JP2017161118A - Vacuum cooling equipment - Google Patents

Vacuum cooling equipment Download PDF

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JP2017161118A
JP2017161118A JP2016044244A JP2016044244A JP2017161118A JP 2017161118 A JP2017161118 A JP 2017161118A JP 2016044244 A JP2016044244 A JP 2016044244A JP 2016044244 A JP2016044244 A JP 2016044244A JP 2017161118 A JP2017161118 A JP 2017161118A
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cooling
temperature
control unit
pressure
pressure value
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JP6601275B2 (en
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脩平 石田
Shuhei Ishida
脩平 石田
久美 松矢
Hisami Matsuya
久美 松矢
泰三 松川
Taizo Matsukawa
泰三 松川
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Miura Co Ltd
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Miura Co Ltd
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Priority to JP2016044244A priority Critical patent/JP6601275B2/en
Priority to PCT/JP2017/001497 priority patent/WO2017154357A1/en
Priority to KR1020187020322A priority patent/KR102544881B1/en
Priority to CN201780010514.7A priority patent/CN108603710B/en
Priority to TW106106127A priority patent/TW201734392A/en
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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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/042—Air treating means within refrigerated spaces
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D7/00—Devices using evaporation effects without recovery of the vapour
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/04—Treating air flowing to refrigeration compartments
    • F25D2317/043—Treating air flowing to refrigeration compartments by creating a vacuum in a storage compartment
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/12—Sensors measuring the inside temperature

Abstract

PROBLEM TO BE SOLVED: To provide vacuum cooling equipment to cause a food material temperature to reach to a target temperature.SOLUTION: This invention relates to vacuum cooling equipment 1 comprising: a first cooling control part 501 for keeping an inner pressure at a cooling tank 2 at a first target pressure value for a first hour after the inner pressure in the cooling tank 2 is reduced to the first target pressure value by pressure reducing means 3 and reached to the first target pressure value; a food temperature judgement part 502 for judging whether or not the detected temperature of a food temperature sensor 21 reaches to the target temperature after cooling by the first cooling control part 501; and a second cooling control part 503 including a second cooling holding control part 5033 for newly setting a temperature in which a first temperature is subtracted from the set temperature, reducing pressure to a set pressure value newly set by the pressure reducing means 3 and keeping the inner pressure in the cooling tank 2 at a set pressure value for a second hour after the inner pressure in the cooling tank 2 reaches to the set pressure value when it is judged by the food temperature judgement part 502 that it does not reach to the target temperature.SELECTED DRAWING: Figure 1

Description

本発明は、食材や食品等を冷却するための真空冷却装置に関する。   The present invention relates to a vacuum cooling device for cooling food materials, foods, and the like.

特許文献１に開示されるように、被冷却物が収容された処理槽内を減圧して、被冷却物中の水分を気化し、その気化熱で被冷却物を冷却する真空冷却装置が知られている。このような真空冷却装置では、被冷却物に品温センサを付けて、この品温センサによる被冷却物の温度に基づいて、目標温度帯まで真空冷却することが行われている。
特許文献２には、異なる食材を同時に冷却する場合でも、冷却後温度の差を軽減して安定した冷却が可能な真空冷却装置及び真空冷却方法が開示されている。具体的には、食材の過冷却を防止する過冷却防止装置を備えることで、真空冷却時に処理槽内の圧力を予め設定された設定圧力まで減圧し、処理槽内の圧力が設定圧力に到達した後は、処理槽内をその設定圧力で維持する。そうすることで、冷却されやすい食材は、設定圧力に対応する飽和温度に近似する温度まで冷却され、当該飽和温度を下回ることがない。他方、冷却され難い食材は、処理槽内の飽和温度に近づくように時間をかけて冷却される。このように、処理槽内の圧力を減圧手段によって到達し得る圧力まで低下させないように、処理槽内の最大真空度を制御することで、被冷却物を冷却し過ぎることも、また、被冷却物の冷却不足もなくなり、異食材を安定して冷却するというものである。 As disclosed in Patent Document 1, there is known a vacuum cooling device that depressurizes the inside of a treatment tank in which an object to be cooled is stored, vaporizes moisture in the object to be cooled, and cools the object to be cooled with the heat of vaporization. It has been. In such a vacuum cooling device, a product temperature sensor is attached to an object to be cooled, and vacuum cooling is performed to a target temperature zone based on the temperature of the object to be cooled by the product temperature sensor.
Patent Document 2 discloses a vacuum cooling device and a vacuum cooling method capable of reducing the difference in temperature after cooling and performing stable cooling even when different foods are simultaneously cooled. Specifically, by providing a supercooling prevention device that prevents supercooling of foodstuffs, the pressure in the processing tank is reduced to a preset pressure during vacuum cooling, and the pressure in the processing tank reaches the set pressure. After that, the inside of the treatment tank is maintained at the set pressure. By doing so, the food that is easily cooled is cooled to a temperature that approximates the saturation temperature corresponding to the set pressure, and does not fall below the saturation temperature. On the other hand, the food that is difficult to cool is cooled over time so as to approach the saturation temperature in the treatment tank. In this way, it is possible to overcool the object to be cooled by controlling the maximum degree of vacuum in the treatment tank so that the pressure in the treatment tank is not reduced to a pressure that can be reached by the decompression means. There is no lack of cooling of the object, and the foreign food is stably cooled.

特開平９−２９６９７５号公報JP-A-9-296975 特開２００６−２６６６４９号公報JP 2006-266649 A

特許文献２に記載の過冷却防止機能を備える真空冷却装置を用いて、冷却され難い食材を目標温度まで冷却させる場合、例えば目標温度よりも少し低い温度を第１目標温度として設定して、処理槽内の圧力を第１目標温度に対応する飽和圧力値（第１目標圧力値）まで減圧し、処理槽内の圧力が第１目標圧力値に到達した後は、処理槽内の圧力をその第１目標圧力値で維持する。そうすることで、冷却され難い食材の温度が目標温度にまで低下することを待つことができる。
しかしながら、食材の種類によっては、途中で目標温度まで下がらず、品温が高止まりすることがある。 When using a vacuum cooling device having an overcooling prevention function described in Patent Literature 2 to cool a food that is difficult to cool to a target temperature, for example, a temperature slightly lower than the target temperature is set as the first target temperature, and processing is performed. After reducing the pressure in the tank to the saturation pressure value (first target pressure value) corresponding to the first target temperature and the pressure in the processing tank reaches the first target pressure value, the pressure in the processing tank is Maintain at the first target pressure value. By doing so, it can wait for the temperature of the foodstuff which is hard to be cooled to fall to the target temperature.
However, depending on the type of food, the product temperature may not be lowered to the target temperature and the product temperature may remain high.

本発明は、実際の食材温度を一定時間監視し、食材温度が下がらなくなった場合に、目標圧力を段階的に少しずつ下げていくことで目標温度に到達させることができる真空冷却装置を提供することを目的とする。   The present invention provides a vacuum cooling device that can monitor the actual food temperature for a certain period of time and reach the target temperature by gradually lowering the target pressure step by step when the food temperature does not decrease. For the purpose.

本発明は、被冷却物を収容する冷却槽と、前記被冷却物の温度を検出する品温センサと、前記冷却槽の内部空間を減圧する減圧手段と、制御部と、を備え、前記制御部は、前記減圧手段により、前記冷却槽の内部の圧力値を予め設定された目標温度に基づいて設定される第１目標圧力値まで減圧する第１減圧制御部と、前記冷却槽の内部の圧力値が前記第１目標圧力値に達した後、第１時間、前記冷却槽の内部の圧力値を前記第１目標圧力値に維持する第１冷却保持制御部と、を備える第１冷却制御部と、前記第１冷却制御部による冷却後、前記品温センサの検出温度が前記目標温度に到達したか否かを判定する品温判定部と、前記品温判定部により前記目標温度に到達していないと判定された場合に、設定温度として前記目標温度から予め設定された第１温度を減算した温度を設定するとともに、設定圧力値として前記設定温度の圧力換算値である圧力値を設定する第２冷却パラメータ設定部と、前記減圧手段により前記第２冷却パラメータ設定部により設定された設定圧力値まで減圧する第２減圧制御部と、前記冷却槽の内部の圧力値が前記設定圧力値に達した後、予め設定された第２時間、前記冷却槽の内部の圧力値を前記設定圧力値に維持する第２冷却保持制御部と、を備える第２冷却制御部と、を備える真空冷却装置に関する。   The present invention includes a cooling tank that accommodates an object to be cooled, a product temperature sensor that detects a temperature of the object to be cooled, a decompression unit that depressurizes an internal space of the cooling tank, and a control unit, and the control A first depressurization control unit that depressurizes the pressure value inside the cooling tank to a first target pressure value set based on a preset target temperature by the depressurization means; A first cooling control unit that maintains a pressure value inside the cooling tank at the first target pressure value for a first time after the pressure value reaches the first target pressure value. A product temperature determination unit that determines whether the temperature detected by the product temperature sensor has reached the target temperature after cooling by the first cooling control unit, and the target temperature is reached by the product temperature determination unit If it is determined that the target temperature is not A second cooling parameter setting unit that sets a temperature obtained by subtracting the determined first temperature and sets a pressure value that is a pressure-converted value of the set temperature as a set pressure value; and the second cooling parameter by the decompression unit. A second depressurization control unit configured to depressurize to a set pressure value set by the setting unit, and a second time set in advance after the pressure value inside the cooling bath reaches the set pressure value; And a second cooling control unit that maintains a second cooling control unit that maintains the pressure value at the set pressure value.

