CN111380931A - Gas sensor - Google Patents
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- CN111380931A CN111380931A CN201811627575.0A CN201811627575A CN111380931A CN 111380931 A CN111380931 A CN 111380931A CN 201811627575 A CN201811627575 A CN 201811627575A CN 111380931 A CN111380931 A CN 111380931A
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- 239000012528 membrane Substances 0.000 claims abstract description 121
- 238000009792 diffusion process Methods 0.000 claims abstract description 81
- 230000014759 maintenance of location Effects 0.000 claims abstract description 37
- 239000007784 solid electrolyte Substances 0.000 claims abstract description 11
- 238000003411 electrode reaction Methods 0.000 claims abstract description 6
- 238000005476 soldering Methods 0.000 claims description 15
- 238000003466 welding Methods 0.000 claims description 8
- 238000003780 insertion Methods 0.000 claims description 7
- 230000037431 insertion Effects 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 230000002209 hydrophobic effect Effects 0.000 claims description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- UQSQSQZYBQSBJZ-UHFFFAOYSA-N fluorosulfonic acid Chemical compound OS(F)(=O)=O UQSQSQZYBQSBJZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000002985 plastic film Substances 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 17
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 15
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 5
- 239000011244 liquid electrolyte Substances 0.000 description 5
- 239000003792 electrolyte Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- 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
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
-
- 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
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/333—Ion-selective electrodes or membranes
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
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- Measuring Oxygen Concentration In Cells (AREA)
Abstract
The gas sensor comprises a shell, a membrane electrode, a moisture retention membrane, a first gas diffusion layer and a control circuit board, wherein the shell is provided with an air inlet, the membrane electrode is arranged in the shell, two opposite side surfaces of the membrane electrode form two electrodes, one side surface of the membrane electrode faces the air inlet, the membrane electrode is a solid electrolyte membrane electrode, the moisture retention membrane is arranged on the other side surface of the membrane electrode, only the first gas diffusion layer is arranged between the moisture retention membrane and the membrane electrode, the gas diffusion layer is used for receiving electrons generated by electrode reaction of the membrane electrode, the control circuit board is arranged outside the shell and connected with the shell, and the control circuit board is electrically connected with the gas diffusion layer. The gas sensor provided by the embodiment of the invention has long service life and is less influenced by the ambient humidity.
Description
Technical Field
The invention relates to the field of air detection equipment, in particular to a gas sensor.
Background
In recent years, with the continuous improvement of living standard and the great abundance of material conditions, people put higher demands on living conditions and living environment, wherein formaldehyde is a monitoring index which is most concerned by people. Therefore, the method has important significance for rapidly and accurately monitoring the formaldehyde in real time. At present, except for some traditional complicated formaldehyde detection methods, the method of a gas sensor is gradually adopted, but most of the existing formaldehyde sensors are liquid electrolytes or semisolid electrolytes, and the problems of potential safety hazards, short service life, complex structural design, great influence of humidity and the like of the sensors limit the application range and popularization of the sensors.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. To this end, the invention proposes a gas sensor which has a long service life and is less affected by humidity.
A gas sensor according to an embodiment of the present invention includes: the air inlet is arranged on the shell; the membrane electrode is arranged in the shell, two opposite side surfaces of the membrane electrode form two electrodes, one side surface of the membrane electrode faces the air inlet, and the membrane electrode is a solid electrolyte membrane electrode; a moisture retention film provided on the other side surface of the membrane electrode; the first gas diffusion layer is arranged between the moisture retention membrane and the membrane electrode, and the control circuit board is arranged outside the shell and connected with the shell and is electrically connected with the gas diffusion layer.
According to the gas sensor provided by the embodiment of the invention, the membrane electrode is the solid electrolyte membrane electrode, and the side, far away from the air inlet, of the membrane electrode is provided with the moisture retention membrane, so that the liquid leakage phenomenon which is often caused by the existing gas sensor with liquid electrolyte or semisolid electrolyte is avoided, the potential safety hazard of the gas sensor provided by the embodiment of the invention is reduced, the service life of the gas sensor is prolonged, meanwhile, the influence of the environmental humidity on the detection result of the gas sensor is also reduced, and the detection precision of the gas sensor is ensured.
In some embodiments, a second gas diffusion layer is disposed between the membrane electrode and the gas inlet.
In some embodiments, the first gas diffusion layer and the second gas diffusion layer are porous hydrophobic conductive layers, the first gas diffusion layer and the second gas diffusion layer can be used for collecting electrons reacted by the membrane electrode, and both the first gas diffusion layer and the second gas diffusion layer are electrically connected with the membrane electrode and the control circuit board.
In some embodiments, the housing comprises: the cover shell is provided with the air inlet at one side, an installation groove communicated with the air inlet is formed at the other side of the cover shell, and the membrane electrode, the moisture retention membrane, the first gas diffusion layer and the second gas diffusion layer are all arranged in the installation groove; and the bottom shell is buckled on the cover shell to seal the mounting groove.
In some specific embodiments, a protrusion is disposed on a side of the cover shell facing the bottom shell, a groove matched with the protrusion is disposed on the bottom shell, and the mounting groove is formed on the protrusion.
In some more specific embodiments, a bottom groove is formed in the bottom wall of the mounting groove, and a plurality of supporting protrusions arranged around the air inlet are arranged in the bottom groove.
In some optional embodiments, the gas sensor further comprises: and the conductive pins are respectively and electrically connected with the control circuit board, the first gas diffusion layer and the second gas diffusion layer so as to transmit the electrons of the membrane electrode reaction collected by the first gas diffusion layer and the second gas diffusion layer to the control circuit board.
In some specific embodiments, the conductive pin includes a plug portion, a soldering portion and a connecting portion, the plug portion, the soldering portion and the connecting portion are respectively formed as a cylinder, the plug portion is plugged into the cover shell, and the soldering portion penetrates through the bottom shell and is soldered on the control circuit board.
In some more specific embodiments, the diameter of the welding part is smaller than that of the insertion part, and the diameter of the insertion part is smaller than that of the connecting part.
In some embodiments, the first gas diffusion layer and the second gas diffusion layer are porous hydrophobic conductive layers.
In some embodiments, the moisture retention film is a porous plastic film, and at least one of sulfuric acid, phosphoric acid, and a perfluorosulfonic acid type polymer solution is stored in the moisture retention film as a moisture retention solution.
In some embodiments, the gas sensor further comprises a waterproof, gas-permeable membrane fitted at the gas inlet.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural view of a gas sensor according to an embodiment of the present invention.
Fig. 2 is an exploded schematic view of a gas sensor according to an embodiment of the present invention.
Fig. 3 is a graph showing changes in humidity of a gas sensor according to an embodiment of the present invention and a conventional gas sensor.
Reference numerals:
a gas sensor 1,
The air-permeable membrane module comprises a shell 10, a cover shell 110, an air inlet 111, a protrusion 112, a mounting groove 1121, a bottom groove 1122, a supporting protrusion 1123, a bottom shell 120, a membrane electrode 20, a moisture-preserving film 30, a first gas diffusion layer 410, a second gas diffusion layer 420, a control circuit board 50, a conductive pin 60, a plug part 610, a connecting part 620, a welding part 630, a metal wire 70 and a waterproof air-permeable membrane 80.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A gas sensor 1 according to an embodiment of the present invention is described below with reference to fig. 1 to 2.
The gas sensor 1 according to the embodiment of the present invention includes a housing 10, a membrane electrode 20, a moisture retention membrane 30, a first gas diffusion layer 410, and a control circuit board 50 (here, the control circuit board 50 refers to the control circuit board of the gas sensor 1), the housing 10 is provided with an air inlet 111, the membrane electrode 20 is disposed in the housing 10, two opposite side surfaces of the membrane electrode 20 form two electrodes, one side surface of the membrane electrode 20 is disposed toward the air inlet 111, the membrane electrode 20 is a solid electrolyte membrane electrode 20, the moisture retention membrane 30 is disposed on the other side surface of the membrane electrode 20, the first gas diffusion layer 410 is disposed between the moisture retention membrane 30 and the membrane electrode 20, the control circuit board 50 is disposed outside the housing 10 and connected to the housing 10, and the control circuit board 50 is electrically.
