JP4587895B2 - Air conditioner - Google Patents

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JP4587895B2
JP4587895B2 JP2005205649A JP2005205649A JP4587895B2 JP 4587895 B2 JP4587895 B2 JP 4587895B2 JP 2005205649 A JP2005205649 A JP 2005205649A JP 2005205649 A JP2005205649 A JP 2005205649A JP 4587895 B2 JP4587895 B2 JP 4587895B2
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refrigerant
temperature
heat exchanger
outdoor
compressor
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JP2007024371A (en
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佳嗣 北村
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Sharp Corp
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本発明は、空気調和機に関するものである。   The present invention relates to an air conditioner.

従来から、冷媒を圧縮する圧縮機と、冷媒によって熱交換を行なう室内熱交換器および室外熱交換器と、圧縮機、室内熱交換器および室外熱交換器のそれぞれに接続され、冷媒が循環する循環路と、室外熱交換器に送風する室外機ファンとを有する空気調和機が用いられている。
特開２００２−３４９９３６号公報 Conventionally, a refrigerant that circulates is connected to a compressor that compresses the refrigerant, an indoor heat exchanger and an outdoor heat exchanger that perform heat exchange using the refrigerant, and a compressor, an indoor heat exchanger, and an outdoor heat exchanger, respectively. An air conditioner having a circulation path and an outdoor unit fan that blows air to an outdoor heat exchanger is used.
JP 2002-349936 A

上記従来の空気調和機においては、室内熱交換器において蒸発する冷媒の温度および圧縮機に吸入される冷媒の温度に基づいて圧縮機が吸入する冷媒の過熱を抑制する手法が採用されている。ただし、この手法においては、圧縮機に吸入される冷媒の温度の変動を正確に測定するために、非常に高精度の温度センサが必要である。   In the conventional air conditioner, a technique is adopted in which overheating of the refrigerant sucked by the compressor is suppressed based on the temperature of the refrigerant evaporated in the indoor heat exchanger and the temperature of the refrigerant sucked into the compressor. However, in this method, in order to accurately measure the temperature variation of the refrigerant sucked into the compressor, a highly accurate temperature sensor is required.

一方、圧縮機が吐出する冷媒の温度は高精度の温度センサでなくても容易に測定され得る。したがって、圧縮機が吐出する冷媒の温度を測定し、その温度から冷媒の過熱度を推定する手法も採用されている。しかしながら、その手法によっては過熱度を十分に正確に推定することができない。そこで、圧縮機が吐出する冷媒と室外熱交換器内の冷媒との温度差を算出し、その温度差と所定の閾値との比較結果に基づいて膨張弁の開度の調整を行なうことによって、圧縮機の吸入冷媒の過熱度を制御する手法が試みられている。   On the other hand, the temperature of the refrigerant discharged from the compressor can be easily measured without using a highly accurate temperature sensor. Therefore, a method of measuring the temperature of the refrigerant discharged from the compressor and estimating the degree of superheat of the refrigerant from the temperature is also employed. However, the degree of superheat cannot be estimated sufficiently accurately by this method. Therefore, by calculating the temperature difference between the refrigerant discharged from the compressor and the refrigerant in the outdoor heat exchanger, and adjusting the opening of the expansion valve based on the comparison result between the temperature difference and a predetermined threshold value, Attempts have been made to control the degree of superheat of the refrigerant sucked in the compressor.

しかしながら、上記の手法のみでは、室内の熱負荷が高い場合または外気の温度が高い場合には、冷媒の過熱を抑制しきれず、空気調和機の冷房能力が不足するという事態が生じてしまう。   However, only with the above-described method, when the indoor heat load is high or the temperature of the outside air is high, overheating of the refrigerant cannot be suppressed, and the air conditioner has insufficient cooling capacity.

本発明は、上述の問題に鑑みなされたものであり、その目的は、室内の熱負荷が大きい場合または外気の温度が高い場合にも十分な冷房能力を発揮することができる空気調和機を提供することである。   The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an air conditioner that can exhibit sufficient cooling capacity even when the indoor heat load is large or the temperature of the outside air is high. It is to be.

