JP2010085053A - Abnormality detection method for automatic ice-making machine - Google Patents

Abnormality detection method for automatic ice-making machine Download PDF

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JP2010085053A
JP2010085053A JP2008256777A JP2008256777A JP2010085053A JP 2010085053 A JP2010085053 A JP 2010085053A JP 2008256777 A JP2008256777 A JP 2008256777A JP 2008256777 A JP2008256777 A JP 2008256777A JP 2010085053 A JP2010085053 A JP 2010085053A
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ice making
ice
abnormality
making
water
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JP5294781B2 (en
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Tomohiro Takagi
友裕 高木
Norikazu Morimoto
了司 森本
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Hoshizaki Electric Co Ltd
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Hoshizaki Electric Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25C—PRODUCING, WORKING OR HANDLING ICE
    • F25C1/00—Producing ice
    • F25C1/12—Producing ice by freezing water on cooled surfaces, e.g. to form slabs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25C—PRODUCING, WORKING OR HANDLING ICE
    • F25C2400/00—Auxiliary features or devices for producing, working or handling ice
    • F25C2400/14—Water supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25C—PRODUCING, WORKING OR HANDLING ICE
    • F25C2500/00—Problems to be solved
    • F25C2500/08—Sticking or clogging of ice
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25C—PRODUCING, WORKING OR HANDLING ICE
    • F25C2600/00—Control issues
    • F25C2600/02—Timing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25C—PRODUCING, WORKING OR HANDLING ICE
    • F25C2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25C2700/04—Level of water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25C—PRODUCING, WORKING OR HANDLING ICE
    • F25C5/00—Working or handling ice
    • F25C5/02—Apparatus for disintegrating, removing or harvesting ice
    • F25C5/04—Apparatus for disintegrating, removing or harvesting ice without the use of saws
    • F25C5/08—Apparatus for disintegrating, removing or harvesting ice without the use of saws by heating bodies in contact with the ice
    • F25C5/10—Apparatus for disintegrating, removing or harvesting ice without the use of saws by heating bodies in contact with the ice using hot refrigerant; using fluid heated by refrigerant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25C—PRODUCING, WORKING OR HANDLING ICE
    • F25C5/00—Working or handling ice
    • F25C5/18—Storing ice
    • F25C5/182—Ice bins therefor
    • F25C5/187—Ice bins therefor with ice level sensing means

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Production, Working, Storing, Or Distribution Of Ice (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an abnormality detection method for an automatic ice-making machine capable of detecting an abnormality at an early stage even if the abnormality such as a delay or the shortening of an ice making time occurs. <P>SOLUTION: The down-flow type ice-making machine 40 is equipped with two ice-making units 41, 41, a control means 48, and an ice storage chamber 34. Each ice-making unit 41 has an ice-making part 14, an ice-making water tank 24 storing ice-making water, a circulating pump 30 circulating and supplying the ice-making water stored in the ice-making water tank 24 to the ice-making part 14, and a float switch 26 detecting an amount of the ice-making water in the ice-making water tank 24. When a preset first abnormality occurrence time has passed from the initial detection of an ice-making completion water level of the float switch 26 in one of the ice-making units 41, and the ice-making completion water level is not detected by the float switch 26 in the other ice-making unit 41, the control means 48 determines that there is an abnormality in one of the ice-making units 41. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

この発明は、自動製氷機の異常検知方法に関し、更に詳細には、製氷水タンクに貯溜した製氷水を製氷部へ循環供給して氷塊を製造する製氷ユニットを複数備えた自動製氷機の異常検知方法に関するものである。   The present invention relates to an abnormality detection method for an automatic ice maker, and more specifically, an abnormality detection for an automatic ice maker equipped with a plurality of ice making units for producing ice blocks by circulating and supplying ice making water stored in an ice making water tank to an ice making unit. It is about the method.

レストラン等の厨房に設置されて氷を連続的に製造する自動製氷機として、例えば、製氷部に製氷水を流下させて氷塊を製造する流下式の自動製氷機(流下式製氷機)が知られている。このような流下式製氷機のうち、特許文献１に示すように、製氷部および製氷水タンクを備えた製氷ユニットを複数有するものがある。図４は、製氷ユニット１０を２つ備えた従来の流下式製氷機１２を示す概略図であって、各製氷ユニット１０の製氷部１４は、対向配置した一対の製氷板１６,１６を複数並列に配置して構成され、各製氷板１６の間に冷凍系(図示せず)から導出する蒸発管１８が蛇行配置されている。   As an automatic ice maker installed in a kitchen of a restaurant or the like, for example, a flow-down type automatic ice maker (flow-down type ice maker) that manufactures ice blocks by flowing ice-making water down to the ice making unit is known. ing. Among such flow-down type ice making machines, as shown in Patent Document 1, there is one having a plurality of ice making units including an ice making unit and an ice making water tank. FIG. 4 is a schematic view showing a conventional flow-down ice making machine 12 having two ice making units 10, and the ice making unit 14 of each ice making unit 10 includes a plurality of parallelly arranged pairs of ice making plates 16, 16. An evaporation pipe 18 led out from a refrigeration system (not shown) is arranged between the ice making plates 16 in a meandering manner.

各製氷ユニット１０の下方には、他方の製氷ユニット１０へ向けて下方傾斜して設けられる氷案内板２０を備えている。この氷案内板２０には、複数の戻り孔２２が開設され、前記製氷部１４へ供給されて氷結に至らなかった製氷水(未氷結水)を戻り孔２２を介して下方の製氷水タンク２４へ回収するようになっている。前記氷案内板２０の下方に配設された製氷水タンク２４は、その内部に所定量の製氷水を貯溜し得るよう構成されている。また、前記製氷水タンク２４の内部にフロートスイッチ２６が設けられ、該フロートスイッチ２６により製氷水タンク２４内の製氷水の量を検知し得るようになっている。   Below each ice making unit 10, an ice guide plate 20 is provided that is inclined downward toward the other ice making unit 10. A plurality of return holes 22 are formed in the ice guide plate 20, and ice-making water that has been supplied to the ice-making unit 14 and has not formed freezing (unfreezing water) is passed through the return holes 22 to the ice-making water tank 24 below. It has come to be collected. The ice making water tank 24 disposed below the ice guide plate 20 is configured to store a predetermined amount of ice making water therein. A float switch 26 is provided inside the ice making water tank 24, and the float switch 26 can detect the amount of ice making water in the ice making water tank 24.

前記製氷水タンク２４には、製氷水供給管２８が連通接続され、該供給管２８を介して製氷水を製氷部１４へ供給するようになっている。この製氷水供給管２８には、循環ポンプ３０が設けられており、該循環ポンプ３０により製氷水タンク２４内の製氷水を製氷部１４へ圧送するようになっている。前記製氷水供給管２８は、製氷部１４の上方に延在する製氷水散水管３２に連通接続される。前記両製氷ユニット１０,１０の製氷水タンク２４の下方には、上方に開口した貯氷庫３４が設けられ、両ユニット１０,１０で製造された氷塊は貯氷庫３４へ放出されるようになっている。この貯氷庫３４内には、該庫内の氷塊が満杯となったときに作動する貯氷検知手段３６が２つ設けられている。すなわち、各貯氷検知手段３６は、図４に参照されるように、貯氷庫３４内において、各製氷ユニット１０で製造された氷塊が堆積して形成される山の頂部(図４の符号Ｂ参照)に位置するよう設けられ、該貯氷検知手段３６が氷塊を検知したときに、流下式製氷機１２に設けた制御手段３８が製氷運手を停止させるようになっている。   An ice making water supply pipe 28 is connected in communication with the ice making water tank 24, and ice making water is supplied to the ice making unit 14 through the supply pipe 28. This ice making water supply pipe 28 is provided with a circulation pump 30, and the ice making water in the ice making water tank 24 is pumped to the ice making unit 14 by the circulation pump 30. The ice making water supply pipe 28 is connected in communication with an ice making water sprinkling pipe 32 extending above the ice making section 14. Below the ice making water tank 24 of both ice making units 10, 10, an ice storage 34 that opens upward is provided, and ice blocks produced by both units 10, 10 are discharged to the ice storage 34. Yes. The ice storage 34 is provided with two ice storage detection means 36 that operate when the ice block in the storage becomes full. That is, as shown in FIG. 4, each ice storage detection means 36 has a top of a mountain formed by accumulation of ice blocks produced by each ice making unit 10 in the ice storage 34 (see symbol B in FIG. 4). ), And when the ice storage detection means 36 detects an ice block, the control means 38 provided in the flow-down type ice making machine 12 stops the ice making operator.

