Vanadium oxide nanotube gas sensor

Abstract

The utility model discloses a vanadium oxide nanotube gas sensor which comprises a base, a gas detection mechanism is arranged above the base, the gas detection mechanism comprises a tubular base body, a gas sensitive layer is fixedly sleeved outside the base body, a heating wire is arranged inside the base body, and the heating wire is spiral. Vanadium oxide is made into the vanadium oxide nanotube to be matched with the tubular base body, so that the sensitivity of the sensor can be improved, the working temperature can be reduced, the size of the sensor can be reduced, and the sensor can work normally in a low-temperature environment.

Description

Technical Field

[0001] The utility model relates to the technical field of gas sensitive sensors, in particular to a vanadium oxide nanotube gas sensitive sensor. Background Art

[0002] Gas sensors are sensors used to detect gas concentration and composition. They play an extremely important role in environmental protection and safety supervision.

[0003] However, the core parts of existing gas sensors mostly use tin oxide as the detection material, but tin oxide has a low sensitivity response value and cannot quickly react chemically with the gas in the air. In addition, gas sensors are used when exposed to gases of various components. Since the temperature and humidity at the detection site vary greatly and there is a large amount of dust and oil mist, the working conditions are relatively harsh, and the dust in the gas will adhere to the surface of the component, causing its performance to deteriorate.

[0004] Therefore, it is necessary to propose a vanadium oxide nanotube gas sensor to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a vanadium oxide nanotube gas sensor to solve the problem that tin oxide has a low sensitivity response value and cannot quickly produce a chemical reaction with the gas in the air.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a vanadium oxide nanotube gas sensor, comprising a base, a gas detection mechanism is arranged on the top of the base, the gas detection mechanism comprises a substrate, the substrate is tubular, a gas sensitive layer is arranged on the outer fixed sleeve of the substrate, and a heating wire is arranged inside the substrate, and the heating wire is spiral.

[0007] Preferably, an electrode is fixedly provided on the top of the base, four electrodes are provided and distributed in a circle, and a platinum wire is fixedly connected to one end of the electrode close to the substrate.

[0008] Preferably, two of the platinum wires are fixedly connected to two ends of the heating wire respectively, and the other two platinum wires are fixedly connected to the substrate respectively.

[0009] Preferably, a wire mesh cover is movably mounted on the top of the base, a pressure ring is movably sleeved on the wire mesh cover, and the pressure ring is fixedly mounted on the base.

[0010] Preferably, a circuit board is provided below the base, the electrode is fixedly penetrated through the circuit board, and a resonator is fixedly mounted on the circuit board.

[0011] Preferably, a conductive cover is provided above the resonator, an elastic steel wire is fixedly installed on the bottom of the conductive cover, and the elastic steel wire is fixedly connected to the circuit board.

[0012] Preferably, the elastic steel wire is spiral-shaped, two elastic steel wires are provided, and the two elastic steel wires are distributed in a mirror-image manner.

[0013] Preferably, vibration steel wires are fixedly mounted on both sides of the conductive cover, the vibration steel wires are arc-shaped, and one end of the vibration steel wire away from the conductive cover is attached to the wire mesh cover.

[0014] The technical effect of the utility model is that: by manufacturing vanadium oxide into vanadium oxide nanotubes and cooperating with a tubular matrix, the sensitivity of the sensor can be improved, the operating temperature can be reduced, and the size of the sensor can be reduced, so that the sensor can work normally in a low temperature environment; resonance is generated by the resonator, so that dust attached to the surface of the component can be cleaned under harsh working conditions, thereby improving the service life of the gas sensor and the accuracy of the data. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the vanadium oxide nanotube gas sensor of the utility model.

[0016] Figure 2 This is a schematic diagram of the gas-sensitive layer, electrode and platinum wire structure of the utility model.

[0017] Figure 3 This is a cross-sectional view of the structure of the vanadium oxide nanotube gas sensor of the utility model.

[0018] Figure 4 For this utility model Figure 3 A magnified view of the structure in the middle.

