Wearable portable sensor for n-butyl alcohol gas leakage detection

Abstract

The utility model belongs to the technical field of semiconductor oxide gas sensors, and particularly relates to a wearable portable sensor for n-butyl alcohol gas leakage detection, which comprises a display screen, a microcontroller unit, a battery and an n-butyl alcohol gas sensitive element, a microcontroller unit and a battery are sequentially arranged above the n-butyl alcohol gas sensitive element, an upper shell is arranged above the battery, a display screen is embedded in the upper shell, the upper shell is fixedly connected with a lower shell, the n-butyl alcohol gas sensitive element and the display screen are respectively connected with the microcontroller unit, and the battery is connected with the display screen, the microcontroller unit and the n-butyl alcohol gas sensitive element. The sensor disclosed by the utility model can be worn on a human body and carried at any time, is convenient for a worker in a factory to operate, can quickly and accurately detect and early warn the content of n-butyl alcohol in the air, and has the advantages of low cost, convenience in carrying and simplicity in operation.

Description

Technical Field

[0001] The utility model belongs to the technical field of semiconductor oxide gas sensors, in particular to a wearable portable sensor for n-butanol gas leakage detection. Background Art

[0002] With the rapid development of modern society, plastic products have increased dramatically, and industrial waste gases (VOCs, etc.) in the plastic manufacturing process have seriously endangered the environment and human life and health. n-Butanol, as one of the raw materials for plastics, is widely used in food, electronic devices, and the construction industry. However, leakage of n-Butanol gas can cause huge and irreversible damage to the human body, such as dizziness, headaches, red and swollen eyes, respiratory system inhibition, and damage to the central nervous system. Therefore, in industrial environments, it is very important to promptly detect whether the concentration of n-Butanol gas exceeds the human body's acceptable threshold. Existing n-Butanol gas detection devices on the market are divided into fixed or handheld types, which are large in size and inconvenient to carry, making it inconvenient for operators to detect different positions. At the same time, the sensing performance of the sensor will decline after a period of use. Finally, the sensors in such large-volume sensing devices are generally welded on circuit boards, which are more troublesome to replace, making it difficult to accurately and quickly detect the concentration of n-Butanol gas, and detection accuracy and efficiency are all reduced. Utility Model Content

[0003] In response to the shortcomings of the existing technology, the example of the utility model provides a wearable portable sensor for n-butanol gas leakage detection, which can be worn on the body and accurately and quickly detect the concentration of n-butanol gas in the air. It is low-cost, easy to carry and simple to operate.

[0004] A wearable portable sensor for n-butanol gas leak detection comprises a display screen, a microcontroller unit, a battery, and an n-butanol gas sensor. The n-butanol gas sensor is fixed inside a lower housing. The microcontroller unit and the battery are sequentially arranged above the n-butanol gas sensor. An upper housing is arranged above the battery, and a display screen is embedded in the upper housing. The upper housing is fixedly connected to the lower housing. The n-butanol gas sensor and the display screen are respectively connected to the microcontroller unit. The battery is connected to the display screen, the microcontroller unit, and the n-butanol gas sensor.

[0005] The n-butanol gas sensor includes a sensor and an insulating base. The sensor is fixed on the insulating base, and the insulating base is fixed inside the lower shell. The sensor includes an Al2O3 ceramic plate. Gold electrodes are provided at both ends of the Al2O3 ceramic plate. A ruthenium oxide heating layer is provided on the lower surface of the Al2O3 ceramic plate, and a gas-sensitive material film is provided on the upper surface.

[0006] The middle position of the bottom of the sensor is provided with four pins, the top of the insulating base is provided with four elastic conductive sockets matched with the pins, and the elastic conductive sockets of the insulating base are connected to the battery.

[0007] The microcontroller unit is provided with a buzzer.

[0008] A buckle is provided on the bottom of the lower shell.

[0009] The four corners of the insulating base are provided with mounting holes, and bolts pass through the mounting holes to fix the insulating base on the lower shell.

[0010] The beneficial effects of the utility model are as follows:

[0011] 1. The sensor of the utility model can be worn on the human body and carried at any time, which is convenient for factory workers to operate. At the same time, it can quickly and accurately detect and warn the content of n-butanol in the air. It has the advantages of low cost, easy to carry and simple operation.

[0012] 2. The n-butanol gas sensor of the present invention includes a sensor and an insulating base. The sensor is connected to the elastic conductive jack on the top of the insulating base through the bottom pin to achieve the installation of the n-butanol gas sensor. When the sensor fails or is damaged, the sensor can be directly removed for easy replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of a wearable portable sensor for n-butanol gas leakage detection in the utility model;

[0014] Figure 2 This is a top view of an n-butanol gas sensitive element in a wearable portable sensor for n-butanol gas leakage detection according to the present invention;

[0015] Figure 3 This is a bottom view of an n-butanol gas sensitive element in a wearable portable sensor for n-butanol gas leakage detection according to the present invention;

[0016] Icons: 1. Display screen; 2. Microcontroller unit; 3. Battery; 4. n-Butanol gas sensor; 41. Sensor; 411. Al2O3 ceramic plate; 412. Gold electrode; 42. Insulating base; 421. Elastic conductive jack; 422. Mounting hole; 5. Upper housing; 6. Lower housing; 7. Clip; 8. Buzzer. DETAILED DESCRIPTION

[0017] The present invention is described in detail below with reference to the accompanying drawings.

[0018] like Figure 1-3As shown, a wearable portable sensor for n-butanol gas leakage detection includes a display screen 1, a microcontroller unit 2, a battery 3, and an n-butanol gas sensor 4. The n-butanol gas sensor 4 is fixed inside a lower housing 6. The microcontroller unit 2 and the battery 3 are sequentially arranged above the n-butanol gas sensor 4. An upper housing 5 is arranged above the battery 3, and a display screen 1 is embedded in the upper housing 5. The upper housing 5 is fixedly connected to the lower housing 6. The n-butanol gas sensor 4 and the display screen 1 are respectively connected to the microcontroller unit 2. In this embodiment, the n-butanol gas sensor 4 is connected to the microcontroller unit 2 via a wire, and the data collected by the n-butanol gas sensor 4 is transmitted to the microcontroller unit 2 through a signal output channel. The display screen 1 receives and displays the signal sent by the microcontroller unit 2; the microcontroller unit 2 is provided with a buzzer 8. When the n-butanol content exceeds the standard, the buzzer 8 is activated for early warning; the battery 3 is connected to the display screen 1, the microcontroller unit 2, and the n-butanol gas sensor 4, and the battery 3 supplies power to the display screen 1, the microcontroller unit 2, and the n-butanol gas sensor 4.

[0019] The n-butanol gas sensor 4 includes a sensor 41 and an insulating base 42. The sensor 41 is fixed on the insulating base 42. The four corners of the insulating base 42 are provided with mounting holes 422. Bolts pass through the mounting holes 422 to fix the insulating base 42 to the inside of the lower shell 6. The sensor 41 includes an Al2O3 ceramic plate 411. Gold electrodes 412 are provided at both ends of the Al2O3 ceramic plate 411. A ruthenium oxide heating layer is provided on the lower surface of the Al2O3 ceramic plate 411, and a gas-sensitive material film is provided on the upper surface. The ruthenium oxide heating layer is on the side of the insulating base 42, and the gas-sensitive material film is on the side of the microcontroller unit 2. The gas concentration is detected by changing the semiconductor resistance of the Al2O3 ceramic plate 411. This method has high detection accuracy, low cost, and low energy consumption.

[0020] The gas-sensitive material film is a mixture of Ag-doped ZnO gas-sensitive material and a small amount of anhydrous ethanol, which is shaken to form a mixture. The mixture is then coated on an Al2O3 ceramic plate using a pipette to form a gas-sensitive material film of uniform thickness. After heat treatment, the film is packaged and aged, and then made into a gas sensor together with the Al2O3 ceramic plate, gold electrode 412, and ruthenium oxide heating layer. The depletion layer model is one of the most widely used frameworks to explain the gas sensing mechanism of metal oxides. Gas molecules react chemically with the zinc oxide surface, and charge transfer occurs between the two, resulting in a significant change in the resistance of zinc oxide. For pure zinc oxide sensors, when in contact with air, a layer of oxygen molecules will adhere to the zinc oxide surface, thereby capturing a certain number of free electrons, which are then ionized. With the formation of the depletion layer on the zinc oxide surface, the carrier concentration decreases, and the zinc oxide sensor shows a very high resistance. When the pure ZnO sensor is exposed to n-butanol gas, the n-butanol molecules will react with the O 2-The ions undergo a chemical reaction. Ultimately, the charge transferred to the gas molecules is released back into the zinc oxide, reducing the resistance of the zinc oxide sensor. Therefore, under certain voltage conditions, the change in the gas sensor's resistance can be calculated from the change in the circuit current, thereby determining the n-butanol gas concentration.

[0021] The sensor 41 is provided with four pins in the middle position, and the insulating base 42 is provided with four elastic conductive sockets 421 matching the pins. The elastic conductive sockets 421 of the insulating base 42 are connected to the battery. If the sensor 41 is worn or damaged after a period of use, it can be directly removed for replacement.

[0022] A buckle 7 is provided at the bottom of the lower shell 6, which can be clipped on clothes or connected to a watch strap and worn on the hand. It can quickly and accurately detect the concentration of n-butanol without affecting the workers' production work. Once a leakage occurs, an alarm can be issued in time to avoid casualties.

[0023] The detection principle of this utility model is:

[0024] When air contacts the n-butanol gas sensor 4, the n-butanol content in the air is detected in real time by the n-butanol gas sensor 4. The detected n-butanol content analog signal is converted into a digital signal and then output to the microcontroller unit 2. The microcontroller unit 2 pre-sets a normal n-butanol content value. After receiving the n-butanol content digital signal, the numerical value of the n-butanol content digital signal is compared with the preset normal n-butanol content value to determine whether the n-butanol content exceeds the standard. The n-butanol content digital signal and the comparison result are then output to the display 1, which displays the real-time n-butanol gas concentration on the screen. If the n-butanol concentration exceeds the threshold, a buzzer 8 will sound an alarm. The device can be worn on a person and carried at any time, making it convenient for factory workers to operate. It can quickly and accurately detect and warn the n-butanol content in the air. It has the advantages of low cost, portability, and simple operation.

[0025] After receiving the analog signal from sensor 41, the microcontroller unit 2 performs analog-to-digital conversion and compares it with a given value to determine the current n-butanol gas concentration in the air and whether it exceeds a threshold. Display 1 can monitor the n-butanol gas concentration in real time. If the concentration exceeds the threshold, an alarm is sounded, prompting staff to evacuate promptly.

Claims

1. A wearable portable sensor for n-butanol gas leakage detection, characterized in that: The invention comprises a display screen, a microcontroller unit, a battery, and an n-butanol gas sensor. The n-butanol gas sensor is fixed inside a lower shell. The microcontroller unit and the battery are arranged in sequence above the n-butanol gas sensor. An upper shell is arranged above the battery. A display screen is embedded in the upper shell. The upper shell is fixedly connected to the lower shell. The n-butanol gas sensor and the display screen are respectively connected to the microcontroller unit. The battery is connected to the display screen, the microcontroller unit, and the n-butanol gas sensor.

2. A wearable portable sensor for n-butanol gas leakage detection according to claim 1, characterized in that: The n-butanol gas sensor includes a sensor and an insulating base. The sensor is fixed on the insulating base, and the insulating base is fixed inside the lower shell. The sensor includes an Al2O3 ceramic plate. Gold electrodes are provided at both ends of the Al2O3 ceramic plate. A ruthenium oxide heating layer is provided on the lower surface of the Al2O3 ceramic plate, and a gas-sensitive material film is provided on the upper surface.

3. A wearable portable sensor for n-butanol gas leakage detection according to claim 2, characterized in that: The middle position of the bottom of the sensor is provided with four pins, the top of the insulating base is provided with four elastic conductive sockets matched with the pins, and the elastic conductive sockets of the insulating base are connected to the battery.

4. A wearable portable sensor for n-butanol gas leakage detection according to claim 1, characterized in that: The microcontroller unit is provided with a buzzer.

5. The wearable portable sensor for n-butanol gas leakage detection according to claim 1, characterized in that: A buckle is provided on the bottom of the lower shell.

6. A wearable portable sensor for n-butanol gas leakage detection according to claim 2, characterized in that: The four corners of the insulating base are provided with mounting holes, and bolts pass through the mounting holes to fix the insulating base on the lower shell.

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