JPH01312365A - Cooling and heating device - Google Patents

Abstract

PURPOSE:To enable an effect of coolant-coolant heat exchanger to be realized in both heating and cooling operations by a method wherein the coolant-coolant heat exchanger is connected between a coolant outlet of an indoor heat exchanger and a first coolant flow regulator and between a coolant outlet of an outdoor heat exchanger and a second coolant flow regulator device. CONSTITUTION:Coolant heat effects heat-exchange with coolant vapor of low temperature and low pressure flowed out of a coolant outlet 2b of an indoor heat exchanger 2 to become over-cooled liquid, flows through a connection port 8d of a second coolant flow regulator of a coolant-coolant heat exchanger 8 and a connection port 7b of a coolant-coolant heat exchanger of a second coolant flow regulator device 7, flows again into the second coolant flow regulator device 7, flows out of a connection port 7d of an expansion valve along a flowing direction of a check valve and then reaches the expansion valve 5. Then, the coolant pressure is reduced by an expansion valve 5 and then the coolant becomes a coolant of low temperature and low pressure. After this operation, the coolant passes through a connection port 6d of the expansion valve in the first coolant flow regulator device 6 and flows into the first coolant flow regulator device 6, passes through a connection port 6a of the indoor heat exchanger and a coolant inlet port 2a of the indoor heat exchanger 2 along a flowing direction of the check valve and flows into the indoor heat exchanger 2. It may absorb heat from indoor air 9, evaporate and gasified to perform a cooling operation.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a heating and cooling system having a vapor compression refrigerant circuit.

(Conventional technology) In recent years, air-conditioning equipment that uses a heat pump cycle has been
It has established its position due to improved functionality through cycle control using inverters and microprocessors, as well as excellent safety and cleanliness.

Increasing the capacity of the heat exchanger, countercurrent flow, and employing a non-azeotropic mixed refrigerant have been considered as measures to improve the functionality and efficiency of these heat pump cycles.

That is, by increasing the capacity of the heat exchanger, the temperature difference between the air and the refrigerant can be reduced. In addition, by using a non-azeotropic refrigerant mixture and performing countercurrent heat exchange, it is possible to match the temperature gradients of the air and refrigerant, thereby reducing the temperature difference between the air and refrigerant and reducing the compression ratio. It is possible to improve the functionality and efficiency of the heat pump cycle.

On the other hand, in the heat pump cycle improved as described above, since the temperature difference between the air and the refrigerant is small, it is difficult to overheat the refrigerant in the evaporator and to subcool the refrigerant in the condenser.

In other words, if the superheat of the refrigerant evaporated in the evaporator is small,
Even a small disturbance would cause the refrigerant to no longer be overheated, and the refrigerant, including liquid refrigerant, would be sucked into the compressor and compressed, producing abnormal noises and sometimes even destroying the compressor. In addition, if the subcooling of the refrigerant condensed in the condenser is small, refrigerant bubbles will occur in the liquid refrigerant due to pressure loss in piping, etc., and the pressure reduction effect in pressure reducers such as expansion valves and capillary tubes will become unstable. . For this reason, the refrigerant flow rate, evaporation temperature, and superheating of the refrigerant are not constant, which is one of the causes of degrading the performance of the heat pump cycle.

Therefore, there is a method to superheat the refrigerant by increasing the pressure reduction in the expansion valve and lowering the evaporation temperature, but this is not a good method because it is the same as using an evaporator with poor performance. There are also methods to obtain supercooling of the refrigerant by charging more refrigerant than necessary or reducing the condenser air volume to increase the condensing temperature, but these methods are good as they are the same as using a condenser with poor performance. isn't it.

