CN220772983U - Device for improving measurement stability of oxygen sensor - Google Patents
Device for improving measurement stability of oxygen sensor Download PDFInfo
- Publication number
- CN220772983U CN220772983U CN202322402647.4U CN202322402647U CN220772983U CN 220772983 U CN220772983 U CN 220772983U CN 202322402647 U CN202322402647 U CN 202322402647U CN 220772983 U CN220772983 U CN 220772983U
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- Prior art keywords
- oxygen sensor
- sample gas
- sensor
- temperature
- pipeline
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 239000001301 oxygen Substances 0.000 title claims abstract description 60
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 60
- 238000005259 measurement Methods 0.000 title claims abstract description 31
- 239000007789 gas Substances 0.000 claims abstract description 82
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229920000742 Cotton Polymers 0.000 claims abstract description 9
- 238000004321 preservation Methods 0.000 claims abstract description 7
- 230000033228 biological regulation Effects 0.000 claims abstract description 6
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 239000004033 plastic Substances 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 230000000903 blocking effect Effects 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 7
- 239000003792 electrolyte Substances 0.000 claims description 5
- 230000002209 hydrophobic effect Effects 0.000 claims description 4
- 230000001052 transient effect Effects 0.000 abstract description 5
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 239000000523 sample Substances 0.000 abstract 6
- 230000005540 biological transmission Effects 0.000 abstract 2
- 239000003570 air Substances 0.000 description 17
- 238000000034 method Methods 0.000 description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 230000036632 reaction speed Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- -1 hydroxyl ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
The utility model discloses a device for improving the measurement stability of an oxygen sensor, in particular to the field of oxygen concentration measurement, which comprises a sample gas pipeline transmission gas circuit, wherein the sample gas pipeline transmission gas circuit comprises a sample gas input pipeline, a pressure and flow control module and a temperature control module, the pressure and flow control module comprises needle valve knob control, a speed regulation flowmeter and a gas resistance device, and the temperature control module comprises a temperature sensor and a temperature controller; the sample gas measuring part comprises an electrochemical oxygen sensor, a heating ring and heat preservation cotton, wherein the electrochemical oxygen sensor and the temperature sensor are arranged on a sensor base, and the platinum resistance temperature measuring probe part extends into the vicinity of the oxygen sensor; and the tail gas discharge part comprises a tail gas discharge pipeline which is communicated with the outlet. The utility model eliminates the interference of the ambient temperature to the oxygen concentration measurement; the abnormal fluctuation of measurement caused by the pressure transient of the sample is greatly reduced.
Description
Technical Field
The utility model relates to the technical field of oxygen concentration measurement, in particular to a device for improving the measurement stability of an oxygen sensor.
Background
Oxygen concentration detecting instruments have been widely used in hospitals, medical equipment, pharmaceutical industry, petroleum, petrochemical industry, power plants, and the like.
The method for measuring the oxygen content in the on-line monitoring field is mainly an electrochemical method and a zirconia method, the application of an ultrasonic method in the environment monitoring field is relatively less, the measurement accuracy is low when the oxygen concentration is measured by the ultrasonic method, the measurement accuracy and stability of the oxygen concentration measured by the zirconia method are greatly influenced by the flow of detected gas, the attenuation is fast when the electrochemical sensor is used, the drift amount is large, the measurement is greatly influenced by the environmental temperature, the environmental temperature of the sensor is not controlled at present, and the measurement data of the electrochemical oxygen sensor is distorted due to the fact that the temperature of the oxygen electrochemical sensor is different at different times and places when the oxygen electrochemical sensor is used for usual measurement.
Therefore, we improve this and propose a device for improving the measurement stability of the oxygen sensor.
Disclosure of Invention
In order to solve the technical problems, the utility model provides the following technical scheme:
the utility model relates to a device for improving the measurement stability of an oxygen sensor, which comprises a sample gas conveying part, wherein the sample gas conveying part comprises a sample gas input pipeline, a pressure and flow control module and a temperature control module, the pressure and flow control module comprises needle valve knob control, a speed regulation flowmeter and an air resistance device, and the temperature control module comprises a temperature sensor;
the sample gas measuring part is arranged in the plastic spraying sheet metal shell and comprises an electrochemical oxygen sensor, a heating ring and heat insulation cotton, the temperature sensor is also arranged in the plastic spraying sheet metal shell, the electrochemical oxygen sensor and the temperature sensor are both arranged on a sensor base, one end of the sensor base is provided with an inlet, and the other end of the sensor base is provided with an outlet;
and the tail gas exhaust part comprises a tail gas exhaust pipeline which is communicated with the outlet.