製氷運転に際しては、前記循環ポンプ３０により製氷水が製氷水散水管３２を介して各製氷板１６の製氷面に散布供給されると共に、冷凍系から蒸発管１８に冷媒が供給される。製氷水は、冷媒により冷却された製氷面を流下することで次第に製氷面上で氷結を始め、該製氷面に氷塊が製造される。一方、製氷水タンク２４内の製氷水は、氷塊が成長するに伴ない減少し、前記フロートスイッチ２６のフロートは下降していく。そして、一方の製氷ユニット１０において、氷塊が所定のサイズとなって製氷が完了したときには、前記製氷水タンク２４の製氷水が製氷完了水位に到達する(図４参照)。すると、前記フロートスイッチ２６がこれを検知し、この検知信号を制御手段３８へ送る。次いで、他方の製氷ユニット１０におけるフロートスイッチ２６も製氷完了水位を検知すると、制御手段３８は製氷が完了したと判定し、製氷運転を終了させる。すなわち、制御手段３８は、全てのフロートスイッチ２６,２６が製氷完了水位を検知したときに、製氷が完了したと判定する。   During the ice making operation, the ice making water is sprayed and supplied to the ice making surface of each ice making plate 16 via the ice making water sprinkling pipe 32 and the refrigerant is supplied from the refrigeration system to the evaporation pipe 18 during the ice making operation. The ice making water gradually freezes on the ice making surface by flowing down the ice making surface cooled by the refrigerant, and ice blocks are produced on the ice making surface. On the other hand, the ice making water in the ice making water tank 24 decreases as the ice block grows, and the float of the float switch 26 descends. In one ice making unit 10, when ice making is completed and ice making is completed, the ice making water in the ice making water tank 24 reaches the ice making complete water level (see FIG. 4). Then, the float switch 26 detects this and sends this detection signal to the control means 38. Next, when the float switch 26 in the other ice making unit 10 also detects the ice making completion water level, the control means 38 determines that the ice making is completed and ends the ice making operation. That is, the control means 38 determines that ice making is completed when all the float switches 26, 26 detect the ice making completion water level.

製氷運転が終了すると、前記制御手段３８は除氷運転へ移行し、蒸発管１８にホットガスを供給すると共に、図示しない除氷水散水管から常温の除氷水を製氷板１６の裏面に供給する。すると、前記製氷部１４は、ホットガスおよび除氷水により加熱され、製氷面に形成された氷塊が融解して製氷面から落下する。製氷部１４から落下した氷塊は、前記氷案内板２０に受け止められ、該案内板２０により案内されて前記貯氷庫３４へ放出される。   When the ice making operation is completed, the control means 38 shifts to the deicing operation and supplies hot gas to the evaporation pipe 18 and also supplies normal temperature deicing water from the deicing water sprinkling pipe (not shown) to the back surface of the ice making plate 16. Then, the ice making unit 14 is heated by hot gas and deicing water, and the ice blocks formed on the ice making surface melt and fall from the ice making surface. Ice blocks falling from the ice making unit 14 are received by the ice guide plate 20, guided by the guide plate 20, and discharged to the ice storage 34.

ところで前記製氷板１６は、長年使用することで、その製氷面等にスケールや不純物等が堆積した汚れが付着することがある。例えば、一方の製氷ユニット１０において、製氷板１６の何れか１つに汚れが付着したとすると、この汚れにより熱交換率が低下して当該製氷板１６に氷塊ができ難くなる。すると、異常が発生した製氷板１６で氷結すべき製氷水は他の製氷板１６で氷結されることになるので、正常な製氷板１６には、通常より大きな氷塊が製造される。この場合、氷塊が大きくなるにつれて製氷面からの距離が離れ熱交換率が低下するので、氷塊が成長するまでに要する時間は長くなる。従って、異常が発生した製氷ユニット１０においては、製氷水タンク２４内の製氷水はゆっくり減少するので、フロートスイッチ２６が製氷完了水位を検知するタイミングは正常な場合に比べ遅延する。一方、正常な製氷ユニット１０では、製氷運転は通常通り進行し、製氷完了までに要する時間に遅延は生じない。   By the way, when the ice making plate 16 is used for many years, dirt with scales, impurities, etc. may adhere to its ice making surface. For example, in one ice making unit 10, if dirt is attached to any one of the ice making plates 16, the heat exchange rate decreases due to the dirt, and it becomes difficult to form ice blocks on the ice making plate 16. Then, since the ice making water to be frozen on the ice making plate 16 in which an abnormality has occurred is frozen on the other ice making plate 16, a larger ice block than usual is produced on the normal ice making plate 16. In this case, as the ice mass increases, the distance from the ice making surface increases and the heat exchange rate decreases, so the time required for the ice mass to grow increases. Accordingly, in the ice making unit 10 in which an abnormality has occurred, the ice making water in the ice making water tank 24 decreases slowly, so that the timing at which the float switch 26 detects the ice making completion water level is delayed as compared with the normal case. On the other hand, in the normal ice making unit 10, the ice making operation proceeds as usual, and there is no delay in the time required to complete ice making.

また、前述のような巨大な氷塊が形成されると、製氷面上で上下の氷塊が連結したり、製氷面を仕切る仕切板を乗り越えて左右に氷塊が連結することがある。このように連結した氷塊(以下、連結氷という)は、除氷運転において除氷され難く、製氷板１６に連結氷が残留したまま除氷運転が終了することがある。すると、製氷運転で再び連結氷を製氷する二重製氷が発生してしまうが、この場合にも、巨大な連結氷を製氷することとなるので、上記同様な理由により製氷時間が大幅に遅延する要因となる。そこで、従来の流下式製氷機１２では、異常により製氷時間が遅延することに鑑み、全てのフロートスイッチ２６,２６が製氷完了水位を検知するまでに要する時間が予め設定された時間(以下、異常遅延時間という)を超えた場合に、制御手段３８は異常が発生したと判定し、製氷運転を終了させるようになっている。
特開２００４−６９１８１号公報 In addition, when a large ice block as described above is formed, the upper and lower ice blocks may be connected on the ice making surface, or the ice blocks may be connected to the left and right by going over a partition plate that partitions the ice making surface. The ice blocks connected in this way (hereinafter referred to as “connected ice”) are not easily deiced during the deicing operation, and the deicing operation may end with the connected ice remaining on the ice making plate 16. Then, double ice making that makes connected ice again in ice making operation occurs, but in this case as well, huge connected ice is made, so ice making time is greatly delayed for the same reason as above. It becomes a factor. In view of the fact that the conventional ice making machine 12 has a delay in ice making time due to an abnormality, the time required for all the float switches 26 and 26 to detect the ice making completion water level is a preset time (hereinafter referred to as abnormal). When the delay time is exceeded, the control means 38 determines that an abnormality has occurred and ends the ice making operation.
JP 2004-69181 A

ところが、従来の異常検知方法では、僅かな製氷時間の遅延も異常と誤検知してしまうのを回避するため、異常遅延時間をなるべく大きく設定して誤検知を防止する必要があった。そのため、従来の方法で異常を検知したときには、製氷部１４に既に大きな氷塊や連結氷が製造された状態となっていることも多く、復旧作業に時間を要し、メンテナンス費が嵩む難点があった。また、巨大な氷塊によって製氷板１６等が変形・破損したりすることもあった。すなわち、従来の方法では、異常な氷塊の製造がかなり進行するまで異常を検知し得ない欠点を有していた。   However, in the conventional abnormality detection method, it is necessary to prevent the erroneous detection by setting the abnormal delay time as large as possible in order to avoid erroneous detection of even a slight ice-making time delay as an abnormality. For this reason, when an abnormality is detected by the conventional method, there are many cases where large ice blocks or connected ice is already manufactured in the ice making unit 14, and it takes time for the restoration work and there is a problem that maintenance costs increase. It was. In addition, the ice making plate 16 or the like may be deformed or damaged by a huge ice block. That is, the conventional method has a defect that the abnormality cannot be detected until the production of the abnormal ice block is considerably advanced.

