JP2010210171A - Storage, oxygen concentration adjusting method, and storing method of food conservation space - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein, when oxygen concentration of a food conservation space is reduced by an oxygen concentration adjusting means using a hydrogen ion conductive polymer solid electrolyte film, deoxidation is carried out by reacting hydrogen ions generated by water electrolysis with oxygen generates hydrogen, but hydrogen is generated if hydrogen ions generated by the water electrolysis become excessive, since an oxygen amount which should be removed changes according to an amount of food. <P>SOLUTION: The deoxidation is carried out in a deoxidation auxiliary container 8 by using the oxygen concentration adjusting means 5 composed of the polymer solid electrolyte film, a negative electrode, a positive electrode, and a power supply electrode. Next, gas in the deoxidized deoxidation auxiliary container 8 is introduced to the food conservation space 10 by using a deoxidation gas introducing means 6 for reducing the oxygen concentration of the food conservation space 10. Since a certain amount of the deoxidation is carried out regardless of the food amount, the hydrogen ions do not become excessive, and the hydrogen is not generated. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a storage such as a refrigerator, an oxygen concentration adjustment method, and a food storage space storage method that can adjust the oxygen concentration of an atmosphere in which food is stored.

  In recent years, large refrigerators have become widespread, and you can often see a week of buying one week at a supermarket. As a method for preserving food for a long period of time, freezing is generally used. However, frozen storage destroys the tissue of food, and for meat and the like, it cannot be denied that the taste is lowered by the outflow of drip upon thawing.

  In addition, freezing requires time for thawing when cooking, and it is a matter that a working woman wants to avoid spending as much time as possible. In addition, a method for reducing the oxygen concentration has been devised as a means for long-term storage, and it is possible to prevent oxidation and discoloration of fats and oils in foods.

  As an effective deoxygenation technique for that purpose, an electrochemical oxygen concentration adjusting means using a polymer solid electrolyte membrane is known, and a refrigerator using this is proposed (Patent Document 1), but it has been put into practical use. Not in.

In this method, the following elements are used. The structure of the device is such that a catalyst layer such as platinum is provided on both sides of a proton conductive polymer solid electrolyte, and a supply electrode is provided on both sides thereof. By applying a voltage to the supply electrode, water is decomposed and oxygen and hydrogen ions are generated on the anode side, and the generated hydrogen ions move to the cathode side in the polymer solid electrolyte. The cathode faces a space to be deoxygenated, and oxygen in the space reacts with hydrogen ions moved from the anode to generate water. Apparently, the oxygen on the cathode side decreases and the oxygen on the anode side increases, so that it acts as an oxygen pump and can reduce the oxygen concentration on the cathode side.
JP-A-2005-48977

  By the oxygen concentration adjusting means using the above polymer solid electrolyte, excessive hydrogen ions may be supplied to the amount of oxygen in the cathode side space for storing food, etc., in which case hydrogen is released, The issue is the possibility of explosions.

  The following explains the mechanism of hydrogen release and the reason why it is difficult to avoid excessive supply of protons.

  First, the mechanism of hydrogen release is as follows.

  Even when deoxygenation progresses and the oxygen concentration becomes 0, the supply of hydrogen ions from the anode to the cathode continues as long as a voltage is applied to the oxygen concentration adjusting means. This hydrogen ion should react with oxygen originally, but since there is no oxygen, it is reduced at the cathode to become hydrogen and released into the space on the cathode side.

  Next, the reason why it is difficult to avoid supplying excessive hydrogen ions to oxygen will be described.

The amount of deoxygenated is proportional to the amount of hydrogen ions supplied from the anode to the cathode, and the amount of proton supplied is proportional to the charge flowing through the oxygen concentration adjusting means (the integrated value of the current). Therefore, if the amount of oxygen to be removed in advance is known, excessive deoxygenation can be avoided by releasing the voltage application to the oxygen concentration adjusting means when the necessary charge (integral value of current) is reached. .

  However, even if the volume of the space for storing food or the like is constant, it is impossible to make the volume of the food to be contained constant, so the amount of oxygen to be removed is not constant. As a result, when deoxygenation is performed until the integrated value of the current corresponding to the standard deoxygenation amount is reached, when the food volume is large, hydrogen ions supplied to the oxygen amount become excessive and hydrogen is generated. .

  The present invention solves the above-described conventional problems, and provides a storage such as a refrigerator that avoids hydrogen release into a space for storing food and the like, and safely realizes food storage at a low oxygen concentration. Objective.

  In order to solve the above conventional problems, the storage of the present invention comprises an oxygen concentration adjusting means, an external gas replacement means, and a desorption means comprising a solid polymer electrolyte membrane having hydrogen ion conductivity sandwiched between an anode and a cathode. It has a configuration having a deoxygenation auxiliary container provided with an oxygen gas introduction means, and the deoxygenation auxiliary container and a detachable food storage space. And the oxygen concentration adjustment method of the food storage space, as a first step, using the external gas replacement means, replace the gas in the deoxygenation auxiliary container with a gas that has not been deoxygenated outside the container, As a second step, a voltage is applied to the oxygen concentration adjusting means to adjust the oxygen concentration in the deoxygenation auxiliary container, and as a third step, the gas in the deoxygenation auxiliary container is passed through the deoxygenation gas introducing means. It is comprised by introducing into the said food preservation space.

  Even when the amount of food or the like changes, the volume of the deoxygenation auxiliary container to be deoxygenated is constant, so that excessive supply of hydrogen ions during deoxygenation does not occur, and release of hydrogen is avoided.

  The storage room for adjusting the oxygen concentration according to the present invention does not cause excessive supply of hydrogen ions and avoids the release of hydrogen. In addition, it is possible to safely and efficiently deoxygenate a space where food is stored. As a result, food can be safely stored in a high quality state for a long period of time at a low cost.

  The first invention is a storage having an oxygen concentration adjusting means comprising a solid polymer electrolyte membrane having hydrogen ion conductivity sandwiched between an anode and a cathode, wherein the oxygen concentration adjusting means and the external gas replacement means And a deoxygenation auxiliary container provided with deoxygenation gas introducing means, and the deoxygenation auxiliary container and a detachable food storage space.

