CN218885836U

CN218885836U - Nitrogen-oxygen sensor

Info

Publication number: CN218885836U
Application number: CN202223196697.3U
Authority: CN
Inventors: 马文岱; 王磊; 李罗申辉
Original assignee: Shanghai Hepe Electronic Technology Co ltd
Current assignee: Shanghai Hepe Electronic Technology Co ltd
Priority date: 2022-11-29
Filing date: 2022-11-29
Publication date: 2023-04-18
Anticipated expiration: 2032-11-29

Abstract

The utility model relates to a gaseous detection technology field specifically discloses a nitrogen oxygen sensor, including the sensing casing, set up first cavity and second cavity in the sensing casing, in first cavity, provide voltage in the outside of first cavity through first return circuit and make oxygen pump from first pump oxygen pipe, in the second cavity, the intensification through electric heating assembly makes and reaches the uniform temperature in the sensing casing, under this temperature, nitrogen oxide forms nitrogen gas and oxygen under catalyst coating's catalytic action, different oxygen concentration can cause the current variation in second return circuit, detect out nitrogen oxide's concentration with this, detect the oxygen volume that pumps in the second electronic flowmeter who sets up on through second pump oxygen pipe, carry out self calibration according to the nitrogen oxide concentration that oxygen volume was confirmed and the nitrogen oxide concentration that detects according to second current sensor, can calibrate the sensor precision by oneself, can in time appear being difficult for the error through the naked eye discovery at the sensor, in time, remind the maintenance.

Description

Nitrogen-oxygen sensor

Technical Field

The utility model relates to a gaseous detection technology field, in particular to nitrogen oxygen sensor.

Background

The nitrogen-oxygen sensor is made of a ceramic material based on aluminum oxide and a zirconia matrix (doped with materials such as yttrium oxide and the like), and is widely applied to detection of nitrogen oxides in tail gas of diesel vehicles due to the advantages of high temperature resistance, corrosion resistance, long service life, sensitivity to gas and the like. The detection principle is that after the temperature exceeds 300 ℃, by applying voltage on two sides of a zirconia matrix, zirconia can conduct electricity through the migration of oxygen ions, so that current is formed. In the diesel vehicle emission process, tail gas, namely gas to be detected contains nitrogen oxide, oxygen, hydrocarbon and other gases, after passing through a chamber in a nitrogen oxide sensor, oxygen in the gas to be detected can be pumped out of the nitrogen oxide sensor under the action of voltage and high temperature, the rest gas to be detected enters two chambers in the nitrogen oxide sensor, the nitrogen oxide is decomposed into oxygen and nitrogen under the action of a catalyst, the decomposed oxygen can be pumped out of the nitrogen oxide sensor again, and the concentration of the nitrogen oxide can be calculated through oxygen ion current generated when the decomposed oxygen is pumped out.

The existing nitrogen-oxygen sensor only depends on the magnitude of current to reflect the difference of nitrogen-oxygen concentration, when a circuit for detecting the current has faults or is damaged, the measurement cannot be carried out, and when a small detection error occurs, the accuracy change of the sensor cannot be directly judged only by a user according to data displayed by a display instrument.

SUMMERY OF THE UTILITY MODEL

The utility model provides a nitrogen oxygen sensor increases electronic flowmeter, detects the oxygen volume calculation nitrogen oxide concentration that pumps according to electronic flowmeter to carry out self calibration with the nitrogen oxide concentration that current concentration change detected out, can calibrate the sensor precision by oneself.

