JP2002089933A - Control device for air conditioner - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a control device for an air conditioner that can realize more comfortable dry operation according to the air conditioning state (indoor temperature, indoor relative humidity) on the indoor side during dry operation. . SOLUTION: In an air conditioner having a reheating type dehumidifying function having a reheater 6 and a cooler 7, an indoor temperature detected by an indoor temperature detecting means 16 and an indoor relative humidity detected by a humidity detecting means 17 are provided. Based on the humidity, the operation speed N of the indoor fan 10 and the operation frequency F of the compressor are determined by the indoor air volume determination control table 56 and the operation frequency determination control table 57, and the dry operation is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly to a control device for realizing a comfortable dry operation in an air conditioner having a reheating type dry operation function.

[0002]

2. Description of the Related Art In recent years, a high-performance type air conditioner equipped with a dehumidifying function has been increasingly commercialized as a home air conditioner in order to further enhance the comfort of a living environment. For example, Japanese Patent Application Laid-Open No. Hei 6-137712 discloses a means for improving the comfort of a living environment during dry driving.

That is, a heat pump type refrigeration cycle is constituted by a compressor, a four-way valve, an outdoor heat exchanger, a decompression device and an indoor heat exchanger, and the indoor heat exchanger is provided with a first heat exchanger (reheater). This is a cycle reheating dry system that includes a second heat exchanger (cooler) and communicates via an auxiliary expansion valve.

[0004] As another method, there is a heater reheating dry method in which a heating element such as an electric heater is provided on the lee side of an indoor heat exchanger. From the viewpoint of comfort and power consumption, the former cycle reheating dry method is mainly used.

However, compared to the heater reheat drying method, the cycle reheat drying method requires the first heat exchanger to be a reheater and the second heat exchanger to be a cooler during a dry operation. The cooling part of the indoor heat exchanger is smaller than that of the reheating dry method, the sensible heat capacity is less than that of normal cooling operation, and especially when the temperature difference between the indoor side and the outdoor side is large, intrusion load from the outdoor Since it becomes large, the desired indoor temperature and indoor relative humidity on the indoor side cannot be obtained, which makes comfortable driving in dry driving difficult.

As a countermeasure, the fan air volume of the outdoor heat exchanger is increased to lower the condensation temperature of the reheater on the indoor side to increase the sensible heat capacity. In order to reduce the condensing temperature of the refrigerant in the first heat exchanger by increasing the pressure, the means for controlling the operating speed of the compressor based on the indoor relative humidity has been used.

[0007]

However, in the conventional control, the operating speed of the indoor fan on the indoor side during the dry operation depends on the indoor air-conditioning state (indoor temperature, indoor relative humidity).
Regardless of the temperature, the low pressure of the refrigeration cycle drops when the room temperature is low or the relative humidity is low, and the indoor heat exchanger increases when the room temperature is high and humid because the heat exchange amount of the indoor heat exchanger increases. The degree of superheat in the cooler of the vessel becomes large, and as a result, there is a possibility that the latent heat capacity may be reduced, and problems such as condensation on the fan may occur.

The operating speed of the compressor is uniquely determined by the relative humidity. For example, when the room temperature is low even when the relative humidity is high, the compressor is operated at a high operating frequency, so that the low pressure of the refrigeration cycle is reduced. There is a problem that the heat exchanger on the cooler side freezes as a result.

When the room temperature is high even if the relative humidity is not high, the operation is performed at a low operation frequency, so that the dehumidifying performance is insufficient.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a control device for an air conditioner capable of realizing more comfortable dry operation.

[0011]

SUMMARY OF THE INVENTION The present invention provides an inverter-type compressor that varies the operating frequency, and a first heat exchanger and a second heat exchanger that act as reheaters and coolers, respectively, during dry operation. An indoor heat exchanger, an outdoor heat exchanger, a four-way valve, and an expansion valve are connected to each other to form a refrigeration cycle by being annularly connected by pipes, and a first heat exchanger and a second heat exchanger Between the heat exchanger, the pressure reducing device and the opening and closing means are connected and arranged in parallel using piping, so that the refrigerant flows through the opening and closing means during the cooling and heating operation, and through the pressure reducing device during the dry operation. In the air conditioner having the dehumidifying function of the reheating system, the indoor unit side is provided with indoor temperature detecting means for detecting the indoor temperature and humidity detecting means for detecting the indoor relative humidity, and the indoor temperature detecting means and Detected by humidity detection means Those having a defined air volume control table for controlling to determine the rotational speed of the indoor fan based on the indoor temperature and the indoor relative humidity.

With this configuration, it is possible to prevent dew condensation on the indoor fan during the dry operation, and to expand an operation range (a wide range of indoor temperature and indoor relative humidity) where the dry operation is possible.

In another aspect of the present invention, a specified operating frequency control table defined by indoor temperature and indoor relative humidity is provided, and the specified operating frequency control table is set based on the indoor temperature and indoor relative humidity detected during the dry operation. Based on the control.

With this configuration, a large dehumidifying capacity can be secured when the indoor air-conditioning state is a high-temperature, high-humidity, high-load state, and in a low-temperature, low-humidity, low-load state, the cooler can be prevented from freezing and the operation of the freeze protection control can be prevented.

