 21 facing downward. The orbiting scroll 18 includes an end plate 25, a spiral wrap 26 formed of an involute shape or a curved line approximating the involute shape, which is provided upright on one surface of the end plate, and a spiral wrap 26 formed in the center of the other protruding surface of the end plate 25. It is configured with a pin portion 27 provided therein. The orbiting scroll 18 is configured such that the projecting direction of the wrap 26 is upward, and the wrap faces and engages with the wrap 21 of the fixed scroll 17 to form a plurality of compression spaces 28 inside. 29 is a pin portion 27 of the orbiting scroll 18 provided at the tip of the rotating shaft 9.
The center of this boss hole is eccentric to the axis of the rotating shaft 9. 30 is fixed scroll 1
This is an Oldham ring that revolves the orbiting scroll 18 on a circular orbit so as not to apparently rotate. A suction passage 31 that guides refrigerant to the scroll compressor section 4 is formed on the outer periphery of the frame 8 . 32 is a suction pipe, and this suction pipe opens into the closed container 1 below the motor section 2. 33 is a refrigerant guide member attached to the lower end of the stator 14.

This guide member guides the refrigerant flowing from the suction pipe 32 to the air gap 15 of the motor section 2. 34 is the upper lid body 5
This discharge pipe is attached to the upper space 35 formed by the upper lid body 5 and the end plate 19 of the fixed scroll 17.
It is open to Reference numeral 36 denotes an oil supply hole provided in the rotating shaft 9, and this oil supply hole communicates with a lead-out hole 37 provided in the inner ring 11 of the rolling bearing portion 10.

Reference numeral 38 denotes a seven-wrap portion provided integrally with the frame 8, and the seven-wrap portion is located below the rolling bearing portion 10, and has an inner circumferential end 39 located inward from the outer circumference of the inner ring 11. Further, the flange portion 38 is connected to the rolling bearing portion 1
It is provided in contact with the lower end of the outer ring 12 of No. 0, and with a gap 40 between it and the lower end of the inner ring 11. This gap is set to be within the allowable misalignment range 06 between the inner ring 11 and outer ring 12 of the rolling bearing 10.

In the compressor bearing device configured in this manner, when the electric motor section 2 is rotated, its rotational force is transmitted to the orbiting scroll 18 via the rotating shaft 9.

That is, the orbiting scroll 18 is connected to the boss hole 29 of the rotating shaft 9.
It is driven by a pin portion 27 inserted eccentrically with respect to the axis of the rotating shaft, and is caused to revolve on a circular orbit with respect to the fixed scroll 17 by an Oldham ring 35 so as not to apparently rotate. and.

The fixed scroll 17 and the orbiting scroll 18 gradually reduce the closed space 28 formed by these scrolls from the outside to the inside, and flow into the closed container 1 from the suction pipe 37 to fill the air gap of the electric motor section 2. frame 8 through 15
The refrigerant flowing through the suction passage 31 on the outer periphery of the refrigerant is compressed. This compressed refrigerant is discharged from the discharge port 22 of the end plate 19 of the fixed scroll 17 into the upper space 35, and then discharged from the discharge pipe 34 to the outside of the closed container 1. Further, the oil in the oil reservoir 6 rises through the oil supply hole 36 due to the rotation of the rotating shaft 9.

A lead-out hole 37 provided in the inner ring 11 with which this oil supply hole communicates
It is supplied to the rolling bearing section 10 from above.

The flange portion 38 located below the rolling bearing portion 10 has an inner circumferential end 39 located inside the outer circumference of the inner ring 11, and a gap 40 is provided between the flange portion 38 and the lower end of the inner ring. It absorbs dimensional errors during assembly and simplifies installation work. In addition, by setting the gap 40 between the flange portion 38 and the inner ring 11 to 6 or less, which is the allowable range for the axial misalignment between the inner ring 11 and the outer ring 12 of the rolling bearing 10, abnormal axial loads are applied to the shaft 9 during one rotation. Even if the rotating shaft is rotated, the inner ring 11 attached to the rotating shaft does not deviate from the outer ring 12 by more than an allowable range, so that the function of the rolling bearing part 100 is not impaired.

By providing a gap 40 between the inner ring 11 of the rolling bearing 10 and the flange 38, the present invention provides the flange with a protective function for the rolling bearing 10, and also simplifies the installation work during assembly. This is how it was done.

In the above explanation, the rolling bearing part 10 is explained using the cylindrical rolling body 13, but it goes without saying that a spherical rolling body 41 as shown in FIG. 3 can also have the same effect.

(g) Effects of the Invention The bearing device for a compressor of the present invention has a bearing part that is rotatably held between an inner ring fitted to a rotating shaft, an outer ring attached to a frame, and an inner ring. The frame is provided with a flange portion located below the bearing portion, and this flange portion extends inward from the outer circumference of the inner ring of the bearing portion, and a gap is provided between it and the lower end surface of the inner ring. Therefore, by providing a gap between the inner ring of the bearing and the flange, it is possible to absorb dimensional errors when assembling the bearing, simplify the installation work, and prevent abnormal axial loads from being applied to the rotating shaft. Even if the bearing is added, the movement of the inner ring of the bearing can be restricted, and the bearing function of the bearing can be prevented from deteriorating.

[Brief explanation of the drawing]

1 and 2 show the present invention, FIG. 1 is a vertical sectional view of a scroll compressor, FIG. 2 is an enlarged sectional view of the main part of a bearing, and FIG. 3 is a bearing showing another embodiment. Enlarged cross-sectional view of the week part of
4 and 5 show a conventional example, and FIG. 4 is a longitudinal sectional view of a scroll compressor. FIG. 5 is an enlarged sectional view of the main part of the bearing section. 1... Airtight container, 2... Electric motor section, 4...
Scroll compressor section, 8... frame, 9...
・Rotating shaft, 10... Rolling bearing part, 11... Inner ring, 12... Outer ring, 13... Rolling body, 38...
Flange part, 40... Gap.

Claims (2)

[Claims] 1. A closed container includes an electric motor section, a compressor section driven by a rotating shaft of the electric motor section, and a bearing section that is provided between the compressor section and the electric motor section and supports the rotating shaft in the center. The bearing part is composed of an inner ring fitted to the rotating shaft, an outer ring attached to the frame, and a rolling body rotatably held between the outer ring and the inner ring. In a bearing device for a compressor having a flange located below the bearing, the flange of the frame is extended inward from the outer periphery of the inner ring of the bearing, and a gap is provided between it and the lower end surface of the inner ring. A compressor bearing device characterized by: 2. 2. A bearing device for a compressor according to claim 1, wherein the gap is set to 1/2 or less of the allowable movement width of the bearing portion in the axial direction.