A gas detector detection system and detection method

Abstract

The application relates to a gas detector detection system and a detection method, which comprise a master control module, a gas sensor detection module for detecting the gas concentration, an NB wireless communication module in wireless communication with the gas sensor detection module, a relay output control module, an infrared key receiving module and an audible and visual alarm module; the gas detector detection system and the detection method are simple, the semiconductor gas sensor and the contact combustion type gas sensor can be used in cooperation according to the setting of a use scene, different modes are set according to different use scenes, after the expiration of preset timing detection time, the contact combustion type gas sensor can be automatically started during holidays or rest time, and the cooperation of the two sensors guarantees personnel safety and prolongs the service life of the sensors.

Description

Technical Field

[0001] This invention relates to the field of gas detection technology, and more specifically, to a gas detector detection system and detection method. Background Technology

[0002] With the rapid development of economy and technology, the density of urban population is constantly increasing, and the use of gas is becoming more and more widespread. As a result, incidents of combustion and explosion caused by gas leaks or poisoning due to incomplete combustion occur frequently. The current method of using dual-sensor products on the market is to first use the semiconductor sensor, and then manually activate the contact combustion gas sensor module (which is not working under normal circumstances) when the gas concentration rises, thereby extending the life of the sensor. The drawback of this method is that it cannot guarantee personnel safety in a timely manner, because the sensor requires a certain warm-up time to operate. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a gas detector detection system and detection method to address the above-mentioned deficiencies of the prior art.

[0004] On one hand, the technical solution adopted by the present invention to solve its technical problem is: a gas detector detection system, comprising a main control module, a gas sensor detection module for detecting gas concentration, an NB wireless communication module for wireless communication with the gas sensor detection module, a relay output control module, an infrared button receiving module, and an audible and visual alarm module; the gas sensor detection module, the NB wireless communication module, the relay output control module, the infrared button receiving module, and the audible and visual alarm module are all electrically connected to the main control module; the gas sensor detection module includes a semiconductor gas sensor, a contact combustion gas sensor, a switching controller for automatically turning the semiconductor gas sensor or the contact combustion gas sensor on or off, and a timing detection module connected to the switching controller; the timing detection module can be set to multiple scene modes through the NB wireless module; the switching controller switches the operation of the semiconductor gas sensor and / or the contact combustion gas sensor according to different scene modes;

[0005] The gas detector detection system of the present invention further includes an LED digital display module for displaying the concentration of a target gas, and a status LED indicator module for displaying the operating status of the semiconductor gas sensor and the contact combustion gas sensor; both the LED digital display module and the status LED indicator module are electrically connected to the main control module.

[0006] The gas detector detection system of the present invention includes a contact combustion gas sensor comprising a gas detection unit and a gas compensation unit; the gas detection unit is used to detect the presence of combustible gas and measure the concentration of combustible gas; the gas compensation unit is used to correct and compensate the measurement results of the gas detection unit.

[0007] The gas detector detection system of the present invention includes a gas compensation unit comprising a temperature compensation module, a humidity compensation module, a gas pressure compensation module, and a cross-interference compensation module.

[0008] The gas detector detection system of the present invention includes scene modes such as enterprise and education mode, factory mode, restaurant mode and residential mode.

[0009] In the gas detector detection system of the present invention, the detection cycle interval of the timing detection module can be set according to the number of days, weeks or months, and the timing parameters of the timing detection can be remotely set through the NB wireless communication module.

[0010] The gas detector detection system of the present invention includes an audible and visual alarm module comprising a buzzer and an alarm light;

[0011] In the gas detector detection system of the present invention, the first operating current of the buzzer is converted into a first output voltage through a first resistor; the first output voltage is amplified by a first amplifier and then connected to the first input pin of the main control module for sampling calculation.

[0012] In the gas detector detection system of the present invention, the second operating current of the alarm light is converted into a second output voltage through a second resistor; the second output voltage is amplified by a second amplifier and then connected to the second input pin of the main control module for sampling calculation;

[0013] On the other hand, the present invention also provides a gas detection method, using a gas detector detection system as described in any of the above descriptions, wherein the gas detection method includes the following steps:

[0014] Activate the semiconductor gas sensor and set the timing detection time corresponding to the current scenario on the timing detection module according to the usage scenario;

[0015] When the scheduled detection time is reached, the switching controller automatically activates the contact combustion gas sensor, which detects in real time whether there is a flammable gas leak in the current location. If flammable gas is detected, the audible and visual alarm module is triggered to alert the staff.

[0016] The beneficial effects of this invention are as follows: the gas detector detection system and detection method are simple, and the semiconductor gas sensor and the contact combustion gas sensor can be used together according to the setting of the usage scenario. Different modes can be set according to different usage scenarios. After the preset timed detection time expires, the contact combustion gas sensor can be automatically turned on during holidays or rest periods. The use of the two sensors together not only ensures personnel safety but also extends the service life of the sensors. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort:

[0018] Figure 1 This is a schematic diagram of the gas detector detection system according to Embodiment 1 of the present invention;

[0019] Figure 2 This is a module framework diagram of the gas sensor detection module according to Embodiment 1 of the present invention;

[0020] Figure 3 This is a module framework diagram of the contact combustion gas sensor according to Embodiment 1 of the present invention;

[0021] Figure 4 This is a circuit diagram of the main control module in Embodiment 1 of the present invention;

[0022] Figure 5 This is a partial interface circuit diagram of the main control module and the program burning process in Embodiment 1 of the present invention;

[0023] Figure 6 This is a partial circuit diagram of the main control module simulating serial communication in Embodiment 1 of the present invention;

[0024] Figure 7 This is a circuit diagram of the infrared button receiving port of Embodiment 1 of the present invention;

[0025] Figure 8 This is a circuit diagram showing the connection between the buzzer and the current detection circuit in Embodiment 1 of the present invention;

[0026] Figure 9 This is a circuit diagram showing the connection between the alarm light and the current detection circuit in Embodiment 1 of the present invention;

[0027] Figure 10 This is the self-test schedule of the timing detection module in Embodiment 1 of the present invention. Detailed Implementation

[0028] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] "Multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0031] Furthermore, the terms indicating orientation, such as "up, down, front, back, left, right, upper end, lower end, longitudinal," etc., are all based on the posture and position of the device or equipment described in this solution during normal use.

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0033] Example 1:

[0034] A gas detector detection system and detection method according to Embodiment 1 of the present invention, such as Figure 1-3As shown, the system includes a main control module 11, a gas sensor detection module 12 for detecting gas concentration, an NB wireless communication module 13 for wireless communication with the gas sensor detection module 12, a relay output control module 14, an infrared button receiving module 15, and an audible and visual alarm module 16. The gas sensor detection module 12, NB wireless communication module 13, relay output control module 14, infrared button receiving module 15, and audible and visual alarm module 16 are all electrically connected to the main control module 11. The gas sensor detection module 12 includes a semiconductor gas sensor 121, a contact combustion gas sensor 122, a switching controller 123 for automatically turning the semiconductor gas sensor 121 or the contact combustion gas sensor 122 on or off, and a timing detection module 124 connected to the switching controller 123. The timing detection module 124 can be set to various scene modes via the NB wireless module. The switching controller 123 switches the operation of the semiconductor gas sensor 121 and / or the contact combustion gas sensor 122 according to different scene modes.

[0035] The gas detector detection system and method are simple. Semiconductor gas sensors and contact combustion gas sensors can be used together according to the usage scenario. Different modes can be set according to different usage scenarios. After the preset timed detection time expires, the contact combustion gas sensor can be automatically activated during holidays or rest periods. The use of the two sensors together not only ensures personnel safety but also extends the service life of the sensors.

[0036] Among them, such as Figure 4-6 As shown, the main control module 11 uses a chip with the model number HC32F030J8TA; the NB wireless communication module 13 is a wireless communication module implemented using Narrowband Internet of Things (NB-IoT) technology, used for data communication between IoT devices and sensors. NB-IoT is a low-power wide-area network (LPWAN) technology. This hardware module integrates NB-IoT communication functions, connects to the operator's base station wirelessly via NB-IoT, and transmits relevant business data of the product to the operator's cloud platform. The cloud platform (or, if using a third-party platform, interacts with the operator's platform) analyzes and stores the data, and simultaneously transmits real-time data (alarms, faults) to the user's mobile terminal via SMS, telephone, APP, etc. This NB wireless communication module can be constructed using existing technologies.

[0037] The relay output control module 14 is an output circuit used to control the relays, enabling functions such as power switching and current control of external devices by controlling the relays' on / off states. This module includes a first relay output port (1A / 250VAC), a second relay output port (1A / 30VDC), and a 24V active output port (output during alarm). Only one of the second relay output port or the active output port can be selected; due to space limitations, selection can be controlled via remote control.

[0038] A relay is an electromagnetic device that controls the opening and closing of a switch by controlling the on / off state of its electromagnetic coil. A relay output control module controls external devices by controlling the relay's electromagnetic coil. The module's control interface can be in the form of digital signals (such as switch signals, level signals) or analog signals (such as voltage or current signals).

[0039] Figure 7 The diagram shown is the circuit schematic of the infrared key receiver port; the InfraredKey Receiver Module 15 is a module capable of receiving infrared remote control key signals. It typically consists of an infrared remote control, a decoder, and an output interface.

[0040] The infrared remote controller is the core component of this module, and it controls the detector:

[0041] a. Perform zero-point calibration on the detector.

[0042] b. Calibrate the detector

[0043] c. Can correct the detector span coefficient

[0044] d. Low concentration alarm setting value is adjustable

[0045] e. Audio-visual self-test function

[0046] f. Mute.

[0047] The audible and visual alarm module 16 includes a buzzer 161 and an alarm light 162. The audible and visual alarm module provides early warning; the gas alarm can promptly emit sound and light signals when a gas leak occurs, reminding people to take measures to prevent accidents such as fires, explosions, and poisoning.

[0048] like Figure 8The diagram shows the circuit diagram connecting the buzzer and the current detection circuit. The first operating current I of the buzzer 161 is converted into a first output voltage V1 through the first resistor R1. The first output voltage V1 is amplified by the first amplifier LMV358 and then connected to the first input pin ADC of the main control module 11 for sampling calculation. By monitoring the status of the first output voltage V1, the first operating current I, and the first input pin ADC, the current mode is determined to be normal, which can reduce maintenance costs and minimize the risk. By adding a current detection circuit to the buzzer power supply, the current consumed by the buzzer is relatively constant when the buzzer is driven to sound, given the fixed PWM drive waveform.

[0049] like Figure 9 The diagram shows the circuit diagram connecting the alarm light and the current detection circuit. The second operating current I of the alarm light 162 is converted into a second output voltage V2 through the second resistor R27. The second output voltage V2 is amplified by the second amplifier LMV358 and then connected to the second input pin ADC of the main control module 11 for sampling calculation. Similarly, by monitoring the status of the second output voltage V2, the second operating current I, and the second input pin ADC, the current mode can be judged to determine whether it is normal, which can reduce maintenance costs and reduce the degree of danger. Adding a current detection circuit to the power supply terminal of the alarm light ensures that the current consumed within a fixed period is relatively constant when the flashing frequency of the alarm light is fixed.

[0050] The normal operating current is 25mA. If the detected current is greater than 30mA or less than 20mA, the circuit is considered faulty. Simultaneously monitor the 24V voltage to ensure it remains within a 5% fluctuation range; if it is within this range, the circuit is normal.

[0051] Furthermore, the contact combustion gas sensor 122 includes a gas detection unit 1221 and a gas compensation unit 1222; the gas detection unit 1221 is used to detect the presence of combustible gas and measure the concentration of combustible gas; the gas compensation unit 1222 is used to correct and compensate the measurement results of the gas detection unit 1221.

[0052] The main function of the gas detection unit 1221 is to provide timely alarms and monitoring information by sensing the presence and concentration of combustible gases, thus helping to protect the safety and health of personnel. Its specific functions are as follows:

[0053] Gas Presence Detection: The gas detection unit can detect gases in the environment and quickly and accurately determine their presence. Selectively, by using different sensor technologies, various gases can be detected, such as combustible gases, toxic gases, methane, carbon monoxide, etc.

[0054] Gas concentration measurement: The gas detection unit can measure the concentration level of a gas and provide accurate concentration values. This is crucial for determining whether the gas concentration exceeds safety standards, especially in industrial environments, to prevent hazards such as explosions and poisoning.

[0055] Alarm activation: The gas detection unit can issue an alarm signal, such as sound, flashing light, or vibration, when the detected gas concentration exceeds a preset safety threshold. This can promptly remind personnel to take appropriate safety measures, such as evacuating the danger zone and wearing protective equipment.

[0056] Data logging and transmission: Some advanced gas detection units also have data logging and transmission capabilities, enabling them to record detected gas concentration data and transmit the data to computers or cloud platforms for analysis and monitoring. This helps in monitoring changes in gas concentration, analyzing trends, and developing appropriate measures.

[0057] By using a gas detection unit, the gas conditions in the environment can be monitored in real time, potential hazards can be detected in advance, and timely measures can be taken to protect the safety and health of personnel.

[0058] The gas compensation unit 1222 is an accessory for a gas sensor, whose main function is to correct and compensate the measurement results of the gas sensor to improve the accuracy and reliability of the measurement. In one embodiment, the gas compensation unit 1222 includes a temperature compensation module, a humidity compensation module, a pressure compensation module, and a cross-interference compensation module.

[0059] Temperature compensation module: The gas compensation unit can compensate for the temperature of the gas sensor's measurement results. Since temperature changes affect the sensor's measurement response, compensating for the temperature effect can reduce the impact of temperature on the measurement results and improve measurement accuracy.

[0060] Humidity compensation module: The gas compensation unit can compensate for humidity in the measurement results of the gas sensor. Since changes in humidity can affect the sensor's measurement response, compensating for humidity can reduce its impact on the measurement results and improve measurement accuracy.

[0061] Pressure Compensation Module: The gas compensation unit can compensate for the pressure changes in the gas sensor's measurement results. To reduce the impact of pressure variations on sensor measurements, we compensate for these pressure changes, thereby minimizing their influence and improving measurement accuracy.

[0062] Cross-interference compensation module: The gas compensation unit can compensate for cross-interference between different gases. When multiple gases are present, they may interfere with each other. By compensating for these cross-interferences, the accuracy of the measurement can be improved.

[0063] By using a gas compensation unit, the impact of environmental factors on gas sensor measurement results can be reduced, improving measurement accuracy and reliability. This is crucial for applications requiring high-precision gas measurements.

[0064] Furthermore, the gas detector detection system also includes an LED digital display module 17 for displaying the target gas concentration, and a status LED indicator module 18 for displaying the usage status of the semiconductor gas sensor 121 and the contact combustion gas sensor 122; both the LED digital display module 17 and the status LED indicator module 18 are electrically connected to the main control module 11.

[0065] Among them, the LED digital display module 17 is an LED display screen with gas concentration display function;

[0066] The status LED indicator module 18 also has three LED status indicators, with red, yellow, and green colors respectively. These three LEDs provide different indications for operation, low alarm, high alarm, fault, and network connection.

[0067] Furthermore, the scenario models include enterprise and education models, factory models, restaurant models, and residential models.

[0068] When using this technology in enterprises, primary and secondary schools, kindergartens, and other educational settings, a holiday switching mode can be set. The detector terminal has a holiday data table that can be configured (regularly set annually via the NB module). On normal working days, the contact combustion gas sensor offers high accuracy and linearity, maximizing the protection of people's lives and property. On holidays, the contact combustion gas sensor is turned off, while the semiconductor sensor is enabled. The semiconductor sensor should be preheated four hours before the contact combustion gas sensor is turned off to ensure maximum detection accuracy. This method effectively extends the lifespan of the contact combustion gas sensor, especially in primary and secondary schools and kindergartens, ensuring both personnel safety and extended sensor lifespan.

[0069] In factory mode, it can be set to work time mode and off-get off work time mode. Semiconductor sensors can be online continuously, while contact combustion gas sensors are turned on during work hours and turned off after get off work. This ensures personnel safety and extends the lifespan of the sensors.

[0070] In restaurant mode, it can be set to work hour mode and off-hour mode. The semiconductor sensor can be online continuously, while the contact combustion gas sensor is turned on during the work period and turned off after get off work. This ensures both personnel safety and extends the lifespan of the sensors.

[0071] In residential mode, it can be set to either a home arrival time mode or a departure time mode. The semiconductor sensor can remain online continuously, while the contact combustion gas sensor is activated during the home arrival time and deactivated during the departure time. This ensures both personnel safety and extends the sensor's lifespan. Detailed classification of usage scenarios ensures both personnel safety and extended sensor lifespan.

[0072] Furthermore, the detection cycle interval of the timing detection module 124 can be set by days, weeks, or months, and its timing detection time parameters can be remotely set via the NB wireless communication module 13; for example... Figure 10 The image shows the self-test schedule of the timed detection module 124. The detection cycle interval can be set by season, week, or month. The alarm time can be accurate to the minute. Detection can be performed when there are few or no people around to avoid affecting people's normal work and study.

[0073] The detection time and date of this invention can be set, allowing self-inspection to be performed during periods with few people, reducing panic caused by the sound and light of the alarm and the presence of people.

[0074] Working principle description: In clean air, the voltage balance between the detection unit and the compensation unit is 0V. When combustible gas leaks, the gas enters the sensor and interacts with the detection unit, causing the detection voltage to change—increase. This change is amplified differentially by an operational amplifier, filtered, and then output to the microcontroller for sampling. The microcontroller converts this into a concentration value, displays it, and transmits it to the controller in real time.

[0075] The usage scenario mode setting extends the sensor's lifespan; it can be set according to holidays or working hours; the settings are flexible.

[0076] The scheduled detection time can be sent to the detector locally and saved via wireless platforms such as NBiot.

[0077] Set the enable time for the dual sensors according to the detection scenario.

[0078] When the detection time is up, the local detector triggers the self-test function, the alarm light flashes, the buzzer sounds, and at the same time, it starts to check the voltage and current of the red alarm light to determine if there is a fault. If there is a fault, it reports the fault status. Then, it checks the voltage and current of the buzzer to determine if there is a fault. If there is a fault, it reports the fault status. If there is no fault, it reports the status as normal.

[0079] Example 2:

[0080] A gas detection method, employing the gas detector detection system as described in Example 1, wherein the gas detection method includes the following steps:

[0081] Start the semiconductor gas sensor 121 and set the timing detection time corresponding to the current scenario on the timing detection module 124 according to the usage scenario;

[0082] When the scheduled detection time is reached, the switch controller 123 automatically activates the contact combustion gas sensor 122. The contact combustion gas sensor 122 detects in real time whether there is a flammable gas leak in the current location. If flammable gas is detected, the audible and visual alarm module 16 is triggered to alert the staff.

[0083] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A gas detector detection system, characterized in that, The system includes a main control module, a gas sensor detection module for detecting gas concentration, an NB wireless communication module for wireless communication with the gas sensor detection module, a relay output control module, an infrared button receiving module, and an audible and visual alarm module. The gas sensor detection module, the NB wireless communication module, the relay output control module, the infrared button receiving module, and the audible and visual alarm module are all electrically connected to the main control module. The gas sensor detection module includes a semiconductor gas sensor, a contact combustion gas sensor, a switching controller for automatically turning the semiconductor gas sensor or the contact combustion gas sensor on or off, and a timing detection module connected to the switching controller. The timing detection module can be set to multiple scene modes via the NB wireless module. The switching controller switches the operation of the semiconductor gas sensor and / or the contact combustion gas sensor according to different scene modes.

2. The gas detector detection system according to claim 1, characterized in that, It also includes an LED digital display module for displaying the target gas concentration, and a status LED indicator module for displaying the usage status of the semiconductor gas sensor and the contact combustion gas sensor; both the LED digital display module and the status LED indicator module are electrically connected to the main control module.

3. The gas detector detection system according to claim 2, characterized in that, The contact combustion gas sensor includes a gas detection unit and a gas compensation unit; the gas detection unit is used to detect the presence of combustible gas and measure the concentration of combustible gas; the gas compensation unit is used to correct and compensate the measurement results of the gas detection unit.

4. The gas detector detection system according to claim 3, characterized in that, The gas compensation unit includes a temperature compensation module, a humidity compensation module, a gas pressure compensation module, and a cross-interference compensation module.

5. The gas detector detection system according to claim 4, characterized in that, The scenario modes include enterprise and education mode, factory mode, restaurant mode, and residential mode.

6. The gas detector detection system according to claim 5, characterized in that, The detection cycle interval of the timing detection module can be set by days, weeks, or months, and its timing detection time parameters can be remotely set through the NB wireless communication module.

7. The gas detector detection system according to any one of claims 1-6, characterized in that, The audible and visual alarm module includes a buzzer and an alarm light.

8. The gas detector detection system according to claim 7, characterized in that, The first operating current of the buzzer is converted into a first output voltage through a first resistor; the first output voltage is amplified by a first amplifier and then connected to the first input pin of the main control module for sampling calculation.

9. The gas detector detection system according to claim 8, characterized in that, The second operating current of the alarm light is converted into a second output voltage through a second resistor; the second output voltage is amplified by a second amplifier and then connected to the second input pin of the main control module for sampling and calculation.

10. A gas detection method, using a gas detector detection system as described in any one of claims 1-9, characterized in that, The gas detection method includes the following steps: Activate the semiconductor gas sensor and set the timing detection time corresponding to the current scenario on the timing detection module according to the usage scenario; When the scheduled detection time is reached, the switching controller automatically activates the contact combustion gas sensor, which detects in real time whether there is a flammable gas leak in the current location. If flammable gas is detected, the audible and visual alarm module is triggered to alert the staff.

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