JP2000274879A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an air conditioner in which the number of paths of an indoor heat exchanger can be selected optimally in each operating mode of cooling operation, dehumidification operation and heating operation by switching a plurality of on/off valves. SOLUTION: The air conditioner comprises a freezing cycle formed by coupling a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, and split indoor heat exchangers 5a, 5b sequentially by way of piping 12. The first indoor heat exchanger 5a is provided at the cooling inlet thereof with a first on/off valve 6, and the second indoor heat exchanger 5b is provided at the cooling outlet thereof with a second on/off valve 8. A refrigerant channel is branched from between the first on/off valve 6 and the first indoor heat exchanger 5a, and coupled between the second on/off valve 8 and the second indoor heat exchanger 5b. A third on/off valve 7 is provided on the refrigerant channel and the number of paths of the indoor heat exchanger is determined optimally for each operating mode of cooling operation, dehumidification operation and heating operation through selection control of first, second and third on/off valves.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control of a refrigerant flow path in an air conditioner.

[0002]

2. Description of the Related Art A conventional air conditioner is disclosed in
-82567. As shown in FIGS. 12 and 13, this air conditioner is divided into two parts, a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a decompressor 4, and an indoor heat exchanger 5. The refrigeration cycle includes an indoor heat exchanger 5a, a second indoor heat exchanger 5b, and an on-off valve 6, and these are connected by piping to circulate a refrigerant.

This air conditioner is provided with an on-off valve 6 connected to the indoor heat exchanger 5a. During normal cooling operation, as shown in FIG. 12, the on-off valve 6 is opened to divide the refrigerant flow path into two. The first indoor heat exchanger 5a and the other second indoor heat exchanger 5b have a high output in a two-pass state including both flow paths. On the other hand, during the dehumidifying operation, the indoor heat exchanger 5
When the operation is performed using the entirety of a and 5b, the capacity is too large and the room temperature is too low together with dehumidification. Therefore, as shown in FIG. The output is prevented so that the decrease in room temperature is suppressed.

[0004]

As described above, the ratio of the use of the indoor heat exchanger 5 is changed by opening and closing the on-off valve 6 according to the operation mode, and the ratio is reduced during the dehumidifying operation to prevent an excessive decrease in room temperature. Can be suppressed. On the other hand, the optimal number of passes differs between cooling and heating, and it is usually efficient to perform one pass with a high refrigerant flow rate during the heating operation and two passes with a low refrigerant flow rate during the cooling operation. That is, in the heating operation, the entire indoor heat exchanger 5, that is, the first indoor heat exchanger 5 a and the second indoor heat exchanger 5
Of the first indoor heat exchanger 5a and the second indoor heat exchanger 5b in cooling operation.
High efficiency is obtained when used in parallel as paths.

[0005] However, in the above-described prior art, the cooling operation can be performed in two passes of the indoor heat exchanger 5a and the indoor heat exchanger 5b. However, in the heating operation in which the flow direction of the refrigerant is reversed, the same as the cooling operation Either a two-pass operation or an operation in which the refrigerant flows only into the indoor heat exchanger 5b, which is the second heat exchanger that is a part of the indoor heat exchanger as in the dehumidifying operation, is possible, and high-efficiency operation is possible. In addition, the entire indoor heat exchanger cannot be operated as one pass, that is, the first indoor heat exchanger 5a and the second indoor heat exchanger 5b are connected in series.

The present invention not only selects the optimal number of passes of the indoor heat exchanger during the cooling operation and the dehumidifying operation, but also optimizes the number of passes during the heating operation, that is, the entire indoor heat exchanger during the heating operation. It is an object of the present invention to provide an air conditioner that can be operated as one pass.

