JP2011021502A - Compressor, air conditioner, and water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent damage to a sliding portion caused by liquid compression in a low-stage compression mechanism, and also to prevent a decrease in compression efficiency caused by leakage of a refrigerant in a high-stage compression mechanism. <P>SOLUTION: In this compressor 30 as a two-stage compression type compressor, the refrigerant compressed by the low-stage compression mechanism 5L is further compressed by the high-stage compression mechanism 5H. The low-stage compression mechanism 5L includes a low-stage roller 61a arranged inside of a low-stage compression chamber 6s, and a low-stage blade 61b push-pressed to the peripheral surface of the low-stage roller 61a and partitioning the low-stage compression chamber 6s into a high-pressure chamber 6sh and a low-pressure chamber 6sl. The high-stage compression mechanism 5H is provided with a high-stage roller 71a arranged inside a high-stage compression chamber 7s, and a high-stage blade 71b extending from the peripheral surface of the high-stage roller 71a and partitioning the high-stage compression chamber 7s into a high-pressure chamber 7sh and a low-pressure chamber 7sl. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a compressor used in home appliances and the like, and more particularly, to a two-stage compression compressor, and an air conditioner and a water heater using the compressor.

  As a conventional two-stage compression compressor, a compressor including a low-stage compression mechanism and a high-stage compression mechanism arranged in a casing is known (for example, see Patent Document 1). In this compressor, the low-pressure gas refrigerant can be sucked from the accumulator into the low-stage compression mechanism. Then, the intermediate-pressure gas refrigerant compressed in the low-stage compression chamber of the low-stage compression mechanism is discharged into the space in the casing, and the intermediate-pressure gas refrigerant discharged into this space is compressed into the high-stage compression It is configured to be sucked into the mechanism. Then, the high-pressure gas refrigerant compressed in the high-stage compression chamber of the high-stage compression mechanism is discharged to the outside of the casing.

  Moreover, as such a conventional compressor, both a low-stage compression mechanism and a high-stage compression mechanism employ a compressor using a piston in which a roller and a blade are integrated (see, for example, Patent Document 2) A compressor using a piston in which a roller and a blade are separately formed in both a low-stage compression mechanism and a high-stage compression mechanism (for example, see Patent Documents 3 to 5) is known.

Japanese Patent No. 4151120 JP 2000-87892 A Japanese Patent No. 4,146,781 JP 2001-73976 A JP 2007-113542 A

  By the way, in the conventional two-stage compression compressor, liquid refrigerant is sucked into the low-stage compression mechanism during wet operation, and the sliding portion is prevented from being damaged due to abnormally high pressure due to the liquid compression operation. From the viewpoint, in order to release the liquid refrigerant mixed in the gas refrigerant sucked into the low-pressure chamber of the low-stage side compression chamber to the high-pressure chamber side, it is advantageous that the piston is composed of a roller and a blade separately. .

  On the other hand, in the high-stage compression mechanism, the pressure difference between the high-pressure chamber and the low-pressure chamber increases in the high-stage compression chamber, so that the refrigerant leaks from the high-pressure chamber toward the low-pressure chamber due to such a pressure difference. From the viewpoint of preventing a reduction in compression efficiency due to the above, it is advantageous that the piston is configured by integrating the roller and the blade.

  The object of the present invention is to prevent sliding parts from being damaged due to liquid compression performed by a low-stage compression mechanism and to prevent a reduction in compression efficiency due to refrigerant leaking by a high-stage compression mechanism. A stage compression compressor, and an air conditioner and a water heater using the compressor are provided.

  A compressor according to a first aspect of the present invention is a two-stage compression type compressor that further compresses the refrigerant compressed by the low-stage side compression mechanism by the high-stage side compression mechanism, and the low-stage side compression mechanism is the low-stage side compression mechanism. A high-stage compression is provided with a low-stage roller disposed in the compression chamber and a low-stage blade that is pressed against the outer peripheral surface of the low-stage roller and divides the low-stage compression chamber into a high-pressure chamber and a low-pressure chamber. The mechanism includes a high-stage roller disposed in the high-stage compression chamber, a high-stage blade extending from the outer peripheral surface of the high-stage roller, and dividing the high-stage compression chamber into a high-pressure chamber and a low-pressure chamber. Is provided.

