JP2004105332A - Boiled rice warmer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide delicious boiled rice even if the boiled rice is warmed by inhibiting yellowing and deterioration of the physical properties of the boiled rice in tasting. <P>SOLUTION: The boiled rice warmer comprises a nitrogen feeding means 15 for removing oxygen included in the atmosphere and feeding nitrogen-rich gas, gas transporting means 16a and 16b for transporting the gas, a nitrogen storing means 17 for storing the nitrogen-rich gas, and a control means 6 for controlling the feed quantity of nitrogen to be fed by using the nitrogen feeding means 15 and the gas transporting means 16a and 16b. Since the nitrogen feeding means 15 feeds nitrogen-rich air into an inner pot 1 via the nitrogen storing means 17, unpleasant smell of warmed rice generated inside the inner pot 1 is dispersed. As a result, yellowing of the rice and deterioration of the physical properties of the boiled rice in tasting can be inhibited, to provide the delicious boiled rice, even if warmed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a cooked rice warmer that suppresses yellowing of cooked rice and deterioration of physical properties at the time of eating, and can obtain delicious cooked rice even when kept warm.
[0002]
[Prior art]
Conventionally, as this type of cooked rice warmer, there is known a rice cooker provided with a decompression device for decompressing air in an inner pot (rice cooker) and a gas separation membrane for passing only oxygen in the air (for example, see Patents). Reference 1).
[0003]
This is equipped with a gas separation membrane that allows only oxygen in the air to pass before the decompression device, and by operating the decompression device, the air in the inner pot is discharged to the outside through the gas separation membrane, and the inner It reduces the absolute amount of oxygen. This prevents yellowing of cooked rice and the generation of a warm smell during the warming.
[0004]
[Patent Document 1]
JP-A-5-154039
[Problems to be solved by the invention]
However, in the conventional rice cooker, the air in the inner pot is discharged by the decompression device, and the inner pot is required to have a high degree of hermeticity. Difficult and not suitable for general household use.
[0006]
The present invention solves the above-mentioned conventional problems, and provides a rice cooker that suppresses yellowing of rice and deterioration of physical properties at the time of eating by nitrogen-enriched air, and provides delicious cooked rice even when kept warm. The purpose is to do.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the cooked rice warmer of the present invention is a nitrogen supply means for removing oxygen contained in the atmosphere and supplying a nitrogen-enriched gas, and a nitrogen storage means for storing the nitrogen-enriched gas. And control means for controlling the amount of nitrogen supply, and the control means controls the amount of supply of the nitrogen-rich gas from the nitrogen storage means to the inner kettle.
[0008]
As a result, the unpleasant heat retention odor generated in the inner pot due to the supply of nitrogen-enriched gas can be scattered, and yellowing of rice and deterioration of physical properties at the time of eating can be suppressed. Can be provided.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
According to the first aspect of the present invention, an inner pot for storing rice, an openable / closable lid provided above the inner pot, heating means for heating the rice in the inner pot, and detecting a temperature of the inner pot Temperature detecting means, nitrogen supply means for removing oxygen contained in the atmosphere and supplying a nitrogen-enriched gas to the inner kettle, nitrogen storage means for storing the nitrogen-enriched gas from the nitrogen supply means, Control means for controlling the heating of the cooked rice to a predetermined temperature using the heating means based on the detection value of the temperature detection means, and for controlling a supply amount of nitrogen-rich gas from the nitrogen storage means to the inner pot; By dispersing the unpleasant heat odor generated in the inner pot by the supply of nitrogen-enriched gas by controlling the rice cooker with Can provide delicious rice even when kept warm
[0010]
The invention according to claim 2 is characterized in that a valve is provided between the nitrogen supply means, the inner pot and the nitrogen storage means, and the rice valve is isolated from the nitrogen supply means by the valve during rice cooking. Since the steam generated by cooking rice does not condense on the nitrogen supply means, etc., it is possible to maintain the nitrogen supply capacity for a long period of time, and there is no decay of dew condensation water, and the rice cooker is kept clean for a long time can do.
