JPS61291793A - Scroll compressor - Google Patents

Abstract

PURPOSE:To lubricate securely slide portions of a bearing frame and an Oldham's coupling by opening an end of a oil return hole of the bearing frame to a position above the lower surface of an annular portion of the Oldham's coupling. CONSTITUTION:A bearing frame 8 of a scroll compressor is formed with a peripheral groove receiving an Oldham's coupling 13 and communicating to a oil return hole 25 for returning lubricating oil supplied from a spindle 6 to an oil reservoir 15 on the bottom in an enclosed shell 12. And an opening of the oil return hole 25 to the peripheral groove is provided above the lower surface 13e of an annular portion 13c of the Oldham's coupling 13 so that lubricating oil is always reserved on the slide surfaces of the bearing frame 8 and Oldham's coupling 13 for secure lubrication of said portions.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a scroll compressor used for compressing refrigerant gas in refrigeration systems and air conditioners.

[Conventional technology]

First, the principle of a scroll compressor will be briefly described. Figures 6a, b* Og d show the basic components and compression principle of a scroll compressor. In each figure in Figure 6,
1 is a fixed scroll, 2 is an oscillating scroll, 3 is a suction chamber, 4 is a discharge boat, 5 is a compression chamber, and O is the center of the fixed scroll 1. The fixed scroll 1 and the oscillating scroll 2 have spirals having the same shape and opposite winding directions, and the shape of these spirals is composed of an impoliate curve, a circular arc, etc., as is conventionally known. Next, the operation will be explained. In each figure of FIG. 6, the fixed scroll 1 is stationary with respect to space, and the oscillating scroll 2 has its spirals combined with each other with a phase shift of 180° relative to the fixed scroll 1, and the center O of the fixed scroll 1.
Performs orbital motion without rotating around the axis, and reaches 0° in Figure 6 a.
, 90° of b. It moves like 180° in C and 270° in d. In the state of Oo in FIG. 6a, gas confinement in the suction chamber 3 is completed and the compression chamber 5 is formed. As the oscillating scroll 2 moves, the compression chamber 5 gradually reduces its volume as shown in FIG. Discharge boat 4 provided
is discharged from. Next, the specific configuration and operation of a conventional scroll compressor will be explained. Figure 7 shows, for example, Japanese Patent Application Laid-Open No. 59-224.
FIG. 4 is a vertical cross-sectional view of a scroll compressor shown in Japanese Patent No. 493. In FIG. 7, 1 is a fixed scroll, 2 is an oscillating scroll, 3 is a suction chamber, 4 is a discharge boat, 5 is a compression chamber, 6 is a main shaft, 7 is an oil cap provided at the lower end of the main shaft 6, 8 and 9 are upper and lower bearing frames that support the main shaft 6; 10 is a motor rotor fixed to the main shaft 6; 11 is a motor stator; and 12 is a shell that accommodates the above-mentioned members. Reference numeral 13 denotes an Oldham joint that is combined with the upper bearing frame 8 and prevents the rotation of the oscillating scroll 2 and allows the oscillating movement to occur.
4 is a baffle plate, 15 is an oil reservoir formed in the lower part of the shell 12, 16 is a gas suction pipe, 17 is a discharge pipe, 18 is a main shaft 6
1 is an oscillating bearing that rotatably supports the oscillating scroll transport 2a provided eccentrically; 19 is a main bearing that rotatably supports the upper part of the main shaft 6; 20 is an electric motor that rotatably supports the middle portion of the main shaft 6; ! lJ@ side bearing, 21 is a thrust bearing that supports the orbiting scroll 2 in the axial direction, 22 is an insert last bearing that supports the main shaft 6 in the axial direction, 23 is an oil supply hole provided in the main shaft 6, and 24 is the main shaft 6 Gas vent hole provided in 25.2
6 is an oil return hole for the oil path, and 27.28 is a communication hole for the suction gas path. The end plate 2c of the oscillating scroll 2 is formed with an Oldham joint sliding groove 2b as shown in FIG. 8, and the upper bearing frame 8 is also formed with an Oldham joint groove 8a as shown in FIG. As shown in FIG. 9, the Oldham joint 13 is provided with a pair of claws 13a facing each other on the upper surface of an annular portion 13c.
A pair of claws 13b are provided on the lower surface of the annular portion 13c and are offset by 90" from the claws 13a, and the claws 13a and 13b are slidably engaged with the Oldham joint grooves 2b and 8a, respectively. Note that 13
d is the sliding surface of the Oldham joint 13. Next, the operation of this scroll compressor will be explained. When the electric motor rotor 10 rotates, the oscillating scroll 2 begins to revolve around the main shaft 6, and compression of the refrigerant gas is started according to the operating principle shown in FIG. 6 described above. At this time,
The refrigerant is sucked into the compressor from the suction pipe 16, and as shown by the solid arrow in FIG. After passing through the motor gap and cooling the electric motor, the air passes through the communication hole 28 and is taken into the compression chamber 5 from the suction chamber 3 and compressed. The compressed gas passes through the discharge boat 4 and is discharged from the discharge pipe 17 to the outside of the compressor. Further, lubricating oil is supplied from the oil reservoir 15 to each bearing 18, 19°, 20°, 22° by centrifugal pump action by the oil cap 7 provided on the main shaft 6 and the oil supply hole 23 as shown by the broken line arrow in FIG. After oil is supplied to the sliding portion of the thrust receiver 21 and used for lubrication, it is returned to the oil reservoir 15 in the lower part of the shell 12 mainly through oil return holes 25 and 26 provided in the bearing frames 8 and 9. At this time, the oil in the upper bearing frame 8 leaks to the oscillating scroll 2 of the Oldham joint 13.
And the sliding parts with the bearing frame 8 are lubricated. Further, the slotted hole 24 provided in the main shaft 6 quickly discharges gas in the oil cap 7 to the outside of the main shaft 6 when the compressor is operated, thereby increasing pump efficiency.