Further, another invention of the present application is a control table in which the operating speed of the indoor air flow rate determining control table and the operating frequency of the operating frequency determining control table are set to a normal control table and a higher control value than the normal control table. A plurality of control tables are provided to select a control table in which the operation speed and the operation frequency are set to higher values until the preset time elapses from the start of the dry operation to perform the dry operation. The control table switching means is provided.

With this configuration, immediately after the start of the operation, the operation for increasing the dehumidifying capacity is performed, so that a more comfortable living space is realized at an early stage. By increasing the operating speed of the indoor fan, masking improves the actual hearing, and when air conditioning is stable, lowering the operating frequency of the compressor or the operating speed of the indoor fan can reduce input and reduce noise. .

Further, another invention of the present application is a control table in which the operating speed of the indoor air flow rate determining control table and the operating frequency of the operating frequency determining control table are set to a normal control table and to a higher value than the normal control table. A plurality of control tables are provided, and if a normal dehumidification is selected by a remote controller or the like, a control table set to a normal value is selected.If a strong dehumidification having a greater dehumidification capacity than a normal dehumidification is selected, a control table set to a higher value is selected. Then, a control table switching means for performing the dry operation is provided.

With this configuration, when the strong dehumidification mode is selected, the operation is performed on the table in which the indoor air flow and the operation frequency are set higher than those in the normal dehumidification mode, so that the dry operation for increasing the dehumidification amount can be performed.

Further, another invention of the present application is provided with a plurality of control tables and control table switching means in which the operating speed of the indoor air flow determining control table and the operating frequency of the operating frequency determining control table are set to different values. Things.

With this configuration, the normal dehumidification mode is
The dry operation in the quiet dehumidifying mode in which the operating sound is set to be low and the indoor air volume and the operating frequency set low can be performed.

In another aspect of the present invention, the operating speed of the indoor air flow rate determining control table, the operating frequency of the operating frequency determining control table, and the relative humidity for dividing each block of the control table are set to different values. And a plurality of control tables and control table switching means.

With this configuration, the normal dehumidification, strong dehumidification, etc., such as a dry operation aiming at an increase in the dehumidification amount and a lower relative humidity, and a dry operation aiming at a lower target humidity when the operation is stable can be performed.
Dry operation in which the target humidity setting is changed for each dehumidification mode such as silent dehumidification can be performed.

Another aspect of the present invention provides a dehumidification setting area provided with a plurality of dehumidification setting areas based on a difference between an indoor relative humidity detected by humidity detecting means and an indoor set humidity set by a remote controller or the like. A switching means is provided, and an indoor air volume determination control table and an operation frequency determination control table are provided corresponding to each of the dehumidification setting areas.

With this configuration, it is possible to perform a dry operation in which the humidity is controlled to the target indoor set humidity set by the user.

Further, another invention of the present application is directed to a method in which, even when the indoor temperature detected by the indoor temperature detecting means and the indoor relative humidity detected by the humidity detecting means change, a predetermined time elapses. The system is provided with a block transition determining means for prohibiting a transition from a block in which the operation frequency and the operation frequency of the operation frequency determination control table of the indoor air volume determination control table are selected to another block.

With this configuration, it is possible to prevent a frequent change in the amount of indoor air or the operating frequency, and to perform a dry operation that does not cause a user to feel uncomfortable.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a configuration diagram of a refrigeration cycle of the air conditioner of the present invention. In FIG. 1, reference numeral 1 denotes an inverter-type compressor that varies an operation frequency, and a four-way valve 2, an indoor heat exchanger 3, an expansion valve 4, and an outdoor heat exchanger 5 are sequentially connected to form a heat pump refrigeration cycle. are doing.

The indoor heat exchanger 3 is composed of a first heat exchanger (reheater) 6, a second heat exchanger (cooler) 7, an electromagnetic valve 8 and a capillary type pressure reducing device 9. The first heat exchanger 6 and the second heat exchanger 7 are communicated via an electromagnetic valve 8,
The capillary type pressure reducing device 9 is disposed in parallel with the solenoid valve 8.

An indoor fan 10 that ventilates the indoor heat exchanger 3 and an outdoor fan 11 that ventilates the outdoor heat exchanger 5 are provided.

Reference numeral 12 denotes a control unit which controls the rotation speeds of the indoor fan 10, the outdoor fan 11 and the compressor 1 together with the fan drive control circuits 13 and 14, and the inverter circuit 15, and controls the opening of the expansion valve 4. Further, an indoor temperature sensor 16 serving as an indoor temperature detecting means for detecting an indoor temperature near the indoor intake port of the air conditioner, and a humidity sensor 17 serving as an indoor humidity detecting means for detecting a relative humidity in the room are provided. It is connected.

As shown in FIG. 2, the controller 12 includes an operating frequency control means 53 for the compressor,
4. Valve opening determining means 55, indoor air flow determining control table 5
6, operating frequency determination control table 57, control table switching means 58, block shift determination means 59, dehumidification setting area switching means 60, etc. are provided. In addition, an input signal from a wireless remote controller 18 provided with an air conditioner operation stop unit, a temperature adjustment setting unit for setting an indoor temperature, and the like is received via a remote control signal receiving unit (not shown). Have been.

Next, the air conditioning operation of the air conditioner having the above configuration will be described with reference to FIG.