[0011]
The invention according to claim 3 is provided with a valve between the nitrogen supply means, the inner pot, and the nitrogen storage means. During the rice cooking, the valve connects the nitrogen supply means with the nitrogen storage means. The rice cooker according to claim 1, wherein the nitrogen storage means and the inner pot are connected to each other to supply the nitrogen-enriched gas stored in the nitrogen storage means to the inner pot after cooking the rice. The oxygen concentration can be rapidly reduced. For this reason, the oxygen concentration in the inner pot can be kept low, and the heat retention odor and yellowing of the cooked rice can be prevented, and the deterioration of taste can be prevented.
[0012]
The invention according to claim 4 includes a valve provided between the nitrogen supply means, the inner pot, and the nitrogen storage means, and an open / close detection means for detecting opening / closing of the lid, and the lid is opened by the open / close detection means. When it is detected, the valve connects the nitrogen supply means and the nitrogen storage means, and when the open / close detection means detects that the lid is closed, the valve connects the nitrogen storage means to the inner pot. When the oxygen concentration in the inner pot is increased by opening and closing the lid, the nitrogen-rich gas stored in the nitrogen storage means is supplied to the inner pot by using the cooked rice warmer according to claim 1. The oxygen concentration in the kettle can be quickly reduced. For this reason, the oxygen concentration in the inner pot can be kept low, and it is possible to prevent the odor and yellowing of the cooked rice while keeping it warm, and to prevent a decrease in taste.
[0013]
The invention according to claim 5, wherein the nitrogen supply means includes a solid electrolyte having oxygen ion conductivity, a pair of electrodes formed on different surfaces of the solid electrolyte, and a voltage connected between the pair of electrodes. A supply device, a heater that heats the solid electrolyte, a heater power supply that supplies a voltage to the heater, and a heat insulating material provided around the solid electrolyte and the heater, and oxygen contained in external air is provided. The rice cooker according to claim 1, which is removed and discharged to the outside and supplies the remaining nitrogen-enriched gas to the inner kettle, wherein only oxygen contained in the outside air is produced by the oxygen pumping action of the solid electrolyte. Efficiently eliminates lipids, proteins, and carbohydrates in cooked rice from oxidizing with oxygen in the air and decomposing or polymerizing these substances. Reduction, it is possible to reduce the occurrence of thermal insulation odor.
[0014]
In addition, the oxygen pumping action of the solid electrolyte efficiently removes only oxygen contained in the external air, supplies nitrogen-enriched gas, and reduces the oxygen concentration in the inner kettle, thus suppressing the activity of bacteria. Yes, it can delay the rot of cooked rice.
[0015]
According to a sixth aspect of the present invention, the cooked rice warmer according to the fifth aspect further includes a sealing material for hermetically separating different spaces in which a pair of electrodes are formed, so that the space is separated by one electrode (cathode). The nitrogen-enriched air can be separated from the oxygen released from the other electrode (anode) without mixing, and a nitrogen-enriched gas can be supplied efficiently.
[0016]
According to a seventh aspect of the present invention, the heat insulation material is porous and air-permeable, and the rice cooker according to the fifth aspect allows gas to sufficiently flow out and in between the outside and the pair of electrodes. The transfer of oxygen is performed without delay, and a nitrogen-enriched gas can be supplied efficiently.
[0017]
According to an eighth aspect of the present invention, the heater can be embedded in a heat insulating material, so that the nitrogen supply means can be reduced in size.
