JP2005055053A

JP2005055053A - Air conditioner

Info

Publication number: JP2005055053A
Application number: JP2003285645A
Authority: JP
Inventors: Takayuki Izeki; 貴之井関
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2003-08-04
Filing date: 2003-08-04
Publication date: 2005-03-03

Abstract

<P>PROBLEM TO BE SOLVED: To keep a temperature of a heat exchanger within a range of certain specific temperatures, to prevent the breakage of a compressor caused by the rise of suction pressure of the compressor, and to effectively control the frosting on an apparatus without impairing amenity. <P>SOLUTION: When a temperature of an indoor heat exchanger 13 of an air conditioner is lowered, the operation is performed in a state that an operation frequency of a compressor 2 is lowered to increase the temperature to be higher than a temperature of an indoor heat exchanger temperature setting storing device 1. When a value of a suction pressure detecting device 10 of the compressor 2 is higher than a value of a suction pressure setting storing device 29, a motor-driven expansion valve 9 mounted in a suction pipe 8 is controlled in the closing direction to be over a valve opening degree of the motor-driven expansion valve 9. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、圧縮機をインバータにより可変制御する空気調和システムに関する。 The present invention relates to an air conditioning system in which a compressor is variably controlled by an inverter.

従来の空気調和機では、容量（周波数）可変形圧縮機を用い、図１０に示すように室内機の熱交換器温度が露付き制御設定値Ｔxに達すると容量（周波数）を制御し、室内機の吹き出し口等の露付きを回避するものが提案されている（例えば、特許文献１参照）。
特開平４−１０６３５７号公報 In a conventional air conditioner, a capacity (frequency) variable type compressor is used, and when the temperature of the heat exchanger of the indoor unit reaches the dew control value Tx as shown in FIG. There has been proposed one that avoids dew condensation such as the air outlet of the machine (see, for example, Patent Document 1).
JP-A-4-106357

しかしながら、従来の空気調和装置では、圧縮機のオイル供給は圧縮機回転数に依存し、容量（周波数）を下げすぎた場合圧縮機メカ部へのオイル供給能力が低下し、圧縮機の信頼性が著しく低下するため、容量（周波数）の低下には下限があった。また、容量（周波数）の低下により圧縮機の吸入圧力が上昇し、軸受け過重が増加しスラスト軸受けの損傷がおき圧縮機の信頼性が著しく低下するため、圧縮機容量（周波数）低下で熱交換器の温度上昇による露付き回避制御やサーモオフ寸前の低能力運転（低周波数運転）には限界があった。 However, in the conventional air conditioner, the oil supply of the compressor depends on the rotation speed of the compressor, and if the capacity (frequency) is reduced too much, the oil supply capacity to the compressor mechanical part is lowered, and the reliability of the compressor Has a lower limit, so there was a lower limit to the decrease in capacity (frequency). In addition, the suction pressure of the compressor increases due to a decrease in capacity (frequency), bearing overload increases, thrust bearings are damaged, and the reliability of the compressor is significantly reduced, so heat exchange occurs when the compressor capacity (frequency) decreases. There was a limit to dew evasion control due to temperature rise of the vessel and low capacity operation (low frequency operation) just before the thermo-off.

本発明は上記従来の欠点を解消するもので、圧縮機などの機器を保護しながら快適性を損なわず効果的に機器を制御するものである。 The present invention eliminates the above-mentioned conventional drawbacks, and effectively controls equipment without impairing comfort while protecting equipment such as a compressor.

上記課題を解決するために本発明は、室内機熱交換器温度と圧縮機吸入圧力検知装置の信号により圧縮機吸入管に設けた冷媒流量調整装置を制御するものである。 In order to solve the above-described problems, the present invention controls a refrigerant flow rate adjusting device provided in a compressor suction pipe based on an indoor unit heat exchanger temperature and a signal from a compressor suction pressure detection device.

この構成をなすことにより、室内熱交換器をある一定の温度範囲に保ち、圧縮機などの機器を保護し、かつ快適性を損なわず効果的に機器を制御することが可能となる。 With this configuration, the indoor heat exchanger can be maintained in a certain temperature range, equipment such as a compressor can be protected, and equipment can be effectively controlled without impairing comfort.

以上のように、本発明のこうせいによれば、露付き制御時やサーモオフ寸前の低能力運転時の圧縮機低周波運転時でも吸入圧力を低い状態で運転でき（室内熱交換器温度は高い状態）、圧縮機などの機器を保護しながらかつ快適性を損なわず効果的に空気調和装置の運転が可能となる。 As described above, according to this embodiment of the present invention, it is possible to operate at a low suction pressure even during low-frequency operation of the compressor at the time of dew control or low-performance operation just before the thermo-off (the indoor heat exchanger temperature is high). ), It is possible to operate the air conditioner effectively while protecting the equipment such as the compressor and without impairing the comfort.

また、空気調和装置の室内機の吹き出し口周りの露付きを回避できると同時に圧縮機の最低運転周波数を高く設定でき、圧縮機の信頼性がさらに向上する。よって、圧縮機などの機器を保護しながらかつ快適性を損なわず効果的に空気調和装置の運転が可能となる。 Further, the dew around the outlet of the indoor unit of the air conditioner can be avoided, and at the same time, the minimum operating frequency of the compressor can be set high, and the reliability of the compressor is further improved. Therefore, it is possible to operate the air conditioner effectively while protecting equipment such as the compressor and without impairing comfort.

さらに、電磁弁を使用することによりコストダウンが図られる Furthermore, the cost can be reduced by using a solenoid valve.

以下、本発明の実施の形態について、図面を参照しながら説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（実施の形態１）
図１は、本発明の実施の形態1における空気調和機の冷凍サイクル図の一例であり、図２は制御ブロック図、図３はフローチャート図である。 (Embodiment 1)
1 is an example of a refrigeration cycle diagram of an air conditioner according to Embodiment 1 of the present invention, FIG. 2 is a control block diagram, and FIG. 3 is a flowchart.

図１において、室外機１にはインバータ駆動の容量（周波数）可変形圧縮機２（以下単に圧縮機と称す）と、室外熱交換器３と、室外送風機４、冷媒液管５と、冷媒ガス管６と、冷暖房切換用の四方弁７と圧縮機２の冷媒吸入管８にモータ等により弁開度をパルス制御可能な電動冷媒膨張弁９と圧縮機２の吸入圧力を検知する吸入圧力検知装置１０が設けられている。 In FIG. 1, an outdoor unit 1 includes an inverter-driven capacity (frequency) variable compressor 2 (hereinafter simply referred to as a compressor), an outdoor heat exchanger 3, an outdoor blower 4, a refrigerant liquid pipe 5, and a refrigerant gas. Intake pressure detection for detecting the suction pressure of the compressor 6 and the electric refrigerant expansion valve 9 capable of pulse-controlling the valve opening by a motor or the like to the pipe 6, the four-way valve 7 for switching between heating and cooling, and the refrigerant suction pipe 8 of the compressor 2 A device 10 is provided.

又、室外機１には室外の温度を検出する室外吸込み温度検知装置１１が設けられている。 The outdoor unit 1 is provided with an outdoor suction temperature detection device 11 for detecting the outdoor temperature.

一方、室内機１２には室内熱交換器１３と、室内送風機１４と、室外機とつながる冷媒液管５と室内熱交換器１３の間にモータ等により弁開度（以下、パルスと称す）を制御可能な冷媒流量調整装置の電動冷媒膨張弁１５と、室内熱交換器１３に熱交換器の温度を検出する室内熱交換器温度検知装置１６が設けられている。 On the other hand, the indoor unit 12 has a valve opening (hereinafter referred to as a pulse) by a motor or the like between the indoor heat exchanger 13, the indoor fan 14, the refrigerant liquid pipe 5 connected to the outdoor unit, and the indoor heat exchanger 13. An electric refrigerant expansion valve 15 of the controllable refrigerant flow control device and an indoor heat exchanger temperature detection device 16 for detecting the temperature of the heat exchanger are provided in the indoor heat exchanger 13.

また、室内機１２には部屋の室温を検出する室内吸込み温度検知装置１７と、居住者が希望する運転モード（冷房または暖房）と室温と運転あるいは停止を設定できる運転設定装置１８が設けられている。 Further, the indoor unit 12 is provided with an indoor suction temperature detecting device 17 for detecting the room temperature of the room, and an operation setting device 18 for setting the operation mode (cooling or heating) desired by the resident and the room temperature and operation or stop. Yes.

上記構成の冷凍サイクルにおいて、冷房あるいは除湿運転時、圧縮機２から吐出された冷媒は四方弁７を介して室外熱交換器３へと流れ、室外送風機４の駆動により室外熱交換器３で室外空気と熱交換して凝縮液化し、次に電動冷媒膨張弁１５を通過することにより減圧された冷媒は室内熱交換器１３で蒸発した後に、冷媒ガス管６を通り四方弁７を介して再び圧縮機２に吸入される。 In the refrigeration cycle having the above configuration, during cooling or dehumidifying operation, the refrigerant discharged from the compressor 2 flows to the outdoor heat exchanger 3 through the four-way valve 7 and is driven outdoor by the outdoor heat exchanger 3 by driving the outdoor blower 4. The refrigerant that has been condensed and liquefied by exchanging heat with air and then evaporated by passing through the electric refrigerant expansion valve 15 evaporates in the indoor heat exchanger 13, passes through the refrigerant gas pipe 6, and again through the four-way valve 7. It is sucked into the compressor 2.

次に、本発明の圧縮機周波数の制御及び冷媒吸入管の電動膨張弁の制御の流れについて
図２、図３を用いて説明する。 Next, the flow of control of the compressor frequency and control of the electric expansion valve of the refrigerant suction pipe according to the present invention will be described with reference to FIGS.

本発明の空気調和機の制御装置１９には、居住者が希望する運転モード切替スイッチ２０（冷房、ドライ、送風または暖房）と室内温度設定スイッチ２１と運転停止スイッチ２２で構成されている運転設定装置１８の信号を記憶する運転モード記憶装置２３と、室内吸込み温度検知装置１７と、室内吸込み温度の設定値を記憶する室内吸込み温度設定記憶装置２４と、室外吸込み温度検知装置１１と、室外吸い込み温度の設定値を記憶する室外吸込み温度設定記憶装置２５と、圧縮機２の冷媒吸入管８に設けられた吸入圧力検知装置１０と、吸入圧力値の上限設定値を記憶する吸入圧力設定記憶装置２９と以上の信号を定期的に検出するためのサンプリング時間を設定する運転時間設定記憶装置３０と、以上の信号をサンプリング時間毎受けて圧縮機２の運転周波数や圧縮機２の冷媒吸入管８に設けられた電動膨張弁９の弁開度を決定する判定装置３１と判定装置３１の信号により、圧縮機２や電動膨張弁９を駆動する出力リレー回路３２を有している。
居住者が運転停止スイッチ２２を選択すると、運転モード記憶装置２３、室内吸込み温度検知装置１７、室外吸込み温度検知装置１１、室内吸い込み温度設定記憶装置２４、室外吸い込み温度設定記憶装置２５の信号により判定装置３１が圧縮機２の基本運転周波数Hz0を決定し出力リレー回路３２が圧縮機２を駆動するが（図３、ＳＴＥＰ０）、室内温度設定スイッチ２１の信号と室内吸込み温度検知装置１７の信号の差が小さいと判定装置３１が判断すると圧縮機２の周波数を下げ（ＳＴＥＰ２）さげ小さい能力で運転を行なうが、このとき吸入圧力検知装置１０の値（Ｐｓ）が吸入圧力設定記憶装置２９の値（Ｐａ）を上回ると（ＳＴＥＰ３）、下回るまで電動膨張弁９のパルスを減じる様に制御を行う（現状パルスＰｅｘよりＰＡパルス減じ、流量が少なくなる方向へ制御）（ＳＴＥＰ４）。 The air conditioner control device 19 of the present invention has an operation setting composed of an operation mode changeover switch 20 (cooling, drying, air blowing or heating) desired by a resident, an indoor temperature setting switch 21 and an operation stop switch 22. An operation mode storage device 23 that stores a signal of the device 18, an indoor suction temperature detection device 17, an indoor suction temperature setting storage device 24 that stores a set value of the indoor suction temperature, an outdoor suction temperature detection device 11, and an outdoor suction. Outdoor suction temperature setting storage device 25 for storing temperature setting values, suction pressure detection device 10 provided in the refrigerant suction pipe 8 of the compressor 2, and suction pressure setting storage device for storing upper limit setting values of suction pressure values 29 and an operation time setting storage device 30 for setting a sampling time for periodically detecting the above signals, and receiving the above signals every sampling time The determination device 31 for determining the operating frequency of the compressor 2 and the valve opening degree of the electric expansion valve 9 provided in the refrigerant suction pipe 8 of the compressor 2 and the signal of the determination device 31 are used to control the compressor 2 and the electric expansion valve 9. It has an output relay circuit 32 for driving.
When the resident selects the operation stop switch 22, determination is made based on signals from the operation mode storage device 23, the indoor suction temperature detection device 17, the outdoor suction temperature detection device 11, the indoor suction temperature setting storage device 24, and the outdoor suction temperature setting storage device 25. The device 31 determines the basic operation frequency Hz0 of the compressor 2 and the output relay circuit 32 drives the compressor 2 (FIG. 3, STEP0), but the signals of the indoor temperature setting switch 21 and the indoor suction temperature detection device 17 When the determination device 31 determines that the difference is small, the frequency of the compressor 2 is lowered (STEP 2), and the operation is performed with a small capacity. At this time, the value (Ps) of the suction pressure detection device 10 is the value of the suction pressure setting storage device 29. When it exceeds (Pa) (STEP 3), control is performed so that the pulse of the electric expansion valve 9 is reduced until it falls below (PA pulse from the current pulse Pex). Reduced, control the direction of flow is reduced) (STEP4).

