CN102636542B - Gas sensor - Google Patents
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- CN102636542B CN102636542B CN201210081281.9A CN201210081281A CN102636542B CN 102636542 B CN102636542 B CN 102636542B CN 201210081281 A CN201210081281 A CN 201210081281A CN 102636542 B CN102636542 B CN 102636542B
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- electrode
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- waterproof film
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- 239000011148 porous material Substances 0.000 claims abstract description 17
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 29
- 238000005213 imbibition Methods 0.000 claims description 23
- 239000012528 membrane Substances 0.000 claims description 13
- 239000008151 electrolyte solution Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 abstract 3
- 239000011358 absorbing material Substances 0.000 abstract 2
- 230000002265 prevention Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 42
- 239000001301 oxygen Substances 0.000 description 24
- 229910052760 oxygen Inorganic materials 0.000 description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 22
- 239000010410 layer Substances 0.000 description 20
- 238000006722 reduction reaction Methods 0.000 description 11
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 10
- 230000009467 reduction Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 2
- 150000002926 oxygen Chemical class 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000007784 solid electrolyte Substances 0.000 description 2
- 229920001410 Microfiber Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000003658 microfiber Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention provides a gas sensor, which comprises a shell, a measuring electrode, a support, a counter electrode, a plug and a shell cover. The top of the shell is opened, the bottom of the shell is provided with a flange, and perforative pores are arranged on the bottom wall of the shell in a region surrounded by the flange; the measuring electrode is disposed in the region surrounded by the flange, and external gas reaches the measuring electrode via the pores; the top and the bottom of the support are opened, the support hermetically matches with the flange, and the measuring electrode is fixedly clamped between the shell and the support; the counter electrode is disposed in the support, and a first liquid absorbing material layer is arranged between the counter electrode and the measuring electrode; the plug is provided with an air outlet hole, and the first liquid absorbing material layer and the counter electrode are fixedly clamped between the support and plug; and the shell cover is provided with an opening, the shell cover is detachably connected with the top of the shell, and the opening hermetically matches with the plug and is communicated with the air outlet hole. Miniaturization of the gas sensor is realized, and the gas sensor is compact in structure and fine in liquid leakage prevention property.
Description
Technical field
The present invention relates to a kind of gas sensor, relate in particular to a kind of electrochemical gas sensor of Miniaturizable.
Background technology
Electrochemical gas sensor is a kind of sensor that is widely used at present gas-monitoring.The patent No. is the oxygen sensor that the United States Patent (USP) of US4132616 has been described a routine galvanic cell type, this oxygen sensor at work, oxygen is diffused into potential electrode by pore, there is reduction reaction with the power and water combination at potential electrode place, form hydroxide ion, hydroxide ion arrives electrode to react with lead electrode by electrolyte flow and forms massicot, power and water.In potential electrode and the size of the electric current forming between to electrode and the percent concentration of oxygen be directly proportional.
Application number is to disclose a routine current mode oxygen sensor in the Chinese patent application of CN200710038443.X.This sensor is when work, and oxygen is diffused into working electrode by pore and is combined with hydrogen ion and electronics, reduction reaction occurs and form hydrone, and hydrone is penetrated into its opposite side by solid electrolyte; On the other hand, to electrode place, hydrone is by electrolysis, form oxygen, hydrogen ion and electronics, in the oxygen of formation, hydrogen ion and electronics, oxygen is discharged from venthole, hydrogen ion moves to working electrode by solid electrolyte, electronics by external circuit from electrode is reached to working electrode.Move to the hydrogen ion of working electrode and from hydrogen ion and electronics that the electronics of electrode is consumed for compensating aforementioned reduction reaction, and form reduction current.The size of reduction current is directly proportional to the percent concentration of oxygen.This patent development the method for making electrode/interlayer/electrode assemblie, the method can be used for making gas oxygen sensor.
But the structure of above-mentioned gas sensor is often larger, cannot miniaturization.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of gas sensor, and the structure of this gas sensor is beneficial to miniaturization.