[0018]
According to a ninth aspect of the present invention, there is provided a current detecting means for detecting a current flowing through the solid electrolyte, and the control means self-diagnoses a state of the nitrogen supply means based on a detection value of the current detecting means. In the rice cooker according to any one of items 1 to 8, when the detection value of the current detection means exceeds a preset threshold, the solid electrolyte of the nitrogen supply means, the pair of electrodes or the heater may be deteriorated. It is possible to determine the period during which delicious rice can be provided, to prompt the exchange of the nitrogen supply means, or to inform the user of the life.
[0019]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
FIG. 1 shows a jar rice cooker incorporating a cooked rice warmer according to an embodiment of the present invention. In the figure, reference numeral 1 denotes an inner pot provided in the main body 2, which stores a predetermined amount of cooked rice and water and performs heating cooking. At the bottom of the inner pot 1, a temperature detecting means 4 for detecting the temperature of the inner pot 1 is provided so as to be in contact with the inner pot 1, and a heating means comprising an electromagnetic induction heating coil for heating the inner pot 1 is provided. 5 are provided.
[0021]
6 controls the heating of the cooked rice to a predetermined temperature using the heating means 5 based on the detection value of the temperature detection means 4 and controls the supply amount of the nitrogen-rich gas from the nitrogen storage means (described later) to the inner pot 1. It is a control means for controlling and includes a high frequency power supply for supplying electric power to the heating means 5.
[0022]
Numeral 7 is a heating means for keeping heat provided on the upper side of the inner pot 1.
[0023]
Reference numeral 8 denotes an openable and closable lid provided above the inner pot 1, and a radiating plate 9 below the lid is provided with a heating means 10 for the lid and a temperature detecting means 11 for the lid for detecting the temperature of the inner pot 1. Have been. The heating of the heating means 7 is controlled by the control means 6, and the value detected by the temperature detecting means 11 is inputted to the control means 6.
[0024]
Further, the lid 8 is provided with a nitrogen supply means 15 for removing oxygen contained in the atmosphere and supplying a nitrogen-enriched gas, a gas transportation means 16a and 16b including a pump and a fan for transporting the gas, and a nitrogen-enrichment means. Nitrogen storage means 17 for storing various gases is provided. By operating the gas transport means 16a or 16b to discharge the internal gas from the inner pot 1 or the nitrogen storage means 17 as shown by the arrow a, external air is supplied through the opening of the lid 8 as shown by the arrow b. It is led to the means 15, separated into nitrogen and oxygen by the nitrogen supply means 15, and the oxygen is again released from the opening through the nitrogen supply means 15 to the outside as shown by an arrow c.
[0025]
On the other hand, the separated nitrogen is again mixed with the atmosphere to become a nitrogen-enriched gas, and is guided into the inner pot 1 or the nitrogen storage means 17 by the gas transport means 16a or 16b, respectively. The inside of the inner pot 1 is promptly replaced with a nitrogen-enriched gas by the nitrogen supply means 15 or the nitrogen storage means 17, and the gas containing high-concentration oxygen existing in the inner pot 1 is opened by the gas transport means 16a. Emitted to the atmosphere through The opening for discharging gas in the inner pot 1 to the atmosphere also serves as a steam vent during cooking rice.
[0026]
Further, a check valve is provided to prevent a gas containing high-concentration oxygen from flowing back from the inner pot 1 to the nitrogen supply means 15, and a valve 18 is provided between the nitrogen supply means 15 and the nitrogen storage means 17 and the inner pot 1. Is provided so that the nitrogen supply means 15 and the inner pot 1 can be isolated.
[0027]
Therefore, since steam and rice cake generated by cooking rice do not adhere to the nitrogen supply means 15 and the gas transport means 16b, the nitrogen supply capacity can be maintained for a long time, and water condensed on the piping and the nitrogen supply means 15 can be removed. It does not accumulate, hardly causes decay and the like, and the rice cooker can be kept clean for a long time. At the same time, the oxygen concentration in the inner pot 1 can be efficiently and always kept low.
[0028]
An operation panel section 12 is provided above the lid 8, and an opening / closing detecting means 19 is provided at a place where the main body 2 and the lid 8 are in contact with each other. The open / close detecting means 19 is constituted by a reed switch or the like, and the control means 6 detects the open / close state of the lid 8 based on the information of the open / close detecting means 19.
[0029]
In this figure, connection of power supply lines, signal lines, and the like is omitted. In this cooked rice incubator, after cooking rice, the temperature of the cooked rice being kept warm is detected by the temperature detecting means 4 in contact with the bottom of the inner pot 1. This information is sent to the control means 6, and electric power is supplied to the heating means 5 so that the temperature of the cooked rice will be 72 ° C., which is the heat retention set temperature, to generate a magnetic force, and the cladding material is made of stainless steel and aluminum. The stainless steel layer of the inner pot 1 is heated by electromagnetic induction to keep cooked rice warm.
[0030]
Further, the control means 6 electronically controls the input of the heating means 7 and 10 so that a heating amount corresponding to the amount of cooked rice is given to keep the cooked rice temperature at the heat retention set temperature of 72 ° C.
[0031]
Further, the control means 6 controls the nitrogen supply means 15, the valve 18 and the gas transport means 16a, 16b, and continuously supplies the nitrogen-enriched gas or intermittently supplies the nitrogen-enriched gas at regular time intervals. It can disperse the heat retention odor, suppress yellowing of cooked rice and decrease in physical properties at the time of eating, and provide delicious cooked rice even when the lid 8 is closed for a long time. That is, during rice cooking, the nitrogen supply means 15 and the inner pot 1 are isolated by the valve 18.
[0032]
During rice cooking, the nitrogen supply means 15 and the nitrogen storage means 17 are electrically connected by the valve 18, and after the rice cooking is completed, the nitrogen storage means 17 and the inner pot 1 are electrically connected by the valve 18. Further, when the opening / closing detection means 19 detects that the lid 8 has been opened, the valve 18 connects the nitrogen supply means 15 and the nitrogen storage means 17 to each other, and the opening / closing detection means 19 detects that the lid 8 is closed. Upon detection, the valve 18 allows the nitrogen storage means 17 to communicate with the inner pot 1.
[0033]
During these operations, the gas transport means 16a and 16b are controlled appropriately.
[0034]
Next, the nitrogen supply means 15 will be described with reference to FIG. This comprises a solid electrolyte 20 having oxygen ion conductivity, a pair of electrodes 21 and 22 formed on different surfaces of the solid electrolyte 20, and a voltage supply device 23 connected between the pair of electrodes 21 and 22. A heater 24 for heating the solid electrolyte 20, a heater power supply 25 for supplying a voltage to the heater 24, and a heat insulating material 26 provided around the solid electrolyte 20 and the heater 24. The oxygen contained in the air is removed and discharged outside, and the remaining nitrogen-rich gas is supplied to the inner pot 1. The solid electrolyte 20 and the pair of electrodes 21 and 22 constitute an oxygen pump. FIG. 3 shows the voltage-current characteristics of the oxygen pump.
[0035]
Further, the heat insulating material 26 is provided for efficiently heating the solid electrolyte 20 by the heater 24. The heater 24 is embedded in the heat insulating material 26 and is integrally formed, so that the nitrogen supply means 15 can be downsized. I am wearing it.
[0036]
Further, since the heat insulating material 26 is porous and has air permeability, the gas flows in and out sufficiently, and the transfer of oxygen between the outside and the pair of electrodes 21 and 22 is performed without delay, so that the nitrogen-rich material is efficiently formed. Gas can be supplied.
[0037]
In addition, a sealing material 27 is provided to hermetically separate different spaces in which the pair of electrodes 21 and 22 are formed, and the solid electrolyte 20 is hermetically fixed to the heat insulating material 26 and the metal housing. Since the nitrogen-enriched air separated at the electrode 21 (cathode) and the oxygen released from the other electrode 22 (anode) are separated without mixing, the nitrogen-enriched gas can be supplied efficiently. I can do it.
