JP2017116275A - Solid electrolyte sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid electrolyte sensor in which the possibility of causing a trouble in measurement of a potential difference due to electrode separation is reduced.SOLUTION: A solid electrolyte sensor 1 comprises: a cylindrical probe body 20; a sensor element 10 constituting at least the bottom of a bottomed cylindrical member 30 formed by blocking the probe body on one end side; an inside electrode 12 provided on the surface of the sensor element in the inside of the bottom; an outside electrode 11 for detecting an electromotive force occurring in the sensor element between the inside electrode and itself; a long bar-like member 40 inserted into the inside of the bottomed cylindrical member; and an urging member for urging the long bar-like member toward the bottom of the bottomed cylindrical member. The urging member is constituted from a flange part 45 projecting in the long bar-like member, a fixed plate 70 fixed to the probe body while the long bar-like member is inserted therethrough, and an elastic member (compression coil spring 50) disposed between the flange part and the fixed plate.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a solid electrolyte sensor for measuring a gas concentration using a solid electrolyte as a sensor element.

  Various solid electrolyte sensors for measuring gas concentrations of hydrogen gas, oxygen gas, carbon dioxide gas, water vapor and the like using a solid electrolyte as a sensor element have been proposed, and the present applicant has also made a plurality of proposals in the past (for example, Patent Literatures 1 to 3). The solid electrolyte sensor uses the principle of a concentration cell that generates a potential difference due to the concentration difference of the same ions. When the gas concentration of the object to be measured is different in the two spaces sandwiching the solid electrolyte, the electromotive force generated in the solid electrolyte Measure. If the gas concentration in one space is known, the gas concentration in the other space can be known from the measured electromotive force and the temperature of the measurement environment by the Nernst equation.

  Therefore, in the solid electrolyte sensor, it is necessary that the two spaces are partitioned by the solid electrolyte. In the above-described prior art, the bottomed cylindrical body is formed by closing one end of the cylindrical member with the sensor element of the solid electrolyte. Alternatively, the two spaces are partitioned by making the sensor element itself a bottomed cylindrical body. Then, electrodes are provided on the solid electrolyte inside and outside the bottomed cylindrical body, and the potential difference between the electrodes is measured. The electrode is generally a thin film of a metal such as platinum, gold, nickel, and palladium, and is formed, for example, by applying a metal paste to a solid electrolyte and then performing a heat treatment. Alternatively, a film-like electrode is formed by electrolytic plating, PVD method, or CVD method.

  However, the film-like electrode formed as described above has a drawback that it is easily peeled off. In particular, when the electrode (inner electrode) on the inner side of the bottomed cylindrical body is peeled off, there is a problem that it is difficult to perform repair or re-formation. If the electrode peels off from the solid electrolyte, the potential difference cannot be measured. If the electrode is peeled off from the solid electrolyte, the potential difference cannot be stably measured due to poor contact.

JP 10-318974 A JP 2011-174832 A JP-A-8-220063

  Therefore, in view of the above circumstances, an object of the present invention is to provide a solid electrolyte sensor in which the possibility of causing a problem in measuring a potential difference due to electrode peeling is reduced.

In order to solve the above problems, a solid electrolyte sensor according to the present invention is:
“A solid electrolyte sensor using a solid electrolyte as a sensor element,
A cylindrical probe body;
A sensor element constituting at least the bottom of the bottomed cylindrical body formed by closing the probe body on one end side;
An inner electrode provided on the surface of the sensor element inside the bottom and an outer electrode for detecting an electromotive force generated in the sensor element between the inner electrode;
A long rod-shaped member inserted into the bottomed cylindrical body;
And a biasing member that biases the long bar-shaped member toward the bottom portion ”.

  As an aspect in which the sensor element “configures at least the bottom of the bottomed cylindrical body formed by closing the probe body on one end side”, the sensor element directly closes one end side of the probe body. A mode in which a part of a member closing the probe main body on one end side is constituted by a sensor element, the sensor element is held so as to close one end of a cylindrical holder, and the holder An example in which the space between the inner peripheral surface of the probe main body and the outer peripheral surface of the holder is sealed while being inserted into the probe main body can be exemplified. In addition, as a shape of a sensor element, flat shape, a column shape, and a bottomed cylinder shape can be illustrated, and the opening of the sensor element in the case of a bottomed cylinder shape is toward the space inside the bottomed cylindrical body. Even if it opens, it may open toward the outer space.

  The “long bar-like member” can be a solid or hollow member. In addition, the “long bar-like member” may be constituted by a single member or may be constituted by connecting a plurality of members.