また、上記異常の発生により巨大な氷塊や連結氷が製造された場合において、仮にこれらの氷塊が除氷運転により除氷できたとしても、当該氷塊が氷案内板２０に引っ掛かってしまうことがある。すると、異常が発生した側の製氷ユニット１０では、前記製氷部１４から製氷水タンク２４へ回収されるべき未氷結水の一部が、氷案内板２０上の氷塊を伝って貯氷庫３４等へ落下してしまい、製氷水タンク２４へ回収されなくなる事態が生じてしまう。すると、製氷水タンク２４内の製氷水が早く減少し、異常が生じた製氷ユニット１０では、短時間で製氷完了水位を検知してしまう。ところが、従来の異常検知方法では、このように製氷時間が短縮されてしまった場合でも、前記異常遅延時間を越えない限り前記制御手段３８が異常判定をすることはなく、そのまま運転が続行されてしまう問題があった。すなわち、従来の異常検知方法では、製氷時間が短縮されてしまうような異常を検知し得ない欠点も有していた。   In addition, when a large ice block or connected ice is produced due to the occurrence of the abnormality, even if these ice blocks can be deiced by the deicing operation, the ice blocks may be caught by the ice guide plate 20. . Then, in the ice making unit 10 on the side where the abnormality has occurred, a part of the uniced water to be collected from the ice making unit 14 to the ice making water tank 24 travels along the ice block on the ice guide plate 20 to the ice storage 34 or the like. It will fall and the situation which will not be collect | recovered by the ice-making water tank 24 will arise. Then, the ice making water in the ice making water tank 24 decreases quickly, and the ice making unit 10 in which an abnormality has occurred detects the ice making completion water level in a short time. However, in the conventional abnormality detection method, even when the ice making time is shortened in this way, the control means 38 does not make an abnormality determination unless the abnormal delay time is exceeded, and the operation is continued as it is. There was a problem. That is, the conventional abnormality detection method has a drawback that it cannot detect an abnormality that shortens the ice making time.

そこで、本発明は、前述した従来の技術に内在している前記課題に鑑み、これを好適に解決するべく提案されたものであって、製氷時間が遅延する異常や短縮する異常を早い段階で検知し得る自動製氷機の異常検知方法を提供することを目的とする。   Therefore, in view of the problems inherent in the above-described conventional technology, the present invention has been proposed to suitably solve this problem, and an abnormality that delays or shortens ice making time is detected at an early stage. An object of the present invention is to provide an abnormality detection method for an automatic ice maker that can be detected.

前述した課題を解決し、所期の目的を好適に達成するため、本願の請求項１に係る発明の自動製氷機の異常検知方法は、
冷凍系から供給される冷媒により冷却される製氷部と、製氷水を貯溜する製氷水タンクと、前記製氷水タンクに貯溜された製氷水を前記製氷部へ供給する循環ポンプと、前記製氷水タンクに設けられ、該タンク内の製氷水の量を検知する検知手段とを有し、製氷運転において、前記製氷部へ供給されて氷結に至らなかった未氷結水を製氷水タンクで回収するよう構成された製氷ユニットを複数備え、製氷運転に際し、全ての検知手段が製氷水タンク内の製氷水が製氷完了水位に到達したのを検知したときに、製氷が完了したと判定する制御手段を備えた自動製氷機において、
何れかの製氷ユニットにおける検知手段が、最初に製氷完了水位を検知したときから予め設定された第１異常発生時間の経過時に、他の何れかの製氷ユニットにおける検知手段が製氷完了水位を検知していない場合には、前記制御手段は異常が発生したと判定することを特徴とする。
請求項１の発明によれば、最初に製氷完了水位を検知したときからの経過時間に基づいて異常の判定を行なうようにしたので、製氷時間が遅延したり短縮されたりする異常を早い段階で検知することができる。従って、自動製氷機の復旧作業が容易となり、製氷部の変形・破損等が生ずるのを抑制し得る。 In order to solve the above-described problems and achieve the intended purpose suitably, the abnormality detection method for an automatic ice maker according to claim 1 of the present application is:
An ice making part cooled by a refrigerant supplied from a refrigeration system, an ice making water tank for storing ice making water, a circulation pump for supplying ice making water stored in the ice making water tank to the ice making part, and the ice making water tank And detecting means for detecting the amount of ice making water in the tank, and configured to collect uniced water that has been supplied to the ice making unit and does not freeze in an ice making operation in an ice making water tank. The ice making unit is equipped with a plurality of ice making units, and when the ice making operation is performed, when all the detecting means detect that the ice making water in the ice making water tank has reached the ice making completion level, the control means for determining that the ice making is completed is provided. In an automatic ice maker,
When the first abnormality occurrence time elapses after the detection means in any ice making unit first detects the ice making completion water level, the detection means in any other ice making unit detects the ice making completion water level. If not, the control means determines that an abnormality has occurred.
According to the first aspect of the present invention, the abnormality is determined based on the elapsed time from when the ice making completion water level is first detected, so that an abnormality in which the ice making time is delayed or shortened at an early stage. Can be detected. Therefore, the recovery operation of the automatic ice making machine is facilitated, and deformation or breakage of the ice making unit can be suppressed.

請求項２に係る発明では、製氷運転の開始から予め設定された第２異常発生時間が経過するまでに、全ての製氷ユニットにおける検知手段が製氷完了水位を検知した場合に、前記制御手段は異常が発生したと判定する。
請求項２の発明によれば、全ての製氷ユニットにおいて製氷時間が短縮する異常が同時期に発生した場合であっても、当該異常を検知し得る。 In the invention according to claim 2, when the detection means in all the ice making units detects the ice making completion water level from the start of the ice making operation until the preset second abnormality occurrence time elapses, the control means is abnormal. Is determined to have occurred.
According to the invention of claim 2, even if an abnormality that shortens the ice making time occurs in all ice making units at the same time, the abnormality can be detected.

本発明に係る自動製氷機の異常検知方法によれば、製氷時間が遅延したり、短縮したりする異常を早期に検知することができる。   According to the abnormality detection method for an automatic ice maker according to the present invention, it is possible to detect an abnormality in which the ice making time is delayed or shortened at an early stage.

次に、本発明に係る自動製氷機の異常検知方法につき、好適な実施例を挙げて、添付図面を参照しながら以下説明する。なお、実施例では、自動製氷機として流下式製氷機を例に説明を行なう。また、以下の説明において、従来例で示した流下式製氷機と同一の部材については、同じ符号を付して詳細な説明は省略する。   Next, an abnormality detection method for an automatic ice making machine according to the present invention will be described below with reference to the accompanying drawings by giving a preferred embodiment. In the embodiment, a flow-down type ice maker will be described as an example of an automatic ice maker. Moreover, in the following description, about the same member as the flow-down type ice maker shown in the prior art example, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

図１は、実施例に係る異常検知方法が実行される流下式製氷機４０の概略構成を示す説明図であって、この流下式製氷機４０は、一対の製氷ユニット４１,４１を備えている。各製氷ユニット４１は、対向配置された一対の製氷板１６,１６を複数並列に配置して製氷部１４が構成され、各製氷板１６の間には、図示しない冷凍系から導出する蒸発管１８が蛇行配置されている。各蒸発管１８における製氷部１４の入口側に膨張弁４２が介挿され、該膨張弁４２を経て膨張気化した冷媒により製氷部１４を冷却するようになっている。   FIG. 1 is an explanatory diagram illustrating a schematic configuration of a flow-down ice maker 40 in which an abnormality detection method according to an embodiment is executed. The flow-down ice maker 40 includes a pair of ice making units 41 and 41. . Each ice making unit 41 includes a plurality of a pair of ice making plates 16, 16 arranged in parallel to form an ice making unit 14, and between each ice making plate 16, an evaporation pipe 18 led out from a refrigeration system (not shown). Is meandering. An expansion valve 42 is inserted on the inlet side of the ice making section 14 in each evaporation pipe 18, and the ice making section 14 is cooled by the refrigerant that has expanded and vaporized through the expansion valve 42.

各製氷ユニット４１における製氷部１４の下方に臨む位置には、他方の製氷ユニット４１側へ向けて下方傾斜する姿勢で氷案内板２０が設けられている。氷案内板２０には、複数の戻り孔２２が開設され、該戻り孔２２を介して未氷結水を製氷水タンク２４へ回収するようになっている。前記製氷水タンク２４には、フロートスイッチ(検知手段)２６が設けられ、該フロートスイッチ２６により製氷水の量を検知し得るようになっている。   An ice guide plate 20 is provided at a position facing the lower side of the ice making unit 14 in each ice making unit 41 so as to be inclined downward toward the other ice making unit 41. A plurality of return holes 22 are formed in the ice guide plate 20, and uniced water is collected into the ice making water tank 24 through the return holes 22. The ice making water tank 24 is provided with a float switch (detecting means) 26 so that the amount of ice making water can be detected by the float switch 26.

