JPH08178393A - Air conditioning apparatus - Google Patents

Abstract

PURPOSE: To form a comfortable environment by functioning an outdoor heat exchanger and a first room heat exchanger as condenser and a second room heat exchanger as evaporator to accomplish a room temperature control and a room moisture control during the dehumidifying operation independently. CONSTITUTION: A radiation value of a second indoor heat exchanger 7 is kept constant and the number of revolutions of an outdoor fan 8 attached to an outdoor heat exchanger 3 or a first room fan 13 attached to a first room heat exchanger 5 or both the fans 8 and 13 are controlled so that the radiation value of the first room heat exchanger 5 is adjusted to control the room temperature. On the other hand, the number of revolutions of a second room fan 18 attached to the second room heat exchanger 7 or the degree of choking of a second expansion mechanism 6 by a fixed choking mechanism 15 or the both are controlled to change an evaporation temperature of a refrigerant within the second heat exchanger 7, causing a change in a dehumidification value thereby controlling a room moisture.

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 refrigeration cycle, and more particularly to an air conditioner capable of contributing to improvement of comfort during dehumidifying operation.

[0002]

2. Description of the Related Art Generally, in an air conditioner using a refrigerating cycle, it is possible to freely select three kinds of operation modes including a cooling operation, a heating operation and a dehumidifying operation.
Of these, the dehumidifying operation is basically executed in the weak cooling operation mode. Therefore, the indoor humidity can be reduced to a desired level, but the indoor temperature is also reduced, which makes it difficult to create a comfortable environment.

Therefore, in order to solve such a problem, as disclosed in Japanese Patent Application No. 4-331902,
The indoor heat exchanger is divided into a first indoor heat exchanger and a second indoor heat exchanger, and an expansion mechanism is provided between the first indoor heat exchanger and the second indoor heat exchanger during dehumidifying operation. The first indoor heat exchanger is inserted as a condenser similar to the outdoor heat exchanger, and the second indoor heat exchanger is used as an evaporator.
An air conditioner has been considered in which the dehumidifying operation can be performed while controlling the indoor temperature by controlling the heat radiation amount of the outdoor heat exchanger.

However, even in the air conditioner configured as described above, since the control of the room temperature and the control of the room humidity cannot be performed independently, there is a problem that a desired comfortable environment cannot be created. there were.

[0005]

As described above, in the conventional air conditioner using the refrigeration cycle, it is impossible to control the indoor temperature and the indoor humidity independently during the dehumidifying operation. However, there was a problem that it was difficult to create the desired comfortable indoor environment.

Therefore, an object of the present invention is to provide an air conditioner capable of independently controlling the indoor temperature and the indoor humidity during the dehumidifying operation and contributing to the formation of a more comfortable environment.

[0007]

In order to achieve the above object, in the air conditioner according to the first invention, a compressor, an outdoor heat exchanger, a first expansion mechanism, a first indoor heat exchanger, Second
Of the expansion mechanism, a refrigeration cycle including a second indoor heat exchanger, an outdoor fan attached to the outdoor heat exchanger, a first indoor fan attached to the first indoor heat exchanger,
A second indoor fan attached to the second indoor heat exchanger, the outdoor heat exchanger for the refrigerant discharged from the compressor during dehumidifying operation, the first expansion mechanism controlled to be fully open,
At least the outdoor fan and the second indoor fan to flow the first indoor heat exchanger, the second expansion mechanism, and the second indoor heat exchanger in this order, and adjust the indoor temperature and the indoor humidity to target values. And a control means for controlling the number of rotations.

In order to realize a finer grained control, the control means controls the rotation speed of the outdoor fan and the second indoor fan, as well as the rotation speed of the first indoor fan and the first indoor fan. It is preferable to control at least one of the degree of restriction of the expansion mechanism of No. 2.