本発明の空気調和機は、冷媒を圧縮する圧縮機と、冷媒と空気とが熱交換を行なう室内熱交換器および室外熱交換器とを備えている。また、圧縮機、室内熱交換器および室外熱交換器のそれぞれには、循環路が接続され、冷媒が循環路を循環する。また、空気調和機は、室外熱交換器に送風する室外機ファンと、室外熱交換器の流出口の近傍の冷媒の温度または外気の温度を検出する第１温度センサと、圧縮機の吐出口近傍の冷媒温度を検出する第２温度センサとを備えている。第１温度センサおよび第２温度センサによって得られた温度情報は制御部に入力され、制御部は室外機ファンを制御する。また、制御部は、冷房時には、室外熱交換器または外気と圧縮機の吐出口の近傍の冷媒との温度差が所定値よりも大きくなれば、その温度差に応じて、室外機ファンの回転速度を大きくする冷媒過熱抑制制御を実行する。これによれば、室内の熱負荷が大きい場合または外気の温度が高い場合においても、冷媒が過熱されることを防止することができ、冷房能力の低下を抑制することができる。 The air conditioner of the present invention includes a compressor that compresses a refrigerant, and an indoor heat exchanger and an outdoor heat exchanger that exchange heat between the refrigerant and air. A circulation path is connected to each of the compressor, the indoor heat exchanger, and the outdoor heat exchanger, and the refrigerant circulates in the circulation path. The air conditioner also includes an outdoor unit fan that blows air to the outdoor heat exchanger, a first temperature sensor that detects the temperature of the refrigerant or the temperature of the outside air near the outlet of the outdoor heat exchanger, and the discharge port of the compressor And a second temperature sensor for detecting a refrigerant temperature in the vicinity. The temperature information obtained by the first temperature sensor and the second temperature sensor is input to the control unit, and the control unit controls the outdoor unit fan. In addition, when the temperature difference between the outdoor heat exchanger or the outside air and the refrigerant near the discharge port of the compressor becomes larger than a predetermined value during cooling, the control unit rotates the outdoor unit fan according to the temperature difference. The refrigerant overheat suppression control for increasing the speed is executed. According to this, even when the indoor heat load is large or the temperature of the outside air is high, it is possible to prevent the refrigerant from being overheated and to suppress a decrease in cooling capacity.

また、温度差が前述の所定値より大きい場合にのみ、すなわち、冷媒の過熱を防止する必要がある場合にのみ、前述の冷媒過熱抑制制御が実行されれば、制御部の負担が軽減される。 Moreover, if the above-described refrigerant overheat suppression control is executed only when the temperature difference is larger than the predetermined value, that is, when it is necessary to prevent the refrigerant from overheating, the burden on the control unit is reduced. .

また、循環路には膨張弁が設けられており、制御部が、前述の冷媒過熱抑制制御において、室外機ファンの回転速度を大きくするとともに、前述の温度差に応じて、膨張弁の開度を大きくする制御を実行すれば、室外機ファンだけでなく膨張弁をも用いて冷媒の過熱が抑制されるため、冷媒の過熱防止効果が一層高められる。 Moreover, the circulation passage is provided with an expansion valve, the control unit, the refrigerant superheating suppression control described above, as well as increasing the rotational speed of the outdoor unit fan, depending on the temperature difference between the aforementioned opening of Rise expansion valve If the control to increase the degree is executed , the refrigerant overheating is suppressed by using not only the outdoor unit fan but also the expansion valve, so that the refrigerant overheating prevention effect is further enhanced.