前記製氷水タンク２４には、製氷水供給管２８が連通接続され、該供給管２８を介して製氷水を製氷部１４へ供給するようになっている。この製氷水供給管２８には、循環ポンプ３０が設けられており、該循環ポンプ３０により製氷水タンク２４内の製氷水を圧送するようになっている。また、製氷水供給管２８は、製氷部１４の上方を延在する製氷水散水管３２に連通接続され、該製氷水散水管３２を介して製氷水を各製氷板１６の製氷面へ散布供給するようになっている。   An ice making water supply pipe 28 is connected in communication with the ice making water tank 24, and ice making water is supplied to the ice making unit 14 through the supply pipe 28. The ice making water supply pipe 28 is provided with a circulation pump 30, and the ice making water in the ice making water tank 24 is pumped by the circulation pump 30. The ice making water supply pipe 28 is connected to an ice making water sprinkling pipe 32 extending above the ice making section 14, and the ice making water is sprayed and supplied to the ice making surfaces of the ice making plates 16 through the ice making water sprinkling pipe 32. It is supposed to be.

前記製氷水タンク２４には、製氷完了時に製氷水タンク２４内に残留した余剰の製氷水(余剰水)を排出する排出管４４が設けられている。この排出管４４には、図示しないバネ等の付勢手段によって、常には排出管４４を閉成する方向へ付勢された排水弁４６が介挿されている。すなわち、通常時には、製氷水タンク２４内の製氷水の水圧により排水弁４６が自然に開放されることはなく、製氷水が排出されることはない。一方、製氷運転終了時に、前記循環ポンプ３０が逆回転(製氷水の供給時とは反対の方向)すると、水圧により付勢手段の付勢力に抗して排水弁４６が開放され、余剰水が外部へ排出されるようになっている。   The ice making water tank 24 is provided with a discharge pipe 44 for discharging excess ice making water (surplus water) remaining in the ice making water tank 24 when ice making is completed. A drain valve 46 that is always urged in a direction to close the discharge pipe 44 by an urging means such as a spring (not shown) is inserted in the discharge pipe 44. That is, normally, the drain valve 46 is not naturally opened by the water pressure of the ice making water in the ice making water tank 24, and the ice making water is not discharged. On the other hand, at the end of the ice making operation, when the circulation pump 30 rotates in the reverse direction (in the direction opposite to that when the ice making water is supplied), the drain valve 46 is opened against the urging force of the urging means by the water pressure, and the excess water is discharged. It is designed to be discharged outside.

前記両製氷ユニット４１,４１の製氷水タンク２４,２４の下方には、上方に開口した貯氷庫３４が設けられ、両ユニット４１,４１の製氷部１４,１４で製造された氷塊を貯溜するようになっている。貯氷庫３４の内部には、氷塊の満杯時に作動する貯氷検知手段３６が、両製氷ユニット４１,４１の略中央(両氷案内板２０,２０の中間線上)に位置するよう１つだけ設けられている。すなわち、貯氷検知手段３６を両ユニット４１,４１の略中央位置に設けることで、貯氷庫３４内に堆積する氷塊の山の裾部が重なる部位(図１の符号Ａ参照)を検知するようになっている。   Below the ice making water tanks 24, 24 of both ice making units 41, 41, an ice storage 34 opened upward is provided so as to store ice blocks produced by the ice making parts 14, 14 of both units 41, 41. It has become. Inside the ice storage 34, only one ice storage detecting means 36 that operates when the ice block is full is provided so as to be located at the approximate center of both ice making units 41, 41 (on the middle line between both ice guide plates 20, 20). ing. In other words, by providing the ice storage detection means 36 at a substantially central position between the units 41 and 41, a portion (see reference numeral A in FIG. 1) where the hems of the ice blocks piled up in the ice storage 34 overlap is detected. It has become.

前記流下式製氷機４０は、統括的な運転制御を行なうと共に、各フロートスイッチ２６からの検知信号に基づいて運転の異常判定を行なう制御手段４８を備えている。制御手段４８は、後述するように２つのタイマー(第１タイマー５０および第２タイマー５２)を内蔵しており、両タイマー５０,５２の作動制御を行なう。制御手段４８は、各フロートスイッチ２６と電気的に接続され、フロートスイッチ２６が製氷完了水位を検知したときに、その検知信号を受信する。そして、全てのフロートスイッチ２６,２６からの検知信号を受信したときに、制御手段４８は製氷完了の判定を行なうよう設定される。   The flow-down type ice making machine 40 includes control means 48 that performs overall operation control and performs operation abnormality determination based on detection signals from the float switches 26. As will be described later, the control means 48 incorporates two timers (first timer 50 and second timer 52), and controls the operation of both timers 50 and 52. The control means 48 is electrically connected to each float switch 26, and receives the detection signal when the float switch 26 detects the ice making completion water level. When the detection signals from all the float switches 26, 26 are received, the control means 48 is set so as to determine whether ice making is complete.

また、制御手段４８は、製氷完了水位を最初に検知したフロートスイッチ２６の検知信号を受信したときから、予め設定された第１異常発生時間の経過時に他方の製氷ユニット４１(他の何れかの製氷ユニット４１)におけるフロートスイッチ２６からの検知信号(最後の製氷完了水位の検知)を受信していない場合には、何れかの製氷ユニット４１に異常が発生したと判定するよう設定される。すなわち、制御手段４８は、両製氷ユニット４１,４１における製氷時間の差(以後、製氷時間差という)に基づいて、異常判定を行なうようになっている。この製氷時間差は、前記第１タイマー５０により計時されるようになっている。すなわち、第１タイマー５０は、フロートスイッチ２６からの検知信号を制御手段４８が最初に受信したときに作動を開始することで、製氷時間差を計時するようになっている。これにより、一方の製氷ユニット４１に異常が発生して製氷時間差が大きくなった場合、制御手段４８は、異常判定を行なって当該異常を検知し得る。更に、制御手段４８は、第１タイマー５０の計時時刻が第１異常発生時間を経過した時点で一律に異常判定を行なうので、一方の製氷ユニット４１に製氷完了水位が検知不能となる異常が発生したとしても(例えば、製氷不能により製氷水が減少しなくなる等)、当該異常を早期に検知することが可能となる。なお、前記第１異常発生時間は、流下式製氷機４０の製氷能力や設置環境等に応じて設定され、また、その設定値を図示しないコントロールパネルを介して自由に変更し得るようになっている。実施例では、第１異常発生時間を５分に設定してある。   Further, the control means 48 receives the detection signal from the float switch 26 that first detects the ice making completion water level, and when the preset first abnormality occurrence time has elapsed, the other ice making unit 41 (any other ice making unit 41). When the detection signal from the float switch 26 (detection of the final ice making water level) in the ice making unit 41) is not received, it is set to determine that an abnormality has occurred in any ice making unit 41. That is, the control means 48 makes an abnormality determination based on the difference in ice making time between the ice making units 41 and 41 (hereinafter referred to as the ice making time difference). This difference in ice making time is measured by the first timer 50. That is, the first timer 50 starts the operation when the control means 48 first receives a detection signal from the float switch 26, thereby measuring the ice making time difference. As a result, when an abnormality occurs in one ice making unit 41 and the ice making time difference becomes large, the control means 48 can perform abnormality determination to detect the abnormality. Further, since the control means 48 uniformly determines the abnormality when the time measured by the first timer 50 has passed the first abnormality occurrence time, an abnormality in which the ice making completion water level cannot be detected occurs in one ice making unit 41. Even if it is performed (for example, ice making water is not reduced due to the inability to make ice), the abnormality can be detected at an early stage. The first abnormality occurrence time is set according to the ice making capacity and installation environment of the flow-down type ice making machine 40, and the set value can be freely changed via a control panel (not shown). Yes. In the embodiment, the first abnormality occurrence time is set to 5 minutes.

また、前記制御手段４８は、製氷運転の開始から最後のフロートスイッチ２６からの製氷完了の検知信号を受信するまでの時間(製氷完了時間)が、予め設定された第２異常発生時間内であるときは、両製氷ユニット４１,４１に同時期に異常が発生したと判定するよう設定される。この製氷完了時間は、第２タイマー５２が計時するようになっている。すなわち、第２タイマー５２は、製氷運転の開始から最後に製氷完了水位の検知信号を制御手段４８が受信するまでの間作動することで、製氷完了時間を計時するようになっている。なお、第２異常発生時間についても、第１異常発生時間と同様に、製氷機の機種に応じて適宜設定され、また、その設定値はコントロールパネルを介して変更し得るようになっている。実施例では、第２異常発生時間を１５分に設定してある。   Further, the control means 48 has a time (ice making completion time) from the start of the ice making operation to reception of the ice making completion detection signal from the last float switch 26 within the preset second abnormality occurrence time. Is set to determine that an abnormality has occurred in both ice making units 41 and 41 at the same time. The ice making completion time is measured by the second timer 52. That is, the second timer 52 is operated from the start of the ice making operation until the control means 48 receives the ice making completion water level detection signal at the end, thereby measuring the ice making completion time. Note that the second abnormality occurrence time is also set as appropriate according to the type of ice making machine, as with the first abnormality occurrence time, and the set value can be changed via the control panel. In the embodiment, the second abnormality occurrence time is set to 15 minutes.