During the cooling operation, the solenoid valve 8 is controlled to the fully open state, and the refrigerant sucked and compressed by the compressor 1 is sent to the outdoor heat exchanger 5 through the four-way valve 2 and condensed and liquefied there. . The refrigerant that has exited the outdoor heat exchanger 5 is decompressed by the expansion valve 4 and guided to the first heat exchanger 6. The refrigerant having left the first heat exchanger 6 flows into the second heat exchanger 7 through the solenoid valve 8 in a fully opened state. In each of the heat exchangers 6 and 7, the refrigerant removes latent heat of evaporation from room air and evaporates. The refrigerant that has passed through the heat exchangers 6 and 7 is sucked into the compressor 1 again through the four-way valve 2.

On the other hand, during the heating operation, the solenoid valve 8 is controlled to the fully open state, and the four-way valve 2 is switched so that the flow is opposite to that of the cooling circuit. The refrigerant sucked and compressed by the compressor 1 is sent to the second heat exchanger 7 via the four-way valve 2. The refrigerant that has exited the second heat exchanger 7 flows into the first heat exchanger 6 through the electromagnetic valve 8 that is fully open. In each of the heat exchangers 6 and 7, the refrigerant condenses and releases condensation heat to indoor air to liquefy. The refrigerant that has passed through these heat exchangers 6 and 7 is decompressed by the expansion valve 4 and guided to the outdoor heat exchanger 5.
Here, the refrigerant takes vaporizing latent heat from the outdoor air and vaporizes, and is again sucked into the compressor 1 through the four-way valve 2.

During the dry operation, the solenoid valve 8 is controlled to a fully closed state, and the refrigerant sucked and compressed by the compressor 1 is sent to the outdoor heat exchanger 5 through the four-way valve 2 and further fully opened. It is led to the first heat exchanger 6 via the expansion valve 4 in the state. The refrigerant is the outdoor heat exchanger 5 and the first heat exchanger (reheater)
The condensed liquid is condensed and liquefied in 6 and, at this time, the first heat exchanger 6 releases the condensed heat to the indoor air. Since the solenoid valve 8 is closed, the liquid refrigerant is decompressed by the capillary type decompression device 9 and flows into the second heat exchanger (cooler) 7. This second heat exchanger 7
The refrigerant evaporates and takes the latent heat of evaporation from the indoor air to vaporize,
At this time, indoor humidity is reduced by dehumidifying from indoor air.
Then, the refrigerant that has exited the second heat exchanger 7 is sucked into the compressor 1 again through the four-way valve 2.

The second heat exchanger 7 functions as a cooler for dehumidifying and cooling the indoor air sucked from the suction port of the air conditioner, and the first heat exchanger 6 converts the dehumidified and cooled indoor air. It becomes a reheater for heating. That is, an air conditioner having a dehumidifying function of a so-called reheating system, which is blown out into a room as dry air to perform a dehumidifying function, is configured.

Next, an embodiment of the control device of the air conditioner having the above configuration will be described in detail.

(Embodiment 1) First, a first embodiment of the present invention will be described with reference to FIG.

At the time of the dry operation, an indoor air volume determination control table 56 for determining the air volume on the indoor side based on the indoor air-conditioning state is provided. That is, as shown in FIG.
7, the indoor relative humidity RH detected by step 7 is plotted on the horizontal axis, and the indoor relative humidity RH is less than 45%, 45% or more and less than 55%,
Divide into three categories of 55% or more. On the other hand, the indoor temperature sensor 1
The vertical axis represents the room temperature Ta detected in Step 6, and the room temperature Ta is divided into three sections of less than 22 ° C, 22 ° C or more and less than 26 ° C, or 26 ° C or more, and multiplied by three sections of relative humidity to obtain a total of 9 points. Set up two blocks. The operating speed N of the indoor fan 10 is set as a specified value in each block.

The operating speed N is set lower as the indoor relative humidity RH increases, and set lower as the indoor temperature Ta increases.

During the dry operation, the dry operation is performed based on the indoor air volume determination control table 56.

At this time, as the room relative humidity RH is higher and the room temperature Ta is higher, the second heat exchanger (cooler) 7 has a higher degree of superheat SH of the circulating refrigerant, so that the cooled air and the cooled air are cooled. The air that has passed through the indoor fan 10 is mixed when it passes through the indoor fan 10, where dew forms on the surface of the blades of the indoor fan 10 and may be blown out from the air outlet and dropped on the floor surface. Air conditioning condition (indoor temperature T
a, a low rotation speed is selected based on the indoor relative humidity RH), and the dry operation is performed. For example, RH = 70%, T
When a = 28 ° C., block 7 is selected and the number of rotations is 1
The indoor fan is controlled at 000 rpm.

Further, as the indoor relative humidity RH is lower and the indoor temperature Ta is lower, the evaporation temperature of the circulating refrigerant in the second heat exchanger (cooler) 7 is lower, so that the cooler 7 may be frozen. Since it is difficult to continue the operation, a low rotation speed is selected based on the indoor air-conditioning state (indoor temperature Ta, indoor relative humidity RH), and the dry operation is performed. For example, RH
= 30%, Ta = 19 ° C., block 3 is selected, and the indoor fan is controlled at a rotational speed of 1300 rpm.

As a result, the indoor fan 10 during the dry operation is
The dew condensation can be prevented, and the operation region (a wide range of room temperature Ta and room relative humidity RH) in which dry operation can be performed can be widened.

(Embodiment 2) Next, a second embodiment of the present invention will be described with reference to FIG.

