JP6185251B2 - Air conditioner - Google Patents

Air conditioner Download PDF

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JP6185251B2
JP6185251B2 JP2013024065A JP2013024065A JP6185251B2 JP 6185251 B2 JP6185251 B2 JP 6185251B2 JP 2013024065 A JP2013024065 A JP 2013024065A JP 2013024065 A JP2013024065 A JP 2013024065A JP 6185251 B2 JP6185251 B2 JP 6185251B2
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temperature
heat exchanger
indoor
rotation speed
indoor fan
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JP2014153008A (en
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藤本　知
知 藤本
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Sharp Corp
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Sharp Corp
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Priority to CN201480007522.2A priority patent/CN104969010B/en
Priority to PCT/JP2014/053050 priority patent/WO2014126046A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F3/1405—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification in which the humidity of the air is exclusively affected by contact with the evaporator of a closed-circuit cooling system or heat pump circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/76—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by means responsive to temperature, e.g. bimetal springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/20—Humidity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Description

本発明は、省エネルギの除湿運転を行う空気調和機に関する。   The present invention relates to an air conditioner that performs an energy-saving dehumidifying operation.

空気調和機において、除湿運転が行われると、室内空気は室内熱交換器により凝縮され、乾いた空気が室内に吹き出される。除湿運転として、冷房運転の弱運転が行われる。この運転では、湿度が低下するが、室温も低下して、ユーザに冷風感を与えることがある。   In the air conditioner, when the dehumidifying operation is performed, the indoor air is condensed by the indoor heat exchanger, and the dry air is blown out into the room. As the dehumidifying operation, a weak operation of the cooling operation is performed. In this operation, the humidity decreases, but the room temperature also decreases, which may give the user a feeling of cold air.

除湿運転時の室温の低下を防ぐために、特許文献１では、回転数可変の圧縮機の回転が通常の冷房運転時よりも低回転にされ、室内ファンの回転も低速にされる。これにより、室温の低下を防ぎながら除湿が行われる。   In order to prevent a decrease in the room temperature during the dehumidifying operation, in Patent Document 1, the rotation of the compressor with a variable number of rotations is set to be lower than that during the normal cooling operation, and the rotation of the indoor fan is also reduced. Thereby, dehumidification is performed while preventing a decrease in room temperature.

特開昭５９−１８５９３２号公報JP 59-185932 A

上記の除湿運転の場合、圧縮機の回転数が除湿運転時の最低回転数まで下がると、除湿能力が低下し、室内熱交換器の温度を下げることができなくなる。室内熱交換器の温度が所望の湿度の露点温度まで下がらないと、室内空気を凝縮できない。その結果、室温は下がるが、除湿ができないといった事態が起こる。   In the case of the above dehumidifying operation, when the rotational speed of the compressor is reduced to the minimum rotational speed during the dehumidifying operation, the dehumidifying capacity is lowered and the temperature of the indoor heat exchanger cannot be lowered. The indoor air cannot be condensed unless the temperature of the indoor heat exchanger decreases to the dew point temperature of the desired humidity. As a result, the room temperature decreases, but a situation in which dehumidification cannot be performed occurs.

本発明は、上記に鑑み、除湿能力を維持しながら室内熱交換器の温度を下げることにより、室温低下を抑えながら除湿を行える空気調和機の提供を目的とする。   In view of the above, an object of the present invention is to provide an air conditioner that can perform dehumidification while suppressing a decrease in room temperature by lowering the temperature of an indoor heat exchanger while maintaining dehumidification capability.

本発明の空気調和機は、圧縮機、室外熱交換器、絞り装置、室内熱交換器から冷凍サイクルが形成され、室内熱交換器に室内空気を送る室内ファンと、空調運転に応じて圧縮機の回転数を制御し、圧縮機の回転数に応じて室内ファンを駆動制御する制御装置とを備えたものである。室内熱交換器の温度を検出する温度検出器と、室内の湿度を検出する湿度検出器とが設けられ、制御装置は、除湿運転を行うとき、室内熱交換器の温度が検出された室内湿度よりも低い湿度の露点温度になるように、室内ファンの送風能力を低下させる補正制御を行う。   The air conditioner of the present invention includes an indoor fan in which a refrigeration cycle is formed from a compressor, an outdoor heat exchanger, a throttle device, and an indoor heat exchanger, and sends indoor air to the indoor heat exchanger, and a compressor according to an air conditioning operation. And a control device that drives and controls the indoor fan in accordance with the rotational speed of the compressor. A temperature detector that detects the temperature of the indoor heat exchanger and a humidity detector that detects the humidity of the room are provided, and the controller detects the indoor humidity at which the temperature of the indoor heat exchanger is detected during the dehumidifying operation. Correction control is performed to reduce the blowing capacity of the indoor fan so that the dew point temperature has a lower humidity.

除湿運転を行うとき、室内ファンの送風能力を低下させることにより、室内熱交換器の温度が下がりやすくなるとともに、室内に吹き出す冷風の風量も低減できる。これにより、顕熱冷房能力が低くなり、室温の低下を抑制できる。そして、室内熱交換器の温度が検出された室内湿度の露点温度よりも低い湿度の露点温度になることにより、室内の湿度が目標とする湿度になる。   When the dehumidifying operation is performed, the temperature of the indoor heat exchanger is easily lowered by reducing the blowing capacity of the indoor fan, and the amount of cold air blown into the room can be reduced. Thereby, sensible heat cooling capability becomes low and the fall of room temperature can be suppressed. And the indoor humidity becomes the target humidity when the temperature of the indoor heat exchanger becomes a dew point temperature lower than the dew point temperature of the detected indoor humidity.

室内ファンは圧縮機の回転数に対応した基準回転数で駆動され、除湿運転時に制御装置は、室内ファンの回転数を基準回転数より低い回転数に設定して、室内熱交換器の温度に応じて室内ファンの回転数を変化させるようにしてもよい。室内ファンの回転数が低くなることにより、室内熱交換器を通る風量が減るので、送風能力が低下する。そして、室内ファンの回転数を変化させることにより、室内熱交換器の温度を目標とする湿度の露点温度に維持でき、所望の除湿を行える。
なお、制御装置は、室内ファンの回転数を最低回転数未満にならないように室内ファンを制御してもよい。すなわち、除湿運転時、室内ファンは最低回転数以上で駆動される。これにより、室内ファンの回転数が最低回転数より低くなって、回転が不安定になることを回避できる。 The indoor fan is driven at a reference rotational speed corresponding to the rotational speed of the compressor, and during the dehumidifying operation, the control device sets the rotational speed of the indoor fan to a rotational speed lower than the reference rotational speed and adjusts to the temperature of the indoor heat exchanger. Accordingly, the rotation speed of the indoor fan may be changed. When the number of rotations of the indoor fan is reduced, the amount of air passing through the indoor heat exchanger is reduced, so that the air blowing capability is reduced. And by changing the rotation speed of an indoor fan, the temperature of an indoor heat exchanger can be maintained at the dew point temperature of the target humidity, and desired dehumidification can be performed.
Note that the control device may control the indoor fan so that the rotation speed of the indoor fan does not become less than the minimum rotation speed. That is, during the dehumidifying operation, the indoor fan is driven at a minimum rotational speed or more. Thereby, it can avoid that rotation speed of an indoor fan becomes lower than minimum rotation speed, and rotation becomes unstable.

制御装置は、圧縮機の回転数が所定回転数以下のとき、補正制御を行い、圧縮機の回転数が所定回転数より大のとき、補正制御を行わないようにしてもよい。圧縮機の回転数が所定回転数より大のとき、室内熱交換器の温度は露点温度より低くなっている可能性がある。室内熱交換器の温度が露点温度より低いときに、補正制御を行うと、さらに室内熱交換器の温度が下がり、室内熱交換器が凍結するおそれがある。そのため、室内熱交換器の温度を下げなくても、除湿することができ、補正制御を行う必要がない。   The control device may perform correction control when the rotation speed of the compressor is equal to or less than the predetermined rotation speed, and may not perform correction control when the rotation speed of the compressor is greater than the predetermined rotation speed. When the rotation speed of the compressor is larger than the predetermined rotation speed, the temperature of the indoor heat exchanger may be lower than the dew point temperature. If correction control is performed when the temperature of the indoor heat exchanger is lower than the dew point temperature, the temperature of the indoor heat exchanger may further decrease and the indoor heat exchanger may freeze. Therefore, it is possible to dehumidify without lowering the temperature of the indoor heat exchanger, and there is no need to perform correction control.

制御装置は、圧縮機の回転数の変化に応じて基準回転数を変化させるとき、変化前の室内ファンの回転数の補正値を維持したまま室内ファンの回転数を変化させるようにしてもよい。圧縮機の回転数の変化に伴って、室内ファンの基準回転数は変化するが、変化の前後で室内ファンの回転数の補正値を同じにすることにより、除湿能力を維持できる。   The control device may change the rotation speed of the indoor fan while maintaining the correction value of the rotation speed of the indoor fan before the change when changing the reference rotation speed in accordance with the change in the rotation speed of the compressor. . Although the reference rotation speed of the indoor fan changes with the change in the rotation speed of the compressor, the dehumidification capability can be maintained by making the correction value for the rotation speed of the indoor fan the same before and after the change.

前記露点温度より低い下限温度が設定され、制御装置は、室内熱交換器の温度が下限温度より高いとき、補正制御を行い、室内熱交換器の温度が下限温度以下のとき、補正制御を行わないようにしてもよい。室内熱交換器の温度が下がり過ぎると、室内熱交換器が凍結するおそれが生じる。この凍結を防ぐために、室内熱交換器の温度に下限温度が設定される。室内熱交換器の温度が下限温度以下になると、室内ファンの回転数を上げるように室内ファンが制御される。これにより、室内熱交換器の温度が上昇して、凍結を未然に防ぐことができる。   A lower limit temperature lower than the dew point temperature is set, and the control device performs correction control when the temperature of the indoor heat exchanger is higher than the lower limit temperature, and performs correction control when the temperature of the indoor heat exchanger is equal to or lower than the lower limit temperature. It may not be possible. If the temperature of the indoor heat exchanger is too low, the indoor heat exchanger may be frozen. In order to prevent this freezing, a lower limit temperature is set to the temperature of the indoor heat exchanger. When the temperature of the indoor heat exchanger becomes equal to or lower than the lower limit temperature, the indoor fan is controlled so as to increase the rotation speed of the indoor fan. Thereby, the temperature of an indoor heat exchanger rises and it can prevent freezing beforehand.

