JPH0251138B2 - - Google Patents
Info
- Publication number
- JPH0251138B2 JPH0251138B2 JP58187709A JP18770983A JPH0251138B2 JP H0251138 B2 JPH0251138 B2 JP H0251138B2 JP 58187709 A JP58187709 A JP 58187709A JP 18770983 A JP18770983 A JP 18770983A JP H0251138 B2 JPH0251138 B2 JP H0251138B2
- Authority
- JP
- Japan
- Prior art keywords
- sintered body
- gas
- metal pipe
- metal
- particles
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000002184 metal Substances 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 239000002923 metal particle Substances 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 2
- 229910000906 Bronze Inorganic materials 0.000 description 8
- 239000010974 bronze Substances 0.000 description 8
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 8
- 238000001514 detection method Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical group [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000004880 explosion Methods 0.000 description 3
- 238000007084 catalytic combustion reaction Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
- G01N27/16—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by burning or catalytic oxidation of surrounding material to be tested, e.g. of gas
Description
【発明の詳細な説明】
この発明は、接触燃焼式または半導体式等の加
熱部を有するガスセンサのガス通気部分の金属焼
結体を極小型化したガスセンサ用フレームアレス
タの製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a flame arrester for a gas sensor in which a metal sintered body of a gas ventilation portion of a gas sensor having a heating section of a catalytic combustion type or a semiconductor type is miniaturized.
従来、可燃性ガス雰囲気中で使用する接触燃焼
式または半導体式等の加熱部を有するガスセンサ
においては、可燃性雰囲気ガスの濃度が薄い時は
火炎が生じることもなく安全であるが、可燃性雰
囲気ガスの濃度が高まり、爆発範囲のガスになつ
たとき、検知素子のヒータで着火し、爆発して火
炎が発生する。このとき爆発の火炎逸走を阻止す
るために、ガスセンサの周囲を青銅粒子等の焼結
体で被い、可燃性雰囲気ガスは青銅粒子等の焼結
体間隙から拡散浸透し検知素子に到達していた。 Conventionally, gas sensors with catalytic combustion type or semiconductor type heating parts that are used in flammable gas atmospheres are safe because they do not generate flames when the concentration of flammable gas is low; When the concentration of the gas increases and it reaches the explosive range, it is ignited by the heater in the detection element, causing an explosion and a flame. At this time, in order to prevent the explosion flame from escaping, the gas sensor is surrounded by a sintered body such as bronze particles, and the flammable atmospheric gas diffuses through the gaps between the sintered bodies such as bronze particles and reaches the detection element. Ta.
すなわち、従来例を示すと、第１図のごとく、
ガス検知素子１は２本の支柱２の間に支えられ、
その周囲を有底円筒状の青銅粒子焼結体（以下単
に焼結体という）８で被われ、焼結体８と円筒状
銅製の胴体９とは同時成形で結合されていた。３
は前記支柱２に接続されているリード線、４は前
記支柱２、リード線３を固定する基台であり、１
０はエポキシ樹脂である。この場合、焼結体８の
内容積はガス検知素子１の大きさによつて限定さ
れ、焼結体８の肉厚も焼結体構造の機械的強度を
保つためには約２ｍ／ｍ以上の厚さを必要とし、
焼結体８を含めたガスセンサ全体の形状は最小10
ｍ／ｍφ×20ｍ／ｍ位で極小型化することができ
ない欠点があつた。また、青銅粒子を有底円筒状
に、しかも胴体９と同時成形するのは手数がかか
り、量産化が困難で、コスト高になる欠点があつ
た。 In other words, in the conventional example, as shown in Fig. 1,
The gas detection element 1 is supported between two pillars 2,
The periphery thereof was covered with a bottomed cylindrical bronze particle sintered body (hereinafter simply referred to as sintered body) 8, and the sintered body 8 and the cylindrical copper body 9 were joined by simultaneous molding. 3
1 is a lead wire connected to the support 2; 4 is a base for fixing the support 2 and the lead wire 3;
0 is epoxy resin. In this case, the internal volume of the sintered body 8 is limited by the size of the gas sensing element 1, and the wall thickness of the sintered body 8 must be approximately 2 m/m or more in order to maintain the mechanical strength of the sintered body structure. requires a thickness of
The overall shape of the gas sensor including the sintered body 8 is at least 10
There was a drawback that it could not be miniaturized at about m/mφ×20 m/m. Furthermore, molding the bronze particles into a bottomed cylindrical shape at the same time as the body 9 is time consuming and difficult to mass produce, resulting in high costs.
この発明は、上記の欠点を解消するためになさ
れたものである。以下この発明について説明す
る。 This invention was made in order to eliminate the above-mentioned drawbacks. This invention will be explained below.
第２図はこの発明の一実施例を示す側断面図
で、１がガス検知素子、２は前記ガス検知素子１
の支柱、３は前記支柱２に接続されているリード
線、４は前記支柱２、リード線３を固定する基
台、５は前記ガス検知素子１のフレームアレス
タ、６は前記フレームアレスタ５を形成する金属
パイプで、主として銅等金属材料が使用されてい
る。７は前記金属パイプ６の一端６ａの内面に融
着により形成された青銅等の金属粒子による焼結
体で、通気性を有するように焼結したものであ
る。また、金属パイプ６の他端６ｂは基台４と着
脱可能に装着している。 FIG. 2 is a side sectional view showing one embodiment of the present invention, in which 1 is a gas detection element, and 2 is the gas detection element 1.
3 is a lead wire connected to the pillar 2, 4 is a base for fixing the pillar 2 and the lead wire 3, 5 is a flame arrester of the gas detection element 1, and 6 is the flame arrester 5. This is a metal pipe mainly made of metal materials such as copper. 7 is a sintered body of metal particles such as bronze formed by fusion on the inner surface of one end 6a of the metal pipe 6, and is sintered to have air permeability. Further, the other end 6b of the metal pipe 6 is detachably attached to the base 4.
次に、この発明のフレームアレスタ５の製造方
法について説明する。 Next, a method for manufacturing the flame arrester 5 of the present invention will be described.
まず、金属パイプ６の一端６ａを下にして所定
量の青銅等の金属粒子を充填する。金属粒子の粒
度は−18＋30メツシユ（網目の大きさ約0.9mm平
方が通り約0.55mm平方が通らない）である。次い
で充填された金属粒子を軽く押圧して所定の厚さ
に圧縮成形した後、約900℃で約３時間加熱して
焼結体７を形成すると同時に、加熱により金属粒
子を金属パイプ６の内面に融着させて焼結体７と
金属パイプ６とを一体に成形する。なお、上記実
施例での金属パイプ６は0.3mm厚の鋼板であるが、
可燃性ガスの種類、センサの種類、大きさにより
種々変更されるものである。焼結体７の厚さも実
施例では約1.5mm程度としたが、可燃性ガスの種
類、センサの種類、大きさにより種々変更される
ものである。金属パイプ６の直径も実施例では約
６mmであるが約３mmまで縮小可能である。 First, a predetermined amount of metal particles such as bronze are filled into the metal pipe 6 with one end 6a facing down. The particle size of the metal particles is -18+30 mesh (a mesh size of approximately 0.9 mm square passes through and approximately 0.55 mm square does not pass through). Next, the filled metal particles are pressed lightly to compression mold to a predetermined thickness, and then heated at about 900°C for about 3 hours to form a sintered body 7. At the same time, the metal particles are heated to form the inner surface of the metal pipe 6. The sintered body 7 and the metal pipe 6 are integrally formed by fusion bonding. Note that the metal pipe 6 in the above embodiment is a steel plate with a thickness of 0.3 mm,
Various changes may be made depending on the type of combustible gas, the type and size of the sensor. Although the thickness of the sintered body 7 was set to about 1.5 mm in the embodiment, it can be varied depending on the type of combustible gas, the type and size of the sensor. The diameter of the metal pipe 6 is also about 6 mm in the embodiment, but it can be reduced to about 3 mm.
また、実施例では金属パイプ６に銅を、焼結体
７の金属粒子に青銅粒子を使用したが、金属パイ
プ６にステンレスを、焼結体７の金属粒子にステ
ンレス粒子を使用することも可能で、この場合、
加熱温度は約1200℃、加熱時間は約３時間であ
る。 Further, in the embodiment, copper was used for the metal pipe 6 and bronze particles were used for the metal particles of the sintered body 7, but it is also possible to use stainless steel for the metal pipe 6 and stainless steel particles for the metal particles of the sintered body 7. And in this case,
The heating temperature is about 1200°C and the heating time is about 3 hours.
このようにして形成されたフレームアレスタ５
は可燃性雰囲気ガス中で焼結体７の金属粒子の間
隙から拡散、浸透し、内部のガス検知素子１に到
達する。次いで、フレームアレスタ５内の可燃性
雰囲気ガスの濃度が高まり爆発範囲の濃度になつ
たとき、ガス検知素子１のヒータにより爆発する
が、焼結体７により火焔が外へ出るのを防止す
る。 Flame arrester 5 formed in this way
diffuses and permeates through the gaps between the metal particles of the sintered body 7 in the flammable atmospheric gas, and reaches the gas sensing element 1 inside. Next, when the concentration of the flammable atmospheric gas in the flame arrester 5 increases and reaches the explosive range, an explosion occurs due to the heater of the gas detection element 1, but the sintered body 7 prevents the flame from escaping.
第３図はこの発明の他の実施例を示すもので、
金属パイプ６の先端をあらかじめ内方に曲げて折
曲げ部６ｃを作つておき、焼結体７の固着がより
強固に行われるようにしたものである。 FIG. 3 shows another embodiment of this invention,
The tip of the metal pipe 6 is bent inward in advance to form a bent portion 6c, so that the sintered body 7 can be more firmly fixed.
以上説明したようにこの発明は、フレームアレ
スタの周囲部分に金属パイプを使用し、ガス拡
散、浸透する部分をこの金属パイプの一端に、金
属粒子からなる焼結体を使用して設け、焼結体の
焼成時に金属パイプとの融着を同時に行うように
したので、従来と比較して極小のフレームアレス
タの製作が可能であり、フレームアレスタとして
の機械的強度が高く、信頼性の高いものが得られ
る。また、製造工程が簡単なので量産化が可能で
あり、製造コストが格段に節減できる等の利点を
有する。 As explained above, the present invention uses a metal pipe around the flame arrester, and provides a gas diffusion and permeation part at one end of the metal pipe using a sintered body made of metal particles. Since the body is fused to the metal pipe at the same time as the body is fired, it is possible to manufacture a flame arrester that is extremely small compared to conventional flame arresters, and has high mechanical strength and reliability. can get. Furthermore, since the manufacturing process is simple, mass production is possible, and manufacturing costs can be significantly reduced.
第１図は従来のガスセンサ用フレームアレスタ
の一例を示す側断面図、第２図はこの発明の一実
施例を示す側断面図、第３図はこの発明の他の実
施例を示す側断面図である。
図中、１はガス検知素子、２は支柱、３はリー
ド線、４は基台、５はフレームアレスタ、６は金
属パイプ、６ａは金属パイプの一端、６ｂは同じ
く他端、６ｃは折曲げ部、７は焼結体、８は青銅
粒子焼結体、９は銅体、１０はエポキシ樹脂であ
る。
FIG. 1 is a side sectional view showing an example of a conventional flame arrester for a gas sensor, FIG. 2 is a side sectional view showing one embodiment of the present invention, and FIG. 3 is a side sectional view showing another embodiment of the present invention. It is. In the figure, 1 is a gas detection element, 2 is a support, 3 is a lead wire, 4 is a base, 5 is a flame arrester, 6 is a metal pipe, 6a is one end of the metal pipe, 6b is the other end, and 6c is a bent part. 7 is a sintered body, 8 is a bronze particle sintered body, 9 is a copper body, and 10 is an epoxy resin.
Claims (1)
開口部内に金属粒子を充填し、次いで、前記充填
された金属粒子を所定厚さに圧縮成形した後加熱
して焼結体を形成すると同時にこの焼結体を前記
金属パイプの内面に融着させることを特徴とする
ガスセンサ用フレームアレスタの製造方法。1 The opening at one end of the metal pipe in which the gas sensor is housed is filled with metal particles, and then the filled metal particles are compression-molded to a predetermined thickness and then heated to form a sintered body. A method for manufacturing a flame arrester for a gas sensor, characterized in that the body is fused to the inner surface of the metal pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18770983A JPS6080749A (en) | 1983-10-08 | 1983-10-08 | Preparation of flame arrestor for gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18770983A JPS6080749A (en) | 1983-10-08 | 1983-10-08 | Preparation of flame arrestor for gas sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6080749A JPS6080749A (en) | 1985-05-08 |
| JPH0251138B2 true JPH0251138B2 (en) | 1990-11-06 |
Family
ID=16210793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18770983A Granted JPS6080749A (en) | 1983-10-08 | 1983-10-08 | Preparation of flame arrestor for gas sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6080749A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0764847B1 (en) * | 1995-09-20 | 2002-07-31 | Siemens Building Technologies AG | Gas sensor |
| GB2328508B (en) * | 1997-08-18 | 2002-02-13 | Zellweger Analytics Ltd | Housing for a flammable gas detector |
| US6715360B1 (en) | 2003-02-19 | 2004-04-06 | Fisher Controls International, Llc | Gauge pressure sensor for hazardous applications |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51151193A (en) * | 1975-06-20 | 1976-12-25 | C-Hoo Beririumu Switch Kogyo Kk | Gas detector |
-
1983
- 1983-10-08 JP JP18770983A patent/JPS6080749A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51151193A (en) * | 1975-06-20 | 1976-12-25 | C-Hoo Beririumu Switch Kogyo Kk | Gas detector |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6080749A (en) | 1985-05-08 |
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