また、前記品温判定部は、前記第２冷却保持制御部による制御の終了時に前記品温センサの検出温度が前記目標温度に到達したか否かを判定し、前記第２冷却パラメータ設定部は、前記品温判定部により前記目標温度に到達していないと判定された場合に、前記設定温度を、更に前記第１温度を減算した値に置き換えるとともに、前記設定圧力値を置き換えた前記設定温度の圧力換算値である圧力値に置き換えることが好ましい。   The product temperature determination unit determines whether the temperature detected by the product temperature sensor has reached the target temperature at the end of the control by the second cooling hold control unit, and the second cooling parameter setting unit When the product temperature determination unit determines that the target temperature has not been reached, the set temperature is replaced with a value obtained by further subtracting the first temperature, and the set pressure value is replaced. It is preferable to replace it with a pressure value which is a pressure converted value.

また、前記制御部は、前記品温判定部により前記目標温度に到達したと判定された場合に、冷却を停止させることが好ましい。   Moreover, it is preferable that the said control part stops cooling, when it determines with the said product temperature determination part having reached | attained the said target temperature.

また、前記制御部は、前記第２冷却制御部による冷却後に、前記品温判定部により前記目標温度に到達していないと判定された場合であっても、前記冷却槽の内部の真空冷却運転を開始してから予め設定された最大冷却時間を経過した場合、冷却を停止させることが好ましい。   In addition, even when the control unit determines that the product temperature determination unit has not reached the target temperature after cooling by the second cooling control unit, a vacuum cooling operation inside the cooling tank is performed. It is preferable to stop the cooling when a preset maximum cooling time has elapsed since the start of.

また、前記第２冷却制御部による冷却後に、前記品温センサの検出温度を順番に記憶する記憶部を備え、前記制御部は、前記第２冷却制御部による冷却後に、前記品温センサの検出温度が前記記憶部に記憶された前回の前記品温センサの検出温度よりも高い場合、異常を警報し、運転を中断させることが好ましい。   A storage unit that sequentially stores the temperatures detected by the product temperature sensor after cooling by the second cooling control unit; and the control unit detects the product temperature sensor after cooling by the second cooling control unit. If the temperature is higher than the previous temperature detected by the product temperature sensor stored in the storage unit, it is preferable to warn of an abnormality and interrupt the operation.

また、前記制御部は、前記第２冷却制御部による冷却後に、前記品温センサの検出温度が前記記憶部に記憶された前回の前記品温センサの検出温度よりも低い場合であっても、検出温度差が所定の値以下の場合、冷却を停止させることが好ましい。   In addition, after the cooling by the second cooling control unit, the control unit, even if the detection temperature of the product temperature sensor is lower than the previous detection temperature of the product temperature sensor stored in the storage unit, When the detected temperature difference is not more than a predetermined value, it is preferable to stop the cooling.

また、前記第１目標圧力値は、前記目標温度から予め設定された冷却下限温度差を減算した温度の圧力換算値であることが好ましい。   The first target pressure value is preferably a pressure converted value of a temperature obtained by subtracting a preset cooling lower limit temperature difference from the target temperature.

また、前記第１温度は、前記第２冷却制御部が実行される順序番号毎に予め設定され、前記第２時間は、前記第２冷却保持制御部が実行される順序番号毎に予め設定されることが好ましい。   The first temperature is set in advance for each sequence number in which the second cooling control unit is executed, and the second time is set in advance for each sequence number in which the second cooling hold control unit is executed. It is preferable.

本発明によれば、食材の種類にかかわらず、食材温度を目標温度に到達させることができる。   According to the present invention, the food temperature can reach the target temperature regardless of the type of the food.

本実施形態に係る真空冷却装置を模式的に示す図である。It is a figure which shows typically the vacuum cooling device which concerns on this embodiment. 本実施形態に係る真空冷却装置の備える制御装置の機能的構成を示す機能ブロック図である。It is a functional block diagram which shows the functional structure of the control apparatus with which the vacuum cooling device which concerns on this embodiment is provided. 本実施形態に係る真空冷却装置の備える制御装置の冷却動作の一例を示した図である。It is the figure which showed an example of the cooling operation of the control apparatus with which the vacuum cooling device which concerns on this embodiment is provided.

以下、本発明の真空冷却装置の好ましい一実施形態について図面を参照しながら説明する。図１は、本発明に係る真空冷却装置の一実施形態を示す図である。   Hereinafter, a preferred embodiment of the vacuum cooling apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a vacuum cooling apparatus according to the present invention.

図１に示すように、真空冷却装置１は、冷却槽２と、減圧手段３と、復圧手段４と、制御装置５と、を備える。   As shown in FIG. 1, the vacuum cooling device 1 includes a cooling tank 2, a decompression unit 3, a decompression unit 4, and a control device 5.

冷却槽２は、被冷却物２３を収容する。冷却槽２は、被冷却物２３を出し入れするための開閉扉（図示せず）を備えており、この開閉扉を閉じることで冷却槽２は密閉可能となる。本実施例では、被冷却物２３として食材が冷却槽２内に収容される。   The cooling tank 2 accommodates an object 23 to be cooled. The cooling tank 2 includes an opening / closing door (not shown) for taking in and out the object 23 to be cooled, and the cooling tank 2 can be sealed by closing the opening / closing door. In the present embodiment, the food material is accommodated in the cooling tank 2 as the object 23 to be cooled.

冷却槽２には、冷却槽２内に収容される被冷却物である食材の温度を検出する品温センサ２１が備えられている。この品温センサ２１は、冷却槽２内に収容される食材に差し込まれる等して、その箇所の温度を計測する。   The cooling tank 2 is provided with a product temperature sensor 21 that detects the temperature of the food that is the object to be cooled contained in the cooling tank 2. This product temperature sensor 21 measures the temperature of the part by being inserted into the food accommodated in the cooling tank 2.

冷却槽２には、冷却槽２内の圧力を検出するための圧力センサ２２が備えられている。   The cooling tank 2 is provided with a pressure sensor 22 for detecting the pressure in the cooling tank 2.

減圧手段３は、真空ユニット３１を備え、この真空ユニット３１は減圧ライン３３を介して冷却槽２と接続される。
真空ユニット３１は、例えば、水封式真空ポンプを備えて構成される。
減圧ライン３３には、熱交換器３２を設けることが好ましい。また、減圧ライン３３の熱交換器３２の上流側に蒸気エゼクタ（図示せず）を設けてもよい。 The decompression means 3 includes a vacuum unit 31, and the vacuum unit 31 is connected to the cooling tank 2 through a decompression line 33.
The vacuum unit 31 includes a water ring vacuum pump, for example.
The decompression line 33 is preferably provided with a heat exchanger 32. A steam ejector (not shown) may be provided on the upstream side of the heat exchanger 32 in the decompression line 33.

熱交換器３２は、減圧ライン３３内の食材蒸気及び（蒸気エゼクタを設ける場合）蒸気エゼクタの蒸気を冷却し凝縮させるものである。減圧ライン３３内の食材蒸気及び蒸気エゼクタの蒸気を予め冷却し凝縮させておくことで、冷却槽２内の流体温度を低下させるとともに、排出される流体の体積を減少させる。そうすることで、真空ユニット３１の負荷を軽減して、冷却槽２内の減圧を有効に図ることができる。   The heat exchanger 32 cools and condenses the food vapor in the decompression line 33 and the vapor of the vapor ejector (when a vapor ejector is provided). The food vapor in the decompression line 33 and the vapor of the steam ejector are precooled and condensed, so that the fluid temperature in the cooling tank 2 is lowered and the volume of the fluid to be discharged is reduced. By doing so, the load of the vacuum unit 31 can be reduced and the pressure reduction in the cooling tank 2 can be effectively achieved.