Conventionally, when it is difficult to obtain superheat at the refrigerant outlet of the evaporator in a heat pump cycle, a refrigerant-refrigerant heat exchanger is used to transfer the high-temperature, high-pressure refrigerant from the refrigerant discharge port of the compressor to the expansion valve and the evaporator. A method has been considered to exchange heat with a low-temperature, low-pressure refrigerant from the refrigerant outlet of the refrigerant to the refrigerant inlet of the compressor to obtain the degree of superheat of the refrigerant sucked into the compressor. In addition, if it is difficult to achieve supercooling at the refrigerant outlet of the condenser, a refrigerant-refrigerant heat exchanger may be used to maintain the low temperature from the expansion valve to the refrigerant inlet of the compressor.
A method has been considered to exchange heat between a low-pressure refrigerant and a high-temperature, high-pressure refrigerant from the refrigerant outlet of the condenser to the expansion valve to obtain the degree of subcooling of the refrigerant population at the expansion valve. Furthermore, if it is difficult to obtain both superheating and supercooling, a refrigerant-refrigerant heat exchanger may be used to transfer the low-temperature, low-pressure refrigerant from the refrigerant outlet of the evaporator to the refrigerant inlet of the compressor, and the condenser. A method has been considered in which the degree of superheating of the refrigerant sucked into the compressor and the degree of subcooling at the refrigerant inlet of the expansion valve are obtained by exchanging heat with a high temperature, high pressure refrigerant from the refrigerant outlet to the expansion valve.

An example of a refrigerant circulation cycle is shown in FIG. A cycle without a refrigerant-refrigerant heat exchanger has the steps A-B-C-D, and a cycle with a refrigerant-refrigerant heat exchanger that obtains both superheating and supercooling has the steps A'-B'-C'. -Repeat process D'. The cycle process will be explained below.

The A-B stroke is the compression stroke in the compressor, the B-C stroke is the condensation stroke in the condenser, the C-D stroke is the pressure reduction stroke in the expansion valve, and the D-A stroke is the evaporation stroke in the evaporator. It represents the process. A
The '-B' stroke is the compression stroke in the compressor, the B'-C stroke is the condensation stroke in the condenser, the c-c' stroke is the supercooling stroke in the refrigerant-refrigerant heat exchanger, and C'- The D' stroke is the pressure reduction stroke in the expansion valve, the D'-A stroke is the evaporation stroke in the evaporator, and the A
The stroke -A' represents the superheating stroke in the refrigerant-refrigerant heat exchanger.

The evaporation enthalpy difference in the evaporator is D-A in a cycle without a refrigerant-refrigerant heat exchanger, whereas it is large as D'-A in a cycle with a refrigerant-refrigerant heat exchanger; If it is a flow rate, is the refrigerant-refrigerant heat exchanger better than a cycle without a refrigerant-refrigerant heat exchanger? #! A cycle equipped with a container has a larger refrigeration capacity. Similarly, the condensation enthalpy difference in the condenser is B-C in a cycle without a refrigerant-refrigerant heat exchanger, whereas it is as large as B'-C in a cycle with a refrigerant-refrigerant heat exchanger. For the same refrigerant circulation flow rate, a cycle equipped with a refrigerant-refrigerant heat exchanger has a larger heating capacity than a cycle not equipped with a refrigerant-refrigerant heat exchanger.

As described above, it can be seen that by obtaining sufficient superheating and subcooling using a refrigerant-refrigerant heat exchanger, the stability of the heat pump cycle is increased, and the refrigerating capacity and superheating capacity are also improved.

Therefore, the present inventors have already proposed a heat pump type air-conditioning device shown in FIG. Among the arrows in the figure, solid arrows indicate the flow of refrigerant during cooling, and dashed arrows indicate the flow of refrigerant during heating.

That is, the high temperature discharged from the compressor 51 during cooling operation,
The high-pressure refrigerant vapor enters the outdoor heat exchanger 53 via the electromagnetic four-way valve 52 and condenses by dissipating heat to the outdoor air, becoming a high-temperature, high-pressure liquid and entering the refrigerant-refrigerant heat exchanger 54.

