JP6989780B2 - Air conditioner - Google Patents

Description

The present disclosure relates to an air conditioner.

Conventionally, an air conditioner is equipped with an indoor unit and a human detection sensor, and performs different internal drying operations depending on whether the human detection sensor detects a person or not after cooling operation or dehumidifying operation. (See, for example, Japanese Patent Application Laid-Open No. 2018-11237 (Patent Document 1)).

Japanese Unexamined Patent Publication No. 2018-11237

By the way, in the above air conditioner, although the amount of water droplets adhering to the heat exchanger or the like is larger at the end of the cooling operation than at the end of the dehumidifying operation, the internal drying performed after the cooling operation or the dehumidifying operation is completed. The driving time is the same.

For this reason, in the above air conditioner, the time of the internal drying operation according to the dehumidifying mode including the cooling operation and the dehumidifying operation is not optimized, so that the internal drying operation is performed more than necessary and power is consumed. , The user may feel uncomfortable.

In addition, in the above air conditioner, depending on the dehumidification mode, the humidity returns to the room by performing the internal drying operation after the operation in which the amount of water droplets adhering to the heat exchanger is large, which causes discomfort to the user. May be given.

The present disclosure proposes an air conditioner capable of optimizing the time of internal drying operation according to the dehumidification mode.

Further, in the present disclosure, an air conditioner capable of suppressing humidity return during internal drying operation is proposed.

The air conditioner of the present disclosure is
A refrigerant circuit in which a compressor, an outdoor heat exchanger, an expansion mechanism and an indoor heat exchanger are connected in an annular shape,
An indoor unit having a casing in which the indoor heat exchanger is arranged in the air passage, and an indoor fan arranged in the air passage of the casing.
Internal drying that dries the inside of the air passage of the indoor unit by at least one of the ventilation operation in which the indoor air is circulated through the indoor heat exchanger by the indoor fan and the heating operation in which the indoor heat exchanger functions as a condenser. Equipped with a control device to operate
It is possible to operate in multiple dehumidification modes with different sizes of evaporation areas .
The internal drying operation performed after each of the plurality of dehumidifying modes is characterized in that different operating times can be used depending on the plurality of different dehumidifying modes.

According to the present disclosure, in the internal drying operation performed after each of the plurality of dehumidifying modes, it is possible to use different operating times according to the plurality of dehumidifying modes having different sizes of evaporation regions . If the priority is to dry the indoor heat exchanger firmly, the dehumidifying mode with a large amount of water droplets in the indoor heat exchanger is longer than the internal drying operation performed after the operation of the dehumidifying mode, so that the inside of the air passage of the indoor unit is surely dried. To be done. Thereby, the time of the internal drying operation can be optimized according to the dehumidification mode.

If priority is given to reducing the return of humidity from the indoor heat exchanger to the room, the dehumidifying mode with a larger amount of water droplets in the indoor heat exchanger can shorten the internal drying operation performed after the operation of the dehumidifying mode. , Prevents moisture from returning to the room. As a result, it is possible to suppress the return of humidity during the internal drying operation according to the dehumidification mode.

Further, in the air conditioner according to one aspect of the present disclosure,
In the operation of the plurality of dehumidifying modes, the first dehumidifying operation in which substantially the entire indoor heat exchanger is set as the evaporation region and the operation in which a part of the indoor heat exchanger is set as the condensed region, while the indoor heat exchanger is used. Including the second dehumidification operation with the remaining part of the evaporation area
The operation time of the internal drying operation after the first dehumidifying operation is longer than the operating time of the internal drying operation after the second dehumidifying operation.

According to the present disclosure, since the amount of water droplets adhering to the indoor heat exchanger after the completion of the first dehumidifying operation in which substantially the entire indoor heat exchanger is in the evaporation region is larger than that in the second dehumidifying operation, the first dehumidification is performed. By lengthening the operation time of the internal drying operation after the operation, it becomes possible to surely dry the inside of the air passage of the indoor unit after the end of the first dehumidifying operation.

Further, in the air conditioner according to one aspect of the present disclosure,
The operation of the plurality of dehumidifying modes includes a third dehumidifying operation in which a part of the indoor heat exchanger is set as an evaporation zone and the remaining part of the indoor heat exchanger is set as a superheat zone.
The operation time of the internal drying operation after the third dehumidifying operation is shorter than the operating time of the internal drying operation after the first dehumidifying operation, and the operating time of the internal drying operation after the second dehumidifying operation. Longer than.

According to the present disclosure, the operation time of the internal drying operation is set to be longer and shorter in the order of the first dehumidifying operation, the third dehumidifying operation, and the second dehumidifying operation in which the amount of water droplets adhering to the indoor heat exchanger is large. The time of the internal drying operation can be optimized according to the dehumidifying mode of the first to third dehumidifying operations.

Further, in the air conditioner according to one aspect of the present disclosure,
In the operation of the plurality of dehumidifying modes, the first dehumidifying operation in which substantially the entire indoor heat exchanger is set as the evaporation region and the operation in which a part of the indoor heat exchanger is set as the condensed region, while the indoor heat exchanger is used. Including the second dehumidification operation with the remaining part of the evaporation area
The operation time of the internal drying operation after the first dehumidifying operation is shorter than the operating time of the internal drying operation after the second dehumidifying operation.

According to the present disclosure, since the amount of water droplets adhering to the indoor heat exchanger after the completion of the first dehumidifying operation in which substantially the entire indoor heat exchanger is the evaporation area is larger than that in the second dehumidifying operation, the indoor heat exchange is performed. The larger the amount of water droplets in the vessel, the shorter the internal drying operation performed after the first dehumidifying operation, so that the humidity return during the internal drying operation after the completion of the first dehumidifying operation can be suppressed.