For solving the problems of the technologies described above, the invention provides a kind of gas sensor, comprising:
Housing, its top is opened wide, bottom has flange, in the shell bottom wall in the region that described flange surrounds, has the pore running through;
Potential electrode, is arranged in the region of described flange encirclement, and extraneous gas arrives described potential electrode by described pore;
The support of top and bottom-open, coordinates with described flange seal, and described potential electrode is clamped between described housing and support;
Be arranged in described support to electrode, described to being provided with the first imbibition material layer between electrode and potential electrode;
The stopper with venthole, described the first imbibition material layer and electrode is clamped between described support and stopper;
Be provided with the cap of opening, the top of described cap and described housing is for removably connecting, and is sealed and matched between described opening and described stopper, and described opening communicates with described venthole.
Alternatively, between the opening of described cap and the venthole of described stopper, be provided with the first breathing waterproof film.
Alternatively, be provided with the second breathing waterproof film in the bottom outer wall of described housing, extraneous gas enters described kapillary by described the second breathing waterproof film.
Alternatively, described waterproof ventilated membrane outside is also provided with dustproof membrane, and extraneous gas enters described kapillary by described dustproof membrane and the second breathing waterproof film successively.
Alternatively, described gas sensor also comprises:
Contrast electrode, is positioned on described the first imbibition material layer;
The second imbibition material layer, is positioned on described contrast electrode layer, described electrode is positioned on described the second imbibition material layer.
Alternatively, on the sidewall of described housing, be formed with via hole, wire through described via hole and described potential electrode with electrode is connected.
Alternatively, on the sidewall of described support, there are a plurality of grooves, between adjacent notches, there is teat.
Alternatively, under described potential electrode, be also provided with the 3rd breathing waterproof film and catalyzer on the inwall of described housing bottom, extraneous gas is by described kapillary and the 3rd breathing waterproof film and arrive described potential electrode via described catalyzer.
Alternatively, described support, housing and cap surround reservoir, in described reservoir, are filled with electrolytic solution.
Compared with prior art, the present invention has the following advantages:
In the gas sensor of the embodiment of the present invention, support coordinates with the flange seal of housing bottom, potential electrode is clamped between housing and support, stopper and support are sealed and matched, to be clamped between support and stopper electrode, this structure member is few, assembling is simple, by the mode being sealed and matched, fixes each mould layer and electrode, the processing step in the time of can reducing assembling.
Accompanying drawing explanation
Fig. 1 is the sectional structure chart of the gas sensor of the embodiment of the present invention;
Fig. 2 be potential electrode below in the gas sensor of the embodiment of the present invention the 3rd breathing waterproof film and on the vertical view of catalyzer;
Fig. 3 is the assembly structure figure of gas sensor middle shell, support and the potential electrode of the embodiment of the present invention;
Fig. 4 is the assembly structure figure of cap in the gas sensor of the embodiment of the present invention, stopper and the first breathing waterproof film;
Fig. 5 is the partial enlarged drawing of the gas sensor middle shell of the embodiment of the present invention.
Embodiment
Below in conjunction with specific embodiments and the drawings, the invention will be further described, but should not limit the scope of the invention with this.
Fig. 1 shows the sectional structure chart of the gas sensor of the present embodiment, this gas sensor mainly comprises: housing 122, cap 124, support 127, stopper 125, potential electrode 112, the first imbibition material layer 144a, to electrode 114, comprise the second imbibition material layer 144b, contrast electrode 116, the first breathing waterproof film 142a, the second breathing waterproof film 142b, dustproof membrane 126, the 3rd breathing waterproof film 142c in addition.
Wherein, the material of housing 122, cap 124, support 127 and stopper 125 can be plastics.The profile of housing 122 is cylindrical or is similar to cylindrically, and the gas sensor of the present embodiment external diameter after assembling completes is about 10mm, is highly about 6mm.
The top of housing 122 is opened wide, and bottom has flange, and also has the pore 128 running through on the region inner housing diapire that surrounds of this flange; Potential electrode 112 is arranged in the region of flange encirclement, and extraneous gas can arrive potential electrode 112 by kapillary 128.