Low-temperature, low-pressure refrigerant vapor that has absorbed heat from the indoor air and evaporated in the indoor heat exchanger 56 flows into the refrigerant-refrigerant heat exchanger 54, so that the refrigerant-refrigerant heat exchanger 54 performs outdoor heat exchange. The high-temperature, high-pressure liquid refrigerant from the container 53 radiates heat to the low-temperature, low-pressure refrigerant vapor from the indoor heat exchanger 56, becoming a sufficiently supercooled liquid refrigerant. This sufficiently supercooled liquid refrigerant enters the expansion valve 55, which is a pressure reducer, is depressurized, becomes low temperature and low pressure, and enters the indoor heat exchanger 56. In the indoor heat exchanger 56, it again absorbs heat from the indoor air and evaporates. It becomes a low-temperature, low-pressure refrigerant vapor. The low temperature, low pressure refrigerant vapor enters the refrigerant-refrigerant heat exchanger 54 again.

This refrigerant-refrigerant heat exchanger 54 includes the outdoor heat exchanger 5
3, the high-temperature, high-pressure liquid refrigerant that has radiated heat to the outdoor air and condensed is flowing into the refrigerant-refrigerant heat exchanger 54.
At this time, the low temperature, low pressure refrigerant vapor from the indoor heat exchanger 56 absorbs heat from the high temperature, high pressure liquid refrigerant from the outdoor heat exchanger 53, and becomes sufficiently superheated refrigerant vapor. This refrigerant vapor is sucked into the compressor 51 via the electromagnetic four-way valve 52, is compressed, and becomes high-temperature, high-pressure refrigerant vapor again. In this way, an efficient cycle is formed during cooling operation. In this case, the evaporator corresponds to the indoor heat exchanger 56, and the condenser corresponds to the outdoor heat exchanger 53.

On the other hand, during heating operation, the flow path of the electromagnetic four-way valve 52 is switched to be opposite to that during cooling operation, so the indoor heat exchanger 56 corresponds to the condenser, and the outdoor heat exchanger 53 corresponds to the evaporator. corresponds to

That is, high temperature, high pressure refrigerant vapor discharged from the compressor 51 enters the refrigerant-refrigerant heat exchanger 54 via the electromagnetic four-way valve 52. Since low-temperature, low-pressure refrigerant flows into this refrigerant-refrigerant heat exchanger 54 from an expansion valve 55 that is a pressure reducer, in this refrigerant-refrigerant heat exchanger 54, an electromagnetic four-way valve 5
The high-temperature, high-pressure refrigerant vapor from the expansion valve 55 radiates heat to the low-temperature, low-pressure refrigerant from the expansion valve 55 to reduce its enthalpy before entering the indoor heat exchanger 56 . There, it radiates heat into the indoor air and condenses, becoming a high-temperature, high-pressure liquid refrigerant.

This liquid refrigerant enters an expansion valve 55, which is a pressure reducer, and is reduced in pressure, becomes low temperature and low pressure, and enters a refrigerant-refrigerant heat exchanger 54. Here, the low temperature, low pressure liquid refrigerant is supplied to the compressor 5.
It absorbs heat from the high-temperature, high-pressure refrigerant vapor discharged from 1, increases its enthalpy, and then enters the outdoor heat exchanger 53, where it absorbs heat from the outdoor air and evaporates to become low-temperature, low-pressure vapor, which is then passed through the electromagnetic four-way valve 52. The air is sucked into the compressor 51 via.

Here, it is compressed and becomes high-temperature, high-pressure refrigerant vapor again. In this way, an inefficient cycle is formed during heating operation.

That is, to explain using Part 6, the evaporation enthalpy difference in the evaporator during heating operation is D-A in a cycle that does not include a refrigerant-refrigerant heat exchanger, whereas in a cycle that does not include a refrigerant-refrigerant heat exchanger, D'-A for cycles equipped with
And small. This means that if the refrigerant circulation flow rate is the same, the refrigerant -
This shows that the cycle equipped with a refrigerant-refrigerant heat exchanger has a smaller refrigerating capacity than the cycle without a refrigerant heat exchanger. Similarly, the condensation enthalpy difference in the condenser is B- for a cycle without a refrigerant-refrigerant heat exchanger.
C, whereas in a cycle equipped with a refrigerant-refrigerant heat exchanger, it is as small as B''-C.