  The oxygen concentration adjusting method of the third invention described below is applied to the storage. Thus, instead of directly deoxygenating oxygen in the food storage space that changes depending on the volume of food as in the past, the deoxygenation auxiliary container having a constant volume is deoxygenated. . As a result, excessive hydrogen ion supply to oxygen does not occur, and all the hydrogen ions react with oxygen to become water. In this way, the release of hydrogen is avoided, and the effect of enabling safe oxygen concentration adjustment and high-quality food storage is obtained.

  In particular, according to the second invention, in the first invention, the food storage space is formed by sealing the upper portion of the oxygen concentration adjusting tray with a gas barrier film.

The food storage space is formed by sealing the upper part of the oxygen concentration adjustment tray with a gas barrier film, so that the volume of gas in the food storage space is larger than when food is placed in a fixed container. Get smaller. For this reason, the amount of oxygen to be removed is reduced, and a large amount of food can be stored under deoxygenated conditions. Further, since the amount of oxygen to be removed is reduced, it is possible to reduce the size of the oxygen concentration adjusting means, and it is possible to obtain an effect that food can be stored in a high quality state at low cost.

A third invention is a deoxygenation assisting device comprising an oxygen concentration adjusting means comprising a solid polymer electrolyte membrane having hydrogen ion conductivity sandwiched between an anode and a cathode, an external gas substitution means, and a deoxygenation gas introduction means. A method for adjusting the oxygen concentration of a food storage space using a container, and a depot with a food storage space that is detachable from the auxiliary oxygen storage container,
As a first step, the external gas replacement means is used to replace the gas in the deoxygenation auxiliary container with a non-deoxygenated gas outside the container, and as a second step, a voltage is applied to the oxygen concentration adjusting means. It is applied to adjust the oxygen concentration in the deoxygenation auxiliary container, and as a third step, the gas in the deoxygenation auxiliary container is introduced into the food storage space through deoxygenation gas introducing means.

  As already described with respect to the first invention, oxygen in the food storage space that varies depending on the volume of the food as in the prior art is not directly removed, but the above-mentioned deoxygenation auxiliary container having a constant volume is removed. Since oxygen is supplied, excessive hydrogen ion supply to oxygen does not occur, and release of hydrogen is avoided. As a result, it is possible to obtain an effect that the oxygen concentration can be adjusted and the food can be stored in a high quality state.

  In particular, the fourth invention has a configuration in which, in the third invention, the first step, the second step, and the third step are sequentially repeated a plurality of times.

  By repeating the introduction of the deoxygenated gas many times, a lower oxygen concentration can be realized with the same deoxygenation amount as compared with the case where the deoxygenation is performed only once. As a result, the oxygen concentration can be easily adjusted, and an effect can be obtained in which food can be stored more easily in a high quality state.

  In particular, according to a fifth aspect of the present invention, in the first or second aspect of the invention, a plurality of food storage spaces are simultaneously connected to the deoxygenation auxiliary container.

  Simultaneously connecting multiple food storage spaces to a deoxygenation auxiliary container enables the storage of foods with different timings to be taken in and out of the food storage space, or foods that cannot be stored in the same food storage space due to odor transfer, etc. The effect becomes.

  In a sixth aspect of the present invention, in particular, in any one of the first, second, and fifth aspects, the food storage space includes a deoxygenation auxiliary container connecting portion opening / closing means.

  Since the food storage space has the deoxygenation auxiliary container connection part opening / closing means, the hermeticity of the food storage space is maintained even when the food storage space is detached from the deoxygenation auxiliary container. For this reason, it is possible to detach the food storage space from the deoxygenation auxiliary container while maintaining the adjusted oxygen concentration. Furthermore, by connecting the new food storage space to the deoxygenation auxiliary container and repeating the oxygen concentration adjustment, the effect of being able to adjust the oxygen concentration of many food storage spaces using one deoxygenation auxiliary container can be obtained. .

  In particular, according to the seventh invention, in any of the third and fourth inventions, the oxygen concentration is adjusted by connecting a plurality of food storage spaces to the deoxygenation auxiliary container.

  As described in the fifth aspect, by connecting a plurality of food storage spaces to the deoxygenation auxiliary container and adjusting the oxygen concentration, it is possible to store food that cannot be stored in the same food storage space. It is done.

  The eighth invention is a deoxygenation assisting device comprising an oxygen concentration adjusting means comprising a solid polymer electrolyte membrane having hydrogen ion conductivity sandwiched between an anode and a cathode, an external gas substitution means, and a deoxygenation gas introduction means. A container having a container, a food storage space detachably attached to the deoxygenation auxiliary container, and the food storage space having the deoxygenation auxiliary container connection part opening / closing means; Substituting means is used to replace the gas in the deoxygenation auxiliary container with the non-deoxygenated gas outside the container, and as a second step, a voltage is applied to the oxygen concentration adjusting means, thereby providing deoxygenation assistance. Adjusting the oxygen concentration of the container, and as a third step, after adjusting the oxygen concentration of the food storage space by introducing the gas in the deoxygenation auxiliary container into the food storage space through the deoxygenation gas introducing means, Goods by deoxygenation auxiliary container connecting opening and closing means of storage space close the deoxygenation auxiliary container connecting unit, configured by storing to desorb the food storage space continues from the deoxygenation auxiliary container.

  After adjusting the oxygen concentration in the food storage space, close the deoxygenation auxiliary container connection part by the deoxygenation auxiliary container connection part opening / closing means of the food storage space, and subsequently remove and store the food storage space from the deoxygenation auxiliary container Thus, it is possible to store it while maintaining the adjusted oxygen concentration. Further, by detaching and storing the food storage space, it is possible to connect another food storage space to the deoxygenation auxiliary container, and the oxygen concentration of the food storage space can be adjusted. By repeating this, it is possible to obtain an effect of adjusting the oxygen concentration in many food storage spaces.

  In particular, the ninth invention has a configuration in which, in the eighth invention, the first step, the second step, and the third step are sequentially repeated a plurality of times.

  As described in the fourth invention, the introduction of the deoxygenated gas is repeated many times, so that the adjustment of the low oxygen concentration with higher accuracy can be realized. As a result, the oxygen concentration can be easily adjusted, and an effect can be obtained in which food can be stored more easily in a high quality state.

  In a tenth aspect of the invention, in particular, in the eighth or ninth aspect of the invention, a plurality of food storage spaces are simultaneously connected to the deoxygenation auxiliary container.