Further, in the air conditioner according to one aspect of the present disclosure,
The operation of the plurality of dehumidifying modes includes a third dehumidifying operation in which a part of the indoor heat exchanger is set as an evaporation zone and the remaining part of the indoor heat exchanger is set as a superheat zone.
The operation time of the internal drying operation after the third dehumidifying operation is longer than the operating time of the internal drying operation after the first dehumidifying operation, and is longer than the operating time of the internal drying operation after the second dehumidifying operation. Is also short.

According to the present disclosure, the operation time of the internal drying operation is set to be longer and shorter in the order of the second dehumidifying operation, the third dehumidifying operation, and the first dehumidifying operation in which the amount of water droplets adhering to the indoor heat exchanger is small. It is possible to suppress the return of humidity during the internal drying operation after the completion of the first to third dehumidifying operations.

Further, in the air conditioner according to one aspect of the present disclosure,
When the duration of the third dehumidifying operation is longer than the first predetermined time, the internal drying operation is performed after the third dehumidifying operation, and the internal drying operation is performed.
When the duration of the second dehumidifying operation is longer than the second predetermined time, the internal drying operation is performed after the second dehumidifying operation.

According to the present disclosure, when the duration of the third dehumidifying operation is less than the first predetermined time, that is, in the short-time third dehumidifying operation in which the amount of water droplets adhering to the indoor heat exchanger is small, the internal drying operation is not performed. , The internal drying operation can be performed efficiently. Further, when the duration of the second dehumidifying operation is less than the second predetermined time, that is, in the second dehumidifying operation for a short time in which the amount of water droplets adhering to the indoor heat exchanger is small, the internal drying operation is not performed, so that the internal drying operation is performed. Can be done efficiently.

It is a circuit diagram of the refrigerant circuit of the air conditioner of 1st Embodiment of this disclosure. It is sectional drawing of the indoor unit of the said air conditioner. It is a control block diagram of the said air conditioner. It is a schematic diagram for demonstrating the cooling dehumidification operation of the said air conditioner. It is a schematic diagram for demonstrating the over-throbbing dehumidification operation of the said air conditioner. It is a schematic diagram for demonstrating the reheat dehumidification operation of the said air conditioner. It is a Moriel diagram at the time of the cooling dehumidification operation, the over-throttle dehumidification operation, and the reheat dehumidification operation of the air conditioner. It is a timing chart explaining the internal drying operation of the said air conditioner. It is a timing chart explaining the internal drying operation of the air conditioner of the 3rd Embodiment of this disclosure.

Hereinafter, embodiments will be described. In the drawings, the same reference number represents the same part or the corresponding part. Further, the dimensions on the drawing such as length, width, thickness, and depth are appropriately changed from the actual scale for the purpose of clarifying and simplifying the drawing, and do not represent the actual relative dimensions.

[First Embodiment]
FIG. 1 is a circuit diagram of a refrigerant circuit RC included in the air conditioner according to the first embodiment of the present disclosure.

The air conditioner includes an indoor unit 1 installed indoors to be air-conditioned and an outdoor unit 2 installed outdoors.

<Structure of indoor unit 1>
The indoor unit 1 of the air conditioner is, for example, a wall-mounted indoor unit mounted on a wall surface of the room. The indoor unit 1 has an indoor heat exchanger 11, an indoor fan 12 that sends air to the indoor heat exchanger 11, an indoor heat exchanger temperature sensor 51 that detects the temperature of the indoor heat exchanger 11, and an indoor temperature. It has an indoor temperature sensor 52 for detecting, an indoor humidity sensor 53 for detecting indoor humidity, and a streamer discharge unit 30.

The indoor heat exchanger 11 is located on the upstream side of the indoor fan 12 with respect to the air flow by the indoor fan 12. The indoor heat exchanger 11 has a main body heat exchange unit 11a, an auxiliary heat exchange unit 11b, and an electromagnetic valve 13 as an example of a control valve in order to exchange heat between the air from the indoor fan 12 and the refrigerant. Have.

The main body heat exchange portion 11a includes a front portion 11a-1 located on the indoor side and a back portion 11a-2 located on the side opposite to the indoor side. Further, the front portion 11a-1 is fluidly connected to the back portion 11a-2 via the refrigerant pipes L12 and L13 and the solenoid valve 13. As a result, the refrigerant flowing from the expansion valve 24 to the main body heat exchange portion 11a can flow into the back portion 11a-2 after flowing through the front portion 11a-1.

The auxiliary heat exchange portion 11b is provided on the side opposite to the back surface portion 11a-2 side of the main body heat exchange portion 11a with respect to the front portion 11a-1 of the main body heat exchange portion 11a. That is, the auxiliary heat exchange portion 11b is located on the indoor side of the front portion 11a-1 of the main body heat exchange portion 11a. The volume of the auxiliary heat exchange unit 11b is smaller than that of the main body heat exchange unit 11a. Further, the refrigerant pipe L4 is connected to one end of the auxiliary heat exchange portion 11b, and the front portion 11a-1 of the main body heat exchange portion 11a is connected to the other end of the auxiliary heat exchange portion 11b via the refrigerant pipe L11. As a result, the refrigerant from the expansion valve 24 side is supplied to the main body heat exchange unit 11a via the auxiliary heat exchange unit 11b.

As the indoor fan 12, for example, a cross flow fan is adopted. This cross-flow fan blows out air whose temperature and the like are adjusted by the indoor heat exchanger 11 toward the room.

The solenoid valve 13 is provided in the middle portion of the refrigerant path of the indoor heat exchanger 11. More specifically, it is a valve for setting a differential pressure between the front portion 11a-1 side of the main body heat exchange portion 11a and the back surface portion 11a-2 side of the main body heat exchange portion 11a. The solenoid valve 13 is an on / off valve that can take only two positions, a large opening and a small opening, and is turned on when necessary (for example, during the reheat dehumidification operation described later), and is slightly opened from the position of the large opening. Can be switched to the degree position.