This indicates that for the same refrigerant circulation flow rate, a cycle equipped with a refrigerant-refrigerant heat exchanger has a smaller heating capacity than a cycle not equipped with a refrigerant-refrigerant heat exchanger. The reason for this is that in the refrigerant-refrigerant heat exchanger, the stroke B-
This is because the B "refrigerant" and the stroke D-D" refrigerant exchange wasteful heat with each other that cannot be extracted as output, thereby reducing the difference in evaporation enthalpy in the evaporator and the difference in condensation enthalpy in the condenser.

(Problems to be Solved by the Invention) As described above, by obtaining sufficient superheating and subcooling using a refrigerant-refrigerant heat exchanger, the stability of the heat pump cycle is not only increased, but also the cooling capacity and heating capacity are increased. However, in devices that perform both heating and cooling by switching the refrigerant flow path using an electromagnetic four-way valve,
There was a problem in that the effect could only be obtained for either heating or cooling.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a heating and cooling device that can exhibit the effects of a refrigerant-refrigerant heat exchanger for both heating and cooling.

(Means for Solving the Problems) A heating and cooling device of the present invention includes a refrigerant circuit including a compressor, an indoor heat exchanger, an outdoor heat exchanger, and an expansion valve, and the refrigerant circuit includes the indoor heat exchanger. a first refrigerant rectifier in which the flow direction of the refrigerant flowing through the outdoor heat exchanger is a constant direction; a second refrigerant rectifier in which the flow direction of the refrigerant flowing in the outdoor heat exchanger is a constant direction; and a refrigerant flowing out from the indoor heat exchanger. and a refrigerant-refrigerant heat exchanger for exchanging heat between the refrigerant and the refrigerant flowing out from the outdoor heat exchanger, and the refrigerant-refrigerant heat exchanger connects the refrigerant outlet of the indoor heat exchanger and the first refrigerant rectifier. and between the refrigerant outlet of the outdoor heat exchanger and the second refrigerant rectifier.

(Function) As shown in FIG. 1, during cooling operation, the refrigerant discharged from the compressor 1 passes through the electromagnetic four-way valve 4 and then flows into the second refrigerant rectifier 7, as shown by the solid arrow. , the flow direction is limited by the second refrigerant rectifying device 7 and the outdoor heat exchanger 3
The refrigerant flows into the outdoor heat exchanger 3 from the refrigerant population 3a. Then, after flowing out from the refrigerant outlet 3b of the outdoor heat exchanger 3 and passing through the refrigerant-refrigerant heat exchanger 8, the flow direction is again limited by the second refrigerant rectifying device 7, and passing through the second refrigerant rectifying device 7. After that, it reaches the expansion valve 5. Then, the refrigerant flowing out from the expansion valve 5 flows into the first refrigerant rectifying device 6, and the flow direction is limited by the first refrigerant rectifying device 6, and the refrigerant flows into the indoor heat exchanger 2 from the refrigerant population 2a of the indoor heat exchanger 2. do. Then, after flowing out from the refrigerant outlet 2b of the indoor heat exchanger 2 and passing through the refrigerant-refrigerant heat exchanger 8, the flow direction is again limited by the first refrigerant rectifying device 6, and passing through the first refrigerant rectifying device 6. After that, it passes through the electromagnetic four-way valve 4 and returns to compression m1 again.

