JP3287735B2 - Electrochemical gas pump for rice cooker and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrochemical gas pump for a rice cooker used in a rice cooker such as a jar cooker.

[0002]

2. Description of the Related Art In general, rice cookers for cooking and keeping warm have been technologically improved so that rice can be cooked as delicious as possible and then stored in a delicious state. in recent years,
A rice cooker / insulation mechanism based on the neuro-fuzzy theory was developed.
With the application of H), rice has been cooked and stored deliciously. Although the technology of rice cooking has become quite mature, there is still room for development as to how to store rice after it has been cooked. In other words, the cooked rice once enters a warm state. After that, the lid is opened and the rice is taken out, and the remaining rice is stored again in a warm state. The next time the rice is taken out a few hours later, the rice will often turn yellow and give off unpleasant odors. This is mainly due to the oxidation of the rice, which causes the rice to become unsavory depending on the storage condition.

[0003] Although a method of keeping the storage state as good as possible by adjusting the heat retaining temperature has been considered, direct oxidation of cooked rice has not been realized. Japanese Patent Application Laid-Open No. HEI 5-154 discloses a means for removing oxygen from an insulated kettle.
039 has been proposed. This method comprises a gas separation membrane that allows only oxygen to permeate and a decompression device (mechanical pump), and a method has been proposed in which oxygen in the incubator is discharged outside the incubator.

[0004]

However, the rice cooker proposed above has the following problems. In other words, a valve device, a gas separation membrane, and a decompression device are provided in the lid,
The lid itself becomes larger and heavier, which hinders opening and closing of the lid. In addition, problems such as performance degradation due to dew condensation of the gas separation membrane, operation noise of the decompression device, and a means for reducing the pressure in the case of oxygen discharge have been difficult to put to practical use unless devised.

The present invention has been made in view of the above-mentioned problems of the conventional rice cooker, and has as its object to provide an electrochemical gas pump or the like for a rice cooker for discharging and removing oxygen or reducing the concentration in the warmer. It is the purpose.

[0006]

SUMMARY OF THE INVENTION The present invention proposes an electrochemical gas pump for a rice cooker and warmer, wherein the gas pump comprises a plurality of single electrolytic cells. And each of the gas pumps is arranged in parallel. Further, it has a confidential base and a separator, and has a coefficient of thermal expansion of 1 × 10 ⁻⁶ / K to 1 × 1 for bonding these parts.
It is characterized by using a paste of ^0-4 / K glass material or ceramic material.

[0007]

By providing the above structure, the present invention can manufacture a gas pump with a simple and compact structure with a high yield. By using this pump, it is possible to instantly remove or reduce the concentration of oxygen in a warmer with a large capacity, high efficiency, and instantaneously, thereby preventing yellowing and unpleasant odor of rice during warming.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) This embodiment is an example of a parallel circuit composed of a plurality of single electrolyzers, in which the single electrolyzers are arranged in parallel with each other. A glass material that is softened and does not melt is used for bonding a single electrolytic cell to a substrate and a separator with a coefficient of thermal expansion of 1 × 10 ⁻⁶ / K to 1
An example in which a paste of a glass material of x10 ^-4 / K and a ceramic material is used will be described.

FIG. 1 is an external view of a substrate pump assembled in this embodiment, and FIG. 2 is a sectional view thereof. 1A is an overall perspective view, FIG. 1B is a side view of one solid electrolyte 1,
(C) is a front view of one solid electrolyte 1. A flat portion exists at the top of the cylindrical base tube 5, and a part of the flat portion is cut out in a rectangular shape to form an opening.
In the opening, a plurality of disk-shaped solid electrolytes 1 are arranged in parallel in a state of being exposed to the outside about half of them. This solid electrolyte 1 corresponds to a single electrolytic cell. further,
Of the gaps formed between the solid electrolytes 1, every other gap that is exposed to the outside is covered with a curved ribbon-shaped separator 4. Further, among the gaps formed between the solid electrolytes 1, every other gap present inside the base tube 5 is covered with a curved ribbon-shaped separator 4. However, the separator 4 outside the base tube 5 and the separator 4 inside the base tube 5 cover alternate gaps. Therefore, the gas that has entered the gap from the inside of the base tube 5 passes through the solid electrolyte 1 and is discharged to an adjacent gap, and further discharged to the outside.

