JPH0454858B2 - - Google Patents
Info
- Publication number
- JPH0454858B2 JPH0454858B2 JP60258003A JP25800385A JPH0454858B2 JP H0454858 B2 JPH0454858 B2 JP H0454858B2 JP 60258003 A JP60258003 A JP 60258003A JP 25800385 A JP25800385 A JP 25800385A JP H0454858 B2 JPH0454858 B2 JP H0454858B2
- Authority
- JP
- Japan
- Prior art keywords
- cycle
- temperature
- switching
- heat exchanger
- defrosting
- 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 - Lifetime
Links
- 239000003507 refrigerant Substances 0.000 claims description 27
- 238000010257 thawing Methods 0.000 claims description 26
- 238000010438 heat treatment Methods 0.000 claims description 21
- 238000001514 detection method Methods 0.000 claims description 17
- 230000007423 decrease Effects 0.000 claims description 7
- 238000005057 refrigeration Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、セパレート形ヒートポンプ式空気調
和機の除霜制御装置に関するもので、特に室外側
熱交換器の着霜を室内側で検知し得るようにした
空気調和機に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a defrosting control device for a separate heat pump type air conditioner. Regarding air conditioners.
従来の技術
従来、特公昭59−34255号公報に示されるよう
に、室内側熱交換器の温度変化と室内温度の変化
の両者に基づいて室外側熱交換器への着霜状態を
検知し、暖房運転と除霜運転を制御する技術が開
発されている。Prior Art Conventionally, as shown in Japanese Patent Publication No. 59-34255, the state of frost on an outdoor heat exchanger is detected based on both the temperature change of the indoor heat exchanger and the indoor temperature change. Technologies have been developed to control heating and defrosting operations.
発明が解決しようとする問題点
しかしながら、かかる従来の構成は、温度検出
素子が複数必要となり、自と回路が複雑化する問
題がある。さらに、空気調和機においては、室内
側の送風量が任意に可変設定されることが常であ
り、そのためにも従来の技術に風量補正手段を加
味させることは、一層回路を複雑化してしまう。
しかも、かかる構成は熱交換器を流れている途中
の気液混合冷媒温度を検出しているため、着霜時
と未着霜時の温度変化が小さく、微小な範囲で着
霜判定を行わなければならず、検出精度が安定し
ない問題がある。Problems to be Solved by the Invention However, such a conventional configuration requires a plurality of temperature detection elements, and has the problem of complicating the circuit itself. Furthermore, in an air conditioner, the amount of air blown on the indoor side is usually variably set arbitrarily, and for this reason, adding an air amount correction means to the conventional technology would further complicate the circuit.
Moreover, since this configuration detects the temperature of the gas-liquid mixed refrigerant flowing through the heat exchanger, the temperature change between frost and non-frost is small, and frost formation must be determined within a minute range. However, there is a problem that the detection accuracy is unstable.
また近年、マイクロコンピユータにて複雑な信
号処理を行わせ、制御装置を構成することが多い
が、従来技術のように入力信号源（温度検出素
子）が多いことは、そのプログラム作成に当つて
も幣害のもとであり、プログラムの簡素化にも限
界がある。 In addition, in recent years, control devices are often configured by using microcomputers to perform complex signal processing, but the fact that there are many input signal sources (temperature detection elements) as in conventional technology makes it difficult to create programs. This is a source of financial harm, and there are limits to how simple the program can be.
以上のように、従来の技術には問題点が多々あ
り、改善が要求されるものである。 As described above, the conventional technology has many problems, and improvements are required.
本発明は、上記従来の問題点に鑑み、従来技術
の利点を損うことなく、構成の簡素化がはかれる
除霜制御装置を提供するものである。 In view of the above-mentioned conventional problems, the present invention provides a defrosting control device that can be simplified in configuration without sacrificing the advantages of the prior art.