In order to solve the above problem, the utility model provides a nitrogen oxygen sensor, its technical scheme who adopts as follows:

the utility model provides a nitrogen oxygen sensor, includes sensing casing, intake pipe and outlet duct are connected to sensing casing's both sides, set up first cavity and second cavity in the sensing casing, first cavity and second cavity all adopt porous second oxidation bright solid electrolyte material to prepare and obtain, the intake pipe with first cavity is connected, first cavity passes through the intermediate tube and connects the second cavity, the second cavity is connected the outlet duct, the both sides face of first cavity sets up first film electrode and second film electrode respectively, the both sides face of second cavity sets up third film electrode and fourth film electrode respectively, first film electrode and second film electrode pass through the wire and connect and form first return circuit, third film electrode and fourth film electrode pass through the wire and connect and form the second return circuit, first cavity is connected first pump oxygen pipe, second cavity is connected the second pump oxygen pipe, set up second electron flowmeter on the second pump oxygen pipe, set up the second current sensor on the second return circuit, the inside intermediate layer that is provided with of sensing casing, be provided with the intermediate layer subassembly in the second cavity, be provided with the electric heat catalyst coating.

As a preferable technical solution, a first electronic flow meter is provided on the first pump oxygen pipe, and a first current sensor is provided on the first loop.

Preferably, the catalyst coating is a platinum coating.

Preferably, the first thin film electrode, the second thin film electrode, the third thin film electrode and the fourth thin film electrode are all platinum thin film electrodes.

As a preferred technical scheme, the electric heating component is a heating electrode.

As a preferable technical scheme, the system further comprises a controller, and signal output ends of the first electronic flowmeter, the second electronic flowmeter, the first current sensor and the second current sensor are all in signal connection with a signal input end of the controller.

The utility model has the advantages that: according to the utility model discloses a nitrogen oxygen sensor, in first cavity, provide voltage in the outside of first cavity through first return circuit and make oxygen pump out from first pump oxygen pipe, in order to avoid taking oxygen in the gas certainly to cause the influence to subsequent nitrogen oxide concentration detection, in the second cavity, intensification through electric heating assembly makes and reaches the uniform temperature in the sensing casing, under this temperature, nitrogen oxide forms nitrogen gas and oxygen under catalyst coating's catalytic action, different oxygen concentration can cause the current variation in second return circuit, detect nitrogen oxide's concentration with this, detect the oxygen amount that the second electronic flowmeter who sets up on through second pump oxygen pipe detected the oxygen volume, the nitrogen oxide concentration that confirms according to the oxygen amount carries out self-calibration with the nitrogen oxide concentration that detects according to second current sensor, can be by oneself calibrate the sensor precision, can in time appear being difficult for the error through the naked eye discovery at the sensor, in time, remind the maintenance.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 shows a block diagram of a nitrogen oxide sensor according to an embodiment of the present invention.

Fig. 2 shows a structural diagram of a nitrogen-oxygen sensor for simultaneously implementing oxygen and nitrogen oxide concentration detection functions according to an embodiment of the present invention.

Fig. 3 shows a control schematic block diagram of a nitrogen oxide sensor according to an embodiment of the present invention.

In the figure, 1 is a sensing shell, 2 is an air inlet pipe, 3 is an air outlet pipe, 4 is a first chamber, 5 is a second chamber, 6 is a middle pipe, 7 is a first thin film electrode, 8 is a second thin film electrode, 9 is a third thin film electrode, 10 is a fourth thin film electrode, 11 is a first loop, 12 is a second loop, 13 is a first pumping oxygen pipe, 14 is a second pumping oxygen pipe, 15 is a second electronic flowmeter, 16 is a second current sensor, 17 is an interlayer, 18 is an electric heating component, 19 is a catalyst coating, 20 is a first power supply electrode, 21 is a second power supply electrode, 22 is a first electronic flowmeter, 23 is a first current sensor, 24 is a controller, 25 is a central control screen, and 26 is an alarm signal lamp.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the features in the following embodiments and examples may be combined with each other without conflict.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples.

The embodiment of the utility model provides a nitrogen oxygen sensor, as shown in fig. 1, this nitrogen oxygen sensor includes sensing casing 1, intake pipe 2 and outlet duct 3 are connected to sensing casing 1's both sides, set up first cavity 4 and second cavity 5 in the sensing casing 1, first cavity 4 and second cavity 5 all adopt porous dioxidation bright white solid electrolyte material to prepare and obtain, intake pipe 2 with first cavity 4 is connected, first cavity 4 passes through intermediate pipe 6 and connects second cavity 5, second cavity 5 is connected outlet duct 3, the both sides face of first cavity 4 sets up first film electrode 7 and second film electrode 8 respectively, the both sides face of second cavity 5 sets up third film electrode 9 and fourth film electrode 10 respectively, first film electrode 7 and second film electrode 8 connect through the wire and form second return circuit 11, third film electrode 9 and fourth film electrode 10 connect through the wire and form second return circuit 12, first cavity 4 connects first pump oxygen pipe 13, second film electrode 7 connects and forms second return circuit 11 through the wire, is provided with second interlayer 15 in the second cavity 14 the electric heat pump oxygen sensor 18, is provided with the electric current sensor 17 in the second cavity 14, the electric heat is provided with the electric heat pump 15.

In the specific implementation of this embodiment, start electric heating element 18 earlier to form a temperature environment that the temperature is greater than 300 degrees centigrade at least in sensing casing 1, wait to detect later that gas enters into first chamber 4 from intake pipe 2 in, under the condition that the temperature is higher than 300 degrees centigrade, first loop 11 provides certain voltage for adopting the first chamber 4 that porous dioxemia solid electrolyte material prepared obtained, make the oxygen in waiting to detect gas pump out from first pump oxygen pipe 13, in order to get rid of the oxygen in waiting to detect gas, avoid producing the influence to the detection of follow-up nitrogen oxide concentration. The gas to be detected without oxygen enters the second chamber 5, nitrogen oxide is decomposed into nitrogen and oxygen under the catalysis of the catalyst coating 19 in a high-temperature environment, the specific temperature is determined according to different catalyst coatings 19, for example, when the catalyst coating 19 is selected to be a platinum coating, the temperature is required to reach 600 ℃, and at the moment, an electric heating component which can enable the temperature in the sensing shell 1 to reach 600 ℃ or above is selected to reach the temperature condition of catalytic reaction. After the nitrogen oxides are decomposed into nitrogen and oxygen, the oxygen is pumped out of the second chamber 5 through the second oxygen pumping pipe 14 under the voltage of the second loop 12, and the second electronic flow meter 15 can detect the corresponding oxygen amount, so that the concentration of the nitrogen oxides can be determined according to the oxygen amount. The different oxygen concentration causes a change in the current in the second circuit 12, and based on the change in current detected by the second current sensor 16, the amount of oxygen and thus the concentration of nitrogen oxides can be determined. Theoretically, under the equal normal operating's of each part of sensor the condition, should keep unanimous in certain error threshold value based on the concentration of the nitrogen oxide that second current sensor 16 and second electronic flowmeter 15 detected, compare two nitrogen oxide concentration values, can guarantee nitrogen oxygen sensor's detection precision, can in time appear at the sensor difficult error through the naked eye discovery, in time remind the maintenance.

It should be noted that the voltages of the first and

second loops

11 and 12 are supplied by a power supply, and for example only, as shown in fig. 1, a first power supply electrode 20 and a second power supply electrode 21 are provided, and a power supply (not shown) is connected to the first and second

power supply electrodes

20 and 21 to supply voltages necessary for the operation of the loops.

In a specific embodiment, as shown in fig. 2, a first electronic flow meter 22 is disposed on the first pump oxygen pipe 13, and a first current sensor 23 is disposed on the first loop 11. The first electronic flowmeter 22 and the first current sensor 23 can detect the oxygen content in the gas, that is, the nitrogen-oxygen sensor can not only detect the concentration of nitrogen oxides, but also detect the oxygen content in the gas, and at the same time, two oxygen concentration values can be obtained when detecting the oxygen content, thereby ensuring the detection accuracy of the oxygen content.

