Gas probe device

Abstract

The utility model belongs to the technical field of gas measurement, and particularly discloses a gas probe device which comprises a shell, the shell is composed of a bottom cover and an upper cover, a first gas hole is formed in the bottom of the bottom cover, a first fixing plate and a second fixing plate are arranged in the shell, a gas sensor is fixedly arranged on the first fixing plate and located above the first gas hole, and the second fixing plate is located above the second gas hole. A turbofan is mounted on the second fixing plate, a circuit board is arranged between the first fixing plate and the second fixing plate, and a second air hole is formed in the first fixing plate; the gas sensor on the circuit board is connected with the signal processing module, the signal processing module is connected with the analog-to-digital conversion module, the analog-to-digital conversion module is connected with the control module, the control module is in communication connection with the communication module, the control module is connected with the motor driving module, and the motor driving module is electrically connected with the turbofan. According to the utility model, the problems of large output signal fluctuation and large temperature excursion of the gas sensor and the problem of higher base value can be solved. The gas monitoring device is suitable for gas monitoring.

Description

TECHNICAL FIELD

[0001] The utility model belongs to gas measurement technical field, concretely is a kind of gas probe device. BACKGROUND

[0002] Gas probe, i.e. gas monitoring probe, is commonly used to detect whether explosive gas, toxic and harmful gas is over standard.Currently, common gas probe is usually composed of gas sensor and related circuit, just simply converts the output of gas sensor into digital quantity collection, while gas sensor works normally to generate certain temperature, so that the temperature inside gas probe cannot be kept in fixed interval, further resulting in the problems of large signal fluctuation and large temperature drift of gas probe detected, and the problem of high bottom value, i.e. without target gas, higher value is also outputted. CONTENT OF UTILITY MODEL

[0003] The utility model aims at providing a kind of gas probe device, can alleviate the problems of large signal fluctuation and large temperature drift of gas sensor output, and the problem of high bottom value.

[0004] The utility model employs the following technical method to achieve the above-mentioned purpose:

[0005] A kind of gas probe device, including shell, shell is composed of bottom cover and upper cover, first gas hole is set in the bottom of bottom cover, first fixed plate and second fixed plate are arranged in the inside of shell, gas sensor is fixed on first fixed plate, gas sensor is located above first gas hole, turbine fan is installed on second fixed plate, circuit board is arranged between first fixed plate and second fixed plate, one end of circuit board is fixedly installed first fixed plate, the other end of circuit board is fixedly installed on second fixed plate, second gas hole is set in first fixed plate;Signal processing module, analog-digital conversion module, control module, motor drive module and communication module are included on circuit board, the output end of gas sensor is connected with the input end of signal processing module, the output end of signal processing module is connected with the input end of analog-digital conversion module, the output end of analog-digital conversion module is connected with the input end of control module, control module is connected with communication module, the signal output end of control module is connected with the signal input end of motor drive module, the signal output end of motor drive module is electrically connected with the motor of turbine fan.

[0006] As a limitation: the signal processing module includes an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a voltage reference chip, the positive input end of the operational amplifier is connected with one end of the first resistor, the other end of the first resistor is connected with the cathode end of the voltage reference chip, the reference end of the voltage reference chip and one end of the second resistor respectively, the anode end of the voltage reference chip is grounded, the other end of the second resistor and the power positive end of the operational amplifier are connected with a power supply; the inverting input end of the operational amplifier is connected with one end of the third resistor, the other end of the third resistor is connected with one end of the fourth resistor, one end of the fifth resistor and the second signal output end of the gas sensor respectively, the other end of the fifth resistor is connected with the first signal output end of the gas sensor and the output end of the operational amplifier respectively, the power negative end of the operational amplifier is grounded; the first signal output end of the gas sensor is also connected with the first signal input end of the analog-digital conversion module, and the second signal output end of the gas sensor is also connected with the second signal input end of the analog-digital conversion module.

[0007] As a further limitation: the operational amplifier signal is LMV321ISN3T1G, and the voltage reference chip model is TL432.