室内熱交換器の温度が下限温度より低くなると、室内熱交換器の凍結のおそれがあり、凍結すると除湿能力が下がる。そこで、室内熱交換器の温度が下限温度以下になると、室内ファンの回転数を上げることにより、室内熱交換器の温度を上昇させ、凍結を未然に防ぐ。また、室内熱交換器の温度が下限温度より低くなると、圧縮機の回転数が下げられる場合がある。これにより、室内熱交換器６の温度の低下が抑えられるが、除湿能力は低下する。しかし、補正制御を行わないことにより、室内ファンの回転数は上がるので、室内熱交換器の温度が上がる。室内熱交換器の温度が露点温度に近づくと、再び補正制御が行われ、室内ファンの回転数が下げられ、除湿能力が回復する。   When the temperature of the indoor heat exchanger becomes lower than the lower limit temperature, the indoor heat exchanger may be frozen, and when it is frozen, the dehumidifying ability is lowered. Therefore, when the temperature of the indoor heat exchanger becomes equal to or lower than the lower limit temperature, the temperature of the indoor heat exchanger is increased by increasing the rotation speed of the indoor fan, thereby preventing freezing. Moreover, when the temperature of the indoor heat exchanger becomes lower than the lower limit temperature, the rotational speed of the compressor may be lowered. Thereby, although the fall of the temperature of the indoor heat exchanger 6 is suppressed, dehumidification capability falls. However, by not performing the correction control, the number of rotations of the indoor fan increases, so that the temperature of the indoor heat exchanger increases. When the temperature of the indoor heat exchanger approaches the dew point temperature, correction control is performed again, the number of rotations of the indoor fan is lowered, and the dehumidifying capacity is restored.

送風方向を制御するルーバが設けられ、室内ファンの送風能力が低下したとき、制御装置は、ルーバを動作させて、送風方向を変化させるようにしてもよい。これにより、ユーザに直接冷風を当たりにくくすることができ、ユーザに対して、一定の温度に保たれた快適な空間を提供できる。   When the louver which controls a ventilation direction is provided and the ventilation capability of an indoor fan falls, a control apparatus may operate a louver and may make it change a ventilation direction. Thereby, it is possible to make it difficult for the user to directly hit the cold air, and it is possible to provide the user with a comfortable space maintained at a constant temperature.

本発明によると、室内ファンの回転数を下げることにより、圧縮機の回転数が低い状態でも、室内熱交換器の温度を目標とする湿度の露点温度まで下げることができ、室温の低下させずに除湿を行える。しかも、室内ファンの消費電力を低減でき、省エネルギの除湿運転を実現できる。   According to the present invention, by reducing the rotation speed of the indoor fan, the temperature of the indoor heat exchanger can be lowered to the target humidity dew point temperature even when the rotation speed of the compressor is low, without lowering the room temperature. Can be dehumidified. In addition, the power consumption of the indoor fan can be reduced, and an energy-saving dehumidifying operation can be realized.

本発明の空気調和機の冷凍サイクルの概略構成図Schematic configuration diagram of the refrigeration cycle of the air conditioner of the present invention 空気調和機の制御装置のブロック図Air conditioner control device block diagram 室内熱交換器の温度に対する室内ファンの回転数の変化を示す図The figure which shows the change of the rotation speed of an indoor fan with respect to the temperature of an indoor heat exchanger 室内熱交換器の温度が運転下限温度になったときの室内ファンの回転数の変化を示す図The figure which shows the change of the rotation speed of an indoor fan when the temperature of an indoor heat exchanger becomes an operation | movement minimum temperature.

本実施形態の空気調和機を図１に示す。本空気調和機は、室外機と室内機とが配管および配線により接続されて構成される。室外機は、圧縮機１、四方弁２、室外熱交換器３、絞り装置４、室外ファン５を備える。室内機は、室内熱交換器６、室内ファン７を備える。圧縮機１、四方弁２、室外熱交換器３、絞り装置４、室内熱交換器６により冷凍サイクルが形成される。なお、絞り装置４として、膨張弁を使用しているが、キャピラリチューブなどを使用してもよい。   The air conditioner of this embodiment is shown in FIG. This air conditioner is configured by connecting an outdoor unit and an indoor unit by piping and wiring. The outdoor unit includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an expansion device 4, and an outdoor fan 5. The indoor unit includes an indoor heat exchanger 6 and an indoor fan 7. A refrigeration cycle is formed by the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the expansion device 4, and the indoor heat exchanger 6. Although the expansion valve is used as the expansion device 4, a capillary tube or the like may be used.

そして、図２に示すように、空気調和機は、冷凍サイクルを制御して、冷房、暖房、除湿などの空調運転を行う制御装置１０を備えている。室外機に、外気温検出器１１が設けられ、室内機に、室温検出器１２および湿度検出器１３が設けられる。また、室内熱交換器６の温度を検出する室内熱交換器温度検出器１４が設けられる。制御装置１０は、指定された空調運転に応じて、各温度検出器１１，１２，１４、湿度検出器１３によって検出された温度や湿度に基づいて圧縮機１の回転、絞り装置４の開度、室外ファン５の回転、室内ファン７の回転をそれぞれ制御する。   As shown in FIG. 2, the air conditioner includes a control device 10 that controls the refrigeration cycle and performs air conditioning operations such as cooling, heating, and dehumidification. An outdoor air temperature detector 11 is provided in the outdoor unit, and a room temperature detector 12 and a humidity detector 13 are provided in the indoor unit. Moreover, the indoor heat exchanger temperature detector 14 which detects the temperature of the indoor heat exchanger 6 is provided. The control device 10 rotates the compressor 1 based on the temperature and humidity detected by the temperature detectors 11, 12, 14 and the humidity detector 13 according to the designated air conditioning operation, and the opening degree of the expansion device 4. The rotation of the outdoor fan 5 and the rotation of the indoor fan 7 are controlled.

ここで、制御装置１０は、ユーザにより設定された設定温度あるいは自動運転モード時に予め設定された設定温度と検出された室温、外気温に基づいて、圧縮機１の回転数を決める。そして、圧縮機１の回転数に対応して、室内ファン７の回転数が決定される。制御装置１０は、決められた回転数で圧縮機１を制御し、室温に応じて圧縮機１の回転数を変化させるとともに、圧縮機１の回転数に応じた回転数に基づいて室内ファン７を制御する。   Here, the control apparatus 10 determines the rotation speed of the compressor 1 based on the set temperature set by the user or the preset temperature set in the automatic operation mode and the detected room temperature and outside air temperature. Then, the rotational speed of the indoor fan 7 is determined in accordance with the rotational speed of the compressor 1. The control device 10 controls the compressor 1 at a determined rotational speed, changes the rotational speed of the compressor 1 in accordance with the room temperature, and based on the rotational speed in accordance with the rotational speed of the compressor 1, the indoor fan 7. To control.

圧縮機１の回転数は段階的に設定され、圧縮機１の各回転数に対応して室内ファン７の基準回転数が設定されている。この基準回転数も段階的に設定されている。冷房運転などの空調運転毎に、圧縮機１および室内ファン７の回転数の対応関係を示したテーブルが不揮発性メモリに記憶されている。例えば、冷房運転の場合、以下の通りである。

圧縮機回転数 ＦＤ１ ＦＤ２ ＦＤ３ ・・・・・ＦＤ９
（ｒｐｍ） ４００ １１７５ １９５０・・・・・４６００
冷房運転時
ファン回転数 Ｆ３ Ｆ４ Ｆ５ ・・・・・Ｆ８
（ｒｐｍ） ８００ ８５０ ９３０ ・・・・・１１１０ The rotational speed of the compressor 1 is set in stages, and the reference rotational speed of the indoor fan 7 is set corresponding to each rotational speed of the compressor 1. This reference rotational speed is also set in stages. For each air conditioning operation such as a cooling operation, a table showing the correspondence between the rotation speeds of the compressor 1 and the indoor fan 7 is stored in the nonvolatile memory. For example, the cooling operation is as follows.

Compressor speed FD1 FD2 FD3 ... FD9
(Rpm) 400 1175 1950 4600
Fan speed during cooling operation F3 F4 F5 ・ ・ ・ ・ ・ F8
(Rpm) 800 850 930 1110

冷房運転時、圧縮機１の回転数がＦＤ１（４００ｒｐｍ）のとき、室内ファン７の基準回転数はＦ３（８００ｒｐｍ）、圧縮機１の回転数がＦＤ２（１１７５ｒｐｍ）のとき、室内ファン７の基準回転数はＦ４（８５０ｒｐｍ）とされる。制御装置１０は、空調運転中、室温、外気温などに応じてテーブルから適切な回転数を選び、この回転数に応じて室内ファン７の基準回転数を決める。なお、本空気調和機では、圧縮機１の回転数はＦＤ１〜ＦＤ９までの９段階に設定されている。室内ファン７の回転数はＦ１〜Ｆ８までの８段階に設定されている。ここで、圧縮機１と室内ファン７とでは回転数の段階数が異なるが、例えばＦＤ５のときの基準回転数とＦＤ６のときの基準回転数とが同じＦ７にされるので、室内ファン７の段階数が少なくなる。ただし、圧縮機１での段階数に応じて室内ファン７での段階数を同じにしてもよく、さらに段階数は９段階に限るものではない。   During cooling operation, when the rotation speed of the compressor 1 is FD1 (400 rpm), the reference rotation speed of the indoor fan 7 is F3 (800 rpm), and when the rotation speed of the compressor 1 is FD2 (1175 rpm), the reference of the indoor fan 7 The rotation speed is F4 (850 rpm). During the air conditioning operation, the control device 10 selects an appropriate rotation speed from the table according to the room temperature, the outside air temperature, and the like, and determines the reference rotation speed of the indoor fan 7 according to the rotation speed. In this air conditioner, the number of rotations of the compressor 1 is set to nine stages from FD1 to FD9. The number of rotations of the indoor fan 7 is set in eight stages from F1 to F8. Here, although the compressor 1 and the indoor fan 7 have different rotational speeds, for example, the reference rotational speed at FD5 and the reference rotational speed at FD6 are set to the same F7. The number of stages is reduced. However, the number of stages in the indoor fan 7 may be the same according to the number of stages in the compressor 1, and the number of stages is not limited to nine.

