JP2005098580A - Controller of cooling device - Google Patents

Controller of cooling device Download PDF

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JP2005098580A
JP2005098580A JP2003331343A JP2003331343A JP2005098580A JP 2005098580 A JP2005098580 A JP 2005098580A JP 2003331343 A JP2003331343 A JP 2003331343A JP 2003331343 A JP2003331343 A JP 2003331343A JP 2005098580 A JP2005098580 A JP 2005098580A
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expansion valve
electric expansion
cooler
control
cooling device
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JP4301908B2 (en
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Masanobu Takeuchi
正信 竹内
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Sanyo Electric Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a controller of a cooling device which directly detects an abnormal point in a control output line to an electric expansion valve, enabling to prevent an crucial state such as insufficient cooling of a cooler. <P>SOLUTION: The cooling device 1 comprises a compressor 2, a condenser 3, an electric expansion valve 4 and a cooler 6 which are sequentially connected by piping circularly. The cooling device 1 is provided with a controller C which controls the electric expansion valve 4 based on the degree of superheat of a refrigerant computed based on outputs of a refrigerant entrance side temperature sensor 10 and a refrigerant exit side temperature sensor 11 of the cooler 6. This controller C has a current detecting circuit 25 as a means for detecting short circuit or disconnection of control output lines 16A, 17A, 18A and 19A or a power supply line 20 to the electric expansion valve 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、低温ショーケースや低温貯蔵庫などに設置される冷却装置、特に、電動膨張弁の制御を行う制御装置に関するものである。   The present invention relates to a cooling device installed in a low-temperature showcase, a low-temperature storage, or the like, and more particularly to a control device that controls an electric expansion valve.

従来より例えば低温ショーケースに採用される冷却装置は、圧縮機、凝縮器、減圧装置及び冷却器等を配管により順次環状に接続して冷媒回路を形成すると共に、この冷媒回路内には所定量の冷媒が封入されて構成されている。そして、圧縮機が運転されると、冷媒は圧縮されて高温高圧のガス状態となり、凝縮器に流入する。凝縮器において冷媒は放熱し、凝縮液化した後、減圧装置にて減圧され、冷却器に供給される。冷却器内においては減圧された後の液冷媒が蒸発し、そのときに周囲から吸熱することにより冷却作用を発揮するものである。   Conventionally, for example, a cooling device employed in a low-temperature showcase forms a refrigerant circuit by sequentially connecting a compressor, a condenser, a decompression device, a cooler, and the like in a circular manner by piping, and a predetermined amount is included in the refrigerant circuit. The refrigerant is enclosed. When the compressor is operated, the refrigerant is compressed into a high-temperature and high-pressure gas state and flows into the condenser. In the condenser, the refrigerant dissipates heat and is condensed and liquefied, and then decompressed by the decompression device and supplied to the cooler. In the cooler, the liquid refrigerant after being depressurized evaporates, and at that time, it absorbs heat from the surroundings and exhibits a cooling action.

ここで、冷却器による冷却作用を精密に制御するため、減圧装置として電動膨張弁が用いられている（特許文献１参照。）。この電動膨張弁は、圧縮機などの他の冷却機器と共に制御装置に接続され、当該制御装置によりこれら冷却装置により冷却される被冷却空間の温度制御を行っている。
特許第２５３８４４４号公報 Here, in order to precisely control the cooling action by the cooler, an electric expansion valve is used as a decompression device (see Patent Document 1). This electric expansion valve is connected to a control device together with other cooling devices such as a compressor, and the control device controls the temperature of the space to be cooled that is cooled by these cooling devices.
Japanese Patent No. 2538444

そして、従来の冷却装置の制御装置は、冷却器の冷媒入口温度や冷媒出口温度又は、圧縮機の吐出温度や吸込温度などに基づき、総じて電動膨張弁や圧縮機又は制御装置自体の異常検出を行っていた。そのため、電動膨張弁に異常が生じた場合、直接、これらの異常を個別に検出することが不可能であった。そのため、迅速に、電動膨張弁の異常に対応することができないという問題があった。これにより、電動膨張弁の異常検出が遅延することから、冷却器における冷却不良などの致命的な状態を招く問題があった。   The conventional control device for the cooling device generally detects abnormality of the electric expansion valve, the compressor or the control device itself based on the refrigerant inlet temperature and the refrigerant outlet temperature of the cooler or the discharge temperature and suction temperature of the compressor. I was going. Therefore, when abnormalities occur in the electric expansion valve, it is impossible to directly detect these abnormalities individually. Therefore, there is a problem that it is not possible to quickly cope with the abnormality of the electric expansion valve. As a result, detection of the abnormality of the electric expansion valve is delayed, and there has been a problem of causing a fatal state such as a cooling failure in the cooler.

