JP2006133106A - Oxygen pump element and oxygen supply device using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oxygen pump element in which local temperature unevenness is suppressed. <P>SOLUTION: This oxygen pump element comprises positive and negative electrode films 17 and 18 formed on both side of a solid electrolyte 16, and metal foil members 21 and 25 connected to the positive and element electrode films 17 and 18. The metal foil member 21 is formed larger than the other and constituted as a partition means partitioning a space part with which the solid electrolyte makes contact, a glass ceramic film 23 is arranged on one surface part of at least either the metal foil members 21 or 25, and a heater resistor 24 is arranged on the glass ceramic film 23. According to this, the solid electrolyte 16 is heated through the metal foil member 21 by the heater resistor 24, and the temperature of the solid electrolyte can be raised to an operation temperature which is necessary for oxygen ion conduction with a small power energy. Since the heater resistor 24 is adjacent, the power energy necessary for keeping the operation temperature can be also minimized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an oxygen pump element using an oxygen ion conductive solid electrolyte and an oxygen supply device using the same.

  Conventionally, this kind of oxygen pump element is already known (see, for example, Patent Document 1). As shown in FIG. 7, the oxygen pump element is configured by forming electrode films 2 and 3 on both sides of the oxygen ion conductive substrate 1. Lead members 4 and 5 are respectively taken out from specific portions of the electrode films 2 and 3 and connected to a power source (not shown). The oxygen ion conductive substrate 1 is held by a support material 6.

  Moreover, this kind of oxygen supply apparatus is already known (for example, refer patent document 2). As shown in FIG. 8, the oxygen pump element 7 is composed of a first electrode film 9, an oxygen ion conductor thin film 10, and a second electrode film 11 formed on a porous substrate 8 such as alumina. The first electrode film 9 has a structure in which platinum fine particles are bonded to the porous substrate 8 and the second electrode film 11 is formed by bonding the platinum fine particles to the oxygen ion conductor thin film 10 to form a thin film. The heating unit 12 includes a heater print film 14 formed by patterning a conductive paste on an insulating substrate 13 such as an alumina substrate by screen printing. The heating unit 12 is not included in the housing 15 and is in the atmosphere. Arranged in a released state.

In this configuration, when the oxygen pump element 7 is heated to a temperature at which the oxygen pump element 7 operates as an oxygen pump by the heating means 12 and a DC voltage is applied between both electrode films using the first electrode film 9 as a cathode and the second electrode film 11 as an anode, As indicated by arrows in the figure, oxygen in the air dissociated and adsorbed on the first electrode film 9 moves as oxygen ions in the thin film 10 of the oxygen ion conductor and is carried to the second electrode film 11 to become oxygen molecules. Released into the atmosphere. As a result, the oxygen concentration in the container attached to the housing 15 can be reduced.
JP 2000-86204 A Japanese Patent Laid-Open No. 11-23525

  However, in the oxygen pump element of Patent Document 1, the amount of heat during operation of the oxygen pump element is concentrated on the lead members 4 and 5, and local temperature unevenness occurs on the oxygen ion conductive substrate 1. There was a problem that the conductive substrate 1 was cracked. For this reason, there has been a problem of how to disperse the large heat generated during the operation of the oxygen pump element evenly and to provide a long-term guarantee for the portion.

  Further, in the oxygen supply device of Patent Document 2, since the oxygen pump element 7 and the heating means 12 are released to the atmosphere, the heat energy from the heating means 12 is not only from the oxygen pump element 7 but also from the air in the atmosphere. It is also used for heating. As a result, the thermal efficiency is deteriorated, the power consumption of the heating means 12 required to raise the temperature to the temperature at which the oxygen pump element 7 is operated increases, and oxygen ions are transported by the oxygen pump element 7. It had the problem of poor efficiency. Further, since the heating means 12 is arranged on the upper part of the oxygen pump element 7, the oxygen pump element 7 has a problem that most of the radiant heat is used and the convection heat of the heated air cannot be used.

  The present invention solves the above-mentioned conventional problems, and an oxygen pump element that suppresses local temperature unevenness generated in the oxygen pump element and heat from the heating means are efficiently transmitted to the oxygen pump element, An object of the present invention is to provide an oxygen supply device that reduces the power required for the operation.

