JP2000055485A - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JP2000055485A JP2000055485A JP10223846A JP22384698A JP2000055485A JP 2000055485 A JP2000055485 A JP 2000055485A JP 10223846 A JP10223846 A JP 10223846A JP 22384698 A JP22384698 A JP 22384698A JP 2000055485 A JP2000055485 A JP 2000055485A
- Authority
- JP
- Japan
- Prior art keywords
- compressor
- discharge pressure
- control
- air conditioner
- lowering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
-
- 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
Landscapes
- Air Conditioning Control Device (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、空気調和機におい
て圧縮機の吐出圧力制御に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to discharge pressure control of a compressor in an air conditioner.
【０００２】[0002]
【従来の技術】空気調和機に使用している圧縮機には許
容吐出圧力が決められている。能力可変のインバーター
方式の空気調和機に使用する場合は、一般的にその駆動
周波数に対してそれぞれの許容圧力が決められている。2. Description of the Related Art An allowable discharge pressure is determined for a compressor used in an air conditioner. When used in an inverter-type air conditioner of variable capacity, respective allowable pressures are generally determined for the drive frequency.
【０００３】圧縮機の吐出圧力は気液２相状態の冷媒が
通過する凝縮器の温度を測定することにより、換算して
推定できる。このため、許容吐出圧力を越え圧縮機を破
壊することのないよう、凝縮器の温度にて空気調和機は
圧縮機の回転数等運転を制御している。[0003] The discharge pressure of the compressor can be converted and estimated by measuring the temperature of the condenser through which the refrigerant in the gas-liquid two-phase state passes. For this reason, the air conditioner controls the operation such as the rotation speed of the compressor at the temperature of the condenser so as not to exceed the allowable discharge pressure and break the compressor.
【０００４】ヒートポンプ方式の空気調和機において
は、冷房時は室外側の熱交換器が、暖房時は室内側の熱
交換器がそれぞれ凝縮器となる。一般に空気調和機の室
外側の熱交換器との熱交換のために設けられている室外
ファンの回転数等の運転制御は種々の運転条件により、
空気調和機自身で制御している場合が多く、空気調和機
のユーザーが特に直接制御することはない。In a heat pump type air conditioner, a heat exchanger on the outdoor side is used as a condenser during cooling, and a heat exchanger on the indoor side is used as a condenser during heating. Generally, the operation control such as the rotation speed of an outdoor fan provided for heat exchange with an outdoor heat exchanger of an air conditioner is performed according to various operation conditions.
In many cases, the air conditioner controls the air conditioner itself, and the user of the air conditioner does not directly control the air conditioner.
【０００５】[0005]
【発明が解決しようとする課題】しかし、空気調和機の
室内側の熱交換器との熱交換のために設けられている室
内ファンの回転数の制御は空気調和機のユーザーが直接
指示できる。つまり、室内ファンの風速は強弱微等と自
由にユーザーが設定できる。However, the user of the air conditioner can directly control the rotation speed of the indoor fan provided for heat exchange with the heat exchanger on the indoor side of the air conditioner. In other words, the wind speed of the indoor fan can be freely set by the user, such as high or low.
【０００６】室外ファンの回転数はユーザーが直接指示
することは無く、冷房運転の場合ユーザーが指示した室
内ファンの風速、冷房の設定温度等の運転条件により、
間接的に決まってくる。また、凝縮器である室外熱交換
器用の室外ファンの回転数を高い回転数から低い回転数
へと落とす必要が生じた場合でも、少しづつ落としてい
き、急激に室外ファンの回転数を落とさないように制御
できる。[0006] The number of rotations of the outdoor fan is not directly specified by the user, and in the case of cooling operation, it depends on the operating conditions such as the wind speed of the indoor fan and the set temperature of the cooling specified by the user.
It is decided indirectly. Also, even when it is necessary to reduce the rotation speed of the outdoor fan for the outdoor heat exchanger, which is a condenser, from a high rotation speed to a low rotation speed, the rotation speed is gradually reduced, and the rotation speed of the outdoor fan is not rapidly reduced. Can be controlled as follows.
【０００７】しかし、暖房運転の場合は室内ファンの回
転数を直接ユーザーが設定するため、例えば「強」の回
転数から「微」の回転数に落とされることがある。つま
り、急に凝縮器の凝縮性能が小さくなるために、圧縮機
の吐出圧力が上昇し、許容圧力を越える場合がでてく
る。However, in the case of the heating operation, the number of revolutions of the indoor fan is directly set by the user, and therefore, for example, the number of revolutions may be reduced from "strong" to "fine". That is, since the condensation performance of the condenser suddenly decreases, the discharge pressure of the compressor increases and sometimes exceeds the allowable pressure.
【０００８】もっともユーザーの設定があっても、空気
調和機にとって、無理がかかるような場合は、緩やかに
室内ファンの回転数を変えていくなど、ユーザーの設定
には応えるけれども、機械に無理がかからないように制
御していく方法も考えられる。ただし、この場合はユー
ザーに自分の要求通りに機械がすぐに応えないとして、
不満を持たれる虞れがある。[0008] Even if there is a user's setting, if the air conditioner is too difficult, it will respond to the user's setting, for example, by gradually changing the number of revolutions of the indoor fan. It is also conceivable to carry out control so that it does not occur. However, in this case, the machine will not immediately respond to the user as requested,
There is a risk of dissatisfaction.
【０００９】上記のように暖房運転において、ユーザー
に室内ファンの回転数を急激に低下された場合、室内フ
ァンの回転数を低下させた時点での吐出圧力はその許容
限界値までにまだ余裕があり、空気調和機は圧縮機の吐
出圧力が制御開始値を越えたとの認識がないため、特に
圧縮機の吐出圧力を下げる制御を行わない。As described above, in the heating operation, when the rotational speed of the indoor fan is rapidly decreased by the user, the discharge pressure at the time when the rotational speed of the indoor fan is decreased still has a margin to its allowable limit value. Since the air conditioner does not recognize that the discharge pressure of the compressor has exceeded the control start value, the air conditioner does not particularly perform control to lower the discharge pressure of the compressor.
