JP2007126327A - Oxygen pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oxygen pump device using an oxygen ion conductive solid electrolyte which is reduced in energy consumption and improved in endurance reliability. <P>SOLUTION: The oxygen pump device comprises: a cathode electrode 2 and an anode electrode 3 on both the sides of an oxygen ion conductive solid electrolyte 1; an oxygen pump element 4 heated with a heating element 5; a partition means 6 of partitioning both spaces; and a heat insulating material 9 arranged so as to extermally cover the circumference of the space on the cathode side and the space on the anode side. A holding plate 10 of holding the oxygen ion conductive solid electrolyte 1 via an electric insulating joining material 11 is made of a metal having almost the same thermal expansion coefficient as that of the oxygen ion conductive solid electrolyte 1, and a metal oxide based fine thin film 12 is formed at least on the surface at the side confronted with the heating element 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an oxygen pump device using an oxygen ion conductive solid electrolyte that has reduced energy such as power consumption necessary for heating and improved durability reliability.

  Conventional oxygen pump devices include oxygen enriched devices that use high molecular weight membranes such as organosilicones and zeolites to increase the oxygen concentration. Recently, there have been proposals for devices using oxygen ion conductive solid electrolytes. (See, for example, Patent Document 1).

  FIG. 3 shows the configuration, and a voltage of several volts is applied to the first electrode 52 and the second electrode 53 formed on both surfaces of the oxygen ion conductive solid electrolyte 51 by a direct current power source 54 so as to convert oxygen molecules into the first electrode. The oxygen pump element 55 is configured to move to the second electrode 53 via the oxygen ion conductive solid electrolyte 51 from 52 and generate 100% oxygen gas on the second electrode 3 side.

  The oxygen pump element 55 is partitioned into a space 58 on the first electrode 52 side and a space 59 on the second electrode 53 side by partition means 57 attached via an adhesive material 56.

  Further, in order to effectively perform this electrochemical reaction for oxygen generation, a heater 60 for heating the oxygen pump element 55 is disposed near the oxygen pump element 55. Has been.

  The oxygen pump element 55, the partition means 57, and the heater 60 are surrounded by a breathable heat insulating material 61 and further surrounded by a casing 62 having an opening to reduce heat dissipation. Electric power is reduced.

  Since the oxygen pump element 55 and the heater 60 are not directly in contact with the atmosphere by the breathable heat insulating material 61, the thermal efficiency of the heater 60 to the oxygen pump element 55 is improved, and the power consumption can be reduced.

Further, since the partition means 57 that simultaneously holds the oxygen pump element 55 is composed of a metal foil of an iron-chromium alloy having substantially the same thermal expansion coefficient, the oxygen pump element 55 is held elastically. Therefore, a uniform temperature distribution can be obtained in combination with the synergistic effect with the heat insulating material 62, and crack breakage caused by the temperature difference is prevented.
JP 2003-215094 A

  However, in a conventional oxygen pump device using an oxygen ion conductive solid electrolyte, in order to reduce the power required for heating, the oxygen pump element 55, the partition means 57, and the heater 60 are surrounded by a breathable heat insulating material 61. Since the structure is designed to reduce heat dissipation by enclosing it, there is a problem that when the oxygen generation and concentration capacity is increased, the power consumption of the heater 60 is not reduced as expected.

  This is because when the oxygen generation / concentration capacity is increased, it is necessary to supply and replenish a large amount of air. In order to smoothly replenish this large amount of air, it is necessary to positively increase the air permeability of the heat insulating material 61. The thickness of the insulation must be reduced. As a result, the heat insulation performance is lowered and the temperature of the oxygen pump element 55 is lowered. For the purpose of preventing this, the amount of electric power of the heater 60 is increased to maintain the oxygen pump element 55 at a predetermined temperature. To deal with it.

As described above, since the oxygen pump element 55 and the heater 60 are configured not to come into direct contact with the atmosphere by the breathable heat insulating material 61, a small amount of air supply can be replenished when the oxygen generation and concentration capacity is small. Therefore, this configuration can cope with this. However, if the oxygen generation and concentration capacity is increased, a large amount of air supply replenishment is required, so that the heat insulating material 61 prevents air supply replenishment. For this reason, if the conventional heat insulation structure is used as it is and the oxygen generation and concentration capacity is improved, it is necessary to positively increase the air permeability by reducing the thickness of the heat insulating material 61 or the like. Invited to increase.
This invention solves the said subject and aims at the further reduction of the power consumption of heating bodies, such as a heater which heats an oxygen ion conductive solid electrolyte.