[0038]
A disk made of lanthanum gallium oxide having oxygen ion conductivity and having a diameter of about 20 mm and a thickness of 1 mm is used as the solid electrolyte 20, and a paste made of perovskite oxide is printed as a pair of electrodes 21 and 22 on both surfaces of the disk. Further, a current collector was further laminated thereon, and a sealing material 27 made of a metal foil and a lead wire were attached and fired in an electric furnace. For the solid electrolyte 20, other stabilized zirconia having oxygen ion conductivity, stabilized ceria, and the like can also be used. In order to improve the oxygen ion conductivity of the lanthanum gallium oxide used in the examples, lanthanum sites and A part of the gallium site may be substituted with a different metal such as a transition metal or an alkaline earth metal.
[0039]
Further, a current detecting means 28 for detecting a current flowing through the solid electrolyte 20 was connected between the voltage supply device 23 and the solid electrolyte 20. When the solid electrolyte 20, the pair of electrodes 21, 22 or the heater 24 is deteriorated due to a cause such as dropping or deterioration of durability, the current flowing through the solid electrolyte 20 changes. The control means 6 performs a self-diagnosis of the state of the nitrogen supply means 15, and when the detection value of the current detection means 28 exceeds a preset threshold, determines a period during which delicious rice can be provided, and replaces the nitrogen supply means 15. It can prompt you or inform you of your lifespan.
[0040]
The air taken in from the outside and supplied to the nitrogen supply means 15 reaches one electrode 21 (cathode) via a porous heat insulating material 26, and oxygen contained in the air is adsorbed on the cathode 21. Then, when a voltage is applied between the pair of electrodes 21 and 22 by the voltage supply device 23, the adsorbed oxygen receives electrons, and a solid phase is formed from a three-phase interface formed between the electrode 21, the solid electrolyte 20, and the gas phase. The oxygen ions are taken into the electrolyte 20 and move into the solid electrolyte 20 as oxygen ions. Oxygen ions reaching the other electrode 22 (anode) emit electrons at a three-phase interface formed between the electrode 22, the solid electrolyte 20, and the gas phase, become oxygen again, and are discharged to the atmosphere.
[0041]
The nitrogen-enriched gas from which oxygen has been removed is supplied to the inner pot 1 by the operation of the gas transport means 16a or 16b, and is replaced with a gas containing high-concentration oxygen. Is discharged. As a result, the inside of the inner pot 1 has a low oxygen concentration, and the lipids, proteins, and carbohydrates in the cooked rice are prevented from oxidizing with oxygen in the air, and the decomposition or polymerization of these substances is suppressed. Yellowing and generation of heat retention odor can be reduced. In addition, the activity of bacteria can be suppressed, and the putrefaction of cooked rice can be delayed.
[0042]
Using the cooked rice warmer configured as described above, the warmed state of cooked rice was examined. First, rice and water, which are ingredients of cooked rice, were put into the inner pot 1 and cooked. Further, while cooking rice at the same time, power of 10 to 20 W is supplied to the heater 24 of the nitrogen supply means 15 using the heater power supply 25, and the operating temperature of the oxygen pump composed of the solid electrolyte 20 and the pair of electrodes 21 and 22 is increased. Was heated to 600 to 700 ° C.
[0043]
Then, a predetermined voltage was supplied between the pair of electrodes 21 and 22 by the voltage supply device 23, and the gas transport unit 16 b was operated to take in the nitrogen-enriched gas into the nitrogen storage unit 17. The nitrogen supply amount can be changed by controlling the voltage supply device 23 and the gas transport means 16b. The oxygen concentration in the nitrogen storage means 17 immediately after the cooking was about 2%.
[0044]
Although the oxygen concentration of the gas in the inner pot 1 immediately after the cooking was almost 0%, the inside was cooled down, the saturated vapor pressure was lowered, and air flowed in from the outside, and the oxygen concentration was gradually increased.