<Structure of outdoor unit 2>
The outdoor unit 2 of the air conditioner includes a compressor 21, a four-way switching valve 22, an outdoor heat exchanger 23, an expansion valve 24 as an example of an expansion mechanism, an accumulator 25, and an outdoor heat exchanger 23. It has an outdoor fan 26 that sends air. Further, the outdoor unit 2 includes an outdoor heat exchanger temperature sensor 56 that detects the temperature of the outdoor heat exchanger 23, an outside air temperature sensor 57 that detects the outside air temperature, and the temperature (evaporation temperature) of the refrigerant decompressed by the expansion valve 24. ) Is provided with a refrigerant temperature sensor 58.

The outdoor heat exchanger 23 is located on the downstream side of the outdoor fan 26 with respect to the air flow by the outdoor fan 26. The refrigerant flowing in the outdoor heat exchanger 23 exchanges heat with the air from the outdoor fan 26.

The expansion valve 24 is, for example, an electric valve that can be adjusted to an opening degree of 3 or more different from each other, and the opening degree changes according to a signal from the control device 100 (shown in FIG. 3).

<Construction of refrigerant circuit RC>
Further, the refrigerant circuit RC of the air conditioner includes an indoor heat exchanger 11, a compressor 21, a four-way switching valve 22, an outdoor heat exchanger 23, an expansion valve 24, an accumulator 25, and refrigerant pipes L1 to L7. .. More specifically, the indoor heat exchanger 11, the compressor 21, the four-way switching valve 22, the outdoor heat exchanger 23, the expansion valve 24, and the accumulator 25 are fluidly connected by the refrigerant pipes L1 to L7. As a result, the annular refrigerant circuit RC is configured. In such a refrigerant circuit RC, the refrigerant circulates by driving the compressor 21.

Although not shown, the air conditioner includes a remote controller (hereinafter referred to as "remote controller"). The user can operate the remote controller to start or stop automatic operation, cooling operation, heating operation, dehumidifying operation, and the like.

FIG. 2 is a schematic cross-sectional view of the indoor unit 1.

As shown in FIG. 2, the indoor unit 1 has a casing 10 in which the indoor heat exchanger 11 is arranged in the air passage, and an indoor unit in which the indoor heat exchanger 11 is arranged in the air passage of the casing 10 and downstream of the indoor heat exchanger 11. The fan 12 and the streamer discharge unit 30 are provided in the air passage of the casing 10 and on the upstream side of the indoor heat exchanger 11. In FIG. 2, reference numeral 31 is a horizontal flap provided at the outlet 1a and rotatable in the vertical direction. Further, the wind passage of the casing 10 is an air flow passage indicated by a thick solid arrow.

In the streamer discharge unit 30, streamer discharge, which is a kind of plasma discharge, is generated. When this streamer discharge occurs, active species with high oxidative decomposition power are generated, and these active species are harmful components composed of small organic molecules such as ammonia, aldehydes, and nitrogen oxides in the air passage of the casing 10. Decomposes and odorous components.

Further, FIG. 3 is a control block diagram of the air conditioner.

As shown in FIG. 3, the air conditioner includes a control device 100 for controlling the refrigerant circuit RC. More specifically, the control device 100 includes a microcomputer, an input / output circuit, and the like. The control device 100 compresses based on signals from the indoor heat exchanger temperature sensor 51, the indoor temperature sensor 52, the indoor humidity sensor 53, the outdoor heat exchanger temperature sensor 56, the outside air temperature sensor 57, the refrigerant temperature sensor 58, and the like. It controls the machine 21, the four-way switching valve 22, the expansion valve 24, the outdoor fan 26, the indoor fan 12, the electromagnetic valve 13, the streamer discharge unit 30, the horizontal flap drive motor 32, and the like.

Further, the control device 100 has a cooling / dehumidifying operation control unit 100a that performs a cooling / dehumidifying operation in which substantially the entire indoor heat exchanger 11 is in an evaporation region, and a part of the indoor heat exchanger 11 is in an evaporation region. The over-throttle dehumidification operation control unit 100b that performs the over-throttle dehumidification operation that makes the remaining part of the indoor heat exchanger 11 an overheat region, and a part of the indoor heat exchanger 11 that is a condensation region, while the indoor heat exchanger 11 It has a reheat dehumidifying operation control unit 100c that performs a reheat dehumidifying operation with the remaining portion as an evaporation area. The cooling dehumidification operation control unit 100a, the over-throttle dehumidification operation control unit 100b, and the reheat dehumidification operation control unit 100c are each configured by software. The cooling dehumidification operation is an example of the first dehumidification operation, the over-throttle dehumidification operation is an example of the third dehumidification operation, and the reheat dehumidification operation is an example of the second dehumidification operation.

The cooling dehumidification operation (first dehumidification operation), over-squeezing dehumidification operation (third dehumidification operation), and reheat dehumidification operation (second dehumidification operation) are operations in dehumidification modes in which the area of the evaporation area of the indoor heat exchanger 11 is different. Is.

[Cooling dehumidification operation (first dehumidification operation)]
As shown in FIG. 1, the cooling dehumidification operation (first dehumidification operation) is started by switching the four-way switching valve 22 to the solid line switching position and activating the compressor 21. During this cooling dehumidification operation (first dehumidification operation), the high-temperature and high-pressure refrigerant discharged from the compressor 21 flows into the outdoor heat exchanger 23 via the four-way switching valve 22. Then, the refrigerant condensed by the outdoor heat exchanger 23 is decompressed by the expansion valve 24, and then the auxiliary heat exchange portion 11b of the indoor heat exchanger 11 and the main body heat exchange portion 11a of the indoor heat exchanger 11 are subjected to this. It flows in order. The refrigerant evaporated in the main body heat exchange unit 11a and the auxiliary heat exchange unit 11b returns to the suction side of the compressor 21 via the four-way switching valve 22 and the accumulator 25. In this way, when the refrigerant circulates in the refrigerant circuit RC, the cooling / dehumidifying operation control unit 100a adjusts the frequency of the compressor 21 and the opening degree of the expansion valve 24, and turns off the solenoid valve 13. As shown in FIG. 4, substantially the entire indoor heat exchanger 11 is set as an evaporation region (hatched region shown in FIG. 4). As a result, the cooling dehumidifying operation (first dehumidifying operation) has a high sensible heat capacity, which is the ability to change the room temperature.

Here, to make the entire indoor heat exchanger 11 substantially an evaporation region is not only when the entire indoor heat exchanger 11 is made into an evaporation region, but also a part of the indoor heat exchanger 11 under predetermined conditions. It also includes the case where only the excluded part is set as the evaporation area. As a predetermined condition that only a part of this (for example, a portion of 1/3 or less of the total volume of the indoor heat exchanger 11) does not become an evaporation region, for example, depending on the indoor environment or the like, in the vicinity of the refrigerant outlet of the indoor heat exchanger 11. There are times when the part becomes an overheated area.

[Over-throttle dehumidification operation (third dehumidification operation)]
In the over-throttle dehumidification operation (third dehumidification operation), the refrigerant flows in the same direction as in the cooling dehumidification operation (first dehumidification operation). At this time, the over-throttle dehumidification operation control unit 100b adjusts the frequency of the compressor 21 and the opening degree of the expansion valve 24, and turns off the solenoid valve 13 to turn off the electromagnetic valve 13 so as to be one on the upstream side of the indoor heat exchanger 11. The portion is set as an evaporation region, while the remaining portion of the indoor heat exchanger 11 is set as a superheat region. For example, as shown in FIG. 5, the over-throttle dehumidification operation control unit 100b makes the auxiliary heat exchange unit 11b an evaporation region (a region with hatched diagonal lines), while the front portion 11a-1 of the main body heat exchange unit 11a. And the back surface portion 11a-2 is set as an overheated region (a region with hatches at the points shown in FIG. 5). As a result, the over-throttle dehumidification operation (third dehumidification operation) has a lower sensible heat capacity than the cooling dehumidification operation (first dehumidification operation), so that the room temperature drops when the heat load in the room is neither high nor low. You can dehumidify the room while suppressing it. In FIG. 5, the entire auxiliary heat exchange unit 11b is drawn so as to be in the evaporation region, but it is also possible to make only a part of the auxiliary heat exchange unit 11b into the evaporation region. That is, the evaporation region is a variable region whose volume can be changed.

Further, the compressor 21 and the expansion valve 24 are controlled so that the volume of the evaporation region changes according to the load during the over-throttle dehumidification operation (third dehumidification operation). For example, the over-throttle dehumidification operation control unit 100b is set so that the evaporation area is equal to or less than a predetermined volume (for example, 2/3 of the total volume of the indoor heat exchanger 11) during the over-throttle dehumidification operation (third dehumidification operation). It controls the compressor 21 and the expansion valve 24.

Here, what changes according to the load means that it changes according to the amount of heat supplied from the room to the evaporation area, and the amount of heat is, for example, the indoor temperature (the temperature of the air sucked by the indoor unit 1) and the indoor air amount. It is determined by (the amount of wind blown by the indoor unit 1). Further, the load corresponds to the required dehumidifying capacity (required cooling capacity), and can be detected based on, for example, the difference between the room temperature and the set temperature. As the set temperature, a preset temperature or a temperature set by the user with the remote controller is used.

[Reheat dehumidification operation (second dehumidification operation)]
In the reheat dehumidification operation (second dehumidification operation), the refrigerant flows in the same direction as in the cooling dehumidification operation (first dehumidification operation). At this time, the reheat dehumidifying operation control unit 100c adjusts the frequency of the compressor 21 and the opening degree of the expansion valve 24, and turns on the solenoid valve 13 so that the room heat exchanger 11 is connected to the solenoid valve 13. At least a part of the upstream side of the room heat exchanger 11 is set as a condensation area, while at least a part of the room heat exchanger 11 on the downstream side of the solenoid valve 13 is set as an evaporation area. For example, as shown in FIG. 6, the reheat dehumidification operation control unit 100c has a condensation region (lattice hatching shown in FIG. 6) in which the auxiliary heat exchange unit 11b and the front portion 11a-1 of the main body heat exchange unit 11a are provided. On the other hand, the back surface portion 11a-2 of the main body heat exchange portion 11a is set to an evaporation region (hatched region shown in FIG. 6). As a result, the reheat dehumidification operation (second dehumidification operation) has a lower sensible heat capacity than the over-throttle dehumidification operation (third dehumidification operation), so that when the heat load in the room is low, the decrease in room temperature is suppressed. , Can dehumidify the room.

Further, in the reheat dehumidification operation, the solenoid valve 13 is switched to a position having a small opening degree. That is, the opening degree of the solenoid valve 13 in the reheat dehumidification operation is an opening degree corresponding to an air flow rate of less than 10.0 L / min. The opening degree of the solenoid valve 13 in the reheat dehumidification operation is preferably an opening degree corresponding to an air flow rate of 5.0 L / min. Further, the opening degree of the solenoid valve 13 in the reheat dehumidification operation is more preferably as long as the opening degree corresponds to an air flow rate of 3.5 L / min. Here, "the opening degree of the solenoid valve 13 in the reheat dehumidifying operation is an opening degree corresponding to an air flow rate of less than 10 L / min" means that the air flow rate flowing through the refrigerant circuit RC at the said opening degree is 10 L / min. It does not mean that it is less than min, but that the air flow rate at the opening degree obtained from the flow rate characteristics of the solenoid valve 13 is less than 10 L / min.

The cooling dehumidification operation (first dehumidification operation), over-squeezing dehumidification operation (third dehumidification operation), or reheat dehumidification operation (second dehumidification operation) is started in response to the pressing of the dehumidification operation button on the remote controller. ing. More specifically, when the dehumidification operation button is pressed, the cooling dehumidification operation (first dehumidification operation), over-squeezing dehumidification operation (third dehumidification operation), and reheat dehumidification operation (first dehumidification operation) are performed based on the sensible heat ratio SHF. 2 Dehumidification operation) is automatically selected and started. After that, it automatically switches to another dehumidifying operation according to the change in the sensible heat ratio SHF. Here, the sensible heat ratio SHF is expressed as sensible heat / (sensible heat + latent heat), and for example, sensible heat and latent heat are calculated based on the room temperature and the room humidity.

FIG. 7 is a Moriel diagram during the cooling dehumidification operation (first dehumidification operation), the over-throttle dehumidification operation (third dehumidification operation), and the reheat dehumidification operation (second dehumidification operation) of the air conditioner.

The control of the over-throttle dehumidification operation control unit 100b is performed so that the evaporation temperature of the over-throttle dehumidification operation (third dehumidification operation) is lower than the evaporation temperature of the cooling dehumidification operation (first dehumidification operation). At this time, the opening degree of the expansion valve 24 is usually smaller than the opening degree of the expansion valve 24 during the cooling dehumidification operation (first dehumidification operation).

The reheat dehumidification operation control unit 100c is controlled so that the evaporation temperature of the reheat dehumidification operation (second dehumidification operation) is lower than the evaporation temperature of the over-throttle dehumidification operation (third dehumidification operation). At this time, the opening degree of the expansion valve 24 is fixed to an opening degree larger than the maximum opening degree of the expansion valve 24 during the over-throttle dehumidification operation (third dehumidification operation).

Further, the over-throttle dehumidification operation control unit 100b adjusts the opening degree of the expansion valve 24 by using the evaporation temperature detected by the refrigerant temperature sensor 58 after the start of the over-throttle dehumidification operation (third dehumidification operation). More specifically, the opening degree of the expansion valve 24 is set so that the evaporation temperature becomes a predetermined temperature (for example, 10 ° C.) and the middle portion of the refrigerant path of the indoor heat exchanger 11 becomes a superheat region. Is adjusted.

Further, the cooling dehumidification operation control unit 100a and the over-throttle dehumidification operation control unit 100b switch between the cooling dehumidification operation (first dehumidification operation) and the over-throttle dehumidification operation (third dehumidification operation) based on the sensible heat ratio SHF. .. The first threshold of the sensible heat ratio SHF when switching from this cooling dehumidification operation (first dehumidification operation) to the over-squeezing dehumidification operation (third dehumidification operation), and the cooling dehumidification operation (second dehumidification operation) from the reheat dehumidification operation (second dehumidification operation). The second threshold value of the sensible heat ratio SHF when switching to the first dehumidification operation) is set to a different value so as to have hysteresis in mutual switching.

The over-throttle dehumidification operation control unit 100b and the reheat dehumidification operation control unit 100c switch between the over-throttle dehumidification operation (third dehumidification operation) and the reheat dehumidification operation (second dehumidification operation) based on the sensible heat ratio SHF. .. The third threshold of the sensible heat ratio SHF when switching from this overheat dehumidification operation (third dehumidification operation) to the reheat dehumidification operation (second dehumidification operation), and the overheat dehumidification operation from the reheat dehumidification operation (second dehumidification operation). The second threshold value of the sensible heat ratio SHF when switching to the operation (third dehumidifying operation) is set to a different value so as to have hysteresis in the mutual switching.

In the air conditioner having the above configuration, the control device 100 is used to inside after each of the cooling dehumidification operation (first dehumidification operation), the over-throttle dehumidification operation (third dehumidification operation), and the reheat dehumidification operation (second dehumidification operation) are completed. Perform a dry operation. This internal drying operation is performed in the air passage of the indoor unit 1 by a ventilation operation in which the indoor air is circulated through the indoor heat exchanger 11 by the indoor fan 12 and a heating operation in which the indoor heat exchanger 11 functions as a condenser. To dry.

As shown in FIG. 1, the heating operation is started by switching the four-way switching valve 22 to the switching position of the dotted line and activating the compressor 21. During this heating operation, the high-temperature and high-pressure refrigerant discharged from the compressor 21 flows into the indoor heat exchanger 11 via the four-way switching valve 22. Then, the refrigerant condensed in the indoor heat exchanger 11 is decompressed by the expansion valve 24 and then flows into the outdoor heat exchanger 23. The refrigerant evaporated in the outdoor heat exchanger 23 returns to the suction side of the compressor 21 via the four-way switching valve 22 and the accumulator 25. At this time, the expansion valve 24 is set to a predetermined opening degree, the solenoid valve 13 is turned off, and the refrigerant circulates in the refrigerant circuit RC, so that the indoor heat exchanger 11 functions as a condenser and the outdoor heat exchanger 23 is an evaporator. Functions as.

FIG. 8 is a timing chart illustrating the internal drying operation.

As shown in FIG. 8, when the operation command is the internal drying operation, the streamer discharge unit 30 (shown in FIGS. 1 to 3) is turned on in the first period t1, and the horizontal flap 31 is turned on by the horizontal flap drive motor 32. The first predetermined opening is opened from the fully closed state.

Next, in the period t2, the horizontal flap 31 is opened by the second predetermined opening (> the first predetermined opening), and the indoor fan 12 is driven to circulate the indoor air through the air passage of the indoor unit 1. Drive.

Next, in the period t3, the indoor fan 12 is stopped to stop the blowing operation, and the horizontal flap 31 is fully closed.

Next, in the period t4, the indoor fan 12 is driven again to perform a blowing operation in which the indoor air is circulated through the air passage of the indoor unit 1. At this time, the rotation speed of the indoor fan 12 is set higher than that in the period t2.

Next, in the period t5, the indoor fan 12 is stopped to stop the blowing operation, and the horizontal flap 31 is fully closed. At the end of this period t5, the streamer discharge unit 30 is turned off.

