JP2006218362A - Oxygen pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oxygen pump which is capable of conducting the efficient movement to uniformly heat an oxygen pump element and to reduce its thermal loss by forming a resistance heater or infrared reflection layer on a heat-resistant substrate. <P>SOLUTION: The oxygen pump is composed of an oxygen pump element 6 having positive and negative electrode membranes 5a and 5b formed on both sides of an oxygen ion conducting substrate 4, heating means 10a and 10b having the resistance heaters 12a and 12b, to which the infrared radiation layers 16a and 16b are laminated, are formed on the heat-resistant substrates 11a and 11b, a conducting means 8 which is electrically connected with the electrode membranes 5a and 5b and a gas permeable insulation materials 9a and 9b which electrically insulate the oxygen pump element 6 and the heating means 10a and 10b. The oxygen pump can heat the resistance heaters 12a and 12b to which the infrared radiation layers 16a and 16b are laminated and the oxygen pump element 6 uniformly and high efficiently by arranging the negative electrode membrane of the oxygen pump element 6 and the resistance heaters 12a and 12b of the heating means 10a and 10b to a relative structure. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an oxygen pump that moves oxygen ions electrochemically.

  Conventionally, this type of oxygen pump has a heating means using a resistance heating element such as a heating wire in order to maintain the temperature at a predetermined temperature required for operating the oxygen pump element (for example, Patent Document 1). reference).

FIG. 3 shows a conventional oxygen pump described in Patent Document 1. As shown in FIG. As shown in FIG. 3, the oxygen ion conductive substrate 1 is provided with a voltage applying means 2 and a temperature adjusting means 3 as a heating means.
Japanese Unexamined Patent Publication No. 7-172803

  However, the conventional configuration has problems that uniform heating is difficult on the oxygen ion conductive substrate, and that energy efficient heating is difficult to obtain such as a large heat loss and time required for temperature rise. It was.

  The present invention solves the above-described conventional problems, and an object thereof is to provide an oxygen pump that can perform uniform and high-efficiency heating and that further reduces heat loss.

  In order to solve the above-described conventional problems, an oxygen pump element in which positive and negative electrode films are formed on both surfaces of an oxygen ion conductive substrate, and a heating in which a resistance heating element in which an infrared radiation layer is laminated on a heat resistant substrate are formed. Means, electrically conductive means electrically connected to the electrode film, and a breathable insulating material that electrically insulates the oxygen pump element and the heating means, and the oxygen ion conductive substrate is formed by the heating means. Is an oxygen pump for heating.

  As a result, the oxygen ion conductive substrate can be heated uniformly and efficiently.

  Further, an oxygen pump element in which positive and negative electrode films are formed on both surfaces of an oxygen ion conductive substrate, a resistance heating element in which an infrared radiation layer is laminated on a heat resistant substrate, and a heating means formed by an infrared reflection layer, Oxygen having electrically conductive means electrically connected to the electrode film, and a breathable insulating material that electrically insulates the oxygen pump element and the heating means, and heats the oxygen ion conductive substrate by the heating means It is a pump.

  As a result, the oxygen ion conductive substrate can be heated uniformly and efficiently, and heat loss is reduced by the infrared reflective layer.

  In the oxygen pump of the present invention, the oxygen pump element can be heated uniformly and efficiently, and further, heat loss can be reduced, so that an oxygen pump element with low power consumption can be provided.

  The first invention includes an oxygen pump element in which positive and negative electrode films are formed on both surfaces of an oxygen ion conductive substrate, a heating unit in which a resistance heating element in which an infrared radiation layer is laminated on a heat resistant substrate, Conductive means electrically connected to the electrode film, and a breathable insulating material that electrically insulates the oxygen pump element and the heating means, and positive and negative electrode films of the oxygen pump element and resistance of the heating means By disposing the heating elements in the opposite configuration, the resistance heating element can uniformly heat the oxygen pump element, and the infrared radiation layer increases the amount of heat radiation from the resistance heating element, thereby enabling high-efficiency heating.

  According to the second invention, in particular, the resistance heating element is composed of at least one of platinum, gold, silver, palladium, and rhodium, so that a thin film type resistance heating element is configured as a rapid heating means. Can do.

  According to a third aspect of the present invention, in particular, the infrared radiation layer is made of a metal oxide and a heat-resistant binder, whereby a radiation layer having a high infrared radiation rate is obtained, and a heating means capable of highly efficient radiation heating is provided. Can do.

  According to the fourth aspect of the invention, in particular, the heat-resistant substrate is made of insulating ceramics, and it is possible to provide a heating means that has little thermal influence such as thermal deterioration.