[0045]
Therefore, the control means 6 operates the valve 18 and the gas transport means 16a, which have isolated the inner pot 1, so that the nitrogen-enriched gas having a sufficiently low oxygen concentration stored in the nitrogen storage means 17 can be stored in the inner pot 1. Quickly introduced.
[0046]
FIG. 4 shows the relationship between the heat retention time and the oxygen concentration in the inner kettle 1 when the air in the inner kettle 1 is replaced with a nitrogen-enriched gas by the nitrogen supply means 15 and the nitrogen storage means 17. Oxygen separated by the oxygen pump is discharged to the outside at 10 to 30 cc / min, and the separated nitrogen is mixed again with air to become a nitrogen-enriched gas. Supplied to When the valve 18 communicates the nitrogen storage means 17 with the inner pot 1, the air in the inner pot 1 is promptly replaced with nitrogen-enriched gas, and the oxygen concentration in the inner pot 1 becomes 2 to 4% in 20 to 60 minutes. Therefore, the supply amount of nitrogen was reduced and kept as it was. After a while, the oxygen concentration in the inner pot 1 increased due to the inflow of the external air, but the oxygen concentration in the inner pot 1 was quickly reduced by increasing the nitrogen supply amount again at a low concentration stage to some extent. Was completed.
[0047]
At this time, the inside of the inner pot 1 was almost at atmospheric pressure, and it was found that the hermetic construction was simple and sufficient.
[0048]
Next, immediately after cooking, sensory evaluation was performed when the oxygen concentration in the inner pot 1 was maintained at 2 to 4%. When kept in the atmosphere, cooked rice was slightly oxidized, and the evaluation of the warm odor and taste was low. On the other hand, when kept at a low oxygen concentration, the warm odor was little and the taste was good.
[0049]
Further, in this state, the sensory evaluation of cooked rice kept for 12 hours and 24 hours showed that all of them had little heat retention odor, had a freshly cooked odor, had little yellowing, had good taste evaluation, and had elasticity. And the overall evaluation was high. On the other hand, cooked rice kept warm for 12 hours and 24 hours in the air all had a strong warming odor, yellowing occurred, taste was poor, and the overall evaluation was low.
[0050]
Next, the heat retention state of the cooked rice when the lid 8 was opened and closed was examined. While the lid 8 is closed, the nitrogen supply means 15 supplies a nitrogen-enriched gas to the nitrogen storage means 17, and immediately after the lid 8 is opened, the oxygen concentration in the inner pot 1 is the oxygen concentration in the atmosphere. Became 20.8%. When the lid 8 was closed, the open / close detection means 19 detected that the lid 8 was closed, and the valve 18 and the gas transport means 16a were operated.
[0051]
The air in the inner pot 1 is promptly replaced by a nitrogen-enriched gas having a sufficiently low oxygen concentration stored in the nitrogen storage means 17, and the oxygen concentration in the inner pot 1 becomes 2 to 4% in 20 to 60 minutes. Therefore, the supply amount of nitrogen was reduced and kept as it was. After a while, the oxygen concentration in the inner pot 1 increased due to the inflow of the external air, but the oxygen concentration in the inner pot 1 was quickly reduced by increasing the nitrogen supply amount again at a low concentration stage to some extent. Was completed.
[0052]
The sensory evaluation of the cooked rice when the lid 8 was opened and closed also obtained comprehensively good results such as the warm odor, the yellowing of the cooked rice, and the physical properties of the taste.
[0053]
Further, it was found that by changing the supply amount of the nitrogen-enriched gas in accordance with the amount of cooked rice to be kept warm, it is possible to provide delicious cooked rice with less heat retention odor.