本発明の冷却装置の制御装置は、圧縮機、凝縮器、電動膨張弁及び冷却器を順次環状に配管接続して成る冷却装置において、冷却器における冷媒の過熱度に基づき、電動膨張弁を制御する制御手段を備え、この制御手段は、電動膨張弁への制御出力線の短絡を検出する手段を有するものである。   The control device for the cooling device of the present invention is a cooling device in which a compressor, a condenser, an electric expansion valve, and a cooler are sequentially connected in a pipe, and controls the electric expansion valve based on the degree of superheat of the refrigerant in the cooler. The control means includes means for detecting a short circuit of the control output line to the electric expansion valve.

請求項２の発明の冷却装置の制御装置は、圧縮機、凝縮器、電動膨張弁及び冷却器を順次環状に配管接続して成る冷却装置において、冷却器における冷媒の過熱度に基づき、電動膨張弁を制御する制御手段を備え、この制御手段は、電動膨張弁への制御出力線の断線を検出する手段を有するものである。   According to a second aspect of the present invention, there is provided a control device for a cooling device comprising: a compressor, a condenser, an electric expansion valve, and a cooler, which are sequentially connected in an annular manner; an electric expansion based on a degree of superheat of the refrigerant in the cooler. Control means for controlling the valve is provided, and this control means has means for detecting disconnection of the control output line to the electric expansion valve.

請求項３の発明の冷却装置の制御装置は、圧縮機、凝縮器、電動膨張弁及び冷却器を順次環状に配管接続して成る冷却装置において、冷却器における冷媒の過熱度に基づき、電動膨張弁を制御する制御手段を備え、この制御手段は、過熱度のデータから電動膨張弁における異常発生を判定するものである。   According to a third aspect of the present invention, there is provided a control device for a cooling device comprising: a compressor, a condenser, an electric expansion valve, and a cooler, which are sequentially connected in an annular manner; the electric expansion based on the degree of superheat of the refrigerant in the cooler. Control means for controlling the valve is provided, and this control means determines the occurrence of abnormality in the electric expansion valve from the superheat data.

請求項４の発明の冷却装置の制御装置は、上記各発明において、制御手段は、電動膨張弁への制御出力線の短絡、断線又は当該電動膨張弁において異常が発生したものと判定した場合、所定の保護動作を実行するものである。   When the control device of the cooling device of the invention of claim 4 in each of the above inventions determines that the control means has short-circuited or disconnected the control output line to the electric expansion valve or an abnormality has occurred in the electric expansion valve, A predetermined protection operation is performed.

請求項５の発明の冷却装置の制御装置は、上記各発明において、制御手段は、電動膨張弁への制御出力線の短絡、断線又は当該電動膨張弁において異常が発生したものと判定した場合、所定の警報動作を実行するものである。   When the control device of the cooling device of the invention of claim 5 in each of the above inventions determines that the control means has caused a short circuit or disconnection of the control output line to the electric expansion valve or that an abnormality has occurred in the electric expansion valve, A predetermined alarm operation is executed.

本発明によれば、圧縮機、凝縮器、電動膨張弁及び冷却器を順次環状に接続して成る冷却装置において、冷却器における冷媒の過熱度に基づき、電動膨張弁を制御する制御手段を備え、この制御手段は、電動膨張弁への制御出力線の短絡を検出する手段を有するので、容易に電動膨張弁への制御出力線の短絡を直接、検出することができるようになる。これにより、電動膨張弁への制御出力線が短絡した際に、冷却器の冷却不良などの致命的な状態となる前に、迅速に対応することが可能となる。   According to the present invention, in the cooling device in which the compressor, the condenser, the electric expansion valve, and the cooler are sequentially connected in an annular manner, the control device that controls the electric expansion valve based on the degree of superheat of the refrigerant in the cooler is provided. Since the control means has means for detecting a short circuit of the control output line to the electric expansion valve, the short circuit of the control output line to the electric expansion valve can be easily detected directly. As a result, when the control output line to the electric expansion valve is short-circuited, it becomes possible to quickly cope with a critical state such as a cooling failure of the cooler.