  As described in the fifth aspect, by simultaneously connecting a plurality of food storage spaces to the deoxygenation auxiliary container, it is possible to obtain an effect that enables storage of foods that cannot be stored in the same food storage space.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view showing a food storage space capable of adjusting the oxygen concentration in a refrigerator as a storage in the present embodiment.

  FIG. 1 shows one of a plurality of storage chambers of a refrigerator as a storage, which is formed by a storage chamber door 1 on the entire surface, a heat insulating partition wall 2 on the upper and lower surfaces, and a partition plate 4. The food storage container 9 whose inside is the food storage space 10 is connected to the deoxygenation auxiliary container 8 in the space. The deoxygenation auxiliary container 8 includes an external gas replacement unit 7, an oxygen concentration adjustment unit 5, and a deoxygenation gas introduction unit 5.

  In addition, a cooler, a fan, etc. are installed in the space between the partition plate 4 and the main body heat insulating wall 3 or the space connected thereto, and cool air is supplied to the storage room. Equipment, fans, etc. are omitted.

  FIG. 2 shows a procedure for deoxygenation of the food storage space according to the present embodiment.

  Hereinafter, an outline of a specific method of adjusting the oxygen concentration and the function of each unit will be described with reference to FIGS. 1 and 2.

  Deoxidation of the food storage space 9 proceeds in three steps in FIG.

  The first step is “substitution of the gas in the deoxygenation auxiliary container with an external gas”. This step is performed by the external gas replacement means 7 included in the deoxygenation auxiliary vessel 8. Specifically, the external gas replacement means 7 is a kind of opening / closing device, and first performs an opening operation. As a result, the gas inside the deoxygenation auxiliary container 8 is released to the outside, and the external gas is introduced into the deoxygenation auxiliary container 8.

  The purpose of this step is to keep the oxygen concentration of the gas in the deoxygenation auxiliary vessel 8 at about 21%, which is the same as that in the atmosphere, prior to step 2 by the above-described replacement. If the oxygen concentration is kept at a constant value of 21%, the volume of the deoxygenation auxiliary container 8 is constant, so that the total oxygen amount in the deoxygenation auxiliary container 8 becomes constant. As a result, as will be described below, in step 2, hydrogen ions and oxygen react without excess and deficiency, and hydrogen generation does not proceed.

  The second step is “deoxygenation in the deoxygenation auxiliary vessel”. In this step, deoxidation in the deoxygenation auxiliary vessel 8 is performed by applying a voltage to the oxygen concentration adjusting means 5 of the deoxygenation auxiliary vessel 8. What is important here is that the charge corresponding to the total amount of oxygen in the deoxidation auxiliary vessel 8 (the charge that flows when the voltage is applied to the oxygen concentration adjusting means 5) is controlled to flow by voltage application. . This generates hydrogen ions equivalent to the charges, which react with oxygen and are removed. That is, hydrogen ions corresponding to the amount of oxygen in the deoxygenation auxiliary vessel 8 are generated and reacted with the oxygen, so that they react to generate water without excess or deficiency. For this reason, surplus hydrogen ions are not generated and hydrogen generation does not proceed.

  In this operation, both the external gas replacement means 7 which is a kind of opening / closing mechanism and the deoxygenation gas introducing means 6 which is also a kind of opening / closing mechanism are closed, and the deoxygenation auxiliary container is isolated. To do. The operation of the deoxygenated gas introducing means 6 will be described in the third step.

  The third step is “introduction of gas in the deoxygenation auxiliary container into the food storage space”. In this step, the deoxygenated gas introducing means 6 which is a kind of opening / closing mechanism is opened. Thus, the deoxygenated gas in the deoxygenation auxiliary container 8 is introduced into the food storage space 10 that has not been deoxygenated and becomes uniform. Thus, the oxygen concentration of the food storage space 10 is reduced by introducing the deoxygenated gas.

  As described above, in the present embodiment, in order to deoxygenate the inside of the deoxygenation auxiliary container 8 with a fixed volume and oxygen concentration, the amount of oxygen to be always removed is constant, and the charge corresponding to the amount of oxygen is expressed as oxygen. By controlling the flow when the voltage is applied to the concentration adjusting means 5, oxygen and hydrogen ions react without excess and deficiency, and release of hydrogen can be avoided. As a result, it is possible to obtain an effect of enabling safe oxygen concentration adjustment and storage of food in a high quality state.

  It should be noted that gas diffusion is promoted to replace the gas in the deoxygenation auxiliary container 8 with external gas (step 1), the introduction of the deoxygenated gas in the deoxygenation auxiliary container 8 into the food storage space 10, and uniform In order to accelerate the conversion (step 3), it is preferable to install a fan. As a place to install, the inside of the deoxidation auxiliary container 8 is preferable.

In step 2, since the inside of the deoxygenation auxiliary container 8 is depressurized by deoxygenation, the deoxygenation auxiliary container needs to have a strength that can withstand the pressure difference, such as a thick resin container or a metal container. Is used.

  Alternatively, the depressurization as described above occurs when the deoxygenation auxiliary container 8, the external gas replacement means 7, and the deoxygenation gas introduction means 6 have high sealing properties. By reducing the hermeticity of the container 8, the external gas replacement means 7, and the deoxygenated gas introducing means 6, or by providing a pinhole in the deoxygenated auxiliary container 8, the inside of the deoxygenated auxiliary container 8 is not decompressed and has a thickness. It is possible to use a thin resin case having a normal strength.

  Next, details of the oxygen concentration adjusting means will be described with reference to FIG.

  FIG. 3 is a cross-sectional view of the oxygen concentration adjusting means 5 in the present embodiment. As shown in FIG. 3, the oxygen concentration adjusting means 5 has a polymer solid electrolyte membrane 12 at the center, a cathode 13 on the left side, an anode 14 on the right side, and a supply electrode 15 provided outside each electrode. In addition, these are fixed by a frame 11. Further, the oxygen concentration adjusting means 5 is configured so that the cathode 13 is inside the deoxygenation auxiliary hand vessel 8 and the anode 14 is outside the deoxygenation auxiliary vessel 8 in order to deoxygenate the inside of the deoxygenation auxiliary vessel 8. Be placed.

