JP2004016623A - Cooked rice heat-retainer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain deliciousness for a long time by restraining an unpleasant smell generated from cooked rice or yellowing of cooked rice at retention of its warmth in a cooked rice heat-retainer. <P>SOLUTION: By providing an oxygen-removing means 19 composed of an oxygen pump element 21 having an oxygen ion conductivity consisting of a metal oxide capable of removing oxygen contained in a heat-retaining space 18, only oxygen molecules can be removed in the heat-retaining space 18, so that an oxygen density in the heat-retaining space 18 can be lowered to several percent, and therefore, generation of an unpleasant smell from the heat-retained rice and yellowing of rice can be greatly restrained. Further, since the oxygen pump element 21 itself can convey self-spreading oxygen molecules as oxygen ions, compactness, light weight and low noise can be realized without equipment such as a compressor. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cooked rice warmer (including a cooker having a warming function) that improves the warming state of cooked rice used for ordinary households or business use.
[0002]
[Prior art]
In the conventional rice cooker, when the rice cooked and kept in a warm state, the power supply to the heating means is stopped and the temperature is lowered to a predetermined warming temperature to keep the temperature.However, if the warming time is long, the rice is included in the cooked rice. There is a problem that fatty acids are oxidized to produce ketones and aldehydes, causing unpleasant odors and yellowing of cooked rice. One method for suppressing the generation of unpleasant odors and yellowing of cooked rice As an example, a cooked rice warmer equipped with a device for reducing the oxygen concentration that causes unpleasant odor and yellowing of cooked rice has been developed.
[0003]
A cooked rice warmer having such a function is disclosed in Japanese Patent Application Laid-Open No. 11-137424. As shown in FIG. 6, this cooked rice warmer has a configuration in which oxygen removing means 3 is arranged between a lid 1 of the cooked rice warmer and an inner lid 2 attached to the lid 1. Means 3 uses a nitrogen-enriched air supply system consisting of a compressor and molecular sieve charcoal. The nitrogen-enriched air supply device, which is the oxygen removing means 3, supplies nitrogen-enriched air from the opening 4 to the heated rice cooked space surrounded by the pot 5 and the inner lid 2, thereby reducing the oxygen concentration. . As shown in FIG. 7, a nitrogen-enriched air supply device as the oxygen removing means 3 includes a compressor 6, a molecular sieve charcoal 7, a nitrogen-enriched air supply port 8, an oxygen exhaust port 9, and a plurality of valves 10 for switching flow paths. It is composed of By adsorbing oxygen molecules when the air compressed by the compressor 6 passes through the molecular sieve 7, nitrogen-enriched air is generated at the nitrogen-enriched air supply port, while the oxygen adsorption capacity of the molecular sieve 7 Is reached, the valve 10 is switched to release oxygen-enriched air to the oxygen outlet 9. The generated nitrogen-enriched air is allowed to flow into the warming space from the opening 4 of the rice warmer in FIG. 6, thereby reducing the oxygen concentration in the warming space, generating unpleasant odors caused by oxygen, and keeping warm rice cooked. Can be suppressed from yellowing.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, the oxygen concentration of the molecular sieve charcoal 7 constituting the nitrogen-enriched supply device used as the oxygen removing means 3 is low in oxygen adsorption efficiency. It takes a long time to perform the reaction, and the reaction between the remaining oxygen and the cooked rice during that time occurs, so that it is difficult to prevent odor and yellowing of the cooked rice.
[0005]
In addition, since a large number of valves 10 for switching between the compressor 6 and the flow path are required in order to obtain nitrogen-enriched air, the apparatus itself becomes large, and the lid 1 needs to be stored in the lid 1 of the rice cooker. Therefore, there was a problem that the rice cooker itself became large.
[0006]
Furthermore, since the compressor 6 is used, noise during operation is high, and there is a concern that operation is particularly difficult at night, such as noisy sounds.
