CN103217464B - A kind of gas sensor - Google Patents
A kind of gas sensor Download PDFInfo
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- CN103217464B CN103217464B CN201310094268.1A CN201310094268A CN103217464B CN 103217464 B CN103217464 B CN 103217464B CN 201310094268 A CN201310094268 A CN 201310094268A CN 103217464 B CN103217464 B CN 103217464B
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Abstract
The invention discloses a kind of gas sensor, mainly comprise shell, be nested in the interior cup of described enclosure, from up to down be arranged on the inner and working electrode insulated each other of described interior cup, contrast electrode and to electrode, and coordinate and be arranged on described interior cup bottom inside and the electrolytic solution liquid storage lid being positioned at described base part.Gas sensor of the present invention, can overcome easy-to-leak liquid in prior art, large, the perishable pin of workload and the profile defect such as unsightly, to realize the advantage of not easy-to-leak liquid, little, the not perishable pin of workload and good looking appearance.
Description
Technical field
The present invention relates to sensor technical field, particularly, relate to a kind of gas sensor.
Background technology
Toxic gas such as carbon monoxide, sulfuretted hydrogen etc. are harmful to health, and the concentration therefore detecting them in the environment being easy to contact these poison gases is very important.The kind of sensor detecting concentration of toxic gases has a lot, as semiconductor type sensor, electrochemical sensor, optical-fiber type sensor and catalytic combustion-type sensor.In the sensor, electrochemical gas sensor, because it is accurate, sensitive, reliable and stable, response rapid, has become international mainstream sensor, at present mainly for detection of ppm(1,000,000/) concentration level toxic gas.
The inner structure of electrochemical sensor is very accurate, and manufacture difficulty is quite large, only has a few countries and company to produce at present.Typical electrochemical sensor by working electrode, form electrode and contrast electrode, and is separated (see Fig. 1) by a thin electrolyte layers.In FIG, this electrochemical poison gas sensor comprises plastic casing 9, parallel be arranged on ventilated membrane 2 within plastic casing 9, working electrode 3, contrast electrode 4 and to electrode 5, be arranged on the O RunddichtringO 11 between ventilated membrane 2 and working electrode 3, be separately positioned between working electrode 3 and contrast electrode 4 and contrast electrode 4 and to the barrier film 10 between electrode 5, and the electrolytic solution storage area be arranged on below to electrode 5, electrolytic solution storage area can be added a cover electrolytic solution liquid storage lid 6.Offer gas diffusion paths 1 at the roof of plastic casing 9, offer the liquid injection port 8 matched with the opening on electrolytic solution liquid storage lid 6 at the diapire of plastic casing 9.In the bottom outside of plastic casing, be provided with respectively with working electrode 3, contrast electrode 4 and three metal pins 7 that electrode 5 is connected.
The similar fuel cell of basic functional principle of electrochemical gas sensor, with the porous diffusion film containing noble metal (as platinum black) as working electrode.Gas is first through transducer tip aperture, diffuse to hydrophobic barrier, final arrival working electrode surface, working electrode catalytic decomposition diffuses into gas in sensor, obtains electronics, electron stream forms current return to electrode, this electric current is directly proportional to the gas concentration entered in sensor, and measuring this electric current can determine gas concentration.The catalytic reaction that the electrode material designed for tested gas makes working electrode occur can be oxidation mechanism, also can be reduction mechanism.
Electrolyte solution (mostly being caustic acid, alkali or salt solusion) is marked with in the cavity of sensor, these electrolyte solution parts are adsorbed on barrier film, a part is stored in a cavity of sensor base, normally one tips upside down on the vinyl cover subtype of outer casing bottom, is called electrolytic solution liquid storage lid (see Fig. 1).Three electrodes only have fully infiltration in electrolytic solution, and above-mentioned electrochemical reaction could normally occur.
Manufacturing the technological process of electrochemical sensor is: a little opening (diameter is approximately 1 ~ 3mm) is left in the bottom of sensor outer housing, is called liquid injection port.After other parts of sensor all assemble, with syringe and syringe needle, a certain amount of electrolytic solution is injected sensor internal from the liquid injection port of outer casing bottom, then liquid injection port is sealed up.In order to prevent electrolyte solution from spilling sensor, the sealing of liquid injection port is vital.
