CN217133028U - Electrochemical gas sensor - Google Patents
Electrochemical gas sensor Download PDFInfo
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- CN217133028U CN217133028U CN202220232862.7U CN202220232862U CN217133028U CN 217133028 U CN217133028 U CN 217133028U CN 202220232862 U CN202220232862 U CN 202220232862U CN 217133028 U CN217133028 U CN 217133028U
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- electrochemical gas
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 57
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 29
- 239000003792 electrolyte Substances 0.000 claims abstract description 8
- 239000010410 layer Substances 0.000 claims description 40
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 10
- 239000012528 membrane Substances 0.000 claims description 9
- 230000008054 signal transmission Effects 0.000 claims description 5
- 239000012790 adhesive layer Substances 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 16
- 239000007787 solid Substances 0.000 abstract description 8
- 230000003197 catalytic effect Effects 0.000 abstract description 5
- 230000010354 integration Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 61
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 36
- 239000001301 oxygen Substances 0.000 description 36
- 229910052760 oxygen Inorganic materials 0.000 description 36
- 238000001514 detection method Methods 0.000 description 6
- 239000007769 metal material Substances 0.000 description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000005518 electrochemistry Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000000231 atomic layer deposition Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007084 catalytic combustion reaction Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
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Abstract
The utility model discloses an electrochemical gas sensor, which comprises a shell, wherein the top of the shell is provided with a through hole for allowing the introduction of external gas; a reaction cavity is arranged in the shell, an inlet assembly is arranged at the top of the reaction cavity, and the inlet assembly is arranged in the air inlet direction of the through hole and used for allowing the gas to be detected to pass through; the reaction chamber is internally provided with electrolyte and an electrode assembly contacted with the electrolyte, a circuit board is arranged below the reaction chamber, and the circuit board is connected with the electrode assembly and used for converting electrical signals. The utility model has the advantages that the volume of the sensor is small and the integration level is high by arranging the circuit board inside; the noble metal layer is arranged on the solid diaphragm, so that the gas to be detected can selectively pass through the noble metal layer, and the noble metal layer can also be used as a cathode and an active catalytic material for the reaction of the gas to be detected, and the reaction rate of the gas to be detected is improved; and through setting up compensation resistor in inside, solved the sensor and receive the temperature change and make the big problem of electric signal error of output.
Description
Technical Field
The utility model relates to a gas sensor's technical field, more specifically relates to an electrochemistry gas sensor.
Background
The existing gas sensors are classified into different types according to the type of gas to be detected and different application scenarios. Among them, the main types are semiconductor gas sensors, catalytic combustion gas sensors, electrochemical gas sensors, optical gas sensors, ultrasonic gas sensors, and photo-ion detection gas sensors.
The electrochemical gas sensor occupies the largest share of the market, and the electrochemical gas sensor is the most widely applied gas sensor. The electrochemical gas sensor is divided into four types, namely a galvanic cell type, a controllable potential electrolysis type, an electric quantity type and an ion electrode type, and the gas concentration is detected mainly by detecting the current under different states. The method is mainly used for detecting toxic gas, oxygen and alcohol burner gas, and is mainly applied to industries such as petrochemical industry, metallurgy, mine and the like.
Because the electrochemical gas sensor is widely applied, how to improve the performance of the electrochemical gas sensor and reduce the production cost has very important effect on improving the market share of the gas sensor.
In addition, the traditional electrochemical gas sensor is externally connected with applied equipment through two pins protruding from the surface of the traditional electrochemical gas sensor, so that the connection is inconvenient, the integration level of the sensor is not high, the size of the sensor is not small enough, and the market share is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at overcoming above-mentioned prior art at least one kind defect (not enough), provide an electrochemistry gas sensor for solve electrochemistry gas sensor's the low, awkward problem of integrated level.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is:
an electrochemical gas sensor comprises a shell, wherein the top of the shell is provided with a through hole for allowing external gas to enter; a reaction cavity is arranged in the shell, an inlet assembly is arranged at the top of the reaction cavity, and the inlet assembly is arranged in the air inlet direction of the through hole and used for allowing the gas to be detected to pass through; the reaction chamber is internally provided with electrolyte and an electrode assembly contacted with the electrolyte, a circuit board is arranged below the reaction chamber, and the circuit board is connected with the electrode assembly and used for converting electrical signals.