請求項２の発明によれば、圧縮機、凝縮器、電動膨張弁及び冷却器を順次環状に配管接続して成る冷却装置において、冷却器における冷媒の過熱度に基づき、電動膨張弁を制御する制御手段を備え、この制御手段は、電動膨張弁への制御出力線の断線を検出する手段を有するので、容易に電動膨張弁への制御出力線の断線を直接、検出することができるようになる。これにより、電動膨張弁への制御出力線が断線した際に、冷却器の冷却不良などの致命的な状態となる前に、迅速に対応することが可能となる。   According to the second aspect of the present invention, in the cooling device in which the compressor, the condenser, the electric expansion valve, and the cooler are sequentially connected in a pipe, the electric expansion valve is controlled based on the degree of superheat of the refrigerant in the cooler. Since the control means includes means for detecting disconnection of the control output line to the electric expansion valve, the control output line to the electric expansion valve can be easily detected directly. Become. As a result, when the control output line to the electric expansion valve is disconnected, it becomes possible to respond quickly before a critical state such as a cooling failure of the cooler occurs.

請求項３の発明によれば、圧縮機、凝縮器、電動膨張弁及び冷却器を順次環状に配管接続して成る冷却装置において、冷却器における冷媒の過熱度に基づき、電動膨張弁を制御する制御手段を備え、この制御手段は、過熱度のデータから電動膨張弁における異常発生を判定するので、容易に過熱度のデータから電動膨張弁の異常発生を検出することができるようになる。これにより、電動膨張弁に異常が発生した際に、冷却器の冷却不良などの致命的な状態となる前に、迅速に対応することが可能となる。   According to the invention of claim 3, in the cooling device formed by sequentially connecting the compressor, the condenser, the electric expansion valve, and the cooler in an annular manner, the electric expansion valve is controlled based on the degree of superheat of the refrigerant in the cooler. Control means is provided, and this control means determines the occurrence of abnormality in the electric expansion valve from the superheat degree data, so that the occurrence of abnormality in the electric expansion valve can be easily detected from the superheat degree data. As a result, when an abnormality occurs in the electric expansion valve, it is possible to quickly respond before a fatal state such as a cooling failure of the cooler occurs.

請求項４の発明によれば、上記各発明において、制御手段は、電動膨張弁への制御出力線の短絡、断線又は当該電動膨張弁において異常が発生したものと判定した場合、所定の保護動作を実行するので、迅速に電動膨張弁の異常に対応することができ、冷却不良や過冷却などの不都合の発生を未然に回避することができるようになる。   According to the invention of claim 4, in each of the above-mentioned inventions, when the control means determines that the control output line to the electric expansion valve is short-circuited, disconnected, or that an abnormality has occurred in the electric expansion valve, the predetermined protective action Therefore, it is possible to quickly cope with the abnormality of the electric expansion valve, and to avoid inconveniences such as poor cooling and supercooling.

請求項５の発明によれば、上記各発明において、制御手段は、電動膨張弁への制御出力線の短絡、断線又は当該電動膨張弁において異常が発生したものと判定した場合、所定の警報動作を実行するので、電動膨張弁の異常を作業者に迅速に報知することができるようになる。   According to the invention of claim 5, in each of the above inventions, when the control means determines that a short circuit of the control output line to the electric expansion valve, disconnection, or abnormality has occurred in the electric expansion valve, a predetermined alarm operation is performed. Therefore, it is possible to quickly notify the operator of the abnormality of the electric expansion valve.

本発明は、係る従来の技術的課題を解決するために、電動膨張弁への制御出力線の異常を直接、検出することにより、冷却器の冷却不良などの致命的な状態を未然に回避することができる冷却装置の制御装置を提供する。以下に図面に基づき本発明の実施形態を詳述する。   In order to solve such a conventional technical problem, the present invention avoids a fatal state such as a cooling failure of a cooler by directly detecting an abnormality of a control output line to an electric expansion valve. A control device for a cooling device is provided. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は本発明を適用した実施例の冷却装置１の冷媒回路図、図２は冷却装置１の制御装置Ｃの電気回路図、図３はドライバ１２及びモータ１５の電気回路図を示している。   1 is a refrigerant circuit diagram of a cooling device 1 according to an embodiment to which the present invention is applied, FIG. 2 is an electric circuit diagram of a control device C of the cooling device 1, and FIG. 3 is an electric circuit diagram of a driver 12 and a motor 15. .