  In this configuration, the long bar member is pressed toward the bottom of the bottomed tubular body by the biasing member. And the inner side electrode is provided inside the bottom part of a bottomed cylindrical body. Therefore, the end on the bottom side of the long bar-like member (hereinafter sometimes referred to as “the tip of the long bar-like member”) is always in pressure contact with the inner electrode. Thereby, since the inner electrode is in a state of being constantly pushed toward the sensor element by the long bar-like member, peeling of the inner electrode is suppressed. Even if a part of the inner electrode is peeled off, the inner electrode is kept in contact with the sensor element because it is pressed against the sensor element by the tip of the long bar-shaped member.

  The solid electrolyte sensor according to the present invention may be configured so that “the long bar-shaped member supports at least one of a thermocouple and a lead wire” in the above configuration.

  In this configuration, the configuration that supports a member necessary for measurement by the solid electrolyte sensor also serves as a member that presses the inner electrode toward the sensor element. Therefore, it is possible to realize an effect of the purpose of reducing the possibility of causing a problem in the measurement of the potential difference due to electrode peeling with a simple and lean configuration.

  In addition, when the electrode is film-like, it is difficult to fix the lead wire to the electrode. On the other hand, in the present configuration in which the lead wire is supported by the long bar-like member, the lead wire can be pressed against the inner electrode by the long bar-like member without fixing the lead wire to the inner electrode.

  The solid electrolyte sensor according to the present invention may be configured such that “the long bar-shaped member is a heater” in the above configuration.

  In this configuration, the member that presses the inner electrode toward the sensor element also serves as a heater that heats the sensor element. By providing the heater, it is possible to control the temperature of the sensor element to be constant. As described above, detection of gas concentration using a solid electrolyte as a sensor element has temperature dependence, and therefore cannot be accurately detected if the temperature of the sensor element varies. Therefore, in this configuration, the gas concentration can be detected more accurately by a simple and lean configuration in which a long bar-shaped member provided for the purpose of reducing the possibility of potential failure in measuring the potential difference due to electrode peeling is used as a heater. The further effect of being able to be obtained can be obtained.

  As described above, as an effect of the present invention, it is possible to provide a solid electrolyte sensor in which the possibility of causing a problem in measuring the potential difference due to electrode peeling is reduced.

It is sectional drawing of the solid electrolyte sensor of 1st embodiment of this invention. It is an exploded view which shows the structure of the principal part of the solid electrolyte sensor of FIG. It is sectional drawing of the probe main body of the solid electrolyte sensor of FIG. It is a perspective view of the solid electrolyte sensor of FIG. It is sectional drawing of the solid electrolyte sensor of 2nd embodiment of this invention. It is an exploded view which shows the structure of the principal part of the solid electrolyte sensor of FIG. It is an exploded view which shows the structure of the principal part of the solid electrolyte sensor of 3rd embodiment of this invention. It is an exploded view which shows the structure of the principal part of the solid electrolyte sensor of 4th embodiment of this invention. It is sectional drawing of the solid electrolyte sensor of other embodiment of this invention.

  Hereinafter, the solid electrolyte sensors 1 to 4 according to the first embodiment to the fourth embodiment of the present invention will be described. Here, the case where this invention is applied to the solid electrolyte sensor which measures the gas concentration in a gaseous phase is illustrated.

  Each of the solid electrolyte sensors 1 to 4 is a solid electrolyte sensor having a solid electrolyte as a sensor element 10, and is formed by closing the cylindrical probe main body 20 and the probe main body 20 at one end side. Between the sensor element 10 constituting at least the bottom of the bottom cylindrical body 30, the inner electrode 12 provided on the surface of the sensor element 10 inside the bottom of the bottomed cylindrical body 30, and the inner electrode 12 The outer electrode 11 for detecting the electromotive force generated in the sensor element 10, the long rod-shaped member inserted into the bottomed cylindrical body 30, and the long rod-shaped member toward the bottom of the bottomed cylindrical body 30. And an urging member that is urged. The urging member includes a flange portion protruding outward in the long rod-shaped member, a fixed plate fixed to the probe main body 20 in a state where the long rod-shaped member is inserted, and a gap between the flange portion and the fixed plate. It is comprised from the elastic body interposed in the state compressed or extended.