In addition, during heating operation, the refrigerant discharged from the compressor 1 passes through the electromagnetic four-way valve 4 and then into the first
- The refrigerant flows into the refrigerant rectifying device 6, the flow direction is limited by the first refrigerant rectifying device 6, and the refrigerant exit 2b of the indoor heat exchanger 2
After passing through the refrigerant-refrigerant heat exchanger 8 , the flow direction is again limited by the first refrigerant rectifier 6 , and the refrigerant flows through the first refrigerant rectifier 6 to the post-expansion valve 5 . Then, the refrigerant flowing out from the expansion valve 5 flows into the second refrigerant rectifying device 7, where the flow direction is limited by the second refrigerant rectifying device 6, and the refrigerant flows into the indoor heat exchanger 2 from the refrigerant population 3a of the outdoor heat exchanger 3. do. Then, the refrigerant flows out from the refrigerant outlet 3b of the outdoor heat exchanger 3, passes through the refrigerant-refrigerant heat exchanger 8, and then returns to the second refrigerant.
The flow direction of the refrigerant is limited by the refrigerant rectifier 7, and after passing through the second refrigerant rectifier 7, the refrigerant passes through the electromagnetic four-way valve 4 and returns to the compressor l.

As described above, the flow direction of the refrigerant in the indoor heat exchanger 2 is kept constant regardless of cooling or heating by the first refrigerant rectifier 6, and the refrigerant flows out from the refrigerant outlet 2b. Further, the flow direction of the refrigerant in the outdoor heat exchanger 3 is also kept constant regardless of cooling or heating by the second refrigerant rectifier 7, and the refrigerant flows out from the refrigerant outlet 3b. That is, in either case of heating or cooling, the refrigerant flowing out from the indoor heat exchanger 2 and the outdoor heat exchanger 3 can be heat-exchanged by the refrigerant-refrigerant heat exchanger 8.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

[First Embodiment] FIG. 1 is a system configuration diagram of a heating and cooling device showing an embodiment of the present invention.

In the figure, this device includes a compressor 1, an indoor heat exchanger 2,
Outdoor heat exchanger 3, electromagnetic four-way valve 4, expansion valve 5, first refrigerant rectifier 6, second refrigerant rectifier 7, refrigerant-refrigerant heat exchanger 8
It consists of

The discharge port and suction port of the compressor 1 are connected to the compressor connection port 6C of the first refrigerant rectifier 6 and the compressor connection lower C of the second refrigerant rectifier 7 via the electromagnetic four-way valve 4. Also,
The expansion valve connection port 6d of the first refrigerant rectifier 6 and the expansion valve connection lower d of the second refrigerant rectifier 7 are connected via the expansion valve 5. First refrigerant rectifier 6 and second refrigerant rectifier 7
are each composed of four check valves 6e, 6f, 6g, 6h, and 7e, 7f, 7g, 7h. and,
The indoor heat exchanger connection port 6a of the first refrigerant rectifier 6 is connected to the refrigerant population 2a of the indoor heat exchanger 2, and the refrigerant outlet 2b of the indoor heat exchanger 2 is connected to the indoor heat exchanger of the refrigerant-refrigerant heat exchanger 8. The first refrigerant rectifier connection port 8b of the refrigerant-refrigerant heat exchanger 8 is connected to the refrigerant-refrigerant heat exchanger connection port 6b of the first refrigerant rectifier 6. In addition, the outdoor heat exchanger connection lower a of the second refrigerant rectifier 7 is connected to the outdoor heat exchanger 3.
The refrigerant outlet 3b of the outdoor heat exchanger 3 is connected to the outdoor heat exchanger connection port 8C of the refrigerant-refrigerant heat exchanger 8.
The second refrigerant rectifier connection port 8d of the refrigerant-refrigerant heat exchanger 8 is connected to the refrigerant-refrigerant heat exchanger connection port 7b of the second refrigerant rectifier 7.

In FIG. 1, wavy arrows 9 of the indoor heat exchanger 2 indicate the flow of indoor air, and wavy arrows 10 of the outdoor heat exchanger 3 indicate the flow of outdoor air.

Further, the flow of refrigerant during cooling operation is shown by solid line arrows, and the flow of refrigerant during heating operation is shown by broken line arrows.

