JP2006008457A - Oxygen pumping device and oxygen supplying apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a period of time capable of supplying oxygen by improving rising characteristics of an oxygen pumping device. <P>SOLUTION: The oxygen pumping device is equipped with at least an oxygen ion conductive solid electrolyte 16, electrode membranes 17, 18 which are formed on the both surface of the oxygen ion conductive solid electrolyte 16 and constitute positive and negative electrodes, and lead members 29, 30 derived from the electrode membranes 17, 18. In the oxygen pumping device, a setting voltage A is applied at initial driving time, and thereafter the applied voltage is reduced, and at steady operation time, the oxygen pumping device is operated at a setting voltage B. Thereby, the rise time after that it becomes possible to supply oxygen can be more shortened. <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 equipped with the element.

  Conventionally, as this type of oxygen pump element, an oxygen pump element shown in FIG. 6 has been disclosed (see, for example, Patent Document 1). 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 from the respective electrode films and connected to a power source (not shown). The oxygen ion conductive substrate 1 is held by a support material 6.

  Moreover, as this type of oxygen pump element device, there is one as shown in FIG. 7 (see, for example, Patent Document 2). In FIG. 7, the oxygen pump element 7 includes a first electrode 9 formed on a porous substrate 8 such as alumina, a thin film 10 of oxygen ion conductor, and a second electrode 11, and the first electrode film 9 is made of platinum. These fine particles are formed on the porous substrate 8, and the second electrode 11 has a structure in which a thin film obtained by combining platinum fine particles with the thin film 10 of the oxygen ion conductor is formed. 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 electrodes using the first electrode 9 as a cathode and the second electrode 11 as an anode, As shown in FIG. 5, oxygen in the air dissociated and adsorbed by the first electrode 9 moves as oxygen ions in the thin film 10 of the oxygen ion conductor and is carried to the second electrode 11 to be released into the atmosphere as oxygen molecules. The Thereby, 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 concentrates on the lead members 4 and 5 and local temperature spots are generated on the oxygen ion conductive substrate 2. There was a problem that cracking occurred. For this reason, there has been a problem of how to disperse the large heat generated during the operation of the oxygen pump element without any unevenness and to provide a long-term guarantee for that portion. Although there is no specific description about the timing of the voltage applied to the element, it is generally applied after the oxygen pump element is heated to a predetermined temperature.

  Further, in the configuration of the oxygen pump device of Patent Document 2, since the oxygen pump element 7 and the heating means 12 are released to the atmosphere, the thermal energy from the heating means 12 is not only in the oxygen pump element 7 but also in the atmosphere. It is also used for air heating. As a result, the thermal efficiency is deteriorated, the power consumption of the heating means 12 necessary for raising the temperature to the temperature at which the oxygen pump element 7 is operated increases, and the oxygen ions of the oxygen pump element are increased. It had the problem of poor transport efficiency. Further, in the embodiment, since the heating means 12 is disposed on the upper part of the oxygen pump element 7, the oxygen pump element 7 has a drawback that most of the radiant heat is used and the convection heat of the heated air cannot be used. . In this case as well, the timing of the voltage applied to the element is not specifically described, but in general, it is applied after the oxygen pump element is heated to a predetermined temperature.

  The present invention solves the above-described conventional problems, and by intentionally changing the voltage applied to the solid electrolyte, the time during which oxygen can be supplied, that is, the start-up property as an oxygen pump element is improved. It is an object of the present invention to provide an oxygen pump element capable of supplying oxygen in a short time and an oxygen supply device equipped with the element.

  In order to solve the conventional problem, an oxygen pump element of the present invention includes at least an oxygen ion conductive solid electrolyte, and electrode films constituting positive and negative electrodes formed on both surfaces of the oxygen ion conductive solid electrolyte. And a lead member led from the electrode film, and is configured to apply the set voltage A at the initial drive, then lower the applied voltage, and operate at the set voltage B during steady operation. .

