JP2019132435A - Vacuum cooling device - Google Patents

Vacuum cooling device Download PDF

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JP2019132435A
JP2019132435A JP2018012124A JP2018012124A JP2019132435A JP 2019132435 A JP2019132435 A JP 2019132435A JP 2018012124 A JP2018012124 A JP 2018012124A JP 2018012124 A JP2018012124 A JP 2018012124A JP 2019132435 A JP2019132435 A JP 2019132435A
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pressure
processing tank
vacuum
cooling
cooled
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JP6969744B2 (en
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西山　将人
Masato Nishiyama
将人 西山
保次郎 中井
Yasujiro Nakai
保次郎 中井
伸基 明尾
Nobumoto Akio
伸基 明尾
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SAMSON CO Ltd
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Abstract

To provide a vacuum cooling device capable of properly controlling an operation without affected by fluctuation of an atmospheric pressure.SOLUTION: In a vacuum cooling device having a processing tank accommodating an object to be cooled, and a vacuum generation device sucking a gas in the processing tank, and cooling the object to be cooled accommodated in the processing tank by making vacuum in the processing tank, a pressure detection device is disposed to detect a pressure in the processing tank, and in a cooling process for cooling the object to be cooled, the inside of the processing tank is decompressed until the detected pressure by the pressure detection device reaches a target pressure, and then a vacuum releasing process for recovering the atmospheric pressure in the processing tank is performed. The pressure detection device for detecting the pressure in the processing tank is a pressure detection device detecting an absolute pressure, the atmospheric pressure in starting the cooling operation is stored, then the pressure representing in absolute pressure in the processing tank is detected in the cooling process for decompressing the processing tank, to control the pressure, and in the vacuum releasing process, completion determination is performed when the pressure in the processing tank reaches a value obtained by subtracting a tolerance from the stored pressure in starting the operation.SELECTED DRAWING: Figure 1

Description

本発明は、加熱調理された食品などの被冷却物を処理槽内に収容し、処理槽内を減圧することによって被冷却物内の水分を蒸発させ、蒸発による気化熱によって被冷却物を急速に冷却する真空冷却装置に関するものである。 The present invention accommodates an object to be cooled such as cooked food in a processing tank, evaporates moisture in the object to be cooled by reducing the pressure in the processing tank, and rapidly heats the object to be cooled by heat of vaporization due to evaporation. The present invention relates to a vacuum cooling device that cools the air.

特開２０１７−１６１１１８号公報に記載があるように、被冷却物を収容している処理槽内の気体を外部へ排気し、処理槽内を減圧することで、処理槽内の圧力を処理槽内に収容している被冷却物の飽和蒸気圧力よりも低下させ、被冷却物内から水分を蒸発させることにより、その気化熱を利用して被冷却物の冷却を図る真空冷却装置が知られている。被冷却物を収容している処理槽内を減圧し、処理槽内での沸点を被冷却物の温度よりも低下させると、被冷却物中の水分が蒸発し、その際に被冷却物から気化熱を奪うため、被冷却物を短時間で冷却することができる。給食センターなどにおいては、加熱調理食品を冷却する際に細菌が繁殖しやすい温度帯をできるだけ早く通過させることが要望されており、真空冷却装置であれば短時間で被冷却物の中心部まで冷却が可能であるために広く用いられている。 As described in Japanese Patent Application Laid-Open No. 2017-161118, the gas in the processing tank containing the object to be cooled is exhausted to the outside, and the pressure in the processing tank is reduced by reducing the pressure in the processing tank. There is known a vacuum cooling device that cools an object to be cooled by using the heat of vaporization by lowering the saturated vapor pressure of the object to be cooled and evaporating moisture from the object to be cooled. ing. When the inside of the treatment tank containing the object to be cooled is depressurized and the boiling point in the treatment tank is lowered below the temperature of the object to be cooled, moisture in the object to be cooled evaporates, and at that time, from the object to be cooled Since the heat of vaporization is taken away, the object to be cooled can be cooled in a short time. In food service centers, etc., when cooling cooked foods, it is required to pass through a temperature zone where bacteria can easily propagate as soon as possible. If it is a vacuum cooling device, it cools to the center of the object to be cooled in a short time. Is widely used because it is possible.

