JP4804213B2 - Gas detector - Google Patents

Gas detector Download PDF

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JP4804213B2
JP4804213B2 JP2006115278A JP2006115278A JP4804213B2 JP 4804213 B2 JP4804213 B2 JP 4804213B2 JP 2006115278 A JP2006115278 A JP 2006115278A JP 2006115278 A JP2006115278 A JP 2006115278A JP 4804213 B2 JP4804213 B2 JP 4804213B2
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water
gas
gas inlet
gas detector
case
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JP2007285956A (en
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晴一 大谷
守 古里
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Riken Keiki KK
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Riken Keiki KK
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Description

本発明は、結露が生じやすい環境で使用するのに適したガス検出器に関する。   The present invention relates to a gas detector suitable for use in an environment where condensation is likely to occur.

環境中のガスを検出するガス検出器は、図３（イ）に示したようにガス取入口１１が設けられたケース１２にセンサ本体１３を収容するとともに、塵埃や水滴の侵入を防止するためフッ素樹脂などのフィルムからなる撥水通気性膜１４をガス取入口１１に取り付けて構成されている。   As shown in FIG. 3 (a), the gas detector for detecting the gas in the environment accommodates the sensor main body 13 in the case 12 provided with the gas inlet 11 and prevents intrusion of dust and water droplets. A water-repellent breathable film 14 made of a film such as a fluororesin is attached to the gas inlet 11.

このように構成されたガス検出器を比較的湿度が高く、かつ温度変化が大きい環境でしようすると、ケース１２の開口周縁や、撥水通気性膜１４に結露して水滴Ｗが付着し、最終的には図３(ロ)に示したようにガス取入口１１を封止するにいたるという問題がある。
このような問題を解消するため、ケース内にヒータを収容して結露以上の温度に維持することも提案されているが、消費電力が大きくなったり、構造が複雑化するなどの新たな問題を招く。
また、取入口の撥水膜が斜めになるように配置して水滴を速やかに落下させることも提案されているが、配置形態に制限を受ける等の問題がある。 If the gas detector configured as described above is used in an environment where the humidity is relatively high and the temperature change is large, the water droplets W adhere to the periphery of the opening of the case 12 and the water-repellent air-permeable film 14, and the final result. Specifically, there is a problem that the gas inlet 11 is sealed as shown in FIG.
In order to solve such problems, it has been proposed to store a heater in the case and maintain it at a temperature higher than dew condensation, but there are new problems such as increased power consumption and complicated structure. Invite.
In addition, it has been proposed that the water-repellent film of the intake port is disposed so as to be inclined so that the water droplet is quickly dropped, but there is a problem that the arrangement form is limited.

本発明はこのような問題に鑑みてなされたものであってその目的とするところは、構造の複雑化や、設置形態に制限を受けることなく結露に起因するガス取入口の閉塞を防止することができるガス検出器を提案することである。   The present invention has been made in view of such a problem, and an object thereof is to prevent the gas intake from being blocked due to condensation without being complicated in structure and without being limited by the installation form. It is to propose a gas detector that can.

このような課題を達成するために本発明においては、ガス取入口を有するケースにセンサ本体を収容するとともに、前記ガス取入口に撥水通気性膜を張設して構成されたガス検出器において、前記ガス取入口の外周にリング状の水吸収材を配置して構成されている。   In order to achieve such a problem, the present invention provides a gas detector in which a sensor main body is accommodated in a case having a gas inlet, and a water-repellent breathable film is stretched on the gas inlet. The ring-shaped water absorbing material is arranged on the outer periphery of the gas intake port.

本発明によれば、ガス取入口の外縁に水吸収材を配置するという簡単な構成により撥水通気性膜の水滴を水吸収材によりケース側に引き寄せて、ガス取入口から水滴を排除できる。   According to the present invention, water droplets of the water-repellent breathable membrane can be drawn to the case side by the water absorbing material by a simple configuration in which the water absorbing material is disposed on the outer edge of the gas inlet, and the water droplets can be removed from the gas inlet.

図１は、本発明のガス検出器の一実施例を示すものであって、図中符号１０は、ガス検出器１０であって、周知のようにガス取入口１１が形成されたケース１２に、センサ本体１３を収容するとともに、ガス取入口１１には塵埃や水滴の侵入を防止する撥水通気性膜１４、例えばフッ素樹脂の多孔質膜を張設して構成されている。   FIG. 1 shows an embodiment of a gas detector according to the present invention. In FIG. 1, reference numeral 10 denotes a gas detector 10, which is well-known in a case 12 in which a gas inlet 11 is formed. In addition, the sensor main body 13 is accommodated, and the gas inlet 11 is constructed by stretching a water-repellent breathable film 14 that prevents intrusion of dust and water droplets, for example, a porous film of fluororesin.

なお、この実施例ではセンサ本体として接触燃焼式半導体ガスセンサ本体を使用しているが、大気を開口から取り入れて検出する形式のものならいずれの形式のものでも使用できる。   In this embodiment, a contact combustion type semiconductor gas sensor main body is used as the sensor main body, but any type can be used as long as it is a type that detects air through an opening.

図中符号２０は、本発明が特徴とする水吸収材で、中央部に開口２１を有し、かつケース１２のガス取入口１１の外側に固定可能なリング状の親水性材で、接着剤や両面接着テープで固着されたり、同図(ロ)に示したようにケース１２に形成された爪１５により固定されている。   Reference numeral 20 in the figure denotes a water absorbent material characterized by the present invention, which is a ring-shaped hydrophilic material that has an opening 21 in the center and can be fixed to the outside of the gas inlet 11 of the case 12. Or fixed with a double-sided adhesive tape, or fixed with claws 15 formed on the case 12 as shown in FIG.

図１(ハ)は、水吸収材２０の一実施例を示すものであって、ガス取入口となる開口２１の周縁２１ａは、少なくともケース１２のガス取入口１１のガスの流入に支障を来たず、かつガス取入口１１の外縁１１ａよりも若干内側、つまり撥水通気性膜１４と対向するサイズが設定されている。   FIG. 1 (c) shows an embodiment of the water absorbing material 20, and the peripheral edge 21 a of the opening 21 serving as a gas inlet obstructs at least the gas inflow of the gas inlet 11 of the case 12. In addition, the size is set slightly inside the outer edge 11 a of the gas inlet 11, that is, facing the water-repellent breathable film 14.

なお、図中符号３０は、ガス検出器１０を固定するための基台を示す。   In addition, the code | symbol 30 in a figure shows the base for fixing the gas detector 10. FIG.

この実施例において環境中の温度が低下すると、金属などのプレスにより構成されるケース１２は、撥水通気性膜１４よりも早く温度が低下するため、取入口１１の内周縁に最初に結露し、続いて撥水通気性膜１４の、ガス取入口１１の内周縁近傍領域に結露が生じて水滴Ｗが発生する。取入口１１周辺の水滴は、ここに位置する水吸収材２０に吸収され、この過程で撥水通気性膜１４に付着している水滴も撥水通気性膜１４の撥水性と水吸収材２０の親水性との表面張力の差により水吸収材２０に吸い寄せられる。   In this embodiment, when the temperature in the environment is lowered, the temperature of the case 12 constituted by a press made of metal or the like is lowered faster than that of the water-repellent breathable film 14, so that dew condensation is first formed on the inner peripheral edge of the intake port 11. Subsequently, dew condensation occurs in the vicinity of the inner peripheral edge of the gas intake port 11 of the water-repellent breathable film 14 and water droplets W are generated. Water droplets around the intake 11 are absorbed by the water absorbent 20 located here, and the water droplets adhering to the water repellent breathable film 14 in this process are also the water repellency of the water repellent breathable film 14 and the water absorbent 20. It is attracted to the water absorbing material 20 due to the difference in surface tension from the hydrophilicity of the water.

一方、水吸収材２０に吸収された水は、水吸収材２０の保水力以上となった時点で自重により水滴Ｗ’となって水吸収材２０から離脱する。   On the other hand, when the water absorbed by the water absorbent 20 becomes equal to or greater than the water retention capacity of the water absorbent 20, it becomes water droplets W ′ by its own weight and leaves the water absorbent 20.

長時間の使用により水吸収材２０の水吸収能力が低下した場合には、水吸収材２０が接着材で固着されている場合には引き剥がしたり、また爪１５で固定されている場合には取り外して新しいものに交換する。   When the water absorption capacity of the water absorbent 20 is reduced due to long-term use, when the water absorbent 20 is fixed with an adhesive, it is peeled off, or when it is fixed with a nail 15 Remove and replace with new one.

なお、上述の実施例においてはガス取入口１１の面、つまり撥水通気性膜１４を下方として水平に配置する場合について説明したが、斜めとなるように配置しても結露による水滴を除去できることは明らかである。すなわち、ガス取入口１１を下方として配置すれば結露による水滴を除去できるという効果を奏する。   In the above-described embodiment, the surface of the gas inlet 11, that is, the case where the water-repellent breathable film 14 is horizontally disposed has been described, but water droplets due to dew condensation can be removed even when disposed obliquely. Is clear. That is, if the gas inlet 11 is arranged at the lower side, there is an effect that water droplets due to condensation can be removed.

さらに上述の実施例では撥水通気性膜１４が下方を向くように配置し、水吸収材２０に溜まった水を自重により排除する場合について説明したが、結露により生じる水量が少ない環境で使用する場合には、撥水通気性膜１４が上方を向くように配置しても、撥水通気性膜１４の水滴を撥水通気性膜１４の撥水性と水吸収材２０の親水性との表面張力の差により撥水通気性膜上の水滴を水吸収材２０に吸い寄せて除去でき、結露によるガス取入口１１の閉塞を防止できることは明かである。すなわち、本発明によれば、配置形態にかかわりなく結露によるガス取入口１１の閉塞を防止することができる。   Further, in the above-described embodiment, the case where the water-repellent breathable film 14 is disposed so as to face downward and the water accumulated in the water absorbing material 20 is removed by its own weight is used. In this case, even if the water-repellent breathable film 14 is arranged so as to face upward, the water droplets of the water-repellent breathable film 14 are applied to the surface of the water-repellent breathable film 14 and the hydrophilicity of the water absorbent 20. It is clear that water drops on the water-repellent breathable membrane can be sucked and removed by the difference in tension to the water absorbent 20 and blockage of the gas inlet 11 due to condensation can be prevented. That is, according to the present invention, it is possible to prevent the gas intake 11 from being blocked due to condensation regardless of the arrangement form.

図（イ）、(ロ)は、それぞれ本発明のガス検出器の一実施例を示す断面図であり、また図(ハ)は水吸収材の一実施例を示す斜視図である。FIGS. 1A and 1B are cross-sectional views showing an embodiment of the gas detector of the present invention, and FIG. 1C is a perspective view showing an embodiment of the water absorbent. 同上ガス検出器に結露が生じた状態を示す図である。It is a figure which shows the state which dew condensation produced in the gas detector same as the above. 図(イ)、(ロ)は、それぞれ従来のガス検出器に生じる結露の状態を示す図である。FIGS. 1A and 1B are diagrams showing the state of condensation occurring in the conventional gas detector, respectively.

符号の説明Explanation of symbols

１０ ガス検出器 １１ ガス取入口 １２ ケース １３ センサ本体 １４ 撥水通気性膜 ２０ 水吸収材 ２１ 開口 １５ 爪 Ｗ 水滴   DESCRIPTION OF SYMBOLS 10 Gas detector 11 Gas inlet 12 Case 13 Sensor main body 14 Water repellent breathable film 20 Water absorbent 21 Opening 15 Nail W Water droplet

Claims (2)

ガス取入口を有するケースにセンサ本体を収容するとともに、前記ガス取入口に撥水通気性膜を張設して構成されたガス検出器において、
前記ガス取入口の外周にリング状の水吸収材を配置して構成されたガス検出器。 In a gas detector configured to house a sensor main body in a case having a gas inlet, and to stretch a water-repellent breathable film on the gas inlet,
A gas detector configured by disposing a ring-shaped water absorbent on the outer periphery of the gas inlet. 前記水吸収材が着脱可能に固定されている請求項１に記載のガス検出器。   The gas detector according to claim 1, wherein the water absorbing material is detachably fixed.
JP2006115278A 2006-04-19 2006-04-19 Gas detector Expired - Fee Related JP4804213B2 (en)

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JP5318467B2 (en) * 2008-06-04 2013-10-16 矢崎総業株式会社 Gas sensor
WO2020116034A1 (en) * 2018-12-05 2020-06-11 日立オートモティブシステムズ株式会社 Physical quantity measurement device

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JP4358393B2 (en) * 1998-12-28 2009-11-04 日本特殊陶業株式会社 Gas sensor
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JP4456369B2 (en) * 2004-01-07 2010-04-28 タカラベルモント株式会社 Steam blowing structure of steam generator
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