  Accordingly, by applying a high voltage to the solid electrolyte at the initial stage, a low current flows through the solid electrolyte itself even at room temperature, and internal heat generation occurs. As a result, the temperature at which the solid electrolyte is steadily operated, for example, lanthanum gallate system, can be heated to 550 to 600 ° C. in a short time. As a result, oxygen can be supplied faster than applying a voltage to the solid electrolyte after a predetermined temperature is reached only by indirect heating as in the prior art.

  The oxygen pump element of the present invention can further shorten the rise time during which oxygen can be supplied.

  The first invention includes at least an oxygen ion conductive solid electrolyte, an electrode film constituting both positive and negative electrodes formed on both surfaces of the oxygen ion conductive solid electrolyte, and a lead member led from the electrode film. By providing a configuration in which a set voltage A is applied at the time of initial driving, and then the applied voltage is lowered, and the set voltage B is operated at the time of steady operation so that a high voltage is applied to the solid electrolyte at the initial stage. Even at room temperature, a low current flows through the solid electrolyte itself, causing internal heat generation. As a result, the temperature at which the solid electrolyte is steadily operated, for example, lanthanum gallate system, can be heated to 550 to 600 ° C. in a short time. As a result, oxygen can be supplied faster than applying a voltage after a predetermined temperature is reached only by indirect heating as in the prior art.

  In the second invention, the voltage value applied to the solid electrolyte is reduced to the set voltage B by sweeping while detecting the value of the current flowing through the solid electrolyte. Since the oxygen ion conduction characteristics abruptly occur from 0 ° C., the solid electrolyte can be activated without causing cracks or the like by sweeping the voltage while detecting the current value.

  In the third invention, in particular, with the oxygen pump element of the first or second invention, a metal foil member is bonded to the outer peripheral portion of the positive electrode, the negative electrode, or both the positive and negative electrode films. Since the thermal distortion such as tension that the foil member receives in the process of manufacturing the oxygen pump element can be alleviated, for example, even when the metal foil is as thin as 10 μm, the member can be finished in a warp-free state. When used as an oxygen pump element, a large current flows from the electrode film to the lead portion, but it is possible to cope with a large thermal stress generated at this time with the flexibility of the thin metal foil.

  In the fourth invention, in particular, with respect to the metal foil members of the first to third inventions, the metal foil member that is connected to the electrode film has a conductive layer formed at the joint portion and communicates with the conductive layer. Since the conductive film to be formed is formed with a predetermined width, the metal foil member can relieve thermal strain such as tension received in the manufacturing process of the oxygen pump element. For example, even when the metal foil is as thin as 10 μm, the member is warped. It can finish in the state without. Also, when used as an oxygen pump element, a large current flows from the electrode film to the conductive film, but the conductive film having a predetermined width protects against oxidative corrosion of the metal foil against the large amount of heat generated at this time. be able to. Moreover, since it is cheaper and has sufficient mechanical strength as compared with the conductive film, it is possible to maintain a degree of design freedom by improving the bending strength by devising the printing pattern.

  In the fifth invention, in particular, the oxygen pump element according to the first to fourth inventions has a configuration in which the set voltage A applied during initial driving is 100 V to 10 kV, so that a high resistance value is obtained near room temperature. A current of about several to several tens mA flows through the solid electrolyte, and as a result, self-heating can be caused inside the solid electrolyte, and the rise of the oxygen pump element can be accelerated.

  In the fifth invention, in particular, for the oxygen pump elements of the first to fifth inventions, the ratio of the set voltage A applied during initial driving to the set voltage B applied during steady operation is A / B of 100 or more. With this configuration, a current of about several to several tens of mA flows even for a solid electrolyte having a high resistance value near room temperature, and as a result, self-heating can be generated inside the solid electrolyte. Can rise faster.

  The seventh aspect of the invention is particularly excellent in resistance to high-temperature oxidation by using a ferritic stainless steel containing aluminum for the metal foil member of any one of the first to sixth aspects of the invention. Thus, stable characteristics can be maintained for long-term use around 800 ° C.

