JPH01312345A - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JPH01312345A JPH01312345A JP63141775A JP14177588A JPH01312345A JP H01312345 A JPH01312345 A JP H01312345A JP 63141775 A JP63141775 A JP 63141775A JP 14177588 A JP14177588 A JP 14177588A JP H01312345 A JPH01312345 A JP H01312345A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- outdoor
- compressor
- indoor
- heat exchanger
- 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.)
- Pending
Links
- 238000001816 cooling Methods 0.000 claims abstract description 22
- 230000004044 response Effects 0.000 abstract description 3
- 238000007710 freezing Methods 0.000 abstract description 2
- 230000008014 freezing Effects 0.000 abstract description 2
- 239000002826 coolant Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 230000007423 decrease Effects 0.000 description 9
- 239000003507 refrigerant Substances 0.000 description 8
- 230000005494 condensation Effects 0.000 description 7
- 238000009833 condensation Methods 0.000 description 7
- 238000005265 energy consumption Methods 0.000 description 6
- 238000005057 refrigeration Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Air Conditioning Control Device (AREA)
Abstract
Description
【発明の詳細な説明】
[発明の目的]
(産業上の利用分野)
この発明は能力可変圧縮機を備えた空気調和機の改良に
関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) This invention relates to an improvement in an air conditioner equipped with a variable capacity compressor.
(従来の技術)
一般に、空気調和機の冷房運転時に凝縮器として機能す
る室外側熱交換器の凝縮圧力は室外温度に応じて変化す
ることが知られている。例えば、冷房運転中に室外温度
が低下すると室外側熱交換器の凝縮圧力が低下する。こ
の場合、室外側熱交換器の凝縮圧力が低下すると冷凍サ
イクル中の圧縮機の摺動部を潤滑する冷凍機油の循環が
悪くなるおそれがあるとともに、冷媒の液バツク等によ
って圧縮不良が発生し、圧縮機の信頼性を低下させる問
題があった。(Prior Art) Generally, it is known that the condensing pressure of an outdoor heat exchanger that functions as a condenser during cooling operation of an air conditioner changes depending on the outdoor temperature. For example, when the outdoor temperature decreases during cooling operation, the condensing pressure of the outdoor heat exchanger decreases. In this case, if the condensing pressure of the outdoor heat exchanger decreases, there is a risk that the circulation of the refrigeration oil that lubricates the sliding parts of the compressor in the refrigeration cycle will deteriorate, and poor compression may occur due to liquid backing of the refrigerant. , there was a problem that reduced the reliability of the compressor.
そこで、冷房運転時に凝縮器として機能する室外側熱交
換器の冷媒出口に室外側熱交換器の凝縮温度を検出する
凝縮温度センサを設けるとともに、この凝縮温度センサ
からの検出信号に応じて室外ファンの回転数を可変操作
する回転数制御機構を設け、冷房運転中に室外側熱交換
器の凝縮温度が設定値以下に低下した場合には室外ファ
ンの回転数を低速回転状態に切換え操作することにより
、凝縮圧力を上昇させる凝縮圧力制御機能を備えたもの
が開発されている。この場合、従来構成のものにあって
は室外ファンの回転数を低速回転状態に切換え操作する
際の凝縮温度の設定値は一定値に固定されていた。Therefore, a condensing temperature sensor that detects the condensing temperature of the outdoor heat exchanger is installed at the refrigerant outlet of the outdoor heat exchanger that functions as a condenser during cooling operation, and the outdoor fan A rotation speed control mechanism is provided to variably control the rotation speed of the outdoor fan, and when the condensing temperature of the outdoor heat exchanger falls below a set value during cooling operation, the rotation speed of the outdoor fan is switched to a low speed rotation state. Accordingly, a device equipped with a condensing pressure control function to increase the condensing pressure has been developed. In this case, in the conventional configuration, the set value of the condensing temperature when switching the rotation speed of the outdoor fan to a low speed rotation state was fixed at a constant value.
しかしながら、冷凍サイクル中に能力可変圧縮機を装着
させた場合には例えば圧縮機の運転周波数が低い状態(
圧縮機の低速運転状態)では運転周波数が高い(圧縮機
の高速運転状態)場合に比べて冷媒循環量が低下し、凝
縮圧力が低下するので、室外ファンの回転数を低速回転
状態に切換え操作する際の凝縮温度の設定値が一定の場
合には例えば圧縮機の運転周波数が低い場合に室外温度
が高い条件であっても室外ファンの回転数が低速回転状
態に切換え操作され、凝縮圧力が上昇するおそれがある
。そのため、この場合には入力が増大するので、消費エ
ネルギーが増大し、運転効率が低下する問題があった。However, when a variable capacity compressor is installed in the refrigeration cycle, for example, when the operating frequency of the compressor is low (
When the operating frequency is high (compressor running at low speed), the refrigerant circulation volume is lower than when the compressor is running at high speed, and the condensing pressure is lower. If the set value of the condensing temperature is constant, for example, if the operating frequency of the compressor is low, even if the outdoor temperature is high, the rotation speed of the outdoor fan will be switched to a low speed rotation state, and the condensing pressure will increase. There is a risk that it will rise. Therefore, in this case, since the input increases, there is a problem that energy consumption increases and operational efficiency decreases.
(発明が解決しようとする課題)
従来構成のものにあっては室外ファンの回転数を低速回
転状態に切換え操作する際の凝縮温度の設定値は一定値
に固定されていたので、能力可変圧縮機の運転周波数が
低い場合に室外温度が高い条件であっても室外ファンの
回転数が低速回転状態に切換え操作され、凝縮圧力が上
昇するおそれかあり、入力の増大にともない消費エネル
ギーが増大し、運転効率が低下する問題があった。(Problem to be solved by the invention) In the conventional configuration, the set value of the condensing temperature when switching the rotation speed of the outdoor fan to a low speed rotation state was fixed at a constant value. When the operating frequency of the machine is low, the rotation speed of the outdoor fan may be switched to a low speed rotation state even when the outdoor temperature is high, and the condensing pressure may increase, resulting in an increase in energy consumption as the input increases. , there was a problem of reduced operating efficiency.
この発明は上記事情に着目してなされたもので、能力可
変圧縮機の運転周波数が低い場合に室外温度が高い状態
で室外ファンの回転数が低速回転状態に切換え操作され
ることを防止することができ、消費エネルギーを低減し
、運転効率の向上を図ることができる空気調和機を提供
することを目的とするものである。This invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to prevent the rotation speed of an outdoor fan from being switched to a low speed rotation state when the outdoor temperature is high when the operating frequency of a variable capacity compressor is low. The object of the present invention is to provide an air conditioner that can reduce energy consumption and improve operating efficiency.
[発明の構成]
(課題を解決するための手段)
この発明は能力可変圧縮機の運転周波数に応じて室外フ
ァンの回転速度切換え用の設定温度を可変する設定温度
可変手段を設けたものである。[Structure of the Invention] (Means for Solving the Problems) The present invention is provided with a set temperature variable means for varying the set temperature for switching the rotational speed of an outdoor fan according to the operating frequency of a variable capacity compressor. .
(作用)
能力可変圧縮機の運転周波数に応じて室外ファンの回転
速度切換え用の設定温度を可変させることにより、能力
可変圧縮機の運転周波数が低い場合に室外温度が高い状
態で室外ファンの回転数が低速回転状態に切換え操作さ
れることを防止して消費エネルギーを低減し、運転効率
の向上を図るようにしたものである。(Function) By varying the set temperature for switching the rotation speed of the outdoor fan in accordance with the operating frequency of the variable capacity compressor, the rotation of the outdoor fan can be controlled when the operating frequency of the variable capacity compressor is low and the outdoor temperature is high. This prevents the number from being switched to a low-speed rotation state, thereby reducing energy consumption and improving operating efficiency.
(実施例) 以下、この発明の一実施例を図面を参照して説明する。(Example) An embodiment of the present invention will be described below with reference to the drawings.
第1図は空気調和機全体の概略構成を示すもので、1は
能力可変圧縮機、2は四方弁、3は室外側熱交換器、4
は室内側熱交換器である。Figure 1 shows the schematic configuration of the entire air conditioner, where 1 is a variable capacity compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, and 4 is a variable capacity compressor.
is an indoor heat exchanger.
この場合、四方弁2の第1のポートには能力可変圧縮機
1の吐出側、第2のポートにはこの圧縮機1の吸込み側
をそれぞれ冷媒管を介して連結させている。さらに、こ
の四方弁2の第3のポートには室外側熱交換器3の一端
側、第4のポートには室内側熱交換器4の一端側をそれ
ぞれ冷媒管を介して連結させている。また、室外側熱交
換器3の他端側と室内側熱交換器4の他端側との間を連
結する冷媒管には膨張弁5を介設させている。そして、
これらの能力可変圧縮機1、四方弁2、室外側熱交換器
3、膨張弁5、室内側熱交換器4によってヒートポンプ
式冷凍サイクルを構成させている。In this case, the first port of the four-way valve 2 is connected to the discharge side of the variable capacity compressor 1, and the second port is connected to the suction side of the compressor 1 via refrigerant pipes. Furthermore, one end of the outdoor heat exchanger 3 is connected to the third port of the four-way valve 2, and one end of the indoor heat exchanger 4 is connected to the fourth port through refrigerant pipes. Furthermore, an expansion valve 5 is interposed in the refrigerant pipe that connects the other end of the outdoor heat exchanger 3 and the other end of the indoor heat exchanger 4. and,
These variable capacity compressor 1, four-way valve 2, outdoor heat exchanger 3, expansion valve 5, and indoor heat exchanger 4 constitute a heat pump type refrigeration cycle.
さらに、室外側熱交換器3の近傍には室外ファン6、室
内側熱交換器4の近傍には室内ファン7をそれぞれ配設
させている。そして、能力可変圧縮機1、四方弁2、室
外側熱交換器3、膨張弁5および室外ファン6等の各機
器は室外ユニットA内に一体的に収納させているととも
に、室内側熱交換器4および室内ファン7は室内ユニッ
トB内に一体的に収納させている。Further, an outdoor fan 6 is provided near the outdoor heat exchanger 3, and an indoor fan 7 is provided near the indoor heat exchanger 4. The variable capacity compressor 1, four-way valve 2, outdoor heat exchanger 3, expansion valve 5, outdoor fan 6, and other devices are integrally housed in the outdoor unit A, and the indoor heat exchanger 4 and the indoor fan 7 are integrally housed within the indoor unit B.
一方、第1図中で、8は例えばマイクロコンピュータお
よびその周辺回路によって形成される室内制御部、9は
この室内制御部8にシリアル信号ラインを介して接続さ
せた例えばマイクロコンピュータおよびその周辺回路に
よって形成される室外制御部である。この場合、室内制
御部8には室内ファン7、室内側熱交換器4の温度を検
出する室内熱交換器温度センサ10.室内温度を検出す
る室内温度センサ11をそれぞれ接続させているととも
に、リモートコントロール式の操作部12を接続させて
いる。さらに、この操作部12には運転スイッチ、冷暖
切換えスイッチ、風量設定部および温度設定部等をそれ
ぞれ設けている。On the other hand, in FIG. 1, 8 is an indoor control section formed by, for example, a microcomputer and its peripheral circuits, and 9 is an indoor control section formed by, for example, a microcomputer and its peripheral circuits connected to this indoor control section 8 via a serial signal line. This is an outdoor control section formed. In this case, the indoor control unit 8 includes an indoor fan 7 and an indoor heat exchanger temperature sensor 10 that detects the temperature of the indoor heat exchanger 4. An indoor temperature sensor 11 that detects the indoor temperature is connected to each, and a remote control type operation section 12 is also connected. Further, the operation section 12 is provided with an operation switch, a heating/cooling changeover switch, an air volume setting section, a temperature setting section, and the like.
また、室外制御部9にはインバータ回路13、四方弁2
、室外ファン6をそれぞれ接続させているとともに、冷
房運転時に室外側熱交換器3の凝縮温度を検出する凝縮
温度センサ14、室外温度を検出する室外温度センサ1
5をそれぞれ接続させている。この場合、インバータ回
路13は交流電源16の電圧を整流し、それを室外制御
部9の指令に応じたスイッチングによって所定周波数の
交流電圧に変換し、能力可変圧縮機1の圧縮機モータに
駆動電力として供給するものである。また、凝縮温度セ
ンサ14は冷房運転時に室外側熱交換器3の冷媒出口に
設置させている。The outdoor control unit 9 also includes an inverter circuit 13 and a four-way valve 2.
, a condensing temperature sensor 14 that detects the condensing temperature of the outdoor heat exchanger 3 during cooling operation, and an outdoor temperature sensor 1 that detects the outdoor temperature.
5 are connected to each other. In this case, the inverter circuit 13 rectifies the voltage of the AC power supply 16 and converts it into an AC voltage of a predetermined frequency by switching according to the command from the outdoor control unit 9, and provides driving power to the compressor motor of the variable capacity compressor 1. It is provided as follows. Further, the condensing temperature sensor 14 is installed at the refrigerant outlet of the outdoor heat exchanger 3 during cooling operation.
次に、上記構成の作用について説明する。まず、ヒート
ポンプ式冷凍サイクルの冷房運転時には第1図中に実線
矢印で示すように能力可変圧縮機1からの吐出冷媒を四
方弁2、室外側熱交換器3、膨張弁5、室内側熱交換器
4、四方弁2を順次介して圧縮機1の吸込み側に吸込ま
せる冷房運転用のサイクルが形成される。また、室内制
御部8には操作部12によって設定させた風量や設定温
度等の運転条件を入力させているとともに、室内熱交換
器温度センサ10および室内温度センサ11からの出力
信号を入力させている。そして、設定温度と室内温度セ
ンサ11の検出温度との温度差に対応する周波数設定信
号を室内制御部8から室外制御部9に転送させている。Next, the operation of the above configuration will be explained. First, during cooling operation of the heat pump type refrigeration cycle, the refrigerant discharged from the variable capacity compressor 1 is transferred to the four-way valve 2, the outdoor heat exchanger 3, the expansion valve 5, and the indoor heat exchanger as shown by the solid line arrow in FIG. A cycle for cooling operation is formed in which air is sucked into the suction side of the compressor 1 through the compressor 4 and the four-way valve 2 sequentially. Further, the indoor control unit 8 is inputted with operating conditions such as air volume and set temperature set by the operation unit 12, and output signals from the indoor heat exchanger temperature sensor 10 and the indoor temperature sensor 11 are inputted. There is. Then, a frequency setting signal corresponding to the temperature difference between the set temperature and the temperature detected by the indoor temperature sensor 11 is transferred from the indoor control section 8 to the outdoor control section 9.
さらに、室外制御部9では室内制御部8から転送された
周波数設定信号に基づいて圧縮機1の運転周波数(イン
バータ回路13の出力周波数)fを制御する。Furthermore, the outdoor control section 9 controls the operating frequency f of the compressor 1 (output frequency of the inverter circuit 13) based on the frequency setting signal transferred from the indoor control section 8.
また、室外制御部9には凝縮温度センサ14からの出力
信号を入力させている。そして、この人力信号に応じて
室外制御部9では第2図に示すように凝縮温度センサ1
4からの検出凝縮温度Tが■・・・・・・T≧Taの場
合には室外ファン6を高速運転、
■・・・・・・T<Tbの場合には室外ファン6を低速
運転、
に切換えることにより外気温度変化に応じた凝縮圧力制
御を行なわせている。Further, an output signal from the condensation temperature sensor 14 is inputted to the outdoor control section 9 . Then, in response to this human input signal, the outdoor control unit 9 detects the condensation temperature sensor 1 as shown in FIG.
If the detected condensation temperature T from 4 is ■...T≧Ta, the outdoor fan 6 is operated at high speed; ■......If T<Tb, the outdoor fan 6 is operated at low speed; By switching to , condensing pressure is controlled according to changes in outside air temperature.
このとき、室外制御部9では圧縮機1の運転周波数fに
応じて室外ファン6の回転速度切換え用の設定温度Ta
5Tbを可変する設定温度可変制御を行なわせている。At this time, the outdoor control unit 9 sets a set temperature Ta for switching the rotational speed of the outdoor fan 6 according to the operating frequency f of the compressor 1.
A variable set temperature control is performed to vary 5Tb.
この設定温度可変制御は次のように行なう。This set temperature variable control is performed as follows.