[0054]
【The invention's effect】
As described above, according to the cooked rice warmer of the present invention, a nitrogen supply unit that removes oxygen contained in the atmosphere and supplies a nitrogen-enriched gas, and a nitrogen storage unit that stores the nitrogen-enriched gas, Control means for controlling the nitrogen supply amount, wherein the control means controls the supply amount of the nitrogen-enriched gas from the nitrogen storage means to the inner kettle. An unpleasant heat-keeping odor generated in the pot can be scattered to suppress the yellowing of the cooked rice and a decrease in the physical properties at the time of eating, so that the cooked rice can be provided with a delicious cooked rice.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a schematic configuration of a cooked rice warmer in an embodiment of the present invention. FIG. 2 is a sectional view of a nitrogen supply means of the cooked rice warmer. FIG. 3 is a voltage-current characteristic diagram of the nitrogen supply means. FIG. 4 is a characteristic diagram showing a relationship between a heat retention time and an oxygen concentration of the rice cooker;
DESCRIPTION OF SYMBOLS 1 Inner pot 4,11 Temperature detection means 5,7,10 Heating means 6 Control means 8 Cover 15 Nitrogen supply means 16a, 16b Gas transport means 17 Nitrogen storage means 18 Valve 19 Open / close detection means 20 Solid electrolytes 21,22 A pair of electrodes 23 voltage supply device 24 heater 25 heater power supply 26 heat insulating material 27 sealing material 28 current detecting means

Claims (9)

An inner pot for storing the rice, an openable lid provided above the inner pot, heating means for heating the rice in the inner pot, temperature detecting means for detecting the temperature of the inner pot, and A nitrogen supply unit for removing the contained oxygen and supplying a nitrogen-enriched gas to the inner kettle, a nitrogen storage unit for storing the nitrogen-enriched gas from the nitrogen supply unit, and a detection value of the temperature detection unit. And a control means for controlling the heating of the cooked rice to a predetermined temperature using the heating means and controlling a supply amount of the nitrogen-rich gas from the nitrogen storage means to the inner pot. The cooked rice warmer according to claim 1, further comprising a valve between the nitrogen supply means, the inner pot, and the nitrogen storage means, wherein the valve separates the nitrogen supply means from the inner pot during cooking. A valve is provided between the nitrogen supply means, the inner pot, and the nitrogen storage means, and during cooking rice, the nitrogen supply means and the nitrogen storage means are conducted by the valve, and after the rice is cooked, the nitrogen storage means and the inner pot are conducted by the valve. The cooked rice warmer according to claim 1, wherein the cooked rice is kept warm. A nitrogen supply unit, an inner pot, and a valve provided between the nitrogen storage unit, and an opening / closing detection unit for detecting opening / closing of the lid, wherein the opening / closing detection unit detects that the lid has been opened; 2. The cooked rice warmer according to claim 1, wherein the nitrogen supply means and the nitrogen storage means are connected to each other, and when the lid is closed by the open / close detection means, the valve connects the nitrogen storage means to the inner pot. . The nitrogen supply means includes a solid electrolyte having oxygen ion conductivity, a pair of electrodes formed on different surfaces of the solid electrolyte, a voltage supply device connected between the pair of electrodes, and heating the solid electrolyte. A heater, a heater power supply for supplying a voltage to the heater, and a heat insulator provided around the solid electrolyte and the heater. The rice cooker according to claim 1, wherein the nitrogen-rich gas is supplied to an inner pot. The cooked rice warmer according to claim 5, further comprising a seal member for hermetically separating different spaces in which the pair of electrodes are formed. The cooked rice warmer according to claim 5, wherein the heat insulating material is porous and has air permeability. The cooked rice warmer according to claim 5, wherein the heater is embedded in the heat insulating material. 9. The apparatus according to claim 5, further comprising a current detection unit that detects a current flowing through the solid electrolyte, wherein the control unit self-diagnoses a state of the nitrogen supply unit based on a detection value of the current detection unit. 10. Rice cooker.

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