In the prior art, liquid injection port be sealed with following several mode:
(1) use a kind of glue, as epoxy resin or light-sensitive emulsion, be packed in liquid injection port, after solidification, liquid injection port sealed;
(2) use a cylindrical plastic stopper, embed liquid injection port, surface reinforces with glue after scabbling again;
(3) use a sequin plastic sheeting, be attached to liquid injection port outside surface, the mode (similar heat-sealing plastic bag mouth) of reusable heat pressure, is enclosed in plastic sheeting in liquid injection port.
But realizing in process of the present invention, inventor finds that prior art at least exists following defect:
(1) easy-to-leak liquid: rubber seal is the bonding between two kinds of different materials in essence, the phenomenon such as easily occur gap, come unstuck and produce leakage; Plastic stopper embeds, scabble, use the method for adhesive curing, easily produces the not close and phenomenon of leakage of shutoff; Though the method for disk plastic sheeting hot pressing is comparatively reliable, also often there is film separation and the phenomenon of leakage;
(2) workload is large: rubber seal is comparatively large from technique workload, and plastic stopper embeds, it is artificial to scabble, use the method consumption of adhesive curing;
(3) perishable pin: electrolytic solution liquid storage lid directly tips upside down on bottom sensor outer housing, electrolytic solution can penetrate into bottom and touch metal pins from the gap of sensor outer housing and liquid storage lid, pin generation corrosion phenomenon thus affect sensor performance;
(4) profile unsightly: the liquid injection port outward appearance of prior art sealing is poor.
Summary of the invention
The object of the invention is to, for the problems referred to above, propose a kind of gas sensor, particularly, is a kind of electrochemical gas sensor, to realize the advantage of not easy-to-leak liquid, little, the not perishable pin of workload and good looking appearance.
For achieving the above object, the technical solution used in the present invention is: a kind of gas sensor, mainly comprise shell, be nested in the interior cup of described enclosure, from up to down be arranged on the inner and working electrode insulated each other of described interior cup, contrast electrode and to electrode, and coordinate and be arranged on described interior cup bottom inside and the electrolytic solution liquid storage lid being positioned at described base part.
Further, offer hole at described outer casing bottom, be provided with tubule in described interior bottom portion; Described tubule stretches out outwardly from outer casing bottom, can as liquid injection port;
During assembling, first described interior cup is put into shell, make the hole of the embedding of the tubule bottom interior cup outer casing bottom, stretch out outwardly from outer casing bottom; Again described electrolytic solution liquid storage lid is put into bottom cup, after all parts of this gas sensor have all assembled, using described tubule as liquid injection port, in this gas sensor, inject electrolytic solution; Then by pressure sintering, liquid injection port is closed.
Further, this gas sensor also comprises for drawing described working electrode, contrast electrode and three conductive wires to electrode generation current respectively; Described three conductive wires, the formula that pastes respectively is connected to described working electrode, contrast electrode and the surface to electrode.
Further, described conductive wire, comprises platinum filament.
Further, this gas sensor also comprises and is positioned at described enclosure and the ventilated membrane be arranged on above described working electrode.
Further, between described ventilated membrane and working electrode, coordinate and O RunddichtringO is installed.
Further, this gas sensor also comprises and is separately positioned between described working electrode and contrast electrode and contrast electrode and to the dielectric film between electrode.
Further, offer for the gas diffusion paths to ventilated membrane injecting gas at the roof of described shell, and/or, in the bottom wall outer of described shell, and three metal pins be connected with three conductive wires respectively.