In order to achieve the above object, in the air conditioner according to the second invention, a compressor, an outdoor heat exchanger,
A refrigeration cycle including a first expansion mechanism, a first indoor heat exchanger, a second expansion mechanism, and a second indoor heat exchanger, an outdoor fan attached to the outdoor heat exchanger, and the first Indoor fan attached to both the indoor heat exchanger and the second indoor heat exchanger, the refrigerant discharged from the compressor during dehumidifying operation, the outdoor heat exchanger, and the first controlled to be fully opened. No. 1 expansion mechanism, the first indoor heat exchanger, the second expansion mechanism, the second indoor heat exchanger, and at least the rotation of the outdoor fan to match the indoor temperature and the indoor humidity to the target values. Control means for controlling the number and the air flow rate ratio in contact with the first indoor heat exchanger and the second indoor heat exchanger.

The air flow rate ratio is controlled by the flow path for bringing the indoor air into contact with the first indoor heat exchanger or the second indoor heat exchanger.
This can be achieved by providing a flow passage cross-sectional area adjusting means in the flow passage for bringing the indoor air into contact with the indoor heat exchanger.

Further, in the air conditioner according to the first and second aspects of the present invention, in order to simplify the structure, the first
The expansion mechanism is composed of an expansion mechanism with a fixed throttle amount, a bypass circuit connected in parallel with the expansion mechanism, and a switching valve that is inserted into the bypass circuit and is controlled to open during dehumidification operation. It is preferable.

Similarly, the second expansion mechanism is an expansion mechanism with a fixed throttle amount, a bypass circuit connected in parallel with the expansion mechanism, and a bypass circuit inserted in the bypass circuit and controlled to be closed during dehumidifying operation. It is preferable to be composed of a switching valve.

[0013]

In the air conditioner according to the first aspect of the invention, during the dehumidifying operation, the refrigerant discharged from the compressor is the outdoor heat exchanger, the first expansion mechanism controlled to be fully open, the first indoor heat exchanger, The second expansion mechanism and the second indoor heat exchanger flow in this order. That is, in this case, the outdoor heat exchanger and the first indoor heat exchanger are condensers, and the second indoor heat exchanger is an evaporator.

Therefore, the control means controls the number of revolutions of the outdoor fan attached to the outdoor heat exchanger, the first indoor fan attached to the first indoor heat exchanger, or both fans to control the first fan. Since the heat radiation amount of the indoor heat exchanger can be changed and the heat absorption amount of the second indoor heat exchanger is constant, the indoor temperature can be adjusted by adjusting the heat radiation amount of the first indoor heat exchanger. You will have control.

On the other hand, by controlling the rotation speed of the second indoor fan attached to the second indoor heat exchanger or the throttling degree of the second expansion mechanism or both, the inside of the second indoor heat exchanger is controlled. Since the evaporation temperature of the refrigerant can be changed to change the dehumidification amount, the indoor humidity can also be controlled.

Also in the air conditioner according to the second aspect of the present invention, during the dehumidifying operation, the refrigerant discharged from the compressor is the outdoor heat exchanger, the first expansion mechanism controlled to be fully open, and the first indoor heat exchanger. , The second expansion mechanism, and then the second indoor heat exchanger. Also in this case, the outdoor heat exchanger and the first indoor heat exchanger are condensers, and the second indoor heat exchanger is an evaporator.

Therefore, in this case as well, the heat radiation amount of the first indoor heat exchanger is changed by controlling the rotation speed of the outdoor fan or the indoor fan or both fans attached to the outdoor heat exchanger by the control means. Since the heat absorption amount of the second indoor heat exchanger is constant,
The indoor temperature can be controlled by adjusting the heat radiation amount of the first indoor heat exchanger.

On the other hand, the second indoor heat exchange is controlled by controlling the air flow rate ratio in contact with the first indoor heat exchanger and the second indoor heat exchanger or the throttling degree of the second expansion mechanism or both. Since the dehumidifying amount can be changed by changing the evaporation temperature of the refrigerant in the container, the indoor humidity can also be controlled in the end.