[0007]

An air conditioner according to claim 1 of the present invention comprises a compressor, a four-way valve, an outdoor heat exchanger,
A first refrigerating cycle comprising a decompressor and an indoor heat exchanger sequentially connected via a pipe, wherein a refrigerant flow path of the indoor heat exchanger is a first indoor heat exchanger that forms an indoor heat exchanger from the pipe; In the air conditioner divided into the second indoor heat exchanger and branched, the first indoor heat exchanger is provided with a first opening / closing valve at a cooling inlet, and the second indoor heat exchanger is cooled. A second on-off valve at the time outlet, one branching off from between the first on-off valve and the first indoor heat exchanger, and the other branching off from the second on-off valve and the second indoor heat exchanger And a third on-off valve is installed on this flow path. By selectively controlling these first to third on-off valves, each of cooling, dehumidifying, and heating is controlled. In operation mode,
It is characterized in that an optimum refrigerant circuit shape can be selected.

An air conditioner according to a second aspect of the present invention is the air conditioner according to the first aspect, wherein the first air conditioner is operated during a cooling operation.
Opening and closing the third on-off valve and the third on-off valve to obtain the number of passes of the indoor heat exchanger capable of performing the cooling operation with high efficiency. Things.

An air conditioner according to a third aspect of the present invention is the air conditioner according to the first aspect, wherein the second air conditioner is operated during the dehumidifying operation.
Opening and closing the first and third on-off valves, thereby halving the cooling capacity and obtaining the number of passes of the indoor heat exchanger capable of preventing an excessive decrease in room temperature. It is assumed that.

An air conditioner according to a fourth aspect of the present invention is the air conditioner of the first aspect, wherein the third air conditioner is operated during the heating operation.
The number of passes of the indoor heat exchanger capable of performing the heating operation with high efficiency is obtained by opening the on-off valve and closing the first and second on-off valves. .

An air conditioner according to a fifth aspect of the present invention is provided with a refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger are sequentially connected through piping. In the air conditioner, a refrigerant flow path of the indoor heat exchanger is divided from the pipe into a first indoor heat exchanger and a second indoor heat exchanger that constitute an indoor heat exchanger, and each of the first and second indoor heat exchangers is branched. A second four-way valve and a first on-off valve are provided on a refrigerant flow path between the first indoor heat exchanger and the second indoor heat exchanger, and the first on-off valve and the second The optimum refrigerant circuit shape can be selected in each of the cooling, dehumidification and heating operation modes by the four-way valve.

According to a sixth aspect of the present invention, in the air conditioner of the fifth aspect, the first on-off valve is opened, and the second four-way valve forms a refrigerant flow path in a cooling operation direction. By doing so, it is possible to select the number of passes of the indoor heat exchanger capable of operating with high efficiency during the cooling operation.

According to a seventh aspect of the present invention, in the air conditioner of the fifth aspect, the first on-off valve is closed, and the second four-way valve forms a refrigerant flow path in a cooling operation direction. By doing so, the cooling capacity is reduced by half during the dehumidifying operation, and the number of passes of the indoor heat exchanger capable of preventing an excessive decrease in room temperature is obtained.

According to an eighth aspect of the present invention, in the air conditioner of the fifth aspect, the first on-off valve is closed, and the second four-way valve forms a refrigerant flow path in the heating operation direction. By doing so, the number of passes of the indoor heat exchanger capable of operating with high efficiency during the heating operation is obtained.

An air conditioner according to a ninth aspect of the present invention includes a refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger are sequentially connected via piping. In the air conditioner, a refrigerant flow path of the indoor heat exchanger is divided from the pipe into a first indoor heat exchanger and a second indoor heat exchanger that constitute an indoor heat exchanger, and each of the first and second indoor heat exchangers is branched. A second four-way valve and a first on-off valve installed on a refrigerant flow path between the first indoor heat exchanger and the second indoor heat exchanger, and a second indoor heat exchanger A second decompressor is additionally provided on the refrigerant flow path between the cooling outlet and the second four-way valve, and the first on-off valve, the second four-way valve, and the second decompressor provide cooling.・ The optimum refrigerant circuit shape can be selected in each operation mode of dehumidification and heating. Is shall.