本実施例の冷却装置１は、例えば低温ショーケースに採用されるものであり、圧縮機２と、凝縮器３と、電動膨張弁４と、液管電磁弁５と、冷却器６とを配管７により順次環状に接続して冷媒回路が形成されると共に、回路内には所定量の冷媒が封入されている。また、凝縮器３の近傍には、図示しない凝縮器用送風機が設置されており、冷却器６の近傍には、同じく図示しない冷却器用送風機が設置されている。   The cooling device 1 of the present embodiment is employed in, for example, a low temperature showcase, and the compressor 2, the condenser 3, the electric expansion valve 4, the liquid pipe electromagnetic valve 5, and the cooler 6 are piped. A refrigerant circuit is formed by sequentially connecting them in an annular shape by 7 and a predetermined amount of refrigerant is sealed in the circuit. Further, a condenser blower (not shown) is installed in the vicinity of the condenser 3, and a cooler blower (not shown) is also installed in the vicinity of the cooler 6.

また、冷却器６の冷媒入口側及び冷媒出口側にはそれぞれの冷媒温度を検出するための冷媒入口側温度センサ１０及び冷媒出口側温度センサ１１が設けられているものとする。   Further, it is assumed that a refrigerant inlet side temperature sensor 10 and a refrigerant outlet side temperature sensor 11 for detecting the respective refrigerant temperatures are provided on the refrigerant inlet side and the refrigerant outlet side of the cooler 6.

次に、図２を参照して本発明の冷却装置の制御装置Ｃについて説明する。制御装置Ｃは、汎用のマイクロコンピュータより構成されており、この入力側には、前記冷媒入口側温度センサ１０及び冷媒出口側温度センサ１１が接続されている。また、この出力側には、電動膨張弁４に接続されたドライバ１２が接続されると共に、液管電磁弁５及び図示しないブザー又は警報ランプ若しくは、警報内容を表示する制御装置Ｃの表示部などの警報手段１３又は外部に設けられた集中管理手段に接続されている。また、この制御装置Ｃの入力側には、図示しないコントロールパネルが接続されていると共に、出力側には、図２には図示しないが圧縮機２、凝縮器用送風機や冷却器用送風機なども接続されているものとする。   Next, the control device C of the cooling device of the present invention will be described with reference to FIG. The control device C is composed of a general-purpose microcomputer, and the refrigerant inlet side temperature sensor 10 and the refrigerant outlet side temperature sensor 11 are connected to this input side. A driver 12 connected to the electric expansion valve 4 is connected to the output side, and the liquid pipe electromagnetic valve 5 and a buzzer or alarm lamp (not shown) or a display unit of the control device C for displaying alarm contents The alarm means 13 or centralized management means provided outside is connected. Further, a control panel (not shown) is connected to the input side of the control device C, and a compressor 2, a condenser blower, a cooler blower, etc. are connected to the output side, although not shown in FIG. It shall be.

一方、本実施例における電動膨張弁４はステッピングモータ１５を備えて成るものであり、このステッピングモータ１５には、コイル１６、１７、１８、１９が設けられている。そして、このステッピングモータ１５には、前記ドライバ１２を介して各コイル１６、１７、１８、１９に並列接続する電力供給線２０が接続される。また、各コイル１６、１７、１８、１９は、それぞれドライバ１２に配設された半導体により構成されるスイッチ２１、２２、２３、２４に制御出力線１６Ａ、１７Ａ、１８Ａ、１９Ａを介して接続される。   On the other hand, the electric expansion valve 4 in the present embodiment includes a stepping motor 15, and the stepping motor 15 is provided with coils 16, 17, 18, and 19. The stepping motor 15 is connected to a power supply line 20 connected in parallel to the coils 16, 17, 18, and 19 via the driver 12. The coils 16, 17, 18, and 19 are connected to switches 21, 22, 23, and 24 made of semiconductors disposed in the driver 12 via control output lines 16A, 17A, 18A, and 19A, respectively. The

そして、ドライバ１２に配設された各スイッチ２１、２２、２３、２４は、電流検出回路２５が介設された出力線２６を介してＧＮＤに接続されている。尚、この電流検出回路２５は、前記制御装置Ｃの入力側に接続されているものとする。   And each switch 21, 22, 23, 24 arrange | positioned at the driver 12 is connected to GND via the output line 26 in which the current detection circuit 25 was interposed. It is assumed that the current detection circuit 25 is connected to the input side of the control device C.