[0019]

Embodiments will be described below with reference to the drawings. FIG. 1 shows a refrigeration cycle system of an air conditioner according to an embodiment of the present invention, here a refrigeration cycle system in a dehumidifying operation mode (cooling operation mode).

That is, reference numeral 1 in the figure shows a compressor driven by an inverter power supply. The refrigerant discharged from the compressor 1 is, for example, an electromagnetically driven four-way valve 2, an outdoor heat exchanger 3, a first expansion mechanism 4, a first indoor heat exchanger 5, a second expansion mechanism 6, It flows through the path of the second indoor heat exchanger 7, the 4-way valve 2, and the compressor 1. In the heating operation mode, the four-way valve 2 is switched and the refrigerant flows in the route opposite to the above.

The outdoor heat exchanger 3 is provided with an outdoor fan 8 for circulating and contacting the outside air with the heat exchanger, and a motor 9 for driving the outdoor fan 8. The first expansion mechanism 4 has a fixed throttle mechanism 10 set to a throttle degree that can cope with a cooling operation, a bypass circuit 11 connected in parallel to the fixed throttle mechanism 10, and the bypass circuit 11
It is composed of, for example, an electromagnetically driven first switching valve 12 which is inserted into the valve and is normally kept in a "closed" state.

The first indoor heat exchanger 5 has a first indoor fan 1 for circulating indoor air in contact with the heat exchanger 5.
3 and a motor 14 for driving the same are attached.

The second expansion mechanism 6 has a fixed throttle mechanism 15 whose throttle degree is set so that it can cope with dehumidifying operation, and a bypass circuit 1 connected in parallel to the fixed throttle mechanism 15.
6 and this bypass circuit 16 are always inserted and "open"
And a second switching valve 17 of an electromagnetic drive type which is held in a state.

Further, the second indoor heat exchanger 7 is provided with a second indoor fan 18 for circulating and contacting indoor air with the heat exchanger, and a motor 19 for driving the second indoor fan 18.

Here, the first and second indoor heat exchangers 5, 7
Is formed flat, for example, and the first and second indoor fans 13, 18 are formed by cross-flow fans.
Then, the first and second indoor heat exchangers 5 and 7, the first and second indoor fans 13 and 18, and the motors 14 and 19 are
As shown in FIG. 2, it is accommodated in one housing 20 and arranged as an indoor unit.

That is, the front wall of the housing 20 is formed with the suction port 21 for sucking indoor air, and the upper wall and the lower wall are respectively formed with the discharge ports 22 and 23. Then, the first indoor heat exchanger 5 and the first indoor fan 13 are arranged in the upper half position in the housing 20 with the heat exchanger positioned upstream, and the second indoor heat exchanger 5 and the first indoor fan 13 are arranged in the lower half position. The indoor heat exchanger 7 and the second indoor fan 18 are arranged with the heat exchanger located upstream. In reverse to the above, the first indoor heat exchanger 5 and the first indoor fan 13 are arranged on the lower side, and the second indoor heat exchanger 7 and the second indoor fan 18 are arranged on the upper side. You can also

In FIG. 2, reference numeral 24 denotes a flow in which the indoor air sucked from the suction port 21 as shown by solid arrows 25 and 26 in the drawing contacts the first indoor heat exchange 5, and the second indoor air. A fan casing that guides the flow in contact with the heat exchange 7 separately is shown, and 27 is a drain pan for collecting the water condensed on the outer surface of the second indoor heat exchange 7.

FIG. 3 shows a block diagram of a control device 31 incorporated in this air conditioner. The control device 31 includes a control device body 32 composed of a microprocessor or the like. The control device main body 32 outputs the indoor temperature sensor 34 when the operation mode designating signal, the target temperature signal, the target humidity signal, the operation start command signal, the operation stop command signal, etc. are given from the remote controller 33 that is operated at hand. Or while monitoring the output of the indoor temperature sensor 34 and the output of the indoor humidity sensor 35, the 4-way valve 2
Drive circuit 36, the drive circuit 37 of the first switching valve 12, the drive circuit 38 of the second switching valve 17, the drive circuit 3 of the compressor 1.
9, drive circuit 40 for outdoor fan 8, first indoor fan 1
Drive circuit 41 for the third indoor fan 18 and drive circuit 4 for the second indoor fan 18
2 is controlled as shown in an example described later.