  In the fifth aspect of the invention, in particular, a breathable insulating material with less thermal influence such as thermal deterioration can be obtained by using a porous molded body of an insulating oxide such as silica or alumina as the breathable insulating material.

  In particular, the sixth invention is a molded body made of an insulating oxide such as silica or alumina as the breathable insulating material, and has a structure having a through hole for ventilation in the molded body. A gas-permeable insulating material with a small amount can be obtained.

  The seventh invention particularly relates to an oxygen pump element in which positive and negative electrode films are formed on both surfaces of an oxygen ion conductive substrate, a heating means in which a resistance heating element and an infrared reflective layer are formed on a heat resistant substrate, and the electrode Conductive means electrically connected to the membrane, and a breathable insulating material that electrically insulates the oxygen pump element and the heating means, and the resistance heat generation of the positive and negative electrode films of the oxygen pump element and the heating means By disposing the bodies in opposition, the resistance heating element can heat the oxygen pump element uniformly and with high efficiency, and the infrared reflection layer enables efficient heating with little heat loss.

  In the eighth invention, in particular, the resistance heating element is composed of at least one of platinum, gold, silver, palladium, and rhodium, so that a thin film type resistance heating element is configured as a rapid heating means. Is possible.

  The ninth aspect of the present invention is a heating means capable of obtaining a radiation layer with a high infrared radiation rate and capable of high-efficiency radiation heating, in particular, by configuring the infrared radiation layer with a metal oxide and a heat-resistant binder. Can do.

  In the tenth aspect of the invention, in particular, the infrared reflective layer is made of at least one of platinum, gold, silver, palladium, and rhodium, thereby forming a thin-film infrared reflective layer and suppressing heat loss due to radiation. Is possible.

  In the eleventh aspect of the invention, in particular, the heat-resistant substrate is made of insulating ceramics, and it becomes possible to provide a heating means with little thermal influence such as thermal deterioration.

  In the twelfth aspect of the invention, in particular, a breathable insulating material with less thermal influence such as thermal deterioration can be obtained by using a porous molded body of an insulating oxide such as silica or alumina as the breathable insulating material.

  In the thirteenth invention, in particular, the breathable insulating material is a molded body of an insulating oxide such as silica or alumina, and the molded body has a structure having a through-hole for ventilation. A gas-permeable insulating material with a small amount can be obtained.

  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 is a schematic cross-sectional view of an oxygen pump according to the first embodiment of the present invention.

In FIG. 1, an oxygen ion conductive substrate 4 is made of a sintered body of substitutional type lanthanum gallate (La _0.8 Sr _0.2 Ga _0.8 Mg _0.2 O ₃ ) having an arbitrary thickness (for example, about 200 μm). ), The electrode films 5a and 5b are formed on both surfaces thereof, and the oxygen pump element 6 is formed.

  The oxygen pump element 6 is connected to the voltage applying means 8 through the conductive means 7. The oxygen pump element 6 is laminated with breathable insulating materials 9a and 9b and heating means 10a and 10b. The heating means 10a and 10b are composed of heat resistant substrates 11a and 11b and resistance heating elements 12a and 12b. The resistance heating elements 12a and 12b are connected to the heating voltage applying means 14a and 14b via the conductive means 13a and 13b.

  Infrared radiation layers 16a and 16b are laminated on the surfaces of the resistance heating elements 12a and 12b, respectively.

  The oxygen ion conductive substrate 4 is not limited to lanthanum gallate, and may be yttrium-doped zirconia (YSZ), samarium-doped ceria (SDC), or the like.

A perovskite complex oxide having conductivity was used for the electrode film. For example, a paste obtained by mixing Sm _0.5 Sr _0.5 CoO ₃ with a cellulosic vehicle that is an organic solvent was used to form a printed film by screen printing, followed by drying and baking to form a porous electrode film.

  Furthermore, the electrode films 5a and 5b have a two-layer structure in which a porous film made of metal such as gold or platinum having high conductivity is formed on the surface of a porous electrode film using a perovskite complex oxide. Also good. The forming method may be printing as described above.

  The conductive means 7 may be a metal wire such as Au, Pt, or Ni. The breathable insulating materials 9a and 9b are porous molded bodies of insulating oxides such as silica and alumina, or a molded body of insulating oxides such as silica and alumina (not shown) provided with through holes for ventilation. It's okay. Since the oxygen pump element 6 moves oxygen from the negative electrode film side to the positive electrode film side, the air permeable insulating material needs to have sufficient air permeability, but is not limited to either one. What meets the characteristics required for the oxygen pump may be selected.

  The heat-resistant substrates 11a and 11b are made of insulating ceramics such as alumina and cordierite that have a small thermal influence such as heat deterioration that can be molded. In order to suppress the heat loss of the resistance heating elements 12a and 12b, it is preferable that the resistance heating elements 12a and 12b be as thin as possible as long as the mechanical strength is ensured.