As a preferable technical scheme of the utility model, an external vacuum pump is arranged at the input port of the sample gas input pipeline in a communicated manner, and a needle valve controlled by a needle valve knob is communicated with the sample gas input pipeline.
As a preferable technical scheme of the utility model, the electrochemical oxygen sensor is composed of a cathode, an anode and a filled electrolyte, and a fixed-resistance resistor is arranged between the cathode and the anode.
As a preferable technical scheme of the utility model, a three-way pipeline is communicated between the sample gas input pipeline and the needle valve, one gas path of the three-way pipeline is communicated with the needle valve, and the other gas path of the three-way pipeline is communicated with the air resistance device.
As a preferable technical scheme of the utility model, the needle valve is communicated with the speed-regulating flowmeter, a floating ball and a sealing O-shaped ring are arranged in the speed-regulating flowmeter, the floating ball is positioned at the bottom of the sealing O-shaped ring, and the size of the floating ball is larger than the O-shaped opening area of the sealing O-shaped ring.
As a preferable technical scheme of the utility model, a water-blocking filter device is arranged on a gas path communicated with the speed-regulating flowmeter, a hydrophobic filter membrane is arranged in the water-blocking filter device, and the water-blocking filter device is communicated with an inlet.
As a preferable technical scheme of the utility model, a heating ring is arranged around the electrochemical oxygen sensor, a platinum resistor is arranged in the heating ring, and heat preservation cotton is filled between the heating ring and the inner wall of the plastic spraying sheet metal shell.
The beneficial effects of the utility model are as follows: 1. and the interference of the ambient temperature on the oxygen concentration measurement is eliminated.
2. The abnormal fluctuation of measurement caused by the pressure transient of the sample is greatly reduced.
3. The damage condition of the sensor caused by the overhigh pressure is eliminated, and the service life of the sensor is prolonged.
4. When the pressure is suddenly excessive, the gas circuit can be automatically disconnected, and the sensor is protected from damage.
5. And the water blocking filtration is adopted to treat the oxygen, so that the accuracy of measurement is ensured.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:
FIG. 1 is a schematic structural view of an apparatus for improving measurement stability of an oxygen sensor according to the present utility model.
In the figure: 1. plastic spraying sheet metal shells; 2. an electrochemical oxygen sensor; 3. thermal insulation cotton; 4. a heating ring; 5. a temperature sensor; 6. a speed regulating flowmeter; 7. a needle valve knob; 8. a rotor; 9. a sample gas input line; 10. a sensor base; 11. a tail gas exhaust line; 12. sealing the O-shaped ring; 13. an air-blocking device; 14. a water-blocking filter device.
Detailed Description
The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.
Embodiment one: as shown in FIG. 1, the device for improving the measurement stability of the oxygen sensor comprises a sample gas conveying part, wherein the sample gas conveying part comprises a sample gas input pipeline 9, a pressure and flow control module and a temperature control module, the pressure and flow control module comprises needle valve knob 7 control, a speed regulation flowmeter 6 and a gas resistance device 13, and the temperature control module comprises a temperature sensor 5; sample gas enters through the sample gas input pipeline 9, is divided into two gas paths through the three-way pipe, one path is connected to the gas resistance device 13, and is discharged into the ambient air after passing through the gas resistance device 13, so that the sample gas can be prevented from stabilizing flow and pressure when the original gas source gas pressure is unstable (the gas pressure changes suddenly), and meanwhile, the condition that the pump is overloaded due to overlarge output resistance of the front-mounted pump is avoided. The air-blocking device 13 is a conventional structure and will not be described in detail herein.
The sample gas measuring part is arranged in the plastic spraying sheet metal shell 1 and comprises an electrochemical oxygen sensor 2, a heating ring 4 and heat preservation cotton 3, a temperature sensor 5 is also arranged in the plastic spraying sheet metal shell 1, the electrochemical oxygen sensor 2 and the temperature sensor 5 are both arranged on a sensor base 10, one end of the sensor base 10 is provided with an inlet, and the other end of the sensor base 10 is provided with an outlet;
the electrochemical oxygen sensor 2 and the temperature sensor 5 can be used for measuring the temperature and the oxygen content, wherein a measuring gas chamber is arranged in a plastic spraying sheet metal shell, the gas chamber is a cuboid cavity body with the length of 7 cm, the width of 4 cm and the height of 3 cm, the gas flow of 11+/-0.2L/Min is conveyed into the cavity body, the section of the air chamber is enlarged according to Bernoulli equation, the flow is certain, the air pressure in the air chamber is enlarged and can filter tiny air pressure fluctuation, the measuring gas chamber is communicated with the oxygen sensor, oxygen in sample gas can enter an electrode through fine holes of a PTFE film and chemically react at an electric cathode, the oxygen sensing periphery is wrapped by a heating aluminum plate, the inside of the aluminum plate is provided with platinum resistance temperature measurement, the temperature of the temperature heating temperature is accurately controlled by a solid relay in real time in a temperature controller PID control mode, the temperature is kept within 35+/-0.5 ℃, the error caused by measuring the oxygen concentration due to the inconsistency of the temperature in most use occasions is avoided, the air is accurately measured after the air is filtered, and the sample gas is discharged to the air in the sample gas through a sample gas exhaust pipeline.
And the tail gas exhaust part comprises a tail gas exhaust pipeline 11, and the tail gas exhaust pipeline 11 is communicated with the outlet. The redundant tail gas is directly communicated with the atmosphere during measurement, so that the atmospheric pressure is ensured not to change greatly.
An external vacuum pump is arranged at the input port of the sample gas input pipeline 9 in a communicated mode, and a needle valve controlled by the needle valve knob 7 is communicated with the sample gas input pipeline 9. Sample gas is conveyed by an external vacuum pump and enters a speed-regulating flowmeter 6, and the gas flow is regulated to reach the required size (normally 1+/-0.2L/Min) by a 7-speed-regulating needle valve knob.
A three-way pipeline is communicated between the sample gas input pipeline 9 and the needle valve, one gas path of the three-way pipeline is communicated with the needle valve, and the other gas path of the three-way pipeline is communicated with the air resistance device 13.
The electrochemical oxygen sensor 2 is composed of a cathode, an anode, and a filled electrolyte, and a fixed-resistance resistor is provided between the cathode and the anode. The range of the electrochemical oxygen sensor is selected from 0-25%, and the oxygen concentration in the air is about equal to 21%, so that the range can cover most of the oxygen concentration discharged after fuel oxidation and biological consumption.
The electrochemical oxygen sensor 2 is usually composed of a cathode coated with noble metals such as active catalysts of platinum, palladium, nickel and chromium, an anode composed of inert metal lead and a filled electrolyte, and currently electrochemical oxygen sensor manufacturers reduce the influence caused by pressure transient of sample gas because the pressure of the sample gas is rapidly increased or reduced to generate a transient current signal between electrodes, and then a PTFE film is added before the sample gas enters the sensor to inhibit transient of sample injection pressure, so that the influence on oxygen concentration measurement is reduced. Oxygen in the sample gas can enter the electrode through the capillary holes and chemically react at the electric cathode, and the chemical reaction formula is as follows: the generated hydroxyl ions reach the anode in the electrolyte and perform oxidation reaction with the anode, and the chemical reaction formula is as follows: the anode metal is oxidized to form current in an external circuit through the reaction, the current is positively related to the reaction speed, the reaction speed is in a proportional relation with the concentration of oxygen, and the concentration of oxygen can be calculated by measuring the voltage by arranging a fixed resistance between the two electrodes according to Faraday's law.
The reaction speed is affected by temperature, when the temperature is high, the reaction speed can be accelerated, otherwise, the speed can be reduced, and then the measurement of the oxygen concentration is affected.
The needle valve is communicated with the speed regulating flowmeter 6, a floating ball and a sealing O-shaped ring are arranged in the speed regulating flowmeter 6, the floating ball is positioned at the bottom of the sealing O-shaped ring, and the size of the floating ball is larger than the O-shaped opening area of the sealing O-shaped ring. The air flow reaches the sealing O-shaped ring after passing through the speed-regulating flowmeter 6 to indicate the floating ball, and the sealing O-shaped ring has the function that when the sample injection pressure is suddenly excessive, the floating ball can instantly push the sealing O-shaped ring to timely and automatically cut off the sample injection air flow of the path, so that the excessive pressure of the pipeline is prevented, and all sample air is discharged through the air resistance pipeline.
A water blocking filter device 14 is arranged on the air path communicated with the speed regulation flowmeter 6, a hydrophobic filter membrane is arranged in the water blocking filter device 14, and the water blocking filter device 14 is communicated with the inlet. Under normal conditions, the sample gas is conveyed to the hydrophobic filter membrane after being subjected to pressure stabilization, flow stabilization and air flow prevention, the filtering precision of the device can reach 0.22 micron after the sample gas passes through the device, most solid particles in the sample gas can be filtered, meanwhile, the filter membrane in the device has hydrophobicity, when liquid water exists in the sample gas, the membrane can block the liquid water to pass through, if accumulated liquid water causes the membrane to fail in hydrophobicity, the gas flow is blocked, and the sample gas is conveyed to a measuring gas chamber of the electrochemical oxygen sensor 2 through a sensor base inlet after passing through the device.
The electrochemical oxygen sensor 2 is provided with around the heating collar 4, and the inside of heating collar 4 is provided with platinum resistance, and is filled with heat preservation cotton 3 between heating collar 4 and the plastic spraying panel beating casing 1 inner wall, and heat preservation cotton 3 is rock wool material.
Embodiment two: the rotameter can be arranged in the speed-regulating flowmeter 6, and the rotameter can replace an O-shaped sealing ring, so that the damage of a sensor caused by the instant excessive pressure can be prevented.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (7)
1. An apparatus for improving the measurement stability of an oxygen sensor, comprising:
the sample gas conveying part comprises a sample gas input pipeline (9), a pressure and flow control module and a temperature control module, wherein the pressure and flow control module comprises needle valve knob (7) control, a speed regulation flowmeter (6) and a gas resistance device (13), and the temperature control module comprises a temperature sensor (5);
the sample gas measuring part is arranged in the plastic spraying sheet metal shell (1), the sample gas measuring part comprises an electrochemical oxygen sensor (2), a heating ring (4) and heat preservation cotton (3), the temperature sensor (5) is also arranged in the plastic spraying sheet metal shell (1), the electrochemical oxygen sensor (2) and the temperature sensor (5) are both arranged on a sensor base (10), an inlet is formed in one end of the sensor base (10), and an outlet is formed in the other end of the sensor base (10);
and the tail gas exhaust part comprises a tail gas exhaust pipeline (11), and the tail gas exhaust pipeline (11) is communicated with the outlet.
2. The device for improving the measurement stability of the oxygen sensor according to claim 1, wherein an external vacuum pump is arranged at the input port of the sample gas input pipeline (9) in a communicated manner, and a needle valve controlled by the needle valve knob (7) is communicated with the sample gas input pipeline (9).
3. The device for improving the measurement stability of an oxygen sensor according to claim 1, characterized in that the electrochemical oxygen sensor (2) is composed of a cathode, an anode and a filled electrolyte, and a fixed-value resistor is arranged between the cathode and the anode.
4. Device for improving the measurement stability of an oxygen sensor according to claim 2, characterized in that a three-way pipeline is connected between the sample gas input pipeline (9) and the needle valve, one of the three-way pipeline is connected with the needle valve, and the other of the three-way pipeline is connected with the air-blocking device (13).
5. The device for improving the measurement stability of the oxygen sensor according to claim 2, wherein the needle valve is communicated with the speed-regulating flowmeter (6), a floating ball and a sealing O-shaped ring are arranged in the speed-regulating flowmeter (6), the floating ball is positioned at the bottom of the sealing O-shaped ring, and the size of the floating ball is larger than the O-shaped opening area of the sealing O-shaped ring.
6. The device for improving the measurement stability of the oxygen sensor according to claim 5, wherein a water blocking filter device (14) is arranged on a gas path communicated with the speed regulation flowmeter (6), a hydrophobic filter membrane is arranged in the water blocking filter device (14), and the water blocking filter device (14) is communicated with an inlet of a measurement gas chamber.
7. The device for improving the measurement stability of the oxygen sensor according to claim 1, wherein a heating ring (4) is arranged around the electrochemical oxygen sensor (2), a platinum resistor is arranged in the heating ring (4), and heat preservation cotton (3) is filled between the heating ring (4) and the inner wall of the plastic spraying sheet metal shell (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322402647.4U CN220772983U (en) | 2023-09-05 | 2023-09-05 | Device for improving measurement stability of oxygen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322402647.4U CN220772983U (en) | 2023-09-05 | 2023-09-05 | Device for improving measurement stability of oxygen sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220772983U true CN220772983U (en) | 2024-04-12 |
Family
ID=90616126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322402647.4U Active CN220772983U (en) | 2023-09-05 | 2023-09-05 | Device for improving measurement stability of oxygen sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220772983U (en) |
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2023
- 2023-09-05 CN CN202322402647.4U patent/CN220772983U/en active Active
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