Combustible gas detection system for valve well and underground confined space

Abstract

The utility model provides a valve well and underground confined space combustible gas detection system, a power supply module comprises a power supply circuit and a battery pack module, the battery pack module comprises a plurality of lithium batteries and lithium ion capacitors which are connected in parallel, and the power supply module supplies power to the detection system. The leakage sensing module comprises a laser leakage sensor, a first boosting module and a first UART communication module, the laser leakage sensor comprises a laser driving circuit, a laser, a measuring gas chamber, a detector and a lock-in amplifier which are arranged in sequence, and the Bluetooth communication module comprises a Bluetooth module, a voltage reduction module and a second UART communication module. The wireless communication module comprises an LTE-Cat1 communication module, a second boosting module and a third UART communication module; the gas sensor adopting the laser spectrum has the characteristics of high precision, high sensitivity, long service life and stable performance, adopts a temperature compensation algorithm, is not interfered by a use environment, and can stably work under a severe working condition and a complex gas environment.

Description

Technical Field

[0001] This utility model relates to the field of coupling installation technology, specifically to a combustible gas detection system for valve wells and underground enclosed spaces. Background Technology

[0002] Combustible gas detection devices for valve wells and underground confined spaces mainly include laser leak sensors and liquid level sensors, which can meet the requirements of space gas concentration detection and water level measurement. In the existing technology, laser leak sensors usually use chemical sensors and power batteries for power supply. The chemical sensors condition the gas samples, which usually includes filtering out impurities and interfering gases, drying or cooling the instrument display part. However, chemical sensors are easily affected by environmental interference and are not suitable for stable operation in the harsh working conditions and complex gas environments of valve wells and underground confined spaces. Power batteries have a large reaction area due to their wound structure and are suitable for high current discharge, but their safety is poor when used in valve wells and underground confined spaces. Utility Model Content

[0003] The purpose of this invention is to provide a combustible gas detection system for valve wells and underground enclosed spaces.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A combustible gas detection system for valve wells and underground confined spaces includes an MCU controller, a leak sensing module, a liquid level sensor, a power supply module, a Bluetooth communication module, a Hall sensor detection module, a wireless communication module, and an external memory. The power supply module includes a power supply circuit and a battery pack module, which includes several lithium batteries and lithium-ion capacitors connected in parallel. The power supply module supplies power to the detection system. The leak sensing module, liquid level sensor, Bluetooth communication module, Hall sensor detection module, wireless communication module, and external memory are all communicatively connected to the MCU controller. The leak sensing module includes a laser leak sensor, a first boost module, and a first UART communication module. The laser leak sensor includes a laser driving circuit, a laser, a measuring gas chamber, a detector, and a phase-locked amplifier arranged sequentially. The Bluetooth communication module includes a Bluetooth module, a buck module, and a second UART communication module. The wireless communication module includes an LTE-Cat1 communication module, a second boost module, and a third UART communication module.

[0006] Furthermore, both the first boost module and the second boost module include a synchronous boost converter, the switching pin and the input pin of which are connected to the negative terminal of the first Schottky diode.

[0007] Furthermore, the Hall sensor detection module includes a rotor, a magnet, and a Hall sensor. The magnet and the Hall sensor work together, and the signal output terminal of the Hall sensor is connected to the MCU controller through an NPN transistor.

[0008] Furthermore, each of the lithium batteries is connected in series with a second Schottky diode, and the positive terminal of the lithium ion is connected to the positive terminal of the second Schottky diode.

[0009] This utility model uses a gas sensor with laser spectroscopy, which features high precision, high sensitivity, long life and stable performance. It uses a temperature compensation algorithm, is not affected by the operating environment, and can work stably in harsh working conditions and complex gas environments.

[0010] This invention uses an energy-type battery that can be made into a carbon-coated structure, has a small reaction area, is suitable for low-current discharge, and has good battery safety performance. Attached Figure Description

[0011] Figure 1 This is a system structure diagram of the present invention;

[0012] Figure 2 This is a system structure diagram of the laser leakage sensor of this utility model;

[0013] Figure 3 This is a circuit diagram of the boost module of this utility model;

[0014] Figure 4 This is a circuit diagram of the Hall sensor detection module of this utility model;

[0015] Figure 5 This is a circuit diagram of the battery pack module of this utility model.