そして、この構成のよれば、圧縮機周波数低下による圧縮機吸入圧力に伴う圧縮機破壊を回避でき、機器の信頼性及び機器の信頼性及び圧縮機の信頼性が向上する。よって、圧縮機などの機器を保護しながらかつ快適性を損なわず効果的に空気調和装置の運転が可能となる。 And according to this structure, the compressor destruction accompanying the compressor suction pressure by the compressor frequency fall can be avoided, and the reliability of an apparatus, the reliability of an apparatus, and the reliability of a compressor improve. Therefore, it is possible to operate the air conditioner effectively while protecting equipment such as the compressor and without impairing comfort.

（実施の形態２）
図１は、本発明の実施の形態１における空気調和機の冷凍サイクル図の一例であり、図４は制御ブロック図、図５はフローチャート、図６は温度ゾーン図である。 (Embodiment 2)
1 is an example of a refrigeration cycle diagram of an air conditioner according to Embodiment 1 of the present invention, FIG. 4 is a control block diagram, FIG. 5 is a flowchart, and FIG. 6 is a temperature zone diagram.

本発明にかかる空気調和機の冷凍サイクル図は実施の形態１と同様なので説明は省略する。 Since the refrigeration cycle diagram of the air conditioner according to the present invention is the same as that of Embodiment 1, the description thereof is omitted.

次に、本発明の圧縮機周波数の制御及び冷媒吸入管の電動膨張弁の制御の流れについて
図４、図５、図６を用いて説明する。 Next, the flow of control of the compressor frequency and control of the electric expansion valve of the refrigerant suction pipe according to the present invention will be described with reference to FIGS. 4, 5, and 6.

本発明の空気調和機の制御装置１９には、居住者が希望する運転モード切替スイッチ２０（冷房、ドライ、送風または暖房）と室内温度設定スイッチ２１と運転停止スイッチ２２で構成されている運転設定装置１８の信号を記憶する運転モード記憶装置２３と、室内吸込み温度検知装置１７と、室内吸込み温度の設定値を記憶する室内吸込み温度設定記憶装置２４と、室外吸込み温度検知装置１１と、室外吸い込み温度の設定値を記憶する室外吸込み温度設定記憶装置２５と、室内熱交換器温度検知装置１６と、室内側の熱交換器温度の判定値を記憶する室内熱交換器温度設定記憶装置１（２６）,室内熱交換器温度設定記憶装置２（２７）と、圧縮機２の運転周波数の下限設定値を記憶する圧縮機最低周波数設定記憶装置２８と、圧縮機２の冷媒吸入管８に設けられた吸入圧力検知装置１０と、吸入圧力値の上限設定値を記憶する吸入圧力設定記憶装置２９と、以上の信号を定期的に検出するためのサンプリング時間を設定する運転時間設定記憶装置３０と、以上の信号をサンプリング時間毎受けて圧縮機２の運転周波数や圧縮機２の冷媒吸入管８に設けられた電動膨張弁９の弁開度を決定する判定装置３１と判定装置３１の信号により、圧縮機２や電動膨張弁９を駆動する出力リレー回路３２を有している。 The air conditioner control device 19 of the present invention has an operation setting composed of an operation mode changeover switch 20 (cooling, drying, air blowing or heating) desired by a resident, an indoor temperature setting switch 21 and an operation stop switch 22. An operation mode storage device 23 that stores a signal of the device 18, an indoor suction temperature detection device 17, an indoor suction temperature setting storage device 24 that stores a set value of the indoor suction temperature, an outdoor suction temperature detection device 11, and an outdoor suction. The outdoor suction temperature setting storage device 25 for storing the temperature setting value, the indoor heat exchanger temperature detection device 16, and the indoor heat exchanger temperature setting storage device 1 (26 for storing the indoor heat exchanger temperature determination value) ), The indoor heat exchanger temperature setting storage device 2 (27), the compressor minimum frequency setting storage device 28 for storing the lower limit setting value of the operating frequency of the compressor 2, and the compressor 2 The suction pressure detection device 10 provided in the refrigerant suction pipe 8, the suction pressure setting storage device 29 for storing the upper limit set value of the suction pressure value, and the operation for setting the sampling time for periodically detecting the above signals. A time setting storage device 30; a determination device 31 that receives the above signals every sampling time and determines the operating frequency of the compressor 2 and the valve opening degree of the electric expansion valve 9 provided in the refrigerant suction pipe 8 of the compressor 2; An output relay circuit 32 that drives the compressor 2 and the electric expansion valve 9 is provided by a signal from the determination device 31.