Next, an operation example of the air conditioner configured as described above, here, an operation procedure of each part when the dehumidification operation mode is selected will be described with reference to FIGS. 4 and 5. First, the remote controller 33 selects the dehumidifying operation mode, sets the target temperature Ts and humidity Hs,
An operation start command is given to the control device main body 32 (step S1).

When this command is given, the control device main body 3
2 controls the drive circuit 36 to switch the four-way valve 2 to the dehumidifying operation mode side, that is, the state shown in FIG. 1 (step S
2) Next, the drive circuits 37 and 38 are controlled to control the first switching valve 12 to "open" and the second switching valve 17 to "close" (steps S3 and S4). By this control, the first expansion mechanism 4 is fully opened, and the second expansion mechanism 6 is in a state of being throttled by the fixed throttle mechanism 15 in a predetermined manner.

Next, the drive circuits 40, 41, 42 are controlled to start the outdoor fan 8, the first indoor fan 13, and the second indoor fan 18 at medium speeds respectively (step S5).
, S6, S7) and the drive circuit 39 is controlled to start the operation of the compressor 1 at a constant rotation speed (step S8).

When the compressor 1 is started in this way,
The refrigerant discharged from the compressor 1 is an outdoor heat exchanger 3, a first expansion mechanism 4 controlled to be fully open, a first indoor heat exchanger 5,
The fixed throttle mechanism 15 in the second expansion mechanism 6 and the second indoor heat exchanger 7 flow in this order. Therefore, the outdoor heat exchanger 3 and the first indoor heat exchanger 5 function as a condenser, and the second indoor heat exchanger 7 functions as an evaporator. As a result, the room temperature Ta settles to a value determined by the heat radiation amount of the first indoor heat exchanger 5 and the heat absorption amount of the second indoor heat exchanger 7. In principle, the heat absorption amount of the second indoor heat exchanger 7 is constant, so that the room temperature Ta is determined by the heat radiation amount of the first indoor heat exchanger 5. On the other hand, the dehumidification amount is determined by the evaporation temperature of the refrigerant in the second indoor heat exchanger 7.

In the controller body 32, the present room temperature Ta obtained by the room temperature sensor 34 and the set room temperature Ts.
Is compared (step S9). In this comparison, when the current room temperature Ta is higher than the set room temperature Ts by 0.5 ° C. or more, the drive circuit 40 is controlled to increase the rotation speed of the outdoor fan 8 and the drive circuit 41 is controlled to control the first indoor fan. The number of rotations of 13 is decreased (step S10,
S11). When this control is performed, the heat radiation amount of the outdoor heat exchange 3 increases and the heat radiation amount of the first indoor heat exchanger 5 decreases, so that the room temperature Ta lowers.

Further, in the comparison in step S9, when the current room temperature Ta is lower than the set room temperature Ts by 0.5 ° C. or more, the drive circuit 40 is controlled to decrease the rotation speed of the outdoor fan 8 and to drive the drive circuit 41. By controlling, the rotation speed of the first indoor fan 13 is increased (steps S12 and S1).
3). When this control is performed, the heat radiation amount of the outdoor heat exchanger 3 decreases and the heat radiation amount of the first indoor heat exchanger 5 increases, so that the room temperature Ta rises.

Therefore, the room temperature Ta is kept within the range of ± 0.5 ° C. with respect to the set room temperature Ts by the control of steps S10 to S13. On the other hand, in the controller 32, the present indoor humidity Ha obtained by the indoor humidity sensor 35 is compared with the set humidity Hs (step S14).