  The eighth invention is a perovskite type composite metal oxide mainly composed of lanthanum and gallium by using the solid electrolyte of any one of the first to seventh inventions as lanthanum gallate, It has 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 the ninth aspect of the invention, in particular, by setting the width of the conductive film of any one of the first to eighth aspects to 3 to 7 mm, a large current flows through the conductive film formed on the metal foil member, whereby the electrode Even when the vicinity of the junction with the membrane was locally heated, the oxidative corrosion could be prevented, and the long-term stability of the oxygen pump element could be improved.

  In particular, the tenth invention is the oxygen pump element according to any one of the first to ninth inventions, a voltage applying means for applying a voltage to the oxygen pump element, and a voltage control means for controlling the voltage applying means. Heating means for heating the oxygen pump element; temperature control means for detecting the temperature of the oxygen pump element to control the heating means; and air permeability for preventing thermal diffusion of the heating means and the oxygen pump element. A heat insulating means, and a mixing means that mixes oxygen generated through the oxygen pump element with air to form a mixed gas having a predetermined oxygen concentration, operates the heating means during initial driving, and sets a voltage to the oxygen pump element. After applying A, the applied voltage of the oxygen pump element is lowered, and at a steady operation, the oxygen pump element and the heating means are operated in the atmosphere by operating at the set voltage B. Since there is no direct contact thermal efficiency is improved to the oxygen pump element by the heating means, it is possible to reduce the power required to heat the oxygen pump element, it is possible to achieve energy saving. Moreover, the time during which oxygen can be supplied can be shortened by intentionally changing the voltage applied to the element. Moreover, since the whole oxygen pump element can be heated uniformly, the damage prevention effect of the oxygen pump element can be improved. Further, since the oxygen pump element, the partitioning means, and the heating means can be a simple structure covered with a heat insulating material having a ventilation function, the oxygen pump can be miniaturized and can be easily mounted on a device. it can.

  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)
FIG. 1 shows a cross-sectional configuration diagram of an oxygen pump element according to the first embodiment of the present invention, and FIG. 2 shows a schematic assembly configuration diagram of the oxygen pump element.

In FIG. 1, a solid electrolyte 16 is formed by molding a sintered body of substitutional type lanthanum gallate (La _0.8 Sr _0.2 Ga _0.8 Mg _0.2 O ₃ ) into a flat plate having an arbitrary thickness. The positive electrode film 17 and the negative electrode film 18 are coupled to the surface so as to express oxygen ion conductivity. Here, the solid electrolyte 16 will be described assuming a size of 30 × 30 mm and a thickness of 100 μm.

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. A positive and negative electrode film having a thickness of about 10 μm was 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 form 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.

  A conductive metal foil member 21 is connected to the negative electrode film 18 side. As the metal foil member 21, Fe-20Cr-5Al, 12 [mu] m is used, and an opening is provided so that the negative electrode film 18 side is exposed. Conductive films 22 and 23 are formed on both side surfaces of the inner periphery where the metal foil member 21 is connected to the solid electrolyte 18. For the conductive films 22 and 23, a printed film was formed by screen printing using AgPd paste, and after drying, the conductive film having a thickness of about 3 μm was formed with a width of 5 mm by baking at 800 ° C. The positive electrode film 17 side is also connected to a conductive metal foil member 24. Here, the same material as that on the negative electrode film 18 side is used, and an opening is provided so that the positive electrode film 17 side is exposed. Conductive films 25 and 26 are formed on both side surfaces of the inner periphery where the metal foil member 24 is connected to the solid electrolyte 16. The metal foil member 21 disposed on the negative electrode film 18 side is larger than the metal foil member 24 disposed on the positive electrode film 17 side, and is also used as a space partition means when oxygen is selectively transported by the solid electrolyte 16. It has come to be. The metal foil members 21 and 24 are bonded 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 27 and 28. The conductive layer 27 is made of Au paste, dried and baked at 800 ° C., so that the conductive layer having a film thickness of about 4 μm is formed to be electrically connected to the conductive films 25 and 26 of the metal foil member 24. Also, the conductive layer having a thickness of about 4 μm was formed so as to be electrically connected to the conductive films 22 and 23 of the metal foil member 21 by using Au paste and drying and baking at 800 ° C. Further, the lead member 29 is connected from the conductive film 22 side formed on the metal foil member 21, and the lead member 30 is connected from the conductive film 26 side formed on the metal foil member 24. The insulating member 31 prevents the metal foil member 24 from being short-circuited with the metal foil member 21. As the insulating member 31, a mica sheet having a thickness of 0.15 mm was used. Since the lead members 29 and 30 are arranged in the same direction with respect to the surface of the solid electrolyte 16, the structural layout configuration can be simplified in manufacturing the oxygen supply device.