蒸気エゼクタは、蒸気を噴出させることにより冷却槽２内の流体を吸引排出させる。蒸気エゼクタによって真空ユニット３１の吸引側の圧力を高めることができ、冷却槽２内の減圧を有効に図ることができる。   The steam ejector sucks and discharges the fluid in the cooling tank 2 by ejecting steam. The pressure on the suction side of the vacuum unit 31 can be increased by the steam ejector, and the pressure in the cooling tank 2 can be effectively reduced.

復圧手段４は、減圧された冷却槽２へ外気を導入して、真空状態を解除し復圧する手段である。具体的には、外気は、フィルター４１を介して取り込まれ、復圧ライン４２を介して冷却槽２内へ供給可能とされている。
復圧ライン４２には、外気と冷却槽２内との連通の有無を切り替える復圧操作弁４３が設けられる。従って、復圧操作弁４３を閉じた状態で、減圧手段３により冷却槽２内を減圧した後、減圧手段３による減圧を停止して、復圧操作弁４３を開放することで、冷却槽２内の真空状態を解除して大気圧下に戻すことができる。 The return pressure means 4 is means for introducing outside air into the decompressed cooling tank 2 to release the vacuum state and return the pressure. Specifically, the outside air is taken in through the filter 41 and can be supplied into the cooling tank 2 through the return pressure line 42.
The return pressure line 42 is provided with a return pressure operation valve 43 for switching the presence / absence of communication between the outside air and the inside of the cooling tank 2. Therefore, after the decompression means 3 is decompressed by the decompression means 3 with the decompression operation valve 43 closed, the decompression by the decompression means 3 is stopped, and the decompression operation valve 43 is opened, so that the cooling tank 2 The vacuum state inside can be released and returned to atmospheric pressure.

復圧操作弁４３は、比例制御弁のように、その開度が任意に調整可能に構成されている。従って、減圧手段３による冷却槽２内の減圧時に、復圧操作弁４３の開度を調整することで、冷却槽２内の圧力を任意に調整可能となる。
より具体的には、圧力センサ２２の出力に基づき、復圧操作弁４３の開度を調整しつつ、減圧手段３による減圧操作を行うことで、冷却槽２内の圧力調整を容易に行うことができる。 The return pressure operation valve 43 is configured such that its opening degree can be arbitrarily adjusted like a proportional control valve. Therefore, the pressure in the cooling tank 2 can be arbitrarily adjusted by adjusting the opening of the return pressure operation valve 43 when the pressure reducing means 3 depressurizes the cooling tank 2.
More specifically, it is possible to easily adjust the pressure in the cooling tank 2 by adjusting the opening degree of the return pressure operation valve 43 based on the output of the pressure sensor 22 and performing the pressure reducing operation by the pressure reducing means 3. Can do.

制御装置５は、減圧手段３や復圧手段４等を制御する。本実施例では、真空ユニット３１、復圧操作弁４３、品温センサ２１、及び圧力センサ２２は、制御装置５に接続され、制御装置５により各種制御が可能とされる。
具体的には、制御装置５は、圧力センサ２２からの検出信号に基づいて、復圧操作弁４３の開度を調整して、真空ユニット３１による冷却槽２内の減圧レベルを調整する。
制御装置５は、冷却槽２内の減圧時に、冷却槽２内の圧力を設定圧力で維持した状態で、減圧手段３及び復圧手段４を停止させることで、冷却後温度が安定した均一な真空冷却を行うことができる。
真空冷却処理終了時に、制御装置５は、復圧操作弁４３を開いて冷却槽２内を大気圧まで復圧する。そして、圧力センサ２２からの検出信号に基づいて、復圧操作弁４３による冷却槽２内の復圧完了を確認する。 The control device 5 controls the decompression means 3, the decompression means 4, and the like. In this embodiment, the vacuum unit 31, the return pressure operation valve 43, the product temperature sensor 21, and the pressure sensor 22 are connected to the control device 5, and various controls can be performed by the control device 5.
Specifically, the control device 5 adjusts the pressure reduction level in the cooling tank 2 by the vacuum unit 31 by adjusting the opening degree of the return pressure operation valve 43 based on the detection signal from the pressure sensor 22.
When the pressure in the cooling tank 2 is reduced, the control device 5 stops the pressure reducing means 3 and the pressure-reducing means 4 while maintaining the pressure in the cooling tank 2 at the set pressure, so that the temperature after cooling is uniform and stable. Vacuum cooling can be performed.
At the end of the vacuum cooling process, the control device 5 opens the return pressure operation valve 43 to return the pressure in the cooling tank 2 to atmospheric pressure. Based on the detection signal from the pressure sensor 22, the completion of the return pressure in the cooling tank 2 by the return pressure operation valve 43 is confirmed.

図２は、制御装置５の機能的構成を示す機能ブロック図である。図２に示すように、制御装置５は、制御部５０と、記憶部５１と、を備える。   FIG. 2 is a functional block diagram showing a functional configuration of the control device 5. As shown in FIG. 2, the control device 5 includes a control unit 50 and a storage unit 51.

制御部５０は、品温センサ２１、圧力センサ２２、真空ユニット３１、復圧操作弁４３等を接続して、食材の冷却に関する制御を行う。
ここで、本実施形態では、制御部５０を、冷却槽の内部を第１目標圧力値まで減圧する第１冷却制御部と、この第１冷却制御部により品温が目標温度まで低下しなかった場合に、冷却槽の内部を第１目標圧力値よりも低く設定される設定圧力値まで減圧する第２冷却制御部と、を含んで構成することで、食材の種類にかかわらず、食材温度を好適に目標温度に到達させることを可能としている。 The control unit 50 connects the product temperature sensor 21, the pressure sensor 22, the vacuum unit 31, the return pressure operation valve 43, and the like, and performs control related to cooling of the food material.
Here, in the present embodiment, the controller 50 has the first cooling controller that depressurizes the inside of the cooling tank to the first target pressure value, and the product temperature is not lowered to the target temperature by the first cooling controller. In this case, by including a second cooling control unit that depressurizes the inside of the cooling tank to a set pressure value that is set lower than the first target pressure value, the food temperature can be set regardless of the type of food. It is possible to suitably reach the target temperature.

より具体的には、図２に示すように、制御部５０は、第１減圧制御部５０１１及び第１冷却保持制御部５０１２を備える第１冷却制御部５０１と、品温判定部５０２と、第２冷却パラメータ設定部５０３１、第２減圧制御部５０３２、及び第２冷却保持制御部５０３３を備える第２冷却制御部５０３と、冷却中断部５０４と、冷却停止部５０５と、を備える。   More specifically, as shown in FIG. 2, the control unit 50 includes a first cooling control unit 501 including a first pressure reduction control unit 5011 and a first cooling hold control unit 5012, a product temperature determination unit 502, A second cooling control unit 503 including a second cooling parameter setting unit 5031, a second decompression control unit 5032, and a second cooling hold control unit 5033, a cooling interruption unit 504, and a cooling stop unit 505;

第１冷却制御部５０１は、第１減圧制御部５０１１により冷却槽２の内部の圧力値を予め設定された目標温度に基づいて設定される第１目標圧力値まで減圧した後、第１冷却保持制御部５０１２により、予め冷却保持時間として設定された第１時間、冷却槽２の内部の圧力値を第１目標圧力値に維持する。   The first cooling control unit 501 reduces the pressure value inside the cooling tank 2 to the first target pressure value set based on a preset target temperature by the first pressure reduction control unit 5011 and then holds the first cooling. The controller 5012 maintains the pressure value inside the cooling tank 2 at the first target pressure value for a first time set in advance as a cooling holding time.

具体的には、第１減圧制御部５０１１は、目標温度から予め設定された冷却下限温度差を除算した第１目標温度に対応する飽和圧力値を第１目標圧力値として、減圧手段３により、冷却槽２の内部の圧力を第１目標圧力値まで減圧する。
冷却下限温度差としては、減圧冷却において被冷却物２３の過冷却など不適切な冷却現象を起こさない減圧幅に相当する温度差が設定されることが好ましい。なお、最適な冷却下限温度差は被冷却物２３によって異なり、一般的には３度以下とすることが好ましい。 Specifically, the first pressure reduction control unit 5011 uses the pressure reduction means 3 as a first target pressure value that is a saturation pressure value corresponding to a first target temperature obtained by dividing a preset cooling lower limit temperature difference from the target temperature. The pressure inside the cooling tank 2 is reduced to the first target pressure value.
As the cooling lower limit temperature difference, it is preferable to set a temperature difference corresponding to a reduced pressure width that does not cause an inappropriate cooling phenomenon such as overcooling of the object 23 in reduced pressure cooling. The optimum cooling lower limit temperature difference varies depending on the object 23 to be cooled, and is generally preferably 3 degrees or less.

第１冷却保持制御部５０１２は、冷却槽２の内部の圧力が第１目標圧力値に達した後、第１時間（例えば１５分）、冷却槽２の内部の圧力値を第１目標圧力値に維持する。
より具体的には、第１冷却保持制御部５０１２は、圧力センサ２２の出力に基づき、復圧操作弁４３の開度を調整しつつ、減圧手段３による減圧操作を行うことで、冷却槽２の内部の圧力を第１時間、第１目標圧力値に維持する。 The first cooling and holding control unit 5012 sets the pressure value inside the cooling tank 2 to the first target pressure value for a first time (for example, 15 minutes) after the pressure inside the cooling tank 2 reaches the first target pressure value. To maintain.
More specifically, the first cooling hold control unit 5012 adjusts the opening degree of the return pressure operation valve 43 based on the output of the pressure sensor 22 and performs the pressure reducing operation by the pressure reducing means 3, so that the cooling tank 2. Is maintained at a first target pressure value for a first time.

品温判定部５０２は、第１冷却制御部５０１による冷却後、品温センサ２１の検出温度（被冷却物２３の温度）が目標温度に到達したか否かを判定する。
また、品温判定部５０２は、第２冷却保持制御部５０３３による制御の終了時に品温センサ２１の検出温度（被冷却物２３の温度）が目標温度に到達したか否かを判定する。 The product temperature determination unit 502 determines whether or not the temperature detected by the product temperature sensor 21 (the temperature of the object 23 to be cooled) has reached the target temperature after being cooled by the first cooling control unit 501.
Further, the product temperature determination unit 502 determines whether or not the temperature detected by the product temperature sensor 21 (the temperature of the object 23 to be cooled) has reached the target temperature at the end of the control by the second cooling hold control unit 5033.

第２冷却制御部５０３は、第１冷却制御部５０１による冷却後、及び第２冷却制御部５０３による冷却後に、品温センサ２１の検出温度が目標温度に到達していないと判定された場合に、さらに設定圧力値を下げて、所定時間真空冷却を行う。   When the second cooling control unit 503 determines that the temperature detected by the product temperature sensor 21 has not reached the target temperature after cooling by the first cooling control unit 501 and after cooling by the second cooling control unit 503. Further, the set pressure value is further lowered and vacuum cooling is performed for a predetermined time.

ここで、第１冷却制御部５０１による冷却直後の第２冷却制御部５０３による冷却を第１番目の第２冷却、第１番目の第２冷却の次に行う第２冷却制御部５０３による冷却を第２番目の第２冷却、第ｎ番目の第２冷却の次に行う第２冷却制御部５０３による冷却を第（ｎ＋１）番目の第２冷却という。このように、今回の第２冷却保持制御部５０３３による冷却が、最初に第２冷却制御部５０３による冷却を開始してから何番目になるかを識別する番号を第２冷却順序番号という。以下、第ｎ番目の第２冷却を第２冷却（ｎ）ともいう。   Here, the cooling by the second cooling control unit 503 immediately after the cooling by the first cooling control unit 501 is performed by the second cooling control unit 503 which performs the cooling after the first second cooling and the first second cooling. Cooling by the second cooling control unit 503 performed after the second second cooling and the nth second cooling is referred to as an (n + 1) th second cooling. As described above, the number for identifying the order of the cooling by the second cooling holding control unit 5033 from the start of the cooling by the second cooling control unit 503 is referred to as a second cooling sequence number. Hereinafter, the n-th second cooling is also referred to as second cooling (n).

このように、第２冷却制御部５０３は、第１冷却制御部５０１又は第２冷却制御部５０３による冷却後に依然として品温センサ２１の検出温度が目標温度に到達していないと判定される場合に、第２冷却パラメータ設定部５０３１により、設定圧力値を低く設定して、第２減圧制御部５０３２により冷却槽２の内部の圧力値を前記設定圧力値まで減圧した後、第２冷却保持制御部５０３３により第２時間、冷却槽２の内部の圧力値を前記設定圧力値に維持することを行う。第２冷却制御部５０３は、品温センサ２１の検出温度が目標温度に到達するまで、前述の処理を繰り返し（リカーシブに）行う。そうすることで、食材の種類に関わらず、食材温度を目標温度に到達させることができる。   As described above, when the second cooling control unit 503 determines that the temperature detected by the product temperature sensor 21 has not yet reached the target temperature after cooling by the first cooling control unit 501 or the second cooling control unit 503. The second cooling parameter setting unit 5031 sets the set pressure value low, and the second pressure reduction control unit 5032 reduces the pressure value inside the cooling tank 2 to the set pressure value, and then the second cooling hold control unit. By 5033, the pressure value inside the cooling tank 2 is maintained at the set pressure value for the second time. The second cooling control unit 503 repeats (recursively) the above-described processing until the temperature detected by the product temperature sensor 21 reaches the target temperature. By doing so, irrespective of the kind of foodstuff, foodstuff temperature can be made to reach target temperature.

より具体的には、第２冷却パラメータ設定部５０３１、第２減圧制御部５０３２、及び第２冷却保持制御部５０３３は、それぞれ次のように処理する。   More specifically, the second cooling parameter setting unit 5031, the second decompression control unit 5032, and the second cooling hold control unit 5033 each process as follows.

第２冷却パラメータ設定部５０３１は、第１冷却保持制御部５０１２による制御の終了時に、品温センサ２１の検出温度が品温判定部５０２により目標温度に到達していないと判定された場合に、目標温度から予め設定された第１温度（例えば１度）を減算した温度を設定温度として記憶部５１に記憶する。同時に、第２冷却パラメータ設定部５０３１は、設定温度の圧力換算値である圧力値を設定圧力値として記憶部５１に記憶する。
更に、第２冷却パラメータ設定部５０３１は、第２冷却保持制御部５０３３による冷却終了時に、品温センサ２１の検出温度が品温判定部５０２により目標温度に到達していないと判定された場合に、前回設定された設定温度から第１温度を減算した値を設定温度として記憶部５１に新たに記憶する。同時に、第２冷却パラメータ設定部５０３１は、新たに設定された設定温度の圧力換算値である圧力値を設定圧力値として記憶部５１に記憶する。 When the second cooling parameter setting unit 5031 determines that the temperature detected by the product temperature sensor 21 has not reached the target temperature by the product temperature determination unit 502 at the end of the control by the first cooling hold control unit 5012, A temperature obtained by subtracting a preset first temperature (for example, 1 degree) from the target temperature is stored in the storage unit 51 as a set temperature. At the same time, the second cooling parameter setting unit 5031 stores a pressure value, which is a pressure converted value of the set temperature, in the storage unit 51 as a set pressure value.
Further, the second cooling parameter setting unit 5031, when the temperature detected by the product temperature sensor 21 is determined not to reach the target temperature by the product temperature determination unit 502 at the end of cooling by the second cooling hold control unit 5033. A value obtained by subtracting the first temperature from the previously set temperature is newly stored in the storage unit 51 as the set temperature. At the same time, the second cooling parameter setting unit 5031 stores a pressure value, which is a pressure converted value of the newly set temperature, in the storage unit 51 as a set pressure value.

ここで、第１温度を例えば５度のような大きな値にすると、過冷却防止機能と異なる冷却制御になることが起こり得るため、第１温度は、前述した冷却下限温度差以下の値とすることが好ましい。   Here, if the first temperature is set to a large value such as 5 degrees, for example, cooling control different from the overcooling prevention function may occur. Therefore, the first temperature is set to a value equal to or less than the above-described cooling lower limit temperature difference. It is preferable.

なお、今回の第２冷却パラメータ設定部５０３１の処理が第ｎ（ｎ≧１）番目の第２冷却制御部５０３に相当する場合、第ｎ番目の第２冷却パラメータ設定処理という。そして、第ｎ番目の第２冷却パラメータ設定処理によって設定される第ｎ番目の設定温度及び第ｎ番目の設定圧力値を、簡単のためそれぞれ設定温度（ｎ）及び設定圧力値（ｎ）と記載する。   In addition, when the process of this 2nd cooling parameter setting part 5031 corresponds to the nth (n> = 1) 2nd cooling control part 503, it is called the nth 2nd cooling parameter setting process. For the sake of simplicity, the nth set temperature and the nth set pressure value set by the nth second cooling parameter setting process are described as a set temperature (n) and a set pressure value (n), respectively. To do.

第２減圧制御部５０３２は、記憶部５１に設定された設定圧力値まで、減圧手段３により減圧する。今回の第２減圧制御部５０３２の処理が第ｎ番目の第２冷却制御部５０３に相当する場合、第ｎ番目の第２減圧制御部処理という。   The second decompression control unit 5032 decompresses the decompression means 3 to the set pressure value set in the storage unit 51. When the processing of the second pressure reduction control unit 5032 this time corresponds to the nth second cooling control unit 503, it is referred to as the nth second pressure reduction control unit processing.

第２冷却保持制御部５０３３は、第２減圧制御部５０３２による減圧制御により、冷却槽２の内部の圧力が記憶部５１に設定された設定圧力値に達した後、予め冷却保持時間として設定された第２時間（例えば２分）、冷却槽２の内部の圧力を当該設定圧力値に維持する。今回の第２冷却保持制御部５０３３の処理が第ｎ番目の第２冷却制御部５０３に相当する場合、第ｎ番目の第２冷却保持制御部処理という。   The second cooling hold control unit 5033 is set in advance as a cooling hold time after the pressure inside the cooling tank 2 reaches the set pressure value set in the storage unit 51 by the pressure reduction control by the second pressure reduction control unit 5032. During the second time (for example, 2 minutes), the pressure inside the cooling tank 2 is maintained at the set pressure value. When the processing of the second cooling and holding control unit 5033 this time corresponds to the nth second cooling and controlling unit 503, it is referred to as nth second cooling and holding control unit processing.

第２冷却保持制御部５０３３はその制御終了後に、品温センサ２１の検出温度を、今回の第２冷却制御部５０３による冷却を識別する第２冷却順序番号ｎ（ｎ≧１）にリンクさせて、記憶部５１に記憶させる。第ｎ番目の第２冷却保持制御部処理の終了後における品温センサ２１の検出温度を第ｎ番目の検出といい、簡単のため、検出温度（ｎ）と記載する。   After the end of the control, the second cooling holding control unit 5033 links the temperature detected by the product temperature sensor 21 to the second cooling sequence number n (n ≧ 1) for identifying the cooling by the second cooling control unit 503 at this time. And stored in the storage unit 51. The detected temperature of the product temperature sensor 21 after the end of the nth second cooling and holding control unit process is referred to as the nth detection, and is described as a detected temperature (n) for simplicity.

なお、第１温度は、一律の値ではなく、第２冷却制御部５０３が実行される順序番号ｎ毎に予め設定し、第２時間についても、第２冷却保持制御部５０３３が実行される順序番号ｎ毎に予め設定するようにしてもよい。そうすることで、例えば、第１温度及び第２時間は例えばｎが大きくなるにつれて、徐々に小さくして収束させるように構成することができる。   The first temperature is not a uniform value, but is set in advance for each sequence number n in which the second cooling control unit 503 is executed, and the order in which the second cooling holding control unit 5033 is executed for the second time. You may make it preset for every number n. By doing so, for example, the first temperature and the second time can be configured to gradually decrease and converge as n increases, for example.

冷却中断部５０４は、第２冷却制御部５０３による冷却後に、品温センサ２１の検出温度が記憶部５１に記憶された前回の品温センサ２１の検出温度よりも高い場合、異常を警報し、運転を中断させる。
すなわち、冷却中断部５０４は、今回（第ｎ番目）の第２冷却制御部５０３による冷却後における品温センサ２１の検出温度（ｎ）が、前回（第ｎ−１番目）の第２冷却制御部５０３による冷却後における品温センサ２１の検出温度（ｎ−１）よりも高い場合には、冷却異常が発生したと判断して、異常を警報し、運転を中断させる。 The cooling interruption unit 504 warns an abnormality when the temperature detected by the product temperature sensor 21 is higher than the previous temperature detected by the product temperature sensor 21 stored in the storage unit 51 after cooling by the second cooling control unit 503. Stop driving.
In other words, the cooling interruption unit 504 detects the temperature (n) detected by the product temperature sensor 21 after cooling by the current (n-th) second cooling control unit 503 as the second (n-1) th second cooling control. When the temperature is higher than the detected temperature (n-1) of the product temperature sensor 21 after cooling by the unit 503, it is determined that a cooling abnormality has occurred, the abnormality is alarmed, and the operation is interrupted.

冷却停止部５０５は、第２冷却制御部５０３による冷却後に、品温判定部５０２により目標温度に到達していないと判定された場合であっても、冷却槽２内の真空冷却運転を開始してから予め設定された最大冷却時間を経過した場合、冷却を停止させる。
具体的には、冷却槽２内の真空冷却運転を開始してから最大冷却時間を経過した場合、冷却停止部５０５は、復圧操作弁４３を開いて冷却槽２内を大気圧まで復圧する。そして、圧力センサ２２からの検出信号に基づいて、復圧操作弁４３による冷却槽２内の復圧完了を確認する。 The cooling stop unit 505 starts the vacuum cooling operation in the cooling tank 2 even when the product temperature determination unit 502 determines that the target temperature has not been reached after cooling by the second cooling control unit 503. If the preset maximum cooling time has elapsed, the cooling is stopped.
Specifically, when the maximum cooling time has elapsed since the start of the vacuum cooling operation in the cooling tank 2, the cooling stop unit 505 opens the return pressure operation valve 43 to return the pressure in the cooling tank 2 to atmospheric pressure. . Based on the detection signal from the pressure sensor 22, the completion of the return pressure in the cooling tank 2 by the return pressure operation valve 43 is confirmed.

また、冷却停止部５０５は、今回（第ｎ番目）の第２冷却制御部５０３による冷却後に、品温センサ２１の検出温度（ｎ）が記憶部５１に記憶された前回（第ｎ−１番目）の品温センサ２１の検出温度（ｎ−１）よりも低い場合であっても、検出温度差が所定の値以下の場合、冷却を停止させる。
そうすることで、冷却停止部５０５は、これ以上第２冷却制御部５０３による処理を繰り返しても、冷却効果が少ないと想定される場合、冷却を停止させることで、無駄を防ぐことができる。
以上のように、制御部５０は構成される。 In addition, the cooling stop unit 505 performs the previous (n−1) th time when the detected temperature (n) of the product temperature sensor 21 is stored in the storage unit 51 after the cooling by the second (nth) second cooling control unit 503. Even if the temperature is lower than the detected temperature (n-1) of the product temperature sensor 21, the cooling is stopped if the detected temperature difference is equal to or smaller than a predetermined value.
By doing so, the cooling stop unit 505 can prevent waste by stopping the cooling when it is assumed that the cooling effect is small even if the processing by the second cooling control unit 503 is repeated.
As described above, the control unit 50 is configured.

記憶部５１には、上述の冷却下限温度差、第１時間、第１温度、第２時間、最大冷却時間、第１目標温度、第１目標圧力値等が記憶される。
また、記憶部５１には、上述の第ｎ番目（ｎ≧１）の第２冷却パラメータ設定処理により設定される設定温度（ｎ）及び設定圧力値（ｎ）が記憶される。
また、記憶部５１には、上述の第ｎ番目（ｎ≧１）の第２冷却制御部５０３による冷却処理後に検出される検出温度（ｎ）が記憶される。 The storage unit 51 stores the above-described cooling lower limit temperature difference, first time, first temperature, second time, maximum cooling time, first target temperature, first target pressure value, and the like.
Further, the storage unit 51 stores the set temperature (n) and the set pressure value (n) set by the above-described nth (n ≧ 1) second cooling parameter setting process.
Further, the storage unit 51 stores a detected temperature (n) detected after the cooling process by the n-th (n ≧ 1) second cooling control unit 503 described above.

［動作説明］
次に図３を参照して、本実施形態の冷却動作について説明する。図３は、本実施形態の真空冷却装置１の冷却動作の一例を示した図である。横軸は時間ｔ、縦軸（左側）は圧力Ｐ、縦軸（右側）は温度Ｔを表すものとする。ここで、温度Ｔは圧力Ｐに対応する飽和温度であり、逆に圧力Ｐは温度Ｔに対応する飽和圧力を意味する。 [Description of operation]
Next, the cooling operation of the present embodiment will be described with reference to FIG. FIG. 3 is a diagram illustrating an example of the cooling operation of the vacuum cooling device 1 of the present embodiment. The horizontal axis represents time t, the vertical axis (left side) represents pressure P, and the vertical axis (right side) represents temperature T. Here, the temperature T is a saturation temperature corresponding to the pressure P, and conversely, the pressure P means a saturation pressure corresponding to the temperature T.

図３において、真空冷却装置１の冷却パラメータは、目標温度を１７度、目標温度に対応する飽和圧力値１９ｈＰａ、冷却下限温度差を２度、第１目標温度を１５度（１７度マイナス２度）、第１目標温度に対応する第１目標圧力値１７ｈＰａ、第１冷却保持制御部５０１２における冷却保持時間（第１時間）を１５分、第１温度を１度、第２冷却保持制御部５０３３における冷却保持時間（第２時間）を２分、最大冷却時間を４０分として設定されている。
また、冷却前の被冷却物２３の温度を１００度（飽和圧力換算値１０１３ｈＰａ）とし、目標温度１７度まで冷却するものとする。 In FIG. 3, the cooling parameters of the vacuum cooling device 1 are as follows: the target temperature is 17 degrees, the saturation pressure value corresponding to the target temperature is 19 hPa, the cooling lower limit temperature difference is 2 degrees, and the first target temperature is 15 degrees (17 degrees minus 2 degrees). ), The first target pressure value 17 hPa corresponding to the first target temperature, the cooling holding time (first time) in the first cooling holding control unit 5012 is 15 minutes, the first temperature is 1 degree, and the second cooling holding control unit 5033 The cooling holding time (second time) is set to 2 minutes and the maximum cooling time is set to 40 minutes.
Moreover, the temperature of the to-be-cooled object 23 before cooling shall be 100 degree | times (saturation pressure conversion value 1013 hPa), and shall be cooled to the target temperature of 17 degree | times.

まず、冷却槽２内に被冷却物２３である食材を収容し、食材に品温センサ２１を差込む。そして、冷却槽２の作業用の開閉扉を閉鎖する。このとき制御部は復圧操作弁４３を閉鎖状態にするとともに真空ユニット３１を停止させている。   First, the foodstuff which is the to-be-cooled object 23 is accommodated in the cooling tank 2, and the product temperature sensor 21 is inserted in a foodstuff. Then, the work opening / closing door of the cooling tank 2 is closed. At this time, the control unit closes the return pressure operation valve 43 and stops the vacuum unit 31.

次に時間ｔ０において、第１減圧制御部５０１１は、真空ユニット３１を作動させる。真空ユニット３１の作動により、冷却槽２内の空気は減圧ライン３３を介して真空吸引される。冷却槽２内の圧力が低下するにつれて飽和温度が低下するため、冷却槽２内の食材の水分が活発に蒸発し、この蒸気は空気とともに減圧ライン３３によって吸引される。そして食材の中の水分の蒸発に伴う気化潜熱により食材が冷却される。 Next, at time t 0 , the first pressure reduction control unit 5011 operates the vacuum unit 31. By the operation of the vacuum unit 31, the air in the cooling bath 2 is vacuumed through the pressure reducing line 33. Since the saturation temperature decreases as the pressure in the cooling tank 2 decreases, the moisture in the food in the cooling tank 2 actively evaporates, and this vapor is sucked together with the air by the decompression line 33. And the foodstuff is cooled by the vaporization latent heat accompanying the evaporation of the water | moisture content in a foodstuff.

時間ｔ１において、冷却槽２内の圧力が第１目標圧力値１７ｈＰａ（飽和温度１５度に対応）に到達すると、第１冷却保持制御部５０１２は、第１時間（１５分）が経過する時間ｔ２までの間、復圧制御弁の開度を調整しつつ、真空ユニット３１を作動させることにより、冷却槽２内の圧力を、１７ｈＰａ（飽和温度１５度に対応）に維持する。 When the pressure in the cooling tank 2 reaches the first target pressure value 17 hPa (corresponding to the saturation temperature of 15 degrees) at time t 1 , the first cooling holding control unit 5012 is the time for which the first time (15 minutes) elapses. until t 2, while adjusting the opening degree of the recovery control valve, by actuating the vacuum unit 31, to maintain the pressure in the cooling tank 2, the 17HPa (corresponding to the saturation temperature of 15 degrees).

他方、品温センサ２１の検出温度は、時間ｔ１において２５度超を示しており、目標温度１７度に到達していない。そして、第１時間（１５分）経過後の時間ｔ２において２５度を示しており、目標温度１７度に到達していないことがわかる。 On the other hand, the detected temperature of the product temperature sensor 21, at time t 1 shows a 25 ° greater, has not reached the target temperature 17 °. The first hour (15 minutes) shows 25 degrees at the time t 2 after elapse, it can be seen that does not reach the target temperature 17 °.

そこで、第２冷却パラメータ設定部５０３１は、設定温度（１）を第１目標温度１５度から第１温度（１度）を減算した温度１４度に設定し、設定圧力（１）を設定温度（１）の１４度に対応する飽和圧力１６ｈＰａに設定する。
第２減圧制御部５０３２により時間ｔ３において、冷却槽２内圧力を設定圧力（１）まで下げた後、第２冷却保持制御部５０３３は、それから第２時間（２分）が経過する時間ｔ４までの間、復圧制御弁の開度を調整しつつ、真空ユニット３１を作動させることにより、冷却槽２内の圧力を、１６ｈＰａ（飽和温度１４度に対応）に維持する。 Therefore, the second cooling parameter setting unit 5031 sets the set temperature (1) to 14 degrees, which is obtained by subtracting the first temperature (1 degree) from the first target temperature 15 degrees, and sets the set pressure (1) to the set temperature (1). The saturation pressure is set to 16 hPa corresponding to 14 degrees of 1).
At time t 3 the second pressure reduction control unit 5032, after reducing the pressure in the cooling tank 2 until the set pressure (1), the second cooling holding control unit 5033, then the time the second time (2 minutes) elapses t Up to 4 , the pressure in the cooling tank 2 is maintained at 16 hPa (corresponding to a saturation temperature of 14 degrees) by operating the vacuum unit 31 while adjusting the opening of the return pressure control valve.

他方、品温センサ２１の検出温度は、時間ｔ４において２０度を示しており、目標温度１７度に到達していないことがわかる。 On the other hand, the detected temperature of the product temperature sensor 21 indicates a 20 ° at time t 4, it can be seen that does not reach the target temperature 17 °.

そこで、第２冷却パラメータ設定部５０３１は、設定温度（２）を、設定温度（１）の１４度から第１温度（１度）を減算した温度１３度に設定し、設定圧力（２）を設定温度（２）の１３度に対応する飽和圧力１５ｈＰａに設定する。
第２減圧制御部５０３２により時間ｔ５において、冷却槽２内圧力を設定圧力（２）まで下げた後、第２冷却保持制御部５０３３は、それから第２時間（２分）が経過する時間ｔ６までの間、復圧制御弁の開度を調整しつつ、真空ユニット３１を作動させることにより、冷却槽２内の圧力を、１５ｈＰａ（飽和温度１３度に対応）に維持する。 Therefore, the second cooling parameter setting unit 5031 sets the set temperature (2) to a temperature of 13 degrees obtained by subtracting the first temperature (1 degree) from the set temperature (1) of 14 degrees, and sets the set pressure (2). The saturation pressure is set to 15 hPa corresponding to the set temperature (2) of 13 degrees.
At time t 5 by the second pressure reduction control unit 5032, after reducing the pressure in the cooling tank 2 until the set pressure (2), the second cooling holding control unit 5033, then the time the second time (2 minutes) elapses t 6 until the pressure in the cooling tank 2 is maintained at 15 hPa (corresponding to a saturation temperature of 13 degrees) by operating the vacuum unit 31 while adjusting the opening of the return pressure control valve.

他方、品温センサ２１の検出温度は、時間ｔ６において１７度を示しており、目標温度１７度に到達したことがわかる。
冷却停止部５０５は、冷却を停止させる。具体的には、冷却停止部５０５は、真空ユニット３１を停止させるとともに復圧操作弁４３を開放させる。
このように、食材が目標温度まで到達していない場合には、目標圧力を少しずつ下げていくことで目標温度に近づけることが可能となる。 On the other hand, the detected temperature of the product temperature sensor 21 indicates the 17 degrees at the time t 6, it can be seen that reaches the target temperature 17 °.
The cooling stop unit 505 stops cooling. Specifically, the cooling stop unit 505 stops the vacuum unit 31 and opens the return pressure operation valve 43.
Thus, when the food has not reached the target temperature, it is possible to bring the target temperature closer to the target temperature by gradually decreasing the target pressure.

［効果説明］
以上のように、本実施形態の真空冷却装置１は、冷却槽２の内部圧力を第１目標圧力値まで減圧し、冷却槽２の内部圧力が第１目標圧力値に達した後、第１時間（例えば１５分間）、冷却槽２の内部圧力を第１目標圧力値に維持する第１冷却制御部５０１と、第１冷却制御部５０１による冷却後、品温センサ２１の検出温度が目標温度に到達していない場合に、第１温度（例えば１度）を減算した温度の圧力換算値を新たに設定圧力値として設定して、当該設定圧力値まで減圧し、冷却槽２の内部圧力が新たな設定圧力値に達した後、第２時間（例えば２分間）、冷却槽２の内部圧力を新たな設定圧力値に維持する第２冷却制御部５０３と、を備える。
これにより、冷却され難い食材が第１冷却制御部５０１の処理により途中で目標温度まで下がらずに品温が高止まりする場合であっても、第２冷却制御部５０３により目標圧力を下げて再度冷却させることで、目標温度まで近づけることが可能となる。 [Explanation of effects]
As described above, the vacuum cooling device 1 of the present embodiment reduces the internal pressure of the cooling tank 2 to the first target pressure value, and after the internal pressure of the cooling tank 2 reaches the first target pressure value, the first For the time (for example, 15 minutes), after cooling by the first cooling control unit 501 that maintains the internal pressure of the cooling tank 2 at the first target pressure value and the cooling by the first cooling control unit 501, the temperature detected by the product temperature sensor 21 is the target temperature. Is not reached, the pressure converted value of the temperature obtained by subtracting the first temperature (for example, 1 degree) is newly set as the set pressure value, the pressure is reduced to the set pressure value, and the internal pressure of the cooling tank 2 is A second cooling control unit 503 that maintains the internal pressure of the cooling bath 2 at the new set pressure value for a second time (for example, 2 minutes) after reaching the new set pressure value.
As a result, even if the food material that is difficult to cool does not drop to the target temperature during the process of the first cooling control unit 501 and the product temperature remains high, the second cooling control unit 503 lowers the target pressure again. By cooling, it is possible to approach the target temperature.

また、本実施形態の真空冷却装置１は、第２冷却制御部５０３による制御の終了時に品温センサ２１の検出温度が目標温度に到達していない場合に、設定温度を更に第１温度を減算し、設定圧力値を減算された設定温度の圧力換算値である圧力値に置き換える。
これにより、冷却され難い食材が第２冷却制御部５０３の処理により途中で目標温度まで下がらずに品温が高止まりする場合であっても、更に目標圧力を下げて第２冷却制御部５０３による冷却を繰り返すことで、目標温度まで近づけることが可能となる。 Further, the vacuum cooling device 1 according to the present embodiment further subtracts the first temperature from the set temperature when the temperature detected by the product temperature sensor 21 does not reach the target temperature at the end of the control by the second cooling control unit 503. Then, the set pressure value is replaced with a pressure value that is a pressure converted value of the set temperature obtained by subtraction.
As a result, even if the food that is difficult to cool does not drop to the target temperature in the middle by the processing of the second cooling control unit 503 and the product temperature remains high, the target pressure is further lowered by the second cooling control unit 503. By repeating the cooling, it becomes possible to approach the target temperature.

また、本実施形態の真空冷却装置１は、品温センサ２１の検出温度が目標温度に到達した場合に、冷却を停止させる。
これにより、食材の過冷却を防止することができる。 Moreover, the vacuum cooling device 1 of this embodiment stops cooling, when the temperature detected by the product temperature sensor 21 reaches the target temperature.
Thereby, overcooling of a foodstuff can be prevented.

また、本実施形態の真空冷却装置１は、第２冷却制御部５０３による冷却後に、品温センサ２１の検出温度が目標温度に到達していない場合であっても、冷却槽２内の真空冷却運転を開始してから予め設定された最大冷却時間を経過した場合、冷却を停止させる。
これにより、第２冷却制御部５０３による処理を必要以上に繰り返さないことで、無駄を防ぐことができる。 Further, the vacuum cooling device 1 according to the present embodiment is capable of vacuum cooling in the cooling tank 2 even when the temperature detected by the product temperature sensor 21 has not reached the target temperature after cooling by the second cooling control unit 503. When the preset maximum cooling time has elapsed since the start of operation, the cooling is stopped.
Thereby, waste can be prevented by not repeating the process by the 2nd cooling control part 503 more than necessary.

また、本実施形態の真空冷却装置１は、第ｎ＋１番目の第２冷却制御部５０３による冷却後に、品温センサ２１の検出温度が前回（第ｎ番目）の第２冷却制御部５０３による冷却後における品温センサ２１の検出温度よりも高い場合、異常を警報し、運転を中断させる。
これにより、真空冷却装置１の異常を早期に検知することができ、異常な運転を早期に中断させることができる。 Further, in the vacuum cooling device 1 of the present embodiment, after the cooling by the (n + 1) th second cooling control unit 503, the temperature detected by the product temperature sensor 21 is after the cooling by the second (nth) second cooling control unit 503. When the temperature is higher than the temperature detected by the product temperature sensor 21, an abnormality is warned and the operation is interrupted.
Thereby, abnormality of the vacuum cooling device 1 can be detected at an early stage, and abnormal operation can be interrupted at an early stage.

また、本実施形態の真空冷却装置１は、今回（第ｎ＋１番目）の第２冷却制御部５０３による冷却後における、品温センサ２１の検出温度（ｎ＋１）が前回（第ｎ番目）の第２冷却制御部５０３による冷却後にける品温センサ２１の検出温度（ｎ）よりも低い場合であっても、検出温度差が所定の値以下の場合、冷却を停止させる。
これにより、冷却停止部５０５は、これ以上第２冷却制御部５０３による処理を繰り返しても、冷却効果が少ないと想定される場合、冷却を停止させることで、無駄を防ぐことができる。 Further, in the vacuum cooling device 1 of the present embodiment, the temperature (n + 1) detected by the product temperature sensor 21 after the cooling by the current (n + 1) th second cooling control unit 503 is the second (nth) second detected temperature. Even when the temperature is lower than the detected temperature (n) of the product temperature sensor 21 after cooling by the cooling control unit 503, the cooling is stopped if the detected temperature difference is equal to or smaller than a predetermined value.
Thereby, even if the cooling stop unit 505 repeats the processing by the second cooling control unit 503 any more, if it is assumed that the cooling effect is small, it is possible to prevent waste by stopping the cooling.

また、本実施形態の真空冷却装置１における第１目標圧力値は、目標温度から予め設定された冷却下限温度差を減算した温度の圧力換算値にすることができる。
これにより、品温センサ２１の検出温度を早く目標温度まで近づけることが可能となる。 Moreover, the 1st target pressure value in the vacuum cooling device 1 of this embodiment can be made into the pressure conversion value of the temperature which subtracted the preset cooling minimum temperature difference from target temperature.
As a result, the temperature detected by the product temperature sensor 21 can be quickly brought close to the target temperature.

また、本実施形態の真空冷却装置１における第１温度及び第２時間をそれぞれ第２冷却制御部５０３が実行される順序番号毎に予め設定することができる。
これにより、例えば、第１温度及び第２時間はｎが大きくなるにつれて、徐々に小さくして収束させるように構成することができる。 In addition, the first temperature and the second time in the vacuum cooling device 1 of the present embodiment can be set in advance for each sequence number in which the second cooling control unit 503 is executed.
Thereby, for example, the first temperature and the second time can be configured to gradually decrease and converge as n increases.

なお、本実施形態は、前述の実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。   The present embodiment is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

［変形例］
例えば、本実施形態において、減圧ライン３３の冷却槽２側に蒸気エゼクタを設けてもよい。蒸気エゼクタは、蒸気を噴出させることにより冷却槽２内の流体を吸引排出させる。この場合、熱交換器３２は、減圧ライン３３内の食材蒸気及び蒸気エゼクタの蒸気を予め冷却し凝縮させておくことで、冷却槽２内の流体温度を低下させるとともに、排出される流体の体積を減少させる。そうすることで、蒸気エゼクタによって真空ユニット３１の吸引側の圧力を高めることができ、冷却槽２内の減圧を有効に図ることができる。 [Modification]
For example, in the present embodiment, a steam ejector may be provided on the cooling tank 2 side of the decompression line 33. The steam ejector sucks and discharges the fluid in the cooling tank 2 by ejecting steam. In this case, the heat exchanger 32 cools and condenses the food vapor in the decompression line 33 and the vapor of the steam ejector in advance, thereby reducing the fluid temperature in the cooling tank 2 and the volume of the fluid to be discharged. Decrease. By doing so, the pressure on the suction side of the vacuum unit 31 can be increased by the steam ejector, and the pressure in the cooling tank 2 can be effectively reduced.

