JPH033988A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prevent the seizure and abrasion of a bearing and improve the life and reliability of a scroll compressor by using a sliding bearing impregnated and baked with graphite and resin on a sintered bimetal for a bush material supporting a rotary shaft. CONSTITUTION:The load applied to slide sections 10b and 10c through a swirl scroll 3, a sliding bearing 9 and the eccentric section 10a of a rotary shaft 10 is received by sliding bearings 12 and 13. The biased contact of the rotary shaft 10 with the upper section of the upper sliding bearing 12 and the lower section of the lower sliding bearing 13 is increased, the formation of an oil film is made difficult, but sliding bearings 12 and 13 impregnated with graphite and resin on a sintered bimetal are used, they have the self-lubricating action and proper strength and heat resistance, thus the seizure and abrasion of sliding bearings 12 and 13 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a scroll compressor used in refrigerators such as air conditioners and refrigerators.

BACKGROUND ART FIG. 3 shows a vertical cross-sectional view of a conventional scroll compressor.

A scroll compressor is an orbiting scroll 3 having an end plate 4 and a wrap 7 that stands upright on the end plate 4 and is formed in an involute or a curve close to an involute.
A fixed scroll 2 having a configuration in which a discharge port 16 is added to the orbiting scroll 3 is engaged with each other with the wraps 6.7 facing inward, and the orbiting scroll 3 is interlocked with the frame 11 having a suction boat or the fixed scroll 2.
A rotary shaft 8 is engaged with the orbiting scroll 3 through an Oldham ring 15 that prevents rotation of the rotary scroll 3, and the orbiting scroll 3 is rotated by the rotary shaft 8 in an apparently non-rotating zelkova, which is formed by both scrolls 2.3. It compresses the fluid in a closed space. A scroll compressor of this type is disclosed, for example, in US Pat. No. 3,884,599. The rotating shaft 10 in this scroll compressor is normally arranged vertically, and its sliding parts 10b, l
The oc is supported by two upper and lower iron-based sliding bearings 12a and 13a, and the eccentric portion 10a is engaged with the orbiting scroll 3 via a sliding bearing 9. On the other hand, in this scroll compressor, the fluid pressure in the closed space formed by both scrolls 2.3 acts in the radial direction of the eccentric portion 10a of the rotating shaft 10 through the orbiting scroll 3.

Problem to be Solved by the Invention However, the rotating shaft 10 has a sliding bearing 12a facing it.
, 13a, the rotary ring 10 can move a small amount in the radial direction within the gap between the upper sliding bearing 12a supporting the sliding part 10c and the sliding part 1.
It moves in the lower sliding bearing 13a that supports 0b, and is strongly pressed against the respective bearings 12a and 13a in a one-sided state. As a result, each bearing 12a, 13
In case a, an oil film reaction force capable of responding to the load due to this fluid pressure could not be obtained, and the bearings 12a and 13a would sometimes suffer wear or seizure.

Means for Solving the Problems The present invention has been made based on the above-mentioned problems, and uses a sliding bearing made by impregnating and firing graphite and resin on a bimetal jointly sintered into the bearing, thereby achieving self-lubrication and appropriateness. It has great strength. Further, in order to ensure heat resistance against sliding heat, thermoplastic resin such as polyimide is used.

Function The function of the present invention is to prevent seizure and wear by the self-lubricating action of graphite under extremely severe lubrication conditions.

Example Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a scroll compressor equipped with an embodiment of the present invention, in which 1 is a chamber, 2 is a fixed scroll, and 3 is an orbiting scroll.

The fixed scroll 2 and the orbiting scroll 3 are engaged with each other with a disk-shaped end plate 4.5 and a spiral wrap 6.7 formed upright thereon facing inward. A shaft 8 is formed on the lower side of the orbiting scroll 3. This shaft 8 is connected to an eccentric portion 10 of a rotating shaft 10 via a sliding bearing 9.
a is engaged.

The sliding parts 10b and 10c of the rotating shaft 10 are supported by an upper sliding bearing 12 and a lower sliding bearing 13 mounted on the frame 11.The rotating shaft 10 is supported by an electric motor 14.
rotated by Due to this rotation of the rotating shaft 10, the orbiting scroll 3 is rotated by the Oldham ring 15, but apparent rotation is prevented. Due to this movement, gas is sucked into the fixed scroll 2 and the orbiting scroll 3 and compressed, and is discharged from the discharge port 16 into the chamber 17 and discharged from the discharge pipe 18. Due to the compressive action of the fluid confined by both scrolls 2.3, the load acting on the sliding parts 10b and 10c through the orbiting scroll 3, the sliding bearing 9, and the eccentric part 10a of the rotating shaft 10 is received by the sliding bearing 12.13. can be stopped. For this reason, the rotating shaft 10 has a large uneven contact with the upper part of the upper sliding bearing 12 and the lower part of the lower sliding bearing 13, making it difficult to form an oil film. As shown in Figure 1, the jointly sintered bimetal 19
Since the sliding bearing 12.13 is impregnated with graphite 20 and resin 21 on the top, it has a self-lubricating effect, and also has appropriate strength and heat resistance, so the sliding bearing 12.1
It can prevent seizure and wear of item 3.

Effects of the Invention As detailed above, the present invention improves the self-lubricating property of the bearings of scroll compressors.
Seizure and wear of the bearing can be prevented, and the life and reliability of the scroll compressor can be improved.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a scroll compressor equipped with an embodiment of the present invention, FIG. 2 is an internal sectional view of a journal bearing in the same compressor, and FIG. 3 is a vertical sectional view of a conventional scroll compressor. It is. 1...Chamber, 2...Fixed scroll, 3...Orbiting scroll, 4.5...
・End plate, 6.7... Lamp, 8... Shaft, 12.13... Sliding bearing, 14...
・Electric motor, 15...Oldham ring, 16...
...Discharge port, 19...Bimetal, 20.
...graphite, 21...resin.

Claims (3)

[Claims] (1) A pair of scroll members that vertically form wraps with spiral-shaped inner and outer surfaces on an end plate are engaged with each other with each wrap facing inward, and one scroll member is fixed while the other scroll member is fixed. The member orbits without rotating, the orbiting scroll member is engaged with an eccentric portion of a rotating shaft, and the rotating shaft is supported via a pusher engaged with a frame, and the rotating scroll member is engaged with an eccentric portion of a rotating shaft, and the rotating shaft is supported via a pusher engaged with a frame, and A scroll compressor characterized by using a sliding bearing made of jointly sintered bimetal impregnated with graphite and resin. (2) The scroll compressor according to claim (1), wherein the resin is a thermoplastic resin having a heat resistance of 250° C. or higher, such as polyimide. (3) The scroll compressor according to claim (1), wherein the push has a cut surface.