According to a tenth aspect of the present invention, in the air conditioner according to the ninth aspect, the first on-off valve is closed, and the second four-way valve is set in the cooling operation direction. The indoor heat exchanger of No. 2 is provided with a reheating function as a condenser, so that a lowering of the room temperature during the dehumidifying operation can be further suppressed.

An air conditioner according to an eleventh aspect of the present invention is the air conditioner according to the ninth aspect, wherein the first and second air conditioners are different from each other.
The reheat amount of the second indoor heat exchanger is controlled by operating both of the decompressors, and the control range of the cooling capacity and the dehumidifying capacity can be expanded during the dehumidifying operation. It is.

An air conditioner according to a twelfth aspect of the present invention includes a refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger are sequentially connected via piping. In the air conditioner, the refrigerant flow path of the indoor heat exchanger is divided from the pipe into a first indoor heat exchanger and a second indoor heat exchanger that constitute the indoor heat exchanger, and each of the air conditioners is branched and connected. A second four-way valve and a first four-way valve on a refrigerant flow path between the first indoor heat exchanger and the second indoor heat exchanger.
And a second flow path connecting the compressor outlet and the cooling air outlet of the outdoor heat exchanger, and a fourth flow control valve installed on the refrigerant flow path. To allow the outdoor heat exchanger to be bypassed,
In each of the cooling, dehumidifying, heating, and defrosting operation modes, an optimum refrigerant circuit shape enabling more efficient operation can be selected.

An air conditioner according to a thirteenth aspect of the present invention is the air conditioner according to the twelfth aspect, wherein the first and fourth on-off valves are closed, and the first and second pressure reducers are controlled. The reheat amount of the second indoor heat exchanger is controlled so that the control range of the cooling capacity and the dehumidifying capacity can be expanded during the reheating dehumidifying operation.

An air conditioner according to a fourteenth aspect of the present invention is the air conditioner according to the twelfth aspect, wherein the first on-off valve is closed and the fourth on-off valve is opened to restart the indoor heat exchanger. The amount of heat is increased so that the room temperature can be further controlled during the reheat dehumidification operation while maintaining the dehumidification amount.

An air conditioner according to a fifteenth aspect of the present invention is the air conditioner of the twelfth aspect, wherein the first on-off valve is closed to open the fourth on-off valve, and the first four-way valve is opened. By setting the valve in the heating operation direction, the defrosting operation time can be reduced during the defrosting operation.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIGS. 1 to 3 each show a refrigerant circuit diagram of an air conditioner according to Embodiment 1 of the present invention. In each of these drawings, the air conditioner includes a compressor 1 and a four-way valve 2 for switching the piping between a cooling operation and a heating operation via a pipe 12 which is a main refrigerant flow path. , An outdoor heat exchanger 3, a decompressor 4, and an indoor heat exchanger 5 are sequentially connected to each other, thereby forming a refrigeration cycle. That is, during the cooling operation, the outdoor heat exchanger 3 → the decompressor 4 → the indoor heat exchanger 5
→ The refrigerant flows to the compressor 1, and during the heating operation, the refrigerant flows to the indoor heat exchanger 5 → the decompressor 4 → the outdoor heat exchanger 3 → the compressor 1.

The indoor heat exchanger 5 is divided into a first indoor heat exchanger 5a and a second indoor heat exchanger 5b, each of which is branched and connected. A first opening / closing valve 6 is provided at the cooling-time inlet, and a second opening / closing valve 8 is provided at the cooling-time outlet of the second indoor heat exchanger 5b, one of which is the first opening / closing valve 6 and the first. A refrigerant flow path that is branched from between the indoor heat exchanger 5a and the other is disposed between the second on-off valve and the second indoor heat exchanger 5b,
The third on-off valve 7 is provided on the refrigerant flow path.

By selectively controlling the first on-off valve 6, the second on-off valve 8, and the third on-off valve 7, the optimum indoor heat exchanger is provided in each of the cooling, dehumidifying and heating operation modes. And a refrigerant circuit for obtaining the number of passes.

