JP6922954B2 - Air conditioning system - Google Patents

Description

Air conditioning system with cleaning mode for cleaning indoor heat exchangers

Conventionally, a humidifying unit that humidifies the room may be arranged outside the room. For example, the humidification unit described in Patent Document 1 (Japanese Unexamined Patent Publication No. 2018-71905) is arranged outdoors and has a hose that passes through a wall around the indoor space and communicates with the outdoor and the indoor. .. The humidification unit of Patent Document 1 dries the hose before humidification in order to prevent dew condensation water from accumulating in the hose and generating abnormal noise.

However, in the humidification unit of Patent Document 1, although the generation of abnormal noise in the hose can be reduced by drying the hose, the humidification delays the arrival of the target humidity in the room by the operating time spent for drying. Therefore, if an attempt is made to clean the indoor heat exchanger of the air-conditioning indoor unit after humidifying the room using the humidifying unit of Patent Document 1, the cleaning operation will be delayed.

An air conditioning system that cleans an indoor heat exchanger after humidifying the room with a humidifier that humidifies the room using a hose has a problem of shortening the time until the start of cleaning.

The air conditioning system of the first aspect includes an air conditioning indoor unit, a humidifier, and a control unit. The air-conditioning indoor unit has an indoor heat exchanger, and the indoor air is passed through the indoor heat exchanger to exchange heat of the indoor air. The humidifier has a hose that communicates with the room, and humidifies by sending moistened air with a hose. The control unit controls the air-conditioning indoor unit and the humidifier so as to perform indoor air conditioning in the normal mode and to perform a cleaning operation for cleaning the indoor heat exchanger after humidification in the cleaning mode. In the normal mode, the control unit controls the humidifier to perform the first drying operation of drying the hose before starting to send the moistened air. In the cleaning mode, the control unit is provided with moisture so as to start sending the moistened air without performing the operation of drying the hose, or by the second drying operation in which the operation time is shorter than the first drying operation. Control the humidifier to dry the hose before it begins to pump air.

In the air conditioning system of the first aspect, when the air with moisture is started to be sent without performing the operation of drying the hose, the time is shortened by the operation time of the first drying operation to speed up the cleaning operation. You can get started. Further, when the air conditioning system dries the hose before starting to send the air moistened by the second drying operation, the operation time of the second drying operation is shorter than that of the first drying operation, so that the time is shortened. And the cleaning operation can be started quickly.

The air-conditioning system of the second aspect is the air-conditioning system of the first aspect, and in the cleaning mode, the control unit performs a third drying operation of drying the hose after performing a cleaning operation of the indoor heat exchanger. Control the humidifier.

In the air conditioning system of the second aspect, the state of the hose after the cleaning operation can be kept good by drying the hose in the third drying operation after the cleaning operation.

The air-conditioning system of the third viewpoint is the air-conditioning system of the second viewpoint, the humidifier has a heater, and the control unit stops the function of giving moisture to the air in the third drying operation and uses the heater. Control the humidifier to allow heated air to pass through the hose.

In the air conditioning system of the third aspect, the inside of the hose can be dried by the heater of the humidifier, and the addition of equipment can be suppressed.

The air-conditioning system of the fourth aspect is any of the air-conditioning systems of the first to third aspects, and the humidifier has an adsorption member that adsorbs the moisture of the outside air and adsorbs to the air sent into the room by the hose. Moisture adsorbed from the outside air is applied by the member.

In the air-conditioning system of the fourth aspect, in the cleaning mode, the water supply work can be omitted by the suction member, and the labor at the time of cleaning can be saved.

The air-conditioning system of the fifth viewpoint is any of the air-conditioning systems of the first to fourth viewpoints, and the control unit controls the humidifier to perform humidification in the cleaning mode, and then the indoor heat exchanger. The air-conditioning indoor unit is controlled so as to perform a cleaning operation in which dew condensation water is generated on the surface and the surface is washed with the dew condensation water.

The air-conditioning system of the fifth viewpoint is sufficient to raise the humidity in the room by humidifying the cleaning mode even when the room becomes dry due to weather conditions and the situation arises that is unsuitable for cleaning the indoor heat exchanger. The cleaning operation can be performed with condensed water.

The conceptual diagram which shows an example of the structure of the air-conditioning system which concerns on embodiment. The cross-sectional view which shows an example of the structure of the air-conditioning indoor unit of an air-conditioning system. The figure for demonstrating the refrigerant circuit and the air flow path which the air conditioning system of FIG. 1 has. The exploded perspective view which shows the structural example of the air conditioner outdoor unit and a humidifier of FIG. The block diagram for demonstrating the structure of the air conditioning system of FIG. The figure for demonstrating the operation of each device in the 1st dehumidifying operation, the 2nd dehumidifying operation and the 3rd dehumidifying operation. A flowchart for explaining the operation of the air conditioning system. A timing chart for comparing the humidification operation in the normal mode and the operation in the cleaning mode. The flowchart which shows the operation example of the control part at the time of automatically shifting to a cleaning mode. A timing chart for comparing the humidification operation in the normal mode and the operation in the cleaning mode of the modified example. A flowchart for explaining another example of the operation of the air conditioning system.

(1) Outline of Configuration of Air Conditioning System 1 As shown in FIG. 1, the air conditioning system 1 according to the embodiment includes an air conditioning indoor unit 2 and a humidifier 6. As shown in FIGS. 3 and 5, the air conditioning system 1 includes a control unit 8 that controls the air conditioning indoor unit 2. The air-conditioning indoor unit 2 is installed in the room RM (see FIG. 1) to harmonize the air inside the room RM (indoor). In the embodiment, a case where the air conditioner indoor unit 2 is attached to the wall WL of the room RM and installed will be described. However, the type of the air conditioner indoor unit 2 is not limited to the type installed on the wall WL of the room RM. The air-conditioning indoor unit 2 may be installed on the ceiling CE or the floor FL, for example.

As shown in FIG. 2, the air-conditioning indoor unit 2 has an indoor heat exchanger 21. The air-conditioning indoor unit 2 exchanges heat with the indoor air by passing the indoor air (air in the room RM) through the indoor heat exchanger 21. The indoor heat exchanger 21 has a plurality of heat transfer fins 21a and a plurality of heat transfer tubes 21b. The indoor air passes between the plurality of heat transfer fins 21a. Further, during heat exchange, air passes between the plurality of heat transfer fins 21a, and at the same time, the refrigerant flows through the heat transfer tubes 21b. The heat transfer tube 21b is folded a plurality of times and penetrates one heat transfer fin 21a a plurality of times.

The air conditioning system 1 includes a humidifier 6 shown in FIGS. 1 and 3 in addition to the air conditioning indoor unit 2. The humidifier 6 has an intake / exhaust hose 68 that communicates with the room. The humidifier 6 supplies moisture to the inside (indoor) of the room RM by an intake / exhaust hose 68 to perform humidification to raise the humidity in the room.

As shown in FIGS. 3 and 5, the air conditioning system 1 includes a control unit 8 that controls the air conditioning indoor unit 2 and the humidifier 6. The air conditioning system 1 has a normal mode and a cleaning mode as operation modes. In the normal mode, the control unit 8 controls the air conditioning indoor unit 2 so as to harmonize the air in the room. In the normal mode, the control unit 8 controls the humidifier 6 so as to perform a first drying operation (see FIG. 8) for drying the intake / exhaust hose 68 before starting to send the moistened air.

In the cleaning mode, the control unit 8 controls the air conditioning indoor unit 2 so as to clean the indoor heat exchanger 21 after humidification. Further, in the cleaning mode, the humidifier 6 is controlled for cleaning the indoor heat exchanger 21. In the cleaning mode, the control unit 8 controls the humidifier 6 so as to start sending the moistened air without performing the operation of drying the intake / exhaust hose 68. Alternatively, in the cleaning mode, the control unit 8 dries the intake / exhaust hose 68 before starting to send the moistened air by the second drying operation (see FIG. 10), which has a shorter operation time than the first drying operation. In addition, the humidifier 6 is controlled.

The control unit 8 is realized by, for example, a microcomputer. The control unit 8 includes, for example, a control arithmetic unit 81b and a storage device 81c. A processor such as a CPU or GPU can be used for the control arithmetic unit 81b. The control arithmetic unit 81b reads a program stored in the storage device 81c, and performs, for example, predetermined sequence processing and arithmetic processing according to this program. Further, the control arithmetic unit 81b can write the arithmetic result in the storage device 81c and read the information stored in the storage device 81c according to the program. The storage device 81c can be used as a database.

In the air conditioning system 1, the intake / exhaust hose 68 is dried when the intake / exhaust hose 68 is not operated to dry and the air with moisture is started to be sent, or before the air with moisture is started to be sent by the second drying operation. If this is the case, the time can be shortened and the cleaning operation can be started earlier.

(2) Detailed configuration (2-1) Overall configuration The air conditioner indoor unit 2 is included in the air conditioner 10 of the air conditioning system 1. In addition to the air conditioner indoor unit 2, the air conditioner 10 has an air conditioner outdoor unit 4 and a remote controller 15 shown in FIGS. 1 and 2. The air conditioner indoor unit 2 and the air conditioner outdoor unit 4 are connected by refrigerant connecting pipes 11 and 12. The air conditioner indoor unit 2, the air conditioner outdoor unit 4, and the refrigerant connecting pipes 11 and 12 form a refrigerant circuit 13. The air conditioner indoor unit 2 and the air conditioner outdoor unit 4 are controlled by the control unit 8. In the refrigerant circuit 13, for example, the vapor compression refrigeration cycle is repeated during the cooling operation, the heating operation, and the dehumidifying operation.

(2-2) Detailed configuration (2-2-1) Air conditioner indoor unit 2
As shown in FIGS. 2, 3 and 5, the air conditioning indoor unit 2 includes an indoor heat exchanger 21, an indoor fan 22, a casing 23, an air filter 24, a drain pan 26, and a horizontal flap 27. , A vertical flap (not shown), and a discharge unit 29. Further, the air-conditioning indoor unit 2 includes an indoor temperature sensor 31, an indoor humidity sensor 32, a duct temperature sensor 33, a duct humidity sensor 34, and an indoor heat exchanger temperature sensor 35.

In the following description, the directions may be described using the expressions "up", "down", "front", and "rear" according to the directions indicated by the arrows in FIGS. 1 and 2.

The casing 23 has a suction port 23a at the upper part and an outlet 23b at the lower part. The air-conditioning indoor unit 2 drives the indoor fan 22 to suck in the indoor air from the suction port 23a and blow out the air that has passed through the indoor heat exchanger 21 from the air outlet 23b.

The indoor fan 22 is arranged at a substantially central portion in the casing 23 in a cross-sectional view of the air conditioner indoor unit 2 (see FIG. 2). The indoor fan 22 is, for example, a cross flow fan. The indoor heat exchanger 21 is arranged upstream of the indoor fan 22 in the air flow path from the suction port 23a to the air outlet 23b. The indoor heat exchanger 21 has a shape that opens downward so as to cover the upper part of the indoor fan 22 when viewed in the extending direction of the heat transfer tube 21b. Here, such a shape is referred to as a substantially Λ shape. The indoor heat exchanger 21 has a first heat exchange section 21F far from the wall WL and a second heat exchange section 21R close to the wall WL.

The drain pan 26 is arranged under the lower front portion and the lower rear portion of the indoor heat exchanger 21 having a substantially Λ shape. Condensation generated in the first heat exchange section 21F of the indoor heat exchanger 21 is received by the drain pan 26 arranged in the lower front part of the indoor heat exchanger 21. Condensation generated in the second heat exchange section 21R of the indoor heat exchanger 21 is received by the drain pan 26 arranged in the lower rear part of the indoor heat exchanger 21.

A horizontal flap 27 and a vertical flap are arranged at the air outlet 23b. The horizontal flap 27 changes the wind direction of the air blown out from the outlet 23b up and down. Therefore, the horizontal flap 27 is configured so that the angle formed with the horizontal direction can be changed by the motor 27m. The vertical flap is configured so that the direction of the air blown from the outlet 23b can be changed to the left or right. The air conditioning system 1 drives, for example, a vertical flap by a motor (not shown) so as to change the angle formed by the front-rear direction.

An air filter 24 is arranged downstream of the suction port 23a in the casing 23 and upstream of the indoor heat exchanger 21. The air filter 24 is installed in the casing 23 so that substantially all the indoor air supplied to the indoor heat exchanger 21 passes through the air filter 24. Therefore, dust larger than the mesh of the air filter 24 is removed by the air filter 24 and does not reach the indoor heat exchanger 21. However, dust and oil mist finer than the mesh of the air filter 24 and the like that pass through the air filter 24 reach the indoor heat exchanger 21.

The discharge unit 29 is an active species generating device configured to have a discharge unit inside. The discharge unit includes, for example, a needle-shaped electrode and a counter electrode, and a streamer discharge, which is a type of plasma discharge, is generated by applying a high voltage. Active species with high oxidative decomposition power are generated when a discharge occurs. These active species include, for example, fast electrons, ions, hydroxide radicals and excited oxygen molecules. The active species decomposes harmful components and odorous components in the air composed of small organic molecules such as ammonia, aldehydes and nitrogen oxides. The discharge unit 29 is arranged, for example, upstream of the air filter 24 or upstream of the indoor heat exchanger 21.

An indoor control plate 81 constituting the control unit 8 is arranged in the air conditioner indoor unit 2. As shown in FIG. 5, the indoor control plate 81 is connected to the motor 22 m of the indoor fan 22, the motor 27 m of the horizontal flap 27, and the solenoid valve 28. The control unit 8 can control the rotation speed of the motor 22m of the indoor fan 22, the rotation angle of the motor 27m of the horizontal flap, and the on / off of the solenoid valve 28 by the indoor control plate 81. The indoor control plate 81 has a timer 81a, a control arithmetic unit 81b, and a storage device 81c. The indoor control plate 81 is connected to an outdoor control plate 82 (see FIGS. 3 and 5) arranged in the air conditioner outdoor unit 4. Here, the case where the indoor control plate 81 has the timer 81a, the control arithmetic unit 81b, and the storage device 81c will be described. However, the timer 81a, the control arithmetic unit 81b, and the storage device 81c are other than the control unit 8. It may be provided in the place of. For example, the timer 81a, the control arithmetic unit 81b, and the storage device 81c may be provided on the outdoor control plate 82.

The control unit 8 receives the signal from the remote controller 15 by the indoor control plate 81, and receives the instruction input from the remote controller 15. The remote controller 15 has a display screen 15a. The control unit 8 can display various information on the display screen 15a of the remote controller 15. The control unit 8 can use, for example, the display screen 15a to notify that the cleaning operation cannot be performed.

3 and 5 show the indoor temperature sensor 31, the indoor humidity sensor 32, the duct temperature sensor 33, the duct humidity sensor 34, and the indoor heat exchanger temperature sensor among the sensors included in the air conditioning indoor unit 2. 35 is shown. These sensors included in the air conditioner indoor unit 2 are connected to the indoor control plate 81. Therefore, the control unit 8 can detect the temperature of the indoor air by the indoor temperature sensor 31, and can detect the relative humidity of the indoor air by the indoor humidity sensor 32. The control unit 8 can detect the temperature of the air blown from the humidifier 6 to the air conditioning indoor unit 2 by the duct temperature sensor 33, and the air blown from the humidifier 6 to the air conditioning indoor unit 2 by the duct humidity sensor 34. Relative humidity can be detected. Further, the control unit 8 can detect the temperature of the refrigerant flowing in a specific place of the indoor heat exchanger 21 by the indoor heat exchanger temperature sensor 35. This specific location is, for example, the location of the heat transfer tube 21b to which the indoor heat exchanger temperature sensor 35 is attached.

As shown in FIG. 3, the indoor heat exchanger 21 has a solenoid valve 28. The refrigerant flowing from the outdoor expansion valve 45 to the other inlet / outlet of the indoor heat exchanger 21 flows from the first heat exchange section 21F through the solenoid valve 28 to the second heat exchange section 21R. On the contrary, the refrigerant flowing from the fourth port P4 of the four-way valve 42 to one inlet / outlet of the indoor heat exchanger 21 flows from the second heat exchange section 21R through the solenoid valve 28 to the first heat exchange section 21F. The solenoid valve 28 is a valve that sets a differential pressure between the first heat exchange unit 21F and the second heat exchange unit 21R. Here, the case where the solenoid valve 28 is used will be described, but another control valve such as an electric valve capable of changing the valve opening degree may be used. The solenoid valve 28 is set so that the opening degree is smaller when it is in the on state than when it is in the off state. In other words, the solenoid valve 28 increases the differential pressure between the first heat exchange unit 21F and the second heat exchange unit 21R when it is in the ON state.

(2-2-2) Air conditioner outdoor unit 4
As shown in FIGS. 3 and 5, the air conditioner outdoor unit 4 includes a compressor 41, a four-way valve 42, an accumulator 43, an outdoor heat exchanger 44, an outdoor expansion valve 45, an outdoor fan 46, and a casing 47. ing. The compressor 41, the four-way valve 42, the accumulator 43, the outdoor heat exchanger 44, the outdoor expansion valve 45, and the outdoor fan 46 are housed in the casing 47. The casing 47 has a suction port 47a (see FIG. 3) for sucking in outdoor air and an outlet 47b (see FIGS. 1 and 3) for blowing out the air after heat exchange. The suction port 47a is arranged on the rear side of the casing 47. The air conditioner outdoor unit 4 functions as a heat source unit that supplies heat energy to the air conditioner indoor unit 2.