以上の構成により、前記コントロールパネルを操作することにより、冷却装置の運転が開始されると、制御装置Ｃは、冷媒入口側温度センサ１０及び冷媒出口側温度センサ１１の出力又は、該冷却装置により冷却される被冷却空間に設けられる図示しない温度センサの出力に基づき、圧縮機２及び凝縮器用送風機、冷却器用送風機を運転する。また、制御装置Ｃは、常時、前記液管電磁弁５を開放する。   With the above configuration, when the operation of the cooling device is started by operating the control panel, the control device C outputs the outputs of the refrigerant inlet side temperature sensor 10 and the refrigerant outlet side temperature sensor 11 or the cooling device. Based on the output of a temperature sensor (not shown) provided in the cooled space to be cooled, the compressor 2, the condenser blower, and the cooler blower are operated. The control device C always opens the liquid pipe solenoid valve 5.

そして、制御装置Ｃは、冷却器６の冷媒の入口側及び出口側に設けられた温度センサ１０、１１により演算される過熱度に基づき電動膨張弁４を制御する。即ち、過熱度が所定値、例えば１０ｄｅｇよりも高い場合には、制御装置Ｃは、ドライバ１２に電動膨張弁４の開度を上げることを指示し、ドライバ１２は、当該指示に基づき、前記各スイッチ２１、２２、２３及び２４を制御し、各制御出力線１６Ａ、１７Ａ、１８Ａ、１９Ａを介してステッピングモータ１５にパルス信号を送信する。そして、ステッピングモータ１５は、電力供給線２０から供給される電力により、当該パルス信号数に応じて正回転させ、当該電動膨張弁４の冷媒流量を増加させる。尚、ステッピングモータ１５に供給された電力は、出力線２６を介してＧＮＤに接続されると共に、当該出力線２６に流れる電流は電流検出回路２５により検出され、制御装置Ｃに出力される。   The control device C controls the electric expansion valve 4 based on the degree of superheat calculated by the temperature sensors 10 and 11 provided on the refrigerant inlet side and outlet side of the cooler 6. That is, when the degree of superheat is higher than a predetermined value, for example, 10 deg, the control device C instructs the driver 12 to increase the opening degree of the electric expansion valve 4, and the driver 12 The switches 21, 22, 23 and 24 are controlled, and a pulse signal is transmitted to the stepping motor 15 via the control output lines 16A, 17A, 18A and 19A. Then, the stepping motor 15 is rotated forward in accordance with the number of pulse signals by the electric power supplied from the electric power supply line 20 and increases the refrigerant flow rate of the electric expansion valve 4. The electric power supplied to the stepping motor 15 is connected to the GND via the output line 26, and the current flowing through the output line 26 is detected by the current detection circuit 25 and output to the control device C.

他方、過熱度が所定値、例えば１０ｄｅｇよりも低い場合には、制御装置Ｃは、ドライバ１２に電動膨張弁４の開度を下げることを指示し、ドライバ１２は、当該指示に基づき、前記各スイッチ２１、２２、２３及び２４を制御し、各制御出力線１６Ａ、１７Ａ、１８Ａ、１９Ａを介してステッピングモータ１５にパルス信号を送信する。そして、ステッピングモータ１５は、電力供給線２０から供給される電力により、当該パルス信号数に応じて逆回転させ、当該電動膨張弁４の冷媒流量を減少させる。尚、ステッピングモータ１５に供給された電力は、出力線２６を介してＧＮＤに接続されると共に、当該出力線２６に流れる電流は電流検出回路２５により検出され、制御装置Ｃに出力される。   On the other hand, when the degree of superheat is lower than a predetermined value, for example, 10 deg, the control device C instructs the driver 12 to lower the opening degree of the electric expansion valve 4, and the driver 12 The switches 21, 22, 23 and 24 are controlled, and a pulse signal is transmitted to the stepping motor 15 via the control output lines 16A, 17A, 18A and 19A. Then, the stepping motor 15 rotates in reverse according to the number of pulse signals by the power supplied from the power supply line 20, and decreases the refrigerant flow rate of the electric expansion valve 4. The electric power supplied to the stepping motor 15 is connected to the GND via the output line 26, and the current flowing through the output line 26 is detected by the current detection circuit 25 and output to the control device C.

これにより、電動膨張弁４により、冷却器６に供給される冷媒流量を随時制御することができ、適度な過熱度にて冷却器６において冷媒の蒸発を行うことができる。そのため、過熱度が所定の値を下回ることにより生じる圧縮機２への液バックを未然に回避することができるようになる。   Thus, the flow rate of the refrigerant supplied to the cooler 6 can be controlled as needed by the electric expansion valve 4, and the refrigerant can be evaporated in the cooler 6 with an appropriate degree of superheat. Therefore, the liquid back to the compressor 2 that occurs when the degree of superheat falls below a predetermined value can be avoided in advance.