【００１０】やがて室内熱交換器での凝縮性能が急に小
さくなるため、圧縮機の吐出圧力が急上昇し、制御開始
値を越える。それから圧縮機の吐出圧力を下げる制御を
行うため、空気調和機は圧縮機の駆動周波数を下げて運
転するが、圧縮機の吐出圧力を下げるまでには時間がか
かり、その間にオーバーシュートしてしまうことがあ
り、圧縮機の吐出圧力許容上限値を越えて長時間使用し
た場合、圧縮機の軸受、電動機巻線等に損傷を与える虞
れがある。Eventually, the condensing performance in the indoor heat exchanger suddenly decreases, so that the discharge pressure of the compressor sharply increases and exceeds the control start value. Then, in order to perform control to lower the discharge pressure of the compressor, the air conditioner operates by lowering the drive frequency of the compressor, but it takes time to lower the discharge pressure of the compressor, and overshoot occurs during that time. In some cases, when the compressor is used for a long time exceeding the allowable upper limit of the discharge pressure of the compressor, the bearings of the compressor, the windings of the motor, and the like may be damaged.
【００１１】本発明は上記課題を解決することを目的と
するものである。An object of the present invention is to solve the above problems.
【００１２】[0012]
【課題を解決するための手段】本発明の空気調和機は上
記課題を解決するために、室内熱交換器が凝縮器として
作用する暖房運転時において、室内ファンの回転数を所
定値以下に下げる制御がなされたときに、圧縮機の吐出
圧力を下げる制御運転に入るか否かの判断基準となる圧
縮機の吐出圧力制御開始値を所定時間、所定値下げて、
運転を制御するもの、圧縮機の吐出圧力を下げる制御運
転を所定時間行うもの、圧縮機の吐出圧力が制御判定値
以上であれば、前記圧縮機の吐出圧力を下げる制御運転
を所定時間行うもの、室温が所定値以上であれば、前記
圧縮機の吐出圧力を下げる制御運転を所定時間行うもの
である。In order to solve the above problems, the air conditioner of the present invention reduces the number of revolutions of the indoor fan to a predetermined value or less during a heating operation in which the indoor heat exchanger acts as a condenser. When the control is performed, the discharge pressure control start value of the compressor, which is a criterion for determining whether to enter a control operation for reducing the discharge pressure of the compressor, for a predetermined time, is lowered by a predetermined value,
Controlling the operation, performing a control operation for reducing the discharge pressure of the compressor for a predetermined time, performing control operation for reducing the discharge pressure of the compressor for a predetermined time if the discharge pressure of the compressor is equal to or greater than a control determination value. If the room temperature is equal to or higher than a predetermined value, a control operation for lowering the discharge pressure of the compressor is performed for a predetermined time.
【００１３】また、上記における圧縮機の吐出圧力を下
げる制御運転は、圧縮機の駆動周波数を所定時間、該運
転時の駆動周波数より所定値下げて運転すると共に、該
所定時間中は前記圧縮機に対する駆動周波数増加制御を
受け付けないものである。In the control operation for decreasing the discharge pressure of the compressor, the compressor is operated with the drive frequency of the compressor lowered for a predetermined time from the drive frequency at the time of the operation, and the compressor is operated during the predetermined time. The drive frequency increase control is not accepted.
【００１４】また、上記における圧縮機の吐出圧力を下
げる制御運転は、蒸発器となる室外熱交換器と熱交換さ
せるための室外ファンの回転を所定時間停止すると共
に、該所定停止時間中は前記室外ファンに対する運転制
御を受け付けないものである。In the control operation for reducing the discharge pressure of the compressor, the rotation of an outdoor fan for exchanging heat with an outdoor heat exchanger serving as an evaporator is stopped for a predetermined time, and the rotation of the outdoor fan is stopped during the predetermined stop time. The operation control for the outdoor fan is not accepted.
【００１５】また、上記における圧縮機の吐出圧力制御
開始値及び吐出圧力を、気液２相状態の冷媒が通過する
室内熱交換器における凝縮温度と比較する基準温度及び
その凝縮温度でそれぞれ代用するものである。[0015] The discharge pressure control start value and the discharge pressure of the compressor described above are substituted by a reference temperature for comparing the condensing temperature in the indoor heat exchanger through which the refrigerant in the gas-liquid two-phase state passes, and the condensing temperature thereof. Things.
【００１６】本発明の空気調和機によれば、暖房運転時
に室内ファンの回転数を所定値以下に下げる制御がなさ
れたときに、圧縮機の吐出圧力制御開始値を所定時間、
所定値下げて、運転を制御するものであるから、圧縮機
が通常時の吐出圧力制御開始値に到達する前に、吐出圧
力制御開始値に到達したと空気調和機が認識して、圧縮
機の吐出圧力を下げる制御を行うため、圧縮機が真の吐
出圧力許容上限値を越えることはなく、圧縮機を破壊す
ることはない。室内ファンの回転数低下後所定時間経過
すると、吐出圧力制御の制御開始値を通常時のレベルに
戻しても吐出圧力がオーバーシュートすることはない。According to the air conditioner of the present invention, when the rotation speed of the indoor fan is controlled to be equal to or lower than the predetermined value during the heating operation, the discharge pressure control start value of the compressor is set to a predetermined time,
Since the operation is controlled by lowering the predetermined value, the air conditioner recognizes that the discharge pressure control start value has been reached before the compressor reaches the normal discharge pressure control start value. Since the control for reducing the discharge pressure is performed, the compressor does not exceed the true upper limit of the discharge pressure, and the compressor is not broken. When a predetermined time has elapsed after the rotation speed of the indoor fan has decreased, the discharge pressure does not overshoot even if the control start value of the discharge pressure control is returned to the normal level.
【００１７】また、暖房運転時に室内ファンの回転数を
所定値以下に下げる制御がなされたときには、圧縮機の
吐出圧力が上昇し吐出圧力許容上限値を越える虞れがあ
ると見做して、圧縮機の吐出圧力を下げる制御運転を所
定時間行うため、圧縮機が真の吐出圧力許容上限値を越
えることはない。Further, when control is performed to reduce the number of revolutions of the indoor fan to a predetermined value or less during the heating operation, it is considered that the discharge pressure of the compressor may increase and exceed the discharge pressure allowable upper limit. Since the control operation for lowering the discharge pressure of the compressor is performed for a predetermined time, the compressor does not exceed the true upper limit of the discharge pressure.