The solid electrolyte 1 has a diameter of 18 mm and a thickness of 0.5 mm.
BaCe _0.8 Gd _0.2 O _3- α (BCG) sintered body was used, and a platinum electrode (paste baking) having an electrode area of 2 cm ² was used as an anode 2 and a cathode 3 of the solid electrolyte 1.
The separator 4 and the base tube 5 were produced by cutting an alumina tube.

Further, between the solid electrolyte 1 and the base tube 5 or between the solid electrolyte 1 and the separator 4, a borosilicate glass sealing material 6 containing 80% or more of SiO ₂ conforming to each shape is interposed. Further, the adhesive of those members has a coefficient of thermal expansion of 1 × 10 ⁻⁶ / K to 1 × 10 ⁻⁴ / K.
A paste of K glass material 7 or ceramic material 8 was used.

In the present embodiment, eleven solid electrolytes 1 were arranged and connected to a simulated incubator via a connecting pipe 9 for evaluation of oxygen removal. The circuit of the solid electrolyte 1 was configured to be a parallel circuit, and electricity was supplied using the inside of the base tube 1 as a cathode.

The simulated incubator bottle before energization was in the atmosphere and had an oxygen concentration of 20.8%. This gas pump was kept at 500 ° C. in an electric furnace, and electricity was supplied at 1 A to pump out oxygen.
FIG. 3 shows the oxygen concentration with respect to the time when the gas pump was operated. It was confirmed that the oxygen concentration reached 1-2% in about one hour. Thus, it can be seen that the gas pump of this embodiment has a simple structure, is easy to manufacture, can pump oxygen efficiently, and is a practical gas pump.

In this embodiment, the size and shape of the single electrolytic cell
The shape and manufacturing method are not regulated, and what size,
It can be rectangular, polygonal, or disk-shaped.
May be used. In this embodiment, the solid electrolyte
BaCe_0.8Gd_0.2O_3-α (BCG) sintered body, platinum for electrode
The example used was shown, but the electrolyte was ZrO_TwoSystem, CeO_TwoSystem, Bi _TwoO
_ThreeSystem or any electrolyte, electrodes such as silver
May be used. Also, the material of the base tube,
If it is confidential, use metal or ceramic.
However, neither the alloy nor the shape is specified. single
The number of electrolytic cells may be 20, 30, or any number.

(Example 2) This example relates to the production of an electrochemical gas pump for a rice cooker comprising a single electrolyzer, a base and a separator, between the single electrolyzer and the base or between the single electrolyzer and the separator. An example of a method for manufacturing an electrochemical gas pump for a rice cooker and an insulated rice cooker characterized by inserting a glass sealing material will be described.

[0017] As the solid electrolyte is a single electrolyzer, thickness 0.35 mm, using a BaCe _{0. 85} Gd _0.15 O _3- α diameter 20 mm, outer diameter 21 mm, an alumina tube having an inner diameter of 18mm using a substrate tube, joining An experiment was performed. First, a glass paste having the same coefficient of thermal expansion as the solid electrolyte was directly inserted between the solid electrolyte and the base tube, and a load was applied at 900 ° C. to perform bonding. When the adhesion was observed after the temperature was lowered, cracks were observed in the electrolyte, and it was considered that stress was exerted at the time of the temperature drop due to the difference in coefficient of thermal expansion, and cracks occurred. Next, a glass material ring (thickness 0.3 mm, outer diameter 21 mm, inner diameter 18 m) softened at 600 ° C. or higher and melted between the solid electrolyte and the base tube.
m) was inserted and bonding was performed in the same manner as described above.
There were no cracks in the electrolyte and the base tube, and the stress was sufficiently relaxed. Similarly, when a glass ring of 0.05 to 0.1 mm was prepared and subjected to a bonding test,
If it was less than 0.1 mm, cracking occurred, but if it was 0.1 mm or more, no cracking occurred.