[0016] Figure label:

[0017] 1. MCU controller, 2. Laser leakage sensor, 3. First boost module,

[0018] 4. First UART communication module; 5. Liquid level sensor; 6. Power supply circuit.

[0019] 7. Battery pack module, 8. Hall sensor detection module, 9. Bluetooth module,

[0020] 10. Step-down module, 11. Second UART communication module, 12. LTE-Cat1 communication module

[0021] 13 Second boost module, 14 Third UART communication module, 15 External memory,

[0022] 21 Laser drive circuit, 22 Laser, 23 Measuring gas chamber, 24 Detector,

[0023] 25 Lock-in Amplifier

[0024] 71 Lithium batteries, 72 Lithium-ion capacitors

[0025] 81 Rotor, 82 Magnet, 83 Hall Sensor

[0026] U1 synchronous boost converter. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] This utility model discloses a combustible gas detection system for valve wells and underground confined spaces, such as Figure 1 As shown, it includes an MCU controller 1, a leakage sensing module, a liquid level sensor 5, a power supply module, a Bluetooth communication module, a Hall sensor detection module 8, a wireless communication module, and an external memory 15. The power supply module includes a power supply circuit 6 and a battery pack module 7.

[0029] The leakage sensing module, liquid level sensor 5, Bluetooth communication module, Hall sensor detection module 8, wireless communication module and external memory 15 are all connected to the MCU controller 1.

[0030] The Bluetooth communication module includes a Bluetooth module 9, a buck module 10, and a second UART communication module 11. The wireless communication module includes an LTE-Cat1 communication module 12, a second boost module 13, and a third UART communication module 14.

[0031] The leakage sensing module includes a laser leakage sensor 2, a first boost module 3, and a first UART communication module 4, such as... Figure 2 As shown, the laser leakage sensor 2 includes a laser driving circuit 21, a laser 22, a measuring gas chamber 23, a detector 24, and a lock-in amplifier 25 arranged in sequence. The laser source emits laser light of a specific wavelength. With the modulation of the injected periodic current, the wavelength changes periodically. By scanning the wavelength, the laser 22 outputs the absorption spectrum line of the gas to be measured with the center wavelength as the absorption wavelength. The concentration of the gas to be measured is inferred from the spectral intensity signal information obtained after gas absorption.

[0032] The laser leakage sensor 2 operates at a stable voltage of 5V. The battery voltage is 3.6V and needs to be boosted to 5V by a boost module. Based on the laser leakage sensor 2's operating current of 50mA and sleep current of 2mA, the design must consider power-off. Therefore, a boost module that can be enabled to turn off is selected. After the laser leakage sensor 2 finishes acquiring data, the boost module is turned off by the MCU controller 1.

[0033] like Figure 3 As shown, the first boost module 3 includes a synchronous boost converter U1, which uses an ETA1061V50S2G. The switch pin and input pin of the synchronous boost converter are connected to the negative terminal of the first Schottky diode D1. The output level of the laser sensor is TTL level, which can be directly connected to the serial port of the MCU controller 1. The MCU controller 1 only reads the data of the laser leakage sensor 2, and there is no problem of switching between 5V and 3.3V levels. It can be used directly for differentiation.

[0034] like Figure 4 As shown, the Hall sensor detection module 8 includes a rotor 81, a magnet 82, and a Hall sensor 83. The magnet 82 and the Hall sensor 83 work together. The signal output terminal of the Hall sensor 83 is connected to the MCU controller 1 through an NPN transistor Q1. The NPN transistor Q1 is a 2N3904.

[0035] The technical parameters of battery module 7 are as follows: open circuit voltage (25℃): ≥3.65V; nominal capacity: 114Ah; maximum continuous discharge current: 1500mA; maximum pulse discharge current: 2400mA; operating temperature: -55℃~+85℃; battery life: 2 years (5 minutes of data acquisition, 2 hours of data transmission).