【００１８】また、圧縮機の吐出圧力が制御判定値以上
であれば、圧縮機の吐出圧力が上昇し吐出圧力許容上限
値を越える虞れが大であるので、圧縮機の吐出圧力を下
げる制御運転を所定時間行うものである。If the discharge pressure of the compressor is equal to or higher than the control determination value, the discharge pressure of the compressor is likely to increase and exceed the allowable upper limit of the discharge pressure. The operation is performed for a predetermined time.
【００１９】また、室温が所定値以上であれば、圧縮機
の吐出圧力が上昇し吐出圧力許容上限値を越える虞れが
大であるので、圧縮機の吐出圧力を下げる制御運転を所
定時間行うものである。If the room temperature is equal to or higher than a predetermined value, the discharge pressure of the compressor is likely to increase and exceed the allowable upper limit of the discharge pressure. Therefore, a control operation for lowering the discharge pressure of the compressor is performed for a predetermined time. Things.
【００２０】また、圧縮機の吐出圧力を下げる制御運転
は、圧縮機の駆動周波数を下げることによって達成され
る。その駆動周波数を下げると、仕事量が減るためであ
る。また、圧縮機の吐出圧力を下げる制御運転は、室外
熱交換器（蒸発器）と熱交換させるための室外ファンの
回転を停止することによっても達成され得る。蒸発量が
減り圧縮機の仕事量が多く要求されないためである。Further, the control operation for lowering the discharge pressure of the compressor is achieved by lowering the drive frequency of the compressor. This is because when the driving frequency is reduced, the amount of work is reduced. The control operation for reducing the discharge pressure of the compressor can also be achieved by stopping the rotation of an outdoor fan for exchanging heat with an outdoor heat exchanger (evaporator). This is because the amount of evaporation is reduced and a large amount of work of the compressor is not required.
【００２１】また、気液２相状態の冷媒が通過する暖房
時の室内熱交換器すなわち凝縮器における凝縮温度から
圧縮機の吐出圧力が分かるため、圧縮機の吐出圧力制御
開始値もこの室内熱交換器における凝縮温度と比較する
基準温度で代用でき、この基準温度を所定値下げて、空
気調和機の運転を制御すれば圧縮機が吐出圧力許容上限
値を越えることがなくなる。Further, since the discharge pressure of the compressor can be determined from the condensation temperature in the indoor heat exchanger, that is, the condenser during heating through which the refrigerant in the gas-liquid two-phase state passes, the discharge pressure control start value of the compressor is also determined by this indoor heat exchanger. The reference temperature compared with the condensing temperature in the exchanger can be substituted. If the reference temperature is reduced by a predetermined value and the operation of the air conditioner is controlled, the compressor will not exceed the allowable upper limit of the discharge pressure.
【００２２】[0022]
【発明の実施の形態】本発明に係る圧縮機の吐出圧力制
御機能を備えた空気調和機の第１の実施形態について、
以下に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of an air conditioner having a compressor discharge pressure control function according to the present invention will be described.
This will be described below.
【００２３】図１は本発明の第１の実施形態に係る圧縮
機の回転数に対する凝縮温度を示すグラフであり、それ
ぞれ太実線１が許容上限値、１点鎖線２が圧縮機の駆動
周波数を「１ランク」下げる凝縮温度、破線３が圧縮機
の駆動周波数を「２ランク」下げる凝縮温度を示す線で
ある。なお、２点鎖線４は後述する第３の実施形態にお
いて、室内ファンの回転数が９００ｒｐｍを越える値よ
り６００ｒｐｍ以下に変化したときに、即座に吐出圧力
制御運転に入るかどうかを判定するための凝縮温度の制
御判定値ラインである。FIG. 1 is a graph showing the condensing temperature with respect to the number of revolutions of the compressor according to the first embodiment of the present invention. A thick solid line 1 indicates an allowable upper limit value, and a dashed line 2 indicates a driving frequency of the compressor. The dashed line 3 is a line showing the condensing temperature lowering the driving frequency of the compressor by "2 ranks", and the condensing temperature lowering by "one rank". The two-dot chain line 4 is used to determine whether or not to start the discharge pressure control operation immediately when the rotation speed of the indoor fan changes from a value exceeding 900 rpm to 600 rpm or less in a third embodiment described later. It is a control determination value line of a condensation temperature.
【００２４】図２に圧縮機の回転数に対する吐出圧力の
許容上限値の例を示している。数値を具体的に記載して
いないのは、機種によっても、またその使用条件によっ
ても異なってくるからであるが、一般的にこのようなグ
ラフになる。なお、圧縮機の回転数は通常１０００〜７
０００ｒｐｍ程度で使用される。FIG. 2 shows an example of the allowable upper limit value of the discharge pressure with respect to the rotation speed of the compressor. The reason why the numerical values are not specifically described is that they differ depending on the model and the use conditions, but generally such a graph is shown. The number of rotations of the compressor is usually 1000 to 7
It is used at about 000 rpm.
【００２５】気液２相状態の冷媒の凝縮温度を測定する
と圧縮機の吐出圧力が分かるため、吐出圧力の代わり
に、凝縮温度を測定し、圧縮機がその吐出許容圧力上限
値を越えることのないように空気調和機の運転を制御で
きる。そこで図２の圧縮機の回転数に対する吐出圧力の
許容上限値を、凝縮温度に焼き直したのが図１である。Since the discharge pressure of the compressor can be determined by measuring the condensing temperature of the refrigerant in the gas-liquid two-phase state, the condensing temperature is measured instead of the discharging pressure. The operation of the air conditioner can be controlled so as not to occur. Thus, FIG. 1 shows that the allowable upper limit value of the discharge pressure with respect to the rotation speed of the compressor in FIG.
【００２６】なお、凝縮温度は気液２相状態の冷媒が通
過する凝縮器（暖房時であれば室内熱交換器、冷房時で
あれば室外熱交換器）の温度を測定し、熱交換器の温度
と内部の冷媒温度との差温（数℃）を加算補正して求め
る。The condensing temperature is measured by measuring the temperature of a condenser (an indoor heat exchanger for heating or an outdoor heat exchanger for cooling) through which a refrigerant in a gas-liquid two-phase state passes. And a difference temperature (several degrees Celsius) between the temperature and the internal refrigerant temperature.
