JP2583685B2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor having a fixed scroll and a movable scroll and configured to compress a sucked fluid and discharge the fluid outside a casing.

[0002]

2. Description of the Related Art Usually, a scroll compressor has a crankshaft for driving a movable scroll in a casing. As disclosed in Japanese Patent Application Laid-Open No. S59-115488, rolling bearings and sliding bearings are used for the bearing support structure of the crankshaft.

FIG. 3 shows an example of a bearing support structure using a rolling bearing. Here, one end (the eccentric bush 5) of the crankshaft 6 is fitted to a thrust rolling bearing 13 provided on the movable scroll 3.
Then, in order to support the intermediate portion of the crankshaft 6 on the frame 8, the rolling bearing 9 is provided at a position close to the crank portion, and the sliding bearing 1 is provided at a position further away from the crank portion.
2 are provided. The eccentric bush 5 is provided for turning the movable scroll 3, and the counterweight 11 is provided for adjusting the amount of unbalance due to the turning movement of the movable scroll 3.

[0004] Also, the bearing support structure shown in Figure 2, without using the thrust rolling bearing 13 as shown in FIG. 3, the bearing 14 sliding between the movable scroll 3 and the eccentric bushing 5 is interposed. The slide bearing 14 is formed integrally with the orbiting scroll 3. The orbiting scroll 3 is provided with a fluid passage H for guiding the compressed high-pressure fluid to the crank chamber. The bearing support structure shown in FIG. 2 is that of a hermetic scroll compressor.

In such a scroll compressor, regardless of the bearing support structure, when the crankshaft 6 is rotated by the driving of the motor, the movable scroll 3
Are linked to each other to give a compressive force to the fluid by orbiting with respect to the fixed scroll 4. Then, the fluid is guided to the discharge section and the crank chamber, and is discharged to the outside of the casing through a pipe (not shown) provided in the casing.

[0006]

In the conventional scroll compressor, even if any of the above-described bearing support structures is employed, the structure becomes complicated, and therefore the productivity is not improved and the cost is increased. Problem.

More specifically, in assembling such a scroll compressor, after inserting a crankshaft from a compression element side into a casing, a rotor portion of the motor is press-fitted (shrink fit) to the crankshaft. Generally, scroll compressors are structurally complex and use large parts,
The assembling process requires a great deal of trouble, and it is also difficult to disassemble after assembling once. In particular, in the assembly process, each part must be handled with care for damage to the bearing.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a scroll compressor that can be used with a simple configuration and can be used stably, and that can be easily assembled and disassembled. .

[0009]

According to the present invention, a casing, a compression element comprising a fixed scroll fixed in the casing and a movable scroll orbiting with respect to the casing, and a drive element for driving the movable scroll are provided. A shaft fixed to the casing, and a rolling bearing rotatably supporting the crankshaft on the frame, wherein the rolling bearing includes an annular outer body on the frame side, and the crankshaft. A scroll compressor having a side annular inner body and a rolling element between the annular outer body and the annular inner body, wherein the crankshaft extends in a direction perpendicular to an axial direction, and Of the body against the compression element side
The compression element and the flange
Between the annular inner body and the axial end face compression element side.
Providing a retaining ring provided on the crankshaft in contact therewith
Thus , a scroll compressor is obtained. or,
According to the present invention, the retaining ring is an elastic retaining ring
The scroll compressor according to claim 1, wherein
It is.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The scroll compressor of the present invention will be described in detail below with reference to embodiments. FIG. 1 shows a basic configuration of a scroll compressor according to one embodiment of the present invention.

As shown in FIG. 1, the scroll compressor comprises a casing 1, a fixed frame 8 and a fixed scroll 4, a movable scroll 3 orbiting with respect to the fixed scroll 4, and a crankshaft 6. Each has it. The casing 1 has a discharge chamber 2 formed therein. An eccentric bush 5 is provided at an end of the crankshaft 6 on the movable scroll 3 side. The eccentric bush 5 is fitted to a cylindrical portion 3a provided on the movable scroll 3 via a radial bearing.

The crankshaft 6 is rotatably supported by a frame 8 via a rolling bearing 9. The rolling bearing 9 includes an annular outer body 9 a fitted and fixed to the frame 8.
And an annular inner body 9b disposed coaxially within the annular outer body 9a and abuttingly fixed to the crankshaft 6, and arranged in a ring shape between the annular outer body 9a and the annular inner body 9b. Provided with a large number of spheres 9c as rolling elements. Each sphere 9c locks the annular outer body 9a and the annular inner body 9b in the axial direction. As a result, the annular outer body 9a and the annular inner body 9b do not shift from each other in the axial direction.