The gas sensor of various embodiments of the present invention, owing to mainly comprising shell, be nested in the interior cup of enclosure, from up to down be arranged on the inner and working electrode insulated each other of interior cup, contrast electrode and to electrode, and coordinate and be arranged on interior cup bottom inside and the electrolytic solution liquid storage lid being positioned at base part; Like this, by cup in increase between shell and electrolytic solution liquid storage lid, electrolytic solution can not penetrate in the gap between shell and interior cup, thus by completely isolated for the metal pins of electrolytic solution and outer casing bottom, eliminates the Corrosion Potential of pin; Thus easy-to-leak liquid in prior art, large, the perishable pin of workload and the inaesthetic defect of profile can be overcome, to realize the advantage of not easy-to-leak liquid, little, the not perishable pin of workload and good looking appearance.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from instructions, or understand by implementing the present invention.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for instructions, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the inner structure schematic diagram of electrochemical poison gas sensor;
Fig. 2 is the inner structure schematic diagram of gas sensor of the present invention;
Fig. 3 a is the top perspective view of gas sensor housing of the present invention;
Fig. 3 b is the elevated bottom perspective structural representation of gas sensor housing of the present invention;
Fig. 4 a is the top perspective view of interior cup in gas sensor of the present invention;
Fig. 4 b is the elevated bottom perspective structural representation of interior cup in gas sensor of the present invention;
Fig. 5 a is the top perspective view of liquid storage lid in gas sensor of the present invention;
Fig. 5 b is the elevated bottom perspective structural representation of liquid storage lid in gas sensor of the present invention;
Fig. 6 a and Fig. 6 b is the longitudinal sectional structure schematic diagram in embedding in the shell of gas sensor of the present invention after cup and liquid storage lid;
Fig. 6 c is the elevated bottom perspective structural representation in embedding in gas sensor housing of the present invention after cup and liquid storage lid;
Fig. 7 a is the longitudinal sectional structure schematic diagram of gas sensor of the present invention after hot pressing is closed;
Fig. 7 b is the elevated bottom perspective structural representation of gas sensor of the present invention after hot pressing is closed.
By reference to the accompanying drawings, in the embodiment of the present invention, Reference numeral is as follows:
1-gas diffusion paths; 2-ventilated membrane; 3-working electrode; 4-contrast electrode; 5-is to electrode; 6-electrolytic solution liquid storage lid; 7-metal pins (respectively with three, inside electrode is connected); 8-liquid injection port; 9-plastic casing; 10-barrier film; 11-O RunddichtringO; Cup in 12-.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
According to the embodiment of the present invention, provide a kind of gas sensor, the problem of the easy leakage of sensor can be solved, solve sensor metal pins to be easily corroded the problem of getting rusty, be more prone to manufacture, can enhance productivity, sensor profile can be made more attractive in appearance.
As shown in Fig. 2-Fig. 7 b, the gas sensor of the present embodiment, mainly comprise shell (as plastic casing 9), be nested in the interior cup of enclosure, from up to down be arranged on the inner and working electrode insulated each other (as working electrode 3) of interior cup, contrast electrode (as contrast electrode 4) and to electrode (as to electrode 5), and coordinate and be arranged on interior cup bottom inside and the electrolytic solution liquid storage lid (as electrolytic solution liquid storage lid 6) being positioned at base part.Offer hole at outer casing bottom, be provided with tubule in interior bottom portion; Tubule stretches out outwardly from outer casing bottom, can as liquid injection port (can play the effect of liquid injection port 8); During assembling, first interior cup is put into shell, make the hole of the embedding of the tubule bottom interior cup outer casing bottom, stretch out outwardly from outer casing bottom; Again electrolytic solution liquid storage lid is put into bottom cup, after all parts of this gas sensor have all assembled, using tubule as liquid injection port, in this gas sensor, inject electrolytic solution; Then by pressure sintering, liquid injection port is closed.
In the above-described embodiments, this gas sensor also comprises for drawing working electrode, contrast electrode and three conductive wires to electrode generation current respectively, be positioned at enclosure and be arranged on the ventilated membrane (as ventilated membrane 2) above working electrode, being separately positioned between working electrode and contrast electrode and contrast electrode and to the dielectric film (can be barrier film 10) between electrode; Three conductive wires, the formula that pastes respectively is connected to working electrode, contrast electrode and the surface to electrode, and conductive wire, comprises platinum filament; Between ventilated membrane and working electrode, coordinate and O RunddichtringO (as O RunddichtringO 11) is installed; Offer for the gas diffusion paths (as gas diffusion paths 1) to ventilated membrane diffusion gas at the roof of shell, and/or, in the bottom wall outer of shell, and three metal pins (as metal pins 7) be connected with three conductive wires respectively.