First, in FIG. 1, the first on-off valve 6 and the second on-off valve 8 are opened, and the third on-off valve 7 is controlled to a closed state. In this state, during the cooling operation, the refrigerant that has left the compressor 1 passes through the four-way valve 2 and is condensed in the outdoor heat exchanger 3.
Next, after the pressure is reduced by the decompressor 4, a part is evaporated by the first indoor heat exchanger 5 a via the on-off valve 6 and returns to the compressor 1, and the rest is evaporated by the second indoor heat exchanger 5 b. The flow returns to the compressor 1 via the on-off valve 8. The on-off valve 7 is closed.
Therefore, the two divided indoor heat exchangers 5a and 5b are connected in parallel to the flow of the refrigerant. By opening the on-off valves 6 and 8 and closing the on-off valve 7 as described above, the indoor heat exchangers 5a and 5b are placed in parallel during cooling operation, that is, in a two-pass state, and the cooling is performed with high efficiency. Driving can be realized.

During the dehumidifying operation, as shown in FIG. 2, the first on-off valve 6 and the third on-off valve 7 are closed, and the second on-off valve 8 is controlled to be open. In this state, the refrigerant that has passed through the decompressor 4 flows only into the second indoor heat exchanger 5b and evaporates, and does not flow into the first indoor heat exchanger 5a. Therefore, the cooling capacity is reduced by half, and it is possible to prevent an excessive decrease in room temperature.

Further, during the heating operation, as shown in FIG. 3, the four-way valve 2 is rotated to reverse the flow direction of the refrigerant, and the first on-off valve 6 and the second on-off valve 8 are closed.
The third on-off valve 7 is controlled to be open. In this state, the refrigerant that has left the compressor 1 passes through the four-way valve 2 and then flows to the first indoor heat exchanger 5a, and then passes through the third on-off valve 7 to the second indoor heat exchanger 5b. After passing through to the decompressor 4,
The compressor 1 is evaporated through the outdoor heat exchanger 3 and passed through the four-way valve 2.
Return to That is, the condensation of the refrigerant is performed by the first indoor heat exchanger 5.
a and the second indoor heat exchanger 5b are connected in series, so that the entire indoor heat exchanger is performed as one pass, and a highly efficient heating operation can be realized.

Embodiment 2 4 to 6 each show a refrigerant circuit diagram of an air conditioner according to Embodiment 2 of the present invention. In these figures, three on-off valves are replaced by one on-off valve and one four-way valve in the refrigerant circuit according to Embodiment 1 described above to achieve the same effect. That is, the refrigerant circuit according to the first embodiment described above is constituted by the on-off valve 6 and the second four-way valve 9 in place of the on-off valves 6, 7, and 8, while realizing lower cost and space saving. It is possible to achieve the same effect as. In the drawings, all components having the same numbers represent the same components as in the first embodiment.

First, in FIG. 4, during cooling operation, the on-off valve 6 is opened and the second four-way valve 9 is set in the direction shown in FIG. And evaporates in each of the streams, merges again, and returns to the compressor 1 via the first four-way valve 2. That is, similar to the first embodiment described above, the refrigerant circuit includes the indoor heat exchangers 5a and 5b.
Are in parallel, that is, in a two-pass state, and a cooling operation with high efficiency can be realized.

Further, during the dehumidifying operation, by closing the on-off valve 6 as shown in FIG. 5, the refrigerant having passed through the decompressor 4 flows only into the second indoor heat exchanger 5b and evaporates. It does not flow to the indoor heat exchanger 5a. Therefore, only half of the indoor heat exchanger 5, that is, only the second indoor heat exchanger 5b is used, similarly to the refrigerant circuit in the first embodiment, and the cooling capacity is halved to prevent an excessive decrease in room temperature. It becomes possible.