尚、上述した如く出力線２６に流れる電流は常時、電流検出回路２５により検出され、制御装置Ｃに出力されるが、制御装置Ｃは、電動膨張弁４が正常状態とされている場合の電流値を制御装置Ｃに設けられた図示しないＲＯＭに記憶しておくものとする。   As described above, the current flowing through the output line 26 is always detected by the current detection circuit 25 and output to the control device C. The control device C is a current when the electric expansion valve 4 is in a normal state. The value is stored in a ROM (not shown) provided in the control device C.

ここで、電流検出回路２５により、制御装置Ｃに出力された電流値が、前記ＲＯＭに記憶された正常状態における電流値よりも著しく下回った場合、又は、ゼロであった場合は、制御装置Ｃは、電動膨張弁４の制御出力線１６Ａ、１７Ａ、１８Ａ、１９Ａ又は電力供給線２０の内、何れかが断線したものと判定する。   Here, if the current value output to the control device C by the current detection circuit 25 is significantly lower than the current value in the normal state stored in the ROM, or is zero, the control device C Determines that one of the control output lines 16A, 17A, 18A, 19A or the power supply line 20 of the electric expansion valve 4 is disconnected.

また、電流検出回路２５により、制御装置Ｃに出力された電流値が、前記ＲＯＭに記憶された正常状態における電流値よりも高い値、即ち、過電流であることを検出した場合には、制御装置Ｃは、電動膨張弁４の制御出力線１６Ａ、１７Ａ、１８Ａ、１９Ａ又は電力供給線２０の内、何れかが短絡したものと判定する。   If the current detection circuit 25 detects that the current value output to the control device C is higher than the current value stored in the ROM in the normal state, that is, an overcurrent, the control is performed. The device C determines that any one of the control output lines 16A, 17A, 18A, 19A or the power supply line 20 of the electric expansion valve 4 is short-circuited.

そして、制御装置Ｃは、上述の如く電動膨張弁４への制御出力線１６Ａ、１７Ａ、１８Ａ、１９Ａ又は電力供給線２０の内の何れかが断線又は短絡したものと判定した場合には、ブザー又は警報ランプ若しくは、制御装置Ｃに設けられた表示部などの警報手段１３により、作業者に電動膨張弁４への制御出力線に断線又は短絡が生じたことを警報する。また、制御装置Ｃは、警報手段１３による警報を行うと共に、外部の集中管理手段などに、電動膨張弁４への制御出力線に断線又は短絡が生じたことを通報するものとする。   When the control device C determines that one of the control output lines 16A, 17A, 18A, 19A or the power supply line 20 to the electric expansion valve 4 is disconnected or short-circuited as described above, Alternatively, an alarm lamp or an alarm means 13 such as a display unit provided in the control device C alerts the operator that the control output line to the electric expansion valve 4 is broken or short-circuited. In addition, the control device C issues a warning by the warning means 13 and reports to the external centralized management means or the like that the control output line to the electric expansion valve 4 is broken or short-circuited.

これにより、容易に電動膨張弁４への制御出力線１６Ａ、１７Ａ、１８Ａ、１９Ａ又は電力供給線２０の内の何れかの断線又は短絡を直接、検出することができるようになると共に、電動膨張弁４への制御出力線１６Ａ、１７Ａ、１８Ａ、１９Ａ又は電力供給線２０の内の何れかが断線又は短絡した場合でも、冷却器６の冷却不良などの致命的な状態となる前に、迅速に対応することができるようになる。   As a result, it becomes possible to easily detect any disconnection or short circuit among the control output lines 16A, 17A, 18A, 19A or the power supply line 20 to the electric expansion valve 4, and the electric expansion. Even if one of the control output lines 16A, 17A, 18A, 19A or the power supply line 20 to the valve 4 is disconnected or short-circuited, it can be quickly performed before a critical state such as a cooling failure of the cooler 6 occurs. It becomes possible to correspond to.

また、係る際に制御装置Ｃは、電動膨張弁４の開度を固定する共に、常時開放されていた液管電磁弁５の開閉制御を行うものとする。これにより、作業者によるメンテナンス作業が行われるまでの間、当該液管電磁弁５の開閉制御を行うことにより、継続して冷却装置１による冷却運転を継続することができるようになる。そのため、電動膨張弁４への制御が不能となった場合でも冷却器６の過熱度を制御することが可能となり、被冷却空間の過冷却や冷却不足による温度上昇を未然に回避することができるようになる。   In this case, the control device C fixes the opening degree of the electric expansion valve 4 and controls the opening and closing of the liquid pipe electromagnetic valve 5 that is always open. Thus, the cooling operation by the cooling device 1 can be continued by performing the open / close control of the liquid pipe solenoid valve 5 until the maintenance work by the worker is performed. Therefore, even when the control to the electric expansion valve 4 becomes impossible, the degree of superheat of the cooler 6 can be controlled, and the temperature rise due to overcooling or insufficient cooling of the space to be cooled can be avoided in advance. It becomes like this.