また、制御装置１０は、空調運転を行うとき、室内ファン７の回転数が基準回転数を超えないように、設定温度と室温に応じて室内ファン７の回転数を変化させる。また、室内ファン７の回転が不安定とならないように、最低回転数が決められる。最低回転数は、例えば３００ｒｐｍとされる。なお、最低回転数は室内ファン７に使用されるモータの仕様などに基づいて決定される。制御装置１０は、最低回転数以上で室内ファン７の回転数を変化させ、最低回転数未満にならないようにする。すなわち、室内ファン７の回転数は、最低回転数と基準回転数との間で変化する。   Moreover, the control apparatus 10 changes the rotation speed of the indoor fan 7 according to setting temperature and room temperature so that the rotation speed of the indoor fan 7 may not exceed reference | standard rotation speed, when performing an air-conditioning driving | operation. Further, the minimum number of rotations is determined so that the rotation of the indoor fan 7 does not become unstable. The minimum rotation speed is, for example, 300 rpm. The minimum number of revolutions is determined based on the specifications of the motor used for the indoor fan 7. The control device 10 changes the rotation speed of the indoor fan 7 at the minimum rotation speed or more so that it does not become less than the minimum rotation speed. That is, the rotation speed of the indoor fan 7 changes between the minimum rotation speed and the reference rotation speed.

除湿運転では、弱冷房運転が行われるが、室温を低下させずに除湿を行えるように、室内の湿度を監視しながら、冷房運転に比べて室内ファン７の送風能力を低下させる補正制御が行われる。すなわち、制御装置１０は、室内熱交換器６の温度が検出された室内湿度よりも低い目標湿度の露点温度になるように、室内ファン７の回転数を基準回転数より低い回転数にして、室内熱交換器６の温度に応じて室内ファン７の回転数を変化させる補正制御を行う。   In the dehumidifying operation, a weak cooling operation is performed, but correction control is performed to reduce the blowing capacity of the indoor fan 7 as compared to the cooling operation while monitoring the indoor humidity so that the dehumidification can be performed without lowering the room temperature. Is called. That is, the control device 10 sets the rotational speed of the indoor fan 7 to a rotational speed lower than the reference rotational speed so that the temperature of the indoor heat exchanger 6 becomes the dew point temperature of the target humidity lower than the detected indoor humidity. Correction control for changing the rotational speed of the indoor fan 7 in accordance with the temperature of the indoor heat exchanger 6 is performed.

除湿運転時の室内ファン７の基準回転数が以下のように設定される。制御装置１０は、除湿運転の開始時、設定された基準回転数で室内ファン７を駆動する。そして、除湿運転に伴って室内熱交換器６の温度が変化すると、制御装置１０は、露点温度に対する室内熱交換器６の温度に応じて室内ファン７の回転数を変化させる。なお、外気温や室温が変化して、圧縮機１の回転数が変化したとき、室内ファン７の基準回転数も変更される。室内ファン７の回転数は、最低回転数と基準回転数との間で変化する。

圧縮機回転数 ＦＤ１ ＦＤ２ ＦＤ３ ・・・ＦＤ７
（ｒｐｍ） ４００ １１７５ １９５０・・・３５００
除湿運転時
ファン回転数 Ｆ１ Ｆ２ Ｆ３ ・・・Ｆ８
（ｒｐｍ） ７００ ７５０ ８００ ・・・１１１０ The reference rotational speed of the indoor fan 7 during the dehumidifying operation is set as follows. The control device 10 drives the indoor fan 7 at the set reference rotational speed at the start of the dehumidifying operation. And if the temperature of the indoor heat exchanger 6 changes with dehumidification operation, the control apparatus 10 will change the rotation speed of the indoor fan 7 according to the temperature of the indoor heat exchanger 6 with respect to dew point temperature. When the outside air temperature or the room temperature changes and the rotation speed of the compressor 1 changes, the reference rotation speed of the indoor fan 7 is also changed. The rotation speed of the indoor fan 7 changes between the minimum rotation speed and the reference rotation speed.

Compressor rotational speed FD1 FD2 FD3 ... FD7
(Rpm) 400 1175 1950 ... 3500
Fan speed during dehumidification operation F1 F2 F3 ... F8
(Rpm) 700 750 800... 1110

ユーザがリモコンを操作して、除湿運転を指示する、あるいは自動運転モードにおいて除湿運転が行われるとき、制御装置１０は、まず通常の除湿運転である冷房の弱運転（弱冷房運転）を行う。補正制御は、除湿運転が開始されてから所定時間、例えば１５分経過したときに実行される。除湿運転の開始時、室温が高い場合がある。補正制御では、弱冷房運転に比べて冷房能力が低いので、室温を設定温度に近付けるのに時間がかかり過ぎる。そこで、制御装置１０は、除湿運転の開始時には、補正制御を行わず、所定時間経過したときに補正制御を行う。通常の弱冷房運転でも室内熱交換器６の温度が露点温度以下に下がる場合には除湿能力があるので、除湿できる。   When the user operates the remote controller to instruct the dehumidifying operation or the dehumidifying operation is performed in the automatic operation mode, the control device 10 first performs a weak cooling operation (weak cooling operation) that is a normal dehumidifying operation. The correction control is executed when a predetermined time, for example, 15 minutes has elapsed since the start of the dehumidifying operation. Room temperature may be high at the start of dehumidifying operation. In the correction control, since the cooling capacity is lower than that in the weak cooling operation, it takes too much time to bring the room temperature close to the set temperature. Therefore, the control device 10 does not perform correction control at the start of the dehumidifying operation, but performs correction control when a predetermined time has elapsed. Even in normal weak cooling operation, when the temperature of the indoor heat exchanger 6 falls below the dew point temperature, it has a dehumidifying ability, and therefore can be dehumidified.

所定時間が経過すると、制御装置１０は、室内ファン７の回転数を下げることにより送風能力を低下させる補正制御を開始する。所定時間経過してから補正制御を行うことにより、設定温度になっている室温を下げずに除湿でき、室内の冷え過ぎを防ぐことができる。したがって、室温が設定温度に達してから補正制御を行うことができ、室温を下げずに除湿できるといった補正制御の特性を有効的に活用できる。   When the predetermined time has elapsed, the control device 10 starts correction control for reducing the blowing capacity by lowering the rotational speed of the indoor fan 7. By performing the correction control after a predetermined time has elapsed, dehumidification can be performed without lowering the room temperature that is the set temperature, and the room can be prevented from being overcooled. Therefore, the correction control can be performed after the room temperature reaches the set temperature, and the correction control characteristic that the dehumidification can be performed without lowering the room temperature can be effectively utilized.

制御装置１０は、補正制御を行うとき、室温検出器１２から現在の室温を読み取り、湿度検出器１３から現在の室内の湿度を読み取る。そして、制御装置１０は、現在の湿度より一定値α％低い目標湿度を設定する。一定値αは、予め決められた値（０〜３０％）であって、不揮発性メモリに記憶されている。さらに、制御装置１０は、目標湿度よりβ％、例えば５％だけ低い湿度を下限湿度として設定する。   When performing the correction control, the control device 10 reads the current room temperature from the room temperature detector 12 and reads the current room humidity from the humidity detector 13. Then, the control device 10 sets a target humidity that is a constant value α% lower than the current humidity. The constant value α is a predetermined value (0 to 30%) and is stored in the nonvolatile memory. Furthermore, the control apparatus 10 sets the humidity lower by β%, for example, 5% than the target humidity, as the lower limit humidity.

制御装置１０は、現在の室温Ｔａと目標湿度ＲＨｏから目標湿度の露点温度ＤＰｏを次式より算出する。
ＤＰｏ＝−０．００３２×ＲＨｏ２＋０．６５×ＲＨｏ＋Ｔａ−３５ The control apparatus 10 calculates the dew point temperature DPo of the target humidity from the current room temperature Ta and the target humidity RHo using the following equation.
DPo = −0.0032 × RHo 2 + 0.65 × RHo + Ta−35

算出された露点温度が室内熱交換器６の目標温度ＤＰｏ（α）とされる。さらに制御装置１０は、下限湿度の露点温度も算出する。算出された露点温度が室内熱交換器６の下限温度ＤＰｏ（α＋β）とされる。   The calculated dew point temperature is set as the target temperature DPo (α) of the indoor heat exchanger 6. Furthermore, the control device 10 also calculates the dew point temperature of the lower limit humidity. The calculated dew point temperature is set as the lower limit temperature DPo (α + β) of the indoor heat exchanger 6.

補正制御において、制御装置１０は、室内熱交換器６の温度が目標温度と下限温度との間になるように、室内ファン７の回転を制御する。すなわち、制御装置１０は、除湿運転の開始時、室内ファン７の回転数を冷房運転時の基準回転数より低い基準回転数で室内ファン７を駆動させる。そして、制御装置１０は、検出された室内熱交換器６の温度に応じて、一定間隔で室内ファン７の回転数を変化させる否かを判断し、変化させる場合、所定回転数ずつ変化させる。例えば、１分間隔で１０ｒｐｍ単位で回転数を変化させる。なお、変化幅は０〜３０ｒｐｍの範囲で設定される。   In the correction control, the control device 10 controls the rotation of the indoor fan 7 so that the temperature of the indoor heat exchanger 6 is between the target temperature and the lower limit temperature. That is, at the start of the dehumidifying operation, the control device 10 drives the indoor fan 7 at a reference rotational speed that is lower than the reference rotational speed during the cooling operation. Then, the control device 10 determines whether or not to change the rotational speed of the indoor fan 7 at regular intervals according to the detected temperature of the indoor heat exchanger 6, and when changing the speed, changes it by a predetermined rotational speed. For example, the rotation speed is changed in units of 10 rpm at 1 minute intervals. The change width is set in the range of 0 to 30 rpm.