[0007]
The present invention is to solve such a conventional problem, and provides a cooked rice warmer that reduces the oxygen concentration in the warmed space when the cooked rice is kept warm, and suppresses generation of unpleasant odor and yellowing of the cooked rice. It is intended to be.
[0008]
[Means for Solving the Problems]
In order to solve the conventional problem, the cooked rice warmer of the present invention includes an oxygen removing means provided with an oxygen pump element having a metal oxide for removing oxygen contained in a warming space and having oxygen ion conductivity. Configuration. By using an oxygen pump element having oxygen ion conductivity made of a metal oxide as the oxygen removing means, only the oxygen molecules can be removed. Therefore, the oxygen concentration in the heat retaining space can be reduced to several percent in a short time. The generation of unpleasant odor and the yellowing of cooked rice can be remarkably suppressed.
[0009]
In addition, since the oxygen pump element itself can transport oxygen molecules that diffuse naturally as oxygen ions, a device such as a compressor is not required, and a small size, light weight, and low noise can be realized.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention according to claim 1 includes a main body, a pan removably stored in the main body, a lid body having an inner lid for opening and closing an upper opening of the main body, the main body, and the lid. A heating means for heating the pot provided on the body, an oxygen pump element having a metal oxide for removing oxygen contained in a space surrounded by the pot and the lid and having oxygen ion conductivity. With the provided oxygen removing means, by using the oxygen removing means composed of an oxygen pump element having oxygen ion conductivity made of metal oxide, to transport oxygen molecules in the warm air as oxygen ions, Since oxygen molecules can be released from the pump element, it is possible to remove only the oxygen molecules existing in the heat insulation space, and the oxygen concentration in the heat insulation space can be reduced to several percent in a short time. Can significantly suppress the unpleasant yellowing generation and rice odor al, it can be maintained even taste for a long time kept the cooked rice.
[0011]
According to a second aspect of the present invention, in particular, the oxygen removing means according to the first aspect includes a first electrode formed on one surface of a substrate containing a metal oxide and having oxygen ion conductivity and the other surface. An oxygen pump element having a second electrode formed in the oxygen pump element, partitioning means for partitioning a space on the first electrode side and a space on the second electrode side formed in the oxygen pump element, and heating the oxygen pump element A lightweight and small-sized oxygen removing means is realized by comprising at least one heating means and the oxygen pump element, the partitioning means, and a heat insulating material having a ventilation function arranged so as to surround the heating means. In addition, the oxygen pump element used as the oxygen removal means can ionize and transport and remove the oxygen molecules that diffuse naturally, so that the rice warmer can be used without increasing the size of the warm rice cooker body. It can be easily mounted to the body. Further, since no air blowing means such as a compressor and an air pump is required, low noise can be realized.
[0012]
According to a third aspect of the present invention, in particular, the inner lid attached to the lid according to the first aspect is provided with at least one circulation hole through which air in a heat retaining space surrounded by the inner lid and the pan flows. With the configuration in which the oxygen removing means is arranged between the lid and the inner lid, warm air in the heat retaining space can pass through the flow hole provided in the inner lid by the upward flow, so that the air to the oxygen removing means Contact easily occurs, and the removal rate of oxygen can be improved.
[0013]
Further, since the oxygen removing means does not directly touch during operations such as putting in and taking out rice and a pot, damage and contamination can be prevented, and high reliability can be realized.
[0014]
According to a fourth aspect of the present invention, a flow hole is provided between an oxygen removing means disposed inside the lid according to the third aspect and a flow hole provided in an inner lid attached to the lid. By providing a flow passage for introducing the air that has flowed in from the oxygen removing means, the air in the heat retaining space can be efficiently introduced into the oxygen removing means, and the air in contact with the oxygen removing means is shut off from the atmosphere, Since the inflow of air from the atmosphere can be prevented, the removal rate of oxygen in the heat retaining space can be further improved.