  Subsequently, the operation of the oxygen concentration adjusting means 5 will be described with reference to FIG. The voltage application to the oxygen concentration adjusting means 5 is performed by voltage application to the two supply electrodes 15. By this voltage application, water vapor in the air is electrolyzed on the anode 14 side to generate oxygen, and simultaneously generated hydrogen ions are passed through the polymer solid electrolyte membrane 12 from the anode 14 to the cathode 13 by the applied voltage. Move to. Since water is supplied as water vapor from the space on the anode 14 side, the humidity in the space on the anode 14 side decreases.

  On the other hand, oxygen in the cathode 13 side space reacts with hydrogen ions that have moved to the cathode 13 side to become water. Thus, deoxidation on the cathode 13 side proceeds. At this time, much of the generated water is taken into the electrolyte membrane, but a part of the water is released to the cathode 13 side space and raises the humidity of the corresponding space. Further, the water taken into the electrolyte moves to the anode 11 side and is decomposed into oxygen and hydrogen ions.

  Accordingly, as a whole, the oxygen concentration in the cathode 13 side space decreases and the oxygen concentration on the anode 14 side increases, so that oxygen is pumped from the cathode 13 side to the anode 14 side. At the same time, the water vapor is pumped from the anode 14 side to the cathode 13 side.

  As the polymer solid electrolyte membrane 12 used in the present embodiment, for example, a perfluorocarbon sulfonic acid membrane (film thickness: several tens μm to several hundreds μm) is preferably used. For the anode 14 and the cathode 13, a porous electrode is used which has a suitable water repellency by pressure molding a mixture of a carbon powder carrying a catalyst such as platinum and a fluororesin powder. Further, a carbon cloth, carbon paper, or the like is used for the power supply body 12. However, the anode 14 is preferably formed by forming a platinum layer directly on the polymer solid electrolyte 12 without using carbon powder that is easily oxidized by applying a voltage as a carrier such as platinum. Further, as the anode-side suction electrode 15, mesh-like titanium whose surface is platinum-plated is preferably used instead of the carbon paper or carbon cloth.

  The external gas replacement means 7 and the deoxygenated gas introduction means 6 used in the present embodiment are the open / close mechanisms already described, and an electromagnetic valve, a valve using air pressure, a switch or the like is used.

As described above, according to the configuration of the present embodiment, the oxygen concentration in the food storage space can be safely reduced without generating hydrogen, and the food can be safely stored for a long period of time with high quality. .

  In addition, the structure and material of each part described in this Embodiment can be applied suitably also in the following embodiment, unless the difference in structure is described.

(Embodiment 2)
Next, a second embodiment will be described.

  In the present embodiment, the same configuration as that of the first embodiment has the same operational effects, and the same reference numerals are given and description thereof is omitted. Therefore, only different parts will be described.

  The structural feature of the present embodiment is that when the oxygen concentration is adjusted, the number of introductions of the deoxygenated gas into the space for storing the food is set to a plurality of times.

  Hereinafter, the oxygen concentration adjusting method of the present embodiment will be described with reference to FIG.

  In the oxygen concentration adjustment method of the present embodiment, the first to third steps are the same as those in FIG. 2, and the first to third steps are repeated a plurality of times as necessary.

  FIG. 5 shows the number of repetitions of this step and the change in oxygen concentration at that time. Specifically, regarding the case where the volume of the oxygen storage auxiliary container 8 is equal to the volume of the food storage space 10 and the case where the volume of the oxygen storage auxiliary container 8 is three times the volume of the food storage space 10, The change in the oxygen concentration of the food storage space 10 is plotted against the number of repetitions of the step.

  Further, the adjusted oxygen concentration in the deoxygenation auxiliary vessel 8 in the second step was set to 4%. The adjusted oxygen concentration is 4% here, but can be arbitrarily set between 0 and 21%.

  When the volume of the food storage space 10 is equal to the volume of the deoxygenation auxiliary container 8, the oxygen concentration decreases abruptly in 0 to 3 times according to the number of repetitions of the step, and the oxygen concentration is saturated after 3 times. It can be seen that the adjusted oxygen concentration converges to 4%.

  On the other hand, when the volume of the deoxygenation auxiliary container 8 is three times the volume of the food storage space 10, the number of repetitions of the first to third steps is 0 to 2, and the deoxygenation auxiliary container 8 in the second step The adjusted oxygen concentration converges to around 4%. However, since the volume of the original deoxygenation auxiliary container 8 is three times the above (when the volume of the food storage space 10 and the deoxygenation auxiliary container 8 is equal), the number of repetitions of the first to third steps is the same. For example, the amount of deoxygenation is three times the above (when the volume of the food storage space 10 and the deoxygenation auxiliary container 8 is equal), and deoxidation requires three times as much time.

  For example, the deoxygenation amount is equal to the volume of the food storage space 10 and the deoxygenation auxiliary container 8, and the number of repetitions of the first to third steps is 3, and the volume of the deoxygenation auxiliary container 8 is When the number of repetitions of the first to third steps is 1, it is equal to 3 times the volume. Comparing these two cases in FIG. 5, the oxygen concentration is lower when the volume of the deoxygenation auxiliary container is smaller and the number of repetitions of the first to third steps is larger, and the food storage space is deoxygenated more efficiently. I understand that.

As described above, according to the configuration of the present embodiment, a low oxygen concentration can be realized more efficiently in a short time, and food can be more efficiently stored for a long time with high quality. This is because the smaller the volume of the auxiliary oxygen storage container, the smaller the loss due to substitution with external gas (increase in oxygen concentration) in step 1.

  In addition, since the deoxygenation auxiliary container is small, an effect that the space in the storage such as the refrigerator can be used without waste is also obtained.

  Note that the configuration described in this embodiment can be preferably applied to the following embodiment, unless the difference in configuration is particularly described.

(Embodiment 3)
Next, a third embodiment will be described.

  In the present embodiment, the same configuration as in the first and second embodiments has the same operational effects, and the same reference numerals are given and the description thereof is omitted. Therefore, only different parts will be described.

  The structural feature of the present embodiment is in the formation of the food storage space, and the other configuration is the same as that of the first embodiment. The oxygen concentration adjusting means used is the same as in the first embodiment. In addition, regarding the procedure of the oxygen concentration adjusting method, the same method as described in the first and second embodiments is used.

  Below, the specific structure of the food storage space in this Embodiment is demonstrated using FIG. 6, FIG.

  FIG. 6 shows a cross-sectional view of one of a plurality of storage chambers of a refrigerator that is a storage as in FIG. FIG. 7A is a cross-sectional view showing an oxygen concentration adjusting tray according to Embodiment 3 of the present invention, and FIG. 7B is a cross-sectional view taken along the line AA of the oxygen concentration adjusting tray. FIG. 7A differs from FIG. 1 of Embodiment 1 in Embodiment 3 of the present invention in that the food storage space 10 is formed by the food storage container 9 in FIG. The food storage space 10 is a space formed by placing food on the oxygen concentration adjusting tray 16 and covering it with the gas barrier film 18.

  Further, the oxygen concentration adjustment is performed by repeating the first to third steps once or a plurality of times as in the first or second embodiment.

  Thus, by forming the food storage space 10 from the oxygen concentration adjusting tray 16 and the gas barrier film 18, the food storage space 10 is significantly reduced. This is because the space occupied by the food other than the food is extremely reduced by covering the food with the gas barrier film 18 in contact with the food. As a result, the volume of the gas to be deoxygenated is reduced, the deoxygenation of the food storage space can be efficiently performed in a short time, and many foods can be stored with high quality. Moreover, since the volume of the gas to be deoxygenated is reduced, the size of the oxygen concentration adjusting means 5 can be reduced. By doing so, it is possible to obtain an effect that enables food to be stored in high quality at low cost.

  Here, the gas barrier film used in the present embodiment is a transparent film having low flexibility and low oxygen permeability, and the oxygen permeability is required to be about 20000 mL / m 2 · day · atm or less. For example, a film of a hydrocarbon-based organic polymer such as polyethylene or a film obtained by depositing an inorganic substance such as silica on the organic polymer film is used. Further, the oxygen permeability is preferably 1000 mL / m 2 · day · atm or less. As a film satisfying such conditions, a polyvinylidene chloride film having an oxygen transmission rate as low as 55 mL / m 2 · day · atm is particularly preferably used.

  In addition, when using food storage containers made of plastic or metal, the container is not sufficiently transparent, so it is necessary to open the container to check the contents of the stored food. The problem was that the concentration would increase. However, since the gas barrier film is highly transparent, it is possible to check the contents from the outside without removing the sealing of the food storage space except for the film, which has the effect of greatly improving usability. is there.

  Further, the relationship between the deoxygenation auxiliary container and the oxygen concentration adjusting tray will be described below with reference to FIG.

  As shown in FIG. 6, the oxygen concentration adjusting tray 16 is connected to the deoxygenation auxiliary container 8 by the deoxygenation auxiliary container connection part 17 so that there is no gas leakage.

  In addition, the deoxygenation auxiliary container 8 and the oxygen concentration adjustment tray 16 are detachable and fitted, and if necessary, a sealing material, packing, or the like can be used to eliminate leakage at the connection portion.

  Since the oxygen concentration adjusting tray 16 is removed from the deoxygenation auxiliary container and taken out of the refrigerator, food is placed on the oxygen concentration adjusting tray 16, and then the gas barrier film is removed. After the food is covered, it can be connected to the deoxidation auxiliary container 8 and used. Thus, since food is put out and put on the outside, an effect of greatly improving usability can be obtained.

  Next, the oxygen concentration adjustment tray will be described in more detail with reference to FIG.

  FIG. 7 is a cross-sectional view of the oxygen concentration adjusting tray in the present embodiment. Specifically, FIG. 7A is a cross-sectional view in the direction of connection with the deoxygenation auxiliary container 8, and FIG. 7B is a cross-sectional view taken along the line A? A in FIG. .

  The deoxygenation auxiliary container connecting portion 17 of the oxygen concentration adjusting tray 16 has a large opening on the connection side with the deoxygenation auxiliary container 8 as shown in FIG. Through the opening, the deoxygenated auxiliary container 8 and the deoxygenated gas introducing means 6 can be used to efficiently supply the deoxygenated gas to the food storage space 10.

  In the present embodiment, it is preferable to provide a ventilation groove in the lower part or the side part of the oxygen concentration adjusting tray 16. As a result, even when many foods are placed on the oxygen concentration adjustment tray 16, a uniform oxygen concentration can be achieved in a short time through the ventilation groove, and the food can be stored in a high quality state uniformly. The effect becomes. Further, in order to promote gas diffusion in a wide range, the ventilation groove preferably extends from the vicinity of the deoxygenation auxiliary container connecting portion 17 to the end opposite to the deoxygenation auxiliary container 8.

  Further, when the food storage space is formed by covering the upper part of the oxygen concentration adjusting tray with a gas barrier film as in the present embodiment, the adhesion between the gas barrier film and the oxygen concentration adjusting tray is increased. In order to suppress the entry and exit of gas inside and outside the storage space, a jig for pressing the gas barrier film against the food storage space is preferably used. For example, a belt-like fixing jig for fastening the gas barrier film from the outside is used.

(Embodiment 4)
Next, a fourth embodiment will be described.

In the present embodiment, the same configuration as in the first to third embodiments has the same operational effects, and the same reference numerals are given and description thereof is omitted. Therefore, only different parts will be described.

  A structural feature of the present embodiment is that a plurality of food storage spaces are connected to one deoxygenation auxiliary container.

  Here, the storage according to the present embodiment will be specifically described with reference to FIG. The structure of the storage is similar to that of FIG. 6 of the third embodiment, except that the two food storage spaces 10 are connected to the deoxygenation auxiliary container 8 as described above. Other configurations are the same as those of the third embodiment, and the same oxygen concentration adjusting means is used. In addition, regarding the procedure of the oxygen concentration adjusting method, the same method as that described in the first, second and third embodiments is used.

  Thus, the freedom degree of the food preserve | saved in a food storage space increases by taking the structure which connects several food storage space to one deoxygenation auxiliary container. For example, if there is food that you want to take out in 2 days and food that you want to take out in 3 days, if you store it in one food storage space, you need to adjust the oxygen concentration again after taking it out on the 2nd day. If the structure of embodiment is taken, in order to preserve | save in a separate food preservation space, the necessity becomes unnecessary. Moreover, even when it is not desired to store in the same food storage space due to odor transfer or the like, the effect of suppressing the odor transfer can be obtained by storing in a separate food storage space.

  Here, the case where the food storage space is covered with the gas barrier film corresponding to FIG. 6 of the third embodiment has been described, but the sealed food corresponding to FIG. 1 of the first embodiment is used. Of course, it is also possible to use a food storage space formed by a storage container.

(Embodiment 5)
Next, a fifth embodiment will be described.

  In the present embodiment, the same configuration as in the first to fourth embodiments has the same operational effects, and the same reference numerals are given and description thereof is omitted. Therefore, only different parts will be described.

  The structural feature of the storage of the present embodiment is that the food storage space has a deoxygenation auxiliary container connection part opening / closing means. The storage method is characterized in that the food storage space in which the oxygen concentration is adjusted is detached from the deoxygenation auxiliary container and stored.

  Below, the structure and storage method of this storage are demonstrated using FIG.9 and FIG.10.

  FIG. 9 is a cross-sectional view of the food storage space of the present embodiment. This food storage space is similar to the food storage space shown in FIG. 6 of the third embodiment, except that it has a deoxygenation auxiliary container connection part opening / closing means 19. The deoxygenation auxiliary container connection part opening / closing means 19 has an action of blocking the deoxygenation auxiliary container connection part 17 from the outside and stopping gas from entering and exiting the outside. Specifically, in addition to a solenoid valve, a valve using air pressure, a switch, etc., a stopper that is fixed by being manually fitted or screwed in is also used.

  FIG. 10 is a cross-sectional view showing a food storage space in which the oxygen concentration in the refrigerator as a storage in this embodiment can be adjusted and a storage method using the food storage space.

  FIG. 10 shows a structure in which two food storage spaces 10 can be connected to the deoxygenation auxiliary container 8 as in FIG. 8, but the food storage space 10 opens and closes the deoxygenation auxiliary container connection part described in FIG. 9. It is characterized by having means 19. FIG. 10 shows a state in which the food storage space 10 in the lower upper part of the refrigerator is detached from the deoxygenation auxiliary container 8 and is moved from the upper lower part of the storage to the upper part of the storage and stored.

  This storage method will be described below. First, prior to storage, the oxygen concentration in the food storage space 10 is adjusted according to Step 1 and Step 2, and this method is the same as that in the fourth embodiment. However, since the food storage space 10 has the deoxygenation auxiliary container connection part opening / closing means 19, in order to introduce the gas whose oxygen concentration is adjusted from the deoxygenation auxiliary container 8, the deoxygenation auxiliary container connection part It is necessary to open the opening / closing means 19. The timing for opening the deoxygenation auxiliary container connection part opening / closing means 19 is before the food storage space 10 is connected to the deoxygenation auxiliary container 8 or before the start of step 3.

  After finishing up to step 3, in Embodiments 1-4, it was stored as it was connected to the deoxygenation auxiliary container 8, but in this embodiment, as shown in FIG. Is desorbed from the deoxidation auxiliary container 8 and stored elsewhere in the refrigerator. What is important here is that before the food storage space 10 is desorbed from the deoxygenation auxiliary container 8, the deoxygenation auxiliary container connection part opening / closing means 19 is closed to block gas from entering and exiting the outside.

  Thus, by adjusting the oxygen concentration using the food storage space having the deoxygenation auxiliary container connection part opening / closing means, the food storage space can be detached from the oxygen storage auxiliary container and stored while maintaining the oxygen concentration. Furthermore, the effect of realizing oxygen concentration adjustment in many food storage spaces can be obtained by repeating the oxygen concentration adjustment in another food storage space and the desorption from the deoxygenation auxiliary container.

  Here, the case where the food storage space is covered with the gas barrier film corresponding to FIG. 6 of the third embodiment has been described, but the sealed food corresponding to FIG. 1 of the first embodiment is used. Of course, it is also possible to use a food storage space formed by a storage container.

  Hereinafter, the present invention will be described based on specific examples. In addition, this invention is not limited by this Example.

Example 1
In this example, the oxygen concentration in the food storage space 10 was reduced using the food storage container 9 of FIG.

  The polymer solid electrolyte membrane 12 of the oxygen concentration adjusting means 5 is a perfluorocarbon sulfonic acid membrane having a thickness of about 200 μm, and the cathode 13 is formed by pressure-molding a mixture of carbon powder carrying platinum on the surface and fluororesin powder. A porous electrode having appropriate water repellency was used. The anode 14 was a platinum black layer formed directly on the polymer solid charge 12. As the power supply 15, a cloth made of carbon fiber was used for the cathode, and mesh-like titanium whose surface was platinum-plated was used for the anode.

  This oxygen concentration adjusting means 5 has an ability to remove about 170 ml of oxygen on the cathode 13 side per hour and generate the same amount of oxygen on the anode 14 side in an atmosphere of temperature 25 ° C. and humidity 60%. It was. This ability is obtained by measuring the oxygen concentration in the two bags when both sides of the oxygen concentration adjusting means 5 are connected to two bags having gas barrier properties and a voltage of 2.8 V is applied to the supply electrode 15. confirmed. The oxygen concentration was determined by quantifying the amount of oxygen using a gas chromatogram.

  The food storage container 9 shown in FIG. 1 has an internal volume of 1 L, and the deoxygenation auxiliary container 8 has an internal volume of 3 L. The deoxygenation auxiliary container 8 has a structure having a thickness so as to withstand pressure reduction during deoxygenation.

  Further, as the deoxygenated gas introducing means 6 and the external gas replacing means 7, both electromagnetic valves were used. In the initial state, both were closed.

  First, as step 1, with the above-described configuration, 200 ml of beef minced meat is placed in the food storage space and stored in an atmosphere of 5 ° C., the external gas replacement means 7 is opened, and the oxygen-deoxygenation auxiliary container is used with external air. 8 was replaced. Next, as Step 2, the external gas replacement unit 7 was closed, and a voltage of 2.8 V was applied to the cathode 13 and the anode 14 of the oxygen concentration adjusting unit 5. This time was determined from the charge amount as follows. In other words, the inside of the deoxygenation auxiliary container 8 is deoxygenated in advance under the above voltage condition, and the sum of current values (charge amount) at which the oxygen concentration becomes 2% is obtained. Stopped. The voltage application was canceled when the same amount of electric charge was reached even in the following changes in the amount of beef minced meat.

  Next, as a third step, the deoxygenated gas introduction means 6 is opened, the deoxygenated gas in the deoxygenation auxiliary container 8 is introduced into the food storage space 10 and homogenized, and then the oxygen concentration and hydrogen concentration are adjusted to the gas chromatograph. Measured by togram.

  Further, in the same manner as described above, the same operation was performed when 100 ml and 300 ml of beef minced meat were stored.