Next, in the period t6, the horizontal flap 31 is opened from the fully closed state by a third predetermined opening (<first predetermined opening), the capacity supply is turned on, and the heating operation is performed.

Next, in the period t7, the horizontal flap 31 is opened by a second predetermined opening, the indoor fan 12 is stopped, and the ventilation operation is stopped.

Then, at the end of the period t7, the horizontal flap 31 is fully closed to end the internal drying operation.

In this way, the inside of the air passage of the indoor unit 1 is dried by the ventilation operation in which the indoor fan 12 circulates the indoor air through the indoor heat exchanger 11 and the heating operation in which the indoor heat exchanger 11 functions as a condenser.

In the above air conditioner, the operation time T1 (= t1 + ... + t7) is set to 100 minutes in the internal drying operation after the cooling dehumidifying operation (first dehumidifying operation), and the internal drying operation after the over-squeezing dehumidifying operation (third dehumidifying operation). In the internal drying operation after the reheat dehumidification operation (second dehumidification operation), the operation time T3 (= t1 + ... + T7) is shortened to 75 minutes by shortening the period t2, and the operation time T2 (= t1 + ... + T7) is further shortened. = T1 + ... + t7) is set to 55 minutes.

In this first embodiment, the operation time T1 is 100 minutes, T3 is 75 minutes, and T2 is 55 minutes, but it may be appropriately set according to the configuration of the air conditioner.

According to the air conditioner of the first embodiment, each of the plurality of dehumidifying modes of cooling dehumidification operation (first dehumidification operation), over-squeezing dehumidification operation (third dehumidification operation), and reheat dehumidification operation (second dehumidification operation). It is possible to use different operating times T1, T3, and T2 in the internal drying operation performed after the operation. Therefore, when giving priority to drying the indoor heat exchanger 11 firmly, the dehumidifying mode in which the amount of water droplets in the indoor heat exchanger 11 is large is longer the internal drying operation performed after the operation of the dehumidifying mode, so that the indoor unit is united. Make sure that the inside of the air passage of 1 is dried. Thereby, the time of the internal drying operation can be optimized according to the dehumidification mode. The amount of water droplets in the indoor heat exchanger 11 varies depending on the indoor environment and operating time, but the cooling dehumidification operation (first dehumidification operation) is H1, the over-squeezing dehumidification operation (third dehumidification operation) is H3, and the reheat dehumidification operation. Assuming that (second dehumidification operation) is H2, the amount of water droplets in the indoor heat exchanger 11 in each operation is
H1 ＞ H3 ＞ H2
It has become.

Further, the amount of water droplets adhering to the indoor heat exchanger 11 after the completion of the cooling dehumidification operation (first dehumidification operation) in which substantially the entire indoor heat exchanger 11 is in the evaporation region is the reheat dehumidification operation (second dehumidification operation). Since it is more than the operation), the operation time of the internal drying operation after the cooling dehumidifying operation (first dehumidifying operation) is lengthened, and the inside of the air passage of the indoor unit 1 after the cooling dehumidifying operation (first dehumidifying operation) is completed. It becomes possible to surely dry.

In addition, internal drying is performed in the order of cooling dehumidification operation (first dehumidification operation), over-squeezing dehumidification operation (third dehumidification operation), and reheat dehumidification operation (second dehumidification operation) in which the amount of water droplets adhering to the indoor heat exchanger 11 is large. By setting the operation time to be long or short, the internal drying operation time can be lengthened by the operation in the dehumidification mode in which the amount of water droplets adhering to the indoor heat exchanger 11 is large. As a result, the time of the internal drying operation can be optimized according to the cooling dehumidification operation (first dehumidification operation), the over-squeezing dehumidification operation (third dehumidification operation), and the reheat dehumidification operation (second dehumidification operation).

Further, when the duration of the over-throttle dehumidification operation (third dehumidification operation) is less than the first predetermined time (for example, 100 minutes), that is, the over-throttle dehumidification operation for a short time in which the amount of water droplets adhering to the indoor heat exchanger 11 is small. Since the internal drying operation is not performed in the (third dehumidifying operation), the internal drying operation can be efficiently performed. Further, when the duration of the reheat dehumidification operation (second dehumidification operation) is less than the second predetermined time (for example, 100 minutes), that is, the reheat dehumidification operation for a short time in which the amount of water droplets adhering to the indoor heat exchanger 11 is small. Since the internal drying operation is not performed in the (second dehumidifying operation), the internal drying operation can be efficiently performed.

[Second Embodiment]
The air conditioner of the second embodiment of the present disclosure has the same configuration as the air conditioner of the first embodiment except for the operation of the control device 100, and FIGS. 1 to 8 are incorporated.

In the above air conditioner, the operation time T1 (= t1 + ... + t7) is set to 55 minutes in the internal drying operation after the cooling dehumidifying operation (first dehumidifying operation), and the internal drying operation after the over-squeezing dehumidifying operation (third dehumidifying operation). In the internal drying operation after the reheat dehumidification operation (second dehumidification operation), the period t2 is lengthened to set the operation time T3 (= t1 + ... + T7) to 75 minutes, and the period t2 is further lengthened to set the operation time T2 (= t1 + ... + T7). = T1 + ... + t7) is set to 100 minutes.

In this first embodiment, the operation time T1 is 55 minutes, T3 is 75 minutes, and T2 is 100 minutes, but it may be appropriately set according to the configuration of the air conditioner.

