JP5903723B2 - Gas detector - Google Patents

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JP5903723B2
JP5903723B2 JP2011264937A JP2011264937A JP5903723B2 JP 5903723 B2 JP5903723 B2 JP 5903723B2 JP 2011264937 A JP2011264937 A JP 2011264937A JP 2011264937 A JP2011264937 A JP 2011264937A JP 5903723 B2 JP5903723 B2 JP 5903723B2
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gas
gas detector
male screw
housing
pump unit
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JP2013117440A (en
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信二 中嶋
信二 中嶋
公也 吉崎
公也 吉崎
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New Cosmos Electric Co Ltd
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Description

本発明は、被検出ガスの濃度などを判定するガス検知素子を備えたガス検出部と、被検出ガスをガス検出部に供給するポンプユニットとを筐体内に備えたガス検知器に関する。   The present invention relates to a gas detector including a gas detection unit including a gas detection element that determines a concentration of a detection gas and the like, and a pump unit that supplies the detection gas to the gas detection unit.

この種のガス検知器に関連する先行技術文献情報として下記に示す特許文献1がある。この特許文献1に記されたガス検知器は、直方体状の筐体の短辺側の側壁にガス導入口とガス排出口が設けられ、筐体の前記短辺の内側にガス検出部が配置され、筐体の長手方向に沿ってガス検出部と並ぶようにポンプユニットが配置されている。   There exists patent document 1 shown below as prior art document information relevant to this kind of gas detector. The gas detector described in Patent Document 1 is provided with a gas inlet and a gas outlet on the side wall on the short side of a rectangular parallelepiped casing, and a gas detector is disposed inside the short side of the casing. The pump unit is arranged so as to be aligned with the gas detection unit along the longitudinal direction of the housing.

特開2003−98139号公報(0015段落、図1)Japanese Unexamined Patent Publication No. 2003-98139 (paragraph 0015, FIG. 1)

しかし、特許文献1に記されたガス検知器では、ガス検出部とポンプユニットとが筐体の長手方向に沿って並置されているために、ガス検知器を構成する筐体の高さを小さくすることができるが、他方、平面視におけるガス検知器の大きさ、すなわちガス検知器の設置に必要な最小占有面積を十分に小さくでき難いという問題があった。   However, in the gas detector described in Patent Document 1, since the gas detection unit and the pump unit are juxtaposed along the longitudinal direction of the housing, the height of the housing constituting the gas detector is reduced. However, there is a problem in that it is difficult to sufficiently reduce the size of the gas detector in plan view, that is, the minimum occupied area necessary for installing the gas detector.

そこで、本発明の目的は、上に例示した従来技術によるガス検知器が与える課題に鑑み、メンテナンス性などを損なうことなく、設置に必要な最小占有面積をより小さくし易いガス検知器を提供することにある。   Accordingly, an object of the present invention is to provide a gas detector that can easily reduce the minimum occupied area necessary for installation without impairing maintainability in view of the problems given by the gas detector according to the prior art exemplified above. There is.

本発明によるガス検知器の特徴構成は、
筐体の下方に配置されたガス検出部と、前記筐体の上方に配置されると共に、前記ガス検出部の上方に少なくとも部分的に重なるように配置されたポンプユニットとを備え、
前記ポンプユニットが横向きに延びた長孔を有する板状の取付部を有し、
前記長孔に挿通された取付ボルトが、前記筐体の支持ブラケットに形成された雌ネジと螺合可能な第1雄ネジ部と、前記第1雄ネジ部の下端から下方に延びた小径部と、前記小径部の下端に設けられて前記雌ネジと螺合可能な第2雄ネジ部とを有する点にある。
The characteristic configuration of the gas detector according to the present invention is as follows:
A gas detector disposed below the housing, and a pump unit disposed above the housing and disposed so as to at least partially overlap the gas detector,
The pump unit has a plate-like attachment portion having a long hole extending sideways,
A mounting bolt inserted through the long hole includes a first male screw portion that can be screwed with a female screw formed on a support bracket of the housing, and a small-diameter portion that extends downward from the lower end of the first male screw portion. And a second male screw portion provided at the lower end of the small diameter portion and screwable with the female screw.

上記の特徴構成によるガス検知器では、ガス検出部とポンプユニットとが少なくとも部分的に互いに重なるように配置されるため、平面視におけるガス検知器の大きさ、すなわちガス検知器の設置に必要な最小占有面積をより小さくできる。しかも、取付ボルトを第1雄ネジ部のみが支持ブラケットに形成された雌ネジから抜け出て、取付ボルトの小径部が雌ネジの位置に来るように緩めると、ポンプユニットをガス検出部の側方のみでなく上方にも簡単に移動できるため、ガス検出部の上方が開放され、センサユニットなどに対するメンテナンス性も高く維持できる。
The gas detector according to the above characteristic structure, to be arranged so as to partially overlap each other even without the gas detection section and the pump unit Togasukuna, gas detector size in a plan view, that is, installation of gas detectors The required minimum occupation area can be made smaller. In addition, when the mounting bolt is loosened so that only the first male screw part comes out of the female screw formed on the support bracket and the small diameter part of the mounting bolt comes to the position of the female screw, the pump unit is moved to the side of the gas detection part. In addition to being easily movable upward as well, the upper portion of the gas detection unit is opened, and maintainability for the sensor unit and the like can be maintained high.