すなわち、例えば外気温度が一定の場合には第3図に示
すように圧縮機1の運転周波数fが低いf3の状態では
凝縮圧力が低いので、この凝縮圧力低下分を考慮して低
く設定したtb3で室外ファン6の回転速度を高速運転
状態から低速運転状態に切換える。そして、圧縮機1の
運転周波数fがf2、flにそれぞれ上昇した場合には
室外ファン6の回転速度を高速運転状態から低速運転状
態に切換える設定温度をtbl、tblにそれぞれ変化
(上昇)させる。That is, for example, when the outside air temperature is constant, the condensing pressure is low when the operating frequency f of the compressor 1 is low f3 as shown in FIG. The rotational speed of the outdoor fan 6 is switched from a high-speed operating state to a low-speed operating state. Then, when the operating frequency f of the compressor 1 increases to f2 and fl, respectively, the set temperature at which the rotational speed of the outdoor fan 6 is switched from the high speed operating state to the low speed operating state is changed (increased) to tbl and tbl, respectively.
また、外気温度が上昇した場合には室外ファン6の回転
速度を低速運転状態から高速運転状態に切換えて凝縮圧
力を低下させ、高圧カット等を防止する。この場合も圧
縮機1の運転周波数fが低いf3の状態では低く設定し
たta3で室外ファン6の回転速度を低速運転状態から
高速運転状態に切換える。そして、圧縮機1の運転周波
数fがf2、f、にそれぞれ上昇した場合には室外ファ
ン6の回転速度を低速運転状態から高速運転状態に切換
える設定温度をia2、jalにそれぞれ変化(上昇)
させる。Furthermore, when the outside air temperature rises, the rotational speed of the outdoor fan 6 is switched from a low-speed operating state to a high-speed operating state to reduce the condensing pressure and prevent high-pressure cuts and the like. In this case as well, when the operating frequency f of the compressor 1 is f3, which is low, the rotational speed of the outdoor fan 6 is switched from the low-speed operating state to the high-speed operating state at the low setting ta3. Then, when the operating frequency f of the compressor 1 increases to f2 and f, respectively, the set temperature at which the rotational speed of the outdoor fan 6 is switched from the low-speed operating state to the high-speed operating state is changed (increased) to ia2 and jal, respectively.
let
そこで、上記構成のものにあっては能力可変圧縮機lの
運転周波数fに応じて室外ファン6の回転速度切換え用
の設定温度ta、tbを可変させたので、能力可変圧縮
機1の運転周波数fの変化に関係なく、路間−の外気温
度条件で室外ファン6の回転速度および凝縮圧力制御を
行なうことができる。そのため、従来のように能力可変
圧縮機1の運転周波数fが低い場合に室外温度が高い状
態で室外ファン6の回転数が低速回転状態に切換え操作
されることを防止することができるので、消費エネルギ
ーを低減し、運転効率の向上を図ることができる。Therefore, in the above configuration, the set temperatures ta and tb for switching the rotation speed of the outdoor fan 6 are varied according to the operating frequency f of the variable capacity compressor 1, so that the operating frequency of the variable capacity compressor 1 is changed. Regardless of the change in f, the rotational speed and condensing pressure of the outdoor fan 6 can be controlled based on the outside air temperature conditions between the paths. Therefore, it is possible to prevent the rotation speed of the outdoor fan 6 from being switched to a low speed rotation state when the outdoor temperature is high when the operating frequency f of the variable capacity compressor 1 is low as in the conventional case. It is possible to reduce energy consumption and improve operational efficiency.
また、第4図に示すように冷房運転中、能力可変圧縮機
1の運転周波数fがfd、fc、fb。Further, as shown in FIG. 4, during the cooling operation, the operating frequencies f of the variable capacity compressor 1 are fd, fc, and fb.
faにそれぞれ低下するにしたがって室外ファン6の回
転数Nを運転周波数fd−fc間ではN3、運転周波数
fc−fb間ではN2、運転周波数fb−fa間ではN
lにそれぞれステ・ツブ的に低下させる構成にしてもよ
い。なお、室外ファン6の回転数Nは能力可変圧縮機1
の運転周波数fの低下にしたがって略直線状に連続的に
低下させる構成にしてもよい。As fa increases, the rotation speed N of the outdoor fan 6 is set to N3 between operating frequencies fd and fc, N2 between operating frequencies fc and fb, and N between operating frequencies fb and fa.