以下、図を参照しながら、本発明の実施の形態の空気調和機を説明する。
実施の形態の空気調和機は、冷媒が循環する循環路２０と、循環路２０に設けられた圧縮機１、室内熱交換器５、室外熱交換器３、および四方切換弁２とを備えている。圧縮機１は、循環路２０の復路から吸入された冷媒を圧縮して循環路２０の往路へ吐出する。室外熱交換器３内においては、循環路２０から流れ込んできた冷媒と外気との間で熱交換が行なわれる。室内熱交換器５においても、循環路２０から流れ込んできた冷媒と室内空気との間で熱交換が行なわれる。四方切換弁２は、冷媒を第１の方向に流す第１の状態（冷房時の状態：図１参照）と、冷媒を第１の方向とは逆向きの第２の方向に流す第２の状態（暖房時の状態：図２参照）とに変化可能である。 Hereinafter, an air conditioner according to an embodiment of the present invention will be described with reference to the drawings.
The air conditioner of the embodiment includes a circulation path 20 through which refrigerant circulates, a compressor 1 provided in the circulation path 20, an indoor heat exchanger 5, an outdoor heat exchanger 3, and a four-way switching valve 2. Yes. The compressor 1 compresses the refrigerant sucked from the return path of the circulation path 20 and discharges it to the forward path of the circulation path 20. In the outdoor heat exchanger 3, heat exchange is performed between the refrigerant flowing from the circulation path 20 and the outside air. In the indoor heat exchanger 5 as well, heat exchange is performed between the refrigerant flowing from the circulation path 20 and the room air. The four-way switching valve 2 includes a first state in which the refrigerant flows in a first direction (state during cooling: see FIG. 1), and a second state in which the refrigerant flows in a second direction opposite to the first direction. It can be changed to a state (a state during heating: see FIG. 2).

室外熱交換器３の近傍には室外機ファン１５が設けられており、室外機ファン１５が生成する風によって室外熱交換器３における冷媒と外気との熱交換が促進される。また、室内熱交換器５には、室内熱交換器５内の冷媒の温度を測定する温度センサ１０が設けられており、温度センサ１０で得られた温度情報は室内機制御部７に送信される。また、室内機制御部７は室内空気の温度を測定する温度センサ１３にも接続されており、温度センサ１３から室内機制御部７へ室内空気の温度情報が送信される。   An outdoor unit fan 15 is provided in the vicinity of the outdoor heat exchanger 3, and heat exchange between the refrigerant and the outdoor air in the outdoor heat exchanger 3 is promoted by the wind generated by the outdoor unit fan 15. The indoor heat exchanger 5 is provided with a temperature sensor 10 that measures the temperature of the refrigerant in the indoor heat exchanger 5, and temperature information obtained by the temperature sensor 10 is transmitted to the indoor unit control unit 7. The The indoor unit control unit 7 is also connected to a temperature sensor 13 that measures the temperature of room air, and the temperature information of the room air is transmitted from the temperature sensor 13 to the indoor unit control unit 7.

また、室内機制御部７は、室外機制御部６に通信可能に接続されており、温度センサ１３および１０から送信されてきた信号を受けて室外機制御部６へ送信する。また、圧縮機１の冷媒の吐出口の近傍には温度センサ８が設けられており、温度センサ８から吐出冷媒の温度情報が室外機制御部６へ送信される。また、外気の温度を測定する温度センサ１４および室外熱交換器３の流出口の近傍の冷媒の温度を測定する温度センサ９のそれぞれから室外機制御部６へ温度情報が送信される。また、室外機制御部６は、前述の各温度センサから温度情報を受けて、その温度情報に基づいて、圧縮機１、四方切換弁２および室外機ファン１５を制御することが可能である。   The indoor unit control unit 7 is communicably connected to the outdoor unit control unit 6, receives signals transmitted from the temperature sensors 13 and 10, and transmits the signals to the outdoor unit control unit 6. Further, a temperature sensor 8 is provided in the vicinity of the refrigerant discharge port of the compressor 1, and temperature information of the discharged refrigerant is transmitted from the temperature sensor 8 to the outdoor unit control unit 6. Further, temperature information is transmitted to the outdoor unit control unit 6 from each of the temperature sensor 14 that measures the temperature of the outside air and the temperature sensor 9 that measures the temperature of the refrigerant in the vicinity of the outlet of the outdoor heat exchanger 3. The outdoor unit control unit 6 can receive temperature information from each of the temperature sensors described above and can control the compressor 1, the four-way switching valve 2, and the outdoor unit fan 15 based on the temperature information.

なお、図１には、冷房時の四方切換弁２の状態が示されており、図２には、暖房時の四方切換弁２の状態が示されている。図１の循環路２０内の冷媒循環方向と図２の循環路２０内の冷媒循環方向とは逆になっている。また、冷房時には、室内熱交換器５は蒸発器として機能し、室外熱交換器３は凝縮器として機能する。一方、暖房時には、室内熱交換器５は凝縮器として機能し、室外熱交換器３は蒸発器として機能する。   FIG. 1 shows the state of the four-way switching valve 2 during cooling, and FIG. 2 shows the state of the four-way switching valve 2 during heating. The refrigerant circulation direction in the circulation path 20 in FIG. 1 is opposite to the refrigerant circulation direction in the circulation path 20 in FIG. During cooling, the indoor heat exchanger 5 functions as an evaporator, and the outdoor heat exchanger 3 functions as a condenser. On the other hand, during heating, the indoor heat exchanger 5 functions as a condenser, and the outdoor heat exchanger 3 functions as an evaporator.

上記のような構成の実施の形態の空気調和機においては、冷房時においては、以下のような処理が行なわれる。   In the air conditioner of the embodiment configured as described above, the following processing is performed during cooling.

図３に示すように、室外機制御処理においては、まず、Ｓ１において、室外機制御部６は、図１に示す温度センサ８から圧縮機１の吐出口の近傍の温度Ｔｄを取得する。次に、Ｓ２において、室外機制御部６は、温度センサ１４および９から外気の温度および室外熱交換器３から流出される冷媒の温度ＴＯＰＬを取得する。次に、Ｓ３において、Ｔｄ−ＴＯＰＬ＞Ｋであるか否かが判別される。Ｓ３において、Ｔｄ−ＴＯＰＬが所定値Ｋ以下であればＳ４の通常処理が行なわれるが、Ｓ３において、Ｔｄ−ＴＯＰＬが所定値Ｋよりも大きければＳ５の過熱抑制制御処理が行われる。   As shown in FIG. 3, in the outdoor unit control process, first, in S1, the outdoor unit control unit 6 acquires a temperature Td in the vicinity of the discharge port of the compressor 1 from the temperature sensor 8 shown in FIG. Next, in S <b> 2, the outdoor unit control unit 6 acquires the temperature of the outside air from the temperature sensors 14 and 9 and the temperature TOPL of the refrigerant flowing out from the outdoor heat exchanger 3. Next, in S3, it is determined whether or not Td−TOPL> K. In S3, if Td-TOPL is equal to or less than a predetermined value K, the normal process of S4 is performed. If Td-TOPL is greater than the predetermined value K in S3, the overheat suppression control process of S5 is performed.

次に、図４および図５を用いて、通常処理および過熱抑制制御処理を具体的に説明する。通常処理においては、図４に示すように、Ｓ７においては、膨張弁４の開度が１に設定され、室外機ファン１５の回転速度が１に設定される。つまり、膨張弁４の開度および室外機ファン１５の回転速度は、最も小さい値に設定される。その後、再度Ｓ１の処理が実行される。   Next, the normal process and the overheat suppression control process will be specifically described with reference to FIGS. 4 and 5. In the normal process, as shown in FIG. 4, the opening degree of the expansion valve 4 is set to 1 and the rotational speed of the outdoor unit fan 15 is set to 1 in S 7. That is, the opening degree of the expansion valve 4 and the rotation speed of the outdoor unit fan 15 are set to the smallest value. Thereafter, the process of S1 is executed again.

一方、図５に示すように、過熱抑制制御処理においては、Ｓ８において、Ｔｄ−ＴＯＰＬ≧Ｌ（＞Ｋ）であるか否かが判別される。Ｔｄ−ＴＯＰＬ≧Ｌでなければ、Ｌ＞Ｔｄ−ＴＯＰＬ＞Ｋであるため、Ｓ９において、膨張弁４の開度が２に設定され、室外機ファン１５の回転速度が２に設定される。つまり、通常処理のときに比較して、膨張弁４の開度が大きくなるとともに、室外機ファン１５の回転速度が大きくなる。   On the other hand, as shown in FIG. 5, in the overheat suppression control process, it is determined in S8 whether Td−TOPL ≧ L (> K). If Td−TOPL ≧ L is not satisfied, then L> Td−TOPL> K. Therefore, in S9, the opening degree of the expansion valve 4 is set to 2, and the rotational speed of the outdoor unit fan 15 is set to 2. That is, the opening degree of the expansion valve 4 is increased and the rotational speed of the outdoor unit fan 15 is increased as compared with the normal processing.

一方、Ｓ８において、Ｔｄ−ＴＯＰＬ≧Ｌであれば、Ｓ１０の処理が実行される。Ｓ１０においては、Ｔｄ−ＴＯＰＬが所定値Ｌ以上でありかつ所定値Ｍより小さいか否かが判別される。Ｓ１０において、Ｔｄ−ＴＯＰＬが所定値Ｌ以上でありかつ所定値Ｍより小さければ、Ｓ１１の処理が実行される。Ｓ１１においては、膨張弁４の開度が３に設定され、室外機ファン１５の回転速度が３に設定される。つまり、Ｓ９における設定に比較して、膨張弁４の開度および室外機ファン１５の回転速度がさらに大きくなる。   On the other hand, if Td−TOPL ≧ L in S8, the process of S10 is executed. In S10, it is determined whether or not Td−TOPL is equal to or larger than a predetermined value L and smaller than a predetermined value M. In S10, if Td-TOPL is equal to or larger than the predetermined value L and smaller than the predetermined value M, the process of S11 is executed. In S11, the opening degree of the expansion valve 4 is set to 3, and the rotational speed of the outdoor unit fan 15 is set to 3. That is, the opening degree of the expansion valve 4 and the rotational speed of the outdoor unit fan 15 are further increased compared to the setting in S9.

一方、Ｓ１０において、Ｔｄ−ＴＯＰＬが所定値Ｌ以上でありかつ所定値Ｍより小さくなければ、Ｔｄ−ＴＯＰＬが所定値Ｍ以上であると判断され、Ｓ１２の処理が実行される。Ｓ１２においては、膨張弁４の開度が４に設定され、室外機ファン１５の回転速度が４に設定される。つまり、膨張弁４の開度および室外機ファン１５の回転速度が最も大きくなる。なお、本明細書においては、Ｋ＜Ｌ＜Ｍの関係が成立しているとともに、膨張弁４の開度および室外機ファン１５の回転速度は、上記において設定されている数字が大きいほど大きいものとする。   On the other hand, in S10, if Td-TOPL is not less than the predetermined value L and not less than the predetermined value M, it is determined that Td-TOPL is not less than the predetermined value M, and the process of S12 is executed. In S12, the opening degree of the expansion valve 4 is set to 4, and the rotational speed of the outdoor unit fan 15 is set to 4. That is, the opening degree of the expansion valve 4 and the rotational speed of the outdoor unit fan 15 are maximized. In the present specification, the relationship of K <L <M is established, and the opening degree of the expansion valve 4 and the rotational speed of the outdoor unit fan 15 are larger as the set number is larger. And

上記の本実施の形態の空気調和機によれば、Ｓ３において、圧縮機１の吐出口の近傍の冷媒と外気または室外熱交換器３の流出口の近傍の冷媒との温度差が所定値Ｋよりも大きくなれば、室外熱交換器３の熱交換効率を向上させるために、すなわち冷房能力を向上させるために、室外機ファン１５の回転速度を増加させる。したがって、室内の熱負荷が大きい場合または外気の温度が高い場合に、冷房能力が不足するといった不都合が生じることが防止されている。また、前述の温度差が所定値Ｋより大きくなった場合のみ、つまり、過熱を防止する必要がある場合にのみ、過熱抑制制御が実行されるため、室外機制御部６の負担が軽減されている。   According to the air conditioner of the present embodiment, in S3, the temperature difference between the refrigerant near the discharge port of the compressor 1 and the refrigerant near the outside air or the outlet of the outdoor heat exchanger 3 is a predetermined value K. In order to improve the heat exchange efficiency of the outdoor heat exchanger 3, that is, to improve the cooling capacity, the rotational speed of the outdoor unit fan 15 is increased. Therefore, inconveniences such as insufficient cooling capacity are prevented when the indoor heat load is large or the temperature of the outside air is high. Further, since the overheat suppression control is executed only when the above-described temperature difference is greater than the predetermined value K, that is, when it is necessary to prevent overheating, the burden on the outdoor unit control unit 6 is reduced. Yes.

また、室外機ファン１５の回転速度の制御は、膨張弁４の開度の制御とともに行なわれるため、相乗効果を得ることができる。さらに、圧縮機１の吐出口の近傍の冷媒の温度と外気の温度または室外熱交換器３の温度との差に応じて、徐々に室外機ファン１５の回転速度および膨張弁４の開度を向上させているため、無駄なエネルギを使うことなく効率的に冷房能力を向上させることができる。   Moreover, since the control of the rotational speed of the outdoor unit fan 15 is performed together with the control of the opening degree of the expansion valve 4, a synergistic effect can be obtained. Further, the rotational speed of the outdoor unit fan 15 and the opening degree of the expansion valve 4 are gradually increased according to the difference between the temperature of the refrigerant near the discharge port of the compressor 1 and the temperature of the outside air or the temperature of the outdoor heat exchanger 3. Therefore, the cooling capacity can be improved efficiently without using wasted energy.

なお、前述の実施の形態では、四方切換弁４を有する空気調和機が例示されているが、四方切換弁を有しない冷房専用の空気調和機であっても、冷房時に前述の制御が実行されれば、本実施の形態の空気調和機と同様の効果を得ることができる。   In the above-described embodiment, the air conditioner having the four-way switching valve 4 is illustrated. However, even in the case of an air conditioner dedicated to cooling that does not have the four-way switching valve, the above-described control is executed during cooling. If it is, the effect similar to the air conditioner of this Embodiment can be acquired.

なお、今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は上記した説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。   The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

実施の形態の空気調和機の冷房時の冷媒経路（矢印）を示す図である。It is a figure which shows the refrigerant | coolant path | route (arrow) at the time of air conditioning of the air conditioner of embodiment. 実施の形態の空気調和機の暖房時の冷媒経路（矢印）を示す図である。It is a figure which shows the refrigerant | coolant path | route (arrow) at the time of the heating of the air conditioner of embodiment. 室外機制御処理を説明するための図である。It is a figure for demonstrating outdoor unit control processing. 通常処理を説明するための図である。It is a figure for demonstrating normal processing. 過熱抑制処理を説明するための図である。It is a figure for demonstrating an overheat suppression process.

符号の説明Explanation of symbols

１ 圧縮機、２ 四方切換弁、３ 室外熱交換器、４ 膨張弁、５ 室内熱交換器、６ 室外機制御部、７ 室内機制御部、８，９，１０，１３，１４ 温度センサ、１５ 室外機ファン。   DESCRIPTION OF SYMBOLS 1 Compressor, 2 way switching valve, 3 Outdoor heat exchanger, 4 Expansion valve, 5 Indoor heat exchanger, 6 Outdoor unit control part, 7 Indoor unit control part, 8, 9, 10, 13, 14 Temperature sensor, 15 Outdoor unit fan.

Claims (3)

冷媒を圧縮する圧縮機と、
前記冷媒と空気とが熱交換を行なう室内熱交換器および室外熱交換器と、
前記圧縮機、前記室内熱交換器および前記室外熱交換器のそれぞれに接続され、前記冷媒が循環する循環路と、
前記室外熱交換器に送風する室外機ファンと、
前記室外熱交換器の流出口の近傍の冷媒の温度または外気の温度を検出する第１温度センサと、
前記圧縮機の吐出口の近傍の冷媒の温度を検出する第２温度センサと、
前記第１温度センサおよび前記第２温度センサによって得られた温度情報が入力され、前記室外機ファンを制御する制御部とを備え、
前記制御部は、冷房時には、前記室外熱交換器の流出口の近傍の冷媒または前記外気と前記圧縮機の吐出口の近傍の冷媒との温度差が所定値よりも大きくなれば、前記温度差に応じて、前記室外機ファンの回転速度を大きくする冷媒過熱抑制制御を実行する、空気調和機。 A compressor for compressing the refrigerant;
An indoor heat exchanger and an outdoor heat exchanger in which the refrigerant and air exchange heat; and
A circulation path that is connected to each of the compressor, the indoor heat exchanger, and the outdoor heat exchanger, and in which the refrigerant circulates;
An outdoor unit fan for blowing air to the outdoor heat exchanger;
A first temperature sensor for detecting the temperature of the refrigerant or the temperature of the outside air in the vicinity of the outlet of the outdoor heat exchanger;
A second temperature sensor for detecting the temperature of the refrigerant in the vicinity of the discharge port of the compressor;
A temperature control unit that receives temperature information obtained by the first temperature sensor and the second temperature sensor and controls the outdoor unit fan;
The control unit, when cooling, if the temperature difference between the refrigerant near the outlet of the outdoor heat exchanger or the outside air and the refrigerant near the discharge port of the compressor is greater than a predetermined value, the temperature difference and, performing a pre-Symbol refrigerant superheat suppression control to increase the rotational speed of the outdoor unit fan according to the air conditioner. 前記制御部は、前記温度差が前記所定値より大きい場合にのみ、前記冷媒過熱抑制制御を実行する、請求項１に記載の空気調和機。 Wherein the control unit, the temperature difference is only larger than the predetermined value, performing the refrigerant overheat suppression control, the air conditioner according to claim 1. 前記循環路には膨張弁が設けられており、
前記制御部が、前記冷媒過熱抑制制御において、前記室外機ファンの回転速度を大きくするとともに、前記温度差に応じて、前記膨張弁の開度を大きくする制御を実行する、請求項１に記載の空気調和機。 The circulation path is provided with an expansion valve,
Wherein the control unit is, in the refrigerant overheat suppression control, thereby increasing the rotational speed of the outdoor unit fan, depending on the temperature difference, to perform the opening and to increase control of the pre-Symbol expansion valve, to claim 1 The air conditioner described.
JP2005205649A 2005-07-14 2005-07-14 Air conditioner Expired - Fee Related JP4587895B2 (en)

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JPH03213957A (en) * 1990-01-18 1991-09-19 Mitsubishi Electric Corp Air conditioner
JPH07286761A (en) * 1994-04-18 1995-10-31 Hitachi Ltd Air conditioner
JPH102625A (en) * 1996-06-14 1998-01-06 Mitsubishi Heavy Ind Ltd Refrigerator
JPH11316057A (en) * 1998-05-06 1999-11-16 Mitsubishi Electric Corp Refrigerating/air conditioning apparatus
JP2002130770A (en) * 2000-10-30 2002-05-09 Mitsubishi Electric Corp Refrigerating cycle device and its control method
JP2004054424A (en) * 2002-07-17 2004-02-19 Fuji Electric Retail Systems Co Ltd Refrigerant cooling circuit and vending machine using it

Patent Citations (6)

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Publication number Priority date Publication date Assignee Title
JPH03213957A (en) * 1990-01-18 1991-09-19 Mitsubishi Electric Corp Air conditioner
JPH07286761A (en) * 1994-04-18 1995-10-31 Hitachi Ltd Air conditioner
JPH102625A (en) * 1996-06-14 1998-01-06 Mitsubishi Heavy Ind Ltd Refrigerator
JPH11316057A (en) * 1998-05-06 1999-11-16 Mitsubishi Electric Corp Refrigerating/air conditioning apparatus
JP2002130770A (en) * 2000-10-30 2002-05-09 Mitsubishi Electric Corp Refrigerating cycle device and its control method
JP2004054424A (en) * 2002-07-17 2004-02-19 Fuji Electric Retail Systems Co Ltd Refrigerant cooling circuit and vending machine using it

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