  In order to solve the conventional problems, an oxygen pump element of the present invention includes an oxygen ion conductive solid electrolyte, positive and negative electrode films formed on both sides of the solid electrolyte, and the positive and negative electrode films. A metal foil member bonded to each of the outer peripheral portions, and the metal foil member is configured as a partitioning means for partitioning a space portion in contact with the solid electrolyte by making either one larger than the other, and at least one of the metal foil members A glass ceramic film is disposed on one side portion, and a heater resistor is disposed on the glass ceramic film.

  As a result, the solid electrolyte is heated by the heater resistor provided on the outer periphery through the metal foil member. When the area of the solid electrolyte is small, the solid electrolyte is required for oxygen ion conduction with a small electric energy. The temperature can be rapidly raised to the operating temperature. In addition, since they are close to each other, the electric power energy required to maintain the operating temperature can be reduced.

  Further, the oxygen supply device of the present invention comprises a voltage applying means for applying a voltage to the oxygen pump element, a voltage control means for controlling the voltage applying means, and a heater for applying a voltage to the heater resistor of the oxygen pump element. A heating means, a temperature control means for detecting the temperature of the solid electrolyte in the oxygen pump element to control the heating means, a breathable heat insulating means for preventing thermal diffusion of the heating means and the oxygen pump element, and an oxygen pump element. And a mixing means for mixing the oxygen generated through the air with the air to form a mixed gas having a predetermined oxygen concentration.

  As a result, the heat from the heating means can be efficiently transmitted to the oxygen pump element, and the power required for heating can be reduced.

  The oxygen pump element of the present invention and the oxygen supply device using the oxygen pump element efficiently transmit the heat from the oxygen pump element and the heating means to a local temperature unevenness and the electric power necessary for heating. A reduced oxygen supply device can be obtained.

  The first invention comprises an oxygen ion conductive solid electrolyte, positive and negative electrode films formed on both sides of the solid electrolyte, and metal foil members respectively joined to the outer periphery of the positive and negative electrode films. The metal foil member is configured as a partition means for partitioning a space where the solid electrolyte is in contact with one of the metal foil members larger than the other, and a glass ceramic film is disposed on at least one side of the metal foil member. In addition, by using an oxygen pump element in which a heater resistor is disposed on the glass ceramic film, the solid electrolyte is heated by the heater resistor provided on the outer peripheral portion through the metal foil member. Thus, when the area of the solid electrolyte is small, the solid electrolyte can be rapidly heated to an operating temperature required for oxygen ion conduction with a small electric energy. In addition, since they are close to each other, the electric power energy required to maintain the operating temperature can be reduced.

  In the second invention, in particular, in the first invention, a conductive film is formed at a joint portion between the positive and negative electrode films and each metal foil member, and the lead member connected to the conductive film is on the side of the small metal foil member. When used as an oxygen pump element, a large current flows between the positive and negative electrode films and the conductive film. However, the large amount of heat generated at this time has a predetermined width. The conductive film can prevent oxidative corrosion of the metal foil member. Further, by taking out the lead member from one direction, the power supply circuit necessary for oxygen ion conduction can be collectively limited in one direction, so that the layout configuration of the apparatus can be simplified.

  The third invention, in particular, in the first or second invention, since the metal foil member is a ferritic stainless steel containing aluminum, it has excellent characteristics against high-temperature oxidation, and is around 800 ° C. Can maintain stable characteristics for long-term use.

  In particular, according to the fourth invention, in any one of the first to third inventions, the thickness of the metal foil member is 5 to 20 μm, so that the heat generated by the heater resistor is passed through the metal foil member. It is possible to suppress unnecessary heat diffusion to the outer peripheral portion.

  According to a fifth invention, in particular, in any one of the first to fourth inventions, the glass ceramic film is a SiO 2 —B 2 O 3 —MgO—BaO system and contains 15 to 25 wt% of an alkaline earth metal oxide. By being a crystallized glass containing 2 wt% or less of a metal oxide, firing to about 800 ° C. results in a glass ceramic film that is crystallized to some extent, and can maintain sufficient adhesion to the metal foil member. In addition, insulation between the heater resistor and the metal foil member can be sufficiently maintained. Further, even when the surface of the metal foil becomes high temperature due to a large current, it is possible to prevent oxidative corrosion.