[0008] As another limitation: the chip model of the analog-digital conversion module is ADS1110A0IDBVR.

[0009] As a further limitation: the communication module adopts RS485 communication, and the communication module includes a communication chip, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor, the control module is connected with the communication chip through serial communication, the serial sending pin of the control module is connected with one end of the sixth resistor and the signal input pin of the communication chip respectively, the serial receiving pin of the control module is connected with one end of the seventh resistor and the signal input pin of the communication chip respectively, the other end of the sixth resistor and the other end of the seventh resistor are connected with a power supply, the RS485 enabling pin of the control module is connected with the enabling pin of the communication chip and one end of the eighth resistor respectively, the other end of the eighth resistor is grounded, the A pin of the communication chip is connected with one end of the ninth resistor and the A line of the RS485 bus respectively, the B pin of the communication chip is connected with one end of the tenth resistor and the B line of the RS485 bus respectively, the other end of the ninth resistor is connected with a power supply, and the other end of the tenth resistor is grounded.

[0010] The utility model discloses a gas sensor, which has the advantages that the gas sensor has the functions of signal processing, communication and control, and the communication and control functions are realized through the communication module and the control module, so that the gas sensor can be connected with a computer or a mobile phone, and the gas sensor can be controlled and monitored through the computer or the mobile phone.

[0011] This utility model provides a gas probe device that, by incorporating a gas sensor, a signal processing module, an analog-to-digital converter (ADC), a control module, and a communication module, can detect gases in the environment. The signal processing module plays a role in stabilizing, leveling, and amplifying the signal. By setting a third, fourth, and fifth resistor, the problem of a high threshold value is alleviated, enabling more accurate acquisition of the gas sensor's output signal. This signal is then converted into an amplified voltage signal and transmitted to the ADC module for conversion into a digital signal. A turbine fan rotates at a fixed speed, and airflow enters the probe through a first air vent, then is expelled by the turbine fan. The gas flow carries away the heat generated by the gas sensor, preventing [heat buildup]. Sudden changes in the internal temperature of the gas probe maintain a constant internal temperature, mitigating the problems of large fluctuations and temperature drift in the gas sensor output signal. By setting up a communication module, the signal acquisition of the gas probe is separated from the gas monitoring host, and the signal from the gas probe is transmitted to the monitoring equipment through the communication module. This effectively reduces the interface burden of the gas monitoring host, enabling rapid response to gas changes and improving the response speed of gas monitoring. The use of digital communication converts analog signals into digital signals, effectively solving the distortion and aberration of analog signals during transmission. At the same time, digital communication has strong scalability, facilitating future expansion.

[0012] This invention is applicable to gas monitoring. Attached Figure Description

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 This is a schematic diagram of the structure of a gas probe device according to an embodiment of the present invention;

[0015] Figure 2 This is a structural block diagram of a gas probe device according to an embodiment of the present invention;

[0016] Figure 3 This is a circuit diagram of the signal processing module in an embodiment of the present invention;

[0017] Figure 4 This is a circuit diagram of the analog-to-digital conversion module according to an embodiment of the present invention;

[0018] Figure 5 This is a circuit diagram of the communication module in an embodiment of the present invention;

[0019] In the diagram: 1. Top cover; 2. Bottom cover; 3. First vent; 4. First fixing plate; 5. Second fixing plate; 6. Gas sensor; 7. Second vent; 8. Turbine fan; 9. Circuit board. Detailed Implementation

[0020] The utility model will be further described below in conjunction with examples, but those skilled in the art should understand that the utility model is not limited to the following examples, and any improvement and equivalent change made on the basis of the specific examples of the utility model are within the scope of protection of the utility model claims.