[0015]
The invention described in claim 5 is particularly directed to a rice cooker having a heat retaining function by providing an opening / closing means for opening / closing a circulation hole provided in an inner lid attached to the lid according to claim 3 or 4. During cooking, closing the circulation hole with the opening / closing means can prevent the invasion of the ash generated during rice cooking into the inside of the lid, so that the inside of the lid and the oxygen removing means are not contaminated and always keep a clean state. And the performance of the oxygen removing means can be maintained for a long period of time.
[0016]
The invention according to claim 6 is that, when the oxygen concentration in the heat insulating space is lower than the concentration at which the reaction between cooked rice and oxygen does not proceed, the circulation hole is closed, and the reaction between cooked rice and oxygen proceeds. When the concentration is not higher than the concentration, the oxygen removal means can be stopped until the oxygen concentration in the heat retaining space is increased by the inflow of air from the other by operating to open the flow hole, so that power consumption is reduced. Thus, energy saving can be achieved.
[0017]
The invention according to claim 7 is, particularly, by providing a stirring means for stirring air in a heat retaining space surrounded by an inner lid attached to the lid and a pan inside the lid according to claim 1, Diffusion of air in the heat retaining space to the oxygen removing means can be promoted, and the oxygen removing performance of the heat retaining space can be further improved.
[0018]
The invention according to claim 8 is particularly directed to the use of any one of a sirocco fan, a propeller fan, and an air pump as the stirring means according to claim 7, so that the air in the heat retaining space to the oxygen removing means is even higher. Diffusion effect can be obtained.
[0019]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
(Example 1)
FIG. 1 is a sectional view of the overall configuration showing a cooked rice warmer according to a first embodiment of the present invention. In FIG. 1, the cooked rice warmer includes a main body 11, a lid 12 for opening and closing an upper opening of the main body 11, and a detachable pot 13 stored in the main body 11, and a lid on a side facing the pot 13. An inner lid 14 is attached to 12. The bottom and the side of the main body 11 are provided with a bottom heating means 15 comprising an induction heating coil for heating the bottom of the pan 13 and a side heating means 16 comprising an induction heating coil for heating the side of the pan 13. I have. Reference numeral 17 denotes heated rice, and a space surrounded by the pot 13, the inner lid 14, and the cooked rice 17 is a heated space 18. Reference numeral 19 denotes an oxygen removing means which is constituted by an oxygen pump element having oxygen ion conductivity made of a metal oxide for removing oxygen contained in the air in the heat retaining space 18, and 20 denotes an oxygen removing means formed by the air from the heat retaining space 18. A flow hole provided in the inner lid 14 to be flowed into 19.
[0021]
FIG. 2 is a sectional view showing a specific configuration of the oxygen removing means 19 of the present invention. In FIG. 2, reference numeral 21 denotes an oxygen pump element. The oxygen pump element 21 has a first electrode 23 formed on one surface of a substrate 22 made of metal oxide and having oxygen ion conductivity and a second electrode 24 formed on the other surface. It is connected to an oxygen pump drive power supply 25 for applying a DC voltage to the oxygen pump element 21 via lead wires 26 and 27.
[0022]
As the substrate 22 having oxygen ion conductivity, zirconia (YSZ) doped with yttrium or ceria (SDC) doped with samarium is used. In addition, as the first electrode 23 and the second electrode 24, a printed film or a deposited film of platinum (Pt), silver (Ag), a composite metal oxide (SSCO) composed of samarium-strontium-cobalt, or the like is used. When the first electrode 23 acts as a cathode electrode, the second electrode 24 acts as an anode electrode. Reference numeral 28 denotes a partitioning unit for partitioning the space on the first electrode 23 side and the space on the second electrode 24 side, and has an opening facing the first electrode 23, and is bonded to the oxygen pump element 21 with an adhesive material such as glass. Have been.