１ 真空冷却装置
２ 冷却槽
２１ 品温センサ
２２ 圧力センサ
３ 減圧手段
３１ 真空ユニット
３２ 熱変換器
３３ 減圧ライン
４ 復圧手段
４１ フィルター
４２ 復圧ライン
４３ 復圧操作弁
５ 制御装置
５０ 制御部
５０１ 第１冷却制御部
５０１１ 第１減圧制御部
５０１２ 第１冷却保持制御部
５０２ 品温判定部
５０３ 第２冷却制御部
５０３１ 第２冷却パラメータ設定部
５０３２ 第２減圧制御部
５０３３ 第２冷却保持制御部
５０４ 冷却中断部
５０５ 冷却停止部
５１ 記憶部 DESCRIPTION OF SYMBOLS 1 Vacuum cooling device 2 Cooling tank 21 Product temperature sensor 22 Pressure sensor 3 Pressure reduction means 31 Vacuum unit 32 Heat converter 33 Pressure reduction line 4 Pressure reduction means 41 Filter 42 Pressure reduction line 43 Pressure reduction operation valve 5 Controller 50 Control part 501 1st 1 Cooling Control Unit 5011 First Decompression Control Unit 5012 First Cooling Holding Control Unit 502 Product Temperature Determination Unit 503 Second Cooling Control Unit 5031 Second Cooling Parameter Setting Unit 5032 Second Decompression Control Unit 5033 Second Cooling Holding Control Unit 504 Cooling Interruption unit 505 Cooling stop unit 51 Storage unit

Claims (8)

被冷却物を収容する冷却槽と、
前記被冷却物の温度を検出する品温センサと、
前記冷却槽の内部空間を減圧する減圧手段と、
制御部と、
を備え、
前記制御部は、
前記減圧手段により、前記冷却槽の内部の圧力値を予め設定された目標温度に基づいて設定される第１目標圧力値まで減圧する第１減圧制御部と、前記冷却槽の内部の圧力値が前記第１目標圧力値に達した後、第１時間、前記冷却槽の内部の圧力値を前記第１目標圧力値に維持する第１冷却保持制御部と、を備える第１冷却制御部と、
前記第１冷却制御部による冷却後、前記品温センサの検出温度が前記目標温度に到達したか否かを判定する品温判定部と、
前記品温判定部により前記目標温度に到達していないと判定された場合に、設定温度として前記目標温度から予め設定された第１温度を減算した温度を設定するとともに、設定圧力値として前記設定温度の圧力換算値である圧力値を設定する第２冷却パラメータ設定部と、前記減圧手段により前記第２冷却パラメータ設定部により設定された設定圧力値まで減圧する第２減圧制御部と、前記冷却槽の内部の圧力値が前記設定圧力値に達した後、予め設定された第２時間、前記冷却槽の内部の圧力値を前記設定圧力値に維持する第２冷却保持制御部と、を備える第２冷却制御部と、
を備える真空冷却装置。 A cooling tank for storing an object to be cooled;
A product temperature sensor for detecting the temperature of the object to be cooled;
Decompression means for decompressing the internal space of the cooling tank;
A control unit;
With
The controller is
A first depressurization control unit configured to depressurize the pressure value inside the cooling tank to a first target pressure value set based on a preset target temperature by the depressurization means; and a pressure value inside the cooling tank A first cooling control unit comprising: a first cooling holding control unit that maintains a pressure value inside the cooling tank at the first target pressure value for a first time after reaching the first target pressure value;
A product temperature determination unit that determines whether the temperature detected by the product temperature sensor has reached the target temperature after cooling by the first cooling control unit;
When the product temperature determination unit determines that the target temperature has not been reached, a temperature obtained by subtracting a preset first temperature from the target temperature is set as a set temperature, and the set pressure value is set as the set pressure value. A second cooling parameter setting unit that sets a pressure value that is a pressure converted value of temperature; a second pressure reduction control unit that reduces the pressure to a set pressure value set by the second cooling parameter setting unit by the pressure reducing means; and the cooling A second cooling holding control unit that maintains the pressure value inside the cooling tank at the set pressure value for a second time set in advance after the pressure value inside the tank reaches the set pressure value; A second cooling control unit;
A vacuum cooling device comprising: 前記品温判定部は、前記第２冷却保持制御部による制御の終了時に前記品温センサの検出温度が前記目標温度に到達したか否かを判定し、
前記第２冷却パラメータ設定部は、前記品温判定部により前記目標温度に到達していないと判定された場合に、前記設定温度を、更に前記第１温度を減算した値に置き換えるとともに、前記設定圧力値を置き換えた前記設定温度の圧力換算値である圧力値に置き換える、
請求項１に記載の真空冷却装置。 The product temperature determination unit determines whether or not the temperature detected by the product temperature sensor has reached the target temperature at the end of control by the second cooling and holding control unit;
The second cooling parameter setting unit replaces the set temperature with a value obtained by further subtracting the first temperature when the product temperature determination unit determines that the target temperature has not been reached, and the setting Replace with the pressure value that is the pressure conversion value of the set temperature with the pressure value replaced,
The vacuum cooling device according to claim 1. 前記制御部は、
前記品温判定部により前記目標温度に到達したと判定された場合に、冷却を停止させる、
請求項１又は２に記載の真空冷却装置。 The controller is
When it is determined that the target temperature has been reached by the product temperature determination unit, cooling is stopped.
The vacuum cooling device according to claim 1 or 2. 前記制御部は、
前記第２冷却制御部による冷却後に、前記品温判定部により前記目標温度に到達していないと判定された場合であっても、前記冷却槽の内部の真空冷却運転を開始してから予め設定された最大冷却時間を経過した場合、冷却を停止させる、
請求項２又は請求項３に記載の真空冷却装置。 The controller is
Even if it is determined that the target temperature has not reached the target temperature after the cooling by the second cooling control unit, it is set in advance after starting the vacuum cooling operation inside the cooling tank. When the maximum cooling time specified has elapsed, cooling is stopped.
The vacuum cooling device according to claim 2 or claim 3. 前記第２冷却制御部による冷却後に、前記品温センサの検出温度を順番に記憶する記憶部を備え、
前記制御部は、前記第２冷却制御部による冷却後に、前記品温センサの検出温度が前記記憶部に記憶された前回の前記品温センサの検出温度よりも高い場合、異常を警報し、運転を中断させる、
請求項２乃至請求項４のいずれか１項に記載の真空冷却装置。 After the cooling by the second cooling control unit, comprising a storage unit for sequentially storing the temperature detected by the product temperature sensor,
When the temperature detected by the product temperature sensor is higher than the previous temperature detected by the product temperature sensor stored in the storage unit after the cooling by the second cooling control unit, the control unit warns the abnormality and operates. Interrupt
The vacuum cooling device according to any one of claims 2 to 4. 前記制御部は、前記第２冷却制御部による冷却後に、前記品温センサの検出温度が前記記憶部に記憶された前回の前記品温センサの検出温度よりも低い場合であっても、検出温度差が所定の値以下の場合、冷却を停止させる、
請求項５に記載の真空冷却装置。 The control unit may detect the detected temperature even when the detected temperature of the product temperature sensor is lower than the detected temperature of the previous product temperature sensor stored in the storage unit after cooling by the second cooling control unit. If the difference is less than the predetermined value, stop cooling.
The vacuum cooling device according to claim 5. 前記第１目標圧力値は、前記目標温度から予め設定された冷却下限温度差を減算した温度の圧力換算値である、請求項１乃至請求項６のいずれか１項に記載の真空冷却装置。   The vacuum cooling device according to any one of claims 1 to 6, wherein the first target pressure value is a pressure converted value of a temperature obtained by subtracting a preset cooling lower limit temperature difference from the target temperature. 前記第１温度は、前記第２冷却制御部が実行される順序番号毎に予め設定され、
前記第２時間は、前記第２冷却保持制御部が実行される順序番号毎に予め設定される、
請求項１乃至請求項７のいずれか１項に記載の真空冷却装置。 The first temperature is preset for each sequence number in which the second cooling control unit is executed,
The second time is preset for each sequence number in which the second cooling and holding control unit is executed.
The vacuum cooling device according to any one of claims 1 to 7.
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