In this comparison, if the present indoor humidity Ha is higher than the set humidity Hs by 3% or more, the drive circuit 42
Is controlled to decrease the rotation speed of the second indoor fan 18 (step S15). When this control is performed, the pressure in the second indoor heat exchanger 5 decreases, so the evaporation temperature of the refrigerant decreases, and as a result, the amount of condensation on the surface of the heat exchanger, that is, the amount of dehumidification increases. Become.

In the comparison in step S14, if the current indoor humidity Ha is lower than the set humidity Hs by 3% or more, the drive circuit 42 is controlled to increase the rotation speed of the second indoor fan 18 ( Step S16). When this control is performed, the pressure in the second indoor heat exchanger 5 rises,
The evaporation temperature of the refrigerant rises, and as a result, the dehumidification amount decreases.

Therefore, the indoor humidity Ha is held within the range of ± 3% with respect to the set humidity Hs by the control of steps S15 and S16. FIG. 6 shows a Mollier diagram during the dehumidifying operation of this air conditioner. In the figure, 45 indicates a saturated liquid line of the refrigerant, and 46 indicates a refrigeration cycle. In the case of this example, the dehumidification amount is controlled by moving the horizontal line 47 indicating the refrigeration amount in the refrigeration cycle 46 up and down.

In the cooling operation mode, the four-way valve 2 is held in the same state as in FIG. 1 and the first switching valve 12 is "closed",
The second switching valve 17 is operated while being held "open". In the heating operation mode, the four-way valve 2 is switched so that the discharge port of the compressor 1 is connected to the second indoor heat exchanger 7, and the first switching valve 12 is "closed" and the second switching valve 12 is closed. The switching valve 17 is operated while being held "open".

As described above, in the air conditioner according to this embodiment, it is possible to control the indoor temperature and the indoor humidity independently during the dehumidifying operation. Therefore, a desired comfortable indoor environment can be easily created.

In the above embodiment, during the dehumidifying operation, the first
The indoor heat exchanger 5 and the second indoor heat exchanger 7 are operated by interposing the fixed throttling mechanism 15 having a fixed throttling degree, as shown in FIG. A second expansion mechanism 6a having a variable degree of throttling is interposed between the indoor heat exchanger 5 and the second indoor heat exchanger 7 of the second expansion mechanism 6a.
The dehumidification amount may be changed by controlling the degree of reduction and the rotation speed of the second indoor fan 18. For example, by decreasing the rotation speed of the second indoor fan 18 and increasing the degree of throttling of the second expansion mechanism 6a, the pressure in the second indoor heat exchanger 7 is reduced, and thus the second indoor heat exchanger 7 is reduced. By lowering the refrigerant evaporation temperature in the heat exchanger 7, the dehumidification amount can be increased.

FIG. 8 shows a Mollier diagram when the above control is performed during the dehumidifying operation. FIG. 9 shows a refrigeration cycle of an air conditioner according to yet another embodiment of the present invention, here a refrigeration cycle in a dehumidifying operation mode (cooling operation mode). In addition, in FIG.
The same functional parts as are indicated by the same reference numerals. Therefore, detailed description of the overlapping portions will be omitted.

The air conditioning apparatus according to this embodiment is greatly different from that shown in FIG. 1 in that the first indoor heat exchanger 5 is
Also, one indoor fan 51 is commonly provided for the second indoor heat exchanger 7, and a louver 52 for varying the flow passage cross-sectional area is provided on the upstream side of the first indoor heat exchanger 5. That is, the configuration of the control device 31a described later is different.

In FIG. 9, reference numeral 53 is a motor for driving the indoor fan 51, and 54 is a louver drive mechanism mainly composed of a step motor or the like for varying the opening angle of the louver 52.

Here, the first and second indoor heat exchangers 5, 7
Is formed flat, for example, and the indoor fan 51 is formed by a cross flow fan. And the first and second
Indoor heat exchangers 5 and 7, an indoor fan 51, and a motor 5
As shown in FIG. 10, 3 is accommodated in one housing 55 and arranged as an indoor unit.