(実施例の作用)
次に、実施例に係る流下式製氷機４０の作用について、図２のフローチャートを参照して説明する。先ず始めに、正常な場合について説明すると、製氷運転に際しては、両製氷ユニット４１,４１の循環ポンプ３０,３０が作動して、該循環ポンプ３０,３０により製氷水タンク２４,２４内の製氷水が製氷水供給管２８,２８および製氷水散水管３２,３２を介して各製氷部１４の製氷面に供給される。また、冷凍系から各蒸発管１８に冷媒が供給され、該冷媒により製氷部１４が冷却される。このとき、制御手段４８は、製氷運転の開始と共に第２タイマー５２を作動させ、製氷完了時間の計時を開始させる(ステップＳ１)。各製氷部１４へ供給された製氷水は、製氷面を流下する間に熱交換され、次第に製氷面で氷結を始める。そして、製氷面で製氷水が氷結されるに従い、製氷水タンク２４内の製氷水は減少し、各フロートスイッチ２６のフロートが下降していく。 (Operation of Example)
Next, the operation of the flow-down ice making machine 40 according to the embodiment will be described with reference to the flowchart of FIG. First, a normal case will be described. During ice making operation, the circulation pumps 30 and 30 of both ice making units 41 and 41 are operated, and the ice making water in the ice making water tanks 24 and 24 is operated by the circulation pumps 30 and 30. Is supplied to the ice making surface of each ice making unit 14 through the ice making water supply pipes 28 and 28 and the ice making water sprinkling pipes 32 and 32. In addition, a refrigerant is supplied from the refrigeration system to each evaporation pipe 18, and the ice making unit 14 is cooled by the refrigerant. At this time, the control means 48 activates the second timer 52 simultaneously with the start of the ice making operation, and starts measuring the ice making completion time (step S1). The ice making water supplied to each ice making unit 14 is heat-exchanged while flowing down the ice making surface, and gradually starts freezing on the ice making surface. As the ice making water freezes on the ice making surface, the ice making water in the ice making water tank 24 decreases and the float of each float switch 26 descends.

そして、一方の製氷ユニット４１(例えば、図１の左側)における製氷水タンク２４の製氷水が最初に製氷完了水位に到達したとすると、フロートスイッチ２６がこれを検知し、制御手段４８は、該フロートスイッチ２６から検知信号を受信する(最初の製氷完了水位の検知，ステップＳ２のＹｅｓ)。すると、制御手段４８は、第１タイマー５０を作動させ(ステップＳ３)、該第１タイマー５０に製氷時間差を計時させる。   When the ice making water in the ice making water tank 24 in one ice making unit 41 (for example, the left side in FIG. 1) first reaches the ice making completion water level, the float switch 26 detects this, and the control means 48 A detection signal is received from the float switch 26 (detection of the first ice-making completed water level, Yes in step S2). Then, the control means 48 operates the first timer 50 (step S3), and causes the first timer 50 to measure the ice making time difference.

次いで、制御手段４８は、第１タイマー５０の計時時刻が第１異常発生時間を経過しているか否か判定する(ステップＳ４のＹｅｓ)。第１タイマー５０の計時時刻が第１異常発生時間を経過していない場合(ステップＳ４のＮｏ)、制御手段４８は、他方の製氷ユニット４１が製氷を完了したか否か(最後の製氷完了水位)を判定する(ステップＳ５)。ここで、正常運転の場合、両製氷ユニット４１,４１の製氷が完了するタイミングは大きくずれることがなく、製氷時間差は小さいので(例えば、１分程度)、第１タイマー５０の計時時刻が第１異常発生時間を経過する前に(ステップＳ４のＮｏ)、他方の製氷ユニット４１の製氷が完了する(ステップＳ５のＹｅｓ)。すなわち、正常な場合、最後の製氷完了水位は、第１異常発生時間内に検知される。   Next, the control means 48 determines whether or not the time measured by the first timer 50 has passed the first abnormality occurrence time (Yes in step S4). When the time measured by the first timer 50 has not passed the first abnormality occurrence time (No in step S4), the control means 48 determines whether or not the other ice making unit 41 has completed ice making (the last ice making completion water level). ) Is determined (step S5). Here, in the normal operation, the ice making timings of both ice making units 41 and 41 are not greatly shifted, and the difference in ice making time is small (for example, about 1 minute), so the time measured by the first timer 50 is the first time. Before the abnormality occurrence time elapses (No in Step S4), the ice making of the other ice making unit 41 is completed (Yes in Step S5). That is, when normal, the last ice-making completed water level is detected within the first abnormality occurrence time.

すると制御手段４８は、第１タイマー５０を停止(ＯＦＦ)させ(ステップＳ６)、次に第２タイマー５２の計時時刻(製氷完了時間)が第２異常発生時間内であるか否か判定する(ステップＳ７)。正常運転であれば、製氷完了時間は第２異常発生時間より大きいので(ステップＳ７のＮｏ)、制御手段４８は、正常判定を行ない、第２タイマー５２を停止させる(ステップＳ８)。そして、製氷運転を終了させ、除氷運転へ移行する(ステップＳ９，ステップＳ１０)。なお、製氷運転終了時に製氷水タンク２４内に残留する余剰水は、不純物が濃縮しているので、制御手段４８は、除氷運転へ移行する前に余剰水を排出する。すなわち、制御手段４８は、各製氷ユニット４１の循環ポンプ３０を逆回転させ、排水弁４６を強制開放して余剰水を外部へ排出する。   Then, the control means 48 stops (OFF) the first timer 50 (step S6), and then determines whether or not the time measured by the second timer 52 (ice making completion time) is within the second abnormality occurrence time ( Step S7). If the operation is normal, the ice making completion time is longer than the second abnormality occurrence time (No in step S7), so the control means 48 makes a normal determination and stops the second timer 52 (step S8). Then, the ice making operation is terminated, and the process moves to the deicing operation (steps S9 and S10). The surplus water remaining in the ice making water tank 24 at the end of the ice making operation is concentrated in impurities, so the control means 48 discharges the surplus water before shifting to the deicing operation. That is, the control means 48 reversely rotates the circulation pump 30 of each ice making unit 41, forcibly opens the drain valve 46, and discharges excess water to the outside.

除氷運転に移行すると、両製氷ユニット４１,４１の蒸発管１８,１８にホットガスが供給されると共に、図示しない除氷水散水管から常温の除氷水が製氷板１６の裏面に供給される。すると、前記製氷部１４は、ホットガスおよび除氷水により加熱され、前記製氷面に形成された氷塊と該製氷面との氷結が融解し、該氷塊は製氷面を滑落する。各製氷部１４から落下した氷塊は、前記氷案内板２０に受け止められ、該案内板２０により前記貯氷庫３４へ案内される。このとき、氷塊は、貯氷庫３４内において２つの山を形成するように堆積されていく(図１参照)。以後同様にして製氷運転および除氷運転が繰り返され、自動製氷が行なわれる。なお、貯氷庫３４内の氷塊が満杯になると、前記貯氷検知手段３６が２つの山が重なる部分Ａの氷塊を検知し、制御手段４８は氷塊が満杯となったと判定する。すると、制御手段４８は、貯氷検知手段３６が氷塊を検知しなくなるまで、製氷運転を中止する制御を行なう。このように、貯氷検知手段３６を両製氷ユニット４１,４１の中央位置に設けることで、各ユニット４１毎に貯氷検知手段３６を設ける必要がなく、製品コストを低廉にし得る。   When the deicing operation is performed, hot gas is supplied to the evaporation pipes 18 and 18 of both ice making units 41 and 41, and normal temperature deicing water is supplied to the back surface of the ice making plate 16 from a deicing water sprinkling pipe (not shown). Then, the ice making unit 14 is heated by hot gas and deicing water, the ice blocks formed on the ice making surface and the freezing of the ice making surface are melted, and the ice blocks slide down the ice making surface. Ice blocks falling from each ice making unit 14 are received by the ice guide plate 20 and guided to the ice storage 34 by the guide plate 20. At this time, the ice blocks are accumulated so as to form two mountains in the ice storage 34 (see FIG. 1). Thereafter, the ice making operation and the deicing operation are repeated in the same manner, and automatic ice making is performed. When the ice block in the ice storage 34 is full, the ice storage detection unit 36 detects the ice block in the portion A where two mountains overlap, and the control unit 48 determines that the ice block is full. Then, the control means 48 performs control to stop the ice making operation until the ice storage detection means 36 no longer detects ice blocks. Thus, by providing the ice storage detection means 36 at the center position of both ice making units 41, 41, it is not necessary to provide the ice storage detection means 36 for each unit 41, and the product cost can be reduced.