In the present embodiment, be provided with the second breathing waterproof film 142b in housing 122 bottom outer wall, the arranged outside of the second breathing waterproof film 142b has dustproof membrane 126; In addition, simultaneously in conjunction with Fig. 2, be also provided with the 3rd breathing waterproof film 142c in the bottom interior wall of housing 122, on the 3rd breathing waterproof film 142c, have catalyzer 118, potential electrode 112 loads on the 3rd breathing waterproof film 142c.
Extraneous gas arrives potential electrode 112 by dustproof membrane 126, the second breathing waterproof film 142b, kapillary 128, the 3rd breathing waterproof film 142c and catalyzer 118 successively.Wherein, the 3rd breathing waterproof film 142c plays the effect of sealing on the one hand, prevents that the electrolytic solution of gas sensor inside from leaking in pore 128, makes on the other hand gas can diffuse to potential electrode 112.The second waterproof ventilated membrane 142b anti-sealing of one side or other materials enter pore 128 and pore 128 are stopped up from external environment condition, can make on the other hand extraneous gas can see through the second waterproof ventilated membrane 142b and enter in pore 128.Dustproof membrane 126 is positioned on the lateral wall of the second breathing waterproof film 142b, and for preventing that dust and other particulate pollutants from entering gas sensor, protection working electrode 112 is not contaminated.
Wherein, dustproof membrane 126 can adopt the materials such as polypropylene or polyester to make, and the second breathing waterproof film 142b and the 3rd breathing waterproof film 142c can adopt Teflon or other suitable materials to make.
The top of support 127 and bottom-open, coordinate with the flange seal of housing 122 bottoms, and potential electrode 112 is clamped between housing 122 and support 127.In conjunction with Fig. 3, support 127 coordinates with the flange seal of housing 122 bottoms simultaneously, potential electrode 112 is clamped in the region of flange encirclement.Support 127 is fixing by potential electrode 112 on the one hand, adopt on the other hand friction tight mode to play sealing function, electrolytic solution can not infiltrated in kapillary 128 and kapillary 128 is stopped up, potential electrode 112 and reservoir 150 can be isolated in addition, thereby prevent that the gas that electrode 114 is produced from arriving potential electrode and making distorted signals.
Still with reference to figure 3, on the sidewall of the present embodiment medium-height trestle 127, there are a plurality of grooves, between adjacent notches, there is teat.Wherein, groove can be convenient to conductor wiring, the wire connected from the Different electrodes of gas sensor can be in different grooves cabling, reduce the short-circuit risks between wire, be convenient in addition the reservoir 150 that imbibition material layer depth enters surrounding, the electrolyte content of balance reservoir 150 and center section.Teat can play the effect of location, is convenient to install imbibition material layer, contrast electrode 116, to parts such as electrodes 114.
The first imbibition material layer 144a, contrast electrode 116, the second imbibition material layer 144b and electrode 114 is successively set in support 127, afterwards stopper 125 is filled in from support 127 tops uncovered, by the first imbibition material layer 144a, contrast electrode 116, the second imbibition material layer 144b with electrode 114 is clamped between support 127 and stopper 125.The first imbibition material layer 144a and the second imbibition material layer 144b can be glass microfiber paper, and stopper 125 has venthole 154.
In conjunction with Fig. 1 and Fig. 4, between cap 124 and the top of housing 122, for removably connecting, cap 124 has opening, and this is opened on stopper 125 and is sealed and matched.After being mounted with, the opening of cap 124 communicates with the venthole 154 of stopper 125.Support 127, housing 122 and cap 124 surround reservoir 150 jointly, wherein can be filled with electrolytic solution.
In addition, be provided with the first breathing waterproof film 142a between the opening of cap 124 and venthole 154, the first breathing waterproof film 142a is gripped jointly by cap 124, stopper 125 and support 127.The first breathing waterproof film 142a can prevent that moisture from entering venthole 154.The material of the first breathing waterproof film 142a also can be made by materials such as Teflon.The first breathing waterproof film 142a can prevent that electrolytic solution is leaked in venthole 154 on the one hand, play sealing function, a part of the first breathing waterproof film 142a stretches in reservoir 150 on the other hand, can make rapidly gas sensor inside and outside pressure and environment reach balance, thereby can not affect the response performance of gas sensor.
