HYDROGEN CONCENTRATION MEASURING ELEMENT, HYDROGEN CONCENTRATION MEASURING DEVICE AND HYDROGEN CONCENTRATION MEASURING METHOD
Patent Information
- Authority / Receiving Office
- FR · FR
- Patent Type
- Patents
- Current Assignee / Owner
- KK TOSHIBA
- Filing Date
- 2023-08-10
- Publication Date
- 2026-06-19
Abstract
Description
Description Title of the invention: HYDROGEN CONCENTRATION MEASURING ELEMENT, HYDROGEN CONCENTRATION MEASURING DEVICE AND METHOD FOR HYDROGEN CONCENTRATION MEASUREMENT FIELD OF THE INVENTION
[0001] Embodiments of the present invention relate to a measuring element hydrogen concentration, a hydrogen concentration measuring device comprising, and a method for measuring hydrogen concentration.
[0002] = CONTEXT OF THE INVENTION
[0003] — Conventional hydrogen concentration measuring devices include devices employing measuring methods of a catalytic combustion type, of a semiconductor type, among others.
[0004] — Technologies for the catalytic combustion type include that which uses a combustion heat on a catalyst that promotes the combustion of hydrogen and oxygen, and detects the hydrogen concentration based on a variation in resistance value occurring in a resistance measuring device (thermistor) when the temperature is changed by the heat of combustion. technologies for the semiconductor type include one that uses a variation in electrical resistance value due to a variation in carrier density at the surface of a semiconductor, such as tin oxide, caused by adsorption of a reducing gas.
[0005] — In addition, hydrogen concentration measurement technologies for power plants nuclear include technology that can determine the expansion volume of palladium due to its hydrogen occlusion and which allows to de- terminate a change of diffused light when a light having a length specific wave penetrates through an optical fiber and technology that allows determining an electrical resistance value of a hydrogen absorbing material.
[0006] A hydrogen concentration measuring device which makes it possible to determine the electrical resistance value of the hydrogen absorbing material includes: a hydrogen concentration measuring element which includes a detection part comprising a metal wire made of a hydrogen-absorbing material and a protective coating layer exhibiting hydrogen permeability and re- covering the wire and a fixing part around which the part of detection is wound; and a calculating device which calculates the concentration of hydrogen from the electrical resistance value of the measuring element of hydrogen concentration. PRIOR ART DOCUMENT PATENT DOCUMENT Patent Document 1: Japanese Patent No. 6,585,463 Summary of the invention PROBLEMS TO BE SOLVED BY INVENTION In the above-described hydrogen concentration measuring device, the metal wire elongates / contracts by thermal expansion. Therefore, when the temperature increases / decreases during shipping tests of the hydrogen concentration measuring element or during use thereof, friction occurs in a contact portion between the protective coating layer covering the metal wire and peripheral members, resulting in peeling of the protective coating layer. In particular, in the structure in which the detection part is wound around the fixing part, a portion of the detection part that comes into contact with and rubs against the fixing part changes randomly. Therefore, a peeled region of its film enlarges when the temperature repeatedly increases and decreases, resulting in deterioration of hydrogen detection performance.Another problem is that variations between products are increasing. An object of the present invention is to provide a hydrogen concentration measuring element, a hydrogen concentration measuring device and a hydrogen concentration measuring method which are capable of inhibiting deterioration of hydrogen detection performance. EMBODIMENTS FOR IMPLEMENTING THE INVENTION According to one embodiment, a hydrogen concentration measuring element is provided comprising: a wire-shaped sensing part comprising a first metal wire whose electrical resistance value is changed by hydrogen occlusion and a first protective coating layer having hydrogen permeability and covering the first metal wire; two columnar portions arranged in parallel, the two columnar portions each extending in a longitudinal direction; and a connecting portion connecting the two columnar portions to each other, wherein in each of the two columnar portions, a plurality of first grooves, which allow the sensing part to be engaged therein, are formed in the longitudinal direction at intervals from each other. Brief description of the drawings [Fig.1] is a block diagram illustrating a structure of a device for measurement of hydrogen concentration according to a first embodiment; [Fig.2] is a perspective view illustrating a structure of a hydrogen concentration measuring element in the hydrogen concentration measuring device according to the first embodiment; [Fig.3] is a front view illustrating the structure of the hydrogen concentration measuring element in the hydrogen concentration measuring device according to the first embodiment, taken along the direction of arrow AA in [Fig.2]; [Fig.4] is a side view illustrating the structure of the hydrogen concentration measuring element in the hydrogen concentration measuring device according to the first embodiment, taken along the direction of arrow BB in [Fig.2]; [Fig.5] is a longitudinal sectional view illustrating a structure of a detection part in the hydrogen concentration measuring element of the hydrogen concentration measuring device according to the first embodiment; [Fig.6] is a cross-sectional view illustrating the structure of the detection part in the hydrogen concentration measuring element of the hydrogen concentration measuring device according to the first embodiment; [Fig.7] is a longitudinal sectional view illustrating a structure of a reference detection portion in the hydrogen concentration measuring element of the hydrogen concentration measuring device according to the first embodiment; [Fig.8] is a cross-sectional view illustrating the structure of the reference detection portion in the hydrogen concentration measuring element of the hydrogen concentration measuring device according to the first embodiment; [Fig.9] is a perspective view illustrating a structure of a hydrogen concentration measuring element in a hydrogen concentration measuring device according to a second embodiment; [Fig.10] is a perspective view illustrating a structure of a hydrogen concentration measuring element in a hydrogen concentration measuring device according to a third embodiment; [Fig.11] is a perspective view illustrating a structure of a modified example of the hydrogen concentration measuring element in the hydrogen concentration measuring device according to the third embodiment; and [Fig.12] is a cross-sectional view illustrating a structure of a hydrogen concentration measuring element in a hydrogen concentration measuring device according to a fourth embodiment. DETAILED DESCRIPTION A hydrogen concentration measuring device, a hydrogen concentration measuring element, and a hydrogen concentration measuring method according to one embodiment of the present invention will be explained below with reference to the drawings. Herein, identical or similar parts are designated by common reference signs, and redundant explanation thereof will be omitted. [First embodiment] [Fig. 1] is a block diagram illustrating a structure of a hydrogen concentration measuring device 10 according to one embodiment. [Fig. 1] illustrates, by way of example, the case where a measurement target of the hydrogen concentration measuring device 10 is an atmosphere in a nuclear reactor containment vessel 1 of nuclear reactor facilities (not shown). The nuclear reactor containment vessel | is a vessel for accommodating a nuclear reactor vessel (not shown). The measurement target of the hydrogen concentration measuring device 10 is not limited to the atmosphere in the nuclear reactor containment vessel | and may be other targets such as an atmosphere whose hydrogen concentration is to be measured, for example, in hydrogen production facilities or hydrogen supply facilities. As another example, it is also possible to define, as the measurement target of the hydrogen concentration measurement device 10, the atmosphere of a space containing an engine, a fuel cell, or a fuel tank of a mobile body such as an automobile, a ship, or an aircraft that uses hydrogen as a fuel or power source. In the hydrogen concentration measurement method of the embodiment, the hydrogen concentration measurement device 10 to be explained below is prepared, and the prepared hydrogen concentration measurement device 10 is arranged in any one of these measurement targets to calculate the hydrogen concentration of the measurement target. The hydrogen concentration measuring device 10 comprises a hydrogen concentration measuring element 100, a resistor 31, a connecting line 32 and an information processing unit 33. The hydrogen concentration measuring element 100 includes a detecting part 110 (refer to [Fig. 2] to be described later) which is a metal wire having hydrogen occlusion capability and whose electrical resistance value is changed by hydrogen occlusion, and which is a part that detects hydrogen. The details of the hydrogen concentration measuring element 100 will be explained later with reference to FIGS. 5 to 8. The resistor 31 is connected to the sensing portion 110 via the connecting line 32. The resistor 31 measures the electrical resistance value of the sensing portion 110 when supplied with a current. As the resistor 31, a well-known method, for example, a four-terminal method, can be used. In the case where as the resistor 31, a measuring method such as, for example, a two-terminal or Wheatstone bridge method, other than the four-terminal method is employed, a method suitable for the measuring method is employed. The information processing unit 33 is configured by a CPU (Central Processing Unit), a memory, among others. The information processing unit 33 calculates the hydrogen concentration based on the electrical resistance value of the detection part 110 measured by the resistor 31. That is, it utilizes a phenomenon that the electrical resistance value of the detection part 110 increases upon hydrogen absorption. Based on a hydrogen concentration-electrical resistance value correlation formula obtained in advance and the electrical resistance value of the detection part 110 measured by the resistor 31, the information processing unit 33 sequentially calculates the hydrogen concentration. [Fig. 2] is a perspective view illustrating the structure of the hydrogen concentration measuring element 100 in the hydrogen concentration measuring device 10 according to the first embodiment. [Fig. 3] is a front view illustrating the structure of the hydrogen concentration measuring element 100 in the hydrogen concentration measuring device 10 according to the first embodiment, taken along the direction of the arrow AA in [Fig. 2]. Furthermore, [Fig. 4] is a side view illustrating the structure of the hydrogen concentration measuring element 100 in the hydrogen concentration measuring device 10 according to the first embodiment, taken along the direction of the arrow BB in [Fig. 2]. The hydrogen concentration measuring element 100 comprises the detection part 110, a reference detection part 120, a fixing part 130 and terminals 151 and 152. The detection part 110 is indicated by the solid line and the reference detection part 120 is indicated by the dotted lines in [Fig. 2] and [Fig. 3] to facilitate identification in the drawings. Furthermore, in [Fig. 4], the detection part 110 is shown in black and the reference detection part 120 is shown in hatched lines. The fixing part 130 comprises two columnar portions 131 arranged parallel to each other and a plate-shaped portion 132 having rectangular surfaces as a connecting portion 135 which connects the two columnar portions 131. For the convenience of the explanation below, the direction in which the surface of the plate-shaped portion 132 extends (i.e., the direction parallel to the plane defined by the connection direction by the connection portion 135 and the longitudinal direction (axial direction) of the columnar portion 131) is sometimes referred to as the horizontal direction, but this does not limit the direction in which the fixing part 130 is installed. At least the surface portion of the fixing part 130 is preferably made of an electrically insulating material. [Fig. 2] and [Fig. 3] illustrate, by way of example, the case where the columnar portion 131 has a columnar shape, but this embodiment is not limited thereto. For example, the columnar portion 131 may be a polygon, such as a rectangle in cross-section. The case where the columnar portion 131 has a columnar shape will be explained by way of example below. Furthermore, in this embodiment, the two columnar portions 131 are arranged parallel to each other. However, the two columnar portions 131 may each have an angle in the longitudinal direction as long as the two columnar portions 131 are arranged in parallel with a gap therebetween without being in direct contact with each other. That is, the two columnar portions 131 are arranged in parallel. The plate-shaped portion 132 is a flat plate, and as illustrated in [Fig. 3], when the virtual plane which is located in the middle of its thickness direction is defined in a plane Sp, the two columnar portions 131 are arranged so that their respective center lines L! and L2 are on the same plane as the plane Sp. Each columnar portion 131 is connected to each opposite side of the plate-shaped portion 132. As illustrated in [Fig. 2] and [Fig. 3], each of the two columnar portions 131 has a plurality of grooves 131a formed at intervals from each other in the longitudinal direction in at least a portion of a surface thereof opposite to the side to which the plate-shaped portion 132 is connected. Similarly, each of the two columnar portions 131 has a plurality of grooves 131b formed at intervals from each other in the longitudinal direction. The grooves 131a and 131b are formed to be inclined in the longitudinal direction, as illustrated in [Fig. 4]. That is, the grooves 131a and 131b are formed so as to make the detection portion 110 and the reference detection portion 120 reversed in the horizontal direction, i.e., in the direction in which the plate 132 extends, while continuously having a predetermined tilt angle in the axial direction.In other words, the grooves 131a and 131b are formed in each of the two columnar portions 131 to form a part of a spiral shape. At least the surfaces of the grooves 131a and 131b are preferably made of an electrically insulating material. A plurality of grooves 131a and a plurality of grooves 131b are formed of so that the groove 131a and the groove 131b appear alternately. The single continuous detection portion 110 is placed in a plurality of the grooves 131a. Furthermore, the single continuous reference detection portion 120 is placed in a plurality of the grooves 131b. As illustrated in [Fig. 3], each of the grooves 131a is formed to have a depth such that the detection portion 110 can be engaged therein and the detection portion 110 does not come into contact with the plate-shaped portion 132 when the detection portion 110 is engaged in the groove 131a. Similarly, each of the grooves 131b is formed to have a depth such that the reference detection portion 120 can be engaged therein and the reference detection portion 120 does not come into contact with the plate-shaped portion 132 when the reference detection portion 120 is engaged in the groove 131b. As illustrated in [Fig. 2], the terminal 151 of the detection part 110 and the terminal 152 of the reference detection part 120 are provided on the respective end surfaces of the two columnar portions 131. The terminals at the other end of the detection part 110 and the reference detection part 120 are provided on the respective opposite end surfaces of the two columnar portions 131. Therefore, a connection passage for connection with the terminals is formed in each of the columnar portions 131. The installation positions of these terminals are not limited to this, and may be at other portions of the columnar portions 131 or may be provided at the plate-shaped portion 132. Furthermore, the line for connection with the terminals may be placed on the surface of the columnar portion 131 or the plate-shaped portion 132. With respect to the shapes and the like of the fixing portion 130 and the grooves 131a and 131b described above, the case where the diameter of the columnar portion 131 is the smallest when the plate-shaped portion 132 is a flat plate has been explained as an example, but this embodiment is not limited to this. That is, the plate-shaped portion 132 may have an uneven surface or may be curved, as long as the detection portion 110 and the reference detection portion 120 do not come into contact with the plate-shaped portion 132. Furthermore, the shape of the plate-shaped portion 132 is not limited to a rectangular shape, and may be a polygon such as a triangle or a pentagon, for example. Furthermore, with respect to the relative position of the columnar portions 131 with respect to the plate-shaped portion 132, the respective center lines L1 and L2 need not be on the same plane as the plane Sp.Furthermore, the two columnar portions 131 need not be arranged parallel to each other. As above, the shape and dimensions of the fixing portion 130 may be determined by taking into account the condition of the arrangement around the place where the hydrogen concentration measuring element 100 is provided, the ease of maintenance of the hydrogen concentration measuring element 100, or the like. When it is necessary to protect the detection part 110 and the reference detection part 120 attached to the attachment part 130 due to the condition of the place where the hydrogen concentration measuring element 100 is installed or due to handling until the hydrogen concentration measuring element 100 is installed, for example, a protective plate such that it covers both surfaces of the attachment part 130 may be attached. Alternatively, the hydrogen concentration measuring element 100 may have a protective case that houses it. [Fig. 5] is a longitudinal sectional view illustrating the structure of the detection portion 110 in the hydrogen concentration measuring element 100 of the hydrogen concentration measuring device 10 according to the first embodiment. Furthermore, [Fig. 6] is a cross-sectional view illustrating the structure of the detection portion 110 in the hydrogen concentration measuring element 100 of the hydrogen concentration measuring device 10 according to the first embodiment. The sensing portion 110 comprises a metal wire 111 and a protective coating layer 112 provided on the outer side of the metal wire 111. The metal wire 111 acts as the first metal wire and the protective coating layer 112 acts as the first protective coating layer. The metal wire 111 contains at least one of palladium and niobium and has hydrogen occluding capability. The diameter of the metal wire 111 having the hydrogen occluding capability is not particularly limited and is preferably about 1 µm or more and 1000 µm or less. This is because the metal wire 111, if it has a diameter of less than 1 µm, has a high risk of breaking due to its tension, and the metal wire 111, if it has a diameter of more than 1000 µm, has a low resistance value per unit length, which results in deterioration of the hydrogen detection performance. The protective coating layer 112 contains at least one of an oxide, a nitride, and a carbide of silicon or aluminum, and is made of an inorganic substance allowing selective permeation by hydrogen. The thickness of the protective coating layer 112 is preferably 5 nm or more and 200 nm or less. The protective coating layer 112 having a thickness of 5 nm or more has the remarkable effect of preventing the progress of a side reaction attributable to chemical species from an external gas layer. oxygen, iodine or the like. In addition, the protective coating layer 112 having a thickness of 200 nm or less has excellent hydrogen permeability. The detection part 110 is here formed by applying or vapor deposition of the protective coating layer | 12 onto the metal wire 111 having the hydrogen occlusion capability. As the applying or vapor deposition method, a typical method is used, such as CVD (chemical vapor deposition), PVD (physical vapor deposition), a sol-gel method, or an impregnation method. Here, CVD (chemical vapor deposition) includes atomic layer deposition having a high vapor deposition coating capability even if its target is a three-dimensional object. Furthermore, the detection part 110 formed by any of these methods is used after heat treatment at 350°C or higher and 500°C or lower. The time for applying or depositing the protective coating layer 112 on the wire 111 may be either before or after the wire 111 is attached to the attachment portion 130. However, when considering the deformation of the wire 111 when attached to the attachment portion 130 and the risk of the protective coating layer 112 peeling due to friction between the wire 111 and the attachment portion 130, it is desirable to apply or deposit the protective coating layer 112 on the wire 111 after the wire 111 is attached to the attachment portion 130. In this case, application or deposition by atomic layer deposition having high vapor deposition coating capability can be performed even if, for example, a three-dimensional object is set as the target. There is no problem even when part or all of the hydrogen concentration measuring element 100 other than the metal wire 111 is covered with the protective coating layer 112. [Fig. 7] is a longitudinal sectional view illustrating the structure of the reference detection portion 120 in the hydrogen concentration measuring element 100 of the hydrogen concentration measuring device 10 according to the first embodiment. Furthermore, [Fig. 8] is a cross-sectional view illustrating the structure of the reference detection portion 120 in the hydrogen concentration measuring element 100 of the hydrogen concentration measuring device 10 according to the first embodiment. The reference sensing portion 120 comprises a metal wire 121 and a protective coating layer 122 covering the radially outer surface of the metal wire 121. The metal wire 121 acts as a second metal wire and the protective coating layer 122 acts as a second coating layer protective. The wire 121 is made of a material whose electrical resistance value varies with a change in temperature, such as platinum used in a resistance temperature detector, and does not have hydrogen occlusion capability. The diameter of the metal wire 121 is about 1 μm or more and 1000 μm or less similarly to the diameter of the metal wire 111 of the sensing portion 110. Furthermore, the protective coating layer 122 contains at least one of an oxide, a nitride, and a silicon or aluminum carbide, and is made of an inorganic substance allowing the selective permeation of hydrogen, similarly to the protective coating layer 112 of the sensing portion 110. The thickness of the protective coating layer 122 is preferably 5 nm or more and 200 nm or less similarly to the protective coating layer 112 of the sensing portion 110. The information processing unit 33 calculates the temperature in the vicinity of the metal wire 121 on the basis of the electrical resistance value of the metal wire 121 of the reference detection part 120. Furthermore, the processing unit information 33 removes a component attributable to temperature from the electrical resistance value measured in the metal wire 111 of the detection part 110, separates a component attributable to hydrogen occlusion, and calculates the hydrogen concentration. As a modified example of the hydrogen concentration measuring element 100 according to this embodiment, the hydrogen concentration measuring element 100 may be configured to include an ambient atmosphere thermometer that detects the ambient temperature in the vicinity of the hydrogen concentration measuring element 100, instead of including the reference detection part 120. In this case, the dependence characteristic of the detection part 110 on the ambient temperature is obtained in advance. The information processing unit 33 may perform correction to remove a temperature-dependent component in the output of the detection part 110, separate a component attributable to hydrogen occlusion, and calculate the hydrogen concentration from the output of the detection part 110 and the output of the ambient atmosphere thermometer.As described above, in this embodiment or its modified example, the fixing part 130 includes the two columnar portions 131 and the plate-shaped portion 132 as a connecting portion 135 which connects them, and the grooves 131a and 131b for changing direction are formed in the columnar portions 131 to have such a depth as to prevent the detection part 110 and the reference detection part 120 from coming into contact with the plate-shaped portion 132. Accordingly, it is possible to limit the region of the connecting part 135. detection portion 110 and the reference detection portion 120 coming into contact with the fixing portion 130, to inhibit the enlargement of peeled regions of the protective coating layers 112 and 122 of the detection portion 110 and the reference detection portion 120 respectively due to an increase and a decrease in temperature, and to ensure stable performance. Furthermore, by facilitating the circulation of gas around the detection portion 110 and the reference detection portion 120, changes in the hydrogen concentration in the atmosphere can be detected more quickly. [Second embodiment] [Fig.9] is a perspective view illustrating a structure of a hydrogen concentration measuring element 100a in a hydrogen concentration measuring device 10 according to a second embodiment. This embodiment is a modification of the first embodiment, wherein ventilation holes 132a communicating with the front surface and the rear surface of the plate-shaped portion 132 are formed in the plate-shaped portion 132. Otherwise, it is the same as the first embodiment. [Fig. 9] illustrates the case where the number of ventilation holes 132a is three, but one or more ventilation holes other than three may be provided. Furthermore, [Fig. 9] illustrates, by way of example, the case where the ventilation holes 132a are circular, but they may have other shapes. The provision of the ventilation holes 132a makes it possible to further promote the circulation of the gas in contact with the detection portion 110 and the reference detection portion 120 and to further enhance the responsiveness to variations in the hydrogen concentration in the gas to be measured. [Third embodiment] [Fig. 10] is a perspective view illustrating a structure of a hydrogen concentration measuring element 100b in a hydrogen concentration measuring device 10 according to a third embodiment. This embodiment is a modification of the first embodiment, in which a fixing portion 130a differs from the fixing portion 130 in the first embodiment, but otherwise it is identical to the first embodiment. In the hydrogen concentration measuring element 100b in this embodiment, the fixing part 130a includes cylindrical portions 131p and through rods 131g passing through the cylindrical portions 131p in the longitudinal direction respectively, instead of the columnar portions 131 in the first embodiment. The cylindrical portions 131p each have the grooves 131a and 131b formed therein similarly to the columnar portion 131. The material of the cylindrical portion 131p is preferably an electrically conductive material. insulating. Each of the through rods 131q protrudes from both longitudinal ends of each of the cylindrical portions 131p, and the protruding portions are each provided with an external thread not shown. The through rods 131q are made of metal, for example. Furthermore, the fixing part 130a includes two connecting plates 133 as the connecting portion 135. In [Fig. 10], the illustration of the connecting plate 133 on the far side of the drawing is omitted. Each of the connecting plates 133 includes two through holes 133a, which allow the through rods 131q to pass through them respectively, formed therein. The respective connecting plates 133 are provided at the ends on one side and at the ends on the other side of the cylindrical portions 131p. At each of the ends of the cylindrical portion 131p, the through rod 131q passes through the through hole 133a and is tightened by a nut not shown. [Fig.11] is a perspective view illustrating a structure of a modified example of the hydrogen concentration measuring element in the hydrogen concentration measuring device according to the third embodiment. In [Fig.11], as the connecting portion 135, a plurality of links 134 connect the two column portions 131. In the hydrogen concentration measuring element 100b according to this embodiment configured as above and a hydrogen concentration measuring element 100c according to the modified example of this embodiment, the connecting portion 135 does not interfere with the flow of gas around the detection part 110 and the reference detection part 120 arranged between the two cylindrical portions 131p, thereby not causing gas retention. Accordingly, it is possible to further enhance the responsiveness to variations in the hydrogen concentration in the gas to be measured. [Fourth embodiment] [Fig. 12] is a cross-sectional view illustrating a structure of a hydrogen concentration measuring element 100d in a hydrogen concentration measuring device 10 according to a fourth embodiment. This embodiment is a modification of the first embodiment, in which a plurality of longitudinal grooves 131c are formed in each of two columnar portions 131 of a fixing part 130d, which differs from the columnar portions 131 in the first embodiment, and in other respects, it is identical to the first embodiment. The longitudinal grooves 131c are formed in the circumferential region where the grooves 131a and 131b of each of the columnar portions 131 are formed, in- intervals from each other in the circumferential direction so as to extend in the longitudinal direction of each of the columnar portions 131. The longitudinal grooves 131c are formed to have a depth deeper than the depth of the grooves 131a and 131b, as illustrated in [Fig.12]. A plurality of the longitudinal grooves 131c are formed in this manner, and thus the range where the detection portion 110 and the reference detection portion 120 come into contact with a fixing portion 130d further decreases, thereby making it possible to further inhibit the widening of peeled regions of the protective coating layers 112 and 122 of the detection portion 110 and the reference detection portion 120 respectively due to an increase and decrease in temperature, and to ensure more stable performance. Furthermore, the longitudinal grooves 131c create gas circulation in the longitudinal direction of the columnar portion 131, and the gas circulation around the detection portion 110 and the reference detection portion 120 at the columnar portion 131 makes it possible to more quickly detect changes in the hydrogen concentration in the atmosphere. As above, according to the explained embodiments, it becomes possible to provide the hydrogen concentration measuring element, the hydrogen concentration measuring device and the hydrogen concentration measuring method which are capable of inhibiting deterioration of hydrogen detection performance. [Other embodiments] Although the embodiment of the present invention has been described, this embodiment has been presented for the purpose of example only, and is not intended to limit the scope of the invention. For example, according to the embodiment, the system is employed to cool the main unit side and the excitation machine side separately. However, the present invention is not limited to this system. For example, the excitation device having the stirring blades of the present invention can be used in a rotating electric machine of a type in which a cooling gas, cooled by a cooler, is circulated through a main unit and an excitation machine connected to the main unit by a conduit.Furthermore, the embodiment described above may be put into operation in a variety of different ways and, if desired, any of the components thereof may be omitted, replaced or altered in a variety of different ways without departing from the spirit and scope of the invention. Therefore, the embodiment described above and modifications thereto fall within the spirit and scope of the present invention, which is specifically defined by the appended claims, as well as their equivalents. EXPLANATION OF REFERENCE SYMBOLS . 1. nuclear reactor containment building, 10... measuring device hydrogen concentration, 31. resistor, 32. connecting line, 33. information processing unit, 100, 100a, 100b, 100c, 100d.. hydrogen concentration measuring element, 110... detection part, 111. metal wire, 112... protective coating layer, 120... reference detection part, 121... metal wire, 122... protective coating layer, 130, 130a, 130c.. fixing part, 131... columnar portion, 131a, 131b... groove, 131c... longitudinal groove, 13 1p... cylindrical portion, 131g.. through rod, 132... plate-shaped portion, 132a... ventilation hole, 133. connecting plate, 133a... hole crossing, 134 connecting rod, 135. connecting portion, 151, 152... terminal
Claims
Claims
1. A hydrogen concentration measuring element comprising: a wire-shaped sensing portion comprising a first wire me- metal whose electrical resistance value is modified by hydrogen occlusion and a first coating layer protector having permeability to hydrogen and covering the first metal wire; two columnar portions arranged in parallel, the two portions in column each extending in a longitudinal direction; and a connecting portion connecting the two column portions to each other the other, in which in each of the two columnar portions, a plurality of first grooves, which allow the sensing part to be engaged in these are formed in the longitudinal direction at intervals from each other.
2. A hydrogen concentration measuring element according to claim 1, in which the connecting portion is a polygonal plate-shaped portion, and the columnar portion is fixed along each of two opposite sides of the plate-shaped portion.
3. A hydrogen concentration measuring element according to claim 2, in which the plate-shaped portion has at least one commu- nication formed to communicate with the front and rear surfaces of this one.
4. A hydrogen concentration measuring element according to claim 1, in which the connecting portion is a plurality of connecting rods.
5. A hydrogen concentration measuring element according to claim 1, in which each of the two columnar portions includes a cylindrical portion made of an insulating material and a through rod made of metal, the through rod passing through the interior of the cylindrical portion and comprising, at both ends thereof, projecting portions projecting from the cylindrical portion.
6. A hydrogen concentration measuring element according to claim 1, in which in a circumferential range in each of the two portions in column, where a plurality of first grooves are formed, a plurality of longitudinal grooves, which extend in the long- horizontal of the columnar portion and are formed more deeply that the first grooves are formed.
7. A hydrogen concentration measuring element according to claim 1, in which each of a plurality of the first grooves is inclined relative to the longitudinal direction.
8. A hydrogen concentration measuring element according to claim 1, further comprising: a wire-shaped reference detection part comprising a second metal wire whose electrical resistance value is modified by a change in temperature and a second layer of protective coating covering the second wire, in which in the columnar portion, a plurality of second grooves, which are formed to be arranged adjacent to a plurality of first grooves and allow the reference detection part to be engaged in these, are formed.
9. A hydrogen concentration measuring element according to claim 1, in which at least one surface of a portion of each of the first grooves in contact with the sensing portion has electrical insulation.
10. A hydrogen concentration measuring device comprising: the hydrogen concentration measuring element according to one of any of claims 1 to 9; and an information processing unit that calculates a concentration of hydrogen from an electrical resistance value of the first wire metallic element of the hydrogen concentration measuring element.
11. | A method of measuring hydrogen concentration comprising: the preparation of a hydrogen concentration measuring element, the hydrogen concentration measuring element comprising: a detection part in [form of (it comprising a first metal wire whose electrical resistance value is modified by occlusion hydrogen and a first layer of protective coating having hydrogen permeability and covering the first wire metallic; two columnar portions arranged in parallel, the two columnar portions each extending in a longitudinal direction tudinal; and a connecting portion connecting the two columnar portions to each other, wherein in each of the two columnar portions, a plurality of first grooves, which allow the detection part to be engaged therein, are formed in the longitudinal direction at intervals from each other; the arrangement of the hydrogen concentration measuring element in a measuring target; and calculating a hydrogen concentration of the measurement target from the electrical resistance value of the first metal wire of the hydrogen concentration measuring element.