【００２７】図１において、空気調和機は運転中、凝縮
温度を監視しており、その温度が１点鎖線２以上で破線
３未満の温度になると、圧縮機の駆動周波数を「１分
間」「１ランク」下げる。破線３以上の温度になると、
圧縮機の駆動周波数を「１分間」「２ランク」下げる。
１点鎖線２未満の温度であれば、特に圧縮機の駆動周波
数を変える指示はしない。In FIG. 1, during operation, the air conditioner monitors the condensing temperature. When the condensing temperature is higher than the dashed line 2 and lower than the broken line 3, the driving frequency of the compressor is changed to "1 minute". One rank lower. When the temperature reaches 3 or more,
The compressor driving frequency is lowered by "one minute" and "two ranks".
If the temperature is lower than the one-dot chain line 2, there is no instruction to change the driving frequency of the compressor.
【００２８】１度、１点鎖線２や破線３の温度以上にな
り、圧縮機の駆動周波数を下げる制御がなされたとき
は、その「１分間」凝縮温度により圧縮機の駆動周波数
を下げる制御をマスキングし、「１分間」経過後また凝
縮温度により、図１のグラフに従って圧縮機の周波数を
制御する。すなわち凝縮温度が破線３以上であれば、圧
縮機の駆動周波数を「１分間」「２ランク」下げるし、
１点鎖線２以上で破線３未満の温度であれば、圧縮機の
駆動周波数を「１分間」「１ランク」下げる、という具
合に繰り返していく。Once the temperature exceeds the temperature indicated by the one-dot chain line 2 or the broken line 3, the control for lowering the drive frequency of the compressor is performed. After masking and after "one minute", the frequency of the compressor is controlled according to the condensation temperature according to the condensation temperature. That is, if the condensation temperature is equal to or higher than the broken line 3, the drive frequency of the compressor is reduced by "one minute" and "two ranks",
If the temperature is equal to or more than the dashed-dotted line 2 and less than the dashed line 3, the driving frequency of the compressor is reduced by "one minute" and "one rank", and so on.
【００２９】このように圧縮機の駆動周波数を所定時間
下げることによって、凝縮温度すなわち圧縮機の吐出圧
力が許容上限値（図２）を越えることのないように空気
調和機の運転を制御する。As described above, by lowering the driving frequency of the compressor for a predetermined time, the operation of the air conditioner is controlled so that the condensation temperature, that is, the discharge pressure of the compressor does not exceed the allowable upper limit (FIG. 2).
【００３０】圧縮機の駆動周波数のランクは細かい制御
をする部分、大まかな制御をする部分によってその「ラ
ンク」の幅は異なるが、概略「１ランク」は周波数４〜
８Ｈｚの幅であり、周波数が１Ｈｚ異なれば６０ｒｐｍ
程の回転数変動となるから、圧縮機の駆動周波数を「１
ランク」下げると、概略２４０〜４８０ｒｐｍ程回転数
が下がることになる。The rank of the driving frequency of the compressor varies depending on the part that performs fine control and the part that performs rough control, and the width of the "rank" is different.
8 Hz width, 60 rpm if the frequency differs by 1 Hz
Since the rotation speed fluctuates approximately, the drive frequency of the compressor is set to “1”.
When the rank is lowered, the rotation speed is reduced by approximately 240 to 480 rpm.
【００３１】なお、上記によると圧縮機の駆動周波数を
下げるのみであるが、室内温度に対する設定温度などの
運転条件で圧縮機の駆動周波数は決まってくる。ただ
し、上記のマスキングしている「１分間」は圧縮機の駆
動周波数を上げる要求があっても、拒絶し周波数を上げ
ることはしない。According to the above description, only the drive frequency of the compressor is lowered, but the drive frequency of the compressor is determined by operating conditions such as the set temperature with respect to the room temperature. However, even if there is a request to increase the driving frequency of the compressor during the above-mentioned "one minute" of masking, it is not rejected and the frequency is not increased.
【００３２】実際には室内温度と設定温度との差が大き
い運転条件下では圧縮機の駆動周波数は高くなるように
制御されているのが普通であり、吐出圧力のために強制
的に駆動周波数を低下させているのであるから、凝縮温
度が図１における１点鎖線２未満になって、吐出圧力の
ために駆動周波数を低下させる必要がなくなると、運転
条件の要求により、圧縮機の駆動周波数は上げられる。
するとまた、吐出圧力のために駆動周波数を下げる制御
に罹るという繰り返しを、室内温度と設定温度との差が
小さくなるまで続くことになる。In practice, under operating conditions where the difference between the room temperature and the set temperature is large, the driving frequency of the compressor is usually controlled to be high. When the condensing temperature becomes lower than the one-dot chain line 2 in FIG. 1 and the driving frequency does not need to be lowered due to the discharge pressure, the driving frequency of the compressor is reduced due to the demand of the operating conditions. Can be raised.
Then, the control of lowering the driving frequency due to the discharge pressure is repeated until the difference between the room temperature and the set temperature becomes smaller.
【００３３】上記が能力可変型圧縮機（インバーター方
式）における通常の吐出圧力制御運転であるが、暖房運
転時、凝縮器となる室内熱交換器用の室内ファンの回転
数を急に低下させた場合の吐出圧力制御運転について次
に記載する。The above is the ordinary discharge pressure control operation in the variable capacity compressor (inverter type). When the rotation speed of the indoor fan for the indoor heat exchanger serving as a condenser is suddenly reduced during the heating operation. The discharge pressure control operation of (1) will be described below.
【００３４】室内ファンの回転数は通常リモコン等でユ
ーザーが指示することによって選択できる。例えば
「強」１５００ｒｐｍ、「弱」１０００ｒｐｍ、「微」
５００ｒｐｍ等である。一方空気調和機自身、室内ファ
ンを何ランクかの回転数に分けて制御しており、室内フ
ァンがどのランクの回転数で運転指示しているかを空気
調和機は監視している。The number of revolutions of the indoor fan can usually be selected by a user's instruction using a remote controller or the like. For example, "strong" 1500 rpm, "weak" 1000 rpm, "fine"
For example, 500 rpm. On the other hand, the air conditioner itself controls the indoor fan by dividing it into several ranks of rotation speed, and the air conditioner monitors which rank of rotation speed the indoor fan is instructing to operate.