問題点を解決するための手段
上記問題点を解決するために本発明は、第１図
に示すように冷凍サイクルを暖房サイクルから除
霜サイクルに制御する制御装置を、室内側熱交換
器の冷媒入口側に連結された配管の温度を検出す
る温度検出手段と、暖房サイクルを除霜サイクル
に切換える境界値温度を記憶した設定温度記憶手
段と、前記温度検出手段により検出した温度が前
記設定温度記憶手段に記憶された境界値温度より
低下したことを検出し出力する比較手段による境
界値低下信号により、暖房サイクルから除霜サイ
クルへの切換えを判定する判定手段と、前記判定
手段の出力に応じて前記冷凍サイクルを暖房運転
から除霜運転へ制御する選択出力手段より構成し
たものである。Means for Solving the Problems In order to solve the above problems, the present invention, as shown in FIG. temperature detection means for detecting the temperature of a pipe connected to the inlet side; set temperature storage means for storing a boundary value temperature for switching a heating cycle to a defrosting cycle; and a set temperature storage means for storing the temperature detected by the temperature detection means. determining means for determining switching from a heating cycle to a defrosting cycle based on a boundary value drop signal from a comparing means that detects and outputs a temperature drop below a boundary value stored in the means; The refrigeration cycle is comprised of selection output means for controlling the refrigeration cycle from heating operation to defrosting operation.
作 用
この構成により、温度検出手段の検出温度に応
じて、除霜運転が制御される。Effect: With this configuration, the defrosting operation is controlled according to the temperature detected by the temperature detection means.
実施例
以下、本発明の一実施例を第２図〜第５図を参
照にして説明する。Embodiment An embodiment of the present invention will be described below with reference to FIGS. 2 to 5.
第２図は、本発明の一実施例を示す冷凍サイク
ル図である。 FIG. 2 is a refrigeration cycle diagram showing one embodiment of the present invention.
同図において、冷凍サイクルは圧縮機１、四方
切換弁２、室内側熱交換器３、減圧器４、室外側
熱交換器５を順次連結することにより構成されて
いる。６は配管温度検出素子であり、暖房時にお
いて室内側熱交換器３（凝縮器）の冷媒入口側と
なる配管に取り付けられている。この場合、冷房
運転時は同図の実線矢印の方向に冷媒が流れ、暖
房運転時には四方切換弁２が切換わることにより
同図の破線矢印の方向に冷媒が流れるようになつ
ている。 In the figure, the refrigeration cycle is constructed by sequentially connecting a compressor 1, a four-way switching valve 2, an indoor heat exchanger 3, a pressure reducer 4, and an outdoor heat exchanger 5. Reference numeral 6 denotes a pipe temperature detection element, which is attached to a pipe that is on the refrigerant inlet side of the indoor heat exchanger 3 (condenser) during heating. In this case, during cooling operation, the refrigerant flows in the direction of the solid line arrow in the figure, and during heating operation, the four-way switching valve 2 is switched so that the refrigerant flows in the direction of the broken line arrow in the figure.
さらに、上記圧縮機１、四方切換弁２、減圧器
４、室外側熱交換器５および室外送風機８によつ
て室外ユニツトＡが構成されている。また上記室
内側熱交換器３および室内送風機７、さらに配管
温度検出素子６、温度調節機能と判断機能などが
プログラムされたマイクロコンピユータ（以下、
マイコンと略称する）を有する運転制御部（図示
せず）は室内ユニツトＢに設けられている。ここ
で、配管温度検出素子６は、室内送風機７の送風
の影響を受けない風回路からはずれた箇所に取付
けられている。また、室内ユニツトＢの近辺でも
よい。 Further, the compressor 1, the four-way switching valve 2, the pressure reducer 4, the outdoor heat exchanger 5, and the outdoor blower 8 constitute an outdoor unit A. In addition, a microcomputer (hereinafter referred to as
An operation control section (not shown) having a microcomputer (abbreviated as a microcomputer) is provided in the indoor unit B. Here, the pipe temperature detection element 6 is attached at a location away from the wind circuit where it is not affected by the air blowing from the indoor blower 7. Alternatively, the location may be near indoor unit B.
第３図は運転制御部における主要回路図であ
る。 FIG. 3 is a main circuit diagram of the operation control section.
同図において、マイコン９内にはコンパレータ
１１からの入力値より適宜出力信号を発生する駆
動信号発生手段１０を有している。このマイコン
９の入力側にはコンパレータ１１を介して温度検
出手段である配管温度検出素子６（例えば配管サ
ーミスタあるいは熱電対素子等）および抵抗１２
と必要に応じて抵抗値が変えられる温度設定用抵
抗１３，１４が接続されている。また出力側に
は、スイツチ用トランジスタTR1〜TR4を介して
駆動手段である四方切換弁コイルを駆動するリレ
ーR1、室内送風機７を駆動するリレーR2、室外
送風機８を駆動するリレーR3、圧縮機１を駆動
するリレーR4が接続されている。 In the figure, a microcomputer 9 includes drive signal generating means 10 for generating an appropriate output signal from an input value from a comparator 11. The input side of this microcomputer 9 is connected via a comparator 11 to a piping temperature detection element 6 (for example, a piping thermistor or thermocouple element, etc.) which is a temperature detection means, and a resistor 12.
Temperature setting resistors 13 and 14 whose resistance values can be changed as necessary are connected to the temperature setting resistors 13 and 14. Further, on the output side, there are a relay R 1 that drives a four-way switching valve coil, which is a driving means, through the switch transistors TR 1 to TR 4 , a relay R 2 that drives the indoor blower 7, and a relay R that drives the outdoor blower 8. 3 , the relay R4 that drives the compressor 1 is connected.
ここで、第３図の構成と第１図の構成を対比す
ると、配管温度検出素子６および抵抗１２は第１
図の温度検出手段に相当し、コンパレータ１１は
第１図の比較手段に相当し、抵抗１３，１４によ
つて作られる信号は第１図の設定温度記憶手段の
信号に相当し、マイコン９にある駆動信号発生手
段１０は判定手段、選択出力手段に相当する。 Here, comparing the configuration of FIG. 3 with the configuration of FIG. 1, the pipe temperature detection element 6 and the resistor 12 are
The comparator 11 corresponds to the comparison means in FIG. A certain drive signal generation means 10 corresponds to determination means and selection output means.
次に、暖房運転の開始から除霜運転に至るまで
の動作について説明する。 Next, the operation from the start of heating operation to defrosting operation will be explained.
圧縮機１の吐出冷媒温度をTd、圧縮機１の吸
入冷媒温度をTs、圧縮機１の吐出圧力をPd、圧
縮機１の吸入圧力をPsとし、ポリトロープ指数
をｎ（ただし１＜ｎ＜Ｋの関係で、Ｋは断熱圧縮
指数）とすると、吐出冷媒温度Tdは次式で表わ
される。 The discharge refrigerant temperature of compressor 1 is Td, the suction refrigerant temperature of compressor 1 is Ts, the discharge pressure of compressor 1 is Pd, the suction pressure of compressor 1 is Ps, and the polytropic index is n (where 1<n<K In the relationship, K is the adiabatic compression index), then the discharge refrigerant temperature Td is expressed by the following equation.
Td＝Ts・（Pd／Ps）n-1 o
したがつて、室外熱交換器５が未着霜時は吸入
冷媒温度Tsが高く、又吐出冷媒温度Tdも高い。
そして外気が下がり、着霜が成長するにつれて、
吸入冷媒温度Tsは低下し、吐出冷媒温度Tdも下
がる。本発明における配管温度検出素子６は、室
内側熱交換器３の入口配管に設けられ、圧縮機１
から吐出された高温高圧の過熱域冷媒ガスが流れ
る部分の温度を検出するが、実際その温度は吐出
ガスに比べて内外接続配管等での熱損失により所
定温度低下した温度である。 Td=Ts・(Pd/Ps) n-1 o Therefore, when the outdoor heat exchanger 5 is not frosted, the suction refrigerant temperature Ts is high, and the discharge refrigerant temperature Td is also high.
And as the outside air drops and the frost grows,
The suction refrigerant temperature Ts decreases, and the discharge refrigerant temperature Td also decreases. The pipe temperature detection element 6 in the present invention is provided in the inlet pipe of the indoor heat exchanger 3, and
The temperature of the part through which the high-temperature, high-pressure superheated refrigerant gas discharged from the refrigerant gas flows is detected, but the actual temperature is a predetermined temperature lower than that of the discharged gas due to heat loss in the internal and external connecting pipes.
したがつて、第４図に示すように室外側熱交換
器５が未着霜時は圧縮機１の吸入冷媒温度Ts、
室内側熱交換器３の入口配管温度ｔはともに高
く、着霜が進むにつれて徐々に低下し、そして暖
房能力を大幅に低下させる着霜に至ると、室内側
熱交換器３の入口配管温度ｔは極端に低下する。
すなわち、入口配管温度ｔが設定配管温度t1以下
になれば暖房能力は低下し、着霜が進んでいるの
で除霜する必要がある。 Therefore, as shown in FIG. 4, when the outdoor heat exchanger 5 is not frosted, the suction refrigerant temperature Ts of the compressor 1,
The inlet pipe temperature t of the indoor heat exchanger 3 is both high, and gradually decreases as frosting progresses, and when frost formation that significantly reduces the heating capacity occurs, the inlet pipe temperature t of the indoor heat exchanger 3 decreases. decreases dramatically.
That is, if the inlet pipe temperature t becomes equal to or lower than the set pipe temperature t1 , the heating capacity decreases, and since frost formation has progressed, it is necessary to defrost.
このように、室内側熱交換器３の入口配管温度
ｔは、過熱域冷媒ガスの温度であるため、室内送
風機７の風量の影響を受けにくく、室内側熱交換
器３の入口配管温度にて適確な除霜運転の判断を
行うことができる。 In this way, since the inlet pipe temperature t of the indoor heat exchanger 3 is the temperature of the refrigerant gas in the superheated region, it is not easily affected by the air volume of the indoor blower 7, and the inlet pipe temperature t of the indoor heat exchanger 3 is Appropriate defrosting operation decisions can be made.
以上の説明に基づき、第３図に示す制御回路
は、第５図に示すフローチヤートの内容の制御を
行う。 Based on the above explanation, the control circuit shown in FIG. 3 controls the contents of the flowchart shown in FIG. 5.
すなわち、第５図のステツプ１で示すように暖
房運転が開始されると、配管温度検出素子６によ
る配管温度ｔの読み込みが行われ（ステツプ２）、
ステツプ３に移つて配管温度ｔが設定配管温度t1
よりも低いかが判定される。具体的には第３図の
コンパレータ１１が判定する。 That is, when the heating operation is started as shown in step 1 in FIG. 5, the pipe temperature t is read by the pipe temperature detection element 6 (step 2).
Moving to step 3, the pipe temperature t is the set pipe temperature t 1
It is determined whether it is lower than . Specifically, the comparator 11 shown in FIG. 3 makes the determination.
そしてステツプ３の条件が満足されるとステツ
プ４へ移り、除霜運転が開始される。すなわち、
第３図のトランジスタTR1，TR2，TR3，TR4が
それぞれ動作し、四方切換弁２を切換え、必要に
応じてその前に圧縮機１を一定時間停止し、室内
送風機７および室外送風機８を停止する。そして
冷房サイクルにて除霜を行う。この除霜運転の内
容は従来周知のため、詳細な説明を省略する。ま
た暖房運転の復帰についても従来より周知の如
く、適宜手段にて実施できる。 When the conditions of step 3 are satisfied, the process moves to step 4 and defrosting operation is started. That is,
The transistors TR 1 , TR 2 , TR 3 , and TR 4 in FIG. 3 operate to switch the four-way switching valve 2, and if necessary, before that, the compressor 1 is stopped for a certain period of time, and the indoor blower 7 and the outdoor blower are Stop 8. Defrost is then performed in the cooling cycle. Since the content of this defrosting operation is conventionally well known, detailed explanation will be omitted. Further, the restoration of the heating operation can be carried out by any suitable means as is well known in the art.
なお、本実施例においては、除霜運転を暖房サ
イクルから冷房サイクルへの切換えによつて行う
ようにしたが、例えば暖房サイクルを維持したま
まとして室外側熱交換器へ別途蓄熱していた冷媒
を流す構成あるいは、別熱源にて霜を溶かす構成
としてもよいことは言うまでもない。また圧縮機
１は除霜運転へ切換え時には連続運転とし、暖房
運転復帰前に一時停止させるようにしてもよい。 In this embodiment, the defrosting operation is performed by switching from the heating cycle to the cooling cycle. It goes without saying that a configuration in which the frost is allowed to flow or a configuration in which a separate heat source is used to melt the frost may also be used. Further, the compressor 1 may be operated continuously when switching to defrosting operation, and may be temporarily stopped before returning to heating operation.
発明の効果
以上並べたように本発明によれば、上記した構
成により、過熱域冷媒ガスの温度を室内側熱交換
器入口配管にて検出し、室内風量の影響をあまり
受けずに、適確な除霜運転を温度検出１点で行う
ことができ、構成が非常に簡単であり、また冷媒
が、暖房を行う熱量を十分に有しているか否かの
判定が室内側熱交換器の入口側で行えるため、実
際の暖房能力の有無を確実に判断して除霜を行う
ことができる。Effects of the Invention As described above, according to the present invention, the temperature of the refrigerant gas in the superheated region is detected at the indoor heat exchanger inlet piping, and the temperature of the refrigerant gas in the superheated region is detected accurately without being affected by the indoor air volume. The defrosting operation can be performed with one temperature detection point, the configuration is very simple, and it can be determined whether the refrigerant has enough heat for heating at the inlet of the indoor heat exchanger. Since defrosting can be done on the side, it is possible to reliably determine whether there is actual heating capacity before defrosting.
すなわち、本発明は完全に着霜が発生している
冷媒の温度が熱交換器の入口部、中間部に差がな
く、未着霜時に入口冷媒温度の方が中間部の冷媒
温度に比べて著しく高い点に着眼し、入口側の冷
媒温度を検出することによつて、未着霜から着霜
に至るまでの温度変化が大きくとれ、１点の温度
検出で限界に近い暖房能力を引き出すことができ
る。 In other words, in the present invention, there is no difference in the temperature of the refrigerant at the inlet part and the middle part of the heat exchanger when frost has completely formed, and when no frost has formed, the inlet refrigerant temperature is higher than the refrigerant temperature in the middle part. By focusing on extremely high points and detecting the refrigerant temperature on the inlet side, it is possible to obtain large temperature changes from non-frost to frost, and to extract heating capacity close to the limit by detecting the temperature at one point. I can do it.
第１図は本発明の除霜制御装置を機能実現手段
で表現したブロツク図、第２図は本発明の一実施
例を示す空気調和機の冷凍サイクル図、第３図は
同空気調和機における除霜制御装置の回路図、第
４図は同除霜制御装置における室内側熱交換器へ
流入する冷媒温度と圧縮機吸入冷媒温度の関係を
示す特性図、第５図は同除霜制御装置の動作内容
を示すフローチヤートである。
１……圧縮機、２……四方切換弁、３……室内
側熱交換器、５……室外側熱交換器、６……配管
温度検出素子、９……マイクロコンピユータ、１
０……駆動信号発生手段、１１……コンパレー
タ、１２，１３，１４……抵抗、Ａ……室外ユニ
ツト、Ｂ……室内ユニツト。
Fig. 1 is a block diagram expressing the defrosting control device of the present invention using function realizing means, Fig. 2 is a refrigeration cycle diagram of an air conditioner showing an embodiment of the present invention, and Fig. 3 is a diagram of the defrosting control device of the present invention. A circuit diagram of the defrosting control device, Fig. 4 is a characteristic diagram showing the relationship between the temperature of the refrigerant flowing into the indoor heat exchanger and the compressor suction refrigerant temperature in the defrosting control device, and Fig. 5 is a diagram showing the relationship between the temperature of the refrigerant flowing into the indoor heat exchanger in the defrosting control device This is a flowchart showing the operation contents. DESCRIPTION OF SYMBOLS 1... Compressor, 2... Four-way switching valve, 3... Indoor heat exchanger, 5... Outdoor heat exchanger, 6... Piping temperature detection element, 9... Microcomputer, 1
0... Drive signal generating means, 11... Comparator, 12, 13, 14... Resistor, A... Outdoor unit, B... Indoor unit.
Claims (1)
熱交換器を具備した冷凍サイクルに、暖房サイク
ルと除霜サイクルを切換えるサイクル切換手段を
設け、さらに前記サイクル切換手段を暖房サイク
ルから除霜サイクルに切換える制御装置を、前記
室内側熱交換器の冷媒入口側に連結された配管の
うち過熱域冷媒ガスが流れる部分の温度を検出す
る温度検出手段と、暖房サイクルを除霜サイクル
に切換える境界値温度を記憶した設定温度記憶手
段と、前記温度検出手段により検出した温度が前
記設定温度記憶手段に記憶された境界値温度より
低下したことを検出し出力する比較手段による境
界値低下信号により、暖房サイクルから除霜サイ
クルへの切換えを判定する判定手段と、前記判定
手段の出力に応じて前記サイクル切換手段を駆動
する出力手段より構成するとともに、前記制御装
置を室内ユニツトに設けたセパレート形空気調和
機の除霜制御装置。1. A refrigeration cycle equipped with a compressor, an indoor heat exchanger, a pressure reducing device, and an outdoor heat exchanger is provided with cycle switching means for switching between a heating cycle and a defrosting cycle, and the cycle switching means switches from the heating cycle to the defrosting cycle. A control device for switching the heating cycle to a defrosting cycle, a temperature detection means for detecting the temperature of a portion of the pipe connected to the refrigerant inlet side of the indoor heat exchanger through which superheated refrigerant gas flows, and a boundary for switching the heating cycle to the defrosting cycle. A boundary value decrease signal is generated by a set temperature storage means that stores the value temperature and a comparison means that detects and outputs that the temperature detected by the temperature detection means has fallen below the boundary value temperature stored in the set temperature storage means. A separate air conditioner comprising a determining means for determining switching from a heating cycle to a defrosting cycle, and an output means for driving the cycle switching means in accordance with the output of the determining means, and the control device is provided in an indoor unit. Defrost control device for conditioner.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60258003A JPS62119346A (en) | 1985-11-18 | 1985-11-18 | Defrosting control device of air conditioner |
| KR1019860009521A KR900005722B1 (en) | 1985-11-18 | 1986-11-12 | Defrosting control apparatus for a temperature control system |
| GB8627102A GB2183868B (en) | 1985-11-18 | 1986-11-13 | Defrosting control apparatus of air-conditioning |
| US06/930,754 US4790144A (en) | 1985-11-18 | 1986-11-14 | Defrosting control apparatus for a temperature control system |
| AU65337/86A AU573994B2 (en) | 1985-11-18 | 1986-11-14 | Defrosting control for air-conditioner |
| CN86107773.3A CN1005126B (en) | 1985-11-18 | 1986-11-18 | Control apparatus of removing ice and frost for air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60258003A JPS62119346A (en) | 1985-11-18 | 1985-11-18 | Defrosting control device of air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62119346A JPS62119346A (en) | 1987-05-30 |
| JPH0454858B2 true JPH0454858B2 (en) | 1992-09-01 |
Family
ID=17314182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60258003A Granted JPS62119346A (en) | 1985-11-18 | 1985-11-18 | Defrosting control device of air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62119346A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO20190565A1 (en) | 2018-05-22 | 2019-11-25 | Tag Sensors As | Tag for temperature monitoring |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54154851A (en) * | 1978-05-26 | 1979-12-06 | Saginomiya Seisakusho Inc | Defrost control method of heating or freezing and cooling apparatus and defrost controller |
-
1985
- 1985-11-18 JP JP60258003A patent/JPS62119346A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54154851A (en) * | 1978-05-26 | 1979-12-06 | Saginomiya Seisakusho Inc | Defrost control method of heating or freezing and cooling apparatus and defrost controller |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62119346A (en) | 1987-05-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |