JPH0535334B2 - - Google Patents
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- Publication number
- JPH0535334B2 JPH0535334B2 JP61274655A JP27465586A JPH0535334B2 JP H0535334 B2 JPH0535334 B2 JP H0535334B2 JP 61274655 A JP61274655 A JP 61274655A JP 27465586 A JP27465586 A JP 27465586A JP H0535334 B2 JPH0535334 B2 JP H0535334B2
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- Japan
- Prior art keywords
- compressor
- value
- capacity
- pressure
- operating capacity
- Prior art date
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- Control Of Positive-Displacement Pumps (AREA)
- Air Conditioning Control Device (AREA)
Description
【発明の詳細な説明】
(イ) 産業上の利用分野
本発明は能力可変型の圧縮機を用いる空気調和
機の保護において、特に圧縮機の高圧力運転時の
保護に関するものである。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to protection of an air conditioner using a variable capacity compressor, and particularly to protection during high pressure operation of the compressor.
(ロ) 従来の技術
一般に圧縮機の高圧力運転（高負荷運転）を保
護するものとしては特開昭60−126534号公報に記
載されているようなものがあつた。この公報に記
載されたものは、圧縮機の運転時の状態を圧縮機
に流れる電流から求めたものであり、圧縮機が高
圧力運転になるに連れて検出する電流量が増加す
るものであつた。この公報では電流量をC.T（電
流トランス）などの検出器で検出し、この検出値
を所定周期毎にサンプリングし、このサンプリン
グによつて得られた検出値の変化分が一定値以上
となつた時に送風機の回転数を減らして熱交換器
の熱交換量を減らし圧縮機の高圧力運転を抑制す
るものであつた。すなわち、高圧力運転による圧
縮機のロツク状態や破損を防止するものであつ
た。(B) Prior Art In general, there is a device for protecting high pressure operation (high load operation) of a compressor as described in Japanese Patent Application Laid-open No. 126534/1983. What is described in this bulletin is that the state of the compressor during operation is determined from the current flowing through the compressor, and the amount of current detected increases as the compressor operates at high pressure. Ta. In this publication, the amount of current is detected by a detector such as a CT (current transformer), this detected value is sampled at predetermined intervals, and the change in the detected value obtained by this sampling is greater than a certain value. At times, the number of revolutions of the blower was reduced to reduce the amount of heat exchanged by the heat exchanger, thereby suppressing the high pressure operation of the compressor. In other words, this prevents the compressor from becoming locked or damaged due to high pressure operation.
(ハ) 発明が解決しようとする問題点
以上のような従来の高圧力運転対策では、電流
値を検出するサンプリング周期が短いと、負荷が
一時的に増加した時には保護動作が働くことがあ
り、またサンプリング周期が長い時には電流値の
変化を充分に検出できず保護動作が遅れ圧縮機の
破損をまねくことがあつた。(c) Problems to be solved by the invention In the conventional high-pressure operation countermeasures described above, if the sampling period for detecting the current value is short, a protective operation may be activated when the load temporarily increases. Furthermore, when the sampling period is long, changes in current values cannot be detected sufficiently, resulting in delayed protective action and damage to the compressor.
またこの保護動作は電流値の変化部に基づいて
いるため、過電流が一時的に流れる圧縮機のロツ
ク状態などを充分に検出できないものであつた。 Furthermore, since this protective operation is based on the portion where the current value changes, it is not possible to sufficiently detect a locked state of the compressor where an overcurrent temporarily flows.
さらに送風機の回転数を減らしても実際に圧縮
機の圧力が減るまでは所定の遅れ時間を避けるこ
とはできず、この間圧縮機は高圧力運転が維持さ
れるものであつた。 Further, even if the number of rotations of the blower is reduced, a predetermined delay time cannot be avoided until the pressure in the compressor actually decreases, and during this time the compressor remains in high pressure operation.