[Problems to be solved by the invention]

In the conventional scroll compressor as described above, the lubricating oil discharged from the thrust bearing 21 to the bearing frame 8 immediately passes through the oil return holes 25 and 26 and is returned to the oil sump 15. For this reason, sufficient oil cannot be supplied to the Oldham joint sliding grooves 2b and 8a provided in the swinging scroll 2 and the bearing frame 8, and the Oldham joint sliding surface 13d and the Oldham joint sliding groove 2b. There was a problem that the 8a wall was worn out or seized. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a scroll compressor that can supply sufficient oil to the sliding portions between the Oldham joint, the oscillating scroll, and the bearing frame.

[Means to solve the problem]

In the scroll compressor according to the present invention, the oil return hole provided in the bearing frame is opened above the annular lower surface of the Oldham joint.

[Effect]

The oil return hole of the scroll compressor in this invention temporarily stores the lubricating oil discharged from the thrust bearing in the bearing frame, thereby sufficiently lubricating the sliding parts between the scroll, the oscillating scroll, and the bearing frame and the Oldham joint. can do.

【Example】

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. 2 is a plan view of the upper bearing frame 8, and FIGS. 3 and 4 are cross-sectional views taken along lines IV-111 and IV-IV in FIG. 1 is a partially enlarged view of FIG. 3. In this embodiment, as shown in FIGS. 1 to 4, the opening 25a of the oil return hole 25 provided on the upper bearing frame 8 is connected to the annular portion 13c of the Oldham joint 13 installed on the upper bearing frame 8.
The oil return hole 25 is located above the height of the lower surface 13e.
The peripheral wall 8b is made to protrude upward in a cylindrical shape. The configurations of this embodiment other than those described above are shown in FIGS. 7 to 10.
It is similar to the conventional one shown in the figure. Next, the operation of the scroll compressor of this embodiment will be explained. Similar to the conventional one shown in FIG.
The lubricating oil inside is supplied to each bearing 18, 1 by centrifugal pump action by an oil cap 7 provided on the main shaft 6 and an oil supply hole 23.
9. The sliding parts of the thrust receiver 21 are supplied with oil, and the oil used to lubricate them is returned from the oil return hole 25 through the thrust receiver 21. In this case, in this embodiment, since the opening 25a of the oil return hole 25 is higher than the annular lower surface 13e of the Oldham joint 13, the lubricating oil returned to the oil return hole 25 through the thrust receiver 21 is temporarily deposited on the upper bearing frame 8. A part of the lubricating oil is collected and passes through the minute gap 29 between the upper bearing frame 8 and the annular lower surface 13e of the Oldham joint 13, and is transferred between the sliding surface of the Oldham joint 13 and the Oldham joint sliding groove 8a of the bearing frame 8. can be reliably refueled. Furthermore, oil can be supplied to the Oldham joint sliding groove 2b of the swinging scroll 2 through the annular upper surface 13f of the Oldham joint 13 by reciprocating the Oldham joint 13. Therefore, in the conventional one,
