JP2006017369A - Indoor machine of air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an indoor machine of an air conditioner capable of keeping and controlling comfortable room temperatures and room humidity in a heating operation. <P>SOLUTION: This indoor machine of the air conditioner comprises a first heat exchanger 1 provided with a natural evaporation type humidifier on its downstream side, a second heat exchanger 2 not having the natural evaporation type humidifier, a refrigerant circuit connecting the first heat exchanger 1 and the second heat exchanger 2 by a connection pipe 3a, for supplying the refrigerant supplied to the first heat exchanger 1 to the second heat exchanger 2 through the connection pipe 3a, and discharging the refrigerant having passed through both heat exchangers from the second heat exchanger 2, and a flow rate adjusting valve 4 mounted on the connection pipe 3a for adjusting a flow rate of the refrigerant supplied from the first heat exchanger 1 to the second heat exchanger 2. The control of water supply to the natural evaporation type humidifier and the control of the second heat exchanger by adjusting the throttling of the flow rate adjusting valve 4 are conducted on the basis of the temperature and humidity of the indoor air detected by a room temperature sensor and a humidity sensor in the heating operation, to control a switching operation of an air conditioning operation mode. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an indoor unit of an air conditioner that can maintain and manage a comfortable room temperature and indoor humidity particularly during heating operation.

  In places where many people use such as department stores, offices, stores, etc., it is necessary to manage the humidity in the room so as to maintain the indoor relative humidity of 40% or more due to environmental hygiene problems. Therefore, in order to maintain a room relative humidity of 40% or higher in winter when the temperature is low and the humidity is low, the air conditioner used in the above place has a cooling function, a heating function, and a dehumidifying function. , Humidification function is provided. Among air conditioners having a humidifying function, there is a type in which a natural evaporation humidifier is mounted inside an indoor unit as an air conditioner that can reduce power consumption in the humidifier.

  FIG. 12 shows an internal state during heating / humidifying operation of an indoor unit of a conventional air conditioner in which the natural evaporation humidifier 7 is mounted. FIG. 13 is a diagram showing the state of the refrigerant circuit in the indoor unit of FIG. The indoor unit in FIG. 12 is provided with two heat exchangers 1 and 2. In this indoor unit, the indoor air is sucked from the suction port by the blower 10 and is blown to both the heat exchangers 1 and 2, and the air passing through the heat exchangers 1 and 2 is blown into the room from the outlet. It is configured to be.

  And the natural evaporation humidifier 7 is provided in the downstream of one heat exchanger 1 as shown in FIG. The natural evaporative humidifier 7 is connected to a water supply pipe 8 for supplying moisture from the outside of the humidifier to a humidifier (not shown) provided in the humidifier. Further, the water supply pipe 8 Is provided with an electromagnetic valve 9 that is controlled to be opened and closed to supply water to the humidifier 7 or to stop water.

  In addition, a room temperature sensor 11 that detects the temperature of the indoor air is provided at the suction port (upstream side of the blower 10) of the indoor unit, and the temperature detected by the room temperature sensor 11 is lower than a predetermined target temperature. Further, a control means (not shown) for controlling the heating operation is provided. Further, this control means performs not only heating operation control but also opening / closing control of the electromagnetic valve 9 described above, and whether or not humidification is possible by the water supply control to the humidifier 7 by the opening / closing control of the electromagnetic valve 9. Be controlled.

  Further, as shown in FIG. 13, the refrigerant circuit in the indoor unit of the air conditioner has a configuration in which two heat exchangers 1 and 2 of the indoor unit are connected by a pipe 3 a, and the refrigerant circuit 3 The refrigerant supplied to one heat exchanger 1 is supplied to the other heat exchanger 2 through the connection pipe 3a, and the outdoor unit (not shown) is supplied from the other heat exchanger 2 through the refrigerant pipe 3. It is possible to discharge to

  Next, the humidifying operation at the time of heating operation by the indoor unit of the air conditioner having the above-described configuration will be described.

  First, when the temperature detected by the room temperature sensor 11 is lower than a predetermined target temperature, the two heat exchangers 1 and 2 are heated based on a command from the control means, and the heating operation is started. Specifically, based on a command from the control means, a high-pressure and high-temperature gas refrigerant is supplied from a compressor (not shown) outside the indoor unit to one heat exchanger 1 inside the indoor unit. As the high-pressure and high-temperature gas refrigerant supplied to the heat exchanger 1 sequentially passes through one heat exchanger 1 and the other heat exchanger 2, both the heat exchangers 1 and 2 are heated. And the dry indoor air sucked from the suction port becomes dry hot air by passing through the heat exchangers 1 and 2 that have been heated as described above.