また、制御装置Ｃは、予め電動膨張弁４の開度に対応する正常な過熱度をＲＯＭに記憶しておいてもよいものとする。この場合、冷媒入口側温度センサ１０及び冷媒出口側温度センサ１１の出力により制御装置Ｃにおいて演算された過熱度が、ドライバ１２において検出される電動膨張弁４の開度に対応する前記過熱度と比べて著しく異なる場合に、制御装置Ｃは、電動膨張弁４自体に異常が発生したものと判定する。   Further, the control device C may store a normal degree of superheat corresponding to the opening degree of the electric expansion valve 4 in the ROM in advance. In this case, the degree of superheat calculated in the control device C based on the outputs of the refrigerant inlet side temperature sensor 10 and the refrigerant outlet side temperature sensor 11 is the superheat degree corresponding to the opening of the electric expansion valve 4 detected by the driver 12. If the difference is significantly different, the control device C determines that an abnormality has occurred in the electric expansion valve 4 itself.

そして、制御装置Ｃは、上記電動膨張弁４への制御出力線１６Ａ、１７Ａ、１８Ａ、１９Ａの断線又は短絡を検出した場合と同様に、電動膨張弁４の異常発生をブザー又は警報ランプ若しくは、制御装置Ｃに設けられた表示部などの警報手段１３により、作業者に警報する。また、この場合にも、制御装置Ｃは、警報手段１３による警報を行うと共に、外部の集中管理手段などに、電動膨張弁４の異常発生を通報するものとする。   Then, the control device C, like the case where the disconnection or short circuit of the control output lines 16A, 17A, 18A, 19A to the electric expansion valve 4 is detected, a buzzer or an alarm lamp or An alarm is given to the worker by an alarm means 13 such as a display unit provided in the control device C. Also in this case, the control device C issues a warning by the warning means 13 and notifies the external centralized management means or the like of the occurrence of an abnormality in the electric expansion valve 4.

これにより、電動膨張弁４に異常が発生した場合であっても、電動膨張弁４自体に異常が発生したことを検知し、その旨を作業者に通報することができるため、冷却器６の冷却不良などの致命的な状態となる前に、迅速に対応することができるようになる。   As a result, even if an abnormality occurs in the electric expansion valve 4, it is possible to detect that an abnormality has occurred in the electric expansion valve 4 itself and to report the fact to the operator. It becomes possible to respond quickly before a critical condition such as a cooling failure occurs.

本発明を適用した冷却装置の冷媒回路図である。It is a refrigerant circuit figure of the cooling device to which this invention is applied. 冷却装置の制御装置の電気回路図である。It is an electric circuit diagram of the control apparatus of a cooling device. ドライバ及びモータの電気回路図である。It is an electric circuit diagram of a driver and a motor.

符号の説明Explanation of symbols

Ｃ 制御装置
１ 冷却装置
２ 圧縮機
４ 電動膨張弁
５ 液管電磁弁
６ 冷却器
１０ 冷媒入口側温度センサ
１１ 冷媒出口側温度センサ
１２ ドライバ
１３ 警報手段
１５ ステッピングモータ
１６、１７、１８、１９ コイル
１６Ａ、１７Ａ、１８Ａ、１９Ａ 制御出力線
２０ 電力供給線
２１、２２、２３、２４ スイッチ
２５ 電流検出回路
２６ 出力線 C Controller 1 Cooling device 2 Compressor 4 Electric expansion valve 5 Liquid pipe solenoid valve 6 Cooler 10 Refrigerant inlet side temperature sensor 11 Refrigerant outlet side temperature sensor 12 Driver 13 Alarm means 15 Stepping motors 16, 17, 18, 19 Coil 16A , 17A, 18A, 19A Control output line 20 Power supply line 21, 22, 23, 24 Switch 25 Current detection circuit 26 Output line

Claims (5)