Adopt stopper 125 that the first breathing waterproof film 142a is fixed on cap 124, assembling is simple, use friction tight mode to realize fixing the first breathing waterproof film 142a, compare with traditional O-ring seal, sealing means by waterproof ventilated membrane hot melt on working of plastics, the fixed form of the present embodiment is conducive to simplify assembly technology.
Fig. 5 shows the partial enlarged drawing of the housing 122 of the present embodiment, with reference to figure 5, has via hole 130 on the sidewall of housing 122, and wire 132 is connected through this via hole and each electrode in gas sensor (potential electrode, contrast electrode with to electrode).Adopt the mode that forms via hole 130 on sidewall can improve the reliability of control leakage, by controlling the size of via hole 130, be convenient to seal; And compare from the shell wall mode that enters gas sensor inside that detours with wire 132 conventional in prior art, the cable run distance of wire 132 is less, and because wire 132 adopts the noble metals such as platinum filament conventionally, reducing cable run distance can reduce costs.
As a nonrestrictive example, the gas sensor in the present embodiment is oxygen sensor.Still with reference to figure 1, oxygen diffuses to potential electrode 112 by pore 128, and at potential electrode 112 places, oxygen is caught from the electronics to electrode 114, and is combined with hydrogen ion, reduction reaction occurs and generate hydrone, and reduction reaction is as follows:
O
2+4H
++4e
-→2H
2O (1)
On the other hand, to electrode 114 places, hydrone is decomposed, and produces hydrogen ion and electronics, and electrolytic process is as follows:
2H
2O→4H
++O
2+4e
- (2)
In addition, oxygen electrode 114 places being produced is diffused into gas sensor outside by venthole 154.Because reaction equation (1) and (2) are balances, thereby the reaction in oxygen sensor is the water at electrode 114 places to be converted to the water at potential electrode 112 places, the oxygen at potential electrode 112 places is converted to the oxygen to electrode 114 places, thereby this oxygen sensor also can be called " oxygen pump ".In addition, electronics is discharging electrode 114 places, and in potential electrode, 112 places catch, and hydrogen ion is from electrode 114 is moved to potential electrode 112 by imbibition material layer, and imbibition material layer can stop again the oxygen at electrode 114 places is diffused to potential electrode 112.
It should be noted that, although be to take oxygen sensor as example describes, it will be appreciated by those skilled in the art that the gas sensor configuration of the present embodiment can also be applicable to other gas sensors.
To sum up, the structure of the present embodiment gas sensor is of value to miniaturization, life-span length, compact conformation, leakproof fluidity are good, the wide humidity that can conform changes, can rapidly set up effective pressure equilibrium with environment, prevent from that pressure from changing the destruction of gas sensor so that the signal that affects gas sensor are exported.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can make possible change and modification, so protection scope of the present invention should be as the criterion with the scope that the claims in the present invention were defined.
Claims (9)
1. a gas sensor, is characterized in that, comprising:
Housing, its top is opened wide, bottom has flange, in the shell bottom wall in the region that described flange surrounds, has the pore running through;
Potential electrode, is arranged in the region of described flange encirclement, and extraneous gas arrives described potential electrode by described pore;
The support of top and bottom-open, coordinates with described flange seal, and described potential electrode is clamped between described flange and support;
Be arranged in described support to electrode, described to being provided with the first imbibition material layer between electrode and potential electrode;
The stopper with venthole, described the first imbibition material layer and electrode is clamped between described support and stopper;
Be provided with the cap of opening, the top of described cap and described housing is for removably connecting, and is sealed and matched between described opening and described stopper, and described opening communicates with described venthole.
2. gas sensor according to claim 1, is characterized in that, between the opening of described cap and the venthole of described stopper, is provided with the first breathing waterproof film.