  The resistance heating elements 12a and 12b are made of at least one of platinum, gold, silver, palladium, and rhodium. A thin film heating element can be formed on the surface of the heat-resistant substrate 11 by the same printing method as that for the electrode films 5a and 5b. In the case of the printing method, the thickness of the resistance heating elements 12a and 12b can be about several μm, so that the rapid heating means 10a and 10b can be obtained.

  The infrared radiation layers 16a and 16b are films obtained by any film forming means such as post-coating heat sintering using a precursor of the radiation layer. The coating is obtained, for example, by heat-sintering a borosiloxane polymer as a heat-resistant binder, a composite oxide of iron, manganese and copper as metal oxides, and a precursor mixed with zirconia, alumina and a solvent. It is done.

  The infrared radiation layers 16a and 16b thus obtained can be formed to have an arbitrary thickness, and a high infrared radiation rate can be obtained. For example, according to the heat balance type emissometer with the above composition, the thickness is about 5 μm and the emissivity is about 0.8. The emissivity of the resistance heating elements 12a and 12b is about 0.1 to 0.3 depending on the surface state, and the infrared radiation layers 16a and 16b are clearly suitable for radiant heating.

  The oxygen pump element 6 and the heating means 10a and 10b are respectively connected to the electrode films 5a and 5b of the oxygen pump element 6 and the resistance heating elements 12a and 12b of the heating means 10a and 10b via the air-permeable insulating materials 9a and 9b. And place it. That is, the resistance heating elements 12a and 12b formed on the heat resistant substrates 11a and 11b are electrodes provided on the oxygen ion conductive substrate 4 provided with a space between the heat resistant substrates 11a and 11b. It is provided opposite to the films 5a and 5b.

  At this time, the spatial distance between the oxygen pump element 6 and the heating means 10a and 10b is preferably as short as possible because the radiation intensity of the resistance heating elements 12a and 12b is inversely proportional to the square of the distance.

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

  The resistance heating elements 12a and 12b rise in temperature by energization from the heating voltage applying means 14a and 14b, and directly radiately heat the oxygen pump element 6 in which the infrared radiation layers 16a and 16b are arranged in the vicinity of the space. . Since the spatial distance between the resistance heating elements 12a and 12b and the oxygen pump element 6 is short, the oxygen pump raises the temperature to a predetermined temperature in a short time.

  When the oxygen pump element 6 heated to a predetermined temperature by radiant heating is energized between the positive and negative electrodes by the voltage applying means 8, oxygen movement proceeds from the negative electrode side toward the positive electrode side. At this time, oxygen is supplied from the surrounding atmosphere through the breathable insulating material 9a. As a result, only oxygen is transported to the surface of the positive electrode film 5b.

  As described above, in the present embodiment, the resistance heating elements 12a and 12b in which the infrared radiation layers 16a and 16b are laminated and the oxygen pump element 6 are opposed to each other in substantially the same form. Uniform and highly efficient radiation heating is possible as compared with heating wire heating in which unevenness is likely to occur. Thereby, the efficient operation of the oxygen pump becomes possible.

(Embodiment 2)
FIG. 2 is a schematic cross-sectional view of an oxygen pump according to the second embodiment of the present invention.

In FIG. 2, the oxygen ion conductive substrate 4 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 (for example, about 200 μm). ), The electrode films 5a and 5b are formed on both surfaces thereof, and the oxygen pump element 6 is formed.

  The oxygen pump element 6 is connected to the voltage applying means 8 through the conductive means 7. The oxygen pump element 6 is laminated with breathable insulating materials 9a and 9b and heating means 10a and 10b. The heating means 10a and 10b are composed of heat resistant substrates 11a and 11b, resistance heating elements 12a and 12b, and infrared reflecting layers 15a and 15b. The resistance heating elements 12a and 12b are connected to the heating voltage applying means 14a and 14b via the conductive means 13a and 13b.

  Hereinafter, the same configuration as that of the first embodiment will not be described.

  The infrared reflecting layers 15a and 15b are composed of at least one of platinum, gold, silver, palladium, and rhodium. The thin-film infrared reflecting layers 15a and 15b can be formed on the surfaces of the heat resistant substrates 11a and 11b by the same printing method as the electrode films 5a and 5b.

  In the case of a printing method, the thickness of the infrared reflecting layers 15a and 15b can be about several μm. In addition to the printing method, thin film forming means such as vapor deposition is also applicable.

