JP2792366B2 - Rotary compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is mainly used for refrigerators,
The present invention relates to a rotary compressor provided with a bypass passage for guiding gas discharged from a rear head to a front side in a laminated member of a cylinder.

[0002]

2. Description of the Related Art Conventionally, this kind of compressor has been disclosed in
5, a cylinder C having a cylinder chamber V, a front head F, and a rear head H are laminated in a casing D, and a drive shaft extending from a motor A is provided in the cylinder chamber V. Eccentric shaft E of S
And a roller R to be fitted therein is provided, and discharge ports P and Q are respectively opened in the front head F and the rear head H. The air is guided to the inside of the front muffler N via a bypass passage B penetrating through H, C, and F.

[0003] The discharge structure for guiding the gas discharged from the rear discharge port Q to the front side via the bypass passage B as described in this publication includes a front discharge port P and a rear side discharge port P as disclosed in this publication. Discharge port Q is provided to discharge from the upper and lower two places of cylinder chamber V, reduce pressure loss at the time of discharge, cope with increase in processing amount accompanying inverter, etc., and improve efficiency etc. Has been widely adopted.
Similarly, from the viewpoint of efficiency improvement, a so-called twin type, in which cylinders are arranged in two upper and lower stages and discharge is performed from each of the upper and lower cylinder chambers, is often used. Further, in rare cases, a discharge port is provided only on the rear side without providing a discharge port on the front side due to structural restrictions or the like.

[0004]

However, as described above, the bypass passage B is provided in the laminated member of the cylinder C, and the gas discharged from the rear side flows through the bypass passage B. The high temperature discharge gas flowing through the cylinder chamber causes the cylinder chamber V to be overheated and the gas in the middle of compression to be overheated, resulting in a compression loss and a problem that efficiency cannot be sufficiently increased.

In this case, the bypass passage B is connected to the cylinder chamber V
It is conceivable to reduce the thermal effect by providing the cylinder C as far away as possible, but in this case, the outer diameter of the cylinder C becomes large, and there is a problem that the whole compressor becomes large.

A main object of the present invention is to provide a rotary compressor capable of reducing overheating of a cylinder chamber by a high-temperature discharge gas flowing through a bypass passage, suppressing compression loss and increasing efficiency. It is in.

[0007]

Therefore, in order to achieve the main object, first, as shown in FIGS. 1 and 2, a cylinder 1 having a cylinder chamber 8, a front head 2 and a rear head 3 are laminated. In a rotary compressor provided with a bypass passage 4 for guiding a gas discharged from a discharge port provided in the rear head 3 to a front side inside the laminated member, a tubular heat insulating layer 5 is provided inside the bypass passage 4.
Was provided.

Secondly, in the above-mentioned first means, further,
In order to easily form the heat insulating layer 5, as shown in FIGS. 1 and 2, a resin pipe 50 is provided inside the bypass passage 4,
The heat insulating layer 5 is formed by the resin tube 50.

Third, in the first means,
As shown in FIG. 3, a pipe material 61 such as a copper pipe is provided on the outside, and a resin layer is provided on the inside, as shown in FIG. A double pipe 41 having 51 is formed, the double pipe 41 is interposed inside the bypass passage 4, and the heat insulating layer 5 is formed by the resin layer 51.

Fourth, in the above-mentioned first means,
As shown in FIG. 4, a pipe member 62 such as a copper pipe is provided inside so as not to give resistance to the discharge gas passing through the bypass passage 4 in spite of adopting the heat insulating structure by the heat insulating layer 5. A double pipe 42 having a resin layer 52 on the outside is formed, and the double pipe 42 is interposed in the bypass passage 4,
The heat insulating layer 5 is formed by the resin layer 52.

[0011]

With the first means, by providing the tubular heat insulating layer 5 inside the bypass passage 4, it is possible to prevent the heat of the high-temperature discharge gas flowing through the bypass passage 4 from being transmitted to the cylinder chamber 8. Thus, overheating of the gas during compression in the cylinder chamber 8 can be reduced, the compression loss can be reduced, and the efficiency can be sufficiently increased.

According to the second means, the heat insulating layer 5 can be formed only by interposing the resin pipe 50 inside the bypass passage 4, and the heat insulating layer 5 can be formed as compared with a case where the bypass passage 4 is directly coated with a resin layer. Can be easily formed.

According to the third means, the outside of the resin layer 51 in the double pipe 41 is covered with the pipe material 61 such as a copper pipe. By such means, it is possible to easily interpose the bypass passage 4.

By the above-described fourth means, the outer side of the double pipe 42 is the resin layer 52, the inner side is a pipe material such as a copper pipe, and the discharge gas flows in contact with the inner surface of the inner pipe material 62. Therefore, the resistance to the flow of the discharge gas can be reduced as compared with the case where the discharge gas contacts the resin layer.

[0015]

FIG. 1 shows a twin-type rotary compressor having two cylinders 1 each having a cylinder chamber 8, and a support bracket 90 is provided below a closed casing 9 inside. The front head 2 and the laminated member 100 including the first cylinder 11 having the first cylinder chamber 81, the middle blade 10, the second cylinder 12 having the second cylinder chamber 82, and the rear head 3 are disposed via the first head 11. The first eccentric shaft portion 71 of the drive shaft 70 extending from the upper motor 7 and the roller 73 fitted on the first eccentric shaft portion 71 are housed in the cylinder chamber 81, and the first eccentric shaft portion 71 is displaced by 180 degrees in the second cylinder chamber 82. A second eccentric shaft portion 72 and a roller 74 fitted to the second eccentric shaft portion 72 are provided therein.