An operation frequency determination control table 57 for determining the operation frequency F of the compressor 1 based on the indoor air-conditioning state during the dry operation is provided. That is, as shown in FIG. 4, the room relative humidity RH detected by the humidity sensor 17 is plotted on the horizontal axis, and the room relative humidity RH is less than 45%, 45% or more and 5% or more.
The room temperature Ta detected by the temperature sensor 16 is plotted on the vertical axis, and the room temperature Ta is lower than 22 ° C, 22 ° C or higher and lower than 26 ° C, or 26 ° C or higher. And nine blocks are set in the same manner as in the first embodiment. The operating frequency F of the compressor 1 is set as a specified value for each block. The operating frequency F is
The higher the indoor relative humidity RH, the higher the indoor temperature Ta.
Is set to be larger as is higher.

In the dry operation, the dry operation is performed based on the operation frequency determination control table 57.

At this time, high dehumidification performance (a large amount of dehumidification) is required under high load conditions where the room humidity RH is high and the room temperature Ta is high, so that the indoor air-conditioning state (room temperature Ta, room humidity RH) , A large operation frequency F is selected and the dry operation is performed. For example, RH = 70
%, When Ta = 28 ° C., the compressor is controlled at an operating frequency of 35 Hz.

The lower the room humidity RH and the lower the room temperature Ta, the lower the evaporation temperature of the circulating refrigerant in the second heat exchanger (cooler) 7 in the refrigeration cycle. Since there is a fear that the continuation of the operation becomes difficult, a small operation frequency F is selected based on the indoor air-conditioning state (the indoor temperature Ta and the indoor humidity RH), and the dry operation in which the evaporation temperature of the refrigerant in the cooler 7 is raised is performed. Will be implemented. For example, when RH = 40% and Ta = 20 ° C., the operating frequency is 18H.
z controls the compressor.

(Embodiment 3) Next, a third embodiment of the present invention will be described with reference to FIG.

During the dry operation, a plurality of tables (a1) and (a2) are provided for the indoor air volume determination control table 56 for determining the air volume on the indoor side based on the indoor air condition, and the compressor is operated based on the indoor air condition. A plurality of tables (b1) and (b2) are provided as an operation frequency determination control table 57 for determining one operation frequency. The table (a
1) is the same table as in the first embodiment, and is a table in which specified values during the dry operation are set. On the other hand, the table (a2) has a high room temperature Ta and a room relative humidity RH.
For the blocks having a higher value, the operating speed N of the indoor fan 10 is set to a value higher than the specified value in the table (a1). Similarly, the operating frequency determination control table 57
Table (b1) is the same as that in the above-described second embodiment, but the table (b2) also shows the operating frequency F of the compressor 1 for a block having a high room temperature Ta and a high room relative humidity RH. It is set to a value higher than the specified value of b1).

At the time of the dry operation, the table (a) is used based on the operation elapsed time t1 after the start of the dry operation.
One of 1), (a2), (b1), and (b2) is selected to perform the dry operation. Therefore, the operation elapsed time t
For example, when the number 1 is within 15 minutes, the tables (a2) and (b2) are selected, and after 15 minutes, the tables (a1) and (b1) of the specified values during the dry operation are selected and the dry operation is performed. You.

As a result, by switching between the indoor air volume determination control table 56 and the operation frequency determination control table 57 according to the elapsed operation time t1, the operation for increasing the dehumidifying capacity immediately after the start of operation is performed.
A more comfortable living space is realized at an early stage, and the noise of the refrigerant that may occur in the unstable state of the refrigeration cycle at the time of startup is masked by increasing the operating speed N of the indoor fan 10 and setting the air volume higher. To improve real listening,
When the air conditioning is stable after the operation elapsed time t1, the compressor 1
By lowering the operating frequency F and the operating rotational speed N of the indoor fan 10, low input and quiet operation can be realized.

In the above embodiment, the tables of the operating speed and the operating frequency are respectively (a2) → (a1),
Although the case where the same change is made from (b2) to (b1) is shown, control may be made so that only one of the operating speed and the operating frequency is changed. That is, in an air conditioner or the like using a constant speed compressor that cannot control the operating frequency, only the air volume control may be performed. (The same applies to Embodiments 4 to 8.) (Embodiment 4) Next, a fourth embodiment of the present invention will be described with reference to the flowchart of FIG.

Even if the indoor air-conditioning state (indoor temperature Ta, indoor relative humidity RH) changes, the predetermined time t2 elapses.
A block transition determining means 59 comprising a timer for inhibiting the transition from the selected block to the other block in which the operation speed N in the indoor air flow rate determination control table 56 and the operation frequency F in the operation frequency determination control table 57 are selected. Was provided.

In FIG. 6, the dry operation is started to detect the room temperature Ta and the room relative humidity RH (steps S1 to S3). Next, based on the above values, the indoor air volume determination control table 56 and the operating frequency determination control table 5
7, the block of the operating speed N and the operating frequency F is determined (step S4).

When the elapsed time t2 has passed a predetermined time (for example, 15 minutes) by the block shift determining means 59 (step S5), the room temperature Ta and the room relative humidity RH are newly detected again, and the values are changed. If it has been changed to a new block, the operation shifts to a new block and the dry operation is continued. The operation elapsed time t2 is a predetermined time (for example, 15
If it is within (minute), the operation is continued with the original operation speed N and the operation frequency F of the block.

As a result, frequent changes in the indoor air volume Qa or the operating frequency F can be prevented, and the dry operation can be performed without any discomfort for the user.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described with reference to FIG.