Next, the operation of the heating and cooling device will be explained. During cooling operation,
The high-temperature, high-pressure refrigerant vapor discharged from the compressor 1 passes through the electromagnetic four-way valve 4 (solid arrow), passes through the compressor connection lower C of the second refrigerant rectifier 7, and flows into the second refrigerant rectifier 7. It flows out from the outdoor heat exchanger connection lower a according to the flow direction of the check valve. Then, the refrigerant flows into the outdoor heat exchanger 3 through the refrigerant population 3a of the outdoor heat exchanger 3, radiates heat to the outdoor air 10, and is condensed and liquefied. After this, the refrigerant flows out from the refrigerant outlet 3b, and the refrigerant -
The refrigerant flows into the refrigerant-refrigerant heat exchanger 8 through the outdoor heat exchanger connection port 8C of the refrigerant heat exchanger 8. Here, it exchanges heat with the low-temperature, low-pressure refrigerant vapor flowing out from the refrigerant outlet 2b of the indoor heat exchanger 2, and becomes a supercooled liquid, which is then transferred to the second refrigerant rectifier connection port 8d of the refrigerant-refrigerant heat exchanger 8, and the 2 Refrigerant rectifier 7
The refrigerant flows into the second refrigerant rectifier 7 again through the refrigerant-refrigerant heat exchanger connection port 7b, flows out from the expansion valve connection lower d according to the flow direction of the check valve, and reaches the expansion valve 5. The refrigerant is then expanded under reduced pressure in the expansion valve 5 to become a low-temperature, low-pressure refrigerant.

After that, the refrigerant flows into the first refrigerant rectifier 6 through the expansion valve connection port 6d of the first refrigerant rectifier 6, and flows into the indoor heat exchanger connection port 6a and the indoor heat exchanger 2 according to the flow direction of the check valve. The refrigerant flows into the indoor heat exchanger 2 through the refrigerant population 2a, and the indoor air 9
It absorbs heat from the air, evaporates, and evaporates to provide cooling. Through this heat exchange, the refrigerant turns into low-temperature, low-pressure vapor, and the refrigerant exits the refrigerant outlet 2.
b, and flows into the refrigerant-refrigerant heat exchanger 8 through the indoor heat exchanger connection port 8a of the refrigerant-refrigerant heat exchanger 8.

Here, it exchanges heat with the high-temperature, high-pressure liquefied refrigerant flowing out from the refrigerant outlet 3b of the outdoor heat exchanger 3, and turns into superheated vapor, and the first refrigerant rectifier connection port 8b of the refrigerant-refrigerant heat exchanger 8,
and the refrigerant-refrigerant heat exchanger connection port 6 of the first refrigerant rectifier 6
b and flows into the first refrigerant rectifying device 6 again. The refrigerant then flows out from the compressor connection port 6C of the first refrigerant rectifier 6 according to the flow direction of the check valve, passes through the electromagnetic four-way valve 4, and then flows into the compressor 1.
is inhaled and compressed again. This cycle is repeated during cooling operation.

On the other hand, during heating operation, the electromagnetic four-way valve 4 is connected as shown in the broken line, similar to conventional air-conditioning equipment, and the refrigerant is condensed and liquefied in the indoor heat exchanger 2, and evaporated and vaporized in the outdoor heat exchanger 3.
By the action of the first refrigerant rectifier 6 and the second refrigerant rectifier 7, the flow direction of the refrigerant in the indoor heat exchanger 2 and the outdoor heat exchanger 3,
The outlet of the refrigerant is the same as in the above-mentioned cooling operation.

As shown above, the flow direction of the refrigerant in the indoor heat exchanger 2 is kept constant regardless of cooling or heating by the first refrigerant rectifier 6, and the refrigerant flows out from the refrigerant outlet 2b. Furthermore, the flow direction of the refrigerant in the outdoor heat exchanger 3 is also made constant regardless of cooling or heating by the second refrigerant rectifier 7.
The refrigerant will flow out from the refrigerant outlet 3b. In this way, for both heating and cooling, the indoor heat exchanger 2,
And the refrigerant flowing out from the outdoor heat exchanger 3 can be heat-exchanged by the refrigerant-refrigerant heat exchanger 8.

