JPH07102035B2 - Storage device - Google Patents
Storage deviceInfo
- Publication number
- JPH07102035B2 JPH07102035B2 JP33894490A JP33894490A JPH07102035B2 JP H07102035 B2 JPH07102035 B2 JP H07102035B2 JP 33894490 A JP33894490 A JP 33894490A JP 33894490 A JP33894490 A JP 33894490A JP H07102035 B2 JPH07102035 B2 JP H07102035B2
- Authority
- JP
- Japan
- Prior art keywords
- storage
- gas
- pressure
- valve
- gas supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000463 material Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 113
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 30
- 235000012055 fruits and vegetables Nutrition 0.000 description 26
- 229910052757 nitrogen Inorganic materials 0.000 description 13
- 238000001179 sorption measurement Methods 0.000 description 11
- 238000000926 separation method Methods 0.000 description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 238000000605 extraction Methods 0.000 description 5
- 230000007774 longterm Effects 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000003795 desorption Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- 230000003584 silencer Effects 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 238000004320 controlled atmosphere Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
Landscapes
- Storage Of Harvested Produce (AREA)
- Warehouses Or Storage Devices (AREA)
- Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
- Storage Of Fruits Or Vegetables (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は貯蔵装置に係り、特に貯蔵庫内に貯蔵物の鮮度
維持を図るガスを充填する貯蔵装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage device, and more particularly to a storage device that fills a storage with a gas for maintaining freshness of the stored product.
従来の技術 例えば野菜、果物等の生鮮食料品は、一般に出荷までの
間、貯蔵装置内に貯蔵され鮮度の維持が図られている。
また、これら貯蔵物の長期保存には、貯蔵庫内を貯蔵物
が凍結しない程度に低温として不活性化すると共に、庫
内雰囲気の酸素濃度を必要最小限に低下させ、さらに窒
素あるいは二酸化炭素与えて呼吸作用を制御させるのが
最良手段とされており、昨年この種の研究が続けられて
いる。この現象を利用した貯蔵方法は、CA（雰囲気制御
またはコントロールド・アトモスフィア）貯蔵法と呼ば
れている。2. Description of the Related Art Fresh food products such as vegetables and fruits are generally stored in a storage device to maintain their freshness until shipment.
In addition, for long-term storage of these stored items, inactivate the inside of the storage at a temperature low enough not to freeze the stored contents, reduce the oxygen concentration in the storage atmosphere to the necessary minimum, and further give nitrogen or carbon dioxide. Controlling the effects of breathing is considered to be the best approach, and this type of research has been ongoing last year. A storage method utilizing this phenomenon is called a CA (Atmosphere Controlled or Controlled Atmosphere) storage method.
このCA貯蔵法を用いた貯蔵装置は、青果物等を貯蔵する
貯蔵庫と、青果物等を貯蔵するのに最適な環境、即ち庫
内の雰囲気ガスを所定濃度割合（例えば、酸素（O2）２
〜３％、二酸化炭素（CO2）５％のガス）に調整するガ
ス生成装置とから構成されている。この種の貯蔵装置で
は、当初青果物等を貯蔵庫に搬入した後、貯蔵庫とガス
生成装置とを接続する配管に設けられたガス供給弁を開
弁するとともに貯蔵庫の排気配管に設けられた排気弁を
開弁して上記最適なガスを貯蔵庫内へ供給し、貯蔵庫内
の空気を最適なガスと置換する。A storage device using this CA storage method is a storage for storing fruits and vegetables, and an optimal environment for storing fruits and vegetables, that is, atmosphere gas in the storage at a predetermined concentration ratio (for example, oxygen (O 2 ) 2
˜3%, carbon dioxide (CO 2 ) gas 5%). In this type of storage device, after the fruits and vegetables are initially carried into the storage, the gas supply valve provided in the pipe connecting the storage and the gas generator is opened and the exhaust valve provided in the exhaust pipe of the storage is opened. The valve is opened to supply the optimum gas into the storage, and the air in the storage is replaced with the optimum gas.
そして、所定時間経過後、貯蔵庫内の空気ガス生成装置
からのガスに置換されると、上記ガス供給弁及び排気弁
を閉弁する。Then, after a lapse of a predetermined time, when the gas from the air gas generator in the storage is replaced, the gas supply valve and the exhaust valve are closed.
このようにして、貯蔵庫内に貯蔵された青果物は呼吸す
るため、庫内の酸素ガスを消費しながら二酸化炭素（CO
2ガス）を発生する。従って、経時とともに庫内のガス
濃度割合は、その青果物の最適ガス条件の上、下限値を
越えてしまい、そのままにしておくと青果物はガス障害
により鮮度が劣化してしまう。In this way, the fruits and vegetables stored in the store breathe, so while consuming oxygen gas in the store, carbon dioxide (CO
2 gas) is generated. Therefore, with time, the gas concentration ratio in the refrigerator exceeds the lower limit value under the optimum gas conditions for the fruits and vegetables, and if left as it is, the freshness of the fruits and vegetables deteriorates due to gas damage.
そのため、貯蔵装置では庫内のガス濃度割合が上、下限
値を越えると上記ガス供給弁及び排気弁を開弁してガス
生成装置により生成された最適ガスを庫内に供給してガ
ス置換を行い最適ガス条件となるようにガス濃度割合を
修整する。Therefore, in the storage device, when the gas concentration ratio in the storage exceeds the upper and lower limit values, the gas supply valve and the exhaust valve are opened to supply the optimum gas generated by the gas generator into the storage to perform gas replacement. Adjust the gas concentration ratio so that the optimum gas condition is achieved.
発明が解決しようとする課題 しかるに、従来の貯蔵装置においては、上記のように庫
内にガスを供給する際、ガス供給弁及び排気弁を同時に
開弁させて庫内のガス置換を行うようになっており、庫
内のガス置換が終了したときもガス供給弁及び排気弁を
同時に閉弁させていた。ところが、ガス供給弁を介して
貯蔵庫に供給されるガスは加圧されているため、庫内の
ガス置換を行うとき庫内全体が加圧状態になる。そのた
め、ガス供給弁及び排気弁を同時に閉弁させてしまう
と、ガス置換終了後も庫内が加圧されたままとなり、庫
内に貯蔵された青果物は加圧された雰囲気ガス中で保存
されることになる。従って、従来は青果物が加圧状態で
長期間保存されるといたみがはげしくなり品質の低下を
招くおそれがあるといった課題がある。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the conventional storage device, when the gas is supplied to the inside of the storage space as described above, the gas supply valve and the exhaust valve are simultaneously opened to replace the gas inside the storage space. Therefore, the gas supply valve and the exhaust valve were closed at the same time even when the gas replacement in the refrigerator was completed. However, since the gas supplied to the storage via the gas supply valve is pressurized, when the gas inside the storage is replaced, the entire storage is in a pressurized state. Therefore, if the gas supply valve and the exhaust valve are closed at the same time, the inside of the refrigerator remains pressurized even after the gas replacement is completed, and the fruits and vegetables stored in the refrigerator are stored in the pressurized atmosphere gas. Will be. Therefore, conventionally, there is a problem that if fruits and vegetables are stored under pressure for a long period of time, they may become unpleasant and the quality may deteriorate.
そこで、本発明は貯蔵庫内に圧力が残らないようにして
上記課題を解決した貯蔵装置を提供することを目的とす
る。Therefore, an object of the present invention is to provide a storage device that solves the above problems by preventing pressure from remaining in the storage.
課題を解決するための手段 本発明は、貯蔵物が貯蔵された貯蔵庫と、該貯蔵庫に所
定濃度の気体を供給する気体供給源と、該貯蔵庫と該気
体供給源とを連通する給気配管に設けられた気体供給弁
と、該貯蔵庫と外部とを連通する排出配管に設けられた
排気弁とを有し、該気体供給弁及び排気弁の開弁により
該貯蔵庫内の気体を気体供給源からの気体に置換する貯
蔵装置において、 前記貯蔵庫内の気体の置換が終了したとき前記気体供給
弁を閉弁し、その後も前記排気弁の開弁を継続し、前記
貯蔵庫内の圧力が略大気圧になったとき前記排気弁を閉
弁させる圧力調整手段を具備してなることを特徴とする
ものである。Means for Solving the Problems The present invention relates to a storage in which a stored material is stored, a gas supply source for supplying a gas having a predetermined concentration to the storage, and an air supply pipe connecting the storage and the gas supply source. It has a gas supply valve provided and an exhaust valve provided in a discharge pipe that communicates the storage with the outside, and the gas in the storage is opened from the gas supply source by opening the gas supply valve and the exhaust valve. In the storage device for replacing the gas in the storage, the gas supply valve is closed when the replacement of the gas in the storage is completed, and then the opening of the exhaust valve is continued, and the pressure in the storage is substantially atmospheric pressure. It is characterized by comprising pressure adjusting means for closing the exhaust valve when the above condition occurs.
作用 本発明によれば、気体供給弁が閉弁した後も排気弁の開
弁を継続し、前記貯蔵庫内の圧力が略大気圧になったと
き排気弁を閉弁させるため、貯蔵庫内の気体の置換が終
了した後、貯蔵庫の圧力を略大気圧となるように調整す
ることができる。そのため、庫内を例えば青果物等の貯
蔵物を長期間保存するのに適した最適なガス濃度割合に
制御できるとともに、成果物が貯蔵された貯蔵庫内の圧
力を減圧して青果物がいたまない圧力に調整することが
可能になる。Effect According to the present invention, the exhaust valve is continuously opened even after the gas supply valve is closed, and the exhaust valve is closed when the pressure in the storage becomes substantially atmospheric pressure. After the replacement is completed, the pressure in the storage can be adjusted to be substantially atmospheric pressure. Therefore, the inside of the storage can be controlled to an optimal gas concentration ratio suitable for long-term storage of stored products such as fruits and vegetables, and the pressure in the storage where the deliverables are stored is reduced to a pressure that is not enough for fruits and vegetables. Can be adjusted to.
実施例 第１図及び第３図に本発明の一実施例である貯蔵装置を
示す。各図中、貯蔵装置１は大略すると、貯蔵庫2,気体
分離ユニット3,圧縮ユニット4,及び制御回路７等により
構成されている。Embodiment FIG. 1 and FIG. 3 show a storage device according to an embodiment of the present invention. In each figure, the storage device 1 is roughly composed of a storage cabinet 2, a gas separation unit 3, a compression unit 4, a control circuit 7, and the like.
貯蔵庫２には、庫内のガス濃度割合を検出するO2センサ
5,CO2センサ６が設けられ、且つ気体分離ユニット３と
接続された窒素供給配管８（以下、N2配管という）及
び、排出配管10の一端が接続される。The storage 2 has an O 2 sensor for detecting the gas concentration ratio in the storage.
5, a CO 2 sensor 6 is provided, and a nitrogen supply pipe 8 (hereinafter referred to as N 2 pipe) connected to the gas separation unit 3 and one end of a discharge pipe 10 are connected.
上記N2配管８には電磁弁よりなるガス供給弁8aが、排出
配管10には電磁弁よりなる排気弁11が夫々配設されてい
る。また、N2配管８は貯蔵庫２の比較的上部位置に接続
されており、一方、排出配管10は貯蔵庫２の下部位置に
接続位置を選定されている。気体分離ユニット３は、圧
縮ユニット４からの圧縮空気を供給されて、製品ガスた
る窒素を分離生成する装置である。The N 2 pipe 8 is provided with a gas supply valve 8a made of a solenoid valve, and the discharge pipe 10 is provided with an exhaust valve 11 made of a solenoid valve. Further, the N 2 pipe 8 is connected to a relatively upper position of the storage 2, while the discharge pipe 10 is connected to the lower position of the storage 2. The gas separation unit 3 is a device that is supplied with the compressed air from the compression unit 4 to separate and generate nitrogen as a product gas.
圧縮ユニット４は吸気配管14に吸気フィルタ付サイレン
サ15A,コンプレッサ15B,ドライヤ15Cを配設してなる。
圧縮ユニット４はコンプレッサ15Bの運転によりサイレ
ンサ15Aから吸い込んだ空気を圧縮し、ドライヤ15Cによ
り除湿された圧縮空気を供給配管16を介して気体分離ユ
ニット３に供給する。The compression unit 4 has a silencer 15A with an intake filter, a compressor 15B, and a dryer 15C arranged in an intake pipe 14.
The compression unit 4 compresses the air sucked from the silencer 15A by operating the compressor 15B, and supplies the compressed air dehumidified by the dryer 15C to the gas separation unit 3 via the supply pipe 16.
続いて気体分離ユニット３の構成について説明する。第
１図中、21,22は第1,第２の吸着槽で、各吸着槽21,22内
には夫々酸素を吸着する吸着剤としての分子ふるいカー
ボン21A,22A（第１図中、梨地で示す）が充填されてい
る。Next, the configuration of the gas separation unit 3 will be described. In FIG. 1, 21 and 22 are the first and second adsorption tanks, and the molecular sieving carbons 21A and 22A as adsorbents that adsorb oxygen in the respective adsorption tanks 21 and 22 (shown in FIG. (Indicated by) is filled.
23,24は着脱時に吸着槽21,22からの気体を排出する配管
で、夫々共通排出配管25に接続されており、排出配管25
は吸着されたガス（本実施例では吸着された酸素）を大
気中に排出するようになっている。そして、前記配管2
3,24の途中には夫々吸着槽21,22内の脱着ガスを半サイ
クル毎に交互に排出する電磁弁からなる気体排出切換弁
26,27が設けられている。23 and 24 are pipes for discharging the gas from the adsorption tanks 21 and 22 at the time of attachment / detachment, which are connected to the common discharge pipe 25, respectively.
Is adapted to discharge the adsorbed gas (adsorbed oxygen in this embodiment) to the atmosphere. And the pipe 2
In the middle of 3, 24, a gas discharge switching valve consisting of a solenoid valve that alternately discharges the desorption gas in the adsorption tanks 21, 22 every half cycle.
26,27 are provided.
一方、28,29は吸着槽21,22からの窒素を夫々取出す取出
配管、30は該各配管28,29と接続された取出配管で、各
配管28,29の途中には半サイクルの間だけ交互に開弁す
る電磁弁からなる還流取出用切換弁31,32が夫々設けら
れている。また前記取出配管30は生成される窒素ガスを
貯溜する窒素タンク33と接続されている。On the other hand, 28 and 29 are extraction pipes that take out nitrogen from the adsorption tanks 21 and 22, respectively, and 30 is an extraction pipe that is connected to the pipes 28 and 29. Recirculation extraction switching valves 31 and 32, which are electromagnetic valves that open alternately, are provided respectively. Further, the extraction pipe 30 is connected to a nitrogen tank 33 that stores the generated nitrogen gas.
また、還流取出用の切換弁31,32は吸着槽21,22内を昇圧
させるとき、空気供給用の切換弁34,35の開弁と略同時
に開弁され、窒素タンク33内の窒素ガスを吸着槽21,22
内に還流させる。尚、切換弁34,35は供給配管16と各吸
着槽21,22の間に配設されている。When the pressure in the adsorption tanks 21 and 22 is increased, the recirculation extraction switching valves 31 and 32 are opened at substantially the same time as the air supply switching valves 34 and 35 are opened, and the nitrogen gas in the nitrogen tank 33 is removed. Adsorption tank 21,22
Bring to reflux. The switching valves 34, 35 are arranged between the supply pipe 16 and the adsorption tanks 21, 22.
36は配管28,29間を連通する配管、37は配管36の途中に
設けられた電磁弁からなる均圧用切換弁で、均圧用切換
弁37は吸着槽21,22による半サイクルの終了時に所定の
短時間だけ開弁し、各吸着槽21,22間を均圧にする。36 is a pipe that connects between the pipes 28 and 29, 37 is a pressure equalizing switching valve consisting of a solenoid valve provided in the middle of the pipe 36, and the pressure equalizing switching valve 37 is set at the end of the half cycle by the adsorption tanks 21 and 22. The valve is opened for a short period of time to equalize the pressure between the adsorption tanks 21 and 22.
窒素タンク33には窒素タンク33の窒素ガスを貯蔵庫２に
供給するN2配管８が接続されており、N2配管８の途中に
は前記のようにガス供給弁8aが配設されている。The N 2 pipe 8 for supplying the nitrogen gas of the nitrogen tank 33 to the storage 2 is connected to the nitrogen tank 33, and the gas supply valve 8a is arranged in the middle of the N 2 pipe 8 as described above.
上記構成の気体分離ユニット３は、昇圧、均圧、脱着の
各工程を繰返し行ないN2ガスを生成する。尚、気体分離
ユニット３の詳細な動作説明はここでは省略する。The gas separation unit 3 having the above configuration repeats the steps of pressurization, pressure equalization, and desorption to generate N 2 gas. The detailed operation of the gas separation unit 3 will be omitted here.
上記ガス供給弁8a及び排気弁11は制御回路７に接続され
て通常閉弁しており、制御回路７から供給される駆動信
号により開弁動作する構成とされている。即ち、制御回
路７は第３図に示すようなシーケンス回路により構成さ
れており、貯蔵庫２内のガス濃度割合の変化に応じてガ
ス供給弁8a、排気弁11を開閉制御する。The gas supply valve 8a and the exhaust valve 11 are connected to the control circuit 7 and are normally closed, and are configured to be opened by a drive signal supplied from the control circuit 7. That is, the control circuit 7 is composed of a sequence circuit as shown in FIG. 3, and controls the opening and closing of the gas supply valve 8a and the exhaust valve 11 according to the change of the gas concentration ratio in the storage 2.
貯蔵庫２内に貯蔵された青果物は呼吸するため、庫内の
酸素（O2）を消費しながら二酸化炭素（O2）を発生す
る。従って、青果物を長期間保存する場合、経時ととも
に庫内のガス濃度割合は、CO2濃度が高まり青果物の最
適ガス条件の許容範囲を越えてしまう。Since the fruits and vegetables stored in the storage 2 breathe, carbon dioxide (O 2 ) is generated while consuming oxygen (O 2 ) in the storage. Therefore, when the fruits and vegetables are stored for a long period of time, the gas concentration ratio in the refrigerator increases with time and the CO 2 concentration increases, and exceeds the allowable range of the optimum gas conditions for the fruits and vegetables.
庫内のO2濃度,CO2濃度はO2センサ5,O2センサ６により監
視されており、制御回路７はO2センサ5,CO2センサ６の
検出信号により気体分離ユニット３で生成されたN2ガス
の供給を制御する。The O 2 concentration and the CO 2 concentration in the chamber are monitored by the O 2 sensor 5 and the O 2 sensor 6, and the control circuit 7 is generated in the gas separation unit 3 by the detection signals of the O 2 sensor 5 and the CO 2 sensor 6. Control the supply of N 2 gas.
ここで、第２図に示す制御回路７の制御動作について説
明する。第２図中、41はガス供給弁8aのソレノイドで、
42は排気弁11のソレノイドを表わす。又43,44はリレー
で夫々閉成したときソレノイド41,42を励磁する。45は
遅延リレー（圧力調整手段）で、後述するようにガス供
給弁8aが閉弁した後所定時間ｔ秒間排気弁11を開弁状態
に保持する。尚、遅延リレー45は入力信号がオフになっ
ても時間ｔの間オン状態を保持するようになっており、
この遅延時間（ｔ）は任意の時間に変更することができ
る。Here, the control operation of the control circuit 7 shown in FIG. 2 will be described. In FIG. 2, 41 is a solenoid of the gas supply valve 8a,
Reference numeral 42 represents a solenoid of the exhaust valve 11. Also, 43 and 44 energize the solenoids 41 and 42 when they are closed by relays, respectively. Reference numeral 45 denotes a delay relay (pressure adjusting means) which holds the exhaust valve 11 in the open state for a predetermined time t seconds after the gas supply valve 8a is closed, as will be described later. The delay relay 45 holds the ON state for the time t even when the input signal is turned OFF.
This delay time (t) can be changed to any time.
例えば、貯蔵庫２内に青果物等の貯蔵物が搬入された
後、庫内のガスは最適ガス雰囲気（O2が２〜３％,CO2が
５％）に調整される。その後、青果物等の呼吸作用によ
り庫内のガス濃度割合が変化すると、制御回路７は上記
最適ガス雰囲気を維持するようにガス供給弁8a,排気弁1
1を開閉制御する。For example, after the stored products such as fruits and vegetables are carried into the storage 2, the gas in the storage is adjusted to the optimum gas atmosphere (O 2 is 2 to 3%, CO 2 is 5%). After that, when the gas concentration ratio in the storage changes due to the breathing action of fruits and vegetables, the control circuit 7 controls the gas supply valve 8a and the exhaust valve 1 so as to maintain the optimum gas atmosphere.
Open / close control of 1.
従って、庫内のCO2濃度が最適ガスの許容上限値を越え
たとき、制御回路７のスイッチ46が閉成される。これに
より、リレー43が励磁されるとともにリレー43の各接点
43a〜43cが閉成する。Therefore, when the CO 2 concentration in the refrigerator exceeds the allowable upper limit value of the optimum gas, the switch 46 of the control circuit 7 is closed. As a result, the relay 43 is excited and each contact of the relay 43 is
43a-43c are closed.
リレー43の接点43aが閉成すると、ソレノイド41は励磁
され、ガス供給弁8aは開弁する。よって、気体分離ユニ
ット３の窒素タンク33に貯溜されたN2ガスはN2配管8,ガ
ス供給弁8aを介して貯蔵庫２内に供給される。尚、窒素
タンク33の製品ガスはN2ガス99〜99.9％,O2が１〜0.1％
程度の高純度のN2ガスである。そのため、窒素タンク33
からのN2ガスが貯蔵庫２内に供給されるにつれて貯蔵庫
２内の圧力が上昇するとともに庫内のCO2濃度が低下す
る。When the contact 43a of the relay 43 is closed, the solenoid 41 is excited and the gas supply valve 8a is opened. Therefore, the N 2 gas stored in the nitrogen tank 33 of the gas separation unit 3 is supplied into the storage 2 through the N 2 pipe 8 and the gas supply valve 8a. The product gas in the nitrogen tank 33 is N 2 gas 99 to 99.9% and O 2 is 1 to 0.1%.
It is a highly pure N 2 gas. Therefore, the nitrogen tank 33
As the N 2 gas from the inside of the storage 2 is supplied into the storage 2, the pressure inside the storage 2 rises and the concentration of CO 2 inside the storage 2 falls.
又、上記リレー43が励磁されると同時に遅延リレー45も
励磁され遅延リレー45の接点45aが閉成するため、リレ
ー44も励磁される。そのため、リレー44の接点44a,44b
が閉成してソレノイド42が励磁される。従って、上記ガ
ス供給弁8aの開弁と同時に排気弁11が開弁する。庫内は
窒素タンク33からのN2ガス供給により加圧状態となるた
め、排気弁11の開弁により庫内のガスは排出配管11を介
して外部に排出される。これにより、庫内のCO2濃度の
高いガスが外部に排出されて、庫内のCO2濃度は徐々に
低下する。Further, at the same time that the relay 43 is excited, the delay relay 45 is also excited and the contact 45a of the delay relay 45 is closed, so that the relay 44 is also excited. Therefore, the contacts 44a, 44b of the relay 44
Is closed and the solenoid 42 is excited. Therefore, the exhaust valve 11 opens simultaneously with the opening of the gas supply valve 8a. Since the inside of the storage is pressurized by supplying N 2 gas from the nitrogen tank 33, the gas inside the storage is discharged to the outside through the exhaust pipe 11 by opening the exhaust valve 11. As a result, the gas with a high CO 2 concentration inside the chamber is discharged to the outside, and the CO 2 concentration inside the chamber gradually decreases.
第３図に上記制御回路７の動作により、ガス供給弁8aが
及び排気弁11のソレノイド41,42に入力される信号及び
庫内の圧力変化のタイムチャートを示す。FIG. 3 shows a time chart of a signal input to the gas supply valve 8a and the solenoids 41 and 42 of the exhaust valve 11 and a pressure change in the refrigerator by the operation of the control circuit 7.
上記ガス供給弁７及び排気弁11の開弁により庫内のガス
が最適ガスになると、スイッチ46が開成される。これに
より、リレー43が消勢され、リレー43の各接点43a〜43c
が開弁する。そのため、ソレノイド41は消勢され、ガス
供給弁8aは閉弁する。When the gas in the refrigerator has become the optimum gas by opening the gas supply valve 7 and the exhaust valve 11, the switch 46 is opened. As a result, the relay 43 is deenergized, and the contacts 43a to 43c of the relay 43 are deactivated.
Opens. Therefore, the solenoid 41 is deenergized and the gas supply valve 8a is closed.
しかるに、排気弁11のソレノイド42は遅延リレー45によ
りガス供給弁8aが閉弁した後もリレー44が励磁された状
態に保持され、時間ｔの間開弁している。そのため、貯
蔵庫２内に残留したガスは、加圧されているが排気弁11
より外部に排出されて、庫内の圧力は略大気圧まで減圧
される。このような庫内の圧力は第３図中線図IIIに示
すように変化し、庫内が略大気圧になったとき排気弁11
は閉弁する。However, the solenoid 42 of the exhaust valve 11 is kept open by the delay relay 45 even after the gas supply valve 8a is closed, and is open for the time t. Therefore, although the gas remaining in the storage 2 is pressurized, the exhaust valve 11
It is further discharged to the outside, and the pressure in the refrigerator is reduced to about atmospheric pressure. Such a pressure in the storage chamber changes as shown in the middle line III of FIG. 3, and when the storage chamber becomes substantially atmospheric pressure, the exhaust valve 11
Closes.
このように、ガス供給弁8aが閉弁した後も排気弁11の開
弁を継続し、前記貯蔵庫内の圧力が略大気圧になったと
き排気弁11を閉弁させるため、貯蔵庫２内のガスの置換
が終了した後、所定時間ｔだけ遅れて排気弁11を閉弁さ
せる間に貯蔵庫２の圧力を略大気圧となるように調整す
ることができる。そのため、貯蔵庫２内は、例えば青果
物等の貯蔵物を長期間保存するのに適した最適なガス濃
度割合に制御されるとともに、青果物が貯蔵された貯蔵
庫２内の圧力を減圧して青果物がいたまない圧力に調整
される。従って、庫内に貯蔵された青果物等は長期間保
存されても庫内の圧力によりいたんでしまうことが防止
され、貯蔵物の品質低下が防止される。In this way, the exhaust valve 11 continues to be opened even after the gas supply valve 8a is closed, and the exhaust valve 11 is closed when the pressure in the storage reaches approximately atmospheric pressure. After the gas replacement is completed, the pressure of the storage 2 can be adjusted to be substantially atmospheric pressure while the exhaust valve 11 is closed with a delay of a predetermined time t. Therefore, the inside of the storage 2 is controlled to have an optimum gas concentration ratio suitable for long-term storage of stored products such as fruits and vegetables, and the pressure in the storage 2 in which the fruits and vegetables are stored is reduced to produce fruits and vegetables. The pressure is adjusted. Therefore, it is possible to prevent the fruits and vegetables stored in the storage from being damaged by the pressure in the storage even if they are stored for a long period of time, and it is possible to prevent the quality of the stored products from deteriorating.
第４図に本発明の変形例を示す。第４図中、排気配管10
には上、下流側の圧力差により自動的に開閉する圧力調
整手段及び排気弁としての圧力制御弁47が配設されてい
る。この圧力制御弁47は圧力検出部48がダイヤフラム49
により上流側のダイヤフラム室50と下流側のダイヤフラ
ム室51とに画成されている。ダイヤフラム49はバネ52の
押圧力により閉弁方向に附勢されている。FIG. 4 shows a modification of the present invention. In Fig. 4, exhaust pipe 10
In the upper part, a pressure control valve 47 as an exhaust valve and a pressure adjusting means that automatically opens and closes due to a pressure difference on the downstream side is arranged. In this pressure control valve 47, the pressure detector 48 has a diaphragm 49.
Is defined by an upstream side diaphragm chamber 50 and a downstream side diaphragm chamber 51. The diaphragm 49 is biased in the valve closing direction by the pressing force of the spring 52.
上流側のダイヤフラム室50は上流側の排出配管10より分
岐した分岐管53が接続され、下流側のダイヤフラム室51
には下流側の排出配管10より分岐した分岐管54が接続さ
れている。The upstream diaphragm chamber 50 is connected to a branch pipe 53 branched from the upstream exhaust pipe 10, and the downstream diaphragm chamber 51 is connected.
A branch pipe 54 branched from the discharge pipe 10 on the downstream side is connected to this.
尚、排出配管10の先端は大気開放となっているので、下
流側のダイヤフラム室51は略大気圧となっている。又、
上流側のダイヤフラム室50には貯蔵庫２内の圧力が導入
されている。Since the tip of the discharge pipe 10 is open to the atmosphere, the diaphragm chamber 51 on the downstream side is substantially at atmospheric pressure. or,
The pressure in the storage 2 is introduced into the diaphragm chamber 50 on the upstream side.
ここで、前述したように庫内のCO2濃度が高くなり制御
回路７の制御動作によりガス供給弁8aが開弁され、窒素
タンク33内の加圧されたN2ガスが庫内に供給されると、
庫内の圧力が上昇する。従って、圧力制御弁47の圧力検
出部48のダイヤフラム室50には庫内の高圧ガスが導入さ
れる。そのため、ダイヤフラム49はダイヤフラム室50と
51との差圧により上動し、圧力制御弁47は開弁する。こ
れにより、貯蔵庫２内のガスは排出配管10を介して外部
に排気される。Here, as described above, the CO 2 concentration in the chamber becomes high, the gas supply valve 8a is opened by the control operation of the control circuit 7, and the pressurized N 2 gas in the nitrogen tank 33 is supplied to the chamber. Then,
The pressure inside the chamber rises. Therefore, the high-pressure gas in the storage is introduced into the diaphragm chamber 50 of the pressure detection unit 48 of the pressure control valve 47. Therefore, the diaphragm 49 and the diaphragm chamber 50
The pressure control valve 47 is opened by moving upward due to the pressure difference with the pressure control valve 51. As a result, the gas in the storage 2 is exhausted to the outside through the exhaust pipe 10.
そして、庫内の雰囲気ガスが最適ガスに置換されると、
ガス供給弁8aは閉弁される。しかし、庫内は加圧状態で
あるので、圧力制御弁47は閉弁状態を保ち庫内をさらに
減圧する。所定時間経過後貯蔵庫２が略大気圧に減圧さ
れると、圧力制御弁47は自動的に閉弁する。Then, when the atmospheric gas in the refrigerator is replaced with the optimum gas,
The gas supply valve 8a is closed. However, since the inside of the refrigerator is under pressure, the pressure control valve 47 maintains the closed state to further reduce the pressure inside the refrigerator. When the storage 2 is depressurized to a substantially atmospheric pressure after a predetermined time has elapsed, the pressure control valve 47 is automatically closed.
このように、圧力制御弁47は、ガス供給弁8aが閉弁して
貯蔵庫２内のガスの置換が終了した後も継続して開弁状
態を保つことにより、貯蔵庫２の圧力を略大気圧となる
ように調整することができる。そのため、貯蔵庫２内
は、例えば青果物等の貯蔵物を長期間保存するのに適し
た最適なガス濃度割合に制御されるとともに、青果物が
貯蔵された貯蔵庫２内の圧力を減圧して青果物がいたま
ない圧力に制御される。In this way, the pressure control valve 47 keeps the pressure of the storage 2 substantially at atmospheric pressure by keeping the valve open state even after the gas supply valve 8a is closed and the replacement of the gas in the storage 2 is completed. Can be adjusted to be Therefore, the inside of the storage 2 is controlled to have an optimum gas concentration ratio suitable for long-term storage of stored products such as fruits and vegetables, and the pressure in the storage 2 in which the fruits and vegetables are stored is reduced to produce fruits and vegetables. Controlled by pressure.
発明の効果 上述の如く、本発明によれば、気体供給弁が閉弁した後
も排気弁の開弁を継続し、前記貯蔵庫内の圧力が略大気
圧になったとき排気弁を閉弁させるため、貯蔵庫内の気
体の置換が終了した後、貯蔵庫の圧力を略大気圧となる
ように調整することができる。そのため、庫内を例えば
青果物等の貯蔵物を長期間保存するのに適した最適なガ
ス濃度割合に制御するとともに、青果物が貯蔵された貯
蔵庫内の圧力を減圧して青果物がいたまない圧力に調整
することができる。その結果、貯蔵庫内に貯蔵された青
果物等の品質劣化を防止することができ、貯蔵物を長期
間安定的に保存することができる。EFFECTS OF THE INVENTION As described above, according to the present invention, the exhaust valve is continuously opened even after the gas supply valve is closed, and the exhaust valve is closed when the pressure in the storage reaches the atmospheric pressure. Therefore, after the replacement of the gas in the storage is completed, the pressure in the storage can be adjusted to be substantially atmospheric pressure. Therefore, while controlling the inside of the container to an optimal gas concentration ratio suitable for long-term storage of stored products such as fruits and vegetables, reduce the pressure in the storage container where the fruits and vegetables are stored to a pressure where fruits and vegetables are irresistible. Can be adjusted. As a result, it is possible to prevent deterioration of the quality of fruits and vegetables stored in the storage, and it is possible to stably store the stored products for a long period of time.
第１図は本発明になる貯蔵装置の一実施例の構成図、第
２図は制御回路の回路図、第３図はガス供給弁、排気弁
の開閉及び庫内の圧力変化を示す図、第４図は本発明の
変形例の構成図である。 １……貯蔵装置、２……貯蔵庫、３……気体分離ユニッ
ト、４……圧縮ユニット、５……O2センサ、６……CO2
センサ、７……制御回路、８……N2配管、8a……ガス供
給弁、10……排出配管、11……排気弁、21,22……吸着
槽、33……窒素タンク、45……遅延リレー、47……圧力
制御弁。FIG. 1 is a configuration diagram of an embodiment of a storage device according to the present invention, FIG. 2 is a circuit diagram of a control circuit, and FIG. 3 is a diagram showing opening / closing of a gas supply valve and an exhaust valve and pressure change in a refrigerator, FIG. 4 is a block diagram of a modified example of the present invention. 1 ... Storage device, 2 ... Storage, 3 ... Gas separation unit, 4 ... Compression unit, 5 ... O 2 sensor, 6 ... CO 2
Sensor, 7 ... Control circuit, 8 ... N 2 piping, 8a ... Gas supply valve, 10 ... Exhaust piping, 11 ... Exhaust valve, 21,22 ... Adsorption tank, 33 ... Nitrogen tank, 45 ... … Delay relay, 47 …… Pressure control valve.
Claims (1)
所定濃度の気体を供給する気体供給源と、該貯蔵庫と該
気体供給源とを連通する給気配管に設けられた気体供給
弁と、該貯蔵庫と外部とを連通する排出配管に設けられ
た排気弁とを有し、該気体供給弁及び排気弁の開弁によ
り該貯蔵庫内の気体を気体供給源からの気体に置換する
貯蔵装置において、 前記貯蔵庫内の気体の置換が終了したとき前記気体供給
弁を閉弁し、その後も前記排気弁の開弁を継続し、前記
貯蔵庫内の圧力が略大気圧になったとき前記排気弁を閉
弁させる圧力調整手段を具備してなることを特徴とする
貯蔵装置。1. A storage box in which a stored material is stored, a gas supply source for supplying a gas having a predetermined concentration to the storage box, and a gas supply valve provided in an air supply pipe connecting the storage box and the gas supply source. And an exhaust valve provided in an exhaust pipe that communicates the storage with the outside, and a storage that replaces the gas in the storage with a gas from a gas supply source by opening the gas supply valve and the exhaust valve. In the device, the gas supply valve is closed when the replacement of the gas in the storage is completed, the opening of the exhaust valve is continued even after that, and the exhaust is performed when the pressure in the storage becomes substantially atmospheric pressure. A storage device comprising a pressure adjusting means for closing a valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33894490A JPH07102035B2 (en) | 1990-11-30 | 1990-11-30 | Storage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33894490A JPH07102035B2 (en) | 1990-11-30 | 1990-11-30 | Storage device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04207121A JPH04207121A (en) | 1992-07-29 |
| JPH07102035B2 true JPH07102035B2 (en) | 1995-11-08 |
Family
ID=18322794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33894490A Expired - Fee Related JPH07102035B2 (en) | 1990-11-30 | 1990-11-30 | Storage device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07102035B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015167219A1 (en) * | 2014-04-29 | 2015-11-05 | 경상대학교산학협력단 | Processing device capable of preventing oxidation and processing method using same |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4988613B2 (en) * | 2008-01-22 | 2012-08-01 | 日立アプライアンス株式会社 | refrigerator |
| WO2015049840A1 (en) * | 2013-10-03 | 2015-04-09 | ダイキン工業株式会社 | Refrigeration unit for container |
| JP2015198639A (en) * | 2014-03-31 | 2015-11-12 | ダイキン工業株式会社 | Mixed gas supply device and refrigeration device for container |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6447317A (en) * | 1987-08-17 | 1989-02-21 | Mitsubishi Kakoki Kk | Ca storage device |
-
1990
- 1990-11-30 JP JP33894490A patent/JPH07102035B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015167219A1 (en) * | 2014-04-29 | 2015-11-05 | 경상대학교산학협력단 | Processing device capable of preventing oxidation and processing method using same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04207121A (en) | 1992-07-29 |
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