JP2007155639A - Explosion proof type gas sensor device - Google Patents
Explosion proof type gas sensor device Download PDFInfo
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本発明は、例えば金属焼結体が用いられて防爆構造が構成されてなる防爆型ガスセンサー装置に関するものである。 The present invention relates to an explosion-proof gas sensor device in which an explosion-proof structure is configured using, for example, a metal sintered body.
可燃性のガスや蒸気を含む爆発性雰囲気の存在により、引火、爆発が発生し得る環境で使用されるガスセンサー装置においては、所定の防爆性を有する防爆構造を具備していることが要求されている。 Gas sensor devices used in environments where flammable or explosive atmospheres may occur due to the presence of explosive atmospheres containing flammable gases and vapors are required to have an explosion-proof structure with a predetermined explosion-proof property. ing.
例えば、赤外線が検知対象ガスによって吸収されることによる赤外線量の減衰の程度に応じてガス濃度を測定する、非分散型赤外線吸収法を利用した赤外線センサーにおいては、原理上、測定するガスの濃度に応じて十分な吸収を得るための相応の光路長（吸収長）を確保することが要求されることから、一般的に、例えばガス導入口を有する円筒形状のガスセルを備え、このガスセルの両端に赤外線光源と赤外線センサー素子が対向配置された構成とされている。
そして、このような赤外線センサーを具えたガスセンサー装置においては、ガスセルの外周に焼結金属よりなる防爆ケースがガス導入口を塞ぐよう装着されることにより、防爆構造を有するものとして構成されている（例えば特許文献１参照。）。
For example, in an infrared sensor using a non-dispersive infrared absorption method that measures gas concentration according to the degree of attenuation of the amount of infrared rays due to absorption of infrared rays by the detection target gas, in principle, the concentration of the gas to be measured In general, for example, a cylindrical gas cell having a gas inlet is provided, and both ends of the gas cell are provided. The infrared light source and the infrared sensor element are arranged to face each other.
And in the gas sensor device having such an infrared sensor, an explosion-proof case made of sintered metal is attached to the outer periphery of the gas cell so as to close the gas inlet, thereby having an explosion-proof structure. (For example, refer to Patent Document 1).
焼結金属は、機械的強度が小さくて耐久性が不十分であるものであるために、特許文献１に開示されているガスセンサー装置においては、当該防爆ケースの破損を保護するための保護枠が防爆ケースの外周を囲うよう設けられている。
この保護枠は、通常、ガスセンサー装置を作製する上で有利であることから、例えば螺合により装着されており、必要に応じてネジ止めされて固定される。
Since the sintered metal has low mechanical strength and insufficient durability, in the gas sensor device disclosed in Patent Document 1, a protective frame for protecting the explosion-proof case from damage. Is provided to surround the outer periphery of the explosion-proof case.
Since this protective frame is usually advantageous in producing a gas sensor device, it is attached, for example, by screwing, and is fixed by screwing as necessary.
而して、このようなガスセンサー装置が防爆構造を有するものであると認められるためには、ガスセンサー装置が設置された状態にあるときに取り外すことが可能となる構成部材や部品が取り外された状態で所定の耐久性や防炎性能のテストに合格することが必要とされている。
従って、上記ガスセンサー装置のように、例えば保護枠が単なる螺合によって装着されている構成のものにおいては、当該保護枠を取り外すことが可能であるから、保護枠が取り外されて焼結金属製の防爆ケースが露出された状態で上記テストが行われることになり、ガスセンサー装置を十分な防爆性を有するものとして構成することができない、という問題がある。
また、保護枠がネジ止めされて固定された構成のものについても同様に、固定用ネジは、保護枠がセンサー本体に取り付けられた状態において、外部から装着されるため、ガスセンサー装置が設置された状態において、工具の挿入が可能な状態とされており、結局、保護枠が取り外された状態で上記テストが行われることになる。
Therefore, as in the gas sensor device described above, for example, in a configuration in which the protective frame is attached by simple screwing, the protective frame can be removed. The above test is performed in a state where the explosion-proof case is exposed, and there is a problem that the gas sensor device cannot be configured to have sufficient explosion-proof properties.
Similarly, for the configuration in which the protective frame is fixed by screwing, the fixing screw is attached from the outside in a state where the protective frame is attached to the sensor body, so that the gas sensor device is installed. In this state, the tool can be inserted, and eventually the test is performed with the protective frame removed.
本発明は、以上のような事情に基づいてなされたものであって、信頼性の高い防爆性が得られる新規な構造の防爆型ガスセンサー装置を提供することを目的とする。 The present invention has been made based on the above circumstances, and an object of the present invention is to provide an explosion-proof gas sensor device having a novel structure capable of obtaining a highly reliable explosion-proof property.
本発明の防爆型ガスセンサー装置は、全体が略円筒状のガスセンサー本体およびこのガスセンサー本体の一端部に装着されたベース部材によって保持されて当該ガスセンサー本体の周囲を囲むよう配置された、通気性を有する円筒状の焼結金属製のフレームアレスタよりなるセンサーユニットと、フレームアレスタの周囲を囲むよう前記ベース部材に螺合されて装着された略有底円筒状のガード部材とを具えてなる防爆型ガスセンサー装置であって、
互いに固定用ネジにより固定されてガード部材の一端部およびベース部材を挟持して保持する一対の保持部材が装着されており、
固定用ネジは、当該防爆型ガスセンサー装置が設置された状態にあるときに、頭部が外部に露出されない状態とされることを特徴とする。
The explosion-proof gas sensor device of the present invention is arranged so as to be surrounded by a substantially cylindrical gas sensor body and a base member attached to one end of the gas sensor body so as to surround the gas sensor body. A sensor unit composed of a cylindrical sintered metal frame arrester having air permeability, and a substantially bottomed cylindrical guard member screwed onto the base member so as to surround the frame arrester. An explosion-proof gas sensor device,
A pair of holding members that are fixed to each other by a fixing screw and sandwich and hold one end of the guard member and the base member are mounted,
The fixing screw is characterized in that the head is not exposed to the outside when the explosion-proof gas sensor device is installed.
本発明の防爆型ガスセンサー装置においては、ベース部材は、ガード部材が装着される円筒状の装着部と、この装着部より外径が大きいフランジ部を介して連続する、ガスセンサー装置全体を設置するための螺合装着部とにより構成されており、
開口を有する一方の保持部材が当該開口内を螺合装着部が挿通された状態で装着されていると共に、開口を有し、当該開口の開口縁に内方に突出する突出縁部分が形成された他方の保持部材が当該開口内をガード部材が挿通された状態で装着されて、一方の保持部材の背面側から装着された固定用ネジによって互いに固定されており、
一方の保持部材における開口縁部分および他方の保持部材における突出縁部分によって、ベース部材のフランジ部分およびガード部材の鍔部分が挟持されて保持された構成とすることができる。
In the explosion-proof gas sensor device of the present invention, the base member is installed with the entire gas sensor device continuous via a cylindrical mounting portion to which the guard member is mounted and a flange portion having a larger outer diameter than the mounting portion. And a threaded mounting portion for
One holding member having an opening is mounted in a state where the threaded mounting portion is inserted through the opening, and a protruding edge portion that has an opening and protrudes inwardly is formed on the opening edge of the opening. The other holding member is attached in a state where the guard member is inserted through the opening, and is fixed to each other by a fixing screw attached from the back side of the one holding member,
The flange portion of the base member and the flange portion of the guard member can be sandwiched and held by the opening edge portion of one holding member and the protruding edge portion of the other holding member.
また、本発明の防爆型ガスセンサー装置においては、一方の保持部材には、当該防爆型ガスセンサー装置の姿勢固定用のストッパネジがその頭部が外部に露出する状態で厚み方向に貫通して設けられた構成とされていることが好ましい。 In the explosion-proof gas sensor device of the present invention, one holding member is provided with a stopper screw for fixing the posture of the explosion-proof gas sensor device in the thickness direction with its head exposed to the outside. It is preferable that it is set as the structure comprised.
本発明の防爆型ガスセンサー装置によれば、金属焼結体よりなるフレームアレスタがガスセンサー本体を囲うよう装着されていると共に当該フレームアレスタを保護するガード部材が、当該防爆型ガスセンサー装置が設置された状態にあるときに取り外すことが不可能とされた状態で装着されていることにより、フレームアレスタが破損して所期の防爆性が損なわれることがなく、ガスセンサー装置を十分に信頼性の高い防爆性を有するものとして構成することができる。
しかも、ガード部材を溶接などにより接合することなしに、取り外し不可の状態とすることができるので、簡単な構成でありながら、十分に信頼性の高い防爆構造を提供することができる。
According to the explosion-proof gas sensor device of the present invention, a flame arrester made of a sintered metal body is mounted so as to surround the gas sensor body, and a guard member for protecting the flame arrester is installed in the explosion-proof gas sensor device. When installed in a state where it cannot be removed, the flame arrestor will not be damaged and the desired explosion-proof performance will not be impaired, and the gas sensor device will be sufficiently reliable. It can be configured as having a high explosion-proof property.
