KR960003831Y1 - Filter for a gas sensor - Google Patents
Filter for a gas sensor Download PDFInfo
- Publication number
- KR960003831Y1 KR960003831Y1 KR2019930028479U KR930028479U KR960003831Y1 KR 960003831 Y1 KR960003831 Y1 KR 960003831Y1 KR 2019930028479 U KR2019930028479 U KR 2019930028479U KR 930028479 U KR930028479 U KR 930028479U KR 960003831 Y1 KR960003831 Y1 KR 960003831Y1
- Authority
- KR
- South Korea
- Prior art keywords
- activated carbon
- gas
- filter
- gas sensor
- metal
- Prior art date
Links
- 229910052751 metal Inorganic materials 0.000 claims description 30
- 239000002184 metal Substances 0.000 claims description 30
- 239000000919 ceramic Substances 0.000 claims description 15
- 239000012528 membrane Substances 0.000 claims description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 9
- 239000004065 semiconductor Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 36
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 28
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 8
- 229910002091 carbon monoxide Inorganic materials 0.000 description 8
- 239000011148 porous material Substances 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000001273 butane Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/004—CO or CO2
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Pathology (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
내용 없음.No content.
Description
제1도는 본 고안에 따른 가스센서용 필터의 일부전개단면도.1 is a partially developed cross-sectional view of a filter for a gas sensor according to the present invention.
제2도는 괴상 활성탄의 기공크기 분포도.2 is a pore size distribution of the bulk activated carbon.
제3도는 섬유상 활성탄의 기공크기 분포도.3 is a pore size distribution of fibrous activated carbon.
제4도는 감도와 피검가스 농도와의 관계도.4 is a relationship between sensitivity and test gas concentration.
제5도는 종래기술에 따른 가스센서용 필터의 일부절개단면도이다.5 is a partial cutaway sectional view of a filter for a gas sensor according to the prior art.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 가스센서용 필터 10 : 금속거즈1 gas filter 10 metal gauze
20 : 활성탄 섬유층 30 : 다공질막20: activated carbon fiber layer 30: porous membrane
140 : 반도성 세라믹소자 150 : 전기전도성 금속기둥140: semiconducting ceramic element 150: electrically conductive metal pillar
본 고안은 공기중에 0.2%정도만 희석되어 있어도 수분내 인명을 앗아가는 유도한 가스의 일종인 일산화탄소 가스센서의 필터에 관한 것으로, 특히 수명을 연장하고, 잡가스의 영향을 배제하기 위한 가스센서용 필터에 관한 것이다.The present invention relates to a filter of a carbon monoxide gas sensor, which is a kind of induced gas that kills human life in water even when only about 0.2% is diluted in air. Especially, a filter for a gas sensor to extend the life and to remove the influence of miscellaneous gas. It is about.
일반적으로 가스센서용 필터(100)는 제5도에 도시된 바와 같이 센서외장이 금속 거즈(110)를 윗면으로 하고 주위는 원기둥 모양의 플라스틱 하우징(120)으로 되어 있고, 금속 거즈(110)는 이중으로 되어 있으며, 두장의 금속 거즈(110)사이엔 활성탄 괴(130)가 얇게 들어 있다. 상기 활성탄 괴(130)는 일산화탄소가 아닌 부탄가스등의 잡가스를 흡착하는 성질이 있다. 따라서 중앙에 위치한 반도성 세라믹 소자(140)에 가급적 잡가스가 닿지 않도록 하여 잡가스에 의한 오동작을 방지하고 있다.In general, the gas sensor filter 100, as shown in FIG. 5, has a sensor housing having a metal gauze 110 as its upper surface, and a plastic housing 120 having a cylindrical shape around the metal gauze 110. It is a double, between the two metal gauze 110, the activated carbon 130 is thinly contained. The activated carbon 130 has a property of adsorbing miscellaneous gases such as butane gas but not carbon monoxide. Therefore, the miscellaneous gas is prevented from touching the semiconducting ceramic element 140 located in the center to prevent malfunction due to the miscellaneous gas.
그러나 플라스틱으로 이루어진 주위 하우징(20)은 가스가 통하지 않으므로 기체의 유동성이 낮아 응답속도가 빠르지 못한 단점이 있다. 이를 개선하기 위해 금속 거즈(110)로 둘러 싸이는 면적을 넓게하는 것이 바람직하나, 이 경우 이중의 금속거즈사이에 활성탄 괴(130)를 골고루 삽입하기가 어려운 문제점을 갖는 것이다.However, since the peripheral housing 20 made of plastic does not pass gas, the fluidity of the gas is low so that the response speed is not fast. In order to improve this, it is preferable to widen the area surrounded by the metal gauze 110, in which case it is difficult to evenly insert the activated carbon ingot 130 between the double metal gauze.
본 고안은 상기와 같은 종래의 문제점을 해결하기 위하여 안출된 것으로서, 활성탄이 전체를 둘러쌀 수 있도록 활성탄의 형상을 개선하고, 플라스틱 외장대신 가스의 유통이 잘되는 다공질 재료를 이용하여, 분지 및 잡가스의 혼입을 가급적 억제하고, 피검 가스의 유동을 용이하게 하여 가스에 대한 응답속도를 향상시킬 수 있도록 개선된 가스센서용 필터를 제공함에 그 목적이 있다.The present invention has been made to solve the above-mentioned conventional problems, improve the shape of the activated carbon so that the activated carbon can surround the whole, using a porous material that is well-distributed gas instead of plastic casing, branching and miscellaneous gas It is an object of the present invention to provide a filter for a gas sensor that is improved to suppress the mixing of as much as possible and to facilitate the flow of the test gas to improve the response speed to the gas.
상기 목적을 달성하기 위하여 본 고안은, 베이스를 관통하는 다수개의 전기 전도성 금속기둥이 배치되고, 그 중앙 상단부에는 반도체 세라믹소자에서 연장되는 금속 발열선이 상기 전기 전도성 금속기둥에 연결되는 가스센서에 있어서, 상기 전기전도성 금속기둥과 반도체 세라믹소자를 내부에 감싸도록 금속거즈가 상기 베이스상에 덮혀지고, 상기 금속거즈 외측면에는 활성탄섬유층이 형성되며, 상기 활성탄 섬유층의 외부에는 다공질막이 피복형성됨을 특징으로 하는 가스센서용 필터를 마련함에 의한다.In order to achieve the above object, the present invention provides a gas sensor in which a plurality of electrically conductive metal pillars penetrating a base are disposed, and a metal heating wire extending from a semiconductor ceramic element is connected to the electrically conductive metal pillar at a central upper end thereof. A metal gauze is covered on the base to enclose the electrically conductive metal pillar and the semiconductor ceramic element, an activated carbon fiber layer is formed on the outer surface of the metal gauze, and a porous membrane is coated on the outside of the activated carbon fiber layer. By providing a filter for the gas sensor.
이하, 본 고안을 도면에 따라서 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail with reference to the drawings.
본 고안의 가스센서용 필터(1)는 전기전도성 금속기둥(150)과 반도체세라믹소자(140)를 내부에서 감싸도록 상기 베이스(160)의 상부면에 금속거즈(10)가 덮여진다. 그리고, 상기 베이스(160)의 상부면에는 베이스를 관통하는 다수개의 전기전도성 금속기둥(150)이 배치되고, 그 중앙 상단부에는 반도체 세라믹 소자(140)에서 연장되는 금속 발열선(140a)이 상기 전기전도성 금속기둥(150)에 각각 연결되는 것이다.The gas sensor filter 1 according to the present invention is covered with a metal gauze 10 on the upper surface of the base 160 to surround the electrically conductive metal pillar 150 and the semiconductor ceramic element 140 therein. In addition, a plurality of electrically conductive metal pillars 150 penetrating the base are disposed on an upper surface of the base 160, and a metal heating line 140a extending from the semiconductor ceramic element 140 is disposed at the upper center portion thereof. The metal pillars 150 are respectively connected.
그리고, 상기 금속 거즈(10)의 외측면에는 활성탄 섬유층(20)이 형성되고, 그 외측면에는 다공질막(30)이 형성되는바, 상기 다공질막(30)은 구경이 0.5㎜ 내외의 금속재료로 이루어진다.The activated carbon fiber layer 20 is formed on the outer surface of the metal gauze 10, and the porous membrane 30 is formed on the outer surface of the metal gauze 10, and the porous membrane 30 has a diameter of about 0.5 mm. Is made of.
상기와 같이 구성된 본 고안의 가스센서용 필터(1)는, 분진이 다공질막(30)에서 차단되기 때문에 반도성 세라믹 소자(140)의 검지기능을 저하시키지 않게 된다.The gas sensor filter 1 of the present invention configured as described above does not deteriorate the detection function of the semiconducting ceramic element 140 because dust is blocked in the porous membrane 30.
한편, 상기 다공질막(30)을 통과한 피검가스는 다량의 일산화탄소 이외의 잡가스를 포함하고 있는바 이러한 잡가스는 다공질막(30) 내면의 활성탄 섬유층(20)에서 흡착제거된다. 이때 상기 활성탄 섬유층(20)은 종래기술에서 사용되었던, 괴상의 활성탄도 그 특성이 유사하나, 금속 거즈(10)와 금속 다공질막(30) 사이에 골고루 분포시키기가 기술적으로 난해하며, 아래의 표 1에서와 같이 괴상의 활성탄은 섬유상의 활성탄에 비하여 비표면적이 작게 측정되었는데 이는 잡가스의 흡착기능이 낮다는 것을 의미하므로, 가급적 비표면적이 넓게 측정된 섬유상의 활성탄을 사용하는 것이 유리하다. 또한, 이는 제2도에서도 보는 바와 같이 괴상 활성탄의 경우 기공이 크게 측정된 반면, 제3도에서 보듯이 섬유상 활성탄은 0.01㎛정도의 작은 기공이 한가닥 한가닥의 섬유에 존재하기 때문에 상기 괴상활성탄 보다는 잡가스의 흡착효율이 현저히 높은 것이다.On the other hand, the test gas passing through the porous membrane 30 contains a large amount of miscellaneous gases other than carbon monoxide. Such miscellaneous gases are adsorbed and removed from the activated carbon fiber layer 20 on the inner surface of the porous membrane 30. At this time, the activated carbon fiber layer 20 is similar to the characteristics of the bulk activated carbon used in the prior art, but it is technically difficult to distribute evenly between the metal gauze 10 and the metal porous membrane 30, the following table As shown in Fig. 1, the bulk activated carbon has a smaller specific surface area than that of fibrous activated carbon, which means that the adsorption function of miscellaneous gas is low. Therefore, it is advantageous to use the activated carbon having a large specific surface area. In addition, as shown in FIG. 2, the pores of the bulk activated carbon were largely measured. On the other hand, as shown in FIG. The adsorption efficiency of gas is remarkably high.
[표 1]TABLE 1
괴상 활성탄과 섬유상 활성탄의 비표면적 및 기공분포 측정결과Measurement results of specific surface area and pore distribution of bulk activated carbon and fibrous activated carbon
그리고, 잡가스가 제거된 일산화 탄소는 금속 거즈(10)를 통과하여 반도성 세라믹 소자(140)에 접하게 되어 검지되며 이는, 일반적으로 일산화탄소의 농도가 높을수록 반도성 세라믹소자의 저항이 낮아지므로, 반도성 세라믹 소자(140)에 약 5Volts의 전압을 인가하였을때 흐르는 전류를 측정하여 그 전류의 크기를 측정한 후 하기의 식을 이용하여 일산화탄소에 대한 감도를 계산한다.In addition, the carbon monoxide from which miscellaneous gas is removed passes through the metal gauze 10 and comes into contact with the semiconducting ceramic element 140. In general, the higher the concentration of the carbon monoxide, the lower the resistance of the semiconducting ceramic element, When a voltage of about 5 Volts is applied to the semiconducting ceramic device 140, the current flowing through the ceramic ceramic device 140 is measured, and then the sensitivity to carbon monoxide is calculated using the following equation.
감도(sensitivity) = 1/loSensitivity = 1 / lo
1 : 일산화탄소가 있을때의 전류치1: Current value in the presence of carbon monoxide
lo : 일산화탄소가 없을때의 전류치lo: current value without carbon monoxide
상기식에 의하여 감도가 계산되면 제4도에 정리한 바와 같은 감도와 피검가스 농도와의 관계도를 이용하여 현재의 피검가스 농도를 알아낸다.When the sensitivity is calculated by the above equation, the current test gas concentration is found using the relationship between the sensitivity and the test gas concentration as summarized in FIG.
상기에서와 같이 본 고안에 의하면, 피검가스내 분진 및 잡가스를 다공질막(30)과 활성탄 섬유층(20)이 효과적으로 제거하기 때문에 반도성 세라믹 소자(140)의 수명을 향상시키고, 오동작을 억제하며, 측면으로도 피검가스가 유통될 수 있기 때문에 피검가스의 감지속도를 향상시키는 효과가 얻어지는 것이다.As described above, according to the present invention, since the porous membrane 30 and the activated carbon fiber layer 20 effectively remove dust and miscellaneous gas in the test gas, the life of the semiconducting ceramic element 140 is improved, and the malfunction is suppressed. In addition, since the test gas can also be distributed from the side, an effect of improving the detection speed of the test gas is obtained.
뿐만 아니라, 본원 고안에서는, 내부에 위치한 금속 거즈(10)가 다공질막(30)과 같은 재질로 이루어져 있지만, 다른 재료로서 각각 이루어질 수 있다. 예를 들면, 다공질막(30)의 재료를 상온에서 잘 견딜수 있는 세라믹재료(ceramics)나 스폰지 재료로서 구성할 수도 있는 것이다. 상기와 같이 세라믹재료로서 다공질막(30)을 구성하면 부식에 의한 파손을 효과적으로 방지할 수 있으며 이러한 세라믹재료의 다공질막(30)도 본 고안의 범주에 속하게 됨은 물론이다.In addition, in the present invention, the metal gauze 10 located therein is made of the same material as the porous membrane 30, but may be made of different materials, respectively. For example, the material of the porous membrane 30 may be configured as a ceramic material or a sponge material that can withstand normal temperature well. If the porous membrane 30 is formed as a ceramic material as described above, the damage caused by corrosion can be effectively prevented, and the porous membrane 30 of the ceramic material also belongs to the scope of the present invention.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019930028479U KR960003831Y1 (en) | 1993-12-18 | 1993-12-18 | Filter for a gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019930028479U KR960003831Y1 (en) | 1993-12-18 | 1993-12-18 | Filter for a gas sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR950019759U KR950019759U (en) | 1995-07-24 |
| KR960003831Y1 true KR960003831Y1 (en) | 1996-05-09 |
Family
ID=19371646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019930028479U KR960003831Y1 (en) | 1993-12-18 | 1993-12-18 | Filter for a gas sensor |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR960003831Y1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101350697B1 (en) * | 2011-11-25 | 2014-01-10 | 현대자동차주식회사 | Gas detection sensor |
-
1993
- 1993-12-18 KR KR2019930028479U patent/KR960003831Y1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101350697B1 (en) * | 2011-11-25 | 2014-01-10 | 현대자동차주식회사 | Gas detection sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| KR950019759U (en) | 1995-07-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1215117A (en) | Alkane gas sensor comprising tin oxide semiconductor | |
| US4441981A (en) | Gas sensor | |
| US4131773A (en) | Apparatus for detecting presence of oil in a body of water | |
| KR880011590A (en) | Oxygen sensor and air-fuel ratio control device of internal combustion engine applying the sensor | |
| GB1578199A (en) | Gas concentration sensing device | |
| KR870000589A (en) | Gas sensor | |
| KR960003831Y1 (en) | Filter for a gas sensor | |
| US4455378A (en) | Method of determining the content of an anesthetic gas in a selected location | |
| JPS5734446A (en) | Nultifunctional detecting element and multifunctional detector | |
| JPS6426137A (en) | Gas sensor | |
| KR920006739A (en) | Probe for measuring carbon activity in molten iron using mixed electrode | |
| US4235690A (en) | Trace gas sensor | |
| JPS61172045A (en) | Gas detection element with filter | |
| JPH0523124U (en) | Capacitance type humidity sensor | |
| JPS59112255A (en) | Moisture sensitive device | |
| EP0152636A1 (en) | Electrode assembly for measuring the concentration of an electro-chemical active species | |
| RU93005234A (en) | MEASURING TEST | |
| KR840006853A (en) | Carbon Monoxide Gas Detector | |
| JPH0360385B2 (en) | ||
| JPS5728248A (en) | Oxygen sensor | |
| JPH0326451Y2 (en) | ||
| SU1667176A1 (en) | Sensor for measuring metal vapour concentration in gas media | |
| JPS61172048A (en) | Gas detection element with filter | |
| SU1052974A1 (en) | Transducer for inspecting current conduction of material | |
| JPS63292051A (en) | Gas detecting element |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E701 | Decision to grant or registration of patent right | ||
| REGI | Registration of establishment | ||
| FPAY | Annual fee payment |
Payment date: 20010427 Year of fee payment: 6 |
|
| LAPS | Lapse due to unpaid annual fee |