真空冷却装置には、目標とする被冷却物の冷却温度を設定しておき、処理槽内に収容した被冷却物の温度が目標温度になるまで処理槽内を減圧しての真空冷却を行う。真空冷却では、目標温度が決まればその温度に対応する圧力まで処理槽内を減圧することで被冷却物の冷却を行える。真空冷却装置では処理槽内の圧力を検出する圧力検出装置を設置しておき、目標の圧力まで減圧するとその圧力で維持するように制御する。処理槽内を目標圧力まで減圧し、被冷却物内から水分を蒸発させると、気化熱によって被冷却物の温度は低下し、被冷却物の温度が所望の目標温度以下になると、冷却を終了する。 In the vacuum cooling device, the target cooling temperature of the object to be cooled is set, and vacuum cooling is performed by reducing the pressure in the processing tank until the temperature of the object to be cooled accommodated in the processing tank reaches the target temperature. . In the vacuum cooling, if the target temperature is determined, the object to be cooled can be cooled by reducing the pressure in the treatment tank to a pressure corresponding to the temperature. In the vacuum cooling device, a pressure detection device for detecting the pressure in the processing tank is installed, and when the pressure is reduced to the target pressure, control is performed so as to maintain the pressure. When the inside of the treatment tank is depressurized to the target pressure and moisture is evaporated from the object to be cooled, the temperature of the object to be cooled decreases due to the heat of vaporization, and the cooling ends when the temperature of the object to be cooled becomes below the desired target temperature. To do.

冷却を終了した段階では処理槽内は高真空となっており、その状態では処理槽の扉を開くことができないため、処理槽内へ空気を導入して処理槽内を大気圧まで戻す真空解除の工程を行う。処理槽内が大気圧に戻ると、真空冷却装置では工程終了の合図を出力し、合図を受けて処理槽の扉を開き、処理槽内から被冷却物を取り出すことで１バッチの工程を終了する。 When the cooling is finished, the inside of the treatment tank is at a high vacuum, and in that state, the door of the treatment tank cannot be opened, so the vacuum is released by introducing air into the treatment tank and returning the treatment tank to atmospheric pressure. The process is performed. When the inside of the processing tank returns to atmospheric pressure, the vacuum cooling device outputs a signal indicating the end of the process, receives the signal, opens the door of the processing tank, and takes out the object to be cooled from the processing tank to complete one batch of processes. To do.

以上のように真空冷却装置の制御は処理槽内の圧力に基づいて行っている。圧力の検出は、大気圧を基準としたゲージ圧と、絶対真空を基準とした絶対圧がある。大気圧を基準としたゲージ圧に基づいて真空冷却運転を行った場合、気圧の変化によって冷却温度や状態がばらつく問題があった。気圧は大気の状態によって常に変動しており、気圧が高い日には、大気圧から所定圧力差分低下させたゲージ圧での目標圧力は、絶対圧で換算すると相対的に高い値となる。減圧した状態での圧力が高いと冷却に時間がかかり、さらには目標温度まで低下しないことも考えられる。一方で絶対圧に基づいて真空冷却の運転を行う場合、真空解除工程で処理槽内は周囲の圧力と同じ大気圧まで戻っていても、気圧が低い場合の大気圧は絶対圧を基準とした１気圧より低いことになる。この場合運転制御装置では、１気圧を真空解除工程の終了圧力としていると、いつまでたっても終了圧力には到達しなことになり、工程終了の判定が行われないことになる。 As described above, the vacuum cooling device is controlled based on the pressure in the processing tank. Pressure detection includes a gauge pressure based on atmospheric pressure and an absolute pressure based on absolute vacuum. When the vacuum cooling operation is performed based on the gauge pressure based on the atmospheric pressure, there is a problem that the cooling temperature and the state vary due to the change in the atmospheric pressure. Atmospheric pressure constantly fluctuates depending on atmospheric conditions, and on high days when atmospheric pressure is high, the target pressure at a gauge pressure obtained by reducing a predetermined pressure difference from atmospheric pressure is a relatively high value when converted to absolute pressure. If the pressure in the depressurized state is high, it takes time for cooling, and it is also conceivable that the pressure does not decrease to the target temperature. On the other hand, when vacuum cooling operation is performed based on absolute pressure, the atmospheric pressure when the atmospheric pressure is low is based on the absolute pressure even if the treatment tank returns to the same atmospheric pressure as the surrounding pressure in the vacuum release process. It will be lower than 1 atm. In this case, in the operation control apparatus, if 1 atm is used as the end pressure of the vacuum release process, the end pressure will not be reached any time, and the end of the process will not be determined.

特開２０１７−１６１１１８号公報JP 2017-161118 A

本発明が解決しようとする課題は、処理槽内を減圧することで処理槽内の被冷却物を冷却する真空冷却装置であって、処理槽内の圧力を検出して真空冷却の工程を行うようにしている真空冷却装置において、大気圧の変動に影響されず適切な運転制御を行うことのできる真空冷却装置を提供することにある。 A problem to be solved by the present invention is a vacuum cooling device that cools an object to be cooled in a processing tank by reducing the pressure in the processing tank, and detects a pressure in the processing tank to perform a vacuum cooling process. An object of the present invention is to provide a vacuum cooling device capable of performing appropriate operation control without being affected by fluctuations in atmospheric pressure.

請求項１に記載の発明は、被冷却物を収容する処理槽と、処理槽内の気体を吸引する真空発生装置を持ち、処理槽内を真空化することで処理槽内に収容している被冷却物の冷却を行う真空冷却装置であって、処理槽内の圧力を検出する圧力検出装置を設けておき、被冷却物の冷却を行う冷却工程時には、前記圧力検出装置での検出圧力が目標圧力となるまで処理槽内部を減圧し、冷却工程を終了すると処理槽内を大気圧に戻す真空解除工程を行うようにしている真空冷却装置において、前記処理槽内の圧力を検出する圧力検出装置は絶対圧を検出する圧力検出装置とし、圧力検出装置によって冷却運転開始時における気圧を検出して保存するようにしておき、処理槽内を減圧する冷却工程時には処理槽内圧力を絶対圧で検出して圧力制御を行い、真空解除工程では処理槽内圧力が前記の保存しておいた運転開始時圧力から余裕度を減算した値に到達した場合に終了判定を行うものであることを特徴とする。 Invention of Claim 1 has the processing tank which accommodates to-be-cooled object, and the vacuum generator which attracts | sucks the gas in a processing tank, and is accommodated in the processing tank by evacuating the inside of a processing tank. A vacuum cooling device for cooling an object to be cooled, provided with a pressure detection device for detecting the pressure in the processing tank, and at the cooling step for cooling the object to be cooled, the pressure detected by the pressure detection device is In a vacuum cooling apparatus that performs a vacuum releasing step of reducing the pressure inside the treatment tank until the target pressure is reached, and returning the inside of the treatment tank to atmospheric pressure when the cooling process is completed, pressure detection for detecting the pressure in the treatment tank The device is a pressure detection device that detects the absolute pressure. The pressure detection device detects the air pressure at the start of the cooling operation and stores it, and during the cooling process to depressurize the treatment tank, the pressure in the treatment tank is the absolute pressure. Detect and perform pressure control In the vacuum release step is characterized in that performs a termination determination when the treatment tank pressure reaches a value obtained by subtracting the margin from the saved which had been operated at the start pressure.

本発明を実施することにより、冷却工程と真空解除工程での制御を、周囲の気圧変化に影響されず適切に行うことができるようになる。 By implementing the present invention, the control in the cooling process and the vacuum releasing process can be appropriately performed without being influenced by the ambient pressure change.

本発明を実施している真空冷却装置の実施例でのフロー図Flow diagram in an embodiment of a vacuum cooling device implementing the present invention 本発明を実施している真空冷却装置の運転工程例を示したフローチャートThe flowchart which showed the example of the operation process of the vacuum cooling device which is implementing this invention

本発明の一実施例を図面を用いて説明する。図１は本発明を実施している真空冷却装置の実施例でのフロー図、図２は本発明を実施している真空冷却装置の運転工程例を示したフローチャートである。真空冷却装置は、被冷却物７を収容する処理槽２と、処理槽２内の気体を排出する真空発生装置１を持つ。真空冷却装置は、処理槽２内を減圧することで処理槽２内に収容した被冷却物内の水分を蒸発させるものであり、蒸発時の気化熱によって処理槽２に収容した被冷却物７の冷却を行う。 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a flow chart in an embodiment of a vacuum cooling apparatus embodying the present invention, and FIG. 2 is a flowchart showing an operation process example of the vacuum cooling apparatus embodying the present invention. The vacuum cooling device has a processing tank 2 that accommodates an object 7 to be cooled and a vacuum generator 1 that discharges gas in the processing tank 2. The vacuum cooling device evaporates the water in the object to be cooled accommodated in the treatment tank 2 by reducing the pressure in the treatment tank 2, and the object to be cooled 7 accommodated in the treatment tank 2 by heat of vaporization at the time of evaporation. Cool down.

真空発生装置１は真空配管９で処理槽２と接続しており、処理槽２内の気体は真空発生装置１を作動することで真空配管９を通して排出する。真空配管９の途中には、処理槽２から吸引してきた気体を冷却するための熱交換器８を設けておく。処理槽から吸引している気体は被冷却物内から蒸発させた蒸気を含んでおり、水分は蒸気になると体積が大幅に大きくなるため、そのままでは大容積の蒸気を真空発生装置１へ送ることになり、それでは真空発生装置１の効率が悪くなる。そのために真空配管９の途中に熱交換器８を設けており、熱交換器８で吸引気体の冷却を行うことで蒸気を凝縮させ、真空発生装置１で排出しなければならない気体の体積を縮小する。熱交換器８には冷却用の冷水を供給する冷水ユニット３を接続しており、冷水ユニット３と熱交換器８の間で冷水の循環を行わせるようにしている。熱交換器８で分離した凝縮水は、熱交換器８の下方に設置している凝縮水タンクにためておき、冷却運転終了後に凝縮水タンクから排出する。 The vacuum generator 1 is connected to the processing tank 2 by a vacuum pipe 9, and the gas in the processing tank 2 is discharged through the vacuum pipe 9 by operating the vacuum generator 1. A heat exchanger 8 for cooling the gas sucked from the processing tank 2 is provided in the middle of the vacuum pipe 9. The gas sucked from the treatment tank contains the vapor evaporated from the object to be cooled, and the volume of the moisture greatly increases when it becomes vapor, so that a large volume of vapor is sent to the vacuum generator 1 as it is. Then, the efficiency of the vacuum generator 1 is deteriorated. For this purpose, a heat exchanger 8 is provided in the middle of the vacuum pipe 9, the suction gas is cooled by the heat exchanger 8, the vapor is condensed, and the volume of the gas that must be discharged by the vacuum generator 1 is reduced. To do. A chilled water unit 3 that supplies chilled water for cooling is connected to the heat exchanger 8, and the chilled water is circulated between the chilled water unit 3 and the heat exchanger 8. The condensed water separated by the heat exchanger 8 is stored in a condensed water tank installed below the heat exchanger 8, and is discharged from the condensed water tank after the cooling operation.

処理槽２には処理槽内の圧力を計測する圧力検出装置５と、被冷却物７の温度を計測する温度検出装置４を設けておく。圧力検出装置５で計測した処理槽内の圧力と温度検出装置４で計測した被冷却物の温度は、真空冷却装置の運転を制御する運転制御装置６へ出力する。運転制御装置６は、真空発生装置１や真空解除弁１０など、真空冷却装置の各機器を制御することで真空冷却装置の運転を行うものである。運転制御装置６では、経過時間や温度検出装置５で計測している被冷却物７の温度、圧力検出装置５で計測している処理槽内圧力などに基づいて各装置を制御する。真空解除弁１０は処理槽２内に外気を取り込むためのものであり、処理槽内を高真空として被冷却物の冷却を行った後、真空解除弁１０を開くことで処理槽内に外気を導入し、処理槽内を大気圧に戻す。また真空解除弁１０は、真空発生装置１を作動させた状態で真空解除弁１０を開閉し、処理槽２内へ外気を導入することにより、処理槽２内の圧力を調節することにも使用される。 The treatment tank 2 is provided with a pressure detection device 5 that measures the pressure in the treatment tank and a temperature detection device 4 that measures the temperature of the object 7 to be cooled. The pressure in the processing tank measured by the pressure detection device 5 and the temperature of the object to be cooled measured by the temperature detection device 4 are output to the operation control device 6 that controls the operation of the vacuum cooling device. The operation control device 6 operates the vacuum cooling device by controlling each device of the vacuum cooling device such as the vacuum generator 1 and the vacuum release valve 10. In the operation control device 6, each device is controlled based on the elapsed time, the temperature of the object to be cooled 7 measured by the temperature detection device 5, the pressure in the processing tank measured by the pressure detection device 5, and the like. The vacuum release valve 10 is for taking outside air into the processing tank 2, and after cooling the object to be cooled by setting the inside of the processing tank to a high vacuum, the vacuum release valve 10 is opened to draw outside air into the processing tank. Introduce and return the inside of the treatment tank to atmospheric pressure. The vacuum release valve 10 is also used to adjust the pressure in the processing tank 2 by opening and closing the vacuum release valve 10 while the vacuum generator 1 is in operation and introducing outside air into the processing tank 2. Is done.

真空冷却を行う場合、先に冷水ユニット３を作動し、熱交換器８のタンクに冷水を準備しておく。そして処理槽２内に被冷却物７を収容し、処理槽２の扉を閉じて処理槽２内を密閉した状態で真空発生装置１の作動を行う。真空発生装置１を作動すると、処理槽２内の空気が真空配管９を通して真空発生装置１へ送られ、真空発生装置１から系外へ空気を排出する。真空配管９を通して送られる空気は、熱交換器８を通る際に冷却されて体積を縮小する。特に空気中に蒸気が含まれていた場合、気体を冷却することで凝縮させると体積は大幅に縮小させることができる。 When vacuum cooling is performed, the cold water unit 3 is operated first, and cold water is prepared in the tank of the heat exchanger 8. And the to-be-cooled object 7 is accommodated in the processing tank 2, the vacuum generator 1 is operated in the state which closed the door of the processing tank 2 and sealed the inside of the processing tank 2. When the vacuum generator 1 is operated, the air in the processing tank 2 is sent to the vacuum generator 1 through the vacuum pipe 9 and the air is discharged from the vacuum generator 1 to the outside of the system. The air sent through the vacuum pipe 9 is cooled when passing through the heat exchanger 8 to reduce the volume. In particular, when steam is contained in the air, the volume can be greatly reduced by condensing by cooling the gas.

図２のフローチャートに基づいて運転工程を説明する。運転開始前に処理槽２内へ被冷却物７を収容し、冷却の準備を行っておく。運転制御装置６では、真空冷却運転を開始する前の処理槽２内が大気圧状態の時に圧力検出装置５で処理槽２内の圧力を検出し、運転開始時の絶対圧として運転制御装置６に保存しおく。冷却工程では、処理槽２を密閉した状態で真空発生装置１を作動し、処理槽２内の圧力を低下させる。真空発生装置１を作動すると処理槽２内の空気が排出され、処理槽２内の圧力が低下していく。減圧時には目標とする圧力を設定しておき、圧力検出装置５で検出している絶対圧の処理槽内圧力が目標圧力に到達するように真空発生装置１の運転を行い、必要に応じて真空解除弁１０を開閉することで圧力を調節する。被冷却物７の温度は、処理槽２内の圧力低下によって発生する被冷却物内水分の気化によって低下するため、処理槽２内の圧力によって被冷却物７の温度は定まる。運転制御装置６は、処理槽２内の圧力を被冷却物７の目標温度の対応する飽和圧力である目標制御圧力となるように圧力制御を行う。 An operation process is demonstrated based on the flowchart of FIG. Before starting the operation, the object to be cooled 7 is accommodated in the treatment tank 2 to prepare for cooling. In the operation control device 6, when the inside of the treatment tank 2 before starting the vacuum cooling operation is in the atmospheric pressure state, the pressure detection device 5 detects the pressure in the treatment tank 2, and the operation control device 6 is used as an absolute pressure at the start of the operation. Save to. In the cooling step, the vacuum generator 1 is operated in a state where the processing tank 2 is sealed, and the pressure in the processing tank 2 is reduced. When the vacuum generator 1 is operated, the air in the processing tank 2 is discharged, and the pressure in the processing tank 2 decreases. The target pressure is set at the time of depressurization, and the vacuum generator 1 is operated so that the absolute pressure in the processing tank detected by the pressure detection device 5 reaches the target pressure, and the vacuum is generated as necessary. The pressure is adjusted by opening and closing the release valve 10. Since the temperature of the object to be cooled 7 decreases due to vaporization of moisture in the object to be cooled generated due to the pressure drop in the processing tank 2, the temperature of the object to be cooled 7 is determined by the pressure in the processing tank 2. The operation control device 6 performs pressure control so that the pressure in the processing tank 2 becomes a target control pressure that is a saturation pressure corresponding to the target temperature of the object 7 to be cooled.

この時、処理槽２内の圧力制御は圧力検出装置５で検出している絶対圧で行い、絶対圧で設定した目標圧力まで減圧することで、冷却工程時の圧力にバラツキが発生することを防止する。絶対圧に基づいて制御するため、周囲の気圧が変化していても処理槽内の圧力は毎回同じ値に制御されることになり、処理槽内の被冷却物７における蒸気の発生は一定となるため、被冷却物７の冷却状況は安定することになる。 At this time, the pressure in the treatment tank 2 is controlled by the absolute pressure detected by the pressure detection device 5, and by reducing the pressure to the target pressure set by the absolute pressure, there is a variation in the pressure during the cooling process. To prevent. Since the control is based on the absolute pressure, the pressure in the treatment tank is controlled to the same value every time even if the ambient atmospheric pressure changes, and the generation of steam in the object 7 to be cooled in the treatment tank is constant. Therefore, the cooling state of the object 7 to be cooled is stabilized.

処理槽２内の圧力を目標圧力に制御し、処理槽２内に収容している被冷却物７の温度が目標とする温度まで低下すると、冷却工程を終了して処理槽２内の真空解除工程を行う。冷却工程時には処理槽２内の圧力は低下しており、その状態では大気圧状態にある外部との圧力差があるために扉を開くことはできない。そのため、処理槽内に外気を導入する真空解除工程を行い、処理槽内が大気圧にほぼ等しくなるまで待つ必要がある。 When the pressure in the processing tank 2 is controlled to the target pressure and the temperature of the object 7 to be cooled stored in the processing tank 2 falls to the target temperature, the cooling process is terminated and the vacuum in the processing tank 2 is released. Perform the process. During the cooling process, the pressure in the treatment tank 2 is lowered, and in that state, the door cannot be opened because there is a pressure difference from the outside in the atmospheric pressure state. Therefore, it is necessary to perform a vacuum releasing step for introducing outside air into the processing tank and wait until the inside of the processing tank becomes substantially equal to the atmospheric pressure.

真空解除工程では、真空発生装置１の運転を停止し、真空解除弁１０を開いて処理槽２内へ外気を取り込む。真空解除弁１０を開くと、処理槽２内は高真空、周囲は大気圧であるため、真空解除弁１０を通して大気圧状態の外気が処理槽２内に流れ込み、外気の取り込みによって処理槽２の圧力は大気圧へ向けて上昇していく。運転制御装置６では、圧力検出装置５で検出している処理槽内の絶対圧が、終了判定圧力値以上になったことを検出した場合に終了判定を行い、終了の合図を出力する。 In the vacuum release step, the operation of the vacuum generator 1 is stopped, the vacuum release valve 10 is opened, and the outside air is taken into the processing tank 2. When the vacuum release valve 10 is opened, the inside of the treatment tank 2 is at a high vacuum and the surroundings are at atmospheric pressure. Therefore, outside air in the atmospheric pressure flows into the treatment tank 2 through the vacuum release valve 10, and the intake of the outside air causes The pressure increases toward atmospheric pressure. When the operation control device 6 detects that the absolute pressure in the processing tank detected by the pressure detection device 5 is equal to or higher than the end determination pressure value, the operation control device 6 performs the end determination and outputs an end signal.

終了判定圧力値は、保存しておいた運転開始時の圧力から余裕度分（α）を減算した値とする。終了判定圧力値も絶対圧で設定する。終了判定圧力値を１気圧（１０１３２５Pa）に設定しておくと、処理槽が標準の大気圧になった時に終了判定を行うことになるが、絶対圧を基準とした１気圧は標準状態での大気圧であり、その日の大気圧と同じではない。真空解除弁１０を開いても処理槽２内の圧力が周囲の気圧より高くなることはないため、気圧が低い日や標高が高い場所では、処理槽２内の圧力は絶対圧での１気圧に到達することはない。終了判定圧力値を固定の値としていた場合には、処理槽内の圧力が周囲の気圧に等しくなっていても終了判定圧力に達していないために終了判定を行えないということがある。 The end determination pressure value is a value obtained by subtracting the margin (α) from the stored pressure at the start of operation. The end judgment pressure value is also set as an absolute pressure. If the end determination pressure value is set to 1 atm (101325 Pa), the end determination will be performed when the treatment tank reaches the standard atmospheric pressure, but 1 atm based on the absolute pressure is the standard state. Atmospheric pressure, not the same as the atmospheric pressure of the day. Even if the vacuum release valve 10 is opened, the pressure in the processing tank 2 does not become higher than the surrounding atmospheric pressure. Therefore, on a day with low atmospheric pressure or a place with high altitude, the pressure in the processing tank 2 is 1 atm in absolute pressure. Never reach. When the end determination pressure value is a fixed value, the end determination may not be performed because the end determination pressure is not reached even if the pressure in the processing tank is equal to the ambient pressure.

そのため、終了判定圧力値は保存しておいた運転開始時の気圧を基準とする。運転開始時の気圧を基準にすることで、日々変化する気圧のバラツキに影響されず、処理槽内が外部の気圧とほぼ等しい値まで復圧させた時に終了の判定を行うことができる。また、運転開始時の圧力＝終了判定値とした場合、測定誤差や気圧の低下が発生すると、処理槽内の圧力が大気圧に等しくなった状態でも、圧力検出装置５による計測値が終了判定値に到達しないということになり、終了判定を行うことができないことがある。運転開始時圧力−１０KPaを終了判定値とするなど、終了判定値は運転開始時の圧力から余裕度分低い値とすることで、測定誤差や気圧の変化が発生した場合でも終了の判定を行うことができる。運転制御装置６が真空解除終了の合図を出力した後に、処理槽２内から冷却の終わった被冷却物７の取り出しを行うことで、真空冷却工程が終了する。 Therefore, the end determination pressure value is based on the stored atmospheric pressure at the start of operation. By using the atmospheric pressure at the start of operation as a reference, it is possible to determine the end when the inside of the treatment tank is restored to a value almost equal to the external atmospheric pressure without being affected by the variation in atmospheric pressure that changes daily. Further, when the pressure at the start of operation is set to the end determination value, if a measurement error or a decrease in atmospheric pressure occurs, the measurement value by the pressure detection device 5 is determined to end even when the pressure in the processing tank is equal to the atmospheric pressure. This means that the value will not be reached, and the end determination may not be performed. By setting the end determination value to a value that is lower than the pressure at the start of operation by a margin, such as a pressure at start of operation of −10 KPa, the end determination is performed even when a measurement error or a change in atmospheric pressure occurs. be able to. After the operation control device 6 outputs a signal indicating the end of the vacuum release, the object to be cooled 7 that has been cooled is taken out of the processing tank 2 to complete the vacuum cooling process.