【００３５】ユーザーが「強」から「微」や、「弱」か
ら「微」に室内ファンの回転数を低下させる指示をした
とき、風速自動運転時において室内温度が設定温度に近
づいたとき、室内熱交換器の温度が低下したため空気調
和機自身が強制的に室内ファンの回転数を低下させると
き等に、室内ファン回転数が低下する。When the user gives an instruction to decrease the rotation speed of the indoor fan from "strong" to "fine" or from "weak" to "fine", when the indoor temperature approaches the set temperature during the automatic wind speed operation, When the temperature of the indoor heat exchanger is reduced, when the air conditioner itself forcibly reduces the rotation speed of the indoor fan, the rotation speed of the indoor fan decreases.
【００３６】室内ファンの回転数が９００ｒｐｍを越え
る値より６００ｒｐｍ以下に変化するように制御された
時点から「２分間」、図１の１点鎖線２、破線３のライ
ンをすべて「３℃」下げて、上記の吐出圧力制御運転を
行う。つまり室内ファン回転数が９００ｒｐｍを越える
値より６００ｒｐｍ以下に変化したときは吐出圧力制御
運転に罹り易くなる。From the time when the rotation speed of the indoor fan is controlled to change from a value exceeding 900 rpm to 600 rpm or less, "2 minutes", all the lines indicated by the dashed line 2 and the broken line 3 in FIG. Then, the above-described discharge pressure control operation is performed. That is, when the indoor fan rotation speed changes from a value exceeding 900 rpm to 600 rpm or less, the discharge pressure control operation is easily affected.
【００３７】圧縮機の吐出圧力制御開始点となる凝縮温
度（図１の１点鎖線２、破線３）に通常時よりも「３
℃」も早く到達し、圧縮機の駆動周波数を下げるため
に、圧縮機が真の吐出圧力許容上限値（凝縮温度で換算
すると図１の太実線１で示す許容上限値）を越えること
がなく、圧縮機を破壊することがない。The condensation temperature (the dashed line 2 and the broken line 3 in FIG. 1), which is the starting point of the discharge pressure control of the compressor, is set to "3"
° C ”also reaches quickly and the compressor does not exceed the true allowable upper limit of discharge pressure (allowable upper limit indicated by thick solid line 1 in FIG. 1 in terms of condensing temperature) in order to reduce the drive frequency of the compressor. Without destroying the compressor.
【００３８】なお、この「２分間」計時中は室内ファン
回転数の監視をマスキングしているから、この間に例え
ばユーザーによって室内ファンの回転数が変速されて
も、空気調和機はあくまで室内ファン回転数が６００ｒ
ｐｍ以下の低速で運転継続しているものと見做して、実
際には高い回転数に戻して運転されていても無視して図
１の１点鎖線２、破線３のラインを「２分間」すべて
「３℃」下げて吐出圧力制御運転を行う。Since the monitoring of the number of revolutions of the indoor fan is masked during the "two-minute" time measurement, even if the number of revolutions of the indoor fan is changed by the user during this time, the air conditioner is kept rotating. Number is 600r
It is assumed that the operation is continued at a low speed of not more than pm, and even if the operation is actually returned to a high rotation speed, it is ignored, and the lines indicated by the one-dot chain line 2 and the broken line 3 in FIG. Perform the discharge pressure control operation with the temperature lowered by 3 ° C.
【００３９】室内ファンの回転数を急に低下させ室内熱
交換器での凝縮性能が小さくなるために、圧縮機の吐出
圧力が急上昇しても、制御開始値（凝縮温度）を「３
℃」下げて吐出圧力制御を行うので、早めに吐出圧力制
御が罹り、吐出圧力許容上限値を越えることはない。室
内ファンの回転数を低下させた後「２分間」も経過する
と、吐出圧力制御の制御開始値を通常時のレベルに戻し
ても吐出圧力がオーバーシュートすることはない。Since the number of revolutions of the indoor fan suddenly decreases and the condensation performance in the indoor heat exchanger decreases, even if the discharge pressure of the compressor suddenly increases, the control start value (condensation temperature) is set to "3".
Since the discharge pressure control is performed by lowering the temperature by ".degree. C.", the discharge pressure control is affected earlier and does not exceed the allowable upper limit value of the discharge pressure. If "two minutes" elapse after the rotation speed of the indoor fan is reduced, the discharge pressure does not overshoot even if the control start value of the discharge pressure control is returned to the normal level.
【００４０】上記は能力可変型圧縮機（インバーター方
式）における吐出圧力制御運転であるが、能力一定型圧
縮機（ノーマルタイプ）においては、室外熱交換器（蒸
発器）と熱交換させるための室外ファンの運転を停止す
ることによって圧縮機の吐出圧力を下げる制御運転を行
う。蒸発量が減り圧縮機の仕事量が多く要求されないた
め、圧縮機の吐出圧力が下がるからである。The above is the discharge pressure control operation in the variable capacity compressor (inverter system). In the constant capacity compressor (normal type), the outdoor pressure for exchanging heat with the outdoor heat exchanger (evaporator) is used. A control operation for reducing the discharge pressure of the compressor is performed by stopping the operation of the fan. This is because the amount of evaporation is reduced and the work of the compressor is not required to be large, so that the discharge pressure of the compressor decreases.
【００４１】もちろん、室外ファンの運転を停止するこ
となく、単に回転数を下げてもよいが、その効果が小さ
くなること、最近ではインバーター方式が大半を占め、
販売価格を低減することに重きをおいた能力一定型の機
種では、室外ファンの回転数制御は行わず、単にＯＮ／
ＯＦＦ制御している現状だからである。また、圧縮機の
運転を停止することでも吐出圧力を下げることも当然で
きる。Of course, without stopping the operation of the outdoor fan, the number of revolutions may be simply reduced, but the effect is reduced, and in recent years, the inverter type has been dominant.
