JP2698157B2 - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JP2698157B2 JP2698157B2 JP1083116A JP8311689A JP2698157B2 JP 2698157 B2 JP2698157 B2 JP 2698157B2 JP 1083116 A JP1083116 A JP 1083116A JP 8311689 A JP8311689 A JP 8311689A JP 2698157 B2 JP2698157 B2 JP 2698157B2
- Authority
- JP
- Japan
- Prior art keywords
- electric expansion
- valve opening
- valve
- heat exchanger
- expansion valve
- 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.)
- Expired - Fee Related
Links
Landscapes
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Description
【発明の詳細な説明】 （イ）産業上の利用分野 本発明は１台の室外ユニットに複数台の室内ユニット
を分岐接続した多室型の空気調和機に関する。The present invention relates to a multi-room air conditioner in which a plurality of indoor units are branched and connected to one outdoor unit.
（ロ）従来の技術 室外ユニットから複数台の室内ユニットへ分配される
冷媒の流量制御を電気式膨張弁で行なうようにした多室
型の空気調和機が特公昭63−3229号公報で提示されてい
る。(B) Conventional technology A multi-room air conditioner in which the flow rate of refrigerant distributed from an outdoor unit to a plurality of indoor units is controlled by an electric expansion valve is disclosed in Japanese Patent Publication No. 63-3229. ing.
（ハ）発明が解決しようとする課題 多室型の空気調和機では各室内ユニットの室内熱交換
器へ均等に冷媒を分配する必要があるが、各室内ユニッ
トのユニット間配管の長さが異なったり、各室内ユニッ
トの据付け高さに高低差があったり、各室内ユニットの
室内熱交換器の容量が異なったり、各室内ユニットのフ
ァンの風速が異なる等の理由により、各室内ユニットへ
冷媒が均一に分配されないのが一般的である。(C) Problems to be Solved by the Invention In a multi-room air conditioner, it is necessary to distribute the refrigerant evenly to the indoor heat exchangers in each indoor unit, but the length of the piping between the units in each indoor unit differs. Refrigerant due to the installation height of each indoor unit, the capacity of the indoor heat exchanger of each indoor unit is different, or the wind speed of the fan of each indoor unit is different. It is common that they are not evenly distributed.
このため、上記公報で提示されているように各室内ユ
ニットに電気式膨張弁を組み込んで分配不良をなくすよ
うにするには、各室内熱交換器の冷媒出口温度を検知し
冷媒流量が多い室内ユニットの電気式膨張弁の開度を絞
るように制御すれば良いが、絞り量が限界値を超すとそ
の室内ユニットの室内熱交換器がほとんど流れなくなっ
てしまう為、絞り限界値を設けておく必要がある。又、
分配不良が生じた場合には冷媒流量の少ない電気式膨張
弁を開くように制御すれば良いが、この制御は電気的に
複雑になり好ましくない。For this reason, as disclosed in the above publication, in order to eliminate the distribution failure by incorporating an electric expansion valve in each indoor unit, it is necessary to detect the refrigerant outlet temperature of each indoor heat exchanger, It may be controlled so as to reduce the opening of the electric expansion valve of the unit, but if the amount of restriction exceeds the limit value, the indoor heat exchanger of that indoor unit will hardly flow, so a restriction limit value is provided. There is a need. or,
If a distribution failure occurs, control may be performed to open the electric expansion valve with a small refrigerant flow rate, but this control is electrically complicated and is not preferable.
本発明はかかる課題を解決した空気調和機を提供する
ものである。The present invention provides an air conditioner that solves such a problem.
（ニ）課題を解決するための手段 本発明は分岐した液管に夫々電気式膨張弁を設けた多
室型の空気調和機において、少なくとも１個の電気式膨
張弁の弁開度が絞り限界値に達した時に全ての電気式膨
張弁を略同じ弁開度だけ所定時間開ける制御手段を設け
るようにしたものである。(D) Means for Solving the Problems The present invention relates to a multi-chamber air conditioner in which an electric expansion valve is provided in each of branched liquid pipes, and a valve opening of at least one electric expansion valve is limited to a throttle limit. A control means is provided for opening all the electric expansion valves by substantially the same valve opening for a predetermined time when the value reaches the value.
（ホ）作 用 各室内熱交換器の冷媒出口温度を検出して、冷房時で
は検出温度の最大値を、暖房時では検出温度の最小値を
探し、冷房時では最大温度となっている室内ユニット以
外の室内ユニットの電気式膨張弁を、又、暖房時では最
小温度となっている室内ユニット以外の室内ユニットの
電気式膨張弁を、この室内ユニットの室内熱交換器の冷
媒出口温度が最大もしくは最小の温度になるように絞
る。この絞り量が冷媒流量特性の劣る限界値に達する
と、全ての電気式膨張弁を略同じ弁開度だけ所定時間開
けることにより、各電気式膨張弁は弁開度比を保ちなが
ら絞り限界値に達した電気式膨張弁の弁開度は冷媒流量
特性の良い許容範囲内へ戻される。そして、再び各室内
熱交換器の冷媒出口温度を検出して各電気式膨張弁の弁
開度が調節され、電気式膨張弁の弁開度が絞り限界値に
再び達すると上述の如く全ての電気式膨張弁の弁開度が
一様にコントロールされ、このコントロールを繰り返す
ことにより各電気式膨張弁の弁開度は許容範囲内に落ち
つき、各室内熱交換器へ冷媒が略均一に分配されるよう
になる。(E) Operation The refrigerant outlet temperature of each indoor heat exchanger is detected to find the maximum value of the detected temperature during cooling, the minimum value of the detected temperature during heating, and the maximum temperature during cooling. The electric expansion valve of the indoor unit other than the unit, and the electric expansion valve of the indoor unit other than the indoor unit which is at the minimum temperature during heating, the refrigerant outlet temperature of the indoor heat exchanger of this indoor unit is the maximum Or squeeze to a minimum temperature. When the throttle amount reaches a limit value inferior to the refrigerant flow characteristic, all the electric expansion valves are opened by substantially the same valve opening for a predetermined period of time, so that each of the electric expansion valves maintains the valve opening ratio while maintaining the throttle limit value. Is reached, the valve opening degree of the electric expansion valve is returned to the acceptable range of the refrigerant flow characteristic. Then, the refrigerant outlet temperature of each indoor heat exchanger is detected again, the valve opening of each electric expansion valve is adjusted, and when the valve opening of the electric expansion valve again reaches the throttle limit value, all of the above-described values are obtained as described above. The valve opening of the electric expansion valve is controlled uniformly, and by repeating this control, the valve opening of each electric expansion valve falls within the allowable range, and the refrigerant is substantially uniformly distributed to each indoor heat exchanger. Become so.
（ヘ）実施例 本発明の実施例を図面に基づいて説明すると、第１図
において、（１）は運転周波数が変わる能力可変型圧縮
機（２）と、四方弁（３）と、室外熱交換器（４）と、
気液分離器（５）とを内蔵した室外ユニット、（6a）
（6b）（6c）は室内熱交換器（7a）（7b）（7c）と、電
動式もしくは熱電式の電気式膨張弁（8a）（8b）（8c）
とを内蔵した室内ユニットで、これら機器はユニット間
配管（９）を介して図示の如く接続されている。(F) Embodiment An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, (1) shows a variable capacity compressor (2) whose operating frequency changes, a four-way valve (3), and an outdoor heat source. Exchanger (4),
Outdoor unit with built-in gas-liquid separator (5), (6a)
(6b) (6c) are indoor heat exchangers (7a) (7b) (7c) and electric or thermoelectric electric expansion valves (8a) (8b) (8c)
These units are connected as shown in the figure via a unit-to-unit piping (9).
（10）は冷房運転時にセンサ（11a）（11b）（11c）
からの検出信号を、暖房運転時にセンサ（12a）（12b）
（12c）からの検出信号を入力して電気式膨張弁（8a）
（8b）（8c）の弁開度を第２図、第３図の如くコントロ
ールする制御手段である。(10) is a sensor (11a) (11b) (11c) during cooling operation
Detection signal from the sensor during heating operation (12a) (12b)
Inputting the detection signal from (12c), the electric expansion valve (8a)
(8b) Control means for controlling the valve opening in (8c) as shown in FIGS.
次に運転動作を説明すると、冷房運転は四方弁（３）
を実線状態に設定することにより、圧縮機（２）から吐
出された冷媒は四方弁（３）−室外熱交換器（４）−電
気式膨張弁（8a）（8b）（8c）−室内熱交換器（7a）
（7b）（7c）−四方弁（３）−気液分離器（５）を順次
経て圧縮機（２）に帰還され、室外熱交換器（４）が凝
縮器として、室内熱交換器（7a）（7b）（7c）が蒸発器
として夫々作用し、室内ユニット（6a）（6b）（6c）が
設けられた各室内が同時に冷房される。Next, the operation will be described. The cooling operation is performed by a four-way valve (3).
Is set to a solid line state, the refrigerant discharged from the compressor (2) receives the four-way valve (3)-the outdoor heat exchanger (4)-the electric expansion valves (8a) (8b) (8c)-the indoor heat. Exchanger (7a)
(7b) (7c) -the four-way valve (3) -the gas-liquid separator (5), which is returned to the compressor (2) in order, and the outdoor heat exchanger (4) serves as a condenser, ) (7b) and (7c) function as evaporators, respectively, and the rooms provided with the indoor units (6a), (6b) and (6c) are simultaneously cooled.
かかる冷房運転時において、センサ（11a）（11b）
（11c）で各室内熱交換器（7a）（7b）（7c）の冷媒出
口温度（T1）を検出し、例えばセンサ（11b）の検出温
度が最大値である場合は制御手段（10）からの信号によ
りこの温度（T1）最大値以外の室内ユニット（6b）の電
気式膨張弁（8a）（8c）が絞られる（第３図の（イ）領
域）。そして、例えば電気式膨張弁（8c）の絞り量が冷
媒流量特性の劣る絞り限界値に達すると、制御手段（1
0）からの信号により全ての電気式膨張弁（8a）（8b）
（8c）が略同じ弁開度だけ所定時間（例えば30秒〜１
分）開けられる（第３図の（ロ）領域）。このように各
電気式膨張弁（8a）（8b）（8c）は第３図の（ロ）領域
にさしかかった時の弁開度比を保ちながら絞り限界値に
達した電気式膨張弁（8c）の弁開度は冷媒流量特性の良
い許容範囲内へ戻される。そして、再び各室内熱交換器
（7a）（7b）（7c）の冷媒出口温度（T1）を検出して各
電気式膨張弁（8a）（8b）（8c）の弁開度が調節され
（第３図の（ハ）領域）、電気式膨張弁（8c）の弁開度
が絞り限界値に再び達すると制御手段（10）からの信号
により全ての電気式膨張弁（8a）（8b）（8c）が再び略
同じ弁開度だけ所定時間（例えば30秒〜１分）開けられ
る（第３図の（ニ）領域）。このように各電気式膨張弁
（8a）（8b）（8c）は第３図の（ニ）領域にさしかかっ
た時の弁開度比を保ちながら絞り限界値に達した電気式
膨張弁（8c）の弁開度は冷媒流量特性の良い許容範囲内
へ再び戻される。このようにして電気式膨張弁（8a）
（8b）（8c）は弁開度が一様にコントロールされ、この
コントロールを繰り返すことにより各電気式膨張弁（8
a）（8b）（8c）の弁開度は許容範囲内に落ちつき（第
３図の（ホ）領域）、各室内熱交換器（7a）（7b）（7
c）へ冷媒が略均一に分配されるようになる。During such cooling operation, the sensors (11a) and (11b)
In (11c), the refrigerant outlet temperature (T 1 ) of each indoor heat exchanger (7a) (7b) (7c) is detected. For example, if the detected temperature of the sensor (11b) is the maximum value, the control means (10) The electric expansion valves (8a) and (8c) of the indoor unit (6b) other than the maximum value of the temperature (T 1 ) are throttled by the signal from the controller (area (a) in FIG. 3). Then, for example, when the throttle amount of the electric expansion valve (8c) reaches a throttle limit value inferior in refrigerant flow characteristics, the control means (1
All electric expansion valves (8a) (8b) by the signal from 0)
(8c) for a predetermined time (for example, 30 seconds to 1
Minutes) can be opened ((b) area in FIG. 3). As described above, each of the electric expansion valves (8a), (8b), and (8c) maintains the valve opening ratio when approaching the region (b) of FIG. The valve opening degree is returned to the allowable range where the refrigerant flow characteristic is good. Then, the refrigerant outlet temperature (T 1 ) of each indoor heat exchanger (7a) (7b) (7c) is detected again, and the valve opening of each electric expansion valve (8a) (8b) (8c) is adjusted. When the valve opening of the electric expansion valve (8c) again reaches the throttle limit value (region (c) in FIG. 3), all the electric expansion valves (8a) (8b ) (8c) is opened again by the same degree of valve opening for a predetermined time (for example, 30 seconds to 1 minute) (region (d) in FIG. 3). Thus, each of the electric expansion valves (8a), (8b) and (8c) maintains the valve opening ratio when approaching the region (d) of FIG. The valve opening degree is returned again within the acceptable range of the refrigerant flow characteristic. Thus, the electric expansion valve (8a)
In (8b) and (8c), the valve opening is controlled uniformly, and by repeating this control, each electric expansion valve (8
a) The valve opening of (8b) and (8c) settled within the allowable range (region (e) in FIG. 3), and the indoor heat exchangers (7a) (7b) (7
The refrigerant is distributed substantially uniformly to c).
又、暖房運転は四方弁（３）を破線状態に設定するこ
とにより、圧縮機（２）から吐出された冷媒は四方弁
（３）−室内熱交換器（7a）（7b）（7c）−電気式膨張
弁（8a）（8b）（8c）−室外熱交換器（４）−四方弁
（３）−気液分離器（５）を順次経て圧縮機（２）に帰
還され、室内熱交換器（7a）（7b）（7c）が凝縮器とし
て、室外熱交換器（４）が蒸発器として夫々作用し、室
内ユニット（6a）（6b）（6c）が設けられた各室内が同
時に暖房される。Also, in the heating operation, the refrigerant discharged from the compressor (2) is set in the four-way valve (3) —the indoor heat exchangers (7a) (7b) (7c) —by setting the four-way valve (3) to the broken line state. Electric expansion valves (8a) (8b) (8c)-outdoor heat exchanger (4)-four-way valve (3)-return to compressor (2) through gas-liquid separator (5) in order, and indoor heat exchange The units (7a), (7b) and (7c) act as condensers, and the outdoor heat exchanger (4) acts as an evaporator. Each room equipped with indoor units (6a) (6b) (6c) is heated simultaneously. Is done.
かかる暖房運転時において、センサ（12a）（12b）
（12c）で各室内熱交換器（7a）（7b）（7c）の冷媒出
口温度（T2）を検出し、例えばセンサ（12b）の検出温
度が最小値である場合は制御手段（10）からの信号によ
りこの温度（T2）最小値以外の室内ユニット（6b）の電
気式膨張弁（8a）（8c）が絞られる（第３図の（イ）領
域）。そして、例えば電気式膨張弁（8c）の絞り量が冷
媒流量特性の劣る絞り限界値に達すると、制御手段（1
0）からの信号により全ての電気式膨張弁（8a）（8b）
（8c）が略同じ弁開度だけ所定時間（例えば30秒〜１
分）開けられる（第３図の（ロ）領域）。このように各
電気式膨張弁（8a）（8b）（8c）は第３図の（ロ）領域
にさしかかった時の弁開度を保ちながら絞り限界値に達
した電気式膨張弁（8c）の弁開度は冷媒流量特性の良い
許容範囲内へ戻される。そして、再び各室内熱交換器
（7a）（7b）（7c）の冷媒出口温度（T2）を検出して各
電気式膨張弁（8a）（8b）（8c）の弁開度が調節され
（第３図の（ハ）領域）、電気式膨張弁（8c）の弁開度
を絞り限界値に再び達すると制御手段（10）からの信号
により全ての電気式膨張弁（8a）（8b）（8c）が再び略
同じ弁開度だけ所定時間（例えば30秒〜１分）開けられ
る（第３図の（ニ）領域）。このように各電気式膨張弁
（8a）（8b）（8c）は第３図の（ニ）領域にさしかかっ
た時の弁開度比を保ちながら絞り限界値に達した電気式
膨張弁（8c）の弁開度は冷媒流量特性の良い許容範囲以
内へ再び戻される。このようにして電気式膨張弁（8a）
（8b）（8c）は弁開度が一様にコントロールされ、この
コントロールを繰り返すことにより各電気式膨張弁（8
a）（8b）（8c）の弁開度は許容範囲内に落ちつき（第
３図の（ホ）領域）、各室内熱交換器（7a）（7b）（7
c）へ冷媒が略均一に分配されるようになる。During the heating operation, the sensors (12a) and (12b)
In (12c), the refrigerant outlet temperature (T 2 ) of each indoor heat exchanger (7a) (7b) (7c) is detected. For example, if the detected temperature of the sensor (12b) is the minimum value, the control means (10) The electric expansion valves (8a) and (8c) of the indoor unit (6b) other than the temperature (T 2 ) minimum value are throttled according to the signal from (1) (area (a) in FIG. 3). Then, for example, when the throttle amount of the electric expansion valve (8c) reaches a throttle limit value inferior in refrigerant flow characteristics, the control means (1
All electric expansion valves (8a) (8b) by the signal from 0)
(8c) for a predetermined time (for example, 30 seconds to 1
Minutes) can be opened ((b) area in FIG. 3). Thus, each of the electric expansion valves (8a), (8b), and (8c) reaches the throttle limit value while maintaining the valve opening when approaching the region (b) in FIG. 3 (8c). Is returned to within a good allowable range of the refrigerant flow characteristic. Then, the refrigerant outlet temperature (T 2 ) of each indoor heat exchanger (7a) (7b) (7c) is detected again, and the valve opening of each electric expansion valve (8a) (8b) (8c) is adjusted. When the valve opening of the electric expansion valve (8c) again reaches the throttle limit value (region (c) in FIG. 3), all the electric expansion valves (8a) (8b ) (8c) is opened again by the same degree of valve opening for a predetermined time (for example, 30 seconds to 1 minute) (region (d) in FIG. 3). Thus, each of the electric expansion valves (8a), (8b) and (8c) maintains the valve opening ratio when approaching the region (d) of FIG. The valve opening degree is returned again within the allowable range of the refrigerant flow characteristic. Thus, the electric expansion valve (8a)
In (8b) and (8c), the valve opening is controlled uniformly, and by repeating this control, each electric expansion valve (8
a) The valve opening of (8b) and (8c) settled within the allowable range (region (e) in FIG. 3), and the indoor heat exchangers (7a) (7b) (7
The refrigerant is distributed substantially uniformly to c).
尚、上記実施例では電気式膨張弁（8a）（8b）（8c）
を夫々室内ユニット（6a）（6b）（6c）に内蔵したが、
分岐した液管（13a）（13b）（13c）に設ければ内蔵し
なくても良い。In the above embodiment, the electric expansion valves (8a) (8b) (8c)
Were built into the indoor units (6a), (6b), and (6c), respectively.
If it is provided in the branched liquid pipes (13a), (13b), and (13c), it may not be built-in.
（ト）発明の効果 本発明によれば、複数台の室内ユニットが冷暖房運転
されている時に冷媒分配不良が生じ、これに伴なって複
数個の電気式膨張弁のうちの少なくとも１個の電気式膨
張弁の弁開度が絞り限界値に達した時には制御手段から
の信号により全ての電気式膨張弁を略同じ弁開度だけ所
定時間開けるようにしたので、各電気式膨張弁は弁開度
比を保ちながら絞り限界値に達した電気式膨張弁の弁開
度は冷媒流量特性の良い許容範囲内へ戻され、これを繰
り返すことにより各電気式膨張弁の弁開度が許容範囲内
に落ちつき、各室内熱交換器へ冷媒を略均一に分配させ
ることができる。(G) Advantageous Effects of the Invention According to the present invention, refrigerant distribution failure occurs when a plurality of indoor units are in a cooling / heating operation, and at least one of the plurality of electric expansion valves is electrically operated. When the valve opening of the type expansion valve reaches the throttle limit value, all the electric expansion valves are opened by the signal from the control means by substantially the same valve opening for a predetermined period of time. The valve opening of the electric expansion valve that has reached the throttle limit value while maintaining the degree ratio is returned to the allowable range with good refrigerant flow characteristics, and by repeating this, the valve opening of each electric expansion valve is within the allowable range. And the refrigerant can be distributed substantially uniformly to each indoor heat exchanger.
図面は本発明の実施例を示すもので、第１図は空気調和
機の冷媒回路図、第２図は電気式膨張弁の制御動作を示
すフローチャート、第３図は電気式膨張弁の弁開度を示
す説明図である。 （１）……室外ユニット、（２）……圧縮機、（４）…
…室外熱交換器、（6a）（6b）（6c）……室内ユニッ
ト、（7a）（7b）（7c）……室内熱交換器、（8a）（8
b）（8c）……電気式膨張弁、（10）……制御手段。The drawings show an embodiment of the present invention. FIG. 1 is a refrigerant circuit diagram of an air conditioner, FIG. 2 is a flowchart showing a control operation of an electric expansion valve, and FIG. It is explanatory drawing which shows a degree. (1) Outdoor unit (2) Compressor (4)
... outdoor heat exchanger, (6a) (6b) (6c) ... indoor unit, (7a) (7b) (7c) ... indoor heat exchanger, (8a) (8
b) (8c): Electric expansion valve, (10): Control means.
Claims (1)
ットに、室内熱交換器を有する複数台の室内ユニットを
分岐接続し、この分岐した液管に夫々電気式膨張弁を設
けた空気調和機において、少なくとも一個の電気式膨張
弁の弁開度が絞り限界値に達した時に全ての電気式膨張
弁を略同じ弁開度だけ所定時間開ける制御手段を備えた
ことを特徴とする空気調和機。An air in which a plurality of indoor units having an indoor heat exchanger are branched and connected to an outdoor unit having a compressor and an outdoor heat exchanger, and each of the branched liquid pipes is provided with an electric expansion valve. The air conditioner according to claim 1, further comprising control means for opening all the electric expansion valves by substantially the same valve opening for a predetermined time when the valve opening of at least one electric expansion valve reaches a throttle limit value. Harmony machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1083116A JP2698157B2 (en) | 1989-03-31 | 1989-03-31 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1083116A JP2698157B2 (en) | 1989-03-31 | 1989-03-31 | Air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02263065A JPH02263065A (en) | 1990-10-25 |
| JP2698157B2 true JP2698157B2 (en) | 1998-01-19 |
Family
ID=13793231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1083116A Expired - Fee Related JP2698157B2 (en) | 1989-03-31 | 1989-03-31 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2698157B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104132432B (en) * | 2014-08-22 | 2016-06-29 | 四川长虹空调有限公司 | The approximant control method of electric expansion valve |
| CN111878962A (en) * | 2020-06-28 | 2020-11-03 | 青岛海尔空调电子有限公司 | Control method of air conditioning system |
-
1989
- 1989-03-31 JP JP1083116A patent/JP2698157B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02263065A (en) | 1990-10-25 |
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| LAPS | Cancellation because of no payment of annual fees |