During the dry operation, a plurality of tables (a1) and (a3) are provided for the indoor air volume determination control 56 for determining the indoor air volume based on the indoor air condition, and the compressor 1 is controlled based on the indoor air condition. The operating frequency determination control table 57 for determining the operating frequency F of a plurality of tables (b)
1) and (b3) are provided. Here, table (a1),
(B1) is a table in which the prescribed values at the time of the dry operation described in the first and second embodiments are set, and a detailed description thereof will be omitted.

The table (a3) of the indoor air volume determination control table 56 indicates that the indoor fan 10
Is set to a value higher than the specified value in the table (a1). Similarly, the table (b3) of the operating frequency determination control table 57 sets the operating frequency F of the compressor 1 to a value higher than the specified value of the table (b1) for all blocks.

In the dry operation, if the normal dehumidification mode is selected by the remote controller 18 or the like, the normal dehumidification operation is performed based on the tables (a1) and (b1). If the strong dehumidification mode is selected, the tables (a3) and (b) are selected.
The dry operation in the strong dehumidification mode is performed based on 3).

When the strong dehumidification mode is selected, the table (a3) and / or the table (a3) in which the indoor air volume Qa and the operating frequency F are set to higher values than the normal dehumidification mode by the control table switching means 58. b3)
, It is possible to carry out a dry operation aiming at an increase in the amount of dehumidification.

Embodiment 6 Next, a sixth embodiment of the present invention will be described with reference to FIG.

At the time of the dry operation, a plurality of tables (a1) and (a4) are provided for the indoor air volume determination control 56 for determining the air volume on the indoor side based on the indoor air condition, and the compressor 1 is controlled based on the indoor air condition. The operating frequency determination control table 57 for determining the operating frequency F of a plurality of tables (b)
1) and (b4) are provided.

The table (a1) of the indoor air volume determination control table 56 is the same as that of the first embodiment,
In the table (a4), the operating speed N of the indoor fan 10 is set to a value lower than the specified value in the table (a1) for all blocks. Similarly, the table (b1) of the operating frequency determination control table 57 is the same as that of the second embodiment, but the table (b4) shows the operating frequency F of the compressor 1 for all blocks in the table (b1). Is set to a value lower than the specified value.

In the dry operation, if the normal dehumidifying mode is selected by a remote controller or the like, the normal dehumidifying operation is performed based on the table (a1) and the table (b1). If the silent dehumidifying mode is selected, the table (a4) and / or the table (a4) is selected. The dry operation in the silent dehumidification mode is performed based on (b4).

When the silent dehumidifying mode is selected, the table (a4) in which the indoor air volume Qa and the operating frequency F are set to be lower than those in the normal dehumidifying mode by the control table switching means 58, and / or the table (a4). (B
Since the operation is performed in 4), a dry operation with a quiet operation sound can be performed.

(Seventh Embodiment) Next, a seventh embodiment of the present invention will be described with reference to FIG.

During the dry operation, a plurality of tables (a1) and (a5) are provided for the indoor air volume determination control table 56 for determining the air volume on the indoor side based on the indoor air condition, and the compressor based on the indoor air condition. A plurality of tables (b1) and (b5) are provided as an operating frequency determination control table 57 for determining one operating frequency F.

The table (a1) of the indoor air volume determination control table 56 is the same as that of the first embodiment,
In the table (a5), the numerical value of each block is the same as that of the above-described fifth embodiment in which the operating speed N of the indoor fan 10 is set to a value higher than the specified value of the table (a2) for all blocks. There is a room relative humidity RH on the horizontal axis
The numerical value of the indoor relative humidity RH was set to a lower value as three categories of less than 40%, 40% or more and less than 45%, and 45% or more. Similarly, the table (b1) of the operating frequency determination control table 57 is the same as that of the second embodiment, but the table (b5) shows the operating frequency F of the compressor 1 for all blocks in the table (b1). Although the numerical value of each block is the same as that of the fifth embodiment described above, which is set to a value higher than the specified value, the indoor relative humidity RH on the horizontal axis
Is set to a lower value as the three categories of less than 40%, 40% or more and less than 45%, and 45% or more.

At the time of the dry operation, if the normal dehumidification mode is selected by the remote controller 18 or the like, the normal dehumidification operation is performed based on the table (a1) and the table (b1). The dry operation in the strong low-humidity dehumidification mode is performed based on (b5).

As a result, if the strong low humidity dehumidifying mode is selected, the indoor air volume Qa and the operating frequency F are increased by the control table switching means 58 with respect to the normal dehumidifying mode.
Table (a) in which the division of the indoor relative humidity RH is set lower
5) and the operation with the table (b5), it is possible to increase the dehumidification amount and to perform the dry operation aiming at a lower relative humidity.

Also, in the silent dehumidification mode described in the sixth embodiment, by setting the division of the indoor relative humidity RH to a lower value in the same manner as in the present embodiment, it is possible to aim at stable operation. Dry operation in which the humidity is set to a lower value can be performed.

Thus, the normal dehumidification mode and other dehumidification modes (strong dehumidification, silent dehumidification,
When the mode is switched to (strong low humidity dehumidification, etc.), the humidity setting targeted for each mode such as normal dehumidification, strong dehumidification, and silent dehumidification is changed by changing the data of the indoor relative humidity RH that separates the blocks for each dehumidification mode. The changed dry operation can be performed.

(Embodiment 8) Next, FIG. 10 and FIG.
An eighth embodiment of the present invention will be described with reference to FIG.

