JPS6387560A - Operation controller for air conditioner - Google Patents
Operation controller for air conditionerInfo
- Publication number
- JPS6387560A JPS6387560A JP22992386A JP22992386A JPS6387560A JP S6387560 A JPS6387560 A JP S6387560A JP 22992386 A JP22992386 A JP 22992386A JP 22992386 A JP22992386 A JP 22992386A JP S6387560 A JPS6387560 A JP S6387560A
- Authority
- JP
- Japan
- Prior art keywords
- heat exchanger
- air conditioning
- refrigerant
- indoor heat
- compressor
- 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
- 238000004378 air conditioning Methods 0.000 claims description 31
- 239000003507 refrigerant Substances 0.000 claims description 31
- 238000005057 refrigeration Methods 0.000 claims description 18
- 230000005856 abnormality Effects 0.000 claims description 5
- 238000001816 cooling Methods 0.000 description 20
- 238000002485 combustion reaction Methods 0.000 description 14
- 230000002159 abnormal effect Effects 0.000 description 11
- 239000003638 chemical reducing agent Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Landscapes
- Air Conditioning Control Device (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
この発明は空気調和設備の運転制御装置に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) This invention relates to an operation control device for air conditioning equipment.
（従来の技術）
空気調和設備において、コンプレッサと、室外側熱交換
器と、室内側熱交換器と、これら間を連結する冷媒の流
路とを有する冷凍サイクルが複数結膜けられ、それぞれ
の室内側熱交換器により、対応する領域の空気調和を行
なうように構成されている空気調和設備は公知であシ、
この種の空気調和設備では、通常複数路の冷凍サイクル
のコンプレッサが共通の駆動源、例えば−台のモータ又
は内燃機関で駆動される方式となっている。この方式の
空気調和設備の運転制御については、例えば、特開昭５
８−２１３１６１号公報に開示されており、室内空気温
度検知器と冷媒温度或は冷媒圧力を検知するコンプレッ
サの過負荷検知器が具備されている。そして室内空気温
度検知器で検出される室内空気温度の設定基準温度との
温度差に対応させて、回転数制御装置によって駆動源で
ある内燃機関の回転数を制御し、最高回転数で運転され
ている場合で、過負荷検知器が作動した場合には、所定
の回転数に内燃機関の回転数を低下させるような制御を
行なっている。しかし、このような制御方式では、複数
路の冷凍サイクルの一つの系での冷暖房条件の異常を検
出すると、共通の駆動源の作動条件を変化させるため、
他の冷凍サイクルの冷暖房条件を変化させてしまうとい
う欠陥がある。(Prior Art) In an air conditioning system, a plurality of refrigeration cycles each having a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a refrigerant flow path connecting these are connected to each other. Air conditioning equipment configured to condition the air in a corresponding area by means of an internal heat exchanger is known;
In this type of air conditioning equipment, the compressors of the multiple-path refrigeration cycle are usually driven by a common drive source, for example, two motors or an internal combustion engine. Regarding the operation control of air conditioning equipment using this method, for example,
This system is disclosed in Japanese Patent No. 8-213161 and is equipped with an indoor air temperature detector and a compressor overload detector that detects refrigerant temperature or refrigerant pressure. Then, the rotation speed control device controls the rotation speed of the internal combustion engine, which is the drive source, in response to the temperature difference between the indoor air temperature detected by the indoor air temperature sensor and the set reference temperature, so that it is operated at the maximum rotation speed. If the overload detector is activated, control is performed to reduce the rotational speed of the internal combustion engine to a predetermined rotational speed. However, with this type of control method, when an abnormality in the heating and cooling conditions is detected in one system of a multi-path refrigeration cycle, the operating conditions of the common drive source are changed.
It has a defect in that it changes the heating and cooling conditions of other refrigeration cycles.
（発明が解決しようとする問題点）
上記のとおり、特開昭５８−２１３１６１号公報に開示
されているような従来の制御方式では、複数路の冷凍サ
イクルの一つに空気調和の異常が検出されると、駆動源
の作動条件が変化させられるために、他の冷凍サイクル
の空気調和状態が変化し快適な空気調和条件が得られな
い。(Problems to be Solved by the Invention) As mentioned above, in the conventional control method as disclosed in Japanese Patent Application Laid-Open No. 58-213161, an abnormality in air conditioning is detected in one of the multiple refrigeration cycles. In this case, since the operating conditions of the drive source are changed, the air conditioning conditions of other refrigeration cycles are changed, and comfortable air conditioning conditions cannot be obtained.
本発明は、従来の制御方式におけるこのような欠陥を避
け、複数路の冷凍サイクルの一つに空気調和の異常が生
じた場合に、その系内のみでの熱交換量を調整すること
で補償し、正常な空気調和循環系に悪影響を及ぼさない
空気調和設備の運転制御装置を提供することを目的とす
る。The present invention avoids such deficiencies in conventional control methods and compensates for air conditioning abnormalities in one of the multiple-path refrigeration cycles by adjusting the amount of heat exchange only within that system. However, it is an object of the present invention to provide an operation control device for air conditioning equipment that does not adversely affect a normal air conditioning circulation system.
（問題点を解決するための手段）
上記の目的を達成するため、本発明の空気調和設備の運
転制御装置においては、コンプレッサと、室外側熱交換
器と、室内側熱交換器と、これら間を連結する冷媒の流
路とを有する冷凍サイクルが複数結膜けられ、それぞれ
の室内側熱交換器によシ対応する領域の空気調和を行な
う空気調和設備において、室外側熱交換器の冷媒が流入
する入力流路に設けられ冷媒の異常を検出するセンナと
、このセンサの出力信号によって対応する室内側熱交換
器の作動能力を変化させる制御手段とが具備された構成
となっている。(Means for Solving the Problems) In order to achieve the above object, in the operation control device for air conditioning equipment of the present invention, the compressor, the outdoor heat exchanger, the indoor heat exchanger, and the In an air conditioning system where multiple refrigeration cycles each having a refrigerant flow path connecting the refrigeration circuits are used to condition the air in the corresponding area, the refrigerant from the outdoor heat exchanger flows into each indoor heat exchanger. The structure includes a sensor that is installed in the input flow path to detect abnormalities in the refrigerant, and a control means that changes the operating capacity of the corresponding indoor heat exchanger based on the output signal of this sensor.
（作用）
上記の構成を有する本発明の装置は、複数路の冷凍サイ
クルのうち、空気調和条件が異常となった系の室内側熱
交換器の熱交換器が制御手段で独立に調整されるので、
他の正常な空気調和条件の冷凍サイクルには何ら影響を
及ぼさずに、空気調和条件が異常となった冷凍サイクル
の空気調和条件を正常状態に復帰させることが出来る。(Function) In the apparatus of the present invention having the above configuration, among the multiple-path refrigeration cycle, the heat exchanger of the indoor heat exchanger of the system in which the air conditioning condition has become abnormal is independently adjusted by the control means. So,
The air conditioning conditions of a refrigeration cycle whose air conditioning conditions have become abnormal can be returned to normal without affecting other refrigeration cycles with normal air conditioning conditions.
（実施例）
以下、本発明の実施例について、第１図及び第２図によ
って詳細に説明する。第１図および第２図に示す実施例
においては、冷房循環系が２路設けられ、それぞれの冷
房循環系のコンプレッサが、共通の駆動源である内燃機
関によって駆動されている。(Example) Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 and 2. In the embodiment shown in FIGS. 1 and 2, two cooling circulation systems are provided, and the compressors of each cooling circulation system are driven by a common driving source, that is, an internal combustion engine.
内燃機関１１の出力軸に第１のコンプレッサ１２の入力
側が接続され、第１のコンプレッサ１２の出力側に第１
の室外側熱交換器１４と第１の減圧器１６と第１の室内
側熱交換器１８とが冷媒の流路によってループ状に直列
に接続されている。第１の室内側熱交換器１８には送風
機２０が設けられ、この送風機２０には送風機制御部２
２の出力端子が接続され、この送風機制御部２２の入力
端子には、第１の室外側熱交換器１４の冷媒が流入する
入力流路に設けられているセンサ２４の出力端子が接続
されている。The input side of the first compressor 12 is connected to the output shaft of the internal combustion engine 11, and the first compressor 12 is connected to the output side of the first compressor 12.
The outdoor heat exchanger 14, the first pressure reducer 16, and the first indoor heat exchanger 18 are connected in series in a loop shape through a refrigerant flow path. The first indoor heat exchanger 18 is provided with a blower 20, and this blower 20 has a blower control unit 2.
The output terminal of the sensor 24 provided in the input flow path into which the refrigerant of the first outdoor heat exchanger 14 flows is connected to the input terminal of the blower control unit 22. There is.
同様にして、内燃機関１１の出力軸に第２のコンプレッ
サ１３の入力側が接続され、第２のコンプレッサ１３の
出力側に第２の室外側熱交換器１５と第２の減圧器１７
と第２の室内側熱交換器１９とが冷媒の流路によってル
ープ状に直列に接続されている。Similarly, the input side of the second compressor 13 is connected to the output shaft of the internal combustion engine 11, and the second outdoor heat exchanger 15 and the second pressure reducer 17 are connected to the output side of the second compressor 13.
and the second indoor heat exchanger 19 are connected in series in a loop through a refrigerant flow path.
第２の室内側熱交換器１９には送風機２１が設けられ、
この送風機２１には送風機制御部２３の出力端子が接続
され、この送風機制御部２３の入力端子には、第２の室
外側熱交換器１５の入力流路に設けられているセンサ２
５の出力端子が接続されている。The second indoor heat exchanger 19 is provided with a blower 21,
An output terminal of a blower control section 23 is connected to this blower 21 , and a sensor 2 provided in the input flow path of the second outdoor heat exchanger 15 is connected to the input terminal of this blower control section 23 .
5 output terminals are connected.
第１のコンプレッサ１２、第１の室外側熱交換器１４、
減圧器１６、第１の室内側熱交換器１８及びこれら間を
連結する冷媒の流路によって第１の冷房循環系が構成さ
れている。a first compressor 12, a first outdoor heat exchanger 14,
A first cooling circulation system is configured by the pressure reducer 16, the first indoor heat exchanger 18, and a refrigerant flow path connecting these.
同様に、第２のコンプレッサ１３、第２の室外側熱交換
器１５、減圧器１７、第２の室内側熱交換器１９及びこ
れら間を連結する冷媒の流路によって第２の冷房循環系
が構成されている。Similarly, a second cooling circulation system is established by the second compressor 13, the second outdoor heat exchanger 15, the pressure reducer 17, the second indoor heat exchanger 19, and the refrigerant flow path connecting these. It is configured.
上記の構成を有する空気調和設備の動作について説明す
ると、例えばフロンガスの如き冷媒が、第１のコンプレ
ッサ内で内燃機関１１の駆動にょシ圧縮され、圧縮され
たガス状の冷媒が冷媒の流路中を第１の室外側熱交換器
１４に送り込まれる。第１の室外側熱交換器１４におい
て、送シ込まれた高温・高圧のガス状の冷媒は空気によ
って冷却され、凝縮液化して液体状となる。液体状の冷
却された冷媒は、減圧器１６で圧力温度と共に下降した
状態とされて、第１の室内側熱交換器１８に供給される
。To explain the operation of the air conditioning equipment having the above configuration, a refrigerant such as fluorocarbon gas is compressed in the first compressor to drive the internal combustion engine 11, and the compressed gaseous refrigerant is introduced into the refrigerant flow path. is fed into the first outdoor heat exchanger 14. In the first outdoor heat exchanger 14, the high-temperature, high-pressure gaseous refrigerant that has been pumped in is cooled by air, condensed, and liquefied into a liquid state. The cooled liquid refrigerant is reduced in pressure and temperature by the pressure reducer 16 and is then supplied to the first indoor heat exchanger 18 .
第１の室内側熱交換器１８において冷媒が低い温度で蒸
発し、室内の空気で加熱されて気化し気化潜熱を空気か
ら奪うために、第１の冷房循環系に対応する室内に対し
て、冷房効果を与える。第１の室内側熱交換器１８の出
力流路では、冷媒はガス状となって第１のコンプレッサ
１２に吸い込まれる。In order for the refrigerant to evaporate at a low temperature in the first indoor heat exchanger 18 and be heated by the indoor air to vaporize and remove latent heat of vaporization from the air, for the indoor room corresponding to the first cooling circulation system, Gives a cooling effect. In the output flow path of the first indoor heat exchanger 18 , the refrigerant is drawn into the first compressor 12 in gaseous form.
このようにして、第１の冷房循環系を冷媒が循環するこ
とによって、第１の冷房循環系に対応する室内に対して
冷房効果が与えられる。In this way, by circulating the refrigerant through the first cooling circulation system, a cooling effect is imparted to the room corresponding to the first cooling circulation system.
かシに第１の冷房循環系の室内外の温度の異常上昇事態
が冷房運転中に発生したとすると、第１の室外側熱交換
器１４の入力流路における冷媒の圧力及び温度がこれに
応じて上昇する。この状態がそのまま放置されると、第
１のコンプレッサ１２の必要仕事量が増加し、遂には内
燃機関１１の出力が不足して内燃機関１１が停止する事
故に到るおそれがあるが、この発明の実施例では、セン
サ２４が設けられていてこのセンサ２４が第１の室外側
熱交換器１４の入力流路における冷媒の圧力或は温度の
異常上昇を検出すると、センサ２４からは異常信号が発
せられ、送風機制御部２２に入力される。異常信号が入
力された送風機制御部２２は、冷媒の圧力或は温度の異
常上昇の度合に対応して、送風機２ｏの風量を低下させ
る。送風機２ｏの風量が低下すると、冷媒の蒸発温度が
下がり、その結果第１の冷房循環系内の冷媒循環量が減
少するので、第１の室外側熱交換器１４の入力流路にお
ける冷媒の圧力或は温度が下がり、内燃機関１１の負荷
が減少するので、内燃機関１１の過負荷停止事故を防止
することが出来る。If an abnormal rise in the indoor and outdoor temperatures of the first cooling circulation system occurs during cooling operation, the pressure and temperature of the refrigerant in the input flow path of the first outdoor heat exchanger 14 will increase accordingly. It will rise accordingly. If this state is left as it is, the amount of work required by the first compressor 12 will increase, and there is a risk that the output of the internal combustion engine 11 will be insufficient and an accident may occur in which the internal combustion engine 11 stops. In the embodiment, a sensor 24 is provided, and when the sensor 24 detects an abnormal increase in the pressure or temperature of the refrigerant in the input flow path of the first outdoor heat exchanger 14, the sensor 24 outputs an abnormal signal. is emitted and input to the blower control section 22. The blower control unit 22 to which the abnormal signal is input reduces the air volume of the blower 2o in accordance with the degree of abnormal rise in refrigerant pressure or temperature. When the air volume of the blower 2o decreases, the evaporation temperature of the refrigerant decreases, and as a result, the amount of refrigerant circulated within the first cooling circulation system decreases, so the pressure of the refrigerant in the input flow path of the first outdoor heat exchanger 14 decreases. Alternatively, since the temperature decreases and the load on the internal combustion engine 11 decreases, an overload stop accident of the internal combustion engine 11 can be prevented.
第２図は横軸に時間を取って示した前述せるような制御
を行なう場合の、冷媒圧力と送風機の風量との関係を示
すもので、冷媒圧力が正常圧力に戻った時点で送風機２
０の風量を通常レベルに戻して空調能力の低下を防止し
ている。Figure 2 shows the relationship between the refrigerant pressure and the airflow rate of the blower when performing the control described above, with time plotted on the horizontal axis.When the refrigerant pressure returns to normal pressure, the blower 2
The air volume at 0 is returned to the normal level to prevent the air conditioning capacity from decreasing.
この制御動作中第２の冷房循環系では、全く独立してこ
の制御動作の影響を受けずに冷房運転が行なわれている
。このようにして、特に複数の冷房循環系のコンプレッ
サが共通の内燃機関で駆動される場合に、異常状態とな
った系のコンプレッサの負荷だけを減少させて内燃機関
の異常停止事故を防止することが出来る。なお、送風機
２０と第１の室内側熱交換器１８との間に風景を調整す
るシャッタを設け、制御手段としてこのシャッタの開度
を変化させる装置を使用した構成とすることも可能であ
る。During this control operation, the second cooling circulation system performs cooling operation completely independently without being affected by this control operation. In this way, especially when the compressors of a plurality of cooling circulation systems are driven by a common internal combustion engine, only the load on the compressor of the system in an abnormal state is reduced to prevent an accident of abnormal stoppage of the internal combustion engine. I can do it. Note that it is also possible to provide a configuration in which a shutter for adjusting the scenery is provided between the blower 20 and the first indoor heat exchanger 18, and a device that changes the opening degree of this shutter is used as the control means.
上記の説明においては、第１の冷房循環系を取シ上げて
説明したが、第２の冷房循環系についても全く同様の動
作が行なわれる。また、本発明は、２路の冷房循環系を
有するものに限らず、３路以上の冷凍サイクルを有する
空気調和設備に対しても適用可能である。In the above description, the first cooling circulation system has been explained, but exactly the same operation is performed for the second cooling circulation system. Further, the present invention is applicable not only to those having a two-way cooling circulation system but also to air conditioning equipment having three or more refrigeration cycles.
（発明の効果）
以上詳細に説明したように、本発明によると、複数路の
冷凍サイクルの内、空気調和条件が異常となった系の室
内側熱交換器の熱交換量を制御手段で独立に調整し、他
の正常な空気調和条件の冷凍サイクル空気調和循環系に
は何ら影響を及ぼさずに、空気調和条件が異常なった冷
凍サイクルの空気調和条件を正常状態に復帰させること
が可能な、空気調和設備の運転制御装置を提供すること
が出来る。(Effects of the Invention) As described in detail above, according to the present invention, the heat exchange amount of the indoor heat exchanger of the system in which the air conditioning condition has become abnormal among the multiple path refrigeration cycles can be independently controlled by the control means. It is possible to restore the air conditioning conditions of a refrigeration cycle whose air conditioning conditions have become abnormal to normal without affecting the air conditioning circulation system of the refrigeration cycle with other normal air conditioning conditions. , it is possible to provide an operation control device for air conditioning equipment.
第１図はこの発明の実施例の構成を示すブロック図、第
２図は制御手段として室内側熱交換器の送風機の回転数
を変化させる装置を用いた場合の冷媒圧力と送風機の風
量との関係を示す図である。
１１・・・内燃機関、 １２・・・第１のコンプレッサ
、１３・・・第２のコンプレッサ、
１４・・・第１の室外側熱交換器、
１５・・・第２の室外側熱交換器、 １６ 、１７・・
・減圧器、１８・・・第１の室内側熱交換器、
１９・・・第２の室内側熱交換器、 ２０ 、２１・・
・送風機、２２ 、２３・・・送風機制御部、 ２
４ 、２５・・・センサ。
代理人 弁理士 鈴 木 秀 雄
第１図Fig. 1 is a block diagram showing the configuration of an embodiment of the present invention, and Fig. 2 shows the relationship between the refrigerant pressure and the air volume of the blower when a device for changing the rotation speed of the blower of the indoor heat exchanger is used as a control means. It is a figure showing a relationship. DESCRIPTION OF SYMBOLS 11... Internal combustion engine, 12... First compressor, 13... Second compressor, 14... First outdoor heat exchanger, 15... Second outdoor heat exchanger , 16 , 17...
- Pressure reducer, 18... first indoor heat exchanger, 19... second indoor heat exchanger, 20, 21...
・Blower, 22, 23...Blower control unit, 2
4, 25...sensor. Agent Patent Attorney Hideo Suzuki Figure 1
Claims (3)
換器と、これら間を連結する冷媒流路とを有する冷凍サ
イクルが複数設けられ、各冷凍サイクルのコンプレッサ
が共通の駆動源で駆動され、それぞれの室内側熱交換器
により、対応する領域の空気調和を行なう空気調和設備
において、それぞれの室外側熱交換器の冷媒が流入する
入力流路に設けられ冷媒の異常を検出するセンサと、セ
ンサの出力信号によつて該室外側熱交換器に対応する室
内側熱交換器の作動能力を変化させる制御手段とを有す
ることを特徴とする空気調和設備の運転制御装置。(1) A plurality of refrigeration cycles each having a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a refrigerant flow path connecting these are provided, and the compressor of each refrigeration cycle is driven by a common drive source. In the air conditioning equipment where each indoor heat exchanger performs air conditioning in the corresponding area, a sensor is installed in the input flow path into which the refrigerant of each outdoor heat exchanger flows to detect abnormalities in the refrigerant. 1. An operation control device for air conditioning equipment, comprising: a control means for changing the operating capacity of an indoor heat exchanger corresponding to the outdoor heat exchanger according to an output signal of a sensor.
変化させる装置であることを特徴とする、特許請求の範
囲第１項記載の空気調和設備の運転制御装置。(2) The operation control device for air conditioning equipment according to claim 1, wherein the control means is a device that changes the rotation speed of a blower of an indoor heat exchanger.
変化させる装置であることを特徴とする、特許請求の範
囲第１項記載の空気調和設備の運転制御装置。(3) The operation control device for air conditioning equipment according to claim 1, wherein the control means is a device that changes the opening degree of a shutter of an indoor heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22992386A JPS6387560A (en) | 1986-09-30 | 1986-09-30 | Operation controller for air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22992386A JPS6387560A (en) | 1986-09-30 | 1986-09-30 | Operation controller for air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6387560A true JPS6387560A (en) | 1988-04-18 |
Family
ID=16899857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22992386A Pending JPS6387560A (en) | 1986-09-30 | 1986-09-30 | Operation controller for air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6387560A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007183077A (en) * | 2006-01-10 | 2007-07-19 | Ebara Corp | Refrigerating device |
| JP2008256365A (en) * | 2007-03-30 | 2008-10-23 | Morinaga Milk Ind Co Ltd | Scanning device of coagulation detection sensor, and scanning method using the same |
| JP2011085267A (en) * | 2009-10-13 | 2011-04-28 | Ntt Facilities Inc | Air conditioning control system and method of operating the same |
| WO2012020752A1 (en) * | 2010-08-10 | 2012-02-16 | 株式会社日立プラントテクノロジー | Apparatus for operation of cooling system in abnormal state |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5223754B2 (en) * | 1972-08-09 | 1977-06-27 |
-
1986
- 1986-09-30 JP JP22992386A patent/JPS6387560A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5223754B2 (en) * | 1972-08-09 | 1977-06-27 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007183077A (en) * | 2006-01-10 | 2007-07-19 | Ebara Corp | Refrigerating device |
| JP2008256365A (en) * | 2007-03-30 | 2008-10-23 | Morinaga Milk Ind Co Ltd | Scanning device of coagulation detection sensor, and scanning method using the same |
| JP2011085267A (en) * | 2009-10-13 | 2011-04-28 | Ntt Facilities Inc | Air conditioning control system and method of operating the same |
| WO2012020752A1 (en) * | 2010-08-10 | 2012-02-16 | 株式会社日立プラントテクノロジー | Apparatus for operation of cooling system in abnormal state |
| JP2012037185A (en) * | 2010-08-10 | 2012-02-23 | Hitachi Plant Technologies Ltd | Apparatus for operation of cooling system in abnormal state |
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