JPH1114167A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a higher efficiency of an air conditioner in which R407C having a lower global warming coefficient than that of HCFC22 or R410A is applied in order to reduce influence to a global worming. SOLUTION: This air conditioner is constructed such that an auxiliary heat exchanger 5 is connecgted between a condenser 2 and a pressure reducing device 3, gas-liquid separator 6 is connected between the pressure reducing device 3 and an evaporator 4, gaseous refrigerant separated by the gas-liquid separator 6 is merged with the refrigerant passed through the evaporator 4 at a suction part of a compressor 1, and the liquid refrigerant separated at the gas-liquid separator 6 is fed into the evaporator 4. The auxiliary heat exchanger 5 is constructed such that the refrigerant between the condenser 2 and the pressure reducing device 3 is heat exchanged with the refrigerant at the suction part of the compressor 1. With such as arrangement as above, it is possible to improve an efficiency of an air conditioner and reduce a consumption power under both an efficient heat exchanging operation with the evaporator 4 and a reduction in pressure loss.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for reducing energy consumption.

[0002]

2. Description of the Related Art Conventionally, HCF has been used as a refrigerant for air conditioners.
C22 is widely used, and an air conditioner as shown in FIG. 5 has been proposed to increase the degree of supercooling at the inlet of the pressure reducer.

In FIG. 5, reference numeral 21 denotes a compressor, 22 denotes a condenser, 23 denotes a decompressor, and 24 denotes an evaporator. These are connected to a pipe to constitute a refrigeration cycle. An auxiliary heat exchanger 25 is provided for exchanging heat between the refrigerant between the condenser 22 and the decompressor 23 and the refrigerant between the evaporator 24 and the suction part of the compressor 21. Furthermore, HCFC22 is generally enclosed as a refrigerant.

The operation of the air conditioner having such a configuration will be described.

The refrigerant is compressed by the compressor 21 to become high temperature and high pressure, radiates heat in the condenser 22 to be condensed and liquefied, is introduced into the decompressor 23 through the auxiliary heat exchanger 25, and is decompressed by the decompressor 23. It becomes a low-temperature, low-pressure two-phase state, absorbs heat in the evaporator 24, evaporates and evaporates, and is sucked into the compressor 21 again. Here, the refrigerant condensed and liquefied in the condenser 22 exchanges heat with the refrigerant between the evaporator 24 and the suction part of the compressor 21 in the auxiliary heat exchanger 25 and is supercooled. Here, by subcooling the refrigerant in the auxiliary heat exchanger 25, the evaporator 24 can sufficiently utilize the latent heat of evaporation and efficiently absorb the same amount of heat absorbed, so that the evaporation pressure, that is, the suction pressure of the compressor 21 is reduced. As a result, the compression ratio in the compressor 21 decreases, the efficiency of the air conditioner improves, and the power consumption can be reduced. This will be described with reference to the pressure-enthalpy diagram of FIG. 6. A cooling effect (corresponding to a in FIG. 6) taken from the refrigerant at the suction portion of the compressor 21 at a low temperature by the external air having a relatively high temperature. By super-cooling the liquid refrigerant at the outlet of the condenser 22 (corresponding to b in FIG. 6), the refrigerant introduced into the evaporator 24 becomes a two-phase state with a small dryness. The enthalpy difference between the inlet and the outlet of the evaporator 24 is increased (corresponding to c in FIG. 6), that is, the latent heat of evaporation can be sufficiently utilized.

[0006]

However, in recent years,
Interest in the global environment has increased, and there is a need to reduce the amount of carbon dioxide, a global warming gas released into the atmosphere during the power generation process. Air that accounts for about 20% of the amount of electricity consumed in homes There is a problem that air conditioners must be made even more efficient in order to reduce the indirect impact of global warming caused by the carbon dioxide emitted when power is consumed by the air conditioners. .

[0007] From the viewpoint of protection of the ozone layer, HCFC22, which has been generally used as a refrigerant, slightly destroys the ozone layer.
5 / R407C which is a triple mixed refrigerant of HFC134a
Indicates that the global warming potential (GWP), which indicates the direct impact on global warming due to leakage or release of refrigerant itself, is HCFC22
Less than. However, according to a report at the International Symposium on HCFC22 Alternative Refrigerants held in Kobe in December 1996, R41, a leading candidate for HCFC22 alternative refrigerants, was
An air conditioner using 0A (a mixed refrigerant of two types of HFC32 / HFC125) has a feature that pressure loss in an evaporator or a suction pipe is small, and therefore, performance almost equal to that of a conventional HCFC22 is obtained. Since the pressure loss of the air conditioner using R407C is almost the same as that of the HCFC22, the performance is slightly lower than that of the air conditioner using the conventional HCFC22. Therefore, from the perspective of preventing global warming, in addition to the direct impact on global warming, indirect global warming due to carbon dioxide emitted when power consumption of air conditioners using the refrigerant is generated There is a problem that the air conditioner using R407C having a smaller GWP than HCFC22 or R410A must be further improved in efficiency.

The present invention has been made to solve the above problems, and has as its object to reduce the influence on indirect global warming by further improving the efficiency of an air conditioner.

Further, HFC32 / HF such as R407C
An object of the present invention is to protect the ozone layer and reduce the direct and indirect effects on global warming by further improving the efficiency of an air conditioner using a C125 / HFC134a triple refrigerant mixture.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a condenser 2 and a pressure reducer 3.
An auxiliary heat exchanger 5 is connected between them, a gas-liquid separator 6 is connected between the decompressor 3 and the evaporator 4, and the gas refrigerant separated by the gas-liquid separator 6 is supplied to a suction part of the compressor 1. The liquid refrigerant that has joined with the refrigerant that has passed through the evaporator 4 and that has been separated by the gas-liquid separator 6 is configured to be introduced into the evaporator 4. In the auxiliary heat exchanger 5, the condenser 2 and the decompressor 3 And heat exchange between the refrigerant in the compressor 1 and the refrigerant in the suction section of the compressor 1, the efficiency of the air conditioner can be improved by efficient heat exchange in the evaporator 4 and reduction of pressure loss. The amount of power can be reduced.

An auxiliary heat exchanger 5 is connected between the condenser 2 and the first decompressor 8, and a gas-liquid separator 6 is connected between the first decompressor 8 and the evaporator 4. The gas refrigerant separated by the device 6 is injected into the intermediate pressure section of the compressor 7, and the liquid refrigerant separated by the gas-liquid separator 6 is introduced into the evaporator 4 through the second decompressor 9. In the auxiliary heat exchanger 5,
By performing a heat exchange between the refrigerant between the condenser 2 and the first decompressor 8 and the refrigerant at the suction part of the compressor 7,
Efficient heat exchange in evaporator 4, reduction of pressure loss, and condenser 2
By increasing the flow rate of the refrigerant introduced into the air conditioner, the efficiency of the air conditioner is improved, and the power consumption can be reduced.

The gas refrigerant separated by the gas-liquid separator 6 is injected into the intermediate pressure section of the compressor 7 through the auxiliary heat exchanger 5, and the liquid refrigerant separated by the gas-liquid separator 6 is supplied to the second refrigerant. It is configured to be introduced into the evaporator 4 through the pressure reducer 9,
The auxiliary heat exchanger 5 exchanges heat between the refrigerant between the condenser 2 and the first decompressor 8 and the refrigerant between the gas-side outlet of the gas-liquid separator 6 and the intermediate-pressure part of the compressor 7. With such a configuration, the efficiency of the air conditioner can be improved and the power consumption can be reduced by efficient heat exchange and pressure loss reduction in the evaporator 4 and increase in the flow rate of the refrigerant introduced into the condenser 2.

Further, HFC32 / HFC12 is used as a refrigerant.
5 / HFC134a triple mixed refrigerant refrigerant, especially H
FC32 = 23wt%, HFC125 = 25%, HFC
134a = 52 wt% of a triple mixed refrigerant or HFC
32 = 25 wt%, HFC125 = 15%, HFC13
4a = 60 wt% mixed refrigerant of three kinds, or HFC32
= 30 wt%, HFC125 = 20%, HFC134a
= 50 wt% by using a mixed refrigerant of three types
Reduction of indirect impact on global warming due to carbon dioxide emitted to generate power consumption of air conditioners using the refrigerant, and direct global warming due to leakage and release of refrigerant itself Thus, a more desirable air conditioner can be realized from the viewpoint of preventing global warming.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. (Embodiment 1) FIG. 1 shows an air conditioner according to Embodiment 1 of the present invention. In FIG. 1, 1 is a compressor, 2 is a condenser, 3 is a decompressor, 4 is an evaporator, and these are connected to a pipe to constitute a refrigeration cycle. Also, an auxiliary heat exchanger 5 is connected between the condenser 2 and the pressure reducer 3,
A gas-liquid separator 6 is connected between the pressure reducer 3 and the evaporator 4. The gas refrigerant separated by the gas-liquid separator 6 merges with the refrigerant that has passed through the evaporator 4 at the suction portion of the compressor 1, and the liquid refrigerant separated by the gas-liquid separator 6 is introduced into the evaporator 4. It is configured. The auxiliary heat exchanger 5 is configured to exchange heat between the refrigerant between the condenser 2 and the pressure reducer 3 and the refrigerant at the suction part of the compressor 1.

The operation of the air conditioner having such a configuration will be described.

The refrigerant is compressed by the compressor 1, radiates heat in the condenser 2, condensed and liquefied, and is introduced into the auxiliary heat exchanger 5.
The refrigerant condensed and liquefied in the condenser 2 performs heat exchange with the refrigerant between the evaporator 4 and the suction part of the compressor 1 in the auxiliary heat exchanger 5,
After being supercooled, the heat is absorbed by the evaporator 4 through the decompressor 3 and the gas-liquid separator 6, evaporated and vaporized, and then sucked into the compressor 1 again.

Here, since the refrigerant supercooled by the auxiliary heat exchanger 5 is decompressed by the decompressor 3, the refrigerant passing through the decompressor 3 is a two-phase refrigerant having a small dryness. Vessel 6
Since the liquid refrigerant separated in the above is in a saturated liquid state, the evaporator 4
Becomes a saturated liquid state. That is, even if the gas refrigerant separated by the gas-liquid separator 6 bypasses the evaporator 4, the evaporator 4 can sufficiently utilize the latent heat of evaporation and efficiently absorb the same amount of heat absorbed. The suction pressure of the compressor 1 increases, the compression ratio in the compressor 1 decreases, the efficiency of the air conditioner improves, and the power consumption can be reduced.

Further, the gas refrigerant separated by the gas-liquid separator 6 is introduced into the suction portion of the compressor 1 by bypassing the evaporator 4, so that the decompressor 3 or the gas-liquid separator 6 to the evaporator 4 to the compressor It is possible to reduce the pressure loss between the suction sections, increase the suction pressure of the compressor 1 and reduce the compression ratio in the compressor 1, and further improve the efficiency of the air conditioner and reduce the power consumption. is there.

In FIG. 1, the gas refrigerant separated by the gas-liquid separator 6 is configured to join the refrigerant passing through the evaporator 4 between the evaporator 4 and the auxiliary heat exchanger 5. The configuration is not limited to this, and a configuration may be adopted in which the auxiliary heat exchanger 5 and the suction section of the compressor 1 merge. However, when the refrigerant becomes superheated gas at the outlet of the evaporator 4, the gas refrigerant separated by the gas-liquid separator 6 is transferred between the evaporator 4 and the auxiliary heat exchanger 5 by the refrigerant passing through the evaporator 4. Is preferable because the temperature of the refrigerant introduced into the auxiliary heat exchanger 5 can be reduced to near the saturated gas temperature, and the amount of heat exchange in the auxiliary heat exchanger 5 increases. (Embodiment 2) FIG. 2 shows an air conditioner according to Embodiment 2 of the present invention. 2, the same components as those in FIG. 1 are denoted by the same reference numerals. In FIG. 2, 7 is a compressor provided with an injection mechanism for the intermediate pressure section, 8 is a first decompressor, and 9 is a second decompressor. The gas refrigerant separated by the gas-liquid separator 6 is injected into the intermediate pressure section of the compressor 7, and the liquid refrigerant separated by the gas-liquid separator 6 is introduced into the evaporator 4 via the second decompressor 9. Is configured. The auxiliary heat exchanger 5 is configured to exchange heat between the refrigerant between the condenser 2 and the first decompressor 8 and the refrigerant at the suction part of the compressor 7.

The operation of the air conditioner having such a configuration will be described.

The refrigerant condensed and liquefied in the condenser 2 exchanges heat with the refrigerant between the evaporator 4 and the suction part of the compressor 7 in the auxiliary heat exchanger 5 and is supercooled. 8 is introduced. The refrigerant that has been decompressed by the first decompressor 8 and has become a low-temperature intermediate-pressure two-phase state is separated into a gas refrigerant and a liquid refrigerant by the gas-liquid separator 6, and the gas refrigerant bypasses the evaporator 4 and passes through the compressor 7. The liquid refrigerant is injected into the intermediate pressure section of the
, And is introduced into the evaporator 4.