That is, the front wall and the upper wall of the housing 55 are formed with suction ports 56 and 57 for sucking indoor air, and the lower wall is formed with a discharge port 58. The indoor fan 51 is arranged in the center of the housing 55, the first indoor heat exchanger 5 is arranged between the indoor fan 51 and the suction port 56, and the indoor fan 51 and the suction port are further arranged. The second indoor heat exchanger 7 is disposed between the first indoor heat exchanger 57 and the second indoor heat exchanger 7. At the boundary position between the first indoor heat exchanger 5 and the second indoor heat exchanger 7, the indoor air sucked through the suction port 56 as shown by the solid line 59 in the drawing is transferred to the first indoor heat exchanger. A partition for contacting only the air conditioner 5 to allow the air to flow therethrough, and allowing the indoor air sucked through the suction port 57 to contact only the second indoor heat exchanger 7 to flow through as shown by the solid line 60 in the figure. A wall 61 is provided. Then, the louver 5 described above is attached to the suction port 56.
2 are provided.

In FIG. 10, 62 is a fan casing, and 63 is a drain pan for collecting the water condensed on the outer surface of the second indoor heat exchanger 7. Figure 11
In the figure, a block diagram of a control device 31a incorporated in this air conditioner is shown.

The control device 31a differs from the control device shown in FIG. 3 in that the drive circuit 6 for driving the indoor fan 51 is different.
5 is provided and a drive circuit 66 for the louver 52 is provided. The control device main body 32 incorporated in the device 31a receives, for example, an operation mode designating signal, a target temperature signal, a target humidity signal, an operation start command signal from a remote controller 33 operated at hand.
When the operation stop command signal or the like is given, the indoor temperature sensor 3
4 or the output of the indoor temperature sensor 34 and the output of the indoor humidity sensor 35, each drive circuit is controlled as shown in an example described later.

Next, an operation example of the air conditioner configured as described above, and again an operation procedure of each part when the dehumidifying operation mode is selected will be described with reference to FIGS. 12 and 13.

First, the remote controller 33 selects the dehumidifying operation mode, sets the target temperature Ts and the target humidity Hs, and gives an operation start command to the controller 32 (step S21).

When this command is given, the control device main body 3
2 controls the drive circuit 36 to switch the 4-way valve 2 to the dehumidification operation mode side, that is, the state shown in FIG. 9 (step S
22) Next, the drive circuits 37 and 38 are controlled to control the first switching valve 12 to "open" and the second switching valve 17 to "close" (steps S23 and S24). By this control, the first expansion mechanism 4 is fully opened, and the second expansion mechanism 6 is in a state of being throttled to a predetermined value by the fixed throttle mechanism 15.

Next, the drive circuits 40 and 65 are controlled to start the outdoor fan 8 and the indoor fan 51 at medium speed (steps S25 and S26), and the drive circuit 39 is further controlled to keep the compressor 1 constant. The operation is started at the rotation speed (step S27).

When the compressor 1 is started in this way,
The refrigerant discharged from the compressor 1 is an outdoor heat exchanger 3, a first expansion mechanism 4 controlled to be fully opened, a first indoor heat exchanger 5,
The fixed expansion mechanism 15 and the second heat exchanger 7 in the second expansion mechanism 6 flow in this order. Therefore, the outdoor heat exchanger 3 and the first indoor heat exchanger 5 function as a condenser, and the second indoor heat exchanger 7 functions as an evaporator. As a result, the room temperature Ta settles to a value determined by the heat radiation amount of the first indoor heat exchanger 5 and the heat absorption amount of the second indoor heat exchanger 7. In principle, the heat absorption amount of the second indoor heat exchanger 7 is constant, so that the room temperature Ta is determined by the heat radiation amount of the first indoor heat exchanger 5. On the other hand, the dehumidification amount is determined by the second indoor heat exchanger 7
Determined by the refrigerant evaporation temperature at.

In the controller 32, the present room temperature Ta obtained by the room temperature sensor 34 and the set room temperature Ts.
Is compared with (step S28). In this comparison, when the current room temperature Ta is higher than the set room temperature Ts by 0.5 ° C. or more, the drive circuit 40 is controlled to increase the rotation speed of the outdoor fan 8 and the drive circuit 65 is controlled to rotate the indoor fan 51. Decrease the number (steps S29, S3
0). When such control is performed, the heat radiation amount of the outdoor heat exchanger 3 increases and the heat radiation amount of the first indoor heat exchanger 5 decreases, so that the room temperature Ta decreases.

Further, in the comparison in step S28, when the current room temperature Ta is lower than the set room temperature Ts by 0.5 ° C. or more, the drive circuit 40 is controlled to decrease the rotation speed of the outdoor fan 8 and to drive the drive circuit 65. Control and indoor fan 5
The number of rotations of 1 is increased (steps S31, S32). When such control is performed, the heat radiation amount of the outdoor heat exchanger 3 decreases and the heat radiation amount of the first indoor heat exchanger 5 increases, so that the room temperature Ta rises.

Therefore, the room temperature Ta is kept within the range of ± 0.5 ° C. with respect to the set room temperature Ts which is the target temperature by the control of steps S29 to S32. On the other hand, in the controller 32, the present indoor humidity Ha obtained by the indoor humidity sensor 35 is compared with the set humidity Hs (step S33).

In this comparison, if the present indoor humidity Ha is higher than the set humidity Hs by 3% or more, the drive circuit 66
To open the louver 52 one step (step S34).
Since the amount of air sucked by the indoor fan 51 is constant, when the above control is performed, the amount of air flowing in contact with the first indoor heat exchanger 5 increases and the amount of air flowing in contact with the second indoor heat exchanger 7 increases. The amount of air flowing is reduced. As a result, the pressure in the second indoor heat exchanger 7 decreases and the evaporation temperature of the refrigerant decreases, so that the amount of condensation on the surface of the heat exchanger, that is, the amount of dehumidification increases.

In the comparison in step S33, if the current indoor humidity Ha is lower than the set humidity Hs by 3% or more, the drive circuit 66 is controlled to close the louver 52 by one step (step S35). As a result, the first indoor heat exchanger 5
And the amount of air flowing in contact with the second indoor heat exchanger 7 decreases. For this reason, the pressure in the second indoor heat exchanger 7 rises and the evaporation temperature of the refrigerant rises, so that the amount of condensation on the surface of the heat exchanger, that is, the amount of dehumidification, decreases.

Therefore, the indoor humidity Ha is kept within ± 3% with respect to the set humidity Hs by the control of steps S34 and S35, and the effect similar to that of the above-mentioned embodiment is finally obtained. .

[0060]

As described above, according to the present invention,
It is possible to control the indoor temperature and the indoor humidity independently during the dehumidifying operation without inviting a complicated structure, and to create a desired comfortable indoor environment.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a refrigeration cycle system of an air conditioner according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a schematic configuration of an indoor unit in the same device.

FIG. 3 is a block configuration diagram of a control device incorporated in the same device.

FIG. 4 is a diagram showing an operation procedure of the apparatus in a dehumidifying operation mode.

FIG. 5 is a diagram showing an operation procedure in the dehumidifying operation mode of the device.

FIG. 6 is a Mollier diagram showing a refrigeration cycle in the dehumidifying operation mode of the device.

FIG. 7 is a diagram showing an example of a refrigeration cycle system of an air conditioner according to another embodiment of the present invention.

FIG. 8 is a Mollier diagram showing a refrigeration cycle in the dehumidifying operation mode of the device.

FIG. 9 is a diagram showing an example of a refrigeration cycle system of an air conditioner according to yet another embodiment of the present invention.

FIG. 10 is a sectional view showing a schematic configuration of an indoor unit in the same device.

FIG. 11 is a block configuration diagram of a control device incorporated in the same device.

FIG. 12 is a diagram showing an operation procedure in the dehumidifying operation mode of the device.