In models of constant capacity type that focus on reducing the selling price, the outdoor fan speed control is not performed, but simply ON / OFF.
This is because the current state is the OFF control. Also, it is naturally possible to lower the discharge pressure by stopping the operation of the compressor.
【００４２】上記説明は圧縮機の吐出圧力の代わりに気
液２相状態での凝縮温度を測定し、圧縮機がその吐出許
容圧力上限値を越えることのないように空気調和機の運
転を制御する場合で説明したが、圧縮機の吐出圧力を測
定して監視し、吐出圧力制御開始点となる吐出圧力基準
値に所定値を減じて吐出圧力制御を早めに行うことで、
圧縮機が真の吐出許容圧力を越えるのを防止できるのは
言うまでもない。In the above description, the condensing temperature in the gas-liquid two-phase state is measured instead of the discharge pressure of the compressor, and the operation of the air conditioner is controlled so that the compressor does not exceed the upper limit of the discharge allowable pressure. Although described in the case where the discharge pressure of the compressor is measured and monitored, the discharge pressure control is performed earlier by reducing the predetermined value to a discharge pressure reference value serving as a discharge pressure control start point,
It goes without saying that the compressor can be prevented from exceeding the true discharge allowable pressure.
【００４３】次に第２の実施形態について説明する。こ
れは上記の第１の実施形態のように、圧縮機の吐出圧力
制御開始点となる凝縮温度のラインを「２分間」すべて
「３℃」下げて吐出圧力制御を行う程、精密な制御をす
ることなく、大雑把な制御で済まそうとするもので、室
内ファンの回転数を９００ｒｐｍを越える値より６００
ｒｐｍ以下に変化させたときに、圧縮機の吐出圧力が上
昇すると推定して、圧縮機の駆動周波数を例えば「５０
０ｒｐｍ下げて２分間運転」するものである。この「５
００ｒｐｍ下げて２分間運転」は前もって、いろんな状
況を想定して実験を行い、これだけ圧縮機の駆動周波数
を下げて２分間運転すれば、間違っても圧縮機の吐出圧
力許容上限値をこえることはないと確信できる回転数低
減値及び運転時間を選ぶべきものである。この「５００
ｒｐｍ下げて２分間運転」後は室内ファンの回転数を急
に低下させたための圧縮機の吐出圧力急上昇の心配はな
くなり、吐出圧力がオーバーシュートすることはない。Next, a second embodiment will be described. This is because, as in the first embodiment, the more precise the control of the discharge pressure by lowering the condensation temperature line, which is the starting point of the discharge pressure control of the compressor, by "3 ° C." Without the need to perform rough control, the number of rotations of the indoor fan should be set to 600 from a value exceeding 900 rpm.
It is estimated that the discharge pressure of the compressor will increase when it is changed to less than or equal to rpm, and the drive frequency of the compressor is set to, for example, “50”.
It is operated for 2 minutes at 0 rpm. This "5
"Running for 2 minutes at a reduction of 00 rpm" is performed in advance by conducting experiments under various conditions, and if the driving frequency of the compressor is lowered for 2 minutes, the allowable upper limit of the discharge pressure of the compressor will not be exceeded even if it is erroneous. It is necessary to select a rotation speed reduction value and an operation time that can be convinced that there is no such value. This "500
After the "rpm operation for 2 minutes", there is no fear of a sudden increase in the discharge pressure of the compressor due to a sudden decrease in the rotation speed of the indoor fan, and the discharge pressure does not overshoot.
【００４４】次に第３の実施形態について説明する。こ
れも上記の第２の実施形態と同様、大雑把な制御で済ま
そうとするもので、室内ファンの回転数を９００ｒｐｍ
を越える値より６００ｒｐｍ以下に変化させたときに、
圧縮機の吐出圧力の代わりに、気液２相状態の冷媒が通
過する室内熱交換器温度を測定してその凝縮温度を知
り、この値が制御判定値以上であれば、圧縮機の駆動周
波数を上記の第２の実施形態同様「５００ｒｐｍ下げて
２分間運転」するものである。凝縮温度の制御判定値ラ
インを図１の２点鎖線４で示している。このラインは第
１の実施形態の１点鎖線２（周波数を「１ランク」下げ
る制御開始値）を３℃下げた値である。Next, a third embodiment will be described. In this case, as in the second embodiment, rough control is required, and the number of revolutions of the indoor fan is set to 900 rpm.
When the value is changed to 600 rpm or less from the value exceeding
Instead of the discharge pressure of the compressor, the temperature of the indoor heat exchanger through which the refrigerant in the gas-liquid two-phase state passes is measured to determine the condensing temperature. Is operated for 2 minutes at a reduced speed of 500 rpm as in the second embodiment. The control determination value line of the condensation temperature is indicated by a two-dot chain line 4 in FIG. This line is a value obtained by lowering the one-dot chain line 2 (control start value for lowering the frequency by “one rank”) of the first embodiment by 3 ° C.
【００４５】第１の実施形態が吐出圧力制御開始点とな
る凝縮温度のラインを所定時間、所定値下げて、圧縮機
の駆動周波数を「１分間」「１ランク」や「２ランク」
下げるのを繰り返す等の吐出圧力制御運転であるのに、
この第３実施形態では凝縮温度が制御判定値以上であれ
ば、即座に圧縮機の吐出圧力制御運転、それも圧縮機の
駆動周波数を単に「所定回転数下げて所定時間運転」す
るものである。このため第１実施形態よりも圧縮機の駆
動周波数をより多くの回転数を素早く下げ、その時間も
長くしている。つまり「５００ｒｐｍ下げて２分間運
転」は間違っても圧縮機の吐出圧力許容上限値を越える
ことはないと確信できる回転数低減値及び運転時間を選
ぶべきものである。In the first embodiment, the condensing temperature line serving as the discharge pressure control starting point is lowered by a predetermined value for a predetermined time, and the driving frequency of the compressor is set to "1 minute", "1 rank" or "2 ranks".
Although it is a discharge pressure control operation such as repeating lowering,
In the third embodiment, if the condensing temperature is equal to or higher than the control judgment value, the discharge pressure control operation of the compressor is immediately performed, in which the drive frequency of the compressor is simply reduced for a predetermined number of revolutions and operated for a predetermined time. . For this reason, the drive frequency of the compressor is reduced more rapidly and the time is made longer than in the first embodiment. In other words, "run for 2 minutes at 500 rpm" should select a rotation speed reduction value and an operation time which are convinced that the discharge pressure of the compressor will not exceed the allowable upper limit even if it is wrong.
【００４６】次に第４の実施形態について説明する。こ
れも大雑把な制御であるが、室内ファンの回転数を９０
０ｒｐｍを越える値より６００ｒｐｍ以下に変化させた
ときに、室内温度を測定し、この室温が例えば「２５℃
以上」であれば、圧縮機の吐出圧力が上昇すると推定し
て、圧縮機の駆動周波数を上記の同様「５００ｒｐｍ下
げて２分間運転」するものである。Next, a fourth embodiment will be described. This is also a rough control, but the number of rotations of the indoor fan is set to 90.
When the room temperature was changed from a value exceeding 0 rpm to 600 rpm or less, the room temperature was measured.
If "above", it is assumed that the discharge pressure of the compressor will increase, and the drive frequency of the compressor will be "reduced by 500 rpm for 2 minutes" as described above.
【００４７】なお、上記第２乃至第４の実施形態はイン
バーター方式の場合の吐出圧力制御運転であるが、能力
一定型の場合は「室外ファンを例えば２分間停止」する
などで圧縮機の吐出圧力を下げる制御運転を行う。In the above-described second to fourth embodiments, the discharge pressure control operation is performed in the case of the inverter type. In the case of the constant capacity type, the discharge of the compressor is stopped by stopping the outdoor fan for, for example, 2 minutes. Perform control operation to reduce pressure.
【００４８】なお本発明は上記実施の形態に限定される
ものではない。The present invention is not limited to the above embodiment.
【００４９】[0049]
【発明の効果】本発明の空気調和機によれば、暖房運転
時に室内ファンの回転数を所定値以下に下げる制御がな
されたときに、圧縮機の吐出圧力制御開始値を所定時
間、所定値下げて、運転を制御するものであるから、圧
縮機が通常時の吐出圧力制御開始値に到達する前に、吐
出圧力制御開始値に到達したと空気調和機が認識して、
圧縮機の吐出圧力を下げる制御を行うため、圧縮機が真
の吐出圧力許容上限値を越えることはなく、圧縮機を破
壊することはない。According to the air conditioner of the present invention, when the number of revolutions of the indoor fan is controlled to a predetermined value or less during the heating operation, the discharge pressure control start value of the compressor is reduced by a predetermined value for a predetermined time. Therefore, since the operation is controlled, the air conditioner recognizes that the compressor has reached the discharge pressure control start value before the compressor reaches the normal discharge pressure control start value,
Since the control for reducing the discharge pressure of the compressor is performed, the compressor does not exceed the true upper limit of the discharge pressure, and the compressor is not broken.
【００５０】また、暖房運転時に室内ファンの回転数を
所定値以下に下げる制御がなされたとき、さらに圧縮機
の吐出圧力が制御判定値以上であれば、あるいは室温が
所定値以上であれば、圧縮機の吐出圧力が上昇し吐出圧
力許容上限値を越える虞れがあると見做して、圧縮機の
吐出圧力を下げる制御を所定時間行うため、圧縮機が真
の吐出圧力許容上限値を越えることはない。When control is performed to reduce the number of revolutions of the indoor fan to a predetermined value or less during the heating operation, if the discharge pressure of the compressor is equal to or greater than the control determination value or if the room temperature is equal to or greater than the predetermined value, Assuming that there is a possibility that the discharge pressure of the compressor will rise and exceed the discharge pressure allowable upper limit value, the compressor will perform control for lowering the discharge pressure of the compressor for a predetermined time. Never exceed.
【００５１】また、圧縮機の吐出圧力を下げる制御運転
は、圧縮機の駆動周波数を下げること、室外熱交換器
（蒸発器）と熱交換させるための室外ファンの回転を停
止することによって達成される。The control operation for lowering the discharge pressure of the compressor is achieved by lowering the drive frequency of the compressor and stopping the rotation of the outdoor fan for exchanging heat with the outdoor heat exchanger (evaporator). You.
【００５２】また、気液２相状態の冷媒の凝縮温度から
圧縮機の吐出圧力が分かるため、圧縮機の吐出圧力制御
開始値もこの室内熱交換器における凝縮温度と比較する
基準温度で代用でき、この基準温度を所定値下げて、空
気調和機の運転を制御すれば圧縮機が吐出圧力許容上限
値を越えることがなくなる。Further, since the discharge pressure of the compressor can be determined from the condensation temperature of the refrigerant in the gas-liquid two-phase state, the start value of the discharge pressure control of the compressor can be substituted by the reference temperature compared with the condensation temperature in the indoor heat exchanger. If the operation of the air conditioner is controlled by lowering the reference temperature by a predetermined value, the compressor will not exceed the discharge pressure allowable upper limit.
【図１】本発明の第１及び第３の実施形態に係る圧縮機
の回転数に対する凝縮温度（許容上限値、制御開始値、
制御判定値）のグラフである。FIG. 1 is a diagram illustrating a condensing temperature (an allowable upper limit value, a control start value, and a control value) with respect to a rotation speed of a compressor according to first and third embodiments of the present invention.
6 is a graph of a control determination value.
【図２】圧縮機の回転数に対する吐出圧力の許容上限値
のグラフである。FIG. 2 is a graph of an allowable upper limit value of a discharge pressure with respect to a rotation speed of a compressor.
１ 太実線（許容上限値） ２ １点鎖線（周波数を「１ランク」下げる制御開始
値） ３ 破線（周波数を「２ランク」下げる制御開始値） ４ ２点鎖線（吐出圧力制御運転を行うか否かの制御
判定値）1 Thick solid line (allowable upper limit) 2 1-dot chain line (control start value for lowering frequency by "1 rank") 3 Dashed line (control start value for lowering frequency by "2 rank") 4 2-dot chain line (whether to perform discharge pressure control operation) Control judgment value of whether or not)
───────────────────────────────────────────────────── フロントページの続き (72)発明者 六角 雄一 大阪府大阪市阿倍野区長池町22番22号 シ ャープ株式会社内 (72)発明者 池田 裕邦 大阪府大阪市阿倍野区長池町22番22号 シ ャープ株式会社内 Ｆターム(参考） 3L060 AA01 AA08 CC02 CC04 CC08 CC16 DD01 DD02 EE04 EE06 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Yuichi Hekaku 22-22, Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Inside (72) Inventor Hirokuni Ikeda 22-22, Nagaike-cho, Abeno-ku, Osaka-shi, Osaka F term in reference (reference) 3L060 AA01 AA08 CC02 CC04 CC08 CC16 DD01 DD02 EE04 EE06
Claims (7)
房運転時において、室内ファンの回転数を所定値以下に
下げる制御がなされたときに、圧縮機の吐出圧力を下げ
る制御運転に入るか否かの判断基準となる圧縮機の吐出
圧力制御開始値を所定時間、所定値下げて、運転を制御
することを特徴とする空気調和機。In a heating operation in which an indoor heat exchanger acts as a condenser, when a control to reduce the rotation speed of an indoor fan to a predetermined value or less is performed, a control operation to reduce a discharge pressure of a compressor is performed. An air conditioner characterized in that the operation is controlled by lowering a discharge pressure control start value of a compressor, which is a criterion for determining whether or not the operation is started, for a predetermined time period.
房運転時において、室内ファンの回転数を所定値以下に
下げる制御がなされたときに、前記圧縮機の吐出圧力を
下げる制御運転を所定時間行うことを特徴とする空気調
和機。In a heating operation in which the indoor heat exchanger acts as a condenser, a control operation for lowering the discharge pressure of the compressor is performed when a control to reduce the rotation speed of the indoor fan to a predetermined value or less is performed. An air conditioner characterized by performing for a time.
房運転時において、室内ファンの回転数を所定値以下に
下げる制御がなされたときに、前記圧縮機の吐出圧力が
制御判定値以上であれば、前記圧縮機の吐出圧力を下げ
る制御運転を所定時間行うことを特徴とする空気調和
機。3. During a heating operation in which the indoor heat exchanger acts as a condenser, when control is performed to reduce the number of revolutions of the indoor fan to a predetermined value or less, the discharge pressure of the compressor becomes greater than or equal to a control determination value. An air conditioner characterized by performing a control operation for lowering the discharge pressure of the compressor for a predetermined time, if any.
房運転時において、室内ファンの回転数を所定値以下に
下げる制御がなされたときに、室温が所定値以上であれ
ば、前記圧縮機の吐出圧力を下げる制御運転を所定時間
行うことを特徴とする空気調和機。4. When the room temperature is equal to or higher than a predetermined value during a heating operation in which the indoor heat exchanger acts as a condenser and the control is performed to reduce the rotation speed of the indoor fan to a predetermined value or lower, the compressor may be used. An air conditioner characterized in that a control operation for lowering the discharge pressure of the air conditioner is performed for a predetermined time.
が前記制御開始値になったときに行う圧縮機の吐出圧力
を下げる制御運転、又は請求項２乃至請求項４のいずれ
か１つにおいて行う圧縮機の吐出圧力を下げる制御運転
が、前記圧縮機の駆動周波数を所定時間、該運転時の駆
動周波数より所定値下げて運転すると共に、該所定時間
中は前記圧縮機に対する駆動周波数増加制御を受け付け
ないものである請求項１乃至請求項４のいずれか１つに
記載の空気調和機。5. The control operation for decreasing the discharge pressure of the compressor, which is performed when the discharge pressure of the compressor reaches the control start value according to claim 1, or in any one of claims 2 to 4, The control operation for lowering the discharge pressure of the compressor to be performed is such that the drive frequency of the compressor is driven for a predetermined time, the drive frequency is lowered by a predetermined value from the drive frequency during the operation, and the drive frequency increase control for the compressor is performed during the predetermined time. The air conditioner according to any one of claims 1 to 4, wherein the air conditioner is not accepted.
が前記制御開始値になったときに行う圧縮機の吐出圧力
を下げる制御運転、又は請求項２乃至請求項４のいずれ
か１つにおいて行う圧縮機の吐出圧力を下げる制御運転
が、蒸発器となる室外熱交換器と熱交換させるための室
外ファンの回転を所定時間停止すると共に、該所定停止
時間中は前記室外ファンに対する運転制御を受け付けな
いものである請求項１乃至請求項４のいずれか１つに記
載の空気調和機。6. A control operation for lowering the discharge pressure of the compressor, which is performed when the discharge pressure of the compressor reaches the control start value according to claim 1, or in any one of claims 2 to 4, The control operation for lowering the discharge pressure of the compressor to be performed stops the rotation of the outdoor fan for exchanging heat with the outdoor heat exchanger serving as the evaporator for a predetermined time, and controls the operation of the outdoor fan during the predetermined stop time. The air conditioner according to any one of claims 1 to 4, wherein the air conditioner is not accepted.
における前記圧縮機の吐出圧力制御開始値及び請求項
３、請求項５、請求項６の何れかにおける吐出圧力を、
気液２相状態の冷媒が通過する室内熱交換器における凝
縮温度と比較する基準温度及び該凝縮温度でそれぞれ代
用することを特徴とする請求項１、請求項３、請求項
５、請求項６のいずれか１つに記載の空気調和機。7. The discharge pressure control start value of the compressor according to any one of claims 1, 5 and 6, and the discharge pressure according to any one of claims 3, 5 and 6,
The reference temperature and the condensation temperature, which are compared with the condensation temperature in the indoor heat exchanger through which the refrigerant in the gas-liquid two-phase state passes, are substituted for the condensation temperature and the condensation temperature, respectively. The air conditioner according to any one of the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22384698A JP3597053B2 (en) | 1998-08-07 | 1998-08-07 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22384698A JP3597053B2 (en) | 1998-08-07 | 1998-08-07 | Air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000055485A true JP2000055485A (en) | 2000-02-25 |
| JP3597053B2 JP3597053B2 (en) | 2004-12-02 |
Family
ID=16804647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22384698A Expired - Fee Related JP3597053B2 (en) | 1998-08-07 | 1998-08-07 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3597053B2 (en) |
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