  The sixth invention is particularly large in the conductive film formed on the metal foil member because the width of the conductive film or the width of the glass ceramic film is 3 to 7 mm in any one of the first to fifth inventions. Oxygen corrosion can be prevented even when the vicinity of the junction with the positive and negative electrode films becomes locally high due to the current flowing, and the long-term stability of the oxygen pump element can be improved.

  The seventh invention is a perovskite type composite metal oxide mainly comprising lanthanum and gallium because the solid electrolyte is lanthanum gallate in any one of the first to sixth inventions. And oxygen ion conductivity at 400 ° C. or higher. Therefore, since sufficient capability can be obtained by maintaining the operating temperature of the oxygen pump element at a relatively low temperature of about 600 ° C., deterioration of the oxygen pump element can be suppressed even in the long term.

  In particular, the eighth invention relates to the oxygen pump element according to any one of the first to seventh inventions, voltage application means for applying a voltage to the oxygen pump element, and voltage control means for controlling the voltage application means. Heating means for applying a voltage to the heater resistor of the oxygen pump element and heating; temperature control means for detecting the temperature of the solid electrolyte in the oxygen pump element to control the heating means; and the heating means and oxygen pump element Heating is achieved by providing an oxygen supply device including a breathable heat insulating means for preventing thermal diffusion and a mixing means for mixing oxygen generated through an oxygen pump element with air to form a mixed gas having a predetermined oxygen concentration. The heat from the means can be efficiently transmitted to the oxygen pump element, and the electric power required for heating can be reduced.

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

(Embodiment 1)
1 to 4 show an oxygen pump element and an oxygen supply apparatus using the same according to Embodiment 1 of the present invention.

1 and 2, the oxygen ion conductive solid electrolyte 16 is made of a sintered lanthanum gallate (La _0.8 Sr _0.2 Ga _0.8 Mg _0.2 O ₃ ) sintered body having an arbitrary thickness. In particular, it has a shape of 20 × 20 mm and a thickness of 100 μm. A positive electrode film 17 and a negative electrode film 18 are formed on both surfaces of the solid electrolyte 16 so as to exhibit oxygen ion conductivity.

For the positive electrode film 17 and the negative electrode film 18, a perovskite complex oxide having conductivity was used. Specifically, a paste obtained by mixing Sm _0.5 Sr _0.5 CoO ₃ with a cellulosic vehicle, which is an organic solvent, forms a printed film by screen printing, and after drying, is fired at 1100 ° C. Positive and negative electrode films 17 and 18 having a thickness of about 10 μm were formed.

  Further, Au porous conductive films 19 and 20 were laminated on the surfaces of the positive electrode film 17 and the negative electrode film 18. In this case, a printed film was formed by screen printing using Au paste, dried, and baked at 800 ° C. to obtain a conductive film having a thickness of about 3 μm. The conductive films 19 and 20 can improve the surface distribution unevenness of the solid electrolyte with respect to the potential when a voltage is applied between the positive and negative electrode films 17 and 18.

  On the negative electrode film 18 side, a metal foil member 21 having conductivity is joined to the outer periphery thereof. As the metal foil member 21, Fe-20Cr-5Al, 10 [mu] m is used, and an opening (see FIG. 2) is provided at the center so that the negative electrode film 18 side is exposed. A conductive film 22 is formed on one surface of the inner periphery where the metal foil member 21 is joined to the solid electrolyte 16. For the conductive film 22, a printed film is formed by screen printing using AgPd (Ag: Pd = 95: 5) paste, dried and then fired at 800 ° C. to form a conductive film having a thickness of about 3 μm and a width of 5 mm. did.