[Second Example] This example is shown in FIG. In this embodiment, the indoor heat exchanger 2 is used instead of the refrigerant-refrigerant heat exchanger 8 of the first embodiment.
A heating and cooling system using a double-back type heat exchanger 81 in which the refrigerant outlet pipe of the outdoor heat exchanger 3 is installed inside the refrigerant outlet pipe,
The other configurations and operations are the same as those of the air conditioning system of the first embodiment.

[Third Example] This example is shown in FIG. In this embodiment, instead of the refrigerant-refrigerant heat exchanger 8 of the first embodiment, the outdoor heat exchanger 3 is used.
This is an air-conditioning system using a double-back type heat exchanger 82 in which the refrigerant outlet pipe of the indoor heat exchanger 2 is installed inside the refrigerant exit pipe of the indoor heat exchanger 2, and the other configuration and operation are the same as the air-conditioning system of the first embodiment. It is similar to

[Fourth Example] This example is shown in FIG. In this embodiment, instead of the refrigerant-refrigerant heat exchanger 8 of the first embodiment, a closed container containing a heat medium 11 is used to connect the refrigerant outlet pipe of the indoor heat exchanger 2 and the refrigerant of the outdoor heat exchanger 3. Heat exchanger 8 with outlet pipe inside
The other configurations and operations are the same as those of the air conditioning apparatus of the first embodiment.

(Effects of the Invention) As is clear from the above description, a heating and cooling system that performs both heating and cooling by switching the refrigerant flow path using an electromagnetic four-way valve etc. includes a refrigerant-refrigerant heat exchanger and a first refrigerant rectifier. By providing the second refrigerant rectifier, it is possible to obtain sufficient superheating and subcooling regardless of heating or cooling, thereby increasing the stability of the heat pump cycle and improving the refrigerating capacity and heating capacity. be able to.

[Brief explanation of the drawing]

1 to 4 show drawings of the present invention, in which FIG. 1 is a system configuration diagram showing the air conditioning system of the first embodiment, FIG. 2 is a system configuration diagram showing the air conditioning system of the second embodiment, and FIG. Figure 3 is a system configuration diagram showing the air conditioning system of the third embodiment;
Figure 5 is a system configuration diagram showing the air conditioning system of the fourth embodiment, Figure 5 is a system configuration diagram showing a conventional air conditioning system using a refrigerant-refrigerant heat exchanger, and Figure 6 is a graph showing the refrigerant circulation cycle. be. ■...Compressor 2...Indoor heat exchanger 3
...Outdoor heat exchanger 4...Solenoid four-way valve 5...
- Expansion valve 6 - - First refrigerant rectifier 7 - Second refrigerant rectifier 8 - Refrigerant-refrigerant heat exchanger 9 - Indoor air flow IO - Outdoor air flow

Claims (1)

[Claims] 1) A refrigerant circuit having a compressor, an indoor heat exchanger, an outdoor heat exchanger, and an expansion valve, the refrigerant circuit having a first refrigerant having a constant flow direction of the refrigerant flowing through the indoor heat exchanger. a rectifier, a second refrigerant rectifier that makes the flow direction of the refrigerant flowing through the outdoor heat exchanger constant, and a refrigerant flowing out from the indoor heat exchanger and a refrigerant flowing out from the outdoor heat exchanger for heat exchange. A refrigerant-refrigerant heat exchanger is provided,
The refrigerant-refrigerant heat exchanger is connected between the refrigerant outlet of the indoor heat exchanger and the first refrigerant rectifier, and between the refrigerant outlet of the outdoor heat exchanger and the second refrigerant rectifier. A heating and cooling device characterized by: