JP2014119238A - Refrigeration system and refrigeration method of perishable article - Google Patents

Refrigeration system and refrigeration method of perishable article Download PDF

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JP2014119238A
JP2014119238A JP2012276824A JP2012276824A JP2014119238A JP 2014119238 A JP2014119238 A JP 2014119238A JP 2012276824 A JP2012276824 A JP 2012276824A JP 2012276824 A JP2012276824 A JP 2012276824A JP 2014119238 A JP2014119238 A JP 2014119238A
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water
fresh
refrigeration
snow
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JP5935683B2 (en
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Toshiji Wakayama
敏次 若山
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SHOWA REITO PLANT KK
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
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Abstract

PROBLEM TO BE SOLVED: To provide a refrigeration system that keeps the quality of perishable articles, and a refrigeration method.SOLUTION: A refrigeration system for perishable articles includes: a refrigerator (11) settable to a predetermined temperature and storing perishable articles (F); and snow-like ice particle generation means (22, 23, 12) for generating snow-like ice particles (S) inside the refrigerator (11). The snow-like ice particle generation means (22, 23, 12) includes: a water temperature adjustment device (22) for adjusting water to a predetermined temperature within a range of higher than 0°C and 5°C or less; a pressurization pump (23) for pressurizing water subjected to water temperature adjustment by the water temperature adjustment device (22); and means (12) for spraying water pressurized by the pressurization pump (23) inside the refrigerator (11).

Description

本発明は、魚介類等の生鮮品の鮮度を高品質に保持できる冷蔵システム及び冷蔵方法に関する。   The present invention relates to a refrigeration system and a refrigeration method that can maintain the freshness of fresh products such as seafood with high quality.

魚介類等の生鮮品の鮮度を保持するために、例えば周囲に破砕した氷を充填して保存することがよく行われている。通常の氷は、魚介類との間に空気の隙間ができて密着できない部分があるという問題点がある。シャーベット状の氷は、魚介類に密着できるが、水分量が多いために魚介類に対して悪影響を及ぼす。特許文献１では、冷却器により過冷却した加圧海水を氷結晶槽内に放出して結晶成長させて雪状氷を生成させる氷結晶生成装置を開示している。特許文献１では、生成された雪状氷を取り出して、魚介類の冷蔵に使用する。   In order to maintain the freshness of fresh products such as seafood, for example, it is often carried out by filling and storing crushed ice, for example. Ordinary ice has a problem that there is an air gap between fish and seafood and there is a part that cannot be adhered. Although sherbet-like ice can be in close contact with seafood, it has an adverse effect on seafood due to its high water content. Patent Document 1 discloses an ice crystal generating apparatus that generates snow-like ice by discharging pressurized seawater supercooled by a cooler into an ice crystal tank to grow crystals. In Patent Document 1, the generated snowy ice is taken out and used for refrigeration of seafood.

特開２００７−３０９６２９号公報JP 2007-309629 A 特開２００７−１５５１７２号公報JP 2007-155172 A

特許文献１では、水分量の少ない雪状氷を使用する点は好ましいが、その雪状氷を装置から取り出して魚介類に使用するので、従来の破砕氷やシャーベット氷と同様に人の作業により魚介類の周囲に充填する方法となる。しかしながら、魚介類の表面形状は、細かな凹凸があるものが多く、その隅々にまで満遍なく雪状氷を充填することは難しい。また、雪状氷を取り出して運ぶ間に雪状氷が融けてシャーベット状となる可能性もある。   In Patent Document 1, it is preferable to use snow-like ice with a small amount of water. However, since the snow-like ice is taken out from the apparatus and used for seafood, it can be used by human work in the same way as conventional crushed ice and sherbet ice. It becomes a method of filling around the seafood. However, the surface shape of fish and shellfish often has fine irregularities, and it is difficult to uniformly fill snow-like ice in every corner. Further, there is a possibility that the snow-like ice melts and becomes a sherbet while the snow-like ice is taken out and carried.

以上の現状に鑑み本発明は、魚介類等の生鮮品の鮮度を保持するために、雪状の氷粒が生鮮品の表面を満遍なくかつ速やかに覆うことにより冷蔵効果を発揮することができるシステム及び方法を提供することを目的とする。   In view of the above situation, in order to maintain the freshness of fresh products such as seafood, the present invention can exhibit a refrigeration effect by covering the surface of fresh products uniformly and quickly with snow-like ice particles. And to provide a method.

上記課題を解決すべく、本発明は、以下の構成を有する。括弧内の数字は、後述する図面中の符号であり、参考のために付している。
本発明の第１の態様は、生鮮品の冷蔵システムにおいて、所定の温度に設定可能でありかつ生鮮品（F）を収容するための冷蔵室（11）と、前記冷蔵室（11）の内部で雪状の氷粒（S）を生成するための雪状氷粒生成手段（22,23,12）と、を備えたことを特徴とする。 In order to solve the above problems, the present invention has the following configuration. The numbers in parentheses are reference numerals in the drawings described later, and are attached for reference.
According to a first aspect of the present invention, in a refrigeration system for fresh products, a refrigeration chamber (11) that can be set to a predetermined temperature and accommodates fresh products (F), and an interior of the refrigeration chamber (11) And a snowy ice particle generating means (22, 23, 12) for generating snowy ice particles (S).

上記第１の態様において、前記雪状氷粒生成手段（22,23,12）は、水を０℃より高くかつ５℃以下の範囲の所定の温度に調節する水温調節装置（22）と、前記水温調節装置（22）により水温調節された水を加圧する加圧ポンプ（23）と、前記加圧ポンプ（23）により加圧された水を前記冷蔵室（11）の内部で噴霧する手段（12）と、を有することが、好適である。   In the first aspect, the snowy ice particle generating means (22, 23, 12) includes a water temperature adjusting device (22) for adjusting water to a predetermined temperature in a range higher than 0 ° C and lower than or equal to 5 ° C. A pressurizing pump (23) for pressurizing water whose water temperature is adjusted by the water temperature adjusting device (22), and means for spraying water pressurized by the pressurizing pump (23) inside the refrigerator compartment (11) It is preferable to have (12).

上記第１の態様において、前記冷蔵室（11）の気圧を減圧するための真空ポンプ（25）をさらに有することが、好適である。   In the first aspect, it is preferable to further include a vacuum pump (25) for reducing the pressure in the refrigerator compartment (11).

上記第１の態様において、前記水温調節装置（22）に供給する水に対して窒素ガスを注入する窒素ガス注入器（33）をさらに有することが、好適である。   In the first aspect, it is preferable to further include a nitrogen gas injector (33) for injecting nitrogen gas into the water supplied to the water temperature adjusting device (22).

本発明の第２の態様は、生鮮品の冷蔵方法において、−２℃〜−１５℃の範囲の所定の温度とされた冷蔵室（11）の内部に生鮮品（F）を搬入するステップと、前記冷蔵室（11）の内部で雪状の氷粒（S）を生成することにより前記生鮮品（F）を前記雪状の氷粒（S）で覆うステップと、を有することを特徴とする。   A second aspect of the present invention is a method for refrigeration of fresh products, wherein the fresh products (F) are carried into the refrigeration chamber (11) having a predetermined temperature in the range of -2 ° C to -15 ° C. Covering the fresh product (F) with the snow-like ice particles (S) by generating snow-like ice particles (S) inside the refrigerator compartment (11), To do.

上記第２の態様において、前記雪状の氷粒（S）は、０℃より高くかつ５℃以下の範囲の所定の温度に調節した水を加圧して前記冷蔵室（11）内で噴霧することにより生成することが、好適である。   In the second aspect, the snow-like ice particles (S) are sprayed in the refrigerator compartment (11) by pressurizing water adjusted to a predetermined temperature in a range higher than 0 ° C. and lower than 5 ° C. It is preferable to generate by.

上記第２の態様において、前記雪状の氷粒（S）を生成する前に前記冷蔵室（11）の気圧を減圧することが、好適である。   In the second aspect, it is preferable to reduce the pressure in the refrigerating chamber (11) before generating the snow-like ice particles (S).

上記第２の態様において、温度を調節される前の前記水に対して窒素ガスを注入することが、好適である。   In the second aspect, it is preferable to inject nitrogen gas into the water before the temperature is adjusted.

上記第２の態様において、前記雪状の氷粒（S）で覆った後に前記冷蔵室（11）を−１５℃〜−２０℃の範囲の所定の温度に冷却して前記生鮮品（F）を保存するステップをさらに有することが、好適である。   In the said 2nd aspect, after covering with the said snow-like ice particle (S), the said refrigerator compartment (11) is cooled to the predetermined temperature of the range of -15 degreeC--20 degreeC, and the said fresh produce (F) It is preferable that the method further includes a step of storing.

本発明による生鮮品の冷蔵システム及び冷蔵方法では、冷蔵室内で雪状の氷粒を生成することにより、対象の生鮮品の表面を雪状の氷粒で覆うものである。雪状の氷粒は、生鮮品の細かな凹凸の内部まで入り込み、生鮮品全体を満遍なく覆うことができる。この結果、生鮮品は効率よく冷却され保存される。これにより、生鮮品の冷凍油焼けなどの劣化を防止できる。また、解凍時における魚肉等の生鮮品の崩れを防止できる。生鮮品の鮮度、風味、香りなどを保存することができる。   In the fresh product refrigeration system and refrigeration method according to the present invention, the surface of the target fresh product is covered with snow-like ice particles by generating snow-like ice particles in the refrigerator compartment. Snow-like ice particles can penetrate into the fine irregularities of the fresh product and cover the entire fresh product evenly. As a result, the fresh product is efficiently cooled and stored. As a result, it is possible to prevent deterioration of fresh products such as burnt frozen oil. Moreover, collapse of fresh products such as fish meat during thawing can be prevented. The freshness, flavor, fragrance, etc. of fresh products can be preserved.

冷蔵室の気圧を予め減圧することにより、雪状の氷粒を生成し易くすることができる。   By reducing the pressure in the refrigerator compartment in advance, it is possible to easily generate snow-like ice particles.

雪状の氷粒の原料となる水に窒素ガスを注入することにより、水の酸素溶存量が低下することから、酸素による生鮮品の酸化、劣化を低減することができる。   By injecting nitrogen gas into water, which is a raw material for snow-like ice particles, the amount of dissolved oxygen in the water is reduced, so that the oxidation and deterioration of fresh products due to oxygen can be reduced.

生成した雪状の氷粒により冷蔵室内が冷却されるので、冷蔵室を冷却する冷凍機の負担を低減することができ、省エネルギーなシステムとなる。   Since the cold storage room is cooled by the generated snowy ice particles, the burden on the refrigerator that cools the cold storage room can be reduced, resulting in an energy saving system.

図１は、本発明による生鮮品の冷蔵システムの実施形態の一例の全体構成を示す図である。FIG. 1 is a diagram showing an overall configuration of an example of an embodiment of a fresh product refrigeration system according to the present invention. 図２は、図１の生鮮品の冷蔵システムの変形例を示す図である。FIG. 2 is a diagram showing a modification of the fresh product refrigeration system of FIG. 図３は、本発明による生鮮品の冷蔵方法の工程の一例を示すフロー図である。FIG. 3 is a flowchart showing an example of the steps of the method for refrigeration of fresh products according to the present invention. 図４は、本発明による生鮮品の冷蔵方法の工程の別の例を示すフロー図である。FIG. 4 is a flowchart showing another example of the process of the method for refrigeration of fresh products according to the present invention. 図５は、本発明による生鮮品の冷蔵方法の工程のさらに別の例を示すフロー図である。FIG. 5 is a flowchart showing still another example of the process of the method for refrigeration of fresh products according to the present invention.

以下、図面を参照しつつ本発明の実施形態を説明する。
図１は、本発明による生鮮品の冷蔵システムの実施形態の一例の全体構成を示す図である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an overall configuration of an example of an embodiment of a fresh product refrigeration system according to the present invention.

冷蔵室１１は、魚介類等の生鮮品を収容するための閉鎖空間を備えている。気密性を保持できる閉鎖空間の温度は、外部に設置された冷凍機２４により所定の温度に設定可能である。生鮮品の搬入に先立って、冷蔵室１１を−２℃〜−１５℃の範囲、好適には−５℃〜−１０℃の範囲の所定の温度に設定しておくことが好ましい。また、閉鎖空間の気圧を減圧する場合には、外部に設置された真空ポンプ２５により所定の圧力まで真空引きすることができる。減圧時の圧力は、０．００１ＭＰａ〜０．０１ＭＰａの範囲の所定の圧力とする。例えば０．００５ＭＰａ程度とする。減圧状態から常圧に戻したり、閉鎖空間の圧力が高まったときに排気したりするためのバルブ（図示せず）も備えている。   The refrigerator compartment 11 is provided with a closed space for storing fresh products such as seafood. The temperature of the closed space capable of maintaining airtightness can be set to a predetermined temperature by the refrigerator 24 installed outside. Prior to the delivery of fresh products, it is preferable to set the refrigerator compartment 11 at a predetermined temperature in the range of −2 ° C. to −15 ° C., preferably in the range of −5 ° C. to −10 ° C. Further, when reducing the pressure in the closed space, the vacuum can be evacuated to a predetermined pressure by the vacuum pump 25 installed outside. The pressure at the time of pressure reduction shall be a predetermined pressure in the range of 0.001 MPa to 0.01 MPa. For example, about 0.005 MPa. A valve (not shown) is also provided for returning from a reduced pressure state to normal pressure or exhausting when the pressure in the closed space increases.

冷蔵室１１の天井近傍にノズル１２が設置されている。図示の例では、１本の直線状の送管の下面に所定の間隔で複数のノズル孔が１２ａが設けられている。このノズル１２は、冷蔵室１１の内部で雪状の氷粒Ｓを生成するためのものである。ノズル１２の形状は、図示のものに限られず、例えば、複数本の送管を平行に設けてもよい。または、シャワーヘッド状としてもよい。   A nozzle 12 is installed near the ceiling of the refrigerator compartment 11. In the illustrated example, a plurality of nozzle holes 12a are provided at predetermined intervals on the lower surface of a single straight pipe. The nozzle 12 is for generating snow-like ice particles S inside the refrigerator compartment 11. The shape of the nozzle 12 is not limited to that shown in the figure. For example, a plurality of pipes may be provided in parallel. Alternatively, a shower head shape may be used.

冷蔵室１１の床上には、適宜、棚１３が配置されている。棚１３は、生鮮品Ｆを配列するためのものである。生鮮品Ｆは、１つ１つ重ならないように配列することが好ましい。冷蔵室１１の外部で生鮮品Ｆを棚１３上に配列した後、棚１３を冷蔵室１１に搬入してもよい。棚１３は、上方から下降してくる雪状の氷粒Ｓが、全ての生鮮品Ｆの周囲に到達できるような形状とすることが好ましい。例えば、棚板を、柵状、格子状又は網状とし、それらの棚板の隙間を通って雪状の氷粒Ｓが最下部まで降下できるようにする。   A shelf 13 is appropriately arranged on the floor of the refrigerator compartment 11. The shelf 13 is for arranging the fresh products F. The fresh products F are preferably arranged so that they do not overlap one by one. After arranging the fresh products F on the shelf 13 outside the refrigerator compartment 11, the shelf 13 may be carried into the refrigerator compartment 11. It is preferable that the shelf 13 has a shape such that snow-like ice particles S descending from above can reach around all the fresh products F. For example, the shelf plate is formed in a fence shape, a lattice shape, or a net shape, and the snow-like ice particles S can be lowered to the lowest portion through the gap between the shelf plates.

さらに、冷蔵室１１の外部には、貯水槽２１と、水温調節装置２２と、加圧ポンプ２３が設置されている。貯水槽２１は、雪状の氷粒の原料となる水を貯めておくタンクである。原料となる水は、水道水でも天然水でもよい。貯水槽２１と水温調節装置２２の間でポンプＰ１により水を循環させる。水温調節装置２２は、貯水槽２１の水を０℃より高くかつ５℃以下の範囲の所定の温度に調節する。好適には、３℃程度の温度に調節する。通常は、水温調節装置２２は冷却器である。元々この程度の温度の水を使用する場合は、水温調節装置２２が不要となることもある。   Further, a water storage tank 21, a water temperature adjusting device 22, and a pressurizing pump 23 are installed outside the refrigerator compartment 11. The water storage tank 21 is a tank for storing water as a raw material for snow-like ice particles. The raw water may be tap water or natural water. Water is circulated between the water storage tank 21 and the water temperature adjusting device 22 by the pump P1. The water temperature adjusting device 22 adjusts the water in the water storage tank 21 to a predetermined temperature in a range higher than 0 ° C. and lower than 5 ° C. Preferably, the temperature is adjusted to about 3 ° C. Normally, the water temperature adjusting device 22 is a cooler. When water having such a temperature is originally used, the water temperature adjusting device 22 may be unnecessary.

加圧ポンプ２３は、水温調節された水を加圧するためのものである。圧力は、０．１３ＭＰａ〜０．１７Ｍｐａの範囲の所定の値とする。例えば０．１５ＭＰａ程度とする。加圧された水はノズル１２に送られ、ノズル孔１２ａから霧状に噴出される。   The pressurizing pump 23 is for pressurizing water whose water temperature is adjusted. The pressure is set to a predetermined value in the range of 0.13 MPa to 0.17 MPa. For example, it is about 0.15 MPa. The pressurized water is sent to the nozzle 12 and ejected in a mist form from the nozzle hole 12a.

ノズル孔１２ａから、−２℃〜−１５℃の範囲内の所定の温度である冷蔵室１１内の空間に噴霧された高圧の水は、瞬時に気化し、その際の断熱膨張により冷却されて空中で氷結し、雪のような微細な氷粒を生成する。真空ポンプ２５により冷蔵室１１内を減圧することにより、水の気化が促進され断熱膨張が加速されるため、さらに効率的に雪状の氷粒を生成することができる。なお、生成される雪状の氷粒は、さらさらとした粉末状の粉雪と同程度の大きさである。ここでは、雪状の氷粒が、自然の雪と同様の結晶構造を有しているか否かは問題としない。   The high-pressure water sprayed from the nozzle hole 12a to the space in the refrigerator compartment 11 having a predetermined temperature in the range of −2 ° C. to −15 ° C. is instantly vaporized and cooled by adiabatic expansion at that time. Freezes in the air, producing fine ice particles like snow. By depressurizing the inside of the refrigerator compartment 11 by the vacuum pump 25, the vaporization of water is promoted and the adiabatic expansion is accelerated. Therefore, snow-like ice particles can be generated more efficiently. The generated snow-like ice particles are about the same size as the dry powder snow. Here, it does not matter whether the snow-like ice particles have the same crystal structure as that of natural snow.

通常、冷蔵室１１には、冷凍機２４からの冷気のファンなどによる空気の流れがあり、その空気の流れによって雪状の氷粒は舞うように拡散しながら、降下する。そして、雪状の氷粒は生鮮品の表面全体を覆うように付着する。雪状の氷粒は微細であるので、生鮮品の細かい凹凸の内部まで入り込み付着する。   Usually, in the refrigerator compartment 11, there is a flow of air by a cool air fan or the like from the refrigerator 24, and snow-like ice particles descend while diffusing so as to dance. The snow-like ice particles adhere to cover the entire surface of the fresh product. Since snow-like ice particles are fine, they penetrate into and adhere to the fine irregularities of fresh products.

図２は、図１の生鮮品の冷蔵システムの変形例を示す図である。図２では、図１の貯水槽２１の前段に設けるシステムのみを図示している。図２のシステムは、貯水槽２１内の水に窒素ガスを注入するためのものである。   FIG. 2 is a diagram showing a modification of the fresh product refrigeration system of FIG. In FIG. 2, only the system provided in the front | former stage of the water storage tank 21 of FIG. 1 is shown in figure. The system of FIG. 2 is for injecting nitrogen gas into the water in the water storage tank 21.

エアコンプレッサー１０は、大気を圧縮して窒素ガス抽出器３２に送るエアコンプレッサー（例えば株式会社日立産機システム製のオイルフリーベビコン（登録商標））である。供給エア圧力が０．５ＭＰａ〜０．９ＭＰａのものを用いる。   The air compressor 10 is an air compressor (for example, Oil Free Babycon (registered trademark) manufactured by Hitachi Industrial Equipment Systems Co., Ltd.) that compresses the atmosphere and sends it to the nitrogen gas extractor 32. A supply air pressure of 0.5 MPa to 0.9 MPa is used.

窒素ガス抽出器３２は、ポリイミド中空糸膜からなる窒素分離膜を設けた圧力容器の一端に圧縮空気を取り込み、横の口から酸素Ｏ２をパージ（排出）し、圧力容器の他端から窒素ガスを送出する脱気装置である。気体の種類により膜の透過速度が異なることを利用したものである。この脱気装置は、窒素ガス抽出器３２と窒素ガス注入器３３とを一体的に構成した装置として提供されている（例えば株式会社片山化学工業研究所製の脱気装置「リプレル」（登録商標））。 The nitrogen gas extractor 32 takes compressed air into one end of a pressure vessel provided with a nitrogen separation membrane made of a polyimide hollow fiber membrane, purges (discharges) oxygen O 2 from a side port, and nitrogen from the other end of the pressure vessel. It is a deaeration device that delivers gas. This utilizes the fact that the permeation rate of the membrane differs depending on the type of gas. This degassing device is provided as a device in which a nitrogen gas extractor 32 and a nitrogen gas injector 33 are integrally formed (for example, a degassing device “Riprel” (registered trademark) manufactured by Katayama Chemical Industry Laboratory Co., Ltd.). )).

窒素ガス注入器３３と貯水槽２１の間でポンプＰ２により水を循環させる。窒素ガス注入器３３は、例えば、１時間当たり２ｍ３の水を通過させ、１リットルあたり１．０ｍｇの溶存酸素量まで酸素を追い出す能力を有する。 Water is circulated between the nitrogen gas injector 33 and the water storage tank 21 by the pump P2. The nitrogen gas injector 33 has, for example, the ability to pass 2 m 3 of water per hour and expel oxygen to an amount of dissolved oxygen of 1.0 mg per liter.

図２のシステムを付加することにより、溶存酸素量の少ない水を用いて雪状の氷粒を生成することができる。これにより、生鮮品の状態をより良好に保持することが可能となる。   By adding the system of FIG. 2, it is possible to generate snow-like ice particles using water with a small amount of dissolved oxygen. Thereby, it becomes possible to hold | maintain the state of a fresh product more favorably.

図３は、本発明による生鮮品の冷蔵方法の工程の一例を示すフロー図である。説明において、図１中の符号を参照する場合がある。
先ず、冷凍機２４を稼働させることにより冷蔵室１１を−２℃〜−１５℃の範囲、好適には−５℃〜−１０℃の範囲の所定の温度とする（ステップＳ１１）。次に、冷蔵室１１内に生鮮品Ｆを搬入する（ステップＳ１２）。搬入時に冷蔵室１１の温度が上昇した場合は、再び設定温度となるまで待つ。 FIG. 3 is a flowchart showing an example of the steps of the method for refrigeration of fresh products according to the present invention. In the description, reference numerals in FIG. 1 may be referred to.
First, by operating the refrigerator 24, the refrigerator compartment 11 is set to a predetermined temperature in the range of -2 ° C to -15 ° C, preferably in the range of -5 ° C to -10 ° C (step S11). Next, the fresh product F is carried into the refrigerator compartment 11 (step S12). When the temperature of the refrigerator compartment 11 rises at the time of carrying in, it waits until it becomes set temperature again.

続いて、０℃より高く５℃以下の範囲の所定の温度（例えば３℃）に調節した水を、０．１３ＭＰａ〜０．１７Ｍｐａの範囲の所定の値（例えば０．１５ＭＰａ）に加圧し、冷蔵室１１のノズル孔１２ａから噴霧する。これにより、雪状の氷粒が生成する。生鮮品Ｆは、雪状の氷粒で覆われる（ステップＳ１３）。   Subsequently, water adjusted to a predetermined temperature (for example, 3 ° C.) in a range higher than 0 ° C. and lower than or equal to 5 ° C. is pressurized to a predetermined value (for example, 0.15 MPa) in a range of 0.13 MPa to 0.17 MPa, It sprays from the nozzle hole 12a of the refrigerator compartment 11. Thereby, snow-like ice particles are generated. The fresh product F is covered with snow-like ice particles (step S13).

その後のステップは２通りのいずれでもよい。１つは、冷蔵室１１内でそのまま生鮮品Ｆを保存する場合である。その場合、冷蔵室１１の設定温度を−１５℃〜−２０℃の範囲の所定の温度とし、生鮮品Ｆを保存する（ステップＳ１４）。もう１つは、冷蔵室１１では雪状の氷粒による被覆処理のみを行い、別の保管場所で生鮮品Ｆを保存する場合である。その場合、冷蔵室１１から生鮮品ステップＳ１４を搬出し（極力、温度上昇を避ける）、−１５℃〜−２０℃の範囲の所定の温度に設定した別の冷蔵室に搬入し、保存する（ステップＳ１５）。   The subsequent steps may be any of two ways. One is a case where the fresh product F is stored in the refrigerator compartment 11 as it is. In that case, the set temperature of the refrigerator compartment 11 is set to a predetermined temperature in the range of −15 ° C. to −20 ° C., and the fresh product F is stored (step S14). The other is a case where the refrigerator compartment 11 performs only the covering process with snow-like ice particles and preserves the fresh product F in another storage location. In that case, fresh product step S14 is carried out from the refrigerator compartment 11 (a temperature rise is avoided as much as possible), carried into another refrigerator compartment set to a predetermined temperature in the range of −15 ° C. to −20 ° C., and stored ( Step S15).

図４は、本発明による生鮮品の冷蔵方法の工程の別の例を示すフロー図である。
ステップＳ２１及びＳ２２は、図３の工程のステップＳ１１及びＳ１２と同じである。図４の工程では、生鮮品Ｆを搬入した後、真空ポンプ２５を用いて冷蔵室１１の気圧を０．００１ＭＰａから０．０１ＭＰａの範囲の所定の圧力（例えば０．００５ＭＰａ）に減圧する（ステップＳ２３）。その後のステップＳ２４は、図３の工程のステップＳ１３と同じである。さらにその後のステップＳ２５又はＳ２６は、図３の工程のステップＳ１４又はＳ１５と同じである。 FIG. 4 is a flowchart showing another example of the process of the method for refrigeration of fresh products according to the present invention.
Steps S21 and S22 are the same as steps S11 and S12 in the process of FIG. In the process of FIG. 4, after the fresh product F is carried in, the pressure in the refrigerator compartment 11 is reduced to a predetermined pressure (for example, 0.005 MPa) in the range of 0.001 MPa to 0.01 MPa using the vacuum pump 25 (step 5). S23). Subsequent step S24 is the same as step S13 of the process of FIG. Further, subsequent step S25 or S26 is the same as step S14 or S15 of the process of FIG.

図５は、本発明による生鮮品の冷蔵方法の工程のさらに別の例を示すフロー図である。
ステップＳ３１、Ｓ３２及びＳ３３は、図４の工程のステップＳ２１、Ｓ２２及びＳ２３と同じである。図４の工程では、貯水槽２１の水に窒素ガスを注入する処理を行う（ステップＳ３４）。但し、ステップＳ３４は、冷蔵室１１におけるステップＳ３１〜Ｓ３３の処理と並行して行うことができる。その後のステップＳ３５は、図４の工程のステップＳ２４と同じである。さらにその後のステップＳ３６又はＳ３７は、図４の工程のステップＳ２５又はＳ２６と同じである。 FIG. 5 is a flowchart showing still another example of the process of the method for refrigeration of fresh products according to the present invention.
Steps S31, S32 and S33 are the same as steps S21, S22 and S23 in the process of FIG. In the process of FIG. 4, the process which inject | pours nitrogen gas into the water of the water storage tank 21 is performed (step S34). However, step S34 can be performed in parallel with the processing of steps S31 to S33 in the refrigerator compartment 11. Subsequent step S35 is the same as step S24 of the process of FIG. Further, subsequent step S36 or S37 is the same as step S25 or S26 of the process of FIG.

図示しないが、さらに別の工程として、図３の工程に図５のステップＳ３４の窒素ガス注入工程を組み合わせてもよい。   Although not shown, as another process, the nitrogen gas injection process of step S34 of FIG. 5 may be combined with the process of FIG.

１１ 冷蔵室
１２ ノズル
１２ａ ノズル孔
１３ 棚
２１ 貯水槽
２２ 冷却器
２３ 加圧ポンプ
２４ 冷凍機
２５ 真空ポンプ
３１ エアコンプレッサー
３２ 窒素ガス抽出器
３３ 窒素ガス注入器
Ｓ 雪状の氷粒
Ｆ 生鮮品 DESCRIPTION OF SYMBOLS 11 Refrigeration room 12 Nozzle 12a Nozzle hole 13 Shelf 21 Water tank 22 Cooler 23 Pressurization pump 24 Refrigerator 25 Vacuum pump 31 Air compressor 32 Nitrogen gas extractor 33 Nitrogen gas injector S Snowy ice grain F Fresh goods

Claims (9)

生鮮品の冷蔵システムにおいて、
所定の温度に設定可能でありかつ生鮮品（F）を収容するための冷蔵室（11）と、
前記冷蔵室（11）の内部で雪状の氷粒（S）を生成するための雪状氷粒生成手段（22,23,12）と、を備えたことを特徴とする
生鮮品の冷蔵システム。 In the refrigeration system for fresh products,
A refrigerating room (11) that can be set to a predetermined temperature and contains fresh food (F);
A fresh product refrigeration system comprising: snowy ice particle generating means (22, 23, 12) for generating snowy ice particles (S) inside the refrigerator compartment (11) . 前記雪状氷粒生成手段（22,23,12）は、水を０℃より高くかつ５℃以下の範囲の所定の温度に調節する水温調節装置（22）と、前記水温調節装置（22）により水温調節された水を加圧する加圧ポンプ（23）と、前記加圧ポンプ（23）により加圧された水を前記冷蔵室（11）の内部で噴霧する手段（12）と、を有することを特徴とする請求項１に記載の生鮮品の冷蔵システム。   The snowy ice particle generating means (22, 23, 12) includes a water temperature adjusting device (22) for adjusting water to a predetermined temperature in a range higher than 0 ° C. and not higher than 5 ° C., and the water temperature adjusting device (22). A pressurizing pump (23) for pressurizing water whose water temperature has been adjusted by means, and means (12) for spraying water pressurized by the pressurizing pump (23) inside the refrigerator compartment (11) The refrigeration system for fresh products according to claim 1. 前記冷蔵室（11）の気圧を減圧するための真空ポンプ（25）をさらに有することを特徴とする請求項１又は２に記載の生鮮品の冷蔵システム。   The fresh product refrigeration system according to claim 1 or 2, further comprising a vacuum pump (25) for reducing the pressure in the refrigeration chamber (11). 前記水温調節装置（22）に供給する水に対して窒素ガスを注入する窒素ガス注入器（33）をさらに有することを特徴とする請求項１〜３のいずれかに記載の生鮮品の冷蔵システム。   The fresh product refrigeration system according to any one of claims 1 to 3, further comprising a nitrogen gas injector (33) for injecting nitrogen gas into water supplied to the water temperature adjusting device (22). . 生鮮品の冷蔵方法において、
−２℃〜−１５℃の範囲の所定の温度とされた冷蔵室（11）の内部に生鮮品（F）を搬入するステップと、
前記冷蔵室（11）の内部で雪状の氷粒（S）を生成することにより前記生鮮品（F）を前記雪状の氷粒（S）で覆うステップと、を有することを特徴とする
生鮮品の冷蔵方法。 In the method of refrigeration of fresh products,
Carrying the fresh product (F) into the refrigerator compartment (11) set at a predetermined temperature in the range of -2 ° C to -15 ° C;
Covering the fresh product (F) with the snow-like ice particles (S) by generating snow-like ice particles (S) inside the refrigerator compartment (11). How to refrigerate fresh products. 前記雪状の氷粒（S）は、０℃より高くかつ５℃以下の範囲の所定の温度に調節した水を加圧して前記冷蔵室（11）内で噴霧することにより生成することを特徴とする請求項５に記載の生鮮品の冷蔵方法。   The snow-like ice particles (S) are generated by pressurizing water adjusted to a predetermined temperature in a range higher than 0 ° C. and lower than 5 ° C. and spraying the water in the refrigerator compartment (11). The method for refrigeration of fresh products according to claim 5. 前記雪状の氷粒（S）を生成する前に前記冷蔵室（11）の気圧を減圧することを特徴とする請求項５又は６に記載の生鮮品の冷蔵方法。   The fresh product refrigeration method according to claim 5 or 6, wherein the pressure in the refrigerating chamber (11) is reduced before the snow-like ice particles (S) are generated. 温度を調節される前の前記水に対して窒素ガスを注入することを特徴とする請求項５〜７のいずれかに記載の生鮮品の冷蔵方法。   Nitrogen gas is inject | poured with respect to the said water before temperature is adjusted, The refrigeration method of the fresh goods in any one of Claims 5-7 characterized by the above-mentioned. 前記雪状の氷粒（S）で覆った後に前記冷蔵室（11）を−１５℃〜−２０℃の範囲の所定の温度に冷却して前記生鮮品（F）を保存するステップをさらに有することを特徴とする請求項５〜８のいずれかに記載の生鮮品の冷蔵方法。   The method further comprises the step of storing the fresh product (F) by cooling the refrigerator compartment (11) to a predetermined temperature in the range of −15 ° C. to −20 ° C. after being covered with the snow-like ice particles (S). The method for refrigeration of fresh products according to any one of claims 5 to 8.
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