JPH1089794A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an operating efficiency of an air conditioner due to an expansion in a capacity variable width and to reduce dissipation power by providing an auxiliary heat exchanger bypass tube and a closing valve for closing flow of refrigerant to the bypass tube, and sealing unifunctional refrigerant containing no chlorine in a molecule or mixture refrigerant. SOLUTION: Unifunctional refrigerant containing no chlorine in a molecule or mixture refrigerant is sealed as refrigerant, a first closing valve is provided on the way of an auxiliary heat exchanger bypass tube 13, and a second closing valve 15 is provided between an auxiliary heat exchanger 5 and the tube 13. The exchanger 5 heat exchanges refrigerant fed to a pressure reducing unit 4 via the valve 15 with refrigerant discharged from a compressor 1 at the time of heating operation, and heat exchanges refrigerant to the valve 15 via the unit 4 with refrigerant discharged from the compressor 1 at the time of cooling operation. Accordingly, when a heating or cooling capacity is desired to be reduced, the auxiliary exchanger is operated to operate with the capacity or lower of lowest revolution speed of the compressor, and hence dissipation power can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner using a single refrigerant containing no chlorine in a molecule or a mixed refrigerant as a refrigerant.

[0002]

2. Description of the Related Art Conventionally, HCF has been used as a refrigerant for air conditioners.
C22 is widely used, and a configuration using an auxiliary heat exchanger 5 as shown in FIG. 5 is known to improve the cooling operation efficiency of the air conditioner. This is shown in FIG.
Explaining with reference to the pressure-enthalpy diagram of FIG. 22, the cooling effect (corresponding to a in FIG. 6) taken by the relatively high temperature outside air from the suction pipe of the compressor 1 which becomes low during the cooling operation is taken out of the condenser outlet. By utilizing the liquid for supercooling (corresponding to b in FIG. 6), it is possible to increase the cooling capacity (corresponding to c in FIG. 6) of the indoor heat exchanger 6 acting as an evaporator. You can do it.

[0003] There are two types of compressors: a constant rotation speed type and a variable rotation speed type. In the constant rotation speed type, the cooling capacity and the heating capacity are almost constant. I correspond. On the other hand, in the variable rotation speed type, the cooling capacity and heating capacity are adjusted by changing the rotation speed to respond to the air conditioning load, but the capacity variable width is mainly limited by the lower limit and upper limit of the compressor rotation speed, The air conditioning load below the lower limit of the capacity is handled by ON / OFF operation of the compressor.

[0004]

However, the HCF
The use of C22 is regulated to slightly destroy the stratospheric ozone layer, and a refrigerant that does not contain chlorine in its molecule has attracted attention as an alternative refrigerant.

Further, in order to cope with an air conditioning load having a cooling capacity lower limit or a heating capacity lower limit, ON / OFF of a compressor is required.
When the compressor is operated, the cooling capacity or the heating capacity is 0 while the compressor is stopped, so that the air-conditioning load is increased, and the compressor is started at a specified rotation speed larger than the minimum rotation speed when the compressor is started. There is a problem that power is consumed more than the operation at the number of rotations, and furthermore, a loss of cooling capacity or heating capacity in accordance with the heat capacity of the equipment is inevitable, resulting in an increase in power consumption.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has realized an improvement in operation efficiency and a reduction in power consumption in an air conditioner using a refrigerant that does not destroy the ozone layer by expanding a variable capacity range. It is intended to do so.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and has a compressor ON / OFF operation for responding to an air conditioning load having a cooling capacity lower limit or a heating capacity lower limit. Then, in order to solve the problem that the operating efficiency is reduced and the power consumption is increased and the problem that the ozone layer needs to be protected, as a means for further reducing the cooling capacity lower limit or the heating capacity lower limit, a decompressor and an indoor An auxiliary heat exchanger for exchanging heat between the refrigerant between the heat exchangers and the refrigerant discharged from the compressor to the four-way valve; and an auxiliary heat exchanger on the side where the refrigerant flows between the decompressor and the indoor heat exchanger of the auxiliary heat exchanger. An auxiliary heat exchanger bypass pipe that bypasses a side on which the refrigerant discharged from the compressor of the exchanger flows, a first shut-off valve that closes a flow of the refrigerant to the auxiliary heat exchanger bypass pipe, and an auxiliary heat exchanger. cold The second shut-off valve to close the flow provided, it is characterized in that the encapsulating single refrigerant or a mixed refrigerant containing no chlorine in their molecules.

Alternatively, an auxiliary heat exchanger for exchanging heat between the refrigerant between the decompressor and the outdoor heat exchanger and the refrigerant discharged from the compressor and reaching the four-way valve, a decompressor of the auxiliary heat exchanger and the outdoor heat exchanger An auxiliary heat exchanger bypass pipe that bypasses a side through which the refrigerant flows or a side through which the refrigerant discharged from the compressor of the auxiliary heat exchanger flows, and a first closure that closes a flow of the refrigerant to the auxiliary heat exchanger bypass pipe A valve and a second shut-off valve for shutting off the flow of the refrigerant to the auxiliary heat exchanger are provided, and a single refrigerant or a mixed refrigerant containing no chlorine in the molecule is sealed therein.

Alternatively, during the cooling operation, the refrigerant that has passed through the outdoor heat exchanger flows into the indoor heat exchanger through the first check valve, the auxiliary heat exchanger, the pressure reducer, and the third check valve. The refrigerant that has passed through the exchanger flows into the outdoor heat exchanger via the second check valve, the auxiliary heat exchanger, the pressure reducer, and the fourth check valve, and the auxiliary heat exchanger uses the first check valve or the second check valve. The refrigerant between the valve and the decompressor exchanges heat with the refrigerant discharged from the compressor, and the auxiliary heat exchanger bypass pipe connects the refrigerant between the first check valve or the second check valve of the auxiliary heat exchanger and the depressurizer. A first shut-off valve that bypasses the side through which the refrigerant flows from the side of the auxiliary heat exchanger or through which the refrigerant discharged from the compressor flows, and shuts off the flow of the refrigerant to the auxiliary heat exchanger bypass pipe; and the refrigerant to the auxiliary heat exchanger. A second shut-off valve to shut off the flow It is characterized in that the encapsulating.

[0010]

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 a first embodiment of the present invention. A single refrigerant or a mixed refrigerant containing no chlorine in the molecule is sealed as the refrigerant. In FIG. 1, an auxiliary heat exchanger bypass pipe 13 that bypasses the auxiliary heat exchanger 5 is provided between the indoor heat exchanger 6 and the decompressor 4. A second shutoff valve 15 is provided between the valve 14, the auxiliary heat exchanger 5 and the auxiliary heat exchanger bypass pipe 13. Further, the auxiliary heat exchanger 5 transfers the refrigerant reaching the decompressor 4 via the second shut-off valve 15 and the refrigerant discharged from the compressor 1 during the heating operation to the second shut-off valve 15 via the depressurizer 4 during the cooling operation. It is configured to exchange heat between the refrigerant flowing therethrough and the refrigerant discharged from the compressor 1.

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

First, during the heating operation, the four-way valve 2 is set as shown by the solid line in FIG. During a normal heating operation, the first closing valve 14 is opened and the second closing valve 15 is closed. Then, the gas refrigerant compressed to a high temperature and a high pressure by the compressor 1 is introduced into the indoor heat exchanger 6 through the auxiliary heat exchanger 5 and the four-way valve 2. Here, the gas refrigerant exchanges heat with room air to release heat and condense to become a liquid refrigerant.

Further, the refrigerant condensed in the indoor heat exchanger 6 to be in a liquid state is introduced into the pressure reducer 4 through the auxiliary heat exchanger bypass pipe 13 during a normal heating operation. That is, heat exchange is not performed in the auxiliary heat exchanger 5. The refrigerant which has been decompressed by the decompressor 4 and has become a low-temperature and low-pressure two-phase state is
Will be introduced. In the outdoor heat exchanger 3, the refrigerant exchanges heat with outdoor air, absorbs heat, evaporates, and becomes a low-temperature low-pressure gas refrigerant. Further, the refrigerant evaporated in the outdoor heat exchanger 3 into a low-temperature low-pressure gas state is sucked into the compressor 1 through the four-way valve 2.

Next, when it is desired to make the heating capacity even smaller than when the compressor 1 is operating at the minimum rotational speed, the first closing valve 14 is closed and the second closing valve 15 is opened. Then, the gas refrigerant compressed to a high temperature and a high pressure by the compressor 1 is introduced into the indoor heat exchanger 6 through the auxiliary heat exchanger 5 and the four-way valve 2. Here, the gas refrigerant exchanges heat with room air to release heat and condense to become a liquid refrigerant.

Further, the refrigerant condensed in the indoor heat exchanger 6 to be in a liquid state is introduced into the auxiliary heat exchanger 5 through the second shut-off valve 15 which is set to be open. At this time, in the auxiliary heat exchanger 5, the high-temperature refrigerant discharged from the compressor 1 is cooled by the refrigerant that has released heat in the indoor heat exchanger 6 and is in a liquid state,
Since the temperature of the refrigerant introduced into the indoor heat exchanger 6 decreases, the amount of heat released to the indoor air in the indoor heat exchanger 6 decreases, and the heating capacity can be reduced.

The refrigerant which has been decompressed by the decompressor 4 via the auxiliary heat exchanger 5 and is in a low-temperature and low-pressure two-phase state is introduced into the outdoor heat exchanger 3. In the outdoor heat exchanger 3, the refrigerant exchanges heat with outdoor air, absorbs heat, evaporates, and becomes a low-temperature low-pressure gas refrigerant.
Further, the refrigerant evaporated in the outdoor heat exchanger 3 into a low-temperature low-pressure gas state is sucked into the compressor 1 through the four-way valve 2.

Next, during the cooling operation, the four-way valve 2 is set as shown by the dotted line in FIG. During normal cooling operation, the first closing valve 14 is opened and the second closing valve 15 is closed. Then, the gas refrigerant compressed to a high temperature and a high pressure by the compressor 1 is introduced into the outdoor heat exchanger 3 through the auxiliary heat exchanger 5 and the four-way valve 2. Here, the gas refrigerant exchanges heat with outdoor air, radiates heat, condenses, and becomes a liquid refrigerant.

Further, the refrigerant condensed in the outdoor heat exchanger 3 to be in a liquid state is decompressed by the decompressor 4 to be in a low-temperature and low-pressure two-phase state. During normal cooling operation, the auxiliary heat exchanger bypass pipe 13 is connected. After that, it is introduced into the indoor heat exchanger 6. That is, heat exchange is not performed in the auxiliary heat exchanger 5. Indoor heat exchanger 6
The refrigerant exchanges heat with the air in the room, absorbs heat, evaporates and becomes a low-temperature low-pressure gas refrigerant, and is sucked into the compressor 1 through the four-way valve 2.

Next, when it is desired to make the cooling capacity smaller than that at the time of operating the compressor 1 at the minimum rotation speed, the first stop valve 14 is closed and the second stop valve 15 is opened. Then, the gas refrigerant compressed to a high temperature and a high pressure by the compressor 1 is introduced into the outdoor heat exchanger 3 through the auxiliary heat exchanger 5 and the four-way valve 2. Here, the gas refrigerant exchanges heat with outdoor air, radiates heat, condenses, and becomes a liquid refrigerant.

Further, the refrigerant condensed in the outdoor heat exchanger 3 to be in a liquid state is decompressed by the decompressor 4 to be in a low-temperature low-pressure two-phase state, and the first shut-off valve 14 is set to be closed. It is introduced into the auxiliary heat exchanger 5. At this time, in the auxiliary heat exchanger 5, as shown in the pressure-enthalpy diagram of FIG.
The refrigerant which has been decompressed by the decompressor 4 and becomes low temperature and low pressure by the high-temperature refrigerant (a in FIG. 2) discharged from the heater is heated (b in FIG. 2) and introduced into the indoor heat exchanger 6 Since the enthalpy of the indoor heat exchanger rises, the difference in enthalpy between the inlet and the outlet of the indoor heat exchanger becomes small, the amount of heat absorbed from the indoor air in the indoor heat exchanger 6 decreases, and the cooling capacity can be reduced.

Further, the refrigerant evaporated in the indoor heat exchanger 6 into a low-temperature and low-pressure gas state passes through the four-way valve 2 and the compressor 1.
Inhaled.

As described above, the ozone layer is not destroyed by using a single refrigerant or a mixed refrigerant containing no chlorine in the molecule, and the auxiliary heat exchanger 5 is used when the heating capacity or the cooling capacity is to be reduced. By operating the compressor, it is possible to operate the compressor at a capacity equal to or lower than the minimum rotational speed, so that the frequency of the ON / OFF operation of the compressor 1 can be reduced, and the power consumption can be reduced.

In FIG. 1, the auxiliary heat exchanger bypass pipe 13, the first shut-off valve 14, and the second shut-off valve 15 are described as being provided between the indoor heat exchanger 6 and the decompressor 4. Obviously, the same effect can be obtained even if provided between the discharge side of the compressor 1 and the four-way valve 2.

(Embodiment 2) FIG. 3 shows an air conditioner according to a second embodiment of the present invention. In FIG. 3, the same components as those in FIG. 1 are denoted by the same reference numerals. A single refrigerant or a mixed refrigerant containing no chlorine in the molecule is sealed as the refrigerant. In FIG. 3, an auxiliary heat exchanger bypass pipe 13 that bypasses the auxiliary heat exchanger 5 is provided between the outdoor heat exchanger 3 and the decompressor 4. A second shutoff valve 15 is provided between the valve 14 and the auxiliary heat exchanger 5 and the auxiliary heat exchanger bypass pipe 13.
Is provided. In addition, the auxiliary heat exchanger 5 receives the refrigerant having passed through the decompressor 4 and the second shut-off valve 15 and the refrigerant discharged from the compressor 1 during the heating operation, and the second shut-off valve 15 through the outdoor heat exchanger 3 during the cooling operation. And the refrigerant discharged from the compressor 1 is subjected to heat exchange.

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

First, during the heating operation, the four-way valve 2 is set as shown by the solid line in FIG. During a normal heating operation, the first closing valve 14 is opened and the second closing valve 15 is closed. Then, the gas refrigerant compressed to a high temperature and a high pressure by the compressor 1 is introduced into the indoor heat exchanger 6 through the auxiliary heat exchanger 5 and the four-way valve 2. Here, the gas refrigerant exchanges heat with room air to release heat and condense to become a liquid refrigerant.

Further, the refrigerant which has been condensed in the indoor heat exchanger 6 to be in a liquid state is depressurized by the decompressor 4 during normal heating operation to be in a two-phase state of low temperature and low pressure and passes through the auxiliary heat exchanger bypass pipe 13. It is introduced into the outdoor heat exchanger 3. That is, heat exchange is not performed in the auxiliary heat exchanger 5. In the outdoor heat exchanger 3, the refrigerant exchanges heat with outdoor air, absorbs heat, evaporates, and becomes a low-temperature low-pressure gas refrigerant. Further, the refrigerant evaporated in the outdoor heat exchanger 3 into a low-temperature low-pressure gas state is sucked into the compressor 1 through the four-way valve 2.

Next, when it is desired to make the heating capacity even smaller than when the compressor 1 is operated at the minimum rotation speed, the first closing valve 14 is closed and the second closing valve 15 is opened. Then, the gas refrigerant compressed to a high temperature and a high pressure by the compressor 1 is introduced into the indoor heat exchanger 6 through the auxiliary heat exchanger 5 and the four-way valve 2. Here, the gas refrigerant exchanges heat with room air to release heat and condense to become a liquid refrigerant.

Further, the refrigerant condensed in the indoor heat exchanger 6 to be in a liquid state is decompressed by the decompressor 4 to be in a two-phase state of low temperature and low pressure, and is assisted through the second closing valve 15 which is set to open. The heat is introduced into the heat exchanger 5. At this time, in the auxiliary heat exchanger 5,
The high-temperature refrigerant discharged from the compressor 1 is cooled by the low-temperature refrigerant which has been decompressed by the decompressor 4, and the temperature of the refrigerant introduced into the indoor heat exchanger 6 decreases. In this case, the amount of heat released to the indoor air is reduced, and the heating capacity can be reduced.

The refrigerant introduced into the outdoor heat exchanger 3 via the auxiliary heat exchanger 5 exchanges heat with the outdoor air, absorbs heat, evaporates, and becomes a low-temperature low-pressure gas refrigerant. Furthermore, the outdoor heat exchanger 3
The refrigerant evaporated into a low-temperature and low-pressure gas state through the four-way valve 2 is sucked into the compressor 1.

Next, during the cooling operation, the four-way valve 2 is set as shown by the dotted line in FIG. During normal cooling operation, the first closing valve 14 is opened and the second closing valve 15 is closed. Then, the gas refrigerant compressed to a high temperature and a high pressure by the compressor 1 is introduced into the outdoor heat exchanger 3 through the auxiliary heat exchanger 5 and the four-way valve 2. Here, the gas refrigerant exchanges heat with outdoor air, radiates heat, condenses, and becomes a liquid refrigerant.

Further, the refrigerant condensed in the outdoor heat exchanger 3 to be in a liquid state is introduced into the decompressor 4 through the auxiliary heat exchanger bypass pipe 13 during a normal cooling operation. That is, heat exchange is not performed in the auxiliary heat exchanger 5. The refrigerant that has been decompressed by the decompressor 4 and has become a low-temperature low-pressure two-phase state exchanges heat with indoor air in the indoor heat exchanger 6, absorbs heat and evaporates, and becomes a low-temperature low-pressure gas refrigerant. Further, the refrigerant evaporated into a low-temperature low-pressure gas state in the indoor heat exchanger 6 is sucked into the compressor 1 through the four-way valve 2.

Next, when it is desired to make the cooling capacity smaller than that at the time of operating the compressor 1 at the minimum rotation speed, the first closing valve 14 is closed and the second closing valve 15 is opened. Then, the gas refrigerant compressed to a high temperature and a high pressure by the compressor 1 is introduced into the outdoor heat exchanger 3 through the auxiliary heat exchanger 5 and the four-way valve 2. Here, the gas refrigerant exchanges heat with outdoor air, radiates heat, condenses, and becomes a liquid refrigerant.

Further, the refrigerant condensed in the outdoor heat exchanger 3 to be in a liquid state is introduced into the auxiliary heat exchanger 5 because the first shut-off valve 14 is set to be closed. At this time, in the auxiliary heat exchanger 5, since the refrigerant introduced into the decompressor 4 is heated by the high-temperature refrigerant discharged from the compressor 1, the enthalpy of the refrigerant introduced into the indoor heat exchanger 6 increases. In addition, the enthalpy difference between the inlet and outlet of the indoor heat exchanger becomes smaller, and the amount of heat absorbed from indoor air in the indoor heat exchanger 6 decreases,
The cooling capacity can be reduced.

Further, the refrigerant is decompressed by the decompressor 4 to be in a low-temperature and low-pressure two-phase state, and the refrigerant which has been evaporated in the indoor heat exchanger 6 to be in a low-temperature and low-pressure gas state passes through the four-way valve 2 and the compressor 1. Inhaled.

As described above, the ozone layer is not destroyed by using the single refrigerant or the mixed refrigerant containing no chlorine in the molecule, and the auxiliary heat exchanger 5 is used when the heating capacity or the cooling capacity is required to be smaller. By operating the compressor 1, the compressor 1 can be operated at a speed equal to or lower than the minimum rotational speed, the frequency of ON / OFF operation of the compressor 1 can be reduced, and the power consumption can be reduced.

In FIG. 3, the auxiliary heat exchanger bypass pipe 13, the first shut-off valve 14, and the second shut-off valve 15 are described as being provided between the outdoor heat exchanger 3 and the decompressor 4. Obviously, the same effect can be obtained even if provided between the discharge side of the compressor 1 and the four-way valve 2.

(Embodiment 3) FIG. 4 shows an air conditioner according to a third embodiment of the present invention. In FIG. 4, the same components as those in FIG. 1 or FIG. 3 are denoted by the same reference numerals.
A single refrigerant or a mixed refrigerant containing no chlorine in the molecule is sealed as the refrigerant. In FIG. 4, the refrigerant that has become liquid in the outdoor heat exchanger 3 during the cooling operation passes through the first check valve 7, and the refrigerant that has become liquid in the indoor heat exchanger 6 during the heating operation is the second check valve. 4 flows from the left side to the right side in FIG. 4 through the auxiliary heat exchanger 5 and is decompressed by the decompressor 4. During the cooling operation, the indoor heat exchanger 6 passes through the third check valve 9.
In the heating operation, the air flows through the fourth check valve 10 to the outdoor heat exchanger 3. On the other hand, the refrigerant discharged from the compressor 1 is configured to flow through the auxiliary heat exchanger 5 from right to left in FIG.

An auxiliary heat exchanger bypass pipe 13 for bypassing the auxiliary heat exchanger 5 is provided between the first check valve 7 or the second check valve 8 and the pressure reducer 4, and is further provided with an auxiliary heat exchanger bypass pipe. In the middle of 13, a first shut-off valve 14 and a second shut-off valve 15 between the auxiliary heat exchanger 5 and the auxiliary heat exchanger bypass pipe 13 are provided.

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

First, during the heating operation, the four-way valve 2 is set as shown by the solid line in FIG. During a normal heating operation, the first closing valve 14 is opened and the second closing valve 15 is closed. Then, the gas refrigerant compressed to a high temperature and a high pressure by the compressor 1 is introduced into the indoor heat exchanger 6 through the auxiliary heat exchanger 5 and the four-way valve 2. Here, the gas refrigerant exchanges heat with the indoor air to release heat and condense to become a liquid refrigerant.

Further, the refrigerant which has been condensed in the indoor heat exchanger 6 to be in a liquid state is supplied to the second check valve 8 during normal heating operation.
It is introduced into the pressure reducer 4 via the auxiliary heat exchanger bypass pipe 13. That is, heat exchange is not performed in the auxiliary heat exchanger 5. The refrigerant which has been decompressed by the decompressor 4 and has become a low-temperature and low-pressure two-phase state is introduced into the outdoor heat exchanger 3 through the fourth check valve 10, exchanges heat with outdoor air, absorbs heat, evaporates, and evaporates. And is sucked into the compressor 1 via the four-way valve 2.

Next, when it is desired to make the heating capacity even smaller than when the compressor 1 is operating at the minimum rotational speed, the first closing valve 14 is closed and the second closing valve 15 is opened. Then, the gas refrigerant compressed to a high temperature and a high pressure by the compressor 1 is introduced into the indoor heat exchanger 6 through the auxiliary heat exchanger 5 and the four-way valve 2. Here, the gas refrigerant exchanges heat with the indoor air to release heat and condense to become a liquid refrigerant.

Further, the refrigerant condensed in the indoor heat exchanger 6 into a liquid state is introduced into the auxiliary heat exchanger 5 through the second check valve 8 and the second close valve 15 which is set to be open. . At this time, in the auxiliary heat exchanger 5, the high-temperature refrigerant discharged from the compressor 1 is cooled by the refrigerant radiated to the indoor air by the indoor heat exchanger 6, and the temperature of the refrigerant introduced into the indoor heat exchanger 6 Is reduced, the amount of heat released to the indoor air in the indoor heat exchanger 6 is reduced, and the heating capacity can be reduced.

The refrigerant which has been decompressed by the decompressor 4 through the auxiliary heat exchanger 5 and has become low-temperature and low-pressure is introduced into the outdoor heat exchanger 3 through the fourth check valve 10 and exchanges heat with outdoor air. It absorbs heat and evaporates to become a low-temperature low-pressure gas refrigerant, which is sucked into the compressor 1 via the four-way valve 2.

Next, during the cooling operation, the four-way valve 2 is set as shown by the dotted line in FIG. During normal cooling operation, the first closing valve 14 is opened and the second closing valve 15 is closed. Then, the gas refrigerant compressed to a high temperature and a high pressure by the compressor 1 is introduced into the outdoor heat exchanger 3 through the auxiliary heat exchanger 5 and the four-way valve 2. Here, the gas refrigerant exchanges heat with outdoor air, radiates heat, condenses, and becomes a liquid refrigerant.

Further, the refrigerant condensed in the outdoor heat exchanger 3 to a liquid state is supplied to the first check valve 7 during normal cooling operation.
It is introduced into the decompressor 4 via the auxiliary heat exchanger bypass pipe 13. That is, heat exchange is not performed in the auxiliary heat exchanger 5.
The refrigerant which has been decompressed by the decompressor 4 and has become a low-temperature and low-pressure two-phase state passes through a third check valve 9 and exchanges heat with the indoor air in the indoor heat exchanger 6 to absorb heat and evaporate, thereby evaporating to a low-temperature and low-pressure gas. Becomes a refrigerant,
It is sucked into the compressor 1 via the four-way valve 2.

Next, when it is desired to make the cooling capacity smaller than when the compressor 1 is operated at the minimum rotation speed, the first closing valve 14 is closed and the second closing valve 15 is opened. Then, the gas refrigerant compressed to a high temperature and a high pressure by the compressor 1 is introduced into the outdoor heat exchanger 3 through the auxiliary heat exchanger 5 and the four-way valve 2. Here, the gas refrigerant exchanges heat with outdoor air, radiates heat, condenses, and becomes a liquid refrigerant.

Further, the refrigerant condensed in the outdoor heat exchanger 3 to be in a liquid state is introduced into the auxiliary heat exchanger 5 through the first check valve 7 and the second close valve 15 set to be open. . At this time, in the auxiliary heat exchanger 5, the refrigerant introduced into the decompressor 4 is heated by the high-temperature refrigerant discharged from the compressor 1,
Since the enthalpy of the refrigerant introduced into the indoor heat exchanger 6 increases, the enthalpy difference between the inlet and the outlet of the indoor heat exchanger becomes small, the amount of heat absorbed from the indoor air in the indoor heat exchanger 6 decreases, and The ability can be reduced.

Further, the refrigerant is depressurized by the decompressor 4 to be in a low-temperature and low-pressure two-phase state, and is evaporated in the indoor heat exchanger 6 through the third check valve 9 to be in a low-temperature and low-pressure gas state. After that, it is sucked into the compressor 1.

As described above, the ozone layer is not destroyed by using a single refrigerant or a mixed refrigerant containing no chlorine in the molecule, and the auxiliary heat exchanger 5 is used when it is desired to reduce the heating capacity or the cooling capacity. By operating the compressor, it is possible to operate the compressor at a capacity equal to or lower than the minimum rotational speed, so that the frequency of the ON / OFF operation of the compressor 1 can be reduced, and the power consumption can be reduced. In addition, in both the heating operation and the cooling operation, the auxiliary heat exchanger 5 can make the flow counter-current, so that the heat exchange can be performed efficiently.

In FIG. 4, the auxiliary heat exchanger bypass pipe 13, the first stop valve 14, and the second stop valve 15 are provided between the first check valve 7 or the second check valve 8 and the pressure reducer 4. Although described as being provided, it is clear that the same effect can be obtained even if provided between the discharge side of the compressor 1 and the four-way valve 2. Further, the pressure reducer 4 does not necessarily need to be provided downstream of the auxiliary heat exchanger 5, and may be provided between the first check valve 7 or the second check valve 8 and the auxiliary heat exchanger bypass pipe, or Obviously, the same effect can be obtained by providing the same.

[0054]

As described above, in the air conditioner according to the present invention, the auxiliary heat exchanger for exchanging heat between the refrigerant between the decompressor and the indoor heat exchanger and the refrigerant discharged from the compressor and reaching the four-way valve is provided. An auxiliary heat exchanger bypass pipe for bypassing a side of the auxiliary heat exchanger where the refrigerant flows between the decompressor and the indoor heat exchanger or a side where the refrigerant discharged from the compressor of the auxiliary heat exchanger flows, and an auxiliary heat exchanger. A first shut-off valve that shuts off the flow of refrigerant to the bypass pipe and a second shut-off valve that shuts off the flow of refrigerant to the auxiliary heat exchanger are filled with a single refrigerant or mixed refrigerant that does not contain chlorine in the molecule. By doing so, the ozone layer is not destroyed, and when it is desired to make the heating capacity or cooling capacity smaller, by operating the auxiliary heat exchanger, it is possible to operate at a capacity less than the minimum rotation speed of the compressor, ON / OF of compressor It is possible to reduce the amount of power consumption can reduce the frequency of operation.

Further, an auxiliary heat exchanger for exchanging heat between the refrigerant between the decompressor and the outdoor heat exchanger and the refrigerant discharged from the compressor and reaching the four-way valve, a decompressor of the auxiliary heat exchanger and the outdoor heat exchanger An auxiliary heat exchanger bypass pipe that bypasses a side through which the refrigerant flows or a side through which the refrigerant discharged from the compressor of the auxiliary heat exchanger flows, and a first closure that closes a flow of the refrigerant to the auxiliary heat exchanger bypass pipe By providing a valve and a second shut-off valve for shutting off the flow of the refrigerant to the auxiliary heat exchanger, and by enclosing a single refrigerant or a mixed refrigerant containing no chlorine in the molecule, the ozone layer is not destroyed, When it is desired to make the heating capacity or the cooling capacity smaller, by operating the auxiliary heat exchanger, it is possible to operate the compressor at a capacity lower than the minimum rotational speed, thereby reducing the frequency of ON / OFF operation of the compressor. Low power consumption Can Kusuru.

During the cooling operation, the refrigerant that has passed through the outdoor heat exchanger flows into the indoor heat exchanger through the first check valve, the auxiliary heat exchanger, the pressure reducer, and the third check valve. The refrigerant that has passed through the exchanger is the second check valve, auxiliary heat exchanger, pressure reducer,
The refrigerant flows into the outdoor heat exchanger via the fourth check valve, and in the auxiliary heat exchanger, heat exchanges the refrigerant between the first check valve or the second check valve and the pressure reducer with the refrigerant discharged from the compressor. The auxiliary heat exchanger bypass pipe is connected to the side of the auxiliary heat exchanger where the refrigerant flows between the first check valve or the second check valve and the pressure reducer or the side where the refrigerant discharged from the compressor of the auxiliary heat exchanger flows. A first shut-off valve for bypassing and closing the flow of the refrigerant to the auxiliary heat exchanger bypass pipe, and a second shut-off valve for closing the flow of the refrigerant to the auxiliary heat exchanger are provided. By enclosing one refrigerant or mixed refrigerant, the ozone layer is not destroyed, and when it is desired to make the heating capacity or the cooling capacity smaller, the auxiliary heat exchanger is operated to reduce the capacity at the minimum speed of the compressor. ON / OFF of the compressor It is possible to reduce the amount of power consumption can reduce the frequency of F operation. In addition, in both the heating operation and the cooling operation, the auxiliary heat exchanger can make the flow counter-current, so that the heat exchange can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a pressure-enthalpy diagram in the air conditioner according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram of an air conditioner according to a second embodiment of the present invention.

FIG. 4 is a schematic diagram of an air conditioner according to a third embodiment of the present invention.

FIG. 5 is a schematic diagram of an air conditioner according to a conventional mode.

FIG. 6 is a pressure-enthalpy diagram of an air conditioner according to a conventional mode.

[Explanation of symbols]

 1: Compressor 2: Four-way valve 3: Outdoor heat exchanger 4: Depressurizer 5: Auxiliary heat exchanger 6: Indoor heat exchanger 7: First check valve 8: Second check valve 9: Third check Valve 10: Fourth check valve 11: First decompressor 12: Second decompressor 13: Auxiliary heat exchanger bypass pipe 14: First shutoff valve 15: Second shutoff valve A: Outdoor unit B: Indoor unit

Claims (3)

[Claims] An air conditioner in which at least a compressor, a four-way valve for switching between a cooling operation and a heating operation, an outdoor heat exchanger and a decompressor, and an indoor unit including at least an indoor heat exchanger are pipe-connected. A single refrigerant or a mixed refrigerant containing no chlorine in the molecule is sealed therein, and heat exchange between the refrigerant between the decompressor and the indoor heat exchanger and the refrigerant discharged from the compressor and reaching the four-way valve is performed. Heat exchanger,
An auxiliary heat exchanger bypass pipe that bypasses a side of the auxiliary heat exchanger through which the refrigerant flows between the decompressor and the indoor heat exchanger or a side of the auxiliary heat exchanger through which the refrigerant discharged from the compressor flows, An air conditioner comprising: a first shutoff valve for closing a flow of a refrigerant to the auxiliary heat exchanger bypass pipe; and a second shutoff valve for closing a flow of a refrigerant to the auxiliary heat exchanger. 2. An air conditioner in which at least a compressor, a four-way valve for switching between a cooling operation and a heating operation, an outdoor heat exchanger and an outdoor unit comprising a decompressor, and at least an indoor unit comprising an indoor heat exchanger are pipe-connected. A single refrigerant or a mixed refrigerant containing no chlorine in the molecule is sealed therein, and a heat exchange between the refrigerant between the decompressor and the outdoor heat exchanger and the refrigerant discharged from the compressor and reaching the four-way valve is performed. Heat exchanger,
An auxiliary heat exchanger bypass pipe that bypasses a side of the auxiliary heat exchanger where the refrigerant flows between the decompressor and the outdoor heat exchanger or a side where the refrigerant discharged from the compressor of the auxiliary heat exchanger flows, An air conditioner comprising: a first shutoff valve for closing a flow of a refrigerant to the auxiliary heat exchanger bypass pipe; and a second shutoff valve for closing a flow of a refrigerant to the auxiliary heat exchanger. 3. An air conditioner in which at least a compressor, a four-way valve for switching between a cooling operation and a heating operation, an outdoor heat exchanger and a decompressor, and an indoor unit including at least an indoor heat exchanger are pipe-connected. A single or mixed refrigerant containing no chlorine in the molecule is sealed, and the first check valve, the second check valve, the third check valve, the fourth check valve, the auxiliary heat exchanger, the auxiliary heat exchange The cooling device has a bypass pipe, a first shut-off valve, and a second shut-off valve. During the cooling operation, the refrigerant that has passed through the outdoor heat exchanger receives the first check valve, the auxiliary heat exchanger, the pressure reducer, and the third check. The refrigerant flows into the indoor heat exchanger through a valve, and the refrigerant that has passed through the indoor heat exchanger during the heating operation passes through the second check valve, the auxiliary heat exchanger, the pressure reducer, and the fourth check valve. Flows into the outdoor heat exchanger, and in the auxiliary heat exchanger, the first check valve or the second check valve. The refrigerant between the stop valve and the decompressor exchanges heat with the refrigerant discharged from the compressor, and the auxiliary heat exchanger bypass pipe is connected to the first check valve or the second check valve of the auxiliary heat exchanger. A first for bypassing a side where the refrigerant flows between the valve and the decompressor or a side where the refrigerant discharged from the compressor of the auxiliary heat exchanger flows and closing a flow of the refrigerant to the auxiliary heat exchanger bypass pipe; An air conditioner comprising: a closing valve; and a second closing valve for closing a flow of the refrigerant to the auxiliary heat exchanger.