JPH0760022B2 - Air conditioner compressor overheat prevention control device - Google Patents
Air conditioner compressor overheat prevention control deviceInfo
- Publication number
- JPH0760022B2 JPH0760022B2 JP62009307A JP930787A JPH0760022B2 JP H0760022 B2 JPH0760022 B2 JP H0760022B2 JP 62009307 A JP62009307 A JP 62009307A JP 930787 A JP930787 A JP 930787A JP H0760022 B2 JPH0760022 B2 JP H0760022B2
- Authority
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- Prior art keywords
- compressor
- temperature
- expansion valve
- maximum
- minimum
- 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.)
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- Air Conditioning Control Device (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、周波数変化器を備えた空気調和機の圧縮機過
熱防止制御装置に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor overheat prevention control device for an air conditioner equipped with a frequency changer.
従来の技術 従来より圧縮機の過圧縮や、過熱度の高い吸入冷媒ガス
での圧縮機の運転がされた場合、吐出冷媒温度が高すぎ
ると、圧縮機潤滑油の劣化および炭化、圧縮機の過熱に
よる電動機巻線の絶縁劣化、構成部品の劣化等問題とな
るため、圧縮機過熱防止がされている。2. Description of the Related Art Conventionally, when the compressor is over-compressed or operated with suction refrigerant gas with a high degree of superheat, if the discharge refrigerant temperature is too high, deterioration and carbonization of the compressor lubricating oil, Since overheating causes problems such as insulation deterioration of the motor winding and deterioration of component parts, overheating of the compressor is prevented.
以下図面を参照しながら、従来の空気調和機過熱防止制
御装置の一例につき説明する。An example of a conventional air conditioner overheat prevention control device will be described below with reference to the drawings.
第６図は従来例の電気回路を示し、101は温度スイッチ
を示し、102の圧縮機外郭に取付られている。103はマイ
クロコンピュータ（以下マイコンと称す）であり、104
はマイコン103の信号を受けて圧縮機を駆動する周波数
変化器である。FIG. 6 shows an electric circuit of a conventional example, 101 is a temperature switch, and is attached to the outer casing of the compressor 102. 103 is a microcomputer (hereinafter referred to as a microcomputer), and 104
Is a frequency changer that receives a signal from the microcomputer 103 and drives the compressor.
温度スイッチ101は、ある温度以上になると接点を開
き、ある温度以下では復帰する様になっており、その信
号がマイコン103に入り、圧縮機102の運転停止信号を周
波数変化器104に送る様になっている。The temperature switch 101 opens contacts when the temperature exceeds a certain temperature, and recovers when the temperature falls below the certain temperature.The signal enters the microcomputer 103, and an operation stop signal of the compressor 102 is sent to the frequency changer 104. Has become.
第７図は、従来例の温度スイッチの温度と圧縮機運転周
波数の関係の説明図である。温度スイッチの温度がT1に
達すると圧縮機の過熱を防止するため圧縮機が停止し、
T2に達すると復帰して圧縮機を運転する。FIG. 7 is an explanatory diagram of the relationship between the temperature of the conventional temperature switch and the compressor operating frequency. When the temperature of the temperature switch reaches T 1 , the compressor stops to prevent overheating of the compressor,
When T 2 is reached, it returns to operate the compressor.
発明が解決しようとする問題点 しかしながら上記の構成では、温度スイッチの動作と同
時に、圧縮機を停止し温度スイッチの復帰と共に圧縮機
を運転するものであるから、空調機を必要とする時でも
圧縮機保護のため圧縮機が停止し、使用者に不快を与
え、快適性を損なうという問題点があった。Problems to be Solved by the Invention However, in the above-mentioned configuration, since the compressor is stopped and the compressor is operated at the same time as the operation of the temperature switch, the compression is performed even when the air conditioner is required. There is a problem in that the compressor is stopped to protect the machine, causing discomfort to the user and impairing comfort.
問題点を解決するための手段 本発明は上記問題点を解決するため、圧縮機外郭又は吐
出配管に設けた冷媒温度検出手段と、前記冷媒温度とあ
らかじめ設定された第１〜第３の設定温度とを比較演算
する比較演算手段と、冷媒流量を調整する膨張弁の開度
を変更する膨張弁開度変更手段と、前記膨張弁の開度の
最大最小を判定する膨張弁開度最大最小判定手段と、圧
縮機の駆動周波数を変更する圧縮機駆動手段と、前記圧
縮機の駆動周波数の最大最小を判定する周波数最大最小
判定手段とを設け、前記比較演算手段により冷媒温度が
前記第１の設定温度より高いと判定すると、前記膨張弁
開度変更手段により前記膨張弁の開度を順次大きくし、
前記膨張弁開度最大最小判定手段が前記膨張弁の開度が
最大であると判定した状態で、前記比較演算手段により
冷媒温度が前記第１の設定温度より高いと判定した場合
は、前記圧縮機駆動手段により前記圧縮機の駆動周波数
を順次下げ、前記周波数最大最小判定手段により前記圧
縮機の駆動周波数が最小であると判定した状態で、前記
比較演算手段により冷媒温度が前記第１の設定温度より
高い第２の設定温度より高いと判定した場合は、前記圧
縮機を停止させるとともに、前記比較演算手段により冷
媒温度が前記第１の設定温度より低い前記第３の設定温
度より低いと判定した場合は、前記周波数最大最小判定
手段が前記圧縮機の駆動周波数が最大であると判定しな
いことにより、冷媒温度が前記第３の設定温度より低い
と判定している間、前記圧縮機駆動手段により前記圧縮
機の駆動周波数を上げ、さらに前記前記膨張弁開度最大
最小判定手段が前記膨張弁の開度が最小であると判定し
ないことにより、冷媒温度が前記第３の設定温度より低
いと判定している間、前記膨張弁開度変更手段により前
記膨張弁の開度を下げる構成としたものである。Means for Solving the Problems In order to solve the above problems, the present invention provides a refrigerant temperature detecting means provided in a compressor outer shell or a discharge pipe, the refrigerant temperature, and first to third preset temperatures set in advance. Comparison calculation means for comparing and calculating, expansion valve opening degree changing means for changing the opening degree of the expansion valve for adjusting the refrigerant flow rate, expansion valve opening maximum and minimum determination for determining the maximum and minimum of the opening degree of the expansion valve Means, a compressor drive means for changing the drive frequency of the compressor, and a frequency maximum / minimum determination means for determining the maximum / minimum of the drive frequency of the compressor are provided, and the refrigerant temperature is determined by the comparison operation means to be the first When it is determined that the temperature is higher than the set temperature, the expansion valve opening changing means sequentially increases the opening of the expansion valve,
When the expansion valve opening maximum / minimum determining means determines that the opening degree of the expansion valve is maximum and the comparison calculating means determines that the refrigerant temperature is higher than the first set temperature, the compression is performed. In the state where the drive frequency of the compressor is sequentially reduced by the machine drive means, and the drive frequency of the compressor is determined to be the minimum by the frequency maximum / minimum determination means, the refrigerant temperature is set to the first setting by the comparison calculation means. When it is determined that the temperature is higher than the second set temperature higher than the temperature, the compressor is stopped, and the refrigerant temperature is determined by the comparison calculation means to be lower than the third set temperature lower than the first set temperature. In this case, the frequency maximum / minimum determination means does not determine that the drive frequency of the compressor is the maximum, so that the refrigerant temperature is determined to be lower than the third set temperature. By increasing the drive frequency of the compressor by the compressor driving means and not determining that the expansion valve opening maximum / minimum determination means is the minimum opening of the expansion valve, the refrigerant temperature is the third one. While it is determined that the temperature is lower than the set temperature, the expansion valve opening changing means reduces the opening of the expansion valve.
作用 本発明は上記の構成により、圧縮機又は吐出配管で検出
された冷媒温度と設定温度の比較演算結果により、まず
第１の設定温度を超えると膨張弁開度を大きくすること
により冷媒温度を下げ、膨張弁開度最大になっても尚超
える場合に圧縮機周波数を下げ制御し、圧縮機周波数最
小となっても冷媒温度が上昇し第２の設定温度を超える
場合にのみ圧縮機を停止するものである。又これらの制
御により冷媒温度が下がり第３の設定温度以下になると
まず圧縮機周波数を上げ、周波数最大になっても冷媒温
度が第１の設定温度まで達しない場合は、膨張弁開度を
小さくすることにより、冷媒温度を一定温度以下におさ
えることにより冷凍サイクルを保護するとともに、停止
頻度を最小限にし、しかも圧縮機の周波数を高く保つこ
とにより性能維持をはかり快適性の向上がはかれるもの
である。Effect The present invention has the above-described configuration, and based on the result of comparison calculation of the refrigerant temperature detected in the compressor or the discharge pipe and the set temperature, first, when the first set temperature is exceeded, the expansion valve opening is increased to increase the refrigerant temperature. When the expansion valve opening is maximized and still exceeds the maximum, the compressor frequency is controlled to be decreased, and even if the compressor frequency is minimized, the refrigerant temperature rises and the compressor is stopped only when the second set temperature is exceeded. To do. When the refrigerant temperature is lowered by these controls and becomes equal to or lower than the third set temperature, the compressor frequency is first increased, and if the refrigerant temperature does not reach the first set temperature even when the frequency becomes maximum, the expansion valve opening degree is decreased. By keeping the refrigerant temperature below a certain temperature, the refrigeration cycle is protected, the frequency of stoppage is minimized, and the frequency of the compressor is kept high to maintain performance and improve comfort. is there.
実施例 以下本発明の一実施例の空気調和機の圧縮機過熱防止制
御装置について、図面を参照しながら説明する。Embodiment Hereinafter, a compressor overheat prevention control device for an air conditioner according to an embodiment of the present invention will be described with reference to the drawings.
第２図は本発明の一実施例の電気回路図である。１は冷
媒温度検出用サーミスタであり、検出された冷媒温度は
マイクロコンピュータ２に入力される。マイコン２で
は、冷媒温度とある設定温度との比較演算および膨張弁
３の開度最大最小判定、周波数の最大最小判定を行ない
膨張弁３の開度変更出力、周波数変更出力、運転停止の
命令出力を行なう。マイコン２からの出力命令は、３の
周波数変化器で受け、圧縮機４の駆動、停止等行なう。FIG. 2 is an electric circuit diagram of an embodiment of the present invention. Reference numeral 1 denotes a refrigerant temperature detecting thermistor, and the detected refrigerant temperature is input to the microcomputer 2. The microcomputer 2 performs a comparison calculation between the refrigerant temperature and a certain set temperature, a maximum / minimum judgment of the opening of the expansion valve 3, and a maximum / minimum judgment of the frequency, and outputs the opening change output of the expansion valve 3, the frequency change output, and the operation stop command output. Do. An output command from the microcomputer 2 is received by the frequency changer 3 to drive and stop the compressor 4.
以上のように構成された空気調和機の圧縮機過熱防止制
御装置について、以下第３図より第５図を用いてその動
作を説明する。The operation of the compressor overheat prevention control device for an air conditioner configured as described above will be described below with reference to FIGS. 3 to 5.
第３図、第４図は本実施例におけるフローチャート図で
ある。3 and 4 are flowcharts in this embodiment.
圧縮機運転中に、圧縮機外郭又は吐出管より検出された
冷媒温度は、第１の設定温度である設定温度Ａと比較さ
れ高ければ、次に第２の設定温度である設定温度Ｂと比
較される。第２の設定温度である設定温度Ｂより低けれ
ば、次に膨張弁開度が最大か判定される。ここで開度が
最大でなければ膨張弁開度を上げ冷媒温度を下げるべく
くり返えされる。膨張弁開度が最大となった場合は、圧
縮機の周波数が最小となるまで圧縮機周波数を下げるべ
くくり返され冷媒温度を下げる。During operation of the compressor, the refrigerant temperature detected from the outer shell of the compressor or the discharge pipe is compared with the set temperature A which is the first set temperature, and if it is higher, it is then compared with the set temperature B which is the second set temperature. To be done. If the temperature is lower than the second set temperature B, which is the second set temperature, it is next determined whether the expansion valve opening is the maximum. If the opening is not maximum here, the expansion valve opening is increased and the refrigerant temperature is decreased. When the expansion valve opening becomes maximum, the temperature of the compressor is repeated until the frequency of the compressor becomes minimum, and the refrigerant temperature is decreased.
ここで冷媒温度が設定温度Ａより低ければ、次に第３の
設定温度である設定温度Ｃと比較され、高ければそのま
まの状態が維持される、低ければ、次に周波数最大か判
定され、最大でなければ周波数を上げる出力がされる。
最大であれば、次に膨張弁開度最小か判定され、最小で
なければ膨張弁開度を少なくする出力をされる。最小の
時はそのままの状態が維持される。Here, if the refrigerant temperature is lower than the set temperature A, it is compared with the set temperature C which is the third set temperature next, and if it is high, the state is maintained as it is. Otherwise, the output that raises the frequency is output.
If it is the maximum, it is then determined whether the expansion valve opening is the minimum. If it is not the minimum, the expansion valve opening is reduced. At the minimum, the state is maintained as it is.
次に、膨張弁開度および周波数調整にもかかわらず冷媒
温度が設定温度Ｂより高くなった場合は、圧縮機停止出
力がされ圧縮機を停止する。停止後、冷媒温度が設定温
度Ｃより下回れば圧縮機運転出力され、圧縮機運転する
ものである。Next, when the refrigerant temperature becomes higher than the set temperature B despite the expansion valve opening degree and the frequency adjustment, the compressor stop output is performed to stop the compressor. After the stop, if the refrigerant temperature is lower than the set temperature C, the compressor operation is output and the compressor is operated.
第５図は、本実施例の冷媒温度と圧縮機周波数および膨
張弁開度との関係を示す説明図である。FIG. 5 is an explanatory diagram showing the relationship between the refrigerant temperature, the compressor frequency, and the expansion valve opening degree in this embodiment.
Tdは、圧縮機又は吐出管より検出された冷媒温度を示
し、Ｖは、膨張弁の開度を示し、Ｆは、圧縮機の周波数
を示す。 Td represents the refrigerant temperature detected from the compressor or the discharge pipe, V represents the opening of the expansion valve, and F represents the frequency of the compressor.
冷媒温度Tdが設定温度Ａより高くなると、膨張弁開度Ｖ
が上げられ、膨張弁流量が増へ冷媒温度Tdが下げられ
る。膨張弁開度Ｖは、最大になるまで上げられても尚、
設定温度Ａより冷媒温度が高い場合は、圧縮機周波数Ｆ
が下げられる。設定温度Ａを下回れば、その時の膨張弁
開度、圧縮機周波数にて運転される。When the refrigerant temperature T d becomes higher than the set temperature A, the expansion valve opening degree V
Is increased, the expansion valve flow rate is increased, and the refrigerant temperature T d is decreased. Even if the expansion valve opening degree V is increased to the maximum,
When the refrigerant temperature is higher than the set temperature A, the compressor frequency F
Can be lowered. If the temperature is lower than the set temperature A, the expansion valve opening and the compressor frequency at that time are operated.
又、設定温度Ｃを下回れば、まず圧縮機の周波数を上げ
る出力し、最大周波数になっても設定温度Ｃを下回って
いる場合膨張弁開度を下げる。If the temperature is lower than the set temperature C, the frequency of the compressor is first increased, and if the temperature is lower than the set temperature C even at the maximum frequency, the expansion valve opening is decreased.
ここで設定温度Ａを上回り膨張弁開度が最大かつ、圧縮
機周波数が最小となっても設定温度Ｂを超えた場合にの
み圧縮機を停止させ、冷媒温度が下がり、設定温度Ｃを
下回れば、圧縮機運転を再開させるものである。Here, the compressor is stopped only when the temperature exceeds the set temperature A, the expansion valve opening is maximum, and the compressor frequency is the minimum, but the set temperature B is exceeded, and the refrigerant temperature is lowered and the set temperature C is lowered. , To restart the compressor operation.
以上の説明で明らかなように本発明は、空調機の運転の
必要な過負荷時に、冷媒温度を膨張弁の開度、圧縮機周
波数で制御することによって、冷媒過熱を防止し冷凍サ
イクルの保護をはかりつつ、保護による空調機の運転停
止の頻度を少なくすることにより快適性の向上がはかれ
る効果を有するものである。As is clear from the above description, the present invention prevents refrigerant overheating and controls the refrigeration cycle by controlling the refrigerant temperature with the opening of the expansion valve and the compressor frequency when the air conditioner needs to be overloaded. In addition to the above, it is possible to improve comfort by reducing the frequency of operation stoppage of the air conditioner due to protection.
発明の効果 上記実施例で明らかなように本発明の空気調和機の圧縮
機過熱防止制御装置は、冷媒温度を膨張弁の開度、圧縮
機周波数等により制御することによって一定温度以下に
おさえ、冷媒過熱による冷凍サイクルの保護をはかると
ともに、保護による圧縮機の停止頻度を押さえることに
より、空気調和機の運転を必要とする時の停止による不
快を防止し、快適性の向上がはかれるなど、種々の利点
を奏するものである。Effects of the Invention As is clear from the above embodiments, the compressor overheat prevention control device for an air conditioner of the present invention is kept below a certain temperature by controlling the refrigerant temperature by the opening of the expansion valve, the compressor frequency, etc. In addition to protecting the refrigeration cycle due to refrigerant overheating, by suppressing the frequency of compressor stoppage due to protection, it is possible to prevent discomfort due to stoppage when the air conditioner needs to be operated, improve comfort, etc. The advantages of.
第１図は本発明のクレーム対応図、第２図は本発明の一
実施例における圧縮機過熱防止制御装置の電気回路図、
第３図、第４図は同制御内容を示すフローチャート図、
第５図は同冷媒温度と膨張弁開度と周波数の関係を示す
特性図、第６図は従来例の電気回路図、第７図は従来例
の温度スイッチ温度と圧縮機運転周波数の関係を示す特
性図である。 １……冷媒温度検出用サーミスタ、２……マイコン、３
……膨張弁、４……周波数変化器、５……圧縮機。FIG. 1 is a diagram corresponding to the claims of the present invention, and FIG. 2 is an electric circuit diagram of a compressor overheat prevention control device according to an embodiment of the present invention.
3 and 4 are flowcharts showing the control contents,
FIG. 5 is a characteristic diagram showing the relationship between the refrigerant temperature, the expansion valve opening degree and the frequency, FIG. 6 is an electric circuit diagram of the conventional example, and FIG. 7 is a relationship between the temperature switch temperature and the compressor operating frequency of the conventional example. It is a characteristic view to show. 1 ... Refrigerant temperature detection thermistor, 2 ... Microcomputer, 3
...... Expansion valve, 4 ... Frequency changer, 5 ... Compressor.
Claims (1)
検出手段と、前記冷媒温度とあらかじめ設定された第１
〜第３の設定温度とを比較演算する比較演算手段と、冷
媒流量を調整する膨張弁の開度を変更する膨張弁開度変
更手段と、前記膨張弁の開度の最大最小を判定する膨張
弁開度最大最小判定手段と、圧縮機の駆動周波数を変更
する圧縮機駆動手段と、前記圧縮機の駆動周波数の最大
最小を判定する周波数最大最小判定手段とを設け、前記
比較演算手段により冷媒温度が前記第１の設定温度より
高いと判定すると、前記膨張弁開度変更手段により前記
膨張弁の開度を順次大きくし、前記膨張弁開度最大最小
判定手段が前記膨張弁の開度が最大であると判定した状
態で、前記比較演算手段により冷媒温度が前記第１の設
定温度より高いと判定した場合は、前記圧縮機駆動手段
により前記圧縮機の駆動周波数を順次下げ、前記周波数
最大最小判定手段により前記圧縮機の駆動周波数が最小
であると判定した状態で、前記比較演算手段により冷媒
温度が前記第１の設定温度より高い第２の設定温度より
高いと判定した場合は、前記圧縮機を停止させるととも
に、前記比較演算手段により冷媒温度が前記第１の設定
温度より低い前記第３の設定温度より低いと判定した場
合は、前記周波数最大最小判定手段が前記圧縮機の駆動
周波数が最大であると判定しないことにより、冷媒温度
が前記第３の設定温度より低いと判定している間、前記
圧縮機駆動手段により前記圧縮機の駆動周波数を上げ、
さらに前記前記膨張弁開度最大最小判定手段が前記膨張
弁の開度が最小であると判定しないことにより、冷媒温
度が前記第３の設定温度より低いと判定している間、前
記膨張弁開度変更手段により前記膨張弁の開度を下げる
構成とした空気調和機の圧縮機過熱防止制御装置。1. A refrigerant temperature detecting means provided in an outer casing of a compressor or a discharge pipe, and a first temperature preset with the refrigerant temperature.
-Comparison means for comparing and calculating the third set temperature, expansion valve opening degree changing means for changing the opening degree of the expansion valve for adjusting the refrigerant flow rate, and expansion for judging the maximum and minimum of the opening degree of the expansion valve A valve opening maximum / minimum determination means, a compressor driving means for changing the drive frequency of the compressor, and a frequency maximum / minimum determination means for determining the maximum / minimum of the drive frequency of the compressor are provided, and the refrigerant is calculated by the comparison calculation means. When it is determined that the temperature is higher than the first set temperature, the expansion valve opening degree changing means sequentially increases the opening degree of the expansion valve, and the expansion valve opening maximum / minimum determining means determines that the expansion valve opening degree is When it is determined that the refrigerant temperature is higher than the first set temperature by the comparison calculation means in the state of being determined to be the maximum, the compressor drive means sequentially decreases the drive frequency of the compressor, and the frequency maximum Minimum judgment means When it is determined that the refrigerant temperature is higher than the second set temperature higher than the first set temperature by the comparison calculation means in the state where the drive frequency of the compressor is determined to be the minimum, When it is determined that the refrigerant temperature is lower than the third preset temperature lower than the first preset temperature by the comparison calculation means while stopping, the frequency maximum / minimum determination means determines that the drive frequency of the compressor is maximum. By not determining that there is, while it is determined that the refrigerant temperature is lower than the third set temperature, the drive frequency of the compressor is increased by the compressor drive means,
Further, since the expansion valve opening maximum / minimum determination means does not determine that the expansion valve opening is minimum, the expansion valve opening is performed while the refrigerant temperature is determined to be lower than the third set temperature. A controller for preventing overheating of a compressor of an air conditioner configured to reduce the opening degree of the expansion valve by a degree changing means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62009307A JPH0760022B2 (en) | 1987-01-19 | 1987-01-19 | Air conditioner compressor overheat prevention control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62009307A JPH0760022B2 (en) | 1987-01-19 | 1987-01-19 | Air conditioner compressor overheat prevention control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63176955A JPS63176955A (en) | 1988-07-21 |
| JPH0760022B2 true JPH0760022B2 (en) | 1995-06-28 |
Family
ID=11716813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62009307A Expired - Fee Related JPH0760022B2 (en) | 1987-01-19 | 1987-01-19 | Air conditioner compressor overheat prevention control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0760022B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3448432B2 (en) * | 1996-07-17 | 2003-09-22 | 株式会社エヌ・ティ・ティ ファシリティーズ | Control device for air conditioner |
| JP4784385B2 (en) * | 2006-04-28 | 2011-10-05 | パナソニック株式会社 | Refrigeration cycle equipment |
| JP6387873B2 (en) * | 2015-03-18 | 2018-09-12 | 株式会社デンソー | Refrigeration cycle equipment |
| JP6401658B2 (en) * | 2015-05-08 | 2018-10-10 | 日立ジョンソンコントロールズ空調株式会社 | Air conditioner |
| JP2018146159A (en) * | 2017-03-03 | 2018-09-20 | 日立ジョンソンコントロールズ空調株式会社 | Air conditioner |
| CN114646156A (en) * | 2022-03-16 | 2022-06-21 | 青岛海尔空调器有限总公司 | Control method, control device, equipment and medium for electronic expansion valve of air conditioner |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59170653A (en) * | 1983-03-17 | 1984-09-26 | 株式会社東芝 | Air conditioner |
| JPS61285349A (en) * | 1985-06-11 | 1986-12-16 | 松下電器産業株式会社 | Controller for capacity of air conditioner |
-
1987
- 1987-01-19 JP JP62009307A patent/JPH0760022B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59170653A (en) * | 1983-03-17 | 1984-09-26 | 株式会社東芝 | Air conditioner |
| JPS61285349A (en) * | 1985-06-11 | 1986-12-16 | 松下電器産業株式会社 | Controller for capacity of air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63176955A (en) | 1988-07-21 |
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| LAPS | Cancellation because of no payment of annual fees |