In the present embodiment, when specifically implementing, can only improve the polycrystalline substance of gas sensor, can see Fig. 3 a-Fig. 7 b; Top structure about gas sensor can see Fig. 2 and related description thereof.
In the present embodiment, the polycrystalline substance of gas sensor, primarily of shell (as plastic casing 9), interior cup and liquid storage lid (i.e. electrolytic solution liquid storage lid 6) three part composition, is shown in Fig. 3 a, Fig. 3 b, Fig. 4 a, Fig. 4 b, Fig. 5 a, Fig. 5 b respectively.These sensor parts are all made by die sinking, injection moulding.
During assembling, first interior cup is put into plastic casing, make the tubule bottom interior cup embed the hole bottom plastic casing and stretch out from bottom outwardly, and then put into liquid storage lid, as shown in figures 6 a and 6b.In stretching out bottom plastic casing, cup tubule is liquid injection port.
After the miscellaneous part of above-mentioned gas sensor has all assembled, then electrolyte solution (i.e. electrolytic solution) is injected by liquid injection port, then by the method for hot pressing, liquid injection port is closed.Hot pressing close after liquid injection port as shown in figs. 7 a and 7b.
The gas sensor of the various embodiments described above, can including, but not limited to the sensor of these gases: carbon monoxide (CO), sulfuretted hydrogen (H
2s), ammonia (NH
3), oxygen (O
2), nitrogen monoxide (NO), nitrogen dioxide (NO
2), sulphuric dioxide (SO
2), hydrogen (H
2), chlorine (Cl
2), hydrogen chloride (HCl), ozone (O
3), combustible gas (HC) etc.
The gas sensor of the various embodiments described above, the fields such as the safety detection of the industries such as petroleum gas production, chemical plant, chemical fertilizer production, communal facility, wastewater treatment, papermaking (slurry) factory, pharmacy, food and drink, automobile, electroplating processes, mining, military affairs, environment monitoring and production run control can be widely used in, for detecting the content of certain gas in air.
The gas sensor of the various embodiments described above, with prior art as epoxy resin rubber seal, stopper embed, compared with the seal approach of the mode such as film hot-pressing, the effect after the sealing of this gas sensor is more smooth, attractive in appearance, at least can reach following beneficial effect:
(1) hot sealing completes between otherwise identical plastic parts, and sealing property is very reliable, excellent, completely eliminates leakage hidden danger;
(2) owing to adding cup between shell and liquid storage lid, electrolytic solution can not penetrate in the gap between sensor outer housing and interior cup, thus by completely isolated for the metal pins of electrolytic solution and outer casing bottom, eliminates the Corrosion Potential of pin;
(3) heat pressing process is simple, decreases the workload of assembling, improves production efficiency.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a gas sensor, it is characterized in that, mainly comprise shell, be nested in the interior cup of described enclosure, from up to down be arranged on the inner and working electrode insulated each other of described interior cup, contrast electrode and to electrode, and coordinate and be arranged on described interior cup bottom inside and be positioned at the electrolytic solution liquid storage lid to base part;
This gas sensor also comprises for drawing described working electrode, contrast electrode and three conductive wires to electrode generation current respectively; Described three conductive wires, the formula that pastes respectively is connected to described working electrode, contrast electrode and the surface to electrode;
This gas sensor also comprises and is separately positioned between described working electrode and contrast electrode and contrast electrode and to the dielectric film between electrode;
Offer hole at described outer casing bottom, bottom described interior cup, be provided with tubule;
During assembling, first interior cup is put into plastic casing, make the tubule bottom interior cup embed the hole bottom plastic casing and stretch out bottom plastic casing outwardly, and then put into bottom cup by liquid storage lid, in stretching out bottom plastic casing, cup tubule is liquid injection port; After the miscellaneous part of above-mentioned gas sensor has all assembled, then electrolyte solution is injected by liquid injection port, then by the method for hot pressing, liquid injection port is closed;
Hot sealing completes between otherwise identical plastic parts, completely eliminates leakage hidden danger; In the gap that between shell and liquid storage lid, cup makes electrolytic solution can not penetrate between sensor outer housing and interior cup, thus by completely isolated for the metal pins of electrolytic solution and outer casing bottom.
