JPH0726620B2 - Scroll compressor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor in which an orbiting scroll shaft is eccentrically supported in a main shaft, and a thrust bearing is provided between the orbiting scroll and the main shaft.

2. Description of the Related Art FIG. 2 shows an example of a schematic structure of a conventional scroll compressor.

The main shaft 2A is pivotally supported by bearings 9A and 24 fitted to the intermediate wall 7A of the casing 26A and the rear cover 8A, and is housed in the casing 26A. An eccentric crankshaft 22 is provided on one end side (lower end side in the figure) of the main shaft 2A, and an orbiting scroll 16 is pivotally mounted on the crankshaft 22 via a bearing 23. A pair of balancers 12A and 13A are fixed to the main shaft 2A, and a rotor 14A is fixed. The rotor 14A engages with the stator 15A fixed to the casing 26A to rotate the main shaft 2A. The wrap 16a of the orbiting scroll 16 engages with the wrap 19a of the fixed scroll 19 fixed to the casing 26A, compresses the medium introduced from the suction port 20 and discharges it from the discharge port 21. An Oldham's joint 18 for restraining its rotation is engaged with the groove 17 on the upper surface of the orbiting scroll 16. Sealing members 11A and 11B are inserted into the intermediate wall 7A to cut off communication between the chamber in which the orbiting scroll 16 is stored and the chamber in which the rotor 14A and the like are stored.

Problems to be Solved by the Invention The orbiting scroll 16 orbits by an orbiting radius by the rotation of the main shaft 2A, and the thrust direction support at this time is the shoulder portion 25 of the casing 2A and the flange portion of the end plate 16b of the orbiting scroll 16. It is carried out by contact with. Further, since the orbiting scroll 16 is pivotally supported by the crankshaft 22 as described above, the play in the thrust direction of the orbiting scroll 16 is affected by the axial length of the crankshaft 22, the size of the gap with the bearing 23, and the like.
Generally, the crankshaft 22 has a short axial length and the bearing 23 also has a certain gap, so that the orbiting scroll 16 has some rattling in the thrust direction. For this reason the casing
A pressing force is applied to the shoulder portion 25 and the bearing 23 of 26A. As a result, the smooth movement of the orbiting scroll 16 is impaired, and the service life of the bearing 23 and the like is shortened.

The present invention solves the above-mentioned problems, in which the orbiting scroll is moved smoothly and mechanical loss is reduced,
An object of the present invention is to provide a scroll compressor that can improve the life of bearings and the like.

For this purpose, the present invention provides a main shaft (2) which is pivotally supported substantially at the center of the casing (26) and eccentrically forms a through hole (3) by a turning radius, and the through hole (3). A scroll compressor having an orbiting scroll shaft (1) pivotally supported in a hole (3) and having an orbiting scroll (16) connected to one end side thereof, the orbiting scroll (16) of the main shaft (2). And a thrust bearing (4) is interposed between the end face on the side and the flat face on the spindle side of the orbiting scroll (16) to form a scroll compressor.

Action The thrust bearing of the orbiting scroll is reduced by the bearing and the thrust bearing that are provided in the main shaft so as to be separated from each other in the axial direction, and smooth movement is possible, the pressing force on the bearing is reduced, and the life is improved. It will be possible.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the main shaft 2 is housed in the casing 26, and the main shaft 2 is provided with the intermediate wall 7 and the rear cover 8 of the casing 26.
It is pivotally mounted to the casing 26 via bearings 9 and 10 which are fitted therein and which can carry thrust and radial loads.
A through hole 3 is provided in the main shaft 2 along the axial direction, and the through hole 3 is formed eccentrically by the turning radius. The orbiting scroll shaft 1 is pivotally supported in the through hole 3 by bearings 5 and 6. The bearings 5 and 6 have a structure capable of receiving thrust and radial loads, and are arranged apart from each other in the axial direction of the main shaft 2. An orbiting scroll 16 is fixed to one end of the orbiting scroll shaft 1. A pair of balancers 12, 13 are fixed to the outer periphery of the main shaft 2 and a rotor 14 is fixed. The rotor 14 is fixed to the casing 26 and the stator 15 is fixed.
To rotate the main shaft 2. The wrap 16a of the orbiting scroll 16 is a fixed scroll 1 fixed to the casing 26.
The medium introduced from the suction port 20 is compressed by engaging with the lap 19a of 9 and discharged from the discharge port 21. A seal member 11 is attached to the intermediate wall 7 in order to block communication between the chamber in which the orbiting scroll 16 is stored and the chamber in which the rotor 14 and the like are stored. Also, in order to restrain the rotation of the orbiting scroll 16, the Oldham coupling is used.
18 are provided.