圧縮機、凝縮器、電動膨張弁及び冷却器を順次環状に配管接続して成る冷却装置において、
前記冷却器における冷媒の過熱度に基づき、前記電動膨張弁を制御する制御手段を備え、
該制御手段は、前記電動膨張弁への制御出力線の短絡を検出する手段を有することを特徴とする冷却装置の制御装置。 In the cooling device comprising a compressor, a condenser, an electric expansion valve, and a cooler connected in a circular pipe in order,
Control means for controlling the electric expansion valve based on the degree of superheat of the refrigerant in the cooler,
The control device for a cooling device, wherein the control means includes means for detecting a short circuit of a control output line to the electric expansion valve. 圧縮機、凝縮器、電動膨張弁及び冷却器を順次環状に配管接続して成る冷却装置において、
前記冷却器における冷媒の過熱度に基づき、前記電動膨張弁を制御する制御手段を備え、
該制御手段は、前記電動膨張弁への制御出力線の断線を検出する手段を有することを特徴とする冷却装置の制御装置。 In the cooling device comprising a compressor, a condenser, an electric expansion valve, and a cooler connected in a circular pipe in order,
Control means for controlling the electric expansion valve based on the degree of superheat of the refrigerant in the cooler,
The control device for a cooling apparatus, wherein the control means includes means for detecting disconnection of a control output line to the electric expansion valve. 圧縮機、凝縮器、電動膨張弁及び冷却器を順次環状に配管接続して成る冷却装置において、
前記冷却器における冷媒の過熱度に基づき、前記電動膨張弁を制御する制御手段を備え、
該制御手段は、前記過熱度のデータから前記電動膨張弁における異常発生を判定することを特徴とする冷却装置の制御装置。 In the cooling device comprising a compressor, a condenser, an electric expansion valve, and a cooler connected in a circular pipe in order,
Control means for controlling the electric expansion valve based on the degree of superheat of the refrigerant in the cooler,
The control device of the cooling device, wherein the control means determines occurrence of abnormality in the electric expansion valve from the superheat degree data. 前記制御手段は、前記電動膨張弁への制御出力線の短絡、断線又は当該電動膨張弁において異常が発生したものと判定した場合、所定の保護動作を実行することを特徴とする請求項１、請求項２又は請求項３の冷却装置の制御装置。 The control means performs a predetermined protection operation when it is determined that a short circuit of the control output line to the electric expansion valve, disconnection, or abnormality has occurred in the electric expansion valve. The control apparatus of the cooling device of Claim 2 or Claim 3. 前記制御手段は、前記電動膨張弁への制御出力線の短絡、断線又は当該電動膨張弁において異常が発生したものと判定した場合、所定の警報動作を実行することを特徴とする請求項１、請求項２、請求項３又は請求項４の冷却装置の制御装置。 The control means performs a predetermined alarm operation when it is determined that a short circuit of the control output line to the electric expansion valve, disconnection or abnormality has occurred in the electric expansion valve, The control apparatus of the cooling device of Claim 2, Claim 3 or Claim 4.
JP2003331343A 2003-09-24 2003-09-24 Control device for cooling system Expired - Fee Related JP4301908B2 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007032983A (en) * 2005-07-28 2007-02-08 Sanyo Electric Co Ltd Cooling storage shed
KR20110005159A (en) * 2009-07-09 2011-01-17 엘지전자 주식회사 Air conditioner and method for detecting error of air conditioner
JP2019027714A (en) * 2017-08-01 2019-02-21 株式会社鷺宮製作所 Control device, control method, and control program
CN109373509A (en) * 2018-10-15 2019-02-22 珠海格力电器股份有限公司 A kind of air conditioner electronic expansion valve short circuit self checking method
JP2023039061A (en) * 2021-09-08 2023-03-20 ダイキン工業株式会社 air conditioning system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007032983A (en) * 2005-07-28 2007-02-08 Sanyo Electric Co Ltd Cooling storage shed
JP4632894B2 (en) * 2005-07-28 2011-02-16 三洋電機株式会社 Cooling storage
KR20110005159A (en) * 2009-07-09 2011-01-17 엘지전자 주식회사 Air conditioner and method for detecting error of air conditioner
KR101590367B1 (en) * 2009-07-09 2016-02-18 엘지전자 주식회사 Air conditioner and method for detecting error of air conditioner
JP2019027714A (en) * 2017-08-01 2019-02-21 株式会社鷺宮製作所 Control device, control method, and control program
CN109373509A (en) * 2018-10-15 2019-02-22 珠海格力电器股份有限公司 A kind of air conditioner electronic expansion valve short circuit self checking method
JP2023039061A (en) * 2021-09-08 2023-03-20 ダイキン工業株式会社 air conditioning system

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