  Further, a glass ceramic film 23 is formed on the other side surface of the metal foil member 21. For the glass ceramic film 23, a crystallized glass containing SiO 2 -B 2 O 3 -MgO—BaO and containing 20 wt% of an alkaline earth metal oxide and about 1.0 wt% of an alkali metal oxide was used. The glass ceramic material is first melted at 1300 ° C., then processed into a cullet state by a roll cooler, and then further pulverized to a predetermined particle size by a ball mill or the like. The crushed glass particles were processed into a printing paste. Since the crystallization start temperature of the crystallized glass is about 770 ° C., the crystallization proceeds to some extent when baked at 800 ° C. after printing, and the glass ceramic film 23 having high thermal shock resistance is formed.

  Further, a heater resistor 24 is disposed on the glass ceramic film 23. As the heater resistor 24, AgPd (Ag: Pd = 70: 30) paste with 10 wt% of crystallized glass particles constituting the glass ceramic film 23 was used. Similarly, it was formed by baking at 800 ° C. after drying. The state seen from the negative electrode film 18 side of the oxygen pump element is shown in FIG.

  The positive electrode film 17 side is also connected to a conductive metal foil member 25. Also here, the same AgPd (Ag: Pd = 95: 5) paste material as that on the negative electrode film 18 side is used, an opening is provided so that the positive electrode film 17 side is exposed, and the metal foil member 25 is connected to the solid electrolyte 16. Conductive films 26 and 27 are formed on both surfaces to be joined. The metal foil member 21 disposed on the negative electrode film 18 side is larger than the metal foil member 25 disposed on the positive electrode film 17 side, and is configured as a partitioning means for partitioning a space portion in contact with the solid electrolyte 16. The metal foil members 21 and 25 are joined to the conductive film 19 on the positive electrode film 17 side and the conductive film 20 on the negative electrode film 18 side through conductive layers 28 and 29. The conductive layer 28 is made of Au paste, dried, and baked at 800 ° C., so that the conductive layer having a thickness of about 4 μm is formed to be electrically connected to the conductive films 26 and 27 of the metal foil member 25. Also, the conductive layer having a thickness of about 4 μm was formed so as to be electrically connected to the conductive film 22 of the metal foil member 21 by using Au paste and drying and baking at 800 ° C.

  The lead member 30 is connected from the conductive film 22 side formed on the metal foil member 21, and the lead member 31 is connected from the conductive film 27 side formed on the metal foil member 25. Further, the insulating member 32 prevents the metal foil member 25 from being short-circuited with the metal foil member 21. As the insulating member 32, a mica sheet having a thickness of 0.2 mm was used. The lead members 30 and 31 are arranged in the same direction with respect to the surface of the solid electrolyte 16, that is, the lead members 30 and 31 are arranged so as to be taken out from the smaller metal foil member 25 side. A simple layout configuration can be simplified.

  FIG. 4 shows an oxygen supply apparatus using the oxygen pump element shown in FIGS.

  The periphery of the metal foil member 21 that serves as a partition means for the solid electrolyte 16 is fixed to a support 34. And it is sealed with an electrically insulating gas sealant 33.

  Further, voltage application means 35 is connected to the positive electrode film 17 side and the negative electrode film 18 side via a lead member (the position is different from FIG. 1 but the operation is the same). The voltage control means 36 is connected.

  The heating means 37 is connected to apply a voltage to the heater resistor 24 of the oxygen pump element, and a temperature control means 38 having means 38 a for detecting the temperature of the solid electrolyte 16 sends a signal to the heating means 37.

  The means 38a for detecting the temperature of the solid electrolyte 16 may be a temperature sensor or another method. In the case of a sensor, the sensor may be disposed in the vicinity of the solid electrolyte 16 or may be disposed at an arbitrary position. Depending on the temperature of the solid electrolyte 16 detected by the temperature control means 38, the temperature control means 38 controls the input to the heater resistor 24 via the heating means 37.

  The heat insulating means 39 and 40 are air-permeable heat insulating members for suppressing heat loss generated in the heater resistor 24. Here, the heat insulating material shape | molded in the flat form which has a silica and an alumina as a main component was used. Each element constituting the oxygen supply apparatus and the container 41 for maintaining the overall shape are provided with an opening 42 for ventilation on the negative electrode film 18 side.

  A gas mixing means 44 is connected to the container 41 on the positive electrode film 17 side through a vent 43. The mixing unit 44 includes a gas induction pipe 45, a mixed gas introduction pipe 46, a gas mixer 47, and a gas pump 48.

  About the oxygen supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the oxygen supply device is placed in the atmosphere such as room air. At this time, atmospheric components such as nitrogen and oxygen (hereinafter simply referred to as nitrogen and oxygen) pass through the inside of the heat insulating means 39 and 40 which are breathable heat insulating materials, and the positive electrode film 17 side and the negative electrode film 18. Stable in a diffused state to the surface on the side.

  In this state, when the heater resistor 24 is energized by the temperature control means 38, the temperature of the solid electrolyte 16 in the heat insulation means 39 and 40 rises. The temperature control means 38 is energized while controlling the heater resistor 24 so that the temperature required for the operation of the solid electrolyte 16 is about 600 ° C. However, this temperature is not limited, and an operation at an arbitrary temperature is possible according to the characteristics of the solid electrolyte 16. In this case, the solid electrolyte could be brought to 600 ° C. in about 40 seconds by using 20 W of power for the heater resistor 24. In a steady state, the electric power necessary for maintaining 600 ° C. was 12 W.

  When a voltage is applied to the solid electrolyte 16 through the positive electrode film 17 and the negative electrode film 18 when the temperature at which the solid electrolyte 16 can conduct ions is reached, oxygen near the surface on the negative electrode film 18 side becomes electrochemical. Due to the reaction, the inside of the solid electrolyte 16 moves from the negative electrode film 18 to the positive electrode film 17 as oxygen ions, and is released as oxygen molecules from the surface on the positive electrode film 17 side.

  At this time, a low voltage and large current flows through the solid electrolyte 16, and self-heat is generated by flowing a large current through the solid electrolyte 16 with the applied voltage. Therefore, the metal foil members 21 and 25 used are also exposed to a high temperature state in addition to the atmospheric temperature of 600 ° C. The conductive films 22 and 27 formed on the surfaces of the metal foil members 21 and 25 improve the current collecting ability against a large current and can effectively protect against the surface oxidation of the metal foil members 21 and 25. did it. In order to prevent the high temperature oxidation by forming the conductive films 22 and 27 on the surfaces of the metal foil members 21 and 25, at least 3 mm width is required in the outer peripheral direction from the joint portion with the positive and negative electrode films 17 and 18. there were. Moreover, since the waste of an expensive material will be caused even if it is too wide, practically, the width of the conductive films 22 and 27 formed on the surfaces of the metal foil members 21 and 25 is preferably 3 to 7 mm. it is conceivable that. The same applies to the width of the glass ceramic film 23.

  The vicinity of the surface of the positive electrode film 17 is in a state close to pure oxygen. However, as long as gas leakage cannot be completely prevented, the oxygen is separated from the surface of the positive electrode film 17 and the discharged oxygen is naturally mixed with the leaked gas. The Therefore, the metal foil member 21 and the gas sealant 33 which are means for partitioning the space effectively act as means for preventing gas leakage from the negative electrode film 18 side.

  On the other hand, nitrogen is left on the negative electrode film 18 side. The remaining nitrogen diffuses into the atmosphere due to the air permeability of the heat insulating means 39, and new oxygen is supplied from the outside to the negative electrode film 18 side.

  The oxygen gas released from the positive electrode film 17 passes through the vent 43 and constitutes the gas mixing means 44, thereby forming a gas to be mixed by the gas induction pipe 45, the mixed gas introduction pipe 46, and the gas mixer 47. Mixed with. In the present embodiment, the mixed gas is the atmosphere. The generated mixed gas is an oxygen-enriched gas, and its flow rate is determined by the suction and discharge speeds of the gas pump 48.

  The oxygen concentration in the mixed gas is determined by the mixed gas flow rate and the amount of oxygen ions flowing through the solid electrolyte 16, that is, the magnitude of the ionic current. The ion current can be controlled by the magnitude of the voltage applied to the solid electrolyte 16.

  Finally, the oxygen concentration in the mixed gas obtained by the oxygen supply device of the present embodiment is executed by voltage control by the voltage control means 36 and control of the mixed gas flow rate by the gas pump 48.

  As described above, in the present embodiment, the solid electrolyte 16, the positive electrode film 17 side, and the negative electrode film 18 side are coupled so as to exhibit oxygen ion conductivity, and the space portion is partitioned via the solid electrolyte 16. The gas leakage is suppressed by the means, the heating temperature is raised and the voltage is applied, whereby oxygen molecules are released from the positive electrode film 17 and a mixed gas enriched with oxygen is generated. By controlling the mixed gas flow rate by the gas pump 48, an arbitrary oxygen concentration gas can be stably obtained.

  As a comparative example with the present embodiment, when the solid electrolyte 16 is indirectly heated by a ribbon heater with the same configuration, the power of 40 W is used for the ribbon heater at the time of start-up, so that the solid electrolyte 16 can be obtained in about 40 seconds. The power required to maintain 600 ° C. in steady state was 28 W. Thereby, the oxygen pump element of the present embodiment can rapidly raise the solid electrolyte 16 to the operating temperature necessary for oxygen ion conduction with a small electric power energy. In addition, since they are close to each other, the electric power energy necessary for maintaining the operating temperature can be reduced.

(Embodiment 2)
FIG. 5 shows an oxygen pump element according to Embodiment 2 of the present invention. The same elements as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the present embodiment, the conductive film 50 and the glass ceramic film 51 are provided on the metal foil member 49 connected to the positive electrode film 17 side, and the heater resistor 52 is provided on the glass ceramic film 51. Accordingly, the two metal foil members 21 and 49 connected to the solid electrolyte 16 are heated from both sides.

  With such a configuration, the input to the heater resistors 24 and 52 is dispersed and heat is supplied from both sides of the outer periphery of the solid electrolyte 16 so that the temperature is more uniform. In this case, the solid electrolyte 16 could be brought to 600 ° C. in about 40 seconds by using 18 W of power for the heater resistors 24 and 52.

(Embodiment 3)
FIG. 6 shows an oxygen pump element according to Embodiment 3 of the present invention. Since the basic configuration is the same as in the first and second embodiments, the description thereof is omitted.

  In the present embodiment, a glass ceramic film 54 is provided on the metal foil member 53 to be joined to the negative electrode film 18 side, and the heater wire double surrounds the outer periphery of the solid electrolyte on the glass ceramic film 54. A heater resistor 55 is provided.

  By setting it as such a structure, the heat supplied to the solid electrolyte 16 from the resistor 55 for heaters will be equalized more.

  As described above, in each of the first to third embodiments, the glass ceramic films 23, 51, and 54 contain 15 to 25 wt% of an alkaline earth metal oxide in the SiO 2 —B 2 O 3 —MgO—BaO system, and the oxide of the alkali metal However, the present invention is not limited to this. Sufficient insulation with the metal foil members 21, 49, 53 can be maintained, and the material used for the conductive films 22, 50 and the heater resistors 24, 52, 55 and the processing temperature in the manufacturing process do not cause problems. I just need it. By suppressing the oxide content of the alkali metal, the properties of the glass are increased in temperature, and the crystallization start temperature can be set at 750 to 800 ° C. by setting the content of the alkaline earth metal oxide to 15 to 25 wt%. It was. As a result, the heat treatment temperature condition can be made almost the same as that of the Au paste or AgPd paste.

  In each embodiment, lanthanum gallate is used as the solid electrolyte 16, but the lanthanum gallate is not limited to this, and may be yttrium-doped zirconia (YSZ), samarium-doped ceria (SDC), or the like. However, at present, the lanthanum gallate-based material has a low operating temperature as an oxygen ion conductor, so that it can be said to be the most preferable material in view of the durability of the material.

  Moreover, in each embodiment, although the material of Fe-20Cr-5Al was used as the metal foil members 21, 25, 49, 53, it is not limited to this, and any material having durability against high-temperature oxidation may be used. Other metal foil materials can be used. However, at present, ferritic stainless steel containing aluminum has excellent characteristics against high-temperature oxidation. Furthermore, it is possible to add a rare earth metal for the purpose of improving high temperature oxidation resistance. Moreover, although 10 micrometers in thickness was used, it is thought that 5-20 micrometers is preferable as a metal foil member. In other words, it is preferable that the thickness is as small as possible so that the heat generated by the heater resistors 24, 52 and 55 is not diffused toward the outer periphery. However, if the thickness is 5 μm or less, the handling at the time of manufacture becomes worse.

  In each embodiment, the metal foil members 21, 25, 49, and 53 are configured to be joined to the negative electrode film 18 side, and the solid electrolyte 16 is used as partitioning means for partitioning the space. However, the direction of joining to the positive electrode film 17 side may be increased.

  In each embodiment, Au type and AgPd type are used as the conductive films 22, 26, 27, 50, and 51. However, the invention is not limited to this, and any other material having a low resistance and heat resistance may be used. Can also be used. Moreover, although the case where the electrically conductive films 19 and 20 were arrange | positioned further to the positive and negative electrode films | membranes 17 and 18 on the surface of the solid electrolyte 16 was demonstrated, the structure which does not arrange | position this electrically conductive film is applicable.

  As described above, the oxygen pump element and the oxygen supply device using the oxygen pump element according to the present invention efficiently transmit the heat from the oxygen pump element and the heating means to the oxygen pump element with suppressed local temperature unevenness, Since an oxygen supply device that reduces the power required for heating can be obtained, the oxygen supply device can be applied to a wide range of uses such as air purifiers, air conditioners, health promotion devices, health promotion devices, and medical devices that use oxygen.

Sectional drawing of the oxygen pump element in Embodiment 1 of this invention Exploded perspective view of the oxygen pump element Plan view of the oxygen pump element viewed from the negative electrode side Sectional view of an oxygen supply device using the oxygen pump element Sectional drawing of the oxygen pump element in Embodiment 2 of this invention The top view which looked at the oxygen pump element in Embodiment 3 of this invention from the negative electrode side Sectional view showing a conventional oxygen pump element Sectional view showing a conventional oxygen supply device

Explanation of symbols

16 Solid Electrolyte 17 Positive Electrode Film 18 Negative Electrode Film 21, 25, 49, 53 Metal Foil Member 22, 26, 27, 50, 51 Conductive Film 23, 51, 54 Glass Ceramic Film 24, 52, 55 Heater Resistor 30 , 31 Lead member 39, 40 Thermal insulation means 44 Mixing means

Claims (8)

A metal foil member comprising: an oxygen ion conductive solid electrolyte; positive and negative electrode films formed on both sides of the solid electrolyte; and metal foil members respectively joined to the outer peripheral portions of the positive and negative electrode films Is configured as a partition means for partitioning a space portion in contact with the solid electrolyte by making one larger than the other, and a glass ceramic film is disposed on at least one side portion of the metal foil member. An oxygen pump element having a heater resistor disposed on the film. 2. The oxygen pump element according to claim 1, wherein a conductive film is formed at a joint portion between the positive and negative electrode films and each metal foil member, and a lead member connected to the conductive film is taken out from a small metal foil member side. . The oxygen pump element according to claim 1 or 2, wherein the metal foil member is ferritic stainless steel containing aluminum. The oxygen pump element according to claim 1, wherein the metal foil member has a thickness of 5 to 20 μm. The glass ceramic film is a crystallized glass of SiO2-B2O3-MgO-BaO system containing 15 to 25 wt% of an alkaline earth metal oxide and 2 wt% or less of an alkali metal oxide. The oxygen pump element according to any one of claims. The oxygen pump element according to any one of claims 1 to 5, wherein the width of the conductive film or the width of the glass ceramic film is 3 to 7 mm. The oxygen pump element according to any one of claims 1 to 6, wherein the solid electrolyte is lanthanum gallate. The oxygen pump element according to any one of claims 1 to 7, voltage applying means for applying a voltage to the oxygen pump element, voltage control means for controlling the voltage applying means, and a heater for the oxygen pump element Heating means for applying a voltage to the resistor to heat it, temperature control means for controlling the heating means by detecting the temperature of the solid electrolyte in the oxygen pump element, and air permeability for preventing thermal diffusion of the heating means and the oxygen pump element An oxygen supply device comprising: a heat insulating means; and a mixing means for mixing oxygen generated through an oxygen pump element with air to form a mixed gas having a predetermined oxygen concentration.

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