3. gas sensor according to claim 1, is characterized in that, is provided with the second breathing waterproof film in the bottom outer wall of described housing, and extraneous gas enters described pore by described the second breathing waterproof film.
4. gas sensor according to claim 3, is characterized in that, described the second breathing waterproof film outside is also provided with dustproof membrane, and extraneous gas enters described pore by described dustproof membrane and the second breathing waterproof film successively.
5. gas sensor according to claim 1, is characterized in that, also comprises:
Contrast electrode, is positioned on described the first imbibition material layer;
The second imbibition material layer, is positioned on described contrast electrode, described electrode is positioned on described the second imbibition material layer.
6. gas sensor according to claim 1, is characterized in that, on the sidewall of described housing, is formed with via hole, wire through described via hole and described potential electrode with electrode is connected.
7. gas sensor according to claim 1, is characterized in that, has a plurality of grooves on the sidewall of described support, has teat between adjacent notches.
8. gas sensor according to claim 1, it is characterized in that, under described potential electrode, be also provided with the 3rd breathing waterproof film and catalyzer on the inwall of described housing bottom, extraneous gas is by described pore and the 3rd breathing waterproof film and arrive described potential electrode via described catalyzer.
9. gas sensor according to claim 1, is characterized in that, described support, housing and cap surround reservoir, in described reservoir, is filled with electrolytic solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210081281.9A CN102636542B (en) | 2012-03-23 | 2012-03-23 | Gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210081281.9A CN102636542B (en) | 2012-03-23 | 2012-03-23 | Gas sensor |
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| CN102636542A CN102636542A (en) | 2012-08-15 |
| CN102636542B true CN102636542B (en) | 2014-02-26 |
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| EP2881920B1 (en) * | 2013-12-09 | 2016-11-30 | Siemens Schweiz AG | Smoke-detection assembly including redundant detectors |
| CN105980843B (en) * | 2014-02-12 | 2019-01-01 | 霍尼韦尔国际公司 | The gas sensor of the structure of the loss of signal caused by with resisting because of condensation |
| CN104267146B (en) * | 2014-08-28 | 2016-03-02 | 西红柿科技（武汉）有限公司 | A kind of gas monitoring instrument and system |
| WO2017014852A1 (en) * | 2015-07-22 | 2017-01-26 | Honeywell International Inc. | Breather slots and venting reservoir |
| WO2017128280A1 (en) * | 2016-01-29 | 2017-08-03 | Honeywell International Inc. | Method for decreasing baseline under high temperature of gas sensor |
| CN109789366B (en) * | 2016-10-05 | 2022-07-08 | 霍尼韦尔国际公司 | Dust-proof and splash-proof filter |
| CN107727707A (en) * | 2017-10-19 | 2018-02-23 | 广东美的制冷设备有限公司 | Gas sensor and its preparation technology and airhandling equipment |
| CN108333235A (en) * | 2018-04-24 | 2018-07-27 | 郑州迪邦科技有限公司 | Gas analyzer shell and the gas analyzer for using the shell |
| CN111366682B (en) * | 2020-03-10 | 2022-07-26 | 广东小天才科技有限公司 | Calibration method and device of gas sensor, electronic equipment and storage medium |
| CN113295755B (en) * | 2021-05-18 | 2022-11-29 | 中国科学院合肥物质科学研究院 | A Sampling Type Rapid Primary Battery Oxygen Sensor |
| CN116794144B (en) * | 2023-06-06 | 2024-09-24 | 深圳市道合顺传感实业有限公司 | Electrochemical oxygen sensor and preparation method thereof |
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| JP2002357585A (en) * | 2001-06-01 | 2002-12-13 | Shimadzu Corp | Gas sensor |
| CN101275923B (en) * | 2007-03-26 | 2013-04-10 | 华瑞科学仪器(上海)有限公司 | Gas sensor |
| CN102109483A (en) * | 2009-12-25 | 2011-06-29 | 郑州炜盛电子科技有限公司 | Electrochemical gas sensor |
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