[0023]
In the present embodiment, the partitioning means 28 is arranged on the first electrode 23 side, but may be arranged on the second electrode 24 side. A material suitable as the partitioning means 28 is a metal plate or a foil of nickel, iron-chromium alloy, titanium, gold, platinum, or the like, or a ceramic plate such as alumina or mullite, but the thermal expansion difference from the oxygen pump element 21 is small, Since small thermal distortion is required, a metal foil of nickel or an iron-chromium alloy is preferable. Reference numeral 29 denotes a heating means provided below the oxygen pump element 21, which is connected via leads 31 and 32 to a heating power supply 30 for applying electric power to the heating means 29, and is connected to the oxygen pump element 21 and the partition means. It is arranged below the oxygen pump element 21 and the partitioning means 28 so as to face at least one surface of the oxygen pump element 28. Reference numerals 33 and 34 denote heat insulating materials having a ventilation function, which are formed of a porous body having a large number of communication holes, and are arranged so as to cover the periphery of the oxygen pump element 21, the partitioning means 28, and the heating means 29. Are housed in a housing 35 provided with an opening so that air from the atmosphere and oxygen can flow out to the atmosphere. As the heat insulating materials 33 and 34 having the ventilation function, an aggregate of silica particles whose main component is an inorganic oxide is used.
[0024]
The operation and action of the cooked rice warmer having the oxygen removing means configured as described above will be described below.
[0025]
When the cooked rice 17 is kept at a temperature of about 70 ° C. by the bottom heating means 15 and the side heating means 16, power is first supplied by the heating power supply 30 of the oxygen removing means 19 according to a command from a control circuit (not shown). The oxygen pump element 21 is supplied to the heating means 29 and is heated.
[0026]
Next, a voltage is applied to the oxygen pump element 21 by the oxygen pump drive power supply 25 using the first electrode 23 as a cathode and the second electrode 24 as an anode. When the oxygen pump element 21 is heated to 500 to 800 ° C. by the heating means 29, oxygen molecules existing in the space on the first electrode 23 side are taken into the substrate 22 having oxygen ion conductivity from the first electrode 23 as oxygen ions. , To the second electrode 24. The oxygen ions that have reached the second electrode 24 become oxygen molecules and are released to the space on the second electrode 24 side. The movement (backflow) of oxygen present on the second electrode 24 side to the first electrode 23 side is suppressed by the partitioning means 28 for partitioning the space on the first electrode 23 side and the space on the second electrode 24 side. Since the oxygen concentration on the one electrode 23 side gradually decreases, as shown by the arrow in FIG. 1, the air containing the oxygen molecules in the heat retaining space 18 that has passed through the flow hole 20 passes through the communication hole of the heat insulating material 33 having a ventilation function. It diffuses and flows into the space on the first electrode 23 side.
[0027]
On the other hand, from the space on the second electrode 24 side, oxygen molecules released from the second electrode 24 diffuse through the heat insulating material 34 having a ventilation function and flow out to the atmosphere. As a result, while the oxygen pump element 21 is operating, oxygen molecules in the air continue to be transported, as indicated by arrows in FIG. 2, and the oxygen concentration in the warming space 18 of the cooked rice warmer is reduced to a level of several percent. be able to.
[0028]
In the present embodiment, the oxygen removing means 19 is constituted by an oxygen pump element 21 made of metal oxide and having oxygen ion conductivity, whereby oxygen molecules in the warm air are transported as oxygen ions, and the oxygen molecules are transferred from the pump element 21 to the oxygen molecules. , It is possible to remove only oxygen molecules present in the heat retaining space, and the oxygen concentration in the heat retaining space can be reduced to several percent in a short time. Thereby, the generation of unpleasant odor and the yellowing of cooked rice caused by long-term exposure to oxygen as in the past can be significantly suppressed, and the deliciousness can be maintained even during the long-term warming. .
[0029]
The oxygen removing unit 19 includes an oxygen pump element 21, a partitioning unit 28 that defines a space on the first electrode 23 side and a space on the second electrode 24 side formed in the oxygen pump element, and a heating unit that heats the oxygen pump element 21. Means 29, the heat insulating materials 33 and 34 having a ventilation function disposed around the oxygen pump element 21 and the heating means 29 and small and small members, so that the lightweight and compact oxygen removing means 19 can be realized. In addition, the oxygen pumping element 21 used as the oxygen removing means 19 can ionize and convey and remove naturally diffused oxygen molecules. Therefore, the oxygen pump element 21 can be easily placed in the main body 11 without increasing the size of the main body 11 of the rice cooker. It can be mounted on. In addition, since no blowing means such as a compressor is required, low noise can be realized.
[0030]
Further, by providing a flow hole 20 in the inner lid 14 attached to the lid 12 and arranging the oxygen removing means 19 between the lid 12 and the inner lid 14, warm air in the heat retaining space 18 is generated by the upward flow. Since the air can pass through the flow hole 20 provided in the inner lid 14, air can easily come into contact with the oxygen removing means 19, and the oxygen removing speed can be improved. Further, since the oxygen removing means 19 does not directly touch during operations such as putting in and taking out rice and a pot, damage and contamination can be prevented, and high reliability can be realized.
[0031]
Although the embodiment has been described with a configuration in which one circulation hole 20 is provided, the number of the circulation holes 20 is not limited to the current one, and a plurality of circulation holes 20 may be provided.
[0032]
(Example 2)
FIG. 3 is a sectional view of a waist portion of a cooked rice warmer according to a second embodiment of the present invention. 3, the same components as those in FIGS. 1 and 2 of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. 3, the oxygen pump driving power supply 25, the lead wires 26 and 27, the heating power supply 30, and the lead wires 31 and 32 described in FIG. 2 are omitted.
[0033]
As shown in FIG. 3, the difference from the first embodiment lies in that a portion between an oxygen removing means 19 disposed inside the lid 12 and a flow hole 20 provided in the inner lid 14 attached to the lid 12. Is provided with a flow passage 36 for introducing the air flowing from the flow hole 20 into the oxygen removing means 19. The flow passage 36 is formed by a partition 37 provided so as to connect the lid 12 and the inner lid 12.
[0034]
With this configuration, since the air in the heat retaining space 18 can be efficiently introduced into the oxygen removing means 19, the rate of removing oxygen from the heat retaining space 18 can be improved. Further, the air that comes into contact with the oxygen removing means 19 is cut off from the atmosphere by the flow passage 35, and the inflow of air from the atmosphere can be prevented, so that the oxygen removing speed of the heat retaining space 18 can be further improved.
[0035]
(Example 3)
FIG. 4 is a sectional view of a waist portion of a cooked rice warmer according to a third embodiment of the present invention. 4, the same components as those in FIGS. 1 and 2 of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. 4, the oxygen pump driving power supply 25, the lead wires 26 and 27, the heating power supply 30, and the lead wires 31 and 32 described in FIG. 2 are omitted.
[0036]
As shown in FIG. 4, a difference from the configuration of the first embodiment is that an opening / closing unit 38 that opens and closes a circulation hole 20 through which air in the heat retaining space 18 provided in the inner lid 14 passes is provided. The opening / closing hand 38 has an opening / closing valve 39 connected to a support means 40. The support means 40 extends to the outside of the flow passage 36 and the oxygen removing means 19, and is fixed to the lid 12 together with the spring 41.
[0037]
FIG. 4 shows a state in which the oxygen removing means 19 is operating at the time of keeping the cooked rice, and the opening / closing means 38 has a state in which the circulation hole 20 is opened. The opening / closing means 38 operates a driving mechanism (not shown) such as a cam, so that the spring 41 is returned, and the supporting means 40 and the opening / closing valve 39 attached to the tip of the supporting means 40 are moved upward. Hole 20 is opened. When the oxygen removing means 19 is operated in this state, the air in the heat retaining space 18 is guided to the oxygen removing means 19 through the circulation holes 20 as indicated by arrows in the figure, and the oxygen in the heat retaining space 18 is removed.