The crankshaft 6 has first and second contact portions 6a and 6b formed near the rolling bearing 9. The first contact portion 6a is a flange surface formed on the crankshaft 6, and is in contact with one axial end surface of the annular inner body 9b of the rolling bearing 9. The second contact portion 6b is one end surface in the axial direction of an elastic retaining ring 100 such as a snap ring provided on the crankshaft 6, and this one end surface is opposed to the other end surface in the axial direction of the annular inner body 9b. In contact.

The other end surface of the elastic retaining ring 100 is connected to an edge (small flange surface) 6 c provided on the crankshaft 6.
Is in contact with The motor unit (the rotor 7 and the stator 15) in the scroll compressor includes a crankshaft 6
Is for driving to rotate. The fixed scroll 4 and the movable scroll 3 can be collectively regarded as compression elements. The counterweight 11 is provided to adjust the amount of unbalance due to the turning motion of the orbiting scroll 3.

In the scroll compressor having such a configuration, the bearing support structure of the crankshaft 6 is modified so that the first contact portion 6a and the second contact portion 6
By forming b, the movement of the crankshaft 6 in the axial direction is prevented, so that when the crankshaft 6 is rotated by the motor unit, the movable scroll 3 moves relative to the fixed scroll 4 in conjunction with this rotation. And the fluid can be compressed with good stability. In addition, the scroll compressor can be easily assembled and disassembled as described in detail below.

For example, the frame 8 is previously placed in the casing 1.
The assembly process of the scroll compressor will be briefly described assuming that the scroll compressor is incorporated. First, the rotor 7 is press-fitted into the crankshaft 6 and the rolling bearing 9 is attached to the frame 8. An elastic retaining ring 100 is attached to the crank chamber side near the body 9b. Then, the counterweight 11 and the eccentric bush 5 are fixed by mounting means such as press fitting or clearance fit, and then the compression element is assembled. Or,
When disassembling the scroll compressor thus assembled in the event of a failure or the like, the crankshaft 6 can be easily removed from the frame 8 by disassembling the compression element, the eccentric bush 5, the counterweight 11, and the elastic retaining ring 100 in this order. Can be.

[0017]

As described above, according to the scroll compressor of the present invention, assembling and disassembling can be easily performed without impairing the basic performance of compressing a fluid with good stability. Become. Therefore, it is possible to improve both productivity and convenience in use. At the same time, parts can be easily replaced. In particular, in the process of assembling the scroll compressor, after the rotor portion is press-fitted into the crankshaft, it can be subsequently assembled into the frame, and when disassembled, the eccentric bush, the counterweight, and the elastic retaining ring are operated in this order. For example, the crankshaft can be easily removed from the frame. That is, there is a special advantage in that the risk of damage to each bearing during assembly and disassembly can be minimized.

[Brief description of the drawings]

FIG. 1 shows a configuration of a scroll compressor according to an embodiment of the present invention.

FIG. 2 is a bearing support structure in a conventional scroll compressor .
It is shown.

FIG. 3 shows bearing support in another conventional scroll compressor.
It shows the structure.

[Explanation of symbols]

 Reference Signs List 1 casing 2 discharge chamber 3 movable scroll 4 fixed scroll 5 eccentric bush 6 crankshaft 6a first contact portion 6b second contact portion 7 rotor 8 frame 9, 13 rolling bearing 9a annular outer body 9b annular inner body 9c spherical body DESCRIPTION OF SYMBOLS 11 Counter weight 12, 14 Sliding bearing 15 Stator 100 Elastic retaining ring

Claims (2)

(57) [Claims] 1. A casing, a compression element comprising a fixed scroll fixed in the casing and a movable scroll orbiting with respect to the casing, a crankshaft for driving the movable scroll, and fixed in the casing. A frame, and a rolling bearing rotatably supporting the crankshaft on the frame,
The rolling bearing is a scroll compressor having the frame-side annular outer body, the crankshaft-side annular inner body, and a rolling element between the annular outer body and the annular inner body. Extends in a direction perpendicular to the axial direction, and is opposed to an axial end face of the annular inner body.
Form a flange that contacts the compression element side, and
Between the compression element and the flange,
The crankshaft in contact with the axial end face compression element side
A scroll compressor provided with a retaining ring provided on a scroll compressor. 2. The scroll compressor according to claim 1, wherein said retaining ring is an elastic retaining ring.