A thrust bearing 4 is provided between the upper end surface of the orbiting scroll 16 in the drawing and the end surface of the main shaft 2 facing the orbiting scroll 16. That is, the thrust force of the orbiting scroll 16 is supported by the end surface of the main shaft 2 via the thrust bearing 4. Therefore, the orbiting scroll 16
Flange part of the end plate 16b and shoulder part 25 of the casing 26
No contact with is required.

With the above structure, when the main shaft 2 is rotated, the orbiting scroll shaft 1 moves so as to follow the movement of the main shaft 2, and the orbiting scroll 16 is orbitally moved. That is, the orbiting scroll shaft 1
The whole is eccentrically moved to operate the orbiting scroll 16. The orbiting scroll 16 is supported by the thrust bearing 4 and can move smoothly, and since the orbiting scroll shaft 1 supports the thrust force by the bearings 5 and 6 separated from each other, the rattling in the thrust direction of the orbiting scroll 16 is within an extremely small value. There is no restriction and unreasonable pressing force. As described above, the orbiting scroll 16 smoothly orbits, and the mechanical loss is significantly reduced. Since the orbiting scroll 16 is supported by the bearings 5 and 6 and the thrust bearing 4 which are separated from each other,
Only a very small pressing force acts on 5, 6 and 4, and the life can be greatly improved. Further, as described above, the end plate 16b of the orbiting scroll 16 and the shoulder portion 25 of the casing 26 are provided.
Since it is not necessary to make contact with and, the orbiting scroll 16 can be formed in a small size and light weight, and the mechanical efficiency can be improved.

EFFECTS OF THE INVENTION As is clear from the above description, according to the present invention, it is possible to smoothly move the orbiting scroll, and it is possible to improve the mechanical efficiency and the life of the bearing and the like.

[Brief description of drawings]

FIG. 1 is an axial sectional view of an embodiment of the present invention, and FIG. 2 is an axial sectional view showing a schematic structure of a conventional scroll compressor. 1 ... Orbiting scroll shaft, 2,2A ... Main shaft, 3 ... Through hole, 4 ... Thrust bearing, 5,6,9,9A, 10,23,24 ... Bearing, 7,7A ... Intermediate wall , 8,8A …… Rear cover, 11,11a, 11b…
… Seal member, 12,12A, 13,13A …… Balancer, 14,14A…
… Rotor, 15,15A …… Stator, 16 …… Orbiting scroll, 16a, 19a …… Lap, 16b …… End plate, 17 …… Groove, 18…
… Oldham coupling, 19 …… Fixed scroll, 20 …… Suction port, 21 …… Discharge port, 22 …… Crankshaft, 25 …… Shoulder part, 26,26A …… Casing.

Claims (1)

[Claims] 1. A main shaft (2) which is pivotally supported substantially at the center of a casing (26) and eccentrically forms a through hole (3) by a turning radius, and a main shaft (2) pivotally supported in the through hole (3). A scroll compressor having an orbiting scroll shaft (1) having an orbiting scroll (16) connected to one end side, the end face of the main shaft (2) on the orbiting scroll (16) side, and the orbiting scroll (16). ) A scroll compressor, characterized in that a thrust bearing (4) is interposed between the flat surfaces on the main shaft side of (1).