居住者が運転モード切替スイッチ２０で冷房またはドライを選択すると、運転モード記憶装置２３、室内吸込み温度検知装置１７、室外吸込み温度検知装置１１、室内吸い込み温度設定記憶装置２４、室外吸い込み温度設定記憶装置２５の信号により判定装置３１が圧縮機２の基本運転周波数Ｈｚ₀を決定し出力リレー回路３２が圧縮機２を駆動するが（図５、ＳＴＥＰ０）、室内吸い込み温度検知装置１７の値が室内吸込み温度設定記憶装置２４（ここでは例えば２７℃）、室外吸い込み温度検知装置１１の値が室外吸込み温度設定記憶装置２５（ここでは例えば２７℃）以下の場合は、吹き出し温度が低いと室内機１２の吹き出し回りに露がつく可能性があると判断し、図６に示す様に室内熱交換器１３の温度がＴｄ℃以下（図６のＣゾーン）に突入すると（ＳＴＥＰ９）判定装置３１が圧縮機２の運転周波数をダウン（ここでは例えば前の運転周波数の０．９倍の値）するように出力リレー回路３２に指示を出し、低い周波数で圧縮機２を駆動し圧縮機２の能力を低下させ、室内熱交換器１３の温度を上ることにより、吹き出し温度を上昇させ、吹き出し口の周りに露がつかない様に制御する（ＳＴＥＰ１２）。 When the resident selects cooling or dry with the operation mode changeover switch 20, the operation mode storage device 23, the indoor suction temperature detection device 17, the outdoor suction temperature detection device 11, the indoor suction temperature setting storage device 24, and the outdoor suction temperature setting storage device. The determination device 31 determines the basic operation frequency Hz ₀ of the compressor 2 based on the signal 25 and the output relay circuit 32 drives the compressor 2 (FIG. 5, STEP 0), but the value of the indoor suction temperature detection device 17 is the indoor suction. When the values of the temperature setting storage device 24 (here, for example, 27 ° C.) and the outdoor suction temperature detection device 11 are equal to or lower than the outdoor suction temperature setting storage device 25 (for example, 27 ° C. here), if the blowing temperature is low, the indoor unit 12 Judging that there is a possibility of dew around the blowout, the temperature of the indoor heat exchanger 13 is Td ° C. or lower as shown in FIG. (STEP 9), the determination device 31 instructs the output relay circuit 32 to lower the operating frequency of the compressor 2 (in this case, for example, 0.9 times the previous operating frequency). Then, the compressor 2 is driven to lower the capacity of the compressor 2 and the temperature of the indoor heat exchanger 13 is raised, thereby raising the blowing temperature and controlling the dew around the blowing outlet (STEP 12). .

判定装置３１は運転時間設定記憶装置３０に設定された時間ごとに以上の動作を繰り返すが、図６に示す様に、室内熱交換器温度１３の値がＴｃ℃以上（図６のＢゾーン）に上昇すると判定装置３１は圧縮機２の周波数ダウンをやめ、現周波数を維持する。このＢゾーンは室内機１２の吹き出し口に露が付かない各々の室内機固有の下限熱交換器温度に設定されている。 The determination device 31 repeats the above operation every time set in the operation time setting storage device 30, but, as shown in FIG. 6, the value of the indoor heat exchanger temperature 13 is Tc ° C. or more (B zone in FIG. 6). When it rises to, the determination device 31 stops the frequency reduction of the compressor 2 and maintains the current frequency. This B zone is set to the lower limit heat exchanger temperature unique to each indoor unit in which dew does not form at the outlet of the indoor unit 12.

再び温度がＴｄ℃以下（Ｃゾーンに突入）になると周波数ダウンを行うが、室内熱交換器１３の温度がＴａ℃以上（図６のＡゾーンに突入）になると（ＳＴＥＰ７）、判定装置３１は室内熱交換器１３の温度が十分高く、吹き出し温度も十分に高いと判断し、圧縮機２の運転周波数を基本運転周波数Ｈｚ₀に戻す様に制御を行う（ＳＴＥＰ８）。
しかし、室内熱交換器１３の温度がＴｄ℃以下（図６のＣゾーン）に突入し、判定装置３１が圧縮機２の運転周波数のダウンを繰り返すことにより、吸入圧力検知装置１０の値
（Ｐｓ）が吸入圧力設定記憶装置２９の値（Ｐａ）を上回る（ＳＴＥＰ５）、下回るまで電磁膨張弁９のパルスを減じる様に制御を行う（現状パルスＰｅｘよりＰＡパルス減じ、流量が少なくなる方向へ制御）（ＳＴＥＰ６）。 When the temperature again falls below Td ° C. (entering into the C zone), the frequency is reduced, but when the temperature of the indoor heat exchanger 13 reaches Ta ° C. or above (entering into the A zone in FIG. 6) (STEP 7), the judging device 31 It is determined that the temperature of the indoor heat exchanger 13 is sufficiently high and the blowing temperature is also sufficiently high, and control is performed so that the operation frequency of the compressor 2 is returned to the basic operation frequency Hz ₀ (STEP 8).
However, when the temperature of the indoor heat exchanger 13 falls below Td ° C. (C zone in FIG. 6) and the determination device 31 repeatedly decreases the operating frequency of the compressor 2, the value of the suction pressure detection device 10 (Ps ) Exceeds the value (Pa) of the suction pressure setting storage device 29 (STEP 5), and the control is performed so that the pulse of the electromagnetic expansion valve 9 is reduced until the value is lower (PA pulse is reduced from the current pulse Pex, and the flow rate is reduced). (STEP 6).