In the dry operation, a dehumidification setting area switching control table shown in FIG. 10 and a dehumidification setting area switching control means 60 for performing the dehumidification setting area switching control shown in FIG. 11 are provided. The dehumidification setting area switching control table includes a plurality of tables (a1) and (a6) including an indoor air volume determination control table 56 that determines the air volume on the indoor side based on the indoor air conditioning status, and a compressor based on the indoor air conditioning status. A plurality of tables (b1) and (b6) are provided as an operating frequency determination control table 57 for determining one operating frequency F.

The table (a1) of the indoor air volume determination control table 56 is the same as that of the first embodiment,
In the table (a6), the operating speed N of the indoor fan 10 is set to a value higher than the specified value in the table (a1) for all blocks. Similarly, the table (b1) of the operating frequency determination control table 57 is the same as that in the second embodiment, but the table (b6) shows the operating frequency F of the compressor 1 for all blocks in the table (b1). Is set to a value higher than the specified value.

As shown in FIG. 11, the difference ΔRH (= RH−RHs) between the room relative humidity RH detected by the humidity sensor 17 and the room set humidity RHs set by a remote controller or the like is obtained by the dehumidification setting area switching control. (%)), The difference ΔRH (relative humidity) is calculated, and the setting areas (A, B, compressor OFF) are switched in accordance with the value, and in the case of the setting areas A and B, respectively. The dry control is performed by referring to the control table of the set air volume and / or frequency.

Here, the algorithm for switching the setting area will be specifically described. Now, the relative humidity R in the room
H is 40%, RHs = 55% by remote control
Is set. When the air conditioner is operated in the dry operation, ΔRH is set to −15 by the dehumidification setting area switching means 60.
%, The process first moves to region 1, and the control is executed using the control table for the air volume or frequency corresponding to the setting region A. While the dry operation is being continued, the room relative humidity is RH = 8 with respect to the set relative humidity RHs = 55% due to disturbance such as opening and closing of the door of the room to be conditioned and rainfall.
If it is 0%, since ΔRH = 25%, the processing shifts to the area 2 and the control is executed using the air volume or frequency control table corresponding to the setting area B. At this time, the control table of the air volume or the frequency set in the setting area B is set such that the frequency is higher and the air volume is lower in the opposing block than the specified value of the air volume or the frequency control table of the setting area A. Preferably, it is set and controlled so that ΔRH = 0 more quickly. When the dry operation is performed in the setting area B as described above, and the indoor relative humidity decreases to RH = 65%, the area becomes the area 3 and the air volume and the frequency are controlled again by the table set in the setting area A again. Is done. Further, when the indoor relative humidity again becomes RH = 70% and ΔRH = 15%, it means that there is a transition from the setting area A to the setting area B.
The transition is from area 1 to area 2. Further, from the state where the setting area A is applied, the indoor relative humidity is further changed to RH.
= 40%, ΔRH = −15%,
It will enter region 4 and the compressor will be turned off.

As a result, a dry operation in which the indoor humidity RHs set by the user is controlled can be realized, the indoor humidity can be controlled as intended by the user, and more comfortable air conditioning can be performed.

In this embodiment, the indoor air volume determination control table 56, the operating frequency determination control table 57, and the relative humidity classification are described by setting specific numerical values.
This value varies depending on the performance, performance, and the like of the air conditioner, and is set experimentally.

In the normal dehumidification mode, the indoor air volume determination control table 56, the operation frequency determination control table 57, and the numerical values of the relative humidity classification are set so that the optimal dry operation is realized under standard temperature and humidity conditions during the rainy season. It is set experimentally.

[0085]

As is apparent from the above embodiment, the present invention relates to an air conditioner having a reheating type dehumidifying function, wherein an indoor temperature detecting means, a humidity detecting means, an indoor temperature and an indoor relative An indoor air flow rate determination control table defined by humidity is provided. Based on the indoor temperature detected by the indoor temperature detection means and the indoor relative humidity detected by the humidity detection means, the indoor fan is operated and rotated by the indoor air flow rate determination control table. By controlling the number, it is possible to prevent dew condensation on the indoor fan during the dry operation, and to expand the operation range (a wide range of indoor temperature and indoor relative humidity) where the dry operation is possible.

Further, according to the present invention, an indoor temperature detecting means, a humidity detecting means and an operation frequency determining control table defined by the indoor temperature and the indoor relative humidity are provided on the indoor side, and the indoor temperature detected by the indoor temperature detecting means is provided. And the operating frequency of the compressor is controlled by the operating frequency determination control table on the basis of the indoor relative humidity detected by the humidity detecting means. Capability can be ensured, and in a low load condition of low temperature and low humidity, freezing of the cooler can be prevented and operation of the freeze protection control can be prevented.

Further, according to the present invention, there are provided a plurality of control tables of a control table in which the operating speed of the indoor air flow determining control table and the operating frequency of the operating frequency determining control table are set to normal and higher values than normal. Until a preset time elapses from the start of the dry operation, a control table set to a higher value is selected so that the dry operation can be performed. In order to realize a more comfortable living space at an early stage, and to increase the operating speed of the indoor fan to increase the operating speed of the indoor fan, the sound of the refrigerant that may be generated in the refrigeration cycle unstable state at the time of startup is masked, and the actual listening feeling is realized. In addition, when the air conditioning is stabilized, the operating frequency of the compressor and the operating speed of the indoor fan are reduced, so that a low input and low noise can be realized.