  Further, when the electromagnetic valve 9 is opened based on the command from the control means together with the start of the heating operation described above, water is dripped and supplied to the humidifying material inside the natural evaporation humidifier 7 through the water supply pipe 8. The humidifier is in a damp state where moisture has penetrated. And when the dry warm air which blows off from the one heat exchanger 1 passes over the humidification material of this state, the permeation | transmission water | moisture content of a humidification material will naturally evaporate with this warm air, and this naturally evaporated water | moisture content was dry temperature. Absorbed by the wind. Thus, wet warm air is blown out from the outlet on the one heat exchanger 1 side. Moreover, the dry warm air which generate | occur | produced in the other heat exchanger 2 of a heating state will be blown out from the blower outlet by the side of the other heat exchanger 2. FIG. As described above, in a conventional air conditioner indoor unit incorporating the natural evaporation humidifier 7, heating and humidification are performed simultaneously.

  Here, during the heating operation described above, the high-pressure / high-temperature gas refrigerant supplied to one heat exchanger 1 is gradually increased in pressure and room temperature by heat exchange in both heat exchangers 1 and 2, as shown in FIG. It changes into a liquid refrigerant, and the high-pressure / normal temperature liquid refrigerant is discharged from the other heat exchanger 2 to the outdoor unit.

  Next, in the indoor unit of this conventional air conditioner, when the temperature detected by the room temperature sensor 11 reaches a predetermined target temperature due to heating operation, in order to suppress the subsequent increase in room temperature, based on a command from the control means The heating operation is stopped and the air blowing operation is started instead. Specifically, first, based on a command from the control means, the circulation of the refrigerant is stopped as shown in FIG. Then, a refrigerant | coolant will be in a gas-liquid equilibrium state and both the heat exchangers 1 and 2 will be in a normal temperature state. At the same time, the electromagnetic valve 9 of the water supply pipe 8 is closed based on a command from the control means to stop water supply to the humidifying material. Then, as shown in FIG. 14, the indoor air sucked from the suction port passes through the heat exchangers 1 and 2 in the normal temperature state and is blown out from the blower outlet. Thus, in this conventional air conditioner indoor unit, the air blowing operation is performed when the indoor air temperature reaches the predetermined target temperature.

  As described above, in a conventional air conditioner indoor unit incorporating the natural evaporation humidifier 7, humidification is performed only by performing a heating operation, and by performing humidification together with heating, the indoor air temperature is reduced. In addition to reaching the target temperature, the indoor relative humidity reaches the target humidity (for example, indoor relative humidity of 40%).

  Incidentally, an indoor unit of an air conditioner of the type in which a natural evaporation humidifier as described above is mounted is disclosed in, for example, Patent Document 1 below.

JP-A-10-82538

  In recent years, the heating load tends to decrease due to the spread of OA (Office Automation) devices, etc., so that the indoor relative humidity does not reach the target humidity (for example, 40% or more) even when the temperature of the indoor air reaches the target temperature. That happened. In such a case, according to the conventional indoor unit having the above-described configuration, when the temperature of the room air reaches the target temperature, the heating operation is stopped and the air flow is stopped in order to suppress further increase in the room temperature. Since the operation is performed, the humidification operation is not continued thereafter, and a situation occurs in which the indoor relative humidity changes without reaching the target humidity as shown in FIG. 16, for example. As described above, in a type of indoor unit in which a conventional natural evaporation humidifier is mounted, there is a problem that sufficient indoor relative humidity cannot be reached during heating operation.

  The objective of this invention is providing the indoor unit of the air conditioner which enables maintenance management of the comfortable room temperature and indoor relative humidity at the time of heating operation.