It can be understood that the membrane electrode 20 of the embodiment of the present invention is the solid electrolyte membrane electrode 20, so that a liquid leakage phenomenon that often occurs in the existing gas sensor using a liquid electrolyte or a semisolid electrolyte is avoided, the potential safety hazard of the gas sensor 1 of the embodiment of the present invention is reduced, and the service life of the gas sensor is prolonged.
It should be noted that, in the embodiment of the present invention, the moisture retention film 30 is disposed on the rear side (the side away from the air inlet 111) of the membrane electrode 20, and here, unlike the function of the existing liquid electrolyte gas sensor, the moisture retention film 30 transfers protons to conduct the sensor circuit, but maintains the humidity inside the gas sensor 1, thereby better solving the problem that the existing solid electrolyte gas sensor is greatly affected by the humidity. As shown in fig. 3, when the humidity inside the sensor changes, the detection result of the conventional sensor changes abruptly, and the detection result is extremely inaccurate, that is, the humidity has a great influence on the conventional solid electrolyte sensor. When the humidity inside the sensor changes, the detection result of the gas sensor 1 according to the embodiment of the present invention changes less, that is, the humidity has less influence on the gas sensor 1 according to the embodiment of the present invention. Meanwhile, the first gas diffusion layer 410 can also better separate the moisture retention membrane 30 from the membrane electrode 20, thereby preventing the moisture retention solution on the moisture retention membrane 30 from hindering the normal reaction of the membrane electrode 20. Thus, the presence of the first gas diffusion layer 410 better ensures the proper reaction of the gas sensor 1.
According to the gas sensor 1 of the embodiment of the invention, the membrane electrode 20 is the solid electrolyte membrane electrode 20, and the moisture retention membrane 30 is arranged on the side, far away from the air inlet 111, of the membrane electrode 20, so that the liquid leakage phenomenon which often occurs in the existing gas sensor of liquid electrolyte or semisolid electrolyte is avoided, the potential safety hazard of the gas sensor 1 of the embodiment of the invention is reduced, the service life of the gas sensor is prolonged, meanwhile, the influence of the environmental humidity on the detection result of the gas sensor 1 is also reduced, and the detection precision of the gas sensor 1 is ensured.
In some embodiments, as shown in fig. 2, a second gas diffusion layer 420 is disposed between the membrane electrode 20 and the gas inlet 111. It is understood that the first gas diffusion layer 410 and the second gas diffusion layer 420 can support the membrane electrode 20, so that the thin and soft membrane electrode 20 is not easy to deform, and the phenomenon that the free liquid in the wet membrane 30 is accumulated on the surface of the membrane electrode 20 to block the reaction from proceeding can be avoided.
In some embodiments, the first gas diffusion layer 410 and the second gas diffusion layer 420 are porous hydrophobic conductive layers that can be used to collect electrons for the membrane electrode reactions. Thus, the first gas diffusion layer 410 prevents the liquid released from the moisture retention membrane 30 from accumulating on the surface of the membrane electrode 20, thereby preventing the reaction from proceeding. Advantageously, the first gas diffusion layer 410 and the second gas diffusion layer 420 are carbon paper or carbon cloth. In addition, since the first gas diffusion layer 410 and the second gas diffusion layer 420 may be conductive members, the first gas diffusion layer 410 and the second gas diffusion layer 420 are electrically connected to the membrane electrode 20 and the control circuit board, respectively. Therefore, the first gas diffusion layer 410 and the second gas diffusion layer 420 can also collect electrons generated by membrane electrode reaction, thereby further ensuring that the electrons generated by membrane electrode 20 reaction can be transmitted to the control circuit board, and ensuring the detection accuracy of the gas sensor 1.
In some embodiments, as shown in fig. 2, the casing 10 includes a cover shell 110 and a bottom shell 120, one side of the cover shell 110 is provided with an air inlet 111, the other side of the cover shell 110 is formed with a mounting groove 1121 communicated with the air inlet 111, the membrane electrode 20, the moisture retention membrane 30 and the first and second gas diffusion layers 410 and 420 are all disposed in the mounting groove 1121, and the bottom shell 120 is snapped on the cover shell 110 to close the mounting groove 1121. Therefore, the membrane electrode 20, the moisture retention membrane 30, the first gas diffusion layer 410 and the second gas diffusion layer 420 can be ensured to be in a certain relatively closed space, and when the gas to be detected enters the mounting groove 1121 through the gas inlet 111, the gas to be detected can fully react with the membrane electrode 20, so that the detection accuracy of the gas sensor 1 is improved.
In some embodiments, as shown in fig. 2, a protrusion 112 is formed on a side of the cover shell 110 facing the bottom shell 120, a groove for matching with the protrusion 112 is formed on the bottom shell 120, and the mounting groove 1121 is formed on the protrusion 112. Thereby, the relative sealing property of the mounting groove 1121 can be further improved, thereby better ensuring the accuracy of the gas sensor 1.
In some more specific embodiments, as shown in fig. 2, a bottom groove 1122 is formed on the bottom wall of the mounting groove 1121, and a plurality of supporting protrusions 1123 are formed in the bottom groove 1122 so as to surround the air inlet 111. It is understood that if the membrane electrode 20 is stopped directly against the bottom wall of the mounting groove 1121, the contact area of the membrane electrode 20 with the gas is reduced to some extent, thereby adversely affecting the detection accuracy and the detection speed of the gas sensor 1. In the embodiment of the present invention, the bottom wall of the mounting groove 1121 is provided with a bottom groove 1122, and the bottom groove 1122 is further provided with a supporting protrusion 1123, so that a certain gap is formed between the membrane electrode 20 and the bottom wall of the mounting groove 1121, and the contact area between the membrane electrode 20 and the gas is increased, thereby ensuring the detection accuracy and the detection speed of the gas sensor 1. Preferably, the number of the support protrusions 1123 is 2-4
Of course, the membrane electrode 20, the first gas diffusion layer 410, the second gas diffusion layer, and the moisture retention membrane 30 may be mounted in other ways, and are not limited to the above.
In some alternative embodiments, as shown in fig. 2, the gas sensor 1 further includes a conductive pin 60, and the conductive pin 60 is electrically connected to the control circuit board 50, the first gas diffusion layer 410 and the second gas diffusion layer, respectively, so as to transmit electrons of the membrane electrode 20 reaction collected by the first gas diffusion layer 410 and the second gas diffusion layer 420 to the control circuit board 50. It can be understood that the conductive pins 60 are used as a connecting medium for the first gas diffusion layer 410, the second gas diffusion layer 420 and the control circuit board 50, so that the structure of the gas sensor 1 is simplified, and the structural stability of the gas sensor 1 is enhanced.
In some embodiments, as shown in fig. 2, the conductive pin 60 includes a plug portion 610, a soldering portion 630 and a connecting portion 620, which are respectively formed as a cylinder, the plug portion 610 and the soldering portion 630 are respectively connected to two ends of the connecting portion 620, the plug portion 610 is plugged onto the cover case 110, and the soldering portion 630 is soldered on the control circuit board 50 through the bottom case 120. It can be understood that the conductive pins 60 are plugged on the cover case 110 through the plugging portions 610, and the soldering portions 630 are soldered on the control circuit board 50 through the bottom case 120, so that the strength of the gas sensor 1 is increased to some extent while the electrical connection between the first gas diffusion layer 410, the second gas diffusion layer 420 and the control circuit board 50 is ensured, the possibility of cracking or damage of the gas sensor 1 caused by external force is reduced, and the service life of the gas sensor 1 is further prolonged.
In some more specific embodiments, as shown in fig. 2, the diameter of the welding portion 630 is smaller than the diameter of the insertion portion 610, and the diameter of the insertion portion 610 is smaller than the diameter of the connection portion 620. It is understood that the relatively small diameter of the soldering portion 630 facilitates soldering of the conductive pins 60 to the control circuit board 50, and the large diameter of the socket portion 610 facilitates improving the connection stability between the socket portion 610 and the cover shell 110. The diameter of the connecting portion 620 is larger than the diameters of the welding portion 630 and the inserting portion 610, so that on one hand, axial positioning is provided for the welding portion 630, welding is convenient, and on the other hand, the strength of the whole conductive contact pin 60 is guaranteed. Of course, in other embodiments of the present invention, the diameters of the welding portion 630, the insertion portion 610 and the connection portion 620 may be selected according to practical situations, and are not limited to the above embodiments.
Of course, in other embodiments of the present invention, the electrical connection between the first gas diffusion layer 410, the second gas diffusion layer 420 and the control circuit board 50 may be implemented in other manners, and the bottom case 120 and the cover case 110 may also be directly connected by using screws, which is not limited to the connection manners described above.
In some embodiments, the moisture retention film 30 is a porous plastic film, and at least one of sulfuric acid, phosphoric acid and a perfluorosulfonic acid polymer solution is stored in the moisture retention film 30 as a moisture retention solution, so that the moisture retention film 30 can provide a certain humidity environment for the membrane electrode 20, reduce the influence of humidity changes on the membrane electrode 20, and improve the detection accuracy of the gas sensor 1.
Advantageously, the moisture-retaining membrane 30 is a porous polyvinyl chloride membrane, and the moisture-retaining membrane 30 is prepared by hot-pressing a polyvinyl chloride spherical raw material at the temperature of 150 ℃ and 190 ℃ and under the pressure of 0-50 kg/cm.
In some embodiments, gas sensor 1 further comprises a water-resistant gas-permeable membrane 80 fitted at gas inlet 111. Therefore, the external water drops can be prevented from entering the gas sensor 1, and the detection result of the gas sensor 1 is prevented from being interfered. The material and waterproof property of the waterproof breathable film 80 are not specifically limited, and can be selected according to the use environment of the gas sensor 1.
Example (b):
a gas sensor 1 according to one embodiment of the present invention is described below with reference to fig. 1 to 2.
As shown in fig. 1 and fig. 2, the gas sensor 1 of the present embodiment includes a housing 10, a membrane electrode 20, a moisture retention membrane 30, a first gas diffusion layer 410, a second gas diffusion layer 420, a control circuit board 50, and a conductive pin 60, wherein the housing 10 is provided with an air inlet 111, the membrane electrode 20 is disposed in the housing 10, two opposite side surfaces of the membrane electrode 20 form two electrodes, one side surface of the membrane electrode 20 is disposed toward the air inlet 111, the membrane electrode 20 is a solid electrolyte membrane electrode 20, the moisture retention membrane 30 is disposed on the other side surface of the membrane electrode 20, the first gas diffusion layer 410 is disposed between the moisture retention membrane 30 and the membrane electrode 20, and the second gas diffusion layer 420 is disposed between the air inlet 111 and the.
The casing 10 includes a cover 110 and a bottom case 120, wherein an air inlet 111 is formed at one side of the cover 110, an installation groove 1121 communicated with the air inlet 111 is formed at the other side of the cover 110, the membrane electrode 20, the first gas diffusion layer 410 of the moisture retention membrane 30 and the gas diffusion layer 420 are all arranged in the installation groove 1121, and the bottom case 120 is fastened on the cover 110 to close the installation groove 1121. A protrusion 112 is formed on a side of the cover case 110 facing the bottom case 120, a groove matched with the protrusion 112 is formed on the bottom case 120, and a mounting groove 1121 is formed on the protrusion 112. A bottom groove 1122 is formed in the bottom wall of the mounting groove 1121, and a plurality of support protrusions 1123 surrounding the air inlet 111 are formed in the bottom groove 1122.
The conductive pin 60 includes a socket part 610, a soldering part 630 and a connecting part 620 which are respectively formed as cylinders, the socket part 610 and the soldering part 630 are respectively connected to two ends of the connecting part 620, the socket part 610 is plugged on the cover case 110 and connected to the first gas diffusion layer 410 and the second gas diffusion layer 420 through the metal wires 70, and the soldering part 630 is soldered on the control circuit board 50 through the bottom case 120. The first gas diffusion layer 410 and the second gas diffusion layer 420 can collect electrons generated by the reaction of the two electrodes of the membrane electrode 20, the electrons are transmitted to the conductive pin 60 through the metal wire 70, and the conductive pin 60 leads out a signal to the control circuit board 50.
The gas sensor 1 of the present embodiment has the following advantages:
1. compared with other electrochemical formaldehyde sensors, the sensor has the following advantages:
2. the method of combining the solid electrolyte membrane electrode 20 and the moisture retention membrane 30 effectively reduces the influence of humidity change on the baseline and the response strength of the gas sensor 1, and prolongs the service life of the gas sensor 1.
3. The method of adding diffusion layers on the two sides of the membrane electrode 20 is adopted, so that the test stability of the gas sensor 1 is enhanced.
4. The conductive pins 60 are used as the connecting medium between the membrane electrode 20 and the control circuit board 50, so that the module of the gas sensor 1 is simple and easy to prepare.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (11)
1. A gas sensor, comprising:
the air inlet is arranged on the shell;
the membrane electrode is arranged in the shell, two opposite side surfaces of the membrane electrode form two electrodes, one side surface of the membrane electrode faces the air inlet, and the membrane electrode is a solid electrolyte membrane electrode;
the moisture retention film is arranged on the other side of the membrane electrode;
a first gas diffusion layer provided between the moisture-retaining membrane and the membrane electrode;
the control circuit board is arranged outside the shell and connected with the shell, and the control circuit board is electrically connected with the membrane electrode.
2. The gas sensor according to claim 1, wherein a second gas diffusion layer is provided between the membrane electrode and the gas inlet.
3. The gas sensor of claim 2, wherein the first gas diffusion layer and the second gas diffusion layer are porous hydrophobic conductive layers, the first gas diffusion layer and the second gas diffusion layer can be used for collecting electrons of the membrane electrode reaction, and the first gas diffusion layer and the second gas diffusion layer are both electrically connected with the membrane electrode and the control circuit board.
4. The gas sensor of claim 3, wherein the housing comprises:
the cover shell is provided with the air inlet at one side, an installation groove communicated with the air inlet is formed at the other side of the cover shell, and the membrane electrode, the moisture retention membrane, the first gas diffusion layer and the second gas diffusion layer are all arranged in the installation groove;
and the bottom shell is buckled on the cover shell to seal the mounting groove.
5. The gas sensor according to claim 4, wherein a protrusion is provided on a side of the cover case facing the bottom case, a groove for fitting the protrusion is provided on the bottom case, and the mounting groove is formed on the protrusion.
6. The gas sensor according to claim 4, wherein a bottom groove is formed on a bottom wall of the mounting groove, and a plurality of supporting protrusions are arranged in the bottom groove and surround the gas inlet.
7. The gas sensor of claim 4, further comprising: and the conductive pins are respectively and electrically connected with the control circuit board, the first gas diffusion layer and the second gas diffusion layer so as to transmit the electrons of the membrane electrode reaction collected by the first gas diffusion layer and the second gas diffusion layer to the control circuit board.
8. The gas sensor according to claim 7, wherein the conductive pin includes a socket portion, a soldering portion and a connecting portion, which are respectively formed as a cylinder, the socket portion and the soldering portion are respectively connected to both ends of the connecting portion, the socket portion is plugged to the cover case, and the soldering portion is soldered to the control circuit board through the bottom case.
9. The gas sensor according to claim 8, wherein the diameter of the welding portion is smaller than the diameter of the insertion portion, and the diameter of the insertion portion is smaller than the diameter of the connection portion.
10. The gas sensor according to any one of claims 1 to 8, wherein the moisture retention membrane is a porous plastic film, and at least one of sulfuric acid, phosphoric acid, and a perfluorosulfonic acid type polymer solution is stored as a moisture retention solution in the moisture retention membrane.
11. The gas sensor according to any one of claims 1 to 8, further comprising a waterproof, gas-permeable membrane fitted at the gas inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811627575.0A CN111380931A (en) | 2018-12-28 | 2018-12-28 | Gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811627575.0A CN111380931A (en) | 2018-12-28 | 2018-12-28 | Gas sensor |
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| CN111380931A true CN111380931A (en) | 2020-07-07 |
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| CN201811627575.0A Pending CN111380931A (en) | 2018-12-28 | 2018-12-28 | Gas sensor |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| US20070218347A1 (en) * | 2006-03-14 | 2007-09-20 | Honda Motor Co., Ltd. | Membrane electrode assembly for use in solid polymer electrolyte fuel cell |
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| US20070218347A1 (en) * | 2006-03-14 | 2007-09-20 | Honda Motor Co., Ltd. | Membrane electrode assembly for use in solid polymer electrolyte fuel cell |
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