  In this compressor, the low-stage compression mechanism includes a low-stage roller, a low-stage blade that is pressed against the outer peripheral surface of the low-stage roller and divides the low-stage compression chamber into a high-pressure chamber and a low-pressure chamber. With this configuration, even if liquid refrigerant is mixed in the gas refrigerant sucked into the low-pressure chamber of the low-stage compression chamber, the low-stage roller and the low-stage blade are configured separately. The mixed liquid refrigerant can be easily escaped toward the high pressure chamber side. Therefore, both the low-stage compression mechanism and the high-stage compression mechanism are abnormal due to liquid compression performed by the low-stage compression mechanism, compared to conventional compressors that use pistons that are configured integrally with rollers and blades. It is possible to prevent breakage of each sliding portion due to high pressure.

  Further, in this compressor, the high stage side compression mechanism includes a high stage side roller and a high stage that extends from the outer peripheral surface of the high stage side roller and divides the high stage side compression chamber into a high pressure chamber and a low pressure chamber. By configuring with the side blade, that is, by configuring the high-stage roller and the high-stage blade integrally in the high-stage compression mechanism, the pressure difference between the high-pressure chamber and the low-pressure chamber in the high-stage compression chamber is reduced. Even if it becomes larger, leakage of the refrigerant from the high-pressure chamber to the low-pressure chamber due to this pressure difference can be prevented by the high-stage blade, so both the low-stage compression mechanism and the high-stage compression mechanism Compared with the conventional compressor using the piston which comprised the braid | blade separately, the fall of compression efficiency can be prevented reliably.

  The compressor according to the second invention is the compressor according to the first invention, wherein the pressure difference between the high pressure chamber and the low pressure chamber of the high stage compression chamber is the difference between the high pressure chamber and the low pressure chamber of the low stage compression chamber. Greater than pressure difference.

  In this compressor, the pressure difference between the high-pressure chamber and the low-pressure chamber in the high-stage compression chamber is larger than the pressure difference between the high-pressure chamber and the low-pressure chamber in the low-stage compression chamber. Even when refrigerant leakage due to the pressure difference between the high-pressure chamber and the low-pressure chamber appears prominently, both the low-stage compression mechanism and the high-stage compression mechanism are composed of rollers and blades separately. As compared with the conventional compressor using the piston, the leakage of the refrigerant in the high-stage compression chamber can be reliably prevented.

A compressor according to a third invention is a compressor according to the first or second invention, and compresses the CO ₂ refrigerant.

In this compressor, when a high-pressure refrigerant such as a CO ₂ refrigerant is used, refrigerant leakage due to a pressure difference between the high-pressure chamber and the low-pressure chamber in the high-stage compression chamber generally appears more prominently. However, even in such a case, both the low-stage compression mechanism and the high-stage compression mechanism are higher in comparison with a conventional compressor using a piston in which rollers and blades are separately formed. Refrigerant leakage in the stage side compression chamber can be reliably prevented.

  In the air conditioner according to the fourth invention, the compressor according to any one of the first to third is used.

  In this air conditioner, the same effect as the first to third compressors can be obtained.

  In the water heater according to the fifth invention, the compressor according to any one of the first to third is used.

  In this water heater, the same effects as those of the first to third compressors can be obtained.

  As described above, according to the present invention, the following effects can be obtained.

  In the first invention, the low-stage side compression mechanism includes a low-stage side roller and a low-stage side blade that is pressed against the outer peripheral surface of the low-stage side roller and divides the low-stage side compression chamber into a high-pressure chamber and a low-pressure chamber. Even if liquid refrigerant is mixed in the gas refrigerant sucked into the low-pressure chamber of the low-stage compression chamber, the low-stage roller and the low-stage blade are configured separately. Therefore, the mixed liquid refrigerant can be easily released toward the high pressure chamber side. Therefore, both the low-stage compression mechanism and the high-stage compression mechanism are abnormal due to liquid compression performed by the low-stage compression mechanism, compared to conventional compressors that use pistons that are configured integrally with rollers and blades. It is possible to prevent breakage of each sliding portion due to high pressure.

  Furthermore, in the first invention, the high stage side compression mechanism includes a high stage side roller, a high stage extending from the outer peripheral surface of the high stage side roller, and dividing the high stage side compression chamber into a high pressure chamber and a low pressure chamber. By configuring with the stage side blade, that is, by configuring the high stage side roller and the high stage side blade integrally in the high stage side compression mechanism, the pressure difference between the high pressure chamber and the low pressure chamber in the high stage side compression chamber. Since the high-stage blade can prevent the refrigerant from leaking from the high-pressure chamber to the low-pressure chamber due to this pressure difference, both the low-stage compression mechanism and the high-stage compression mechanism As compared with a conventional compressor using a piston in which a blade and a blade are separately formed, a reduction in compression efficiency can be reliably prevented.

  In the second invention, the pressure difference between the high pressure chamber and the low pressure chamber in the high stage compression chamber is larger than the pressure difference between the high pressure chamber and the low pressure chamber in the low stage compression chamber. Even in the case where refrigerant leakage due to the pressure difference between the high-pressure chamber and the low-pressure chamber appears in the compression chamber, the roller and the blade are separated from each other in both the low-stage compression mechanism and the high-stage compression mechanism. Compared with the conventional compressor using the piston comprised with the body, the leakage of the refrigerant | coolant in a high stage side compression chamber can be prevented reliably.

In the third invention, when a high-pressure refrigerant such as CO ₂ refrigerant is used, refrigerant leakage due to the pressure difference between the high-pressure chamber and the low-pressure chamber in the high-stage compression chamber appears more prominently. However, even in such a case, both the low-stage compression mechanism and the high-stage compression mechanism are compared with conventional compressors using a piston in which rollers and blades are configured separately. Thus, leakage of the refrigerant in the high-stage compression chamber can be reliably prevented.

  In the fourth invention, the same effects as those of the first to third inventions can be obtained.

  In the fifth invention, the same effects as those of the first to third inventions can be obtained.

1 is a piping system diagram of an air conditioner to which a compressor according to an embodiment of the present invention is applied. It is sectional drawing which showed the internal structure of the compressor which concerns on one Embodiment of this invention. FIG. 3 is a top view of the low stage side cylinder shown in FIG. 2. FIG. 3 is a top view of the high stage side cylinder shown in FIG. 2.

  Hereinafter, an embodiment of a compressor according to the present invention will be described based on the drawings. FIG. 1 is a piping system diagram of an air conditioner to which a compressor according to an embodiment of the present invention is applied. FIG. 2 is a perspective view of the compressor according to the present invention. 3 and 4 are top views of the low-stage cylinder and the high-stage cylinder shown in FIG.

[Configuration of air conditioner]
As shown in FIG. 1, the air conditioner 10 is a heat pump type air conditioner using a CO ₂ refrigerant (hereinafter abbreviated as a refrigerant), and is configured to be switchable between a cooling operation and a heating operation. Yes. The refrigerant circuit 20 of the air conditioner 10 includes a compressor 30, a four-way switching valve 21, an outdoor heat exchanger 22 that is a heat source side heat exchanger, a first expansion valve E1 that is a first expansion mechanism, A main refrigerant circuit 2M in which a liquid separator 23, a second expansion valve E2 that is a second expansion mechanism, an indoor heat exchanger 24 that is a use side heat exchanger, and an accumulator 25 are sequentially connected by a refrigerant pipe 26 is provided. I have.

  The four-way switching valve 21 switches between a cooling operation in a state indicated by a solid line in FIG. 1 and a heating operation in a state indicated by a broken line in FIG. The refrigerant circuit 20 is provided with an injection pipe 2B. The injection pipe 2B is an introduction pipe for injecting an intermediate-pressure gas refrigerant, which is an intermediate-pressure fluid, into the compressor 30. One end side of the injection pipe 2B is a gas-liquid separator 23 and the other end side is a compressor 30. Communicating with

  That is, the gas-liquid separator 23 stores intermediate pressure refrigerant that is at an intermediate pressure between the condensation pressure of the refrigerant that is the high pressure fluid and the evaporation pressure of the refrigerant that is the low pressure fluid. The injection pipe 2 </ b> B injects a gas-phase intermediate-pressure gas refrigerant out of the intermediate-pressure refrigerant of the gas-liquid separator 23 into the compressor 30. The first expansion valve E1 and the second expansion valve E2 are constituted by electric valves whose opening degree can be freely adjusted. The intermediate pressure refrigerant decompressed by the first expansion valve E1 or the second expansion valve E2 is stored in the gas-liquid separator 23.

[Compressor configuration]
The compressor 30 is configured to be capable of controlling the operation capacity steplessly or in multiple stages, and is configured as a two-stage compressor as shown in FIG. The compressor 30 is configured by housing a motor 40, a low-stage side compression mechanism 5L, and a high-stage side compression mechanism 5H inside a sealed casing 31. The motor 40 includes a stator 41 fixed to the inner peripheral surface of the casing 31, and a rotor 42 disposed at the center of the stator 41. A drive shaft 32 is connected to the central portion of the rotor 42. As shown in FIG. 2, the drive shaft 32 extends downward and is connected to the low-stage compression mechanism 5L and the high-stage compression mechanism 5H.

  The bottom of the casing 31 is configured as a lubricating oil reservoir 33, and the lower end of the drive shaft 32 is immersed in the lubricating oil stored in the oil reservoir 33. A centrifugal oil pump (not shown) is provided at the lower end portion of the drive shaft 32, and the lubricant is passed through the oil supply passage 34 in the drive shaft 32 so that the lubricant is supplied to the low-stage compression mechanism 5L. And it is the structure which can be supplied with respect to each sliding location of the high stage side compression mechanism 5H.

  As shown in FIG. 2, the low-stage compression mechanism 5L and the high-stage compression mechanism 5H are located below the motor 40, and the high-stage compression mechanism 5H is disposed above the low-stage compression mechanism 5L. Yes. Further, a middle plate 6m is provided between the low stage side cylinder 60 of the low stage side compression mechanism 5L and the high stage side cylinder 70 of the high stage side compression mechanism 5H. The lower plate 6d is provided and closed, and the upper surface of the high stage side cylinder 70 is provided with an upper plate 6u and closed.

  As shown in FIG. 3, the low-stage compression mechanism 5 </ b> L is configured by housing a low-stage piston 61 in a low-stage compression chamber 6 s formed in the low-stage cylinder 60. The low-stage piston 61 includes an annular low-stage roller 61a, a low-stage blade 61b, and a spring 61c. Each of the low-stage roller 61a and the low-stage blade 61b includes It is composed of separate bodies. An eccentric shaft portion 62 on which the drive shaft 32 is mounted is rotatably fitted inside the low-stage piston 61 in the radial direction.

  In addition, a low-stage blade 61b and a spring 61c are disposed inside a guide groove formed on the radially outer side of the low-stage compression chamber 6s. The low-stage blade 61b is urged so as to press the outer peripheral surface of the low-stage roller 61a by a spring 61c. As shown in FIG. 3, the low-stage compression chamber 6 s is partitioned by a low-stage blade 61 b into a low-pressure chamber 6 sl that communicates with the suction passage 51 and a high-pressure chamber 6 sh that communicates with the discharge passage 53. .

  As shown in FIG. 3, a suction passage 51 is formed in the low-stage cylinder 60. One end of the suction passage 51 opens into the low-pressure chamber 6sl of the low-stage compression chamber 6s, thereby forming a suction port. ing. 2, the middle plate 6m is formed with a discharge passage 53 of the low-stage compression mechanism 5L, and one end of the discharge passage 53 opens into the high-pressure chamber 6sh of the low-stage compression chamber 6s. Thus, the discharge port is configured. The discharge passage 53 is provided with a discharge valve (not shown) that opens a discharge port when a predetermined discharge pressure is reached.

  As shown in FIG. 4, the high-stage compression mechanism 5 </ b> H is configured by housing a high-stage piston 71 inside a high-stage compression chamber 7 s formed in the high-stage cylinder 70. The high-stage piston 71 includes an annular high-stage roller 71a and a high-stage blade 71b, and the high-stage roller 71a and the high-stage blade 71b are integrally formed.

  As shown in FIG. 4, the high-stage compression chamber 7 s is partitioned by a high-stage blade 71 b into a low-pressure chamber 7 sl that communicates with the suction passage 52 and a high-pressure chamber 7 sh that communicates with the discharge passage 54. An eccentric shaft portion 72 on which the drive shaft 32 is mounted is rotatably fitted inside the high stage side piston 71 in the radial direction. The high-stage cylinder 70 is formed with an axial columnar bush hole 73 on the radially outer side of the high-stage compression chamber 7s. Inside the bush hole 73, the tip end portion of the high-stage blade 71b is inserted through a pair of swing bushes 7b.

  As shown in FIG. 4, a suction passage 52 is formed in the high-stage cylinder 70, and one end of the suction passage 52 opens into the low-pressure chamber 7sl of the high-stage compression chamber 7s, thereby forming a suction port. ing. As shown in FIG. 2, the upper plate 6u is formed with a discharge passage 54 of the high-stage compression mechanism 5H, and one end of the discharge passage 54 opens into the high-pressure chamber 7sh of the high-stage compression chamber 7s. Thus, the discharge port is configured. The discharge passage 54 is provided with a discharge valve (not shown) that opens a discharge port when a predetermined discharge pressure is reached.

  The pressure difference between the pressure in the high-pressure chamber 7sh and the pressure in the low-pressure chamber 7sl formed by dividing the high-stage compression chamber 7s with the high-stage blade 71b is the same as that of the low-stage blade 61b. The pressure difference between the pressure in the high-pressure chamber 6sh and the pressure in the low-pressure chamber 6sl formed by partitioning is made larger.

  As shown in FIG. 2, a suction side refrigerant pipe 2r of the main refrigerant circuit 2M is connected to the suction passage 51 of the low stage side compression mechanism 5L. The suction side refrigerant pipe 2r is configured as a suction pipe for supplying low-pressure gas refrigerant from the accumulator 25 to the low-stage compression mechanism 5L. An annular intermediate passage 55 is formed in the middle plate 6m. The injection pipe 2B communicates with the intermediate passage 55 by connecting the injection pipe 2B to the middle plate 6m. That is, the inside of the intermediate passage 55 is configured as an intermediate pressure atmosphere by supplying the intermediate pressure gas refrigerant.

  The discharge passage 53 of the low-stage compression mechanism 5L communicates with the intermediate passage 55, while the suction passage 52 of the high-stage compression mechanism 5H communicates with the intermediate passage 55, so that the intermediate pressure refrigerant is compressed at the high stage. The structure can be supplied to the mechanism 5H. Further, the discharge passage 54 of the high-stage compression mechanism 5H is opened inside the casing 31, and the inside of the casing 31 is configured in a high-pressure atmosphere.

  The upper portion of the casing 31 is connected to the discharge side refrigerant pipe 2d of the main refrigerant circuit 2M, and the discharge side refrigerant pipe 2d is configured as a discharge pipe for discharging high-pressure gas refrigerant. The upper plate 6u is provided with a muffler 65 for covering the discharge passage 54 of the high-stage compression mechanism 5H.

[Characteristics of the compressor of this embodiment]
As described above, in the compressor 30 of the present embodiment, the low-stage compression mechanism 5L is pressed against the low-stage roller 61a and the outer peripheral surface of the low-stage roller 61a, and the low-stage compression chamber 6s is replaced with the high-pressure chamber 6sh. By configuring with the low-stage blade 61b partitioned into the low-pressure chamber 6sl, liquid refrigerant is mixed in the low-pressure gas refrigerant sucked into the low-pressure chamber 6sl of the low-stage compression chamber 6s through the suction passage 51. However, since the low-stage roller 61a and the low-stage blade 61b are formed separately, the mixed liquid refrigerant can be easily released toward the high-pressure chamber 6sh side. Therefore, in both the low-stage compression mechanism and the high-stage compression mechanism, liquid compression is performed by the low-stage compression mechanism 5L as compared with the conventional compressor using the piston in which the roller and the blade are integrally formed. Can be prevented, and breakage of each sliding portion due to abnormally high pressure can be prevented.

  Further, in the compressor 30 of the present embodiment, the high stage side compression mechanism 5H extends from the high stage side roller 71a and the outer peripheral surface of the high stage side roller 71a, and the high stage side compression chamber 7s is connected to the high pressure chamber 7sh. And the high-stage blade 71b partitioned into the low-pressure chamber 7sl, that is, by configuring the high-stage roller 71a and the high-stage blade 71b integrally in the high-stage compression mechanism 5H, Even if the pressure difference between the high-pressure chamber 7sh and the low-pressure chamber 7sl in the stage-side compression chamber 7s increases, the high-stage blade 71b prevents the refrigerant from leaking from the high-pressure chamber 7sh to the low-pressure chamber 7sl due to this pressure difference. Therefore, in both the low-stage compression mechanism and the high-stage compression mechanism, the compression efficiency of the compressor 30 is reliably reduced as compared with the conventional compressor using the piston in which the roller and the blade are separately formed. To prevent It can be.

Further, in the case of using a CO ₂ refrigerant used at a higher pressure than an alternative refrigerant such as R410A as in the compressor 30 of the present embodiment, the low-pressure chamber 7sl and the high-pressure chamber 7sh in the high-stage compression chamber 7s are used. In general, the pressure difference increases and refrigerant leakage appears more prominently, but even in such a case, both the low-stage compression mechanism and the high-stage compression mechanism can Compared with a conventional compressor using a piston configured separately, refrigerant leakage in the high-stage compression chamber 7s can be prevented, and a reduction in compression efficiency of the compressor 30 can be reliably prevented.

  Further, as in the compressor 30 of the present embodiment, the pressure difference between the pressure in the high pressure chamber 7sh and the pressure in the low pressure chamber 7sl in the high stage compression chamber 7s is the pressure in the high pressure chamber 6sh in the low stage compression chamber 6s. This is a case in which the refrigerant pressure is larger than the pressure difference between the low pressure chamber 6sl and the refrigerant leakage due to the pressure difference between the pressure in the high pressure chamber 7sh and the pressure in the low pressure chamber 7sl appears in the high-stage compression chamber 7s. However, the leakage of the refrigerant in the high-stage compression chamber 7s can be prevented by the high-stage blade 71b, and both the low-stage compression mechanism and the high-stage compression mechanism are provided with a piston configured by separately forming a roller and a blade. Compared with the conventional compressor used, it is possible to reliably prevent a reduction in the compression efficiency of the compressor 30.

Table 1 below shows an example of conditions for each refrigerant. As is clear from Table 1, the pressure difference at the higher-stage compression chamber is larger than the pressure difference at the lower-stage compression chamber, the trend, than when using R410A as refrigerant, CO ₂ It becomes remarkable when using.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is indicated not only by the above description of the embodiments but also by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

In the above-described embodiment, an example in which the present invention is applied to a compressor that uses a CO ₂ refrigerant as a refrigerant has been described. However, the present invention uses an R410A refrigerant, an R22 refrigerant, or the like as a refrigerant in addition to the CO ₂ refrigerant. It is applicable to the compressor used as

  In the above-described embodiment, the example in which the low-stage compression mechanism 5L is arranged below the high-stage compression mechanism 5H in the compressor 30 has been described (see FIG. 2). It is not limited. In the compressor 30, the low-stage compression mechanism 5L may be disposed above the high-stage compression mechanism 5H.

  In the above-described embodiment, an example in which the compressor of the present invention is applied to an air conditioner has been described (see FIG. 1), but the present invention is not limited to such an embodiment. The compressor of the present invention is applicable not only to an air conditioner but also to a water heater.

5L Low stage side compression mechanism 5H High stage side compression mechanism 6s Low stage side compression chamber 7s High stage side compression chamber 6sl, 7sl Low pressure chamber 6sh, 7sh High pressure chamber 10 Air conditioner 30 Compressor 60 Low stage side cylinder 61 Low stage side Piston 61a Low stage side roller 61b Low stage side blade 70 High stage side cylinder 71 High stage side piston 71a High stage side roller 71b High stage side blade

Claims (5)

A two-stage compression compressor that further compresses the refrigerant compressed by the low-stage compression mechanism using the high-stage compression mechanism,
The low-stage compression mechanism is
A low-stage roller disposed in the low-stage compression chamber;
A low-stage blade that is pressed against the outer peripheral surface of the low-stage roller and divides the low-stage compression chamber into a high-pressure chamber and a low-pressure chamber;
The high stage compression mechanism is
A high-stage roller disposed in the high-stage compression chamber;
A compressor, comprising: a high-stage blade extending from an outer peripheral surface of the high-stage roller and partitioning the high-stage compression chamber into a high-pressure chamber and a low-pressure chamber.   2. The compressor according to claim 1, wherein a pressure difference between the high pressure chamber and the low pressure chamber of the high stage compression chamber is larger than a pressure difference between the high pressure chamber and the low pressure chamber of the low stage compression chamber. The compressor according to claim 1, wherein the compressor compresses a CO ₂ refrigerant.   The air conditioner using the compressor of any one of Claims 1-3.   A water heater using the compressor according to any one of claims 1 to 3.

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