JP2000009072A - Rotary compressor that has multiple compression chambers and can perform multi-stage compression - Google Patents

Abstract

(57) [PROBLEMS] Rotation capable of reducing compression ratio by performing multi-stage compression through a plurality of compression chambers, thereby reducing refrigerant leakage and increasing not only compression rate but also vibration and noise. Provide a compressor. SOLUTION: A first compressor which receives a refrigerant from the outside and performs primary compression.
The first cylinder forming the compression chamber, the second cylinder forming the second compression chamber for receiving and compressing the refrigerant compressed in the first compression chamber and performing the second compression, and the eccentric portion 17 of the rotating shaft are respectively coupled to each compression. It includes a first roller 27a and a second roller 27b that eccentrically rotate in a room to compress the refrigerant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rotary compressor,
More particularly, the present invention relates to a rotary compressor and a method of compressing the refrigerant, the compression ratio being reduced by performing multi-stage compression through a plurality of compression chambers, thereby reducing refrigerant leakage, vibration, and noise generated during compression.

[0002]

2. Description of the Related Art FIG. 9 is a vertical sectional view of a conventional hermetic rotary compressor, and FIG. 10 is a side sectional view of a compression section shown in FIG. As shown in these figures, a conventional rotary compressor includes a cylindrical casing 101 forming an enclosed space, and a casing 1.
The compressor includes a compression unit 105 that is received in the compressor 01 and compresses the refrigerant, and a drive motor 103 that drives the compression unit 105. An accumulator 106 is provided outside the casing 101, and supplies a gaseous refrigerant to the compression unit 105 through a refrigerant supply pipe 108.

In the upper region of the casing 101, a compression unit 1 is provided.
A refrigerant discharge pipe 107 for discharging the refrigerant compressed in 05 to the outside of the casing 101 is provided, and an oil supplied for lubrication and cooling of driving components in the casing 101 is received in a bottom region. Oil receiving part 109
Are formed.

The compression section 105 includes a cylindrical cylinder 123 forming a compression space, and a roller 125 that rolls while contacting the inner wall surface of the cylinder 123. An upper flange 131 that blocks an open area so as to form a compression space for compressing a refrigerant at upper and lower ends where the cylinder 123 is opened;
Lower flanges 133 are provided, respectively. An upper muffler 135 is provided above the upper flange 131 to temporarily receive the refrigerant compressed by the cylinder 124 and discharge the refrigerant upward. On the other hand, a refrigerant inlet 139 through which the refrigerant flows and a refrigerant discharge port 141 through which the refrigerant is discharged are formed on the inner wall surface of the cylinder.

The drive motor 103 includes a stator 111 provided on the inner wall surface of the casing 101, and a cylindrical rotor inserted into a region surrounded by the stator 111 and rotated when power is applied to the drive motor 103. 113. A rotation shaft 115 is inserted in the central region of the rotor 113 so as to be rotatable together with the rotor 113.

The rotary shaft 115 extends downward past the compression section 105 to the oil receiving section 109, and
Is connected to the inside of the roller 125 and is in contact with the inner wall surface of the cylinder 123.
An eccentric portion 117 is formed so as to be eccentric so as to be able to roll. An oil pickup vane 119 is provided at the lower end of the rotating shaft 115 immersed in the oil receiving portion 109 so as to rotate the oil in the oil receiving portion 109 upward by rotating together with the rotating shaft 115 to supply the oil to the driving components in the casing 101. Have been.

With the above configuration, when the rotating shaft 115 rotates, the refrigerant supply pipe 108 communicated with the refrigerant inlet 139.
The refrigerant in a gaseous state is sucked into the cylinder 123 from the accumulator 106 through the airbag. The sucked refrigerant is compressed by rollers 125 rolling in the cylinder 123, and the compressed refrigerant is discharged through the refrigerant discharge port 141. The refrigerant discharged from the compression unit 105 is supplied to the muffler 135
After being temporarily received by the casing 1
The refrigerant is discharged to the outside of the casing 101 through a refrigerant discharge port 107 provided in an upper region of the casing 101.

However, in this conventional rotary compressor, the compression ratio (= the pressure of the discharged refrigerant / the pressure of the supplied refrigerant) is increased by compressing the sucked refrigerant to a desired pressure at a time, so that the inside of the casing is increased. Since a large amount of refrigerant leaks into the gap between the driven components, not only the compression ratio is reduced but also the reliability of the driven components is reduced due to the increase in vibration and noise.

[0009]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a multi-stage compressor through a plurality of compression chambers in consideration of the above-mentioned problems. It is an object of the present invention to provide a rotary compressor which can reduce not only the compression ratio but also the vibration and the noise.

