JP4430520B2 - Gas sensor - Google Patents

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JP4430520B2
JP4430520B2 JP2004346822A JP2004346822A JP4430520B2 JP 4430520 B2 JP4430520 B2 JP 4430520B2 JP 2004346822 A JP2004346822 A JP 2004346822A JP 2004346822 A JP2004346822 A JP 2004346822A JP 4430520 B2 JP4430520 B2 JP 4430520B2
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gas
holding plate
gas sensor
circuit board
energization
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JP2006153737A (en
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孝 佐々木
英俊 大石
卓志 斉藤
昭博 鈴木
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Honda Motor Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Description

本発明は、ガスセンサに関し、特に通電部の腐食または漏電を防止するガスセンサに関する。   The present invention relates to a gas sensor, and more particularly, to a gas sensor that prevents corrosion or leakage of a current-carrying part.

一般に、ガスの特定成分や濃度の検出にガスセンサが使用され、その用途も防災用の他、例えば、固体高分子膜型燃料電池による発電システム等のプロセス制御の分野でも広く活用されている。
固体高分子膜型燃料電池は、固体高分子電解質膜を燃料極と酸素極とで両側から挟み込んで形成されたセルを多数積層して構成されたスタックからなり、燃料極には燃料として水素が供給され、酸素極には酸化剤として空気が供給されて、燃料極で触媒反応により発生した水素イオンが、固体高分子電解質膜を通過して酸素極まで移動して、酸素極で酸素と電気化学反応を起こして発電するようになっている。 In general, a gas sensor is used to detect a specific component or concentration of a gas, and its application is widely used in the field of process control such as a power generation system using a solid polymer membrane fuel cell as well as for disaster prevention.
A solid polymer membrane fuel cell is composed of a stack composed of a plurality of cells formed by sandwiching a solid polymer electrolyte membrane between a fuel electrode and an oxygen electrode from both sides. Hydrogen is used as a fuel in the fuel electrode. Air is supplied as an oxidant to the oxygen electrode, and hydrogen ions generated by a catalytic reaction at the fuel electrode move to the oxygen electrode through the solid polymer electrolyte membrane, and oxygen and electricity are generated at the oxygen electrode. A chemical reaction occurs to generate electricity.

このような固体高分子膜燃料電池において、従来、例えば特開平６−２２３８５０号公報に開示された燃料電池の保護装置のように、燃料電池の酸素極側の排出系に水素ガスを検出するガスセンサを備え、このガスセンサによって、燃料極側の水素が固体高分子電解質膜を通じて酸素極側に漏洩したことを検知したときは、燃料の供給を遮断する保護装置が知られている。
特開平６−２２３８５０号公報 Conventionally, in such a polymer electrolyte fuel cell, a gas sensor for detecting hydrogen gas in the exhaust system on the oxygen electrode side of the fuel cell, such as a protection device for a fuel cell disclosed in Japanese Patent Application Laid-Open No. 6-223850, for example. A protective device is known that shuts off the supply of fuel when it is detected by this gas sensor that hydrogen on the fuel electrode side has leaked to the oxygen electrode side through the solid polymer electrolyte membrane.
JP-A-6-223850

しかしながら、前記のような固体高分子膜型燃料電池等の燃料電池においては、固体高分子電解質膜のイオン導電性を保つために、燃料電池に供給される反応ガス（例えば、水素や空気）には加湿装置等によって水（加湿水）が混合されており、さらに、燃料電池の作動時には電気化学反応による反応生成水が生成されるため、燃料電池のオフガス、特に酸素極側のオフガスは高湿潤のガスとなっている。
このため、前記従来技術に係る燃料電池の保護装置においては、燃料電池から排出される高湿潤のオフガスによって、オフガスの流路内に配置されたガスセンサに結露が発生する場合があり、ガスセンサの感度の低下や故障等が生じるおそれがあった。 However, in a fuel cell such as a solid polymer membrane fuel cell as described above, in order to maintain the ionic conductivity of the solid polymer electrolyte membrane, a reaction gas (for example, hydrogen or air) supplied to the fuel cell is used. In addition, water (humidified water) is mixed by a humidifier, etc., and reaction product water is generated by an electrochemical reaction when the fuel cell is operated. Therefore, the off-gas of the fuel cell, particularly the off-gas on the oxygen electrode side, is highly moist. It has become a gas.
For this reason, in the fuel cell protection device according to the prior art, condensation may occur in the gas sensor disposed in the flow path of the off gas due to the highly humid off gas discharged from the fuel cell. There was a risk of degradation or failure.

本発明は、このような背景に鑑みてなされたものであり、通電部の腐食または漏電を防止して、安定した感度を継続して保持することにより、信頼性が高く、寿命の長いガスセンサを提供することを課題とする。   The present invention has been made in view of such a background, and by preventing corrosion or leakage of a current-carrying part and continuously maintaining a stable sensitivity, a highly reliable and long-life gas sensor is provided. The issue is to provide.

前記課題を解決するため、本発明のガスセンサは、被検出ガス内に設置され、前記被検出ガスを検出する検出部と、前記検出部からの出力を処理する回路部と前記検出部とを電気的に接続するための通電部と、前記通電部を封止する絶縁部材と、を有するガスセンサであって、前記通電部は、保持板を貫通したピン状に形成され、前記検出部は、前記保持板の一方の面側において前記通電部に接続され、前記保持板の他方の面は、前記保持板の被取付面に対面し、前記他方の面と前記被取付面の間の部分において、前記通電部の周囲が前記絶縁部材で封止されるとともに、前記一方の面側から突出した前記通電部の突出部分が、前記被検出ガスとの接触を阻止するように前記絶縁部材で封止されたことを特徴とする。 In order to solve the above problems, a gas sensor according to the present invention is installed in a gas to be detected, and electrically detects a detection unit that detects the gas to be detected, a circuit unit that processes an output from the detection unit, and the detection unit. A gas sensor having a current-carrying part for connecting the power supply and an insulating member for sealing the current-carrying part, wherein the current-carrying part is formed in a pin shape penetrating a holding plate, Connected to the current-carrying portion on one surface side of the holding plate, the other surface of the holding plate faces the mounted surface of the holding plate, and in a portion between the other surface and the mounted surface, The periphery of the current-carrying part is sealed with the insulating member, and the protruding part of the current-carrying part protruding from the one surface side is sealed with the insulating member so as to prevent contact with the gas to be detected It is characterized by that.

このような構成によれば、通電部の被検出ガス内に位置する部分が絶縁部材で封止され、通電部が被検出ガスから遮断されているため、被検出ガスが高湿潤であっても、通電部の腐食等による感度の低下、および漏電等の発生を防止することができる。   According to such a configuration, the portion of the energization unit located in the detected gas is sealed with the insulating member, and the energization unit is shielded from the detected gas, so that even if the detected gas is highly humid, In addition, it is possible to prevent a decrease in sensitivity due to corrosion of the current-carrying part and the occurrence of leakage.

また、保持板を貫通してピン状に形成された通電部において、被検出ガスを検出する検出部が接続される前記保持板の一方の面側から突出した前記通電部の突出部分は、被検出ガスに直接的にさらされるため、この部分を封止することにより、通電部の腐食等を防止することができる。
さらに、保持板の他方の面と前記被取付面の間の部分をも封止することにより、保持板の取付面から通電部への被検出ガスの侵入を阻止して、通電部を被検出ガスから完全に遮断することができる。 Further , in the energization part formed in a pin shape penetrating the holding plate, the protruding portion of the energization part protruding from one surface side of the holding plate to which the detection part for detecting the detection gas is connected is Since it is directly exposed to the detection gas, the energization portion can be prevented from corroding by sealing this portion.
In addition, by sealing the portion between the other surface of the holding plate and the mounted surface, the gas to be detected is prevented from entering the conductive portion from the mounting surface of the holding plate, and the conductive portion is detected. It can be completely cut off from the gas.

また、前記した絶縁部材は、エポキシ系樹脂を基材とする。このような構成により、特に、水素ガスおよび水素ガスの燃焼触媒に対して安定しているため、安定した感度を継続して保持することができる。エポキシ樹脂を採用したのは、例えば、シリコーン系樹脂は、水素ガスの燃焼触媒と反応して触媒を劣化させるおそれがあるからである。 Further, the above-described insulating member, you an epoxy resin as a base. With such a configuration, since it is particularly stable with respect to hydrogen gas and a hydrogen gas combustion catalyst, stable sensitivity can be continuously maintained. It chose epoxy resin, for example, silicon corn-based resin, there is a possibility to degrade the catalyst reacts with the combustion catalyst of the hydrogen gas.

本発明によれば、通電部の腐食または漏電を防止して、安定した感度を継続して保持することにより、信頼性が高く、寿命の長いガスセンサを提供することができる。   According to the present invention, it is possible to provide a highly reliable and long-life gas sensor by preventing corrosion or leakage of the current-carrying part and continuously maintaining stable sensitivity.

次に、本発明の実施形態について、適宜図面を参照しながら詳細に説明する。参照する図面において、図１は本発明の実施形態に係るガスセンサの取付状態を示す断面図であり、図２は本発明の実施形態に係るガスセンサの取付状態を示す側面図であり、図３は本発明の実施形態に係るガスセンサの通電部の封止構造を示す図１の部分拡大断面図であり、図４は本発明の実施形態に係るガスセンサの検出部を模式的に示す図１の部分拡大図である。
なお、本実施形態においては、本発明に係るガスセンサを、固体高分子膜型燃料電池による発電システムにおいて、上記燃料電池の酸素極側の排出系に設置して、水素ガスを検出する場合を例として説明するが、水素極側の排出系に設置する場合も同様であり、排出系に限られるものでもない。
また、以下の説明において、説明の便宜上、図１において、本図の下側を本ガスセンサの下側とし、本図の上側を本ガスセンサの上側という場合があり、各構成部品についても同様である。 Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In the drawings to be referred to, FIG. 1 is a cross-sectional view showing a mounting state of a gas sensor according to an embodiment of the present invention, FIG. 2 is a side view showing a mounting state of a gas sensor according to an embodiment of the present invention, and FIG. FIG. 4 is a partially enlarged cross-sectional view of FIG. 1 showing a sealing structure of a current-carrying portion of a gas sensor according to an embodiment of the present invention, and FIG. 4 is a portion of FIG. 1 schematically showing a detection portion of the gas sensor according to an embodiment of the present invention. It is an enlarged view.
In the present embodiment, the gas sensor according to the present invention is installed in a discharge system on the oxygen electrode side of the fuel cell in a power generation system using a solid polymer membrane fuel cell, and the case where hydrogen gas is detected is taken as an example. However, the same applies to the case where it is installed in the discharge system on the hydrogen electrode side, and the present invention is not limited to the discharge system.
In the following description, for convenience of description, in FIG. 1, the lower side of the figure may be the lower side of the gas sensor, and the upper side of the figure may be the upper side of the gas sensor, and the same applies to each component. .

最初に、図１を参照して、本発明の実施形態に係るガスセンサ、およびその取付状態について説明する。
図１に示すように、本発明の実施形態に係るガスセンサ１は、水素ガスの濃度を検出する検出部２と、この検出部２を保持する保持板４と、前記検出部２から出力される出力信号を回路部２０に伝達する通電部３と、前記出力信号を増幅し水素ガスの濃度を算出する回路部２０と、オフガスを導入するガス導入部３０とを備えて構成されている。
そして、前記ガスセンサ１は、オフガス流通管１１の上部に設けられた取付座１１ａに固着され、前記検出部２が前記オフガス流通管１１内を流通するオフガスを臨む状態に設置されている。
なお、本実施形態においては、水素検出用のガスセンサとして、水素ガスの触媒燃焼熱による抵抗値の変化を計測して、水素ガスの濃度を検出するガス接触燃焼式のものを使用している。 Initially, with reference to FIG. 1, the gas sensor which concerns on embodiment of this invention, and its attachment state are demonstrated.
As shown in FIG. 1, a gas sensor 1 according to an embodiment of the present invention outputs a detection unit 2 that detects the concentration of hydrogen gas, a holding plate 4 that holds the detection unit 2, and the detection unit 2. The energization unit 3 transmits an output signal to the circuit unit 20, the circuit unit 20 amplifies the output signal to calculate the concentration of hydrogen gas, and a gas introduction unit 30 that introduces off-gas.
The gas sensor 1 is fixed to a mounting seat 11 a provided at the upper part of the off gas circulation pipe 11, and the detection unit 2 is installed in a state facing the off gas flowing through the off gas circulation pipe 11.
In the present embodiment, a gas contact combustion type sensor is used as a gas sensor for hydrogen detection, which measures a change in resistance value due to catalytic combustion heat of hydrogen gas and detects the concentration of hydrogen gas.

前記検出部２は、図１に示すように、前記ガス導入部３０に形成されたガス検知室３１内に配置されている。また、検出部２は、図４に示すように、検出素子２ａと補償素子２ｂとを１対として構成されており、保持板４の下面側で通電部３と電気的に接続されている。
なお、各素子２ａ，２ｂは、抵抗となるコイルをアルミナで被覆したものであり、検出素子２ａにはアルミナに白金が担持されており、水素に触媒作用して触媒燃焼反応が起こる。この触媒燃焼による燃焼熱を利用して、ガス接触燃焼式のガスセンサ１は、検出素子２ａと補償素子２ｂとでブリッジ回路を構成し、前記燃焼熱による検出素子２ａ抵抗値の変化を補償素子２ｂと比較することによって水素ガスの濃度を計測している。 As shown in FIG. 1, the detection unit 2 is disposed in a gas detection chamber 31 formed in the gas introduction unit 30. Further, as shown in FIG. 4, the detection unit 2 includes a detection element 2 a and a compensation element 2 b as a pair, and is electrically connected to the energization unit 3 on the lower surface side of the holding plate 4.
Each element 2a, 2b is a resistance coil coated with alumina. The detection element 2a has platinum supported on alumina, and catalyzes hydrogen to cause a catalytic combustion reaction. Using the combustion heat generated by the catalytic combustion, the gas contact combustion type gas sensor 1 forms a bridge circuit with the detection element 2a and the compensation element 2b, and changes the resistance value of the detection element 2a due to the combustion heat. The concentration of hydrogen gas is measured by comparing with.

前記通電部３は、図３および図４に示すように、ピン状に形成され、保持板４を貫通して、前記検出部２からの出力信号を処理する回路を備えた回路基板２２と前記検出素子２ａおよび補償素子２ｂとをそれぞれ電気的に接続している。この検出素子２ａおよび補償素子２ｂは、一例として、それぞれ２本の接続端２ａ1，２ａ2，２ｂ1，２ｂ2を有している。したがって、通電部３は、各素子２ａ，２ｂについて２本、合計で４本のピン状の端子として構成されている。
なお、本実施形態においては、通電部３は、ピン状に形成されているが、必ずしも一体的に構成されている必要はなく、導線を束ねたコードとして形成されたものでもよく、ピンの断面形状や本数等にも関わらず、本発明を実施することができる。さらに、前記回路基板２２および各素子２ａ，２ｂと通電部３との接続も半田付けや溶着等種々の手段がある。 As shown in FIGS. 3 and 4, the energization unit 3 is formed in a pin shape, passes through the holding plate 4, and includes a circuit board 22 including a circuit for processing an output signal from the detection unit 2 and the circuit board 22. The detection element 2a and the compensation element 2b are electrically connected to each other. As an example, each of the detection element 2a and the compensation element 2b has two connection ends 2a 1 , 2a 2 , 2b 1 , 2b 2 . Accordingly, the energization unit 3 is configured as four pin-like terminals in total, two for each of the elements 2a and 2b.
In addition, in this embodiment, although the electricity supply part 3 is formed in the pin shape, it does not necessarily need to be comprised integrally and may be formed as a code | cord | chord which bundled conducting wire, and is a cross section of a pin The present invention can be carried out regardless of the shape, number, etc. Furthermore, there are various means such as soldering and welding for connecting the circuit board 22 and each element 2a, 2b to the energizing portion 3.

本実施形態に係るガスセンサ１は、図１に示すように、前記保持板４を備えて構成されている。この保持板４は、リング状に形成され、４本のピン状の通電部３が貫通して保持される貫通孔４ａを備えている（図３、図４を参照）。   As shown in FIG. 1, the gas sensor 1 according to this embodiment includes the holding plate 4. The holding plate 4 is formed in a ring shape and includes a through hole 4a through which the four pin-shaped current-carrying portions 3 are held (see FIGS. 3 and 4).

本実施形態に係るガスセンサ１の通電部３は、図３および図４に示すように、通電部３のうち被検出ガス内に設置される部分が絶縁部材であるエポキシ樹脂５（５ａ，５ｂ）で封止されるように構成されている。
具体的には、図３に示すように、保持板４の一方の面４ｃ（下面、検出部２と接続する側）から下側に突出した通電部３の突出部分３ａはエポキシ樹脂５ａで封止し、保持板４の他方の面４ｄ（上面）と保持板４の被取付面である回路基板２２の下面２２ａとの間の部分はエポキシ樹脂５ｂでそれぞれ封止する構造としている。ここで、本実施形態において、エポキシ樹脂を採用したのは、例えば、シリコーン系樹脂は、水素ガスの燃焼触媒と反応して触媒を劣化させるおそれがあるからである。
なお、検出部については、特に封止する構成としていないが、エポキシ樹脂等で封止してもよいし、絶縁被覆等で封止されていればそれでもよい。 As shown in FIGS. 3 and 4, the energization unit 3 of the gas sensor 1 according to the present embodiment includes an epoxy resin 5 (5 a, 5 b) in which the portion of the energization unit 3 that is installed in the detected gas is an insulating member. It is comprised so that it may be sealed with.
Specifically, as shown in FIG. 3, the protruding portion 3a of the energizing portion 3 protruding downward from one surface 4c (the lower surface, the side connected to the detecting portion 2) of the holding plate 4 is sealed with an epoxy resin 5a. The portion between the other surface 4d (upper surface) of the holding plate 4 and the lower surface 22a of the circuit board 22, which is the mounting surface of the holding plate 4, is sealed with an epoxy resin 5b. In the present embodiment, it was employed an epoxy resin, for example, silicon corn-based resin, there is a possibility to degrade the catalyst reacts with the combustion catalyst of the hydrogen gas.
The detection unit is not particularly configured to be sealed, but may be sealed with an epoxy resin or the like, or may be used as long as it is sealed with an insulating coating or the like.

前記オフガス流通管１１は、図１に示すように、回路部２０が固着される取付座１１ａと、ガス導入部３０が装着される貫通孔１１ｂ（図３参照）とを備えている。
オフガス流通管１１は、パイプ状であって、このオフガス流通管１１の上部には、外周面から内周面に向かって垂直に貫通孔１１ｂが形成され、この貫通孔１１ｂには、ガス導入部３０を構成する筒状部３２が内嵌されている。また、取付座１１ａは、オフガス流通管１１の外周面の上部に設けられ、取付座１１ａの上面は、水平面に形成され、ケース２１のフランジ部２１ａが固着される（図２を併せて参照）。 As shown in FIG. 1, the off-gas circulation pipe 11 includes a mounting seat 11 a to which the circuit unit 20 is fixed, and a through hole 11 b (see FIG. 3) in which the gas introduction unit 30 is mounted.
The off-gas circulation pipe 11 has a pipe shape, and a through-hole 11b is formed in the upper part of the off-gas circulation pipe 11 from the outer peripheral surface to the inner peripheral surface. The gas introduction portion is formed in the through-hole 11b. A cylindrical portion 32 constituting 30 is fitted. Moreover, the mounting seat 11a is provided in the upper part of the outer peripheral surface of the off gas distribution pipe 11, and the upper surface of the mounting seat 11a is formed in a horizontal surface, and the flange portion 21a of the case 21 is fixed (see also FIG. 2). .

ガスセンサ１の回路部２０は、図１および図２に示すように、回路基板２２が埋設されたケース２１により構成されている。
前記回路部２０のケース２１は、平面視で矩形状をなし、オフガス流通管１１に沿った長手方向の両端面には、オフガス流通管１１に固着するためのフランジ部２１ａが形成され、このフランジ部２１ａには取付穴２１ｂが設けられている。この取付穴２１ｂに取付ねじ２３を挿通して回路部２０をオフガス流通管１１の取付座１１ａに固着している。 As shown in FIGS. 1 and 2, the circuit unit 20 of the gas sensor 1 includes a case 21 in which a circuit board 22 is embedded.
The case 21 of the circuit unit 20 has a rectangular shape in plan view, and flange portions 21 a for fixing to the off-gas circulation pipe 11 are formed on both end faces in the longitudinal direction along the off-gas circulation pipe 11. The part 21a is provided with a mounting hole 21b. The mounting screw 23 is inserted into the mounting hole 21b to fix the circuit unit 20 to the mounting seat 11a of the off-gas flow pipe 11.

ガス導入部３０は、図３に示すように、ケース２１の下部に形成されている。このガス導入部３０は、筒状部３２と、周壁部３３と、撥水フィルタ３４と、シールリング３５とを備えている。このガス導入部３０の内側には、ガス検知室３１が形成されており、このガス検知室３１には、水素ガスを検知する検出部２と、保持板４に保持された通電部３とが配置されている。そして、ガス検知室３１内に配置された通電部３は、回路基板２２の所定の位置に導通されて、通電部３と回路基板２２とが電気的に接続されるように構成されている。   The gas introduction part 30 is formed in the lower part of the case 21, as shown in FIG. The gas introduction part 30 includes a cylindrical part 32, a peripheral wall part 33, a water repellent filter 34, and a seal ring 35. A gas detection chamber 31 is formed inside the gas introduction unit 30. The gas detection chamber 31 includes a detection unit 2 that detects hydrogen gas and an energization unit 3 that is held by a holding plate 4. Has been placed. The energization unit 3 disposed in the gas detection chamber 31 is configured to be electrically connected to a predetermined position of the circuit board 22 so that the energization unit 3 and the circuit board 22 are electrically connected.

前記筒状部３２は、図３に示すように、有底の円筒形状をなし、その底部には、オフガス流路１０から被検出ガスを導入する導入口３２ａが形成されている。筒状部３２は、その下面３２ｂがオフガス流通管１１の内周面１１ｃから突出することなくちょうど内周面１１ｃに接するようにオフガス流通管１１に配置されている。また、筒状部３２の外周面３２ｃには、シールリング３５が外嵌されている。
一方、筒状部３２の内周面側には、円筒状に形成された周壁部３３が装着され、この周壁部３３で囲まれた空間が被検出ガスのガス検知室３１を形成している。
また導入口３２ａには、周壁部３３に内嵌された防水のための撥水フィルタ３４が設けられており、水滴状の水が検知室３１内に侵入するのを防止している。 As shown in FIG. 3, the cylindrical portion 32 has a bottomed cylindrical shape, and an introduction port 32 a for introducing a gas to be detected from the off-gas flow path 10 is formed in the bottom portion. The cylindrical portion 32 is disposed in the offgas circulation pipe 11 so that the lower surface 32b does not protrude from the inner circumferential surface 11c of the offgas circulation pipe 11 and just contacts the inner circumferential surface 11c. A seal ring 35 is fitted on the outer peripheral surface 32 c of the cylindrical portion 32.
On the other hand, a cylindrical peripheral wall portion 33 is mounted on the inner peripheral surface side of the cylindrical portion 32, and a space surrounded by the peripheral wall portion 33 forms a gas detection chamber 31 for a gas to be detected. .
The introduction port 32 a is provided with a waterproof water-repellent filter 34 fitted in the peripheral wall portion 33, thereby preventing water droplets from entering the detection chamber 31.

以上のように構成されたガスセンサ１の作用について、図１および図３を参照して説明する。
オフガス流通管１１内をオフガス（被検出ガス）が流通すると、導入口３２ａから撥水フィルタ３４を通過して、検出部２までオフガスが浸入する。
したがって、通電部３は、保持板４から下側および上側に突出した部分がオフガスにさらされることになる。燃料電池から排出されるこのオフガスには、多量の水および水蒸気が含まれており、前記撥水フィルタ３４で大半は除去できるが、水蒸気化された水分は検知室３１まで浸入し結露して、通電部３の腐食または漏電を惹き起こすおそれがある。
そこで、本実施形態においては、保持板４の一方の面４ｃから下側に突出した通電部３の突出部分３ａをエポキシ樹脂５ａで封止するとともに、保持板４の他方の面４ｄから上側に突出した部分にあっては、保持板４の他方の面４ｄと保持板４の被取付面（回路基板２２の下面２２ａ）の間の部分をエポキシ樹脂５ｂで封止して、通電部３とオフガスとの接触を阻止して、通電部３をオフガスから完全に遮断している。
このように、通電部３をオフガス（被検出ガス）から遮断すれば、燃料電池から排出されるオフガスのように多量の水および水蒸気が含まれている場合であっても、通電部３の腐食または漏電を防止して、安定した感度を継続して保持することができ、信頼性が高く、寿命の長いガスセンサを得ることができる。 The operation of the gas sensor 1 configured as described above will be described with reference to FIGS. 1 and 3.
When off-gas (detected gas) flows through the off-gas circulation pipe 11, the off-gas enters the detection unit 2 from the introduction port 32 a through the water repellent filter 34.
Accordingly, the current-carrying part 3 is exposed to the off gas at portions protruding downward and upward from the holding plate 4. This off-gas discharged from the fuel cell contains a large amount of water and water vapor, and most of it can be removed by the water repellent filter 34, but the water vaporized enters the detection chamber 31 and is condensed. There is a risk of causing corrosion or leakage of the current-carrying part 3.
Therefore, in the present embodiment, the protruding portion 3a of the energizing portion 3 protruding downward from the one surface 4c of the holding plate 4 is sealed with the epoxy resin 5a, and upward from the other surface 4d of the holding plate 4. In the protruding portion, the portion between the other surface 4d of the holding plate 4 and the mounting surface of the holding plate 4 (the lower surface 22a of the circuit board 22) is sealed with an epoxy resin 5b, The contact with the off gas is prevented, and the energization unit 3 is completely cut off from the off gas.
In this way, if the energization unit 3 is cut off from the off gas (detected gas), the energization unit 3 is corroded even when a large amount of water and water vapor are contained as in the off gas discharged from the fuel cell. Alternatively, it is possible to prevent leakage and continuously maintain a stable sensitivity, and to obtain a gas sensor with high reliability and a long lifetime.

続いて、本発明の変形例について説明する。
図５は、本発明の変形例に係る保持板の上側の構成を説明するための斜視図である。図５に示すように、保持板４の上面には、保持板４を貫通するピン状の通電部３が突出している。そして、この通電部３の周囲を取り囲むようにして、絶縁部材としてのエポキシ樹脂５ｂがリング状に塗布されている。
一方、保持板の上側には、前記実施形態と同様に、保持板４の上面４ｄに対面して、保持板４の被取付面である回路基板２２の下面２２ａが配置される。そして、保持板４の上面４ｄと回路基板２２の下面２２ａとがエポキシ樹脂５ｂを介して密着して固定することで、通電部３を封止することができる。
このように、通電部３の周囲を取り囲むように絶縁部材５を配設しても、通電部３とオフガスとを遮断することができる。要するに、通電部３がオフガスから遮断されるように通電部３を封止する構造であればよい。 Then, the modification of this invention is demonstrated.
FIG. 5 is a perspective view for explaining the configuration of the upper side of the holding plate according to the modification of the present invention. As shown in FIG. 5, a pin-shaped energization portion 3 that penetrates the holding plate 4 protrudes from the upper surface of the holding plate 4. And the epoxy resin 5b as an insulating member is apply | coated to the ring shape so that the circumference | surroundings of this electricity supply part 3 may be surrounded.
On the other hand, on the upper side of the holding plate, the lower surface 22a of the circuit board 22, which is the mounting surface of the holding plate 4, is arranged facing the upper surface 4d of the holding plate 4 in the same manner as in the above embodiment. And the electricity supply part 3 can be sealed because the upper surface 4d of the holding | maintenance board 4 and the lower surface 22a of the circuit board 22 contact | adhere and fix via the epoxy resin 5b.
Thus, even if the insulating member 5 is disposed so as to surround the current-carrying part 3, the current-carrying part 3 and off-gas can be shut off. In short, any structure may be used as long as the energization unit 3 is sealed so that the energization unit 3 is shielded from off-gas.

以上、本発明の実施形態について説明したが、本発明は前記した実施形態に限定されず、適宜変更して実施することが可能である。
例えば、本実施形態においては、ガスセンサの通電部をリング状に形成された保持板に貫通させて構成したが、これに限定されるものではなく、保持板を設けなくともよいし、保持板はリング状のものに限定されることもない。
また、本発明の実施形態では、水素ガス濃度を検出するガスセンサを示したが、本発明はこれに限定されるものではなく、ＮＯX，ＳＯX、硫化水素、一酸化炭素などであってもよい。また、本実施形態では、検出部と回路部が近接（一体）となっているが、検出部と回路部が分離され、検出部と回路部とを絶縁ケーブルで接続する構成であってもよい。 Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be implemented with appropriate modifications.
For example, in the present embodiment, the energization part of the gas sensor is configured to penetrate the holding plate formed in a ring shape, but the present invention is not limited to this, and the holding plate may not be provided. It is not limited to the ring shape.
Further, in the embodiment of the present invention, the gas sensor for detecting the hydrogen gas concentration is shown, but the present invention is not limited to this, and it may be NO x , SO x , hydrogen sulfide, carbon monoxide and the like. Good. In the present embodiment, the detection unit and the circuit unit are close (integral), but the detection unit and the circuit unit may be separated and the detection unit and the circuit unit may be connected by an insulated cable. .

本発明の実施形態に係るガスセンサの取付状態を示す断面図である。It is sectional drawing which shows the attachment state of the gas sensor which concerns on embodiment of this invention. 本発明の実施形態に係るガスセンサの取付状態を示す側面図である。It is a side view which shows the attachment state of the gas sensor which concerns on embodiment of this invention. 本発明の実施形態に係るガスセンサの通電部の封止構造を示す図１の部分拡大断面図である。It is the elements on larger scale of FIG. 1 which shows the sealing structure of the electricity supply part of the gas sensor which concerns on embodiment of this invention. 本発明の実施形態に係るガスセンサの検出部を模式的に示す図１の部分拡大図である。It is the elements on larger scale of Drawing 1 showing typically a detection part of a gas sensor concerning an embodiment of the present invention. 本発明の変形例に係る保持板の上側の構成を説明するための斜視図である。It is a perspective view for demonstrating the structure of the upper side of the holding plate which concerns on the modification of this invention.

符号の説明Explanation of symbols

１ ガスセンサ
２ 検出部
２ａ 検出素子
２ｂ 補償素子
３ 通電部
４ 保持板
５ 封止材
１１ オフガス流通管
１１ａ 取付座
１１ｂ 貫通孔
２０ 回路部
２１ ケース
２２ 回路基板
２２ａ 下面（保持板の被取付面）
２３ 取付ボルト
３０ ガス導入部
３１ ガス検知室
３２ 筒状部
３３ 周壁部
３４ 撥水フィルタ
３５ シールリング DESCRIPTION OF SYMBOLS 1 Gas sensor 2 Detection part 2a Detection element 2b Compensation element 3 Current supply part 4 Holding plate 5 Sealing material 11 Off-gas flow pipe 11a Mounting seat 11b Through hole 20 Circuit part 21 Case 22 Circuit board 22a Lower surface (surface to which the holding plate is attached)
23 mounting bolt 30 gas introduction part 31 gas detection chamber 32 cylindrical part 33 peripheral wall part 34 water repellent filter 35 seal ring

Claims (1)

被検出ガス内に設置され、前記被検出ガスを検出する検出部と、
前記検出部からの出力を処理する回路基板からなる回路部と前記検出部とを電気的に接続するための通電部と、前記通電部を封止する絶縁部材と、を有する固体高分子膜型燃料電池による発電システムに使用されるガスセンサであって、
前記絶縁部材は、エポキシ系樹脂からなり、
前記通電部は、保持板を貫通したピン状に形成され、
前記検出部は、前記保持板の一方の面側において前記通電部に接続され、
前記保持板の他方の面は、前記保持板の被取付面である前記回路基板に対面し、前記通電部が当該回路基板の裏側まで貫通して当該回路基板の裏側面に接続され、
前記他方の面と前記被取付面の間の部分において、前記通電部の周囲が前記絶縁部材で封止されるとともに、
前記一方の面側から突出した前記通電部の突出部分の全体が完全に、前記被検出ガスとの接触を阻止するように前記絶縁部材で封止されたことを特徴とする固体高分子膜型燃料電池による発電システムに使用されるガスセンサ。 A detector that is installed in the gas to be detected and detects the gas to be detected;
A solid polymer membrane type comprising: a current-carrying part for electrically connecting a circuit part made of a circuit board for processing the output from the detection part and the detection part; and an insulating member for sealing the current-carrying part A gas sensor used in a power generation system using a fuel cell ,
The insulating member is made of epoxy resin,
The energization part is formed in a pin shape penetrating the holding plate,
The detection unit is connected to the energization unit on one surface side of the holding plate,
The other surface of the holding plate faces the circuit board , which is a mounting surface of the holding plate, and the energization portion penetrates to the back side of the circuit board and is connected to the back side surface of the circuit board.
In the portion between the other surface and the mounting surface, the periphery of the energizing portion is sealed with the insulating member,
The solid polymer membrane type characterized in that the whole projecting portion of the energizing part projecting from the one surface side is completely sealed with the insulating member so as to prevent contact with the gas to be detected Gas sensor used in fuel cell power generation systems .
JP2004346822A 2004-11-30 2004-11-30 Gas sensor Expired - Fee Related JP4430520B2 (en)

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