  In order to achieve the above object, the present invention is configured such that indoor air sucked from the room is blown into the room after passing through the plurality of heat exchangers by the blowing means, and downstream of at least one heat exchanger. And an air conditioner indoor unit in which a natural evaporating humidifier capable of supplying moisture from the outside during humidification is disposed, the first heat exchanger having a natural evaporating humidifier disposed downstream, and a downstream Connect the second heat exchanger with no natural evaporation humidifier on the side, the first heat exchanger, and the second heat exchanger with a connecting pipe, and supply to this first heat exchanger The refrigerant is supplied to the second heat exchanger through the connection pipe, and the refrigerant circuit that has passed through both heat exchangers is discharged from the second heat exchanger, and the connection pipe is provided. Flow rate adjustment to adjust the flow rate of refrigerant supplied from one heat exchanger to the second heat exchanger Means, a room temperature detecting means for detecting the temperature of the indoor air, a humidity detecting means for detecting the humidity of the indoor air, and the natural evaporation type humidifier based on the detected temperature and humidity of the indoor air during heating operation And the control means for controlling the switching operation of the air-conditioning operation mode by controlling the second heat exchanger by adjusting the throttle of the flow rate adjusting means.

  Further, in the air conditioner indoor unit configured as described above, if both the detected temperature and humidity of the indoor air are less than the predetermined target temperature and target humidity, the control means is connected to the natural evaporation humidifier. It is advisable to perform control to execute a heating / humidifying operation mode in which both the heat exchangers are heated by fully opening the throttle of the flow rate adjusting means, and the detected indoor air When the temperature is less than the predetermined target temperature and the detected humidity of the indoor air has reached the predetermined target humidity, the water supply to the natural evaporation humidifier is stopped, and the flow rate adjusting means It is preferable to perform control to execute a heating operation mode in which the throttle is fully opened and both heat exchangers are heated.

  In the indoor unit of the air conditioner configured as described above, the present invention further detects an evaporating pressure detecting means for detecting an evaporating pressure of the refrigerant in the second heat exchanger, and detects a temperature of the second heat exchanger. A heat exchanger temperature detecting means, and the control means is based on the detected temperature and humidity of the indoor air, the evaporation pressure of the refrigerant in the second heat exchanger, and the temperature of the second heat exchanger. In addition, control of water supply to the natural evaporation humidifier and control of the second heat exchanger by adjusting the throttle of the flow rate adjusting means are performed to control the switching operation of the air conditioning operation mode.

  In the air conditioner indoor unit configured as described above, when the detected indoor air temperature has reached a predetermined target temperature and the detected indoor air humidity is less than the predetermined target humidity. The control means starts supplying water to the natural evaporation humidifier, calculates the dew point temperature of the room air based on the detected temperature and humidity of the room air, and is detected from the heat exchanger temperature detection means. While monitoring the temperature of the second heat exchanger and the evaporating pressure detected by the evaporating pressure detecting means, the throttle of the flow rate adjusting means is adjusted, the first heat exchanger is brought into a heating state, and the second heat exchange is performed. It is preferable to perform control to execute a humidifying operation mode in which the vessel is cooled to a temperature equal to or higher than the dew point temperature obtained by calculation.

  In addition, when the detected indoor air temperature has reached a predetermined target temperature and the detected indoor air humidity exceeds the predetermined target humidity, the control means sends it to the natural evaporation humidifier. The temperature of the second heat exchanger detected by the heat exchanger temperature detecting means and the evaporation pressure detection are calculated by stopping the water supply of the water and calculating the dew point temperature of the indoor air based on the detected indoor air temperature and humidity. While adjusting the throttle of the flow rate adjusting means while monitoring the evaporation pressure detected by the means, the first heat exchanger is brought into a heating state, and the second heat exchanger is set to a temperature lower than the dew point temperature obtained by calculation. It is good to perform control which performs dehumidifying operation mode at the time of heating set to the cooling state.

  According to the present invention, for example, even under an environment with a small heating load such as a room where a large number of OA devices are arranged, humidity control during heating operation can be appropriately performed. The indoor air temperature and the indoor relative humidity can be maintained in a comfortable state.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 11. FIG. 1 is a diagram showing an internal configuration of an indoor unit in the air conditioner of the present invention. FIG. 2 is a diagram showing a configuration of a refrigerant circuit in the indoor unit of the air conditioner of FIG.

[Constitution]
The indoor unit of the air conditioner according to the present embodiment is provided with two heat exchangers. And this indoor unit is comprised so that indoor air may be suck | inhaled from a suction inlet by the air blower 10, and it will ventilate to both heat exchangers, and the air which passed these heat exchangers will be blown out indoors from a blower outlet. ing.