2. gas sensor according to claim 1, is characterized in that, described conductive wire comprises platinum filament.
3. gas sensor according to claim 1, is characterized in that, also comprises and is positioned at described enclosure and the ventilated membrane be arranged on above described working electrode.
4. gas sensor according to claim 3, is characterized in that, between described ventilated membrane and working electrode, coordinates and is provided with O RunddichtringO.
5. gas sensor according to claim 3, is characterized in that, offers for the gas diffusion paths to ventilated membrane injecting gas at the roof of described shell.
6. the gas sensor according to claim 1 or 3 or 5, is characterized in that, is also included in the bottom wall outer of described shell and three metal pins be connected with three conductive wires respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310094268.1A CN103217464B (en) | 2013-03-22 | 2013-03-22 | A kind of gas sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310094268.1A CN103217464B (en) | 2013-03-22 | 2013-03-22 | A kind of gas sensor |
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| Publication Number | Publication Date |
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| CN103217464A CN103217464A (en) | 2013-07-24 |
| CN103217464B true CN103217464B (en) | 2016-03-23 |
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| CN201310094268.1A Expired - Fee Related CN103217464B (en) | 2013-03-22 | 2013-03-22 | A kind of gas sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105891301B (en) * | 2016-04-21 | 2019-04-16 | 长沙三相医疗器械有限公司 | The method of ammonia level in the system for diagnosing human body helicobacter pylori infections and detection people's expiratory air established based on fuel cell |
| CN109270146B (en) * | 2018-09-29 | 2022-11-01 | 荆州市爱尔瑞科技有限公司 | Electrochemical chlorine sensor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2886565Y (en) * | 2005-12-30 | 2007-04-04 | 中国科学院长春应用化学研究所 | Electrochemical poison gas sensor |
| CN201034970Y (en) * | 2007-03-23 | 2008-03-12 | 张桂芝 | Electrochemistry gas sensors |
| CN101567426A (en) * | 2009-06-01 | 2009-10-28 | 彩虹集团公司 | Method for sealing hole of counter electrode of battery |
| CN102109483A (en) * | 2009-12-25 | 2011-06-29 | 郑州炜盛电子科技有限公司 | Electrochemical gas sensor |
| CN102130365A (en) * | 2011-01-30 | 2011-07-20 | 康图强 | Laminated type lithium battery core body with extremely high bearing capacity and packaging technique |
| CN203117152U (en) * | 2013-03-22 | 2013-08-07 | 无锡高顿传感技术有限公司 | Novel gas sensor |
-
2013
- 2013-03-22 CN CN201310094268.1A patent/CN103217464B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2886565Y (en) * | 2005-12-30 | 2007-04-04 | 中国科学院长春应用化学研究所 | Electrochemical poison gas sensor |
| CN201034970Y (en) * | 2007-03-23 | 2008-03-12 | 张桂芝 | Electrochemistry gas sensors |
| CN101567426A (en) * | 2009-06-01 | 2009-10-28 | 彩虹集团公司 | Method for sealing hole of counter electrode of battery |
| CN102109483A (en) * | 2009-12-25 | 2011-06-29 | 郑州炜盛电子科技有限公司 | Electrochemical gas sensor |
| CN102130365A (en) * | 2011-01-30 | 2011-07-20 | 康图强 | Laminated type lithium battery core body with extremely high bearing capacity and packaging technique |
| CN203117152U (en) * | 2013-03-22 | 2013-08-07 | 无锡高顿传感技术有限公司 | Novel gas sensor |
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| CN103217464A (en) | 2013-07-24 |
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