本発明の他の特徴構成は、前記取付ボルトは前記支持ブラケットに互いに横向きに離間して配置された少なくとも2つの雌ネジの一方に螺合され、
他方の雌ネジに螺合される前記第1雄ネジ部のみを備えた第2の取付ボルトの同第1雄ネジ部を受け入れる手段として、前記板状の取付部には、前記長孔の長手方向に沿って前記長孔と逆向きに開放された切り欠きが形成されている点にある。
In another feature of the present invention, the mounting bolt is screwed into one of at least two female screws disposed laterally spaced from each other on the support bracket,
As a means for receiving the first male screw portion of the second mounting bolt having only the first male screw portion screwed into the other female screw, the plate-like mounting portion has a longitudinal length of the elongated hole. A notch opened in the direction opposite to the long hole is formed along the direction.

本構成であれば、横向きに離間配置された少なくとも2つの雌ネジを用いることでポンプユニットを筐体に対してより確実に固定することができる。しかも、第2の取付ボルトを受け入れるべく板状の取付部に設けられた手段は、長孔の長手方向に沿って前記長孔と逆向きに開放された切り欠きとされているので、ポンプユニットを移動させたい場合は、取付ボルトの第1雄ネジ部のみを一方の雌ネジから抜け出させ、同時に、第2の取付ボルトを少しだけ緩めれば、ポンプユニットを僅かに横向きに移動させることで、第2の取付ボルトを切り欠きから解放させることができる。   If it is this structure, a pump unit can be more reliably fixed with respect to a housing | casing by using the at least 2 female screw spaced apart laterally. Moreover, since the means provided in the plate-like mounting portion for receiving the second mounting bolt is a notch opened in the longitudinal direction of the long hole in the direction opposite to the long hole, the pump unit To move the pump unit, remove only the first male screw part of the mounting bolt from one of the female screws, and at the same time loosen the second mounting bolt a little to move the pump unit slightly laterally. The second mounting bolt can be released from the notch.

本発明に係る防爆型のガス検知器を示す平面図である。It is a top view which shows the explosion-proof type gas detector which concerns on this invention. 本発明に係る防爆型のガス検知器を示す破断正面図である。It is a fracture front view showing an explosion-proof type gas detector concerning the present invention. 本発明に係る防爆型のガス検知器を示す斜視図である。It is a perspective view which shows the explosion-proof type gas detector which concerns on this invention. ガス検知器の排出用開口部付近を示す斜視図である。It is a perspective view which shows the discharge opening part vicinity of a gas detector. ガス検知器の導入用開口部付近を示す破断正面図である。It is a fracture | rupture front view which shows the opening part opening part of a gas detector. 固定された状態のポンプユニットを示す斜視図である。It is a perspective view which shows the pump unit of the state fixed. 上方に移動された状態のポンプユニットを示す斜視図である。It is a perspective view which shows the pump unit of the state moved upwards. 側方に移動された状態のポンプユニットを示す斜視図である。It is a perspective view which shows the pump unit of the state moved to the side. ポンプユニットが取り出されたガス検知器を示す斜視図である。It is a perspective view which shows the gas detector from which the pump unit was taken out. ガス検知器の蓋体を示す分解斜視図である。It is a disassembled perspective view which shows the cover body of a gas detector. ガス検知器の窓板部材を示す斜視図である。It is a perspective view which shows the window board member of a gas detector. ガス検知器の窓板部材を示す破断正面図である。It is a fracture front view showing a window board member of a gas detector.

以下に本発明を実施するための形態について図面を参照しながら説明する。
(ガス検知器の概略構造)
図1〜図3に示すポンプ式のガス検知器100は、容器状の筐体1を備え、この筐体1には、検出対象となるガスの濃度を検出するガス検出部5、検体ガスを筐体1の外部からガス検出部5に導入し、再び筐体1の外部に排出するためのポンプユニット6(ポンプの一例)、ガス検出部5によって検出されたガスの濃度値などを表示する表示部8、及び、これら各部の動作を制御する制御部9などが配置されている。
EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated, referring drawings.
(Schematic structure of gas detector)
A pump-type gas detector 100 shown in FIGS. 1 to 3 includes a container-like casing 1, in which a gas detection unit 5 that detects the concentration of a gas to be detected and a sample gas are provided. A pump unit 6 (an example of a pump) for introducing into the gas detection unit 5 from the outside of the housing 1 and discharging it to the outside of the housing 1 again, and the concentration value of the gas detected by the gas detection unit 5 are displayed. A display unit 8 and a control unit 9 for controlling operations of these units are arranged.

尚、本明細書において、前・後・左・右の方向を指す語句は図1を基準に定め、図1における上方寄りの位置を前側、下方寄りの位置を後側と称することとする。
また、上・下の方向を指す語句は図2を基準に定め、図2における上方寄りの位置を上側、下方寄りの位置を下側と称することとする。
In this specification, the terms indicating the front, rear, left, and right directions are defined with reference to FIG. 1, and the upper position in FIG. 1 is referred to as the front side, and the lower position is referred to as the rear side.
Further, the terms indicating the upward and downward directions are determined with reference to FIG. 2, and the upper position in FIG. 2 is referred to as the upper side and the lower position is referred to as the lower side.

ガス検出部5には、互いに種類の異なるガスを検出対象とした複数のガス検出素子を備えたセンサユニット52が設けられており、このガス検知器100は、検出対象ガスとして炭化水素やアルコールなどの可燃性ガスを含むため、ガス検出部5付近などにおける万一の爆発時にも筐体1の外部の爆発性ガスに引火する虞の少ない防爆型とされている。   The gas detection unit 5 is provided with a sensor unit 52 including a plurality of gas detection elements for detecting different types of gases. The gas detector 100 includes hydrocarbons, alcohols, and the like as detection target gases. Therefore, even in the event of an explosion in the vicinity of the gas detection unit 5 or the like, the explosion-proof type is less likely to ignite the explosive gas outside the housing 1.

筐体1は、ガス検出部5やポンプユニット6などを収納した主筐体2と、主筐体2の一部にヒンジ11によって枢支された蓋体4とを有する。主筐体2の開口部2Aの周囲に形成された環状溝2Bには無端状のシール部材21が係入されており、開口部を蓋体4で閉じ、蓋体4の四隅に設けられた貫通孔4Hに挿通した4本のボルト12で主筐体2に対して締め付けると筐体1の内部がシール部材21によって密閉状に維持される。   The housing 1 includes a main housing 2 that houses a gas detection unit 5, a pump unit 6, and the like, and a lid 4 that is pivotally supported by a hinge 11 on a part of the main housing 2. An endless seal member 21 is engaged with the annular groove 2B formed around the opening 2A of the main housing 2, and the opening is closed with the lid 4 and provided at the four corners of the lid 4. When the four casings 12 inserted into the through holes 4H are tightened against the main casing 2, the inside of the casing 1 is maintained in a sealed state by the seal member 21.

図6などに示すように、主筐体2の後側の側壁に形成された貫通孔には防爆耐圧型のパッキングランド82が取り付けられており、耐圧パッキングランドを介して筐体1内に引き込まれた電源用のケーブル36(図1を参照)などを接続するための端子台84が配置されている。   As shown in FIG. 6 and the like, an explosion-proof pressure-resistant packing land 82 is attached to a through-hole formed in the rear side wall of the main housing 2 and is drawn into the housing 1 through the pressure-resistant packing land. A terminal block 84 for connecting the power supply cable 36 (see FIG. 1) and the like is disposed.

(ガス導入部とガス排出部の構成)
主筐体2の左側部には、検出対象となるガスをガス検出部に導入するためのガス導入部22が備えられ、主筐体2の右側部には、一旦ガス検出部に導入されたガスを筐体1外に排出するためのガス排出部23が備えられている。ガス導入部22は可撓性チューブT1によってガス検出部5と接続されており、ガス排出部23は別の可撓性チューブT4によってポンプユニット6の排気部と接続されている。
(Configuration of gas inlet and gas outlet)
The left side of the main housing 2 is provided with a gas introduction unit 22 for introducing a gas to be detected into the gas detection unit, and the right side of the main housing 2 is once introduced into the gas detection unit. A gas discharge part 23 for discharging gas out of the housing 1 is provided. The gas introduction part 22 is connected to the gas detection part 5 by a flexible tube T1, and the gas discharge part 23 is connected to the exhaust part of the pump unit 6 by another flexible tube T4.

図2から理解されるように、ポンプユニット6の吸引力によってガス導入部22から導入されたガスは、可撓性チューブT1を介して先ずガス検出部5に供給され、次に別の可撓性チューブT2を介してガス検出部5の出口から脈取り用バッファ7に送られ、脈取り用バッファ7の出口から可撓性チューブT3を介してポンプユニット6のポンプ室(不図示)に入り、ポンプ室の排気部から可撓性チューブT4を介してガス排出部23に至り、筐体1外に排出される。   As understood from FIG. 2, the gas introduced from the gas introduction unit 22 by the suction force of the pump unit 6 is first supplied to the gas detection unit 5 through the flexible tube T <b> 1, and then the other flexible From the outlet of the gas detector 5 to the pulsation buffer 7 via the flexible tube T2, and enters the pump chamber (not shown) of the pump unit 6 via the flexible tube T3 from the outlet of the pulsation buffer 7. From the exhaust part of the pump chamber to the gas discharge part 23 via the flexible tube T4, the gas is discharged out of the housing 1.

図4と図5に示すように、ガス導入部22とガス排出部23を構成すべく主筐体2の左右側部に形成された開口部2C,2Dには、概して円筒状のガス流通スリーブ24が着脱自在に取り付けられている。ガス流通スリーブ24の内部の軸芯方向に関する中間位置には径方向内側に突出した小径部24Aが形成されており、この小径部24Aの外側には焼結金属で形成された防爆フィルタ25が内嵌状に配置されており、小径部24Aの内側には可撓性チューブT1,T4の一端を接続したホースニップル26が螺合されている。   As shown in FIGS. 4 and 5, the openings 2 </ b> C and 2 </ b> D formed on the left and right side portions of the main housing 2 to form the gas introduction part 22 and the gas discharge part 23 have a generally cylindrical gas distribution sleeve. 24 is detachably attached. A small-diameter portion 24A protruding radially inward is formed at an intermediate position in the axial direction inside the gas distribution sleeve 24, and an explosion-proof filter 25 formed of sintered metal is formed outside the small-diameter portion 24A. The hose nipple 26 which is connected to one end of the flexible tubes T1 and T4 is screwed into the small diameter portion 24A.