  In order to achieve the above object, an oxygen pump device of the present invention includes an oxygen pump element having a cathode electrode and an anode electrode formed on both surfaces of an oxygen ion conductive solid electrolyte, a cathode side space and an anode side space of the oxygen pump element. Partitioning means for partitioning, a heating body for heating the oxygen pump element disposed in at least one internal space of the cathode side space or the anode side space, and a space surrounding the cathode side space and the anode side space The holding plate that has a heat insulating material and constitutes the partition means and holds the oxygen ion conductive solid electrolyte via the inorganic electrically insulating bonding material has substantially the same thermal expansion coefficient as the oxygen ion conductive solid electrolyte. It is assumed that a metal oxide fine thin film is formed at least on the surface of the heating body.

  The holding plate for holding the oxygen ion conductive solid electrolyte is made of metal, and has a structure in which a metal oxide-based fine thin film is formed on the surface on the heating body side. On the other hand, since an electrically insulating bonding material generally uses glass or ceramic, it is necessary to fire at a high temperature in order to ensure electrical insulation and bonding properties. The metal oxide thin film is heat treated. Due to this heat receiving structure and high-temperature heat treatment, the metal oxide fine thin film absorbs infrared rays emitted from the heating body and rises in temperature, and transmits the rising heat to the oxygen ion conductive solid electrolyte through the metal. For this reason, the oxygen ion conductive solid electrolyte effectively receives the radiant heat generated from the heating body and is held at a high temperature, and the influence of the temperature drop due to the reduction in the thickness of the heat insulating material caused by the necessity of supplying a large amount of air As a result, there is an effect that it is difficult to increase the power of the heating element provided.

  In addition, the metal oxide fine thin film has a protective action such as prevention of oxidation of the metal foil, and has an effect of further improving the durability reliability. Furthermore, since the holding plate that holds the oxygen pump element at the same time is made of a metal having substantially the same thermal expansion coefficient, the oxygen pump element is held elastically, and the radiant heat of the metal oxide fine thin film In combination with the synergistic effect with the heat receiving effect, a uniform temperature distribution can be obtained, and crack breakage due to the temperature difference is prevented.

  The oxygen pump device of the present invention can reduce the energy required for heating the oxygen pump element and improve its durability reliability.

An oxygen pump device according to a first aspect of the present invention is an oxygen pump element having a cathode electrode and an anode electrode formed on both surfaces of an oxygen ion conductive solid electrolyte, and a partition means for partitioning a cathode side space and an anode side space of the oxygen pump element. A heating element that is disposed in at least one internal space of the cathode side space or the anode side space and that heats the oxygen pump element; and a heat insulating material that is disposed so as to surround the cathode side space and the anode side space And a holding plate that holds the oxygen ion conductive solid electrolyte via an electrically insulating bonding material and has a thermal expansion coefficient substantially the same as that of the oxygen ion conductive solid electrolyte. It is a metal, and a metal oxide fine thin film is formed at least on the surface facing the heating element.

  The holding plate for holding the oxygen ion conductive solid electrolyte is made of metal, and has a structure in which a metal oxide-based fine thin film is formed on the surface on the heating body side. On the other hand, the electrical insulating bonding material needs to be fired at a high temperature in order to ensure electrical insulation and bondability. By this high-temperature firing, the metal of the holding plate and the metal oxide fine thin film on the surface are heat-treated. The

  Due to this configuration and high-temperature heat treatment, the metal oxide fine thin film absorbs infrared rays emitted from the heating body and rises in temperature, and transmits the rising heat to the oxygen ion conductive solid electrolyte through the metal. For this reason, the oxygen ion conductive solid electrolyte effectively receives the radiant heat generated from the heating body and is held at a high temperature, and the influence of the temperature drop due to the reduction in the thickness of the heat insulating material caused by the necessity of supplying a large amount of air As a result, there is an effect that it is difficult to increase the power of the heating element provided.