Here, since the refrigerant supercooled by the auxiliary heat exchanger 5 is decompressed by the first decompressor 8, the refrigerant that has passed through the first decompressor 8 becomes a two-phase refrigerant having a low dryness. Since the liquid refrigerant separated by the liquid separator 6 is reduced in pressure from the saturated liquid state at the intermediate pressure to a low pressure in the second decompressor 9, it becomes a two-phase refrigerant having a small dryness. A two-phase state where the dryness is very small. That is, the gas-liquid separator 6
Even if the gas refrigerant separated in step (1) bypasses the evaporator 4, the evaporator 4 can sufficiently utilize the latent heat of evaporation and efficiently absorb the same amount of heat absorbed, so that the evaporation pressure, that is, the suction pressure of the compressor 7, rises. As a result, the compression ratio in the compressor 7 decreases, the efficiency of the air conditioner improves, and the power consumption can be reduced.

Further, the gas refrigerant separated by the gas-liquid separator 6 is injected into the intermediate pressure section of the compressor 7 by bypassing the evaporator 4, so that the first pressure reducer 8 or the gas-liquid separator 6 to the evaporator 4 -Since the pressure loss between the suction portions of the compressor 7 can be reduced, the suction pressure of the compressor 7 increases, the compression ratio in the compressor 7 decreases, the efficiency of the air conditioner can be further improved, and the power consumption can be reduced. In addition, since the flow rate of the refrigerant introduced into the condenser 2 can be increased, the heat radiation in the condenser 2 is efficiently performed, the efficiency of the air conditioner is improved, and the power consumption can be further reduced. Third Embodiment FIG. 3 shows an air conditioner according to a third embodiment of the present invention. 3, the same components as those in FIG. 1 are denoted by the same reference numerals. In FIG. 3, the gas refrigerant separated by the gas-liquid separator 6 passes through the auxiliary heat exchanger 5,
The liquid refrigerant injected into the intermediate pressure section of the compressor 7 and separated by the gas-liquid separator 6 passes through the second decompressor 9 to the evaporator 4.
It is configured to be introduced to The auxiliary heat exchanger 5 exchanges heat between the refrigerant between the condenser 2 and the first decompressor 8 and the refrigerant between the gas-side outlet of the gas-liquid separator 6 and the intermediate-pressure part of the compressor 7. It is configured as follows.

The operation of the air conditioner having such a configuration will be described.

The refrigerant condensed and liquefied in the condenser 2 exchanges heat with the refrigerant between the gas-side outlet of the gas-liquid separator 6 and the intermediate-pressure part of the compressor 7 in the auxiliary heat exchanger 5 and is supercooled. After that, it is introduced into the first decompressor 8.

The refrigerant which has been decompressed by the first decompressor 8 and has become a low-temperature intermediate-pressure two-phase state is separated into a gas refrigerant and a liquid refrigerant by the gas-liquid separator 6, and the gas refrigerant bypasses the evaporator 4. After subcooling the liquid refrigerant between the condenser 2 and the first decompressor 8 in the auxiliary heat exchanger 5, the liquid refrigerant is injected into the intermediate pressure section of the compressor 7, while the liquid refrigerant is supplied to the second decompressor 9 , And is introduced into the evaporator 4.

Here, since the refrigerant supercooled by the auxiliary heat exchanger 5 is depressurized by the first decompressor 8, the refrigerant passing through the first decompressor 8 becomes a two-phase refrigerant having a small dryness, and Since the liquid refrigerant separated by the liquid separator 6 is reduced in pressure from the saturated liquid state at the intermediate pressure to a low pressure in the second decompressor 9, it becomes a two-phase refrigerant having a small dryness. A two-phase state where the dryness is very small. That is, the gas-liquid separator 6
Even if the gas refrigerant separated in step (1) bypasses the evaporator 4, the evaporator 4 can sufficiently utilize the latent heat of evaporation and efficiently absorb the same amount of heat absorbed, so that the evaporation pressure, that is, the suction pressure of the compressor 7, rises. As a result, the compression ratio in the compressor 7 decreases, the efficiency of the air conditioner improves, and the power consumption can be reduced.

Further, the gas refrigerant separated by the gas-liquid separator 6 is injected into the intermediate pressure section of the compressor 7 by bypassing the evaporator 4, so that the first pressure reducer 8 or the gas-liquid separator 6 to the evaporator 4 -Since the pressure loss between the suction portions of the compressor 7 can be reduced, the suction pressure of the compressor 7 increases, the compression ratio in the compressor 7 decreases, the efficiency of the air conditioner can be further improved, and the power consumption can be reduced. In addition, since the flow rate of the refrigerant introduced into the condenser 2 can be increased, the heat radiation in the condenser 2 is efficiently performed, the efficiency of the air conditioner is improved, and the power consumption can be further reduced. (Embodiment 4) FIG. 4 shows an air conditioner according to Embodiment 4 of the present invention. 4, the same components as those in FIGS. 1 to 3 are denoted by the same reference numerals. In FIG. 4, in order to apply (Embodiment 1) to both cooling and heating,
A four-way valve 10 for switching between cooling and heating, an outdoor heat exchanger 11 acting as a condenser during cooling or as an evaporator during heating, an indoor heat exchanger 12 acting as an evaporator during cooling or as a condenser during heating, The check valves 13, 14, 15, 16 for restricting the flow direction are connected. That is, the refrigerant flows as shown by the solid arrow in FIG. 4 during cooling, and as shown by the dashed arrow in FIG. 4 during heating, and the power consumption is reduced both during cooling and during heating as described in the first embodiment. It can be reduced.

In the above (Embodiment 2) or (Embodiment 3), it has been described that the gas separated by the gas-liquid separator is injected into the intermediate pressure section of one compressor. The same effect can be obtained, for example, when two compressors are connected in series and the two compressors are connected in series between the discharge part of the low-stage compressor and the suction part of the high-stage compressor in two-stage compression. It is obtained. In this specification, including such a case, it is referred to as an intermediate pressure portion of the compressor.

In the above (Embodiment 4), (Embodiment 1) has been described as being applied to both cooling and heating.
The present invention is not limited to this. For the second embodiment and the third embodiment, the same air conditioner as the fourth embodiment can be obtained by appropriately connecting the four-way valve and the check valve. It is clear that this can be achieved.

In any of the above embodiments, the refrigerant is HFC32 / HFC125 / HFC13.
4a, especially HFC32 = 23wt
%, HFC125 = 25%, HFC134a = 52wt
% Mixed refrigerant (R407C) or HFC32
= 25 wt%, HFC125 = 15%, HFC134a
= 60 wt% of a triple mixed refrigerant, or HFC32 = 3
0 wt%, HFC125 = 20%, HFC134a = 5
When 0 wt% of a three-component mixed refrigerant is used, in addition to the reduction in power consumption due to the reduction in pressure loss and the like described in the above embodiment, Table 1 (IPCC December 11, 1995)
(Calculated based on the WG1 report)
Can be made smaller than HCFC22.

That is, the influence of carbon dioxide discharged to generate the power consumption of the air conditioner using the refrigerant on indirect global warming is reduced, and the leakage and discharge of the refrigerant itself are directly performed. Thus, it is possible to realize a more desirable air conditioner from the viewpoint of preventing global warming.

[0033]

[Table 1]

[0034]

As is apparent from the above description, in the air conditioner according to the present invention, the auxiliary heat exchanger is connected between the condenser and the decompressor, and the gas-liquid separation is performed between the decompressor and the evaporator. The gas refrigerant separated by the gas-liquid separator joins the refrigerant that has passed through the evaporator at the suction part of the compressor, and the liquid refrigerant separated by the gas-liquid separator is introduced into the evaporator. In the auxiliary heat exchanger, the heat exchange between the refrigerant between the condenser and the decompressor and the refrigerant at the suction part of the compressor is performed, so that efficient heat exchange and pressure in the evaporator are achieved. By reducing the loss, the efficiency of the air conditioner can be improved and the power consumption can be reduced.

In addition, an auxiliary heat exchanger is connected between the condenser and the pressure reducer, and a gas-liquid separator is connected between the pressure reducer and the evaporator.
The gas refrigerant separated by the gas-liquid separator is injected into the intermediate pressure part of the compressor, and the liquid refrigerant separated by the gas-liquid separator is configured to be introduced into the evaporator through the second decompressor,
In the auxiliary heat exchanger, heat is exchanged between the refrigerant between the condenser and the first decompressor and the refrigerant at the suction part of the compressor, so that efficient heat exchange and pressure loss reduction in the evaporator are achieved. By increasing the flow rate of the refrigerant introduced into the condenser, the efficiency of the air conditioner can be improved and the power consumption can be reduced.

The gas refrigerant separated by the gas-liquid separator is injected into the intermediate pressure section of the compressor through the auxiliary heat exchanger, and the liquid refrigerant separated by the gas-liquid separator is transmitted through the second decompressor. It is configured to be introduced into the evaporator, and in the auxiliary heat exchanger, between the refrigerant between the condenser and the first decompressor and the gas side outlet of the gas-liquid separator and the intermediate pressure part of the compressor. By configuring to exchange heat with the refrigerant, efficient heat exchange in the evaporator, reduction of pressure loss, and increase in the flow rate of refrigerant introduced into the condenser increase the efficiency of the air conditioner and reduce power consumption. Can be reduced.

As a refrigerant, HFC32 / HFC12
5 / HFC134a triple mixed refrigerant refrigerant, especially H
FC32 = 23wt%, HFC125 = 25%, HFC
134a = 52 wt% of a triple mixed refrigerant or HFC
32 = 25 wt%, HFC125 = 15%, HFC13
4a = 60 wt% mixed refrigerant of three kinds, or HFC32
= 30 wt%, HFC125 = 20%, HFC134a
= 50 wt% by using a mixed refrigerant of three types
Reduction of indirect impact on global warming due to carbon dioxide emitted to generate power consumption of air conditioners using the refrigerant, and direct global warming due to leakage and release of the refrigerant itself Thus, a more desirable air conditioner can be realized from the viewpoint of preventing global warming.

[Brief description of the drawings]

FIG. 1 is a refrigeration cycle diagram of an air conditioner according to Embodiment 1 of the present invention.

FIG. 2 is a refrigeration cycle diagram of an air conditioner according to Embodiment 2 of the present invention.

FIG. 3 is a refrigeration cycle diagram of an air conditioner according to Embodiment 3 of the present invention.

FIG. 4 is a refrigeration cycle diagram of an air conditioner according to Embodiment 4 of the present invention.

FIG. 5 is a refrigeration cycle diagram of a conventional air conditioner.

FIG. 6 is a pressure-enthalpy diagram of a conventional air conditioner.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 compressor 2 condenser 3 decompressor 4 evaporator 5 auxiliary heat exchanger 6 gas-liquid separator 7 compressor with intermediate pressure injection mechanism 8 first decompressor 9 second decompressor 10 four-way valve 11 outdoor heat exchanger 12 indoor Heat exchanger 13, 14, 15, 16 Check valve

Continued on the front page (51) Int.Cl. ⁶ Identification code FI F25B 13/00 331 F25B 13/00 331A

Claims (4)

[Claims] 1. An air conditioner in which at least a compressor, a condenser, a decompressor, and an evaporator are connected by piping, an auxiliary heat exchanger is connected between the condenser and the decompressor, and the decompressor and the evaporator are connected. A gas-liquid separator is connected therebetween, a gas-side outlet of the gas-liquid separator is connected between the evaporator and the compressor suction unit, and a liquid-side outlet of the gas-liquid separator is connected to the evaporator. An air conditioner, wherein the auxiliary heat exchanger exchanges heat between a refrigerant between the condenser and the decompressor and a refrigerant between the evaporator and the compressor suction section. 2. An air conditioner in which at least a compressor, a condenser, a first decompressor, and an evaporator are connected by piping, an auxiliary heat exchanger is connected between the condenser and the first decompressor, A gas-liquid separator is connected between the pressure reducer and the evaporator,
A gas-side outlet of the gas-liquid separator is connected to an intermediate pressure portion of the compressor, a liquid-side outlet of the gas-liquid separator is connected to the evaporator via a second decompressor, and the auxiliary heat exchanger By
An air conditioner wherein the refrigerant between the condenser and the first decompressor and the refrigerant between the evaporator and the suction part of the compressor exchange heat. 3. An air conditioner in which at least a compressor, a condenser, a first decompressor, and an evaporator are connected by piping, an auxiliary heat exchanger is connected between the condenser and the first decompressor, A gas-liquid separator is connected between the pressure reducer and the evaporator,
The gas-side outlet of the gas-liquid separator is connected to the intermediate pressure section of the compressor via the auxiliary heat exchanger, and the liquid-side outlet of the gas-liquid separator is connected to the evaporator via a second decompressor. Connected
The auxiliary heat exchanger exchanges heat between a refrigerant between the condenser and the first decompressor and a refrigerant between a gas-side outlet of the gas-liquid separator and the compressor intermediate pressure section. Harmony machine. 4. HFC32, HFC125,
The air conditioner according to any one of claims 1 to 3, wherein a three-type mixed refrigerant comprising HFC134a is used.