[0021] A gas probe device

[0022] A gas probe device, as Figure 1 shown, comprises a shell composed of a bottom cover 2 and an upper cover 1, the bottom cover 2 is provided with a first air hole 3 at the bottom, a first fixed plate 4 and a second fixed plate 5 are arranged inside the shell, a gas sensor 6 is fixed on the first fixed plate 4, the gas sensor 6 is located above the first air hole 3, and a turbine fan 8 is installed on the second fixed plate 5; a circuit board 9 is arranged between the first fixed plate 4 and the second fixed plate 5, one end of the circuit board 9 is fixedly installed on the first fixed plate 4, the other end of the circuit board 9 is fixedly installed on the second fixed plate 5, and a second air hole 7 is formed on the first fixed plate 4; the circuit board 9 comprises a signal processing module, an analog-to-digital conversion module, a control module, a motor driving module and a communication module, as Figure 2 shown, the output end of the gas sensor 6 is connected with the input end of the signal processing module, the output end of the signal processing module is connected with the input end of the analog-to-digital conversion module, the output end of the analog-to-digital conversion module is connected with the input end of the control module, the control module is in communication connection with the communication module, the signal output end of the control module is connected with the signal input end of the motor driving module, the signal output end of the motor driving module is electrically connected with the motor of the turbine fan 8, the control module adopts a single-chip microcomputer, and the motor driving module adopts a conventional motor driving circuit.

[0023] As Figure 3 shown, the signal processing module comprises an operational amplifier U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a voltage reference chip, the positive input end of the operational amplifier U1 is connected with one end of the first resistor R1, the other end of the first resistor R1 is connected with the cathode end of the voltage reference chip, the reference end of the voltage reference chip and one end of the second resistor R2 respectively, the anode end of the voltage reference chip is grounded, and the other end of the second resistor R2 and the power supply positive end of the operational amplifier U1 are connected with a power supply; the inverting input end of the operational amplifier U1 is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with one end of the fourth resistor R4, one end of the fifth resistor R5 and the second signal output end ADS_IN- of the gas sensor respectively, the other end of the fifth resistor R5 is connected with the first signal output end ADS_IN+ of the gas sensor and the output end of the operational amplifier U1 respectively, and the power supply negative end of the operational amplifier U1 is grounded. In the embodiment, the signal of the operational amplifier U1 is LMV321ISN3T1G, and the model of the voltage reference chip is TL432.

[0024] As Figure 4 shown, the chip model of the analog-digital conversion module of the embodiment is ADS1110A0IDBVR, the control module is connected with the analog-digital conversion module through IIC bus, the SCL pin of the analog-digital conversion module is connected with the SCL pin of the control module, the SDA pin of the analog-digital conversion module is connected with the SDA pin of the control module, the VIN+ pin of the analog-digital conversion module is connected with the first signal output end ADS_IN+ of the gas sensor, and the VIN- pin of the analog-digital conversion module is connected with the second signal output end ADS_IN- of the gas sensor. As Figure 5 shown, the communication module adopts RS485 communication, and the communication module includes a communication chip, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor. The communication chip model is CS48505D, and the control module is connected with the communication module through serial communication. The serial transmission pin USART1_TX of the control module is connected with one end of the sixth resistor R6 and the signal input pin DI of the communication chip respectively, the serial receiving pin USART1_RX of the control module is connected with one end of the seventh resistor R7 and the signal input pin RO of the communication chip respectively, the other end of the sixth resistor R6 and the other end of the seventh resistor R7 are connected with a power supply, the RS485 enable pin RS485_EN of the control module is connected with the enable pin REB, DE of the communication chip and one end of the eighth resistor R8 respectively, the other end of the eighth resistor R8 is grounded, the A pin of the communication chip is connected with one end of the ninth resistor R9 and the A line of the RS485 bus respectively, the B pin of the communication chip is connected with one end of the tenth resistor R10 and the B line of the RS485 bus respectively, the other end of the ninth resistor R9 is connected with the power supply, the other end of the tenth resistor R10 is grounded, and a capacitor is connected between the power supply and the ground.