In a specific embodiment, the first thin film electrode 7, the second thin film electrode 8, the third thin film electrode 9 and the fourth thin film electrode 10 are all platinum thin film electrodes.

In a specific embodiment, the electric heating element 18 is a heating electrode, such as an electrode that can be energized to generate a high temperature, or a heating electrode that can be based on technologies such as electromagnetic radiation, infrared thermal radiation, etc., and the present embodiment is not limited thereto.

In a specific embodiment, an automatic control structure of the nitrogen oxygen sensor is provided, as shown in fig. 3, the nitrogen oxygen sensor further comprises a controller 24, and signal output ends of the first electronic flow meter 22, the second electronic flow meter 15, the first current sensor 23 and the second current sensor 16 are all in signal connection with signal input ends of the controller. In an exemplary application of the nox sensor to monitoring nox concentration in automobile exhaust, the controller 24 is selected as a chip component for calculating corresponding oxygen concentration based on respective detected electrical signals from the first electronic flow meter 22, the second electronic flow meter 15, the first current sensor 23 and the second current sensor 16, and determining nox concentration according to the oxygen concentration corresponding to the oxygen concentration fed back by the second electronic flow meter 15 and the second current sensor 16, and the determined nox concentration is fed to the central control panel 25 of the automobile by the controller 24 for display, and the user can observe the corresponding nox concentration through the central control panel. Meanwhile, the controller 24 can also be directly connected with an alarm signal lamp 26, the alarm signal lamp 26 is arranged in a cab, and the controller 24 can control the alarm signal lamp 25 to give an alarm in the self-checking process if the difference value of the concentrations of the two nitrogen oxides is not within a preset error threshold value, so as to prompt a user that the nitrogen oxygen sensor possibly has faults.

The above embodiments are only used for illustrating the present invention, and not for limiting the present invention, and those skilled in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention, so that all equivalent technical solutions also belong to the scope of the present invention, and the protection scope of the present invention should be defined by the claims.

Claims

1. The nitrogen-oxygen sensor is characterized by comprising a sensing shell, wherein an air inlet pipe and an air outlet pipe are connected to two sides of the sensing shell, a first cavity and a second cavity are arranged in the sensing shell, the first cavity and the second cavity are made of porous zinc oxide solid electrolyte materials, the air inlet pipe is connected with the first cavity, the first cavity is connected with the second cavity through a middle pipe, the second cavity is connected with the air outlet pipe, a first thin film electrode and a second thin film electrode are arranged on two side faces of the first cavity respectively, a third thin film electrode and a fourth thin film electrode are arranged on two side faces of the second cavity respectively, the first thin film electrode and the second thin film electrode are connected through wires to form a first loop, the third thin film electrode and the fourth thin film electrode are connected through wires to form a second loop, the first cavity is connected with a first pump oxygen pipe, the second cavity is connected with a second pump oxygen pipe, a second electronic flowmeter is arranged on the second loop, a second current sensor is arranged on the sensing shell, and an electric heating catalyst coating is arranged in the second cavity.

2. The nitroxide sensor of claim 1, wherein the first pump oxygen line has a first electronic flow meter disposed thereon and the first loop has a first current sensor disposed thereon.

3. The nitrogen oxygen sensor of claim 1, wherein the catalyst coating is a platinum coating.

4. The nitroxide sensor of claim 1, wherein the first thin film electrode, the second thin film electrode, the third thin film electrode, and the fourth thin film electrode are platinum thin film electrodes.

5. The nitroxide sensor of claim 1, wherein the electrical heating component is a heating electrode.

6. The nitrogen oxide sensor of claim 2, further comprising a controller, wherein the signal output ends of the first electronic flow meter, the second electronic flow meter, the first current sensor and the second current sensor are all in signal connection with the signal input end of the controller.