JPS6143292A - rotary compressor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotary compressor used in room air conditioners, refrigerators, and the like.

[Prior art]

BACKGROUND ART In recent years, rotary type compressors have been widely used in room air conditioners, refrigerators, etc. and constitute cold sources, due to the demand for lighter weight and smaller size.

For example, FIG. 1 is a sectional view of a conventional rotary compressor disclosed in Japanese Utility Model Application Publication No. 58-30790. , a side plate 3.4 that closes both ends of the cylinder 2 to form a compression chamber, and a rolling piston 5 loaded into the compression chamber. The piston 5 is mounted on a rotating shaft 6 that is supported by the bearings of the side plates 3 and 4. When the rotating shaft 6 is rotationally driven by the stake 7 and the rotor 8, it slides on the inner surface of the cylinder 2. Rotate eccentrically so that they touch each other.

Then, gas is sucked in and compressed by the action of a not-shown Hoehne that divides the compression chamber into two chambers.

The compressed gas is introduced into the muffler 10 from the discharge hole 9 provided in the side plate 3, passes through the gap between the muffler 10 and the side plate 3, is reduced in sound, and is sent into the airtight container 1. Ru.

By the way, in a high-efficiency compressor with such a structure and a high compression ratio, the temperature of the discharged gas compressed by the compression element becomes high, which heats the motor element and affects the reliability of the compressor. It turns out. For this reason, conventionally, the second
As shown in the figure, by providing a discharge hole 9 in the side plate 4 that pivotally supports the tip of the rotating shaft 6, the discharge gas flow path is separated from the motor element to reduce the influence of heat.

However, in conventional rotary compressors of this type,
There was a problem that noise reduction was not necessarily achieved. This means that when the discharge gas is discharged from the discharge hole 9,
This is because pressure pulsations occur due to vibrations of the discharge valve 11, and this pressure pulsation causes a force in the thrust direction indicated by F in the figure to act on the end surface of the rotating shaft 6. As a result, the balance between the forces acting on the rotating shaft 6 and the thrust surface 12 on the end surface of the side plate 4 becomes unstable, and the rotating shaft 6 becomes separated from the side plate 4, causing abnormal noise. ing. In order to reduce the pressure pulsations, the volume of the muffler 10 may be increased, but this will result in an increase in the size of the rotary compressor.

[Summary of the invention]

The present invention has been made in view of the above circumstances, and includes providing a discharge hole in a side plate that pivotally supports the tip of a rotary shaft that rotates a piston, and covering the outside of this side plate with a covering that forms a silencing chamber. At the same time, an extremely simple configuration in which a plate is provided that defines the discharge hole and the muffling chamber to form a discharge gas passage, and a passage outlet is provided at a position away from the discharge hole of the discharge gas passage, reduces noise. The present invention provides a rotary compressor that can reduce the amount of heat generated. below,
The configuration and the like will be explained in detail with reference to embodiments shown in the drawings.

[Embodiments of the invention]

FIG. 3 shows the main parts of the rotary compressor according to the present invention (a)
In front view and (b) longitudinal section, in these figures 2
6 is a cylinder whose one end is closed by a side plate 4 and the other end is closed by a side plate (not shown), and 6 is a rotary shaft which rotates a piston 5 loaded into the cylinder 2, the tip of which is supported by the side plate 4. 9 is the cylinder 2
A discharge hole 10 is formed in the side plate 4 corresponding to the compression chamber 2a in the side plate 4, and a noise muffler is provided as a covering body that covers the outside of the site plate 4 to form a noise reduction chamber. , 11 are discharge valves for opening and closing the discharge hole 9, and these members are no different from conventional ones.

15 is a plate that defines the discharge hole 9 and the silencing chamber;
In this embodiment, the plate 15 has a central hole and is formed into a disk shape that is in close contact with the surface of the side plate 4. A portion along the circumferential direction from the portion corresponding to the discharge hole 9 is recessed to have a rectangular cross section.
A discharge gas passage 16 having an arcuate shape is formed between the side plate 4 and the side plate 4 .

Reference numeral 17 denotes a through hole serving as a passage outlet provided at a position away from the discharge hole 9 of the discharge gas passage 16. In this embodiment, one through hole 17 extends from the discharge hole around the axis of the rotating shaft 6. It is drilled at a position symmetrical to 9. Further, although not shown, the plate 15 and the muffler 10 are integrated by brazing or the like in order to improve the airtightness between these two members. For this reason, plate 15
This prevents the compressed gas sent out from the through holes 17 from leaking through the gap between the muffler 10 and the plate 15 and reducing the muffling effect, and also improves ease of assembly.

In the rotary compressor configured in this way, the compressed gas periodically discharged from the discharge hole 9 by the rotation of the piston 5 is first introduced into the discharge gas passage 16, and after passing through the discharge gas passage 16. , is sent out from the through hole 17 into the silencing chamber formed by the silencing muffler 10. Therefore, in the compressed gas, the jet flow containing the vortex generated by the discharge valve 11 and the like is rectified in the discharge gas passage 16, and the pressure pulsation is alleviated.