  The infrared reflective layers 15a and 15b are required to have higher infrared reflectance than the heat resistant substrates 11a and 11b. In other words, the infrared radiation rate needs to be low. Thereby, the heat loss by the radiation from the heating means 10a and 10b can be suppressed. As the material, gold is most preferable among the above.

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

  The resistance heating elements 12a and 12b rise in temperature by energization from the heating voltage applying means 14a and 14b, and directly radiately heat the oxygen pump element 6 in which the infrared radiation layers 16a and 16b are arranged in the vicinity of the space. . Since the spatial distance between the resistance heating elements 12a and 12b and the oxygen pump element 6 is short, the oxygen pump raises the temperature to a predetermined temperature in a short time.

  At this time, the infrared reflecting layers 15a and 15b arranged on the opposite side of the resistance heating elements 12a and 12b have low infrared emissivity, so that the heat resistant substrates 11a and 11b heated by the heating of the resistance heating elements 12a and 12b Heat loss due to heat radiation is suppressed, and the oxygen pump element 6 is effectively heated.

  When the oxygen pump element 6 heated to a predetermined temperature by radiant heating is energized between the positive and negative electrodes by the voltage applying means 8, oxygen movement proceeds from the negative electrode side toward the positive electrode side. At this time, oxygen is supplied from the surrounding atmosphere through the breathable insulating material 9a. As a result, only oxygen is transported to the surface of the positive electrode film 5b.

  As described above, in the present embodiment, since the infrared reflection layers 15a and 15b suppress heat loss, it is possible to perform a thermal efficient operation of the oxygen pump.

  As described above, by providing oxygen pump elements with low power consumption that can achieve uniform and high-efficiency heating of oxygen pump elements and reduce heat loss, air cleaners and air conditioners that use oxygen or health Applicable to a wide range of applications such as promotion equipment and health promotion equipment.

Schematic sectional view of an oxygen pump in the first embodiment of the present invention Schematic sectional view of an oxygen pump in the first embodiment of the present invention Diagram showing a conventional oxygen pump

Explanation of symbols

4 Oxygen ion conductive substrate 5a, 5b Electrode film 6 Oxygen pump element 7 Conductive means 9a, 9b Breathable insulating material 10a, 10b Heating means 11a, 11b Heat resistant substrate 12a, 12b Resistance heating element 15a, 15b Infrared reflective layer 16a, 16b Infrared radiation layer

Claims (13)

An oxygen pump element having positive and negative electrode films formed on both surfaces of an oxygen ion conductive substrate; a heating means formed of a resistance heating element in which an infrared radiation layer is laminated on a heat resistant substrate; and the electrode film electrically An oxygen pump having connected conductive means, a breathable insulating material that electrically insulates the oxygen pump element and the heating means, and heats the oxygen ion conductive substrate by the heating means. The oxygen pump according to claim 1, wherein the resistance heating element is composed of at least one of platinum, gold, silver, palladium, and rhodium. The oxygen pump according to claim 1 or 2, wherein the infrared radiation layer is composed of a metal oxide and a heat-resistant binder. The oxygen pump according to any one of claims 1 to 3, wherein the heat-resistant substrate is made of an insulating ceramic. The oxygen pump according to any one of claims 1 to 4, wherein the breathable insulating material is a porous molded body of an insulating oxide such as silica or alumina. The oxygen pump according to any one of claims 1 to 4, wherein the breathable insulating material is a molded body of an insulating oxide such as silica or alumina, and the molded body has a through hole for ventilation. An oxygen pump element in which positive and negative electrode films are formed on both surfaces of an oxygen ion conductive substrate, a heating element formed by a resistance heating element in which an infrared radiation layer is laminated on a heat resistant substrate, and an infrared reflection layer, and the electrode film And an oxygen pump that heats the oxygen ion conductive substrate by the heating means. The oxygen pump includes: a conductive means electrically connected to the heat pump; and a breathable insulating material that electrically insulates the oxygen pump element and the heating means. The oxygen pump according to claim 7, wherein the resistance heating element is made of at least one of platinum, gold, silver, palladium, and rhodium. The oxygen pump according to claim 7 or 8, wherein the infrared radiation layer is composed of a metal oxide and a heat-resistant binder. The oxygen pump according to any one of claims 7 to 9, wherein the infrared reflection layer is composed of at least one of platinum, gold, silver, palladium, and rhodium. The oxygen pump according to any one of claims 7 to 10, wherein the heat-resistant substrate is made of an insulating ceramic. The oxygen pump according to any one of claims 7 to 11, wherein the breathable insulating material is a porous molded body of an insulating oxide such as silica or alumina. The oxygen pump according to any one of claims 7 to 11, wherein the breathable insulating material is a molded body of an insulating oxide such as silica or alumina, and the molded body has a through hole for ventilation.

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