According to the air conditioner of the second embodiment, each of the plurality of dehumidifying modes of cooling dehumidification operation (first dehumidification operation), over-squeezing dehumidification operation (third dehumidification operation), and reheat dehumidification operation (second dehumidification operation). It is possible to use different operating times T1, T3, and T2 in the internal drying operation performed after the operation. Therefore, when giving priority to reducing the return of humidity from the indoor heat exchanger 11 to the room, the dehumidifying mode in which the amount of water droplets in the indoor heat exchanger 11 is large, the shorter the internal drying operation performed after the operation of the dehumidifying mode is shortened. This prevents moisture from returning to the room. As a result, it is possible to suppress the return of humidity during the internal drying operation. The amount of water droplets in the indoor heat exchanger 11 varies depending on the indoor environment and operating time, but the cooling dehumidification operation (first dehumidification operation) is H1, the over-squeezing dehumidification operation (third dehumidification operation) is H3, and the reheat dehumidification operation. Assuming that (second dehumidification operation) is H2, the amount of water droplets in the indoor heat exchanger 11 in each operation is
H1 ＞ H3 ＞ H2
It has become.

Further, since the amount of water droplets adhering to the indoor heat exchanger 11 after the completion of the cooling dehumidification operation (first dehumidification operation) is larger than that of the reheat dehumidification operation (second dehumidification operation), the amount of water droplets in the indoor heat exchanger 11 The more the cooling and dehumidifying operation (first dehumidifying operation), the shorter the internal drying operation performed after the cooling and dehumidifying operation (first dehumidifying operation). As a result, it is possible to suppress the return of humidity during the internal drying operation after the cooling dehumidifying operation (first dehumidifying operation) is completed.

In addition, the inside is in the order of reheat dehumidification operation (second dehumidification operation), over-squeezing dehumidification operation (third dehumidification operation), and cooling dehumidification operation (first dehumidification operation) in which the amount of water droplets adhering to the indoor heat exchanger 11 is small. By setting the operation time of the drying operation to long and short, the inside after the operation of cooling dehumidification operation (first dehumidification operation), over-squeezing dehumidification operation (third dehumidification operation), and reheat dehumidification operation (second dehumidification operation) is completed. It is possible to suppress the return of humidity during dry operation.

Further, when the duration of the over-throttle dehumidification operation (third dehumidification operation) is less than the first predetermined time (for example, 100 minutes), that is, the over-throttle dehumidification operation for a short time in which the amount of water droplets adhering to the indoor heat exchanger 11 is small. Since the internal drying operation is not performed in the (third dehumidifying operation), the internal drying operation can be efficiently performed. Further, when the duration of the reheat dehumidification operation (second dehumidification operation) is less than the second predetermined time (for example, 100 minutes), that is, the reheat dehumidification operation for a short time in which the amount of water droplets adhering to the indoor heat exchanger 11 is small. Since the internal drying operation is not performed in the (second dehumidifying operation), the internal drying operation can be efficiently performed.

[Third Embodiment]
The air conditioner of the third embodiment of the present disclosure has the same configuration as the air conditioner of the first embodiment except for the operation of the humidifying device (not shown) and the internal drying operation, and FIGS. 7 is used.

The air conditioner of the third embodiment includes a humidifying device that supplies humidified air from the outside into the air passage of the indoor unit 1 via a humidifying hose.

FIG. 9 is a timing chart illustrating the internal drying operation.

As shown in FIG. 9, when the operation command is the internal drying operation, the streamer discharge unit 30 (shown in FIGS. 1 to 3) is turned on in the first period t1, and the horizontal flap 31 is turned on by the horizontal flap drive motor 32. The first predetermined opening is opened from the fully closed state.

Next, in the period t2a, the horizontal flap 31 is opened by the second predetermined opening (> the first predetermined opening), and the indoor fan 12 is driven to circulate the indoor air through the air passage of the indoor unit 1. Drive. Here, according to the humidifying hose drying command, the outside air heated by the heater in the humidifying device is supplied from the humidifying device to the air passage of the indoor unit 1 via the humidifying hose to dry the inside of the humidifying hose.

Next, in the period t2b, the humidifying device is stopped, and the ventilation operation in which the indoor air is circulated through the air passage of the indoor unit 1 is continued.

Next, in the period t3, the indoor fan 12 is stopped to stop the blowing operation, and the horizontal flap 31 is fully closed.

Next, in the period t4, the indoor fan 12 is driven again to perform a blowing operation in which the indoor air is circulated through the air passage of the indoor unit 1. At this time, the rotation speed of the indoor fan 12 is set higher than that during the periods t2a and t2b.

Next, in the period t5, the indoor fan 12 is stopped to stop the blowing operation, and the horizontal flap 31 is fully closed. At the end of this period t5, the streamer discharge unit 30 is turned off.

Next, in the period t6, the horizontal flap 31 is opened from the fully closed state by a third predetermined opening (<first predetermined opening), the capacity supply is turned on, and the heating operation is performed.

Next, in the period t7, the horizontal flap 31 is opened by a second predetermined opening, the indoor fan 12 is stopped, and the ventilation operation is stopped.

Then, at the end of the period t7, the horizontal flap 31 is fully closed to end the internal drying operation.

In this way, the inside of the air passage of the indoor unit 1 is dried by the ventilation operation in which the indoor fan 12 circulates the indoor air through the indoor heat exchanger 11 and the heating operation in which the indoor heat exchanger 11 functions as a condenser.

In the air conditioner of the third embodiment, when the priority is given to dry the indoor heat exchanger 11 firmly as in the first embodiment, the operation is performed in the internal drying operation after the cooling dehumidification operation (first dehumidification operation). The time T1 (= t1 + ... + t7) is set to 100 minutes, and in the internal drying operation after the over-throttle dehumidification operation (third dehumidification operation), the period t2 is shortened and the operation time T3 (= t1 + ... + t7) is set to 75 minutes. In the internal drying operation after the reheat dehumidification operation (second dehumidification operation), the period t2 is shortened and the operation time T2 (= t1 + ... + t7) is set to 55 minutes.

