CN111413387A - Electrochemical gas sensor and electrode package thereof - Google Patents
Electrochemical gas sensor and electrode package thereof Download PDFInfo
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- CN111413387A CN111413387A CN202010357502.5A CN202010357502A CN111413387A CN 111413387 A CN111413387 A CN 111413387A CN 202010357502 A CN202010357502 A CN 202010357502A CN 111413387 A CN111413387 A CN 111413387A
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Abstract
The invention provides an electrochemical gas sensor and an electrode package thereof. The device comprises a substrate (1), a support piece (2), an electrode (3), a ventilation plate (4) and a plastic scribing buckle (5); the substrate (1) is positioned at the bottom of the sensor and connected with the support piece (2), the electrode (3) is placed in the support piece (2), and the air-permeable plate (4) is installed above the support piece (2) and fixed by the plastic scribing buckle (5). The electric conduction structure is characterized in that five conducting holes are formed in the corresponding positions of the substrate (1) and the electrode (3), and a metal thimble fixed on the electrode (3) penetrates through the conducting holes in the corresponding positions of the substrate (1) and the electrode (3) to realize electric conduction.
Description
Technical Field
The invention belongs to the field of electrochemical sensors, and particularly relates to an electrochemical gas sensor and an electrode package thereof.
Background
With the rapid development of society and the improvement of safety awareness of people, gas sensors have been widely used in various fields. From the type of gas sensor, the gas sensor may be classified into a chemical type gas sensor, such as a semiconductor type, a catalytic combustion type, an electrochemical type, and the like, and a physical type gas sensor, such as an optoelectronic type, a thermoelectric type, a gas-electric type, and the like. Among them, the electrochemical gas sensor has high sensitivity and good selectivity, so that the electrochemical gas sensor occupies a large market share, and people develop the electrochemical gas sensor more vigorously.
The core of the electrochemical gas sensor is a three-electrode with electrolyte, which comprises a working electrode, a counter electrode and a reference electrode as a comparison reference. After the detected gas diffuses to the working electrode, a series of oxidation (reduction) reactions occur. The magnitude of the current generated by oxidation (reduction) is proportional to the concentration of the gas being measured.
However, the current electrochemical sensor has a short plate with instability, incomplete functions and short service life, which limits the performance and application of the electrochemical sensor, and therefore needs to be solved urgently.
CN201510366015.4 discloses an electrochemical formaldehyde sensor and a method for manufacturing an electrode thereof, wherein the electrochemical formaldehyde sensor comprises a solid electrolyte, a sealing cover and a dustproof and breathable film, and the stability and the service life of the sensor are improved. However, the components of the sensor are made of plastic, adhesive and the like, and gases which interfere with the sensor may be released in a high-temperature environment, so that the test result is influenced; the sensor is packaged in an adhesive mode, so that the sensor is not maintainable.
Therefore, it is necessary to develop an electrochemical gas sensor to solve the above problems.
Disclosure of Invention
The invention aims to provide an electrochemical gas sensor and an electrode thereof.
The electrochemical gas sensor provided by the invention comprises a substrate, a supporting piece, an electrode, a breathable plate and a plastic scribing buckle; the base plate is positioned at the bottom of the sensor and connected with the support piece, the electrode is placed in the support piece, and the air-permeable plate is installed above the support piece and fixed by the plastic scribing buckle.
The electrode is placed in the support piece, and the support piece has a certain height, so that a certain space can be reserved for the solid electrolyte on the surface of the electrode, and the contact of the electrolyte is avoided. The air-permeable plate is provided with a groove at the position corresponding to the electrode, and can be used for installing and fixing the electrode.
Further, one surface of the electrode is filled with a solid electrolyte, the solid electrolyte surface of the electrode faces the substrate, and the non-electrolyte surface of the electrode is in contact with and fixed to the concave surface of the gas permeable plate.
Furthermore, five via holes are arranged at corresponding positions of the substrate and the electrode, wherein three via holes are formed in an electrode area of the electrode and are electrode through holes corresponding to the substrate electrode through holes on the substrate, and the via holes are used for realizing the function of collecting electrochemical signals; the substrate area of the electrode is provided with two conducting holes which are electrode metalized through holes and correspond to the substrate metalized through holes on the substrate, and the electrode heating function is realized.
The ceramic material has the advantages of lower dielectric constant, better insulating property, good thermal stability, low thermal expansion coefficient, good moisture resistance, corrosion resistance and the like, so compared with other materials, the sensor adopts the conventional ceramic material as the sensor substrate and the breathable plate, can improve the reliability and stability of the sensor, and can meet the heating requirement of the electrode.