[0036] Battery module 7 serves as the main power supply system for the combustible gas detection device in the valve well and underground confined space. It must consider not only the operating current of each functional module but also the maximum current at startup. For example, the instantaneous startup current of the LTE-CAT1 wireless communication module 12 can reach 2A. Therefore, a single lithium battery is unlikely to provide sufficient energy. The design employs multiple lithium batteries connected in parallel to increase battery capacity and instantaneous output energy. Considering the safety of mutual charging between lithium batteries, a diode is added to each lithium battery to prevent backflow. A parallel connection of single lithium batteries is used, such as... Figure 5 As shown, the battery module 7 includes seven parallel lithium batteries 71 and one lithium-ion capacitor 72. The lithium batteries are SPC1550 and the lithium-ion capacitor 72 is ER34615. Each lithium battery 71 is connected in series with a second Schottky diode D2. The second Schottky diode D2 is 1N5822. The positive terminal of the lithium battery 71 is connected to the positive terminal of the second Schottky diode D2.

[0037] This utility model discloses that the working modes of the combustible gas detection system are divided into status indication mode, detection mode, configuration mode, firmware upgrade mode, and sleep mode, and the working modes of each mode are as follows;

[0038] Status indication mode: Enters every 10 seconds. Once entered, the status indicator lights output according to the status of liquid level sensor 5 and laser leak sensor 2 (normal - green, alarm - red, fault - red).

[0039] Detection mode: Enters every 5 minutes. After entering, it detects the laser leakage sensor 2 and the liquid level sensor 5. If the status or concentration value changes or the upload cycle is reached (default 2 hours), it will trigger an upload. Otherwise, it will enter sleep mode.

[0040] Configuration Mode: The magnetic sealed space intelligent leakage alarm enters configuration mode after 3 seconds. In this mode, it can communicate with the pipeline well configuration tool (PC or Android APP) to adjust parameters and test the sealed space intelligent leakage alarm.

[0041] Firmware upgrade mode: Enters every 24 hours. After entering this mode, the terminal actively queries the server for a new firmware version. If a new firmware version is available, it updates the firmware and automatically restarts after the update is complete. If no firmware is available, it enters sleep mode.

[0042] Sleep mode: Low power mode.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A combustible gas detection system for valve wells and underground confined spaces, characterized in that, The system includes an MCU controller, a leakage sensing module, a liquid level sensor, a power supply module, a Bluetooth communication module, a Hall sensor detection module, a wireless communication module, and an external memory. The power supply module includes a power supply circuit and a battery pack module, which includes several lithium batteries and lithium-ion capacitors connected in parallel. The power supply module supplies power to the detection system. The leakage sensing module, liquid level sensor, Bluetooth communication module, Hall sensor detection module, wireless communication module, and external memory are all communicatively connected to the MCU controller. The leakage sensing module includes a laser leakage sensor, a first boost module, and a first UART communication module. The laser leakage sensor includes a laser driving circuit, a laser, a measuring gas chamber, a detector, and a lock-in amplifier arranged sequentially. The Bluetooth communication module includes a Bluetooth module, a buck module, and a second UART communication module. The wireless communication module includes an LTE-Cat1 communication module, a second boost module, and a third UART communication module.

2. The gas detection system according to claim 1, characterized in that, Both the first boost module and the second boost module include a synchronous boost converter, wherein the switching pin and the input pin of the synchronous boost converter are connected to the negative terminal of the first Schottky diode.

3. The gas detection system according to claim 1, characterized in that, The Hall sensor detection module includes a rotor, a magnet, and a Hall sensor. The magnet and the Hall sensor work together, and the signal output terminal of the Hall sensor is connected to the MCU controller through an NPN transistor.

4. The gas detection system according to claim 1, characterized in that, Each of the lithium batteries is connected in series with a second Schottky diode, and the positive terminal of the lithium ion is connected to the positive terminal of the second Schottky diode.

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