[0019] In the figure: 1. base; 2. pressure ring; 3. wire mesh cover; 4. electrode; 5. circuit board; 6. resonator; 7. conductive cover; 8. elastic steel wire; 9. vibration steel wire; 10. substrate; 11. platinum wire; 12. gas sensitive layer; 13. heating wire. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] like Figure 1-Figure 4As shown, the utility model provides a vanadium oxide nanotube gas sensor, including a base 1, the base 1 is used to install components required for detecting gas, an electrode 4 is fixedly penetrated on the top of the base 1, the electrode 4 is used to provide power required for gas detection and signal transmission, a wire mesh cover 3 is movably installed on the top of the base 1, the wire mesh cover 3 is used to prevent dust from entering the base 1, a pressure ring 2 is movably sleeved on the wire mesh cover 3, the pressure ring 2 is used to fix the wire mesh cover 3, and the pressure ring 2 is fixedly installed on the base 1.

[0022] Specifically, a gas detection mechanism is arranged above the base 1, and the gas detection mechanism includes a substrate 10. The substrate 10 is used to support and fix the gas sensitive layer 12, transmit electrical signals and provide a heating environment. The substrate 10 can be made of ceramic material, but is not limited to ceramic material. The gas sensitive layer 12 is fixedly mounted on the outside of the substrate 10, and the gas sensitive layer 12 is used to chemically react with some specific gases in the air.

[0023] Taking into account the fact that tin oxide has a low sensitivity response value and cannot quickly react chemically with gases in the air, the gas-sensitive layer 12 can be made of vanadium oxide material, but is not limited to vanadium oxide material. Vanadium oxide material has the characteristics of high sensitivity, rapid response and high stability, and vanadium oxide is easy to be manufactured into vanadium oxide nanotubes to cooperate with the tubular matrix 10, thereby improving the sensitivity of the sensor, reducing the operating temperature, and reducing the size of the sensor, so that the sensor can work normally even in a low temperature environment.

[0024] The substrate 10 is tubular, and the tubular structure has a larger surface area and better thermal stability, which helps the gas to fully contact the gas sensitive layer 12, improves the accuracy of the detection results, and can better withstand these temperature changes when the gas contacts the gas sensitive layer 12, reduces thermal stress and prevents damage to the substrate 10.

[0025] A heating wire 13 is arranged inside the substrate 10 , and the heating wire 13 is used to accelerate the adsorption and redox reaction of the measured gas, thereby improving the sensitivity and response speed of the sensor. The heating wire 13 is spiral-shaped, and the spiral structure can better dissipate heat evenly to the surface of the tubular substrate 10 .

[0026] Furthermore, four electrodes 4 are provided, and the four electrodes 4 are distributed in a circle. A platinum wire 11 is fixedly connected to one end of the electrode 4 close to the substrate 10. The platinum wire 11 is used to measure the resistance change and transfer the power required for heating the heating wire 13. The platinum wire 11 cooperates with the substrate 10. By measuring the change in the resistance value of the platinum wire 11, the type and concentration of the gas can be inferred. Two of the platinum wires 11 are fixedly connected to the two ends of the heating wire 13 respectively, and the other two platinum wires 11 are fixedly connected to the substrate 10 respectively.

[0027] During specific operation, the gas-sensitive layer 12 undergoes a chemical reaction with some specific gases in the air, causing the conductive properties of the substrate 10 to change and the resistance value on the platinum wire 11 to change. The concentration of specific gases in the environment is determined by measuring the change in resistance value, thereby realizing the detection of the concentration of specific gases in the air.

[0028] A circuit board 5 is provided below the base 1 . The circuit board 5 is used to install a gas sensor to transmit the gas signal detected by the gas sensor to an external circuit or control system. The electrode 4 is fixedly penetrated on the circuit board 5 .

[0029] Considering that the working conditions of the gas sensor are relatively bad and the dust in the gas will adhere to the surface of the component, making its performance deteriorate, a resonator 6 is fixedly mounted on the circuit board 5, and the resonator 6 is used to provide vibration.

[0030] It should be noted that the resonator 6 is an electronic component that generates a resonant frequency in the prior art. Commonly used resonators 6 are made of quartz crystal and ceramic materials. When the frequency of the external electrical signal is the same as the natural frequency of the resonator 6, a resonance phenomenon will occur, causing the electromagnetic wave energy inside the resonator 6 to continuously accumulate, ultimately achieving a resonant amplification effect, which will not be elaborated here.