[0038]
On the other hand, when the rice is not kept warm or when cooking with a rice cooker having a heat retaining function, the opening / closing means 38 is operated by a driving mechanism such as a cam, and the spring 41 is pushed to move the supporting means 40 and the opening / closing valve 39 downward. Then, the communication hole 20 is closed.
[0039]
In the present embodiment, in the rice cooker having a heat retaining function, since the circulation hole 20 is closed by the opening / closing means 38 during the cooking of rice, it is possible to prevent invading the inside of the lid generated during the cooking of rice. The inside of the lid 12 and the oxygen removing means 19 are not contaminated and can be kept clean at all times, and the performance of the oxygen removing means 19 can be prevented from deteriorating due to the attachment of foreign matter, and the initial performance can be maintained for a long time. can do.
[0040]
Further, when the oxygen concentration in the heat retaining space 18 reaches a concentration at which the reaction between cooked rice and oxygen does not proceed by the oxygen removing means 19 in the state of keeping the cooked rice, the oxygen removing means 19 does not need to be operated any more. Is stopped, and at the same time, the opening / closing means 38 is operated to close the circulation hole 20.
[0041]
Thereafter, when the oxygen concentration in the heat retaining space 18 increases to a concentration at which the reaction proceeds due to the inflow of air from the other, the oxygen removing means 19 is operated again, and the opening / closing means 38 opens the flow hole 20 to remove oxygen from the heat retaining space 18. . When the oxygen removing means 19 is stopped, the opening / closing means 38 is operated to close the circulation hole 20 because the oxygen concentration in the heat retaining space 18 is reduced by the oxygen removing means 19 or the air gap between the lid 12 and the inner lid 14. This is to suppress the inflow of air inside and to reduce the rate of increase in the oxygen concentration in the heat retaining space 18. By closing the flow hole 20 by the on-off valve 38 while the oxygen removing means 19 is stopped, the stopping time of the oxygen removing means 19 can be extended, so that power consumption is reduced and energy saving can be achieved. .
[0042]
The control of the oxygen removing means 19 and the opening / closing means 38 can be performed by a method of detecting the oxygen concentration in the heat retaining space 18 by an oxygen sensor or by obtaining an increasing rate of the oxygen concentration in advance by time.
[0043]
(Example 4)
FIG. 5 is a sectional view of a waist portion of a cooked rice warmer according to a fourth embodiment of the present invention. 5, the same components as those in FIGS. 1 and 2 of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. 5, the oxygen pump drive power supply 25, the lead wires 26 and 27, the heating power supply 30, and the lead wires 31 and 32 described in FIG. 2 are omitted.
[0044]
As shown in FIG. 5, the difference from the configuration of the first embodiment is that a heat insulation space 18 surrounded by an inner lid 15 attached to a lid 14 and a pan is provided inside a lid 12 constituting a rice cooker. The stirring means 42 for stirring the air and the air flowing from the heat retaining space 18 is provided.
[0045]
The stirring means 42 comprises a small sirocco fan 43 and a shaft 44 of the sirocco fan 43. The shaft 44 extends to the outside of the flow passage 36 and the oxygen removing means 19, is fixed to the lid 12, and the shaft 44 is a motor. Drive source (not shown).
[0046]
The stirrer 42 is operated when the oxygen removing stage 19 is operating, and can promote the diffusion of the air in the heat retaining space 18 to the oxygen removing means 19, thereby further improving the oxygen removing performance of the heat retaining space 18. Can be done. As the agitating means 42, in addition to the sirocco fan 43, any one of a propeller fan and an air pump is used, whereby a higher effect of diffusing the air in the heat retaining space 18 to the oxygen removing means 19 can be obtained. As a result, the rate of removing oxygen from the heat retaining space 18 can be improved.