[0025] In the working process of the gas probe device, the single-chip microcomputer controls the motor driving module to work, and then controls the motor to drive the turbine fan 8 to rotate, so as to suck the gas into the gas probe device. The gas sensor 6 detects the gas in the environment, and the signal processing module processes the detected signal to stabilize, level and amplify. By setting the third resistor R3, the fourth resistor R4 and the fifth resistor R5, the influence of the high bottom value is slowed down, the output signal of the gas sensor 6 can be obtained more accurately, and the output signal is converted into an amplified voltage signal, and then transmitted to the analog-to-digital conversion module to be converted into a digital signal. The digital signal is transmitted to the single-chip microcomputer, and then transmitted to the monitoring equipment through the communication module. In the working process of the gas sensor, the gas sensor itself generates a certain temperature. In the embodiment, the turbine fan 8 rotates at a fixed speed, the airflow enters the probe through the first gas hole 3, and then the turbine fan 8 discharges the gas. The flow of the gas carries away the temperature generated by the gas sensor 6, avoids the sudden change of the temperature in the gas probe, maintains the constant temperature in the gas probe device, and solves the problems of large fluctuation and large temperature drift of the output signal of the gas sensor.

Claims

1. A gas probe device, characterized by The application relates to a gas sensor, which comprises a shell composed of a bottom cover and an upper cover, a first air hole is arranged at the bottom of the bottom cover, a first fixing plate and a second fixing plate are arranged in the shell, a gas sensor is fixedly arranged on the first fixing plate and located above the first air hole, a turbine fan is arranged on the second fixing plate, a circuit board is arranged between the first fixing plate and the second fixing plate, one end of the circuit board is fixedly arranged on the first fixing plate, the other end of the circuit board is fixedly arranged on the second fixing plate, and a second air hole is arranged on the first fixing plate; the circuit board comprises a signal processing module, an analog-digital conversion module, a control module, a motor driving module and a communication module, the output end of the gas sensor is connected with the input end of the signal processing module, the output end of the signal processing module is connected with the input end of the analog-digital conversion module, the output end of the analog-digital conversion module is connected with the input end of the control module, the control module is in communication connection with the communication module, the signal output end of the control module is connected with the signal input end of the motor driving module, and the signal output end of the motor driving module is electrically connected with the motor of the turbine fan.

2. A gas probe apparatus according to claim 1, wherein The signal processing module comprises an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a voltage reference chip, the positive input end of the operational amplifier is connected with one end of the first resistor, the other end of the first resistor is connected with the cathode end of the voltage reference chip, the reference end of the voltage reference chip and one end of the second resistor respectively, the anode end of the voltage reference chip is grounded, and the other end of the second resistor and the power positive end of the operational amplifier are connected with a power supply; the inverting input end of the operational amplifier is connected with one end of the third resistor, the other end of the third resistor is connected with one end of the fourth resistor, one end of the fifth resistor and the second signal output end of the gas sensor respectively, the other end of the fifth resistor is connected with the first signal output end of the gas sensor and the output end of the operational amplifier respectively, and the power negative end of the operational amplifier is grounded; the first signal output end of the gas sensor is also connected with the first signal input end of the analog-digital conversion module, and the second signal output end of the gas sensor is also connected with the second signal input end of the analog-digital conversion module.

3. A gas probe apparatus according to claim 2, wherein The operational amplifier signal is LMV321ISN3T1G, and the voltage reference chip model is TL432.

4. A gas probe device according to any one of claims 1-3, characterized in that The chip model of the analog-digital conversion module is ADS1110A0IDBVR.

5. A gas probe device according to any one of claims 1-3, characterized in that The communication module adopts RS485 communication, and the communication module comprises a communication chip, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor. The control module is connected with the communication chip through serial communication. The serial sending pin of the control module is connected with one end of the sixth resistor and the signal input pin of the communication chip. The serial receiving pin of the control module is connected with one end of the seventh resistor and the signal input pin of the communication chip. The other end of the sixth resistor and the other end of the seventh resistor are connected with a power supply. The RS485 enable pin of the control module is connected with the enable pin of the communication chip and one end of the eighth resistor. The other end of the eighth resistor is grounded. The A pin of the communication chip is connected with one end of the ninth resistor and the A line of the RS485 bus. The B pin of the communication chip is connected with one end of the tenth resistor and the B line of the RS485 bus. The other end of the ninth resistor is connected with the power supply. The other end of the tenth resistor is grounded. A capacitor is connected between the power supply and the ground.

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