It is also possible to adopt a configuration in which the values are lowered step by step. Note that the rotation speed N of the outdoor fan 6 is the same as that of the variable capacity compressor 1.
It may be configured to continuously lower the operating frequency f in a substantially linear manner as the operating frequency f decreases.
この場合には圧縮機1の運転周波数fが低下するにした
がって室外ファン6の回転数Nを低下させることができ
るので、外気温度が低下した場合に凝縮圧力の上昇の割
合いを従来に比べて大きくさせることができる。そのた
め、外気温度の低下時に凝縮圧力の低下による圧縮機1
内の摺動部の潤滑不足を圧縮機1の運転周波数fの低下
時であっても改善することができる。さらに、外気温度
の低下時に圧縮機1への液バ・ツクを防止することがで
き、圧縮機1の使用範囲の拡大を図ることができるとと
もに、信頼性の向上を図ることができる。In this case, the rotation speed N of the outdoor fan 6 can be lowered as the operating frequency f of the compressor 1 is lowered, so that the rate of increase in condensing pressure when the outside air temperature decreases is lower than in the past. You can make it bigger. Therefore, when the outside air temperature decreases, the compressor 1 due to the decrease in condensing pressure
Insufficient lubrication of the sliding parts inside the compressor 1 can be improved even when the operating frequency f of the compressor 1 is reduced. Further, it is possible to prevent liquid backing up to the compressor 1 when the outside air temperature drops, and it is possible to expand the range of use of the compressor 1 and improve reliability.
また、空気調和機本5体の冷房運転中の室外ファン6の
ファンモータを第5図のフローチャートにしたがって制
御する構成にしてもよい。すなわち、空気調和機本体の
冷房運転の開始時には圧縮機1をオン操作すると同時に
室外ファン6のファンモータを高速運転状態で駆動させ
る始動制御運転を行なわせる。さらに、冷房運転の開始
と同時に運転時間T1のカウントを開始させ、冷房運転
の開始後、予め設定された一定時間が経過した時点Tで
、この始動制御運転を通常運転状態に移行させる。Alternatively, the fan motor of the outdoor fan 6 during cooling operation of the five air conditioners may be controlled according to the flowchart shown in FIG. That is, at the start of the cooling operation of the air conditioner main body, the compressor 1 is turned on, and at the same time, a start control operation is performed in which the fan motor of the outdoor fan 6 is driven at high speed. Furthermore, counting of the operating time T1 is started at the same time as the start of the cooling operation, and at a time point T when a preset certain period of time has elapsed after the start of the cooling operation, the start control operation is transferred to the normal operating state.
このように通常運転状態に移行すると凝縮器として機能
している室外側熱交換器3の凝縮温度tdが凝縮温度セ
ンサ14によって検出される。When the normal operating state is entered in this manner, the condensing temperature td of the outdoor heat exchanger 3 functioning as a condenser is detected by the condensing temperature sensor 14.
そして、室外制御部9によってこの検出温度tdと第6
図に示すように予め設定された下膜定温度td2とを比
較させ、
td≦td2
に達したことが検出された時点で室外ファン6のファン
モータを高速運転状態から低速運転状態に切換え操作さ
せる。このように室外ファン6のファンモータを低速運
転状態に切換え操作させると室外側熱交換器3の凝縮温
度tdが徐々に上昇し、この凝縮温度tdの上昇にとも
ない蒸発圧力が徐々に上昇するので、蒸発器として機能
する室内側熱交換器4の凍結を防止することができる。The outdoor control unit 9 then sets this detected temperature td and the sixth
As shown in the figure, the lower membrane constant temperature td2 set in advance is compared, and when it is detected that td≦td2 is reached, the fan motor of the outdoor fan 6 is operated to switch from a high speed operation state to a low speed operation state. . When the fan motor of the outdoor fan 6 is switched to a low speed operating state in this way, the condensing temperature td of the outdoor heat exchanger 3 gradually increases, and as the condensing temperature td increases, the evaporation pressure gradually increases. , it is possible to prevent the indoor heat exchanger 4 functioning as an evaporator from freezing.
さらに、外気温度が上昇し、室外制御部9によって室外
側熱交換器3の凝縮温度tdが予め設定された上膜定温
度td、に対して
td≧td。Furthermore, the outside air temperature rises, and the condensation temperature td of the outdoor heat exchanger 3 is td≧td with respect to the upper film constant temperature td set in advance by the outdoor control unit 9.
に達したことが検出された時点で室外ファン6のファン
モータを低速運転状態から高速運転状態に切換え操作さ
せ、凝縮圧力の異常上昇を防止するようにしている。When it is detected that the condensing pressure has reached 1, the fan motor of the outdoor fan 6 is switched from a low speed operating state to a high speed operating state to prevent an abnormal increase in condensing pressure.
したがって、この場合には冷房運転の開始時には圧縮機
1をオン操作すると同時に室外ファン6のファンモータ
を高速運転状態で駆動させる始動制御運転を一定時間行
なわせているので、冷房運転の開始時等の過渡期に室外
側熱交換器3の凝縮温度tdが下膜定温度td2以下で
あることか検出され、室外ファン6のファンモータが低
速運転状態で駆動されることを防止することができる。Therefore, in this case, at the start of cooling operation, the compressor 1 is turned on, and at the same time, a start control operation is performed for a certain period of time in which the fan motor of the outdoor fan 6 is driven at high speed. During the transition period, it is detected whether the condensing temperature td of the outdoor heat exchanger 3 is lower than the lower film constant temperature td2, and it is possible to prevent the fan motor of the outdoor fan 6 from being driven at a low speed.
そのため、冷房運転中の室外ファン6のファンモータの
低速運転範囲を縮小することができ、冷房能力の低下を
防止することができる。Therefore, the low speed operating range of the fan motor of the outdoor fan 6 during cooling operation can be reduced, and a decrease in cooling capacity can be prevented.
なお、上記実施例では室外側熱交換器3の凝縮温度td
を検出し、この検出凝縮温度tdにもとづいて室外ファ
ン6のファンモータの運転速度を制御する構成にした場
合について示したが、圧力センサによって室外側熱交換
器3の凝縮圧力を検出させ、この検出凝縮圧力にもとづ
いて室外ファン6のファンモータの運転速度を制御する
構成にしてもよい。In addition, in the above embodiment, the condensing temperature td of the outdoor heat exchanger 3
In the above example, the operating speed of the fan motor of the outdoor fan 6 is controlled based on the detected condensing temperature td. The configuration may be such that the operating speed of the fan motor of the outdoor fan 6 is controlled based on the detected condensation pressure.
なお、この発明は上記実施例に限定されるものではなく
、この発明の要旨を逸脱しない範囲で種々変形実施でき
ることは勿論である。It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.
[発明の効果コ
この発明によれば能力可変圧縮機の運転周波数に応じて
室外ファンの回転速度切換え用の設定温度を可変する設
定温度可変手段を設けたので、能力可変圧縮機の運転周
波数が低い場合に室外温度が高い状態で室外ファンの回
転数が低速回転状態に切換え操作されることを防止する
ことができ、消費エネルギーを低減し、運転効率の向上
を図ることができる。[Effects of the Invention] According to the present invention, since the set temperature variable means for varying the set temperature for switching the rotational speed of the outdoor fan according to the operating frequency of the variable capacity compressor is provided, the operating frequency of the variable capacity compressor can be changed. When the outdoor temperature is low, it is possible to prevent the rotation speed of the outdoor fan from being switched to a low speed rotation state when the outdoor temperature is high, thereby reducing energy consumption and improving operating efficiency.
図面はこの発明の一実施例を示すもので、第1図は空気
調和機の冷凍サイクルおよび制御回路を示す概略構成図
、第2図は外気温度に対する室外ファンの制御特性を示
す特性図、第3図は圧縮機の運転周波数と室外ファンの
回転速度切換え用の設定温度の変化状態とを示す特性図
、第4図は圧縮機の運転周波数と室外ファンの回転数と
の関係を示す特性図、第5図は冷房運転時の室外ファン
の回転数の制御状態を示すフローチャート、第6図は外
気温度と凝縮温度、蒸発圧力、冷房能力との関係を示す
動作特性図である。
1・・・能力可変圧縮機、3・・・室外側熱交換器、6
・・・室外ファン、8・・・室内制御部、9・・・室外
制御部、13・・・インバータ回路、14・・・凝縮温
度センサ。
出願人代理人 弁理士 鈴江武彦
第2図 第3図
fa fb fc fd Hz厘転n徨駁
第4図The drawings show one embodiment of the present invention, and FIG. 1 is a schematic configuration diagram showing the refrigeration cycle and control circuit of an air conditioner, FIG. 2 is a characteristic diagram showing the control characteristics of the outdoor fan with respect to outside air temperature, and FIG. Figure 3 is a characteristic diagram showing the changing state of the operating frequency of the compressor and the set temperature for switching the rotational speed of the outdoor fan, and Figure 4 is a characteristic diagram showing the relationship between the operating frequency of the compressor and the rotational speed of the outdoor fan. , FIG. 5 is a flowchart showing the control state of the rotation speed of the outdoor fan during cooling operation, and FIG. 6 is an operating characteristic diagram showing the relationship between outside air temperature, condensation temperature, evaporation pressure, and cooling capacity. 1... variable capacity compressor, 3... outdoor heat exchanger, 6
... Outdoor fan, 8... Indoor control section, 9... Outdoor control section, 13... Inverter circuit, 14... Condensation temperature sensor. Applicant's agent Patent attorney Takehiko Suzue Figure 2 Figure 3 fa fb fc fd Hz Rintenn Tokue Figure 4
Claims (1)
室外側熱交換器の凝縮温度を検出し、この検出凝縮温度
に応じて室外ファンの回転速度を可変して前記室外側熱
交換器の凝縮圧力を制御する空気調和機において、前記
能力可変圧縮機の運転周波数に応じて前記室外ファンの
回転速度切換え用の設定温度を可変する設定温度可変手
段を設けたことを特徴とする空気調和機。During cooling operation of an air conditioner equipped with a variable capacity compressor, the condensing temperature of the outdoor heat exchanger is detected, and the rotational speed of the outdoor fan is varied according to the detected condensing temperature. An air conditioner for controlling condensing pressure, characterized in that the air conditioner is provided with a set temperature variable means for varying the set temperature for switching the rotational speed of the outdoor fan according to the operating frequency of the variable capacity compressor. .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63141775A JPH01312345A (en) | 1988-06-10 | 1988-06-10 | Air conditioner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63141775A JPH01312345A (en) | 1988-06-10 | 1988-06-10 | Air conditioner |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01312345A true JPH01312345A (en) | 1989-12-18 |
Family
ID=15299887
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63141775A Pending JPH01312345A (en) | 1988-06-10 | 1988-06-10 | Air conditioner |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01312345A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007322038A (en) * | 2006-05-31 | 2007-12-13 | Hitachi Appliances Inc | Air conditioner |
CN103216911A (en) * | 2013-04-10 | 2013-07-24 | 广东美的制冷设备有限公司 | Inverter air conditioner and energy-saving operation control method thereof |
JP2016090144A (en) * | 2014-11-05 | 2016-05-23 | 三菱電機株式会社 | Air conditioner |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60239270A (en) * | 1984-05-14 | 1985-11-28 | Fujitsu Ltd | Controlling system for printing line number |
JPS61110576A (en) * | 1984-11-05 | 1986-05-28 | Mitsubishi Electric Corp | Electronic typewriter |
JPH01165443A (en) * | 1987-12-22 | 1989-06-29 | Ricoh Co Ltd | Printer |
-
1988
- 1988-06-10 JP JP63141775A patent/JPH01312345A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60239270A (en) * | 1984-05-14 | 1985-11-28 | Fujitsu Ltd | Controlling system for printing line number |
JPS61110576A (en) * | 1984-11-05 | 1986-05-28 | Mitsubishi Electric Corp | Electronic typewriter |
JPH01165443A (en) * | 1987-12-22 | 1989-06-29 | Ricoh Co Ltd | Printer |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007322038A (en) * | 2006-05-31 | 2007-12-13 | Hitachi Appliances Inc | Air conditioner |
EP1862745A3 (en) * | 2006-05-31 | 2008-01-02 | Hitachi Appliances, Inc. | Air conditioner |
CN103216911A (en) * | 2013-04-10 | 2013-07-24 | 广东美的制冷设备有限公司 | Inverter air conditioner and energy-saving operation control method thereof |
JP2016090144A (en) * | 2014-11-05 | 2016-05-23 | 三菱電機株式会社 | Air conditioner |
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