  First, the solid electrolyte sensor 1 according to the first embodiment will be described with reference to FIGS. 1 to 4. In the solid electrolyte sensor 1, the urging member includes a flange portion 45 projecting outward from the long bar-shaped member 40, a fixing plate 70 fixed to the probe main body 20 with the long bar-shaped member 40 inserted, and a flange. It is comprised from the elastic body interposed between the part 45 and the fixed plate 70. FIG. In the solid electrolyte sensor 1, the elastic body is the compression coil spring 50. The fixing plate 70 is located on the upper end side of the long bar-shaped member 40 with respect to the flange portion 45, and fixes the long bar-shaped member 40 to the probe main body 20 while compressing the compression coil spring 50.

  More specifically, the cylindrical probe body 20 includes a cylindrical main tube portion 21 having a single diameter, a bowl-shaped expanded tube portion 22 provided at one end of the main tube portion 21, and a main tube portion. 21 is provided with a reduced diameter cylindrical portion 24 that is connected to the other end of the main body 21 via a cylindrical connection portion 23 and has a smaller diameter than the main cylindrical portion 21. In the present embodiment, among the expanded cylindrical portion 22, the main cylindrical portion 21, the cylindrical connecting portion 23, and the reduced diameter cylindrical portion 24, at least the expanded cylindrical portion 22 and the main cylindrical portion 21 are made of conductive metal. It is. An opening edge portion 26 is formed along the opening of the main tube portion 21 at the boundary between the expanded tube portion 22 and the main tube portion 21, and a plurality of screw holes 27 are formed in the opening edge portion 26. Has been.

  Further, the expanded cylinder portion 22 has a gas introduction port 28 for introducing a reference gas or a measurement gas, and a wiring hole portion 29 for fitting a terminal block 91 provided with a plurality of wiring terminals. Is provided.

  The sensor element 10 has a bottomed cylindrical shape, and is attached to the inside of the reduced diameter cylindrical portion 24 so that the opening is opened on the inner side of the probe main body 20. The space between the outer peripheral surface of the element 10 is hermetically sealed by a seal member 95. That is, the bottomed cylindrical body 30 is formed by the probe main body 20, the sensor element 10 that closes the reduced diameter cylindrical portion 24 on one end side of the probe main body 20, and the seal member 95. And in the sensor element 10 which is the bottom part of the bottomed cylindrical body 30, the inner side electrode 12 is provided inside the bottom part of the bottomed cylindrical shape.

  On the other hand, the outer electrode 11 is provided outside the bottom of the sensor element 10. The lead wire 61 a having one end connected to the outer electrode 11 passes through the inside of the reduced diameter cylindrical portion 24 and the cylindrical connecting portion 23 and is connected to the conductive main cylindrical portion 21. Further, a lead wire 61b that is electrically connected to the lead wire 61a via the main tube portion 21 extends from the end portion of the main tube portion 21 on the side of the expanded tube portion 22, and the lead wire 61b is a terminal. The terminal 91 is connected to one of the terminals.

  The long bar-shaped member 40 of the present embodiment is an elongated cylindrical member having a plurality of holes that penetrate from one end to the other end, and is formed of an electrically insulating material such as alumina. The long rod-like member 40 is inserted into the bottomed cylindrical body 30, the tip thereof reaches the sensor element 10, and the other end exceeds the boundary between the expanded cylinder portion 22 and the main cylinder portion 21. It extends to the inside of the expanded cylinder portion 22.

  Two metal wires constituting the thermocouple 60 are respectively inserted into two of the plurality of holes of the long rod-shaped member 40, and the hot contact portion of the thermocouple 60 extends from the tip of the long rod-shaped member 40. It protrudes. Further, the other ends of the two metal wires constituting the thermocouple 60 are respectively drawn out from the end of the long rod-shaped member 40 on the side of the expanded cylindrical portion 22 and connected to two terminals of the terminal block 91, respectively. Yes.

  A lead wire 62 is inserted into the other one of the hole portions of the long rod-shaped member 40, and one end of the lead wire 62 is fixed to the long rod-shaped member 40 so as to protrude from the tip of the long rod-shaped member 40. The end is pulled out from the end of the long rod-shaped member 40 on the side of the expanded cylindrical portion 22 and connected to one of the terminals of the terminal block 91.

  The flange portion 45 is composed of an annular member through which the long rod-shaped member 40 is inserted, and is fixed to the long rod-shaped member 40 at a position lower than the boundary between the expanded cylindrical portion 22 and the main cylindrical portion 21. The flange portion 45 may be configured integrally with the long bar member 40.

  The fixed plate 70 has a substantially rectangular flat plate shape, and is provided with a through-hole portion 71 through which the long bar member 40 can pass. The fixing plate 70 has a retaining screw hole 72 penetrating at a position that coincides with the screw hole 27 when the fixing plate 70 is bridged over the opening edge 26 of the probe body 20. A compression coil spring 50 is inserted into the long rod-shaped member 40 on the side of the expanded cylinder portion 22 from the flange portion 45. The outer diameter of the compression coil spring 50 is such a size that it cannot pass through the flange portion 45.

  Further, a fixing plate 70 is inserted through the long rod-shaped member 40 through the through-hole portion 71 on the side of the expanded cylindrical portion 22 from the compression coil spring 50. The inner diameter of the through hole 71 is set smaller than the outer diameter of the compression coil spring 50. Then, in a state where the compression coil spring 50 is compressed, the fastening plate 99 inserted into the fastening screw hole 72 is fastened to the screw hole 27, whereby the fixing plate 70 is fixed to the probe body 20.

  In this configuration, the flange plate 45 is urged toward the bottom of the bottomed cylindrical body 30 by the compression coil spring 50 by fixing the fixing plate 70 to the probe body 20 while compressing the compression coil spring 50. Accordingly, the long bar-shaped member 40 with the flange portion 45 integrated is pressed against the bottom of the bottomed tubular body 30. As a result, the inner electrode 12 is always pressed against the sensor element 10 by the thermocouple 60 and the lead wire 62 protruding from the tip of the long bar-shaped member 40. Thereby, it is suppressed that the inner side electrode 12 peels from the surface of the sensor element 10. FIG. Even if a part of the inner electrode 12 is peeled off from the surface of the sensor element 10, the thermocouple 60 and the lead wire 62 protruding from the tip of the long bar-shaped member 40 press the inner electrode 12 against the sensor element 10. Therefore, the contact between the inner electrode 12 and the sensor element 10 is maintained.

  Further, even if the members constituting the solid electrolyte sensor 1 are thermally expanded and contracted due to the temperature fluctuation of the measurement environment, the thermocouple 60 protruding from the tip of the long bar-shaped member 40 is expanded and contracted by the compression coil spring 50. And the state where the lead wire 62 presses the inner electrode 12 against the sensor element 10 is maintained.

  In particular, in this embodiment, the long bar-like member 40 supports the thermocouple 60 and the lead wire 62 connected to the inner electrode 12, which are members necessary for measurement by the solid electrolyte sensor. Therefore, the effect of the purpose of reducing the possibility of causing a problem in the measurement of the potential difference due to the peeling of the electrode is realized by a simple and lean configuration.

  In addition, since the long bar-shaped member 40 is pressed against the bottom of the bottomed cylindrical body 30, the lead wire supported by the long bar-shaped member 40 does not need to be fixed to the inner electrode 12. The end of 62 is press-contacted to the inner electrode 12, and it is not necessary to fix the thermal contact of the thermocouple 60 to the sensor element 10. The element 10 is in pressure contact.

  In the solid electrolyte sensor of the present configuration, one of the reference gas or the measurement gas is introduced into the inner space of the bottomed cylindrical body 30 through the tube 92 connected to the gas introduction port 28 and brought into contact with the inner electrode 12. The other of the reference gas or the measurement gas is brought into contact with the outer electrode 11. The electromotive force generated in the sensor element 10 is measured via the lead wires 61a and 61b connected to the outer electrode and the lead wire 62 connected to the inner electrode, and the temperature of the sensor element 10 is adjusted by the thermocouple 60. By measuring, the concentration of the measurement target gas in the measurement gas can be detected.

  Next, the solid electrolyte sensor 2 of 2nd embodiment is demonstrated using FIG.5 and FIG.6. Here, in the solid electrolyte sensor 2, the same components as those of the solid electrolyte sensor 1 are denoted by the same reference numerals, and detailed description thereof is omitted. The solid electrolyte sensor 2 of the second embodiment is also a compression coil spring 50 as in the solid electrolyte sensor 1 of the first embodiment. The difference is the configuration of the long bar-like member 40b and the flange portion. The long bar-shaped member 40b of the second embodiment is the same as the long bar-shaped member 40 of the first embodiment in that the thermocouple 60 and the lead wire 62 are supported. Whereas it is composed of a single member, the long bar-like member 40b of the second embodiment is composed of a plurality of members.

  Specifically, the long rod-shaped member 40b is formed by connecting a tubular member 41 formed of a conductive material and a tubular member 42 formed of an electrically insulating material such as alumina having a larger diameter than the tubular member 42 and having a tubular shape. It is connected by the metal fitting 43, and the connection metal fitting 43 constitutes a flange portion. The long rod-shaped member 40b is inserted into the bottomed tubular body 30 such that the tubular member 41 is on the distal end side of the long rod-shaped member 40b. The thermal contact portion of the thermocouple 60 and one end of the lead wire 62 are respectively fixed to the tubular member 41 with an electrically insulating coating such as a glass tube and the tip protruding from the tip of the long rod-shaped member 40b. ing. The other end of the metal wire constituting the thermocouple 60 and the other end of the lead wire 62 are connected to the terminal of the terminal block 91 as in the first embodiment.

  In the second embodiment, an annular insulating ring 80 formed of an electrically insulating material such as alumina is interposed between the compression coil spring 50 and the connection fitting 43. The hole of the insulating ring 80 has a diameter larger than that of the tubular member 42 and a size that does not pass through the connection fitting 43. The urging member of the solid electrolyte sensor 2 is a fixed plate that is fixed to the probe main body 20 in a state in which the coupling member 43 as a flange portion protruding outward in the long rod-shaped member and the long rod-shaped member 40b are inserted. 70, and a compression coil spring 50 as an elastic body interposed between the connection fitting 43 and the fixed plate 70. The fixing plate 70 is located on the upper end side of the long bar-like member 40b with respect to the connection fitting 43 serving as the flange portion, and is fixed to the probe main body 20 while compressing the compression coil spring 50, as in the first embodiment. . Since the fixing plate 70 is fixed to the probe main body 20 while compressing the compression coil spring 50, the connection fitting 43 is urged toward the bottom of the bottomed cylindrical body 30 by the compression coil spring 50 via the insulating ring 80. Accordingly, the long bar-shaped member 40b in which the connection fitting 43 is integrated is pressed against the bottom of the bottomed cylindrical body 30.

  In addition, even if the fixing plate 70 and the compression coil spring 50 are made of a conductive material such as metal, the probe main body 20 electrically connected to the outer electrode 11 and the inner electrode are provided by including the insulating ring 80. 12 is prevented from being short-circuited via the tubular member 41, the coupling fitting 43, the compression coil spring 50, and the fixed plate 70.

  Also in the solid electrolyte sensor 2 having such a configuration, like the solid electrolyte sensor 1, the long bar-like member 40 b that suppresses the peeling of the inner electrode 12 and maintains good contact between the inner electrode 12 and the sensor element 10. However, it also serves as a member for supporting the thermocouple 60 and the lead wire 62 which are members necessary for measurement by the solid electrolyte sensor 2.

  5 and 6 exemplify a mode in which the lead wire 62 is inserted into the tubular member 41, the lead wire 62 may be arranged so as to be wound around the outer peripheral surface of the tubular member 41. . In that case, in order to prevent a short circuit between the lead wire 61a and the lead wire 62, the lead wire 61a is covered with an electrically insulating material.

  Next, the solid electrolyte sensor of the third embodiment will be described. In the third embodiment, the compression coil spring 50 of the first embodiment or the second embodiment is replaced with an elastic cylindrical body 50b formed in a cylindrical shape with an elastic material such as sponge or rubber. FIG. 7 illustrates a main configuration when the compression coil spring 50 is replaced with the elastic cylindrical body 50b in the solid electrolyte sensor 1 of the first embodiment.

  That is, the biasing member of the third embodiment includes a flange portion 45 projecting outward in the long rod-shaped member 40, a fixing plate 70 fixed to the probe main body 20 in a state where the long rod-shaped member 40 is inserted, It is comprised from the elastic body interposed between the flange part 45 and the fixed plate 70, and an elastic body is the elastic cylindrical body 50b. The fixing plate 70 is located on the upper end side of the long bar-shaped member 40 with respect to the flange portion 45, and is fixed to the probe body 20 while compressing the elastic cylindrical body 50b.

  Even with such a configuration, since the fixing plate 70 is fixed to the probe main body 20 while compressing the elastic cylindrical body 50b, the long bar-shaped member 40 is pressed toward the sensor element 10, so that the first The same effects as those of the first embodiment and the second embodiment can be obtained. In addition, when employ | adopting the same structure as the long rod-shaped member 40b of 2nd embodiment as a long rod-shaped member of 3rd embodiment, if the elastic cylinder 50b is an electrical insulator, the insulating ring 80 is unnecessary.

  Next, the solid electrolyte sensor of the fourth embodiment will be described with reference to FIG. The biasing member of the fourth embodiment includes a flange portion 45c protruding outward in the long rod-shaped member 40, a fixing plate 70c fixed to the probe main body 20 in a state where the long rod-shaped member 40 is inserted, and a flange portion. It is comprised from the elastic body interposed between 45c and the fixed plate 70, and an elastic body is the ring-shaped rubber body 50c.

  In the first embodiment to the third embodiment fixing, the fixing plate 70 is located on the upper end side of the long bar-like member from the flange portion, and is fixed to the probe body 20 while compressing the elastic body, whereas the fourth embodiment. In the embodiment, the flange portion 45c is fixed to the long bar-like member 40 on the upper end side of the long bar-like member 40 from the fixing plate 70c, and the fixing plate 70c is attached to the probe body 20 while the rubber body 50c as an elastic body is stretched. Fixed.

  Here, the fixing plate 70c and the flange portion 45c are provided with cut portions 48 and 78 at corresponding positions, respectively, and the rubber body 50c is hooked on the cut portions 48 and 78 so that the fixing plate 70c and the flange portion 45c The rubber body 50c is held therebetween.

  Even in such a configuration, the fixing plate 70c is fixed to the probe main body 20 in a state where the rubber body 50c is stretched, so that the flange portion 45c is always pulled toward the fixing plate 70c by the rubber body 50c. The long bar-shaped member 40 integrated with the flange portion 45 c is pressed toward the sensor element 10. Thereby, also by 4th embodiment, the effect similar to 1st embodiment-3rd embodiment can be acquired.

  The present invention has been described with reference to the preferred embodiments. However, the present invention is not limited to the above-described embodiments, and various improvements can be made without departing from the scope of the present invention as described below. And design changes are possible.

  For example, in the above embodiment, the case where the present invention is applied to the solid electrolyte sensor that measures the gas concentration in the gas phase is exemplified, but the present invention is not limited to this, and the solid electrolyte sensor that measures the gas concentration in the liquid phase is exemplified. The present invention can be applied. In that case, the outer electrode 11 is brought into contact with the liquid phase. When the liquid phase is a molten metal, the outer electrode is not limited to the configuration provided on the surface of the sensor element, and may be configured to be immersed in the liquid phase without contacting the sensor element.

  Further, in the above embodiment, the case where the long bar-shaped members 40 and 40b also serve as members supporting the thermocouple 60 and the lead wire 62 is illustrated, but the long bar-shaped member 40 exclusively uses the inner electrode 12 as the sensor element 10. Even if it is a member for pressing, the member which serves as the heater for heating the sensor element 10 may be sufficient.

  Further, in the above, the case where the sensor element 10 directly closes one end side of the probe body 20 is illustrated, but as shown in FIG. 9, the sensor element 10 closes the end of the cylindrical holder 98. In a state where the holder 98 is inserted, the seal member 96 seals between the inner peripheral surface of the probe main body 20 and the outer peripheral surface of the holder 98 while the holder 98 is inserted into the probe main body 20. The solid electrolyte sensor 5 having the configuration described above can be obtained. In this case, the bottomed cylindrical body 30 is configured by the probe main body 20, the holder 98, the sensor element 10, and the seal member 96.

1, 2, 5 Solid electrolyte sensor 10 Sensor element 11 Outer electrode 12 Inner electrode 20 Probe body 30 Bottomed cylindrical body 40, 40b Long bar-shaped member 43 Connecting bracket (biasing member)
45, 45c Flange (Biasing member)
50 Compression coil spring (elastic body) (biasing member)
50b Elastic cylindrical body (elastic body) (biasing member)
50c Rubber body (elastic body) (biasing member)
60 Thermocouple 70, 70c Fixed plate (biasing member)

Claims (3)

A solid electrolyte sensor using a solid electrolyte as a sensor element,
A cylindrical probe body;
A sensor element constituting at least the bottom of the bottomed cylindrical body formed by closing the probe body on one end side;
An inner electrode provided on the surface of the sensor element on the inner side of the bottom of the bottomed cylindrical body, and an outer electrode for detecting an electromotive force generated in the sensor element between the inner electrode;
A long rod-shaped member inserted into the bottomed cylindrical body;
A solid electrolyte gas sensor comprising: an urging member that urges the long bar-shaped member toward the bottom. The solid electrolyte gas sensor according to claim 1, wherein the long bar-shaped member supports at least one of a thermocouple and a lead wire. The solid electrolyte gas sensor according to claim 1, wherein the long bar-shaped member is a heater.

Images