The oil used for lubrication is returned from the oil return hole 25 in a short time without accumulating in the upper bearing frame 8, and is returned to the Oldham joint sliding surface 13c and the Oldham joint slide provided on the swinging scroll 2 and the upper bearing frame 8. Unlike the case where the sliding parts with the walls of the moving grooves 2b and 8a were insufficiently lubricated, in this embodiment, the sliding parts can be sufficiently lubricated. In addition, in this invention, as shown in FIG. An opening 25a of the hole 25 may be provided,
Further, the area near the opening of the oil return hole 25 on the lower surface 13e of the Oldham joint of the upper bearing frame 8 may be formed by casting or the like.

【Effect of the invention】

As explained above, according to the present invention, the opening of the oil return hole provided in the bearing frame is provided at a higher position than the annular lower surface of the Oldham joint, so that the sliding surface of the Oldham joint, the oscillating scroll, and the bearing By being able to sufficiently lubricate sliding parts such as the Oldham joint sliding groove wall provided on the frame, it reduces wear on the sliding parts and prevents seizure of the sliding parts. You can get the effect that you can.

[Brief explanation of drawings]

FIG. 1 is a partial vertical cross-sectional view of the essential parts of a scroll compressor according to an embodiment of the present invention, FIG. 2 is a plan view of the bearing frame portion of the same embodiment, and FIGS. 3 and 4 are Oldham's III-III in Fig. 2 combining the joints! , IV
-IV line sectional view, Fig. 5. Partial vertical sectional view of the μs section of the scroll compressor according to another embodiment of the Hakono invention, Fig. 6a.
tt1we, d are principle explanatory diagrams showing mutually different states of the scroll compressor, FIG. 7 is a vertical cross-sectional view showing a conventional scroll compressor, FIG. 8 is a perspective view of the same oscillating scroll, and FIG. A perspective view of the Oldham joint, and FIG. 10 is a cross-sectional perspective view of the same bearing frame portion. No. 1: fixed scroll, 2 fist φ: swinging scroll, 2a fist: swinging scroll shaft, 2b: Oldham joint sliding groove (sliding part), 5: compression chamber, 6:
...Main shaft, 8...Bearing frame, 8a...Oldham joint sliding groove (sliding part), 12...Shell, 1
3... Oldham joint, 13a, 13b... claw,
13c...Annular part, 13d...Sliding surface (sliding part), 25...Oil return hole, 25m...Opening, 3
0...Oil return pipe. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa (and 2 others) 4 spears 3!1m Procedural amendment (voluntary)

Claims (2)

[Claims] (1) A fixed scroll and an oscillating scroll that combine spirals such as involutes to form a compression chamber eccentrically, a pongee frame for the main shaft that eccentrically supports the oscillating scroll shaft, and an annular shape that is combined with this bearing frame. The annular part has a pair of pawls on one surface of the part and a pair of pawls on the other surface of the annular part at a position 90 degrees apart from these pawls, thereby preventing the oscillating scroll from rotating on its axis and allowing the oscillating movement. A scroll compressor equipped with an Oldham joint, characterized in that the oil return hole provided in the bearing frame is opened at a position above the height of the annular lower surface of the Oldham joint installed on the bearing frame. scroll compressor. (2) The scroll compressor according to claim 1, wherein the oil return hole is formed by an oil return pipe that is fitted and fixed to the bearing frame.