FIG. 13 is a diagram showing an operation procedure in the dehumidifying operation mode of the device.

[Explanation of symbols]

1 ... Compressor 2 ... 4-way valve 3 ... Outdoor heat exchanger 4 ... 1st expansion mechanism 5 ... 1st indoor heat exchanger 6, 6a ... 2nd
Expansion mechanism 7 ... second indoor heat exchanger 8 ... outdoor fan 9,14,19,51,53 ... motor 10,15 ... fixed throttle mechanism 11,16 ... bypass circuit 12,17 ... switching valve 13 ... first Indoor fan 18 ... Second indoor fan 20, 55 ... Housing 21, 56, 5
7 ... Suction port 31, 31a ... Control device 34 ... Indoor temperature sensor 35 ... Indoor humidity sensor 51 ... Indoor fan 52 ... Louver for air volume distribution

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Takeshi Mishima, 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa Kanagawa, Ltd. (72) Inventor, Yukinobu Takahashi, Shinsugita-cho, Isogo-ku, Yokohama, Kanagawa Formula company Toshiba Yokohama office (72) Inventor Ai Kurai 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa Stock company Toshiba Yokohama office

Claims (6)

[Claims] 1. A compressor, an outdoor heat exchanger, a first expansion mechanism,
A refrigeration cycle including a first indoor heat exchanger, a second expansion mechanism, and a second indoor heat exchanger, an outdoor fan attached to the outdoor heat exchanger, and the first indoor heat exchanger. A first indoor fan attached, a second indoor fan attached to the second indoor heat exchanger, and a refrigerant discharged from the compressor during dehumidification operation are controlled to the outdoor heat exchanger and fully open. The first expansion mechanism, the first indoor heat exchanger, the second expansion mechanism, and the second indoor heat exchanger that have been subjected to flow in this order, and at least the indoor temperature and the indoor humidity to match the target values. An air conditioner comprising: an outdoor fan and a control means for controlling the rotation speeds of the second indoor fan. 2. The control means, in addition to controlling the rotational speeds of the outdoor fan and the second indoor fan, at least one of the rotational speed of the first indoor fan and the throttling degree of the second expansion mechanism. The air conditioner according to claim 1, wherein the air conditioner is also controlled. 3. A compressor, an outdoor heat exchanger, a first expansion mechanism,
A refrigeration cycle including a first indoor heat exchanger, a second expansion mechanism, and a second indoor heat exchanger, an outdoor fan attached to the outdoor heat exchanger, and the first indoor heat exchanger. An indoor fan commonly attached to the second indoor heat exchanger,
The refrigerant discharged from the compressor during the dehumidifying operation is the outdoor heat exchanger, the first expansion mechanism controlled to be fully open, the first indoor heat exchanger, the second expansion mechanism, and the second expansion mechanism. At least the number of rotations of the outdoor fan and the air flow rate in contact with the first indoor heat exchanger and the second indoor heat exchanger so as to match the indoor temperature and the indoor humidity with the target values while flowing in the order of the indoor heat exchanger. An air conditioner comprising: a control unit that controls a ratio. 4. The control of the air flow rate ratio is provided in a flow path for bringing the indoor air into contact with the first indoor heat exchanger or a flow path for bringing the indoor air into contact with the second indoor heat exchanger. The air conditioner according to claim 3, which is performed by a flow passage cross-sectional area adjusting means. 5. The first expansion mechanism is an expansion mechanism with a fixed throttle amount, a bypass circuit connected in parallel to the expansion mechanism, and a bypass circuit inserted in the bypass circuit and controlled to be open during dehumidifying operation. The air conditioner according to claim 1 or 3, wherein the air conditioner comprises a switching valve. 6. The second expansion mechanism, an expansion mechanism with a fixed throttle amount, a bypass circuit connected in parallel with the expansion mechanism, and a bypass circuit inserted in the bypass circuit and controlled to be closed during dehumidification operation. The air conditioner according to claim 1 or 3, wherein the air conditioner comprises a switching valve.