(Comparative Example 1)
For comparison, in the case where there is no deoxygenation auxiliary container, the oxygen concentration adjusting means is arranged directly on the food storage container having the same volume as that of the embodiment to directly deoxygenate the food storage space in the food storage container. Carried out. The charge amount at the time of deoxygenation does not depend on the amount of beef minced meat. When 200 ml of beef minced meat is stored in a food storage container, the charge amount when the oxygen concentration reaches 2% is used as a standard. When the charge amount was reached, the voltage application to the oxygen concentration adjusting means was released. In addition, a pinhole having a diameter of 1 mm was opened in the food storage container so that the inside was not depressurized, and sampling at the time of gas chromatogram measurement was also performed from this pinhole.

  In the examples, the (oxygen concentration, hydrogen concentration) corresponding to beef minced meat 100 ml, 200 ml, and 300 ml are (6.4%, 0%), (6%, 0%), (5.6%, 0%). On the other hand, in the comparative example, they were (4.5%, 0%), (2.1%, 0%), (0.2%, 4.1%).

  Thus, in the examples, the oxygen concentration was constant and hydrogen was not generated regardless of the amount of beef minced meat. On the other hand, in the comparative example, although the oxygen concentration was somewhat low, the fluctuation of the oxygen concentration depending on the amount of beef minced meat was large, and generation of hydrogen was observed when the amount of beef minced meat increased.

  This is considered to be due to the following reason.

  In the embodiment, even if the amount of beef minced meat changes and the volume of the food storage space changes, deoxidation always results in a certain amount of oxygen, so voltage is applied to the oxygen concentration adjusting means. In this case, hydrogen ions do not become excessive and hydrogen is not generated as a result. On the other hand, in the comparative example, since the food storage space is directly deoxygenated, if the amount of beef minced meat changes, the amount to be deoxygenated may change, resulting in an excessive amount of hydrogen ions. Occurs.

  Thus, it has been found that by using the configuration of the present invention, generation of hydrogen can be avoided and the oxygen concentration in the food storage space can be increased safely.

(Example 2)
In this example, the oxygen concentration adjusting tray 16 and the gas barrier film 18 shown in FIG.
Was used to reduce the oxygen concentration in the food storage space of FIG. As the gas barrier film 18, a polyvinylidene chloride film having a film thickness of 11 μm was used. The same deoxygenation auxiliary container 8 and oxygen adjusting means 5 as in Example 1 were used.

  First, the oxygen concentration adjusting tray 16 shown in FIG. 6 was taken out, beef minced meat was placed thereon, covered with a gas barrier film 18, and connected to the deoxygenation auxiliary container 8. Although omitted in FIG. 6, the gas barrier film 18 was brought into close contact with the oxygen concentration adjusting tray 16 by using a band-shaped fastening jig made of rubber to suppress gas leakage.

  Thereafter, as in Example 1, the oxygen concentration of the food storage space 10 was adjusted according to the operation, and the oxygen concentration and the hydrogen concentration were measured.

  Corresponding to beef minced meat 100ml, 200ml, 300ml (oxygen concentration, hydrogen concentration) in order (2.3%, 0%), (2.6%, 0%), (3.0%, 0%) )Met.

  Thus, in Example 2, the oxygen concentration was lower than that in Example 1. In addition, generation of hydrogen was avoided as in Example 1.

  In this way, the generation of hydrogen was avoided, as in Example 1, since deoxygenation is always a certain amount of oxygen in the deoxygenation auxiliary container, so that hydrogen ions corresponding to the oxygen amount are supplied in advance. This is probably because excess hydrogen ions were not generated. The reason why the oxygen concentration is low is considered to be as follows. By covering the beef minced meat with the gas barrier film, the volume to be deoxygenated (volume of the food storage space) is greatly reduced. For this reason, when the deoxygenated gas is introduced from inside the deoxygenation auxiliary container, the influence of the food storage space is reduced, almost equal to the oxygen concentration in the deoxygenation auxiliary container, and the low oxygen concentration can be adjusted accurately. It became.

Example 3
In this example, the oxygen concentration adjustment tray 16 having the deoxygenation auxiliary container connection part opening / closing means 19 shown in FIG. 9 of the fourth embodiment is used, and the two food storage spaces 10 are connected to the deoxygenation auxiliary container 8. Then, the oxygen concentration in the two food storage spaces 10 was adjusted at the same time, and then the food storage space 10 was detached from the deoxygenation auxiliary container 8 and stored. The same gas barrier film 18 and oxygen adjusting means 5 as those in Example 2 were used. Although not shown in FIG. 10, the gas barrier film 18 was brought into close contact with the oxygen concentration adjusting tray 16 by using a belt-like fastening jig made of rubber to suppress gas leakage.

  Further, the volume of the deoxygenation auxiliary container was 3 L as in Example 1. As the deoxygenation auxiliary container opening / closing means 19, a screw-type stopper-like opening / closing means was used.

  First, two oxygen concentration adjusting trays 16 shown in FIG. 9 are prepared, 150 ml of beef minced meat and tuna sashimi are placed on each of them, and further covered with a gas barrier film 18, and these are deoxidized auxiliary containers 8. Connected to each. At this time, each of the deoxygenation auxiliary container connection part opening / closing means 19 was opened and connected to the deoxygenation auxiliary container 8. Thereafter, the oxygen concentration of the two food storage spaces 10 was adjusted according to the same operation as in Example 1, and the oxygen concentration and the hydrogen concentration were measured.

  In addition, two new oxygen concentration adjustment trays 16 are prepared, and the oxygen concentrations in the two food storage spaces in which beef mince and tuna sashimi are set are adjusted in the same manner as described above, and are removed from the deoxygenation auxiliary container 8. Stored. In this regard, the oxygen concentration and the hydrogen concentration were similarly measured.

The initial oxygen concentration and hydrogen concentration corresponding to the two food storage spaces 10 prepared first were (2.9%, 0%) and (3.1%, 0%) in this order. The oxygen concentration and hydrogen concentration after 3 days were (5.9%, 0%) and (6.0%, 0%) in this order.

  Moreover, the initial oxygen concentration and hydrogen concentration corresponding to the two food storage spaces 10 produced later were (2.8%, 0%) and (3.0%, 0%) in this order. The oxygen concentration and hydrogen concentration after 3 days were (6.0%, 0%) and (6.1%, 0%) in this order.

