JP2609176B2 - 2-cylinder rotary compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-cylinder rotary compressor mainly used for refrigeration or air conditioners.
In particular, it is intended to reduce the pressure loss in the refrigerant suction passage.

[0002]

2. Description of the Related Art FIGS. 2 and 3 show a conventional two-cylinder rotary compressor disclosed in Japanese Utility Model Laid-Open Publication No. 50793/1981, where 1 is a drive shaft having eccentric portions 1a and 1b, 2a,
2b is a cylinder having compression chambers 3a and 3b formed therein, 4a and 4b are rolling pistons driven by eccentric parts 1a and 1b, 5a and 5b are vanes for constantly pressing the outer peripheral surfaces of these rolling pistons, 6a and 6b. Are springs for pressing the vanes 5a and 5b, 7 and 8 are bearing plates forming compression chambers inside, and 9 is interposed between the cylinders 2a and 2b, and the compression chambers 3a and 3b are separated on both sides thereof. The intermediate partition plate 10 is a hermetic casing for housing the two compression elements A and B, 13 is a suction pipe for low-pressure refrigerant gas,
The suction passages 14, 1 whose leading ends are provided in the intermediate partition plate 9
It is connected to 5.

When the drive shaft 1 rotates in the above configuration,
Due to this, the rolling pistons 4a, 4b roll along the inner peripheral surfaces of the cylinders 2a, 2b, and the low-pressure refrigerant gas is supplied to the suction pipe 13 and the suction passages 14, 1 as indicated by arrows in FIG.
The refrigerant gas is sucked into the low-pressure chambers of the compression chambers 3a and 3b through the passage 5, and compressed to become a high-temperature and high-pressure refrigerant gas, which is sent out from a discharge pipe.

[0004]

As described above, since the refrigerant gas suction passage in the conventional example is provided in the intermediate partition plate 9, a complicated processing step is required. In order to avoid this, it is necessary to increase the inner diameter of the suction passage by increasing the thickness of the intermediate partition used. In this case, the bearings 7 and 8 of the drive shaft 1 are required. There is a disadvantage that the distance between the bearings increases, and the bearings are unbalanced due to shaft deflection, thereby lowering the reliability of the bearing and the drive shaft. In addition, when the suction gas is sucked during the compression process, pulsation occurs in the suction passage, so that the suction efficiency can be improved by optimizing the length of the suction passage. 180 for process
° phase shift, and the first and second suction passages 1
Since the suction pipes 4 and 15 are directly connected to the suction pipes, the suction passage lengths cannot be set independently and optimally, and the suction efficiency cannot be increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is possible to independently set each suction pipe to an optimum length, and to make the suction refrigerant gas interfere with each other in the accumulator. And to improve the efficiency of the compressor.

[0006]

A two-cylinder rotary compressor according to the present invention is divided by an intermediate partition plate and has a phase shift in a suction process at both ends thereof forming first and second compression chambers. A low-pressure refrigerant gas suction passage was formed in the cylinder in parallel with the intermediate partition plate, and was communicated via a common accumulator to a refrigerant gas common suction pipe located outside the hermetically sealed housing for accommodating them. The tip of the first and second suction pipes is
In the two-cylinder rotary compressor inserted into each of the corresponding suction passages through the hermetically sealed casing, the first and second partition plates prevent the mutual interaction of the suction refrigerant gas in the accumulator. The suction pipes are divided so as to be individually accommodated, and a gap is provided in a lower portion of the partition plate so that both lower ends of the partition plate communicate with each other to make the liquid level of the accumulator uniform.

[0007]

In the two-cylinder rotary compressor according to the present invention, each suction pipe is independently set to an optimum length, thereby preventing the mutual influence of the suction refrigerant gas in the accumulator. In addition, since the liquid is communicated with the lower part of the partition plate, the liquid level in the accumulator is made uniform, and the characteristics of the space on both sides which are partitioned become the same, so that the characteristics of the gas become the same, and unbalanced force is not generated. An efficient two-cylinder compressor can be configured.

[0008]

[Embodiment 1] FIG. 1 is a sectional view of an essential part showing one embodiment of the present invention, and the same portions as those of the conventional example are denoted by the same reference numerals. In the present invention, a first suction passage for guiding a refrigerant gas to a compression element A is shown. 1
4A and a second suction passage 15B for guiding the refrigerant gas to the compression element B are formed in each of the cylinders 2a and 2b substantially in parallel with the intermediate partition plate 9 interposed between the cylinders 2a and 2b. The other ends of the first suction pipe 13a and the second suction pipe 13b, each of which has a distal end inserted therein, extend through the closed casing 10 to the outside thereof and have a common function of gas-liquid separation. The accumulator 17 is connected to the common suction pipe 16 via the accumulator 17.
The inside is divided into two chambers by a partition plate 18, and the first and second suction pipes 13a and 13b are housed in the respective chambers in an isolated state.