防爆フィルタ25は、ガス流通スリーブ24の内部にプレス装置などで平均粒子径が500〜700μmのステンレス鋼製の粒子を円板状に充填後、ガス流通スリーブ24の全体を所定の温度範囲で熱処理することで、ガス流通スリーブ24と一体状に成形されている。防爆フィルタ25は、適切な防爆機能を果たすために、厚さが2mmを超える円板状を呈し、乾燥密度は5.0g/cm3、最大気孔径は50μmとされている。 The explosion-proof filter 25 is filled with stainless steel particles having an average particle diameter of 500 to 700 μm in a disk shape by a press device or the like inside the gas distribution sleeve 24, and then the entire gas distribution sleeve 24 is heat-treated in a predetermined temperature range. By doing so, it is formed integrally with the gas distribution sleeve 24. In order to perform an appropriate explosion-proof function, the explosion-proof filter 25 has a disk shape with a thickness exceeding 2 mm, a dry density of 5.0 g / cm 3 , and a maximum pore diameter of 50 μm.

主筐体2の左右の開口部2C,2Dには、ガス流通スリーブ24の内側端面を当接支持する小径部2Pがあり、ガス流通スリーブは、この小径部2Pと、主筐体2の左右側部にネジで固定される環状の押さえ部材27との間に挟着固定されている。   The left and right openings 2C and 2D of the main housing 2 have a small diameter portion 2P that abuts and supports the inner end face of the gas distribution sleeve 24. The gas distribution sleeve includes the small diameter portion 2P and the left and right sides of the main housing 2. It is clamped and fixed between an annular pressing member 27 fixed to the side with a screw.

尚、主筐体2の左右の側面には、ガス流通スリーブ24の外周を取り囲む環状溝2Eが形成されており、この環状溝2Eには、主筐体2の外表面と押さえ部材27の内側端面との間をシールするための弾性部材からなるOリング28が係入されている。   An annular groove 2E that surrounds the outer periphery of the gas distribution sleeve 24 is formed on the left and right side surfaces of the main housing 2, and the outer surface of the main housing 2 and the inner side of the pressing member 27 are formed in the annular groove 2E. An O-ring 28 made of an elastic member for sealing between the end faces is engaged.

また、押さえ部材27の内周面にはホースニップル(不図示)などを接続するための雌ネジ(不図示)を形成することで、同ホースニップルに対して検出対象ガスをガス検知器100に対して導入またはガス検知器100から排出するためのホース30(図1を参照)を接続可能とされている。   In addition, a female screw (not shown) for connecting a hose nipple (not shown) or the like is formed on the inner peripheral surface of the pressing member 27, so that the detection target gas is supplied to the gas detector 100 with respect to the hose nipple. On the other hand, a hose 30 (see FIG. 1) for introducing or discharging from the gas detector 100 can be connected.

ガス検出部5は主筐体2の比較的底部側すなわち下方に配置され、ガス検知器100のコンパクト化の目的で、ポンプユニット6はガス検出部5の上方に隣接した位置に、言い換えれば、主筐体2の底面と交差する軸芯方向視にて少なくとも部分的にガス検出部5と重なるように配置されている。   The gas detection unit 5 is disposed on the relatively bottom side of the main housing 2, that is, below, and the pump unit 6 is positioned adjacent to the upper side of the gas detection unit 5 in order to make the gas detector 100 compact. Arranged so as to at least partially overlap the gas detector 5 when viewed in the axial direction intersecting the bottom surface of the main housing 2.

(ポンプユニットの取付け構造)
ガス検出部5のメンテナンスは、事前にポンプユニット6の固定を解除して横移動させることで可能になる。具体的な構成としては、図6〜図9から理解されるように、ポンプユニット6の下面の前端と後端とに横向きに延びた板状の被固定部材61A,61B(取付部の一例)が設けられており、他方、主筐体2の底部から立設された断面がL字状の支持ブラケット29A,29Bには、ポンプユニット6の被固定部材61A,61Bを支持可能な概して水平な支持板部29Sが設けられている。
(Pump unit mounting structure)
Maintenance of the gas detection unit 5 can be performed by releasing the fixation of the pump unit 6 and moving it in advance. As a specific configuration, as understood from FIGS. 6 to 9, plate-like fixed members 61 </ b> A and 61 </ b> B (an example of an attachment portion) extending laterally to the front end and the rear end of the lower surface of the pump unit 6. On the other hand, support brackets 29A and 29B, which are L-shaped in cross section standing from the bottom of the main housing 2, are generally horizontal and can support the fixed members 61A and 61B of the pump unit 6. A support plate portion 29S is provided.

被固定部材61A,61Bの右端には右向きに開放された比較的短い切り欠き62が形成されており、被固定部材61A,61Bの切り欠き62の左側には左右に長く延びた長孔63が形成されている。切り欠き62及び長孔63の前後方向の幅は、支持板部29Sの雌ネジ29Hに螺合される取付ボルト64の脚部の外径を超える寸法に設定されている。   A relatively short notch 62 opened to the right is formed at the right end of the fixed members 61A and 61B, and a long hole 63 extending to the left and right is formed on the left side of the notch 62 of the fixed members 61A and 61B. Is formed. The width of the notch 62 and the long hole 63 in the front-rear direction is set to a dimension that exceeds the outer diameter of the leg portion of the mounting bolt 64 that is screwed into the female screw 29H of the support plate portion 29S.

被固定部材61A,61Bの左右の両端部付近は、切り欠き62及び長孔63に挿通された特殊な形状の取付ボルト64を用いて支持板部29Sに固定される。
取付ボルト64の全長は比較的長く、頭部64Aの下端から下方に延びた第1雄ネジ部64Bと、第1雄ネジ部64Bの下端から下方に延びたネジ無しの滑らかな小径部64Cと、小径部64Cの下端から下方に延びた第2雄ネジ部64Dとを有する。
The vicinity of the left and right end portions of the fixed members 61A and 61B is fixed to the support plate portion 29S using a specially shaped mounting bolt 64 inserted through the notch 62 and the long hole 63.
The mounting bolt 64 has a relatively long overall length, a first male screw portion 64B extending downward from the lower end of the head portion 64A, and a smooth small diameter portion 64C having no screw extending downward from the lower end of the first male screw portion 64B. And a second male screw portion 64D extending downward from the lower end of the small diameter portion 64C.

ポンプユニット6を固定する際には、前後の切り欠き62及び長孔63に取付ボルト64を上方から挿通し、各取付ボルト64の第1雄ネジ部64Bを支持板部29Sの雌ネジ29Hに螺合させることで、切り欠き62及び長孔63の縁部を支持板部29Sに対して締め付ければよい。図6は固定が完了した状態を示す。   When the pump unit 6 is fixed, the mounting bolts 64 are inserted into the front and rear cutouts 62 and the long holes 63 from above, and the first male screw portions 64B of the mounting bolts 64 are connected to the female screws 29H of the support plate portion 29S. The edges of the notches 62 and the long holes 63 may be fastened to the support plate 29S by screwing. FIG. 6 shows a state where the fixing is completed.

他方、ガス検出部のメンテナンスなどの目的で、ポンプユニット6を横移動させたい場合は、4本の取付ボルト64を第1雄ネジ部64Bの全長が支持板部29Sの雌ネジ29Hから抜け出るまで緩めればよい。このように、第1雄ネジ部64Bはその全長が支持板部29Sの雌ネジ29Hから抜け出ており、取付ボルト64の第2雄ネジ部64Dは未だ支持板部29Sの下方に位置する状態では、取付ボルト64はネジ無しの小径部64Cの範囲内で支持板部29Sに対して上下に自在に移動できる状態となる。   On the other hand, when it is desired to move the pump unit 6 laterally for the purpose of maintenance of the gas detection part, the four mounting bolts 64 are removed until the entire length of the first male screw part 64B comes out of the female screw 29H of the support plate part 29S. Loosen. In this way, the first male screw portion 64B has a full length that has come out of the female screw 29H of the support plate portion 29S, and the second male screw portion 64D of the mounting bolt 64 is still positioned below the support plate portion 29S. The mounting bolt 64 can be freely moved up and down with respect to the support plate 29S within the range of the small diameter portion 64C without screws.

そこで、図7に示すように、ポンプユニット6を少し上方に移動させることで主筐体2の上縁部をクリアし、次に、図8に示すように、左側に横移動していくと、先ず切り欠き62の縁部が前後の右側の取付ボルト64から解放され、更に前後の左側の取付ボルト64が長孔63に対して長孔63の長さの範囲内で左右に自由に移動できるので、ポンプユニット6を左側に大きく横移動させることができ、ガス検出部5のメンテナンスなどが可能となる。この状態では、第2雄ネジ部64Dは取付ボルト64が支持板部29Sから抜け落ちることを規制する手段として機能している。   Therefore, as shown in FIG. 7, the upper edge of the main housing 2 is cleared by moving the pump unit 6 slightly upward. Next, as shown in FIG. First, the edge of the notch 62 is released from the front and rear right mounting bolts 64, and the front and rear left mounting bolts 64 move freely to the left and right within the length of the long hole 63 with respect to the long hole 63. As a result, the pump unit 6 can be moved laterally to the left and maintenance of the gas detector 5 can be performed. In this state, the second male screw portion 64D functions as a means for restricting the mounting bolt 64 from falling off the support plate portion 29S.

尚、脈取り用バッファ7のメンテナンス時やポンプユニット6そのものを交換などの目的で取り外したい場合は、図9に示すように、取付ボルト64の第2雄ネジ部64Dの上端を支持板部29Sの雌ネジ29Hに螺合させ、引き続き同雌ネジ29Hから上向きに抜け出させることで、取付ボルト64の全体を支持板部29Sから抜き取るとよい。   When it is desired to remove the pulse buffer 7 for maintenance or for the purpose of replacing the pump unit 6 itself, as shown in FIG. 9, the upper end of the second male screw portion 64D of the mounting bolt 64 is connected to the support plate portion 29S. The entire mounting bolt 64 may be removed from the support plate portion 29S by screwing it into the female screw 29H and then pulling it upward from the female screw 29H.

(ガス検出部の構成)
図8に示すように、ポンプユニット6を左側に大きく横移動させると、下方のガス検出部5にアクセス可能となる。ガス検出部5は、ソケット状のセンサボックス51と、このセンサボックス51に上方から着脱自在に装着された外形が概して円柱状のセンサユニット52とを有する。
(Configuration of gas detector)
As shown in FIG. 8, when the pump unit 6 is largely laterally moved to the left side, the lower gas detection unit 5 can be accessed. The gas detection unit 5 includes a socket-shaped sensor box 51 and a sensor unit 52 having a generally cylindrical outer shape that is detachably mounted on the sensor box 51 from above.

センサユニット52は、センサユニット52の上面に重ね合わされる外形が矩形のセンサユニット固定板53をセンサボックス51の上端面にネジ止めすることで固定されている。ネジと共にセンサユニット固定板53を取り外すと、センサユニット52の交換が可能となる。   The sensor unit 52 is fixed by screwing a sensor unit fixing plate 53 having a rectangular outer shape superimposed on the upper surface of the sensor unit 52 to the upper end surface of the sensor box 51. When the sensor unit fixing plate 53 is removed together with the screws, the sensor unit 52 can be replaced.

(表示部の構成)
図2に示すように、蓋体4の裏面には、制御部9を構成する主回路基板91や、検出されたガスの濃度値の表示などの役目を果たす補助回路基板92が支持されている。補助回路基板92には、検出されたガスの濃度値などを表示する7セグメントディスプレイなどからなる表示素子や警告などのメッセージを発するLEDなどが備えられており、この表示素子に表示された文字やLEDからの発光が蓋体4に設けられた表示部8から確認できるように構成されている。
(Configuration of display unit)
As shown in FIG. 2, the back surface of the lid 4 supports a main circuit board 91 that constitutes the control unit 9 and an auxiliary circuit board 92 that serves to display the detected gas concentration value. . The auxiliary circuit board 92 is provided with a display element such as a 7-segment display that displays the detected gas concentration value, an LED that emits a message such as a warning, and the like. The light emission from the LED can be confirmed from the display unit 8 provided on the lid 4.

図1に示すように、蓋体4の上面の前側寄りの位置には、比較的大きな矩形の主開口部4Aと、主開口部4Aの前後に配置された複数の円形の補助開口部4Bが貫通形成されており、表示素子に表示された数値やLEDからの発光は、蓋体4の裏面に配置された窓板部材41(図2を参照)を介して、これらの主開口部4Aおよび補助開口部4Bを通して確認できる。   As shown in FIG. 1, a relatively large rectangular main opening 4 </ b> A and a plurality of circular auxiliary openings 4 </ b> B arranged before and after the main opening 4 </ b> A are located at a position closer to the front side of the upper surface of the lid body 4. The numerical values displayed on the display elements and the light emitted from the LEDs are transmitted through these main openings 4A and the window plate member 41 (see FIG. 2) disposed on the back surface of the lid body 4. It can be confirmed through the auxiliary opening 4B.

窓板部材41は、横長の矩形の主表示窓44Aを備えたステンレス鋼製の窓板筐体42と、少なくとも主表示窓44Aの周縁部位を表裏から鋳包む(いくるむ)ようにインサート成形された透明な難燃性樹脂製の窓形成部43とで構成されている。
窓板筐体42は、プレス機を用いてステンレス鋼板に打ち抜き加工と曲げ加工とを施すことで得られており、概して長円形の天板部42Aと、天板部42Aの外周部位から下方に延設された支持脚部42Bとを有する。
前述した主表示窓44Aは天板部42Aのほぼ中央部に形成されており、主表示窓44Aの前後にも複数の円形の開口部が補助表示窓44Bとして貫通形成されている。
The window plate member 41 is insert-molded so that a stainless steel window plate housing 42 having a horizontally long rectangular main display window 44A and at least a peripheral portion of the main display window 44A are cast from the front and back. And a window forming portion 43 made of a transparent flame-retardant resin.
The window plate housing 42 is obtained by punching and bending a stainless steel plate using a press machine. The window plate housing 42 is generally formed from an oval top plate portion 42A and an outer peripheral portion of the top plate portion 42A downward. And an extended support leg 42B.
The above-described main display window 44A is formed at substantially the center of the top plate portion 42A, and a plurality of circular openings are formed through the front and rear of the main display window 44A as auxiliary display windows 44B.

支持脚部42Bは、天板部42Aの外周部位から延設され、外向きに突出した円弧状の断面を有する接続部42Cと、接続部の下端から概して鉛直に延びた主脚部42Dと、主脚部42Dの下端から延設され、内向きに突出した円弧状の断面を有する下端部42Eとを備える。   The support leg portion 42B extends from the outer peripheral portion of the top plate portion 42A, has a connection portion 42C having an arc-shaped cross section protruding outward, and a main leg portion 42D extending generally vertically from the lower end of the connection portion; A lower end portion 42E extending from the lower end of the main leg portion 42D and having an arcuate cross section protruding inwardly.

窓形成部43は、天板部42Aのみに設けられており、天板部42Aの最外周部位を除く矩形領域に亘ってインサート成形されることで、透明な難燃性樹脂は主表示窓44Aおよび全ての補助表示窓44Bの各開口部に充填されている。主表示窓44Aよりも外側で補助表示窓44Bを含む領域に一体的に延設された難燃性樹脂の部位は、天板部42Aの一部を表裏両面から挟み込むことで、窓形成部43を天板部42Aに固着させる挟持部の役目を果たしている。   The window forming portion 43 is provided only on the top plate portion 42A, and the transparent flame-retardant resin is formed on the main display window 44A by insert molding over a rectangular region excluding the outermost peripheral portion of the top plate portion 42A. In addition, the openings of all the auxiliary display windows 44B are filled. The part of the flame retardant resin integrally extended to the area including the auxiliary display window 44B outside the main display window 44A is sandwiched by a part of the top plate part 42A from both the front and back surfaces, thereby forming the window forming part 43. It plays the role of the clamping part which adheres to the top plate part 42A.

窓板部材41は、概して矩形の金属製の固定板45を介して、蓋体4の裏面の所定箇所にネジなどで押付け固定されている。固定板45の上面には前述した補助回路基板92が配置されており、固定板45の下面には主回路基板91が支持されている。また、固定板45には、補助回路基板92を主筐体2側の主回路基板91と電気的に接続するケーブルのコネクタ(不図示)を挿通するための貫通孔45Hが形成されている。   The window plate member 41 is pressed and fixed to a predetermined location on the back surface of the lid body 4 with a screw or the like via a generally rectangular metal fixing plate 45. The auxiliary circuit board 92 described above is disposed on the upper surface of the fixed plate 45, and the main circuit board 91 is supported on the lower surface of the fixed plate 45. Further, the fixing plate 45 is formed with a through hole 45H for inserting a cable connector (not shown) for electrically connecting the auxiliary circuit board 92 to the main circuit board 91 on the main housing 2 side.

透明な難燃性樹脂によって充填された主表示窓44Aおよび複数の補助表示窓44Bは、補助回路基板92の表示素子に表示された文字やPOWER、ALARM、TROUBLEなどを示すLEDからの発光を外部から視認可能とするための窓の役目を果たす。ALARMに対応して設置されたLEDは検出値が所定のレベルを超えたことを告知するための警報手段を構成する。   The main display window 44 </ b> A and the plurality of auxiliary display windows 44 </ b> B filled with a transparent flame-retardant resin emit light emitted from LEDs indicating characters, POWER, ALARM, TROUBLE, etc. displayed on the display element of the auxiliary circuit board 92. It plays the role of a window to make it visible from. The LED installed corresponding to ALARM constitutes an alarm means for notifying that the detected value has exceeded a predetermined level.

尚、LEDの位置に対応する3つの補助表示窓44Bの上下面からは、透明な難燃性樹脂からなる中実で概して円柱状の導光体部44Cが上下双方に一体的に突出形成されている。これらの導光体部44Cは、その下端面がLEDの上面に近接配置されており、LEDから発光された光を上方に伝えることで、発光状態を蓋体4の正面以外の方向からも確認し易いようにしている。   From the upper and lower surfaces of the three auxiliary display windows 44B corresponding to the positions of the LEDs, solid and generally cylindrical light guide portions 44C made of a transparent flame-retardant resin are integrally formed projecting upward and downward. ing. These light guide parts 44C are arranged so that their lower end faces are close to the upper surface of the LED, and the light emitted from the LED is transmitted upward to confirm the light emission state from directions other than the front of the lid 4 It is easy to do.

図10に示すように、蓋体4の裏面には弾性材料からなる環状のシール部材46が配置されており、固定板45による窓板部材41の押付け固定に基づいて、シール部材46は蓋体4の裏面と窓板部材41の天板部42Aとの間で挟着されている。また、蓋体4の裏面と窓板部材41の支持脚部42Bとの間に形成される環状の空間はエポキシ樹脂47によって満たされている。   As shown in FIG. 10, an annular seal member 46 made of an elastic material is disposed on the back surface of the lid body 4, and the seal member 46 is based on the pressing and fixing of the window plate member 41 by the fixing plate 45. 4 and the top plate portion 42A of the window plate member 41. An annular space formed between the back surface of the lid 4 and the support leg portion 42 </ b> B of the window plate member 41 is filled with the epoxy resin 47.

また、図2に示すように、蓋体4の表面付近には、窓板部材41の窓形成部43と対向し、且つ、主開口部4A及び補助開口部4Bを閉じるように、透明樹脂製の保護プレートが取り付けられている。   Further, as shown in FIG. 2, near the surface of the lid 4 is made of a transparent resin so as to face the window forming portion 43 of the window plate member 41 and close the main opening 4A and the auxiliary opening 4B. A protective plate is attached.

ここでは窓形成部43を構成する難燃性樹脂としてポリカーボネートが用いられているが、垂直燃焼試験で難燃グレード:V−0をクリアする透明な樹脂であればよい。   Here, polycarbonate is used as the flame retardant resin constituting the window forming portion 43, but it may be any transparent resin that clears the flame retardant grade: V-0 in the vertical combustion test.

〔別実施形態〕
〈1〉上記の実施形態では、被固定部材61A,61Bの右側にある比較的短い切り欠き62と、左側にある比較的長い長孔63との双方に対して、小径部64Cを備えた特殊な形状の取付ボルト64が固定手段として挿通されているが、図9の例におけるポンプユニット6の左側面部と主筐体2の内壁との間に切り欠き62の長さを上回る隙間がある場合は、右側の比較的短い切り欠き62については、小径部64Cと第2雄ネジ部64Dとが略され、実質的に取付ボルト64の頭部64Aと第1雄ネジ部64Bのみで構成された一般的な短いボルト(不図示)を用いることも可能である。この場合は、ポンプユニット6の移動に際して、右側の短いボルトについては、ボルトの頭部が切り欠き62の縁部から離間する程度まで緩めるだけでよい。
[Another embodiment]
<1> In the above embodiment, the special member provided with the small-diameter portion 64C for both the relatively short notch 62 on the right side of the fixed members 61A and 61B and the relatively long long hole 63 on the left side. 9 is inserted as a fixing means, but there is a gap exceeding the length of the notch 62 between the left side surface portion of the pump unit 6 and the inner wall of the main housing 2 in the example of FIG. As for the relatively short notch 62 on the right side, the small-diameter portion 64C and the second male screw portion 64D are omitted, and the head portion 64A of the mounting bolt 64 and the first male screw portion 64B are substantially constituted. It is also possible to use a general short bolt (not shown). In this case, when the pump unit 6 is moved, the short bolt on the right side only needs to be loosened to such an extent that the head of the bolt is separated from the edge of the notch 62.

〈2〉本発明は、ガス検出部とポンプユニットを備えたガス検知器であれば、防爆型以外のガス検知器にも適用可能である。 <2> The present invention is applicable to gas detectors other than the explosion-proof type as long as the gas detector includes a gas detector and a pump unit.

本発明は、ガス検出部とポンプユニットとを備えたガス検知器に従来見られた課題を解決するための技術として利用可能な発明である。   The present invention is an invention that can be used as a technique for solving the problems conventionally found in a gas detector including a gas detector and a pump unit.

1 筐体
2 主筐体
5 ガス検出部
6 ポンプユニット(ポンプ)
29A 支持ブラケット
29B 支持ブラケット
29H 雌ネジ
61A 被固定部材(板状の取付部)
61B 被固定部材(板状の取付部)
62 切り欠き
63 長孔
64 取付ボルト
64A 頭部
64B 第1雄ネジ部
64C 小径部
64D 第2雄ネジ部
100 ガス検知器
1 Housing 2 Main Housing 5 Gas Detection Unit 6 Pump Unit (Pump)
29A Support bracket 29B Support bracket 29H Female screw 61A Fixed member (plate-shaped mounting portion)
61B Fixed member (plate-shaped mounting part)
62 Notch 63 Long hole 64 Mounting bolt 64A Head 64B First male screw part 64C Small diameter part 64D Second male screw part 100 Gas detector

Claims (2)

筐体の下方に配置されたガス検出部と、前記筐体の上方に配置されると共に、前記ガス検出部の上方に少なくとも部分的に重なるように配置されたポンプユニットとを備え、
前記ポンプユニットが横向きに延びた長孔を有する板状の取付部を有し、
少なくとも前記長孔に挿通された取付ボルトが、前記筐体の支持ブラケットに形成された雌ネジと螺合可能な第1雄ネジ部と、前記第1雄ネジ部の下端から下方に延びた小径部と、前記小径部の下端に設けられて前記雌ネジと螺合可能な第2雄ネジ部とを有するガス検知器。
A gas detector disposed below the housing, and a pump unit disposed above the housing and disposed so as to at least partially overlap the gas detector,
The pump unit has a plate-like attachment portion having a long hole extending sideways,
A mounting bolt inserted through at least the long hole includes a first male screw portion that can be screwed with a female screw formed on a support bracket of the housing, and a small diameter that extends downward from the lower end of the first male screw portion. And a second male screw portion provided at a lower end of the small-diameter portion and screwable with the female screw.
前記取付ボルトは前記支持ブラケットに互いに横向きに離間して配置された少なくとも2つの雌ネジの一方に螺合され、
他方の雌ネジに螺合される前記第1雄ネジ部のみを備えた第2の取付ボルトの同第1雄ネジ部を受け入れる手段として、前記板状の取付部には、前記長孔の長手方向に沿って前記長孔と逆向きに開放された切り欠きが形成されている請求項1に記載のガス検知器。
The mounting bolt is screwed into one of at least two female screws disposed laterally apart from the support bracket;
As a means for receiving the first male screw portion of the second mounting bolt having only the first male screw portion screwed into the other female screw, the plate-like mounting portion has a longitudinal length of the elongated hole. The gas detector according to claim 1, wherein a notch opened in a direction opposite to the elongated hole is formed along a direction.
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