(製氷時間の遅延を招く異常が生じた場合について)
例えば、膨張弁４２の開閉不良や製氷板１６に汚れが付着することで、当該製氷板１６に氷塊が製造され難くなったり、氷塊が全く製造されなくなったとする。すると、他の製氷板１６で製造される氷塊が大きくなり、異常が発生した製氷ユニット４１の製氷時間に遅延が生ずる。一方、正常な製氷ユニット４１の製氷運転は通常通り進行するため、該製氷ユニット４１における製氷水タンク２４内の製氷水の減少は、異常が生じた製氷ユニット４１のように遅延が生じない。この場合、制御手段４８は、正常な製氷ユニット４１のフロートスイッチ２６から最初の製氷完了水位の検知信号を受信することとなる(ステップＳ２のＹｅｓ)。すると、制御手段４８は、第１タイマー５０を作動させ(ステップＳ３)、製氷時間差の計時を開始させる。 (If an abnormality occurs that delays ice making time)
For example, it is assumed that an ice block is difficult to manufacture on the ice making plate 16 or the ice block is not manufactured at all due to poor opening / closing of the expansion valve 42 or dirt attached to the ice making plate 16. Then, the ice blocks produced by the other ice making plates 16 become large, and the ice making time of the ice making unit 41 in which an abnormality has occurred is delayed. On the other hand, since the ice making operation of the normal ice making unit 41 proceeds as usual, the decrease in ice making water in the ice making water tank 24 in the ice making unit 41 is not delayed as in the ice making unit 41 in which an abnormality has occurred. In this case, the control means 48 receives the detection signal of the first ice making completion water level from the float switch 26 of the normal ice making unit 41 (Yes in step S2). Then, the control means 48 operates the 1st timer 50 (step S3), and starts the time measurement of ice making time difference.

前述のように、異常が発生した製氷ユニット４１では製氷時間に遅延が生じているため、第１異常発生時間を経過しても当該製氷ユニット４１における製氷は完了していない。従って、他方の製氷ユニット４１からの製氷完了の信号を受信しないまま第１タイマー５０の計時時刻が第１異常発生時間を経過することとなる(ステップＳ４のＹｅｓ)。すると、制御手段４８は、何れかの製氷ユニット４１に異常が発生したと判定して第１タイマー５０を停止させる(ステップＳ１１)。そして、制御手段４８は、製氷運転を終了させ(ステップＳ１２)、除氷運転を行なった後に流下式製氷機４０の運転を異常停止させる(ステップＳ１３，ステップＳ１４)。   As described above, since the ice making unit 41 in which an abnormality has occurred has a delay in the ice making time, ice making in the ice making unit 41 is not completed even after the first abnormality occurrence time has elapsed. Accordingly, the time measured by the first timer 50 passes the first abnormality occurrence time without receiving the ice making completion signal from the other ice making unit 41 (Yes in step S4). Then, the control means 48 determines that an abnormality has occurred in any one of the ice making units 41 and stops the first timer 50 (step S11). Then, the control means 48 terminates the ice making operation (step S12), and abnormally stops the operation of the flow down type ice making machine 40 after performing the deicing operation (step S13, step S14).

このように、実施例にかかる異常検知方法によれば、最初の製氷完了水位を検知してからの経過時間に基づいて異常の判定を行なうようにしたので、氷塊が巨大となる前の早い段階で異常を検知することができる。従って、流下式製氷機４０の復旧作業が容易となり、製氷板１６が変形したり、破損したりするのを防止し得る。また、第１異常発生時間を経過すると一律に異常判定を行なうようにしたので、他の製氷完了水位の検知信号を待つ必要がなく、異常の早期発見が可能となる。なお、このような製氷時間が遅延する要因としては、上記のケースに限られる訳ではない。例えば、一方の循環ポンプ３０が故障により出力低下を起こし、製氷水の製氷部１４への供給量が減少した場合にも、製氷時間が遅延する異常が発生し得る。また、何れかの製氷ユニット４１における製氷水供給管２８や製氷水散水管３２に異物が詰まり、製氷水が製氷板１６の一部または全部に供給されなくなった場合にも、製氷時間の遅延は生じ得る。   As described above, according to the abnormality detection method according to the embodiment, the abnormality is determined based on the elapsed time after the first ice-making completion water level is detected, so that an early stage before the ice block becomes huge Can detect abnormalities. Therefore, the recovery operation of the flow-down ice making machine 40 is facilitated, and the ice making plate 16 can be prevented from being deformed or damaged. Further, since the abnormality determination is uniformly performed after the first abnormality occurrence time has elapsed, it is not necessary to wait for another ice making completion water level detection signal, and an abnormality can be detected early. In addition, as a factor which delays such ice making time, it is not necessarily restricted to said case. For example, even when one of the circulation pumps 30 has a reduced output due to a failure and the supply amount of ice making water to the ice making unit 14 is reduced, an abnormality in which the ice making time is delayed may occur. In addition, when the ice making water supply pipe 28 or the ice making water sprinkling pipe 32 in any of the ice making units 41 is clogged with foreign matter and the ice making water is not supplied to a part or all of the ice making plate 16, the ice making time is delayed. Can occur.

(製氷時間の短縮を招く異常が生じた場合について)
例えば、多重製氷により連結氷が発生し、しかも、除氷運転において連結氷が製氷部１４から落下して氷案内板２０に引っ掛かってしまうことがある。すると、製氷運転中の未氷結水が、氷案内板２０に引っ掛かった連結氷を伝って貯氷庫３４等へ放出されてしまい、製氷水タンク２４に回収されなくなることがある。すると、当該製氷水タンク２４における製氷水は早く減少し、異常が生じている製氷ユニット４１のフロートスイッチ２６が製氷完了水位を通常よりも早いタイミングで検知する。この場合、制御手段４８は、異常(連結氷)が生じた側の製氷ユニットにおけるフロートスイッチ２６から検知信号を受信し(ステップＳ２のＹｅｓ)、第１タイマー５０を作動させる(ステップＳ３)。 (If an abnormality occurs that shortens the ice making time)
For example, coupled ice may be generated by multiple ice making, and the connected ice may fall from the ice making unit 14 and get caught on the ice guide plate 20 in the deicing operation. As a result, unfrozen water during the ice making operation may be discharged to the ice storage 34 or the like through the connected ice caught on the ice guide plate 20 and may not be collected in the ice making water tank 24. Then, the ice making water in the ice making water tank 24 decreases quickly, and the float switch 26 of the ice making unit 41 in which an abnormality has occurred detects the ice making completion water level at an earlier timing than usual. In this case, the control means 48 receives the detection signal from the float switch 26 in the ice making unit on the side where the abnormality (connected ice) has occurred (Yes in step S2), and activates the first timer 50 (step S3).

一方、正常な製氷ユニット４１では、通常通り製氷運転が進行しているので、両ユニット４１,４１の製氷時間差は大きく、最初の製氷完了水位の検知から第１異常発生時間内に正常な製氷ユニット４１から製氷完了水位の検知信号を受信することができなくなる。すなわち、正常な製氷ユニット４１からの製氷完了水位の検知信号を受信する前に第１タイマー５０の計時時刻が第１異常発生時間を経過するので(ステップＳ４のＹｅｓ)、制御手段４８は、何れかの製氷ユニット４１に異常が発生したと判定し(ステップＳ１１)、製氷運転を終了させる(ステップＳ１２)。そして、除氷運転を行なった後に流下式製氷機４０の運転を停止させる(ステップＳ１３,Ｓ１４)。このように、実施例に係る異常検知方法によれば、製氷時間の短縮を招く異常が生じた場合であっても、早い段階で当該異常を検知し得る。   On the other hand, in the normal ice making unit 41, since the ice making operation is proceeding as usual, the ice making time difference between the units 41 and 41 is large, and the normal ice making unit is detected within the first abnormality occurrence time from the detection of the first ice making completed water level. It becomes impossible to receive the detection signal of the ice making completion water level from 41. That is, since the time measured by the first timer 50 passes the first abnormality occurrence time before receiving the detection signal of the ice making completion water level from the normal ice making unit 41 (Yes in step S4), the control means 48 It is determined that an abnormality has occurred in the ice making unit 41 (step S11), and the ice making operation is terminated (step S12). Then, after the deicing operation is performed, the operation of the flow-down ice making machine 40 is stopped (steps S13 and S14). Thus, according to the abnormality detection method according to the embodiment, even when an abnormality that causes a reduction in ice making time occurs, the abnormality can be detected at an early stage.