The compressor 41 sucks in the gas refrigerant, compresses it, and discharges it. The compressor 41 is, for example, a variable displacement compressor whose operating capacity can be changed by adjusting the operating frequency of the motor 41 m with an inverter. The larger the operating frequency, the larger the operating capacity of the compressor 41. The four-way valve 42 has four ports. The first port P1 of the four-way valve 42 is connected to the discharge port of the compressor 41. The second port P2 of the four-way valve 42 is connected to one inlet / outlet of the outdoor heat exchanger 44. The third port P3 of the four-way valve 42 is connected to the accumulator 43. The fourth port P4 of the four-way valve 42 is connected to one entrance / exit of the indoor heat exchanger 21.

The accumulator 43 is connected between the third port P3 of the four-way valve 42 and the suction port of the compressor 41. The outdoor heat exchanger 44 connects the other inlet / outlet to one inlet / outlet of the outdoor expansion valve 45. The outdoor heat exchanger 44 exchanges heat between the refrigerant that has flowed into the inside from one inlet / outlet or the other inlet / outlet and the outdoor air. The outdoor expansion valve 45 connects the other inlet / outlet to the other inlet / outlet of the indoor heat exchanger 21.

An outdoor control plate 82 constituting the control unit 8 is arranged in the air conditioner outdoor unit 4. The outdoor control plate 82 is connected to the indoor control plate 81. The outdoor control plate 82 is connected to the motor 41 m of the compressor 41, the four-way valve 42, and the motor 46 m of the outdoor fan 46. The control unit 8 can control the operating frequency of the motor 41 m of the compressor 41, the opening degree of the four-way valve 42, and the rotation speed of the motor 46 m of the outdoor fan 46 by the outdoor control plate 82.

3 and 5 show an outside air temperature sensor 51, a discharge pipe temperature sensor 52, and an outdoor heat exchanger temperature sensor 53 among the sensors included in the air conditioner outdoor unit 4. These sensors included in the air conditioner outdoor unit 4 are connected to the outdoor control plate 82. Therefore, the control unit 8 can detect the temperature of the outdoor air by the outside air temperature sensor 51. Further, the control unit 8 can detect the temperature of the refrigerant flowing through the discharge pipe (refrigerant pipe connected to the discharge port of the compressor 41) by the discharge pipe temperature sensor 52, and the outdoor heat exchanger temperature sensor 53 can detect the temperature of the refrigerant. The temperature of the refrigerant flowing in 44 specific places can be detected. When controlling the refrigeration cycle, the control unit 8 monitors the state of the refrigerant in the refrigerant circuit 13 by means of the discharge pipe temperature sensor 52, the outdoor heat exchanger temperature sensor 53, the indoor heat exchanger temperature sensor 35, and the like.

The refrigerant circuit 13 includes a compressor 41, a four-way valve 42, an accumulator 43, an outdoor heat exchanger 44, an outdoor expansion valve 45, and an indoor heat exchanger 21. Refrigerant circulates in the refrigerant circuit 13. Examples of the refrigerant include fluorocarbons such as R32 refrigerant and R410 refrigerant, carbon dioxide and the like.

In the vapor compression refrigeration cycle, the refrigerant is compressed by the compressor 41 to raise the temperature, and then the refrigerant dissipates heat in the outdoor heat exchanger 44 or the indoor heat exchanger 21. Further, in the vapor compression refrigeration cycle, the refrigerant is decompressed and expanded by the outdoor expansion valve 45, and then the refrigerant is endothermic by the indoor heat exchanger 21 or the outdoor heat exchanger 44. In the accumulator 43, gas-liquid separation of the refrigerant sucked into the compressor 41 is performed. The four-way valve 42 switches the direction of the refrigerant flow in the refrigerant circuit 13.

(2-2-3) Humidifier 6
The humidifier 6 of the embodiment is integrated with the air conditioning outdoor unit 4. The humidifier 6 takes in moisture from the outdoor air. The humidifier 6 generates high-humidity air by applying the taken-in moisture to the outdoor air. The humidifier 6 sends this high humidity air to the air conditioning indoor unit 2. At the time of humidification, the air conditioning system 1 mixes the high humidity air sent from the humidifier 6 with the indoor air in the air conditioning indoor unit 2. The air-conditioning indoor unit 2 humidifies the room by blowing out air mixed with high-humidity air into the room RM (indoor). The humidifier 6 is controlled by the control unit 8.

As shown in FIG. 4, the humidifier 6 includes a suction rotor 61, a heater 62, a switching damper 63, an intake / exhaust fan 64, a suction fan 65, a duct 66, and a casing 69. There is. Further, the humidifier 6 includes an intake / exhaust hose 68. As shown in FIGS. 1 and 4, the casing 69 of the humidifier 6 is attached to and integrated with the casing 47 of the air conditioning outdoor unit 4. The humidifier 6 has an adsorption air outlet 69a, an adsorption air intake 69b, and a humidifying air intake 69c in the casing 69.

The suction rotor 61 is, for example, a disk-shaped ceramic rotor having a honeycomb structure. The ceramic rotor can be formed, for example, by firing an adsorbent. The adsorbent has the property of adsorbing the moisture in the air that comes into contact with it. Further, the adsorbent has a property of desorbing the adsorbed water by being heated. Such adsorbents include, for example, zeolite, silica gel and alumina. The suction rotor 61 is driven by a motor 61 m and rotates. The rotation speed of the suction rotor 61 can be changed by changing the rotation speed of the motor 61m.

The heater 62 is arranged between the humidifying air intake 69c and the switching damper 63. The outdoor air taken in from the humidifying air intake 69c passes through the heater 62, then further passes through the suction rotor 61, and reaches the switching damper 63. When the air heated by the heater 62 passes through the adsorption rotor 61, the moisture is desorbed from the adsorption rotor 61, and the moisture is supplied to the heated air from the adsorption rotor 61. The output of the heater 62 can be changed, and the temperature of the air passing through the heater 62 can be changed according to the output. Within a specific temperature range, the suction rotor 61 tends to desorb a large amount of water as the temperature of the air passing through the suction rotor 61 increases.

The switching damper 63 has a first entrance / exit 63a and a second entrance / exit 63b. The switching damper 63 can switch whether the inlet of the air that sucks air when the intake / exhaust fan 64 is driven is the first inlet / outlet 63a or the second inlet / outlet 63b. When the air inlet is the first inlet / outlet 63a, the outdoor air flows from the humidifying air intake port 69c in the direction of the arrow shown by the solid line in FIG. 3, the suction rotor 61, the heater 62, and the suction rotor 61. , The first inlet / outlet 63a, the intake / exhaust fan 64, the second inlet / outlet 63b, the duct 66, the intake / exhaust hose 68, and the air conditioning indoor unit 2 flow in this order. When the air inlet is switched to the second inlet / outlet 63b, conversely, the intake / exhaust hose 68, the duct 66, the second inlet / outlet 63b, from the air conditioning indoor unit 2 in the direction of the arrow shown by the broken line in FIG. Air flows in the order of the intake / exhaust fan 64, the first inlet / outlet 63a, the suction rotor 61, the heater 62, the suction rotor 61, and the humidifying air intake port 69c. The switching damper 63 is switched by the motor 63m.

The intake / exhaust fan 64 is arranged between the first entrance / exit 63a and the second entrance / exit 63b of the switching damper 63. The intake / exhaust fan 64 generates an air flow from the first inlet / outlet 63a to the second inlet / outlet 63b or from the second inlet / outlet 63b to the first inlet / outlet 63a. The intake / exhaust fan 64 is driven by a motor 64 m.

One end of the intake / exhaust hose 68 is connected to the duct 66, and the other end is connected to the air conditioning indoor unit 2. With such a configuration, the intake / exhaust hose 68 and the room RM communicate with each other via the air conditioning indoor unit 2.

The suction fan 65 is arranged in a passage leading from the suction air intake 69b to the suction air outlet 69a. A suction rotor 61 is arranged in this passage so that the suction rotor 61 can be hooked. When the suction fan 65 generates an air flow from the suction air intake 69b toward the suction air outlet 69a, moisture is adsorbed from the outdoor air passing through the suction rotor 61 to the suction rotor 61. The suction fan 65 is driven by a motor 65 m.