図３に示すように、室内熱交換器６の温度Ｔｅｘａが目標温度ＤＰｏ（α）より高いとき、制御装置１０は、室内ファン７の回転数を下げるように制御する。これにより、室内熱交換器６を通る室内空気の風量が低下し、室内熱交換器６を通過する冷媒の蒸発量が減少して、室内熱交換器６の温度が低下していく。室内熱交換器６の温度Ｔｅｘａが目標温度ＤＰｏ（α）以下になると、制御装置１０は、室内ファン７の回転数を変えずに維持する。室内熱交換器６の温度Ｔｅｘａが下限温度ＤＰｏ（α＋β）以下になると、制御装置１０は、室内ファン７の回転数を上げるように制御する。このように、室内熱交換器６の温度が下限温度と目標温度との間になるように、室内ファン７の回転が制御される。   As shown in FIG. 3, when the temperature Texa of the indoor heat exchanger 6 is higher than the target temperature DPo (α), the control device 10 performs control so as to decrease the rotational speed of the indoor fan 7. Thereby, the air volume of the indoor air passing through the indoor heat exchanger 6 decreases, the evaporation amount of the refrigerant passing through the indoor heat exchanger 6 decreases, and the temperature of the indoor heat exchanger 6 decreases. When the temperature Texa of the indoor heat exchanger 6 becomes equal to or lower than the target temperature DPo (α), the control device 10 maintains the rotation speed of the indoor fan 7 without changing it. When the temperature Texa of the indoor heat exchanger 6 becomes equal to or lower than the lower limit temperature DPo (α + β), the control device 10 controls to increase the rotational speed of the indoor fan 7. Thus, the rotation of the indoor fan 7 is controlled so that the temperature of the indoor heat exchanger 6 is between the lower limit temperature and the target temperature.

室内熱交換器６の温度が下限温度よりも下がらないようすることにより、室内熱交換器６の温度が下がり過ぎて、室内熱交換器６が凍結することを防ぐことができる。しかも、下限湿度を設定しておくことにより、目標湿度よりも少しだけ低い湿度までしか下がらず、室内が乾燥しすぎるのを防止できるとともに、風量低下による冷房能力や除湿能力の過度の低下を防止できる。   By preventing the temperature of the indoor heat exchanger 6 from falling below the lower limit temperature, it is possible to prevent the temperature of the indoor heat exchanger 6 from being excessively lowered and the indoor heat exchanger 6 to freeze. In addition, by setting the lower limit humidity, the humidity can be reduced to a little lower than the target humidity, preventing the room from drying out excessively, and preventing the cooling capacity and the dehumidifying capacity from being excessively reduced due to a decrease in the air volume. it can.

このような補正制御では、冷房運転時と圧縮機１の回転数は同じながら、冷房運転時より低い回転数で室内ファン７が駆動されることにより、室内熱交換器６を通る室内空気の風量が低下し、室内熱交換器６を通過する冷媒の蒸発量が減少する。室内熱交換器６の吸熱量が減少することにより、顕熱冷房能力が低下して、逆に潜熱冷房能力が増す。また、室内に吹き出す冷風の風量が減り、室温の低下を抑制できる。このようにして、冷凍サイクルの顕熱比を小さくすることができ、室温の低下を抑えながら室内の湿度を低下させることができる。そして、室内熱交換器６の温度を下限温度と目標温度との間になるように、低い回転数で室内ファン７を駆動することにより、室内を所望の湿度に保つことができる。このような補正制御によって、室内ファン７の消費電力を低減でき、省エネルギな除湿運転を実現できる。   In such correction control, while the rotational speed of the compressor 1 is the same as that during the cooling operation, the indoor fan 7 is driven at a lower rotational speed than during the cooling operation, so that the air volume of the indoor air passing through the indoor heat exchanger 6 is increased. And the evaporation amount of the refrigerant passing through the indoor heat exchanger 6 is reduced. As the amount of heat absorbed by the indoor heat exchanger 6 decreases, the sensible heat cooling capacity decreases, and conversely the latent heat cooling capacity increases. In addition, the amount of cold air blown into the room is reduced, and a decrease in room temperature can be suppressed. In this way, the sensible heat ratio of the refrigeration cycle can be reduced, and the indoor humidity can be reduced while suppressing a decrease in room temperature. Then, by driving the indoor fan 7 at a low rotational speed so that the temperature of the indoor heat exchanger 6 is between the lower limit temperature and the target temperature, the room can be kept at a desired humidity. By such correction control, the power consumption of the indoor fan 7 can be reduced, and an energy-saving dehumidifying operation can be realized.

ところで、室内ファン７の回転数が低下して、最低回転数より低くなると、回転制御が不安定となる。制御装置１０は、室内ファン７の回転数が最低回転数以上になるように、室内ファン７を制御する。例えば、室内熱交換器６の温度が目標温度ＤＰｏ（α）より高くても、室内ファン７の回転数を下げると、最低回転数よりも低くなる場合、室内ファン７の回転数は最低回転数以上に維持される。   By the way, when the rotation speed of the indoor fan 7 decreases and becomes lower than the minimum rotation speed, the rotation control becomes unstable. The control device 10 controls the indoor fan 7 so that the rotational speed of the indoor fan 7 is equal to or higher than the minimum rotational speed. For example, even if the temperature of the indoor heat exchanger 6 is higher than the target temperature DPo (α), if the rotational speed of the indoor fan 7 is lowered and becomes lower than the minimum rotational speed, the rotational speed of the indoor fan 7 is the minimum rotational speed. Maintained above.

また、室温が低く、室内の湿度が低いとき、目標湿度の露点温度、すなわち目標温度は低く設定される。この場合、室内熱交換器６の温度を目標温度になるように補正制御を行うと、室内熱交換器６の温度が少し下がると、運転下限温度、例えば５℃より低くなるおそれがある。室内熱交換器６の温度が運転下限温度より低くなると、制御装置１０は、凍結防止制御を行う。すなわち、制御装置１０は、室内熱交換器６の温度が運転下限温度より高いときに補正制御を行い、室内熱交換器６の温度が運転下限温度以下のとき、凍結防止制御を行う。凍結防止制御は補正制御よりも優先的に行われる。凍結防止制御では、室内熱交換器６の温度が運転下限温度以下になると、圧縮機１の回転数が下げられる。凍結防止制御が行われると、除湿能力が失われる。   When the room temperature is low and the indoor humidity is low, the dew point temperature of the target humidity, that is, the target temperature is set low. In this case, if correction control is performed so that the temperature of the indoor heat exchanger 6 becomes the target temperature, there is a possibility that if the temperature of the indoor heat exchanger 6 is slightly lowered, the temperature becomes lower than the operation lower limit temperature, for example, 5 ° C. When the temperature of the indoor heat exchanger 6 becomes lower than the operation lower limit temperature, the control device 10 performs anti-freezing control. That is, the control device 10 performs correction control when the temperature of the indoor heat exchanger 6 is higher than the operation lower limit temperature, and performs freeze prevention control when the temperature of the indoor heat exchanger 6 is equal to or lower than the operation lower limit temperature. Freezing prevention control is performed with priority over correction control. In the freeze prevention control, when the temperature of the indoor heat exchanger 6 becomes equal to or lower than the operation lower limit temperature, the rotation speed of the compressor 1 is lowered. When anti-freezing control is performed, the dehumidifying ability is lost.

そこで、除湿運転時、室内熱交換器６の温度が低下して、運転下限温度に近づいたとき、除湿能力を保持するために、図４に示すように、制御装置１０は、凍結防止制御が行われるのを避けるように補正制御を行う。すなわち、制御装置１０は、室内熱交換器６の温度が運転下限温度に近づいたとき、例えば６℃以下になると、室内ファン７の回転数の低下を中止する。さらに室内熱交換器６の温度が低下して、運転下限温度（５℃）以下になると、制御装置１０は、室内ファン７の回転数を上げる。室内熱交換器６の温度が上がって、６℃より高くなると、制御装置１０は、室内ファン７の回転数を下げないようにしながら補正制御を行う。室内熱交換器６の温度が７℃以上になると、制御装置１０は、室内ファン７の回転数を下げることが可能な通常の補正制御を行う。これにより、室内熱交換器６の温度が低くなっても、除湿能力を保持でき、室内を所望の湿度に保つことができる。   Therefore, during the dehumidifying operation, when the temperature of the indoor heat exchanger 6 decreases and approaches the operating lower limit temperature, as shown in FIG. Correction control is performed so as to avoid it. That is, when the temperature of the indoor heat exchanger 6 approaches the operation lower limit temperature, for example, when the temperature becomes 6 ° C. or less, the control device 10 stops the decrease in the rotational speed of the indoor fan 7. Further, when the temperature of the indoor heat exchanger 6 decreases and becomes lower than the operation lower limit temperature (5 ° C.), the control device 10 increases the rotational speed of the indoor fan 7. When the temperature of the indoor heat exchanger 6 rises and becomes higher than 6 ° C., the control device 10 performs correction control while keeping the rotational speed of the indoor fan 7 from decreasing. When the temperature of the indoor heat exchanger 6 reaches 7 ° C. or higher, the control device 10 performs normal correction control that can reduce the rotational speed of the indoor fan 7. Thereby, even if the temperature of the indoor heat exchanger 6 becomes low, the dehumidifying ability can be maintained and the room can be maintained at a desired humidity.

空調運転中、室温が設定温度に近づくと、圧縮機１の回転数が下がる。これに伴って、室内ファン７の基準回転数も下がる。除湿運転では、除湿能力を確保できるように圧縮機１の最小回転数、例えば１２００ｒｐｍが設定されている。除湿運転中、室温などに応じて圧縮機１の回転数が下げられ、最小回転数より低くなるとき、制御装置１０は、圧縮機１の回転数を最小回転数にして、補正制御を行う。   When the room temperature approaches the set temperature during the air conditioning operation, the rotation speed of the compressor 1 decreases. Along with this, the reference rotational speed of the indoor fan 7 also decreases. In the dehumidifying operation, the minimum rotation speed of the compressor 1, for example, 1200 rpm is set so as to ensure the dehumidifying capacity. During the dehumidifying operation, when the rotation speed of the compressor 1 is lowered according to room temperature or the like and becomes lower than the minimum rotation speed, the control device 10 sets the rotation speed of the compressor 1 to the minimum rotation speed and performs correction control.