[0031] Furthermore, a conductive cover 7 is provided above the resonator 6, and the conductive cover 7 is used to transmit the vibration generated by the resonator 6. An elastic steel wire 8 is fixedly installed at the bottom of the conductive cover 7, and the elastic steel wire 8 is used to fix the conductive cover 7. The elastic steel wire 8 is fixedly connected to the circuit board 5. The elastic steel wire 8 is spiral-shaped, and the spiral structure can effectively absorb and release energy. Two elastic steel wires 8 are provided, and the two elastic steel wires 8 are distributed in a mirror image.

[0032] Vibration steel wires 9 are fixedly installed on both sides of the conductive cover 7. The vibration steel wires 9 are used to transfer the vibration generated by the resonator 6 to the wire mesh cover 3, so that the dust attached to the wire mesh cover 3 falls off. The vibration steel wires 9 are arc-shaped, and the arc-shaped structure can fit more closely on the wire mesh cover 3, thereby transferring the vibration generated by the resonator 6 to the wire mesh cover 3. The end of the vibration steel wire 9 away from the conductive cover 7 fits on the wire mesh cover 3.

[0033] During specific operation, when the gas sensor transmits the detected gas concentration information to the external circuit, the frequency of the electrical signal generated is the same as the frequency of the resonator 6 (it should be noted that the resonator 6 can select a resonator 6 of a corresponding frequency according to the frequency of the electrical signal emitted by the gas sensor when transmitting the gas information, which will not be elaborated here), so that the resonator 6 resonates, and the vibration generated by the resonator 6 is transmitted to the wire mesh cover 3, shaking off the dust on the wire mesh cover 3, thereby realizing the cleaning of dust attached to the surface of the component under harsh working conditions, thereby improving the service life of the gas sensor and the accuracy of the data.

Claims

1. A vanadium oxide nanotube gas sensor, characterized in that: The invention comprises a base (1), a gas detection mechanism is arranged on the top of the base (1), the gas detection mechanism comprises a base (10), the base (10) is tubular, a gas-sensitive layer (12) is arranged on the outer fixed sleeve of the base (10), and a heating wire (13) is arranged inside the base (10), and the heating wire (13) is spiral.

2. The vanadium oxide nanotube gas sensor according to claim 1, characterized in that: An electrode (4) is fixedly provided on the top of the base (1), four electrodes (4) are provided, and the four electrodes (4) are distributed in a circumference, and a platinum wire (11) is fixedly connected to one end of the electrode (4) close to the substrate (10).

3. The vanadium oxide nanotube gas sensor according to claim 2, characterized in that: Two of the platinum wires (11) are respectively fixedly connected to two ends of the heating wire (13), and the other two platinum wires (11) are respectively fixedly connected to the substrate (10).

4. The vanadium oxide nanotube gas sensor according to claim 1, characterized in that: A wire mesh cover (3) is movably mounted on the top of the base (1), a pressure ring (2) is movably sleeved on the wire mesh cover (3), and the pressure ring (2) is fixedly mounted on the base (1).

5. The vanadium oxide nanotube gas sensor according to claim 2, characterized in that: A circuit board (5) is arranged below the base (1), the electrode (4) is fixedly penetrated on the circuit board (5), and a resonator (6) is fixedly mounted on the circuit board (5).

6. The vanadium oxide nanotube gas sensor according to claim 5, characterized in that: A conductive cover (7) is arranged above the resonator (6), an elastic steel wire (8) is fixedly installed on the bottom of the conductive cover (7), and the elastic steel wire (8) is fixedly connected to the circuit board (5).

7. The vanadium oxide nanotube gas sensor according to claim 6, characterized in that: The elastic steel wire (8) is spiral-shaped, two elastic steel wires (8) are provided, and the two elastic steel wires (8) are distributed in a mirror-image manner.

8. The vanadium oxide nanotube gas sensor according to claim 6, characterized in that: Vibrating steel wires (9) are fixedly mounted on both sides of the conductive cover (7). The vibrating steel wires (9) are arc-shaped, and one end of the vibrating steel wires (9) away from the conductive cover (7) is attached to the steel mesh cover (3).

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