  In addition, the metal oxide fine thin film has a protective action such as prevention of oxidation of the metal foil, and has an effect of further improving the durability reliability. Furthermore, since the holding plate that holds the oxygen pump element at the same time is made of a metal having substantially the same thermal expansion coefficient, the oxygen pump element is held elastically, and the radiant heat of the metal oxide fine thin film In combination with the synergistic effect with the heat receiving effect, a more uniform temperature distribution can be obtained, and crack breakage due to the temperature difference is further prevented.

  In the oxygen pump device of the second invention, the holding plate in the oxygen pump device of the first invention is ferritic stainless steel, and the metal oxide fine thin film is mainly composed of zirconium oxide or titanium oxide excellent in vitrification and crystallization. Ingredients.

  With this material composition, the metal oxide fine thin film can effectively receive the radiant heat generated from the heating body and can effectively hold the oxygen pump element at a high temperature due to a synergistic effect.

  In the oxygen pump device of the third invention, the casing constituting the cathode side space in the oxygen pump device of the first invention is a metal having two air pipes through which air flows in and flows, and a heating body is provided in the internal space. It was set as the structure which arranged.

  With this configuration, the metal of the housing reflects the radiant heat generated from the heating body, and the reflected heat is effectively received by the metal oxide thin film, so that the oxygen pump element can be effectively held at a high temperature. . Further, the convection heat generated from the heating body is also reversed by the metal of the housing and is confined, so that the oxygen pump element can be held more effectively at a high temperature.

  The oxygen pump device of the fourth invention is a metal having a gas discharge pipe through which at least the oxygen-related product gas passes through the casing constituting the anode side space in the oxygen pump device of the first invention.

  With this configuration, the housing metal reflects the radiant heat emitted from the oxygen pump element held at a high temperature, and the reflected heat is effectively received by the oxygen pump element, so that the temperature can be increased more effectively. I was able to hold it. In addition, the convection heat is reversed by the metal of the casing and the heat is confined, so that the oxygen pump element can be held at a high temperature more effectively.

  In the oxygen pump device of the fifth invention, the metal oxide fine thin film in the oxygen pump device of the first invention is formed on the holding plate on the side holding the oxygen ion conductive solid electrolyte.

When the metal oxide fine thin film is formed on the holding plate on the side holding the oxygen ion conductive solid electrolyte, the adhesion and the electric insulation between the electric insulating bonding material made of glass or ceramic and the holding plate are improved.

  In the oxygen pump device of the sixth invention, the metal oxide fine thin film in the oxygen pump device of the first invention is formed on both surfaces of the holding plate.

  When the metal oxide thin film is formed on both sides of the holding plate, the two problems of receiving heat of the radiant heat generated from the heating body, and improving the adhesion between the electrically insulating bonding material and the holding plate and improving the electrical insulation are simple. Can be solved easily by design.

  In the oxygen pump device of the seventh invention, the electrically insulating bonding material in the oxygen pump device of the fifth invention is glass, and the metal oxide micro thin film is made of zirconium oxide or titanium oxide excellent in vitrification and crystallization. The main component was used.

  With this material composition, due to a synergistic effect, the adhesion between the electrically insulating bonding material and the holding plate and the electrical insulation are further improved.

  In the oxygen pump device of the eighth invention, the electrically insulating bonding material in the oxygen pump device of the fifth invention is formed on both the metal oxide-based fine thin film side and the oxygen ion conductive solid electrolyte side. The glass was bonded.

  The electrically insulating bonding material is glass, and is formed on both the metal oxide-based fine thin film side and the oxygen ion conductive solid electrolyte side to join each other. Adhesion and electrical insulation are further improved.

  In the oxygen pump device of the ninth invention, the electrically insulating bonding material in the oxygen pump device of the seventh or eighth invention is crystallized glass.

  When the electrically insulating bonding material is crystallized glass, the adhesion between the electrically insulating bonding material and the holding plate and the electric insulation are further improved.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, this invention is not limited by the form of this invention.

(Embodiment 1)
In FIG. 1, a voltage of several volts is applied to a cathode electrode 2 and an anode electrode 3 formed on both surfaces of an oxygen ion conductive solid electrolyte 1 by a direct current power source (not shown), whereby oxygen molecules in the air are converted into a cathode electrode. 2 to the anode electrode 3 via the oxygen ion conductive solid electrolyte 1, and 100% oxygen gas is generated on the anode electrode 3 side.

  The oxygen pump element 4 for generating oxygen is heated by a heating body 5 disposed opposite to the electrode on one side and heated to about 600 ° C., and an electrochemical reaction for generating oxygen is effectively performed. It is supposed to be.

  The oxygen pump element 4 is partitioned by a partitioning means 6 into a space on the cathode electrode 2 side (hereinafter referred to as a cathode side space) 7 and a space on the anode electrode 3 side (hereinafter referred to as an anode side space) 8. Thus, the generated 100% oxygen gas is effectively obtained.

The heating element 5 is arranged in at least one side internal space of the cathode side space 7 or the anode side space 8, and the heat insulating material 9 is arranged so as to enclose the periphery of both the spaces, thereby reducing heat dissipation. The electric power of the heating body 5 is reduced.

The holding plate 10 is a member constituting the partition means 6, and holds the oxygen ion conductive solid electrolyte 1 through the electrically insulating bonding material 11, and the oxygen ion conductive solid electrolyte 1 and the thermal expansion coefficient. Are made of substantially the same metal, and have a metal oxide fine thin film 12 on at least the surface of the heating element 5 side.

The material used as the oxygen enricher will be described. The oxygen ion conductive solid electrolyte body 1 is a zirconia-based composite metal oxide (La _0.8 Sr0.2) in which ₃ to 15 mol% of Y ₂ O ₃ or CaO is dissolved in 97 to 85 mol% of ZrO _{2 . ) (Ga 0.8 Mg 0.15 Co 0.05} ) O 3- δ or lanthanum gallate de-based composite metal oxide such _{LaGaO 3 (Ba, Sr, La} ) 2 (in 1-x Yx) 2 O _Y defect perovskite complex oxide is used.

  The cathode electrode 2 and the anode electrode 3 are formed by laminating a metal oxide electrode mainly composed of an oxygen-deficient structure or a perovskite structure or both metal oxides, and a noble metal electrode mainly composed of a noble metal laminated thereon. Use electrodes.

An oxygen-deficient structure metal oxide is a metal oxide expressed by a chemical formula in which the number of oxygen molecules is insufficient in terms of stoichiometry, and a perovskite structure metal oxide is composed of an A metal, a B metal, and oxygen. It is a complex metal oxide whose chemical formula is expressed as ABO ₃ .

Specifically, the metal oxide-based electrodes are LaCo ₃ , SmSrCox (La _0.6 Sr _0.4 ) (Co _0.2 Fe _0.8 ) O ₃ , (Sr _0.10 Ce _0.01 ) Zr. _0.89 O ₂ (La _0.6 Sr _0.4 ) MnO _3-δ (La _1-x Srx), CoO _3-δ is used.

  The noble metal electrode is a single component or a plurality of components of platinum, palladium, gold, silver, silver, rhodium, iridium, and ruthenium, and bismuth oxide may be further mixed in an amount of 1 to 6 wt% if necessary. The cathode electrode 2 and the anode electrode 3 are respectively formed on both surfaces of the oxygen ion conductive solid electrolyte 1 and constitute an oxygen pump element 4.

  The heating element 5 is an electric heater using an iron-nickel alloy or a nickel-chromium alloy, and emits a lot of infrared rays. In addition, it is desirable that the heating element 5 is disposed near the one side electrode of the oxygen pump element 4 so that the oxygen pump element 4 can receive as much infrared rays as possible. In the case where an electric insulating film is unavoidably disposed in order to ensure it, the layer height is made as thin as possible so that the oxygen pump element 4 can receive a large amount of infrared rays emitted from the heater 5.

  The heat insulating material 9 is a single material or a composite material of silica or alumina. In this embodiment, the heat insulating material 9 has air permeability so that the oxygen pump element 4 and the heating body 5 do not come into direct contact with the atmosphere. And also serves to suppress heat dissipation.

  The partition means 6 is made of metal or ceramic, and partitions the cathode side space 7 and the anode side space 8. The holding plate 10 is a part of the partition means 6 and holds the oxygen ion conductive solid electrolyte 1 constituting the oxygen pump element 4 via an electrically insulating bonding material 11 made of glass or ceramic. Therefore, the holding plate 10 is a plate or foil of a metal material whose thermal expansion coefficient is substantially the same (same within ± 15%) as that of the oxygen ion conductive solid electrolyte 1, and in particular, a metal foil of iron-chromium stainless steel is used. desirable.

The electrically insulating bonding material 11 is glass or ceramic whose thermal expansion coefficient is substantially the same (same within ± 15%) as the holding plate 10 or the oxygen ion conductive solid electrolyte 1, and ensures electrical insulation and bondability. In order to do so, it was necessary to fire at a high temperature. By firing the electrically insulating bonding material 11 at a high temperature, one large-area iron-chromium stainless steel metal foil used as the holding plate 10 is provided in advance with many small-area oxygen pump elements 4 on the metal foil. It is possible to hold and fix each of the through holes.

  The metal oxide thin film 12 is composed of at least one component such as zirconium oxide, titanium oxide, silicon oxide, aluminum oxide, copper oxide, iron oxide, tin oxide, zinc oxide, nickel oxide, manganese oxide, chromium oxide, and indium oxide. Is a fine thin film having a thickness of 20 μm to 0.2 μm and is formed in advance on the surface of the holding plate 10 on the side facing the heating element 5.

  The metal oxide fine thin film 12 is formed by a sol-gel method using a metal alkoxide as a starting material, and becomes a glassy substance by firing at 600 to 1000 ° C. The metal of the holding plate 10 and the metal oxide fine thin film 12 on the surface thereof are heat-treated by high-temperature baking accompanying the formation of the electrically insulating bonding material 11.

  With this configuration and the high-temperature heat treatment, the metal oxide fine thin film 12 absorbs infrared rays emitted from the heating body 5 and rises in temperature, and the rising heat passes through the metal holding plate 10 having excellent thermal conductivity. This is transmitted to the oxygen pump element 4.

  For this reason, the oxygen pump element 4 effectively receives the radiant heat generated from the heating body 5 and is held at a high temperature, and a temperature drop due to a large amount of air supply is suppressed. Therefore, the effect that the power consumption of the heating body 5 required to maintain the oxygen pump element 4 at a predetermined temperature is difficult to increase is produced.

  In addition, the metal oxide fine thin film 12 has a protective action such as prevention of oxidation of the holding plate 10 made of metal foil, and has an effect of improving its durability reliability. Furthermore, since the holding plate 10 that holds the oxygen pump element 4 at the same time is made of a metal foil having substantially the same thermal expansion coefficient, the oxygen pump element 16 is held elastically, and is a metal oxide type. Combined with the synergistic effect with the radiant heat receiving effect of the fine thin film 24, a more uniform temperature distribution can be obtained, and crack damage due to the temperature difference is further prevented.

  On the other hand, if the conventional product in which the metal oxide-based fine thin film 12 is not formed on the holding plate 10 is used, since the heat receiving heat of the heating element 5 is small, the heating element 5 necessary for holding the oxygen pump element 4 at a predetermined temperature is used. Power consumption increased and the frequency of crack breakage increased slightly.

  This oxygen pump device can also be used as a fuel cell. In that case, since the cathode electrode 2 becomes an air electrode, the oxygen-deficient structure, the perovskite structure, or a single electrode of a metal oxide-based electrode mainly composed of both metal oxides or a noble metal laminated thereon is a major component. This is handled by using a laminated electrode with a noble metal electrode.

  Moreover, since the anode electrode 3 becomes a fuel electrode, it corresponds using an oxygen ion conductive solid electrolyte and a mixed electrode of nickel oxide or nickel.

(Embodiment 2)
The optimization of the material of each part will be described in detail.

  First, optimization of the material of the metal used for the holding plate 10 and the material of the metal oxide fine thin film 12 will be described first.

  When the metal foil used for the holding plate 10 is made of iron-chromium stainless steel and the metal oxide fine thin film 12 is made of zirconium oxide or titanium oxide excellent in vitrification and crystallization, the radiant heat generated from the heating element 5 is effective. The oxygen pump element 4 was effectively kept at a high temperature. The effect of this radiant heat reception is remarkable as compared with the case of using a combination of other materials, and is considered to be due to the synergistic effect of both materials.

  Secondly, optimization of the material of the casing constituting the cathode side space 7 and the arrangement of the heating elements will be described.

  The casing 13 constituting the cathode side space 7 is made of a metal having excellent heat reflectivity and heat resistance such as iron-chromium stainless steel having two air pipes 14 and 15 through which air flows in, and its internal space. It is the structure which has arrange | positioned the heating body 5 to.

  Thus, since the cathode side space 7 in which the heating element 5 is arranged is enclosed by the housing 13, the heat insulating material 9 that further encloses the housing 13 from the outside does not require air permeability and only suppresses heat radiation. I try to carry it.

  With this configuration, the metal that is the material of the housing 13 reflects the radiant heat emitted from the heating body 5, and the metal oxide fine thin film 12 effectively receives the reflected heat, so that the oxygen pump element 4 is High temperature could be effectively maintained.

  Further, the convection heat generated from the heating body 5 is also reversed by the metal of the housing 13 and is confined, so that the oxygen pump element 4 can be held at a high temperature more effectively. This heat receiving effect of radiant heat and convection heat is more remarkable than that in the case where a heat insulating material is used without using a metal, and it is considered to be due to the effect of the metal.

  Thirdly, the material of the casing that constitutes the anode side space will be described.

  The casing 16 constituting the anode side space 8 is made of a metal excellent in heat reflectivity and heat resistance such as iron-chromium stainless steel having a gas discharge pipe 17 through which at least oxygen-related product gas passes.

  Further, since the anode side space 8 is enclosed by a casing 16 except for the gas discharge pipe 17 through which oxygen-related product gas passes, the heat insulating material 9 that further encloses the casing 16 from the outside needs to be breathable. Instead, it is supposed to be responsible only for suppressing heat dissipation.

  With this configuration, the metal of the casing 16 reflects the radiant heat emitted from the oxygen pump element 4 held at a high temperature, and the reflected heat is effectively received by the oxygen pump element 4 to further increase the temperature. Could be maintained at a high temperature.

  Further, since the convection heat is also reversed by the metal of the casing material 16 and the heat is confined, the oxygen pump element 4 can be held at a high temperature more effectively. This heat receiving effect of radiant heat and convection heat is more remarkable than that in the case where a heat insulating material is used without using a metal, and it is considered to be due to the effect of the metal.

  Next, the formation direction of the metal oxide fine thin film 12 on the holding plate 10 will be described.

When the metal oxide-based fine thin film 12 is formed on the holding plate 10 on the side holding the oxygen ion conductive solid electrolyte 1, adhesion between the electric insulating bonding material 11 made of glass or ceramic and the holding plate 10, and electric insulation Improved. The effect of improving the adhesion and electrical insulation is due to the metal oxide fine thin film 1
This is conspicuous as compared with the case of using a conventional product in which 2 is not formed, and is considered to be due to the effect of the configuration.

  In addition, the formation direction of the metal oxide fine thin film 12 on the holding plate 10 will be further described.

  When the metal oxide fine thin film 12 is formed on both surfaces of the holding plate 10, it is possible to receive radiant heat emitted from the heating body 5, and to improve the adhesion and electrical insulation between the electrically insulating bonding material 11 and the holding plate 10. One problem can be solved easily with a simple design.

  The optimization of the material of the electrically insulating bonding material 11 and the material of the metal oxide fine thin film 12 when the metal oxide fine thin film 12 is formed on the holding plate 10 will be described.

  When the electrically insulating bonding material 11 is glass and the metal oxide fine thin film 12 is mainly composed of zirconium oxide or titanium oxide excellent in vitrification and crystallization, the electrical insulating bonding material 11 and the holding plate 10 Adhesion and electrical insulation are further improved.

  The effect of improving the adhesion and electrical insulation is remarkable as compared with the case of using a combination of other materials, and is considered to be due to the synergistic effect of both materials.

  Further, optimization of the material and configuration of the electrically insulating bonding material 11 when the metal oxide thin film 12 is formed on the holding plate 10 will be described.

  If the electrically insulating bonding material 11 is glass and is a material formed on both the metal oxide-based fine thin film 12 side and the oxygen ion conductive solid electrolyte 1 side and bonded to each other, the electrically insulating bonding material 11 The adhesion and electrical insulation between the material 11 and the holding plate 10 are further improved. The effect of improving the adhesion and electrical insulation is remarkable as compared with the case where the electrical insulating bonding material 11 is formed only on one side, and this effect of the components formed on both is electrically insulating. This is presumably because of the effect that the thickness of the bonding material 11 is large and the effect resulting from the synergistic effect of bonding the same material on both.

  Further, the material of the electrically insulating bonding material 11 when the metal oxide fine thin film 12 is formed on the holding plate 10 will be further described. If the electrically insulating bonding material 11 is crystallized glass, a dense crystallized film can be obtained. Therefore, the adhesion and the electric insulating properties between the electrically insulating bonding material 11 and the holding plate 10 are further improved. The effect of improving the adhesion and electric insulation is remarkable as compared with the case where ordinary glass is used for the electric insulating bonding material 11, and is considered to be due to the effect caused by the effect of crystallized glass.

  In the second embodiment, the same reference numerals are given to configurations that exhibit the same action as in FIG. 1, and the description of the first embodiment is used for the description.

  The pump device of the present invention can be applied to applications such as an oxygen concentrator using an oxygen ion conductive solid electrolyte and a fuel cell system.

Configuration diagram of an oxygen pump device according to Embodiment 1 of the present invention The block diagram of the oxygen pump apparatus which is Embodiment 2 of this invention Configuration diagram of conventional oxygen pump device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oxygen ion conductive solid electrolyte 2 Cathode electrode 3 Anode electrode 4 Oxygen pump element 5 Heating body 6 Partitioning means 7 Cathode side space 8 Anode side space 9 Heat insulating material 10 Holding plate 11 Electrical insulating bonding material 12 Metal oxide system thin film 13 Case 14 constituting the cathode side space 14, 15 Air pipe 16 Case constituting the anode side space 17 Gas exhaust pipe

Claims (9)

An oxygen pump element having a cathode electrode and an anode electrode formed on both surfaces of the oxygen ion conductive solid electrolyte; partition means for partitioning a cathode side space and an anode side space of the oxygen pump element; and the cathode side space or the anode side space A heating element that heats the oxygen pump element disposed in at least one side internal space, and a heat insulating material disposed so as to enclose the periphery of the cathode side space and the anode side space. A holding plate for holding the oxygen ion conductive solid electrolyte via an electrically insulating bonding material is made of a metal having substantially the same thermal expansion coefficient as that of the oxygen ion conductive solid electrolyte, and at least the heating body Oxygen pump device in which a metal oxide fine thin film is formed on the surface opposite the surface. The oxygen pump device according to claim 1, wherein the holding plate is a ferritic stainless steel foil, and the metal oxide fine thin film is mainly composed of zirconium oxide or titanium oxide. The oxygen pump device according to claim 1, wherein the casing constituting the cathode side space is made of a metal material having two air pipes through which air flows in and passes, and a heating body is arranged in the internal space. 2. The oxygen pump device according to claim 1, wherein the casing constituting the anode side space is made of a metal material having a gas discharge pipe through which at least an oxygen-related product gas passes. The oxygen pump device according to claim 1, wherein the metal oxide thin film is formed on a holding plate on a side holding the oxygen ion conductive solid electrolyte. The oxygen pump device according to claim 1, wherein the metal oxide thin film is formed on both surfaces of the holding plate. 6. The oxygen pump device according to claim 5, wherein the electrically insulating bonding material is glass, and the metal oxide fine thin film is mainly composed of zirconium oxide or titanium oxide. 6. The oxygen pump device according to claim 5, wherein the electrically insulating bonding material is glass formed on both the metal oxide-based fine thin film side and the oxygen ion conductive solid electrolyte side and bonded to each other. The oxygen pump device according to claim 7 or 8, wherein the electrically insulating bonding material is crystallized glass.

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