The supporting piece is made of an aluminum alloy material, so that the manufacturing difficulty is low, the heat conductivity and the corrosion resistance are good, and the production cost of the sensor can be reduced on the premise of ensuring the normal work of the sensor.
Further, the substrate is made of ceramic materials including aluminum oxide, aluminum nitride and glass.
Further, the supporting piece is made of aluminum alloy materials.
Furthermore, the gas permeable plate is made of silicon carbide and is provided with a large number of uniform vent holes.
Furthermore, the sensor also comprises a metal thimble, and the metal thimble penetrates through the substrate and the electrode in the conducting hole; the diameter of the metal thimble is slightly smaller than the conducting hole, so that the metal thimble is electrically conducted with the electrode; the metal thimble is welded and fixed on the electrode.
The electrode of the electrochemical gas sensor provided by the invention comprises a first electrode, a second electrode and a third electrode, wherein an electrolyte covers the surfaces of the three electrodes, and the surfaces of the three electrodes are respectively provided with a through hole which is a through hole of the electrode and is respectively connected with the three electrodes; the first electrode is a counter electrode, the second electrode is a working electrode, the third electrode is a reference electrode, and a large number of uniform vent holes are formed in the first electrode and the second electrode.
Furthermore, the electrode is made of ceramic materials, including aluminum oxide, aluminum nitride, glass, silicon wafers, piezoelectric ceramics, microwave dielectric ceramics and plastic films.
It is another object of the present invention to provide a package for an electrochemical gas sensor, comprising the steps of:
s1, welding and fixing the metal thimble on the electrode, placing the electrode on the air-permeable plate, placing the support part on the electrode and contacting with the air-permeable plate, and then placing the substrate on the support part;
and S2, pushing the components into the plastic scribing buckle for fixing, wherein the metal thimble on the electrode can be connected with an external circuit through the via hole on the substrate to realize the communication of electrical signals.
The invention has the beneficial effects that:
(1) the electrochemical gas sensor does not use adhesive and is not interfered by gas released by the packaging material of the electrochemical gas sensor, so that the authenticity and the stability of the detected data are realized.
(2) The electrochemical gas sensor of the invention does not influence maintenance due to the complex packaging structure, is convenient for cleaning, maintenance, disassembly and assembly replacement, and prolongs the service cycle of the sensor.
(3) The electrochemical gas sensor provided by the invention is provided with a heating function, and can meet the measurement requirements of different gases at different temperatures.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a schematic view of a substrate in an electrochemical gas sensor of the present invention;
FIG. 2 is a schematic cross-sectional view of (a) a front side and (b) a support member in an electrochemical gas sensor of the present invention;
FIG. 3 is a schematic view of an electrode in an electrochemical gas sensor of the present invention;
FIG. 4 is a schematic cross-sectional view of (a) the front side and (b) the gas permeable plate in the electrochemical gas sensor of the present invention;
FIG. 5 is a schematic view of a plastic scribe in an electrochemical gas sensor of the present invention;
FIG. 6 is a schematic diagram of the composition of an electrochemical gas sensor of the present invention;
FIG. 7 is a schematic view of an electrochemical gas sensor of the present invention in its entirety;
fig. 8 is an overall sectional schematic view of an electrochemical gas sensor of the present invention.
Illustration of the drawings:
1. a substrate; 2. a support member; 3. an electrode; 4. a gas permeable plate; 5. plastic buttons are scribed; 6. a substrate electrode through hole; 7. a substrate metallization via; 8. an electrode metallization via; 9. a first electrode; 10. a second electrode; 11. and a third electrode.
Detailed Description
In order that the objects, aspects and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the following detailed description and the accompanying drawings.
Example 1
As shown in fig. 6, the electrochemical gas sensor provided by the present invention comprises a substrate 1, a support 2, an electrode 3, a gas permeable plate 4 and a plastic button 5; the substrate 1 is positioned at the bottom of the sensor and connected with the support 2, the electrode 3 is placed in the support 2, and the air-permeable plate 4 is installed above the support 2 and fixed by the plastic scribing buckle 5.
The substrate is made of alumina ceramic material and is perforated with five through holes, namely an electrode through hole 6 and a metalized through hole 7, as shown in fig. 1.
Wherein the supporting member 2 is made of aluminum alloy material as shown in fig. 2.
As shown in fig. 3, the electrode 3 is made of an alumina ceramic material, and the back of the electrode 3 includes a first electrode 9, a second electrode 10 and a third electrode 11, wherein the first electrode is a counter electrode, the second electrode is a working electrode, and the third electrode is a reference electrode. The electrolyte covers the surface of the three electrodes, a large number of through vent holes are formed in the electrode areas of the first electrode 9 and the second electrode 10, and the gas to be measured on the front surface of the electrode 2 can contact the first electrode 9 and the second electrode 10 on the back surface and the electrolyte on the surface of the three electrodes through the vent holes. The three electrodes have one through hole in each electrode area and are electrically connected to the electrode circuit, while the electrode 3 has two through holes in the substrate area, which are metallized through holes 8 and can be used for heating.
The gas permeable plate 4 is made of silicon carbide microporous ceramic, and has a large number of uniform vent holes on the surface, so that the gas to be measured can enter the contact electrode 2 through the vent holes, as shown in fig. 4.
Wherein the plastic scribe 5 is made of PC/ABS plastic material as shown in FIG. 5.
The positions of the through holes on the substrate 1 correspond to those of the through holes on the electrode 3.
Five metal thimbles run through the substrate 1 and the electrode 3 in five conducting holes, thereby realizing the electrical conduction of the sensor electrode; five metal thimbles are fixed on the electrode 3 by welding.
Example 2
As shown in fig. 7 and 8, the packaging process of the electrochemical gas sensor provided by the invention specifically comprises the following steps:
(1) welding and fixing five metal thimbles on an electrode 3, installing and fixing the electrode 3 on a ventilating plate 4, placing a support piece 2 on the electrode 3 and contacting the ventilating plate 4, and then placing a substrate 1 on the support piece 2;
(2) the components are scratched and pushed into the plastic scratching buckle 5 to be fixed, and the metal thimble on the electrode 3 can be connected with an external circuit through a via hole on the substrate 1, so that the communication of an electric signal is realized.
The gas to be measured enters the electrode chamber of the sensor through the air-permeable plate 4, and then contacts with the back electrode and the electrolyte through the air hole on the electrode 3 to generate electrochemical reaction, and the electrode 3 is connected to the front end circuit and the amplifying circuit of the external sensor through the welding metal thimble to realize data acquisition.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single technical solution, and such description is for clarity only, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be combined appropriately to form other embodiments that those skilled in the art can understand. The technical details not described in detail in the present invention can be implemented by any of the prior arts in the field. In particular, all technical features of the invention which are not described in detail can be achieved by any prior art.
Claims (10)
1. An electrochemical gas sensor, characterized in that the sensor comprises a substrate (1), a support (2), an electrode (3), a gas permeable plate (4) and a plastic button (5); the substrate (1) is positioned at the bottom of the sensor and connected with the support piece (2), the electrode (3) is placed in the support piece (2), and the air-permeable plate (4) is installed above the support piece (2) and fixed by the plastic scribing buckle (5).
2. An electrochemical gas sensor according to claim 1, characterized in that one side of the electrode (3) is filled with a solid electrolyte, the solid electrolyte side of the electrode (3) faces the substrate (1), and the non-electrolyte side of the electrode (3) is in contact with and fixed to the concave side of the gas-permeable plate (4).
3. An electrochemical gas sensor according to claim 1 or 2, characterized in that five through holes are arranged at corresponding positions of the substrate (1) and the electrode (3), wherein three through holes are arranged in the electrode area of the electrode (3) and are electrode through holes corresponding to the substrate electrode through hole (6) on the substrate (1) for realizing the function of collecting electrochemical signals; the electrode is characterized in that two conducting holes are formed in the substrate area of the electrode, are electrode metalized through holes (8) and correspond to the substrate metalized through holes (7) on the substrate (1), and are used for achieving an electrode heating function.
4. An electrochemical gas sensor according to claim 1, characterized in that the substrate (1) is made of a ceramic material, including alumina, aluminum nitride, glass.
5. An electrochemical gas sensor according to claim 1, characterized in that the support (2) is made of an aluminium alloy material.
6. An electrochemical gas sensor according to claim 1, characterized in that the gas-permeable plate (4) is made of silicon carbide and is provided with a large number of uniform gas-permeable holes.
7. An electrochemical gas sensor according to claim 1 or 2, further comprising metal pins through which said substrate (1) and said electrodes (3) are conducted; the diameter of the metal thimble is slightly smaller than the conducting hole, so that the metal thimble is electrically conducted with the electrode (3); the metal thimble is welded and fixed on the electrode (3).
8. An electrode of an electrochemical gas sensor according to claim 1 or 2, wherein the electrode (3) comprises a first electrode (9), a second electrode (10) and a third electrode (11), an electrolyte is coated on the surface of the three electrodes, and a via hole is formed on each surface of the three electrodes, is a through hole of the electrode and is respectively connected with the three electrodes; the first electrode (9) is a counter electrode, the second electrode (10) is a working electrode, the third electrode (11) is a reference electrode, and a large number of uniform vent holes are formed in the first electrode (9) and the second electrode (10).
9. The electrode of an electrochemical gas sensor according to claim 8, characterized in that the electrode (3) is made of ceramic material, including alumina, aluminum nitride, glass, silicon wafer, piezoelectric ceramic, microwave dielectric ceramic, plastic film.
10. A package for an electrochemical gas sensor according to claim 1, comprising the steps of:
s1, welding and fixing the metal thimble on the electrode (3), placing the electrode (3) on the air-permeable plate (4), placing the support (2) on the electrode (3) and contacting with the air-permeable plate (4), and then placing the substrate (1) on the support (2);
and S2, pushing the components into the plastic scribing buckle (5) for fixing, wherein the metal thimble on the electrode (3) can be connected with an external circuit through a via hole on the substrate (1) to realize the communication of an electric signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010357502.5A CN111413387A (en) | 2020-04-29 | 2020-04-29 | Electrochemical gas sensor and electrode package thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010357502.5A CN111413387A (en) | 2020-04-29 | 2020-04-29 | Electrochemical gas sensor and electrode package thereof |
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| CN111413387A true CN111413387A (en) | 2020-07-14 |
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| CN202010357502.5A Pending CN111413387A (en) | 2020-04-29 | 2020-04-29 | Electrochemical gas sensor and electrode package thereof |
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| US20140083852A1 (en) * | 2012-09-25 | 2014-03-27 | Figaro Engineering Inc. | Electrochemical gas sensor and mounting structure therefor |
| CN104931557A (en) * | 2015-06-29 | 2015-09-23 | 郑州炜盛电子科技有限公司 | Electromechanical formaldehyde sensor and production method of electrode thereof |
| CN206192974U (en) * | 2016-11-16 | 2017-05-24 | 歌尔科技有限公司 | Gas sensor module based on buckle structure shell |
| CN107219287A (en) * | 2017-06-28 | 2017-09-29 | 汉威科技集团股份有限公司 | Ionic liquid electrochemical gas sensor |
| CN109239165A (en) * | 2018-10-30 | 2019-01-18 | 安徽六维传感科技有限公司 | A kind of electrochemical sensor based on Solid-state Ion-exchange |
| CN110554073A (en) * | 2019-07-23 | 2019-12-10 | 广州钰芯传感科技有限公司 | Magnetic attraction type packaged electrochemical gas sensor and packaging method thereof |
| CN210346376U (en) * | 2019-06-26 | 2020-04-17 | 常州红橙彩砂有限公司 | Gas alarm device for sintering color sand kiln |
| CN212904652U (en) * | 2020-04-29 | 2021-04-06 | 广州钰芯传感科技有限公司 | Electrochemical gas sensor and electrode thereof |
-
2020
- 2020-04-29 CN CN202010357502.5A patent/CN111413387A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140083852A1 (en) * | 2012-09-25 | 2014-03-27 | Figaro Engineering Inc. | Electrochemical gas sensor and mounting structure therefor |
| CN104931557A (en) * | 2015-06-29 | 2015-09-23 | 郑州炜盛电子科技有限公司 | Electromechanical formaldehyde sensor and production method of electrode thereof |
| CN206192974U (en) * | 2016-11-16 | 2017-05-24 | 歌尔科技有限公司 | Gas sensor module based on buckle structure shell |
| CN107219287A (en) * | 2017-06-28 | 2017-09-29 | 汉威科技集团股份有限公司 | Ionic liquid electrochemical gas sensor |
| CN109239165A (en) * | 2018-10-30 | 2019-01-18 | 安徽六维传感科技有限公司 | A kind of electrochemical sensor based on Solid-state Ion-exchange |
| CN210346376U (en) * | 2019-06-26 | 2020-04-17 | 常州红橙彩砂有限公司 | Gas alarm device for sintering color sand kiln |
| CN110554073A (en) * | 2019-07-23 | 2019-12-10 | 广州钰芯传感科技有限公司 | Magnetic attraction type packaged electrochemical gas sensor and packaging method thereof |
| CN212904652U (en) * | 2020-04-29 | 2021-04-06 | 广州钰芯传感科技有限公司 | Electrochemical gas sensor and electrode thereof |
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