なお、本発明は以上説明した実施例に限定されるものではなく、多くの変形が本発明の技術的思想内で当分野において通常の知識を有する者により可能である。 The present invention is not limited to the embodiments described above, and many modifications can be made by those having ordinary knowledge in the art within the technical idea of the present invention.

１ 真空発生装置
２ 処理槽
３ 冷水ユニット
４ 温度検出装置
５ 圧力検出装置
６ 運転制御装置
７ 被冷却物
８ 熱交換器
９ 真空配管
１０ 真空解除弁


1 Vacuum generator
2 treatment tank
3 Cold water unit 4 Temperature detection device 5 Pressure detection device 6 Operation control device 7 Object to be cooled 8 Heat exchanger 9 Vacuum piping 10 Vacuum release valve


Claims (1)

被冷却物を収容する処理槽と、処理槽内の気体を吸引する真空発生装置を持ち、処理槽内を真空化することで処理槽内に収容している被冷却物の冷却を行う真空冷却装置であって、処理槽内の圧力を検出する圧力検出装置を設けておき、被冷却物の冷却を行う冷却工程時には、前記圧力検出装置での検出圧力が目標圧力となるまで処理槽内部を減圧し、冷却工程を終了すると処理槽内を大気圧に戻す真空解除工程を行うようにしている真空冷却装置において、前記処理槽内の圧力を検出する圧力検出装置は絶対圧を検出する圧力検出装置とし、圧力検出装置によって冷却運転開始時における気圧を検出して保存するようにしておき、処理槽内を減圧する冷却工程時には処理槽内圧力を絶対圧で検出して圧力制御を行い、真空解除工程では処理槽内圧力が前記の保存しておいた運転開始時圧力から余裕度を減算した値に到達した場合に終了判定を行うものであることを特徴とする真空冷却装置。

Vacuum cooling that cools the object to be cooled stored in the processing tank by vacuuming the processing tank with a processing tank for storing the object to be cooled and a vacuum generator for sucking the gas in the processing tank A pressure detecting device for detecting the pressure in the processing tank, and during the cooling process for cooling the object to be cooled, the inside of the processing tank is maintained until the pressure detected by the pressure detecting device becomes a target pressure. In a vacuum cooling device that performs a vacuum releasing step of reducing the pressure and returning the inside of the processing tank to atmospheric pressure when the cooling process is completed, the pressure detection device that detects the pressure in the processing tank is a pressure detection that detects the absolute pressure The pressure at the start of the cooling operation is detected and stored by the pressure detection device, and the pressure in the processing tank is detected by absolute pressure during the cooling process to depressurize the inside of the processing tank. Process in release process Vacuum cooling device, characterized in that the inner pressure in which determines the termination when it reaches the value obtained by subtracting the margin from the saved which had been operated at the start pressure.

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012082060A1 (en) * 2010-12-16 2012-06-21 Revent International Ab Arrangement and method for rehydrating edible products
JP2014066383A (en) * 2012-09-25 2014-04-17 Samson Co Ltd Vacuum cooling apparatus
JP2017166767A (en) * 2016-03-17 2017-09-21 株式会社サムソン Vacuum cooling apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012082060A1 (en) * 2010-12-16 2012-06-21 Revent International Ab Arrangement and method for rehydrating edible products
JP2014066383A (en) * 2012-09-25 2014-04-17 Samson Co Ltd Vacuum cooling apparatus
JP2017166767A (en) * 2016-03-17 2017-09-21 株式会社サムソン Vacuum cooling apparatus

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