As in the second embodiment, when giving priority to reducing the return of humidity from the indoor heat exchanger 11 to the room, the operation time T1 (=) in the internal drying operation after the cooling dehumidification operation (first dehumidification operation). In the internal drying operation after the over-throttle dehumidification operation (third dehumidification operation), t1 + ... + t7) is set to 55 minutes, the period t2 is lengthened, the operation time T3 (= t1 + ... + t7) is set to 75 minutes, and the reheat dehumidification operation is performed. In the internal drying operation after the (second dehumidifying operation), the period t2 may be lengthened and the operating time T2 (= t1 + ... + T7) may be set to 100 minutes.

In the first to third embodiments, the internal drying operation is performed after each of the cooling dehumidification operation (first dehumidification operation), the over-squeezing dehumidification operation (third dehumidification operation), and the reheat dehumidification operation (second dehumidification operation). However, the present invention may be applied to an air conditioner without an over-throttle dehumidification operation (third dehumidification operation). In this case, after the cooling dehumidification operation (first dehumidification operation) and the reheat dehumidification operation (second dehumidification operation) are completed, internal drying operations with different operation times are performed.

Further, in the first to third embodiments, the air conditioner provided with the streamer discharge unit 30 has been described, but the present invention may be applied to the air conditioner not provided with the streamer discharge unit.

Further, in the first to third embodiments, the wind of the indoor unit 1 is operated by the ventilation operation in which the indoor fan 12 circulates the indoor air through the indoor heat exchanger 11 and the heating operation in which the indoor heat exchanger 11 functions as a condenser. Although the internal drying operation for drying the inside of the passage is performed, the internal drying operation may be performed by only one of the ventilation operation and the heating operation.

Although the specific embodiments of the present disclosure have been described, the present disclosure is not limited to the first to third embodiments described above, and various modifications can be made within the scope of the present disclosure.

1 ... Indoor unit 1a ... Blowout 2 ... Outdoor unit 10 ... Casing 11 ... Indoor heat exchanger 11a ... Main body heat exchange part 11a-1 ... Front part 11a-2 ... Back part 11b ... Auxiliary heat exchange part 12 ... Indoor fan 13 … Solenoid valve 21… Compressor 22… Four-way switching valve 23… Outdoor heat exchanger 24… Expansion valve (expansion mechanism)
25 ... Accumulator 26 ... Outdoor fan 30 ... Streamer discharge unit 31 ... Horizontal flap 32 ... Horizontal flap drive motor 51 ... Indoor heat exchanger temperature sensor 52 ... Indoor temperature sensor 53 ... Indoor humidity sensor 56 ... Outdoor heat exchanger temperature sensor 57 ... Outside air temperature sensor 58 ... Refrigerator temperature sensor 100 ... Control device 100a ... Cooling dehumidification operation control unit 100b ... Over-throttle dehumidification operation control unit 100c ... Reheat dehumidification operation control unit RC ... Refrigerator circuit

Claims (6)

A refrigerant circuit (RC) in which a compressor (21), an outdoor heat exchanger (23), an expansion mechanism (24) and an indoor heat exchanger (11) are connected in an annular shape,
An indoor unit (1) having a casing (10) in which the indoor heat exchanger (11) is arranged in the air passage and an indoor fan (12) arranged in the air passage of the casing (10). ,
The indoor unit (12) is operated by at least one of a ventilation operation in which indoor air is circulated through the indoor heat exchanger (11) by the indoor fan (12) and a heating operation in which the indoor heat exchanger (11) functions as a condenser. 1) It is equipped with a control device (100) that performs an internal drying operation to dry the inside of the air passage.
It is possible to operate in multiple dehumidification modes with different sizes of evaporation areas .
The air conditioner is characterized in that the internal drying operation performed after each of the plurality of dehumidifying modes can use different operating times according to the plurality of different dehumidifying modes. In the air conditioner according to claim 1,
In the operation of the plurality of dehumidifying modes, the first dehumidifying operation in which substantially the entire indoor heat exchanger (11) is set as the evaporation region and the operation in which a part of the indoor heat exchanger (11) is set as the condensed region are performed. , Including the second dehumidification operation in which the remaining part of the indoor heat exchanger (11) is the evaporation area.
An air conditioner characterized in that the operating time of the internal drying operation after the first dehumidifying operation is longer than the operating time of the internal drying operation after the second dehumidifying operation. In the air conditioner according to claim 2,
The operation of the plurality of dehumidifying modes includes a third dehumidifying operation in which a part of the indoor heat exchanger (11) is set as an evaporation region and the remaining part of the indoor heat exchanger (11) is set as a superheat region. ,
The operation time of the internal drying operation after the third dehumidifying operation is shorter than the operating time of the internal drying operation after the first dehumidifying operation, and the operating time of the internal drying operation after the second dehumidifying operation. An air conditioner characterized by being longer than. In the air conditioner according to claim 1,
In the operation of the plurality of dehumidifying modes, the first dehumidifying operation in which substantially the entire indoor heat exchanger (11) is set as the evaporation region and the operation in which a part of the indoor heat exchanger (11) is set as the condensed region are performed. , Including the second dehumidification operation in which the remaining part of the indoor heat exchanger (11) is the evaporation area.
An air conditioner characterized in that the operating time of the internal drying operation after the first dehumidifying operation is shorter than the operating time of the internal drying operation after the second dehumidifying operation. In the air conditioner according to claim 4,
The operation of the plurality of dehumidifying modes includes a third dehumidifying operation in which a part of the indoor heat exchanger (11) is set as an evaporation region and the remaining part of the indoor heat exchanger (11) is set as a superheat region. ,
The operation time of the internal drying operation after the third dehumidifying operation is longer than the operating time of the internal drying operation after the first dehumidifying operation, and is longer than the operating time of the internal drying operation after the second dehumidifying operation. An air conditioner characterized by being short. In the air conditioner according to claim 3 or 5.
When the duration of the third dehumidifying operation is longer than the first predetermined time, the internal drying operation is performed after the third dehumidifying operation, and the internal drying operation is performed.
An air conditioner characterized in that when the duration of the second dehumidifying operation is longer than the second predetermined time, the internal drying operation is performed after the second dehumidifying operation.

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