The motor 61m of the suction rotor 61, the motor 63m of the switching damper 63, the motor 64m of the intake / exhaust fan 64, and the heater 62 are connected to the outdoor control plate 82. The control unit 8 can control the rotation speed of the suction rotor 61, the switching of the switching damper 63, the on / off of the intake / exhaust fan 64 and the suction fan 65, and the output of the heater 62 by the outdoor control plate 82. Of the sensors included in the air conditioning indoor unit 2, the outside air humidity sensor 71 is shown in FIGS. 3 and 5. The outside air humidity sensor 71 is connected to the outdoor control plate 82. The control unit 8 can detect the relative humidity of the outdoor air by the outside air humidity sensor 71.

(2-3) Operation of air conditioning system 1 (2-3-1) Operation in normal mode The operation of the air conditioning system 1 in normal mode includes, for example, cooling operation, heating operation, dehumidifying operation, humidifying operation, ventilation operation, and ventilation. There is operation and air cleaning operation. Here, the operation in the normal mode is an operation other than the operation in the cleaning mode. The operation in the normal mode is not limited to the above-mentioned cooling operation and heating operation. Further, in the above-mentioned normal mode, a plurality of operations may be combined, such as a combination of a heating operation and a humidification operation.

(2-3-1-1) Cooling operation Before the start of the cooling operation, the control unit 8 is instructed by, for example, the remote controller 15 to perform the cooling operation and the target temperature. During the cooling operation, the control unit 8 switches the four-way valve 42 to the state shown by the solid line in FIG. During the cooling operation, the four-way valve 42 causes the refrigerant to flow between the first port P1 and the second port P2, and the refrigerant to flow between the third port P3 and the fourth port P4. The four-way valve 42 during the cooling operation causes the high-temperature and high-pressure gas refrigerant discharged from the compressor 41 to flow through the outdoor heat exchanger 44. In the outdoor heat exchanger 44, heat exchange is performed between the refrigerant and the outdoor air supplied by the outdoor fan 46. The refrigerant cooled by the outdoor heat exchanger 44 is decompressed by the outdoor expansion valve 45 and flows into the indoor heat exchanger 21. In the indoor heat exchanger 21, heat exchange is performed between the refrigerant and the indoor air supplied by the indoor fan 22. The refrigerant warmed by the heat exchange in the indoor heat exchanger 21 is sucked into the compressor 41 via the four-way valve 42 and the accumulator 43. The indoor air cooled by the indoor heat exchanger 21 is blown out from the air conditioner indoor unit 2 to the room RM to cool the room. In the air conditioner 10, in the cooling operation, the indoor heat exchanger 21 functions as a refrigerant evaporator to warm the indoor air in the room RM, and the outdoor heat exchanger 44 functions as a refrigerant radiator.

(2-3-1-2) Heating operation Before the start of the heating operation, the control unit 8 is instructed by, for example, the remote controller 15 to perform the heating operation and the target temperature. During the heating operation, the control unit 8 switches the four-way valve 42 to the state shown by the broken line in FIG. During the heating operation, the four-way valve 42 causes the refrigerant to flow between the first port P1 and the fourth port P4, and flows the refrigerant between the second port P2 and the third port P3. The four-way valve 42 during the heating operation causes the high-temperature and high-pressure gas refrigerant discharged from the compressor 41 to flow through the indoor heat exchanger 21. In the indoor heat exchanger 21, heat exchange is performed between the refrigerant and the indoor air supplied by the indoor fan 22. The refrigerant cooled by the indoor heat exchanger 21 is decompressed by the outdoor expansion valve 45 and flows into the outdoor heat exchanger 44. In the outdoor heat exchanger 44, heat exchange is performed between the refrigerant and the indoor air supplied by the outdoor fan 46. The refrigerant warmed by the heat exchange in the outdoor heat exchanger 44 is sucked into the compressor 41 via the four-way valve 42 and the accumulator 43. The indoor air heated by the indoor heat exchanger 21 is blown out from the air-conditioning indoor unit 2 to the room RM to heat the room. In the air conditioner 10, in the heating operation, the indoor heat exchanger 21 functions as a refrigerant radiator to warm the indoor air in the room RM, and the outdoor heat exchanger 44 functions as a refrigerant evaporator.

(2-3-1-3) Dehumidifying operation Before the start of the dehumidifying operation, the control unit 8 is instructed to perform the dehumidifying operation, for example, from the remote controller 15. Here, a case where a plurality of modes can be selected in the dehumidifying operation will be described. Information on which mode of the first dehumidification mode, the second dehumidification mode, and the third dehumidification mode is selected is transmitted from the remote controller 15 to the control unit 8. In the first dehumidification mode, the first dehumidification operation is performed so that substantially the entire indoor heat exchanger 21 is in the evaporation region. In the second dehumidification mode, a second dehumidification operation is performed in which a part of the indoor heat exchanger 21 is set to an evaporation region and the remaining part of the indoor heat exchanger 21 is set to a superheat zone. In the third dehumidification mode, in the indoor heat exchanger 21, a third dehumidification operation is performed in which the portion upstream of the solenoid valve 28 is the condensation region, while the portion downstream of the solenoid valve 28 is the evaporation region.

During the dehumidifying operation, the control unit 8 switches the four-way valve 42 to the state shown by the solid line in FIG. During the dehumidifying operation, the four-way valve 42 causes the refrigerant to flow between the first port P1 and the second port P2, and the refrigerant to flow between the third port P3 and the fourth port P4. Therefore, in the refrigerant circuit 13, the direction in which the refrigerant flows is the same during the dehumidifying operation and the cooling operation. The refrigeration cycle is also carried out in the refrigerant circuit 13 of the dehumidifying operation.

(1st dehumidifying operation)
In the first dehumidifying operation, when the refrigerant circulates in the refrigerant circuit 13, the control unit 8 turns off the solenoid valve 28 and adjusts the operating frequency of the compressor 41 and the opening degree of the outdoor expansion valve 45. In the first dehumidification operation, substantially the entire indoor heat exchanger 21 is set as the evaporation region. As a result, the first dehumidifying operation has a high sensible heat capacity, which is the ability to change the room temperature.

Here, to make substantially all of the indoor heat exchanger 21 an evaporation region is not only when the entire indoor heat exchanger 21 is made into an evaporation region, but also only a part of the indoor heat exchanger 21 excluding a part. Including when making the evaporation area. When only a part of this (for example, a part of 1/3 or less of the total volume of the indoor heat exchanger 21) does not become an evaporation region, for example, a part near the refrigerant outlet of the indoor heat exchanger 21 depending on the indoor environment or the like. Is sometimes overheated.

(Second dehumidifying operation)
In the second dehumidifying operation, when the refrigerant circulates in the refrigerant circuit 13, the control unit 8 turns off the solenoid valve 28 and adjusts the operating frequency of the compressor 41 and the opening degree of the outdoor expansion valve 45. In the second dehumidification operation, a part of the first heat exchange section 21F is set as an evaporation region, while the remaining portion of the first heat exchange section 21F and the second heat exchange section 21R are set as a superheat zone. The control unit 8 controls the compressor 41 and the outdoor expansion valve 45 so that the evaporation area becomes a predetermined volume (for example, 2/3 of the total volume of the indoor heat exchanger 21) or less during the second dehumidification operation. The evaporation temperature of the second dehumidification operation is set to be lower than the evaporation temperature of the first dehumidification operation. At this time, the opening degree of the outdoor expansion valve 45 is usually smaller than the opening degree of the outdoor expansion valve 45 during the first dehumidifying operation. Since the second dehumidifying operation has a lower sensible heat capacity than the first dehumidifying operation, it is possible to dehumidify the room while suppressing a decrease in room temperature when the heat load in the room is neither high nor low.

(Third dehumidifying operation)
In the third dehumidifying operation, when the refrigerant circulates in the refrigerant circuit 13, the control unit 8 turns on the solenoid valve 28 and adjusts the operating frequency of the compressor 41 and the opening degree of the outdoor expansion valve 45. In the third dehumidifying operation, by turning on the solenoid valve 28, the valve opening degree becomes smaller than that in the first dehumidifying operation and the second dehumidifying operation. In the third dehumidification operation, the first heat exchange unit 21F is set to the condensation region, while the second heat exchange unit 21R is set to the evaporation region. The control unit 8 is performed so that the evaporation temperature of the third dehumidification operation is lower than the evaporation temperature of the second dehumidification operation. At this time, the opening degree of the outdoor expansion valve 45 is fixed to an opening degree larger than the maximum opening degree of the outdoor expansion valve 45 during the second dehumidifying operation. Since the third dehumidifying operation has a lower sensible heat capacity than the second dehumidifying operation, it is possible to dehumidify the room while suppressing a decrease in room temperature when the heat load in the room is low.

(Example of operating conditions for dehumidifying operation)
FIG. 6 shows examples of operating conditions of the first dehumidifying operation, the second dehumidifying operation, and the third dehumidifying operation. The control unit 8 controls the outdoor fan 46 so that the control range of the rotation speed of the outdoor fan 46 during the third dehumidification operation is wider than the control range of the rotation speed of the outdoor fan 46 during the second dehumidification operation. .. The upper limit of the rotation speed of the outdoor fan 46 during the third dehumidifying operation is higher than the upper limit of the rotation speed of the outdoor fan 46 during the second dehumidifying operation. As a result, the evaporation temperature of the refrigerant during the third dehumidification operation can be lower than the evaporation temperature of the refrigerant during the second dehumidification operation. Therefore, when the room is dehumidified by the third dehumidifying operation, the dehumidifying efficiency can be increased. The upper limit of the rotation speed of the outdoor fan 46 during the second dehumidifying operation is set to, for example, 840 rpm. The upper limit of the rotation speed of the outdoor fan 46 during the third dehumidifying operation is set to, for example, 970 rpm.

Further, the lower limit of the rotation speed of the outdoor fan 46 during the third dehumidification operation is lower than the lower limit of the rotation speed of the outdoor fan 46 during the second dehumidification operation. As a result, it is possible to prevent the pressure of the refrigerant between the outdoor heat exchanger 44 and the indoor heat exchanger 21 from being excessively lowered during the third dehumidifying operation. Therefore, when the room is dehumidified by the third dehumidifying operation, the occurrence of the choke phenomenon can be suppressed. The lower limit of the rotation speed of the outdoor fan 46 during the second dehumidifying operation is set to, for example, 510 rpm. The lower limit of the rotation speed of the outdoor fan 46 during the third dehumidifying operation is set to, for example, 150 rpm.

The opening degree of the outdoor expansion valve 45 is adjusted by a pulse signal. The number of pulses (pls) of this pulse signal is proportional to the opening degree of the outdoor expansion valve 45. As the number of pulses increases, the opening degree of the outdoor expansion valve 45 increases.

(2-3-1-4) Humidification operation Before the start of the humidification operation, the control unit 8 is instructed by, for example, the remote controller 15 to perform the humidification operation and the target humidity. During the humidification operation, the control unit 8 stops the compressor 41 and stops the refrigeration cycle in the refrigerant circuit 13. However, in the humidification / heating operation, the refrigeration cycle in the refrigerant circuit 13 is also carried out at the same time as the humidification operation.

Upon receiving the instruction of the humidification operation, the control unit 8 first controls the humidifier 6 so as to perform the first drying operation for drying the intake / exhaust hose 68. In the first drying operation, the control unit 8 stops the suction fan 65 and the suction rotor 61. In the first drying operation, the control unit 8 heats the air in the heater 62, switches the switching damper 63 so as to generate an air flow from the first inlet / outlet 63a to the second inlet / outlet 63b, and drives the intake / exhaust fan 64. The outdoor air taken in from the humidifying air intake 69c is heated by the heater 62 and the temperature rises, so that the relative humidity decreases. Since the suction rotor 61 is stopped, moisture is not supplied to the air passing through the suction rotor 61. The intake / exhaust fan 64 passes the dried air through the intake / exhaust hose 68 to dry the intake / exhaust hose 68. For example, the control unit 8 counts the operation time with the timer 81a, and when the operation time reaches a predetermined time, the control unit 8 ends the first drying operation.

The humidification operation is started after the completion of the first drying operation. When the first drying operation is completed, the control unit 8 controls to drive the suction fan 65 and rotate the suction rotor 61. By driving the suction fan 65, the outdoor air passes through the suction rotor 61, so that the suction rotor 61 is attracted to moisture from the outdoor air. The location where the moisture is adsorbed moves to a location where the air heated by the heater 62 passes by the rotation of the adsorption rotor 61. As a result, the moisture is desorbed from the place where the moisture is adsorbed to the heated air. The air having a high humidity in this way is sent to the room RM by the intake / exhaust fan 64 through the intake / exhaust hose 68 and the air conditioning indoor unit 2. The control unit 8 drives the indoor fan 22 of the air-conditioning indoor unit 2 in order to blow out high-humidity air into the room RM.

(2-3-1-5) Blower operation Before the start of the blower operation, the control unit 8 is instructed to perform the blower operation by, for example, the remote controller 15. During the ventilation operation, the control unit 8 stops the compressor 41 and stops the refrigeration cycle in the refrigerant circuit 13. In the ventilation operation, the remote controller 15 may instruct the target air volume, or the air conditioner indoor unit 2 may automatically select the target air volume. The control unit 8 controls the motor 22m of the indoor fan 22 so that the target air volume is reached. For example, in the normal mode, the control unit 8 is configured to increase the rotation speed in the order of the L tap, the M tap, and the H tap from the LL tap having the lowest rotation speed.

(2-3-1-6) Ventilation operation Before the start of the ventilation operation, the control unit 8 is instructed to perform the ventilation operation by, for example, the remote controller 15. During the ventilation operation, the control unit 8 stops the compressor 41 and stops the refrigeration cycle in the refrigerant circuit 13. In addition, during the ventilation operation, the humidification operation is also stopped. In order to stop the humidification operation, the rotation of the suction fan 65 and the suction rotor 61 is stopped. In the ventilation operation, the control unit 8 controls the motor 64m so as to drive the intake / exhaust fan 64. Further, in the ventilation operation, the control unit 8 switches between the air supply state and the exhaust state by controlling the switching damper 63. In the air supply state, the outdoor air is taken in from the humidifying air intake port 69c and blown out to the room RM through the intake / exhaust hose 68 and the air conditioning indoor unit 2. In the exhaust state, the air in the room is exhausted from the room RM through the air conditioning indoor unit 2 and the intake / exhaust hose 68 from the humidifying air intake port 69c.

(2-3-1-7) Air Purifying Operation The air conditioning system 1 of the embodiment performs an air cleaning operation using the discharge unit 29. Here, the air cleaning operation is an operation of suppressing harmful components and / or odor components in the air. The air cleaning operation is, for example, an operation in which harmful components and / or odor components are suppressed by the decomposing power of streamer discharge.

(2-3-2) Operation in cleaning mode The operation in cleaning mode will be described with reference to the flowchart of FIG. When the cleaning mode is started, when the control unit 8 is instructed to start the operation in the cleaning mode (in the case of manual start), the control unit 8 automatically determines the start of the operation in the cleaning mode. There is a case (in the case of automatic start). The air conditioning system 1 of the embodiment corresponds to both the case of manual start and the case of automatic start. However, the air conditioning system 1 can also be configured to support either the manual start case or the automatic start case.

When the control unit 8 is instructed to perform the cleaning mode (Yes in step ST1), the operation of the cleaning mode is started. As a case of manual start, for example, a cleaning mode start button for instructing the cleaning mode of the remote controller 15 may be pressed. Further, even if there is no instruction of the cleaning mode (No in step ST1), if the control unit 8 determines that the condition for starting the operation in the cleaning mode is satisfied (Yes in step ST2), the operation in the cleaning mode is started. .. The conditions for shifting to the cleaning mode in step ST2 will be described later.

When the operation in the cleaning mode is started, the control unit 8 controls the motor 27m so as to open the horizontal flap 27 and fix it at a predetermined angle (step ST3). The angle of the horizontal flap 27 is preferably an angle at which the air blown out from the air conditioning indoor unit 2 does not directly hit the person even if there is a person in the room RM. Further, the control unit 8 controls the discharge unit 29 so as to start the streamer discharge when the operation in the cleaning mode is started (step ST3). Regarding the process of step ST3, if the horizontal flap 27 has already been opened, it is maintained. Further, regarding the process of step ST3, when the streamer discharge has already been started, the state in which the streamer discharge is being performed is maintained. The streamer discharge ends with the end of the wash mode operation. When the streamer discharge is performed in the cleaning operation, the air conditioning system 1 can clean the indoor heat exchanger 21. However, the air conditioning system 1 can also be configured so as to stop the discharge of the discharge unit 29 and perform the cleaning operation.

When the operation in the cleaning mode is started, the control unit 8 determines whether or not the absolute humidity of the air in the room RM has reached a predetermined humidity (step ST4). The control unit 8 determines that the value of the absolute humidity in the room has reached the predetermined value AH1 not only when the value of the absolute humidity in the room is the predetermined value AH1 but also when the value of the absolute humidity in the room exceeds the predetermined value AH1.

For the determination in step ST4, the control unit 8 detects the indoor temperature by the indoor temperature sensor 31 and detects the indoor relative humidity by the indoor humidity sensor 32. The control unit 8 calculates the absolute humidity of the air in the room RM from the air temperature value MT detected by the room temperature sensor 31 and the air relative humidity value MRH detected by the room humidity sensor 32. Here, a case where the indoor humidity sensor 32 is a relative humidity sensor that detects the relative humidity will be described. However, an absolute humidity sensor that detects absolute humidity can be used as the indoor humidity sensor included in the air-conditioning indoor unit 2, and the control unit 8 can be configured to compare the value detected by the absolute humidity sensor with the predetermined value AH1.

When the absolute humidity in the room does not reach the predetermined value AH1 (No in step ST4), the control unit 8 controls the humidifier 6 so as to supply water to the room RM.

In the case of the air conditioning system 1, two methods are set for supplying water by the humidifier 6. The control unit 8 selects an appropriate operation from the following first humidification operation and second humidification operation.

The first humidification operation is an operation of humidifying at the same time as heating. In the first humidification operation, the control unit 8 controls the air conditioner 10 and the humidifier 6 so that the air conditioner 10 heats the room RM and the humidifier 6 simultaneously humidifies the room RM. ..

The second humidification operation is an operation in which the heating operation in the first humidification operation is stopped and only the humidification operation is performed. In the first humidification operation, the control unit 8 controls the air conditioner 10 and the humidifier 6 so as to humidify the room RM by the humidification operation of the humidifier 6. In the second humidification operation, the heating operation is not performed, but since the air with high humidity is sent from the air conditioning indoor unit 2 to the room RM, the air conditioner 10 performs the air blowing operation.

The control unit 8 selects the first humidification operation or the second humidification operation based on the temperature in the room (step ST5). If the temperature detected by the indoor temperature sensor 31 is equal to or higher than the predetermined temperature T1 (Yes in step ST5), the control unit 8 selects the second humidification operation. On the contrary, if the temperature detected by the indoor temperature sensor 31 is less than the predetermined temperature T1 (No in step ST5), the control unit 8 selects the first humidification operation.

In both the first humidification operation (step ST6) and the second humidification operation (step ST7), the humidification operation by the humidifier 6 is performed. The humidifying operation performed in the first humidifying operation and the second humidifying operation is the same as the humidifying operation of the humidifier 6 performed in the humidifying operation in the normal mode. However, in the humidification operation performed in the first humidification operation and the second humidification operation, it is set so as to be equal to or more than the maximum value of the humidification capacity that appears in the humidification operation in the normal mode. The wash mode does not emphasize the comfort of the room RM, but rather prioritizes the quick termination of operation in the wash mode. Therefore, in the cleaning mode, the first humidification operation or the second humidification operation is performed at a value equal to or higher than the maximum value of the humidification capacity that appears in the humidification operation in the normal mode so that the absolute humidity in the room reaches the predetermined value AH1 quickly. For example, when L tap, M tap, and H tap are set in order from the lowest humidifying capacity of the humidifying operation in the normal mode, the H tap is selected in the first humidifying operation and the second humidifying operation. ..

In the first humidification operation, the control unit 8 controls the air conditioner 10 together with the humidifier 6 so that the heating operation is performed at the same time as the humidification operation. The control unit 8 controls the air conditioner 10 so as to reach a target temperature preset for the cleaning mode. Since the heating operation performed by the air conditioner 10 in the cleaning mode is the same as the operation of the air conditioner 10 in the heating operation in the normal mode, the description thereof will be omitted here.

In both the first humidification operation (step ST6) and the second humidification operation (step ST7), the control unit 8 determines whether or not a predetermined time tt1 has elapsed from the start of humidification (step ST8). If the predetermined time tt1 has not elapsed (No in step ST8), the process returns to step ST3, and the first humidification operation or the second humidification operation is continued until the absolute humidity in the room reaches the predetermined value AH1.

If the predetermined time tt1 has elapsed (Yes in step ST8), an abnormality is notified (step ST11), a drying operation is performed at the end (step ST12), and the cleaning mode is terminated.

When the absolute humidity in the room reaches the predetermined value AH1 (Yes in step ST4), the cleaning operation is started (step ST9). In the cleaning operation, the humidifier 6 has stopped the humidifying operation. In the cleaning operation, the air conditioner 10 performs the same operation as the dehumidifying operation. In the air conditioning system 1 of this embodiment, the control unit 8 controls the air conditioner 10 so as to perform the same operation as the first dehumidifying operation.

From the start of the cleaning operation, the control unit 8 starts counting by the timer 81a. When the timer 81a elapses the predetermined time tt2 (Yes in step ST10), the control unit 8 ends the first dehumidifying operation and causes the timer 81a to perform the drying operation at the end (step ST12).

The final drying operation in the cleaning mode is the same as the first drying operation in the humidification operation in the normal mode. The control unit 8 stops the suction fan 65 and the suction rotor 61 of the humidifier 6 in order to dry the intake / exhaust hose 68. Further, the control unit 8 heats the air in the heater 62 of the humidifier 6, switches the switching damper 63 so as to generate an air flow from the first inlet / outlet 63a to the second inlet / outlet 63b, and drives the intake / exhaust fan 64.

Here, as shown in FIG. 8, assuming that the operation starts at the same time at time t10, the operation in the cleaning mode and the humidification operation in the normal mode are compared. In the operation in the cleaning mode, since there is no operation for drying the intake / exhaust hose 68 before the humidification operation, the humidification operation can be started immediately (time t10). In the cleaning mode, the humidification operation can be completed and the cleaning operation can be started at the time t11 when the first drying operation of the normal mode continues. In the example shown in FIG. 8, the cleaning operation in the cleaning mode is completed at the time t12 when the first drying operation in the humidifying operation in the normal mode ends. In the example shown in FIG. 8, the drying operation at the end of the washing mode can be completed at the time t13 when the humidifying operation in the normal mode ends.

(2-3-3) Conditions for shifting to the cleaning mode In the air conditioning system 1, the control unit 8 automatically determines in step ST2 whether or not to shift to the cleaning mode. The process of the control unit 8 for determining the transition condition of the cleaning mode will be described with reference to FIG.

The control unit 8 determines the operation mode (step ST21). When the operation mode is the cleaning mode (Yes in step ST21), the integrated drive time is reset (step ST29).

When the operation mode is other than the cleaning mode (No in step ST21), the control unit 8 determines the type of operation (step ST22). The air conditioning system 1 of the embodiment has a normal mode as an operation mode other than the cleaning mode. However, the air conditioning system 1 may be configured to have an operating mode other than the normal mode and the cleaning mode. The air conditioning system 1 can select cooling operation, heating operation, dehumidifying operation, humidifying operation, blowing operation, ventilation operation, and air cleaning operation as the operation in the normal mode. Further, the air conditioning system 1 may have an operation other than the cooling operation, the heating operation, the dehumidifying operation, the humidifying operation, the ventilation operation, the ventilation operation, and the air cleaning operation as the operation in the normal mode. It may be configured not to include one or more of the operations.

When the air conditioning system 1 is performing heating operation, humidification operation, ventilation operation, ventilation operation, or air purification operation (Yes in step ST22), the control unit 8 counts the drive time of the indoor fan 22 (step ST23). ). Performing heating operation, humidification operation, ventilation operation, ventilation operation, or air purification operation means that, in other words, operation other than cooling operation and dehumidification operation is performed. The operation time of the indoor fan 22 is counted by the control arithmetic unit 81b using, for example, the timer 81a of the indoor control plate 81. The control arithmetic unit 81b stores the counted drive time in the storage device 81c. The drive time of the indoor fan 22 is counted until the current operation is completed (Yes in step ST25). For example, even during the heating operation, when the temperature of the room RM has reached the target temperature and the compressor 41 and the indoor fan 22 are stopped, the driving time of the indoor fan 22 is not counted.

The drive time of the indoor fan 22 is counted in the first drive time and the second drive time. The first drive time is the drive time of the indoor fan 22 during the operation of the air-conditioning indoor unit 2 that heats the air with the indoor heat exchanger 21 in the normal mode. In other words, the first drive time is the drive time of the indoor fan 22 during the heating operation (including the heating / humidification operation) of the air conditioning indoor unit 2. The second drive time is the drive time of the indoor fan 22 during operation of the air-conditioning indoor unit 2 that does not exchange heat with the indoor heat exchanger 21 in the normal mode. In other words, the second drive time is the drive time of the indoor fan 22 during the humidification operation (excluding the heating / humidification operation), the ventilation operation, the ventilation operation, and the air purification operation.