Further, during the heating operation, as shown in FIG. 6, the first four-way valve 2 is rotated to reverse the flow direction of the refrigerant, and the on-off valve 6 is closed to rotate the second four-way valve 9. Then, the flow direction of the refrigerant is changed. By this control operation, in the same manner as in the refrigerant circuit in the first embodiment described above, the refrigerant is condensed by connecting the entire indoor heat exchanger 5, that is, the first indoor heat exchanger 5a and the second indoor heat exchanger 5b in series. This is performed as one pass, and a highly efficient heating operation can be realized.

Embodiment 3 FIG. FIG. 7 is a refrigerant circuit diagram of an air conditioner according to Embodiment 3 of the present invention, showing a dehumidifying operation. This is obtained by further adding the second decompressor 10 to the configuration of the above-described second embodiment, and achieves an effect equal to or more than that of the refrigerant circuit of the fifth embodiment while realizing lower cost and space saving. Can be raised. Note that, in the drawings, all the components having the same reference numerals indicate the same components as those in FIGS. 4 to 6 described above.

First, during the dehumidifying operation, as shown in FIG. 7, the operations of the on-off valve 6 and the second four-way valve 9 are the same as those in the second embodiment.
Is equivalent to In this embodiment, the first decompressor 4
Is operated, and only the second decompressor 10 is operated. Therefore, the outdoor heat exchanger 3 and the second indoor heat exchanger 5b function as a condenser, and the first indoor heat exchanger 5a functions as an evaporator. That is, the indoor air is cooled and dehumidified by the first indoor heat exchanger 5a, and heated by the second indoor heat exchanger 5b, so that the dehumidifying operation of the refrigerant circuit in the first and second embodiments described above. It is possible to further suppress the decrease in room temperature. Further, in this embodiment, the decompressor 4 and the second decompressor 10 are both operated to reduce the pressure, thereby controlling the amount of reheating of the second indoor heat exchanger 5b, thereby increasing the control range of the cooling capacity and the dehumidifying capacity. It is possible to expand.

Next, the effect of the third embodiment will be described with reference to FIG.
This will be described with reference to FIG. The cooling capacity includes sensible heat and latent heat. Of these, the sensible heat reduces the room temperature, and the latent heat dehumidifies. In the graph shown in FIG. 8, the horizontal axis indicates the sensible heat component of the cooling capacity, and the vertical axis indicates the dehumidification amount corresponding to the latent heat component. In the normal cooling operation, as shown in FIG. 8, the operation is performed in a high sensible heat range, and dehumidification is performed to some extent. . In the air conditioner based on Embodiment 1 of the present invention, by using only a part of the indoor heat exchanger, the capability of the sensible heat is reduced to some extent.
Is controlled in a range as shown as “dehumidification operation in the first embodiment”. Although not shown, Embodiment 2
The air conditioners in are also in the same range.

As described above, since the air conditioner according to Embodiment 3 operates part of the indoor heat exchanger as a reheater, the cooling capacity for the sensible heat is greatly reduced while maintaining the dehumidification amount. In addition, by adjusting the pressure reducing function of the first pressure reducer 4 and the second pressure reducer 10, the reheat amount of the second indoor heat exchanger 5b can be controlled, and control over a wider range becomes possible. As shown in (1), the control range can be extended almost continuously from the control range in normal cooling.

Embodiment 4 FIG. 9 to 11 show a refrigerant circuit diagram of an air conditioner according to Embodiment 4 of the present invention. In these figures, a refrigerant channel connecting the compressor 1 outlet of the refrigerant circuit and the outdoor heat exchanger 3 cooling outlet in the above-described third embodiment is installed, and a fourth on-off valve 11 is installed on this channel. are doing. This fourth on-off valve 11
, The ON / OFF of the outdoor heat exchanger 3 can be freely selected, and it becomes possible to select a circuit pattern that enables more efficient operation of each of the cooling, dehumidifying, heating, and defrosting operations. . Note that during normal reheat dehumidification operation, FIG.
As shown in the figure, the fourth on-off valve 11 is closed, and the second indoor heat exchanger 5 is controlled by controlling the second decompressor 10.
The control range of the reheat amount in b can be further expanded.