Further, according to the present invention, even if the indoor temperature and the indoor relative humidity change on the indoor side, the operating rotation speed and the operating frequency determining control table of the indoor air flow rate determining control table are not changed until the set predetermined time elapses. By prohibiting the transition from the block where the operating frequency is selected to another block, frequent changes in the indoor air volume or the operating frequency are prevented, and dry operation is performed without user discomfort can do.

Further, according to the present invention, there are provided a plurality of control tables in which the operating speed of the indoor air flow rate determining control table and the operating frequency of the operating frequency determining control table are set to normal and higher values than normal. By providing a control table switching means for selecting a plurality of control tables, a dry operation in a powerful dehumidification mode for increasing the amount of dehumidification operated by selecting a control table set to a higher indoor air flow and operation frequency is performed. it can.

Further, the present invention provides a plurality of control tables in which the operating speed of the indoor air flow rate determining control table and the operating frequency of the operating frequency determining control table are set to different values, and the control table switching means. In contrast to the normal dehumidification mode, the dry operation in the silent dehumidification mode in which the operating air volume and the operation frequency are set to lower values and the operation sound is quiet can be performed.

Further, according to the present invention, a plurality of sets of different values are set for the operating speed of the indoor air flow rate determining control table, the operating frequency of the operating frequency determining control table, and the relative humidity for dividing each block of the control table. By providing the control table and the control table switching means, the normal dehumidification such as the dry operation aiming at the increase of the dehumidification amount and the lower relative humidity and the dry operation aiming at the lower humidity at the time of stable operation. In addition, a dry operation in which the target humidity setting is changed for each dehumidification mode such as strong dehumidification and silent dehumidification can be performed.

Further, the present invention provides a dehumidification setting area switching means having a plurality of dehumidification setting areas based on the difference between the indoor humidity detected by the humidity sensor and the indoor setting humidity set by a remote controller or the like. By providing the indoor air volume determination control table and the operating frequency determination control table corresponding to each of the dehumidification setting areas, it is possible to perform a dry operation in which the target indoor set humidity set by the user is controlled.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a refrigeration cycle of an air conditioner of the present invention.

FIG. 2 is a control block diagram showing an embodiment of the present invention.

FIG. 3 is an explanatory diagram of an indoor air volume determination control table according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram of an operation frequency determination control table according to a second embodiment of the present invention.

FIG. 5 is an explanatory diagram of a control table for switching control according to a third embodiment of the present invention.

FIG. 6 is a flowchart of a block shift determining unit according to a fourth embodiment of the present invention.

FIG. 7 is an explanatory diagram of a control table in a strong dehumidification mode according to a fifth embodiment of the present invention.

FIG. 8 is an explanatory diagram of a control table in a silent dehumidification mode according to a sixth embodiment of the present invention.

FIG. 9 is an explanatory diagram of a control table in a strong low-humidity dehumidifying mode according to a seventh embodiment of the present invention.

FIG. 10 is an explanatory diagram of a control table for dehumidification setting area switching control according to an eighth embodiment of the present invention.

FIG. 11 is a characteristic diagram showing dehumidification setting area switching control according to an eighth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Indoor heat exchanger 4 Expansion valve 5 Outdoor heat exchanger 6 First heat exchanger 7 Second heat exchanger 8 Solenoid valve 9 Decompression device 10 Indoor fan 11 Outdoor fan 12 Controller 13 Drive Control circuit 14 Drive control circuit 15 Inverter circuit 16 Indoor temperature sensor 17 Humidity sensor 53 Compressor operation frequency control means 54 Indoor air flow control means 55 Valve opening determination means 56 Indoor air flow determination control table 57 Operating frequency determination control table 58 Control table switching Means 59 Block shift determination means 60 Dehumidification setting area switching means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Teruo Fujisha 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 3L060 AA07 CC02 CC06 CC08 DD02 EE04 EE05

Claims (13)