斯る問題点に鑑み、本発明は圧縮機の高圧力運
転状態を減らし、圧縮機の運転時間を長く確保で
きる空気調和機の保護装置を提供するものであ
る。 In view of these problems, the present invention provides a protection device for an air conditioner that can reduce the high-pressure operating state of the compressor and ensure a longer operating time of the compressor.
(ニ) 問題点を解決するための手段
本発明は負荷の温度と設定温度との差に基づく
能力信号によつて運転能力の変更が可能な圧縮機
を用いた空気調和機の保護装置において、圧縮機
の高圧側の冷媒圧力又は冷媒温度を検出する検出
器と、この検出器の検出値が第１の設定値以上
で、かつ圧縮機に全能力運転の能力信号が与えら
れている間、圧縮機の運転能力を所定能力下げる
運転制御部と、この運転制御部の動作で圧縮機の
運転能力を下げた回数を数えるカウンタ部と、こ
のカウンタ部の計数値が所定数以上となつた時、
前記運転制御部による圧縮機の運転能力の低下動
作を阻止するマスク部と、前記検出器の検出値が
第１の設定値より高い第２の設定値以上となつた
時、圧縮機の運転を停止する高圧力運転保護部と
を備えたものである。(d) Means for solving the problem The present invention provides a protection device for an air conditioner using a compressor whose operating capacity can be changed by a capacity signal based on the difference between the load temperature and the set temperature. a detector for detecting refrigerant pressure or refrigerant temperature on the high-pressure side of the compressor; and while the detected value of the detector is equal to or higher than a first set value and a capability signal for full capacity operation is given to the compressor; An operation control unit that reduces the operating capacity of the compressor to a predetermined capacity, a counter unit that counts the number of times the operating capacity of the compressor is lowered by the operation of the operation control unit, and when the count value of the counter unit reaches a predetermined number or more. ,
a mask unit that prevents the operation control unit from reducing the operating capacity of the compressor; and a mask unit that prevents the compressor from operating when the detected value of the detector exceeds a second set value that is higher than the first set value. It is equipped with a high-pressure operation protection section that stops the operation.
(ホ) 作用
このように構成された本発明の保護装置は、圧
縮機が高圧力運転となつた時は圧縮機の運転能力
を低下させて圧縮機の保護を行なうものである。(E) Function The protection device of the present invention configured as described above protects the compressor by lowering the operating capacity of the compressor when the compressor is operated at high pressure.
(ヘ) 実施例
以下本発明の実施例を図面に基づいて説明す
る。第１図は本発明の保護装置を用いる概略図で
あり、１は運転能力可変型の圧縮機であり、制御
装置２からの能力信号によつて運転能力が０％
（運転停止），25％，50％，75％，100％の５段階
に変わるものである。３，４，５が夫々凝縮器、
減圧器、蒸発器であり、冷媒配管で環状に接続さ
れて冷凍サイクルを構成している。凝縮器３には
制御装置２からの信号で運転が制御される送風機
６が設けられている。蒸発器５は水熱交換器７で
ブラインの冷却を行なう。８はポンプであり、冷
却されたブラインを被調和室へ循環させるもので
ある。またこのポンプ８は制御装置２によつて制
御されている。(f) Examples Examples of the present invention will be described below based on the drawings. FIG. 1 is a schematic diagram of the use of the protection device of the present invention, in which 1 is a compressor with variable operating capacity, and the operating capacity is set to 0% by the capacity signal from the control device 2.
(operation stop), 25%, 50%, 75%, and 100%. 3, 4, and 5 are condensers, respectively.
They are a pressure reducer and an evaporator, and are connected in a ring with refrigerant piping to form a refrigeration cycle. The condenser 3 is provided with a blower 6 whose operation is controlled by signals from the control device 2 . The evaporator 5 cools the brine with a water heat exchanger 7. A pump 8 circulates the cooled brine to the conditioned chamber. Further, this pump 8 is controlled by a control device 2.
９，１０，１１は夫々冷却後のブラインの温度
を検出する温度検出器、圧縮機１の吸込み側の冷
媒圧力を検出する低圧圧力検出器、圧縮機１の吐
出側の冷媒圧力を検出する高圧圧力検出器であ
り、夫々の検出値を制御装置２が入力する。 9, 10, and 11 are temperature detectors that detect the temperature of the brine after cooling, a low-pressure pressure detector that detects the refrigerant pressure on the suction side of the compressor 1, and a high-pressure detector that detects the refrigerant pressure on the discharge side of the compressor 1, respectively. It is a pressure detector, and the control device 2 inputs each detected value.
制御部２は主にマイクロプロセツサからなり以
下の機能を有している。温度検出器９の検出値に
基づいて圧縮機１の運転能力を定める能力信号を
出力する信号出力部と、高圧圧力検出器１１の検
出値が第１の設定値以上で、かつ圧縮機１へ100
％運転の能力信号が出ている時に圧縮機１の運転
能力を75％とする第１運転制御部と、この運転制
御部の動作で圧縮機１の運転能力が100％から75
％に下つた回数をカウントする第１カウンタ部
と、このカウンタ部の計数値が所定数（10回に設
定）以上となつた時に運転制御部による圧縮機の
運転能力の低下動作を阻止する第１マスク部と、
高圧圧力検出器１１の検出値が第１の設定値より
高い第２設定値以上となつた時に圧縮機１の運転
を停止し、かつ警報を出力する高圧力運転保護部
と、低圧圧力検出器１０の検出値が第３の設定値
以下で、かつ圧縮機１へ25％運転の能力信号が出
ている時に圧縮機１の運転能力を50％とする第２
運転制御部と、この運転制御部の動作で圧縮機１
の運転能力が25％から50％に上つた回数をカウン
トする第２カウンタ部と、このカウンタ部の計数
値が所定数（10回に設定）以上となつた時に運転
制御部による圧縮機の運転能力の低下動作を阻止
する第２マスク部と、低圧圧力検出器１０の検出
値が第３の設定値より低い第４設定値以下となつ
た時に圧縮機１の運転を停止し、かつ警報を出力
する低圧力運転保護部との機能を有している。 The control section 2 mainly consists of a microprocessor and has the following functions. A signal output section that outputs a capability signal that determines the operating capability of the compressor 1 based on the detected value of the temperature detector 9; 100
A first operation control unit that sets the operating capacity of the compressor 1 to 75% when the % operation capacity signal is output, and the operation of this operation control unit changes the operating capacity of the compressor 1 from 100% to 75%.
%, and a second counter that prevents the operation control unit from reducing the operating capacity of the compressor when the counted value of this counter exceeds a predetermined number (set to 10 times). 1 mask part,
A high-pressure operation protection unit that stops the operation of the compressor 1 and outputs an alarm when the detected value of the high-pressure pressure detector 11 exceeds a second set value that is higher than the first set value, and a low-pressure pressure detector. 10 is below the third set value and a 25% operation capacity signal is output to the compressor 1, the second setting sets the operating capacity of the compressor 1 to 50%.
The operation control unit and the operation of the operation control unit control the compressor 1.
A second counter section counts the number of times the operating capacity of the compressor increases from 25% to 50%, and when the counted value of this counter section exceeds a predetermined number (set to 10 times), the operation control section controls the operation of the compressor. A second mask part that prevents the performance from decreasing, and a second mask part that stops the operation of the compressor 1 and issues an alarm when the detected value of the low-pressure pressure detector 10 becomes equal to or less than a fourth set value that is lower than the third set value. It has the function of output low pressure operation protection section.
第２図はこれらの機能を実現するための要部フ
ローチヤートであり以下のようになつている。ま
ずブラインの温度Ｔ、高圧圧力PH、低圧圧力PL
の値を夫々温度検出器９、高圧圧力検出器１１、
低圧圧力検出器１０から入力する。第１の設定値
を22Kg／m2、第２の設定値を28Kg／m2、第３の設
定値を３Kg／m2、第４の設定値を２Kg／m2として
いるが、これらの設定値はこれに限るものではな
く圧縮機１の最大能力、循環するブラインの量、
凝縮器３又は蒸発器５の熱交換量に基づいて設定
すればよい。高圧検出値PH、低圧検出値PLに異
常がない時は温度検出値Ｔに基づいて圧縮機１の
運転能力を100％，75％，50％，25％，０％（停
止）に制御するものである。また高圧検出値PH、
低圧検出値PLが第１又は第３の設定値を越えた
時はフラグＦ及び変数Ｎを用いて圧縮機１の運転
能力が100％から75％又は25％から50％に変化す
る回数をカウントする。尚この変数Ｎは温度検出
値Ｔに基づいて設定される能力信号が75％又は50
％となつた時に“Ｎ＝０”にクリアされる。この
変数Ｎの値が“Ｎ≧10”となつた時には温度検出
値Ｔに基づいて設定された能力信号で圧縮機１の
運転を行なう。（能力信号の変更を行なわない。）
また高圧検出値PH、低圧検出値PLが第２又は第
３の設定値を越えると異常状態と判断し、圧縮機
１の運転を停止すると共に警報を出力して対応を
促すものである。 FIG. 2 is a flowchart of the main parts for realizing these functions, and is as follows. First, the brine temperature T, high pressure P H , low pressure P L
The values of the temperature detector 9, high pressure detector 11,
Input from the low pressure pressure detector 10. The first setting value is 22Kg/m 2 , the second setting value is 28Kg/m 2 , the third setting value is 3Kg/m 2 , and the fourth setting value is 2Kg/m 2 . Values include, but are not limited to, the maximum capacity of compressor 1, the amount of circulating brine,
It may be set based on the heat exchange amount of the condenser 3 or the evaporator 5. When there is no abnormality in the high pressure detection value P H and low pressure detection value P L , the operating capacity of the compressor 1 is controlled to 100%, 75%, 50%, 25%, 0% (stop) based on the temperature detection value T. It is something to do. Also, the high pressure detection value P H ,
When the low pressure detection value P L exceeds the first or third set value, the flag F and variable N are used to calculate the number of times the operating capacity of the compressor 1 changes from 100% to 75% or from 25% to 50%. Count. This variable N is set when the capacity signal set based on the temperature detection value T is 75% or 50%.
%, it is cleared to "N=0". When the value of this variable N becomes "N≧10", the compressor 1 is operated with the capacity signal set based on the detected temperature value T. (Do not change the capability signal.)
Furthermore, when the high pressure detection value P H and the low pressure detection value PL exceed the second or third set value, it is determined that an abnormal condition has occurred, and the operation of the compressor 1 is stopped and an alarm is output to prompt a response. .
このように構成された保護装置を有する空気調
和機の実際の運転状態例を第３図に示す。区間t0
では高圧検出値PHが“PH＜22Kg／m2”なので温
度検出値Ｔに基づいて圧縮機１の運転能力が変更
されるものである。区間t1（外気温の上昇又は送
風機６の故障などで凝縮器３の熱交換量が少なく
なつた時）では最初に高圧検出値PHが“PH≧22
Kg／m2”となつた時から運転制御部が動作して圧
縮機１の運転能力を100％から75％に変える。運
転能力が75％となると圧縮機１の吐出圧力も低く
なるので高圧検出値PHの値も小さくなり、この
検出値が“PH＜22Kg／m2”となると再び100％の
運転能力となる。この時、凝縮器３の熱交換量が
正常量に戻れば高圧検出値PHの値が高くならず
区間t0と同様な通常運転を行なう。高圧検出値PH
の値が下がらず再度運転能力を100％から75％に
変える動作を10回繰り返すと、次に高圧検出値
PHが“PH≧22Kg／m2”となつても運転能力の変
更を行なわない。従つて区間t2では高圧検出値PH
がさらに上昇し、“PH≧28Kg／m2”となれば圧縮
機１の運転が停止する。（区間t3）これによつて
冷凍サイクル中の高圧圧力が異常に高くなり圧縮
機１が破損するのを防止できる。 FIG. 3 shows an example of an actual operating state of an air conditioner having a protection device configured as described above. interval t 0
Since the detected high pressure value P H is "P H <22 Kg/m 2 ", the operating capacity of the compressor 1 is changed based on the detected temperature value T. In section t 1 (when the heat exchange amount of the condenser 3 decreases due to a rise in outside temperature or a failure of the blower 6), the high pressure detection value P H initially becomes “P H ≧22
Kg/m 2 ", the operation control section operates and changes the operating capacity of the compressor 1 from 100% to 75%. When the operating capacity reaches 75%, the discharge pressure of the compressor 1 also decreases, so the high pressure The value of the detected value P H also becomes smaller, and when this detected value becomes "P H <22Kg/m 2 ", the operating capacity becomes 100% again.At this time, if the heat exchange amount of the condenser 3 returns to the normal amount. The value of high pressure detection value P H does not increase and normal operation is performed as in section t 0. High pressure detection value P H
If the value does not decrease and the operation of changing the operating capacity from 100% to 75% is repeated 10 times, the next high pressure detection value
Even if P H becomes “P H ≧22Kg/m 2 ”, the operating capacity will not be changed. Therefore, in the interval t2, the high pressure detection value P H
increases further and becomes "P H ≧28 Kg/m 2 ", the operation of the compressor 1 is stopped. (Section t 3 ) This can prevent the compressor 1 from being damaged due to abnormally high high pressure in the refrigeration cycle.
また第４図は低圧検出値PLが異常低下した時
の運転状態を示す説明図である。区間t4では低圧
検出値PLが“PL＞３Kg／m2”なので温度検出値
Ｔに基づいて圧縮機１の運転能力が変更されるも
のである。区間t5（外気温の下降または負荷が減
つて凝縮器３の熱交換量が多くなつた時）では、
最初に低圧検出値PLが“PL≦３Kg／m2”となつ
た時から運転制御部が動作して圧縮機１の運転能
力を25％から50％に変える。運転能力が50％とな
ると圧縮機１の吐出圧力が上昇し、同時に圧縮機
１の吸い込み側の低圧検出値PLも高くなる。こ
の検出値が“PL≦３Kg／m2”となると再び25％
の運転能力となる。この時、凝縮器３の熱交換量
が正常量となれば低圧検出値PLの値が低くなら
ず区間t4と同様な通常運転を行なう。低圧検出値
PLの値が上がらず再度運転能力を25％から50％
に変える動作を10回繰り返すと、次に低圧検出値
PLが“PL≦３Kg／m2”となつても運転能力の変
更を行なわない。従つて区間t6では低圧検出値PL
がさらに下降し、“PL≦２Kg／m2”となれば圧縮
機１の運転が停止する。（区間t3）これによつて、
冷凍サイクル中の低圧圧力の異常低下が無くな
り、圧縮機１への液戻りの防止が行なえると共に
圧縮機へのオイル戻りを良くできオイル不足によ
る圧縮機１の破損を防止できる。 Further, FIG. 4 is an explanatory diagram showing the operating state when the detected low pressure value P L has abnormally decreased. In the section t4 , the low pressure detection value P L is "P L > 3 Kg/m 2 ", so the operating capacity of the compressor 1 is changed based on the temperature detection value T. In section t 5 (when the outside temperature drops or the load decreases and the amount of heat exchanged by the condenser 3 increases),
When the low pressure detection value P L first becomes "P L ≦3Kg/m 2 ", the operation control section operates and changes the operating capacity of the compressor 1 from 25% to 50%. When the operating capacity reaches 50%, the discharge pressure of the compressor 1 increases, and at the same time, the low pressure detection value P L on the suction side of the compressor 1 also increases. When this detected value becomes “P L ≦3Kg/m 2 ”, it becomes 25% again.
driving ability. At this time, if the heat exchange amount of the condenser 3 becomes a normal amount, the low pressure detection value PL will not decrease and normal operation similar to section t4 will be performed. Low pressure detection value
The P L value does not increase and the operating capacity is increased from 25% to 50% again.
10 times, the next low pressure detection value
Even if P L becomes “ PL ≦3Kg/m 2 ”, the operating capacity will not be changed. Therefore, in the interval t 6 , the low pressure detection value P L
further decreases, and when "P L ≦2Kg/m 2 ", the operation of the compressor 1 is stopped. (Interval t 3 ) With this,
Abnormal drop in low pressure during the refrigeration cycle is eliminated, liquid returning to the compressor 1 can be prevented, and oil can be returned to the compressor well, thereby preventing damage to the compressor 1 due to oil shortage.
尚、上記実施例では圧力の検出に圧力検出器を
用いているが、冷媒圧力と冷媒温度とが密接に関
係する点に着目し、冷媒圧力に換つて冷媒温度を
検出するようにしてもよい。また、制御装置をマ
イコンを用いて構成しているが、上記の機能を有
するデイスクリート回路で構成してもよい。さら
に圧縮機の運転能力を０％，25％……100％と段
階的に変えているが連続的に変えるようにしても
よい。 In the above embodiment, a pressure detector is used to detect the pressure, but the refrigerant temperature may be detected instead of the refrigerant pressure, focusing on the fact that the refrigerant pressure and the refrigerant temperature are closely related. . Furthermore, although the control device is configured using a microcomputer, it may also be configured using a discrete circuit having the above functions. Further, although the operating capacity of the compressor is changed stepwise from 0%, 25%...100%, it may be changed continuously.
(ト) 発明の効果
本発明は温度変化に基づく能力信号によつて運
転能力の変更が可能な圧縮機を用いた空気調和機
の保護装置において、圧縮機の冷媒圧力又は冷媒
温度を検出する検出器と、この検出器の検出値が
第１の設定値以上で、かつ圧縮機に全能力運転の
能力信号が与えられている間、圧縮機の運転能力
を所定能力下げる運転制御部と、この運転制御部
の動作で圧縮機の運転能力を下げた回数を数える
カウンタ部と、このカウンタ部の計数値が所定数
以上となつた時、前記運転制御部による圧縮機の
運転能力の低下動作を阻止するマスク部と、前記
検出器の検出値が第１の設定値より高い第２の設
定値以上となつた時、圧縮機の運転を停止する高
圧力運転保護部とを備えたので、冷凍サイクル内
の高圧圧力が高くなるような異常状態でも、まず
は圧縮機の運転能力を下げて高圧圧力を下げ高圧
力運転保護部の動作を一時的に抑制する。この運
転能力を下げる動作を行なつている間、圧縮機の
運転を維持することができ圧縮機の運転時間を長
く確保できる。この間に異常状態が復帰しなけれ
ば高圧力運転保護部が動作して圧縮機の保護が行
なえるものである。(G) Effects of the Invention The present invention provides a protection device for an air conditioner using a compressor whose operating capacity can be changed by a capacity signal based on a temperature change. an operation control unit that reduces the operating capacity of the compressor to a predetermined capacity while the detected value of the detector is equal to or higher than a first set value and a capacity signal for full capacity operation is given to the compressor; a counter unit that counts the number of times the operating capacity of the compressor is lowered by the operation of the operation control unit; and when the count value of this counter unit exceeds a predetermined number, the operation control unit controls the operation of reducing the operating capacity of the compressor. Since it is equipped with a mask section that prevents refrigeration, and a high pressure operation protection section that stops the operation of the compressor when the detected value of the detector exceeds a second set value that is higher than the first set value, Even in an abnormal situation where the high pressure in the cycle increases, the compressor's operating capacity is first lowered to lower the high pressure and the operation of the high pressure operation protection section is temporarily suppressed. While this operation to lower the operating capacity is performed, the compressor can continue to operate, and the compressor can be operated for a long time. If the abnormal condition does not return during this period, the high pressure operation protection section operates to protect the compressor.
第１図は本発明の実施例を用いる空気調和機の
概略図、第２図は第１図に示した制御部の主なフ
ローチヤート、第３図は高圧異常時の動作を示す
説明図、第４図は低圧異常時の動作を示す説明図
である。
１……圧縮機、２……制御装置、３……凝縮
器、１０……低圧圧力検出器、１１……高圧圧力
検出器。
FIG. 1 is a schematic diagram of an air conditioner using an embodiment of the present invention, FIG. 2 is a main flowchart of the control section shown in FIG. 1, and FIG. 3 is an explanatory diagram showing the operation at the time of high pressure abnormality. FIG. 4 is an explanatory diagram showing the operation at the time of low pressure abnormality. DESCRIPTION OF SYMBOLS 1... Compressor, 2... Control device, 3... Condenser, 10... Low pressure pressure detector, 11... High pressure pressure detector.
Claims (1)
号によつて運転能力の変更が可能な圧縮機を用い
た空気調和機の保護装置において、圧縮機の高圧
側の冷媒圧力又は冷媒温度を検出する検出器と、
この検出器の検出値が第１の設定値以上で、かつ
圧縮機に全能力運転の能力信号が与えられている
間、圧縮機の運転能力を所定能力低下させる運転
制御部と、この運転制御部の動作で圧縮機の運転
能力を下げた回数を数えるカウンタ部と、このカ
ウンタ部の計数値が所定数以上となつた時、前記
運転制御部による圧縮機の運転能力の低下動作を
阻止するマスク部と、前記検出器の検出値が第１
の設定値より高い第２の設定値以上となつた時、
圧縮機の運転を停止する高圧力運転保護部とを備
えたことを特徴とする空気調和機の保護装置。1. In a protection device for an air conditioner using a compressor whose operating capacity can be changed by a capacity signal based on the difference between the load temperature and the set temperature, the refrigerant pressure or refrigerant temperature on the high pressure side of the compressor is detected. a detector that
an operation control unit that reduces the operating capacity of the compressor by a predetermined capacity while the detected value of the detector is equal to or higher than a first set value and a capacity signal for full capacity operation is given to the compressor; a counter unit that counts the number of times the operating capacity of the compressor is lowered by the operation of the unit; and when the count value of this counter unit exceeds a predetermined number, the operation control unit prevents the operating capacity of the compressor from being lowered. The mask part and the detection value of the detector are the first
When the value exceeds the second set value, which is higher than the set value of
1. A protection device for an air conditioner, comprising: a high-pressure operation protection section that stops operation of a compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61274655A JPS63129250A (en) | 1986-11-18 | 1986-11-18 | Protective device for air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61274655A JPS63129250A (en) | 1986-11-18 | 1986-11-18 | Protective device for air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63129250A JPS63129250A (en) | 1988-06-01 |
| JPH0535334B2 true JPH0535334B2 (en) | 1993-05-26 |
Family
ID=17544715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61274655A Granted JPS63129250A (en) | 1986-11-18 | 1986-11-18 | Protective device for air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63129250A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4594552B2 (en) * | 2001-05-22 | 2010-12-08 | Ｔｏｔｏ株式会社 | Bathroom drying equipment |
| JP3948432B2 (en) | 2003-05-16 | 2007-07-25 | 株式会社豊田自動織機 | Control device for variable capacity compressor |
| JP5446348B2 (en) * | 2009-03-17 | 2014-03-19 | ダイキン工業株式会社 | Air conditioner |
| JP6324707B2 (en) | 2013-11-13 | 2018-05-16 | 三菱重工サーマルシステムズ株式会社 | Heat source machine and control method thereof |
| JP2021080966A (en) * | 2019-11-15 | 2021-05-27 | 大陽日酸株式会社 | Helium gas recovery device and gas compression method |
-
1986
- 1986-11-18 JP JP61274655A patent/JPS63129250A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63129250A (en) | 1988-06-01 |
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