[0010]

According to the present invention, there is provided a rotary compressor having a rotary motor having first and second eccentric portions; A first cylinder forming a first compression chamber for compression;
A second cylinder that forms a second compression chamber that receives and compresses the refrigerant compressed in the first compression chamber and performs a second compression; and a second cylinder that is coupled to the eccentric portion of the rotating shaft and eccentrically rotates in each of the compression chambers. It is characterized by including first and second rollers for compressing the refrigerant.

Preferably, an upper muffler is provided for temporarily receiving the refrigerant discharged from the second cylinder. The first compression chamber and the second compression chamber are formed such that the inside of a single cylinder is separated by a partition. According to one embodiment of the present invention, a coolant inlet and a coolant outlet are formed on inner walls of the first cylinder and the second cylinder, respectively.
On one side of the inner wall of the first cylinder and the second cylinder, there is formed a refrigerant connection flow path that communicates a refrigerant discharge port of the first cylinder and a refrigerant inlet of the second cylinder.

A check valve is provided on the inner wall of the refrigerant connection passage to prevent the refrigerant from flowing backward from the first compression chamber toward the second compression chamber. Here, it is effective that the check valve is a reed valve that elastically closes the refrigerant connection flow path. Meanwhile, according to another embodiment of the present invention, the rotary compressor further includes a lower muffler for temporarily receiving the refrigerant primarily compressed in the first compression chamber. It is effective that the lower muffler is formed at a lower side of the rotating shaft and at least partially immersed in an oil receiving portion for receiving oil.

The lower muffler has a refrigerant inlet and a refrigerant outlet, the second cylinder has a refrigerant inlet, and one side of the inner wall of the first and second cylinders. A refrigerant connection flow path that connects the refrigerant inlet of the cylinder and the refrigerant outlet of the lower muffler is formed. Further, the first roller and the second roller maintain a phase difference of 180 ° with respect to the axis of the rotation shaft.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a cross-sectional view of a rotary compressor according to a first embodiment of the present invention, FIG. 2 is a side cross-sectional view of a compression unit of FIG. 1, and FIGS. 3 and 4 respectively show an upper cylinder and a lower cylinder of FIG. FIG. As shown in this figure, the rotary compressor according to the present invention is different from a conventional rotary compressor in that a cylindrical casing 1 is provided.
, A driving motor 3 for generating a driving force, and a driving motor 3
And a compression section 5 separated by a partition plate 25 capable of compressing the refrigerant by the driving force of the compressor. An accumulator 6 is provided outside the casing 1 and supplies a gaseous refrigerant to the compression unit 5 through a refrigerant supply pipe 8.

A refrigerant discharge pipe 7 through which the refrigerant compressed by the compression section 5 is discharged is formed in an upper region of the casing 1, and is supplied to a bottom region for lubrication and cooling of drive components in the casing 1. An oil receiving portion 9 for receiving the oil to be formed is formed. The drive motor 3 includes a stator 11 provided on the inner wall surface of the casing 1 and a cylindrical rotor 13 which is inserted into a region surrounded by the stator 11 and rotates when power is applied to the drive motor 3. Including. A rotation shaft 15 is provided in a central region of the rotor 13 so as to be rotatable together with the rotor 13.
Is inserted.

The rotary shaft 15 extends downward to an oil receiving portion 109, and an eccentric portion 17 is formed in a lower region. Rotary shaft 15 immersed in oil receiving portion 9
An oil pickup vane 19 is provided at the lower end of the oil pickup vane 19 to rapidly and upwardly feed the oil in the oil receiving portion 9 by rotation.

On the other hand, a compression section 5 is provided in a lower area of the drive motor 3. The compression unit 5 includes a lower cylinder 21 that primarily compresses the refrigerant that has flowed into the casing 1 from the accumulator 6, an upper cylinder 23 that receives the refrigerant compressed by the lower cylinder 21 and performs a second compression, and an upper cylinder 2.
A partition plate 25 interposed between the lower cylinder 3 and the lower cylinder 21 to separate the compression space; rollers 27a and 27b that roll while contacting the inner wall surfaces of the cylinders 21 and 23;
Rollers 2 protruding from the inner wall surfaces of
The cylinders 21 and 27 contact the outer peripheral surfaces of the cylinders 21 and 27b.
Vane 29 that divides the interior of 3 into a compression space and an inflow space
a, 29b.

Above the upper cylinder 23, there is provided an upper flange 31 for blocking an open area so that a compression space for compressing the refrigerant is formed in the upper cylinder 23, and a lower flange 33 below the lower cylinder 21. Is provided. The upper part of the upper flange 31 temporarily receives the refrigerant discharged through the upper cylinder 23 and receives the casing 1.
An upper muffler 35 for discharging upward is provided inside.

Refrigerant inlets 37a, 37b through which the refrigerant flows are formed on the inner wall surfaces of the upper cylinder 23 and the lower cylinder 21, and refrigerant outlets 39a, 39b are provided adjacent to the refrigerant inlets 37a, 37b. Is formed. Further, the inside of the side wall of the upper cylinder 23 and the partition wall 25 are formed such that the refrigerant compressed and discharged from the refrigerant discharge port 39a of the lower cylinder 21 flows in through the refrigerant inlet 37b of the upper cylinder 23 and is secondarily compressed. And lower cylinder 2
The lower cylinder 21 and the upper cylinder 2
1 are formed so as to communicate with each other. Also, the refrigerant discharge port 39a of the lower cylinder 21
Is provided with a backflow prevention valve 43 which can prevent the backflow of the refrigerant discharged from the lower cylinder.

When the rotary shaft 15 rotates, the refrigerant in the gaseous state flows from the accumulator 6 through the refrigerant supply pipe 8 connected to the refrigerant inflow port 37a. Through the lower cylinder 21. The refrigerant flowing into the lower cylinder 21 is coupled to the outside of the eccentric portion 17 of the rotating shaft 15 and is compressed by the rollers 27a that roll while contacting the inner wall surface of the lower cylinder 21 and discharged to the refrigerant discharge port 39a.

The discharged refrigerant flows upward along the refrigerant connection flow path 41, and flows into the refrigerant inlet 37b of the upper cylinder 23.
Through the upper cylinder 23. The refrigerant flowing into the upper cylinder 23 is compressed by the rollers 27b rolling while contacting along the inner wall surface of the upper cylinder 23 and discharged through the refrigerant discharge port 39b, and the discharged refrigerant is discharged from the upper muffler provided on the upper flange 31. After being received a little by 35, it is discharged upward into the casing 1 and discharged outside the casing 1 through the refrigerant discharge pipe 7.

FIG. 5 is a longitudinal sectional view of a rotary compressor according to a second embodiment of the present invention, FIG. 5 is a side sectional view of a compression section of FIG. 4, and FIGS. It is a plane sectional view of a cylinder and a lower cylinder. However, the same portions as those of the first embodiment of the present invention are denoted by the same reference numerals, and the repeated description is omitted. The rotary compressor according to the second embodiment includes:
As shown in the drawing, after the refrigerant discharged from the lower cylinder 21 is temporarily received and cooled by the oil received in the oil receiving portion 9, the lower muffler 40 which flows out to the upper cylinder 23 has a lower flange 33. It is provided below.

On the other hand, the upper cylinder 23 and the lower cylinder 2
1 has refrigerant inlets 37a, 37b into which the refrigerant flows, and refrigerant outlets 39a, 39b adjacent to the refrigerant inlets. The upper flange 31 and the lower flange 33 have refrigerant discharge passages 43a, 43b, which communicate with the refrigerant discharge ports 39a, 39b of the upper cylinder 23 and the lower cylinder 21, respectively.
3b are formed respectively.

The refrigerant is first compressed in the lower cylinder 21 and is discharged through the refrigerant discharge port 39a.
The refrigerant discharged through 3a is discharged to the lower muffler 40, and the refrigerant received by the lower muffler 40 flows into the refrigerant inlet 37b of the upper cylinder 23 and is secondarily compressed so that the lower flange 33 and the upper cylinder 23 are compressed. And partition 2
5 and the lower cylinder 21 are formed with a refrigerant connection channel 41 which is communicated with each other.

The rollers 27a and 27b received in the upper cylinder 23 and the lower cylinder 21 are connected to the outer peripheral surface of the eccentric portion 17 of the rotating shaft 15, and the eccentric portion 17 is aligned with the axis of the rotating shaft 15. The rollers 27a and 27b are formed so as to face each other and
It rolls while maintaining a phase difference of 0 °.

When the rotary shaft 15 rotates, the refrigerant in a gaseous state is supplied from the accumulator 6 to the refrigerant supply pipe 8 communicating with the refrigerant inlet 37a of the lower cylinder 21.
Through the lower cylinder 21. The inflowing refrigerant is compressed by rolling while the roller 27a is in contact with the inner wall surface of the lower cylinder 21, and the refrigerant is discharged from the refrigerant outlet 39a.
Is discharged to the lower muffler 40 through the refrigerant discharge passage 43a. Since the lower muffler 40 is immersed in the oil receiving portion 9, the primary refrigerant temporarily received by the lower muffler 40 is cooled by the oil in the oil receiving portion 9 and its bulk is reduced.

The cooled refrigerant flows along the refrigerant connection passage 41 and flows into the upper cylinder 23 through the refrigerant inlet 37b of the upper cylinder 23. At this time, since the phase difference between the roller 27b in the upper cylinder 23 and the roller 27a in the lower cylinder 21 is maintained at 180 °, the backflow of the refrigerant is prevented.