As is apparent from this embodiment, by inserting a buffer material such as a glass ring into the sealing material,
It can be seen that the gas pump can be manufactured more reliably and with good yield by preventing cracking of the electrolyte and the like.

In this experiment, the actual operating temperature of the gas pump is assumed to be 500 ° C., and the temperature at which the sealing material softens and the temperature at which it does not melt is determined to be 600 ° C. In addition, the softening temperature and melting temperature of the glass
The amount of SiO ₂ is closely related to the amount of SiO _2,
A seal material suitable for this pump is obtained from borosilicate glass containing. Glasses having a SiO ₂ content of 79% or less have low softening points and melting points and low buffering properties. Conversely, those containing 98% or more of SiO ₂ did not soften even at 1000 ° C. and were not sealable. .

(Embodiment 3) In this embodiment, in the manufacture of an electrochemical gas pump for a rice cooker comprising a single electrolytic cell, a base, and a separator, the bonding between the single electrolytic tank and the base, or the bonding of the single electrolytic tank and the separator, is performed. This is an example of a method for manufacturing an electrochemical gas pump for a rice cooker / insulator, wherein a paste of a glass material or a ceramic material is used for bonding.

As shown in the first embodiment, a single electrolytic cell
Good airtightness for adhesion to substrate or separator
In addition, adhesives that are strong in heat cycles are required. In FIG.
Single electrolytic cell (solid electrolyte: BaCe_0.8Gd_0.2O_3-α) Thermal expansion
The rate change is shown. Average thermal expansion coefficient from room temperature to 600 ° C
Is 1.4 × 10^-Five/ K, differentially 1 × 10 ^-6
/ K ~ 1 × 10^-Four/ K. Bonding
Preparation of glass and ceramic pastes
Then, when the adhesion was tested, 1 × 10^-6/ K ~ 1 × 10^-Four
5 times for glass and ceramic materials in the range of / K
Adhesive strength and after the heat cycle of room temperature -500 ℃
Excellent confidentiality. On the other hand,
For those with a coefficient of thermal expansion, the adhesive strength is weak and heat cycle
Cracks occurred during the test.

Other solid electrolytes such as ZrO ₂ type, CeO ₂ type,
Similar results were obtained using a Bi ₂ O ₃ system or the like. The main components of the glass material and the ceramic material used in this example are
SiO2 (80% or more), Ai ₂ O ₃ or ZrO ₂ (90% or more), respectively, and it is considered that these main components produce good adhesion. In this example, the paste was prepared using a solvent such as terpineol and a binder, but the viscosity of the paste may be any. The powder may have any particle size.

It is not always necessary that the plurality of single electrolyzers be arranged in parallel, and it is not necessary that the plurality of single electrolyzers be electrically connected in parallel. A series connection is also possible.

[0024]

As is apparent from the above description,
The gas pump using a plurality of single electrolyzers of the present invention has a compact structure and can be easily manufactured.

In the manufacturing method, a glass material serving as a buffer is inserted between components such as a single electrolytic cell, a base and a separator, and the adhesive has a thermal expansion coefficient of 1 × 10 ⁻⁶ / K or less.
By using a paste of a glass material or a ceramic material of 1 × 10 ⁻⁴ / K, a gas pump can be manufactured simply, reliably, and with good yield.

The use of this pump makes it possible to instantaneously remove or reduce the concentration of oxygen in a warmer with a large capacity and high efficiency, and to prevent yellowing and unpleasant smell of rice during warming.