なお、製氷時間の短縮を招く要因としては、上記のケースに限定される訳ではない。例えば、何れかの製氷水タンク２４に設けられた排出管４４の排水弁４６に異物が噛込み、該排水弁４６が常に開放状態となる場合が考えられる。この場合、前記製氷水タンク２４内の製氷水は、自然に排出管４４を介して排出され、当該製氷水タンク２４のフロートスイッチ２６は、非常に早い段階で製氷完了水位を検知する。また、他のケースとしては、貯氷庫３４に設けられた貯氷検知手段３６が故障すると、貯氷庫３４内が氷塊で満たされているのに拘らず、製氷運転・除氷運転が継続されてしまう。すると、氷塊が氷案内板２０まで溢れてしまい、当該溢れた氷によって製氷運転時に未氷結水が製氷水タンク２４へ回収されるのが妨げられてしまう。従って、当該異常が発生した製氷ユニット４１では、製氷水の減少が早くなり、フロートスイッチ２６は非常に早いタイミングで製氷完了水位を検知することとなる。   It should be noted that the factor causing the ice making time to be shortened is not limited to the above case. For example, there may be a case where foreign matter is caught in the drain valve 46 of the discharge pipe 44 provided in any one of the ice making water tanks 24 and the drain valve 46 is always open. In this case, the ice making water in the ice making water tank 24 is naturally discharged through the discharge pipe 44, and the float switch 26 of the ice making water tank 24 detects the ice making completion water level at a very early stage. As another case, when the ice storage detection means 36 provided in the ice storage 34 breaks down, the ice making operation and the deicing operation are continued even though the ice storage 34 is filled with ice blocks. . Then, the ice block overflows to the ice guide plate 20, and the overflowed ice prevents uncondensed water from being collected in the ice making water tank 24 during the ice making operation. Therefore, in the ice making unit 41 in which the abnormality has occurred, the ice making water decreases quickly, and the float switch 26 detects the ice making completion water level at a very early timing.

(両製氷ユニットに同時期に異常が発生した場合について)
万が一、製氷時間の短縮を招く異常が両製氷ユニット４１,４１に同時期に発生した場合、両ユニット４１,４１の製氷時間差は小さく、第１タイマー５０の計時時刻が第１異常発生時間を経過する前に(ステップＳ４のＮｏ)、最後の製氷完了水位が検知されてしまう(ステップＳ５のＹｅｓ)。このため、前記制御手段４８は、ステップＳ４において異常判定をすることはない。しかしながら、この場合に制御手段４８は、第２タイマー５２の計時時刻(製氷完了時間)に基づいて異常を検知し得るようになっている。すなわち、制御手段４８は、製氷完了時間が第２異常発生時間内であるか否か判定し(ステップＳ７)、該製氷完了時間が第２異常発生時間より小さければ(ステップＳ７のＹｅｓ)、制御手段４８は、両製氷ユニット４１,４１に異常が同時期に発生したと判定する(ステップＳ１５)。すると、制御手段４８は、製氷運転を終了させ(ステップＳ１６)、除氷運転を行なった後に流下式製氷機４０の運転を停止させる(ステップＳ１７，ステップＳ１８)。このように、実施例に係る異常検知方法では、両製氷ユニット４１,４１に製氷時間が短縮される異常が同時期に発生したとしても、第２タイマー５２の計時時刻に基づいて当該異常を確実に検知することができる。 (When abnormalities occur in both ice making units at the same time)
In the unlikely event that an abnormality that reduces the ice making time occurs in both ice making units 41, 41, the difference in ice making time between both units 41, 41 is small, and the time measured by the first timer 50 has passed the first abnormality occurrence time. Before performing (No in step S4), the last ice making water level is detected (Yes in step S5). For this reason, the said control means 48 does not perform abnormality determination in step S4. However, in this case, the control means 48 can detect an abnormality based on the time measured by the second timer 52 (ice making completion time). That is, the control unit 48 determines whether or not the ice making completion time is within the second abnormality occurrence time (step S7), and if the ice making completion time is shorter than the second abnormality occurrence time (Yes in step S7), the control is performed. The means 48 determines that an abnormality has occurred in both ice making units 41, 41 at the same time (step S15). Then, the control means 48 ends the ice making operation (step S16), and stops the operation of the flow down type ice making machine 40 after performing the deicing operation (step S17, step S18). Thus, in the abnormality detection method according to the embodiment, even if an abnormality that reduces the ice making time occurs in both ice making units 41 and 41 at the same time, the abnormality is reliably detected based on the time measured by the second timer 52. Can be detected.

(変更例)
実施例では、製氷ユニット４１が２つの場合を例示したが、製氷ユニット４１を３つ以上備えた製氷機であっても本発明の異常検知方法を実施可能である。例えば、製氷ユニット４１を３つ備える場合の異常検知方法について、図３を参照にして簡単に説明すると、製氷運転の開始と同時に、第２タイマー５２が作動し(ステップＳ１)、製氷完了時間を計時する。次に、何れかの製氷ユニット４１において最初の製氷完了水位が検知されると(ステップＳ２のＹｅｓ)、制御手段４８は、第１タイマー５０を作動させる(ステップＳ３)。その後、制御手段４８は、第１タイマー５０の計時時刻が第１異常発生時間を経過したか否かを判定し(ステップＳ４)、異常が生じていない場合、第１異常発生時間内に他の製氷ユニット４１において次の(２番目の)製氷完了水位が検知される(ステップＳ４のＮｏ，ステップＳ５のＹｅｓ)。 (Example of change)
In the embodiment, the case where there are two ice making units 41 is illustrated, but the abnormality detection method of the present invention can be implemented even with an ice making machine including three or more ice making units 41. For example, the abnormality detection method when three ice making units 41 are provided will be briefly described with reference to FIG. 3. When the ice making operation starts, the second timer 52 operates (step S1), and the ice making completion time is set. Keep time. Next, when the first ice making completion water level is detected in any ice making unit 41 (Yes in step S2), the control means 48 activates the first timer 50 (step S3). Thereafter, the control means 48 determines whether or not the time measured by the first timer 50 has passed the first abnormality occurrence time (step S4). If no abnormality has occurred, the control means 48 determines another time within the first abnormality occurrence time. The next (second) ice making completion water level is detected in the ice making unit 41 (No in step S4, Yes in step S5).

すると、制御手段４８は、再び第１タイマー５０の計時時刻が第１異常発生時間を経過したか否か判定する(ステップＳ６)。ここで、残る製氷ユニット４１において製氷時間が遅延する異常が生じているとすると、最後の(３番目の)製氷完了水位は第１異常発生時間内に検知されることはないので(ステップＳ６のＹｅｓ)、制御手段４８は、異常判定を行なって製氷運転を終了させる(ステップＳ８，ステップＳ９)。そして、除氷運転をした後、製氷機を異常停止させる(ステップＳ１０，ステップＳ１１)。   Then, the control means 48 determines again whether the time measured by the first timer 50 has passed the first abnormality occurrence time (step S6). Here, if the remaining ice making unit 41 has an abnormality in which the ice making time is delayed, the last (third) ice making completion water level is not detected within the first abnormality occurrence time (in step S6). Yes), the control means 48 makes an abnormality determination and ends the ice making operation (steps S8 and S9). Then, after the deicing operation, the ice making machine is abnormally stopped (step S10, step S11).