圧縮機１の回転数がＦＤ１あるいはＦＤ２になるとき、これらの回転数は最小回転数（１２００ｒｐｍ）よりも低い。しかし、圧縮機１は最小回転数で駆動される。このとき、室内ファン７の基準回転数は、ＦＤ１あるいはＦＤ２に対応する７００ｒｐｍあるいは７５０ｒｐｍとされる。   When the rotation speed of the compressor 1 is FD1 or FD2, these rotation speeds are lower than the minimum rotation speed (1200 rpm). However, the compressor 1 is driven at the minimum rotational speed. At this time, the reference rotation speed of the indoor fan 7 is set to 700 rpm or 750 rpm corresponding to FD1 or FD2.

例えば、補正制御時において、室温などによって決められた圧縮機１の回転数がＦＤ２であり、室内ファン７が７００ｒｐｍで駆動されているとき、実際には最小回転数で圧縮機１は駆動され、室内ファン７は最低回転数（３００ｒｐｍ）と基準回転数（７５０ｒｐｍ）の間で制御される。   For example, at the time of correction control, when the rotational speed of the compressor 1 determined by room temperature or the like is FD2, and the indoor fan 7 is driven at 700 rpm, the compressor 1 is actually driven at the minimum rotational speed, The indoor fan 7 is controlled between a minimum rotation speed (300 rpm) and a reference rotation speed (750 rpm).

ここで、圧縮機１の回転数がＦＤ２からＦＤ１に変化するとき、圧縮機１は最小回転数のまま駆動され、室内ファン７の回転数は６５０ｒｐｍに変化する。この場合、室内ファン７の回転数の補正値は５０ｒｐｍであるが、室内ファン７の基準回転数が変化しても、回転数の補正値は変わらない。   Here, when the rotation speed of the compressor 1 changes from FD2 to FD1, the compressor 1 is driven with the minimum rotation speed, and the rotation speed of the indoor fan 7 changes to 650 rpm. In this case, the correction value of the rotation speed of the indoor fan 7 is 50 rpm, but the correction value of the rotation speed does not change even if the reference rotation speed of the indoor fan 7 changes.

このように、室内ファン７の基準回転数の変化の前後において、回転数の補正値は維持される。すなわち、制御装置１０は、圧縮機１の回転数の変化に応じて室内ファン７の基準回転数を変化させるとき、変化前の室内ファン７の回転数の補正値を維持したまま室内ファン７の回転数を変化させる。   Thus, the correction value of the rotational speed is maintained before and after the change of the reference rotational speed of the indoor fan 7. That is, when the control device 10 changes the reference rotational speed of the indoor fan 7 in accordance with the change in the rotational speed of the compressor 1, the control device 10 maintains the correction value for the rotational speed of the indoor fan 7 before the change. Change the rotation speed.

除湿運転中、室温が設定温度に達すると、制御装置１０は、圧縮機１を停止させるサーモオフ制御を行う。圧縮機が停止したとき、制御装置１０は、室内ファン７の回転数を維持したまま駆動を継続させる。ただし、室内の湿度が目標湿度より低いとき、制御装置１０は、室内ファン７を停止させる。圧縮機１が停止してしばらく経過すると、室温が設定温度よりも高くなるので、制御装置１０は、圧縮機１を起動する。圧縮機１の起動後、一定時間、例えば５分が経過するまでは、制御装置１０は、補正制御を行わず、回転数を維持したまま室内ファン７を駆動する。一定時間経過すると、制御装置１０は、補正制御を再開して、室内ファン７の回転数を変化させる。なお、室内ファン７が停止しているとき、補正制御が再開されたときの室内熱交換器６の温度が目標温度より高い場合、制御装置１０は、室内ファン７を最低回転数で駆動する。室内熱交換器６の温度が目標温度以下の場合、制御装置１０は、室内ファン７を基準回転数で駆動する。これにより、圧縮機１のオフ→オン後の安定した冷凍サイクル形成前における室内熱交換器６の急激な温度変化による室内ファン７の回転数変化を安定させることができる。   When the room temperature reaches the set temperature during the dehumidifying operation, the control device 10 performs thermo-off control for stopping the compressor 1. When the compressor stops, the control device 10 continues driving while maintaining the rotation speed of the indoor fan 7. However, when the indoor humidity is lower than the target humidity, the control device 10 stops the indoor fan 7. After a while since the compressor 1 is stopped, the room temperature becomes higher than the set temperature, so the control device 10 starts the compressor 1. Until a predetermined time, for example, 5 minutes elapses after the compressor 1 is started, the control device 10 does not perform the correction control and drives the indoor fan 7 while maintaining the rotation speed. When a certain time has elapsed, the control device 10 resumes the correction control and changes the rotational speed of the indoor fan 7. When the indoor fan 7 is stopped and the temperature of the indoor heat exchanger 6 when the correction control is resumed is higher than the target temperature, the control device 10 drives the indoor fan 7 at the minimum rotational speed. When the temperature of the indoor heat exchanger 6 is equal to or lower than the target temperature, the control device 10 drives the indoor fan 7 at the reference rotational speed. Thereby, the rotation speed change of the indoor fan 7 by the rapid temperature change of the indoor heat exchanger 6 before the formation of the stable refrigeration cycle after turning off the compressor 1 can be stabilized.

除湿運転において、所定時間経過後に補正制御を開始するとき、室内熱交換器６の温度が目標温度よりも低い場合がある。例えば、圧縮機１の回転数が高いとき、低温の冷媒が室内熱交換器６に流入するので、室内熱交換器６の温度が低下する。このような場合、制御装置１０は、検出された室内熱交換器６の温度が目標温度より低いことを確認すると、補正制御を行わず、送風能力を低下させない除湿運転を行う。すなわち、室内ファン７は圧縮機１の回転数に応じて決まる基準回転数で駆動される。その後、室内熱交換器６の温度が上昇して、目標温度以上になると、制御装置１０は、補正制御を行い、室内ファン７の回転数を下げるように室内ファン７の制御を行う。   In the dehumidifying operation, when the correction control is started after elapse of a predetermined time, the temperature of the indoor heat exchanger 6 may be lower than the target temperature. For example, when the rotational speed of the compressor 1 is high, a low-temperature refrigerant flows into the indoor heat exchanger 6, so the temperature of the indoor heat exchanger 6 decreases. In such a case, when it is confirmed that the detected temperature of the indoor heat exchanger 6 is lower than the target temperature, the control device 10 performs the dehumidifying operation without performing the correction control and reducing the blowing capacity. That is, the indoor fan 7 is driven at a reference rotational speed determined according to the rotational speed of the compressor 1. Thereafter, when the temperature of the indoor heat exchanger 6 rises and becomes equal to or higher than the target temperature, the control device 10 performs correction control and controls the indoor fan 7 so as to reduce the rotational speed of the indoor fan 7.

室内熱交換器６の温度が目標湿度の露点温度より低い場合、室内ファン７の回転数を下げずに除湿運転を行うので、室内熱交換器６の温度が低くなり過ぎない。これにより、凍結防止制御が行われて、除湿能力が低下することを防止でき、しかも低温の風が吹き出して、室内機に結露することも防止できる。   When the temperature of the indoor heat exchanger 6 is lower than the dew point temperature of the target humidity, the dehumidifying operation is performed without reducing the rotational speed of the indoor fan 7, so the temperature of the indoor heat exchanger 6 does not become too low. As a result, anti-freezing control is performed, and it is possible to prevent the dehumidifying ability from being lowered, and it is also possible to prevent dew condensation on the indoor unit due to low temperature wind blowing.

除湿運転中、室内熱交換器６の温度に応じて室内ファン７の回転数を変化させる補正制御が行われる。また、室内ファン７の回転数は圧縮機１の回転に応じて変化する。上記の第１の実施形態の補正制御では、圧縮機１の回転数が変化するとき、室内ファン７の回転数の補正値が維持され、変化後の圧縮機１の回転数に対応する基準回転数から補正値だけ下がった回転数となる。この場合、室内ファン７の回転数が変化しても、除湿能力を維持できる。   During the dehumidifying operation, correction control for changing the rotational speed of the indoor fan 7 according to the temperature of the indoor heat exchanger 6 is performed. Further, the rotational speed of the indoor fan 7 changes according to the rotation of the compressor 1. In the correction control of the first embodiment, when the rotation speed of the compressor 1 changes, the correction value of the rotation speed of the indoor fan 7 is maintained, and the reference rotation corresponding to the rotation speed of the compressor 1 after the change. The number of rotations is reduced by a correction value from the number. In this case, even if the rotation speed of the indoor fan 7 changes, the dehumidifying ability can be maintained.

ここで、補正制御の他の形態（第２の実施形態）として、圧縮機１の回転数が変化するとき、制御装置１０は、室内ファン７の回転数を変化させない。すなわち、圧縮機１の回転数の変化の前後において、室内ファン７の回転数は同じとなる。圧縮機１の回転数が上がる場合、室内熱交換器６の温度に対する室内ファン７の回転数は相対的に下がる。その後、制御装置１０は、室内熱交換器６の温度の変化に応じて室内ファン７の回転数を変化させる。したがって、一時的に除湿能力が上がる。逆に、圧縮機１の回転数が下がる場合、室温が低く、室内熱交換器６の温度は低い。このとき、除湿能力は高い。室内熱交換器６の温度に対する室内ファン７の回転数は相対的に上がるので、室内熱交換器６の温度が上がり、室内熱交換器６の温度が下がり過ぎて凍結するといったことを未然に防げる。   Here, as another form (second embodiment) of correction control, when the rotational speed of the compressor 1 changes, the control device 10 does not change the rotational speed of the indoor fan 7. That is, the rotational speed of the indoor fan 7 is the same before and after the change in the rotational speed of the compressor 1. When the rotation speed of the compressor 1 increases, the rotation speed of the indoor fan 7 with respect to the temperature of the indoor heat exchanger 6 decreases relatively. Then, the control apparatus 10 changes the rotation speed of the indoor fan 7 according to the change of the temperature of the indoor heat exchanger 6. FIG. Therefore, the dehumidifying capacity is temporarily increased. On the contrary, when the rotation speed of the compressor 1 decreases, the room temperature is low and the temperature of the indoor heat exchanger 6 is low. At this time, the dehumidifying ability is high. Since the rotational speed of the indoor fan 7 with respect to the temperature of the indoor heat exchanger 6 is relatively increased, it is possible to prevent the temperature of the indoor heat exchanger 6 from rising and the temperature of the indoor heat exchanger 6 from being too low to freeze. .