When the air conditioning system 1 is performing the cooling operation or the dehumidifying operation (No in step ST22), the control unit 8 further determines whether or not the operating time of the cooling operation or the dehumidifying operation is tt3 or more for a predetermined time. Make a decision (step ST24). The operation time of the cooling operation or the dehumidifying operation is counted by the control arithmetic unit 81b using, for example, the timer 81a of the indoor control plate 81. The control arithmetic unit 81b stores the counted operation time in the storage device 81c. If the operating time of the cooling operation or the dehumidifying operation is tt3 or more for the predetermined time (Yes in step ST24), the control unit 8 resets the integrated drive time of the indoor fan 22 (step ST29). In other words, the control unit 8 resets the integrated drive time when the air-conditioning indoor unit 2 that causes dew condensation is operated in the indoor heat exchanger 21 in the normal mode.

If the operating time of the cooling operation and the dehumidifying operation is less than the predetermined time tt3 (No in step ST24), the control unit 8 does not count the driving time of the indoor fan 22, and whether or not the current operation is completed. The process proceeds to step ST25 for determining. In other words, the control unit 8 controls not to include the drive time of the indoor fan 22 when the air conditioner indoor unit 2 is operating to cause dew condensation on the indoor heat exchanger 21 in the normal mode.

When the current operation is completed (Yes in step ST25), the control unit 8 calculates the integrated drive time of the indoor fan 22 (step ST26). The control unit 8 integrates the drive times stored in the storage device 81c to calculate the integrated drive time. Here, the integrated drive time is calculated by totaling the drive times of the indoor fans 22 in the heating operation, the humidification operation, the ventilation operation, the ventilation operation, and the air purification operation. However, the method of calculating the integrated drive time is not limited to the method of simply summing the drive times of each operation. For example, the control unit 8 can be configured so that the integrated drive time is calculated by weighting each type of operation.

The control unit 8 determines whether or not the integrated drive time is equal to or longer than the predetermined drive time CT1 (step ST27). If the integrated drive time is equal to or longer than the predetermined drive time CT1 (Yes in step ST27), the control unit 8 shifts to the cleaning mode (step ST27). The determination in step ST27 in FIG. 9 is an example of the determination in step ST2 in FIG. Here, if the integrated drive time is equal to or longer than the predetermined drive time CT1, it is determined that the condition for shifting to the cleaning mode is satisfied. However, the condition for shifting to the cleaning mode does not necessarily have to be that the integrated drive time is equal to or longer than the predetermined drive time CT1. As a condition for shifting to the cleaning mode, for example, a condition that the operation in the normal mode is stopped may be added.

If the integrated drive time is less than the predetermined drive time CT1 (No in step ST27), the control unit 8 returns to the beginning (step ST21) and repeats the step for integrating the integrated drive time.

After the transition to the cleaning mode (step ST28), the integrated drive time is reset (step ST29), and if the air conditioning system 1 is not stopped (No in step ST30), it returns to the beginning (step ST21) and integrated. Repeat the steps for integrating the drive time. In the case of operation in the cleaning mode, step ST21, step ST29 and step ST30 are repeated, so that the integrated drive time is not counted even if the indoor fan 22 is driven.

(3) Modification example (3-1) Modification example 1A
In the above embodiment, the air conditioning system 1 in which the indoor heat exchanger 21 does not have an auxiliary heat exchange unit is described as an example. However, in the air conditioning system 1 of the first embodiment, a heat exchanger having an auxiliary heat exchange unit can be used as the indoor heat exchanger 21. The auxiliary heat exchange unit is attached to, for example, the front side of the first heat exchange unit 21F at a position above the middle in the vertical direction.

When the indoor heat exchanger 21 is provided with the auxiliary heat exchange unit, in the second dehumidifying operation, the control unit 8 turns off the solenoid valve 28 and adjusts the operating frequency of the compressor 41 and the opening degree of the outdoor expansion valve 45. do. The control unit 8 makes the auxiliary heat exchange unit an evaporation region by the adjustment as described above. At this time, the first heat exchange unit 21F and the second heat exchange unit 21R are set to the superheat region.

(3-2) Modification 1B
In the above embodiment, a case where the same refrigeration cycle as the first dehumidifying operation in the normal mode is performed in the refrigerant circuit 13 as the cleaning operation in the cleaning mode is described. However, as the cleaning operation in the cleaning mode, the cleaning operation that causes dew condensation on the surface of the indoor heat exchanger 21 is not limited to the same refrigeration cycle as the first dehumidification operation.

The cleaning operation may be, for example, an operation in which the first dehumidifying operation is performed at the start of the cleaning operation, and the operation is changed to the second dehumidifying operation or the third dehumidifying operation in the middle. In such a case, the control of the control unit 8 sets substantially all of the first heat exchange unit 21F and the second heat exchange unit 21R in the evaporation region at the start of the cleaning operation, and sets the second heat in the middle of the cleaning operation. The control is to change the exchange section 21R to a superheated region or a condensed region.

(3-3) Modification 1C
In the above embodiment, the drying operation at the end of the cleaning mode (step ST12) may include drying the indoor heat exchanger 21 by blowing and heating the air conditioner 10.

(3-4) Modification 1D
In the above embodiment, when the absolute humidity does not reach the predetermined value AH1 even after the lapse of the predetermined time tt1, the control unit 8 ends the humidification to the humidifier 6 and notifies that the cleaning operation cannot be performed (step). ST11). However, the air conditioning system may be configured to perform a process different from that of the above embodiment when the absolute humidity does not reach the predetermined value AH1.

Regarding the processing after step ST10, for example, the control of the control unit 8 of the air conditioning system 1 of the above embodiment may be changed as follows. When a predetermined time tt1 has elapsed from the start of humidification by the first humidification operation (step ST6) or the second humidification operation (step ST7), the control unit 8 starts the cleaning operation (step ST9). The control of the control unit 8 after the cleaning operation is started is performed in the same manner as in the above embodiment.

(3-5) Modification 1E
In the above embodiment, a case where the first humidification operation or the second humidification operation is selectively executed as the humidification operation in the cleaning mode will be described. However, the humidification operation in the humidification mode is not limited to the first humidification operation or the second humidification operation. For example, the air conditioning system 1 may be configured so that the following third humidification operation can be selected as the humidification operation in the cleaning mode.

The third humidification operation is an operation of supplying moisture to the room RM by supplying outdoor air to the room RM. When the amount of water contained in the outdoor air is large, the absolute humidity of the room RM may reach a predetermined value AH1 by supplying the outdoor air to the room RM. Before step ST5 shown in FIG. 7, the control unit 8 determines whether or not the absolute humidity of the room RM can reach a predetermined value AH1 by supplying outdoor air to the room RM. do. The control unit 8 detects the temperature and relative humidity of the outdoor air with the outside air temperature sensor 51 and the outside air humidity sensor 71. For example, when the temperature of the outdoor air is a predetermined temperature T2 or higher and the relative humidity of the outdoor air is a predetermined humidity RH1 or higher, the control unit 8 can bring the absolute humidity of the room RM to a predetermined value AH1. Judge. When it is determined that the predetermined value AH1 can be reached, the control unit 8 drives the intake / exhaust fan 64 to perform an air supply operation for supplying outdoor air to the room RM through the intake / exhaust hose 68.

(3-6) Modification 1F
In the above embodiment, the time during which the indoor fan 22 is driven during the operation in the normal mode is counted as the driving time. However, the method of counting the drive time is not limited to such a method. For example, as a simple driving time counting method, the operation time in the normal mode may be counted. For example, when the operating time of a certain heating operation is tt4 and the driving time of the indoor fan 22 in the heating operation is tt5 (however, tt5 <tt4), the operating time tt4 of the heating operation is the driving time of the indoor fan 22. May be used as.

(3-7) Modification 1G
In the above modified example 1F, a case where the operation time of the normal mode operation is used as the drive time has been described as a simple counting method of the indoor fan 22. In addition to that, for example, when the air conditioning indoor unit 2 has a cleaning mechanism for the air filter 24, the number of times the cleaning mechanism for the air filter 24 is cleaned may be regarded as the driving time of the indoor fan 22. For example, one cleaning of the cleaning mechanism is regarded as 10 hours of the driving time of the indoor fan 22. For example, the control unit 8 counts the number of cleanings of the cleaning mechanism in step ST23, and calculates the cumulative number of cleanings of the cleaning mechanism in step ST26. In step ST27, the control unit 8 determines that if the cleaning mechanism cleans a predetermined number of times (for example, 20 times), the mode shifts to the cleaning mode. Further, in step ST29, the control unit 8 resets the number of times of cleaning of the cleaning mechanism.