In addition, since the guard member can be brought into a non-removable state without being joined by welding or the like, a sufficiently reliable explosion-proof structure can be provided with a simple configuration.
以下、本発明について図面を参照しながら詳細に説明する。
図１は、本発明の防爆型ガスセンサー装置の一例における構成の概略を示す断面図、図２は、図１に示す防爆型ガスセンサー装置の分解図である。
この防爆型ガスセンサー装置１０は、全体が略円筒状のガスセンサー本体２０およびこのガスセンサー本体２０の一端部に装着されたベース部材１３によって保持されてガスセンサー本体２０の周囲を囲むよう配置されたフレームアレスタ１２よりなるセンサーユニット１１と、フレームアレスタ１２の周囲を囲むようベース部材１３に螺合されて装着されたガード部材３０とを具えている。
Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view schematically showing a configuration of an example of an explosion-proof gas sensor device according to the present invention, and FIG. 2 is an exploded view of the explosion-proof gas sensor device shown in FIG.
The explosion-proof gas sensor device 10 is disposed so as to surround the periphery of the gas sensor body 20 by being held by a generally cylindrical gas sensor body 20 and a base member 13 attached to one end of the gas sensor body 20. The sensor unit 11 includes a frame arrester 12 and a guard member 30 that is screwed onto the base member 13 so as to surround the frame arrester 12.
ガスセンサー本体２０は、被検ガスが導入される例えばステンレス鋼よりなる円筒状のガスセル２１を備え、このガスセル２１の一端部に、赤外線センサー素子２３が設けられていると共に、ガスセル２１の他端部に、点滅駆動される赤外線光源２２が設けられて、構成されている。
ガスセル２１には、その両側面の軸方向に並んだ位置に、周壁を貫通する複数のガス流入口２１Ａが形成されている。
図１において、２５は光源駆動用プリント基板、２６はセンサー基板、２７はリード線である。
The gas sensor main body 20 includes a cylindrical gas cell 21 made of, for example, stainless steel into which a test gas is introduced. An infrared sensor element 23 is provided at one end of the gas cell 21 and the other end of the gas cell 21. An infrared light source 22 that is driven to blink is provided in the unit.
The gas cell 21 is formed with a plurality of gas inlets 21 </ b> A penetrating the peripheral wall at positions aligned in the axial direction on both side surfaces thereof.
In FIG. 1, 25 is a light source driving printed circuit board, 26 is a sensor board, and 27 is a lead wire.
ガスセル２１の一端部には、筒状のキャップ部材２８が装着されており、更にスリーブ部材２９がキャップ部材２８の一端部に嵌合されて一体に装着されている。
キャップ部材２８およびスリーブ部材２９の内部空間には、例えばエポキシ樹脂などの絶縁性樹脂１７が充填されて封止されており、この絶縁性樹脂１７によるガスセル２１内に導入されるガスの隔離機能およびフレームアレスタ１２による火炎伝播阻止機能によってガスセンサー装置が防爆構造を有するものとして構成されている。ここに、絶縁性樹脂１７としては、例えば耐熱温度が１２０℃以上の熱安定性を有するものが用いられている。
A cylindrical cap member 28 is attached to one end portion of the gas cell 21, and a sleeve member 29 is fitted to one end portion of the cap member 28 and attached integrally.
The internal space of the cap member 28 and the sleeve member 29 is filled and sealed with an insulating resin 17 such as an epoxy resin, for example, and the function of isolating the gas introduced into the gas cell 21 by the insulating resin 17 and The gas sensor device is configured to have an explosion-proof structure by the flame propagation preventing function by the flame arrestor 12. Here, as the insulating resin 17, for example, a resin having a heat stability of a heat resistant temperature of 120 ° C. or higher is used.