As shown in FIG. 2, the rear head 3 has a discharge port 31 for discharging gas compressed in the second cylinder chamber 82.
And a plate valve 32 is provided in the opening of the discharge port 31.
And a cantilever type discharge valve 34 having a valve presser 33 for receiving the rear side thereof. Front head 2
On the side, a discharge port for discharging the gas compressed in the first cylinder chamber 81 is opened at the same position as the discharge port 31 shown in FIG. 2, and a similar discharge valve is provided. FIG.
The middle 84 is a blade that partitions the second cylinder chamber 82 into a low pressure side and a high pressure side.

As shown in FIG. 1, low-pressure gas is sucked into each of the cylinder chambers 81 and 82 through a pair of suction pipes 91 and 92 and suction passages 13 and 14, and the first cylinder chamber 81
The gas compressed in the front head 2 is opened from the discharge port provided in the front head 2 to the inside of the front muffler 20, and then is opened to the inside of the casing 9. The gas compressed in the second cylinder chamber 82 is discharged from the discharge port provided in the rear head 3. Rear muffler 3
0, and then pass through the bypass passage 4 that is formed through the inside of the laminated member 100 at a position displaced by about 180 degrees from the position of the blade 84 (see FIG. 2), and is guided into the front muffler 20. After that, it is opened inside the casing 9. 93 is a discharge pipe. Also, 90
0 is an oil reservoir, 70a is an oil supply passage.

In the above configuration, a tubular heat insulating layer 5 is provided inside the bypass passage 4. The heat insulating layer 5 may be formed by directly coating the inner surface of the bypass passage 4 with a material having a high heat insulating property such as resin, but in the case shown in FIGS. 1 and 2, the resin pipe 50 is formed. Then, the resin tube 50 is interposed in the bypass passage 4, and the heat insulating layer 5 is formed by the resin tube 50, thereby simplifying the configuration.

Further, in addition to forming the heat insulating layer 5 with a single resin tube 50, as shown in FIG.
May be formed by forming a double pipe 41 having a resin layer 51 inside, and interposing this double pipe 41 inside the bypass passage 4 to form the heat insulating layer 5 by the resin layer 51. In this case, since the inner resin layer 51 is covered with the outer pipe material 61, the strength is stronger than that of the resin pipe alone, and the press-fitting into the bypass passage 4 can be performed easily and reliably.

Further, as shown in FIG. 4, a double pipe 42 having a pipe material 62 such as a copper pipe on the inside and a resin layer 52 on the outside is formed. The heat insulating layer 5 may be formed by the resin layer 52. In this case, since the discharged gas flows in contact with the inner surface of the inner pipe member 62, the discharged gas contacts the resin layer. In this case, the resistance to the flow of the discharge gas can be reduced as compared with the case where the discharge gas flow is performed, and the efficiency can be further improved.

[0021]

As described above, according to the first aspect of the present invention, it is possible to suppress the heat of the high-temperature discharge gas flowing through the bypass passage 4 from being transmitted to the cylinder chamber 8, and to prevent the heat in the cylinder chamber 8 from being compressed. Overheating of the gas can be reduced, the compression loss can be reduced, and the efficiency can be sufficiently increased.

According to the second aspect of the present invention, the resin tube 50 is provided.
The heat insulation layer 5 can be formed only by interposing the inside of the bypass passage 4, and the heat insulation layer 5 can be formed easily as compared with a case where the bypass passage 4 is directly coated with a resin layer.

According to the third aspect of the present invention, the double pipe 41 is provided.
Since the outside of the resin layer 51 is covered with a pipe material 61 such as a copper pipe, the strength is stronger than that of a resin pipe alone, and the resin pipe 51 can be easily inserted into the bypass passage 4 by press-fitting or the like. .

According to the fourth aspect of the present invention, since the discharge gas flows in contact with the inner surface of the inner pipe member 62, the resistance to the flow of the discharge gas is reduced as compared with the case where the discharge gas contacts the resin layer. Can be reduced, and the efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a rotary compressor according to the present invention.

FIG. 2 is a bottom view of the rear head in the first embodiment.

FIG. 3 is a sectional view of a main part of the second embodiment.

FIG. 4 is a sectional view of a main part of the third embodiment.

FIG. 5 is a sectional view of a conventional rotary compressor.

[Explanation of symbols]

1; Cylinder, 11; First Cylinder, 12; Second Cylinder, 2; Front Head, 3; Rear Head, 4; Bypass Passage, 5; Heat Insulation Layer, 8; Cylinder Chamber, 81; First Cylinder Chamber, 82; Two cylinder chamber, 50; resin pipe, 41,
42; double pipe, 51, 52; resin layer, 61, 62; pipe material

Claims (4)

(57) [Claims] 1. A cylinder having a cylinder chamber (8), a front head (2) and a rear head (3) in a stacked configuration, and a bypass passage for guiding a gas discharged from a discharge port provided in the rear head (3) to a front side inside these laminated members. A rotary compressor provided with a cylindrical heat insulating layer provided inside the bypass passage. 2. The rotary compressor according to claim 1, wherein a resin tube is provided inside the bypass passage, and the heat insulating layer is formed by the resin tube. 3. A double pipe 41 having a pipe material 61 such as a copper pipe on the outside and a resin layer 51 on the inside is formed.
The rotary compressor according to claim 1, wherein a heat insulating layer (5) is formed by the resin layer (51) in the bypass passage (4). 4. A double pipe 42 having a pipe material 62 such as a copper pipe inside and a resin layer 52 outside is formed.
The rotary compressor according to claim 1, wherein a heat insulating layer (5) is formed by the resin layer (52) interposed in the bypass passage (4).