  A natural evaporating humidifier 7 is provided on the downstream side of one heat exchanger (first heat exchanger) 1. The natural evaporative humidifier 7 is connected to a water supply pipe 8 for supplying moisture from the outside of the humidifier to a humidifier (not shown) provided in the humidifier. Further, the water supply pipe 8 Is provided with an electromagnetic valve 9 that is controlled to be opened and closed to supply water to the humidifier and to stop water.

  In addition, a room temperature sensor 11 that detects the temperature of the indoor air and a humidity sensor 12 that detects the humidity (relative humidity) of the indoor air are provided at the inlet (upstream side of the blower 10) of the indoor unit. . The indoor air temperature and humidity detection processing may be performed continuously, or may be performed intermittently after a certain period of time.

  Further, as shown in FIG. 2, the refrigerant circuit in the air conditioner has a configuration in which two heat exchangers of the indoor unit are connected by a pipe 3 a, and the first heat exchange is performed via the refrigerant pipe 3. The refrigerant supplied to the vessel 1 is supplied to the other heat exchanger (second heat exchanger) 2 through the connection pipe 3a, and the outdoor is passed from the second heat exchanger 2 through the refrigerant pipe 3. It can be discharged to a machine (not shown). Further, the connection pipe 3a is provided with a flow rate control valve (for example, an expansion valve) 4 for adjusting the flow rate of the refrigerant supplied from the first heat exchanger 1 to the second heat exchanger 2. Yes.

  Further, the second heat exchanger 2 is provided with a heat exchanger temperature sensor 6 that detects the temperature of the second heat exchanger 2. Further, a pressure sensor 5 for detecting the evaporation pressure of the refrigerant passing through the second heat exchanger 2 is provided on the downstream side of the second heat exchanger 2.

  The indoor unit of the air conditioner has a control device (not shown) that controls the switching operation of the air conditioning operation mode based on the temperature and humidity of the indoor air detected by each of the sensors during the heating operation. Is provided. In this control device, the target temperature and target humidity to be reached by heating operation are set and registered in advance, and the control device compares the target temperature and target humidity with the detected temperature and humidity of the indoor air. The switching operation of the air conditioning operation mode is controlled according to the comparison result. Here, the air-conditioning operation mode in the present embodiment includes four types of operation modes of heating / humidification operation, heating operation, humidification operation, and dehumidifying operation during heating. The opening / closing operation of the valve 9 (that is, water supply to the natural evaporative humidifier 7 and water shutoff operation) and the throttle adjustment of the flow rate control valve 4 of the connection pipe 3a are performed by the control device.

  Next, the four types of operation modes described above that are switched by the control device will be described with reference to FIGS.

[Heating / humidifying operation mode]
First, when the detected temperature of the indoor air by the room temperature sensor 11 and the detected humidity of the indoor air by the humidity sensor 12 have not reached the target temperature and the target humidity set in the control device, the control device performs heating operation. Control for executing a heating / humidifying operation mode in which the humidifying operation is performed simultaneously is performed. In this case, the control device controls the electromagnetic valve 9 to be “open”. Therefore, water is dripped and supplied to the humidifying material inside the natural evaporation humidifier 7 through the water supply pipe 8, and the humidifying material is in a damp state in which moisture has permeated.

  Further, in the heating / humidification operation mode, the control device controls the flow rate control valve 4 to be “fully open”. When the high-pressure / high-temperature gas refrigerant compressed by the compressor (not shown) outside the indoor unit is supplied to the indoor unit in the controlled state, the high-pressure / high-temperature gas refrigerant is It is supplied to the heat exchanger 1 and further supplied from the first heat exchanger 1 to the second heat exchanger 2 via the connection pipe 3a. By sequentially passing through each heat exchanger in this way, both heat exchangers are heated. In this case, the high pressure / high temperature gas refrigerant supplied to the first heat exchanger 1 gradually changes to a high pressure / normal temperature liquid refrigerant by heat exchange in both heat exchangers as shown in FIG. From the second heat exchanger 2, high-pressure / normal-temperature liquid refrigerant is discharged to the outdoor unit.

  When the operation is performed in the state as described above, as shown in FIG. 4, first, the dry indoor air sucked from the suction port passes through the first heat exchanger 1 in the heated state, and thus the dry temperature is increased. This dry warm air passes over the humidified humidifier, and the moisture that permeates the humidifier naturally evaporates, and the naturally evaporated moisture is absorbed by the dry warm air. Therefore, wet warm air is blown out from the outlet on the first heat exchanger 1 side. Moreover, from the blower outlet on the second heat exchanger 2 side, dry indoor air sucked from the suction port becomes dry hot air by passing through the heated second heat exchanger 2, and this Dry hot air is blown out.

  As described above, in the heating / humidifying operation mode, the warm hot air is blown out from the outlet on the first heat exchanger 1 side, and the dry hot air is blown out from the outlet on the second heat exchanger 2 side. To increase room temperature and humidity.

[Heating operation mode]
In addition, when the detected temperature of the indoor air has not reached the target temperature but the detected humidity has reached the target humidity, the control device performs control to execute the heating operation mode in which only the heating operation is performed. In this case, the electromagnetic valve 9 is controlled to be “closed” by the control device. Therefore, water is not dripped and supplied to the humidifier inside the natural evaporation humidifier 7 through the water supply pipe 8.

  Further, in the heating operation mode, the flow rate control valve 4 is controlled to be “fully open” by the control device. In the same manner as in the heating / humidifying operation mode described above, the high-pressure / high-temperature gas refrigerant is supplied to the first heat exchanger 1, and further from the first heat exchanger 1 via the connection pipe 3a. It is supplied to the exchanger 2. By sequentially passing through each heat exchanger in this way, both heat exchangers are heated. In this case, the high-pressure / high-temperature gas refrigerant supplied to the first heat exchanger 1 gradually changes to a high-pressure / normal temperature liquid refrigerant by heat exchange in both heat exchangers as shown in FIG. From the second heat exchanger 2, high-pressure / normal-temperature liquid refrigerant is discharged to the outdoor unit.

  When the operation is performed in the above state, as shown in FIG. 5, the dry indoor air sucked from the suction port becomes dry hot air by passing through both heat exchangers in the heated state. Dry hot air is blown out from each outlet. As described above, in the heating operation mode, by blowing dry warm air from each outlet, an increase in humidity is suppressed while promoting an increase in room temperature.

[Humidification mode]
In addition, when the detected temperature of the indoor air has reached the target temperature but the detected humidity has not reached the target humidity, the control device performs control to execute a humidifying operation mode in which only the humidifying operation is performed. In this case, the control device controls the electromagnetic valve 9 to be “open”. Therefore, water is dripped and supplied to the humidifying material inside the natural evaporation humidifier 7 through the water supply pipe 8, and the humidifying material is in a damp state in which moisture has permeated.

  Further, in the humidifying operation mode, as shown in FIGS. 7 and 8, the flow rate is controlled by the control device so that the first heat exchanger 1 is in the heating state and the second heat exchanger 2 is in the weak cooling state. A throttle adjustment control of the control valve 4 is performed. Specifically, the flow control valve 4 is throttled so that the refrigerant in the refrigerant circuit of FIG. 8 is in the following state.

  First, in the first heat exchanger 1, all of the high-pressure / high-temperature gas refrigerant is changed to high-pressure / normal-temperature liquid refrigerant by heat exchange. Next, when the high-pressure / normal temperature liquid refrigerant passes through the flow control valve 4, it changes to a low-pressure / low-temperature liquid refrigerant by adiabatic expansion. In the second heat exchanger 2, the low-pressure / low-temperature liquid refrigerant supplied from the first heat exchanger 1 via the flow rate control valve 4 is changed into a low-pressure / low-temperature gas refrigerant by heat exchange and is transferred to the outdoor unit. Discharged.

  In the humidification operation mode, throttle adjustment control of the flow rate control valve 4 is performed so that the refrigerant in the refrigerant circuit is in the above state, the first heat exchanger 1 is in a heating state, and the second heat exchanger 2 becomes a cooling state. However, when the second heat exchanger 2 is in a cooled state at a temperature lower than the dew point temperature of the room air, the second heat exchanger 2 is in the same state as in the dehumidifying operation, which is not preferable in the humidifying operation mode. . Therefore, in this embodiment, the control device calculates the dew point temperature of the indoor air from the detected temperature and detected humidity of the indoor air, and further detects the detected temperature of the second heat exchanger 2 by the heat exchanger temperature sensor 6. The evaporation pressure detected by the pressure sensor 5 is monitored, and the second heat exchanger 2 is controlled to be in a cooling state (weak cooling state) at a temperature equal to or higher than the dew point temperature obtained by calculation.

  Thus, when the operation is performed with the first heat exchanger 1 in the heated state and the second heat exchanger 2 in the weakly cooled state, first, the dry indoor air sucked from the suction port as shown in FIG. By passing through the heated first heat exchanger 1, it becomes dry warm air, and further, this dry warm air passes over the humidified humidifying material, and the wet air penetrates the humidified material. Is naturally evaporated and the naturally evaporated water is absorbed by the dry warm air, so that the wet warm air is blown out from the outlet on the first heat exchanger 1 side. Further, from the outlet on the second heat exchanger 2 side, the dry room air sucked from the suction port is dried by passing through the second heat exchanger 2 in the weakly cooled state (the original room This air is blown out in a cool air (which has substantially the same humidity as the air).

  As described above, in the humidifying operation mode, hot air is blown out from the outlet on the first heat exchanger 1 side, and cold air is blown out from the outlet on the second heat exchanger 2 side. Humidity is increased by hot air that is moist while suppressing an increase in room temperature by cold air.

[Dehumidifying operation mode during heating]
In addition, when the detected temperature of the indoor air has reached the target temperature and the detected humidity exceeds the target humidity, the control device performs control to execute a dehumidifying operation mode for heating that performs a dehumidifying operation suitable for heating. Done. In this case, the electromagnetic valve 9 is controlled to be “closed” by the control device. Therefore, water is not dripped and supplied to the humidifier inside the natural evaporation humidifier 7 through the water supply pipe 8.

  Further, in the dehumidifying operation mode during heating, as shown in FIGS. 9 and 10, the control device controls the first heat exchanger 1 to be in a heating state and the second heat exchanger 2 to be in a strong cooling state. The throttle control of the flow control valve 4 is performed. Specifically, the flow control valve 4 is throttled so that the refrigerant in the refrigerant circuit of FIG. 10 is in the following state.

  First, in the first heat exchanger 1, all of the high-pressure / high-temperature gas refrigerant is changed to high-pressure / normal-temperature liquid refrigerant by heat exchange. Next, when the high-pressure / normal temperature liquid refrigerant passes through the flow control valve 4, it changes to a low-pressure / low-temperature liquid refrigerant by adiabatic expansion. In the second heat exchanger 2, the low-pressure / low-temperature liquid refrigerant supplied from the first heat exchanger 1 via the flow rate control valve 4 is changed into a low-pressure / low-temperature gas refrigerant by heat exchange and is transferred to the outdoor unit. Discharged.

  In the dehumidifying operation mode during heating, the throttle adjustment control of the flow control valve 4 is performed so that the refrigerant in the refrigerant circuit is in the above-described state, the first heat exchanger 1 is in the heating state, and the second heat The exchanger 2 is in a cooled state. In order to perform the dehumidifying operation, the control device calculates the dew point temperature of the indoor air from the detected temperature and detected humidity of the indoor air, and further detects the second heat exchanger 2 by the heat exchanger temperature sensor 6. The temperature and the evaporation pressure detected by the pressure sensor 5 are monitored, and the second heat exchanger 2 is controlled to be in a cooling state (strong cooling state) at a temperature lower than the dew point temperature obtained by calculation. .

  Thus, when the operation is performed with the first heat exchanger 1 in a heated state and the second heat exchanger 2 in a strong cooling state, first, as shown in FIG. 9, damp indoor air ( The indoor air having a humidity exceeding the target humidity) passes through the first heat exchanger 1 in a heated state, and becomes hot air (having substantially the same humidity as the original indoor air). It blows out from the blower outlet of the one heat exchanger 1 side. Further, from the air outlet on the second heat exchanger 2 side, the damp indoor air sucked from the suction port becomes dry cold air by passing through the second heat exchanger 2 in the strong cooling state. Dry cold wind is blown out.

  As described above, in the humidifying operation mode, hot air having substantially the same humidity as the original indoor air is blown out from the outlet on the first heat exchanger 1 side, and the dehumidified dry cold air is supplied to the second heat exchanger 2 side. By blowing out from the air outlet, the humidity is reduced (dehumidified) by the dry hot air while the decrease in the room temperature is suppressed by the hot air and the cold air.

  Thus, according to the indoor unit of the air conditioner of the present embodiment, the temperature and humidity of the indoor air during the heating operation are maintained at the target temperature and the target humidity by appropriately switching the four types of operation modes. can do. Hereinafter, a situation where the temperature and humidity of the indoor air during the heating operation are maintained using the indoor unit of the air conditioner of the present embodiment will be described with reference to FIG. In the following example, different target temperatures and targets are used depending on the mode in which the humidification operation is performed (heating / humidification operation mode and humidification operation mode) and the mode in which the humidification operation is not performed (heating operation mode and heating dehumidification operation mode). Humidity is set.

  First, as shown in FIG. 11, when heating is started in a situation where neither the temperature nor the humidity of the room air has reached the target temperature and the target humidity, control for executing the heating / humidifying operation mode is performed. As the humidification operation is performed, the temperature and humidity of the room air gradually increase.

  Here, for example, in an environment with a small heating load such as a room where a large number of OA devices are arranged, the room air temperature reaches the target temperature before the room air humidity reaches the target humidity. However, even in such a case, according to the air conditioner of this embodiment, if the detected temperature of the indoor air has reached the target temperature but the detected humidity has not reached the target humidity, the control means And is switched to the humidifying operation mode by the control described above. As a result, the humidity gradually increases while the temperature of the room air maintains the target temperature state.

  If this humidification operation is continued, the detected temperature of the indoor air is the target temperature, but the detected humidity exceeds the target humidity, so that the mode is switched to the dehumidifying operation mode during heating by the above-described control. Thereby, the relative humidity of room air falls gradually. Moreover, the temperature of room air also falls gradually by this dehumidifying operation during heating.

  In this way, the temperature and relative humidity of the room air gradually decrease due to the dehumidifying operation during heating. When the relative humidity of the room air reaches the target humidity as shown in FIG. 11, the temperature of the room air generally decreases from the target temperature. Therefore, it switches to heating operation mode by the above-mentioned control. As a result, the temperature of the room air gradually increases toward the target temperature. At this time, as the temperature of the room air increases, the relative humidity of the room air decreases.

  If the relative humidity of the indoor air falls below the target humidity before the temperature of the indoor air reaches the target temperature, the control is switched to the heating / humidifying operation mode by the above control. Humidification operation is performed.

  As described above, according to the indoor unit of the present embodiment, during heating operation, based on the temperature and humidity of room air detected by various sensors and the set target temperature and target humidity during heating operation, Since the four types of operation modes are appropriately switched so that the indoor air temperature and humidity are maintained at the target temperature and the target humidity, respectively, the indoor air temperature and humidity during the heating operation are made comfortable. Can keep.

  In the above embodiment, when the detected temperature and the detected humidity of the indoor air are both the target temperature and the target humidity, the control device performs control to execute the air blowing operation mode as in the conventional case. Alternatively, control for temporarily stopping the operation may be performed.

It is a figure which shows the internal structure of the indoor unit in the air conditioner of this invention. It is a figure which shows the structure of the refrigerant circuit in the air conditioner of FIG. It is a figure which shows the internal state at the time of the heating and humidification operation | movement of the indoor unit of the air conditioner of this invention. It is a figure which shows the state of the refrigerant circuit in the indoor unit of FIG. It is a figure which shows the internal state at the time of the heating operation of the indoor unit of the air conditioner of this invention. It is a figure which shows the state of the refrigerant circuit in the indoor unit of FIG. It is a figure which shows the internal state at the time of the humidification driving | operation of the indoor unit of the air conditioner of this invention. It is a figure which shows the state of the refrigerant circuit in the indoor unit of FIG. It is a figure which shows the internal state at the time of the dehumidification operation at the time of the indoor unit of the air conditioner of this invention. It is a figure which shows the state of the refrigerant circuit in the indoor unit of FIG. It is a figure which shows the operation | movement flow at the time of the heating operation by the indoor unit of the air conditioner of this invention, and the change of the temperature and humidity of indoor air. It is a figure which shows the internal state at the time of the heating and humidification operation | movement of the indoor unit of the conventional air conditioner. It is a figure which shows the state of the refrigerant circuit in the indoor unit of FIG. It is a figure which shows the internal state at the time of the ventilation driving | operation of the indoor unit of the conventional air conditioner. It is a figure which shows the state of the refrigerant circuit in the indoor unit of FIG. It is a figure which shows the operation | movement flow at the time of the heating operation by the indoor unit of the conventional air conditioner, and the change of the temperature and humidity of indoor air.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 1st heat exchanger, 2nd 2nd heat exchanger, 3 refrigerant | coolant piping, 3a connection piping, 4 flow control valve (expansion valve), 5 pressure sensor, 6 heat exchanger temperature sensor, 7 natural evaporation type humidifier , 8 Water supply piping, 9 Solenoid valve, 10 Blower, 11 Room temperature sensor, 12 Humidity sensor.

Claims (6)

The indoor air sucked from the room is configured to be blown into the room after passing through the plurality of heat exchangers by the blowing means, and moisture can be supplied from the outside at the time of humidification to the downstream side of at least one heat exchanger. An air conditioner indoor unit with a natural evaporative humidifier,
A first heat exchanger in which a natural evaporation humidifier is arranged on the downstream side;
A second heat exchanger in which a natural evaporative humidifier is not disposed on the downstream side;
The first heat exchanger and the second heat exchanger are connected by a connecting pipe, and the refrigerant supplied to the first heat exchanger is supplied to the second heat exchanger through the connecting pipe, A refrigerant circuit for discharging the refrigerant that has passed through both heat exchangers from the second heat exchanger;
A flow rate adjusting means for adjusting the flow rate of the refrigerant provided in the connection pipe and supplied from the first heat exchanger to the second heat exchanger;
Room temperature detecting means for detecting the temperature of indoor air;
Humidity detecting means for detecting the humidity of the indoor air;
During heating operation, based on the detected temperature and humidity of the indoor air, the water supply control to the natural evaporative humidifier and the second heat exchanger by adjusting the throttle of the flow rate adjustment means, Control means for controlling the operation mode switching operation;
An indoor unit of an air conditioner characterized by comprising: In the indoor unit of the air conditioner according to claim 1,
The control means starts supplying water to the natural evaporation humidifier when the detected temperature and humidity of the indoor air are less than the predetermined target temperature and target humidity, and fully opens the throttle of the flow rate adjusting means. An indoor unit of an air conditioner that performs control to execute a heating / humidification operation mode in which both heat exchangers are heated. The indoor unit of the air conditioner according to claim 1 or 2,
When the detected indoor air temperature is less than the predetermined target temperature and the detected indoor air humidity has reached the predetermined target humidity, the control means supplies the natural evaporative humidifier to the natural evaporation humidifier. An indoor unit for an air conditioner that performs control to stop the water supply and execute a heating operation mode in which both the heat exchangers are heated by fully opening the throttle of the flow rate adjusting means. In the indoor unit of the air conditioner as described in any one of Claim 1 to 3,
further,
Evaporating pressure detecting means for detecting the evaporating pressure of the refrigerant in the second heat exchanger;
Heat exchanger temperature detecting means for detecting the temperature of the second heat exchanger;
Have
The control means controls the supply of water to the natural evaporation humidifier based on the detected temperature and humidity of the indoor air, the evaporation pressure of the refrigerant in the second heat exchanger, and the temperature of the second heat exchanger. An air conditioner indoor unit that controls the second heat exchanger by adjusting the throttle of the flow rate adjusting means to control the switching operation of the air conditioning operation mode. In the indoor unit of the air conditioner according to claim 4,
The control means starts supplying water to the natural evaporation humidifier when the detected indoor air temperature has reached a predetermined target temperature and the detected indoor air humidity is less than the predetermined target humidity. At the same time, the dew point temperature of the indoor air is calculated based on the detected temperature and humidity of the indoor air, and is detected by the temperature of the second heat exchanger detected by the heat exchanger temperature detecting means and the evaporation pressure detecting means. Adjusting the throttle of the flow rate adjusting means while monitoring the evaporation pressure, the first heat exchanger is in a heating state, and the second heat exchanger is in a cooling state at a temperature equal to or higher than the dew point temperature obtained by calculation An air conditioner indoor unit that performs control to execute a humidifying operation mode. In the indoor unit of the air conditioner according to claim 4 or 5,
The control means supplies water to the natural evaporation humidifier when the detected indoor air temperature has reached a predetermined target temperature and the detected indoor air humidity exceeds the predetermined target humidity. Stops, calculates the dew point temperature of the indoor air based on the detected indoor air temperature and humidity, and detects the temperature of the second heat exchanger detected from the heat exchanger temperature detecting means and the evaporation pressure detecting means While adjusting the throttle of the flow rate adjusting means while monitoring the evaporation pressure, the first heat exchanger is in a heating state, and the second heat exchanger is in a cooling state at a temperature lower than the dew point temperature obtained by calculation. An air conditioner indoor unit that performs control to execute a dehumidifying operation mode during heating.