Combustible gas collecting device with digital zero setting function

Abstract

The utility model discloses a combustible gas collecting device with digital zero setting, which comprises an MCU (Microprogrammed Control Unit) module, a sensor, a gas leakage collecting circuit and a battery, the sensor is connected with the gas leakage collecting circuit, the gas leakage collecting circuit is connected with the MCU module, and the battery supplies power to the combustible gas collecting device with digital zero setting; the gas leakage acquisition circuit comprises a digital potentiometer, a comparator and an operational amplifier; the MCU module is connected with the input end of the digital potentiometer, the output end of the digital potentiometer is connected with the first differential input end of the comparator, and the sensor is connected with the second differential input end of the comparator; the first input end of the operational amplifier is connected with the MCU module, and the first output end of the operational amplifier provides reference voltage for the comparator. The utility model provides a combustible gas collecting device with digital zero setting, which can realize automatic zero setting and collecting functions.

Description

Technical Field

[0001] The utility model relates to a combustible gas collection device with digital zero adjustment, belonging to the technical field of gas monitoring. Background Art

[0002] The gas industry is currently experiencing rapid growth nationwide, with liquefied petroleum gas, natural gas, coal-to-gas, and other fuels widely used as clean energy sources in industry and commerce. As a new energy source, its widespread adoption and application has undoubtedly played a significant role in improving urban environmental quality. However, with its widespread use, these gases can pose health risks, be explosive, and pose numerous potential safety hazards if misused or leaked. Failure to promptly detect and address gas leaks can lead to catastrophic harm to society and residents, increasing urban insecurity and instability. This necessitates the development of detectors that are easy to use and accurate to ensure personal, industrial, and property safety, while also being simple to maintain and facilitate timely identification and resolution of faults.

[0003] Existing catalytic combustion combustible gas detectors are prone to errors over time, with inaccurate data collection. Their status cannot be determined during maintenance, and zero calibration often fails due to improper operation and unmet conditions, resulting in abnormal data collection. Frequent on-site maintenance is required, which is costly and inconvenient. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a combustible gas collection device with digital zero adjustment, which can realize automatic zero adjustment and collection functions.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A combustible gas collection device with digital zeroing, comprising an MCU module, a sensor, a gas leakage collection circuit, and a battery. The sensor is connected to the gas leakage collection circuit, which is connected to the MCU module. The battery supplies power to the combustible gas collection device with digital zeroing.

[0007] The gas leakage acquisition circuit includes a digital potentiometer, a comparator and an operational amplifier;

[0008] The MCU module is connected to the input end of the digital potentiometer, the output end of the digital potentiometer is connected to the first differential input end of the comparator, and the sensor is connected to the second differential input end of the comparator;

[0009] The first input terminal of the operational amplifier is connected to the MCU module, and the first output terminal of the operational amplifier provides a reference voltage for the comparator;

[0010] The output end of the comparator is connected to the second input end of the operational amplifier, and the second output end of the operational amplifier is connected to the MCU module.

[0011] Furthermore, it also includes an MCU reference voltage module, which is connected to the MCU module and is used to provide the MCU module with a reference voltage for ADC conversion.

[0012] Furthermore, it also includes an external communication module, which is connected to the MCU module and is used for the MCU module to communicate with external devices.

[0013] Furthermore, it also includes a first power supply module, which is used to supply power to the MCU module, the MCU reference voltage module, the operational amplifier and the external communication module.

[0014] Furthermore, it also includes a second power supply module, which is used to supply power to the gas leakage collection circuit.

[0015] Furthermore, the second power supply module includes a power switch circuit, a potentiometer power supply circuit and a comparator power supply circuit. The input end of the power switch circuit is connected to the battery, and the output end of the power switch circuit is respectively connected to the input end of the potentiometer power supply circuit and the input end of the comparator power supply circuit. The output end of the potentiometer power supply circuit powers the digital potentiometer, and the output end of the comparator power supply circuit powers the comparator.

[0016] Using the above technical solution, the present invention uses an MCU to adjust the output signal via a digital potentiometer, completing automatic zero calibration and data acquisition functions. It can also accurately determine whether the detector reading is abnormal. Intermittently collecting leaked gas reduces battery consumption and extends the life of the collection device. This device boasts high data acquisition accuracy, simplicity, practicality, and low maintenance costs, easily meeting user needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a principle block diagram of a combustible gas collection device with digital zeroing according to the present utility model;

[0018] Figure 2 This is a circuit diagram of the MCU module of the present utility model;

[0019] Figure 3 This is a circuit diagram of the MCU reference voltage module of the present utility model;

[0020] Figure 4 This is a circuit diagram of the first voltage module of the present invention;

[0021] Figure 5 This is a circuit diagram of the second voltage module of the present invention;

[0022] Figure 6 This is a circuit schematic diagram of the gas leakage collection circuit of the present utility model;

[0023] Figure 7 This is a circuit diagram of the external communication module of the present utility model. DETAILED DESCRIPTION

[0024] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0025] like Figure 1 As shown, this embodiment provides a combustible gas sampling device with digital zeroing. The device includes an MCU module, a sensor, a gas leakage sampling circuit, and a battery. The sensor is connected to the gas leakage sampling circuit, which is in turn connected to the MCU module. The battery provides power for the combustible gas sampling device with digital zeroing. The sensor senses leaked gas, which is sampled and processed by the gas leakage sampling circuit and then output to the MCU module, which reads the combustible gas concentration.

[0026] like Figure 2 As shown, the MCU module IC1 of this embodiment uses the chip STM8L151C8, which uses the Y1 high-speed crystal oscillator circuit to ensure a high operating speed and response frequency. It is equipped with a programming configuration port J1 to facilitate the update of embedded programs. Figure 1 As shown in FIG, the MCU reference voltage module is connected to the MCU module, and the MCU reference voltage module is used to provide the MCU module with a reference voltage for ADC conversion. Figure 3 As shown, in the MCU reference voltage circuit, the power chip U3 converts the 3.3V voltage into a 2.5V voltage, which is connected to pin 12 of the MCU module as the ADC conversion reference voltage of the MCU module.

[0027] like Figure 6 As shown, the gas leakage acquisition circuit of this embodiment includes a digital potentiometer U7, a comparator U1 and an operational amplifier U2.

[0028] The MCU module is connected to the input end of the digital potentiometer U7, the output end of the digital potentiometer U7 is connected to the first differential input end of the comparator U1, and the sensor is connected to the second differential input end of the comparator U1.

[0029] A first input terminal of the operational amplifier U2 is connected to the MCU module, and a first output terminal of the operational amplifier U2 provides a reference voltage for the comparator U1.

[0030] The output end of the comparator U1 is connected to the second input end of the operational amplifier U2, and the second output end of the operational amplifier U2 is connected to the MCU module.

[0031] When detecting leaked gas concentration, the MCU module adjusts digital potentiometer U7 via commands, causing it to output a corresponding detection signal to pin 2 of comparator U1. Simultaneously, the signal collected by the sensor is transmitted to pin 3 of comparator U1 via terminal J2. The signals at pins 2 and 3 of comparator U1 are then compared to generate a differential signal, which is then amplified by a fixed factor. Pin 32 of the MCU module then sends a high level to pin 3 of operational amplifier U2. Pin 1 of operational amplifier U2 then transmits a reference voltage to pin 5 of comparator U1. After the amplified differential signal from comparator U1 is compared with the reference voltage, the output value is transmitted to pin 5 of operational amplifier U2. Operational amplifier U2 processes this signal and outputs signal ADC1 to pin 7 of the MCU module, thus obtaining the leaked gas concentration value.

[0032] During zero calibration, the sensor is directly exposed to air without ventilation. The MCU module automatically adjusts the resistance of digital potentiometer U7 through instructions, changing the signal difference between pins 2 and 3 of comparator U1, returning the value read by the acquisition device to 0, completing the zero calibration. After successful calibration, the acquisition device can accurately collect gas concentrations. When the MCU module provides a high level as a reference voltage to operational amplifier U2, if the detector is abnormal, the feedback voltage decreases compared to the reference voltage, accurately determining whether the detector is experiencing negative drift.

[0033] like Figure 1 As shown, the combustible gas sampling device with digital zeroing in this embodiment further includes an external communication module, which is connected to the MCU module and is used for the MCU module to communicate with external devices. Figure 7 As shown, the external communication module adopts RS485 communication. The MCU module communicates with the host computer or other external devices through the external communication module. The model of RS485 chip U4 is SN65HVD75DR.

[0034] like Figure 1 As shown, the combustible gas sampling device with digital zeroing in this embodiment further includes a first power supply module, which is used to supply power to the MCU module, the MCU reference voltage module and the external communication module. Figure 4 As shown, the first power supply module uses a power conversion chip V1, model HT7333-3, which converts the 7.2V voltage of the battery into a 3.3V voltage for use by the MCU module, MCU reference voltage module, operational amplifier U2 and external communication module.

[0035] like Figure 1As shown, the combustible gas collection device with digital zeroing in this embodiment further includes a second power supply module, which is used to supply power to the gas leakage collection circuit.

[0036] Among them, the second power supply module includes a power switch circuit, a potentiometer power supply circuit and a comparator power supply circuit. The input end of the power switch circuit is connected to the battery, and the output end of the power switch circuit is respectively connected to the input end of the potentiometer power supply circuit and the input end of the comparator power supply circuit. The output end of the potentiometer power supply circuit supplies power to the digital potentiometer, and the output end of the comparator power supply circuit supplies power to the comparator U1.

[0037] like Figure 5 As shown, the power switch circuit consists of transistor Q2 and MOS transistor chip U8. The 7.2V battery voltage passes through transistor Q2 and MOS transistor chip U8 to control the back-end power supply on and off. The base of transistor Q2 is connected to pin 26 of the MCU module. When the MCU module sends a high level, MOS transistor chip U8 turns on, outputting a voltage of 7.2V1. This voltage then flows through the DCDC power chip U6 in the potentiometer power supply circuit to output a 2.7V voltage to power potentiometer U7. The voltage of 7.2V1 passes through the LDO chip V2 to output a 5V voltage for comparator U1. This ensures a safer and more stable power supply without interference.

[0038] Because the system is battery-powered, this embodiment uses intermittent gas leakage collection to minimize battery consumption. When collection is required, the host computer sends a collection command to the MCU module. The MCU module turns on the power switch circuit, supplies power to potentiometer U7 and comparator U1, and begins collecting gas leaks. After collection is complete, the host computer sends a sleep command to the MCU module, which turns off the power switch circuit and ceases collection.

[0039] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A combustible gas sampling device with digital zeroing, characterized by: It includes an MCU module, a sensor, a gas leakage collection circuit and a battery. The sensor is connected to the gas leakage collection circuit, the gas leakage collection circuit is connected to the MCU module, and the battery supplies power to the combustible gas collection device with digital zeroing. The gas leakage acquisition circuit includes a digital potentiometer, a comparator and an operational amplifier; The MCU module is connected to the input end of the digital potentiometer, the output end of the digital potentiometer is connected to the first differential input end of the comparator, and the sensor is connected to the second differential input end of the comparator; The first input terminal of the operational amplifier is connected to the MCU module, and the first output terminal of the operational amplifier provides a reference voltage for the comparator; The output end of the comparator is connected to the second input end of the operational amplifier, and the second output end of the operational amplifier is connected to the MCU module.

2. The combustible gas sampling device with digital zeroing according to claim 1, characterized in that: It also includes an MCU reference voltage module, which is connected to the MCU module and is used to provide the MCU module with a reference voltage for ADC conversion.

3. The combustible gas sampling device with digital zeroing according to claim 2, characterized in that: It also includes an external communication module, which is connected to the MCU module and is used for the MCU module to communicate with external devices.

4. The combustible gas sampling device with digital zeroing according to claim 3 is characterized in that: It also includes a first power supply module, which is used to supply power to the MCU module, the MCU reference voltage module, the operational amplifier and the external communication module.

5. The combustible gas sampling device with digital zeroing according to claim 1, characterized in that: It also includes a second power supply module, which is used to supply power to the gas leakage collection circuit.

6. The combustible gas sampling device with digital zeroing according to claim 5, characterized in that: The second power supply module includes a power switch circuit, a potentiometer power supply circuit and a comparator power supply circuit. The input end of the power switch circuit is connected to the battery, and the output end of the power switch circuit is respectively connected to the input end of the potentiometer power supply circuit and the input end of the comparator power supply circuit. The output end of the potentiometer power supply circuit supplies power to the digital potentiometer, and the output end of the comparator power supply circuit supplies power to the comparator.

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