  FIG. 3 is a schematic cross-sectional configuration diagram of an oxygen supply apparatus using the oxygen pump element.

  Around the metal foil member 21 serving as a space partitioning means for the solid electrolyte, it is fixed to a support 33 with an electrically insulating gas sealant 32.

  In addition, a voltage application unit 34 and a current value detection unit 35 are connected to the positive electrode film 17 side and the negative electrode film 18 side via a conductor, and a voltage control unit 36 is connected to the voltage application unit 34. ing.

  The heater 38 constituting the heating unit 37 is disposed opposite to the surface on the negative electrode 18 side, and a temperature control unit 39 having a unit 39 a for detecting the temperature of the solid electrolyte 16 sends a signal to the heating unit 37. .

  The means 39a 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 39, the temperature control means 39 controls the input of the heater 38 constituting the heating means 37.

  The heat insulating means 40 and 41 are breathable heat insulating members for suppressing the loss of heat generated by the heater 38. 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 device and the container 42 for maintaining the overall shape are provided with an opening 43 for ventilation on the negative electrode film 18 side.

  A gas mixing means 45 is connected to the positive electrode film 17 side of the container 42 through a vent 44. The mixing unit 45 includes a gas induction pipe 46, a mixed gas introduction pipe 47, a gas mixer 48, and a gas pump 49.

  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 40 and 41 which are breathable heat insulating materials constituting the oxygen pump device, and the positive electrode film 17. It is stable in a state of diffusing up to the surface on the side and the negative electrode film 18 side.

  In this state, when the heater 38 is energized by the temperature control means 39, the temperature of the solid electrolyte 16 in the heat insulation means 40 and 41 rises. Further, 100 V is applied between the positive electrode film 17 and the negative electrode film 18 of the solid electrolyte 16 by the voltage applying means 34. Then, a current of several tens mA flows inside the solid electrolyte. While the solid electrolyte is indirectly heated by the heater 38, the temperature rises due to self-heating from the current flowing inside the solid electrolyte, and the resistance value of the solid electrolyte gradually decreases, so that the flowing current value increases. Furthermore, since lanthanum gallate exhibits oxygen ion conduction characteristics abruptly from about 400 ° C., the current value increases abruptly. Since the current value flowing through the solid electrolyte is measured by the current value detection means 35, the voltage applied to the solid electrolyte 16 is controlled by the voltage control means 36 in response to a signal from the current value detection means 35.

  The temperature control means 38 is energized while controlling the heater 37 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.

  When the solid electrolyte 16 reaches a temperature at which oxygen ions can be conducted, the voltage applied to the solid electrolyte 16 is reduced to about 1V. At this time, the value of the current flowing through the solid electrolyte 16 reaches about 10A. Then, oxygen in the vicinity of the surface on the negative electrode film 18 side moves from the negative electrode film 18 to the positive electrode film 17 as oxygen ions in the solid electrolyte 16 by an electrochemical reaction, and oxygen from the surface on the positive electrode film 17 side. It will be released as a molecule. FIG. 4 shows a voltage-current characteristic diagram of the oxygen pump element.

  At this time, the solid electrolyte 16 self-heats when a low voltage and large current flows. Therefore, the metal foil member used is also exposed to a high temperature state in addition to the atmospheric temperature of 600 ° C. The conductive film formed on the surface of the metal foil member improved the current collecting ability against a large current and could effectively protect against the surface oxidation of the metal foil. In order to prevent the high-temperature oxidation by forming a conductive film on the surface of the metal foil member, it is necessary to have a width of 3 mm or more in the outer peripheral direction from at least the joint with the positive and negative electrode films. Moreover, since an expensive material is wasted even if the width is too large, it is considered that the width of the conductive film formed on the surface of the metal foil member is practically preferably 3 to 7 mm.