また、室内熱交換器１３の温度がＴｄ℃以下（図６のＣゾーン）に突入し、判定装置３１が圧縮機２の運転周波数のダウンを繰り返し、運転周波数（Ｈｚ）が運転周波数の下限値を設定した圧縮機最低周波数設定記憶装置２８の値（Ｈｚａ）に達すると（ＳＴＥＰ１０）、室内熱交換器１３の温度がＴｃ℃以上（図３のBゾーン）になるまで電磁膨張弁９のパルスを減じる様に制御を行う（現状パルスＰｅｘよりＰＡパルス減じ、流量が少なくなる方向へ制御）（ＳＴＥＰ１１）。 Further, the temperature of the indoor heat exchanger 13 enters Td ° C. or lower (C zone in FIG. 6), the determination device 31 repeatedly decreases the operating frequency of the compressor 2, and the operating frequency (Hz) is the lower limit value of the operating frequency. When the value (Hza) of the compressor minimum frequency setting storage device 28 that has set the value reaches (STEP 10), the pulse of the electromagnetic expansion valve 9 is kept until the temperature of the indoor heat exchanger 13 becomes Tc ° C. or higher (B zone in FIG. 3) (The control is performed so that the PA flow is reduced from the current pulse Pex and the flow rate is reduced) (STEP 11).

ここで、圧縮機最低周波数設定記憶装置２９の値は圧縮機２のメカ部にオイルを供給するのに必要な最低周波数で、これ以上周波数を下げるとオイルの供給が不足し、圧縮機２が破壊に至るという個々の圧縮機に固有の性能確保に大切で厳守すべき重要なスペックである。 Here, the value of the compressor minimum frequency setting storage device 29 is the minimum frequency required to supply oil to the mechanical part of the compressor 2. If the frequency is further reduced, the supply of oil becomes insufficient, and the compressor 2 It is an important specification that is important for ensuring the performance inherent to individual compressors leading to destruction.

そしてこの構成のよれば、空気調和装置の室内機の吹き出し口周りの露付きを回避できると同時に圧縮機吸入圧力の上昇による圧縮機破壊を回避でき、機器の信頼性及び圧縮機の信頼性が向上する。
よって、圧縮機などの機器を保護し、かつ快適性を損なわず効果的に空気調和装置の運転が可能となる。 According to this configuration, it is possible to avoid the dew around the air outlet of the indoor unit of the air conditioner, and at the same time, to avoid the destruction of the compressor due to the increase of the compressor suction pressure, thereby improving the reliability of the equipment and the reliability of the compressor. improves.
Therefore, it is possible to protect the equipment such as the compressor and to operate the air conditioner effectively without impairing comfort.

（実施の形態３）
図７は、本発明の実施の形態３における空気調和機の冷凍サイクル図の一例であり、図８は制御ブロック図、図９はフローチャート、図６は温度ゾーン図である。
図７において、室外機１にはインバータ駆動の容量（周波数）可変形圧縮機２（以下単に圧縮機と称す）と、室外熱交換器３と、室外送風機４、冷媒液管５と、冷媒ガス管６と、冷暖房切換用の四方弁７が設けられている。 (Embodiment 3)
7 is an example of a refrigeration cycle diagram of an air conditioner according to Embodiment 3 of the present invention, FIG. 8 is a control block diagram, FIG. 9 is a flowchart, and FIG. 6 is a temperature zone diagram.
In FIG. 7, the outdoor unit 1 includes an inverter-driven capacity (frequency) variable compressor 2 (hereinafter simply referred to as a compressor), an outdoor heat exchanger 3, an outdoor blower 4, a refrigerant liquid pipe 5, and a refrigerant gas. A pipe 6 and a four-way valve 7 for switching between heating and cooling are provided.

又、圧縮機２の冷媒吸入管８は途中で二本に分岐されており、一方の配管には電磁弁３４が設けられている。又圧縮機２の冷媒吸入管８には吸入圧力を検知する吸入圧力検知装置１０が設けられている。又、室外機１には室外の温度を検出する室外吸込み温度検知装置１１が設けられている。 Moreover, the refrigerant | coolant suction pipe 8 of the compressor 2 is branched into two on the way, and the solenoid valve 34 is provided in one piping. The refrigerant suction pipe 8 of the compressor 2 is provided with a suction pressure detection device 10 that detects the suction pressure. The outdoor unit 1 is provided with an outdoor suction temperature detection device 11 for detecting the outdoor temperature.

一方、室内機１２には室内熱交換器１３と、室内送風機１４と、室外機とつながる冷媒液管５と室内熱交換器１３の間にモータ等により弁開度をパルス制御可能な電動冷媒膨張弁１５と、室内熱交換器１３に熱交換器の温度を検出する室内熱交換器温度検知装置１６が設けられている。 On the other hand, the indoor unit 12 includes an indoor heat exchanger 13, an indoor fan 14, an electric refrigerant expansion capable of pulse-controlling the valve opening by a motor or the like between the refrigerant liquid pipe 5 connected to the outdoor unit and the indoor heat exchanger 13. The indoor heat exchanger temperature detecting device 16 for detecting the temperature of the heat exchanger is provided in the valve 15 and the indoor heat exchanger 13.

また、室内機１２には部屋の室温を検出する室内吸込み温度検知装置１７と、居住者が希望する運転モード（冷房または暖房）と室温と運転あるいは停止を設定できる運転設定装置１８が設けられている
上記構成の冷凍サイクルにおいて、冷房あるいは除湿運転時、圧縮機２から吐出された冷媒は四方弁７を介して室外熱交換器３へと流れ、室外送風機４の駆動により室外熱交換器３で室外空気と熱交換して凝縮液化し、次に電動冷媒膨張弁１５を通過することにより減圧された冷媒は室内熱交換器１３で蒸発した後に、冷媒ガス管６を通り四方弁７を介して再び圧縮機２に吸入される。 Further, the indoor unit 12 is provided with an indoor suction temperature detecting device 17 for detecting the room temperature of the room, and an operation setting device 18 for setting the operation mode (cooling or heating) desired by the resident and the room temperature and operation or stop. In the refrigeration cycle having the above-described configuration, during cooling or dehumidifying operation, the refrigerant discharged from the compressor 2 flows to the outdoor heat exchanger 3 via the four-way valve 7, and is driven by the outdoor blower 4 in the outdoor heat exchanger 3. The refrigerant is condensed and liquefied by exchanging heat with outdoor air, and then the refrigerant decompressed by passing through the electric refrigerant expansion valve 15 evaporates in the indoor heat exchanger 13, passes through the refrigerant gas pipe 6, and passes through the four-way valve 7. It is sucked into the compressor 2 again.