Therefore, in the two-cylinder rotary compressor of the present invention having the above structure, the low-pressure refrigerant gas passes through the common suction pipe 16 and
After gas-liquid separation in the accumulator 17, one reaches the compression chamber 3a via the suction pipe 13a and the suction passage 14A, and the other is sucked into the compression chamber 3b via the suction pipe 13b and the suction passage 15B. At this time, the suction passages 14A,
Since 15B is bored in each of the cylinders 2a and 2b, its processing is easy, and its inner diameter can be designed to be sufficiently large regardless of the thickness of the intermediate partition plate 9.
The axis of each of the suction pipes 13a and 13b and the axis of the suction passages 14A and 15B are formed so as to be located on the same axis, and the compression chambers 3a and 3b are kept as they are.
, The pressure loss in the flow path is extremely small. Further, since each suction pipe 13a, 13b is connected to the common suction pipe 16 via the accumulator 17, each suction pipe 13a, 13b and the suction passage 14A, 1
The low-pressure refrigerant gas passage by 4B is separated by the accumulator 17, the length of each passage can be independently set to an optimum length, and the suction efficiency can be increased.

The inside of the accumulator 17 is divided into two chambers by a partition plate 18, and the first and second suction pipes 13a and 13b are housed in each chamber in an isolated state. As a result, the suction pipe 13a , 13b at the open ends in the accumulator 17 are prevented from interfering with each other, and the suction efficiency of the compressor is further improved. At this time, a communication gap 18a is provided at the bottom of the partition plate 18, and the accumulator 1
When the liquefied refrigerant is stored in the chamber 7, the liquid level in the two chambers separated by the partition plate is prevented from becoming uneven.

[0011]

As described above, according to the present invention, each of the cylinders which are partitioned by the intermediate partition plate and which have a phase shift in the suction process at both ends forming the first and second compression chambers is provided to the intermediate partition. A first suction passage for a low-pressure refrigerant gas is formed in parallel with the plate, and a first suction passage is provided through a common accumulator to a common suction pipe for the refrigerant gas located outside the hermetic housing for accommodating the low-pressure refrigerant gas.
And the tip of the second suction pipe is inserted into each of the corresponding suction passages through the hermetic casing, and the first and second suction pipes are individually housed in the accumulator by a partition plate. The suction pipes can be set independently of each other, the mutual interference of the suction refrigerant gas in the accumulator is prevented, and the lower part of the partition plate is communicated with the accumulator. The characteristics of the space on both sides are uniform because the liquid level is uniform and the characteristics of the gas on both sides are the same, so that unbalanced force according to the fluctuation of gas is not generated and the efficiency of the compressor is improved. Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a two-cylinder rotary compressor according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a main part of a conventional two-cylinder rotary compressor.

FIG. 3 is a cross-sectional view of a conventional two-cylinder rotary compressor.

[Explanation of symbols]

 2a cylinder 2b cylinder 3a compression chamber 3b compression chamber 9 intermediate partition plate 10 sealed jacket 13a suction pipe 13b suction pipe 14a suction passage 15b suction passage 16 common suction pipe 17 accumulator 18 partition plate 18a gap

Continued on the front page (72) Inventor: Osamu Ueda 3-18-1, Oka, Shizuoka-shi Mitsubishi Electric Corporation Shizuoka Works (72) Inventor: Kazuhiro Nakane 3-181-1, Oka, Shizuoka-shi, Shizuoka Mitsubishi Electric Corporation Shizuoka Works (56) References JP-A-59-105992 (JP, A) JP-A-58-1783 (JP, U) JP-A-55-126173 (JP, U)

Claims (1)

(57) [Claims] An intake passage for a low-pressure refrigerant gas parallel to said intermediate partition plate is provided in each cylinder which is partitioned by an intermediate partition plate and has a phase shift in a suction process at both ends thereof forming first and second compression chambers. And the ends of the first and second suction pipes, which are communicated via a common accumulator, to a common suction pipe for the refrigerant gas located outside the sealed casing for accommodating them, respectively, In the two-cylinder rotary compressor inserted into each of the corresponding suction passages through the cover, the first and second suction pipes are separated by a partition plate that prevents mutual action of the suctioned refrigerant gas in the accumulator. A two-cylinder rotary compressor, wherein the two-cylinder rotary compressor is divided so as to be individually accommodated, and a gap is provided below the partition plate to communicate both ends of the lower portion of the partition plate to make the liquid level of the accumulator uniform.