さらに、補正制御の他の形態（第３の実施形態）として、圧縮機１の回転数が変化するとき、制御装置１０は、室内ファン７の回転数の補正値をリセットする。すなわち、圧縮機１の回転数が変化したとき、変化後の回転数に対応する室内ファン７の基準回転数で室内ファン７が駆動される。その後、制御装置１０は、室内熱交換器６の温度の変化に応じて室内ファン７の回転数を変化させる。圧縮機１の回転数が上がる場合、除湿能力は一時的に小さくなるが、室内熱交換器６の凍結を防げる。特に、圧縮機１の回転数が変化するとき、室内熱交換器６の温度が下限温度以下にあると、除湿能力が十分にあるので、補正値を０としてもよく、室内熱交換器６の温度の低下を抑えることができる。   Furthermore, as another form (third embodiment) of correction control, when the rotation speed of the compressor 1 changes, the control device 10 resets the correction value of the rotation speed of the indoor fan 7. That is, when the rotation speed of the compressor 1 changes, the indoor fan 7 is driven at the reference rotation speed of the indoor fan 7 corresponding to the changed rotation speed. Then, the control apparatus 10 changes the rotation speed of the indoor fan 7 according to the change of the temperature of the indoor heat exchanger 6. FIG. When the rotation speed of the compressor 1 increases, the dehumidifying capacity temporarily decreases, but the indoor heat exchanger 6 can be prevented from freezing. In particular, when the rotational speed of the compressor 1 changes, if the temperature of the indoor heat exchanger 6 is below the lower limit temperature, the dehumidifying capacity is sufficient, so the correction value may be set to 0. A decrease in temperature can be suppressed.

上記の補正制御では、室内ファン７の回転数を下げることにより、送風能力の低下を図っている。送風能力の低下の他の形態（第４の実施形態）として、制御装置１０は、室内ファン７を間欠的に駆動する。   In the correction control described above, the blowing capacity is reduced by lowering the rotational speed of the indoor fan 7. As another form (fourth embodiment) of the reduction in the blowing capacity, the control device 10 drives the indoor fan 7 intermittently.

すなわち、制御装置１０は、補正制御を行うとき、室内熱交換器６の温度が目標温度より高いとき、室内ファン７を停止させる。この間に、室内熱交換器６の温度が下がり、除湿が行われる。しかし、送風が行われないので、室温は低下しない。室内熱交換器６の温度が上がり、下限温度以下になると、制御装置１０は、室内ファン７を基準回転数で駆動する。室内熱交換器６の温度が上がり、目標温度より高くなると、制御装置１０は、室内ファン７を停止させる。室内ファン７の駆動、停止を繰り返し行うことにより、室温の低下を抑えながら除湿を行うことができる。しかも、常時室内ファン７を駆動する場合に比べて、省エネを図りながら除湿を行える。   That is, when performing the correction control, the control device 10 stops the indoor fan 7 when the temperature of the indoor heat exchanger 6 is higher than the target temperature. During this time, the temperature of the indoor heat exchanger 6 decreases and dehumidification is performed. However, since ventilation is not performed, room temperature does not fall. When the temperature of the indoor heat exchanger 6 rises and falls below the lower limit temperature, the control device 10 drives the indoor fan 7 at the reference rotational speed. When the temperature of the indoor heat exchanger 6 rises and becomes higher than the target temperature, the control device 10 stops the indoor fan 7. By repeatedly driving and stopping the indoor fan 7, dehumidification can be performed while suppressing a decrease in room temperature. In addition, dehumidification can be performed while saving energy compared to the case where the indoor fan 7 is always driven.

ところで、室内機の吹出口には、送風方向を制御するルーバが設けられている。ルーバとして、上下方向の風向きを変える横ルーバおよび左右方向の風向きを変える縦ルーバがそれぞれ移動可能に設けられ、制御装置１０は、各ルーバを動作させて、送風方向を変化させる。   By the way, the louver which controls a ventilation direction is provided in the blower outlet of the indoor unit. As the louvers, a horizontal louver that changes the wind direction in the vertical direction and a vertical louver that changes the wind direction in the left-right direction are movably provided, and the control device 10 operates each louver to change the blowing direction.

除湿運転時、横ルーバを移動して、水平方向あるいは斜め上方向に風が吹き出すように風向きが設定され、ユーザに直接冷風が当たらないようにされている。しかし、室内ファン７の回転数が低くなってくるため、あるいは間欠的に室内ファン７が駆動されるときの室内ファン７の駆動直後は回転数が低いため、吹出冷気の比重が重くて垂れ下がりやすい。そのため、ユーザの居住位置付近に冷気が達し、寒く感じる場合がある。そこで、冷風の吹き出し方向が斜め上よりもさらに上向きになるように、横ルーバを移動させて、風向きを変える。また、縦ルーバの向きが左右いずれか一方に片寄るようにしてもよい。横ルーバおよび縦ルーバを移動させて、ユーザに風が当たらないようにすることにより、冷風感をなくすことがき、室温を低下させない除湿運転による快適性を高めることができる。このように、風向きをさらに上向きにしたり、左右方向に偏らせると、高湿時には吹き出した冷気により室内機に露が付くおそれがある。自動的に風向きを変化させるのは、湿度が例えば６５％以下などの一定湿度以下にある場合に限定してもよい。   During the dehumidifying operation, the direction of the wind is set so that the horizontal louver is moved and the wind blows in the horizontal direction or obliquely upward, so that the user is not directly exposed to the cold air. However, since the rotational speed of the indoor fan 7 becomes low, or immediately after the indoor fan 7 is driven intermittently, the rotational speed is low, so that the specific gravity of the blown cold air is heavy and tends to hang down. . For this reason, cold air may reach the vicinity of the user's living position and feel cold. Therefore, the wind direction is changed by moving the horizontal louver so that the blowing direction of the cold air is further upward than obliquely upward. Further, the direction of the vertical louver may be shifted to either the left or right. By moving the horizontal louver and the vertical louver so that the wind does not hit the user, the feeling of cold air can be eliminated and the comfort by dehumidifying operation that does not lower the room temperature can be enhanced. As described above, when the wind direction is further upward or biased in the left-right direction, the indoor unit may be dewed by the cold air blown out at high humidity. The direction of the wind may be automatically changed only when the humidity is below a certain humidity such as 65% or less.

以上の通り、本発明の空気調和機は、圧縮機１、室外熱交換器３、絞り装置４、室内熱交換器６から冷凍サイクルが形成され、室内熱交換器６に室内空気を送る室内ファン７と、空調運転に応じて圧縮機１の回転数を制御し、圧縮機１の回転数に応じて室内ファン７を駆動制御する制御装置１０とを備えたものである。室内熱交換器６の温度を検出する温度検出器１４と、室内の湿度を検出する湿度検出器１３とが設けられ、制御装置１０は、除湿運転を行うとき、室内熱交換器６の温度が検出された室内湿度よりも低い湿度の露点温度になるように、室内ファン７の送風能力を低下させる補正制御を行う。   As described above, the air conditioner of the present invention is an indoor fan in which a refrigeration cycle is formed from the compressor 1, the outdoor heat exchanger 3, the expansion device 4, and the indoor heat exchanger 6, and sends indoor air to the indoor heat exchanger 6. 7 and a control device 10 that controls the rotational speed of the compressor 1 according to the air conditioning operation and drives and controls the indoor fan 7 according to the rotational speed of the compressor 1. A temperature detector 14 for detecting the temperature of the indoor heat exchanger 6 and a humidity detector 13 for detecting the humidity of the room are provided. When the controller 10 performs the dehumidifying operation, the temperature of the indoor heat exchanger 6 is Correction control for reducing the blowing capacity of the indoor fan 7 is performed so that the dew point temperature is lower than the detected indoor humidity.

除湿運転を行うとき、室内ファン７の送風能力を低下させることにより、室内熱交換器６での熱交換の効率が低下して、室内熱交換器６の温度が下がりやすくなるとともに、室内に吹き出す冷風の風量も低減できる。これにより、顕熱冷房能力が低くなり、室温の低下を抑制できる。そして、室内熱交換器６の温度を検出された室内湿度の露点温度よりも低い湿度の露点温度にすることができ、潜熱冷房能力は低下せず、現在の室温を維持しながら室内の湿度が目標とする湿度になるように除湿できる。   When performing the dehumidifying operation, by reducing the blowing capacity of the indoor fan 7, the efficiency of heat exchange in the indoor heat exchanger 6 is reduced, the temperature of the indoor heat exchanger 6 is easily lowered, and the air is blown into the room. The amount of cold air can also be reduced. Thereby, sensible heat cooling capability becomes low and the fall of room temperature can be suppressed. Then, the temperature of the indoor heat exchanger 6 can be set to a dew point temperature lower than the detected dew point temperature of the indoor humidity, the latent heat cooling capacity is not lowered, and the indoor humidity is maintained while maintaining the current room temperature. Dehumidification can be achieved to achieve the target humidity.

室内ファン７は圧縮機１の回転数に対応した基準回転数で駆動され、除湿運転時に制御装置１０は、室内ファン７の回転数を基準回転数より低い回転数に設定して、室内熱交換器６の温度に応じて室内ファン７の回転数を変化させる。   The indoor fan 7 is driven at a reference rotational speed corresponding to the rotational speed of the compressor 1, and the control device 10 sets the rotational speed of the indoor fan 7 to a rotational speed lower than the reference rotational speed during the dehumidifying operation, thereby exchanging indoor heat. The rotational speed of the indoor fan 7 is changed according to the temperature of the vessel 6.

室内ファン７の回転数が低くなることにより、室内熱交換器６を通る風量が減るので、送風能力が低下する。そして、室内熱交換器６の温度に応じて室内ファン７の回転数を変化させるとき、室内ファン７の回転数を下げると、室内熱交換器６の温度が下がり、室内ファン７の回転数を上げると、室内熱交換器６の温度が上がる。したがって、室内ファン７の回転数を増減することにより、室内熱交換器６の温度を目標とする湿度の露点温度に維持できる。   When the rotational speed of the indoor fan 7 is reduced, the air volume passing through the indoor heat exchanger 6 is reduced, so that the air blowing capacity is reduced. And when changing the rotation speed of the indoor fan 7 according to the temperature of the indoor heat exchanger 6, if the rotation speed of the indoor fan 7 is lowered | hung, the temperature of the indoor heat exchanger 6 will fall and the rotation speed of the indoor fan 7 will be reduced. If it raises, the temperature of the indoor heat exchanger 6 will rise. Therefore, by increasing or decreasing the rotational speed of the indoor fan 7, the temperature of the indoor heat exchanger 6 can be maintained at the target humidity dew point temperature.

制御装置１０は、圧縮機１の回転数が所定回転数以下のとき、補正制御を行い、圧縮機１の回転数が所定回転数より大のとき、補正制御を行わない。   The control device 10 performs correction control when the rotation speed of the compressor 1 is equal to or less than the predetermined rotation speed, and does not perform correction control when the rotation speed of the compressor 1 is greater than the predetermined rotation speed.

圧縮機１の回転数が所定回転数より大のとき、室内熱交換器６の温度は露点温度より低くなっている可能性がある。室内熱交換器６の温度が露点温度より低いときに、補正制御を行うと、さらに室内熱交換器６の温度が下がり、室内熱交換器６が凍結するおそれがある。そのため、圧縮機１の回転数が所定回転数より大のときには、室内熱交換器６の温度を下げなくても、除湿することができる。圧縮機１が所定回転数以下で駆動されるとき、補正制御を行うことにより、室温を低下させずに室内熱交換器６の温度を露点温度まで下げることができる。   When the rotation speed of the compressor 1 is larger than the predetermined rotation speed, the temperature of the indoor heat exchanger 6 may be lower than the dew point temperature. If correction control is performed when the temperature of the indoor heat exchanger 6 is lower than the dew point temperature, the temperature of the indoor heat exchanger 6 may further decrease and the indoor heat exchanger 6 may freeze. Therefore, when the rotation speed of the compressor 1 is larger than the predetermined rotation speed, dehumidification can be performed without lowering the temperature of the indoor heat exchanger 6. When the compressor 1 is driven at a predetermined speed or less, by performing correction control, the temperature of the indoor heat exchanger 6 can be lowered to the dew point temperature without lowering the room temperature.

制御装置１０は、圧縮機１の回転数の変化に応じて基準回転数を変化させるとき、変化前の室内ファン７の回転数の補正値を維持したまま室内ファン７の回転数を変化させる。   When the control device 10 changes the reference rotation speed in accordance with the change in the rotation speed of the compressor 1, the control apparatus 10 changes the rotation speed of the indoor fan 7 while maintaining the correction value of the rotation speed of the indoor fan 7 before the change.

室温、外気温などによって圧縮機１の回転数は変化し、これに伴って室内ファン７の基準回転数も変化する。例えば室内ファン７の基準回転数が上がるとき、変更後の基準回転数から室内ファン７の回転数を下げるように補正すると、基準回転数の変化後の回転数が変化前の回転数よりも高くなり、室内熱交換器６の温度が露点温度近くになっていても、室内熱交換器６の温度が上がってしまい、除湿能力が低下することがある。このような事態を防ぐために、室内ファン７の基準回転数の変化の前後において、回転数の補正値をそのままにすることにより、変化の前後における室内ファン７の回転数の増減が小さくなり、圧縮機１の回転数が変化しても、除湿能力を維持できる。また、変化後の圧縮機１の回転数に対する応答性を早くすることができ、除湿能力の維持を図れる。   The rotation speed of the compressor 1 changes depending on the room temperature, the outside air temperature, and the like, and the reference rotation speed of the indoor fan 7 changes accordingly. For example, when the reference rotational speed of the indoor fan 7 increases, if the correction is made so that the rotational speed of the indoor fan 7 is lowered from the changed reference rotational speed, the rotational speed after the change of the reference rotational speed is higher than the rotational speed before the change. Thus, even if the temperature of the indoor heat exchanger 6 is close to the dew point temperature, the temperature of the indoor heat exchanger 6 may increase, and the dehumidifying ability may decrease. In order to prevent such a situation, the increase / decrease in the rotational speed of the indoor fan 7 before and after the change is reduced by leaving the correction value of the rotational speed as it is before and after the change in the reference rotational speed of the indoor fan 7, and compression. Even if the rotation speed of the machine 1 changes, the dehumidifying ability can be maintained. Moreover, the responsiveness with respect to the rotation speed of the compressor 1 after a change can be made quick, and a dehumidification capability can be maintained.

前記露点温度より低い下限温度が設定され、制御装置１０は、室内熱交換器６の温度が下限温度より高いとき、補正制御を行い、室内熱交換器６の温度が下限温度以下のとき、補正制御を行わない。   A lower limit temperature lower than the dew point temperature is set, and the control device 10 performs correction control when the temperature of the indoor heat exchanger 6 is higher than the lower limit temperature, and corrects when the temperature of the indoor heat exchanger 6 is equal to or lower than the lower limit temperature. Do not control.

室内熱交換器６の温度が下がり過ぎると、室内熱交換器６が凍結するおそれが生じ、室内熱交換器６が凍結すると除湿能力が下がる。この凍結を防ぐために、室内ファン７の回転数を下げないように制御するための下限温度が設定される。室内熱交換器６の温度が下限温度以下になると、室内ファン７の回転数を上げるように室内ファン７が制御される。これにより、室内熱交換器６の温度が上昇して、凍結を未然に防ぐことができる。   If the temperature of the indoor heat exchanger 6 is too low, the indoor heat exchanger 6 may be frozen, and when the indoor heat exchanger 6 is frozen, the dehumidifying ability is lowered. In order to prevent this freezing, a lower limit temperature is set for controlling so as not to decrease the rotation speed of the indoor fan 7. When the temperature of the indoor heat exchanger 6 falls below the lower limit temperature, the indoor fan 7 is controlled so as to increase the rotational speed of the indoor fan 7. Thereby, the temperature of the indoor heat exchanger 6 rises and freezing can be prevented beforehand.

すなわち、前記露点温度が目標温度とされ、目標温度より低い下限温度が設定され、制御装置１０は、室内熱交換器６の温度が下限温度より低いと、室内ファン７の回転数を上げ、室内熱交換器６の温度が目標温度より高いと、室内ファン７の回転数を下げ、室内熱交換器６の温度が目標温度と下限温度との間にあるとき、室内ファン７の回転数を維持する。   That is, the dew point temperature is set as a target temperature, and a lower limit temperature lower than the target temperature is set. When the temperature of the indoor heat exchanger 6 is lower than the lower limit temperature, the control device 10 increases the rotational speed of the indoor fan 7 When the temperature of the heat exchanger 6 is higher than the target temperature, the rotational speed of the indoor fan 7 is lowered, and when the temperature of the indoor heat exchanger 6 is between the target temperature and the lower limit temperature, the rotational speed of the indoor fan 7 is maintained. To do.

また、下限温度として、凍結防止制御を行うために、上記の下限温度よりも低い運転下限温度が設定される。室内熱交換器６の温度が運転下限温度より低くなると、圧縮機１の回転数が下げられる。これにより、室内熱交換器６の温度の低下が抑えられるが、除湿能力は低下する。そこで、制御装置１０は、室内熱交換器６の温度が下限温度以下のとき、補正制御を行わない。すなわち、室内熱交換器６の温度が前記露点温度より低いとき、制御装置１０は、除湿運転時に補正制御を行わず、基準回転数で室内ファン７を制御する。このように、補正制御を行わないことにより、室内ファン７の回転数は上がるので、室内熱交換器６の温度が上がる。室内熱交換器６の温度が露点温度に近づくと、再び補正制御が行われ、室内ファン７の回転数が下げられ、除湿能力が回復する。   Moreover, in order to perform antifreezing control as the lower limit temperature, an operation lower limit temperature lower than the above lower limit temperature is set. When the temperature of the indoor heat exchanger 6 becomes lower than the operation lower limit temperature, the rotational speed of the compressor 1 is lowered. Thereby, although the fall of the temperature of the indoor heat exchanger 6 is suppressed, dehumidification capability falls. Therefore, the control device 10 does not perform correction control when the temperature of the indoor heat exchanger 6 is equal to or lower than the lower limit temperature. That is, when the temperature of the indoor heat exchanger 6 is lower than the dew point temperature, the control device 10 controls the indoor fan 7 at the reference rotational speed without performing correction control during the dehumidifying operation. As described above, by not performing the correction control, the rotational speed of the indoor fan 7 is increased, so that the temperature of the indoor heat exchanger 6 is increased. When the temperature of the indoor heat exchanger 6 approaches the dew point temperature, correction control is performed again, the rotational speed of the indoor fan 7 is lowered, and the dehumidifying ability is restored.

制御装置１０は、除湿運転の開始時、補正制御を行わず、その後補正制御ありの除湿運転を行う。除湿運転の開始時には、室温が高い場合があり、設定温度まで下げることが望まれる。そのため、補正制御を行わずに除湿運転を行うことにより、送風能力が低下せず、除湿しながら室温を下げることができる。除湿運転の開始から所定時間経過後、あるいは室温が設定温度近くに設定された運転開始温度まで下がると、補正制御が行われる。これにより、すばやく室温を設定温度にでき、さらに設定温度から室温を下げずに除湿できる。   The control device 10 does not perform the correction control at the start of the dehumidifying operation, and thereafter performs the dehumidifying operation with the correction control. At the start of the dehumidifying operation, the room temperature may be high, and it is desirable to lower it to the set temperature. Therefore, by performing the dehumidifying operation without performing the correction control, the air blowing capacity is not lowered, and the room temperature can be lowered while dehumidifying. Correction control is performed after a predetermined time has elapsed from the start of the dehumidifying operation or when the room temperature falls to the operation starting temperature set near the set temperature. Thereby, the room temperature can be quickly set to the set temperature, and further dehumidification can be performed without lowering the room temperature from the set temperature.

制御装置１０は、室内ファン７の回転が不安定になる最低回転数以上で補正制御を行う。室内ファン７の回転数が最低回転数より低くなると、室内ファン７の回転が不安定となる。これを避けるために。室内ファン７の回転数が最低回転数より低くならないように、室内ファン７は制御される。   The control device 10 performs correction control at a minimum rotation speed or more at which the rotation of the indoor fan 7 becomes unstable. When the rotation speed of the indoor fan 7 becomes lower than the minimum rotation speed, the rotation of the indoor fan 7 becomes unstable. To avoid this. The indoor fan 7 is controlled so that the rotational speed of the indoor fan 7 does not become lower than the minimum rotational speed.

除湿運転時の圧縮機１の最小回転数が設定され、制御装置１０は、除湿運転時に圧縮機１の回転数が最小回転数より低くなるときであっても最小回転数で圧縮機１を制御する。圧縮機１の回転数が低くなると、除湿能力も低くなる。そこで、補正制御を行うときの除湿能力を確保するために、室温、外気温などに応じて圧縮機１の回転数が下げられ、最小回転数よりも低くなる場合であっても、圧縮機１の回転数は最小回転数とされる。これにより、除湿能力の低下を防げる。なお、室内ファン７の制御に関しては、最小回転数よりも低くなる変化後の圧縮機１の回転数に対応する基準回転数に基づいて室内ファン７の回転数が決められる。   The minimum rotational speed of the compressor 1 during the dehumidifying operation is set, and the control device 10 controls the compressor 1 at the minimum rotational speed even when the rotational speed of the compressor 1 is lower than the minimum rotational speed during the dehumidifying operation. To do. When the rotation speed of the compressor 1 is lowered, the dehumidifying ability is also lowered. Therefore, in order to ensure the dehumidifying ability when performing the correction control, the compressor 1 is lowered in accordance with the room temperature, the outside air temperature, and the like, and even when the compressor 1 is lower than the minimum revolution, The number of rotations is the minimum number of rotations. Thereby, the fall of a dehumidification capability can be prevented. Regarding the control of the indoor fan 7, the rotational speed of the indoor fan 7 is determined based on the reference rotational speed corresponding to the rotational speed of the compressor 1 after the change that becomes lower than the minimum rotational speed.

制御装置１０は、室内ファン７を間欠的に駆動して、送風能力を低下させる。室内ファン７が間欠的に駆動されることにより、室内熱交換器６に対する送風量は常時駆動される場合に比べて低下する。室内ファン７が低下している間に、室内熱交換器６の温度が低下し、室内熱交換器６の周囲の空気が除湿され、冷やされた風が室内に吹き出さないので、室温が低下しない。室内ファン７が駆動されると、室内の空気が吸い込まれ、室内熱交換器６を通るときに除湿され、乾燥した空気が室内に吹き出される。このとき、室温が下げられ、室温を設定温度に近付けることができる。   The control device 10 drives the indoor fan 7 intermittently to reduce the blowing capacity. When the indoor fan 7 is intermittently driven, the amount of air blown to the indoor heat exchanger 6 is reduced as compared with the case where the indoor fan 7 is always driven. While the indoor fan 7 is decreasing, the temperature of the indoor heat exchanger 6 is decreased, the air around the indoor heat exchanger 6 is dehumidified, and the cooled air is not blown into the room, so the room temperature decreases. do not do. When the indoor fan 7 is driven, indoor air is sucked in, dehumidified when passing through the indoor heat exchanger 6, and dried air is blown out into the room. At this time, the room temperature is lowered, and the room temperature can be brought close to the set temperature.

なお、本発明は、上記実施形態に限定されるものではなく、本発明の範囲内で上記実施形態に多くの修正および変更を加え得ることは勿論である。冷房運転専用の空気調和機や一体型空気調和機において、除湿運転の補正制御を行ってもよい。   In addition, this invention is not limited to the said embodiment, Of course, many corrections and changes can be added to the said embodiment within the scope of the present invention. In the air conditioner dedicated to the cooling operation or the integrated air conditioner, correction control of the dehumidifying operation may be performed.

１ 圧縮機
２ 四方弁
３ 室外熱交換器
４ 絞り装置
５ 室外ファン
６ 室内熱交換器
７ 室内ファン
１０ 制御装置
１１ 外気温検出器
１２ 室温検出器
１３ 湿度検出器
１４ 室内熱交換器温度検出器 DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Outdoor heat exchanger 4 Throttle device 5 Outdoor fan 6 Indoor heat exchanger 7 Indoor fan 10 Control apparatus 11 Outdoor temperature detector 12 Room temperature detector 13 Humidity detector 14 Indoor heat exchanger temperature detector

Claims (5)

圧縮機、室外熱交換器、絞り装置、室内熱交換器から冷凍サイクルが形成され、室内熱交換器に室内空気を送る室内ファンと、空調運転に応じて圧縮機の回転数を制御し、圧縮機の回転数に応じて室内ファンを駆動制御する制御装置とを備え、室内熱交換器の温度を検出する温度検出器と、室内の湿度を検出する湿度検出器とが設けられ、制御装置は、除湿運転時に現在の室内の湿度より一定値低い目標湿度を設定し、目標湿度に基づいて算出された露点温度を目標温度とし、目標湿度よりも低く設定された下限湿度の露点温度を下限温度として、室内熱交換器の温度が目標温度と下限温度との間になるように、室内ファンの送風能力を低下させる補正制御を行い、
制御装置は、まず通常の除湿運転を開始した後、補正制御を開始し、室内熱交換器の温度が目標温度より高い場合、送風能力を低下させ、室内熱交換器の温度が目標温度と下限温度との間にあるとき、送風能力を低下させた状態を維持し、補正制御の開始時に室内熱交換器の温度が目標温度よりも低い場合、補正制御を行わずに通常の除湿運転を行うことを特徴とする空気調和機。 A compressor, outdoor heat exchanger, expansion device, and indoor heat exchanger form a refrigeration cycle, an indoor fan that sends indoor air to the indoor heat exchanger, and the compressor rotation speed is controlled according to the air conditioning operation. A control device that drives and controls the indoor fan according to the number of rotations of the machine, a temperature detector that detects the temperature of the indoor heat exchanger, and a humidity detector that detects the humidity in the room are provided. During dehumidifying operation, set a target humidity that is lower than the current indoor humidity by a certain value, set the dew point temperature calculated based on the target humidity as the target temperature, and set the dew point temperature of the lower limit humidity set lower than the target humidity to the lower limit temperature. As the temperature of the indoor heat exchanger is between the target temperature and the lower limit temperature, correction control is performed to reduce the blowing capacity of the indoor fan,
The control device first starts normal dehumidification operation, then starts correction control, and when the temperature of the indoor heat exchanger is higher than the target temperature, the air blowing capacity is reduced, and the temperature of the indoor heat exchanger becomes lower than the target temperature and the lower limit. When the temperature is between the temperature and the temperature of the indoor heat exchanger is lower than the target temperature at the start of the correction control, the normal dehumidification operation is performed without performing the correction control. An air conditioner characterized by that. 室内ファンは圧縮機の回転数に対応した基準回転数で駆動され、除湿運転時に制御装置は、室内ファンの回転数を基準回転数より低い回転数に設定して、室内熱交換器の温度に応じて一定間隔で室内ファンの回転数を所定回転数ずつ変化させることを特徴とする請求項１記載の空気調和機。 The indoor fan is driven at a reference rotational speed corresponding to the rotational speed of the compressor, and during the dehumidifying operation, the control device sets the rotational speed of the indoor fan to a rotational speed lower than the reference rotational speed and adjusts to the temperature of the indoor heat exchanger. The air conditioner according to claim 1, wherein the rotation speed of the indoor fan is changed by a predetermined rotation speed at regular intervals . 制御装置は、圧縮機の回転数の変化に応じて基準回転数を変化させるとき、変化前の室内ファンの回転数の補正値を維持したまま室内ファンの回転数を変化させ、圧縮機の回転数が所定回転数以下のとき、補正制御を行い、圧縮機の回転数が所定回転数より大のとき、補正制御を行わないことを特徴とする請求項１または２記載の空気調和機。 When the control device changes the reference rotation speed according to the change in the rotation speed of the compressor, the rotation speed of the indoor fan is changed while maintaining the correction value of the rotation speed of the indoor fan before the change, and the rotation of the compressor The air conditioner according to claim 1 or 2 , wherein correction control is performed when the number is equal to or less than a predetermined rotation speed, and correction control is not performed when the rotation speed of the compressor is greater than the predetermined rotation speed . 前記下限温度より低い運転下限温度が設定され、制御装置は、室内熱交換器の温度が運転下限温度より高いとき、補正制御を行い、室内熱交換器の温度が運転下限温度以下のとき、圧縮機の回転数を下げる凍結防止制御を行うことを特徴とする請求項１〜３のいずれかに記載の空気調和機。 The set lower limit temperature lower than the operating limit temperature, the controller, when the temperature of the indoor heat exchanger is higher than the operating limit temperature, performs correction control, when the temperature of the chamber within the heat exchanger is less than the operating minimum temperature, The air conditioner according to any one of claims 1 to 3, wherein anti-freezing control is performed to reduce the rotational speed of the compressor. 送風方向を制御するルーバが設けられ、室内ファンの送風能力が低下したとき、制御装置は、ルーバを動作させて、送風方向を左右いずれか一方に片寄るように変化させることを特徴とする請求項１〜４のいずれかに記載の空気調和機。 The louver is provided for controlling the air blowing direction, and when the air blowing capacity of the indoor fan is reduced, the control device operates the louver to change the air blowing direction to be shifted to either the left or right. The air conditioner in any one of 1-4.
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