The refrigerant flowing into the upper cylinder 23 rolls while contacting the inner wall surface of the upper cylinder 23.
b through the refrigerant discharge port 39b of the upper cylinder 23 and the refrigerant discharge passage 43b.
After being temporarily received in 5, it is drained upward. The outflow refrigerant moves upward to the casing 1 and is discharged to the outside of the casing 1 through a refrigerant discharge pipe 7 provided in an upper region.

As described above, by compressing the refrigerant through the upper cylinder 23 and the lower cylinder 21 in two stages, the compression ratio (the pressure of the refrigerant discharged / the pressure of the refrigerant flowing into the refrigerant) is higher than that of the conventional rotary compressor. ) Reduces the amount of refrigerant leaking into the gap between the drive components, increases the compression ratio, and reduces vibration and noise. Furthermore, since the primary compressed refrigerant is temporarily received by the lower muffler immersed in the oil receiving portion, it is cooled and its volume is reduced. The pulsation generated when is supplied to the upper cylinder 23 is reduced.

[0030]

As described above, according to the present invention, by performing multi-stage compression through a plurality of compression chambers, the compression ratio is reduced, thereby reducing refrigerant leakage, vibration and noise generated during compression. A possible rotary compressor is provided. Although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the above-described specific preferred embodiments, and is generally applicable to the technical field to which the present invention pertains without departing from the spirit of the present invention. Of course, anyone having the knowledge of the above can make various modifications, and such changes fall within the scope of the claims.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of a compression unit of FIG.

FIG. 3 is a plan sectional view of the upper cylinder of FIG. 1;

FIG. 4 is a plan sectional view of the lower cylinder of FIG. 1;

FIG. 5 is a sectional view of a rotary compressor according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of the compression unit of FIG.

FIG. 7 is a plan sectional view of the upper cylinder of FIG. 4;

FIG. 8 is a plan sectional view of the lower cylinder of FIG. 4;

FIG. 9 is a sectional view of a conventional rotary compressor.

FIG. 10 is a cross-sectional view of the compression unit of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 3 Drive motor 5 Compressor 6 Accumulator 7 Refrigerant discharge pipe 9 Oil receiving part 15 Rotating shaft 17 Eccentric part 21 Lower cylinder 23 Upper cylinder 25 Separator 27a, 27b Roller 29a, 29b Vane 31 Upper flange 33 Lower flange 35 Upper muffler 40 lower muffler 37a, 37b refrigerant inlet 39a, 39b refrigerant outlet 41 refrigerant connection channel 43 check valve

Claims (10)

[Claims] 1. A rotary compressor, comprising: a drive motor having a rotary shaft having first and second eccentric portions; a first cylinder forming a first compression chamber that receives a refrigerant from the outside and performs primary compression; A second cylinder forming a second compression chamber for receiving and compressing the refrigerant compressed in the first compression chamber to perform a second compression; and a second cylinder coupled to the eccentric portion of the rotating shaft to rotate eccentrically in each of the compression chambers to generate the refrigerant. A rotary compressor comprising first and second rollers for compressing. 2. The rotary compressor according to claim 1, wherein the first compression chamber and the second compression chamber are formed by partitioning a single cylinder by a partition. 3. The rotary compressor according to claim 1, further comprising an upper muffler for temporarily receiving the refrigerant discharged from the second cylinder. 4. A refrigerant inflow port and a refrigerant discharge port are formed in inner walls of the first cylinder and the second cylinder, respectively, and one side of the inner wall of the first cylinder and the second cylinder is formed on one side of the inner wall. The rotary compressor according to any one of claims 1 to 3, wherein a refrigerant connection flow path that connects a refrigerant discharge port of the first cylinder and a refrigerant inlet of the second cylinder is formed. 5. The valve according to claim 4, wherein an inner wall of the refrigerant connection flow path is provided with a check valve for preventing a back flow of the refrigerant from the first compression chamber to the second compression chamber. The rotary compressor as described. 6. The rotary compressor according to claim 5, wherein the check valve is a reed valve that elastically closes the refrigerant connection flow path. 7. The rotary compressor according to claim 1, further comprising a lower muffler for temporarily receiving the refrigerant primarily compressed in the first compression chamber. 8. The oil pump according to claim 7, further comprising an oil receiving portion formed below the rotating shaft to receive oil, wherein the lower muffler is at least partially immersed in the oil receiving portion. A rotary compressor according to item 1. 9. A refrigerant inlet and a refrigerant outlet are formed in the lower muffler, a refrigerant inlet is formed in the second cylinder, and one side of the first and second cylinders is provided with a refrigerant inlet. 9. The rotary compressor according to claim 8, wherein a refrigerant connection flow path that connects a refrigerant inlet and a refrigerant outlet of the lower muffler is formed. 10. 10. The method according to claim 7, wherein the first roller and the second roller maintain a phase difference of 180 ° with respect to the axis of the rotation shaft. Rotary compressor.