ベース部材１３は、ガード部材３０が螺合により装着される円筒状のガード部材装着部１４と、正面形状が六角形とされたフランジ部１５を介してガード部材装着部１４に連続して軸方向外方に延出する、防爆型ガスセンサー装置１０全体を設置するための円筒状の螺合装着部１６とにより構成されており、キャップ部材２８およびスリーブ部材２９が中央貫通孔に嵌合されることによりガスセンサー本体２０の一端部に装着されている。 The base member 13 is axially connected to the guard member mounting portion 14 through a cylindrical guard member mounting portion 14 to which the guard member 30 is mounted by screwing and a flange portion 15 having a hexagonal front shape. It is comprised by the cylindrical screwing mounting part 16 for installing the explosion-proof type gas sensor apparatus 10 whole extended outward, and the cap member 28 and the sleeve member 29 are fitted by the center through-hole. Accordingly, the gas sensor body 20 is attached to one end portion.
フレームアレスタ１２は、通気性を有する有底円筒状の焼結金属体よりなり、開口側端部がベース部材１３によって保持されている。
フレームアレスタ１２を構成する金属焼結体の仕様の一例を示すと、例えば厚みが３ｍｍ、密度が４．３９ｇ／ｃｃ、気孔サイズが１２１．０１μｍであり、このような構成のものであることにより、所期の火炎伝播阻止効果を確実に得ることができる。
The frame arrester 12 is formed of a bottomed cylindrical sintered metal body having air permeability, and an opening side end is held by the base member 13.
An example of the specification of the sintered metal constituting the frame arrester 12 is as follows. For example, the thickness is 3 mm, the density is 4.39 g / cc, and the pore size is 121.01 μm. The desired flame propagation preventing effect can be obtained with certainty.
この実施例においては、ベース部材１３およびフレームアレスタ１２は、いずれも、例えばステンレス鋼（ＳＵＳ３１６）よりなり、同時焼結によって一体に接合されている。これにより、内部爆発に耐えうる十分な接合強度が得られ、接合面の隙間から通じて火炎が外部へ着火することを確実に防止することができる。ここに、「同時焼結」とは、圧粉体である金属焼結体よりなるフレームアレスタ１２をベース部材１３に保持させた状態で焼結させると同時にベース部材１３に接合させることをいう。 In this embodiment, the base member 13 and the frame arrester 12 are both made of stainless steel (SUS316), for example, and are integrally joined by simultaneous sintering. Thereby, sufficient joining strength which can endure internal explosion is obtained, and it can prevent reliably that a flame ignites outside through the clearance gap of a joining surface. Here, “simultaneous sintering” means that the frame arrester 12 made of a metal sintered body, which is a green compact, is sintered while being held by the base member 13 and simultaneously joined to the base member 13.
ガード部材３０は、例えば鋳鋼（ＳＣＳ１３、ＳＵＳ３０４に相当）よりなり、一端が開口する全体が略有底円筒状のものであって、周壁部３１における一端側部分には、内部空間と連通するガス導入口３３が形成されている。
ガード部材３０の一端における外周面には、径方向外方に突出する鍔部分３４が周方向の全周にわたって形成されている。
３５は、ガード部材３０の底壁部３２に形成された校正用ガスを導入するための貫通孔である。
The guard member 30 is made of, for example, cast steel (corresponding to SCS13 and SUS304), and has a generally bottomed cylindrical shape whose one end is open. A gas communicating with the internal space is formed on one end side portion of the peripheral wall portion 31. An introduction port 33 is formed.
On the outer peripheral surface at one end of the guard member 30, a flange portion 34 protruding outward in the radial direction is formed over the entire circumference.
Reference numeral 35 denotes a through hole for introducing a calibration gas formed in the bottom wall portion 32 of the guard member 30.
この防爆型ガスセンサー装置１０においては、互いに固定されてガード部材３０の鍔部分３４およびベース部材１３を挟持して保持する一対の保持部材が装着されている。 In the explosion-proof gas sensor device 10, a pair of holding members that are fixed to each other and sandwich and hold the flange portion 34 of the guard member 30 and the base member 13 are mounted.
防爆型ガスセンサー装置１０の一端側に装着された一方の保持部材（以下、「背面側保持部材５０」という。）は、図３にも示すように、中央にベース部材１３における螺合装着部１６が挿入される正面形状が円形状の中央開口５１が形成された全体が略円板状のものであって、一面には、ベース部材１３におけるフランジ部１５と係合される係合部５２が形成されている。
係合部５２は、各々、ベース部材１３におけるフランジ部１５の例えば互いに対向する外周面部分に係合する平担な係合面５３Ａを有する半月状の一対の係合片５３により構成されており、各々の係合片５３は、係合面５３Ａが対向する状態で、垂直方向に伸びるよう形成されている。係合片５３の外方面は、ガード部材３０の鍔部分３４の外径寸法と同一の外径寸法を有する円柱体の周面に沿った形態とされている。
One holding member (hereinafter referred to as “rear-side holding member 50”) attached to one end of the explosion-proof gas sensor device 10 has a screwing attachment portion in the base member 13 at the center as shown in FIG. The center opening 51 having a circular front shape into which the 16 is inserted is formed in a substantially disk shape, and on one side, the engaging portion 52 that is engaged with the flange portion 15 in the base member 13 is formed. Is formed.
Each of the engaging portions 52 includes a pair of half-moon-like engaging pieces 53 each having a flat engaging surface 53A that engages, for example, the outer peripheral surface portions of the flange portion 15 of the base member 13 that face each other. Each engagement piece 53 is formed to extend in the vertical direction with the engagement surface 53A facing each other. The outer surface of the engagement piece 53 is configured along the circumferential surface of a cylindrical body having the same outer diameter as the outer diameter of the flange portion 34 of the guard member 30.
背面側保持部材５０の外周縁部分には、固定用ネジ６０が装着される固定用ネジ装着用孔５４が厚み方向に貫通して形成されており、固定用ネジ装着用孔５４の他面側開口部には、固定用ネジ６０の頭部が収容される凹所５６が形成されている。この例においては、固定用ネジ装着用孔５４は、例えば係合片５３の形成位置と同一の周方向位置において、係合片５３と径方向外方に離間した位置に２箇所形成されている。 A fixing screw mounting hole 54 to which the fixing screw 60 is mounted is formed through the outer peripheral edge portion of the back side holding member 50 in the thickness direction, and the other surface side of the fixing screw mounting hole 54 is formed. A recess 56 in which the head of the fixing screw 60 is accommodated is formed in the opening. In this example, the fixing screw mounting holes 54 are formed at two locations at positions spaced radially outward from the engagement piece 53 at, for example, the same circumferential position as the formation position of the engagement piece 53. .
この背面側保持部材５０は、カバー部材３０が装着されたセンサーユニット１１に対して、その中央開口５１にベース部材１３の螺合装着部１６が挿通されて外方に突出され、係合片５３の係合面５３Ａがベース部材１３の外周面部分に係合された状態で、装着されている。 The back-side holding member 50 is protruded outwardly by the threaded mounting portion 16 of the base member 13 being inserted into the central opening 51 of the sensor unit 11 to which the cover member 30 is mounted. The engagement surface 53 </ b> A is mounted in a state of being engaged with the outer peripheral surface portion of the base member 13.
防爆型ガスセンサー１０の他端側に装着された他方の保持部材（以下、「正面側保持部材４０」という。）は、図４にも示すように、板状の基材の中央位置に、ガード部材３０の鍔部分３４の外径寸法に適合する内径寸法を有する正面形状が円形状の中央開口４１が形成された略矩形枠状のものであって、中央開口４１の一面側開口縁には、径方向内方に突出する突出縁部分４２が周方向の全周にわたって形成されている。
この正面側保持部材４０の他面には、背面側保持部材５０と対接された状態において背面側保持部材５０における固定用ネジ装着用孔５４に対応する位置に、固定用ネジ装着用孔５４に連続して厚み方向に伸びる固定用ネジ装着用孔４４が形成されている。
また、止めネジ装着用貫通孔４５が外周面に径方向に貫通して伸びるよう例えば２箇所形成されている。
The other holding member (hereinafter referred to as “front side holding member 40”) mounted on the other end side of the explosion-proof gas sensor 10 is, as shown in FIG. The front shape having an inner diameter dimension that matches the outer diameter dimension of the flange portion 34 of the guard member 30 is a substantially rectangular frame shape in which a circular central opening 41 is formed. Has a protruding edge portion 42 protruding radially inward over the entire circumference in the circumferential direction.
On the other surface of the front side holding member 40, the fixing screw mounting hole 54 is located at a position corresponding to the fixing screw mounting hole 54 in the back side holding member 50 in a state of being in contact with the back side holding member 50. A fixing screw mounting hole 44 extending continuously in the thickness direction is formed.
Further, for example, two holes are formed so that the set screw mounting through holes 45 extend radially through the outer peripheral surface.
この正面側保持部材４０は、背面側保持部材５０が装着された状態において、中央開口４１内にカバー部材３０の鍔部分３４および背面側保持部材５０の係合片５３が受容されて突出縁部分４２の内面がカバー部材３０の鍔部分３４の他端面に係止されると共に、固定用ネジ装着用孔４４が背面側保持部材５０における固定用ネジ装着用孔５４と互いに位置合せされて背面側保持部材５０に対接された状態で、装着されている。 The front side holding member 40 has a protruding edge portion in which the flange portion 34 of the cover member 30 and the engagement piece 53 of the back side holding member 50 are received in the central opening 41 in a state where the rear side holding member 50 is mounted. The inner surface of 42 is locked to the other end surface of the flange portion 34 of the cover member 30, and the fixing screw mounting hole 44 is aligned with the fixing screw mounting hole 54 in the rear-side holding member 50, so It is mounted in a state of being in contact with the holding member 50.
そして、背面側保持部材５０および正面側保持部材４０は、背面側保持部材５０の背面側（他面側）から固定用ネジ６０がその頭部が凹所５６内に収容された状態で装着されることにより互いに固定されており、これにより、カバー部材３０の鍔部分３４およびベース部材１３のフランジ部１５が背面側保持部材５０および正面側保持部材４０によって挟持されて保持されて、ガード部材３０のセンサーユニット１１に対する螺合に係る回転が禁止された状態とされている。
また、正面側保持部材４０における止めネジ装着用孔４５には、止めネジ（図示せず）が装着されており、正面側保持部材４０がカバー部材３０に対して固定されている。
Then, the back-side holding member 50 and the front-side holding member 40 are mounted from the back side (the other side) of the back-side holding member 50 with the fixing screw 60 in a state where the head is housed in the recess 56. Accordingly, the flange portion 34 of the cover member 30 and the flange portion 15 of the base member 13 are sandwiched and held by the rear side holding member 50 and the front side holding member 40, whereby the guard member 30. The rotation related to the screwing with respect to the sensor unit 11 is prohibited.
Further, a set screw (not shown) is mounted in the set screw mounting hole 45 in the front side holding member 40, and the front side holding member 40 is fixed to the cover member 30.
上記構成の防爆型ガスセンサー装置１０は、図５に示すように、例えば垂直な壁面に設置されて用いられ、設置面Ｓに対して次のようにして装着される。
すなわち、防爆型ガスセンサー装置１０全体が所定の設置面Ｓに対して螺合により、カバー部材１３の周壁部３１に形成されたガス導入口３３が例えば正面から見て右方向に開口する適正な姿勢に調整された状態で装着され、更に、背面側保持部材５０における正面側保持部材４０の最外郭縁位置より径方向外方側において外部に露出される領域内に形成された、厚み方向に貫通して伸びるネジ装着用貫通孔５５に背面側保持部材５０の正面側（一面側）からストッパネジ６１が装着されることにより固定される。
この状態においては、背面側保持部材５０および正面側保持部材４０を互いに固定する固定用ネジ６０の頭部が外部に露出しない状態とされており、従って、固定用ネジ６０に対する工具の挿入が阻止されることによって背面側保持部材５０および正面側保持部材４０を取り外すことが不可能な状態とされる結果、ガード部材３０が取り外し不可能な状態とされている。
As shown in FIG. 5, the explosion-proof gas sensor device 10 having the above configuration is used by being installed on a vertical wall surface, for example, and attached to the installation surface S as follows.
In other words, the explosion-proof gas sensor device 10 as a whole is screwed into a predetermined installation surface S so that the gas introduction port 33 formed in the peripheral wall portion 31 of the cover member 13 is opened appropriately in the right direction when viewed from the front, for example. Mounted in a state adjusted to the posture, and further formed in a region exposed to the outside on the radially outer side from the outermost edge position of the front side holding member 40 in the rear side holding member 50 in the thickness direction. The stopper screw 61 is fixed to the through hole 55 for attaching the screw extending through the front side (one side) of the rear side holding member 50 by being attached.
In this state, the head of the fixing screw 60 that fixes the back-side holding member 50 and the front-side holding member 40 to each other is not exposed to the outside, and therefore, insertion of a tool into the fixing screw 60 is prevented. As a result, the back side holding member 50 and the front side holding member 40 cannot be removed. As a result, the guard member 30 cannot be removed.
上述したように、ガスセンサー装置が防爆構造を有するものとして認められるためには、ガスセンサー装置が設置された状態にあるときに取り外すことが可能となる構成部材および部品は、それらが取り外された状態で所定の耐久性や防炎性能のテストに合格することが必要とされる。 As described above, in order for the gas sensor device to be recognized as having an explosion-proof structure, the components and parts that can be removed when the gas sensor device is installed are removed. It is necessary to pass predetermined durability and flameproof performance tests in the state.
而して、上記構成の防爆型ガスセンサー装置１０によれば、ガード部材３０の鍔部分３４およびベース部材１３のフランジ部１５が互いに固定用ネジ６０により固定された背面側保持部材５０および正面側保持部材４０によって挟持されて保持されていることによりガード部材３０のセンサーユニット１１に対する螺合に係る回転が禁止されると共に、防爆型ガスセンサー装置１０が設置された状態にあるときに、固定用ネジ６０に対する工具の挿入が阻止されて背面側保持部材５０および正面側保持部材４０を取り外すことが不可能な状態が得られるので、ガード部材３０がセンサーユニット１１に対して取り外し不可能な状態とすることができる。従って、フレームアレスタ１２がガスセンサー本体２０を囲うよう装着されていると共にフレームアレスタ１２を保護するガード部材３０が取り外し不可能な状態で装着されていることにより、ガード部材３０が装着されたままの状態で上記テストが実施されることとなり、フレームアレスタ１２が破損して所期の防爆性能が損なわれることがないので、防爆型ガスセンサー装置１０を十分に信頼性の高い防爆性を有するものとして構成することができる。
しかも、ガード部材３０を溶接などにより接合することなしに、ガード部材３０を取り外すことが不可能な状態とすることができるので、簡単な構成により、十分に信頼性の高い防爆構造を提供することができる。
Thus, according to the explosion-proof gas sensor device 10 configured as described above, the rear side holding member 50 and the front side, in which the flange portion 34 of the guard member 30 and the flange portion 15 of the base member 13 are fixed to each other by the fixing screw 60. Since the rotation of the guard member 30 with respect to the sensor unit 11 is prohibited by being sandwiched and held by the holding member 40 and the explosion-proof gas sensor device 10 is installed, the fixing member is fixed. Since the insertion of the tool into the screw 60 is blocked and the rear side holding member 50 and the front side holding member 40 cannot be removed, the guard member 30 is not removable from the sensor unit 11. can do. Accordingly, the frame arrester 12 is mounted so as to surround the gas sensor body 20 and the guard member 30 that protects the frame arrester 12 is mounted in a non-removable state, so that the guard member 30 remains mounted. The above test is performed in a state, and the flame arrester 12 is not damaged and the intended explosion-proof performance is not impaired. Therefore, the explosion-proof gas sensor device 10 is assumed to have sufficiently reliable explosion-proof performance. Can be configured.
In addition, since the guard member 30 can be made in a state in which it cannot be removed without joining the guard member 30 by welding or the like, a sufficiently reliable explosion-proof structure can be provided with a simple configuration. Can do.
また、防爆型ガスセンサー装置１０全体がストッパネジ６１によって設置面Ｓに対して固定される構成とされていることにより、防爆型ガスセンサー装置１０をその螺合装着部１６に係る螺合の程度を調整して設置することができるので、防爆型ガスセンサー装置１０を適正な姿勢で設置することができる。 Further, since the entire explosion-proof gas sensor device 10 is configured to be fixed to the installation surface S by the stopper screw 61, the degree of screwing of the explosion-proof gas sensor device 10 with respect to the screw mounting portion 16 can be reduced. Since it can be adjusted and installed, the explosion-proof gas sensor device 10 can be installed in an appropriate posture.
また、フレームアレスタ１２が円筒状であり、ガード部材３０が円筒形態を有するものであることにより、フレームアレスタ１２およびガード部材３０を所定の位置に容易に装着することができ、所定の防爆型ガスセンサー１０を有利に作製することができる。 Further, since the frame arrester 12 is cylindrical and the guard member 30 has a cylindrical shape, the frame arrester 12 and the guard member 30 can be easily mounted at predetermined positions, and a predetermined explosion-proof gas. The sensor 10 can be advantageously made.
１０ 防爆型ガスセンサー装置
１１ センサーユニット
１２ フレームアレスタ
１３ ベース部材
１４ ガード部材装着部
１５ フランジ部
１６ 螺合装着部
１７ 絶縁性樹脂
２０ ガスセンサー本体
２１ ガスセル
２１Ａ ガス流入口
２２ 赤外線光源
２３ 赤外線センサー素子
２５ 光源駆動用プリント基板
２６ センサー基板
２７ リード線
２８ キャップ部材
２９ スリーブ部材
３０ ガード部材
３１ 周壁部
３２ 底壁部
３３ ガス導入口
３４ 鍔部分
３５ 貫通孔
４０ 正面側保持部材
４１ 中央開口
４２ 突出縁部分
４４ 固定用ネジ装着用孔
４５ 止めネジ装着用貫通孔
５０ 背面側保持部材
５１ 中央開口
５２ 係合部
５３ 係合片
５３Ａ 係合面
５４ 固定用ネジ装着用孔
５５ ネジ装着用貫通孔
５６ 凹所
Ｓ 設置面
６０ 固定用ネジ
６１ ストッパネジ
DESCRIPTION OF SYMBOLS 10 Explosion-proof type gas sensor apparatus 11 Sensor unit 12 Frame arrester 13 Base member 14 Guard member mounting part 15 Flange part 16 Screwing mounting part 17 Insulating resin 20 Gas sensor main body 21 Gas cell 21A Gas inlet 22 Infrared light source 23 Infrared sensor element 25 Light source driving printed circuit board 26 Sensor board 27 Lead wire 28 Cap member 29 Sleeve member 30 Guard member 31 Peripheral wall part 32 Bottom wall part 33 Gas introduction port 34 Gutter part 35 Through hole 40 Front side holding member 41 Central opening 42 Projection edge part 44 Fixing screw mounting hole 45 Set screw mounting through hole 50 Rear side holding member 51 Center opening 52 Engaging portion 53 Engaging piece 53A Engaging surface 54 Fixing screw mounting hole 55 Screw mounting through hole 56 Recess S Installation surface 60 Fixing screw 61 Stop Panez
Claims (3)
互いに固定用ネジにより固定されてガード部材の一端部およびベース部材を挟持して保持する一対の保持部材が装着されており、
固定用ネジは、当該防爆型ガスセンサー装置が設置された状態にあるときに、頭部が外部に露出されない状態とされることを特徴とする防爆型ガスセンサー装置。 A cylindrical sintered metal having air permeability, which is disposed so as to surround the periphery of the gas sensor main body, which is held by a base member attached to one end of the gas sensor main body and a gas sensor main body as a whole. An explosion-proof gas sensor device comprising a sensor unit made of a frame arrester made of steel, and a substantially bottomed cylindrical guard member screwed onto the base member so as to surround the periphery of the frame arrester,
A pair of holding members that are fixed to each other by a fixing screw and sandwich and hold one end of the guard member and the base member are mounted,
The explosion-proof gas sensor device, wherein the fixing screw is in a state where the head is not exposed to the outside when the explosion-proof gas sensor device is installed.
開口を有する一方の保持部材が当該開口内を螺合装着部が挿通された状態で装着されていると共に、開口を有し、当該開口の開口縁に内方に突出する突出縁部分が形成された他方の保持部材が当該開口内をガード部材が挿通された状態で装着されて、一方の保持部材の背面側から装着された固定用ネジによって互いに固定されており、
一方の保持部材における開口縁部分および他方の保持部材における突出縁部分によって、ベース部材のフランジ部分およびガード部材の鍔部分が挟持されて保持されていることを特徴とする請求項１に記載の防爆型ガスセンサー装置。 The base member includes a cylindrical mounting portion on which the guard member is mounted, and a threaded mounting portion for installing the entire gas sensor device, which is continuous through a flange portion having an outer diameter larger than that of the mounting portion. And
One holding member having an opening is mounted in a state where the threaded mounting portion is inserted through the opening, and a protruding edge portion that has an opening and protrudes inwardly is formed on the opening edge of the opening. The other holding member is attached in a state where the guard member is inserted through the opening, and is fixed to each other by a fixing screw attached from the back side of the one holding member,
The explosion-proof according to claim 1, wherein the flange portion of the base member and the flange portion of the guard member are sandwiched and held by the opening edge portion of one holding member and the protruding edge portion of the other holding member. Gas sensor device.
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