Therefore, pressure pulsations do not directly act on the end face of the rotating shaft 6 as in the conventional case, and the force acting on this end face can be reduced.

As a result, the balance of forces acting on the rotating shaft 6 and the thrust surface 12 of the end surface of the side plate 4 does not become unstable, and the rotating shaft 6 can be prevented from coming loose from the side plate 4. Furthermore, since the muffler 10 can also cover the end face of the rotating shaft 6, the muffler 10, which has a relatively large volume and has a high noise reduction effect, can be disposed within a limited space.

Note that the discharge gas passage 16 is not limited to an arcuate shape, but can also be formed in a circular annular shape as shown in FIG.

FIG. 5 shows (a) a front view and (a) a front view showing the main parts of another embodiment;
b) Longitudinal sectional views. In these figures, members that are the same or equivalent to those shown in FIG. 3 are given the same reference numerals, and their explanations will be omitted. In this embodiment, a dish-shaped plate 20 having a central hole is used, and a discharge gas passage 21 having a triangular cross section is formed between the boss portion 4a of the side plate 4 and the plate 20. In this way,
Compressed gas can be rectified in the discharge gas passage 21, and the plate 20 can be made into a simple shape, so processing costs can be reduced.

6 to 8 are front views of main parts similarly showing other embodiments. In the embodiment shown in FIG. 6, a portion of the central hole of the plate 20 is formed to have a larger diameter than the boss portion 4a. has been
A gap 22 between the plate 20 and the boss portion 4a of the side plate 4 forms a passage outlet of the discharged gas passage 21. This eliminates the need for special machining to provide a passage outlet, and the shape of the plate 20 can be simplified.

In the embodiment shown in FIG. 7, the passage outlet of the discharged gas passage 21 is formed by a recessed part 23 provided in the boss part 4a of the side plate 4. In the embodiment shown in FIG. .

In the embodiment shown in FIG. 8, a plurality of relatively small diameter through holes 24, 24, . . . are provided as passage outlets of the discharged gas passage 21. In this way, the compressed gas is dispersed and sent into the silencing chamber, and the excitation points of the silencing muffler 10 can be dispersed to reduce the individual excitation forces, thereby preventing resonance of the silencing muffler 10. I can do it.

Also in the rotary compressor configured in this way, compressed gas is passed through the discharge gas passage 21 as in the embodiment shown in FIG.
It can be rectified by

〔Effect of the invention〕

As explained above, according to the present invention, a discharge hole is provided in a side plate that pivotally supports the tip of a rotating shaft, and the outside of this side plate is covered with a covering that forms a silencing chamber, and the discharge hole is Since the plate that defines the silencing chamber and forms the discharge gas passage is provided on the side plate, and the passage outlet is provided at a position away from the discharge hole, the compressed gas discharged from the discharge hole is rectified in the discharge gas passage. and can alleviate pressure pulsations.

Therefore, the force acting on the end face of the rotating shaft is reduced, and the balance of forces acting on the rotating shaft and the end face of the side plate does not become unstable.

Therefore, the rotating shaft will not come loose from the side plate and will not cause abnormal noise.
This has the effect of reducing noise from the rotary compressor.

[Brief explanation of the drawing]

1 and 2 are a longitudinal cross-sectional view and a vertical cross-sectional view of a main part of a conventional rotary compressor, and FIG. 3 is a front view (a) and a front view ( b) longitudinal section;
Fig. 4 is a front view showing the main parts of another embodiment, Fig. 5 is a front view (a) and (b) longitudinal sectional view showing the main parts of another embodiment, and Figs. 6 to 8 are It is a front view showing the main part of another example similarly. 2...Cylinder, 4...Side plate, 6...
... Rotating shaft, 9 ... Discharge hole, 1° ... Silence muffler, 15 ... Plate, 16 ... Discharge gas passage, 17 ... Through hole, 20 ...・Plate, 21・
...Discharge gas passage.

Claims (5)

[Claims] (1) In a rotary compressor equipped with a rotating shaft that rotates a piston loaded in a cylinder, and a side plate that pivotally supports this rotating shaft and closes both ends of the cylinder, the tip of the rotating shaft is A discharge hole is provided in a side plate that is supported pivotably, and the outside of this side plate is covered with a covering that forms a silencing chamber, and a discharge gas passage is provided between the side plate and the side plate, defining the discharge hole and the silencing chamber. 1. A rotary compressor characterized in that a side plate is provided with a plate forming a discharge gas passage, and a passage outlet is provided at a position remote from a discharge hole of the discharge gas passage. (2) The rotary compressor according to claim 1, wherein the side plate has a boss portion, and the discharge gas passage is formed between the boss portion and the plate. (3) The rotary compressor according to claim 2, wherein the passage outlet of the discharge gas passage is formed by a gap between the boss portion of the side plate and the plate. (4) The rotary compressor according to claim 2, wherein the passage outlet of the discharge gas passage is formed by a concave portion provided in the boss portion of the side plate. (5) The rotary compressor according to any one of claims 1 to 4, wherein a plurality of passage outlets of the discharge gas passage are provided.