[0047]
The stirring means 42 does not need to be operated continuously while the oxygen removing means 19 is operating, and may be operated intermittently.
[0048]
【The invention's effect】
As described above, according to the first to eighth aspects of the present invention, only the oxygen molecules of the air in the heat retaining space can be removed, so that the oxygen concentration in the heat retaining space can be reduced to several percent in a short time. The generation of unpleasant odor and the yellowing of cooked rice can be remarkably suppressed. In addition, since the oxygen pump element itself can transport oxygen molecules that diffuse naturally as oxygen ions, a device such as a compressor is not required, and a small size, light weight, and low noise can be realized.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing the overall configuration of a cooked rice warmer according to a first embodiment of the present invention; FIG. 2 is a cross-sectional view showing a specific structure of oxygen removing means of the cooked rice warmer; FIG. FIG. 4 is a sectional view of a waist of a cooked rice warmer according to a second embodiment. FIG. 4 is a sectional view of a waist of a cooked rice warmer according to a third embodiment of the present invention. FIG. 5 is a cooked rice warmer of a fourth embodiment of the present invention. FIG. 6 is a cross-sectional view showing the overall configuration of a conventional rice cooker. FIG. 7 is a configuration diagram showing a nitrogen-enriched air supply device of the rice cooker.
DESCRIPTION OF SYMBOLS 11 Main body 12 Lid 13 Pot 14 Inner lid 18 Heat insulating space 19 Oxygen removing means 20 Flow hole 21 Oxygen pump element 22 Substrate having oxygen ion conductivity 23 First electrode 24 Second electrode 28 Partitioning means 29 Heating means 33, 34 Ventilation Insulating material 36 having function Flow passage 38 Opening / closing means 42 Stirring means

Claims (8)

A main body, a pan removably stored in the main body, a lid body having an inner lid for opening and closing an upper opening of the main body, and heating the pan provided on the main body and the lid body. A heating means for removing oxygen contained in a space surrounded by the pot and the lid, and an oxygen pumping element having an oxygen pump element having oxygen ion conductivity. Rice cooker. An oxygen pump element having a first electrode formed on one surface of a substrate containing a metal oxide and having oxygen ion conductivity and a second electrode formed on the other surface; Partitioning means for partitioning a space on the first electrode side and a space on the second electrode side formed in the pump element, at least one heating means for heating the oxygen pump element, the oxygen pump element, the partitioning means, The cooked rice warmer according to claim 1, further comprising a heat insulating material having a ventilation function disposed so as to surround the heating means. At least one circulation hole through which air in a heat retaining space surrounded by the inner lid and the pan flows in the inner lid attached to the lid, and oxygen removing means is disposed between the lid and the front inner lid. Item 7. The cooked rice warmer according to Item 1. A flow passage is provided between the oxygen removing means disposed inside the lid and a flow hole provided in the inner lid attached to the lid, for introducing air flowing from the flow hole into the oxygen removing means. The rice cooker according to claim 3. The cooked rice warmer according to claim 3 or 4, further comprising an opening / closing means for opening / closing a flow hole provided in the inner lid attached to the lid. When the oxygen concentration in the heat insulating space is lower than the concentration at which the reaction between cooked rice and oxygen does not proceed by the opening and closing means, the circulation hole is closed, and when the concentration is higher than the concentration at which the reaction between cooked rice and oxygen does not proceed, the circulation hole is opened. Item 5. The cooked rice warmer according to Item 5. The cooked rice warmer according to claim 1, wherein a stirring means for stirring air in a space surrounded by the inner lid and the pan attached to the lid is provided inside the lid. The rice cooker according to claim 7, wherein the stirring means is any one of a sirocco fan, a propeller fan, and an air pump.

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