In the technical scheme, the circuit board is arranged in the shell of the sensor and connected with the electrode assembly, so that the problem of conversion of electrical signals when chemical reaction occurs in the sensor is solved, the integration level is higher, the size is smaller, and the requirements of users are met. Specifically, the reaction chamber is used for providing a place for the gas to be detected to react, so as to detect the concentration of the gas to be detected. Preferably, the gas to be measured is oxygen.
In one embodiment, the shell comprises a top cover, a first shell and a second shell which are connected in sequence, and the through hole is formed in the top cover; the first shell is used for installing a reaction cavity; the second shell is used for installing a circuit board and is connected with the first shell in a sealing mode.
In one embodiment, the second housing is further provided with a socket for connecting an external device, and the socket is arranged below the circuit board and connected with the circuit board.
Specifically, the interface is used for being connected with external equipment and meters so as to form signal transmission.
In one embodiment, the top cover is provided with a mounting part for being connected with external detection equipment in a sealing mode.
Specifically, outside check out test set passes through this installation department and top cap sealing connection, and then connects the reaction chamber to gas in the outside check out test set detects. For example, this outside check out test set can be the oxygen pipeline of outside, and the export of oxygen pipeline passes through this installation department and top cap sealing connection, and then makes oxygen get into the reaction intracavity, also avoids external gas to get into the reaction intracavity simultaneously to can detect the oxygen concentration in the oxygen pipeline.
Further, the auxiliary connection structure may be a screw structure, a sealing ring, or the like.
In one embodiment, the electrode assembly includes at least two electrodes, i.e., a cathode and an anode, which are vertically disposed in the reaction chamber, and an insulating layer is disposed between the cathode and the anode.
Further, the cathode is a PTFE membrane.
In another embodiment, the inlet assembly includes a solid-state membrane for allowing the gas to be measured to pass through, the solid-state membrane having a noble metal layer disposed thereon, the noble metal layer being a cathode; the electrode assembly includes at least an anode with an insulating layer disposed therebetween.
The technical scheme utilizes the metal characteristic of the noble metal layer as the cathode of the gas to be detected for carrying out chemical reaction, and the design of the cathode is not needed to be additionally added, so that the structure is simpler, the cost is lower, and the requirements of users are met. Furthermore, the noble metal layer can also be used as an active catalyst, so that the effective diffusion of the gas to be detected is controlled, the reaction rate with the gas to be detected is accelerated, and the long-term stability and the low drift level of the sensor are ensured.
Preferably, the noble metal layer comprises at least two noble metal materials with different densities, and the noble metal layer is covered on the solid diaphragm through an atomic layer deposition process. The process of atomic layer deposition enables the noble metal layer to be more uniform on the solid diaphragm. The noble metal layer and the solid diaphragm act together to serve as a cathode and a catalytic material layer for the reaction of the gas to be detected. Through the noble metal material layers with different densities, the porous structure of the catalytic material layer can be increased, and the oxygen passing rate can be improved. In addition, different noble metal material layers can complement the defects of each other, so that the catalytic action of the noble metal layer is better.
Further, the solid-state membrane is a fluorine-containing membrane, preferably a polytetrafluoroethylene membrane, namely a PTFE membrane; the gas to be detected is oxygen, and the insulating layer is a fluorine-containing diaphragm.
In one embodiment, at least two groups of metal pins are arranged below the reaction chamber, one end of each metal pin is respectively connected with the cathode and the anode, and the other end of each metal pin is connected with a circuit board for signal transmission.
Specifically, the number of the metal pins corresponds to the number of electrodes of the electrode assembly.
In one embodiment, at least two sets of conductive wires are arranged in the reaction cavity, one ends of the conductive wires are respectively connected with the cathode and the anode, and the other ends of the conductive wires are respectively connected with corresponding metal pins so as to be connected with a circuit board through the metal pins.
Specifically, the number of conductive wires, electrode assemblies, and metal pins corresponds one-to-one. Wherein, can set up fixed resistance on the circuit board, the metal contact pin is connected with fixed resistance, and through the potential difference that fixed resistance produced, the concentration of measuring oxygen.
In one embodiment, a waterproof breathable layer is arranged on the inlet assembly, the waterproof breathable layer is tightly attached to the bottom of the through hole, and an adhesive layer is arranged between the waterproof breathable layer and the inlet assembly.
Waterproof ventilative layer can the separation external steam, prevents that external steam, pollutant etc. from falling into on the entry subassembly and influencing the measuring result.
Furthermore, the electrochemical gas sensor in the technical scheme is a solid diaphragm type oxygen sensor. The oxygen sensor is mainly classified into a capillary type oxygen sensor and a solid diaphragm type oxygen sensor.
Among them, the capillary type oxygen sensor mainly measures the concentration of oxygen. However, the capillary oxygen sensor has a certain requirement on the range of the oxygen concentration to be measured, and when the oxygen concentration is 0-30%, the oxygen concentration and the cell signal output are in a linear relationship, but when the oxygen concentration is higher than 30%, deviation occurs, which brings difficulty to measurement.
Whereas solid-state diaphragm gas sensors measure primarily the partial pressure of oxygen. The diffusion of oxygen into the working electrode is determined by the partial pressure of oxygen. Namely, the output signal of the sensor is in linear relation with the partial pressure of oxygen in the mixed gas, so that the solid diaphragm type oxygen sensor is not limited to the oxygen concentration, can measure the oxygen in the range of 0-100 percent, and has wider application range.
Further, still include compensation resistance, compensation resistance sets up in the lateral wall of reaction chamber, and is connected with the circuit board.
The electrochemical gas sensor is sensitive to temperature change, and the stability of the detection temperature of the electrochemical gas sensor can be ensured through the built-in compensation resistor, so that the electrochemical gas sensor has a very important effect on improving the detection accuracy.
Specifically, the resistance value of the compensation resistor changes along with the change of the temperature of the reaction chamber, and the electric signal error value of the sensor can be compensated through the change of the resistance value of the compensation resistor, so that the concentration value of the gas to be detected can be calculated according to the actual voltage value of the gas to be detected. Wherein, the temperature change of reaction chamber can embody the temperature change of external environment, and then can compensate the influence of external temperature change to the voltage signal that the gas that awaits measuring brought.
Furthermore, the compensation resistor is of a direct-insert structure, is inserted into one side wall of the reaction cavity, and is independent of the reaction cavity. The compensation resistor is inserted into the reaction cavity, so that the problem of stable placement of the compensation resistor is solved, and the compensation resistor can sense the temperature change of the reaction cavity more sensitively. The conventional compensation resistor is generally arranged below the circuit board, and is relatively far away and influenced by the circuit board, so that the sensitivity is relatively poor, and the embodied temperature change has a relatively large error with the temperature change of the external environment. Specifically, a groove which is open along the bottom can be formed in the reaction cavity, the groove is connected with the side wall of the reaction cavity in a sealing mode, and the compensation resistor is arranged in the groove and used for receiving feedback of temperature change of the reaction cavity in a close distance, so that the resistance value corresponding to the temperature change is determined more sensitively and more accurately, and temperature compensation is performed.
Further, the compensation resistor is a thermistor. The resistance value of the thermistor changes with a change in temperature, and thus an error is compensated for by the change in the resistance value of the thermistor. Specifically, the compensation resistor is a negative temperature coefficient compensation resistor.
Compared with the prior art, the beneficial effects of the utility model are that:
the electrochemical gas sensor of the utility model has the advantages that the circuit board is arranged in the electrochemical gas sensor, so that the sensor has small volume and high integration level and is more convenient to use; the noble metal layer is arranged on the solid diaphragm, so that the gas to be detected can selectively pass through the noble metal layer, the noble metal layer can be used as a cathode for the reaction of the gas to be detected, the noble metal layer can also be used as an active catalytic material, no cathode is required to be additionally arranged, and the reaction rate of the gas to be detected is improved; and through setting up compensation resistor in inside, solved the sensor and receive the temperature change and make the big problem of electric signal error of output.
Drawings
Fig. 1 is a sectional structure view of the present invention.
Fig. 2 is a schematic diagram of the internal structure of the present invention.
Detailed Description
The drawings of the present invention are for illustration purposes only and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
As shown in fig. 1 and 2, the present embodiment discloses an electrochemical gas sensor, and in particular, the electrochemical gas sensor is a solid-state diaphragm gas sensor, which can be used for detecting the concentration of oxygen.
The electrochemical gas sensor comprises a housing, which comprises a top cover 100, a first shell 200 and a second shell 300 which are hermetically connected from top to bottom in sequence, wherein the top cover 100 is provided with a through hole 110 for allowing gas to pass through. A reaction chamber 400 is arranged in the first housing 200, an inlet assembly 410 is arranged at the top of the reaction chamber 400, and the inlet assembly 410 is used for allowing oxygen to enter; specifically, the inlet assembly 410 is disposed in an air intake direction of the through-hole. The reaction chamber 400 is also provided therein with an electrolyte and an electrode assembly in contact with the electrolyte. Specifically, the reaction chamber 400 is disposed in the first housing 200, the inlet assembly 410 includes a solid-state diaphragm, preferably a PTFE film, the solid-state diaphragm is configured to allow the gas to be detected to pass through, a noble metal layer is disposed on the solid-state diaphragm, the gas to be detected reaches the noble metal layer after passing through the solid-state diaphragm, the noble metal layer and the solid-state diaphragm cooperate to serve as a cathode for reacting with the gas to be detected, and the noble metal layer can also serve as an active catalyst to accelerate the reaction rate of the gas to be detected. More preferably, the noble metal layer at least comprises two noble metal materials with different densities, the two noble metal materials with different densities can complement defects, and the porous structure of the noble metal layer is increased, so that the reaction of the gas to be detected is facilitated. Wherein the electrode assembly includes an anode 420, wherein an insulating layer 430 is disposed between the inlet assembly 410 and the anode 420.
Further, two sets of exposed metal pins 500 are disposed at the bottom of the first housing 200, two sets of conductive wires are disposed in the reaction chamber 400, and the cathode and the anode 420 are respectively connected to the corresponding metal pins 500 through two sets of conductive wires 450.
Further, the inlet assembly 410 is further provided with a waterproof breathable layer 440, and the waterproof breathable layer 440 is tightly attached to the bottom of the through hole.
Further, a compensation resistor (not shown) is disposed on a sidewall of the reaction chamber 400, and specifically, a groove 600 opened along a bottom is formed on the sidewall of the reaction chamber 400, the groove 600 is independent from the reaction chamber 400, and the groove 600 is used for installing the compensation resistor. The compensation resistor is a thermistor, the resistance value of which changes with the temperature of the reaction chamber, and is used for compensating the electric signal error generated by the change of the ambient temperature when the oxygen enters the reaction chamber 400. Further, the thermistor is a negative temperature coefficient thermistor.
Further, a circuit board 700 is disposed at the bottom of the compensation resistor, and the circuit board 700 is connected to the metal pins 500 at the bottom of the reaction chamber 400, thereby connecting the electrode assembly. Specifically, a fixed resistor may be disposed on the circuit board 700, and the fixed resistor is connected to the metal contact pin 500 to connect the electrode assembly, and the current generated by the oxygen during the redox reaction of the electrode assembly may be calculated by the fixed resistor, so as to measure the concentration of the oxygen.
Specifically, the circuit board 700 is disposed in the second housing 300, the second housing 300 is hermetically connected to the first housing 200, and the second housing 300 is further provided with a socket 800 for connecting with external devices and meters for signal transmission, and the external devices and meters and the like perform signal transmission with the circuit board 700 through the socket 800.
Further, the outer wall of the top cover 100 is further provided with a mounting portion for sealing connection with an external detection device, specifically, the mounting portion may be a sealing thread structure through which an external detection device is connected, such as an external oxygen pipeline or the like, to detect the oxygen concentration in the oxygen pipeline.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not limitations to the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (10)
1. An electrochemical gas sensor is characterized by comprising a shell, wherein the top of the shell is provided with a through hole for allowing external gas to enter; a reaction cavity is arranged in the shell, an inlet assembly is arranged at the top of the reaction cavity, and the inlet assembly is arranged in the air inlet direction of the through hole and used for allowing the gas to be detected to pass through; the reaction chamber is internally provided with electrolyte and an electrode assembly contacted with the electrolyte, a circuit board is arranged below the reaction chamber, and the circuit board is connected with the electrode assembly and used for converting electrical signals.
2. The electrochemical gas sensor according to claim 1, wherein the housing comprises a top cover, a first housing and a second housing connected in sequence, the through hole being provided on the top cover; the first shell is used for installing a reaction cavity; the second shell is used for installing a circuit board and is connected with the first shell in a sealing mode.
3. The electrochemical gas sensor according to claim 2, wherein a socket is further provided in the second housing for connecting an external device, the socket being provided under the circuit board and connected to the circuit board.
4. An electrochemical gas sensor according to claim 2, wherein the top cover is provided with a mounting portion for sealing connection with an external sensing device.
5. An electrochemical gas sensor according to claim 1, wherein the electrode assembly comprises at least two electrodes, a cathode and an anode, respectively, the cathode and the anode being disposed one above the other within the reaction chamber with an insulating layer disposed therebetween.
6. The electrochemical gas sensor according to claim 1, wherein the inlet assembly comprises a solid-state membrane for allowing the gas to be measured to pass therethrough, the solid-state membrane having a noble metal layer disposed thereon, the noble metal layer being a cathode; the electrode assembly includes at least an anode with an insulating layer disposed therebetween.
7. An electrochemical gas sensor according to claim 5 or 6, wherein at least two groups of metal pins are arranged below the reaction chamber, one end of each metal pin is connected with the cathode and the anode respectively, and the other end of each metal pin is connected with a circuit board for signal transmission.
8. The electrochemical gas sensor according to claim 7, wherein at least two sets of conductive wires are disposed in the reaction chamber, one ends of the conductive wires are respectively connected to the cathode and the anode, and the other ends of the conductive wires are respectively connected to corresponding metal pins, so as to be connected to a circuit board through the metal pins.
9. The electrochemical gas sensor according to claim 1, wherein the inlet assembly is provided with a waterproof gas permeable layer, the waterproof gas permeable layer is tightly attached to the bottom of the through hole, and an adhesive layer is provided between the waterproof gas permeable layer and the inlet assembly.
10. The electrochemical gas sensor according to claim 1, further comprising a compensation resistor disposed on an outer sidewall of the reaction chamber and connected to the circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220232862.7U CN217133028U (en) | 2022-01-27 | 2022-01-27 | Electrochemical gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220232862.7U CN217133028U (en) | 2022-01-27 | 2022-01-27 | Electrochemical gas sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217133028U true CN217133028U (en) | 2022-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220232862.7U Active CN217133028U (en) | 2022-01-27 | 2022-01-27 | Electrochemical gas sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217133028U (en) |
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- 2022-01-27 CN CN202220232862.7U patent/CN217133028U/en active Active
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