なお、最初に製氷完了水位が検知された製氷ユニット４１以外の製氷ユニット４１,４１に何れも製氷時間が遅延する異常が生じている場合、２番目の製氷完了水位を検知する前に、第１タイマー５０の計時時刻が第１異常発生時間を経過することとなる(ステップＳ４のＹｅｓ)。すなわち、最初以外の製氷ユニット４１,４１から製氷完了水位を検知する前に第１異常発生時間が経過するので、制御手段４８は、異常判定を行なう(ステップＳ１２〜Ｓ１５参照)。また、何れの製氷ユニット４１,４１,４１も正常である場合には(ステップＳ７のＹｅｓ)、実施例と同様に、第１タイマー５０を停止させ(ステップＳ１６)、次に、第２タイマー５２の計時時刻(製氷完了時間)が第２異常発生時間内であるか否か判定する(ステップＳ１７)。正常な場合(ステップＳ１７のＮｏ)、制御手段４８は、正常判定を行なう(ステップＳ１８〜Ｓ２０)。一方、３つの製氷ユニット４１,４１,４１に対し同時期に異常が発生した場合には、第２タイマー５２の計時時刻が第２異常発生時間内であるので(ステップＳ１７のＹｅｓ)、制御手段４８は異常判定を行なう(ステップＳ２１〜Ｓ２４)。   In the case where there is an abnormality that causes the ice making time to be delayed in any of the ice making units 41, 41 other than the ice making unit 41 in which the ice making completion water level is detected first, the first ice making completion water level is detected before the second ice making completion water level is detected. The time measured by the timer 50 passes the first abnormality occurrence time (Yes in step S4). That is, since the first abnormality occurrence time elapses before the ice making completion water level is detected from the ice making units 41, 41 other than the first, the control means 48 performs abnormality determination (see steps S12 to S15). If any of the ice making units 41, 41, 41 is normal (Yes in step S7), the first timer 50 is stopped (step S16) as in the embodiment, and then the second timer 52 is used. It is determined whether or not the measured time (ice making completion time) is within the second abnormality occurrence time (step S17). If normal (No in step S17), the control means 48 determines normality (steps S18 to S20). On the other hand, if an abnormality occurs in the three ice making units 41, 41, 41 at the same time, the time measured by the second timer 52 is within the second abnormality occurrence time (Yes in step S17), so that the control means 48 performs an abnormality determination (steps S21 to S24).

このように、製氷ユニット４１を３つ有する場合であっても、最初に製氷完了を検知したときからの経過時間に基づいて異常判定を行なうので、早い段階で異常を検知することができる。なお、製氷時間が短縮する異常が生じた場合も、同様な手順で異常が検知される。   As described above, even when the three ice making units 41 are provided, the abnormality determination is performed based on the elapsed time since the first completion of ice making is detected, so that the abnormality can be detected at an early stage. Even when an abnormality that shortens the ice making time occurs, the abnormality is detected in the same procedure.

なお、実施例では、検知手段としてフロートスイッチ２６を採用したが、製氷完了水位を検知し得るものであれば、水位センサー等、他の手段を適宜採用することができる。また、実施例では、自動製氷機として、各製氷部１４を製氷水が流下する流下式製氷機４０を例に説明したが、例えば、複数の製氷ユニットを備えた噴射式製氷機等、他の自動製氷機に本発明に係る異常検知方法を実施することも可能である。更に、実施例では、第１タイマー５０および第２タイマー５２を用いて異常判定を行なうようにしたが、１つのタイマーで製氷時間差および製氷時間を計時するようにしてもよい。   In the embodiment, the float switch 26 is used as the detecting means. However, other means such as a water level sensor can be appropriately used as long as the ice making completion water level can be detected. Further, in the embodiment, the flow-down type ice making machine 40 in which ice making water flows down each ice making unit 14 has been described as an example of an automatic ice making machine. However, for example, other types of ice making machines including a plurality of ice making units, etc. It is also possible to implement the abnormality detection method according to the present invention in an automatic ice making machine. Further, in the embodiment, the abnormality determination is performed using the first timer 50 and the second timer 52, but the ice making time difference and the ice making time may be measured by one timer.

なお、実施例に係る異常検知方法に加え、従来例で説明した異常検知方法を組み合せて異常を検知する方法も可能である。すなわち、全てのフロートスイッチ２６が製氷完了水位を検知したとき(製氷完了時間)が、予め設定された異常発生時間を越えた場合にも、制御手段４８が異常判定を行なうようにしてもよい。これにより、全ての製氷ユニット４１に製氷時間が遅延する異常が同時期に発生した場合であっても、異常を検知することが可能となる。また、製氷運転の開始後、最初の製氷完了水位が検知されるまでの時間が所定の時間内である場合に、制御手段４８が異常判定を行なう方法を加えてもよい。   In addition to the abnormality detection method according to the embodiment, a method of detecting an abnormality by combining the abnormality detection methods described in the conventional examples is also possible. In other words, when all the float switches 26 detect the ice making completion water level (ice making completion time), the control means 48 may make an abnormality determination even when a preset abnormality occurrence time is exceeded. As a result, even if an abnormality in which the ice making time is delayed occurs in all the ice making units 41 at the same time, the abnormality can be detected. Further, a method may be added in which the control means 48 performs an abnormality determination when the time from when the ice making operation is started until the first ice making completion water level is detected is within a predetermined time.

実施例に係る流下式製氷機の全体構成を示す概略図である。It is the schematic which shows the whole structure of the flow-down type ice making machine which concerns on an Example. 流下式製氷機の運転方法を示すフローチャートである。It is a flowchart which shows the operating method of a flow-down type ice maker. 変更例に係る流下式製氷機の運転方法を示すフローチャートである。It is a flowchart which shows the operating method of the flow-down type ice maker which concerns on the example of a change. 従来例に係る流下式製氷機の全体構成を示す概略図である。It is the schematic which shows the whole structure of the flow-down type ice making machine which concerns on a prior art example.

符号の説明Explanation of symbols

１４ 製氷部，２４ 製氷水タンク，２６ フロートスイッチ(検知手段)
３０ 循環ポンプ，４１ 製氷ユニット，４８ 制御手段 14 ice making part, 24 ice making water tank, 26 float switch (detection means)
30 circulation pump, 41 ice making unit, 48 control means

Claims (2)

冷凍系から供給される冷媒により冷却される製氷部(14)と、製氷水を貯溜する製氷水タンク(24)と、前記製氷水タンク(24)に貯溜された製氷水を前記製氷部(14)へ供給する循環ポンプ(30)と、前記製氷水タンク(24)に設けられ、該タンク(24)内の製氷水の量を検知する検知手段(26)とを有し、製氷運転において、前記製氷部(14)へ供給されて氷結に至らなかった未氷結水を製氷水タンク(24)で回収するよう構成された製氷ユニット(41)を複数備え、製氷運転に際し、全ての検知手段(26,26)が製氷水タンク(24)内の製氷水が製氷完了水位に到達したのを検知したときに、製氷が完了したと判定する制御手段(48)を備えた自動製氷機において、
何れかの製氷ユニット(41)における検知手段(26)が、最初に製氷完了水位を検知したときから予め設定された第１異常発生時間の経過時に、他の何れかの製氷ユニット(41)における検知手段(26)が製氷完了水位を検知していない場合には、前記制御手段(48)は異常が発生したと判定する
ことを特徴とする自動製氷機の異常検知方法。 An ice making part (14) cooled by a refrigerant supplied from a refrigeration system, an ice making water tank (24) for storing ice making water, and the ice making water stored in the ice making water tank (24) in the ice making part (14 In the ice making water tank (24), and a detecting means (26) for detecting the amount of ice making water in the tank (24), in ice making operation, The ice making unit (14) is provided with a plurality of ice making units (41) configured to collect uniced water that has not been frozen by the ice making water tank (24) supplied to the ice making unit (14). 26, 26) in an automatic ice making machine equipped with a control means (48) for determining that ice making is completed when it is detected that the ice making water in the ice making water tank (24) has reached the ice making completion water level,
When the detection means (26) in any one of the ice making units (41) first detects the ice making completion water level, when the preset first abnormality occurrence time elapses, in any of the other ice making units (41) An abnormality detection method for an automatic ice making machine, wherein the control means (48) determines that an abnormality has occurred when the detection means (26) has not detected the ice making completion water level. 製氷運転の開始から予め設定された第２異常発生時間が経過するまでに、全ての製氷ユニット(41)における検知手段(26)が製氷完了水位を検知した場合に、前記制御手段(48)は異常が発生したと判定する請求項１記載の自動製氷機の異常検知方法。   When the detection means (26) in all ice making units (41) detects the ice making completion water level from the start of the ice making operation until the preset second abnormality occurrence time elapses, the control means (48) The abnormality detection method for an automatic ice making machine according to claim 1, wherein it is determined that an abnormality has occurred.
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