In the reheat dehumidifying operation, the fourth on-off valve 11 is opened as shown in FIG. As a result, the refrigerant bypassing the outdoor heat exchanger 3 is supplied to the second indoor heat exchanger 5b.
Therefore, the amount of reheat of the second indoor heat exchanger 5b is larger than that in the operation in FIG. 9, the control range of the amount of reheat is expanded, and the dehumidification operation corresponding to a wider range is possible.

Further, at the time of the defrosting operation, the fourth on-off valve 11 is opened as shown in FIG. 11, and the high-temperature refrigerant discharged from the compressor 1 is used for defrosting the outdoor heat exchanger 3. This makes it possible to reduce the defrosting operation time.

It should be noted that Embodiments 1 to 1 of the present invention described above.
In 4, the amount of dehumidification can be controlled by controlling an open / close valve, a four-way valve, a compressor, and a control of a blower fan of an indoor / outdoor heat exchanger (not shown). Further, switching between the first pressure reducer and the second pressure reducer as described in the third embodiment, and the fourth pressure reducer as described in the fourth embodiment.
It is possible to change the control range of the reheat amount in the second indoor heat exchanger by controlling the on-off valve 11 and the second decompressor 10 in order to control the dehumidification amount by detecting the indoor humidity. Can be For example, a humidity detecting means is provided to calculate the required dehumidification amount, and in consideration of the required cooling capacity, both decompressors may be controlled, or even without directly detecting the humidity, the room temperature and the evaporation temperature of the refrigerant may be used. It is also possible to know the humidity indirectly, for example, by inferring the humidity. In any case, the present invention does not limit the means for detecting humidity.

[0040]

According to the first aspect of the present invention, cooling / cooling
In each operation mode of dehumidification and heating, it is possible to select an optimum refrigerant circuit shape.

According to the invention of claim 2, according to claim 1,
In this air conditioner, a cooling operation with high efficiency can be performed.

According to the invention described in claim 3, according to claim 1
It is possible to prevent an excessive decrease in room temperature during the dehumidifying operation in the air conditioner of the present invention.

According to the invention described in claim 4, according to claim 1
In this air conditioner, a heating operation with high efficiency becomes possible.

According to the fifth aspect of the present invention, the first aspect is provided.
The same effect as that of the air conditioner can be realized with lower cost and space saving.

According to the invention of claim 6, according to claim 5,
In this air conditioner, a cooling operation with high efficiency can be performed.

According to the invention of claim 7, according to claim 5,
It is possible to prevent an excessive decrease in room temperature during the dehumidifying operation in the air conditioner of the present invention.

According to the invention of claim 8, according to claim 5,
In this air conditioner, a heating operation with high efficiency becomes possible.

According to the ninth aspect of the present invention, the fifth aspect
In this air conditioner, each operation mode of cooling, dehumidification, and heating can be selected, and the control range of the dehumidification operation can be further expanded.

According to the tenth aspect of the invention, in the air conditioner of the ninth aspect, it is possible to further suppress the decrease in room temperature during the dehumidifying operation.

According to the eleventh aspect of the present invention, in the air conditioner of the ninth aspect, the control range of the cooling capacity and the dehumidifying capacity during the dehumidifying operation can be expanded.

According to the twelfth aspect of the present invention, in the air conditioner of the ninth aspect, the outdoor heat exchanger can be bypassed, and the cooling, dehumidifying, heating and defrosting operations can be performed with higher efficiency. It is possible to select a circuit pattern that can perform the operation.

According to the thirteenth aspect of the present invention, in the air conditioner of the twelfth aspect, the control range of the cooling capacity and the dehumidifying capacity during the reheating dehumidifying operation can be expanded.

According to the fourteenth aspect of the invention, in the air conditioner of the twelfth aspect, it is possible to further control the decrease in room temperature while maintaining the dehumidification amount during the reheating dehumidification operation.

According to the fifteenth aspect of the present invention, in the air conditioner of the twelfth aspect, the defrosting operation time can be reduced.

[Brief description of the drawings]

FIG. 1 is a selected refrigerant circuit diagram during a cooling operation in Embodiment 1 of the present invention.

FIG. 2 is a selected refrigerant circuit diagram during a dehumidifying operation in Embodiment 1 of the present invention.

FIG. 3 is a selected refrigerant circuit diagram during a heating operation in Embodiment 1 of the present invention.

FIG. 4 is a selected refrigerant circuit diagram during a cooling operation in Embodiment 2 of the present invention.

FIG. 5 is a selected refrigerant circuit diagram during a dehumidifying operation in Embodiment 2 of the present invention.

FIG. 6 is a selected refrigerant circuit diagram during a heating operation in Embodiment 2 of the present invention.

FIG. 7 is a selected refrigerant circuit diagram during a dehumidifying operation in Embodiment 3 of the present invention.

FIG. 8 is a graph showing an effect at the time of a dehumidification operation in Embodiment 3 of the present invention.

FIG. 9 is a selected refrigerant circuit diagram during a reheat dehumidifying operation according to Embodiment 4 of the present invention.

FIG. 10 is a selected refrigerant circuit diagram during a dehumidifying operation in Embodiment 4 of the present invention.

FIG. 11 is a refrigerant circuit diagram selected during a defrosting operation in Embodiment 4 of the present invention.

FIG. 12 is a refrigerant circuit diagram of a conventional air conditioner during cooling and heating operations.

FIG. 13 is a refrigerant circuit diagram of a conventional air conditioner during a dehumidifying operation.

[Explanation of symbols]

1 compressor, 2 four-way valve, 3 outdoor heat exchanger, 4
Decompressor, 5 indoor heat exchanger, 5a first indoor heat exchanger, 5b second indoor heat exchanger, 6 first on-off valve, 7 third on-off valve, 8 second on-off valve, 9
2nd four-way valve, 10 2nd decompressor, 11 4th on-off valve, 12 piping,

Claims (15)

[Claims] 1. A refrigerating cycle comprising a compressor, a four-way valve, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger sequentially connected via piping, wherein a refrigerant flow path of the indoor heat exchanger is connected to the piping. In the air conditioner, which is divided into a first indoor heat exchanger and a second indoor heat exchanger that constitute an indoor heat exchanger, and is branched and connected to the first indoor heat exchanger, the cooling indoor inlet of the first indoor heat exchanger A first opening / closing valve, and a second opening / closing valve at a cooling outlet of the second indoor heat exchanger, one of which is provided between the first opening / closing valve and the first indoor heat exchanger. A refrigerant flow path is provided between the second on-off valve and the second indoor heat exchanger, and a third on-off valve is installed on this flow path. By selectively controlling the third on-off valve, the indoor heat exchanger can be operated in accordance with the cooling, dehumidifying, and heating operation modes. An air conditioner characterized by forming a refrigerant flow path for obtaining the number of refrigerants. 2. A first indoor heat exchanger and a second indoor heat exchanger by opening a first on-off valve and a second on-off valve and closing a third on-off valve during a cooling operation. The air conditioner according to claim 1, wherein the air conditioners are formed in a two-pass state in parallel. 3. The use state of only the second indoor heat exchanger is formed by opening the second on-off valve and closing the first and third on-off valves during the dehumidifying operation. The air conditioner according to claim 1. 4. A first indoor heat exchanger and a second indoor heat exchanger are connected in series by opening a third on-off valve and closing the first and second on-off valves during a heating operation. The air conditioner according to claim 1, wherein the air conditioner is formed in a one-pass state. 5. A refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger are sequentially connected through piping, and a refrigerant flow path of the indoor heat exchanger is connected to the piping. In the air conditioner divided into a first indoor heat exchanger and a second indoor heat exchanger that constitute an indoor heat exchanger, and the first indoor heat exchanger and the second indoor heat exchanger A second four-way valve and a first on-off valve are provided on a refrigerant flow path between the first and second indoor heat exchangers, and the second four-way valve and the first on-off valve are selectively controlled to perform cooling. -An air conditioner characterized by forming a refrigerant passage for obtaining the number of passes of the indoor heat exchanger according to each operation mode of dehumidification and heating. 6. A first indoor heat exchanger and a second indoor heat exchanger by opening a first on-off valve during cooling operation and forming a refrigerant flow path in a second four-way valve in a cooling operation direction. 6. The apparatus according to claim 5, wherein the first and second devices are formed in a two-pass state in parallel.
The air conditioner according to item 1. 7. A method in which the first on-off valve is closed during the dehumidifying operation, and the second four-way valve is formed in the state of only the second indoor heat exchanger by forming a refrigerant flow path in the cooling operation direction. The air conditioner according to claim 5, characterized in that: 8. A first indoor heat exchanger and a second indoor heat exchanger by closing a first on-off valve during a heating operation and forming a refrigerant flow path in a second four-way valve in a heating operation direction. 6. The apparatus according to claim 5, wherein the first and second devices are formed in a one-pass state in series.
The air conditioner according to item 1. 9. A refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger are sequentially connected via piping, and a refrigerant flow path of the indoor heat exchanger is connected to the piping. In the air conditioner divided into a first indoor heat exchanger and a second indoor heat exchanger that constitute an indoor heat exchanger, and the first indoor heat exchanger and the second indoor heat exchanger A second four-way valve and a first on-off valve are provided on a refrigerant flow path between the second indoor heat exchanger and the second indoor heat exchanger, and a second four-way valve. A second decompressor is additionally provided on the refrigerant flow path between the two, and the first on-off valve, the second four-way valve, and the second decompressor are selectively controlled to perform cooling, dehumidification, and heating. Air characterized by forming a refrigerant passage for obtaining the number of passes of the indoor heat exchanger according to the operation mode Harmony machine. 10. The first on-off valve is closed during a dehumidifying operation,
The second indoor heat exchanger acts as a condenser by selecting the second four-way valve in the cooling operation direction and operating only the second pressure reducer without opening and operating the first pressure reducer. The air conditioner according to claim 9, wherein: 11. The method according to claim 1, wherein the first on-off valve is closed during the dehumidifying operation, the second four-way valve is selected in the cooling operation direction, and the first and second pressure reducers are operated together. 10. The air conditioner according to 9. 12. A refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger are sequentially connected through piping, and a refrigerant flow path of the indoor heat exchanger is connected to the piping. In the air conditioner divided into a first indoor heat exchanger and a second indoor heat exchanger that constitute an indoor heat exchanger, and the first indoor heat exchanger and the second indoor heat exchanger A second four-way valve, a first on-off valve, and a second decompressor are provided on a refrigerant flow path between the indoor heat exchanger and a compressor outlet and a cooling outlet of the outdoor heat exchanger. And a fourth opening / closing valve installed on the refrigerant flow path to enable bypass of the outdoor heat exchanger, and each operation mode of cooling / dehumidification / heating and defrosting Characterized by forming a refrigerant flow path to obtain the number of passes of the indoor heat exchanger according to the Air conditioner. 13. The first and fourth on-off valves are closed during the reheat dehumidification operation, and the first and second decompressors are controlled to control the second and third pressure reducing devices.
The air conditioner according to claim 12, wherein a reheat amount of the indoor heat exchanger is controlled. 14. The reheat dehumidifying operation according to claim 12, wherein the first on-off valve is closed and the fourth on-off valve is opened to increase the reheat amount of the indoor heat exchanger. Air conditioner. 15. The first on-off valve is closed during a defrosting operation,
The air conditioner according to claim 12, wherein the fourth on-off valve is opened, and the first four-way valve is set in the heating operation direction.