[Brief description of the drawings]

FIG. 1 is a perspective view of a gas pump manufactured in one embodiment of the present invention.

FIG. 2 is a sectional view of the gas pump of the embodiment.

FIG. 3 is a graph showing a relationship between an operation time of a gas pump and an oxygen concentration of a simulated incubator bottle in the embodiment.

[Figure 4] Single electrolytic cell (solid electrolyte: BaCe _0.8 Gd _0.2 O _3- α)
5 is a graph showing a change in the coefficient of thermal expansion of the sample.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solid electrolyte 2 Anode 3 Cathode 4 Separator 5 Base tube 6 Sealing material 7 Glass material 8 Ceramic material 9 Connection tube

──────────────────────────────────────────────────の Continuing on the front page (72) Koji Gamo, Inventor 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Kunito Mori 1006 Kadoma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Yuji Mukai 1006 Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-5-154039 (JP, A) JP-A-5-192244 (JP, A) JP-A-57-188218 (JP, A) JP-A-7-127860 (JP, A) JP-A-5-192259 (JP, A) JP-A-3-53872 (JP, A) JP-A-55-84117 (JP, A) JP-A-5-254803 (JP, A) JP-A-55-136101 (JP, A) JP-A-63-207973 (JP, A) JP-A-2-135115 (JP, A) Kaihei 2-99966 (JP, U) JP-63-56162 JP, B2) PCT National flat 8-500692 (JP, A) WO 96/28589 (WO, A1) (58 ) investigated the field (Int.Cl. ^7, DB name) A47J 27/00 B01D 53/00 - 53/96 C25B 1/00-15/08

Claims (13)

(57) [Claims] 1. An electrochemical gas pump for a rice cooker, wherein a plurality of single electrolytic cells having electrodes formed thereon are used. 2. The single electrolytic cell is a plate-like solid electrolyte,
2. The method according to claim 1, wherein the elements are arranged substantially in parallel.
An electrochemical gas pump for a rice cooker as described. 3. The electrochemical gas pump according to claim 1, wherein the plurality of single electrolyzers are electrically connected in parallel. 4. A plurality of single electrolyzers are partially accommodated in a base, and a gap between the plurality of single electrolyzers is partially covered by a separator. An electrochemical gas pump for a rice cooker and warmer, characterized in that the inside is airtight. 5. The electrochemical gas pump according to claim 4, wherein the substrate is made of ceramics, metal or alloy. 6. An electrochemical gas pump for a rice cooker / warmer according to claim 1, wherein a glass sealing material is inserted between the single electrolytic cell and the base or between the single electrolytic cell and the separator. Manufacturing method of electrochemical gas pump for rice cooker warmer. 7. The method according to claim 6, wherein the glass seal material has a thickness of 0.1 mm or more. 8. The glass sealing material is at least 600 ° C. and 100
7. The method for producing an electrochemical gas pump for a rice cooker according to claim 6, wherein the material is a material that softens and does not melt at 0 ° C. or lower. 9. The glass sealing material contains at least 80% of SiO _2.
The method for producing an electrochemical gas pump for a rice cooker and incubator according to claim 6, wherein the material is a material mainly containing borosilicate glass containing 8% or less. 10. The electrochemical gas for a rice cooker according to claim 6, wherein a paste of a glass material or a ceramic material is used for adhesion between the single electrolytic cell and the substrate or between the single electrolytic cell and the separator. Pump manufacturing method. 11. The method according to claim 10, wherein the glass or ceramic material has a coefficient of thermal expansion of 1 × 10 ⁻⁶ / K to 1 × 10 ⁻⁴ / K. . 12. The method for producing an electrochemical gas pump for a rice cooker and incubator according to claim 10, wherein the glass material is a material mainly composed of borosilicate glass containing 80% or more of SiO ₂ . 13. The method according to claim 10, wherein the ceramic material is a material mainly containing Al ₂ O ₃ or ZrO ₂ .