(3-8) Modification 1H
In the above embodiment, the case where the humidifier 6 is integrated with the air conditioner outdoor unit 4 is described. However, the humidifier 6 arranged outside may not be integrated with the air conditioner outdoor unit 4, or may be a separate body. When the humidifier 6 arranged outdoors and the air conditioner outdoor unit 4 are separate bodies, for example, the air conditioner outdoor unit 4 may be placed on the outdoor ground and the humidifier 6 may be attached to the outer wall.

(3-9) Modification 1I
In the above embodiment, the case where the intake / exhaust hose 68 indirectly communicates with the space in the room RM via the air conditioning indoor unit 2 is shown. However, the intake / exhaust hose 68 may be installed so as to directly communicate with the space in the room RM without going through the air conditioning indoor unit 2.

(3-10) Modification 1J
In the above embodiment, the case where the operation for drying is not performed before the humidifying operation of the operation in the cleaning mode is shown. However, as shown in FIG. 10, the air conditioning system 1 may be configured to perform a second drying operation, which is shorter than the first drying operation, before the humidifying operation of the cleaning mode operation. The time required for the first drying operation is shorter than the time required for the second drying operation ((time t12-time t10)> (time t21-t10)). Therefore, in the cleaning mode, the control unit 8 dries the intake / exhaust hose 68 before starting to send the air moistened by the second drying operation, which has a shorter operation time than the first drying operation. 6 is controlled.

(3-11) Modification 1K
In the above embodiment, when it is determined in step ST4 that the absolute humidity is equal to or higher than the predetermined value AH, the case where the cleaning operation (step ST9) is started without performing the humidification operation has been described. However, as shown in FIG. 11, after the absolute humidity is determined to be the predetermined value AH or more, it may be configured to determine whether or not the indoor temperature is the predetermined temperature T1 or more. When the control unit 8 determines that the absolute humidity is equal to or higher than the predetermined value AH (Yes in step ST4), the control unit 8 then determines whether or not the indoor temperature is equal to or higher than the predetermined temperature T1 (step ST13). In other words, the control unit 8 selects whether or not to perform the first humidification operation based on the temperature in the room. If the temperature detected by the indoor temperature sensor 31 is equal to or higher than the predetermined temperature T1 (Yes in step ST13), the control unit 8 starts the cleaning operation (step ST9). On the contrary, if the temperature detected by the indoor temperature sensor 31 is less than the predetermined temperature T1 (No in step ST13), the control unit 8 selects the first humidification operation. If the indoor temperature is too low, a large amount of condensed water cannot be generated. However, by adding the judgment of step ST13, it is possible to avoid the situation where the indoor temperature is too low to generate a large amount of condensed water. can.

(4) Features (4-1)
The humidifier 6 of the air conditioning system 1 of the above embodiment and the modified example 1J has an intake / exhaust hose 68. Therefore, in the normal mode, the control unit 8 causes the humidifier 6 to perform a first drying operation for drying the intake / exhaust hose 68 before starting to send the moistened air through the intake / exhaust hose 68. On the other hand, the control unit 8 of the embodiment does not cause the humidifier 6 to perform the operation of drying the intake / exhaust hose 68 before starting to send the moistened air through the intake / exhaust hose 68 in the cleaning mode. Further, in the cleaning mode, the control unit 8 of the modified example 1J performs a second drying operation of drying the intake / exhaust hose 68 on the humidifier 6 before starting to send the moistened air through the intake / exhaust hose 68. Let me. The operating period of this second drying operation is shorter than the operating period of the first drying operation.

When starting to send the air with moisture without performing the operation of drying the intake / exhaust hose 68, the time is increased by the operation time of the first drying operation (time from time t10 to time t12 in FIG. 8). It can be shortened and the cleaning operation can be started earlier. Further, when the air conditioning system 1 dries the intake / exhaust hose 68 before starting to send the air moistened by the second drying operation in the cleaning mode, the operation time of the second drying operation is longer than that of the first drying operation. By a short time (time from time t12 to time t21), the time can be shortened and the cleaning operation can be started earlier.

(4-2)
In the cleaning mode, the control unit 8 of the air conditioning system 1 of the embodiment and the modified example 1J is a third drying operation for drying the intake / exhaust hose 68 after performing the cleaning operation of the indoor heat exchanger 21. The humidifier 6 is controlled so as to perform the above. By drying the intake / exhaust hose 68 in the final drying operation (third drying operation) after the cleaning operation, the state of the intake / exhaust hose 68 after the cleaning operation can be kept good.

(4-3)
The humidifier 6 of the air conditioning system 1 of the embodiment and the modification 1J has a heater 62. In the final drying operation, which is the third drying operation, the control unit 8 stops the function of adding moisture to the air and sets the humidifier 6 so that the air heated by the heater 62 passes through the intake / exhaust hose 68. I'm in control. In this way, since the inside of the intake / exhaust hose 68 can be dried by the heater 62 of the humidifier 6, it is possible to suppress the addition of equipment for drying the intake / exhaust hose 68 at the end of the cleaning mode.

(4-4)
The humidifier 6 of the embodiment and the modified example 1J has a suction rotor 61 which is a suction member for sucking the moisture of the outside air. The humidifier 6 imparts moisture adsorbed from the outside air by the adsorption rotor 61 to the air sent into the room by the intake / exhaust hose 68. When there is no suction member such as the suction rotor 61, it is necessary to perform a water supply operation for replenishing the water used by the user in the cleaning mode, for example. On the other hand, in the cleaning mode, the air conditioning system 1 can omit the water supply work by obtaining water from the outside air by the suction rotor 61, and can save the trouble of cleaning the indoor heat exchanger 21.

(4-5)
The control unit 8 of the embodiment and the modified example 1J controls the humidifier 6 so that the absolute humidity in the room reaches a predetermined value AH1 in the cleaning mode (steps ST6 and ST7). After the humidifying operation by the humidifier 6, the control unit 8 performs a cleaning operation on the air conditioning indoor unit 2 to clean the surface by causing dew condensation on the surface of the indoor heat exchanger 21 (particularly the surface of the heat transfer fins 21a). Let me do it. For example, before the cleaning mode, the inside of the room RM may be dried due to weather conditions or the like, and the amount of water may be insufficient to sufficiently clean the room heat exchanger 21 in the air of the room RM. be. However, even in such a case, the insufficient moisture content of the air in the room RM can be supplemented by the first humidification operation and / or the second humidification operation (steps ST6 and ST7) in the cleaning mode. In the air conditioning system 1 of the above embodiment and the modified example 1J, the absolute humidity of the room RM is set to a predetermined value AH1 (an example in which the humidity in the room is set to a predetermined humidity) in the first humidification operation and / or the second humidification operation in the cleaning mode. It can be raised and the cleaning operation can be performed with sufficient dew condensation water.

Although the embodiments of the present disclosure have been described above, it will be understood that various modifications of the forms and details are possible without departing from the purpose and scope of the present disclosure described in the claims. ..

1 Air conditioning system 2 Air conditioning indoor unit 6 Humidifier 8 Control unit 21 Indoor heat exchanger 62 Heater 68 Intake and exhaust hose

JP-A-2018-71905

Claims (5)

An air-conditioning indoor unit (2) having an indoor heat exchanger (21) and passing indoor air through the indoor heat exchanger to exchange heat of the indoor air.
A humidifier (6) having a hose (68) communicating with the room and sending moistened air with the hose, and a humidifier (6).
To perform air conditioning of the room in the normal mode, the cleaning mode to perform the cleaning operation later a humidified room air cleaning the indoor heat exchanger, a control for controlling said humidifier and said air conditioner indoor unit With part (8)
The control unit
In the normal mode, the humidifier is controlled to perform a first drying operation to dry the hose before starting to send the moistened air.
In the cleaning mode, the air moistened by the second drying operation, which has a shorter operation time than the first drying operation, is started to be sent without performing the operation of drying the hose. An air conditioning system (1) that controls the humidifier to dry the hose before it begins to feed. In the cleaning mode, the control unit controls the humidifier so as to perform a third drying operation for drying the hose after performing a cleaning operation for the indoor heat exchanger.
The air conditioning system (1) according to claim 1. The humidifier has a heater (62) and has a heater (62).
In the third drying operation, the control unit controls the humidifier so that the function of imparting moisture to the air is stopped and the air heated by the heater is passed through the hose.
The air conditioning system (1) according to claim 2. The humidifier has an adsorption member that adsorbs moisture from the outside air, and imparts moisture adsorbed from the outside air by the adsorption member to the air sent into the room by the hose.
The air conditioning system (1) according to any one of claims 1 to 3. In the cleaning mode, the control unit controls the humidifier to perform humidification, and then performs a cleaning operation of generating dew condensation water on the surface of the indoor heat exchanger and cleaning the surface with the dew condensation water. To control the air conditioning indoor unit,
The air conditioning system (1) according to any one of claims 1 to 4.

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