  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 32 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 41, and new oxygen is supplied from the outside to the negative electrode film 18 side.

  Oxygen gas released from the positive electrode film 17 passes through the vent 44 and constitutes a gas mixing means 45 to constitute a gas to be mixed by a gas induction pipe 46, a gas mixture introduction pipe 47, and a gas mixer 48. Mixed with. In this 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 49.

  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 invention is executed by voltage control by the voltage control means 36 and control of the mixed gas flow rate by the gas pump 49.

  As described above, in the present embodiment, by supplying a current to the heater for heating and applying a high voltage to both electrodes of the solid electrolyte, it is possible to supply oxygen for about 30 seconds as compared with the case of the heater alone. It was possible to shorten it.

  Further, the present oxygen supply device combines the solid electrolyte 16, the positive electrode film 17 side and the negative electrode film 18 side so as to exhibit oxygen ion conductivity, and gas is leaked by the partition means through the solid electrolyte 16. By suppressing the heating temperature and applying the voltage, oxygen molecules are released from the positive electrode film 17 to generate a mixed gas enriched with oxygen. The voltage control by the voltage control means 36 and the mixing by the gas pump 49 are performed. An arbitrary oxygen concentration gas can be stably obtained by controlling the gas flow rate.

(Embodiment 2)
FIG. 5 shows a cross-sectional configuration diagram of the oxygen pump element in the second embodiment of the present invention, and FIG. 6 shows a top configuration diagram of the oxygen pump element. Since the schematic configuration is the same as that of the first embodiment, only different parts will be described. The configurations of the electrode film and the conductive film formed on the surface of the solid electrolyte are the same. Here, three solid electrolytes are connected in series. The outer peripheries of the solid electrolytes 50, 51, 52 are joined to the metal foil member 53 with a conductive film and a conductive layer, and the positive electrode side of the solid electrolyte 50 is connected to the solid electrolyte 51 via the metal foil member 54. At this time, the metal foil member 53 has the insulating portion 55, and the positive electrode side of the solid electrolyte 50 is connected to the negative electrode side of the solid electrolyte 51. The positive electrode side of the solid electrolyte 51 is connected to the solid electrolyte 52 via a metal foil member 56. At this time, the metal foil member 53 has the insulating portion 57, and the positive electrode side of the solid electrolyte 51 is connected to the negative electrode side of the solid electrolyte 52. A metal foil member 58 is disposed on the positive electrode side of the solid electrolyte 52, and a lead member 59 is provided on the metal foil member 58. The metal foil member 53 is provided with a lead member 60.

  About 10 kV is applied to such an oxygen pump element. As a result, it becomes possible to pass a current of several tens of mA inside the solid electrolyte. As a result, internal heat generation was caused, and the time during which oxygen could be supplied could be shortened by 1 minute or more compared with the case where only the indirect heater was used.

  In this embodiment, lanthanum gallate is used as the solid electrolyte. However, the present invention is not limited to this, and yttrium-doped zirconia (YSZ), samarium-doped ceria (SDC), or the like may be used. However, at present, the lanthanum gallate material is the most preferable material in view of the durability of the material because the operating temperature is low as an oxygen ion conductor. It is also possible to intentionally lower the resistance value at a low temperature by adding an electron conductive component to a solid electrolyte excellent in oxygen ion conductivity.

  In the present embodiment, the Fe-20Cr-5Al material is used as the metal foil member. However, the present invention is not limited to this, and other metal foil materials may be used as long as the material has durability against high-temperature oxidation. 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 the high temperature oxidation resistance. Moreover, although 12 micrometers in thickness was used, it is thought that 5-30 micrometers is preferable as a metal foil member.

  Further, in the present embodiment, as a configuration of the metal foil member, only the case where the solid electrolyte is used as a partitioning means for partitioning the space portion by enlarging the side to be bonded to the negative electrode film side has been described. You may enlarge the direction joined to the film | membrane side.

  In this embodiment, Au-based or AgPd-based is used as the conductive film. However, the present invention is not limited to this, and other materials can be used as long as they have a low resistance and heat resistance.

  Moreover, although this Embodiment demonstrated the case where a electrically conductive film was further arrange | positioned to the positive / negative electrode film on the solid electrolyte surface, it can apply also to the structure which does not arrange | position a electrically conductive film.

  As described above, since the oxygen pump element and the oxygen supply device according to the present invention can obtain stable and good electric current characteristics over a long period of time, an air purifier, an air conditioner, or a health promoting device that uses oxygen, Applicable to a wide range of uses such as health promotion equipment.

Sectional block diagram of the oxygen pump element according to the first embodiment of the present invention 1 is a schematic assembly configuration diagram of an oxygen pump element according to a first embodiment of the present invention. 1 is a schematic cross-sectional configuration diagram of an oxygen supply device according to a first embodiment of the present invention. FIG. 3 is a voltage-current characteristic diagram of the oxygen pump element according to the first embodiment of the present invention. Sectional block diagram of the oxygen pump element in the 2nd Embodiment of this invention Top view configuration diagram of an oxygen pump element in the second embodiment of the present invention The figure which shows the oxygen pump element by the conventional patent document 1 reference The figure which shows the oxygen pump element apparatus by the conventional patent document 2 reference

Explanation of symbols

16 Solid Electrolyte 17 Positive Electrode Film 18 Negative Electrode Film 21 Metal Foil Member 22, 23 Conductive Film Layer 24 Metal Foil Member 25, 26 Conductive Film 27, 28 Conductive Film Layer 29, 30 Lead Member 34 Voltage Application Means 35 Current Value Detection Means 36 Voltage control means 38 Heating means 39 Temperature control means 40, 41 Heat insulation means 45 Mixing means

Claims (10)

At least an oxygen ion conductive solid electrolyte, an electrode film constituting both positive and negative electrodes formed on both sides of the oxygen ion conductive solid electrolyte, and a lead member led from the electrode film, and at the time of initial driving An oxygen pump element, wherein a set voltage A is applied, the applied voltage is then lowered, and the set voltage B is operated during steady operation. 2. The oxygen pump element according to claim 1, wherein a voltage value applied to the solid electrolyte is decreased to a set voltage B by sweeping while detecting a current value flowing through the solid electrolyte. The oxygen pump element according to claim 1, wherein a metal foil member is bonded to the outer peripheral portion of the positive electrode, the negative electrode, or both positive and negative electrode films. 4. The metal foil member having a connection structure with an electrode film, wherein a conductive layer is formed at a joint portion, and a conductive film communicating with the conductive layer is formed with a predetermined width. The oxygen pump element described in 1. The oxygen pump element according to any one of claims 1 to 4, wherein the set voltage A applied during initial driving is 100V to 10kV. The oxygen pump element according to any one of claims 1 to 5, wherein A / B, which is a ratio of a set voltage A applied during initial driving and a set voltage B applied during steady operation, is 100 or more. The oxygen pump element according to any one of claims 1 to 6, wherein the metal foil member is a ferritic stainless steel containing aluminum. The oxygen pump element according to claim 1, wherein the solid electrolyte is a lanthanum gallate system. The oxygen pump element according to any one of claims 1 to 8, wherein the conductive film has a width of 3 to 7 mm. The oxygen pump element according to any one of claims 1 to 9, voltage application means for applying a voltage to the oxygen pump element, voltage control means for controlling the voltage application means, and heating the oxygen pump element. Heating means, temperature control means for detecting the temperature of the oxygen pump element and controlling the heating means, breathable heat insulating means for preventing thermal diffusion of the heating means and the oxygen pump element, and the oxygen pump element Mixing means that mixes oxygen generated through air with air to form a mixed gas having a predetermined oxygen concentration, operates the heating means during initial driving, applies a set voltage A to the oxygen pump element, and then An oxygen supply device, wherein the applied voltage of the oxygen pump element is lowered and operated at a set voltage B.

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