[Claims] 1. An indoor heat exchanger comprising an inverter-type compressor that varies the operating frequency, and a first heat exchanger and a second heat exchanger that function as a reheater and a cooler, respectively, during a dry operation. And an outdoor heat exchanger, a four-way valve, and an expansion valve, which are connected to each other in a ring to form a refrigeration cycle, and that the first heat exchanger and the second heat exchanger In between, the pressure reducing device and the opening and closing means are connected and arranged in parallel using piping, and the reheating method is configured such that the refrigerant flows through the opening and closing means during the cooling and heating operation and the pressure reducing device during the dry operation. In the air conditioner having a dehumidifying function, the indoor unit side is detected by the indoor temperature detecting means for detecting the indoor temperature and the humidity detecting means for detecting the indoor relative humidity, and is detected by the indoor temperature detecting means and the humidity detecting means. Room temperature and And a prescribed air volume control table for determining and controlling the number of revolutions of the indoor fan based on the indoor relative humidity and the indoor relative humidity. 2. An indoor heat exchanger comprising an inverter-type compressor that varies the operating frequency, and a first heat exchanger and a second heat exchanger that serve as reheaters and coolers, respectively, during dry operation. And an outdoor heat exchanger, a four-way valve, and an expansion valve. The refrigeration cycle is constituted by annularly communicating with piping by a pipe, and the first heat exchanger and the second heat exchanger are connected to each other. In between, the pressure reducing device and the opening / closing means are connected and arranged in parallel by using a pipe, and the reheating method is configured such that the refrigerant flows through the opening / closing means during the cooling / heating operation and the pressure reducing device during the dry operation. In the air conditioner having a dehumidifying function, the indoor unit side is detected by the indoor temperature detecting means for detecting the indoor temperature and the humidity detecting means for detecting the indoor relative humidity, and is detected by the indoor temperature detecting means and the humidity detecting means. Room temperature and And a specified frequency control table for determining and controlling the operating frequency of the compressor based on the indoor relative humidity and the indoor relative humidity. 3. A first timer for counting a predetermined time from the start of the dry operation, and a plurality of dry operation start air volume control tables in which the operation speed is set to a higher value corresponding to the prescribed air volume control table. At the start of the dry operation, the first timer counts a predetermined time, and until the predetermined time has elapsed, performs the dry operation based on the dry operation start air volume control table. After the predetermined time, performs the dry operation based on the specified air volume control table. The control device for an air conditioner according to claim 1, wherein a dry operation is performed. 4. A second timer for counting a predetermined time from the start of the dry operation, and a plurality of dry operation start frequency control tables in which the compressor operation frequency is set to a lower value corresponding to the prescribed frequency control table. At the start of the dry operation, a predetermined time is counted by the second timer, and the dry operation is performed based on the dry operation start frequency control table until the predetermined time elapses. 3. The control device for an air conditioner according to claim 2, wherein the dry operation is performed by performing the dry operation. 5. An operation selecting means capable of selecting at least a normal dehumidifying operation and a powerful dehumidifying operation, and a plurality of strong dehumidifying operation air flow control tables in which the operation speed is set to a higher value corresponding to the prescribed air flow control table. When the normal dehumidification is selected by the operation selection means, the dry operation is performed based on the specified air volume control table, and when the strong dehumidification operation having a larger dehumidification capacity than the normal dehumidification is selected, the strong dehumidification operation is performed. The control device for an air conditioner according to any one of claims 1 and 3, wherein the dry operation is performed based on an air volume control table. 6. An operation selecting means which can select at least a normal dehumidifying operation and a strong dehumidifying operation, and a plurality of strong dehumidifying operation frequency control tables in which an operation frequency is set to a higher value corresponding to a prescribed air volume control table. If the normal dehumidification is selected by the operation selection means, the dry operation is performed based on the specified frequency control table, and if the strong dehumidification operation having a larger dehumidification capacity than the normal dehumidification is selected, the strong dehumidification operation frequency is selected. The control device for an air conditioner according to any one of claims 2 and 4, wherein the dry operation is performed based on a control table. 7. An operation selecting means which can select at least a normal dehumidifying operation and a silent dehumidifying operation, and a plurality of silent dehumidifying operation air volume control tables in which the operation speed is set to a lower value corresponding to the prescribed air volume control table. If the normal dehumidification is selected by the operation selection means, a dry operation is performed based on the specified air volume control table, and a silent dehumidification operation that operates with a quieter operation sound than the normal dehumidification is selected.
The control device for an air conditioner according to any one of claims 1, 3, and 5, wherein a dry operation is performed based on the silent dehumidifying operation air volume control table. 8. An operation selecting means which can select at least a normal dehumidifying operation and a silent dehumidifying operation; a plurality of silent dehumidifying operation air volume control tables each having an operation frequency set to a lower value corresponding to a prescribed frequency control table; If the normal dehumidification is selected by the operation selection means, the dry operation is performed based on the specified frequency control table, and if the silent dehumidification operation that operates with a quieter operation sound than the normal dehumidification is selected, the silent operation is performed. 7. The dry operation is performed based on a dehumidification operation frequency control table.
The control device for an air conditioner according to any one of claims 1 to 4. 9. The defined air volume control table and the strong dehumidification operation air volume control table or the silent dehumidification operation air volume control table have different values for the room temperature or relative humidity for separating each block of each air volume control table. The control device for an air conditioner according to claim 5 or 7, wherein: 10. In the prescribed frequency control table and the strong dehumidification operation frequency control table or the silent dehumidification operation frequency control table, the division value of the room temperature or relative humidity for dividing each block of each frequency control table is different. The control device for an air conditioner according to claim 6 or 8, wherein 11. A plurality of prescribed air volume control tables, relative humidity input means for inputting and setting a desired indoor humidity, and a detected indoor relative humidity and a room input and set by said relative humidity input means during a dry operation. Based on the difference value with the set humidity, having a dehumidification setting area switching means to switch at least one preset dehumidification setting area,
2. The method according to claim 1, wherein a specified air volume control table corresponding to each of the dehumidification setting areas is selected and operated.
The control device for an air conditioner according to any one of 5, 7, and 9. 12. A plurality of prescribed frequency control tables, relative humidity input means for inputting and setting a desired indoor humidity, and a detected indoor relative humidity and a room input and set by said relative humidity input means during a dry operation. It has a dehumidification setting area switching means for switching at least one preset dehumidification setting area based on a difference value with the set humidity, and selects and operates a specified frequency control table corresponding to each dehumidification setting area. The control device for an air conditioner according to any one of claims 2, 6, 8, and 10, wherein: 13. A block shift judging means for counting a predetermined time from the previous change of the operation speed or the operation frequency and not changing the operation speed and / or the operation frequency until the predetermined time elapses. The control device for an air conditioner according to any one of claims 1, 2, and 5 to 12, wherein: