JP3440770B2 - Control device for electric expansion valve - Google Patents
Control device for electric expansion valveInfo
- Publication number
- JP3440770B2 JP3440770B2 JP19587097A JP19587097A JP3440770B2 JP 3440770 B2 JP3440770 B2 JP 3440770B2 JP 19587097 A JP19587097 A JP 19587097A JP 19587097 A JP19587097 A JP 19587097A JP 3440770 B2 JP3440770 B2 JP 3440770B2
- Authority
- JP
- Japan
- Prior art keywords
- electric expansion
- expansion valve
- signal
- state
- sensor
- 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)
- Indication Of The Valve Opening Or Closing Status (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、冷凍装置におけ
る電動膨張弁の制御装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an electric expansion valve in a refrigeration system.
【０００２】[0002]
【従来の技術】冷凍装置の減圧器として電動膨張弁を用
いた際に、スラッジ等により電動膨張弁に詰まりが生じ
ることがある。詰まりが生じると最適な減圧量が得られ
なくなる。特に、ＨＦＣ系冷媒と合成油（エステル油、
エーテル油等）とを組み合わせて使用する場合に、スラ
ッジが生じ易くなり、電動膨張弁の詰まりが起こりやす
くなる。2. Description of the Related Art When an electric expansion valve is used as a decompressor for a refrigeration system, the electric expansion valve may be clogged with sludge or the like. If clogging occurs, the optimum pressure reduction amount cannot be obtained. In particular, HFC refrigerants and synthetic oils (ester oils,
When used in combination with (such as ether oil), sludge is likely to be generated, and the electric expansion valve is easily clogged.
【０００３】吐出管温度を検知して開度調節をしている
場合に、上記電動膨張弁の詰まりが発生すると、最適開
度に達するまでの立ち上がり速度の遅れや快適性の低減
が起こる。また、吐出管の温度を検知することなく、Ｃ
ＰＵからの指示のみで、開度を設定する場合に、上記詰
まりが発生すると過熱運転となり、最悪の場合はシステ
ムダウンに至りサービスコール，クレームの多発を招
く。When the electric expansion valve is clogged while the discharge pipe temperature is detected and the opening is adjusted, the rise speed is delayed until the optimum opening is reached and comfort is reduced. In addition, without detecting the temperature of the discharge pipe, C
When the opening is set only by the instruction from the PU, the above-mentioned clogging causes overheat operation, and in the worst case, the system goes down, resulting in frequent service calls and complaints.
【０００４】[0004]
【発明が解決しようとする課題】そこで、この発明の目
的は、電動膨張弁の動作不良を早期検知して対処するこ
とができる電動膨張弁の制御装置を提供することにあ
る。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a control device for an electric expansion valve, which can detect a malfunction of the electric expansion valve at an early stage and deal with it.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するた
め、請求項１の発明の電動膨張弁の制御装置は、冷凍装
置の状態を検出して、状態信号を出力する状態センサ
と、電動膨張弁に弁開度を変える操作信号を出力する前
に上記状態センサが出力した前状態信号と上記電動膨張
弁に上記操作信号を出力した後に上記状態センサが出力
した後状態信号とを比較して、上記前状態信号と後状態
信号との差が所定のしきい値を越えたか否かを判断する
判断手段と、上記判断手段が上記差が所定のしきい値を
越えていないと判断したときに、上記電動膨張弁の動作
不良に対処する所定の処置を行なう一方、上記判断手段
が上記差が所定のしきい値を越えたと判断したときに、
上記所定の処置を行なわない処置手段とを備え、上記処
置手段は、上記所定の処置として、冷凍回路の過負荷を
回避する処置を行なう回避手段を有し、 上記状態センサ
は、圧縮機の吐出管の温度を検出する吐出管温度センサ
と、上記圧縮機の駆動電流を検出する電流センサであ
り、上記状態信号は上記吐出管温度センサからの温度信
号と上記電流センサからの電流信号であることを特徴と
している。In order to achieve the above object, a control device for an electric expansion valve according to the invention of claim 1 detects a state of a refrigerating device and outputs a state signal, and an electric expansion valve. Before outputting the operation signal for changing the valve opening to the valve, the pre-status signal output by the status sensor is compared with the post-status signal output by the status sensor after outputting the operation signal to the electric expansion valve. Determining means for determining whether the difference between the front state signal and the rear state signal exceeds a predetermined threshold value, and the determining means determines that the difference does not exceed the predetermined threshold value. On the other hand, when the predetermined measure for coping with the malfunction of the electric expansion valve is taken, while the judging means judges that the difference exceeds the predetermined threshold value,
And a treatment means not performing the predetermined treatment, the treatment unit, as the predetermined treatment, have a avoidance means for treatment to avoid overloading of the refrigeration circuit, the state sensor
Is a discharge pipe temperature sensor that detects the temperature of the discharge pipe of the compressor.
And a current sensor that detects the drive current of the compressor
The status signal from the discharge pipe temperature sensor.
And a current signal from the current sensor .
【０００６】この請求項１の発明は、上記状態センサが
上記冷凍装置の状態を検出する。According to the first aspect of the invention, the state sensor detects the state of the refrigerating apparatus.
【０００７】そして、上記判断手段は、上記操作信号の
出力後に状態センサが出力した後状態信号が、上記操作
信号を出力する前に状態センサが出力した前状態信号か
ら、上記しきい値を越えて変化したか否かを判断する。
そして、上記後状態信号が前状態信号から上記しきい値
を越えて変化したと判断手段が判断すると、上記処置手
段は、所定の処置を行なわない。一方、上記後状態信号
が前状態信号から上記しきい値を越えて変化しなかった
と判断手段が判断すると、上記処置手段は、上記電動膨
張弁の動作不良に対処する所定の処置を行なう。Then, the determining means determines that the post-state signal output by the state sensor after the output of the operation signal exceeds the threshold value from the pre-state signal output by the state sensor before outputting the operation signal. To determine whether it has changed.
When the determining means determines that the rear state signal has changed from the front state signal by exceeding the threshold value, the treatment means does not perform the predetermined treatment. On the other hand, when the determining means determines that the post-state signal has not changed from the pre-state signal by more than the threshold value, the treating means takes a predetermined action to cope with the malfunction of the electric expansion valve.
【０００８】上記後状態信号と上記前状態信号との差が
上記しきい値を越えていないときには、電動膨張弁の弁
開度が上記操作信号にしたがうように変化しなかったと
いうことであり、電動膨張弁が動作不良を起こしている
ということである。一方、上記信号差が上記しきい値を
越えているときには、上記電動膨張弁の弁開度が上記操
作信号にしたがうように変化したということである。When the difference between the rear state signal and the front state signal does not exceed the threshold value, it means that the valve opening degree of the electric expansion valve did not change according to the operation signal. This means that the electric expansion valve is malfunctioning. On the other hand, when the signal difference exceeds the threshold value, it means that the valve opening degree of the electric expansion valve has changed according to the operation signal.
【０００９】したがって、この発明によれば、上記後状
態信号と前状態信号とを状態センサで検知して、上記両
信号の差が上記しきい値を越えたか否かを判断手段で判
断することによって、電動膨張弁が動作不良を起こして
いるか否かを速やかに検知できる。また、上記判断手段
が電動膨張弁が動作不良を起こしていると判断したとき
に、上記処置手段で上記電動膨張弁の動作不良に対処す
る所定処置を行なうことができる。したがって、この発
明によれば、電動膨張弁の動作不良を早期検知して対処
することができる。Therefore, according to the present invention, the state sensor detects the rear state signal and the front state signal, and the determination means determines whether or not the difference between the two signals exceeds the threshold value. Thus, it is possible to quickly detect whether or not the electric expansion valve is malfunctioning. Further, when the determination means determines that the electric expansion valve is malfunctioning, the treatment means can take a predetermined action to cope with the malfunction of the electric expansion valve. Therefore, according to the present invention, a malfunction of the electric expansion valve can be early detected and dealt with.
【００１０】また、請求項１の発明の電動膨張弁の制御
装置では、上記判断手段が上記信号差が上記しきい値を
越えておらず、電動膨張弁が動作不良を起こしたと判断
したときに、上記処置手段が冷凍回路の過負荷を回避す
る処置を行なう。したがって、冷凍回路の動作不具合を
事前に回避できる。Further, in the control device for the electric expansion valve according to the invention of claim 1, when the judgment means judges that the signal difference does not exceed the threshold value and the electric expansion valve malfunctions. The above-mentioned treatment means performs a treatment for avoiding the overload of the refrigeration circuit. Therefore, a malfunction of the refrigeration circuit can be avoided in advance.
【００１１】また、請求項２の発明は、請求項１に記載
の電動膨張弁の制御装置において、上記処置手段は、上
記所定の処置として、警報を行なう警報手段を有するこ
とを特徴としている。According to a second aspect of the invention, in the electric expansion valve control device according to the first aspect, the treatment means is
As a prescribed measure, it is characterized by having an alarm means for issuing an alarm .
【００１２】この請求項２の発明は、上記判断手段が上
記信号差が上記しきい値を越えておらず、電動膨張弁が
動作不良を起こしたと判断したときに、上記処置手段が
有する警報手段が電動膨張弁の不具合を警告する警報を
発する。これにより、電動膨張弁の不具合に起因して故
障の状況が広がらないように、部品交換，修理などの対
応処置を行なえる。According to the second aspect of the present invention, when the determination means determines that the signal difference does not exceed the threshold value and the electric expansion valve has malfunctioned, the treatment means is provided.
The alarm means included therein issues an alarm that warns of a malfunction of the electric expansion valve. As a result, countermeasures such as parts replacement and repair can be taken so that the failure situation does not spread due to the malfunction of the electric expansion valve.
【００１３】[0013]
【発明の実施の形態】以下、この発明を図示の実施の形
態により詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings.
【００１４】図１に、この発明の電動膨張弁の制御装置
の実施の形態を含む冷凍装置の冷凍回路を示す。この冷
凍回路は、第１熱交換器１と第２熱交換器２と圧縮機３
と四路切換弁５と電動膨張弁６とを備えている。FIG. 1 shows a refrigerating circuit of a refrigerating apparatus including an embodiment of a control device for an electric expansion valve of the present invention. This refrigeration circuit includes a first heat exchanger 1, a second heat exchanger 2, and a compressor 3.
And a four-way switching valve 5 and an electric expansion valve 6.
【００１５】この実施の形態の電動膨張弁の制御装置
は、圧縮機３の吐出管３ａの温度を検出する吐出管温度
センサ７と、圧縮機３の駆動電流を検出する電流センサ
８と、上記吐出管温度センサ７からの温度信号と上記電
流センサ８からの電流信号とが入力される制御装置１０
を有する。この制御装置１０は、上記温度信号と電流信
号とに基づいて、上記電動膨張弁６の弁開度を制御す
る。上記吐出管温度センサ７と電流センサ８とが冷凍装
置の状態を検出する状態センサをなす。The control device for the electric expansion valve of this embodiment includes a discharge pipe temperature sensor 7 for detecting the temperature of the discharge pipe 3a of the compressor 3, a current sensor 8 for detecting the drive current of the compressor 3, and the above-mentioned. A control device 10 to which the temperature signal from the discharge pipe temperature sensor 7 and the current signal from the current sensor 8 are input.
Have. The control device 10 controls the valve opening degree of the electric expansion valve 6 based on the temperature signal and the current signal. The discharge pipe temperature sensor 7 and the current sensor 8 form a state sensor that detects the state of the refrigeration system.
【００１６】図２に、上記電動膨張弁６の構造を示す。
この電動膨張弁６は、ロータ１１とステータ１２が構成
するステップモータを有し、このロータ１１に固定され
ロータ１１の回転軸を中心軸とするネジ弁１３を有して
いる。そして、上記ステータ１２は本体１５に固定され
ている。また、この本体１５に形成されたネジ穴１６に
上記ネジ弁１３が螺合されている。また、上記本体１５
は、上記ネジ穴１６に対向する位置に上記ネジ弁１３の
先端テーパ面１３ａに対向するテーパ面１７ａを有する
弁孔１７を有する。この弁孔１７には継手管２０が固定
され、上記本体１５に上記回転軸に直交する方向に穿た
れた孔２１に別の継手管２２が固定されている。FIG. 2 shows the structure of the electric expansion valve 6.
The electric expansion valve 6 has a step motor composed of a rotor 11 and a stator 12, and has a screw valve 13 fixed to the rotor 11 and having a rotation axis of the rotor 11 as a central axis. The stator 12 is fixed to the main body 15. The screw valve 13 is screwed into a screw hole 16 formed in the main body 15. Also, the main body 15
Has a valve hole 17 having a tapered surface 17a facing the tip tapered surface 13a of the screw valve 13 at a position facing the screw hole 16. A joint pipe 20 is fixed to the valve hole 17, and another joint pipe 22 is fixed to a hole 21 formed in the main body 15 in a direction orthogonal to the rotation axis.
【００１７】上記構成の電動膨張弁６は、上記ステータ
１２に入力されるパルス数によって、ロータ１１の回転
量が決まり、この回転量によって、ネジ弁１３の先端テ
ーパ面１３ａと対向するテーパ面１７ａとの距離が制御
されて、弁開度が制御される。In the electric expansion valve 6 having the above-mentioned structure, the rotation amount of the rotor 11 is determined by the number of pulses input to the stator 12, and the rotation amount determines the taper surface 17a facing the tip taper surface 13a of the screw valve 13. And the valve opening are controlled.
【００１８】次に、図３のフローチャートを参照しなが
ら、この実施形態の電動膨張弁の制御装置の動作を説明
する。Next, the operation of the control device for the electric expansion valve of this embodiment will be described with reference to the flowchart of FIG.
【００１９】まず、電動膨張弁６の制御がスタートする
と、ステップＳ１に進み、制御装置１０は、吐出管温度
センサ７からの温度信号と電流センサ８からの電流信号
を記憶する。この温度信号と電流信号とが前状態信号で
ある。この前状態信号によって、吐出管３ａの温度と圧
縮機３を駆動する駆動電流とが分かる。次に、ステップ
Ｓ２に進み、制御装置１０は上記吐出管温度と駆動電流
とに基づいて、上記電動膨張弁６に所定数のパルス信号
を出力する。このパルス信号が操作信号である。First, when the control of the electric expansion valve 6 is started, the process proceeds to step S1, and the control device 10 stores the temperature signal from the discharge pipe temperature sensor 7 and the current signal from the current sensor 8. The temperature signal and the current signal are the previous state signals. From this previous state signal, the temperature of the discharge pipe 3a and the drive current for driving the compressor 3 can be known. Next, in step S2, the control device 10 outputs a predetermined number of pulse signals to the electric expansion valve 6 based on the discharge pipe temperature and the drive current. This pulse signal is the operation signal.
【００２０】次に、ステップＳ３に進み、上記制御装置
１０は、再び、上記吐出管温度センサ７からの温度信号
と電流センサ８からの電流信号とを得る。このときに得
た上記温度信号と上記電流信号とが後状態信号である。
そして、上記制御装置１０は、上記後状態信号と前状態
信号との信号差が、所定のしきい値を越えたか否かを判
断し、上記信号差が上記所定のしきい値を越えたと判断
すれば、ステップＳ４に進み、上記信号差が上記所定の
しきい値を越えていないと判断すれば、ステップＳ５に
進む。Next, in step S3, the control device 10 again obtains the temperature signal from the discharge pipe temperature sensor 7 and the current signal from the current sensor 8. The temperature signal and the current signal obtained at this time are post-state signals.
Then, the control device 10 determines whether the signal difference between the rear state signal and the previous state signal exceeds a predetermined threshold value, and determines that the signal difference exceeds the predetermined threshold value. If so, the process proceeds to step S4, and if it is determined that the signal difference does not exceed the predetermined threshold value, the process proceeds to step S5.
【００２１】上記後状態信号が上記しきい値を越えて変
化したということは、上記電動膨張弁６が入力された操
作信号の通りに正常に動作して弁開度が変化したという
ことである。したがって、この場合、ステップＳ４にす
すんで、次の制御に進む。The change in the post-state signal exceeding the threshold value means that the electric expansion valve 6 is normally operated according to the input operation signal and the valve opening is changed. . Therefore, in this case, the process proceeds to step S4 and proceeds to the next control.
【００２２】一方、上記後状態信号の前状態信号からの
変化が上記しきい値を越えなかったということは、上記
電動膨張弁６が入力された操作信号の通りに正常に動作
せず、弁開度の変化が不十分であったということであ
る。したがって、この場合、ステップＳ５に進んで、電
動膨張弁６の制御を開始してから所定時間が経過するま
での間に、上記ステップＳ２の操作信号出力動作とステ
ップＳ３での後状態信号と前状態信号との差が上記しき
い値以下である判断とを５回以上繰り返したか否かを判
断する。On the other hand, the fact that the change of the post-state signal from the pre-state signal does not exceed the threshold value means that the electric expansion valve 6 does not operate normally according to the input operation signal, This means that the change in opening was insufficient. Therefore, in this case, the process proceeds to step S5, and the operation signal output operation of step S2 described above and the rear state signal of step S3 It is determined whether or not the determination that the difference from the state signal is less than or equal to the threshold value is repeated five times or more.
【００２３】このステップＳ５で、５回以上繰り返した
と判断したときには、ステップＳ６に進んで、電動膨張
弁６の動作に不具合が起こっていることを警報する故障
警報信号を出力する。When it is determined in step S5 that the operation has been repeated five times or more, the process proceeds to step S6, and a failure alarm signal is output to warn that the operation of the electric expansion valve 6 is defective.
【００２４】一方、上記ステップＳ５で、上記操作信号
出力と上記しきい値以下である判断とを５回以上繰り返
していないと判断したときには、ステップＳ２に戻り、
電動膨張弁６に操作信号を再度出力する。On the other hand, when it is determined in step S5 that the operation signal output and the determination of being equal to or less than the threshold value have not been repeated five times or more, the process returns to step S2.
The operation signal is output to the electric expansion valve 6 again.
【００２５】このように、この実施の形態によれば、上
記後状態信号と前状態信号とを状態センサとしての温度
センサ７と電流センサ８で検知して、上記操作信号が出
力されたにもかかわらず、上記前，後状態信号の差が上
記しきい値を越えなかったという判断が５回以上繰り返
されると、電動膨張弁６の不具合を警告する警報を発す
る。As described above, according to this embodiment, the temperature sensor 7 and the current sensor 8 as state sensors detect the rear state signal and the front state signal, and the operation signal is output. Regardless, if the judgment that the difference between the front and rear state signals does not exceed the threshold value is repeated five times or more, an alarm for warning the malfunction of the electric expansion valve 6 is issued.
【００２６】したがって、この実施形態によれば、電動
膨張弁６の単体テストを行なわなくても、電動膨張弁６
の動作不良を簡単，早期に検知して、不具合に対して対
処できる。すなわち、電動膨張弁６の不具合に起因して
故障の状況が広がらないように、部品交換，修理などの
対応処置を早期に行なえる。Therefore, according to this embodiment, the electric expansion valve 6 can be tested without performing a unit test of the electric expansion valve 6.
It is possible to easily and early detect the malfunction of and to deal with the malfunction. That is, it is possible to take an appropriate countermeasure such as parts replacement and repair so that the failure situation does not spread due to the malfunction of the electric expansion valve 6.
【００２７】また、上記しきい値を越えなかったことの
判断が５回以上繰り返されたときにはじめて警報を発す
るので、上記電動膨張弁６の動作不良の検知を信頼性の
高いものにできる。Since the alarm is issued only when the judgment that the threshold value has not been exceeded is repeated five times or more, the malfunction of the electric expansion valve 6 can be detected with high reliability.
【００２８】尚、上記実施の形態では、ステップＳ６で
故障警報を行なったが、ステップＳ６で、制御装置１０
で、圧縮機３を駆動するインバータの周波数を下げた
り、熱交換器への送風ファンの風量を減じたりして、負
荷軽減処置を行なって、冷凍回路の過負荷を回避する処
置を行なってもよい。この場合、冷凍回路の動作不具合
を事前に回避できる。In the above embodiment, the failure alarm is issued in step S6, but in step S6, the control device 10 is activated.
Thus, even if the frequency of the inverter that drives the compressor 3 is lowered, or the air volume of the blower fan to the heat exchanger is reduced, the load is reduced to avoid the overload of the refrigeration circuit. Good. In this case, a malfunction of the refrigeration circuit can be avoided in advance.
【００２９】また、上記実施の形態では、ステップＳ５
での不具合を判断する基準回数を５回にしたが、電動膨
張弁６の不具合判断に適合するような所望の回数に設定
すればよい。In the above embodiment, step S5
Although the reference number of times for determining the failure in (1) is set to 5, the number of times may be set to a desired number suitable for the failure determination of the electric expansion valve 6.
【００３０】また、上記実施の形態では、吐出管３ａの
温度を温度センサ７を状態センサとしたが、電動膨張弁
６に接続された冷媒配管の温度を検出する温度センサを
状態センサとしてもよい。In the above embodiment, the temperature of the discharge pipe 3a is the temperature sensor 7, but the temperature sensor for detecting the temperature of the refrigerant pipe connected to the electric expansion valve 6 may be the state sensor. .
【００３１】[0031]
【発明の効果】以上より明らかなように、請求項１の発
明の電動膨張弁の制御装置は、電動膨張弁に弁開度を変
える操作信号を出力した後に状態センサが出力した後状
態信号と上記操作信号を出力する前に状態センサが出力
した前状態信号とを状態センサで検知して、上記両信号
の差が上記しきい値を越えたか否かを判断手段で判断す
る。この判断によって、電動膨張弁が動作不良を起こし
ているか否かを速やかに検知できる。また、上記判断手
段が電動膨張弁が動作不良を起こしていると判断したと
きに、上記処置手段で上記電動膨張弁の動作不良に対処
する所定処置を行なうことができる。したがって、この
発明によれば、電動膨張弁の動作不良を早期検知して対
処することができる。As is apparent from the above, the control device for the electric expansion valve according to the invention of claim 1 outputs the post-condition signal output by the condition sensor after outputting the operation signal for changing the valve opening degree to the electric expansion valve. Before the operation signal is output, the state sensor detects the previous state signal output by the state sensor, and the determination means determines whether the difference between the two signals exceeds the threshold value. By this determination, it is possible to quickly detect whether or not the electric expansion valve is malfunctioning. Further, when the determination means determines that the electric expansion valve is malfunctioning, the treatment means can take a predetermined action to cope with the malfunction of the electric expansion valve. Therefore, according to the present invention, a malfunction of the electric expansion valve can be early detected and dealt with.
【００３２】また、請求項１の発明は、上記判断手段が
上記信号差が上記しきい値を越えておらず、電動膨張弁
が動作不良を起こしたと判断したときに、上記処置手段
が冷凍回路の過負荷を回避する処置を行なう。したがっ
て、冷凍回路の動作不具合を事前に回避できる。Further, in the invention of claim 1, when the judgment means judges that the signal difference does not exceed the threshold value and the electric expansion valve has malfunctioned, the treatment means causes the refrigeration circuit to operate. Take measures to avoid overload of the. Therefore, a malfunction of the refrigeration circuit can be avoided in advance.
【００３３】また、請求項２の発明は、判断手段が上記
信号差が上記しきい値を越えておらず、電動膨張弁が動
作不良を起こしたと判断したときに、処置手段が有する
警報手段が電動膨張弁の不具合を警告する警報を発す
る。これにより、電動膨張弁の不具合に起因して故障の
状況が広がらないように、部品交換，修理などの対応処
置を行なえる。Further, in the invention of claim 2, when the judging means judges that the signal difference does not exceed the threshold value and the electric expansion valve malfunctions, the treating means has.
The alarm means issues an alarm that warns of a malfunction of the electric expansion valve. As a result, countermeasures such as parts replacement and repair can be taken so that the failure situation does not spread due to the malfunction of the electric expansion valve.
【図１】 この発明の電動膨張弁の制御装置の実施形態
を含む冷凍装置の冷凍回路図である。FIG. 1 is a refrigeration circuit diagram of a refrigeration system including an embodiment of a control device for an electric expansion valve of the present invention.
【図２】 上記実施の形態の電動膨張弁の構造図であ
る。FIG. 2 is a structural diagram of the electric expansion valve of the above embodiment.
【図３】 上記実施形態による制御動作を説明するフロ
ーチャートである。FIG. 3 is a flowchart illustrating a control operation according to the above embodiment.
１…第１熱交換器、２…第２熱交換器、３…圧縮機、５
…四路切換弁、６…電動膨張弁、７…吐出管温度セン
サ、８…電流センサ、１０…制御装置、１１…ロータ、
１２…ステータ、１３…ネジ弁、１５…本体、１６…ネ
ジ穴、１７…弁孔、２０，２２…継手管。1 ... 1st heat exchanger, 2 ... 2nd heat exchanger, 3 ... Compressor, 5
... four-way switching valve, 6 ... electric expansion valve, 7 ... discharge pipe temperature sensor, 8 ... current sensor, 10 ... control device, 11 ... rotor,
12 ... Stator, 13 ... Screw valve, 15 ... Main body, 16 ... Screw hole, 17 ... Valve hole, 20, 22 ... Joint pipe.
フロントページの続き (56)参考文献 特開 平７−55299（ＪＰ，Ａ) 特開 平３−247960（ＪＰ，Ａ) 特開 昭63−6355（ＪＰ，Ａ) 特開 平７−43026（ＪＰ，Ａ)Continued front page (56) Reference JP-A-7-55299 (JP, A) JP-A-3-247960 (JP, A) JP 63-6355 (JP, A) JP-A-7-43026 (JP, A)
Claims (2)
出力する状態センサ（７，８）と、 電動膨張弁（６）に弁開度を変える操作信号を出力する
前に上記状態センサ（７，８）が出力した前状態信号と
上記電動膨張弁（６）に上記操作信号を出力した後に上
記状態センサが出力した後状態信号とを比較して、上記
前状態信号と後状態信号との差が所定のしきい値を越え
たか否かを判断する判断手段（Ｓ３）と、 上記判断手段（Ｓ３）が上記差が所定のしきい値を越え
ていないと判断したときに、上記電動膨張弁（６）の動
作不良に対処する所定の処置を行なう一方、上記判断手
段（Ｓ３）が上記差が所定のしきい値を越えたと判断し
たときに、上記所定の処置を行なわない処置手段（Ｓ
６）とを備え、 上記処置手段は、上記所定の処置として、冷凍回路の過
負荷を回避する処置を行なう回避手段を有し、 上記状態センサは、圧縮機(３)の吐出管(３ａ)の温度を
検出する吐出管温度センサ(７)と、上記圧縮機の駆動電
流を検出する電流センサ(８)であり、上記状態信号は上
記吐出管温度センサ(７)からの温度信号と上記電流セン
サ(８)からの電流信号である ことを特徴とする電動膨張
弁の制御装置。1. A state sensor (7, 8) for detecting a state of a refrigerating apparatus and outputting a state signal, and the state sensor before outputting an operation signal for changing a valve opening to an electric expansion valve (6). The front state signal output from (7, 8) and the rear state signal output from the state sensor after the operation signal is output to the electric expansion valve (6) are compared, and the front state signal and the rear state signal are compared. And a judgment means (S3) for judging whether the difference exceeds a predetermined threshold value, and the judgment means (S3) judges that the difference does not exceed the predetermined threshold value. A predetermined measure is taken against the malfunction of the electric expansion valve (6), while the predetermined measure is not taken when the judgment means (S3) judges that the difference exceeds a predetermined threshold value. Means (S
And a 6), the treatment means, as the predetermined treatment, have a avoidance means for treatment to avoid overloading of the refrigeration circuit, the state sensor, the discharge pipe of the compressor (3) (3a) The temperature of
Discharge pipe temperature sensor (7) to detect and the drive power of the compressor
It is a current sensor (8) that detects the flow, and the above status signal is
The temperature signal from the discharge pipe temperature sensor (7) and the current sensor
A control device for an electric expansion valve, which is a current signal from the controller (8) .
において、 上記処置手段（Ｓ６）は、上記所定の処置として、警報
を行なう警報手段（Ｓ６）を有することを特徴とする電
動膨張弁の制御装置。2. The electric expansion valve control device according to claim 1, wherein the treatment means (S6) has an alarm means (S6) for giving an alarm as the predetermined treatment. Valve controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19587097A JP3440770B2 (en) | 1997-07-22 | 1997-07-22 | Control device for electric expansion valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19587097A JP3440770B2 (en) | 1997-07-22 | 1997-07-22 | Control device for electric expansion valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1137620A JPH1137620A (en) | 1999-02-12 |
| JP3440770B2 true JP3440770B2 (en) | 2003-08-25 |
Family
ID=16348366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19587097A Expired - Fee Related JP3440770B2 (en) | 1997-07-22 | 1997-07-22 | Control device for electric expansion valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3440770B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011158251A (en) * | 2011-04-27 | 2011-08-18 | Mitsubishi Electric Corp | Refrigerator |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS636355A (en) * | 1986-06-25 | 1988-01-12 | 大阪瓦斯株式会社 | Heating or hot-water supply method |
| JPH0799299B2 (en) * | 1990-02-23 | 1995-10-25 | ダイキン工業株式会社 | Compressor superheat control device |
| JPH0743026A (en) * | 1993-07-30 | 1995-02-10 | Sanyo Electric Co Ltd | Freezer device |
| JPH0755299A (en) * | 1993-08-20 | 1995-03-03 | Mitsubishi Electric Corp | Air conditioner |
-
1997
- 1997-07-22 JP JP19587097A patent/JP3440770B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1137620A (en) | 1999-02-12 |
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