電磁弁３４が開の場合は分岐された２本の経路を通って、電磁弁３４が閉の場合は１本のみを通って圧縮機２に吸入される。 When the electromagnetic valve 34 is open, it passes through two branched paths, and when the electromagnetic valve 34 is closed, it passes through only one path and is sucked into the compressor 2.

次に、本発明の圧縮機周波数の制御及び冷媒吸入管の電磁弁の制御について説明する
本発明の空気調和機の制御装置１９には、居住者が希望する運転モード切替スイッチ２０（冷房、ドライ、送風または暖房）と室内温度設定スイッチ２１と運転停止スイッチ２２で構成されている運転設定装置１８の信号を記憶する運転モード記憶装置２３と、室内吸込み温度検知装置１７と、室内吸込み温度の設定値を記憶する室内吸込み温度設定記憶装置２４と、室外吸込み温度検知装置１１と、室外吸い込み温度の設定値を記憶する室外吸込み温度設定記憶装置２５と、室内熱交換器温度検知装置１６と、室内側の熱交換器温度の判定値を記憶する室内熱交換器温度設定記憶装置１（２６）、室内熱交換器温度設定記憶装置２（２７）と、圧縮機２の運転周波数の下限設定値を記憶する圧縮機最低周波数設定記憶装置２８と、
圧縮機２の冷媒吸入管８に設けられた吸入圧力検知装置１０と、吸入圧力値の上限設定値を記憶する吸入圧力設定記憶装置２９と以上の信号を定期的に検出するためのサンプリング時間を設定する運転時間設定記憶装置３０と、以上の信号をサンプリング時間毎受けて圧縮機２の運転周波数や圧縮機２の冷媒吸入管８に設けられた電磁弁３４の開閉を決定する判定装置３１と判定装置３１の信号により、圧縮機２や電磁弁３４を駆動する出力リレー回路３２を有している。 Next, the control device 19 for the air conditioner of the present invention, which explains the control of the compressor frequency and the control of the solenoid valve of the refrigerant suction pipe of the present invention, has an operation mode changeover switch 20 (cooling, dry operation) desired by the resident. , Ventilation or heating), an operation mode storage device 23 for storing signals of an operation setting device 18 constituted by an indoor temperature setting switch 21 and an operation stop switch 22, an indoor suction temperature detection device 17, and setting of the indoor suction temperature. Indoor suction temperature setting storage device 24 for storing values, outdoor suction temperature detection device 11, outdoor suction temperature setting storage device 25 for storing set values of outdoor suction temperature, indoor heat exchanger temperature detection device 16, and room The indoor heat exchanger temperature setting storage device 1 (26) for storing the judgment value of the inner heat exchanger temperature, the indoor heat exchanger temperature setting storage device 2 (27), and the compressor 2 A compressor lowest frequency setting storage unit 28 for storing a lower limit set value of the rolling frequency,
The suction pressure detection device 10 provided in the refrigerant suction pipe 8 of the compressor 2, the suction pressure setting storage device 29 for storing the upper limit setting value of the suction pressure value, and the sampling time for periodically detecting the above signals. An operating time setting storage device 30 to be set; a determination device 31 that receives the above signals every sampling time and determines the operating frequency of the compressor 2 and the opening and closing of the electromagnetic valve 34 provided in the refrigerant suction pipe 8 of the compressor 2; An output relay circuit 32 that drives the compressor 2 and the electromagnetic valve 34 is provided by a signal from the determination device 31.

居住者が運転モード切替スイッチ２０で冷房またはドライを選択すると、運転モード記憶装置２３、室内吸込み温度検知装置１７、室外吸込み温度検知装置１１、室内吸い込み温度設定記憶装置２４、室外吸い込み温度設定記憶装置２５の信号により判定装置３１が圧縮機２の基本運転周波数Ｈｚ₀を決定し出力リレー回路３２が圧縮機２を駆動するが（図９、ＳＴＥＰ０）、室内吸い込み温度検知装置１７の値が室内吸込み温度設定記憶装置２４（ここでは例えば２７℃）、室外吸い込み温度検知装１１の値が室外吸込み温度設定記憶装置２５（ここでは例えば２７℃）以下の場合は、吹き出し温度が低いと室内機１２の吹き出し回りに露がつく可能性があると判断し、図６に示す様に室内熱交換器１３の温度がＴｄ℃以下（図６のＣゾーン）に突入すると（ＳＴＥＰ１７）判定装置３１が圧縮機２の運転周波数をダウン（ここでは例えば前の運転周波数の０．９倍の値）するように出力リレー回路３２に指示を出し、低い周波数で圧縮機２を駆動し圧縮機２の能力を低下させ、室内熱交換器１３の温度を上ることにより、吹き出し温度を上昇させ、吹き出し口の周りに露がつかない様に制御する（ＳＴＥＰ２０）。 When the resident selects cooling or dry with the operation mode changeover switch 20, the operation mode storage device 23, the indoor suction temperature detection device 17, the outdoor suction temperature detection device 11, the indoor suction temperature setting storage device 24, and the outdoor suction temperature setting storage device. The determination device 31 determines the basic operating frequency Hz ₀ of the compressor 2 based on the signal 25 and the output relay circuit 32 drives the compressor 2 (FIG. 9, STEP 0), but the value of the indoor suction temperature detection device 17 is the indoor suction. When the value of the temperature setting storage device 24 (for example, 27 ° C.) and the outdoor suction temperature detection device 11 is equal to or lower than the outdoor suction temperature setting storage device 25 (for example, 27 ° C.), the blower temperature is low and the indoor unit 12 It is judged that there is a possibility of dew around the blowout, and the temperature of the indoor heat exchanger 13 is Td ° C. or lower as shown in FIG. (STEP 17), the determination device 31 issues an instruction to the output relay circuit 32 to lower the operating frequency of the compressor 2 (here, for example, 0.9 times the previous operating frequency). The compressor 2 is driven, the capacity of the compressor 2 is lowered, and the temperature of the indoor heat exchanger 13 is raised, thereby raising the blowout temperature and controlling the dew around the blowout opening (STEP 20).

判定装置３１は運転時間設定記憶装置３０に設定された時間ごとに以上の動作を繰り返すが、図６に示す様に、室内熱交換器温度１３の値がＴｃ℃以上（図６のＢゾーン）に上昇すると判定装置３１は圧縮機２の周波数ダウンやめ、現周波数を維持する。このＢゾーンは室内機１２の吹き出し口に露が付かない各々の室内機固有の下限熱交換器温度に設定されている。 The determination device 31 repeats the above operation every time set in the operation time setting storage device 30, but as shown in FIG. 6, the value of the indoor heat exchanger temperature 13 is Tc ° C. or more (B zone in FIG. 6). If it rises to, the determination device 31 stops the frequency of the compressor 2 and maintains the current frequency. This B zone is set to the lower limit heat exchanger temperature unique to each indoor unit in which dew does not form at the outlet of the indoor unit 12.

再び温度がＴd℃以下（Ｃゾーンに突入）になると周波数ダウンを行うが、室内熱交換器１３の温度がＴａ℃以上（図６のＡゾーンに突入）になると（ＳＴＥＰ１５）、判定装置３１は室内熱交換器１３の温度が十分高く、吹き出し温度も十分に高いと判断し、圧縮機２の運転周波数を基本運転周波数Ｈｚ₀に戻す様に制御を行う（ＳＴＥＰ１６）。 When the temperature falls below Td ° C. (entering into the C zone) again, the frequency is reduced, but when the temperature of the indoor heat exchanger 13 reaches Ta ° C. or more (entering into the A zone in FIG. 6) (STEP 15), the judging device 31 It is determined that the temperature of the indoor heat exchanger 13 is sufficiently high and the blowing temperature is also sufficiently high, and control is performed so that the operating frequency of the compressor 2 is returned to the basic operating frequency Hz ₀ (STEP 16).

しかし、室内熱交換器１３の温度がＴｄ℃以下（図６のＣゾーン）に突入し、判定装置３１が圧縮機２の運転周波数のダウンを繰り返すことにより、吸入圧力検知装置１０の値
（Ｐｓ）が吸入圧力設定記憶装置２９の値（Ｐａ）を上回ると（ＳＴＥＰ１３）、電磁弁３４をオフし、吸入圧力検知装置１０の値が下がるように制御を行う（流量が少なくなる方向へ制御）（ＳＴＥＰ１４）。 However, when the temperature of the indoor heat exchanger 13 falls below Td ° C. (C zone in FIG. 6) and the determination device 31 repeatedly decreases the operating frequency of the compressor 2, the value of the suction pressure detection device 10 (Ps ) Exceeds the value (Pa) of the suction pressure setting storage device 29 (STEP 13), the solenoid valve 34 is turned off, and control is performed so that the value of the suction pressure detection device 10 decreases (control in a direction in which the flow rate decreases). (STEP 14).

又、室内熱交換器１３の温度がＴｄ℃以下（図３のＣゾーン）に突入し、判定装置３１が圧縮機２の運転周波数のダウンを繰り返し、運転周波数（Ｈｚ）が運転周波数の下限値を設定した圧縮機最低周波数設定記憶装置２８の値（Ｈｚａ）に達すると（ＳＴＥＰ１８）、
電磁弁３４をオフし、室内熱交換器１３の温度が上がるように制御を行う（ＳＴＥＰ１９）。 Moreover, the temperature of the indoor heat exchanger 13 enters Td ° C. or lower (C zone in FIG. 3), the determination device 31 repeatedly decreases the operating frequency of the compressor 2, and the operating frequency (Hz) is the lower limit value of the operating frequency. When the value (Hza) of the compressor minimum frequency setting storage device 28 that has been set is reached (STEP 18),
The solenoid valve 34 is turned off, and control is performed so that the temperature of the indoor heat exchanger 13 increases (STEP 19).

これらの制御や負荷変動により室内熱交換器１３の温度がＴａ℃以上（図６のＡゾーンに突入）になると（ＳＴＥＰ１５）圧縮機２の運転周波数を基本運転周波数Ｈｚ₀に戻す様に制御を行うが、（ＳＴＥＰ１６）このとき吸入圧力検知装置１０の値（Ｐｓ）が吸入圧力設定記憶装置２９の値（Ｐａ）を下回る（ＳＴＥＰ２１）電磁弁２２をオンするように制御を行う（ＳＴＥＰ２２）。 When the temperature of the indoor heat exchanger 13 becomes Ta ° C. or higher (rushes into the A zone of FIG. 6) due to these controls and load fluctuations (STEP 15), control is performed so that the operating frequency of the compressor 2 is returned to the basic operating frequency Hz _0. (STEP 16) At this time, the value (Ps) of the suction pressure detection device 10 falls below the value (Pa) of the suction pressure setting storage device 29 (STEP 21). Control is performed so that the electromagnetic valve 22 is turned on (STEP 22).

また、電磁弁３４が設けられている分岐管３３は電磁弁３４が設けられていない分岐管より配管内径が十分大きく、電磁弁３４がオンの時はこちらに多くの冷媒が流れ、オフの時は室内熱交換器１３の出口圧力と圧縮機２の吸入圧力の差が十分大きくなるように設定されている。 Further, the branch pipe 33 provided with the solenoid valve 34 has a sufficiently larger pipe inner diameter than the branch pipe not provided with the solenoid valve 34. When the solenoid valve 34 is turned on, a large amount of refrigerant flows therethrough, and when the solenoid pipe 34 is turned off. Is set so that the difference between the outlet pressure of the indoor heat exchanger 13 and the suction pressure of the compressor 2 is sufficiently large.

そしてこの構成のよれば、空気調和装置の室内機の吹き出し口周りの露付きを回避できると同時に圧縮機吸入圧力の上昇による圧縮機破壊を回避でき、機器の信頼性及び圧縮機の信頼性が向上する。
よって、圧縮機などの機器を保護しながらかつ快適性を損なわず効果的に空気調和装置の運転が可能となる。 According to this configuration, it is possible to avoid the dew around the air outlet of the indoor unit of the air conditioner, and at the same time, to avoid the destruction of the compressor due to the increase of the compressor suction pressure, thereby improving the reliability of the equipment and the reliability of the compressor. improves.
Therefore, it is possible to operate the air conditioner effectively while protecting equipment such as the compressor and without impairing comfort.

本発明の第１ならびに第２の実施の形態の冷凍サイクル図Refrigeration cycle diagram of the first and second embodiments of the present invention 本発明の第１の実施の形態の制御ブロック図Control block diagram of the first embodiment of the present invention 本発明の第１の実施の形態のフローチャートFlowchart of the first embodiment of the present invention 本発明の第２の実施の形態の制御ブロック図Control block diagram of the second embodiment of the present invention 本発明の第２の実施の形態のフローチャートFlowchart of the second embodiment of the present invention 温度ゾーン図Temperature zone diagram 冷凍サイクル図Refrigeration cycle diagram 本発明の第３の実施の形態の制御ブロック図Control block diagram of the third embodiment of the present invention 本発明の第３の実施の形態のフローチャートFlowchart of the third embodiment of the present invention 従来の温度ゾーン図Conventional temperature zone diagram

符号の説明Explanation of symbols

１室外機
２圧縮機
３室外熱交換器
４室外送風機
５冷媒液管
６冷媒ガス管
７四方弁
８冷媒吸入管
９電動膨張弁
１０吸入圧力検知装置
１１室外吸込み温度検知装置
１２室内機
１３室内熱交換器
１４室内送風機
１５電動冷媒膨張弁
１６室内熱交換器検知装置
１７室内吸込み温度検知装置
１８運転設定装置
１９制御装置
２４室内吸込み温度設定記憶装置
２５室外吸込み温度設定記憶装置
２６室内熱交換器温度設定記憶装置１
２７室内熱交換器温度設定記憶装置２
２８圧縮機最低周波数設定記憶装置
２９吸入圧力設定記憶装置
３４電磁弁 DESCRIPTION OF SYMBOLS 1 Outdoor unit 2 Compressor 3 Outdoor heat exchanger 4 Outdoor fan 5 Refrigerant liquid pipe 6 Refrigerant gas pipe 7 Four-way valve 8 Refrigerant suction pipe 9 Electric expansion valve 10 Suction pressure detection device 11 Outdoor suction temperature detection device 12 Indoor unit 13 Indoor heat Exchanger 14 Indoor blower 15 Electric refrigerant expansion valve 16 Indoor heat exchanger detection device 17 Indoor suction temperature detection device 18 Operation setting device 19 Control device 24 Indoor suction temperature setting storage device 25 Outdoor suction temperature setting storage device 26 Indoor heat exchanger temperature Setting storage device 1
27 Indoor heat exchanger temperature setting storage device 2
28 Compressor Minimum Frequency Setting Storage Device 29 Suction Pressure Setting Storage Device 34 Solenoid Valve

Claims

圧縮機、室外熱交換器、送風機、冷媒液管、冷媒ガス管とを有する室外機と、熱交換器及び送風機を有する室内機を接続し、前記冷媒液管の途中に電動冷媒膨張弁を介装して冷凍サイクルを構成し、少なくとも前記室外機の冷媒吸入管に吸入圧力検知装置と冷媒流量調整装置を設け、前記吸入圧力検知装置の制御装置の信号により前記冷媒流量調整装置を制御する制御装置を設けたことを特徴とする空気調和装置。 An outdoor unit having a compressor, an outdoor heat exchanger, a blower, a refrigerant liquid pipe, and a refrigerant gas pipe is connected to an indoor unit having a heat exchanger and a blower, and an electric refrigerant expansion valve is interposed in the refrigerant liquid pipe. And a refrigerating cycle is installed, and at least a refrigerant suction pipe of the outdoor unit is provided with a suction pressure detection device and a refrigerant flow rate adjustment device, and the refrigerant flow rate adjustment device is controlled by a signal from the control device of the suction pressure detection device An air conditioner provided with a device.

室外機に少なくとも室外吸込み温度を検出する室外吸込み温度検知装置と前記室内機に室内吸込み温度を検出する室内吸込み温度検知装置と室内機の熱交換器に熱交換器の温度を検出する室内熱交換器温度検知装置とを設け、前記室外吸込み温度検知装置と前記室内吸込み温度検知装置と前記室内熱交換器温度検知装置との信号により圧縮機の回転数と電動膨張弁を制御し、さらに、吸入圧力検知装置と室内熱交換器温度検知装と前記圧縮機の制御装置の信号により、冷媒流量調整装置を制御する制御装置を設けたことを特徴とする、請求項１記載の空気調和装置。 An outdoor suction temperature detection device for detecting at least the outdoor suction temperature in the outdoor unit, an indoor suction temperature detection device for detecting the indoor suction temperature in the indoor unit, and an indoor heat exchange for detecting the temperature of the heat exchanger in the heat exchanger of the indoor unit And a compressor rotation speed and an electric expansion valve are controlled by signals from the outdoor suction temperature detection device, the indoor suction temperature detection device, and the indoor heat exchanger temperature detection device. 2. The air conditioner according to claim 1, further comprising a control device that controls the refrigerant flow rate adjusting device based on signals from a pressure detection device, an indoor heat exchanger temperature detection device, and a control device of the compressor.

吸入管の一部を少なくとも２本に分岐された分岐管で構成し、前記分岐管の少なくとも１本に電磁二方弁を設け、吸入圧力検知装置と室内熱交換器温度検知装置と圧縮機の制御装置の信号により、前記電磁二方弁を開閉制御する制御装置を設けたことを特徴とする、請求項２記載の空気調和装置。 A part of the suction pipe is constituted by a branch pipe branched into at least two, and an electromagnetic two-way valve is provided in at least one of the branch pipes, and the suction pressure detection device, the indoor heat exchanger temperature detection device, and the compressor The air conditioning apparatus according to claim 2, further comprising a control device that controls opening and closing of the electromagnetic two-way valve according to a signal from the control device.