  Thus, it became possible to adjust the oxygen concentration in many food storage spaces while avoiding the generation of hydrogen. The generation of hydrogen was avoided, as in the case of Examples 1 and 2, because deoxygenation is always a certain amount of oxygen in the deoxygenation auxiliary container, so that hydrogen ions corresponding to the oxygen amount in advance This is probably because excessive hydrogen ions were not generated. In addition, the oxygen concentration in many food storage spaces can be adjusted because the two food storage spaces can be connected to a deoxygenation auxiliary container. This is because it is now possible to adjust the oxygen concentration, and since the food storage space has a means for opening and closing the deoxygenation auxiliary container connection part, the adjusted oxygen concentration even when desorbed from the deoxygenation auxiliary container This is because is now maintained.

  Thus, it has been found that by using the configuration of the present invention, generation of hydrogen can be avoided and the oxygen concentration in the food storage space can be reduced more efficiently.

  As described above, the storage room for adjusting the oxygen concentration according to the present invention enables safe high-quality long-term storage of vegetables, meat, etc., so that a refrigerator that stores food regardless of business use or home use. It can be applied to storages such as refrigerators that store oxygen-sensitive chemicals, medical materials, and chemical substances.

Sectional drawing which showed the food storage space which can adjust the oxygen concentration in the refrigerator in Embodiment 1, 2 of this invention The figure which showed the procedure of oxygen concentration adjustment in Embodiment 1, 3 of this invention Sectional drawing of the oxygen concentration adjusting means in Embodiment 1, 2, and 3 of this invention The figure which showed the procedure of oxygen concentration adjustment in Embodiment 2, 3 of this invention The figure which showed the change of the oxygen concentration of the food preservation space in Embodiment 2 of this invention Sectional drawing which showed the food storage space which can adjust the oxygen concentration in the refrigerator in Embodiment 3 of this invention (A) Sectional drawing which showed the oxygen concentration adjustment tray in Embodiment 3 of this invention, (b) Sectional drawing of the AA line position of the oxygen concentration adjustment tray Sectional drawing which showed the food storage space which can adjust the oxygen concentration in the refrigerator in Embodiment 4 of this invention Sectional drawing which showed the food preservation space in Embodiment 5 of this invention Sectional drawing of the refrigerator which showed the storage method of the food preservation space in Embodiment 5 of this invention

DESCRIPTION OF SYMBOLS 1 Storage room door 2 Heat insulation partition wall 3 Main body heat insulation wall 4 Partition plate 5 Oxygen concentration adjustment means 6 Deoxygenation gas introduction means 7 External gas replacement means 8 Deoxygenation auxiliary container 9 Food preservation container 10 Food preservation space 11 Frame 12 Polymer solid Electrolyte membrane 13 Cathode 14 Anode 15 Feeding electrode 16 Oxygen concentration adjusting tray 17 Deoxygenation auxiliary container connection portion 18 Gas barrier film 19 Deoxygenation auxiliary vessel connection portion opening / closing means

Claims (10)

A storage having oxygen concentration adjusting means comprising a solid polymer electrolyte membrane having hydrogen ion conductivity sandwiched between an anode and a cathode, wherein the oxygen concentration adjusting means, external gas replacement means, and deoxygenated gas introducing means A storage container capable of adjusting the oxygen concentration of the food storage space, characterized by comprising: a deoxygenation auxiliary container comprising: a deoxygenation auxiliary container; and a desorbable food storage space. The storage room capable of adjusting the oxygen concentration of the food storage space according to claim 1, wherein the food storage space is formed by sealing an upper portion of the oxygen concentration adjusting tray with a gas barrier film. A deoxygenation auxiliary container comprising an oxygen concentration adjusting means comprising a solid polymer electrolyte membrane having hydrogen ion conductivity sandwiched between an anode and a cathode, an external gas replacement means, and a deoxygenation gas introducing means; A method for adjusting the oxygen concentration of a food storage space using a storage having an auxiliary container and a detachable food storage space, wherein as a first step, using the external gas replacement means, Replacing the gas with the non-deoxygenated gas outside the container, as a second step, adjusting the oxygen concentration in the deoxygenation auxiliary container by applying a voltage to the oxygen concentration adjusting means, as a third step, A method for adjusting the oxygen concentration in a food storage space, wherein the gas in the deoxygenation auxiliary container is introduced into the food storage space through a deoxygenation gas introducing means. The method for adjusting the oxygen concentration in a food storage space according to claim 3, wherein the first step, the second step, and the third step are repeated in order several times. The storage room capable of adjusting the oxygen concentration of the food storage space according to claim 1, wherein a plurality of food storage spaces are connected to the deoxygenation auxiliary container at the same time. 6. The storage room capable of adjusting the oxygen concentration of a food storage space according to claim 1, wherein the food storage space has a deoxygenation auxiliary container connection part opening / closing means. The method for adjusting the oxygen concentration in a food storage space according to any one of claims 3 and 4, which is carried out by connecting a plurality of food storage spaces to a deoxygenation auxiliary container. A deoxygenation auxiliary container comprising an oxygen concentration adjusting means comprising a solid polymer electrolyte membrane having hydrogen ion conductivity sandwiched between an anode and a cathode, an external gas replacement means, and a deoxygenation gas introducing means; An auxiliary container and a detachable food storage space, and the food storage space further includes a storage box having the deoxygenation auxiliary container connection part opening / closing means, and as the first step, using the external gas replacement means The oxygen in the deoxygenation auxiliary container is replaced with the gas that has not been deoxygenated outside the container, and as a second step, the oxygen concentration in the deoxygenation auxiliary container is changed by applying a voltage to the oxygen concentration adjusting means. As a third step, after adjusting the oxygen concentration of the food storage space by introducing the gas in the deoxygenation auxiliary container into the food storage space through the deoxygenation gas introducing means, the food storage space Close the deoxygenation auxiliary container connection part by deoxygenation auxiliary container connecting portion opening and closing means, subsequently storing method for storing oxygen concentration adjusted food storage space by detaching the food storage space from deoxygenation auxiliary container. The food storage space storage method according to claim 8, wherein the oxygen concentration is adjusted by repeating the first step, the second step, and the third step a plurality of times in order. The food storage space storage method according to claim 8 or 9, wherein a plurality of food storage spaces are simultaneously connected to the deoxygenation auxiliary container.